Visit http://www.autonetwork.com for the largest collection of new car introductions.
Volvo designers Geza Loczi and Steve Martin gives you a walk around the SCC Concept Car at the Volvo Design Center in Gothenberg, Sweden. Volvo C30.
http://www.dailymonster.com — Timelapse video of Stefan G. Bucher of http://www.dailymonster.com creating a brand new monster every week.
RCL + Diode Snubbers. Part of a series of videos on the design of snubber circuits for power electronics by Rudy Severns.
Hello, I’m Rudy Severns, and welcome to my office. I’m writing a book on the design of snubber circuits for power electronics. In fact the books title will be “Snubber Circuits for Power Electronics”. What I would like to do now is share with you the contents of one of the chapters so you can get a really good feeling for what this book is all about.
Now we’ve talked a little bit about passive snubbers, just simple RC damping networks. These are very useful and very popular, but very, very often that’s not enough. You can’t do everything with a simple RC snubber.
What happens is if you add a diode to the network you can then do more, more types of snubbing and control of the losses in the switch. So the next class of snubbers, and again we have devoted an entire chapter to it, will be called RCRL Diode Snubbers. In other words, they include capacitors, inductors, resistors, and diodes.
These are generally dissipative snubbers. Now, that doesn’t mean that all the energy that’s saved in the switching, because the snubbers will actually reduce the switch loss, but not all of that power needs to be dissipated, but generally speaking, you’d only save maybe ten or 20%. So a well-designed RCD snubber will actually improve the overall efficiency, but not by a large amount.
It should sort of be a little icing on the cake, just help you out a bit. But what it does for the performance of the switch and the reduction of switch stress is what’s so very important about this family of circuits. And again, what we’ll do is we’ll approach it by, first of all, talking about turn-on snubbers. In other words, a snubber that’s effective as you turn on the switch and reduces the stress in the switch at turn on.
Then we’ll talk about turn-off snubbers. In other words, snubbers that operate when the switch is turning off. Finally, we’ll talk about many different kinds of combination snubbers. In other words, these are snubbers which are working both at turn on and at turn off. We’ll find that there are some very interesting optimization problems that have to be solved there.
In fact, some of the most popular of the turn-on, turn-off combination snubbers, the very most popular one cannot actually be optimized at both ends, it’s always a compromise. So you end up with a trade-off. That particular trade-off will be treated carefully in this chapter.
http://freelinereport.com
Facebook has started testing its own instant messaging, causing concern with other third party applications that already provide this functionality. Like GTalk, this will be built on the Jabber platform, and will also work right in the web browser, letting users chat with their friends directly from their profile.
http://freelinereport.com/freeline-3-18-08
Looks like the new iPhone SDK won’t be as easy to get a hold of as originally announced. Many developers, from professional to hobbyist alike, got rejection letters from Apple this week saying that they would not be getting the much desired iPhone SDK. So far very few people have reported acceptance, and so far there seems to be nothing outstanding that separates the accepted from rejected.
http://freelinereport.com/freeline-3-18-08
Are you a web designer that is in love with Photoshop, but you don’t know how to make it really sing yet? We’ve got a link to a great tutorial site and, for example, a specific lesson that shows you how to make photorealistic reflections with a few simple tools.
http://freelinereport.com/freeline-3-18-08
Yahoo has joined the next generation of web development — Web 3.0 anyone? — by announcing support for numerous semantic web formats. Included are RDF and microformats which make it easier to share personal data and calendars online across multiple formats. Expect a flurry of websites updating to support these formats, so that they can keep bringing in traffic from Yahoo’s search results.
http://freelinereport.com/freeline-3-18-08
“Visualization” is all about hot new technologies that turns complex information into something understandable, with different visual graphs. We’ve got a link to the best tools for visualization, including free programs that can parse complex data very easily and give you cool graphical results fast. It includes tools for Digg, Amazon, Last.fm and many others, allowing you to leverage the internet to show your stuff in whole new ways.
http://freelinereport.com/freeline-3-18-08
http://freelinereport.com
Facebook has started testing its own instant messaging, causing concern with other third party applications that already provide this functionality. Like GTalk, this will be built on the Jabber platform, and will also work right in the web browser, letting users chat with their friends directly from their profile.
http://freelinereport.com/freeline-3-18-08
Looks like the new iPhone SDK won’t be as easy to get a hold of as originally announced. Many developers, from professional to hobbyist alike, got rejection letters from Apple this week saying that they would not be getting the much desired iPhone SDK. So far very few people have reported acceptance, and so far there seems to be nothing outstanding that separates the accepted from rejected.
http://freelinereport.com/freeline-3-18-08
Are you a web designer that is in love with Photoshop, but you don’t know how to make it really sing yet? We’ve got a link to a great tutorial site and, for example, a specific lesson that shows you how to make photorealistic reflections with a few simple tools.
http://freelinereport.com/freeline-3-18-08
Yahoo has joined the next generation of web development — Web 3.0 anyone? — by announcing support for numerous semantic web formats. Included are RDF and microformats which make it easier to share personal data and calendars online across multiple formats. Expect a flurry of websites updating to support these formats, so that they can keep bringing in traffic from Yahoo’s search results.
http://freelinereport.com/freeline-3-18-08
“Visualization” is all about hot new technologies that turns complex information into something understandable, with different visual graphs. We’ve got a link to the best tools for visualization, including free programs that can parse complex data very easily and give you cool graphical results fast. It includes tools for Digg, Amazon, Last.fm and many others, allowing you to leverage the internet to show your stuff in whole new ways.
http://freelinereport.com/freeline-3-18-08
interviju na RTVSLO za oddajo 8dan
Saudi singer Wa3d song “3la meen” I love this song.
AIAA Design Build & FLy Competition ‘08 @ GIK Institute ! ,The take off of the winning plane !
Cargo loaded flight, followed by a leisure flight afterwards.
Insane winds… but it flew anyways. Might have performed better with cargo.