Solid Core Speaker Cable Benefits | Tech Channel - RadioShack. Adafruit Industries, Unique & fun DIY electronics and kits. Bending the Light with a Tiny Chip. An image of Hajimiri's light-bending silicon chip. Credit: Ali Hajimiri/Caltech inShare4 March 10, 2014 Imagine that you are in a meeting with coworkers or at a gathering of friends. The chip was developed by Ali Hajimiri, Thomas G. Traditional projectors—like those used to project a film or classroom lecture notes—pass a beam of light through a tiny image, using lenses to map each point of the small picture to corresponding, yet expanded, points on a large screen. Hajimiri and his colleagues were able to bypass traditional optics by manipulating the coherence of light—a property that allows the researchers to "bend" the light waves on the surface of the chip without lenses or the use of any mechanical movement.
"By changing the relative timing of the waves, you can change the direction of the light beam," says Hajimiri. Projections of the letters "CIT" made with the optical phased array (OPA) chip. "But I don't want to limit the device to just a few purposes. Sci.Electronics.Repair FAQ: Home Page. Unison Wiki | Main / UnisonFAQTips. I want to ignore deleted files. Is it a good idea to delete archive files after every synchronization, so that Unison consider all of my files as new and copies them on the replica where they are not ? I want to use Unison to synchronize really big replicas. How can I improve performance?
When you synchronize a large directory structure for the first time, Unison will need to spend a lot of time walking over all the files and building an internal data structure called an archive. There is no way around this: Unison uses these archives in a critical way to do its work. Next, you make sure that you are not "remote mounting" either of your replicas over a network connection.
If your replicas are large and at least one of them is on a Windows system, you will probably find that Unison's default method for detecting changes (which involves scanning the full contents of every file on every sync---the only completely safe way to do it under Windows) is too slow. Root = /home/bcpierce etc. #! Pros: DMD - Database Machine Drawings. Rich Hooper, PhD, PE: Robotics Engineer.
1. What are some of the advancements in robotics? The biggest advancements have been in the precision, speed and strength of robots. Learning and artificial intelligence algorithms have probably been the biggest disappointments. I don’t think we will see robots even remotely approaching human intelligence by 2050. 2. Artificial means not occurring in nature. 3. Probably some computer algorithm. 4. It is possible, but I wouldn't hold my breath waiting. 5. Learning algorithms and expert systems are two examples. 6.
I’m sure Honda has spent tens of millions of dollars on their Asimo. 7. It is possible, but more likely the people that made the robots would just turn them off before it got that out-of-control. 8. Surveillance robots do make excellent spies. 9. I think the field will grow. 10. I'm sure there are. 11. Nope. 12. You really have two choices. 13. When you first graduate college, you will be a very junior engineer. 14. I didn't take calculus or any AP classes in high school. 15. 16. 17. IOS - Intelligent Optical System Inc. Engineering Radio. The newish Nautel VS2.5 transmitter installed at WJJR had an RF module failure. This particular model transmitter does not have slide in RF modules as other Nautel transmitters do.
To fix this transmitter, it has to be pulled out of the rack, flipped over and opened from the bottom. The module replacement is very straight forward, there are five solder pads that connect to wires carrying the input, output, power supply and bias voltages. Nautel VS2.5 transmitter RF modules and combiner The troubleshooting guide gives good instructions on how to check the PA MOSFETS with a DVM. I found that 1/2 of the device in PA1 was bad: Schematic Diagram, NAPA31 All in all, not a very hard repair.
Killington Mountain, Killington, VT Killington Peak is the second tallest mountain in Vermont, topping out at 4,235 feet (1,291 meters). Even after reaching the parking lot, there is still a 10 minute walk to the peak, another 200 or so feet up a steep, rocky trail. WJJR WZRT ERI antenna Killington Peak tower. Meet Xiki, the Revolutionary Command Shell for Linux and Mac OS X. Command-line lovers, allow me to introduce you to Xiki, the incredibly interactive, flexible, and revolutionary command shell. I do not use the word "revolutionary" lightly. The command shell has not advanced all that much since the ancient days of Unix.
Xiki is a giant leap forward. If you're looking for the Next Big Thing in FOSS, Xiki is it. Figure 1: Editing a Web page with Xiki. Xiki merges shell and GUI concepts. It runs in a text editor, so everything is editable and you can save your Xiki sessions in text files. Currently Xiki supports Emacs, Vim, and Aquamax. You can download and install it from github.com/trogdoro/xiki. . $ git clone Cloning into 'xiki'... remote: Reusing existing pack: 6282, done. remote: Total 6282 (delta 0), reused 0 (delta 0) Receiving objects: 100% (6282/6282), 4.88 MiB | 239.00 KiB/s, done. Now run the xiki command: If you see all this, then Xiki is installed correctly and working. Figure 2: The Xiki Web control panel. DIY Electric Car Forums - Electric Vehicle Build and Conversion Community. Article: Examining Working Principle of Tesla Tower. Instructables - DIY How To Make Instructions. Nikola Tesla Patents. Tesla Turbine: Engine of the 21st Century?
The Tesla Turbine could far surpass the efficiency of the internal combustion engine. Recuperative hydraulics can be used for low-speed, high-torque needs. by Sterling D. AllanPure Energy Systems NewsCopyright © 2007 MUNISING, MICHIGAN, USA -- Nikola Tesla created an engine design nearly 100 years ago that is as much as three or four times more efficient than the combustion engine design that has dominated for reasons other than science. At the time of his invention around 1909, Tesla was able to demonstrate a fuel efficiency of 60% with his bladeless turbine design.
The politics of his day impeded Tesla's design from being implemented. Enter Environmental Scientist, Ken Reili , CEO of Phoenix Navigation & Guidance, Inc. Rieli and his associates in the popular Phoenix Turbine Builders Club that he founded, have resurrected and improved Tesla's Turbine design. In addition to transportation, potential applications range from home generators to public utilities to locomotive power.
Modern Data. TESLA TURBINE ENGINE NEWS. Classical mechanics. Diagram of orbital motion of a satellite around the earth, showing perpendicular velocity and acceleration (force) vectors. In physics, classical mechanics and quantum mechanics are the two major sub-fields of mechanics. Classical mechanics is concerned with the set of physical laws describing the motion of bodies under the action of a system of forces. The study of the motion of bodies is an ancient one, making classical mechanics one of the oldest and largest subjects in science, engineering and technology. It is also widely known as Newtonian mechanics.
The term classical mechanics was coined in the early 20th century to describe the system of physics begun by Isaac Newton and many contemporary 17th century natural philosophers, building upon the earlier astronomical theories of Johannes Kepler, which in turn were based on the precise observations of Tycho Brahe and the studies of terrestrial projectile motion of Galileo. History[edit] Description of the theory[edit] Similarly, Dynamic Periodic Table - Compound - Zn. BirdCam, Round Two. In the October 2013 issue, I described the hardware and software I used to create my "BirdTopia Monitoring Station", more commonly called BirdCam. If you've been visiting BirdCam recently, which a surprising number of folks have been doing, you'll notice quite a few changes (Figure 1). In this article, I describe the upgrades, the changes and some of the challenges along the way.
If you like fun projects like these involving Linux, please read on and join in my birdy obsession! Figure 1. BirdCam has changed a lot. Slicing and Dicing One of the first changes I wanted to make to BirdCam was to zoom in a bit on the feeders. Convert /dev/shm/original.jpg -crop 640x360+1800+1425 \ /dev/shm/birdbath.jpg convert /dev/shm/original.jpg -crop 1920x1080+220+130 \ /dev/shm/birdbath.jpg -gravity southeast -composite \ /dev/shm/final.jpg Figure 2. In the code snippet above, I crop out the small birdbath photo from the original camera photo and save it as birdbath.jpg. Time and Temp The WindowCam. BirdCam, Round Two. SciPY for Scientists. In my last article, I looked at NumPY and some of its uses in numerical simulations. Although NumPY does provide some really robust building blocks, it is a bit lacking in more sophisticated tools. SciPY is one of the many Python modules that build on NumPY's.
In fact, SciPY has become sort of the de facto science package in Python programming. If you have a scientific problem you are trying to solve, you could do worse than starting with SciPY. Not only are there more advanced functions and objects available to do linear algebra, but there also are functions and objects to handle calculus, interpolation, signal processing and Fast Fourier Transforms, among others.
So many functions are available, they actually are grouped together into sub-packages. To start, you need to import the main scipy module. Import scipy This imports the common set of functions and objects used in SciPY. From scipy import signal The simplest package in SciPY probably is the constants sub-package. Hack and / - Wiimote Control. If you think about it, there are almost as many ways to interface with your computer as there are Debian-based distributions—and that's a lot. Besides the trusty keyboard and optical mouse, there are trackpoint mice, touchpads, touchscreens, twiddlers, joysticks, presentation remotes and even devices that measure your brain waves.
Although I mostly stick with my tried-and-true keyboard and trackpoint mouse (fingers on home row, thank you), when I started hearing about all the interesting things people were doing with the Wiimote (the main controller from the Nintendo Wii), I knew I had to give it a try. Now traditionally, connecting a brand-new device to a Linux machine was an investment in Internet research, kernel module hacking, prayer and obscure programming skills I haven't used since college. I figured the mere fact that this was a Bluetooth device meant I was going to have to spend some quality time with hcidump.
First, your kernel needs the uinput module available and loaded. Fun with E-Ink, X and Gumstix. I'm excited by E-paper and the promise it holds. You've probably already heard about E-Ink's E-Paper Display (EPD) and seen it in recent E-book reader products. The E-Ink display media needs no power to hold an image, and it reflects light just like real paper. I've even seen recent products that make use of the physical flexibility of the E-Ink film in order to create “rollable” displays. But yes, this technology still has a few constraints. Current EPD displays are grayscale only and have measurable display latencies.
However, I'm convinced that these limitations will disappear over time, as has happened with many other disruptive technologies. E-paper devices have been on the market since around 2006 or so. The AM200 kit serves to provide proof of concept for E-Ink. First, let's do a quick review of the hardware infrastructure we're using to better understand the software we need to add. Now, let's dig in to the software side of things. Okay, now we can do some real work. Connected. Build a MythTV Box without Breaking the Bank. At my wedding, I received an important piece of advice from a couple whose wedding we had attended a couple years earlier: get a second TV. The idea is that while she's watching America's Next Top Model, I can watch hockey or mud wrestling or something. However, a much better solution to that age-old problem (and many others) is to set up a DVR system using Isaac Richards' open-source MythTV software.
That way, we can watch whatever shows we want at any time. This article shows how to build a MythTV box on a budget and how to avoid some common pitfalls. The following is the hardware you'll need: A computer: the first step is to get your hands on an old computer. I like Ubuntu and use it on my other computers as well, so I decided to install Mythbuntu—a MythTV-centered distribution based on Ubuntu. A word on filesystems: I used the ext3 filesystem in the initial install, but used XFS (which is better at deleting large files) on an external drive that I bought later. How does it work.