text:
The centrifuge problem states that a centrifuge with some arbitrary number of test tubes in it must be radially balanced — that is, its center of mass must be in the center of the centrifuge. An unbalanced, spinning centrifuge will shake and "walk" across a desk like an unbalanced washing machine, and the vibrations caused by the unbalanced load will damage the spinning mechanism. So it is critical to balance it as well as possible, especially in very high-speed applications.
The specific problem given in the node Hard interview questions states that the centrifuge has 12 evenly spaced slots for test tubes, and that all the test tubes have equal mass. The solutions for 0, 2, 3, 4, and 6 tubes are trivial since they divide evenly into 12 and can therefore be evenly spaced. Likewise the solutions for 8, 9, 10, and 12 are exactly the same if you consider evenly spacing 0, 2, 3, or 4 empty slots rather than full slots.
Clearly the 1 and 11 test tube cases are not possible because there is nothing left with which to balance one and only one full or empty slot. This is also obvious and trivial.
However, the 5 and 7 test tube cases are nontrivial. 5 and 7 do not divide evenly into 12 and therefore cannot be evenly spaced around the centrifuge. Here is one possible arrangement which might work:
One commonly given proof that this arrangement is valid is that it is the superposition of two other valid arrangements, the solutions for 2 and 3. But this doesn't tell you anything if you don't understand superposition.
We can check to see if it is valid by calculating its center of mass. We can do this with basic trigonometry. If this arrangement is balanced both left to right and top to bottom, then it is balanced. Trigonometry allows us to find the horizontal and vertical components of each item's mass with respect to the center by drawing triangles. The hypotenuse of the triangle is the actual mass of the test tube and the horizontal and vertical legs represent the horizontal and vertical components of its mass.
First we see that the mass at C (slot 12) has only a vertical component. The masses at 3 and 9 likewise have only a horizontal component. So we only need triangles to find the horizontal and vertical components of 4 and 8. Recall the trigonometric identities:
sinθ = ---------- cosθ = ----------
Each slot represents 30° (360°/12). For convenience, let us assume the mass of each test tube is one (zero being an easier but far less interesting case). This sets the hypotenuse equal to 1, which therefore drops out of the equations, leaving us with:
Vertical components: Horizontal components:
sin(-30) = -1/2 cos(-30) = √3/2
sin(-150) = -1/2 cos(-150) = -√3/2
Now we add up all the vertical and horizontal components of the masses, defining up and right as positive.
C + 9 + 3 + 8 + 4 =
1 + 0 + 0 + (-1/2) + (-1/2) = 0 Balance!
C + 9 + 3 + 8 + 4 =
0 + (-1) + 1 + (-√3/2) + √3/2 = 0 Balance!
Therefore this solution is valid. The 7 test tube case is the same, just with the empty and full slots reversed.
In fact, this is only one valid solution to the problem. By running the math the same way, we see that any combination of any solution for 2 test tubes and 3 test tubes will work, so long as you don't try to put two test tubes in the same slot. For example, the case C, 4, 8, B, 5, although it looks unbalanced at first glance, still works:
C + 4 + 8 + B + 5 =
1 + (-1/2) + (-1/2) + √3/2 + (-√3/2) = 0 Balance!
C + 4 + 8 + B + 5 =
0 + √3/2 + (-√3/2) + (-1/2) + 1/2 = 0 Balance!
Really this is just the same case rotated 120 degrees. C, 4, 8, 1, 7 is the mirror image of that and also works. Superposition would have told us this immediately.
As mentioned earlier, the 5 test tube case is just the 2 and 3 test tube cases put together. Consider the cases separately. A valid 3 test tube case balances, so the center of mass doesn't need to be considered when looking at the 2 test tube case. Likewise a valid 2 test tube case balances, so its center of mass doesn't need to be considered when looking at the 3 test tube case. Each case completely drops out of the analysis of the problem because its center of mass is at the center, exactly where we need it to be.
Essentially, we are saying that two arrangements that each equal zero separately also equal zero when considered together.


text:
By Natalie Conrad
Herald Staff Writer
While the meaning and significance of Thanksgiving is widely known, to some students it is simply a fantasy.
Clinton High School teachers are making sure special education and at-risk students understand and appreciate the annual fall feast.
"How many kids actually have a Thanksgiving meal or know what it means?" Special Education Teacher Don LeRoux said.
Around 100 students, faculty and staff of Clinton High School gathered for a special Thanksgiving feast on Monday.
LeRoux started the event nine years ago and has led it each year with the help of generous colleagues.
"It's a great opportunity for all the kids to see each other and talk to different people," LeRoux said.
The feast starts with all the students saying what they are thankful for, which excludes material items.
Turkeys are provided by the district and all side dishes and desserts are brought in by staff. Home economics students also lend a hand in preparing buns and side dishes.
Leftover food is given to those in need and the Victory Center.
In order to partake in the feast, students must be in good standing academically and behaviorally.
"We make sure it's for the kids who really deserve it," LeRoux said. "It's all about positive role models and creating a tradition they will remember and continue into the future."

source: HuggingFaceFW/fineweb-edu


text:
Effects of Conventional and Virtual Reality Cardiovascular Rehabilitation in Body Composition and Functional Capacity of Patients with Heart Diseases: Randomized Clinical Trial
João Pedro Lucas Neves Silva
Luiz Felipe Marques Novaes
Lorrany Caroline Rocha dos Santos
Bianca Pinhal Galindo
Margaret Assad Cavalcante
Bruna Corral Garcia de Araújo
Francis Lopes Pacagnelli
Ana Paula Coelho Figueira Freire
Background: Virtual reality is an alternative therapeutic resource to be inserted into cardiovascular rehabilitation, stimulating the practice of physical activity through man-machine interaction.
Objective: To compare the effects of conventional and virtual reality cardiac rehabilitation on body composition and functional capacity in patients with heart disease.
Methods: Randomized clinical trial with 27 cardiac patients divided into conventional rehabilitation group (CRG) and virtual reality rehabilitation group (VRG). They underwent a rehabilitation program with 60-minute training sessions twice a week for eight weeks. The VRG training consisted of exercises from the Xbox 360® with Kinect™, using YourShape™ and Dance Central 3™ games. The CRG used conventional treadmills for aerobic exercise and free weights for resistance exercise. Bioimpedance and 6-minute walk test (6MWT) were evaluated at baseline and after training. For main outcome analysis, Student t and Mann Whitney tests were used with a 5% significance level.
Results: The VRG showed a significant increase in body fat percentage and fat weight when compared to the CRG, and a smaller amount of total water. There was a significant improvement in functional capacity evidenced by the increase in the distance covered in the 6MWT (54.00 m and 32.25 m in the CRG and VRG, respectively), but the gains did not differ between the groups.
Conclusion: The two rehabilitation modalities had no effect on the body composition of the groups. In addition, the improvement in functional capacity was similar in both groups. (Int J Cardiovasc Sci. 2018;31(6)619-629)
Keywords: Cardiovascular Diseases; Cardiac Rehabilitation; Physical Therapy Modalities; Body Composition; Virtual Reality Exposure Therapy.

source: openbmb/Ultra-FineWeb


text:
The following update is cross-posted at ACRL Insider.
ACRL's Framework Advisory Board (FAB) is excited to announce the launch of the ACRL Framework for Information Literacy Sandbox. The 'sandbox' that was first envisioned during the development of the Framework is now a reality.
The Sandbox is an openly accessible platform and repository for librarians and their educational partners to discover, share, collect and use ongoing work related to the ACRL Framework for Information Literacy for Higher Education in practice and professional development. The Sandbox is a dynamic resource whose content is created by contributors engaged in the Framework.
"ACRL's introduction of this innovative resource to support the needs of librarians engaging with the Framework in all types of academic settings is reflective of the association's strategic priorities," said ACRL President Irene M.H. Herold. "By providing opportunities for discovery and sharing of Framework-related instruction and professional development resources, the Sandbox will help build the capacity of librarians to advance the integration of information literacy into student learning. The Sandbox will only be as useful as the membership makes it, so all are encouraged to contribute."
In this platform, visitors can both browse and contribute by searching for materials tailored to their needs and contributing their own materials to share with others. The Sandbox will foster collaboration and networking as librarians discover examples to adapt and try out in their own settings and find others who are working on topics of mutual interest.
We invite you to jump into the Sandbox to share and learn from others. Searching is freely available for everyone – you don't need a login to start searching. And since the content of the Sandbox comes from you, the most important way you can celebrate the launch of the Sandbox is to contribute your Framework-related materials by creating a contributor account. Consult the Sandbox Help Center for information about how to get the most out of using the Sandbox.
The FAB Sandbox Project Team (Donna Witek, Susan Miller, and Sharon Mader) want to thank the Cherry Hill Company, ACRL Executive Director Mary Ellen Davis and the ACRL staff, and ALA ITTS for their collaboration and support in bringing this long-awaited resource to life.
See you in the Sandbox!


text:
1884 Drew Pocket Map of Florida
Description: An extremely scarce and important map of Florida drawn by Horace Drew in 1884. This highly uncommon map, the earliest known example of which was issued in 1867, is considered to be the only pocket map of Florida actually printed in Florida. The first edition of this map was printed by Columbus Drew from his offices in Jacksonville Florida and subsequently updated in an unknown number of editions into the 1880s. This example was printed by Horace Drew, son and successor to Columbus. It reflects the rapid and hopeful development of Florida through the middle and late 19 century, with numerous railways, roads, and canals noted.
Of particular note is the Lucie Canal, shown here leading from Lake Okeechobee to the Atlantic. This canal was part of a plan, supported by Drew, to drain the Everglades via a series of well placed water channels. Fortunately the Lucie canal was never built and the unique Everglades biosphere has been preserved for us to enjoy today.
Also of interest is the extensive notation in the lower left quadrant regarding the Florida Land Survey. Even in the late 19th century much of Florida remained federally administrated Public Land. It was the work of the Florida Land Survey, upon which this map is based, to plat out the land for sale to settlers. Drew's notations explain the process and how do identify land available for purchase. Drew additionally notes the sites of various important battles during the Seminole Wars.
Considered the Holy Grail of 19th century Florida cartography, this map is a must for any serious collection focusing on the American Southeast. Dated and copyrighted, "Entered according to Act of Congress in the year 1884 by Horace Drew, in the office of the Librarian of Congress, at Washington."
Date: 1884 (dated)
References: Rumsey, 5190.001 (1870 edition). Fitzgerald, 167 (1874 edition). Phillips, (maps) 285 (1874 edition). Library of Congress, Map Division, G3931.P3 1874.D7 RR 195. Baxter, J. M., Tequesta - An Annotated Checklist of Florida Maps, p. 115.
Cartographer: Columbus Drew (1820 - 1891) was a Florida physician, politician, writer, bookseller, publisher and printer active in the mid to late 19th century. Drew acquired a degree in medicine from Washington University in Baltimore before relocating to Florida to establish a practice in Jacksonville. Drew quickly became a leading citizen and, being an ardent Union Man, held the post of state Comptroller during the post Civil War Reconstruction. Drew was a leading figure in the development of Florida following the Civil War. His influence impacted the course and development of state railways, canals, drainage projects, and other civil world. Cartographically he is best known for the publication of his "New Map of the State of Florida", which, through numerous editions and revisions, chronicles the history and development of the state during a critical period. This map is now extremely scarce in any edition. Columbus Drew passed his publishing company to his son, Horace Drew, who continued to publish an update Drew's important map. The Drew family became leading citizens in Jacksonville and today their historic Victorian home enjoys landmark status. Click here for a list of maps by the Horace and Columbus Drew.
Size: Printed area measures 25 in height x 26 inches in width (63.5 x 66.04 centimeters)
Condition: Very good. Minor discolorations along original fold lines. Professionally removed from binder (included) and flattened.
Code: Florida-drew-1884 (to order by phone call: _PHONE_)
© Geographicus Rare Antique Maps, Kevin Brown, 19/6/2013


Product Details
- Contain:
1. 168 cards with different colours and characters. Each card consists of 2 HappiPlayground characters. There is a total of 8 characters namely Panda, Yani, Pucci, Pengi, Tiger, Bunni, Pinki and Elita.
2. An English and Chinese language guide
- Material: Paper
- Made with: Soybean Oil (an edible oil that can be fully integrated with the natural environment after decomposition; safe for children's use)
- Suitable for: 3 years old and above
- Diameter of each card: 7.4cm
- Made in Taiwan


text:
Variable CA13 : What was done to dispose of the stools
Valid case(s): 2293 (2258.7)
Invalid: 1545 (1570)
Children aged 0-4
Source of information
The mother or caretaker of the child aged 0-4.
|1||Child used toilet/latrine||210||252||11.2%|
|2||Put/rinsed into toilet or latrine||518||577||25.5%|
|3||Put/rinsed into drain or ditch||107||70||3.1%|
|4||Thrown into garbage (solid waste)||1369||1315||58.2%|
|6||Left in the open||37||5||0.2%|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.
Check UF11: Child aged under 3? Yes. Continue with CA13 No. Go to CA14
The last time (name) passed stools, what was done to dispose of the stools?
CA13 is used to filter out children aged 3, 4 and 5 years, since the next question is to be asked only of children under age three. Check UF11; if the child is under three (he/she is 0, 1 or 2 years old), mark the box corresponding to 'Yes' and continue with the next question. If the child is not under three (she/he is 3, 4 or 5 years old), mark the box corresponding to 'No' and skip to CA14. --- The purpose of this question is to know what was done with the most recent stools passed by the child in the household. The safe disposal of children's stools is of particular importance because children's stools are the most likely cause of faecal contamination to the immediate household environment. Correct disposal of stools is linked with lower risks of diarrhoea. Respondents are asked where they usually dispose of their children's stools if the child did not use the toilet facility. Circle the most appropriate code.


text:
Ireland says NO to 5G!
Petition to: The President of Ireland, The Honourable Michael D Higgins,
Taoiseach Michael Martin,
Minister for Communications, Climate Action and Environment, Éamon Ryan,
Minister for Health, Stephen Donnelly,
Minister for Education and Skills, Norma Foley, Minister for Business,
Enterprise and Innovation, Leo Varadkar,
Minister for Children, Disability, Equality and Integration Roderic O'Gorman,
Minister of State with Special Responsibility for Trade, Employment, Business, EU Digital Single Market and Data Protection,
Minister of State for Higher Education Simon Harris,
Minister of State for Communications, Climate Action and Environment, Éamon Ryan.
We, the undersigned people of Ireland and other supporters, are putting the Rialtas na hÉireann (Government of Ireland), and other decision-makers, on notice to NOT allow the roll-out of 5G (Fifth Generation) until further research has been done to establish the long term harmful and dangerous effects on our health from Electro Magnetic Frequencies, (EMF.)
The Irish Constitution, BUNREACHT NA hÉIREANN protects our fundamental rights as citizens of Ireland. In a landmark decision, in November 2017, Mr Justice Barrett said:
"A right to an environment that is consistent with the human dignity and well-being of citizens at large is an essential condition for the fulfilment of all human rights. It is an indispensable existential right that is enjoyed universally, yet which is vested personally as a right that presents and can be seen always to have presented, and to enjoy protection, under Article 40.3.1 of the Constitution. It is not so utopian a right that it can never be enforced."
The Council Of Europe in the Parliamentary Assembly in 2009, under the heading: Environment and Health: Better Prevention of EnvironmentRelated Health Hazards had this to say:
"Environment-related pathologies are not confined to respiratory and cardiovascular diseases or specific types of cancer but include other chronic and emerging pathologies such as immune system impairment, neurological and neurodegenerative illnesses and disruptions of the hormonal and reproductive system".
A global co-ordinated turnon is expected to go ahead, according to the European Union Commission website, on June 28th, 2020. (see links below)
Despite the European Parliament stating in a directive in 1999 that the 5G roll-out would be delayed until further research was done, the European Union Commission has decided to disregard all scientific evidence from 180 scientists, from 36 countries!
"We, the undersigned scientists, recommend a moratorium on the roll-out of the fifth generation, 5G, for telecommunication until potential hazards for human health and the environment have been fully investigated by scientists independent from industry. 5G will substantially increase exposure to radiofrequency electromagnetic fields (RF-EMF) on top of the 2G, 3G, 4G, Wi-Fi etc. for telecommunications already in place. RF-EMF has been proven to be harmful for humans and the environment."
They have instead decided to give a mandate to a 13- member non-profit private group, the ICNIRP, and the SCENIHR, to decide on the RF radiation guidelines. This, despite these two small organisations denying the existence of sound scientific published reports on the related risks of RF radiation. For those of you who are unaware of the dangers to you, your children, your parent's and everyone else's health, please read the following.
According to some scientists, EMFs can affect your body's nervous system function and cause damage to cells. Cancer and unusual growths may be one symptom of very high EMF exposure. Other symptoms may include:
- sleep disturbances, including insomnia
- depression and depressive symptoms
- tiredness and fatigue • dysesthesia (a painful, often itchy sensation)
- lack of concentration
- changes in memory
- loss of appetite and weight loss
- restlessness and anxiety
- skin burning and tingling
- changes in an electroencephalogram (which measures electrical activity in the brain)
Researchers found that people exposed to high levels of EMF for years at a time showed an increased risk of a certain type of leukemia in adults. European scientists also uncovered an apparent link between EMF and Leukemia in children. But they say that monitoring of EMF is lacking, so they're not able to draw any certain conclusions from their work, and more research and better monitoring is needed. A review of more than two dozen studies on low-frequency EMFs suggests these energy fields may cause various neurological and psychiatric problems in people. This study. Trusted Source found a link between EMF exposure and changes in human nerve function throughout the body, affecting things like sleep and mood. While electrical and electromagnetic fields in certain frequency bands have beneficial effects when applied in medicine, other non-ionising frequencies, be they sourced from extremely low frequencies, power lines or certain high-frequency waves used in the fields of radar, telecommunications and mobile telephony, appear to have more or less potentially harmful, non-thermal, biological effects on plants, insects and animals, as well as the human body when exposed to levels that are below the official threshold values.
The potential health effects of the very low frequency of electromagnetic fields surrounding power lines and electrical devices are the subject of ongoing research and a significant amount of public debate. In the past we waited for scientific and clinical proof with regards to asbestos, leaded petrol and tobacco and people were dying from the effects of these substances. We cannot wait for the same with regards to 5G. The high health and economic costs that might only manifest in the future, force us to insist, that until there is sufficient evidence that 5G is safe for humans, we demand that the 5G roll-out is halted. Scientists do not know enough about the effects of EMF exposure on human health therefore, more research must be done for citizens to be better informed.
Treating Multiple Chemical Sensitivities – Naturopathic ndnr.com/detoxification-medicine/treating-multiple-chemical-sensitivities/
PACE - Doc. 12608 (2011) - The potential dangers of assembly.coe.int/nw/xml/XRef/Xref-DocDetails-EN.asp?FileID=13137 EMF Exposure: Danger Levels, Symptoms, Protection, and More.
_URL_ 5G: European scientists warn of health risks (video) _URL_-scientists-warn-of-health-risks-video/
Sign this petition now!
Petition to: The President of Ireland - The Honourable Michael D Higgins - An Taoiseach Leo Varadkar - and 20 others


text:
Why Do Onions Burn Your Eyes
Why Do Onions Burn Your Eyes?
Onions are a staple ingredient in various cuisines around the world. They add flavor, texture, and aroma to a wide range of dishes. However, working with onions can be quite a challenge due to the irritating effect they have on our eyes. Many of us have experienced the uncomfortable burning sensation, tears streaming down our faces, and the struggle to finish chopping onions without resorting to wearing goggles. But why exactly do onions have this effect on our eyes?
The answer lies in the chemical compounds present in onions. When we cut, slice, or chop an onion, it releases a volatile gas called syn-propanethial-S-oxide. This gas reacts with the moisture in our eyes, forming a mild sulfuric acid. This acid irritates the nerve endings in our eyes, causing the familiar burning sensation and triggering our tear glands to produce tears in an attempt to wash away the irritant.
Onions contain a compound called alliin, which when cut or crushed, converts into other compounds that react with the syn-propanethial-S-oxide gas. The reaction produces a combination of sulfuric acid and other compounds that further intensify the irritation. Additionally, onions also release enzymes called lachrymatory factors when cut, which further contribute to the burning sensation.
Frequently Asked Questions (FAQs):
1. Can I prevent onions from making me cry?
Unfortunately, there is no foolproof method to completely prevent onions from making you cry. However, there are a few strategies that may help minimize the irritation. These include chilling the onions before cutting, cutting the onion under running water, or wearing goggles to protect your eyes.
2. Does the type of onion affect how much it makes you cry?
Different varieties of onions contain varying levels of sulfur compounds, which can influence the intensity of eye irritation. Generally, stronger-flavored onions, such as yellow onions, tend to cause more tears compared to milder varieties like sweet onions.
3. Can wearing contact lenses protect my eyes from onion fumes?
Wearing contact lenses may provide some barrier between your eyes and the onion fumes, but it is not a guaranteed solution. The gas can still reach your eyes, causing irritation and tearing.
4. Are there any health risks associated with cutting onions?
While cutting onions may cause temporary discomfort, there are no long-term health risks associated with it. The tears and irritation are merely a natural reaction to the compounds released by the onion.
5. Is it possible to eliminate the irritant gas from onions?
There are some genetically modified onions available that have reduced levels of the enzyme responsible for producing the irritant gas. However, these onions are not widely available and may not have the same flavor profile as traditional onions.
6. Does cooking onions reduce the eye irritation?
Cooking onions can lessen the eye irritation to some extent as heat breaks down the compounds responsible for the irritation. However, it is important to note that cooking onions for an extended period or at high temperatures can also cause eye irritation.
7. Are there any remedies to soothe irritated eyes after cutting onions?
Rinsing your eyes with cold water, applying a cold compress, or using over-the-counter eye drops can help soothe the irritation caused by cutting onions.
8. Can wearing goggles prevent onion-induced tears?
Yes, wearing goggles can create a barrier between your eyes and the onion fumes, preventing tears. However, it may not be a practical solution for everyone, especially when cooking in a professional kitchen.
9. Can people with sensitive eyes handle onions without tearing up?
People with sensitive eyes may find it more challenging to handle onions without tearing up. They can try the strategies mentioned earlier, such as chilling the onions or using goggles, to minimize the irritation.
10. Are there any alternative methods for cutting onions that don't cause tearing?
Some alternative methods include using a sharp knife to minimize crushing and releasing the irritant compounds, cutting onions near a running fan to disperse the gas, or using a food processor with a closed lid.
11. Why do some people seem less affected by cutting onions?
Individual differences in tear production and sensitivity to the irritant compounds in onions can influence how much someone is affected by cutting onions. Some people may naturally produce fewer tears or have a higher tolerance for the irritation.
12. Can onions have any positive effects on health despite their irritating nature?
Yes, despite their tendency to make us cry, onions offer numerous health benefits. They are rich in antioxidants, vitamins, and minerals, and have been linked to various health benefits, including improved heart health, reduced inflammation, and enhanced immune function.
In conclusion, the burning sensation and tears caused by cutting onions result from the release of syn-propanethial-S-oxide gas and the subsequent reaction with moisture in our eyes. While there is no guaranteed way to prevent this irritation, various techniques and strategies can help minimize its impact. Ultimately, the flavorful addition that onions bring to our meals makes enduring this temporary discomfort worthwhile.


text:
Silica Gel 100-200 mesh Fia grade
A gel is a solid jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels are defined as a substantially dilute cross-linked system, which exhibits no flow when in the steady-state. By weight, gels are mostly liquid, yet they behave like solids due to a three-dimensional cross-linked network within the liquid. It is the crosslinking within the fluid that gives a gel its structure (hardness) and contributes to the adhesive stick (tack). In this way gels are a dispersion of molecules of a liquid within a solid in which the solid is the continuous phase and the liquid is the discontinuous phase. The word gel was coined by 19th-century Scottish chemist Thomas Graham by clipping from gelatin.


text:
The installation of color laser printer is growing every year. More and more people use laser printer to print photography and disappoint in poor printing quality or paper jam. What is problem happening when using laser printer for photographic printing?
Basically, the color calibration of laser printer is based on common paper (80~100 gsm) before delivery. If increase paper thickness such as the paper of conventional development system is over 180 gsm, the color saturation will be reduced. How to increase both of paper thickness and color saturation at same time?
Slow down printing speed can take more time for toner transfer, avoid paper jam and increase color saturation. In the market, there are different types such as 4~5 ppm (pages per minute), 16 ppm and over 20 ppm. Fortunately, printing speed is possible to be controlled by selection icon of paper material. Recommend the setting of laser printer is 106~163 gsm to slow down printing speed!
Thank to the toner is negative polarity of almost laser printers. Use the paper with positive polarity for laser printing and it is possible to conduct more toner and increase color saturation as well.
Moisture tends to make pulp fibre expansion, raising paper thickness and uneven roughness. Coating skill perhaps is one of solutions to isolate moisture in air. Apply synthetic paper to replace pulp paper is a good alternative to resist moisture completely.
Many people recommend inkject glossy photo paper or premium paper for laser photographic printing. Be careful! The heating temperature of fuser can rise up to 200 degree C during printing. The potential risk of thermal stress is possible to melt-down the coating material of paper surface or crack happening. Particular, printing is operating at low speed. Thickness again! The thickness of those products is over 80~100 gsm.
Due to toner is dry powder in natural, the paper has no connection with resolution. The image resolution is decided by printer engine, toner dimension and printing language. 600 x 600 dpi can offer remarkable picture image quality. 1200 x 1200 and 2400 x 2400 dpi also increase more grades of gray level and improve better cubic effect.
Keep in mind! Toner is dry powder. Whatever your paper is high glossy or brightness, the surface of photo paper is covered by toner after printing. If it can present glossy, that means the toner density is not enough and the color of printing quality is very light. Actually, toner embraces wax inside and it can offer brightness after printer.
The testing had done with HP CLJ 2500/2550/5500/9500, EPSON Aculaser 900/1100/1900/3000/4000 and Konica Minolta magicolor 23xx. That means it is possible to overcome different printer engines for different printing speed, dpi, toner, fuser temperature and so on.
How To Print Photography By Laser Printer!
No replies to this topic
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users


Nourishing Ourselves evolved out of the Nourishing Our Children educational initiative founded and led by Sandrine Perez in order to focus on how we nourish ourselves as adults.
We are inspired by but not formally associated with the Weston A. Price Foundation, to teach the nutritional dietary wisdom of the healthy population groups that Dr. Weston A. Price discovered in the 1930's. We are developing a website and educational materials in order to answer this very question: what is a healthy diet? Meanwhile, you can get a sense of the dietary recommendations we promote here, as outlined the Weston A. Price Foundation.
Raine Saunders of Agriculture Society has joined Sandrine as a contributing partner and coauthor of Nourishing Ourselves.


HomeLifestyle5 Ways to Ensure Millennial Would Want to Dine in Your Restaurant
Popular Posts
5 Ways to Ensure Millennial Would Want to Dine in Your Restaurant
Restaurants around the world are doing everything they can to stay in business and stay ahead of the trends. At this point, it is hard to deny that millennials are the generation who are leading the food trends, as they eat out more, spend more of their income on dining experiences, and have a lot of opinions. Therefore, it makes sense that restaurants would want to attract this generation as their clientele.
If you are looking to bring more millennial diners into your establishment, read on for the five ways you can ensure that millennials want to dine in your restaurant.
1. Prioritize local food, sustainable practices.
If there is one thing that you can be sure of, millennials like to eat food that is grown locally and sustainably. After all, millennials care significantly about being conscious of the world and their impact on it. More than any generation before them, millennials care about the environment, which extends to the food they consume. Therefore, if you want them to eat in your restaurant, you need to show that you also care about the ingredients in your dishes and your environmental impact.
One of the ways to demonstrate this to millennials is by showing the origin of items on the menu. For example, if you are serving a lunch dish with eggs and bread, you can state that the eggs are from a particular local farm, the bread was baked in a local patisserie, and the condiments were made in small batches by a local company.
While these options may be more expensive, millennials have shown that they are willing to pay more for the ingredients that fit their perspective and lifestyle.
2. Have a wide array of beverages on offer.
In addition to your food offerings, you also want to consider your beverage menu carefully. Similar to their feelings toward food, millennials want to know where their beverages are coming from, and they are willing to pay more for healthier drinks produced locally.
For this reason, it is highly recommended that you work with mineral water suppliers in Dubai (or wherever you are located) so that you can offer them high-quality sparkling and still natural mineral water, as well as carbonated sparkling fruit beverages.
Furthermore, specialty coffee drinks and teas are popular with millennials who like to try beverages from around the world. For example, Darjeeling tea from India, pu erh tea from China, Qishir-spiced coffee from Yemen, and Hong Kong-style milk tea all have many millennial fans. Additionally, cappuccinos from Italy, Matcha from Japan, and cortados from Spain are all popular caffeinated beverages.
Millennials also enjoy mocktails and other non-alcoholic drinks. Some of the most popular mocktails for millennials include Virgin Daiquiris, Virgin Mint Lemonade, Pomegranate Spritzer, and a non-alcoholic Mojito.
3. Allow them to share plates.
Another dining trend that millennials love is small, sharing plates. These diners like to mix, match, and share what they have ordered, so they tend to prefer menus with a variety of small plates rather than single entrée sizes.
Millennials tend to love this style of dining because they're able to taste multiple dishes which works for their adventurous spirit that craves variety. This means that you can create a menu that is filled with smaller, higher-margin dishes.
Similarly, millennials like to sit at communal tables. This comes from the fact that they view dining out as an integral part of their social life. For this reason, they tend to eat in larger groups, which allows them to meet new people. Therefore, they like to be able to move around the table during the meal and want to ensure that everyone who is dining can interact with each other.
4. Provide them with an experience.
Known as the "experience generation," millennials live up to this stereotype, especially when it comes to their dining habits. Therefore, if you want to attract them to your restaurant, you need to provide them with something unusual. Whether that is funky interior design, a thought-provoking menu, photo-worthy dishes, or something else entirely, to catch their attention, it needs to be experiential.
Providing an experience is also good for business, as millennials are willing to pay a lot more for dining 'experiences' rather than just getting a meal. Even opting to host a game night, a themed evening, or live entertainment can do a lot to attract the diners you crave.
5. Have a social media and web presence.
For the generation that grew up with the internet, it is second-nature for millennials to quickly check out a restaurant's website or social media page before deciding to dine there.
In some cases, they will want to check out the menu; in other cases, they will want to see photos of the dishes and the interiors. If you do not have a social media and web presence, they are quickly going to move on to choosing to dine somewhere else.
Restaurants that recognize the importance of their social media and web presence can utilize it to reach a wider audience. By curating an aesthetic that looks pleasing across all platforms, you are positioning yourself to be in a better place to attract millennial diners.
What's more, if millennials like a restaurant, then they want to follow it and support it on social media platforms. In fact, research shows that millennials are more likely to be loyal to a restaurant that engages with them on social media.
Having a presence on social media is also a valuable marketing tool, as you can get free marketing by having your millennial diners share their experiences with their followers. In other words, restaurants that are lacking a social media presence are missing out on meaningful opportunities to connect with new millennial diners.
Are you a restaurant owner? If so, what steps are you taking to ensure that you can attract millennials? On the other hand, if you are a millennial diner, what do you look for in eating establishments? Let us know your thoughts and any relevant insights in the comments below!
AUTHOR BIO : Article contributed By
Recent Articles
opd health insurance
Health Insurance Plans with OPD Expenses Coverage Benefits
What is OPD Insurance Cover? OPD is an abbreviation of Out Patient Department, which is a new coverage, offered under the health insurance policies from...
Praval Pishti – Benefits, Dosage, Ingredients, Side Effects
Praval Pishti: Benefits, Uses, Dosage, Ingredients, Side Effects & How to Use
What is Praval Pishti? Made with coral calcium, Praval pishti is an Ayurvedic medicine used for the treatment of fever, cold, cough, pitta, ulcer, jaundice,...
Make Your Tech Move a Complete Success
Trans-locating your business is both exciting and challenging. It's a given that today's companies have a sizeable amount of tech (and its' connectivity) to...
Business Strategy Professionals: Setting the rules of the Game
When the topic of discussion, is based on the foundations of a Startup we need to keep in mind a little more than that,...
Tips to win your ex-girlfriend back this Valentine
It may be that the person had been with his girlfriend for quite some time and due to some reason or mistake, she may...
Latest Posts


text:
Non-native Birds in the Elfin Forest
(where to look for the species):
c = maritime chaparral
o = coast live oak woodland
t = transit – occasionaly feed on periphery of the Forest.
z = oak/manzanita complex
-● = non-native species which is or has the potential to negatively impact the natives species of the Elfin Forest.


Calculating polygon areas in QGIS?
 - How do I calculate areas of an area shapefile in square meters or in acres (ha)?
 I didn't find that functionality in the vector tools.
 - Stev_k
 Stev_k Correct answer
 8 years ago
 Make the layer editable, then use the field calculator (Layer>Open attribute table>Field Calculator/Ctrl+I or right click shapefile>Open attribute table>Field Calculator/Ctrl+I). There is an operator "$area" that will calculate the area of each row in the table. All units will be calculated in the units of the projection, so you probably want to project it to a projection that uses feet or metres before doing that, rather than lat/lon.
 In current versions of QGIS if your data is in a Geographic CRS you can use the function transform() to project the geometries to a projected system (Preferably an equal area one) without the need to duplicate your data. In the Field calculator, something like this should work: area($geometry, 'EPSG:4326','EPSG:3763')
 _USER_: Do you mean 'area(transform($geometry, 'EPSG:4326','EPSG:3763'))'?
 _USER_ yes, my mistake.
 - This can also be done with Vector|Geometry Tools|Add/export geometry columns, which creates a new shapefile with area and perimeter (or length) columns added.
 Edit: (using the tool above, you can also unselect "save as new shape-file" in V1.8, the shapefile is now only updated!)
 Using the field calculator is probably a better idea, though, as it doesn't require the creation of a new shapefile.
 You can't change the attributes of the shapefile without enabling editing first, (calculating area counts as editing the attributes, you are adding a new column). Keep in mind that all units will be calculated in the units of the projection (meters bu default), so you to re-project it to a projected coordinate system first.
 - I wrote a script specifically for this. If you don't want to reproject your data, you can compute the area using ellipsoidal math.
 Processing Toolbox -> Tools -> Get scripts from on-line scripts collection -> Ellipsoidal Area
 You will find the script installed in Processing Toolbox -> Utils -> Ellipsoidal area
 The tool should be self explanatory and will allow you to calculate area in units of your choice regardless of projection.
 Can you give better example as code?
 - If the areas you are looking at are liable to change, such as looking at infrastructure layouts, catchment areas, study areas etc, I find it useful to simply label the areas, instead of adding them as attributes.
 Label-> round($area/10000,2)||' ha'
 This way you don't need to remember to update the catchment areas in the attribute tables as often.
 won't this save your values as strings? I would advise against saving numerical data as strings and instead include the area unit in the field name.
 - If not getting very accurate area calculations does not bother you (or if you do not want to play with different options in the field calculator as mentioned by some of the answers and comments above), in the current version of QGIS (i.e., QGIS 3.12) there is an easy way to deal with this. Go to "Project >> Properties >> General" and change the units for distance and area measurements. Now $area in the field calculator automatically transform the CRS for area (and for other geometric calculations if that matters).
 However, I personally recommend doing the method by _USER_ as it will give you more accurate results. Though you have to do a little search that what will be the 3rd parameter of transform function, i.e., most suitable CRS for your area of interest and its units.
 enter image description here
License under CC-BY-SA with attribution
Content dated before 6/26/2020 9:53 AM
Tags used


text:
Does Cultural Sensitivity Matter to Maintaining Business Relationships in the Export Markets?: An empirical investigation in the Norwegian seafood industry
MetadataShow full item record
The aim of this study is twofold. The first aim is to develop the cultural sensitivity concept. A review of literature, including literature focusing on international business, marketing, and adaptive selling, has provided the basis from where the cultural sensitivity concept has been developed. This study proposes a model of the concept as multi-dimensional. Cultural sensitivity is perceived as a competence, held by a person responsible for sales in the export markets. Experience is viewed as essential to advance a salesperson's cultural sensitivity. The dimensions, and thus the variables composing cultural sensitivity, are as follows: international experience, country experience, open-mindedness, adaptive business style, and ongoing business experience. The measurement scales were adopted from previous research, but were accommodated to the context studied. The second aim of this study is to investigate the extent to which the various dimensions of cultural sensitivity are important to the maintaining of business relationships in export marketing channel contexts. The empirical setting is the Norwegian seafood export industry with selected business partners in the export markets. The sample consists of 111 cases, and regression analyses were conducted to test 12 hypotheses. The conceptual model proposes that the five variables that compose cultural sensitivity have different roles. International experience, country experience and open-mindedness are hypothesised to have an impact on relational qualities (trust between exchange partners and exchange of information) indirectly through adaptive business style. The findings give support to this view. These three variables do not have significant effects on trust and exchange of information directly. The findings show that country experience and open-mindedness have positive and significant effects on an adaptive business style. The findings show that adaptive business style does not have a significant impact on trust between exchange partners. Adaptive business style has a significant impact on exchange of information, though only at a p <.10 level. Ongoing business experience is viewed as a moderator variable. It is expected to strengthen the relationship between adaptive business style and trust, and the relationship between adaptive business style and exchange of information. The results show that the former relationship is strengthened from a non-significant to a significant relationship. The significance is though only at a p <.10 level.
SeriesSeries of Dissertations


Take the 2-minute tour ×
I recently wrote the following sentence:
Please roll it back.
But if I were to describe the action on its own I would say:
This rollback was due to objections by the original author.
If I want to use "rollback" as a verb I have to split it up with an "it". My best guess is that "rollback" seems to be a compound noun birthed from a verb+adverb but we never got a verb compound form. Thus, the following is still incorrect:
Please rollback it.
Is there a term to describe the specific pair of "roll" and "back"? Describing this specific action will always need both words and the action itself now has an appropriate noun. But where did the combined verb form go?
share|improve this question
This is the way that English works. Nouns combine; verbs stay separate. Your car can have a breakdown, but you don't say "my car breakdowned", you say "my car broke down". Similarly, you can't say "I breakupped" with my girlfriend, or "I am loginning" to my computer, even though you and your girlfriend have a breakup, and you have a login for your computer. – Peter Shor Feb 28 '14 at 23:26
4 Answers 4
up vote 13 down vote accepted
Roll back is a standard phrasal verb. Roll is the verb part, and back is the particle.
Rollback (stress on first syllable) is an event nominalization from roll back (stress on second).
As a phrasal verb, roll back participates in the usual alternation with direct objects:
 - Roll the carpet/budget back. (Vb + Noun DO + Particle -- OK)
 - Roll back the carpet/budget. (Vb + Particle + Noun DO -- OK)
 - Roll it back. (Vb + Pronoun DO + Particle -- OK)
 - *Roll back it. (Vb + Particle + Pronoun DO -- NOT OK)
So there are two reasons why *rollback it is incorrect:
 1. rollback is a noun derived from roll back, and not a verb itself, so it can't take a direct object.
 2. roll back is a phrasal verb and must place pronoun direct objects between verb and particle.
share|improve this answer
It could work if you were turning something into a rollback, but that doesn't compute. If you are calling rake db:rollback, you're rolling the most recent migration back. rollback is a command to something. Like "hey, your changes broke the db, everyone roll back!!" In this case, it is yet another tech term, in this case, telling someone to roll back means run rake db:rollback. If someone had mis typed rake db:redo, but instead you wanted them to rollback, you could point to redo and say "rollback it", referring to turn redo into rollback. – Funkodebat Mar 1 '14 at 2:09
_USER_ I didn't understand a word you said. Are you a computer programmer? – Mari-Lou A Mar 1 '14 at 6:12
He means that it has a very specific (and extreme) meaning and context in information management. rollback is the name of a command (and therefore, a program that the command calls). This is on a command-line interface where all the commands are imperative verbs, and there is a convention that pronounced names can be used as verbs in speech. In this case, they are reified and don't follow the syntax of phrasal verbs, so that "rollback it" has a context and a meaning, and is not ungrammatical. This is how language changes; new environments, new adaptations. – John Lawler Mar 1 '14 at 16:12
I'm a RoR programmer myself. rollback is indeed the name of a command. But it does not immediately qualify it as a new verb with its own new rules separate from the verb "to roll back". Even if a term is added to the dictionary, it doesn't change grammar rules just because its meaning is specialised. There are furry mice in my house, computer mice on my desk, chocolate mice in my bag, and the Mice Galaxies in space. Likewise, it is bad grammar to say "We rollbacked the database last night." Instead, say "We rolled back the database." or "We rolled the database back." – Seth Jeffery Jun 29 at 9:33
According to the Google dictionary (though not as yet AHD or Collins), the word rollback is also a compound verb (sense (1) here ):
verb: rollback; 3rd person present: rollbacks; past tense: rollbacked; past participle: rollbacked; gerund or present participle: rollbacking; verb: roll-back; 3rd person present: roll-backs; past tense: roll-backed; past participle: roll-backed; gerund or present participle: roll-backing
 1. restore (a database) to a previously defined state.
It is such a recent development from roll + back that 'rollback it' sounds unnatural. 'Rollback X' (X a noun group other than a pronoun) sounds like 'roll back X' which isn't so outlandish. Almost certainly, 'rollback it' will become more common, especially with padding: 'rollback it to the last-but-one state'.
Compound verbs from the fusion of verb + adverb are usually head-second:
downsize; upgrade; outsource; input; overpay
– so the addition of an object, including it, doesn't sound too bad.
It appears that 'voiceover / voice-over' has been analogously verbed.
share|improve this answer
Ah, interesting. So the answer to my question is most likely, "It is too soon. Wait a little longer." Your other examples of compound verbs are really useful. +1. – MrHen Feb 28 '14 at 23:54
_USER_ Derivations like these are very slow to catch on because so many people object to them. A few like loginned / loginning have been making progress, but they're widely disparaged. They may never be accepted. – snailboat Mar 1 '14 at 3:51
'Stopover' has made it into Collins (though not AHD) as a verb. But this is intransitive and doesn't give rise to a weird-sounding pairing with 'it'. With 'rollback it', there is the strong influence of the correct-sounding (and of course correct) (apologies to the 'of course' 'patronising'-labeller – who has been known to add it himself; I think this would sound more pedantic without it) 'roll it back' (whether transitive multi-word verb or verb + DO + adverb). Here, 'roll back it' is ungrammatical, so 'rollback it' also sounds unnatural. – Edwin Ashworth Mar 1 '14 at 9:29
"Rollback" is the name of the operation done when you "Roll [a file] Back" to an earlier version. (Usually this is as a part of a change management system).
It isn't a verb. It is a noun made from a verb already. There's no sense in verbifying the noun obtained from nounifying a verb. What would happen when you described that? You could repeat forever.
You either "perform a Rollback Operation or you Roll the file back and call the action Rollback.
share|improve this answer
Revert might be a suitable alternative to rollback in your example.
Please revert it.
share|improve this answer
I wasn't really looking for alternatives but yes, you are correct. – MrHen Feb 28 '14 at 23:54
Your Answer


text:
Everything you need to understand or teach When Hitler Stole Pink Rabbit by Judith Kerr.
Judith Kerr's WHEN HITLER STOLE THE PINK RABBIT is a semi-autobiographical story about a nine year-old Jewish girl named Anna who lives with her family in Berlin just as the Nazis are rising to power in Germany. Anna has an older brother named Max. Her mother, just called "Mama," is a well-to-do housewife and her father, "Papa," is a famous writer and prominent critic of the Nazi regime and the Nazi party. The story is about the family's flight from the Nazis, who have put a price on Anna's father's head since he is one of their critics. The family moves from Weimar Germany to Switzerland, then to France and ends up in England, because Papa cannot find work in countries influenced by the Nazis, since they refuse to publish his work. The notable feature of the book, however, is that the complexities of pre-war European politics are seen through... View more of the When Hitler Stole Pink Rabbit Summary
When Hitler Stole Pink Rabbit Lesson Plans contain 123 pages of teaching material, including:


text:
Nuclear Science and Engineering / Volume 166 / Number 2 / October 2010 / Pages 134-144
Technical Paper / _URL_.13182/NSE09-87
The area ratio method of Sjöstrand is generally considered one of the most reliable reactivity determination methods and thus is a major candidate for off-line calibration purposes in future accelerator-driven systems for high-level waste incineration. In this work, the Sjöstrand area ratio method has been evaluated experimentally under thorough conditions in the strongly heterogeneous subcritical facility YALINA-Booster. Both strengths and weaknesses of the method have been identified. Most surprisingly, it has been found that the area ratio reactivity estimates may differ a factor of 2 depending on detector position. It is also shown that this strong spatial dependence can be explained based on a simple two-region point-kinetics model and corrected by means of correction factors obtained through Monte Carlo simulations. A new Monte Carlo correction method is proposed that includes, at the same time, the spatial disturbance and the effective delayed neutron fraction. In that way, the value of the effective multiplication factor is obtained from the measured dollar reactivity without the need of calculating the effective delayed neutron fraction explicitly, and thereby, the delayed neutron transport is performed only once. Further, it has been found that the Sjöstrand area ratio method is not sensitive to perturbations of the source multiplication factor.


text:
The persistence phenomenon is studied in a financial context by using a novel mapping of the time evolution of the values of shares in a portfolio onto Ising spins. The method is applied to historical data from the London Financial Times Stock Exchange 100 index (FTSE 100) over an arbitrarily chosen period. By following the time dependence of the spins, we find evidence for a power law decay of the proportion of shares that remain either above or below their 'starting' values. As a result, we estimate a persistence exponent for the underlying financial market to be. Preliminary results from computer simulations on persistence in the economic dynamics of a toy model appear to reproduce the behaviour observed in real markets.
|Number of pages||6|
|Publication status||Published - 2007|


text:
Definition of citral in English:
noun[mass noun] Chemistry
A fragrant liquid occurring in citrus and lemongrass oils and used in flavourings and perfumes.
- An example of counteraction is mixing citral, a pale-yellow liquid used in the perfume and flavoring industries, to neutralize the amines emitted from decaying meat in the dumpster behind a restaurant.
- Odors used included amyl acetate, which smells like bananas; phenyl ethyl alcohol, which smells like roses; propionic acid, which smells like vinegar; eugenol, which smells like cloves; and citral, which smells lemony.
- A tall, vigorous plant with light green leaves, small white flowers and an intense lemon aroma, it has been bred for greater genetic uniformity and higher content of the lemon-scented oil citral.
Definition of citral in:
- US English dictionary
What do you find interesting about this word or phrase?
Comments that don't adhere to our Community Guidelines may be moderated or removed.
Most popular in the UK
Most popular in Canada
Most popular in Australia
Most popular in Malaysia
Most popular in Pakistan


text:
- by VM85 Jan 5, '09what does r/t mean?
Print and share with friends and family.
Compliments of allnurses.com.
_URL_ allnurses.com INC. All Rights Reserved.
- 10,423 Views
- Jan 5, '09 by jeninthedesert"related to"
It's part of the nursing diagnosis.
- Jan 5, '09 by Daytonitelet me also add that the "related to" or "r/t" part of the nursing diagnostic statement is the etiology, or cause, of the nursing diagnosis (nursing problem). the construction of nursing diagnostic statements consists of two or three parts linked by these shorthand abbreviations to save space. this is how your nursing instructors will require you to diagnose nursing conditions in your patients. later as a licensed nurse on a job you will see and write care plans using these abbreviations. here is an example:
- acute pain r/t surgical intervention aeb complaint of abdominal pain of 8 on a scale 10 and keeping the legs drawn up to the chest
- acute pain related to surgical intervention as evidenced by complaint of abdominal pain of 8 on a scale 10 and keeping the legs drawn up to the chest
- problem: acute pain - this is the nursing problem that was identified by the nurse and has been stated as a nanda nursing diagnosis
- etiology (cause): surgical intervention - the cause of the problem is being told to us was that the patient was cut into surgically (that is what the words "surgical intervention" mean)
- symptoms: (1)complaint of abdominal pain of 8 on a scale 10, (2) keeping the legs drawn up to the chest - this is the evidence that the nurse collected through their assessment of the patient that proves and supports that pain exists
- Jan 5, '09 by DIVA_NURSE405As my nursing instructor told me R/T is something u as a nurse can fix!


Take the 2-minute tour ×
We have two functions:
$$\begin{align*} y &= x^4-5x^3+2x^2-5 \\ y &= -11x-20 \end{align*}$$
My task is to find two closest points that can be found on these two functions.
Can somebody give any hints on how to solve these type of exercises?
Thank you!
share|improve this question
Do you mean the closest points of the curves, or the minimum difference between the two functions? – copper.hat Feb 8 '13 at 8:17
The minimum difference between the two functions. :) – Trom Feb 8 '13 at 8:23
add comment
2 Answers
up vote 2 down vote accepted
You want to minimize $x^4-5 x^3+2 x^2+11 x+15$. Take the derivative, set that to $0$, and solve. Unfortunately this is an irreducible cubic, so the solutions are not very nice. There are three real roots: approximately $-._PHONE_$, $1.275428188$, $3.157446070$. I'll leave it to you to find which of these gives the minimum.
share|improve this answer
add comment
Since you want the minimum difference between $$\begin{align*} y_1(x) &= x^4-5x^3+2x^2-5 \text{ and }\\ y_2(x) &= -11x-20 \end{align*}$$ you are looking for the minimum of $$ \left| y_1(x) - y_2(x) \right|$$ which will be a max / min of $$ z(x) = y_1(x) - y_2(x).$$ So write down the equation for $z$ as Robert Israel has done for you, differentiate $z$ and find its turning points.
share|improve this answer
add comment
Your Answer


Documentation Center
 - Trial Software
 - Product Updates
Graph legend for lines and patches
legend_handle = legend(...)
[legend_h,object_h,plot_h,text_strings] = legend(...)
The legend function places a legend on various types of graphs (line plots, bar graphs, pie charts, etc.). For each line plotted, the legend shows a sample of the line type, marker symbol, and color beside the text label you specify. When plotting filled areas (patch or surface objects), the legend contains a sample of the face color next to the text label.
The font size and font name for the legend strings match the axes FontSize and FontName properties.
legend('string1','string2',...) displays a legend in the current axes using the specified strings to label each set of data.
legend(h,'string1','string2',...) displays a legend on the plot containing the objects identified by the handles in the vector h and uses the specified strings to label the corresponding graphics object (line, barseries, etc.).
legend(M) adds a legend containing the rows of the matrix or cell array of strings M as labels. For matrices, this is the same as legend(M(1,:),M(2,:),...).
legend(h,M) associates each row of the matrix or cell array of strings M with the corresponding graphics object (patch or line) in the vector of handles h.
legend(M,'parameter_name','parameter_value',...) and legend(h,M,'parameter_name','parameter_value',...) allow parameter/value pairs to be set when creating a legend (you can also assign them with set or with the Property Editor or Property Inspector). M must be a cell array of names. Legends inherit the properties of axes, although not all of them are relevant to legend objects.
legend(axes_handle,...) displays the legend for the axes specified by axes_handle.
legend('off') removes the legend in the current axes.
legend(axes_handle,'off') removes the legend in the axes specified by axes_handle.
legend('toggle') toggles the legend visibility. If a legend does not exist, then one is created using default strings. If a legend exists, then toggling its state to invisible does not remove the legend.
legend(axes_handle,'toggle') toggles the legend visibility in the axes specified by axes_handle.
The default string for an object is the value of the object's DisplayName property, if you have defined a value for DisplayName (which you can do using the Property Editor or calling set). Otherwise, legend constructs a string of the form data1, data2, etc. Setting display names is useful when you are experimenting with legends and might forget how objects in a lineseries, for example, are ordered.
When you specify legend strings in a legend command, their respective DisplayNames are set to these strings. If you delete a legend and then create a new legend without specifying labels for it, the values of DisplayName are (re)used as label names. Naturally, the associated plot objects must have a DisplayName property for this to happen: all _series and _group plot objects have a DisplayName property; Handle Graphics® primitives, such as line and patch, do not.
Legends for graphs that contain groups of objects such as lineseries, barseries, contourgroups, etc. created by high-level plotting commands such as plot, bar, contour, etc., by default display a single legend entry for the entire group, regardless of how many member objects it contains. However, you can customize such legends to show individual entries for all or selected member objects and assign a unique DisplayName to any of them. You control how groups appear in the legend by setting values for their Annotation and DisplayName properties with code. For information and examples about customizing legends in this manner, see Control Legend Content in the MATLAB® Graphics documentation.
You can specify EdgeColor and TextColor as RGB triplets or as ColorSpecs. You cannot set these colors to 'none'. To hide the box surrounding a legend, set the Box property to 'off'. To allow the background to show through the legend box, set the legend's Color property to 'none', for example,
set(legend_handle, 'Box', 'off')
set(legend_handle, 'Color', 'none')
This is similar to the effect of the command legend boxoff, except that boxoff also hides the legend's border.
You can use a legend's handle to set text properties for all the strings in a legend at once with a cell array of strings, rather than looping through each of them. See the last line of the example below, which demonstrates setting a legend's Interpreter property. In that example, you could reset the String property of the legend as follows:
See the documentation for Text Properties for additional details.
legend('hide') makes the legend in the current axes invisible.
legend(axes_handle,'hide') makes the legend in the axes specified by axes_handle invisible.
legend('show') makes the legend in the current axes visible. A legend is created if one did not exist previously. Legends created automatically are limited to depict only the first 20 lines in the plot; if you need more legend entries, you can manually create a legend for them all with legend('string1','string2',...) syntax.
legend(axes_handle,'show') makes the legend in the axes specified by axes_handle visible.
legend('boxoff') removes the box from the legend in the current axes and makes its background transparent.
legend(axes_handle,'boxoff') removes the box from the legend in the axes specified by axes_handle and makes its background transparent.
legend('boxon') adds a box with an opaque background to the legend in the current axes.
legend(axes_handle,'boxon') adds a box with an opaque background to the legend in the axes specified by axes_handle.
You can also type the above six commands using the syntax
legend keyword
If the keyword is not recognized, it is used as legend text, creating a legend or replacing the current legend.
legend_handle = legend(...) returns the handle to the legend on the current axes, or [] if no legend exists.
legend(...,'Location','location') uses location to determine where to place the legend. location can be either be a 1-by-4 position vector ([left,bottom,width,height]) or one of the following strings.
SpecifierLocation in Axes
Inside plot box near top
Inside bottom
Inside right
Inside left
Inside top right (default for 2-D plots)
Inside top left
Inside bottom right
Inside bottom left
Outside plot box near top
Outside bottom
Outside right
Outside left
Outside top right (default for 3-D plots)
Outside top left
Outside bottom right
Outside bottom left
Least conflict with data in plot
Least unused space outside plot
Using one of the...Outside values for 'Location' ensures that the legend does not overlap the plot, whereas overlaps can occur when you specify any of the other cardinal values. The location property applies to colorbars and legends, but not to axes.
 Note: You can set the legend location by passing the 4-element position vector to the legend function using the 'Location' option. To define the position of an existing legend, use the set function to assign the 4-element position vector to the 'Position' property. You cannot use the Location option with the set function.
Obsolete Location Values
The first column of the following table shows the now-obsolete specifiers for legend locations that were in use prior to Version 7, along with a description of the locations and their current equivalent syntaxes.
 Note: Support for these numeric specifiers will be removed in a future release. Use the supported string specifiers instead.
Obsolete SpecifierLocation in AxesCurrent Specifier
Outside axes on right side
Inside axes
Upper right corner of axes
Upper left corner of axes
Lower left corner of axes
Lower right corner of axes
legend(...,'Orientation','orientation') creates a legend with the legend items arranged in the specified orientation. orientation can be vertical (the default) or horizontal.
[legend_h,object_h,plot_h,text_strings] = legend(...) returns
 - legend_h — Handle of the legend axes
 - object_h — Handles of the line, patch, and text graphics objects used in the legend
 - plot_h — Handles of the lines and other objects used in the plot
 - text_strings — Cell array of the text strings used in the legend
Relationship to Axes
legend associates strings with the objects in the axes in the same order that they are listed in the axes Children property. By default, the legend annotates the current axes.
You can only display one legend per axes. legend positions the legend based on a variety of factors, such as what objects the legend obscures.
The properties that legends do not share with axes are
 - Location
 - Orientation
 - EdgeColor
 - TextColor
 - Interpreter
 - String
Using Keywords as Legend Labels
To use legend keywords like 'Location', 'Orientation', 'Off', 'Hide', or property names as legend labels, pass the string in a cell array to the legend function as,
l = legend({'Location'});
Add a legend to a graph showing a sine and cosine function. The default location is upper right, within the axes:
x = -pi:pi/20:pi;
hleg1 = legend('cos_x','sin_x');
The legend reflects that plot specified a solid, red line ('-ro') for the cosine function and a dash-dot, blue line ('-.b') for the sine function.
Update the legend. Use the returned legend handle, hleg1, to move the legend to the upper left. Also turn off the TeX interpreter to render underscores in legend text literally rather than as subscripts


Help Center
for a free consultation0330 _PHONE_ emergency response0330 _PHONE_
What are the costs to Relocate A Birds Nest
What are the costs to Relocate A Birds Nest
What are the costs to Relocate A Birds Nest
What are the costs to Relocate A Birds Nest
While birders might take pleasure in playing host to nesting birds and enjoying parents raise their young, birds do not always build their nests in safe or ideal areas. Before removing bird nests, however, it is essential to understand local laws including wildlife removal along with whether eliminating the nest is safe and comfy for the birds.
A lot of birds are protected species and tampering with or removing a nest or eggs might lead to large fines or other penalties. In the United States, for instance, it is illegal to get rid of or damage any active nest from a native bird species, defined as a nest with eggs or brooding adults in it.
Nests of invasive birds, such as house sparrows or European starlings, however, are not safeguarded at any time. Laws in other nations might differ, and before interfering with any nest, it is best to properly determine the bird types and discover how local laws might use to your actions. Illustration: The Spruce, 2018 In certain situations it might be needed and preferable to eliminate bird nests, both for security and benefit.
Where to find companies that remove Birds Nesting In My Roof
The nest is presently unused and has actually become shabby and hazardous for future usage. The nest remains in a birdhouse that needs to be cleaned up out for future locals or winter use. The nest remains in a dangerous place and brooding birds could end up being stressed out or hurt. In many cases, it is only after the nesting season has ended and the birds have actually moved on that nests can and must be eliminated.
Unsafe locations generally consist of: Near a door or hectic walkwayInside a rain gutter or drain pipeInside connected clothes dryer ventsOn equipment, such as a grill or yard mowerInside an active chimney. Balanced on a cars and truck bumper or tireIn any extremely active location, such as on play area devices, in a building and construction zone, or inside a storage facility If birds have developed their nests in these kinds of places, it is best to get rid of the nest and prevent the birds from restoring in the exact same spot.
It might likewise be possible to move the nest to a more secure place nearby. The moms and dad birds will go back to the nearby nest to continue raising their young, and after the news have left, actions can be taken to keep the grownups from recycling the hazardous place. Some nests must never ever be gotten rid of unless the appropriate wildlife authorities are consulted or there are absolutely no other choices to keep the nesting birds safe.
Local techniques to Bird Control Solutions
When it is safe and proper to get rid of a bird's nest, care should be taken so the nest is properly eliminated. Confirm the nest for any staying eggs or chicks, and wait to be sure the healthy birds have actually all been out of the nest for numerous days before starting any elimination.
Which experts - Relocate A Birds Nest by relied on companiesWhich experts – Relocate A Birds Nest by relied on companies
Use gloves when handling the nest to secure against contamination from mites, bacteria, or other parasites that may have infected the nest. Tiny bugs may be almost difficult to see in the nesting particles, or the nest might be contaminated with various types of germs or mold that might affect humans.
Nesting product will naturally decay, or might even be reused by other nesting birds. Tidy the location where the nest lay, using a solution of one part chlorine bleach to nine parts water. Note: It is not required to clean a tree or bush where a nest lay, however do clean any synthetic surface areas close by, such as a rain gutter, roof, hanging bracket, or nesting shelf.
Where to find companies that Bird Control Solutions
If you do not desire birds reusing the exact same Bristol area after you have eliminated a nest, it will be necessary to take actions to prevent birds from restoring. Altering the shape of the surface where the birds constructed their nest by adding a slanted board or spikes to make it less inviting will assist discourage nesting.
Local techniques to Remove A Birds Nest In The UkCommon tricks to Can You Remove A Brids Nest Near Me
Alertness at the beginning of the nesting season will be vital, and removing nests before they are completed will assist urge risky birds to move to a various area to raise their households. Watching nesting birds is constantly a reward, however there are times when a nest is not placed appropriately either for birds or birders.
All wild bird species, their eggs and nests are protected by law. You must constantly try to prevent harming birds or to utilize procedures which do not kill or hurt them prior to thinking about taking harmful action. In the majority of cases you need to be able to prevent hurting wild birds by: timing your work to avoid the reproducing season utilizing a series of techniques that discourage but do not damage them In exceptional cases the law permits specific exemptions to permit legal activities (such as a development with planning authorization) and where avoiding damage isn't possible.
Most used tricks to Bird Nest Removal Service Near Me
If wild birds are triggering you issues, there are ways to handle them lawfully. It's often legal to hunt some species of bird, such as video game birds. You're breaking the law if you: deliberately kill, injure or take wild birds deliberately take, damage or damage a wild bird's nest while it's being used or constructed deliberately take or ruin a wild bird's egg have, manage or transfer live or dead wild birds, or parts of them, or their eggs sell wild birds or put them on display for sale use restricted approaches to eliminate or take wild birds Some birds, referred to as 'schedule 1 birds', eg barn owls, have additional legal protection.
Most used tricks to Remove A Birds Nest In The Uk Near MeWhat are the costs to Bird Nest Removal Service
These activities can impact wild birds, especially throughout reproducing season: trimming or cutting trees, bushes, hedges and rough plant life remodeling, converting or demolishing a building producing disruption, eg noise, lighting and vibration acting to avoid problems, eg shooting birds or removing nests There are no licensing functions to allow advancement or construction however there are methods you can continue advancement or construction when birds are present.
You should make sure that you can comply totally with the terms of the exemption so that you do not break the law. You can make an application for a licence from Natural England in certain scenarios and for specific issues. Licences are offered for troubling or harming birds for a restricted number of reasons that consist of: protect public health and safety maintain air security do work for science, education or research prevent damage to crops or animal feed save plants and animals (consisting of other wild birds) avoid damage to fisheries take part in photography, falconry, keeping or reproducing birds in Bristol. Find out what's included for building and construction that affects protected types.
 - Brian Smith
 Posted January 8, 2019 8:58 am 0Likes
 Your support team is amazing! I loved how fast my issue was resolved, thank you
Add Comment
17 Arlington Rd, Birmingham, West Midlands B14 4QB
0330 _PHONE_
to top


text:
- Books, Literature, and Writing»
- Books & Novels
Easy Sport Books for Struggling Readers: Athlete Facts and Sports Fiction
Reluctant and struggling readers can not be motivated to read because the topics are not interesting to them. Active boys and girls are more likely to read about their hobbies and interests even if reading is not their strongest subject. To meet the reading needs of this audience of readers, children's authors and their publishers are bringing these stories to library shelves and classrooms. Just like there are books on every subject for all types of readers, this list focuses on the easy sports books that are not intimidating to struggling readers.
Sports Books for the Young
Young struggling readers will often read about their favorite characters. If characters such as Froggy, Brother Bear, or Arthur like soccer or baseball just like the young reader, they are likely to branch out to other characters with similar interests if books are at the same level. It may take the parent to incorporate these new characters and series as part of the read-aloud to introduce their child to new books. Reading the books with the child makes it less threatening and they may find it is easier than they thought.
For those who live and breathe their sport, they already know the vocabulary and basics, so they may want to read books more devoted to the sport than to the character. The Dewey Decimal system for non-fiction books will match a reader to their sport and open up a whole section of books that interest them. Soccer players will find My Soccer Book by Gail Gibbons and Score!: You Can Play Soccer by Nick Fauchald in 796.334 while baseball players may find a new home in the library a shelf down at 796.357.
High Interest Sport Biographies
Toddlers are aware of environmental print, that is signs and words around them that they easily recognize. Examples including restaurant logos like McDonald's are part of the early reader's repertoire. The same is true for the child who follows their family's favorite sporting team. Jerseys are the environmental print for the sports enthusiast. Not only do they learn to recognize animal names like Sharks, Bears, and Orioles, but also player names like Jones, Martinez, and Sutter.
Once they learn about their favorite teams and players, they will seek out more information about them. Current players make it into the newspapers and sports periodicals, so reading the sports section with your child will show how readers find information on a regular basis that has nothing to do with school. In some articles, readers learn more about how a professional player got to their current career, while other articles report on their special interests and community involvement.
Biography books do the same. These children's books are written for a younger audience and their readability. Rising sport stars have their books published quickly to meet the demand for their stories. They may be identified as high-interest, but a review of the content will determine its readability. If the reader is truly motivated to read about their favorite player, they will do their best to read and comprehend, using their background knowledge on the topics or asking questions about words or concepts. Children's biographies often include glossaries that are not provided in adult biographies.
Understanding the Codes
- AR = Accelerated Reader
- SC = Scholastic Counts
- RL = Reading Level (based on grade equivalent)
- Lexile = The Lexile text measure system is a one of the ways that children's books determine readability and difficulty for the individual. Readers can match their Lexile reader measure with the text measure.
- IL = Interest Level (based on age equivalent)
When it comes to the different ages and levels of readers, children may not read at their grade level. A first grader may be a strong reader and can read chapter books, but it doesn't mean that they have the maturity to read books intended for middle schoolers. At the same time, a middle school student wants to read about children who can relate to their issues and interests, but a struggling reader in eighth grade may be discouraged that they can only read books written about third graders. The search for the right book should consider both the reading level and the interest level. For example, a seventh grader with an independent reader level of 4.0, or fourth grade, will look for a book with a RL around 4.0 and an IL between 4-8 (fourth to eighth grade). If they are looking at books that are measured with the Lexile system, they will consider books around 590-600. If they like hockey, then Backup Goalie by Bob Temple of the Impact Jake Maddox series is a good match.
An interest in sports can connect a child to reading. Young readers are motivated by characters and familiar text, but as they age, characters and plots become more complex. They grow out of their childhood characters and need guidance to find their next favorite story. When parents do not know which books are available, they or their child can get book advice from the librarians (school or public) or teachers and reading specialists.
Some authors are known for writing sports fiction. Matt Christopher is known for writing sports fiction for young readers but also wrote books for middle school interests. His website allows visitors to search for books by sport as well as series. Some stories are realistic fiction while others are fantasy. Mike Lupica is another author who has found success writing about baseball. Robert Skead rediscovered his love for writing and found his niche with sports fiction. Dan Gutman combines the fantasy of time travel with baseball players in history in his Baseball Card Adventure series.
Struggling readers will be motivated to read if they are interested in the topic or author. They will stay motivated if they are able to read the text or want to use their skills to enjoy a book that truly interests them. Audiobooks are another way to read when the reader follows along with the CD as well as the book. It may take much trial and error finding the right book, author, subject, or reading level. In the end, however, it means that the struggling reader will find pleasure in books at their ability and interest level.
Search for Sports Books for Your Struggling Reader
Search engines make it possible to pinpoint books of interests in the areas of sports. The more specific the keyword, the more likely that the book will match the reader's interest. Keywords can include the name of a sport or organization (snowboarding, NBA,) or a group or event (World Cup, Olympics, extreme sports).
A parent or student can find the books they want by using a variety of resources. The local library is likely to have an online book catalog for their collection as well as other libraries in their inter-library loan system. When the reader has read their fill of the available books, they can request books from other libraries as well. A full display of book information may include reading level, Lexile text number, interest level, and availability.
Other search engines specifically for children's books:
- Scholastic Book Wizard or Age-by-Age Book Find
- Book Adventure.com: This site is a free reading motivator that allows registered users to take quiz questions on the books of their choice. The "Quiz-o-Matic" lets readers find books according to their interests or grade level and take quizzes on them for prizes.
- AR Book Find: This resource by Renaissance Learning was made to help students find books and quizzes for Accelerated Reader in schools. Parents and students can search according to title, author, interest, topics, reading level, and/or interest level. Even if your child's school does not participate in AR, the website is free and informative.
Reading Outside the Sports Box
When a reluctant or struggling reader finds a reading series they like that has one or more books on the subjects, they are more likely to look for other books outside of that subject or genre. My son read Slam Dunk Shoes because it was a book about basketball that was at a comfortable reading level but at his middle school interest level. On the back cover it listed other books in the Jake Maddox sports series. Football was his next sport of interest, which led to On the Line. The public library had 23 books in their system which kept him occupied for days. Once he got his fill of sports, we found other books by the same publishing company that featured historical fiction. Naturally he moved on to Civil War battles and the adventures of the Pony Express riders.
The hunt for sports books that interest the reluctant or struggling reader takes effort and resources, but the books are being written and published to meet the demand. Whether they read about the same sport or books by the same sports author, they are reading for enjoyment and learning the benefits of the written word.


text:
discover (part of speech: verb)
locate (part of speech: verb)
- The committee hesitated, and then one by one came after us, more anxious, I think, to complete the fiasco than to unearth facts. - "Caves of Terror", Talbot Mundy.
- I don't want you and Letitia to think that I was just making catspaws of you both, and forcing you without knowing, to help me unearth him in his lair. - "The Princess Virginia", C. N. Williamson A. M. Williamson.
- He also inspected the crypts of churches, to unearth traces of the priests' lubricity. - "The Aspirations of Jean Servien", Anatole France.


text:
Community Prevention Framework Evaluation Reports
– Dennis O. Romero, M.A, Former Director of CSAP (2007)
Fitting CTC into SPF
It is important to remember that the CTC system is simply a tool to aid in building a prevention infrastructure referred to as the SPF process. CTC and SPF are not programs nor are they administrative names for program implementation. They exist and work together in helping communities get organized, identify problem areas based on community data, make knowledgeable decisions pertaining to how these problems should be addressed, and evaluate any actions taken to counter the problem areas. Most people are either familiar with SPF or with CTC, or they have no prior knowledge of either. This website was designed to help everyone navigate through the elements of the SPF process, see how CTC fits into this process, and also gain a greater knowledge in building a strong prevention infrastructure. Each phase of the CTC system fits well into a coordinating phase of the SPF process, and it is clear that sustainability and cultural competency as key components to every part of building a prevention infrastructure. When navigating this website, the chart above can be used to find either CTC or SPF materials.


text:
What is RBAC?
Kubernetes Role-Based Access Control or the (RBAC) system describes how we define different permission levels of unique, validated users or groups in a cluster. It uses granular permission sets defined within a.yaml file to allow access to specific resources and operations.
Starting with Kubernetes 1.6, RBAC is enabled by default and users start with no permissions, and as such, permissions must be explicitly granted by an admin to a specific service or resource. These policies are crucial for effectively securing your cluster. They permit us to specify what types of actions are allowed, depending on the user's role and their function within the organization.
Prerequisites for using Role-Based Access Control
To take advantage of RBAC, you must allow a user the ability to create roles by running the following command:
root@test:~# kubectl create clusterrolebinding cluster-admin-binding \
--clusterrole cluster-admin --user
Afterwards, to start a cluster with RBAC enabled, we would use the flag:
The RBAC Model
Basically, the RBAC model is based on three components; Roles, ClusterRoles and Subjects. All k8s clusters create a default set of ClusterRoles, representing common divisions that users can be placed within.
The "edit" role lets users perform basic actions like deploying pods.
The "view" lets users review specific resources that are non-sensitive.
The "admin" role lets a user manage a namespace.
The "cluster-admin" allows access to administer a cluster.
A Role consists of rules that define a set of permissions for a resource type. Because there is no default deny rules, a Role can only be used to add access to resources within a single virtual cluster. An example would look something like this:
- apiGroups: [""] # "" indicates the core API group
resources: ["pods"] verbs: ["get", "watch", "list"]
In this case, the role defines that a user (dev1) can use the "get", "watch" or "list" commands for a set of pods in the "testdev" namespace.
A ClusterRole can be used to grant the same permissions as a Role but, because they are cluster-scoped, they can also be used to grant wider access to:
- cluster-scoped resources (like nodes)
- non-resource endpoints (like a folder named "/test")
- namespaced resources (like pods) in and across all namespaces. We would need to run
kubectl get pods --all-namespaces
It contains rules that define a set of permissions across resources like nodes or pods.
An example would look something like this:
# "namespace" omitted since ClusterRoles are not namespaced
- apiGroups: [""] resources: ["secrets"] verbs: ["get", "watch", "list"]
The default ClusterRole command looks like this:
root@test:~# kubectl create clusterrole [Options]
A command line example to create a ClusterRole named "pod", that allows a user to perform "get", "watch" and "list" on a pod would be:
root@test:~# kubectl create clusterrole pod --verb=get,list,watch --resource=pod
A RoleBinding is a set of configuration rules that designate a permission set. It binds a role to subjects (Subjects are simply users, a group of users or service accounts). Those permissions can be set for a single namespace (virtual cluster), with a RoleBinding or, cluster-wide with a ClusterRoleBinding.
Let's allow the group "devops1" the ability to modify the resources in the "testdev" namespace:
root@test:~# kubectl create rolebinding devops1 --clusterrole=edit --group=devops1 --namespace=dev rolebinding "devops1" created
Because we used a RoleBinding, these functions only apply within the RoleBinding's namespace. In this case, a user within the "devops1" group can view resources in the "testdev" namespace but not in a different namespace.
A ClusterRoleBinding defines which users have permissions to access which ClusterRoles. Because a "role" contains rules that represent a set of permissions, ClusterRoleBindings extend the defined permissions for:
- unique namespace in resources like nodes
- resources in all namespaces in a cluster
- undefined resource endpoints like "/foldernames"
The default ClusterRoles (admin, edit, view) can be created using the command:
root@test:~# kubectl create clusterrolebinding [options]
An example of creating a ClusterRoleBinding for user1, user2,and group1 using the cluster-admin ClusterRole
root@test:~# kubectl create clusterrolebinding cluster-admin --clusterrole=cluster-admin --user=user1 --user=user2 --group=group1
What is a configMap?
A configMap is a resource that easily attaches configuration data to a pod. The information that is stored in a ConfigMap is used to separate config data from other content to keep images/pods portable.
How Do I Create A ConfigMap?
To create a configmap, we simply use the command:
kubectl create configmap
Let's create a default.yaml file to create a ConfigMap:
kubectl create -f default.yaml /configmaps/location/basic.yaml
Basic RBAC Commands For Kubectl
kubectl get roles
kubectl get rolebindings
kubectl get clusterroles
kubectl get clusterrolebindings
kubectl get clusterrole system:node -o yaml
Namespaces are used to define, separate and identify a cluster of resources among a large number of users or spaces. You should only use namespaces when you have a very diverse set of clusters, locations or users. They are used in settings where companies have multiple users or teams that are spread across various projects, locations or departments. A Namespaces also provides a way to prevent naming conflicts across a wide array of clusters.
Inside a Namespace, an object can be identified by a shorter name like 'cluster1' or it can be as complex as 'US.MI.LAN.DC2.S1.R13.K5.ProdCluster1' but, there can only be a single 'cluster1' or a 'US.MI.LAN.DC2.S1.R13.K5.ProdCluster1' inside of that namespace. So, the names of resources within a namespace must be unique but, not spanning namespaces. You could have several namespaces which are different, and they can all contain a single 'cluster1' object.
You can get a list of namespaces in a cluster by using this command:
root@test:~# kubectl get namespaces
NAME STATUS AGE
cluster2dev Active 1d
cluster2prod Active 4d
cluster3dev Active 2w
cluster3prod Active 4d
Kubernetes always starts with three basic namespaces:
- default: This is the default namespace for objects that have no specifically identified namespace (eg. the big barrel o' fun).
- kube-system: This is the default namespace for objects generated by the Kubernetes system itself.
- kube-public: This namespace is created automatically and is world readable by everyone. This namespace is primarily reserved for cluster usage, in case that some resources should be visible and readable publicly throughout the whole cluster. The public aspect of this namespace is only a convention, not a requirement.
Finally, the essential concept of role-based access control (RBAC) is to ensure that users who require specific access to a resource can be assigned to those Roles, Clusterroles, and ClusterRolebindings as needed or desired. The granularity of these permission sets is structured and enabled to allow for increased security, ease of security policy modification, simplified security auditing, increased productivity (RBAC cuts down on onboarding time for new employees). Lastly, RBAC allows for increased cost reduction via removing unneeded applications and licensing costs for less used applications. All in all, RBAC is a needed addition to secure your Kubernetes infrastructure.