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  • Optical Illusion Freezes Water In Place [Video]

    - by Jason Fitzpatrick
    This clever optical illusion uses sound frequency and a digital camera to “freeze” water in time and space. YouTube user MrBibio explains the hack: Creating the illusion of a static flow of water using sound. Of course this isn’t my idea and plenty more refined examples already exist. I tried this same experiment years ago but using a strobe light, but it’s harsh on the eyes after a while and hard to video successfully. It only dawned on me shortly before making this that for video purposes, no strobe light is required. This is because the frame rate and shutter of the camera is doing a similar job to the strobe. The speaker-as-frequency-generator model is definitely easier on the eyes than similar experiments that rely on high-speed strobes. How to Stress Test the Hard Drives in Your PC or Server How To Customize Your Android Lock Screen with WidgetLocker The Best Free Portable Apps for Your Flash Drive Toolkit

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  • Where is a good place to start to learn about custom caching in .Net

    - by John
    I'm looking to make some performance enhancements to our site, but I'm not sure exactly where to begin. We have some custom object caching, but I think that we can do better. Our Business We aggregate news stories on a news type of web site. We get approximately 500-1000 new stories per week. We have index pages that show various lists of the items and details pages that show the individual stories. Our Current Use case: Getting an Individual Story User makes a request The Data Access Layer(DAL) checks to see if the item is in cache and if item is fresh (15 minutes). If the item is not in cache or is not fresh, retrieve the item from SQL Server, save to cache and return to user. Problems with this approach The pull nature of caching means that users have to pay the waiting cost every time that the cache is refreshed. Once a story is published, it changes infrequently and I think that we should replace the pull model with something better. My initial thoughts My initial thought is that stories should ALL be stored locally in some type of dictionary. (Cache or is there another, better way?). If the story is not found, then make a trip to the database, update the local dictionary and send the item back. Since there may be occasional updates to stories, this should be an entirely process from the user. I watched a video by Brent Ozar, How StackOverflow Scales SQL Server, in which Brent states "the fastest database query is the one that you don't make". Where do I start? At this point, I don't know exactly what the solution is. Is it caching? Is there a better way of using local storage? Do I use a Dictionary, OrderedDictionary, List ? It seems daunting and I'm just looking for some good starting points to learn more about how to do this type of optimization.

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  • All users of a group can edit each others files (Linux)

    - by Xeoncross
    I want anyone in group www-data to have write access to /var/www. For example, if 'a' and 'b' are in group www-data and 'a' creates a file in /var/www - then 'b' will be able to edit it. The problem is that I create files that PHP and Apache can't edit - and they create files I can't edit without sudo. I changed the umask setting /etc/profile from umask 022 to umask 002. Is this a safe and proper way to handle this?

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  • How to edit pdf metadata from command line?

    - by bdr529
    I need a command line tool for editing metadata of pdf-files. I'm using a Aiptek MyNote Premium tablet for writing my notes and minutes on this device, import them later and convert them to pdf automatically with a simple script using inkscape and ghostscript. Is there any command line tool to add some categories to the pdf's metadata, so i can find the pdf later (e.g. with gnome-do) by categories? Update: I tried the solution with pdftk and it works, but it seems that gnome-do doesn't take care of pdf-metadata. Is there a way to get gnome-do to do that?

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  • How to edit pdf metadata from command line?

    - by bdr529
    I need a command line tool for editing metadata of pdf-files. I'm using a Aiptek MyNote Premium tablet for writing my notes and minutes on this device, import them later and convert them to pdf automatically with a simple script using inkscape and ghostscript. Is there any command line tool to add some categories to the pdf's metadata, so i can find the pdf later (e.g. with gnome-do) by categories?

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  • How to use GCC 4.7 in place of 4.6 (Ubuntu 12.04)

    - by Larz Conwell
    So I'm working on a project and I wanted to use some C11 features for C. To use those features GCC 4.7 is required, so I went to synaptic and looked up 4.7, and I found the packages gcc-4.7-base so I installed it[1]. So now that gcc-4.7-base is installed I expected to be able to use 4.7, but no, when I do gcc --version it still shows 4.6.3 even more, when I try to directly call 4.7(via /usr/bin/gcc-4.7) it doesn't exist, though a gcc-4.6 executable does exist. How do I "activate" GCC 4.7? I read here, you do some crazy stuff with update-alternatives, but it doesn't work for me as the gcc-4.7 executable doesn't actually exist on my machine. Notes: 1. I also saw gcc-4.6-base, so I figured I'd uninstall it, but synaptic attempted to remove every package I had installed and install a Java runtime, so for obvious reason I decided not to remove it.

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  • Best place to put application files [closed]

    - by takeshin
    Possible Duplicate: 'Installing' Applications, where to put folders? Hello, Where shall I put applications which do not require install (extracted from archive)? E.g. java based programs executable scripts In two variants: for all users for one user Some times the archive itself contains directories like lib or bin. For example, apps like ArgoUML Shall I put all the apps in /usr/local/appname?

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  • Google Chrome arrache la deuxième place à Firefox en terme de parts de marché des navigateurs

    Chrome dépasse la barre des 10 % de parts de marché Safari atteint son plus haut historique Mise à jour du 02/02/11, par Hinault Romaric Le navigateur de Google continue sa progression. Au cours du mois de janvier, Chrome vient de franchir la barre symbolique des 10% (10,70% de part de marché) pour la première fois selon NetMarketShare. Le mois de janvier a été un mois record pour Chrome, mais aussi pour Safari, le navigateur d'Apple, qui a atteint pour la première fois 6,30% de part de marché. Internet Explorer en revanche a enregistré une baisse de près de 4% (56% de part de marché en janvier 2011). On note égal...

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  • Microsoft Access 2010: How to Add, Edit, and Delete Data in Tables

    Tables are such an integral part of databases and corresponding tasks in Access 2010 because they act as the centers that hold all the data. They may be basic in format, but their role is undeniably important. So, to get you up to speed on working with tables, let's begin adding, editing, and deleting data. These are very standard tasks that you will need to employ from time to time, so it is a good idea to start learning how to execute them now. As is sometimes the case with our tutorials, we will be working with a specific sample. To learn the tasks, read over the tutorial and then apply...

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  • Feature Driven Development in the work place?

    - by FXquincy
    Question Please explain Feature Driven Development in a nutshell? Situation My Business Analyst calls their documentation FDD, but it just seems overwhelmed by details. In a Nutshell An 'in a nutshell' example would be good, since I'm trying to reduce unnecessary detail and confusion. I want to add clarity, and an Occam's' razor approach to the documentation. Thanks for your help, Here's what I found

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  • Photos being copied all over the place

    - by plua
    We have a rather popular website with plenty of photos. Our whole business depends on our content - and the photos are important in this. We invest a lot of time, effort, and money into taking these pictures. On our website we have clear copyright notices, we have the website name and logo in the photos, and we have a Photo Licensing page which states the prices of licensing our photos. Despite all this, our photos are copied by personal and commercial websites alike. We really want to do something about this. We do not want them to take out the photos and leave it at that. We want them to pay for the usage, as we clearly state on our website. Now a few questions come to mind: Can we legally force them to pay right away? Or are we obligated to first write a "Cease and Desist" letter? Photos are used on websites throughout the world. Are there any worldwide rules for this? Has anybody experience with doing these things outside of their home country? Should we hire a lawyer in any country? Or could a local lawyer contact oversees companies directly?

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  • Best place to learn Component Object Model

    - by Ritwik G
    I need to learn COM for my current project. I am a noob and I haven't been able to find good starting points for COM. I have been looking into MSDN and googling... I did find some interesting articles on codeproject.com, but I am not satisfied. Why do we use COM ? Why does it exist ? In what places does it exist ? ..... and so on .. So, will you please tell me where can I find answers to these questions ?

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  • Where to place php libraries/extensions?

    - by gdaniel
    I am new to a lot of server configurations and options. I want to add extra php libraries/extensions to my server. Where do I add them? (I am on a CENTOS 6.5 VPS) For example, I want to add the phpseclib php extension: Their website instructions are minimum: Usage This library is written using the same conventions that libraries in the PHP Extension and Application Repository (PEAR) used to be written in (current requirements break PHP4 compatibility). In particular, this library needs to be in your include_path: <?php set_include_path(get_include_path() . PATH_SEPARATOR . 'phpseclib'); include('Net/SSH2.php'); ?> It tells me how to use it, but it doesn't tell me where to add the actual extension files. Should I added it under? usr/local/lib ? usr/local/lib/php ? usr/local/lib/php/pear ? Or can I add it under public_html? Also, my VPS has several users under /home/.. is that away to make the library available for only one user?

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  • Startup Edit

    This fully working program enables you to control what should and should not load automatically with Windows.

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  • how to calculate intersection time and place of multiple moving arcs

    - by user20733
    I have rocks orbiting moons, moons orbiting planets, planets orbiting suns, and suns orbiting black holes, and the current system could have many many layers of orbitage. the position of any object is a function of time and relative to the object it orbits. (so far so good). now I want to know for a given 2 objects(A,B), a start time and a speed, how can I work out the when and where to go. I can work out where A and B is given a time. so i just need. 1: direction to travel in from A to B(remember B is moving(not in a straight line)) 2: Time to get to b in a straight line. travel must be in a straight line with the shortest possible distance. as an extension to this question, how will i know if its better to wait, EG is it faster to stay on object A and wait for a hour when the objects may be closer, than to set off from A to B at the start. Cheers, it hurt my brain.

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  • User account that is not allowed to edit one file on Ubuntu

    - by spacemonkey
    Hi, I wanted to ask if it is possible to create a user account on Ubuntu so that it had all powers and rights of root account except it would be impossible to edit a certain file. What I intend to do is to edit host file in order to block access of certain websites, and then create a user account which would be the same as root account except it would be not able to edit host file. Maybe there is an easier way to block an access of certain sites forever? Thanks!

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  • How to Edit PDFs?

    - by snowguy
    I typically have two needs: Scenario A. Change a single PDF page. In this case I have a PDF but not the original source file used to create the PDF. I don't want to try to recreate the document from scratch. I'd like to open the PDF and change a few things. A good example of this scenario: I was responsible for planning a big event at a campground site, I had a PDF of the site. I wanted to start with that document, highlight some parts, add some labels, remove some parts that weren't relevant. or Scenario B. Combine PDFs or extract information from a PDF This scenario usually arises because I want a single PDF deliverable that is made up of parts that are best created in different programs. In this case I have the source files for all the documents but they don't play well enough together to easily create a single PDF deliverable. For part of it, I may want to use Libre Office Writer. For another page I may want to use Gimp. Still another page I may use Libre Office Calc. I could use Writer as the master document and embed images or the Calc object into that, but for ultimate control, you can't beat separate PDF documents that are then combined. What are the best tools / processes for editing PDFs in Ubuntu?

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  • Doing imagemagick like stuff in Unity (using a mask to edit a texture)

    - by Codejoy
    There is this tutorial in imagemagick http://www.imagemagick.org/Usage/masking/#masks I was wondering if there was some way to mimic the behavior (like cutting the image up based on a black image mask that turns image parts transparent... ) and then trim that image in game... trying to hack around with the webcam feature and reproduce some of the imagemagick opencv stuff in it in Unity but I am saddly unequipped with masks, shaders etc in unity skill/knowledge. Not even sure where to start.

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  • Menus don't sync in the first place

    - by Bruce Mincks
    I have been wrestling with prompts about my default key ring for months, finally made contact with Ubuntu with the right password, and find that when I try to sync evolution Ubuntu directs me to "system-preferences- " and then the road forks between the "passwords and encryption" you indicate and the "encryption and keyrings. I have no idea which version I am using, at this point. The road goes downhill from there. I would really like to synch my windows manager and Inkscape vs. ImageMagick display (circles display as semicircles). Can someone set me straight?

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  • Edit Your Images Online For Free With Aviary

    While looking for something to fill our Refresh Cartridges blog, we came accross this free online image editor and felt the need to create paper penguins with its help. In case you thought there was ... [Author: Chris Holgate - Computers and Internet - April 05, 2010]

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  • Why can I not edit, delete directories inside of this directory

    - by user43053
    Hello there, First, I thought this was PHP related, but maybe it isn't. My original post, which may be irrelevant now is located at the bottom. The problem is I have a directory : /articles/. In it are 10 sub directories. I have been changing the permissions lately, but now it seems all the permissions of the parent folder, sub-folders and files are either chmod 755 or 777. I cannot move, delete or edit files inside of this parent directory or sub-directories with my FTP-client. I can however edit, delete, create new files and directories and change them with PHP-functions without problems. What may the problem be? OLD POST. Ignore everything below this line: If I create a directory with mkdir(), or create a file with fopen(), file_put_contents() or SimpleXMLElement::asXML(), I am unable to access the file with my FTP-client or c-Panel File Manager. If I try to delete or edit them, I get errors. Dreamweaver suggests it is a permission problem or a network or filesystem fault (but I've set the permissions with chmod() to 0777, and when I check the cPanel, it confirms chmod 777. I also tried to use fileowner() and the function returns int(99), the same owner as those files that I could access with my FTP-client. It seems files and directories created with PHP can only be modified or be deleted with PHP. I thought this must be a server setup related issue, so I write it here. I am on a shared server, and I have no idea about setting up servers. EDIT: It seems the problem is different. I cannot move files with FTP-client to the parent, or sub-directories either. This problem may not be PHP related, then. It seems the problem applies to any directory, regardless of whether it was created by PHP. EDIT 2: The parent directory has chmod 755. Thank you for your time. Kind regards Marius

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