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• Sound Waves Visualized with a Chladni Plate and Colored Sand [Video]

  - by Jason Fitzpatrick

  This eye catching demonstration combines a Chladni Plate, four piles of colored sand, and a rubber mallet to great effect–watch as the plate vibrates pattern after pattern into the sand. A Chladni Plate, named after physicist Ernst Chladni, is a steel plate that vibrates when rubbed with a rubber ball-style mallet. Different size balls create different frequencies and each frequency creates a different pattern in the sand placed atop the plate. Watch the video above to see how rubber balls, large and small, change the patterns. [via Neatorama] Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• restore default css attributes

  - by pstanton

  hi all. i'm writing a component that is to be used across multiple websites. each website has it's own stylesheets and displays certain things differently. all of my html is wrapped within a div with an id: <div id="myComponent">...</div> my component however is to look consistent across all of the sites. this is fine as i apply styling to most of the attributes in my component. div#myComponent p {font-size:11px;} etc however i've come across a site that removes the border from all input fields input {border: medium none;} i need to 'un-apply' this directive for the input fields within my component, and preferrably use the browser's default styling for inputs, as the border style for input type="text" will need be different to input type="button". how would you achieve this?

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• How can I access the ListViewItems of a WPF ListView?

  - by David Schmitt

  Within an event, I'd like to put the focus on a specific TextBox within the ListViewItem's template. The XAML looks like this: <ListView x:Name="myList" ItemsSource="{Binding SomeList}"> <ListView.View> <GridView> <GridViewColumn> <GridViewColumn.CellTemplate> <DataTemplate> <!-- Focus this! --> <TextBox x:Name="myBox"/> I've tried the following in the code behind: (myList.FindName("myBox") as TextBox).Focus(); but I seem to have misunderstood the FindName() docs, because it returns null. Also the ListView.Items doesn't help, because that (of course) contains my bound business objects and no ListViewItems. Neither does myList.ItemContainerGenerator.ContainerFromItem(item), which also returns null.

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• Why don’t UI frameworks use generics?

  - by romkyns

  One way of looking at type safety is that it adds automatic tests all over your code that stop some things breaking in some ways. One of the tools that helps this in .NET is generics. However, both WinForms and WPF are generics-free. There is no ListBox<T> control, for example, which could only show items of the specified type. Such controls invariably operate on object instead. Why are generics and not popular with UI framework developers?

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• How do I handle a user story that I complete, but with compromise and need to revisit?

  - by ProfK

  I have just fulfilled (is that a good term?) two user stories out of a new project backlog I have just built. These are user registration and password reset, both requiring mail. I need to implement a substitute mail component because my initial choice, and a normally reliable one, wasn't working. Because I was focused on delivering the user stories, not debugging the mail component, I swapped it out to deliver working code at sprint end. Do I now log a new support issue for the mailer, or 're-insert' these stories into the backlog? If I do the latter, am I not introducing too much tech detail into user stories?

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• Dislpay List and transformation

  - by Gary

  Greetings! I have this question. Whenever, I enter a transformation (gltranslate, glrotate, glscale) within a display list, the transformation remains as a command within the display list. Everytime the display list is rendered, it will calculate all and over again. Is there a way, I can make an opengl transformation and the transformed vertex coordinates be stored permanently in a display list instead of transformation & intial coordinates? Hope my question makes sense. Thank you in advance. Gary

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• Subversion import error 200030 (accessed from SCM in Xcode 3.2.2, OS X 10.6.3)

  - by Global nomad

  Hi, I'm encountering the following error when attempting to (svn) import from within Xcode). Import Failed Error: 200030 (SQLite error) Description: no such table: rep_cache This is a new repository.The svnserve process runs normally. Existing repositories work fine (import, commit, and export) from within Xcode. Neither MacPorts nor Fink are installed. The binaries in /usr/bin comes with Mac OS X 10.6. I've googled but am unable to find others encountering the same issue. Thanks in advance for any shared insights.

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• Ubuntu won't boot, only displays GRUB terminal

  - by Badea Sorin

  I have a problem with my Ubuntu 11.04. I've installed Ubuntu 11.04 from Windows, it worked fine for days, but today it won't boot. When I start the machine, GRUB loads. There is the Windows 7 loader, I select Ubuntu from there and after that, I should see the Ubuntu GRUB menu, where I'd select the mode to boot Ubuntu. However, I can't see that anymore. I directly get to a GRUB terminal. Can anyone help me with this? How would I recover my data or reset the boot loader?

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• 3d transformation of game world keeping gameplay 2d - COCOS2D 2.0

  - by samfisher

  Using: COCOS2D + iOS. I want to rotate the game world, may be loading another .tmx file for another dimensions when user want to switch dimension. the effect what I am looking for is something like this:CLICK HERE What I have thought of till now: rotating CCCamera will be mandatory. Question: How will I have the other part of the level in place while the camera rotates/rotating? I can load a CCSprite and rotate it accordingly to the 3rd dimension. phew..!! Question: When the camera and world is rotated, will the player controls work properly.. I think not...? I think a better option would be to checkout with COCOS3D... there I could implement 3d world... right?? Question: Not sure how well 2d dynamics will work there as I want to user Box2d as physics engine.. could anyone provide suggestions? Regards, Sam

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• Intel HD graphic drivers for ubuntu 10.10 64bit: the brightness says its being adjusted but it isn't

  - by James

  Hey all, I picked up an hp dm3t laptop with intel HD graphics and installed ubuntu 10.10 64 bit on it. It works great -- the only problem is that the brightness controls on the keyboard don't work. The brightness is always at full. When I try to adjust it down, the indicator graphic indicates that it's going down but the actual brightness doesn't change. Is there anything that I can try to make this work? I'd really appreciate any help. I asked this on superuser.com and someone commented that I should play around with the intel hd drivers. I'm a total noob -- how do I do that? What else can I try? I reallly don't want to do back to windows.

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• opening a file attachment from an outlook email using clickonce and a file association

  - by MarkGr

  Hi, I have a clickonce application (VS2010, .NET 4). I have registered a file association (.task), and this all works well. If I double click a file with the .task extension on the desktop the clickonce application opens and can open the file. If I email the file however, and double click the file from within outlook, I get the open/save dialog. If I click open nothing appears to happen. If I save the file I can open it by double clicking on it. Any ideas why the file does not open from within outlook ? Thanks, Mark

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• help with regex pattern

  - by noname

  i have multiple strings containing a link like: <A HREF="http://www.testings2">testings2</A> <A HREF="http://www.blabla">blabla</A> <A HREF="http://www.gowick">gowick</A> i want to use a regex pattern that gets the uri within the href. i could do like: /".*?"/ but then the "" will come along. is there a way to just get the uri within the HREF="" without using preg_replace function? thanks!

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• Save Web Content Directly to Google Drive in Chrome [Extension]

  - by Asian Angel

  Are you looking for a quick and easy way to save images, documents, and more directly to Google Drive while browsing? Then you may want to grab a copy of the ‘Save to Google Drive’ extension for Chrome. Once you have installed the extension it is very easy to start saving all that wonderful web content to your Google Drive account via the Context Menu or the Toolbar Button as seen in the screenshot above. One thing to keep in mind is that the first time you use the extension you will be asked for permission to access your account as seen in the screenshot below. Here is a quick look at the options currently available for the extension… Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• Sitecollection Overview Page

  - by ronischuetz

  I have the following situation: MOSS 2007 Server Environment A - Intranet MOSS 2007 Server Environment B - Collaboration Environment (approx. 150 site collections for various issues) Both environments are on different infrastructures but we use the same Active Directory and the same groups. Now we would like to implement the following 2 things: An overview page within the intranet with all available site collections on environment b. An overview page within the intranet with only those site collections the user has access on. now i'm searching for some good ideas what would be the best way to realise something like this. thanks in advance for any response.

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• Running NUnit tests in Visual Studio 2010 with code coverage

  - by adrianbanks

  We have recently upgraded from Visual Studio 2008 to Visual Studio 2010. As part of our code base, we have a very large set of NUnit tests. We would like to be able to run these unit tests within Visual Studio, but with code coverage enabled. We have ReSharper, so can run the tests within Visual Studio, but it does not allow the code coverage tool to do its thing and generate the coverage statistics. Is there any way to make this work, or will we have to convert the tests over to MSTest?

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• Windows Phone 7 DatePicker gotcha

  - by David Turner

  The Silverlight Toolkit for Windows Phone adds some great extra controls for Windows Phone 7, one gotcha that I ran into was that the DatePicker Application Bar icons don’t show up unless you include them in your project. The problem is that your DatePicker ends up looking like this: Tim Heuer mentions this in his blog post about the Silverlight Toolkit for WP7, and as he says, it is documented in the source code: So the problem is that the icons can’t be referenced from the Silverlight Toolkit Assembly, and the solution is that you have to add them to you project in the ‘well known’ / pre-defined location of a top level folder in your project called Toolkit.Content, and you must make sure to mark the icons with a Build Action of  ‘Content’ otherwise it wont work: The result is that your DatePicker will now look like this:

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• Secure Yourself by Using Two-Step Verification on These 16 Web Services

  - by Chris Hoffman

  Two-factor authentication, also known as 2-step verification, provides additional security for your online accounts. Even if someone discovers your password, they’ll need a special one-time code to log in after you enable two-factor authentication on these services. Notably absent from this list are banks and other financial institutions. It’s a shame that you can use two-factor authentication to protect your in-game currency in an MMORPG, but not the real money in your bank account. Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• xkb for simple remap

  - by Den Rimus

  I've faced some issues after remapping keyboard with xmodmap: settings get reset randomly after 2-20 minutes after applying. Googled it but no help: something resets them, but all mentions apply to xfce, while I'm under usual 14.04 Ubuntu with unity. I saw phrases like 'use xkb, forget xmodmap', but still have no idea how to do that. It's either classified or very complicated, because amount of info on that is significantly smaller than for xmodmap way. Here's my list of customisations: xmodmap -e "keycode 84 = Down" xmodmap -e "keycode 79 = Home" xmodmap -e "keycode 80 = Up" xmodmap -e "keycode 83 = Left" xmodmap -e "keycode 85 = Right" xmodmap -e "keycode 87 = End" xmodmap -e "keycode 90 = Insert" xmodmap -e "keycode 91 = Delete" xmodmap -e "keycode 89 = Next" xmodmap -e "keycode 81 = Prior" where keycodes are corresponding keys on numpad, with numlock = off (basically, I'm replacing KP_Del with Delete, KP_Home with Home etc - don't ask why)) Can someone help to find a way to do that using xkb - at least one of the lines? And where to find the "names" of keys for other so I could do the rest by example?

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• Eliminating code duplication in a single file

  - by Jon

  Sadly, a project that I have been working on lately has a large amount of copy-and-paste code, even within single files. Are there any tools or techniques that can detect duplication or near-duplication within a single file? I have Beyond Compare 3 and it works well for comparing separate files, but I am at a loss for comparing single files. Thanks in advance. Edit: Thanks for all the great tools! I'll definitely check them out. This project is an ASP.NET/C# project, but I work with a variety of languages including Java; I'm interested in what tools are best (for any language) to remove duplication.

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• Django admin urls return INVALID REQUEST! - Django

  - by RadiantHex

  Hi folks, my admin urls are sat behind a prefix by doing the following. 1# (r'^admin/', include(admin.site.urls)), is placed within urls_core.py 2# (r'^api/', include('project.urls_core')), is palced within urls.py All admin URLs work fine except app indexes. If I go to any URL such as: /api/admin/core/ /api/admin/registration/ /api/admin/users/ /api/admin/filters/ I receive 'INVALID REQUEST' as my response. Status code is 200 (OK) though. I have never received this error message before. Does anyone have a clue? Thanks guys!

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• CSS for https urls

  - by Vincent

  Hello, looking for some help with images referenced within the stylesheet. I have no problems with these from non secure locations within the site but only from https. The stylesheet loads fine and displays everything correctly except for the images. example: body { margin: 0; padding: 0; background: url(/img/background_tile.gif) top left repeat-x; text-align: center; background-color: #fff; } All my css files and other image paths inside the code use relative urls to images. How can I make sure they all work fine without hard coding my image paths with https or http? I want the code to work fine with http and https. Thanks

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• How can I improve overall system performance?

  - by Decio Lira

  What are your tips for improving overall system performance on ubuntu? Inspired by this question I realized that some default settings may be rather conservative on Ubuntu and that it's possible to tweak it with little or no risk if you wish to make it faster. This is not meant to be application specific (e.g. make firefox load pages faster), but system wide. Preferably 1 tip per answer, with enough detail for people to implement it. A couple of mine would be: Install Preload (via Software Center or sudo apt-get install preload); Change Swappiness value - "which controls the degree to which the kernel prefers to swap when it tries to free memory"; What are yours? PS: Since this is not intended to have a unique answer but rather, several useful tips, I'm making this community wiki out-of-the-box.

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• PHP class constant string variable spanning over multiple lines

  - by ebae

  I want to have a string variable for a PHP class, which would be available to all methods. However, this variable is quite long, so I want to separate it into multiple lines. For example, $variable = "line 1" . "line 2" . "line 3"; But above doesn't work. I tried EOD, but EOD is not allowed within class. And when I declare it outside the class, I can't access the variable from within the class. What is the best way?

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• Portal Ported to a Graphing Calculator

  - by Jason Fitzpatrick

  It’s not exactly a 3D-rendered GPU-burner, but this calculator-based version of Portal still features the same portal-jumping tricks that delighted players in the original game. Built using Axe Parser, an advanced programming language for graphing calculators, Portal: Prelude is part an experiment in pushing the limits of Axe Parser and part long standing tradition of porting popular video games to graphing calculators. You can read more about Axe Parser and the many games and program projects under development using it here. [via Geeks Are Sexy] How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot Our Geek Trivia App for Windows 8 is Now Available Everywhere

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• New DevExpress Web.Config Settings

  Starting with DXperience v2010.1, were making a small and useful change. Were adding a new section to the web.config file for settings used by DevExpress ASP.NET controls. New Section Heres the default section that youll find at the bottom of a new web project using DXperience v2010.1 release: <devExpress> <compression enableHtmlCompression="false" enableCallbackCompression="true" enableResourceCompression="true" ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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