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You searched for subject:(microscope). Showing records 1 – 30 of 782 total matches.
National University of Singapore (23)
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Anna University (11)
1. Ashwin K. Studies on pseudomonas aeruginosa Biofilms;.
Degree: Studies on pseudomonas aeruginosa Biofilms, 2015, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/39220
Biofilms are aggregates of microorganisms embedded in a matrix newlineof extracellular polysaccharides They are formed due to the colonization of newlinesurfaces by bacterial cells There… (more)
Biofilms are aggregates of microorganisms embedded in a matrix newlineof extracellular polysaccharides They are formed due to the colonization of newlinesurfaces by bacterial cells There is a need to study the factors that are crucial newlinefor biofilm formation because they have been known to cause failure of newlineimplants and also heavy losses in food dairy oil and paper industries Earlier newlinestudies on bacterial adhesion and biofilm formation involved the use of cell newlinecounting, staining or confocal microscopy techniques Atomic Force newlineMicroscopy provides another alternative since it can be used to study the newlineadhesion force of biofilms newlineThe Atomic Force Microscope was created to address the newlinelimitations of Scanning Tunnelling Microscope since the Scanning Tunnelling newlineMicroscope could only be used for imaging conductive samples in vacuum newlineIt also scores over other techniques like Scanning Electron Microscope since newlineit can be operated in air or fluid environments rather than in vacuum This newlineallows the study of biological samples in conditions close to their newlinephysiological state newlinePorous Silicon was discovered by Uhlir when he was trying to newlinedevelop an electrochemical method to machine silicon wafers Since then newlinePorous Silicon has been fabricated by electrolytically etching crystalline newlinesilicon using aqueous or non aqueous electrolytes containing hydrofluoric newlineacid newline
appendix p73-119, reference p120-137.
Advisors/Committee Members: Ramalingam S.
Subjects/Keywords: Atomic Force Microscope; Scanning Electron Microscope
K, A. (2015). Studies on pseudomonas aeruginosa Biofilms; . (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/39220
K, Ashwin. "Studies on pseudomonas aeruginosa Biofilms;." 2015. Thesis, Anna University. Accessed July 18, 2019. http://shodhganga.inflibnet.ac.in/handle/10603/39220.
K, Ashwin. "Studies on pseudomonas aeruginosa Biofilms;." 2015. Web. 18 Jul 2019.
K A. Studies on pseudomonas aeruginosa Biofilms;. [Internet] [Thesis]. Anna University; 2015. [cited 2019 Jul 18]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/39220.
K A. Studies on pseudomonas aeruginosa Biofilms;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/39220
2. Hjeltström, Anna. Copper minerals under the microscope.
Degree: Earth Sciences, 2015, Uppsala University
► From many perspectives copper is a very important metal for the modern society. It can be found in everything from jewellery to electronics. For… (more)
▼ From many perspectives copper is a very important metal for the modern society. It can be found in everything from jewellery to electronics. For this reason it is very important for geologists to be able to develop efficient methods for identification, characterisation, extraction and processing of copper. One method for the identification of copper bearing minerals is ore microscopy which has been used in this paper along with a general introduction. Samples from the study collection of the Department of Earth Sciences and the area of Långban and Månhöjden have been examined, documented and described in detail. The thesis begins with an introduction to the history and geochemistry of copper along with some ore forming processes.
Subjects/Keywords: Copper; Minerals; Microscope
Hjeltström, A. (2015). Copper minerals under the microscope . (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243049
Hjeltström, Anna. "Copper minerals under the microscope." 2015. Thesis, Uppsala University. Accessed July 18, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243049.
Hjeltström, Anna. "Copper minerals under the microscope." 2015. Web. 18 Jul 2019.
Hjeltström A. Copper minerals under the microscope. [Internet] [Thesis]. Uppsala University; 2015. [cited 2019 Jul 18]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243049.
Hjeltström A. Copper minerals under the microscope. [Thesis]. Uppsala University; 2015. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243049
3. Obrebski, J.W. Development of an Atomic Force Microscope:.
URL: http://resolver.tudelft.nl/uuid:3a2fd406-f917-4406-9d6e-02db018be498
► This abstract presents the development of an Atomic Force Microscope (AFM) vertical scanner for surface topography measurements, which is composed of a single axis positioning… (more)
▼ This abstract presents the development of an Atomic Force Microscope (AFM) vertical scanner for surface topography measurements, which is composed of a single axis positioning stage with an integrated metrology system and AFM probe. The scanner is meant to track and measure a maximum topography step of 10 μm with a measurement resolution of less then 0.1 nm and an uncertainty of less than 10 nm (1←) at a controllable bandwidth of at least 2 kHz. Advisors/Committee Members: Spronck, J.W..
Subjects/Keywords: Atomic Force; Microscope
Obrebski, J. W. (2010). Development of an Atomic Force Microscope: . (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:3a2fd406-f917-4406-9d6e-02db018be498
Obrebski, J W. "Development of an Atomic Force Microscope:." 2010. Masters Thesis, Delft University of Technology. Accessed July 18, 2019. http://resolver.tudelft.nl/uuid:3a2fd406-f917-4406-9d6e-02db018be498.
Obrebski, J W. "Development of an Atomic Force Microscope:." 2010. Web. 18 Jul 2019.
Obrebski JW. Development of an Atomic Force Microscope:. [Internet] [Masters thesis]. Delft University of Technology; 2010. [cited 2019 Jul 18]. Available from: http://resolver.tudelft.nl/uuid:3a2fd406-f917-4406-9d6e-02db018be498.
Obrebski JW. Development of an Atomic Force Microscope:. [Masters Thesis]. Delft University of Technology; 2010. Available from: http://resolver.tudelft.nl/uuid:3a2fd406-f917-4406-9d6e-02db018be498
4. Horocholyn, Kalyna. Comparative Histology of Burned Mammals Using Light Microscopy: Examining Heat-Induced Changes in Femoral Samples of Deer, Pig and Cow.
Degree: MA, Department of Anthropology, 2013, University of Alberta
URL: https://era.library.ualberta.ca/files/6m311p37v
► This study focuses on the histological comparisons between deer, pig and cow. Five femoral specimens from each species were selected and burned at 600 °C,… (more)
▼ This study focuses on the histological comparisons between deer, pig and cow. Five femoral specimens from each species were selected and burned at 600 °C, 800 °C and 1000 °C. Burned and unburned control samples were thin-sectioned for light microscopic analysis. Visibility of histological structures in burned samples was reduced due to carbonization. Limitations in visible cortical areas resulted in biased sampling selections and smaller sample sizes. Quantitative analysis showed evidence of deer Haversian structures being the smallest and cow Haversian structures being the largest of the samples studied. Statistical analysis demonstrated changes in osteon dimensions of pig and cow samples at 800 °C and 1000 °C. The contraction of osteons in pig burned samples at these two temperatures led to pig osteon dimensions being similar to those of deer osteons at 800 °C and 1000 °C. This result suggests that species differentiation may be difficult to conduct on burned specimens above 600 °C.
Subjects/Keywords: burned; bioarchaeology; light microscope; histology
Horocholyn, K. (2013). Comparative Histology of Burned Mammals Using Light Microscopy: Examining Heat-Induced Changes in Femoral Samples of Deer, Pig and Cow. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/6m311p37v
Horocholyn, Kalyna. "Comparative Histology of Burned Mammals Using Light Microscopy: Examining Heat-Induced Changes in Femoral Samples of Deer, Pig and Cow." 2013. Masters Thesis, University of Alberta. Accessed July 18, 2019. https://era.library.ualberta.ca/files/6m311p37v.
Horocholyn, Kalyna. "Comparative Histology of Burned Mammals Using Light Microscopy: Examining Heat-Induced Changes in Femoral Samples of Deer, Pig and Cow." 2013. Web. 18 Jul 2019.
Horocholyn K. Comparative Histology of Burned Mammals Using Light Microscopy: Examining Heat-Induced Changes in Femoral Samples of Deer, Pig and Cow. [Internet] [Masters thesis]. University of Alberta; 2013. [cited 2019 Jul 18]. Available from: https://era.library.ualberta.ca/files/6m311p37v.
Horocholyn K. Comparative Histology of Burned Mammals Using Light Microscopy: Examining Heat-Induced Changes in Femoral Samples of Deer, Pig and Cow. [Masters Thesis]. University of Alberta; 2013. Available from: https://era.library.ualberta.ca/files/6m311p37v
5. Lewandowski, Brian Robert. Scanning probe microscopy investigations of (1) arrays of cysteine-coated CdS nanoparticles and (2) structures formed during the early stages of the corrosion of copper surfaces.
Degree: PhD, Chemistry, 2009, Louisiana State University
URL: etd-04162009-223459 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1566
► Scanning probe microscopy (SPM) characterizations are becoming more prevalent for surface investigations due to their capabilities for obtaining structural information and physical measurements. New capabilities… (more)
▼ Scanning probe microscopy (SPM) characterizations are becoming more prevalent for surface investigations due to their capabilities for obtaining structural information and physical measurements. New capabilities of SPM for studying and controlling nanoscale processes are emerging as valuable assets in research. A fundamental understanding of the interactions of surface reactions provides essential information for developing workable applications for nanotechnology. Two applications of SPM are discussed in this dissertation. The first investigation uses atomic force microscopy (AFM) for the characterization of nanostructures produced with a newly developed lithographic technique called "two-particle" lithography. This new technique is based on particle lithography for the patterning of nanoparticles. Structural templates of either latex or silica guide the deposition of nanoparticles to generate 2D arrays of nanopatterns. The surface coverage, size and periodicity of the nanoparticle structures can be controlled by changing the particle size of the templating sphere. Particle lithography provides test platforms to enable multiple reproducible SPM measurements for nanostructures which have well-defined geometries and surface arrangements. The second part of the dissertation discusses the results from using AFM to study the earliest stages of the onset of water corrosion of copper surfaces with nanoscale resolution. Within a few hours of exposure to water of varying chemistries, dramatic differences in the morphology of copper surfaces were observed by ex situ AFM topography imaging. Surface characterizations of the treated copper samples were used systematically to evaluate changes for copper surfaces with various chemical treatments and to investigate mechanisms of passivation and corrosion.
Subjects/Keywords: atomic force microscope; nanopatterning; corrosion
Lewandowski, B. R. (2009). Scanning probe microscopy investigations of (1) arrays of cysteine-coated CdS nanoparticles and (2) structures formed during the early stages of the corrosion of copper surfaces . (Doctoral Dissertation). Louisiana State University. Retrieved from etd-04162009-223459 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1566
Lewandowski, Brian Robert. "Scanning probe microscopy investigations of (1) arrays of cysteine-coated CdS nanoparticles and (2) structures formed during the early stages of the corrosion of copper surfaces." 2009. Doctoral Dissertation, Louisiana State University. Accessed July 18, 2019. etd-04162009-223459 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1566.
Lewandowski, Brian Robert. "Scanning probe microscopy investigations of (1) arrays of cysteine-coated CdS nanoparticles and (2) structures formed during the early stages of the corrosion of copper surfaces." 2009. Web. 18 Jul 2019.
Lewandowski BR. Scanning probe microscopy investigations of (1) arrays of cysteine-coated CdS nanoparticles and (2) structures formed during the early stages of the corrosion of copper surfaces. [Internet] [Doctoral dissertation]. Louisiana State University; 2009. [cited 2019 Jul 18]. Available from: etd-04162009-223459 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1566.
Lewandowski BR. Scanning probe microscopy investigations of (1) arrays of cysteine-coated CdS nanoparticles and (2) structures formed during the early stages of the corrosion of copper surfaces. [Doctoral Dissertation]. Louisiana State University; 2009. Available from: etd-04162009-223459 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1566
6. Liu, Yingnan, M.A. Microwave impedance microscope study of two dimensional materials.
Degree: Physics, 2015, University of Texas – Austin
► In this thesis, I will introduce a unique technique, microwave impedance microscope (MIM), which has shown its potential in characterization of local electrical inhomogeneity of… (more)
▼ In this thesis, I will introduce a unique technique, microwave impedance microscope (MIM), which has shown its potential in characterization of local electrical inhomogeneity of materials. I will also discuss some results about the study of In₂Se₃ and MoS₂ electrical properties with MIM. Advisors/Committee Members: Lai, Keji, 1978- (advisor), Shih, Chih-Kang (committee member).
Subjects/Keywords: Microwave impedance microscope; 2D materials
Liu, Yingnan, M. A. (2015). Microwave impedance microscope study of two dimensional materials . (Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/32068
Liu, Yingnan, M A. "Microwave impedance microscope study of two dimensional materials." 2015. Thesis, University of Texas – Austin. Accessed July 18, 2019. http://hdl.handle.net/2152/32068.
Liu, Yingnan, M A. "Microwave impedance microscope study of two dimensional materials." 2015. Web. 18 Jul 2019.
Liu, Yingnan MA. Microwave impedance microscope study of two dimensional materials. [Internet] [Thesis]. University of Texas – Austin; 2015. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/2152/32068.
Liu, Yingnan MA. Microwave impedance microscope study of two dimensional materials. [Thesis]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/32068
7. Kazemzadeh, Farnoud. Laser Interference Fringe Tomography - A Novel 3D Imaging Microscopy Technique.
► Laser interference fringe tomography (LIFT) is within the class of optical imaging devices designed for volumetric microscope applications. LIFT is a very simple and cost-effective… (more)
▼ Laser interference fringe tomography (LIFT) is within the class of optical imaging devices designed for volumetric microscope applications. LIFT is a very simple and cost-effective three-dimensional imaging device which is able to reliably produce low-quality imagery. It measures the reflectivity as a function of depth within a sample and is capable of producing three-dimensional images from optically scattering surfaces. The first generation of this instrument is designed and prototyped for optical microscopy. With an imaging spot size of 42 μm and a 180 μm axial resolution kernel, LIFT is capable of producing one- and two- dimensional images of various samples up to 1.5 mm thickness. The prototype was built using commercial-off-the-shelf components and cost ~ $1,000. It is possible that with effort, this device can become a reliable, stable, low-quality volumetric imaging microscope to be readily available to the consumer market at a very affordable price. This document will present the optical design of LIFT along with the complete mathematical description of the instrument. The design trade-offs and choices of the instrument are discussed in detail and justified. The theoretical imaging capabilities of the instrument are tested and experimentally verified. Finally, some imaging results are presented and discussed.
Subjects/Keywords: Interferometry; Imaging Microscope; Tomography; Instrumentation
Kazemzadeh, F. (2011). Laser Interference Fringe Tomography - A Novel 3D Imaging Microscopy Technique . (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/6286
Kazemzadeh, Farnoud. "Laser Interference Fringe Tomography - A Novel 3D Imaging Microscopy Technique." 2011. Thesis, University of Waterloo. Accessed July 18, 2019. http://hdl.handle.net/10012/6286.
Kazemzadeh, Farnoud. "Laser Interference Fringe Tomography - A Novel 3D Imaging Microscopy Technique." 2011. Web. 18 Jul 2019.
Kazemzadeh F. Laser Interference Fringe Tomography - A Novel 3D Imaging Microscopy Technique. [Internet] [Thesis]. University of Waterloo; 2011. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/10012/6286.
Kazemzadeh F. Laser Interference Fringe Tomography - A Novel 3D Imaging Microscopy Technique. [Thesis]. University of Waterloo; 2011. Available from: http://hdl.handle.net/10012/6286
8. Maroufi, Mohammad. MEMS-based nanopositioning for on-chip high-speed scanning probe microscopy.
Degree: PhD, 2015, University of Newcastle
URL: http://hdl.handle.net/1959.13/1309594
Research Doctorate - Doctor of Philosophy (PhD)
Nanopositioners constitute a crucial component of numerous emerging scientific instruments due to their ability to produce displacements with… (more)
Nanopositioners constitute a crucial component of numerous emerging scientific instruments due to their ability to produce displacements with nanometer or sub-nanometer precision. In particular, these devices are predominantly used in scanning probe microscopes (SPMs) to position samples beneath the probe. The positioning precision of an incorporated nanopositioner directly affects the imaging quality of these microscopes. Since SPMs are mechanical microscopes, their imaging frame rate also depends on the speed of the implemented nanopositioner. In this research, the micro electromechanical system (MEMS) technology, as an alternative to macroscale technology, is used to realize high-speed on-chip nanopositioners for SPMs. Atomic force microscopes (AFMs), as an important subset of SPMs, are also used to test the capability of these nanopositioners in imaging. A comprehensive study is conducted on previously reported MEMS nanopositioners proposed for different applications. Various actuation and sensing techniques, which are viable to be incorporated in MEMS nanopositioners, are presented and their characteristics are thoroughly discussed. The design concerns relevant to electrostatic MEMS nanopositioners are discussed using analytical models. These models are later used as the baseline for designing novel electrostatic MEMS nanopositioners. These nanopositioners are fabricated and fully characterized as explained in different chapters in this thesis. All proposed nanopositioners are also used within an AFM for imaging. In addition, closed-loop feedback controllers are implemented for a number of the nanopositioners to attain raster and non-raster scans with a superior tracking performance. Both serial and parallel kinematic mechanisms are attempted for the implementation of the proposed nanopositioners. Various performance parameters relevant to the use of either of these mechanisms are investigated using experimental results. Displacement sensing bandwidth in some of the proposed nanopositioners is identified as a restricting factor to achieve higher scanning speeds. Hence, a novel high-bandwidth on-chip sensing mechanism for measuring stage displacement is introduced. The sensor is implemented in a single-degree-of-freedom MEMS nanopositioner as a test bench. Both analytical models and experimental data are provided for the sensor to investigate its static and dynamic features. To achieve a wider bandwidth, the on-chip configuration of the sensor is also modified, and the modified version is implemented in a novel two-degree-of-freedom MEMS nanopositioner. The performance results obtained from the proposed nanopositioners highlight their potential utility in a miniaturized high-speed AFM. The proposed nanopositioners demonstrate outstanding characteristics in terms of bandwidth, cross coupling rejection, and displacement range. All designs have the potential to be used in high accuracy positioning applications, particularly in on-chip AFMs.
Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Environment, School of Electrical Engineering and Computer Science.
Subjects/Keywords: nanopositioner; MEMS; atomic force microscope
Maroufi, M. (2015). MEMS-based nanopositioning for on-chip high-speed scanning probe microscopy . (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1309594
Maroufi, Mohammad. "MEMS-based nanopositioning for on-chip high-speed scanning probe microscopy." 2015. Doctoral Dissertation, University of Newcastle. Accessed July 18, 2019. http://hdl.handle.net/1959.13/1309594.
Maroufi, Mohammad. "MEMS-based nanopositioning for on-chip high-speed scanning probe microscopy." 2015. Web. 18 Jul 2019.
Maroufi M. MEMS-based nanopositioning for on-chip high-speed scanning probe microscopy. [Internet] [Doctoral dissertation]. University of Newcastle; 2015. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/1959.13/1309594.
Maroufi M. MEMS-based nanopositioning for on-chip high-speed scanning probe microscopy. [Doctoral Dissertation]. University of Newcastle; 2015. Available from: http://hdl.handle.net/1959.13/1309594
9. Sun, Kewei. Structural and Optical Properties of Wide Bandgap Nitride Semiconductors Using Electron Microscopy Techniques.
Degree: PhD, Physics, 2011, Arizona State University
URL: http://repository.asu.edu/items/14298
► ABSTRACT Group III-nitride semiconductor materials have been commercially used in fabrication of light-emitting diodes (LEDs) and laser diodes (LDs) covering the spectral range from UV… (more)
▼ ABSTRACT Group III-nitride semiconductor materials have been commercially used in fabrication of light-emitting diodes (LEDs) and laser diodes (LDs) covering the spectral range from UV to visible and infrared, and exhibit unique properties suitable for modern optoelectronic applications. Great advances have recently happened in the research and development in high-power and high-efficiency blue-green-white LEDs, blue LDs and other optoelectronic applications. However, there are still many unsolved challenges with these materials. In this dissertation, several issues concerning structural, electronic and optical properties of III-nitrides have been investigated using a combination of transmission electron microscopy (TEM), electron holography (EH) and cathodoluminescence (CL) techniques. First, a trend of indium chemical inhomogeneity has been found as the indium composition increases for the InGaN epitaxial layers grown by hydride vapor phase epitaxy. Second, different mechanisms contributing to the strain relaxation have been studied for non-polar InGaN epitaxial layers grown on zinc oxide (ZnO) substrate. Third, various structural morphologies of non-polar InGaN epitaxial layers grown on free-standing GaN substrate have been investigated. Fourth, the effect of the growth temperature on the performance of GaN lattice-matched InAlN electron blocking layers has been studied. Finally, the electronic and optical properties of GaN nanowires containing a AlN/GaN superlattice structure have been investigated showing relatively small internal electric field and superlattice- and defect-related emissions along the nanowires.
Subjects/Keywords: Physics; Electron Microscope; Nitride Semiconductor
Sun, K. (2011). Structural and Optical Properties of Wide Bandgap Nitride Semiconductors Using Electron Microscopy Techniques . (Doctoral Dissertation). Arizona State University. Retrieved from http://repository.asu.edu/items/14298
Sun, Kewei. "Structural and Optical Properties of Wide Bandgap Nitride Semiconductors Using Electron Microscopy Techniques." 2011. Doctoral Dissertation, Arizona State University. Accessed July 18, 2019. http://repository.asu.edu/items/14298.
Sun, Kewei. "Structural and Optical Properties of Wide Bandgap Nitride Semiconductors Using Electron Microscopy Techniques." 2011. Web. 18 Jul 2019.
Sun K. Structural and Optical Properties of Wide Bandgap Nitride Semiconductors Using Electron Microscopy Techniques. [Internet] [Doctoral dissertation]. Arizona State University; 2011. [cited 2019 Jul 18]. Available from: http://repository.asu.edu/items/14298.
Sun K. Structural and Optical Properties of Wide Bandgap Nitride Semiconductors Using Electron Microscopy Techniques. [Doctoral Dissertation]. Arizona State University; 2011. Available from: http://repository.asu.edu/items/14298
10. Reagan, Michael A. Electric Charging and Nanostructure Formation in Polymeric Films using Combined Amplitude-Modulated Atomic Force Microscopy Assisted Electrostaitc Nanolithography and Electric Force Microscopy.
Degree: MSin Polymer Engineering, Polymer Engineering, 2009, University of Akron
URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1239637956
► Chemically induced rearrangements of amphifunctional molecules have been demonstrated using strong nonuniform electric fields (108-1010 V/m) induced in the vicinity of nanoscale asperities. Electrostatic… (more)
▼ Chemically induced rearrangements of amphifunctional molecules have been demonstrated using strong nonuniform electric fields (108-1010 V/m) induced in the vicinity of nanoscale asperities. Electrostatic interactions utilizing these rearrangements of alkylthiolates assembled on Au(111) result in the nanopatterning of raised nanostructure (1.5 - 9 nm high, 15 - 100 nm wide) arrays on a second time scale by manipulating an atomic force microscope (AFM) tip above the monolayer. It is suspected that, as a result of the oxidative cleavage initiated by a weak bias of the tip, the S end of the alkylthiolate chain carrying a sulfenium cation is attracted to the (lifting) tip, forming bi- and higher-layer structures in the vicinity of the tip apex. Stabilization of the multiple-layered structures is accomplished via mutual attraction and entanglement of hydrocarbon chains. The rearrangements suggest a novel and general approach for nanoscale architecture in self-assembled systems. Water condensation is shown to have a major influence on electric charge transport and nanostructure formation in polymer-, and semiconductor-thin-film surfaces in the proximity of a biased Atomic Force Microscope (AFM) tip. The water forms a meniscus bridge between the AFM tip and the surface to form a three-component system comprised of the AFM tip, water meniscus, and the surface. The associated electric field in the meniscus is spatially non-uniform and has a magnitude of the order of 108-1010 V/m. An intensive experimental analysis of the input and output electric currents in the AFM tip/water meniscus/surface system, performed at various relative humidity levels between 10 and 60%, indicates that the magnitude of the output current, drained from surface, reaches values as large as several µ¿¿¿¿A which exceeds the input current, injected via the AFM tip (0.01-10 nA), by at least an order of magnitude. This effect is particularly evident when the relative humidity is greater than 20-25%, suggesting that the water meniscus is ionized by the strong electric field to produce electrons. Since the method described here for nanopatterning is applicable for materials with significantly different physical, electronic, and optical properties, and is dependent largely on the ambient humidity level and the strength of the electric field, it is suggested that the method may be extended to a variety of other materials. We utilized a hybrid technique, based on lithography exploiting atomic force microscope tip manipulation combined with modified Electric Force Microscopy to study surface electric charging (deposition and evolution) of poly-methyl methacryalate (PMMA) and polystyrene (PS) films. Two distinct regimes were observed: 1) Mass transport regime related to electric breakdown due to the negative surface charging followed by stable nanostructure formation (negative tip bias); 2) Occasional - to - no feature formation regime attributed to elastic deformation of polymer surface followed by the… Advisors/Committee Members: Sancaktar, Erol (Advisor), Lyuksyutov, Sergei (Advisor).
Subjects/Keywords: Physics; Polymers; nanolithography; physics; polymer; atomic force microscope; electric force microscope
Reagan, M. A. (2009). Electric Charging and Nanostructure Formation in Polymeric Films using Combined Amplitude-Modulated Atomic Force Microscopy Assisted Electrostaitc Nanolithography and Electric Force Microscopy . (Masters Thesis). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1239637956
Reagan, Michael A. "Electric Charging and Nanostructure Formation in Polymeric Films using Combined Amplitude-Modulated Atomic Force Microscopy Assisted Electrostaitc Nanolithography and Electric Force Microscopy." 2009. Masters Thesis, University of Akron. Accessed July 18, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1239637956.
Reagan, Michael A. "Electric Charging and Nanostructure Formation in Polymeric Films using Combined Amplitude-Modulated Atomic Force Microscopy Assisted Electrostaitc Nanolithography and Electric Force Microscopy." 2009. Web. 18 Jul 2019.
Reagan MA. Electric Charging and Nanostructure Formation in Polymeric Films using Combined Amplitude-Modulated Atomic Force Microscopy Assisted Electrostaitc Nanolithography and Electric Force Microscopy. [Internet] [Masters thesis]. University of Akron; 2009. [cited 2019 Jul 18]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1239637956.
Reagan MA. Electric Charging and Nanostructure Formation in Polymeric Films using Combined Amplitude-Modulated Atomic Force Microscopy Assisted Electrostaitc Nanolithography and Electric Force Microscopy. [Masters Thesis]. University of Akron; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1239637956
11. Lieb, Sydnie Marie. Experimental investigation of nascent soot physical properties and the influence on particle morphology and growth.
Degree: PhD, Mechanical Engineering, 2014, University of Southern California
URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/430117/rec/2626
► Soot released to the atmosphere is a dangerous pollutant for human health and the environment. Understanding the physical properties and surface properties of these particles… (more)
▼ Soot released to the atmosphere is a dangerous pollutant for human health and the environment. Understanding the physical properties and surface properties of these particles is important to properly explaining the growth of soot particles in flames as well as their interactions with other particles and gases in the environment. Particles below 15 nm in diameter, nascent soot particles, dominate the early growth stages of soot formation; previously these particles were characterized as hard graphitic spheres. New evidence derived from the current dissertation work, to a large extent, challenges this prior characterization. ❧ This dissertation study begins by revisiting the use of atomic force microscope (AFM) as a tool to investigate the structural properties of nascent soot. The impact of tip artifacts, which are known to complicate measurements of features below 10 nm in diameter, are carefully considered so as to provide a concise interpretation of the morphology of nascent soot as seen by AFM. The results of the AFM morphology collaborate with earlier photo‐ and thermal‐fragmentation particle mass spectrometry and Fourier transform infrared spectroscopy that nascent soot is not a graphitized carbon material and that they are not spherical. Furthermore, phase mode imaging is introduced as a method to investigate the physical properties of nascent soot particles in a greater detail and finer resolution. ❧ The helium ion microscope (HIM) has been identified as a useful technique for the imaging of nascent soot. Using this imaging method nascent soot particles were imaged with a high resolution that had not been obtained by prior techniques. The increased contrast provides a closer look at the nascent soot particles and further suggested that these particles are not as structurally homogeneous as previously thought. Geometric shape analysis was performed to characterize the particles in terms of sphericity, circularity, and fractal dimension. The geometric analysis showed that the particles deviate from spherical and that they are not characterized by a defined structure. This observation supports the theory that nascent soot is not homogenous in structure or composition, and challenges the classical assumption that spherical growth and aggregation are separate, size dependent processes. ❧ In light of the new evidence that suggests nascent soot particles are structurally inhomogenous, careful consideration must be given to mobility measurements of particle mass and size. The interpretation of particle volume of irregularly shaped nascent soot particles is considered in this dissertation work. Additionally, uncertainties in the mass density of nascent soot are reviewed and the error in mass calculation is quantified. Advisors/Committee Members: Wang, Hai (Committee Chair), Ronney, Paul D. (Committee Member), Malmstadt, Noah (Committee Member).
Subjects/Keywords: soot; atomic force microscope; combustion; helium ion microscope
Lieb, S. M. (2014). Experimental investigation of nascent soot physical properties and the influence on particle morphology and growth . (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/430117/rec/2626
Lieb, Sydnie Marie. "Experimental investigation of nascent soot physical properties and the influence on particle morphology and growth." 2014. Doctoral Dissertation, University of Southern California. Accessed July 18, 2019. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/430117/rec/2626.
Lieb, Sydnie Marie. "Experimental investigation of nascent soot physical properties and the influence on particle morphology and growth." 2014. Web. 18 Jul 2019.
Lieb SM. Experimental investigation of nascent soot physical properties and the influence on particle morphology and growth. [Internet] [Doctoral dissertation]. University of Southern California; 2014. [cited 2019 Jul 18]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/430117/rec/2626.
Lieb SM. Experimental investigation of nascent soot physical properties and the influence on particle morphology and growth. [Doctoral Dissertation]. University of Southern California; 2014. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/430117/rec/2626
Université Montpellier II
12. Riedel, Clément. Dielectric and mechanical properties of polymers at macro and nanoscale : Propriétés dielectriques et mecaniques des polymeres aux échelle macroscopiques et nanoscopique.
Degree: Docteur es, Milieux denses et matériaux, 2010, Université Montpellier II
URL: http://www.theses.fr/2010MON20073
Le but de cette thèse était tout d'abord de comprendre les théories physiques qui décrivent la dynamique des polymères à l'échelle macroscopique. Le modèle de… (more)
Le but de cette thèse était tout d'abord de comprendre les théories physiques qui décrivent la dynamique des polymères à l'échelle macroscopique. Le modèle de Rouse et la théorie d'enchevêtrement de De Gennes décrivent la dynamique des polymères non enchevêtrés et enchevêtrés, respectivement. Nous avons étudiés les différentes transitions entre ces deux régimes en utilisant deux techniques expérimentales: Broadband Dielectric Spectroscopy (BDS) et rhéologie. Les effets d'enchevêtrement sur les spectres diélectriques ont été discutés. Un test complet du modèle de Rouse à été effectué sur en comparant les prédictions de ce modèle pour la dépendance en fréquence de la permittivité diélectrique et du module de cisaillement aux données expérimentales. Ensuite nous avons développés des méthodes bas"s sur la microscopie à force électrostatique afin d'étudier les propriétés diélectriques locales. En utilisant la simulation numérique de la Méthode des Charges Equivalentes la constante diélectrique a été quantifiée à partir de la mesure du gradient de force crée par un potentiel statique entre une pointe et un diélectrique. Cette méthode permet d'imager la constante diélectrique avec une résolution spatial de 40 nm. Le retard de phase de la composante en 2ω de la force ou du gradient de force crée par un voltage alternatif est relié aux pertes diélectriques. En mesurant cette quantité nous avons montré que la dynamique était plus rapide proche d'une interface libre et nous avons développé un mode d'imagerie des pertes diélectriques. Cette méthode simple pourrait être appliqué en biologie ou matière molle en générale afin d'étudier des variations locales de constantes diélectriques.
The aim of this thesis was first to understand the physical theories that describe the dynamics of linear polymers at the macroscopic scale. Rouse and the reptational tube theory describe the large scale dynamics of unentangled and entangled polymers respectively. Using Broadband Dielectric Spectroscopy (BDS) and rheology we have studied the different transition between these two regimes. Effects of entanglement on dielectric spectra will be discussed (Rheologica Acta. 49(5):507-512). Avoiding the segmental relaxation contribution and introducing a distribution in the molecular weight we have been able to perform a comparison of the Rouse model with experiment dielectric and rheological data (Macromolecules 42(21): 8492-8499) Then we have developed EFM-based methods in order to study the local dynamics. Using the numerical simulation of the Equivalent Charge Method, the value of the static dielectric permittivity has been quantified from the measurement of the force gradient created by a VDC potential between a tip and a grounded dielectric (Journal of Applied Physics 106(2):024315). This method allows a quantitative mapping of dielectric properties with a 40 nm spatial resolution and is therefore suitable for the study of nano-defined domains (Physical Review E 81(1): 010801). The electrical phase lags in the 2ω components of the force or force…
Advisors/Committee Members: Tordjeman, Philippe (thesis director), Colmenero, Juan (thesis director).
Subjects/Keywords: Polymer; Dynamique; Microscope à force atomique; Polymer; Dynamics; Atomic force microscope
Riedel, C. (2010). Dielectric and mechanical properties of polymers at macro and nanoscale : Propriétés dielectriques et mecaniques des polymeres aux échelle macroscopiques et nanoscopique . (Doctoral Dissertation). Université Montpellier II. Retrieved from http://www.theses.fr/2010MON20073
Riedel, Clément. "Dielectric and mechanical properties of polymers at macro and nanoscale : Propriétés dielectriques et mecaniques des polymeres aux échelle macroscopiques et nanoscopique." 2010. Doctoral Dissertation, Université Montpellier II. Accessed July 18, 2019. http://www.theses.fr/2010MON20073.
Riedel, Clément. "Dielectric and mechanical properties of polymers at macro and nanoscale : Propriétés dielectriques et mecaniques des polymeres aux échelle macroscopiques et nanoscopique." 2010. Web. 18 Jul 2019.
Riedel C. Dielectric and mechanical properties of polymers at macro and nanoscale : Propriétés dielectriques et mecaniques des polymeres aux échelle macroscopiques et nanoscopique. [Internet] [Doctoral dissertation]. Université Montpellier II; 2010. [cited 2019 Jul 18]. Available from: http://www.theses.fr/2010MON20073.
Riedel C. Dielectric and mechanical properties of polymers at macro and nanoscale : Propriétés dielectriques et mecaniques des polymeres aux échelle macroscopiques et nanoscopique. [Doctoral Dissertation]. Université Montpellier II; 2010. Available from: http://www.theses.fr/2010MON20073
13. He, Xuefei. Advanced volumetric microscopy techniques for dynamic studies of anucleate cells .
Degree: 2018, Australian National University
► Optical imaging is a cornerstone in biological and biomedical sciences. It is imperative to not only obtain high-resolution images but also provide real-time quantification of… (more)
▼ Optical imaging is a cornerstone in biological and biomedical sciences. It is imperative to not only obtain high-resolution images but also provide real-time quantification of biological measurement using automated non-invasive imaging solutions. In recent years, the advent of volumetric microscopes, especially laser scanning microscopy (LSM) and quantitative phase microscopy (QPM), has opened up new powerful imaging tools for biological studies. One of the primary biological activities that require volumetric imaging is blood dynamics. Blood is an essential component in the circulatory system, which transports nutrients, oxygen, and waste for the entire body. Anucleate blood cells, red blood cells (RBCs) and platelets, are majority contributors in homeostasis, the state of steady internal conditions, and hemostasis, the process of bleeding control. Any morphological anomalies of RBCs and platelets could result in mortality. For examples, poor deformability of RBCs influenced by blood-borne diseases (e.g. malaria, sickle) can result in poor delivery of nutrients and oxygen to major visceral organs. And excessive or insufficient blood coagulation due to kinds of platelet disorders can lead to thrombosis or abnormal bleeding. This thesis presents the development of volumetric imaging systems and tailored microfluidics platform for the study of diseased anucleate blood cells. Using a custom-built automated QPM system, quantitative deformability measurement of parasites infected RBCs was conducted using an adhesion assay. Furthermore, real-time QPM imaging of platelets aggregation was achieved for studying thrombus dynamic. Then, a hybrid image system, Holographic inverted Single Plane Illumination Microscopy (H+iSPIM), was developed to retrieve both structural and molecular information, providing multidimensional images at the same time. The first chapter introduces the aims and the structure of the thesis. The second, third and fourth chapters presents background of the techniques used in the thesis; volumetric microscopy techniques, biomechanics of anucleate blood cells, and microfluidic respectively. Chapter five elaborates the hardware and software development for an automated DHM system. This chapter is meant to extend the usage of DHM by automated image processing and data analysis. The next following two chapters (six and seven) describe the deformability studies of infected RBC and dynamics of platelet-platelet aggregate. Chapter eight proposes a hybrid imaging system, H+iSPIM, for multidimensional studies of cells in microfluidic systems. Conclusions, future works, and limitations of the developed system are discussed in the final chapter. In summary, this thesis presents the pursuit of versatile imaging systems for non-invasive imaging quantification of dynamic cellular studies using microfluidic devices for blood-related diseases.
Subjects/Keywords: volumetric microscopy techniques; digital holographic microscope; microfluidics; light sheet microscope
He, X. (2018). Advanced volumetric microscopy techniques for dynamic studies of anucleate cells . (Thesis). Australian National University. Retrieved from http://hdl.handle.net/1885/157202
He, Xuefei. "Advanced volumetric microscopy techniques for dynamic studies of anucleate cells ." 2018. Thesis, Australian National University. Accessed July 18, 2019. http://hdl.handle.net/1885/157202.
He, Xuefei. "Advanced volumetric microscopy techniques for dynamic studies of anucleate cells ." 2018. Web. 18 Jul 2019.
He X. Advanced volumetric microscopy techniques for dynamic studies of anucleate cells . [Internet] [Thesis]. Australian National University; 2018. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/1885/157202.
He X. Advanced volumetric microscopy techniques for dynamic studies of anucleate cells . [Thesis]. Australian National University; 2018. Available from: http://hdl.handle.net/1885/157202
14. Barr, Matthew Gordon. Imaging with atoms: aspects of scanning helium microscopy.
Microscopy is an essential tool for the discovery, application and fabrication of new materials, structures and devices. However,… (more)
Microscopy is an essential tool for the discovery, application and fabrication of new materials, structures and devices. However, there exists a range of systems that are traditionally challenging to image, such as transparent, weakly-bonded, insulating, very rough and magnetic samples. Furthermore, many of these systems (such as organic thin films, biological specimens and delicate adsorbate structures) suffer degradation under the energetic photons, electrons or ions of conventional microscopies. Neutral helium is the ideal probe of such surfaces, owing to its low mass, lack of net charge or spin, and short de Broglie wavelength. Moreover, the low kinetic energy of thermal helium atoms (of the order meV) means that these probe particles are unambiguously surface sensitive, scattering from the outermost electron corrugation of the sample. The advantages of helium atoms as a surface probe have already been demonstrated in the established technique of Helium Atom Scattering (HAS). Nevertheless, HAS is limited by its lack of spatial resolution, hence limiting its application to relatively simple, heterogeneous systems. The work presented in this thesis describes the realisation of a fundamentally new imaging technique based on HAS. This instrument, in which a fine beam of helium is rastered over a sample, operates in a similar configuration to a scanning electron microscope and hence is referred to as a Scanning Helium Microscope or SHeM. Chapter 1 examines the motivations for constructing a SHeM, and then provides an assessment of the technologies required to demonstrate proof of concept of the technique. In Chapter 2, an appropriate measure of image contrast is provided, alongside a detailed discussion of the potential mechanisms by which SHeM image contrast could be generated. Thereafter, a semi-empirical gas flow model of SHeM performance is outlined, providing an avenue towards the construction of a practicable instrument. Chapter 3 commences with a comprehensive description of the design, construction and characterisation of the first-generation SHeM. This prototype instrument was then used to image a range of systems, demonstrating contrast that arises predominantly from the surface topology of the sample. To address the primary weaknesses of the prototype instrument, a second-generation SHeM was then constructed, with an aim towards the observation of weaker, more exotic contrast mechanisms. The design, construction and characterisation of the second instrument is outlined in Chapter 4, whilst the subsequent contrast investigations are detailed in Chapter 5. Indeed, the work reported in Chapter 5 constitutes the first demonstration of contrast arising from the elemental composition of the sample under investigation by SHeM. Furthermore, this chemical contrast is shown to be inelastic in nature and apparent under the oxide or physisorbed layers present in <i>ex situ</i> prepared samples. Chapter 6 then comprises a discussion of the design pathways to the…
Advisors/Committee Members: University of Newcastle. Faculty of Science & Information Technology, School of Mathematical and Physical Sciences.
Subjects/Keywords: scanning helium microscope; SHeM; helium atom scattering; HAS; neutral atom microscope
Barr, M. G. (2016). Imaging with atoms: aspects of scanning helium microscopy . (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1312654
Barr, Matthew Gordon. "Imaging with atoms: aspects of scanning helium microscopy." 2016. Doctoral Dissertation, University of Newcastle. Accessed July 18, 2019. http://hdl.handle.net/1959.13/1312654.
Barr, Matthew Gordon. "Imaging with atoms: aspects of scanning helium microscopy." 2016. Web. 18 Jul 2019.
Barr MG. Imaging with atoms: aspects of scanning helium microscopy. [Internet] [Doctoral dissertation]. University of Newcastle; 2016. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/1959.13/1312654.
Barr MG. Imaging with atoms: aspects of scanning helium microscopy. [Doctoral Dissertation]. University of Newcastle; 2016. Available from: http://hdl.handle.net/1959.13/1312654
15. Lee, Hyungoo. Scanning Probe Alloying Nanolithography (SPAN).
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-743
► In recent years, nanowires have become increasingly important due to their unique properties and applications. Thus, processes in the fabrication to nanostructures has come a… (more)
▼ In recent years, nanowires have become increasingly important due to their unique properties and applications. Thus, processes in the fabrication to nanostructures has come a focal point in research. In this research, a new method to fabricate nanowires has been developed. The new technique is called the Scanning Probe Alloying Nanolithography (SPAN). The SPAN was processed using an Atomic Force Microscope (AFM) in ambient environment. Firstly, an AFM probe was coated with gold (Au), and then slid on a silicon (Si) substrate. The contact-sliding motion generated a nanostructure on the substrate, instead of wear. Subsequently, careful examination was carried out at the scale relevant to an AFM probe, in terms of physical dimension and electrical conductivity. The measured conductivity value of the generated microstructures was found to be between the conductivity values of pure silicon and gold. Simple analysis indicated that the microstructures were formed due to frictional energy dispersed in the interface forming a bond to sustain mechanical wear. This research proves the feasibilities of tip-based nanomanufacturing. The SPAN process was developed to increase efficiency of the technique. This study also explored the possibility of the applications as a biosensor and a flexible device. This dissertation contains nine sections. The first section introduces backgrounds necessary to understand the subject matter. It reviews current status of the nanofabrication technologies. The basic concepts of AFM are also provided. The second section discusses the motivation and goals in detail. The third section covers the new technology, scanning probe alloying nanolithography (SPAN) to fabricate nanostructures. The fourth talks about characterization of nanostructures. Subsequently, the characterized nanostructures and their mechanical, chemical, and electrical properties are discussed in the fifth section. In the sixth section, the new process to form a nanostructure is evaluated and its mechanism is discussed. The seventh section discusses the feasibility of the nanostructures to be used in biosensors and flexible devices. The conclusion of the research is summarized in the seventh section. Advisors/Committee Members: Liang, Hong (advisor), Muliana, Anastasia (committee member), Radovic, Miladin (committee member), Hemmer, Philip (committee member).
Subjects/Keywords: Atomic force microscope; Scanning Probe; Nanoalloying; Nanolithography
Lee, H. (2010). Scanning Probe Alloying Nanolithography (SPAN) . (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-743
Lee, Hyungoo. "Scanning Probe Alloying Nanolithography (SPAN)." 2010. Thesis, Texas A&M University. Accessed July 18, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-743.
Lee, Hyungoo. "Scanning Probe Alloying Nanolithography (SPAN)." 2010. Web. 18 Jul 2019.
Lee H. Scanning Probe Alloying Nanolithography (SPAN). [Internet] [Thesis]. Texas A&M University; 2010. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-743.
Lee H. Scanning Probe Alloying Nanolithography (SPAN). [Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-743
16. Mohamed bak K. Acoustic emission characterization of failure modes on single and double lap joints of FRP under tensile loading;.
Degree: Acoustic emission characterization of failure modes on single and double lap joints of FRP under tensile loading, 2015, Anna University
In aerospace and automobile applications, various composite parts are required to be joined together using either adhesives or mechanical fasteners One of the aims of… (more)
In aerospace and automobile applications, various composite parts are required to be joined together using either adhesives or mechanical fasteners One of the aims of this research work is to discriminate the failure modes on lap joints of glass fiber reinforced plastic GFRP and basalt fiber reinforced plastic BFRP laminates and the role of composite structural design in the joint strength To design structural components a deep understanding about material behavior and its failure mechanisms is necessary Characterization of failure modes in the case of composite lap joints is a complex research subject Hence, the present study is focused on acoustic emission AE characterization of failure modes in three prominent joining methods namely bonded riveted and hybrid joints newlineThe aim of this research work is to identify the associated failure modes during tensile tests of composite lap joints using AE signals The AE data acquired during the tensile test has been analyzed using different techniques viz parametric studies failure discrimination based on the AE parameters fast Fourier transform FFT individual peak frequency content of each failure modes continuous wavelet transform CWT time information and frequency range for failure modes finite element analysis FEA Von Mises stress distribution and scanning electron microscope SEM possible failure modes using microscopic observation of fractured surface newline newline
appendix p196-202, reference p203-215.
Advisors/Committee Members: Kalaichelvan K.
Subjects/Keywords: Glass fiber reinforced; Scanning electron microscope
K, M. b. (2015). Acoustic emission characterization of failure modes on single and double lap joints of FRP under tensile loading; . (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/33184
K, Mohamed bak. "Acoustic emission characterization of failure modes on single and double lap joints of FRP under tensile loading;." 2015. Thesis, Anna University. Accessed July 18, 2019. http://shodhganga.inflibnet.ac.in/handle/10603/33184.
K, Mohamed bak. "Acoustic emission characterization of failure modes on single and double lap joints of FRP under tensile loading;." 2015. Web. 18 Jul 2019.
K Mb. Acoustic emission characterization of failure modes on single and double lap joints of FRP under tensile loading;. [Internet] [Thesis]. Anna University; 2015. [cited 2019 Jul 18]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/33184.
K Mb. Acoustic emission characterization of failure modes on single and double lap joints of FRP under tensile loading;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/33184
17. Haider, Ahmad. Direct measurement of energy landscapes of intermolecular and interfacial interactions using atomic force microscopy.
Degree: PhD, Mechanical Engineering, 2016, Georgia Tech
► Energy barriers encountered in intermolecular and interfacial interactions determine the kinetics and equilibrium outcome of a multitude of key physical, chemical, and biological processes. The… (more)
▼ Energy barriers encountered in intermolecular and interfacial interactions determine the kinetics and equilibrium outcome of a multitude of key physical, chemical, and biological processes. The free energy landscape, i.e. the strength and physical extent of interaction energies between molecules, dictates the specificity and affinity of biological interactions. Knowledge of the energy landscape is also essential to understand the direction of a chemical reaction, the relative stability of intermediate and final states, and the corresponding reaction mechanisms. Despite advances in measuring interaction forces, determining energy landscapes at nanometer dimensions remains a challenge. Computer simulations do provide a useful approach for estimating free energy landscapes but only to the limit of the accuracy of the model potentials and the integration of the equations of motion. Indirect experimental approaches such as dynamic force spectroscopy measurements also do not completely determine the shape or curvature of the energy landscape, nor can they detect the presence of intermediate metastable states. The emergence of ultrasensitive force detection techniques such as atomic force microscope (AFM) could prove invaluable in direct determination of energy landscapes since they combine excellent force and distance resolution with the ability to probe local interactions at nanoscale levels. In this thesis, we have developed a AFM based technique to directly measure the free energy landscape of biological and interfacial interactions. The technique applies the Brownian (thermal) fluctuations to vibrate a sensitive AFM microcantilever through the energy profile between the tip and surface. By recording subtle deviations from the harmonic cantilever vibrations, and applying Boltzmann transformation techniques, the energy landscape is reconstructed. These techniques have been applied to measure the binding energy landscapes of ligand-receptor interactions in a biotin-avidin system. Through the use of stochastic excitations, we have also extended the applicability of our methods in measuring energy landscapes of strongly adhesive interfacial interactions with steep energy gradients, such as those encountered in silicon nitride and mica interfaces. Advisors/Committee Members: Sulchek, Todd (advisor), Hesketh, Peter (committee member), Brand, Oliver (committee member), Bassiri-Gharb, Nazanin (committee member), Frazier, Albert (committee member).
Subjects/Keywords: Atomic force microscope; Energy landscape reconstruction
Haider, A. (2016). Direct measurement of energy landscapes of intermolecular and interfacial interactions using atomic force microscopy . (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/58585
Haider, Ahmad. "Direct measurement of energy landscapes of intermolecular and interfacial interactions using atomic force microscopy." 2016. Doctoral Dissertation, Georgia Tech. Accessed July 18, 2019. http://hdl.handle.net/1853/58585.
Haider, Ahmad. "Direct measurement of energy landscapes of intermolecular and interfacial interactions using atomic force microscopy." 2016. Web. 18 Jul 2019.
Haider A. Direct measurement of energy landscapes of intermolecular and interfacial interactions using atomic force microscopy. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/1853/58585.
Haider A. Direct measurement of energy landscapes of intermolecular and interfacial interactions using atomic force microscopy. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/58585
18. El Koussaifi, Rebecca. Statistique et dynamique ultra-rapides dans des expériences d'optique non linéaires fibrées : Ultra-fast statistics and dynamics in nonlinear fiber optics experiments.
Degree: Docteur es, Milieux dilués et optique fondamentale, 2017, Université Lille I – Sciences et Technologies
URL: http://www.theses.fr/2017LIL10125
Le travail de thèse présenté dans ce manuscrit est consacré à l'étude de la statis-tique et de la dynamique d'ondes partiellement cohérentes se propageant dans… (more)
Le travail de thèse présenté dans ce manuscrit est consacré à l'étude de la statis-tique et de la dynamique d'ondes partiellement cohérentes se propageant dans un milieunon linéaire, la fibre optique. Les études effectuées durant ce travail de thèse se placentprincipalement dans le champ de la turbulence intégrable qui examine la propagationnon linéaire d'ondes partiellement cohérentes dans des systèmes physiques décrits par deséquations intégrables telles que l'équation de Schrödinger non linéaire à une dimension.Nous avons reproduit en optique une expérience déjà réalisée en hydrodynamique.Nous comparons ainsi les déviations de la statistique gaussienne résultant de la propaga-tion non linéaire d'ondes lumineuses dans une fibre optique et de vagues dans un canalunidirectionnel. Afin d'observer la dynamique des ondes partiellement cohérentes se propageant dans unefibre optique en régime de dispersion anormale, nous avons construit un microscope tem-porel qui a permis d'observer des structures cohérentes particulières présentant des pro-priétés de localisation dans l'espace et dans le temps similaires à celles des ondes scélérates.Finalement, nous avons étudié le régime de propagation très faiblement non linéaire. Lathéorie cinétique des ondes (appelée encore théorie de la Turbulence d'ondes) prédit quel'élargissement spectral ne dépend pas du signe de la dispersion et nous avons présentédans ce manuscrit la preuve expérimentale de cette hypothèse.
The work presented in this thesis is related to the statistical and dynamical propertiesof partially coherent waves propagating inside an optical fiber. Our work mainly enterswithin the field of Integrable Turbulence that deals with nonlinear partially coherentwaves described by integrable equations, such as the one-dimensional nonlinear Shcrödin-ger equation. We have reproduced an experiment in optics that has been done some years ago inhydrodynamics. We compare the statistics of optical waves propagating inside an opticalfiber to the the statistics of waves propagating inside a water tank. Moreover we have built a time microscope in order to observe the real-time evolution of partially coherent waves. The soliton-like structures that have been observed in our expe-riments have localization properties in space and time that are similar to those typifyingrogue waves found in the field of oceanography. We have also examined the weakly nonlinear regime that can be described by using the so-called wave turbulence (WT) theory. WT theory states that the spectral broadening insuch a weakly nonlinear regime does not depend on the sign of the second-order dispersioncoefficient. In this thesis, we presented an experimental result confirming this theoreticalprediction.
Advisors/Committee Members: Randoux, Stéphane (thesis director), Suret, Pierre (thesis director).
Subjects/Keywords: Ondes partiellement cohérentes; Microscope temporel; 621.369 2
El Koussaifi, R. (2017). Statistique et dynamique ultra-rapides dans des expériences d'optique non linéaires fibrées : Ultra-fast statistics and dynamics in nonlinear fiber optics experiments . (Doctoral Dissertation). Université Lille I – Sciences et Technologies. Retrieved from http://www.theses.fr/2017LIL10125
El Koussaifi, Rebecca. "Statistique et dynamique ultra-rapides dans des expériences d'optique non linéaires fibrées : Ultra-fast statistics and dynamics in nonlinear fiber optics experiments." 2017. Doctoral Dissertation, Université Lille I – Sciences et Technologies. Accessed July 18, 2019. http://www.theses.fr/2017LIL10125.
El Koussaifi, Rebecca. "Statistique et dynamique ultra-rapides dans des expériences d'optique non linéaires fibrées : Ultra-fast statistics and dynamics in nonlinear fiber optics experiments." 2017. Web. 18 Jul 2019.
El Koussaifi R. Statistique et dynamique ultra-rapides dans des expériences d'optique non linéaires fibrées : Ultra-fast statistics and dynamics in nonlinear fiber optics experiments. [Internet] [Doctoral dissertation]. Université Lille I – Sciences et Technologies; 2017. [cited 2019 Jul 18]. Available from: http://www.theses.fr/2017LIL10125.
El Koussaifi R. Statistique et dynamique ultra-rapides dans des expériences d'optique non linéaires fibrées : Ultra-fast statistics and dynamics in nonlinear fiber optics experiments. [Doctoral Dissertation]. Université Lille I – Sciences et Technologies; 2017. Available from: http://www.theses.fr/2017LIL10125
19. Setiawan, Widagdo. Fermi Gas Microscope.
Degree: PhD, Physics, 2012, Harvard University
URL: http://nrs.harvard.edu/urn-3:HUL.InstRepos:9366602
Recent advances in using microscopes in ultracold atom experiment have allowed experimenters for the first time to directly observe and manipulate individual atoms in individual… (more)
Recent advances in using microscopes in ultracold atom experiment have allowed experimenters for the first time to directly observe and manipulate individual atoms in individual lattice sites. This technique enhances our capability to simulate strongly correlated systems such as Mott insulator and high temperature superconductivity. Currently, all ultracold atom experiments with high resolution imaging capability use bosonic atoms. In this thesis, I present our progress towards creating the fermionic version of the microscope experiment which is more suitable for simulating real condensed matter systems. Lithium is ideal due to the existence of both fermionic and bosonic isotopes, its light mass, which means faster experiment time scales that suppresses many sources of technical noise, and also due to the existence of a broad Feshbach resonance, which can be used to tune the inter-particle interaction strength over a wide range from attractive, non-interacting, and repulsive interactions. A high numerical aperture objective will be used to image and manipulate the atoms with single lattice site resolution. This setup should allow us to implement the Hubbard hamiltonian which could describe interesting quantum phases such as antiferromagnetism, d-wave superfluidity, and high temperature superconductivity. I will also discuss the feasibility of the Raman sideband cooling method for cooling the atoms during the imaging process. We have also developed a new electronic control system to control the sequence of the experiment. This electronic system is very scalable in order to keep up with the increasing complexity of atomic physics experiments. Furthermore, the system is also designed to be more precise in order to keep up with the faster time scale of lithium experiment.
Advisors/Committee Members: Greiner, Markus (advisor).
Subjects/Keywords: microscope; ultracold atoms; physics; optical lattice; Fermi
Setiawan, W. (2012). Fermi Gas Microscope . (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:9366602
Setiawan, Widagdo. "Fermi Gas Microscope." 2012. Doctoral Dissertation, Harvard University. Accessed July 18, 2019. http://nrs.harvard.edu/urn-3:HUL.InstRepos:9366602.
Setiawan, Widagdo. "Fermi Gas Microscope." 2012. Web. 18 Jul 2019.
Setiawan W. Fermi Gas Microscope. [Internet] [Doctoral dissertation]. Harvard University; 2012. [cited 2019 Jul 18]. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:9366602.
Setiawan W. Fermi Gas Microscope. [Doctoral Dissertation]. Harvard University; 2012. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:9366602
20. Kennedy, Scott Joseph. STIFFNESS CALIBRATION OF ATOMIC FORCE MICROSCOPY PROBES UNDER HEAVY FLUID LOADING .
Degree: 2010, Duke University
► This research presents new calibration techniques for the characterization of atomic force microscopy cantilevers. Atomic force microscopy cantilevers are sensors that detect forces on… (more)
▼ This research presents new calibration techniques for the characterization of atomic force microscopy cantilevers. Atomic force microscopy cantilevers are sensors that detect forces on the order of pico- to nanonewtons and displacements on the order of nano- to micrometers. Several calibration techniques exist with a variety of strengths and weaknesses. This research presents techniques that enable the noncontact calibration of the output sensor voltage-to-displacement sensitivity and the cantilever stiffness through the analysis of the unscaled thermal vibration of a cantilever in a liquid environment. A noncontact stiffness calibration method is presented that identifies cantilever characteristics by fitting a dynamic model of the cantilever reaction to a thermal bath according to the fluctuation-dissipation theorem. The fitting algorithm incorporates an assumption of heavy fluid loading, which is present in liquid environments. The use of the Lorentzian line function and a variable-slope noise model as an alternate approach to the thermal noise method was found to reduce the difference between calibrations preformed on the same cantilever in air and in water relative to existing techniques. This alternate approach was used in combination with the new stiffness calibration technique to determine the voltage-to-displacement sensitivity without requiring contact loading of the cantilever. Additionally, computational techniques are presented in the investigation of alternate cantilever geometries, including V-shaped cantilevers and warped cantilevers. These techniques offer opportunities for future research to further reduce the uncertainty of atomic force microscopy calibration. Advisors/Committee Members: Clark, Robert L (advisor), Cole, Daniel G (advisor).
Subjects/Keywords: Mechanical Engineering; Atomic force microscope; calibration
Kennedy, S. J. (2010). STIFFNESS CALIBRATION OF ATOMIC FORCE MICROSCOPY PROBES UNDER HEAVY FLUID LOADING . (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/3121
Kennedy, Scott Joseph. "STIFFNESS CALIBRATION OF ATOMIC FORCE MICROSCOPY PROBES UNDER HEAVY FLUID LOADING ." 2010. Thesis, Duke University. Accessed July 18, 2019. http://hdl.handle.net/10161/3121.
Kennedy, Scott Joseph. "STIFFNESS CALIBRATION OF ATOMIC FORCE MICROSCOPY PROBES UNDER HEAVY FLUID LOADING ." 2010. Web. 18 Jul 2019.
Kennedy SJ. STIFFNESS CALIBRATION OF ATOMIC FORCE MICROSCOPY PROBES UNDER HEAVY FLUID LOADING . [Internet] [Thesis]. Duke University; 2010. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/10161/3121.
Kennedy SJ. STIFFNESS CALIBRATION OF ATOMIC FORCE MICROSCOPY PROBES UNDER HEAVY FLUID LOADING . [Thesis]. Duke University; 2010. Available from: http://hdl.handle.net/10161/3121
21. Jiang, Yang. CHARACTERIZATION OF PORE STRUCTURES ON THE LOWER SILURIAN MARINE SHALE GAS PLAY.
Degree: Petroleum Engineering, Department of, 2014, University of Houston
► Gas shales are different from conventional reservoir as the strata are both source rock and reservoir rock for gas, and no structural or stratigraphic traps… (more)
▼ Gas shales are different from conventional reservoir as the strata are both source rock and reservoir rock for gas, and no structural or stratigraphic traps are needed to retain the gas. The recent advances in horizontal drilling and hydraulic fracturing stimulations have made vast shale gas resource commercially viable. However, due to the complex nature of gas storage, the quantification of shale gas reservoirs has been proven extremely challenging. Shale formation is usually extremely tight and the majority of the pores are nano-pores in which the diameters of the pores are in the range of several nanometers to tenth of nanometers. In this research, we propose to perform the numerical sensitivity study of nanopore structures on fluid flow. The proposed research will involve: Generation of 3-dimensional digital core of nano-pore structures based on the Scanning Electron Microscope (SEM) images of real core samples that are collected from the Longmaxi Formation - Lower Silurian Marine Shale Gas Play in Southern China. The results indicate that digital core is an efficient way to characterize the micropores structure of the shale formation parameters. Advisors/Committee Members: Qin, Guan (advisor), Lee, John (committee member), Holley, Thomas K. (committee member).
Subjects/Keywords: Shale; Digital Core; Scanning Electron Microscope
Jiang, Y. (2014). CHARACTERIZATION OF PORE STRUCTURES ON THE LOWER SILURIAN MARINE SHALE GAS PLAY . (Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/1404
Jiang, Yang. "CHARACTERIZATION OF PORE STRUCTURES ON THE LOWER SILURIAN MARINE SHALE GAS PLAY." 2014. Thesis, University of Houston. Accessed July 18, 2019. http://hdl.handle.net/10657/1404.
Jiang, Yang. "CHARACTERIZATION OF PORE STRUCTURES ON THE LOWER SILURIAN MARINE SHALE GAS PLAY." 2014. Web. 18 Jul 2019.
Jiang Y. CHARACTERIZATION OF PORE STRUCTURES ON THE LOWER SILURIAN MARINE SHALE GAS PLAY. [Internet] [Thesis]. University of Houston; 2014. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/10657/1404.
Jiang Y. CHARACTERIZATION OF PORE STRUCTURES ON THE LOWER SILURIAN MARINE SHALE GAS PLAY. [Thesis]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1404
22. Fan, Jingjing. Real-Time Monitoring Technology and Nanotechnology Applications on Different Environmental Scenarios.
Degree: Civil and Environmental Engineering, Department of, 2018, University of Houston
► Sensing technology has been widely applied in environmental oil detection. This research proposes for the first time the use of confocal laser fluorescence microscopy (CLFM)… (more)
▼ Sensing technology has been widely applied in environmental oil detection. This research proposes for the first time the use of confocal laser fluorescence microscopy (CLFM) as an enabling technology to quantify oil prior to produced water disposal. This method takes advantage of the self-fluorescing properties of oil to visualize and quantify in 3D oil droplets in water in real-time. This study initially involves the optimization of CLFM measurement parameters, followed by investigation of CLFM measurement accuracy and precision changes under various environmental condition. Interfacial tension analyses in combination with the Derjaguin, Landau, Verwey, and Overbeek (DLVO) calculation were employed to gain a better understanding of how environmental conditions affect oil droplets stability and therefore impact the precision of CLFM measurements. Finally, the quantification of oil content in three different real produced water samples were compared between CLFM and the EPA 1664 method. This technology has several advantages over other methods, such as solvent free and can be automated for real-time online applications. In addition of investigating CLFM as a sensing technology, this research also explores nanotechnology for environmental applications. We demonstrate for the first time that suspensions of single-layered MoS2 nanosheets can act as photocatalytic antimicrobial materials under visible light in the presence of electron donor. Ex-MoS2 with the presence of EDTA could inactivate 97% and 65% of planktonic and mature E.coli K12 biofilms, respectively, without significant cytotoxicity to mammalian fibroblast cells. The suspension of single-layered MoS2 nanosheets opens up new opportunities for the development of advanced functional nanomaterials for biomedical and environmental applications. In addition, the end of life fate of nanocomposites is also an important aspect to take into consideration for nanotechnology application. In this study, we investigate the ability of wastewater microorganisms to biodegrade nanocomposite films containing different graphene oxide (GO) loads embedded in a model biopolymer (i.e. chitosan). Results showed that microorganisms present in the activated sludge can grow on the surface of the nanocomposites and biodegrade the polymer surrounding the graphene oxide nanoplatelets. As the biopolymer gets degraded, there is increasing exposure of GO on the surface, which yields microbial inactivation and biofilm growth inhibition. Advisors/Committee Members: Rodrigues, Debora R (advisor), Rifai, Hanadi S (committee member), Vipulanandan, Cumaraswamy (committee member), Louie, Stacey (committee member), Willson, Richard C (committee member).
Subjects/Keywords: confocal microscope; produced water; graphene oxide; nanotechnology
Fan, J. (2018). Real-Time Monitoring Technology and Nanotechnology Applications on Different Environmental Scenarios . (Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/3499
Fan, Jingjing. "Real-Time Monitoring Technology and Nanotechnology Applications on Different Environmental Scenarios." 2018. Thesis, University of Houston. Accessed July 18, 2019. http://hdl.handle.net/10657/3499.
Fan, Jingjing. "Real-Time Monitoring Technology and Nanotechnology Applications on Different Environmental Scenarios." 2018. Web. 18 Jul 2019.
Fan J. Real-Time Monitoring Technology and Nanotechnology Applications on Different Environmental Scenarios. [Internet] [Thesis]. University of Houston; 2018. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/10657/3499.
Fan J. Real-Time Monitoring Technology and Nanotechnology Applications on Different Environmental Scenarios. [Thesis]. University of Houston; 2018. Available from: http://hdl.handle.net/10657/3499
23. Slováček, František. Realizace programovatelného posuvu mikroskopu v ose z .
► Tato práce pojednává o návrhu a realizaci programovatelného posuvu v ose Z. První kapitoly se zabývají pájeným spojem a jeho kontrolou. V dalších částech je… (more)
▼ Tato práce pojednává o návrhu a realizaci programovatelného posuvu v ose Z. První kapitoly se zabývají pájeným spojem a jeho kontrolou. V dalších částech je rozebráno řešení posuvu a programového vybavení. Poslední kapitola je věnována využití posuvu. V částech jsou popsány funkce, použité komponenty a zařízení.; This bachalor thesis discuss about realization of USB microscope programmable movement in axis Z. The first chapter desribes solder joint and its quality requirements and inspection. Description of the z-axis movement and software is demonstrated in next parts. The last chapter is devoted to the use of programmable movement. Function, components and equipment are described in details. Advisors/Committee Members: Starý, Jiří (advisor).
Subjects/Keywords: Mikroskop; posuv; programovatelný; Microscope; movement; programmable
Slováček, F. (2012). Realizace programovatelného posuvu mikroskopu v ose z . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/12120
Slováček, František. "Realizace programovatelného posuvu mikroskopu v ose z ." 2012. Thesis, Brno University of Technology. Accessed July 18, 2019. http://hdl.handle.net/11012/12120.
Slováček, František. "Realizace programovatelného posuvu mikroskopu v ose z ." 2012. Web. 18 Jul 2019.
Slováček F. Realizace programovatelného posuvu mikroskopu v ose z . [Internet] [Thesis]. Brno University of Technology; 2012. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/11012/12120.
Slováček F. Realizace programovatelného posuvu mikroskopu v ose z . [Thesis]. Brno University of Technology; 2012. Available from: http://hdl.handle.net/11012/12120
24. Amirsolaimani, Babak. Applications of Optics in Non-Traditional Biomedical Imaging .
► In this dissertation, three non-traditional applications of optics in biomedical imaging are presented. First, design and development steps of a new compact all-reflective multiphoton microscope… (more)
▼ In this dissertation, three non-traditional applications of optics in biomedical imaging are presented. First, design and development steps of a new compact all-reflective multiphoton microscope is described and illustrated. This design eliminates the adverse effects of chromatic aberration and dispersion inside the optical elements of the refractive-based microscopes. Additionally, in this mirror-based system, multiple laser sources with different wavelengths can be deployed for various three-dimensional imaging and writing applications. Second part presents a new approach to measure the visual acuity. This system uses the unique properties of tunable fluidic lenses and holographic optical elements to develop a handheld automatic phoropter. Using this setup, refractive error of the eye can be measured and corrected automatically within the range of -10 to +10 diopters. Moreover, no feedback is required from the patient and the measurement procedure can be completed within few seconds. Finally, the design and fabrication of an ultra-high sensitivity optical magnetometer is represented. The sensor is based on the Faraday rotation effect in nanocomposite polymers with high Verdet constants. This new sensing technique can substitute the expensive and high maintenance magnetometers that are currently being used in Magnetoencephalography (MEG) and Magnetocardiography (MCG) systems. Using this method high spatiotemporal mapping of biological activities can be achieved in an un-shielded environment. Advisors/Committee Members: Peyghambarian, Nasser (advisor), Norwood, Robert A. (committeemember), Peyman, Gholam (committeemember).
Subjects/Keywords: Magnetic sensing; Microscope; Optics; Phoropter; Refractive error
Amirsolaimani, B. (2018). Applications of Optics in Non-Traditional Biomedical Imaging . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/630219
Amirsolaimani, Babak. "Applications of Optics in Non-Traditional Biomedical Imaging ." 2018. Doctoral Dissertation, University of Arizona. Accessed July 18, 2019. http://hdl.handle.net/10150/630219.
Amirsolaimani, Babak. "Applications of Optics in Non-Traditional Biomedical Imaging ." 2018. Web. 18 Jul 2019.
Amirsolaimani B. Applications of Optics in Non-Traditional Biomedical Imaging . [Internet] [Doctoral dissertation]. University of Arizona; 2018. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/10150/630219.
Amirsolaimani B. Applications of Optics in Non-Traditional Biomedical Imaging . [Doctoral Dissertation]. University of Arizona; 2018. Available from: http://hdl.handle.net/10150/630219
25. Zhang, Fan. Modification of an ultra-high-vacuum scanning tunneling microscope for silicon nanostructure fabrication.
► In this thesis, two major modifications to an ultra-high-vacuum scanning tunneling microscope system are described: an update to the cooling plate structure for more effective… (more)
▼ In this thesis, two major modifications to an ultra-high-vacuum scanning tunneling microscope system are described: an update to the cooling plate structure for more effective cooling of the dipstick and sample holder, and the installation of a capillary doser for concentrating the precursor gas to the tip-ample junction during silicon nanostructure growth. The updated cooling plate is able to shorten the total sample preparation time from 6 hours to 3 hours. The capillary doser lowers the base pressure during the silicon growth experiment by two orders of magnitude. The system operation after the system modification was tested. The system is now ready for subsequent silicon nanostructure growth using disilane gas. Advisors/Committee Members: Lyding, Joseph W. (advisor).
Subjects/Keywords: scanning tunneling microscope (STM); silicon; nanostrucuture
Zhang, F. (2011). Modification of an ultra-high-vacuum scanning tunneling microscope for silicon nanostructure fabrication . (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/18461
Zhang, Fan. "Modification of an ultra-high-vacuum scanning tunneling microscope for silicon nanostructure fabrication." 2011. Thesis, University of Illinois – Urbana-Champaign. Accessed July 18, 2019. http://hdl.handle.net/2142/18461.
Zhang, Fan. "Modification of an ultra-high-vacuum scanning tunneling microscope for silicon nanostructure fabrication." 2011. Web. 18 Jul 2019.
Zhang F. Modification of an ultra-high-vacuum scanning tunneling microscope for silicon nanostructure fabrication. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2011. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/2142/18461.
Zhang F. Modification of an ultra-high-vacuum scanning tunneling microscope for silicon nanostructure fabrication. [Thesis]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/18461
26. Fuechsle, Martin Maximilian. Precision few-electron silicon quantum dots.
► We demonstrate the successful down-scaling of donor-based silicon quantum dot structures to the single donor limit. These planar devices are realized in ultra high vacuum… (more)
▼ We demonstrate the successful down-scaling of donor-based silicon quantum dot structures to the single donor limit. These planar devices are realized in ultra high vacuum (UHV) by means of scanning tunneling microscope (STM) based hydrogen lithography which – in combination with a gaseous dopant source and a thermal silicon source – allows for thepatterning of highly-doped planar Si:P structures with sub-nm precision encapsulated in a single-crystal environment.We present advancements of the alignment strategy for patterning ex-situ metallic contacts and top gates over the buried dopant devices. Here, we use a hierarchical array of etched registration markers. A key feature of the alignment process is the controlled formation of atomically flat plateaus several hundred nanometers in diameter that allows the active region of the device to be patterned on a single atomic Si(100) plane at a precisely knownposition.We present a multiterminal Si:P quantum dot device in the many-electron regime. Coplanar regions of highly doped silicon are used to gate the quantum dot potential resulting in highly stable Coulomb blockade oscillations. We compare the use of these all epitaxial in-plane gates with conventional metallic surface gates and find superior stability of the former.We highlight the challenges of down-scaling within a planar architecture and show how capacitance modeling can be used to optimize the tunability of quantum dot devices. Based on these results, we demonstrate the fabrication of an in-plane gated few-donor quantum dot device which shows highly stable Coulomb blockade oscillations as well as a surprisingly dense excitation spectrum on the scale of 100 μeV. We explain how these low energy resonances arise from transport through valley-split states of the silicon quantum dot providing extensive effective mass calculations to support our findings.Finally, we describe how STM H-lithography can be used to incorporate individual impurities at precisely known positions within a gated device and demonstrate transport through a single phosphorus donor. We find a bulk-like charging energy as well as clear indications for bulk-like excited states. We highlight the potential of this technology to realize elementary building blocks for future donor-based quantum computation applications in silicon. Advisors/Committee Members: Simmons, Michelle, Physics, Faculty of Science, UNSW.
Subjects/Keywords: Silicon; Scanning tunneling microscope; Quantum dots
Fuechsle, M. M. (2011). Precision few-electron silicon quantum dots . (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/51332 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10013/SOURCE02?view=true
Fuechsle, Martin Maximilian. "Precision few-electron silicon quantum dots." 2011. Doctoral Dissertation, University of New South Wales. Accessed July 18, 2019. http://handle.unsw.edu.au/1959.4/51332 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10013/SOURCE02?view=true.
Fuechsle, Martin Maximilian. "Precision few-electron silicon quantum dots." 2011. Web. 18 Jul 2019.
Fuechsle MM. Precision few-electron silicon quantum dots. [Internet] [Doctoral dissertation]. University of New South Wales; 2011. [cited 2019 Jul 18]. Available from: http://handle.unsw.edu.au/1959.4/51332 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10013/SOURCE02?view=true.
Fuechsle MM. Precision few-electron silicon quantum dots. [Doctoral Dissertation]. University of New South Wales; 2011. Available from: http://handle.unsw.edu.au/1959.4/51332 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10013/SOURCE02?view=true
27. Anema, Everet. Modeling and Estimation of the Volume of Interaction of an Electrostatic Force Microscope Probe with a Dielectric Sample.
Degree: Electrical and Computer Engineering, 2012, University of Manitoba
► This thesis seeks to characterize the size of the interaction volume in a sample subject to electric force microscope (EFM) probing. It discusses the historical… (more)
▼ This thesis seeks to characterize the size of the interaction volume in a sample subject to electric force microscope (EFM) probing. It discusses the historical relevance of the EFM and the experimental method used. It then discusses the modeling of the fields surrounding the grating sample with the equivalent charge model (ECM) where a tip or other rotationally symmetric conducting element is replaced by a series of point charges on the vertical axis that mimic the original fields. The results of the model were then compared to the experimental data as well as a model simulated using COMSOL, a finite element analysis package. The electrostatic model was found to have good agreement with the simulated and experimental results and was then used to estimate the volume of interaction and the lateral resolution of this technique. The volume of interaction was estimated at 6000 μm3 and the lateral resolution was estimated at 10 μm. Advisors/Committee Members: Oliver, Derek (Electrical and Computer Engineering) (supervisor), Buchanan, Douglas (Electrical and Computer Engineering), Morrison, Jason (Biosystems Engineering) (examiningcommittee).
Subjects/Keywords: Electrostatic Force Microscope; equivalent charge model
Anema, E. (2012). Modeling and Estimation of the Volume of Interaction of an Electrostatic Force Microscope Probe with a Dielectric Sample . (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/5221
Anema, Everet. "Modeling and Estimation of the Volume of Interaction of an Electrostatic Force Microscope Probe with a Dielectric Sample." 2012. Masters Thesis, University of Manitoba. Accessed July 18, 2019. http://hdl.handle.net/1993/5221.
Anema, Everet. "Modeling and Estimation of the Volume of Interaction of an Electrostatic Force Microscope Probe with a Dielectric Sample." 2012. Web. 18 Jul 2019.
Anema E. Modeling and Estimation of the Volume of Interaction of an Electrostatic Force Microscope Probe with a Dielectric Sample. [Internet] [Masters thesis]. University of Manitoba; 2012. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/1993/5221.
Anema E. Modeling and Estimation of the Volume of Interaction of an Electrostatic Force Microscope Probe with a Dielectric Sample. [Masters Thesis]. University of Manitoba; 2012. Available from: http://hdl.handle.net/1993/5221
28. Azimi, Wajma. Analyzing Intact Meiocytes of Wild-type Arabidopsis thaliana and Meiotic Mutants, ahp2 and spo11-2-2, using Confocal Microscopy.
Degree: 2013, University of Toronto
The purpose of this study was to assess the utility of confocal microscopy to examine nuclear organization and chromosome pairing for intact Arabidopsis male meiocytes.… (more)
The purpose of this study was to assess the utility of confocal microscopy to examine nuclear organization and chromosome pairing for intact Arabidopsis male meiocytes. The efficiency of the confocal technique was evaluated by analyzing wild-type nuclei throughout meiosis. Early-mid leptotene meiocytes demonstrated the presence of several propidium iodide stained signals within the nucleolus prior to the onset of chromosome pairing in zygotene. Pachytene chromosomes were completely paired and were traced to confirm the Arabidopsis karyotype. Additionally, the confocal technique was employed on meiotic mutants, ahp2 and spo11-2-2, to characterize their meiotic defects. Leptotene ahp2 meiocytes and zygotene meiocytes in both meiotic mutants appeared normal. In contrast, pachytene meiocytes in ahp2 and spo11-2-2 mutants demonstrated a wide-spread lack of paired chromosomes. Despite this general lack of pairing, a small amount of chromosome pairing was detected on the short arms of NOR-bearing chromosomes 2 and 4 in ahp2 and spo11-2-2 mutants.
Advisors/Committee Members: Hasenkampf, Clare, Cell and Systems Biology.
Subjects/Keywords: Arabidopsis; Confocal Microscope; ahp2; spo11; 0369
Azimi, W. (2013). Analyzing Intact Meiocytes of Wild-type Arabidopsis thaliana and Meiotic Mutants, ahp2 and spo11-2-2, using Confocal Microscopy . (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/35580
Azimi, Wajma. "Analyzing Intact Meiocytes of Wild-type Arabidopsis thaliana and Meiotic Mutants, ahp2 and spo11-2-2, using Confocal Microscopy." 2013. Masters Thesis, University of Toronto. Accessed July 18, 2019. http://hdl.handle.net/1807/35580.
Azimi, Wajma. "Analyzing Intact Meiocytes of Wild-type Arabidopsis thaliana and Meiotic Mutants, ahp2 and spo11-2-2, using Confocal Microscopy." 2013. Web. 18 Jul 2019.
Azimi W. Analyzing Intact Meiocytes of Wild-type Arabidopsis thaliana and Meiotic Mutants, ahp2 and spo11-2-2, using Confocal Microscopy. [Internet] [Masters thesis]. University of Toronto; 2013. [cited 2019 Jul 18]. Available from: http://hdl.handle.net/1807/35580.
Azimi W. Analyzing Intact Meiocytes of Wild-type Arabidopsis thaliana and Meiotic Mutants, ahp2 and spo11-2-2, using Confocal Microscopy. [Masters Thesis]. University of Toronto; 2013. Available from: http://hdl.handle.net/1807/35580
29. Hao, Jun. THE EFFECTS OF PHOSPHOLIPID COATING ON THE INHIBITION OF PYRITE OXIDATION UNDER BIOTIC AND ABIOTIC CONDITIONS.
URL: http://digital.library.temple.edu/u?/p245801coll10,29872
The abiotic oxidation of pyrite requires the supply of oxygen and water only. In abiotic systems, pyrite oxidation may proceed via several paths, with… (more)
The abiotic oxidation of pyrite requires the supply of oxygen and water only. In abiotic systems, pyrite oxidation may proceed via several paths, with multiple steps in each of the paths. Defect sites (S-deficient, Fe3+ bearing sites) on the pyrite surface have been shown reported to be the initial reaction sites on pristine pyrite surfaces. In neutral to slightly acidic solutions (3.5<pH<7), ferric iron hydroxide patches will form on the surface. These patches have been shown to be the predominant sites for electron exchange. Efforts were undertaken to suppress the electron transfer at these sites to inhibit pyrite oxidation. It has been shown that pyrite oxidation can be controlled by exposing the pyrite to phosphate under relatively high pH values (pH above 5.0). However, phosphate ceases to function as an inhibitor under lower pHs. The use of two-tail phospholipids instead of phosphate to inhibit the pyrite oxidation proved to be very effective under abiotic conditions. The purpose of the present study is to determine if the use of two-tail phospholipids can be extended to systems that have bacteria present. Batch experiments were conducted in which pyrite slurries were treated with two-tailed lipid either before or after exposure to bacteria. Iron release into the solution was used as a reaction progress variable and Atomic Force Microscopy was used to study the distribution of lipids and bacteria on the pyrite surface. AFM images showed that the formation of 7nm lipid bilayers contributes to the majority of lipid structures on pyrite surface. The bilayers render the pyrite surface hydrophobic and inhibit the reaction of water with the surface, which is known to be a critical reactant. AFM images also showed that phospholipids are capable of displacing a large fraction of bacteria attached to pyrite, reducing the oxidation rate of the mineral. However, addition of heterotrophic bacterial (Acidiphilum acidophilum) to the system resulted in the increase in pyrite oxidation rate again. Cross-linking of the 23:2 dyne phospholipids by exposing the lipid to UV light greatly enhanced the stability of the lipid in the presence of the heterotrophic bacteria. UV pretreated lipid layers reduced pyrite oxidation in the presence of heterotrophic bacteria for up to 30 days.
Temple University – Theses
Advisors/Committee Members: Strongin, Daniel R., Borguet, Eric, Nicholson, Allen W., Schoonen, Martin A. A..
Subjects/Keywords: Chemistry, Physical; Atomic Force Microscope; Cross-linking; Epifluorescence Microscope; Ferrozine Method; Lipid; Pyrite
Hao, J. (2009). THE EFFECTS OF PHOSPHOLIPID COATING ON THE INHIBITION OF PYRITE OXIDATION UNDER BIOTIC AND ABIOTIC CONDITIONS . (Doctoral Dissertation). Temple University. Retrieved from http://digital.library.temple.edu/u?/p245801coll10,29872
Hao, Jun. "THE EFFECTS OF PHOSPHOLIPID COATING ON THE INHIBITION OF PYRITE OXIDATION UNDER BIOTIC AND ABIOTIC CONDITIONS." 2009. Doctoral Dissertation, Temple University. Accessed July 18, 2019. http://digital.library.temple.edu/u?/p245801coll10,29872.
Hao, Jun. "THE EFFECTS OF PHOSPHOLIPID COATING ON THE INHIBITION OF PYRITE OXIDATION UNDER BIOTIC AND ABIOTIC CONDITIONS." 2009. Web. 18 Jul 2019.
Hao J. THE EFFECTS OF PHOSPHOLIPID COATING ON THE INHIBITION OF PYRITE OXIDATION UNDER BIOTIC AND ABIOTIC CONDITIONS. [Internet] [Doctoral dissertation]. Temple University; 2009. [cited 2019 Jul 18]. Available from: http://digital.library.temple.edu/u?/p245801coll10,29872.
Hao J. THE EFFECTS OF PHOSPHOLIPID COATING ON THE INHIBITION OF PYRITE OXIDATION UNDER BIOTIC AND ABIOTIC CONDITIONS. [Doctoral Dissertation]. Temple University; 2009. Available from: http://digital.library.temple.edu/u?/p245801coll10,29872
30. Mancini, Cédric. Mise en place d'un microscope confocal achromatique : Set up of an achromatic confocal microscope.
Degree: Docteur es, Physique, 2010, Université Claude Bernard – Lyon I
URL: http://www.theses.fr/2010LYO10254
L'étude des propriétés luminescentes de nanoparticules permet d'accéder à des informations sur les mécanismes élémentaires liés à cette luminescence. À l'instar de ce qui a… (more)
L'étude des propriétés luminescentes de nanoparticules permet d'accéder à des informations sur les mécanismes élémentaires liés à cette luminescence. À l'instar de ce qui a été fait pour les semiconducteurs (effets de confinement quantique par exemple), nous souhaitons étudier l'influence de paramètres tels que la taille ou la composition de nanoparticules isolantes sur leur luminescence. Pour cela il fallait créer un outil polyvalent capable d'exciter efficacement ces particules, d'en effectuer des images luminescentes et enfin d'en faire la spectroscopie. Le microscope confocal chromatique élaboré dans le cadre de mon travail de thèse et hébergé au sein de Nanoptec est à même de remplir ces objectifs : longueur d'onde d'excitation accordable allant de l'UV dur (210 nm) à l'IR (près de 1 μm), résolution spatiale de l'ordre du μm (permet l'étude de particules assez espacées), aspect confocal permettant d'isoler spatialement la luminescence de l'objet étudié, système de détection capable d'isoler spectralement cette luminescence... Cet outil a permis des collaborations diverses avec des équipes au sein et hors du laboratoire, comme la cartographie spatiale de la répartition de dopants dans des fibres laser, l'évaluation des inhomogénéités lumineuses au sein de matériaux céramiques, la mesure de dispersion spatiale de nanoparticules dans des plastiques... Le microscope confocal achromatique nous sert également à étudier plus fondamentalement les effets de la puissance d'excitation sur les propriétés luminescentes de nanoparticules de tailles et de compositions diverses.
Studying luminescent properties of nanoparticles leads to informations about elementary mechanisms connected to the luminescence. As it has been done for semiconductors (quantum confinement effect for instance), we want to evaluate the influence of parameters like size or composition of insulating nanoparticles on their luminescence. In this purpose, we had to develop a versatile tool, able to efficiently excite these particles, then perform their image and their spectroscopy. The achromatic confocal microscope built during my phD work and hosted in the Nanoptec center is able to fill these aims : tunable wavelenght from deep UV (210 nm) to IR (about 1 μm), spatial resolution of about 1 μm (enables us to work on sufficiently separated particules), confocal aspect leading to a spatial isolation of the studied object luminescence, detection system able to spectrally select this luminescence... We made various collaborations with teams in and out of the laboratory, such as spatial cartography of dopant distribution in laser fibers, evaluation of optical inhomogeneities amidst ceramics, spatial dispersion measurements of nanoparticles in plastics... The achromatic confocal microscope is also helpful for a better understanding of excitation power effects of luminescent properties of various sizes and compositions nanoparticles.
Advisors/Committee Members: Ledoux, Gilles (thesis director), Dujardin, Christophe (thesis director).
Subjects/Keywords: Microscope; Confocal; Nanoparticules; Resolution; Champ lointain; Microscope; Resolution; Confocal; Nanoparticles; Far field; 535
Mancini, C. (2010). Mise en place d'un microscope confocal achromatique : Set up of an achromatic confocal microscope . (Doctoral Dissertation). Université Claude Bernard – Lyon I. Retrieved from http://www.theses.fr/2010LYO10254
Mancini, Cédric. "Mise en place d'un microscope confocal achromatique : Set up of an achromatic confocal microscope." 2010. Doctoral Dissertation, Université Claude Bernard – Lyon I. Accessed July 18, 2019. http://www.theses.fr/2010LYO10254.
Mancini, Cédric. "Mise en place d'un microscope confocal achromatique : Set up of an achromatic confocal microscope." 2010. Web. 18 Jul 2019.
Mancini C. Mise en place d'un microscope confocal achromatique : Set up of an achromatic confocal microscope. [Internet] [Doctoral dissertation]. Université Claude Bernard – Lyon I; 2010. [cited 2019 Jul 18]. Available from: http://www.theses.fr/2010LYO10254.
Mancini C. Mise en place d'un microscope confocal achromatique : Set up of an achromatic confocal microscope. [Doctoral Dissertation]. Université Claude Bernard – Lyon I; 2010. Available from: http://www.theses.fr/2010LYO10254