text:
Adventures By Disney More Adventures By Disney Stories
Mon, August 6, 2018
Culture, Cuisine, Temples and Tai Chi in Southeast Asia with Adventures by Disney
by Amanda Adler, Public Relations Manager, Adventures by Disney
Beauty and magic abounds in the Southeast Asian countries of Vietnam, Laos and Cambodia. You can explore the splendor of these locales with Adventures by Disney, including taking part in local customs like a sunrise alms ceremony with monks, savoring a regional cooking class, connecting with the majesty of temples such as Angkor Wat, studying Tai Chi with a master and so much more.
Check out just a few highlights of this amazing 12-day, 11-night Adventures by Disney vacation in this video.
Filled with history and tradition, Vietnam, Laos and Cambodia each offers its own natural beauty, artistic elegance and philosophies of living that permeate everything from their martial arts and religious practices to their delicious regional cuisine. Experience the world together with your loved ones on this amazing trip!
Share Culture, Cuisine, Temples and Tai Chi in Southeast Asia with Adventures by Disney
Destinations: Adventures By Disney
Topics: Vacation Planning
Wed, November 3, 2021
Adventures by Disney Announces New Opportunities for Families to Set Sail on Expedition Cruises to the Arctic in 2023
by Krissy Nocerino, Public Relations Manager, Disney Signature Experiences
Thu, June 17, 2021
A World Full of Magic, a Future Full of Possibilities
by Josh D'Amaro, Chairman, Disney Parks, Experiences and Products
Thu, June 3, 2021
Adventures by Disney Announces 2022 New England Vacation and Expansion of Private Adventures
by Melody Vagnini, Public Relations Manager, Disney Signature Experiences
Fri, November 16, 2018 Adventures By Disney
Unique Cultural Activities Abound on Adventures by Disney Vacations
Wed, November 7, 2018 Adventures By Disney
Get Acquainted with Fierce, Furry and Feathered Animal Friends with Adventures by Disney
Thu, November 1, 2018 Adventures By Disney
Staying in a Real-Life Castle on the Adventures by Disney Ireland Vacation


She lay crouched in the dark musty nook. A lone streak of light shone in through the small hole in the makeshift wooden door to the tiny storeroom where she hid. The light diffused air particles in the line of her view as she strained to see outside.
The living room windows opened out on the first level just above the storeroom and she could hear their low voices.
She stifled a rising cough in the throat afraid to attract attention. The voices now transformed to chilling war cries.
Shrapnel flew and came pelting on the tin roof of the storehouse followed by rapid footsteps. She shuddered. Fearing the worst, she flung open the door and dashed out.
A bile rose to her throat as she saw the damage caused and shook with vengeful rage.
Her favourite white bone china vase with indigo prints that once stood proudly near the window lay shattered in pieces all over the store roof and the ground below.
The two culprits jumped out from behind her displaying toothy grins and cried out in unison.
"Of course, I'm good at playing the bad cop!" she replied with a twinkle.
Written for the prompt "War and pieces" at the BarAThon.
Would you like to read the other posts in this series?
I'm glad! Thanks a lot, Shantala!
Ha ha.. that's a familiar scenario. I loved how you built it up. The mom here was quite nice. I wouldn't have had that twinkle if they'd have broken my favourite vase.
What a sudden turn! Interesting.
My vase?! Not my vase! I'd be shaking with rage then. Not fear. Ha ha. Good twist again. Totally got the world War 2 feel on this one.


text:
Q: check if attribute is existing I am binding a repeater to XmlDataSource, binding an image source with a node value like below
<img src="<%# XPath("a:tags/a:tag[contains(@namespace, 'second_image')]", nsmgrdc).ToString() %>"
alt="<%# XPath("a:title",nsmgrdc)%>" />

but sometimes my XML doesn't have this node so i receive an error

Object reference not set to an instance of an object.

is there a way i can check or do try, catch on the ItemTemplate level

A: It's because of calling ToString method on null object. Simply use XPath("a:tags/a:tag[contains(@namespace, 'second_image')]", nsmgrdc) without calling ToString.

redpajama_set_name: RedPajamaStackExchange


text:
[contact-form-7 id="1125" title="Contact form 1"]
About Matt Erkan
About RE/MAX Realtron
Assignment FAQ
Get MLS Email Alerts
Real Estate Buying FAQ
Condo VIP
1% Listing Commission
Home / Vaughan
Vaughan is a city in York Region north of Toronto with a population of 288,301 people. Vaughan is one of southern Ontario's fastest growing cities. According to Statistics Canada, the population grew 37.3% in a mere four-year period and also has a younger age profile than the Canadian average as 22.3% is under the age of 14, while those over 65 constitute 8.15%, one of the lowest in Ontario resulting in an average age of 34.1.
Vaughan is reputably known as having some of the highest concentrations of southern Europeans (notably Italians), Eastern Europeans (chiefly Russians and Poles) and Jewish people in Ontario, while those who are of British and/or Irish origin form a smaller proportion than in many other southern Ontario cities.
The City of Vaughan is ranked as one of the top fastest growing Canadian cities and best places to business and live, according to Canada's business and research publications:
No.10 – Vaughan – Infrastructure for Small Cities – fDi Magazine, American Cities of the Future 2011/2012
No.2 – Vaughan – Fastest population growth among cities over 100,000, Statistics Canada, 2011
No.10 – Vaughan – Top Ontario investment towns, Real Estate Investment Network, 2011
No.12 – Vaughan – Best city to do business in Canada, Canadian Business Magazine, 2011
No.10 (out of 180 cities and towns) – Vaughan – Household Income Rank, Moneysense – Canada's Best Places to Live, 2011
A-Grade, No.2 – Vaughan – Benchmarking the Attractiveness of 50 Canadian Cities, Conference Board of Canada, 2010
York University in North York, Ontario lies on the Toronto side of the Toronto-Vaughan border. It is a major comprehensive university, with more than 43,000 students enrolled through ten different faculties.
There are also a number of Elementary and High Schools in Vaughan which operate under the York Region District School Board and the York Catholic District School Board and there are also some private schools.
Vaughan is home to the Ontario Soccer Association. The OSA is the largest sports organization in Canada, with over 500,000 registered players. It is also home to the Canadian Soccer Hall of Fame and Museum.
Other major attractions:
Boyd Conservation Area, park located between Woodbridge and Kleinburg
Canada's Wonderland, Canada's largest amusement park, located in Maple
Kortright Centre for Conservation, located in Woodbridge
McMichael Canadian Art Collection, located in Kleinburg
Vaughan Mills, a large shopping mall
J.E.H. MacDonald House
Copyright © 2020 erkan.ca

redpajama_set_name: RedPajamaCommonCrawl


It would be cool if you could make an autoplay function..
Like a news slider.. it change the player like every 5 sec.. So u dont have to refresh the site to show a new player..
Random rotation for the random player module is a good idea, feel free to create a feature request ticket.
Would be nice to see there a "man of the match/day" function, too.
For example, you can choose a specific event of a matchday and the module pics up the best player out of it.
Mavinas wrote: Would be nice to see there a "man of the match/day" function, too.


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We are here to set a new benchmark in IT Training standards. With the RED HAT specified level 3 infrastructure (16GB RAM, i5 processor configuration) and Highly qualified trainers (Only RHTP with 100% instructors as Red Hat Certified Architects, which is the highest certification level) , we are gearing up to become Global IT Training Hub @ Kochi.
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Anginette serves borrowers from all over the state of Texas, with a focus on purchasers and with a particular specialty in conventional, FHA, and VA loans. From savvy investors to first-time homebuyers, no matter the client, Anginette's business model operates on the golden rule. In addition, Anginette makes availability and personal attention major foundational facets of the client-centric service she provides—staying accessible, providing well-rounded feedback, and taking the time to prepare homebuyers for all the realities of the process.
Just as Anginette makes it a priority to keep her clients informed and educated throughout the lending process, she also places great importance in remaining an up-to-date expert on the ever-changing marketplace. She prides herself on being an active professional in her industry as a member of the National Association of Realtors (NAR), the Texas Association of Realtors (TAR), and the Women's Council of Realtors where she received the distinguished "Affiliate of the Year" award for outstanding service and dedication. Anginette is also a graduate of TAR's leadership program and is a member of the MetroTex Association of Realtors, as well. "I work actively to further my knowledge and build resources for myself and the clients I work with," Anginette says. "Knowledge is powerful." Through her continued education, Anginette ensures that her clients are given the best advisement and resources possible to make fully informed decisions in their lending process.


text:
package com.google.errorprone.bugpatterns;

import static com.google.common.collect.ImmutableMap.toImmutableMap;
import static com.google.common.collect.Iterables.getOnlyElement;
import static com.google.errorprone.BugPattern.SeverityLevel.WARNING;
import static com.google.errorprone.matchers.Description.NO_MATCH;
import static com.google.errorprone.matchers.method.MethodMatchers.staticMethod;
import static com.google.errorprone.util.ASTHelpers.constValue;
import static com.google.errorprone.util.ASTHelpers.getReceiver;
import static com.google.errorprone.util.ASTHelpers.getSymbol;
import static java.util.stream.Collectors.toList;

import com.google.common.base.Converter;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableTable;
import com.google.errorprone.BugPattern;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
import com.google.errorprone.fixes.SuggestedFix;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.matchers.Matcher;
import com.google.errorprone.util.ASTHelpers;
import com.sun.source.tree.BinaryTree;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.LiteralTree;
import com.sun.source.tree.MethodInvocationTree;
import com.sun.source.tree.Tree;
import com.sun.source.util.TreePath;
import com.sun.source.util.TreeScanner;
import com.sun.tools.javac.code.Symbol.MethodSymbol;
import java.time.Duration;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalUnit;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicBoolean;

/** A {@link BugChecker}; see the associated {@link BugPattern} annotation for details. */
@BugPattern(
    name = "CanonicalDuration",
    summary = "Duration can be expressed more clearly with different units",
    severity = WARNING)
public class CanonicalDuration extends BugChecker implements MethodInvocationTreeMatcher {

  enum Api {
    JAVA("java.time.Duration"),
    JODA("org.joda.time.Duration");

    private final String durationFullyQualifiedName;

    private Api(String durationFullyQualifiedName) {
      this.durationFullyQualifiedName = durationFullyQualifiedName;
    }

    String getDurationFullyQualifiedName() {
      return durationFullyQualifiedName;
    }
  }

  private static final Matcher<ExpressionTree> JAVA_TIME_MATCHER =
      staticMethod().onClass(Api.JAVA.getDurationFullyQualifiedName());

  private static final Matcher<ExpressionTree> JODA_MATCHER =
      staticMethod().onClass(Api.JODA.getDurationFullyQualifiedName());

  private static final ImmutableTable<Api, ChronoUnit, String> FACTORIES =
      ImmutableTable.<Api, ChronoUnit, String>builder()
          .put(Api.JAVA, ChronoUnit.DAYS, "ofDays")
          .put(Api.JAVA, ChronoUnit.HOURS, "ofHours")
          .put(Api.JAVA, ChronoUnit.MINUTES, "ofMinutes")
          .put(Api.JAVA, ChronoUnit.SECONDS, "ofSeconds")
          .put(Api.JAVA, ChronoUnit.MILLIS, "ofMillis")
          .put(Api.JAVA, ChronoUnit.NANOS, "ofNanos")
          .put(Api.JODA, ChronoUnit.DAYS, "standardDays")
          .put(Api.JODA, ChronoUnit.HOURS, "standardHours")
          .put(Api.JODA, ChronoUnit.MINUTES, "standardMinutes")
          .put(Api.JODA, ChronoUnit.SECONDS, "standardSeconds")
          .build();

  private static final ImmutableMap<String, TemporalUnit> METHOD_NAME_TO_UNIT =
      FACTORIES.rowMap().values().stream()
          .flatMap(x -> x.entrySet().stream())
          .collect(toImmutableMap(x -> x.getValue(), x -> x.getKey()));

  private static final ImmutableMap<ChronoUnit, Converter<Duration, Long>> CONVERTERS =
      ImmutableMap.<ChronoUnit, Converter<Duration, Long>>builder()
          .put(ChronoUnit.DAYS, Converter.from(Duration::toDays, Duration::ofDays))
          .put(ChronoUnit.HOURS, Converter.from(Duration::toHours, Duration::ofHours))
          .put(ChronoUnit.MINUTES, Converter.from(Duration::toMinutes, Duration::ofMinutes))
          .put(ChronoUnit.SECONDS, Converter.from(Duration::getSeconds, Duration::ofSeconds))
          .put(ChronoUnit.MILLIS, Converter.from(Duration::toMillis, Duration::ofMillis))
          .put(ChronoUnit.NANOS, Converter.from(Duration::toNanos, Duration::ofNanos))
          .build();

  // Represent a single day/hour/minute as hours/minutes/seconds is sometimes used to allow a block
  // of durations to have consistent units.
  private static final ImmutableMap<TemporalUnit, Long> BANLIST =
      ImmutableMap.of(
          ChronoUnit.HOURS, 24L,
          ChronoUnit.MINUTES, 60L,
          ChronoUnit.SECONDS, 60L);

  @Override
  public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
    Api api;
    if (JAVA_TIME_MATCHER.matches(tree, state)) {
      api = Api.JAVA;
    } else if (JODA_MATCHER.matches(tree, state)) {
      api = Api.JODA;
    } else {
      return NO_MATCH;
    }
    if (tree.getArguments().size() != 1) {
      // TODO(cushon): ofSeconds w/ nano adjustment?
      return NO_MATCH;
    }

    List<MethodInvocationTree> allInvocationsInParentExpression =
        getAllInvocationsInParentExpression(state);
    if (allInvocationsInParentExpression.isEmpty()) {
      return NO_MATCH;
    }

    List<Number> constValues =
        allInvocationsInParentExpression.stream()
            .map(t -> getOnlyElement(t.getArguments()))
            .map(arg -> entirelyLiterals(arg) ? arg : null)
            .map(arg -> constValue(arg, Number.class))
            .collect(toList());

    if (constValues.stream().anyMatch(Objects::isNull)) {
      return NO_MATCH;
    }

    if (constValues.stream().mapToLong(Number::longValue).allMatch(v -> v == 0L)) {
      return handleAllZeros(state, api, allInvocationsInParentExpression);
    }

    MethodSymbol sym = getSymbol(tree);
    if (!METHOD_NAME_TO_UNIT.containsKey(sym.getSimpleName().toString())) {
      return NO_MATCH;
    }
    TemporalUnit unit = METHOD_NAME_TO_UNIT.get(sym.getSimpleName().toString());
    Long banListValue = BANLIST.get(unit);
    if (banListValue != null
        && constValues.stream()
            .anyMatch(value -> Objects.equals(banListValue, value.longValue()))) {
      return NO_MATCH;
    }

    List<Duration> durations =
        constValues.stream().map(value -> Duration.of(value.longValue(), unit)).collect(toList());
    // Iterate over all possible units from largest to smallest (days to nanos) until we find the
    // largest unit that can be used to exactly express the duration.
    for (Map.Entry<ChronoUnit, Converter<Duration, Long>> entry : CONVERTERS.entrySet()) {
      ChronoUnit nextUnit = entry.getKey();
      if (unit.equals(nextUnit)) {
        // We reached the original unit, no simplification is possible.
        break;
      }
      Converter<Duration, Long> converter = entry.getValue();

      List<Duration> roundTripped =
          durations.stream()
              .map(converter::convert)
              .map(converter.reverse()::convert)
              .collect(toList());

      if (roundTripped.equals(durations)) {
        // We reached a larger than original unit that precisely expresses the duration, rewrite to
        // use it instead.
        for (int i = 0; i < allInvocationsInParentExpression.size(); i++) {
          MethodInvocationTree m = allInvocationsInParentExpression.get(i);
          long nextValue = converter.convert(durations.get(i));
          String name = FACTORIES.get(api, nextUnit);
          String replacement =
              String.format("%s(%d%s)", name, nextValue, nextValue == ((int) nextValue) ? "" : "L");
          ExpressionTree receiver = getReceiver(m);
          if (receiver == null) { // static import of the method
            SuggestedFix fix =
                SuggestedFix.builder()
                    .addStaticImport(api.getDurationFullyQualifiedName() + "." + name)
                    .replace(m, replacement)
                    .build();
            state.reportMatch(describeMatch(m, fix));
          } else {
            state.reportMatch(
                describeMatch(
                    m,
                    SuggestedFix.replace(
                        state.getEndPosition(receiver),
                        state.getEndPosition(m),
                        "." + replacement)));
          }
        }
        return Description.NO_MATCH;
      }
    }
    return NO_MATCH;
  }

  private static boolean entirelyLiterals(ExpressionTree arg) {
    AtomicBoolean anyNonLiterals = new AtomicBoolean();
    new TreeScanner<Void, Void>() {
      @Override
      public Void scan(Tree tree, Void unused) {
        if (!(tree instanceof LiteralTree) && !(tree instanceof BinaryTree)) {
          anyNonLiterals.set(true);
        }
        return super.scan(tree, null);
      }
    }.scan(arg, null);
    return !anyNonLiterals.get();
  }

  private Description handleAllZeros(
      VisitorState state, Api api, List<MethodInvocationTree> allInvocationsInParentExpression) {
    switch (api) {
      case JODA:
        for (MethodInvocationTree tree : allInvocationsInParentExpression) {
          ExpressionTree receiver = getReceiver(tree);
          SuggestedFix fix;
          if (receiver == null) { // static import of the method
            fix =
                SuggestedFix.builder()
                    .addImport(api.getDurationFullyQualifiedName())
                    .replace(tree, "Duration.ZERO")
                    .build();
          } else {
            fix =
                SuggestedFix.replace(
                    state.getEndPosition(getReceiver(tree)), state.getEndPosition(tree), ".ZERO");
          }
          state.reportMatch(
              buildDescription(tree)
                  .setMessage(
                      "Duration can be expressed more clearly without units, as Duration.ZERO")
                  .addFix(fix)
                  .build());
        }
        return NO_MATCH;
      case JAVA:
        // don't rewrite e.g. `ofMillis(0)` to `ofDays(0)`
        return NO_MATCH;
    }
    throw new AssertionError(api);
  }

  private static List<MethodInvocationTree> getAllInvocationsInParentExpression(
      VisitorState state) {
    // Walk up the tree path until the parent tree is no longer an expression.
    TreePath expressionPath = state.getPath();
    while (true) {
      TreePath parentPath = expressionPath.getParentPath();
      if (parentPath == null) {
        break;
      }
      if (!(expressionPath.getParentPath().getLeaf() instanceof ExpressionTree)) {
        break;
      }
      expressionPath = parentPath;
    }

    // This check gets run on all invocations of the duration methods, but we propose fixes for
    // all things in the same expression. As such, we detect if we are the first invocation of the
    // method, and if not, we don't check any further, because all trees will be checked when the
    // first invocation is checked.
    AtomicBoolean notFirst = new AtomicBoolean();

    // Scan the tree for invocations of the same method.
    MethodInvocationTree tree = (MethodInvocationTree) state.getPath().getLeaf();
    MethodSymbol methodSymbol = getSymbol(tree);
    List<MethodInvocationTree> sameMethodInvocations = new ArrayList<>();
    new TreeScanner<Void, Void>() {
      @Override
      public Void scan(Tree node, Void unused) {
        if (notFirst.get()) {
          return null;
        }
        return super.scan(node, unused);
      }

      @Override
      public Void visitMethodInvocation(MethodInvocationTree node, Void unused) {
        if (Objects.equals(methodSymbol, ASTHelpers.getSymbol(node))) {
          if (sameMethodInvocations.isEmpty()) {
            if (!Objects.equals(node, tree)) {
              notFirst.set(true);
              return null;
            }
          }

          sameMethodInvocations.add(node);
          return super.visitMethodInvocation(node, unused);
        }
        return super.visitMethodInvocation(node, unused);
      }
    }.scan(expressionPath.getLeaf(), null);

    if (notFirst.get()) {
      sameMethodInvocations.clear();
    }
    return sameMethodInvocations;
  }
}

redpajama_set_name: RedPajamaGithub


This is a continuation of our Photoshop course series.
In this 1 —day course, participants will learn how to: further customise Photoshop & use Presets, use Fill layers — solid, gradient and pattern. They will explore various ways to extract an object from an image using a mask. They'll experiment with vector paths by creating vector masks and converting type into editable shapes. They will also apply custom brushes, warping, and filters/Smart Filters along with other creative image effects as well as produce images for video.


IFBB Physique America Connecticut State Chairman, Albert Alfredo, proudly announces the first show in the state with the May 12th IFBBPA 2018 Connecticut Classic.
"It is an honor for me to promote the first event in the state for our new organization" states Alfredo. "I am also pleased and proud to be promoting and presenting innovations that have never been done in the state with regards to Bodybuilding and Fitness competitions.".
The first major impression that Chairman Alfredo has accomplished is the event venue. The competition will be held in the Bobby Valentine's Sports Academy in Stamford, CT. "Having Bobby Valentine, a former Baseball player, manager, ESPN analyst and sport icon, involved is a major coup for the event. Bobby's participation gives the show instant credibility" articulates Alfredo.
"IFBB Physique America is fortunate to have Al Alfredo in charge of Connecticut. He is exactly the hard working, educated leader that our organization wants to be a prime state executive" orates IFBB Physique America CEO/President Wayne S. DeMilia.


It will be needful to determine the questions of dignity and happiness resulting therefrom from the position of the luminaries and the familiarity to them of their attendant planets. For if both the luminaries are in masculine signs and either both of them, or even one of the two, angular, and particularly if the luminary of the sect is also attended by the five planets, matutine to the sun and vespertine to the moon, the children will be kings. And if the attendant planets are either themselves angular or bear an aspect to the superior angle, the children born will continue to be great, powerful, and worldrulers, and they will be even more fortunate if the attendant planets are in dexter aspect to the superior angles.


text:
<?php namespace Square1\Wordpressed;

use Illuminate\Database\Eloquent\Collection;

class MetaCollection extends Collection
{
    /**
     * Return value for the given key
     *
     * @param string $key
     *
     * @return string
     */
    public function __get($key)
    {
        foreach ($this->items as $item) {
            if ($item->meta_key == $key) {
                return $item->meta_value;
            }
        }
    }
}


I have the setting to only download PDF but the program is not finding them. I''ve been able to do this in the past. I have my username and password set and I have tried level 1 to level 999.
I didn''t find PDF links on the site. I assume a logon is necessary. Can you contact me using support@metaproducts.com and provide me with more details? I will be glad to assist you.


text:
About Journal of Vibration and Acoustics
search filter All ContentAll JournalsJournal of Vibration and Acoustics
Research Papers (111)
Technical Papers (33)
Technical Briefs (10)
Vibration and Sound (7)
Special Issue: Tribomechadynamics (4)
Design Technology (2)
Fluid-Elastic Vibration Phenomena (1)
Numerical Methods in Acoustics (1)
Reliability, Stress Analysis, and Failure Prevention (1)
Damping (42)
Excitation (40)
Engineering simulation (30)
Stiffness (26)
Rotors (25)
Prediction of Squeal Instabilities of a Finite Element Model Automotive Brake With Uncertain Structural and Environmental Parameters With a Hybrid Surrogate Model
Enora Denimal, Jean-Jacques Sinou, Samuel Nacivet
Journal: Journal of Vibration and Acoustics
Article Type: Research Papers
J. Vib. Acoust. April 2022, 144(2): 021006.
Paper No: VIB-21-1055
This study focuses on the prediction of the stability behavior of an industrial automotive brake system under structural and environmental uncertainties. Uncertainties are modeled with a random distribution or an interval and are propagated with a hybrid surrogate model associating polynomial chaos and kriging. The objective is to create a surrogate model of each eigenvalue computed with the complex eigenvalue analysis (CEA). As the modes can be tracked only when unstable, the effective size of the training sets can become extremely small. Despite this limitation, it is shown the hybrid meta-model is still able to predict the stability of the brake system. Moreover, the hybrid meta-model gives a direct access to the mean and variance of the eigenvalues with respect to the design parameters without any additional Monte Carlo simulations (MCS). By considering different probability density function for the friction coefficient, it is shown it has a high influence on the stability and the latter should be accurately estimated.
Topics: Automotive brakes, Brakes, Construction, Eigenvalues, Experimental design, Finite element model, Friction, Polynomials, Stability, Uncertainty
Bilinear Systems With Initial Gaps Involving Inelastic Collision: Forced Response Experiments and Simulations
Kohei Noguchi, Akira Saito, Meng-Hsuan Tien, Kiran D'Souza
Published Online: July 9, 2021
In this paper, the forced response of a two degrees-of-freedom (DOF) bilinear oscillator with initial gaps involving inelastic collision is discussed. In particular, a focus is placed upon the experimental verification of the generalized bilinear amplitude approximation (BAA) method, which can be used for the accurate estimation of forced responses for bilinear systems with initial gaps. Both experimental and numerical investigations on the system have been carried out. An experimental setup that is capable of representing the dynamics of a 2DOF oscillator has been developed, and forced response tests have been conducted under swept-sine base excitation for different initial gap sizes. The steady-state response of the system under base excitation was computed by both traditional time integration and BAA. It is shown that the results of experiments and numerical predictions are in good agreement especially at resonance. However, slight differences in the responses obtained from both numerical methods are observed. It was found that the time duration where the DOFs are in contact with each other predicted by BAA is longer than that predicted by time integration. Spectral analyses have also been conducted on both experimental and numerical results. It was observed that in a frequency range where intermittent contact between the masses occurs, super-harmonic components of the excitation frequency are present in the spectra. Moreover, as the initial gap size increases, the frequency band where the super-harmonic components are observed decreases.
Topics: Approximation, Collisions (Physics), Displacement, Dynamics (Mechanics), Engineering simulation, Excitation, Resonance, Simulation, Spectroscopy, Parameter estimation
Response of Quasi-Integrable and Resonant Hamiltonian Systems to Fractional Gaussian Noise
Q. F. Lü, W. Q. Zhu, M. L. Deng
J. Vib. Acoust. February 2022, 144(1): 011010.
The major difficulty in studying the response of multi-degrees-of-freedom (MDOF) nonlinear dynamical systems driven by fractional Gaussian noise (fGn) is that the system response is not Markov process diffusion and thus the diffusion process theory cannot be applied. Although the stochastic averaging method (SAM) for quasi Hamiltonian systems driven by fGn has been developed, the response of the averaged systems still needs to be predicted by using Monte Carlo simulation. Later, noticing that fGn has rather flat power spectral density (PSD) in certain frequency band, the SAM for MDOF quasi-integrable and nonresonant Hamiltonian system driven by wideband random process has been applied to investigate the response of quasi-integrable and nonresonant Hamiltonian systems driven by fGn. The analytical solution for the response of an example was obtained and well agrees with Monte Carlo simulation. In the present paper, the SAM for quasi-integrable and resonant Hamiltonian systems is applied to investigate the response of quasi-integrable and resonant Hamiltonian system driven by fGn. Due to the resonance, the theoretical procedure and calculation will be more complicated than the nonresonant case. For an example, some analytical solutions for stationary probability density function (PDF) and stationary statistics are obtained. The Monte Carlo simulation results of original system confirmed the effectiveness of the analytical solutions under certain condition.
Topics: Noise (Sound), Resonance, Simulation
Modeling the Response of Structure–Tuned Liquid Damper Systems Under Large Amplitude Excitation Using Smoothed Particle Hydrodynamics
K. P. McNamara, M. J. Tait
The tuned liquid damper (TLD) is a system used to reduce the response of tall structures. Numerical modeling is a very important tool when designing TLDs. Many existing numerical models are capable of accurately capturing the structure–TLD system response at serviceability levels, covering the range where TLDs are primarily intended to perform. However, these models often have convergence issues when considering more extreme structural excitations. The goal of this study is to develop a structure–TLD model without convergence limitations at large amplitude excitations. A structure–TLD numerical model where the TLD is represented by a two-dimensional incompressible smoothed particle hydrodynamics (ISPH) scheme is presented. The TLD contains damping screens which are represented by a force term based on the Morison equation. The performance of the model is assessed by comparing to experimental data for a structure–TLD system undergoing large amplitude excitations consisting of 4-h random signals and shorter transient signals. The model shows very good agreement with the experimental data for the structural response. The free surface response of the TLD is captured accurately by the model for the lower excitation forces considered, however as the excitation force is increased there are some discrepancies. The large amplitude excitations also result in smoothed particle hydrodynamics (SPH) fluid particles penetrating the boundaries, resulting in degradation of the model performance over the 4-h simulations. Overall, the model is shown to capture the response of a structure–TLD system undergoing large amplitude excitations well.
Topics: Dampers, Damping, Excitation, Hydrodynamics, Particulate matter, Simulation, Fluids, Transients (Dynamics), Waves
Active Detection of Small Imperfections in Structures With Cyclic Symmetry
Eyal Baruch, Yoav Vered, Harel Plat, Izhak Bucher
J. Vib. Acoust. October 2021, 143(5): 051009.
Structures possessing cyclic symmetry such as turbine bladed disks, ultrasonic motors, and toothed gear wheels can experience elevated vibration levels when small deviations from circumferential periodicity exist. Detection of these perturbations via classical system identification approaches is time-consuming, indirect, and exhibits low sensitivity to defects, and is affected by measurement noise. The present work utilizes low-level forces that automatically lock onto a weighted rotating projection of the system modes at resonance frequency to enhance the detectability of small structural imperfections. The spatial localization of defects is exploited to identify multiple, localized, isolated defects' locations. The defects' severities are estimated based on the deviation from the circular structure's analytical mode shapes. The fast and enhanced precision of defect identification is obtained by employing the modal-filtered autoresonance technique. To validate the presented method, an experimental system consisting of a ring of coupled Helmholtz acoustic resonators was developed. Experimental results show good agreement with numerical simulations, verifying the method's capabilities to identify the location and severity of multiple defects. Thus, the implementation of the suggested method provides fast and precise structural health monitoring of cyclic-symmetric systems.
Topics: Excitation, Mode shapes, Resonance, Disks, Eigenvalues, Simulation
Global System Reduction Order Modeling for Localized Feature Inclusion
D. Dane Quinn, Adam R. Brink
J. Vib. Acoust. June 2021, 143(4): 041006.
The development of reduced-order models remains an active research area, despite advances in computational resources. The present work develops a novel order-reduction approach that is designed to incorporate isolated regions that contain, for example, nonlinearitites or accumulating damage. The approach is designed to use global modes of the overall system response, which are then naturally coupled to the response in the isolated region of interest. Two examples are provided to demonstrate both the accuracy and the computational efficiency of the proposed approach. The performance of this approach is compared to the exact response corresponding to a finite element simulation for the chosen problems. In addition, the accuracy and computational efficiency are shown relative to a standard Galerkin reduction based on the linear normal modes. It is found that the proposed reduction offer computational efficiency comparable to a Galerkin reduction, but more accurately represents the response of the system when both are compared to the finite element simulation.
Topics: Degrees of freedom, Equations of motion, Finite element analysis, Modal analysis, Modeling, Errors, Simulation, Dynamics (Mechanics), Damping, Damage
An Energy Closure Criterion for Model Reduction of a Kicked Euler–Bernoulli Beam
Suparno Bhattacharyya, Joseph P. Cusumano
Reduced order models (ROMs) can be simulated with lower computational cost while being more amenable to theoretical analysis. Here, we examine the performance of the proper orthogonal decomposition (POD), a data-driven model reduction technique. We show that the accuracy of ROMs obtained using POD depends on the type of data used and, more crucially, on the criterion used to select the number of proper orthogonal modes (POMs) used for the model. Simulations of a simply supported Euler–Bernoulli beam subjected to periodic impulsive loads are used to generate ROMs via POD, which are then simulated for comparison with the full system. We assess the accuracy of ROMs obtained using steady-state displacement, velocity, and strain fields, tuning the spatiotemporal localization of applied impulses to control the number of excited modes in, and hence the dimensionality of, the system's response. We show that conventional variance-based mode selection leads to inaccurate models for sufficiently impulsive loading and that this poor performance is explained by the energy imbalance on the reduced subspace. Specifically, the subspace of POMs capturing a fixed amount (say, 99.9%) of the total variance underestimates the energy input and dissipated in the ROM, yielding inaccurate reduced-order simulations. This problem becomes more acute as the loading becomes more spatio-temporally localized (more impulsive). Thus, energy closure analysis provides an improved method for generating ROMs with energetics that properly reflect that of the full system, resulting in simulations that accurately represent the system's true behavior.
Topics: Damping, Dimensions, Displacement, Dynamics (Mechanics), Energy budget (Physics), Errors, Steady state, Simulation, Principal component analysis
A Test Rig for the Experimental Investigation on the Nonlinear Dynamics in the Presence of Large Contact Interfaces and Numerical Models Validation
Christian Maria Firrone, Giuseppe Battiato
The simulation of the coupling between components modeled by finite elements (FEs) plays an important role for the prediction of the forced response of the assembly in terms of resonant frequencies, vibration amplitudes, and damping. This is particularly critical when the time-varying stress distribution must be limited for vibrating components with thin thickness coupled with large contacts. Typical examples can be found in aeronautical structures (plates, panels, and bladed disk components) assembled with bolted flanges, riveted lap joints, or joints without hole discontinuities like rail-hook joints, lace wire sealings, and strip dampers. In this paper, a new test rig is introduced for the experimental validation of a reduced-order model (ROM) based on the Gram–Schmidt Interface (GSI) modes applied to a friction contact whose dimensions are not negligible with respect to the size of the substructures. In this case, classical approaches like Craig–Bampton technique might be not effective in reducing the size of the problem when many contact nodes subjected to nonlinear contact loads cannot be omitted. The technique is implemented in a solution scheme in the frequency domain using penalty contact elements and the harmonic balance method. The preload on the joint is produced by permanent magnets to enhance the friction contact without introducing uncertainties due to bolting. Measurements are compared with the ROM simulations and with standard time-domain integration of the full FE model. The advantage of using the GSI technique is shown in terms of time computation and accuracy of the simulation.
Topics: Computer simulation, Damping, Excitation, Finite element model, Friction, Manufacturing, Permanent magnets, Resonance, Simulation, Stiffness
Uncertainty Quantification of Mode Shape Variation Utilizing Multi-Level Multi-Response Gaussian Process
K. Zhou, J. Tang
Mode shape information plays the essential role in deciding the spatial pattern of vibratory response of a structure. The uncertainty quantification of mode shape, i.e., predicting mode shape variation when the structure is subjected to uncertainty, can provide guidance for robust design and control. Nevertheless, computational efficiency is a challenging issue. Direct Monte Carlo simulation is unlikely to be feasible especially for a complex structure with a large number of degrees-of-freedom. In this research, we develop a new probabilistic framework built upon the Gaussian process meta-modeling architecture to analyze mode shape variation. To expedite the generation of input data set for meta-model establishment, a multi-level strategy is adopted which can blend a large amount of low-fidelity data acquired from order-reduced analysis with a small amount of high-fidelity data produced by high-dimensional full finite element analysis. To take advantage of the intrinsic relation of spatial distribution of mode shape, a multi-response strategy is incorporated to predict mode shape variation at different locations simultaneously. These yield a multi-level, multi-response Gaussian process that can efficiently and accurately quantify the effect of structural uncertainty to mode shape variation. Comprehensive case studies are carried out for demonstration and validation.
Topics: Mode shapes, Shapes, Uncertainty, Uncertainty quantification, Finite element analysis, Simulation, Modeling, Errors
A Study of Whole Joint Model Calibration Using Quasi-Static Modal Analysis
David A. Najera-Flores, Robert J. Kuether
Small length and time scales resulting from high-fidelity frictional contact elements make long duration, low frequency simulations intractable. Alternative reduced order modeling approaches for structural dynamics models have been developed over the last several decades to approximate joint physics based on empirical or mathematical models within a whole joint model representation. The challenge with nonlinear constitutive elements based on empirical models is that the parameters must be calibrated to either experimental or simulation data. This research proposes a model calibration technique that identifies the joint parameters of a four-parameter Iwan element based on the nonlinear natural frequencies and damping ratios computed with quasi-static modal analysis (QSMA). The QSMA algorithm is applied to the full-order finite element model (FEM) to obtain reference data, and a genetic algorithm optimizes the joint parameters within a reduced order model (ROM) by minimizing the difference between the nonlinear modal characteristics for the modes of interest. The calibration method is demonstrated on a C-Beam bolted assembly and the resulting reduced order model is validated by comparing simulations of broadband, forced transient response. The resulting calibrated model captures the nonlinear, multimodal response at a significantly reduced computational cost and can be utilized for producing efficient models that do not have supporting experimental data for calibration.
Topics: Calibration, Damping, Finite element model, Manufacturing, Modal analysis, Simulation, Transients (Dynamics), Displacement, Stress, Physics
Higher-Order Stabilized Perturbation for Recursive Eigen-Decomposition Estimation
Paul Mucchielli, Basuraj Bhowmik, Budhaditya Hazra, Vikram Pakrashi
J. Vib. Acoust. December 2020, 142(6): 061010.
Eigen-decomposition remains one of the most invaluable tools for signal processing algorithms. Although traditional algorithms based on QR decomposition, Jacobi rotations and block Lanczos tridiagonalization have been proposed to decompose a matrix into its eigenspace, associated computational expense typically hinders their implementation in a real-time framework. In this paper, we study recursive eigen perturbation (EP) of the symmetric eigenvalue problem of higher order (greater than one). Through a higher order perturbation approach, we improve the recently established first-order eigen perturbation (FOP) technique by creating a stabilization process for adapting to ill-conditioned matrices with close eigenvalues. Six algorithms were investigated in this regard: first-order, second-order, third-order, and their stabilized versions. The developed methods were validated and assessed on multiple structural health monitoring (SHM) problems. These were first tested on a five degrees-of-freedom (DOF) linear building model for accurate estimation of mode shapes in an automated framework. The separation of closely spaced modes was then demonstrated on a 3DOF + tuned mass damper (TMD) problem. Practical utility of the methods was probed on the Phase-I ASCE-SHM benchmark problem. The results obtained for real-time mode identification establishes the robustness of the proposed methods for a range of engineering applications.
Topics: Algorithms, Eigenvalues, Structural health monitoring, Perturbation theory, Degrees of freedom, Errors, Separation (Technology), Vibration, Simulation, Robustness
Transient Vibro-Thermography and Nonlinear Resonant Modes
G. Kolappan Geetha, D. Roy Mahapatra, Chi-Won In, D. A. Raulerson
Transient vibro-thermography for nondestructive evaluation and super-resolution imaging of material defects invariably employs nonlinear contact dynamics involving the ultrasonic actuator (horn) and the surface of the target structure. It produces nonlinear resonant modes of vibration in the target structural component. Vibration-induced heat generation is one phenomenon involved here. However, the contribution of nonlinear vibration on the thermal signature is poorly understood. In this study, we consider a metallic component with a thin-walled cavity as a representative sharp feature tuned to the main excitation frequency of the ultrasonic actuator. We have developed a mathematical model to simulate transient thermal signature of structural discontinuity/cavity/defect. The model incorporates a coupled thermo-viscoelastic heat generation process in the bulk material based on the Helmholtz free energy formulation. To capture the source of nonlinear resonant modes, we incorporate the stick-separation contact dynamics due to the ultrasonic horn and the target structural component. Commercial finite element simulation ( comsol multiphysics ) is used to quantitatively understand the nonlinear vibration response and the thermal transport behavior of the target structure with the cavity. The proposed model accounts for the effects of both the normal and the shear components of deformation contributing on heat generation and captures the nonlinear modal contribution on the heat flux map. The study shows how the geometric feature and material parameters produce an evolution of the nonlinear subsuper harmonics along with the primary harmonics tuned to the excitation frequency. Results obtained from numerical simulations are compared with the experimental results.
Topics: Cavities, Contact dynamics, Resonance, Simulation, Thermography, Transients (Dynamics), Heat, Heat flux, Excitation, Actuators
Fast Simulation of a Single Degree-of-Freedom System Consisting of An Iwan Element Using the Method of Averaging
Drithi Shetty, Matthew Allen
While Iwan elements have been used to effectively model the stiffness and energy dissipation in bolted joints, integrating the equations of motion of these elements is fairly expensive since implicit schemes, such as Newmark's methods, need to be used. This paper presents a method of simulating dynamic systems containing nonlinear Iwan elements that significantly reduce the computation cost by using closed-form expressions for stiffness and damping in the microslip regime and an averaging method for regions of time in which no external force is applied. The proposed algorithm is demonstrated on a single degree-of-freedom (SDOF) system to evaluate the range over which it retains accuracy and the improvement in performance it offers. Although the current implementation is limited to SDOF systems, it can be used to simulate the response of each mode in structures exhibiting weak nonlinearity that can be modeled using the modal Iwan approach. To verify this, the dynamic response of a finite element model of a beam assembly, integrated using the Newmark- β method, has been compared with its equivalent modal model integrated using the proposed algorithm. The results show that the algorithm accurately predicts the response in a fraction of the time taken by implicit integration schemes, so long as the modes remain uncoupled and weakly nonlinear.
Topics: Algorithms, Damping, Degrees of freedom, Finite element model, Simulation, Displacement, Stiffness, Impulse (Physics)
Efficient Virtual Tribomechadynamics by Means of Joint Modes for Detailed Investigation of Complex Local Stick and Slip Behavior Inside a Joint
Florian Pichler, Wolgang Witteveen, Lukas Koller
In the last years, the numerical and experimental research effort on joint nonlinearities and tribomechadynamics has increased. Thereby, local sticking and slipping effects as well as the influence of friction caused damping on the global dynamics are of interest. Conventional computational approaches like model order reduction techniques or the finite element method lead either to insufficient result quality or a high computational burden. For the efficient numerical consideration of jointed structures in combination with model order reduction, joint modes based on trial vector derivatives have been presented. These joint modes enable accurate computation of local nonlinear contact and friction forces together with efficient time integration even for high fidelity finite element models. This article describes the application of joint modes for efficient virtual tribomechadynamics. Therefore, a generic structure including a bolted joint is used. It is investigated if these joint modes reproduce local friction stress, and sticking/slipping areas comparable to the nonlinear finite element method within reasonable computational times. Moreover, global damping effects are studied at different preload levels and related to local sticking/slipping behavior. The numerical studies confirm that joint modes lead to accurate results with low computation effort and hence allow an efficient and detailed virtual investigation of complex joints. In addition, this publication shows that the consideration of tangential stiffness for the computation of joint modes remarkably increases the local result quality.
Topics: Computation, Damping, Finite element methods, Friction, Stiffness, Finite element model, Stress, Simulation, Dynamics (Mechanics), Multibody dynamics
Implementation and Comparison of Contact Models Within PIRAT for Nuclear Reactivity Control Systems
Matthew S. Bonney, Maxime Zabiégo
The reactivity control system is a vital safety system for a nuclear reactor. One of the most challenging aspects in the design of these systems is the operation during critical situations, in particular during earthquakes to safely shut-down the reactor. To study these situations, the toolbox python Implementation for Reliability Assessment Tools (PIRAT) is used to model two types of excitation: single frequency and realistic. The main focus of this work is the comparison of the implementation of the contact models used to describe the interaction between the subsystems. For the dynamic tool in PIRAT (dynamic Euler–Bernoulli for seismic event (DEBSE)), this is done with a two-stage linear spring or Lankarani and Nikravesh-based models. For the sine excitation, the results show four distinct response types with the maximum displacement varying between the models. Low-frequency excitation showed little variance while higher frequency excitation showed large variations. The realistic excitation, however, did not show these variations and showed nearly identical results for the contact models tested. This gives confidence in the simulations since the user selected contact model did not greatly affect the simulation results for a realistic excitation.
Topics: Control systems, Deformation, Excitation, Simulation, Displacement, Earthquakes, Design
Experimental and Simulation Study on the Response Characteristics of Engine Blades Under Thermo-Acoustic-Vibration Load
Shouqing Huang, Zemin Yao, Shouwen Liu, Jiang Yang, Dazhi Liu
J. Vib. Acoust. August 2020, 142(4): 041013.
Thermal, acoustic, and vibration loads are important to affect the strength and durability of many aerospace products, especially the compressor blades, solar wings, antennas, etc. In extreme cases, a strong acoustic load combined with vibration and thermal loads may cause blade fatigue damage or even failure. In the study, an experimental device is designed to simulate the thermo-acoustic-vibration comprehensive load. Based on the tested strain data, the response characteristics under the thermo-acoustic-vibration load are investigated experimentally. Besides, a finite element method (FEM) model considering the acoustic-vibration coupling and material parameters dependent on temperature is presented applying software ansys - workbench to calculate stress and strain frequency responses of the blades, and the results agree well with the experimental results. The work will help understand failure mechanism of aerospace products under a comprehensive load of thermo-acoustic-vibration.
Topics: Acoustics, Blades, Simulation, Stress, Vibration, Frequency response
A Resonant Metamaterial Line Array for Ultrasound Compressive Imaging
Ashkan Ghanbarzadeh-Dagheyan, Ali Molaei, Juan Heredia-Juesas, Jose Angel Martinez-Lorenzo
Acoustic metamaterials have been proposed for numerous applications including subwavelength imaging, impedance matching, and lensing. Yet, their application in compressive sensing and imaging has not been fully investigated. When metamaterials are used as resonators at certain frequencies, they can generate random radiation patterns in the transmitted waves from the transducers and received waves from a target. Compressive sensing favors such randomness inasmuch as it can increase incoherence by decreasing the amount of mutual information between any two different measurements. This study aims at assessing whether the use of resonating metamaterial unit cells in a single-layered non-optimized array between a number of ultrasound transceivers and targets can improve the sensing capacity, point-spread function of the sensing array (their beam focusing ability), and imaging performance in point-like target detection. The theoretical results are promising and can open the way for more efficient metamaterial designs with the aim of enhancing ultrasound imaging with lower number of transceivers compared to the regular systems.
Topics: Imaging, Metamaterials, Resonance, Simulation
Investigation on an Adaptive Method for Tonal Vibration Suppression
Xiling Xie, Mingke Ren, Zhiyi Zhang
Published Online: December 9, 2019
An adaptive method for suppressing mechanical vibration of multiple frequencies is investigated. The adaptive controller is reinforced with saturation alleviator to improve the convergence rate and performance of the adaptive algorithm. Tracking filters are used to extract harmonics of fluctuating frequencies and the anti-saturation unit works in series with the tracking filters to give constrained harmonic output. As a result, the controller is insensitive to abnormally large input that would otherwise induce saturation in actuators. A dynamic model is built for vibration suppression simulation and the numerical results indicate that the adaptive algorithm is effective in cases of multiple fluctuating frequencies and output saturation. Experiments were also conducted to test the performance of the adaptive method. Excitation with oscillating frequencies was applied, and the results have demonstrated that the harmonics can be suppressed effectively with the adaptive method.
Topics: Algorithms, Control equipment, Errors, Filters, Signals, Vibration, Vibration suppression, Simulation, Actuators, Control algorithms
Two- and Three-Dimensional Simulation of Sound Attenuation by Cylinder Arrays
Junjian Zhang, Z. Charlie Zheng, Guoyi Ke
A finite-difference time-domain (FDTD) simulation coupled with an immersed-boundary method is used to investigate sound attenuation through both two-dimensional (2D) and three-dimensional (3D) cylinder arrays. The focus is on sound attenuation behaviors near Bragg's bandgap frequencies for periodic structures. Both 2D and 3D simulations show that the finite cylinder arrays produce significant sound attenuation near the bandgap frequencies, with more attenuation effects in the 2D cylinder arrays because of the uniformity of sound source and neglected structure diffraction in the third dimension. When extended to 3D simulation, which can accommodate physically realistic conditions, sound attenuation near Bragg's frequencies is reduced in comparison with 2D results. The 3D simulation also reaches a better agreement when comparing with the measurement data from the literature. Results and discussions on arrangement of cylinder arrays to achieve better sound attenuation effects are also presented.
Topics: Cylinders, Energy gap, Simulation
In Situ Identification of Natural Frequency Branches in Gyroscopic Systems via Autoresonance and Phase-Locked Loop
Solomon Davis, Shachar Tresser, Netanel Ariel, Alex Ferdinskoif, Izhak Bucher
The methods described allow one to directly measure the individual branches of the Campbell diagram of a physical gyroscopic system at any rotation speed. Typically, such data are acquired by exciting the vibration modes through naturally occurring unbalance forces. During run-up, these forces expose some of the Campbell diagram, but mainly the forward whirling branches, leaving the backward whirling branches mostly hidden. Furthermore, good modal frequency data are only acquired at critical speeds. The methods proposed here allow one to excite either a forward or backward whirling mode at any rotation speed in a precisely controlled manner, greatly improving the quality of an acquired Campbell diagram. The technique employs an external excitation device that automatically produces oscillating forces at a chosen modal frequency. Control is based on the autoresonance feedback algorithm, which can excite a mechanical system at resonance effectively. It will also be shown that with two actuators and two sensors, one can choose which bending mode to excite at resonance in either the forward or backward whirling direction. As the rotation speed is then gradually increased, one can measure the speed dependence of the resonance frequency. Furthermore, when combining autoresonance with a phase-locked loop, one can acquire very clean measurements by removing most of the noise generated by the unbalance and other sources. The technique is demonstrated analytically, numerically, and experimentally.
Topics: Actuators, Excitation, Feedback, Filters, Limit cycles, Resonance, Rotation, Rotors, Sensors, Signals


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Since 2015 I have pretty much been out of the climbing game but for the past 100 days I have been training hard trying to get back into shape.
I set myself the goal of entering the #bbcs2018 as it was and is one of the highlights of my year whether it be spectating or competing.
100 days doesn't sound like much but it has taken pretty much everything I have mentally and physically. Fingers, elbows, back, shoulders I've hammered them all and whilst my prep was far from ideal, I made it.
The result was never important (unlike the Don @davebarrans I'm too old for that), it was a somewhat cliche journey of self re-discovery and in the end, out on the mats I actually had fun and it feels great to be back amongst the climbing community.
Thank you @bbcsport for creating the absolute highlight of this process possible and giving my niece the opportunity to see me 'doing climbing' for the first time.
Huge thanks also to everyone who's got me back enjoying climbing again but specifically these legends that somehow got me to the start line in pretty much in one piece @robinoleary @tricky_newheightsfitnesspt @dcpetts @davidmason85 @minaclimbing @cristianocosta11 you are all hero's.
Finally, a huge congratulations to all the finalists and winners @nathanphillipsclimbing & @hannahslaneythat was some inspirational schizzle.
Now to eat ALL the food, recover, regroup and set the next goal.


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Q: How to parse this kind of date time to sql datetime in java? I am trying to get tweet information from twitter in json format. And store them into a database, but the problem is twitter's date format. I get date as string
String time = ((JSONObject)array.get(i)).get("created_at").toString();

It prints
 Mon Aug 10 07:34:06 +0000 2015

for example. But of course i cannot store that in this format into database, how can i convert that  to Mysql date time in java ?
Any help is appreciated

A: Get the string:
String time = "Mon Aug 10 07:34:06 +0000 2015";

Create a DateFormat to parse this String
DateFormat df = new SimpleDateFormat("E MMM dd HH:mm:ss Z yyyy");

And parse the string (ParseException may be thrown)
DateTime date = df.parse(time);

UPDATE:
in order to store in MySql format DateTime, I use Java Timestamp.
// get the date
Date date = (Date)((JSONObject)array.get(i)).get("created_at");
// convert to timestamp
Timestamp ts = new Timestamp(date.getTime());

After you can send it to your database to persist.

A: You could use DateFormat.parse(String s)
Java Doc

A: thanks guys, i solved my problem like that ;

String time = ((JSONObject)array.get(i)).get("created_at").toString();
java.util.Date date = new Date(time);
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String format = formatter.format(date);
System.out.println(format);


I didn't grow up on Pokémon. As a matter of fact, I didn't start watching it until after college — I caught it on Cartoon Network as I was getting ready for work in the mornings… Don't know which season, or where in the story line I started… And I barely remember the episodes I caught. I just remember that the show wasn't bad, and I could see the appeal.
I've also never collected any of the cards. And I've never played any of the Pokémon video games, although I'm playing Pokémon GO… I've even got my wife playing it.
The game itself is pretty interesting. And having downloaded a few of the first episodes of Pokémon, it stays true to the story line. I did read an article saying that the game lacks the heart of the show — pfft, whatever. It's about beating your opponent and building your Pokémon army, friendships are secondary, dude!
So if I had to look ahead 5 years, I'd think Niantic would create a convention, and at the convention, hold live gaming tournaments. Only people at the conventions could catch super-rare Pokémon and collect convention medals. And then, and only then… after about 5 of these happening, will this fad die out. Until then, Pikachu, I choose you!
Previous story What am I watching/reading?


text:
Q: CA1726: FxCop Forbidden Word: Flags someone wants me to make other people's code compliant to some FxCop ruleset which includes rule CA1726:Use preferred terms. Most of the terms/replacements are all right and I can understand that one has to decide on one single way to name things.
However, what's the deal with the term 'flags'? Can anyone explain to me why I shall not use this name? (before I go and complain about it at my boss ;) )
Say, I have a data object which has a member of class 'flags' which bundles a large number of properties that define how to handle the data object. How else would you call this?

A: I would say that the property should be named aptly, and that the term Flags characterises the property rather than describing it.

Flag or Flags | There is no replacement term. Do not use.

For instance, Flags is generally used with enumerations (that are decorated with the appropriate attribute) and we certainly don't need to explicitly state so within the name / identifier of a property:
[Flags]
enum StorageMode
{
    None = 0,
    Next = 1,
    ...
    Last = 32
}

class StorableItem
{
    public StorageMode StorageMode { get; set; }
}

But, in your case, I get the feeling that whatever is named, or contains within its name, Flags, isn't actually a set of flags in the above sense - which just brings up another reason as to why to avoid it.

A: In the book Framework Design Guidelines, which is what FxCop is based on, the authors say that using Flag or Flags is a bad idea.  Their alternative suggestion is that when naming enumerations that you use a singular name for standard enums and a plural name for bit field (flags) enums.
For example if you wanted to create an enum listing different visibilities then you would name it Visibilities instead of VisibilityFlags or Visibility:
[Flags]
public enum Visibilities {
   Public,
   Private
}

The only items considered flags in .NET by the authors are these bitfield enumerations due to the keyword Flags attribute.


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text:
Marketing Primer, Part II: Getting the Word Out
Time: 6:30pm-8pm
It's all well and good to write a book and get it published but if no one knows about it, you'll never sell a copy, other than to friends and family. In Part I (Feb), our guest speakers shared how to design an ad and get the maximum mileage out of advertising it on Facebook. This month, we'll talk about publicizing your work by attracting the interest of libraries, book clubs, review sites, and podcasters. Don't miss this program—it could help propel your readership skyward!
Our Speakers Include:
Brian Kenney. A librarian and editor, Brian has worked for libraries across New York City, including many years at the Brooklyn Public Library. An editor at Library Journal (LJ) and editor in chief of School Library Journal (SLJ), he was also editorial director of Publishers Weekly, LJ, and SLJ. He's served on several award committees, including the American Library Association's Notable Books Council and the Andrew Carnegie Medals for Excellence, and is a member of the advisory committee for Booklist magazine. He is the director of the White Plains Public Library (NY), where he runs Book 'Em, a lively crime fiction book group. Along with Etta, he co-founded First Clue, a weekly crime fiction newsletter. The two also published the Mystery Preview—looking ahead at the next nine months of crime publishing—in the March issue of Library Journal.
Henrietta (Etta) Verma is a coauthor of weekly crime fiction newsletter First Clue, author of How to Get Your Book Into Libraries, and a librarian and editor. She is a former head of Library Journal's book review section and was previously an editor at School Library Journal's book review. Etta currently works for an academic publisher and in her spare time devours two crime novels per week for First Clue, as well as writes and edits reviews at Booklist magazine. Originally from Ireland, Etta now lives in New York City with her two children. Find her on Twitter at @1stClueReviews.
Sara Rosett is USA Today bestselling author who writes lighthearted mysteries and is the co-host of the Wish I'd Known Then Podcast, geared for writers. She is also the author of over 30 novels in the genres of cozy and historical mystery. Sara writes nonfiction for authors, including How to Write a Series and How to Outline a Cozy Mystery. Find out more at https://www.SaraRosett.com.
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text:
An Informal Conversation with Lord Meghnad Desai
Lord Meghnad Desai – Emeritus Professor LSE, Chairman MDAE
Lord Meghnad Desai delivers a virtual talk at Meghnad Desai Academy of Economics Meghnad Desai Academy of Economics (MDAE) is delighted to announce that Lord Meghnad Desai, Chairman, Meghnad Desai Academy of Economics, renowned academic, Professor Emeritus at the London School of Economics recently delivered a talk at the live online session. MDAE Directors, Board Members, Faculty Members, Academic Consultants' Committee of MDAE and other eminent professors from renowned colleges across India like Fergusson & Symbiosis (Pune), Guru Gobind Singh, Daulat Ram & Satyawati College (Delhi), Kumaraguru College of Liberal Arts & Science, (Coimbatore), K.J. Somaiya, Hinduja College of Commerce, Jai Hind, Ramnarain Ruia & HR college (Mumbai), St. Xavier's (Ahmedabad) attended the session. In the extremely engaging and enriching session, Lord Desai touched upon the various current economic issues and news around the world. Talking about MDAE, Lord Desai highlighted the emphasis on practical education and applauded the academy for its efforts to provide quality education. He spoke about his new book which is due for a launch "Poverty of the political economy" based on increasing hostility of economy to the poor and the disparity between rise in income tax rates vs allowance to the underprivileged and why this kind of economic policy became acceptable and came to be known as a sound economic policy. "Economics is never out of fashion and is always developing", mentioned Lord Desai while talking about the new global events especially the Russia-Ukraine Crisis. Lord Desai opened the floor for questions to keep the session engaging & answered various questions posed to him with a great delight. While talking about Bitcoins and cryptocurrency, he mentioned how Bitcoin is a paradox for economics something which is of no use has exchange value. "Crypto currency is a success only in the idea that you can give it away or else you sell it (it is called boost-trap equilibrium). He also emphasized on how Indian government should assume the role of regulator and not that of a controller. Talking about Inflation & Oil prices, he mentioned an historic event in the 70s where the price of oil increased by $5 (along with the effects of stagflation) and drew the comparison with current situation due to Russia-Ukraine crisis. In his closing remarks, he said we need to relook at economics from fresh perspective, where we value human life and how preserving human life should be the topmost priority of economic policy & advocated the detour towards development economics. About MDAE: Meghnad Desai Academy of Economics (MDAE) Situated in Mumbai, is one of India's leading post graduate academy specializing in the Economics, Public Policy, and Finance. Established as an institution of excellence to equip graduate students with applied skills to meet the needs of the new-age workplace, MDAE offers full time Post graduate Programs and short-term online certifications that prepare students for the globalized and dynamic workplace. Our board comprises Lord Meghnad Desai (Life Peer, House of Lords), Dr. Ajit Ranade (Chief economist, Birla Group), Tushar Poddar (Macro Strategist, Wellington Management), Niranjan Rajadhyaksha (Research Director, IDFC Institute), PD Singh (MD, JP Morgan) and Mangal Goswami (Deputy Director, IMF). Visit, https://www.meghnaddesaiacademy.org/ to know more about us.


Don't let bad habits hinder your advancement in learning Spanish, like it did Michael Evans.
When I arrived in South America over five years ago, my Spanish vocabulary was limited to just a few words. Learning and remembering nouns seemed particularly challenging, but I was delighted to discover that many Spanish words sound very similar to their English equivalent.
For example, an office is an oficina and a bank is a banco.
"If you don't know the name of something," someone told me, "add an 'o' or 'a' to the end of the English word. You'll be surprised how often it works." That sounded like a good idea, so I tried it, and it did work, at least some of the time. But what started as a handy crutch morphed into something else that ended up hindering my learning.
I started applying the method to Spanish words that do not sound like their English equivalent. It was a new language, which I created to amuse myself. A pocket became a pocketa and windows became windowetas. My inventory expanded, engulfing adjectives. When I was dressed and ready to leave my house, I was readyeta. When my stomach began to growl, I was hungryeta.
My bilingual friends learned the new words and usually played along. But my laziness was setting me back. I was not developing a vocabulary to call upon, and I was not practicing pronunciation, which can mean the difference between clear communication and total disaster.
One day I decided to take my favorite pair of jeans to the tailor for a few repairs. They still looked snazzy, but I was getting tired of coins slipping through holes in the pockets. After enjoying lunch with a Colombian friend, we headed to a street lined with tailor shops. I knew just where I wanted to go, a shop owned by an ancient old man who uses a beautiful antique sewing machine. I asked my friend for the real word for pocketas. "Bosillos," he said. Bosillos, bosillos, bosillos, I practiced repeatedly in my mind, as we ambled along.
"I think we should go to another place. I have a bad feeling about this," my friend said as we arrived at the shop. I assured him that all would be okay; I had employed the man before, and his work was excellent. I explained to the tailor the nature of the repair I needed. Although I stumbled a few times over bosillos, and the man seemed a little hard of hearing, he seemed to understand what I was saying. I left with an air of confidence, but my friend still seemed concerned. I felt a little uncertain about how well I had communicated, but I brushed the fears aside. After all, a man with such vast knowledge and such a lovely sewing machine could never let me down.
The next day, my friend and I returned to the tailor shop. The man handed me the neatly folded jeans and I stuck my hand in one of the pockets. It still had a hole. The other pocket still had a hole, too. Then I held up the jeans and let them unfurl. My jaw dropped and my eyes widened.
"I told you I had a bad feeling," my friend said, rolling his eyes.
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British Prime Minister David Cameron came to the House of Commons armed with an intelligence dossier from the Joint Intelligence Committee, as well as a legal opinion from the Attorney General. He narrowly grounded his case for military action against Assad's regime on the need to deter further use of chemical weapons. Despite the Prime Minister's attempts to preempt concerns of post-Iraq war weariness or fear of unintended consequences, his government's motion was defeated 285 to 272.
While President Obama had not reached a decision yesterday about the way to proceed with Syria, 116 members of the US House of Representatives, most of them Republicans, signed a letter [PDF] urging him to consult Congress before launching strikes. Like many, House Armed Services Committee Ranking Member Adam Smith [D-WA] is circumspect about the effectiveness and ultimate consequences of such an intervention.
Latest updates[?]: New award will inaugurate new Talon MEDEVAC sensor turret; Sikorsky to install more Star SAFIRE II units.
Pressure mounts for strikes on Syria over apparent use of poison gas. The US Administration is signaling that it will conduct a "punitive strike." This would express moral outrage and convey a sense that President Obama's threats mean something. But hopes of accomplishing meaningful progress towards putting an end to the civil war, let alone helping Syria reaching a state of balance aligned with Western interests, are very scant at best.
Latest updates[?]: Developments since 2011 include Pentagon DWSS cancellation, NASA/NOAA launch & operation of NPP Suomi, and continued progress on the civilian JPSS. Also article & formatting updates.
The National Polar-orbiting Observing Satellite System (NPOESS) was a joint program of the Department of Defense, Department of Commerce and NASA to replace less sophisticated weather satellites that are expected to fail over the next several years. It would help develop 3-7 day weather forecasts for civilian and military purposes, including weather like hurricanes, tornadoes, etc. Unfortunately, the program ended up billions over budget, and 6 or more years late. Some gaps in coverage are possible during that time, if enough older satellites fail.
In November 2005 testimony given at a House of Congress Science Committee hearing, the Administrator of NOAA and the Undersecretary of the Air Force promised new cost and schedule estimates and policy options, as well as fuller and more rapid information. NPOESS was openly described as "a program in crisis." Just under 5 years later, that crisis came to an end with a program split into civilian (JPSS) and military (DWSS) systems, and a 5-year NPOESS Preparatory Project (NPP) satellite that will test key instruments and serve as a capability bridge.
The Obama administration appears to both think the Syrian government did use chemical weapons against civilians, and prepare a strike in response. This would possibly but not necessarily be done with UN backing, while the British Royal Navy is moving ships in preparation of possible missile launches. It's hard for UN inspectors to do their job when snipers shoot at them. One question among several pressing matters: what was used? WSJ | NYT | WaPo | Christian Science Monitor | UK Telegraph.
Latest updates[?]: India issues their RFP - have they created problems for themselves with the requirements?
In January 2009, the wheels began turning on pair of follow-on buys covering short and medium range manned aircraft for India's Navy and Coast Guard. That effort stalled out, restarted with a 2013 RFP.
India's growing power is creating growing naval responsibility around the Indian Ocean, from the strategic chokepoint and shipping channel represented by Indonesia's Straits of Malacca in the east, to anti-piracy operations off the coast of Somalia and basing agreements with Madagascar in the west. Hence the January 2009 deal for 8-16 of Boeing's 737-derived P-8i Poseidon maritime patrol aircraft, which will replace Russian-built TU-142s as India's long-range patrol aircraft.
Closer to home, however, India has its own long coastline to patrol, and neighbors like Bangladesh, Sri Lanka, and Pakistan that represent existing or potential trouble spots along its borders. The P-8i will work in those problem areas, but less-expensive and shorter-range aircraft are needed to supplement their coverage. Inshore, and at strategic locations like Nicobar Isand, new Dornier Do-228NG aircraft, and UAVs like India's Israeli-built Searcher and Heron UAVs, provide solid local coverage. In between, medium sized manned aircraft must fill their own niches in India's Navy and its Coast Guard.
General Dynamics won the Ground Mobility Vehicles 1.1 competition for US Special Operations Command (SOCOM), with a contract worth up to $562M over 7 years.


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You mean stretch it out?
i mean water in game.. Look my irons forest map and you will see whats look like.. And you will see what i mean.
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Yeh, but how is the progress now?
Quite busy with school atm.
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Also updated 1st post with dl link etc.
Shi No Numa beta 1.0 is on the server!
Ask an admin or vip to load it up, if you want to see it.
Please report any bugs / glitches here.
- Improved spawns and windows.
- Flogger is now available for use!
- Some areas that are not detailed yet & lighting / fx.
Moving on to the stand-alone!
I want to thank everyone for their support and advice in this part of my life.
It has been a great honor to work with all of you, learn from you, and teach others aswell!
It's been a fantastic 4.5 years!
This won't mean i'll stop playing ZombieX, but i'll be focusing more on the development of ZombieX on steam.
Once again, thank you all for making me be what i am now. Im glad i could be a part of ZombieX and now bringing it to a new height.
I hope to see you all on ZombieX' Alpha, Beta and the release on steam!