Saturday, May 30, 2009
Cordless TrackMan® Optical
"I assume you have reviewed this Trackman before you buy it. Five years ago, when I bought the TrackMan, there were not many reviews as today.
The features of Trackman are great compare to other mouses in the market. I found every fingers lie on top of each buttons of Trackman. I love the back and forward buttoms which make surfing the web more user friendly.
The connetivity is the problem. Once in awhile, the Trackman lose it signal with the wireless base receiver. Why is that happen? I found if I have an object which stands between the TrackMan and its base, the connection is lose. Or if I placed the base under the desk (on top of CPU), the connetion is lose. The best is to place the base behind the monitor; therefore, it connects with the TrackMan continously."
Wireless Rechargeable Optical Mouse-5 Buttons
Tired of being constrained by the wire on your mouse? Check out the PCiDepot Wireless Optical Mouse (5 Buttons, 3 buttons programmable) with Charger. This Wireless Mouse allows you to wirelessly navigate a mouse without wire up to 2 meters from your notebook or desktop computer. The mouse also features an optical sensor and digital signal processor to read and follow your mouse moves. Work efficiently and enjoy precise, accurate and quick response with the 800 DPI optical sensor.
It comes with a USB receiver key that will allow true plug and play connection with the notebook or desktop USB port.Also provided is a desktop charger for the integrated rechargeable batteries in the mouse.Simply place the mouse in the charger overnight for a full charge and you're ready to go !
Designed with an eye-catching metallic silver-on-black paint job, it's dramatic
If you're still dealing with messy cords and dirty track balls, this mouse will seem nothing short of amazing. If you're already working with a wireless optical mouse, you may want to upgrade just for the additional controls and convenient recharging station.
The Delux Mouse is a 800dpi desktop champion. The reliable and comfortable mouse has plug and play capability and sports a PS/2 plug. It's the friendly accessory that gives users smooth, accurate pointing at up to 800 dpi.The 3-button design offers complete control of viewing documents and web pages while offering a cool look that will fit any decor ! Built for right or left hand use. Ergonomically designed for maximum comfort.
Price: US $ 6.29
New York City - Amazing Technology, Optical Device Offers View Of London
New York City - Thanks to an artist's tunnel vision, a New Yorker can stand in Brooklyn, wave to someone in London - and see the Brit waving back.
The jolly good show is made possible by a huge optical device called a "telectroscope" created by a sculptor who has also invented a tale about its origin, claiming it was made possible by a long-lost secret tunnel.
The gizmo was placed at the Fulton Ferry Landing by the Brooklyn Bridge yesterday - and an identical one was set up across the pond on London's South Bank by the Tower Bridge.
Step up to the person-size lens of the brass-and-wood device and you see a life-size view in real time of whoever is gazing through the lens on the other side.
The work by London artist Paul St. George looks like a giant telescope burrowing into the ground. Publicists for the project would say only that the scope works by using fiberoptic communication.
Optical Device Cancels Starlight So Astronomers Can See Distant Planets
"Some people say that I study darkness, not optics," jokes Grover Swartzlander.
But it's a kind of darkness that will allow astronomers to see the light.
Swartzlander, an associate professor in The University of Arizona College of Optical Sciences, is developing devices that block out dazzling starlight, allowing astronomers to study planets in nearby solar systems.
The devices also may prove valuable to optical microscopy and be used to protect camera and imaging systems from glare.
The core of this technology is an "optical vortex mask" -- a thin, tiny, transparent glass chip that is etched with a series of steps in a pattern similar to a spiral staircase.
When light hits the mask dead on, it slows down more in the thicker layers than in thinner ones. Eventually, the light is split and phase shifted so some waves are 180 degrees out of phase with others. The light spins through the mask like wind in a hurricane. When it reaches the "eye" of this optical twister, light waves that are 180 degrees out of phase cancel one another, leaving a totally dark central core.
Swartzlander says this is like light following the threads of a bolt. The pitch of the optical "bolt" -- the distance between two adjacent threads -- is critical. "We're creating something special where the pitch should correspond to a change in the phase of one wavelength of light," he explained. "What we want is a mask that essentially cuts this plane, or sheet, of incoming light and curls it up into a continuous helical beam."
"What we've found recently is knock-your-socks-off amazing from a theoretical point of view," he added.
"Mathematically, it's beautiful."
Optical vortices are not a new idea, Swartzlander noted. But it wasn't until the mid 1990s that scientists were able to study the physics behind it. That's when advances in computer-generated holograms and high-precision lithography made such research possible.