Updated: 5/16/2006; 11:10:19 AM.

Ken Novak's Weblog
Purpose of this blog: to retain annotated bookmarks for my future reference, and to offer others my filter technology and other news. Note that this blog is categorized. Use the category links to find items that match your interests.
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daily link  Monday, October 20, 2003


The End of Spectrum: "There are two basic problems with the rules governing the radio spectrum: there is no such thing as spectrum, and we don't need any rules." 

Nice technical summary, listing spectrum sharing methods other than frequency division: "Wireless technology has come a long way since Marconi's day. For example, many systems now use spread-spectrum as an alternative to frequency division. WiFi and CDMA cellular networks are two examples. In both cases, devices share the "same" frequencies, using computational intelligence to distinguish one signal from another. The ultimate form of spread-spectrum is ultra-wideband (UWB). UWB systems can transmit at extremely low power, so low that they appear invisible to licensed systems operating in the same bands. ..  Other novel forms of wireless sharing include angle-of-arrival (for example, distinguishing a satellite transmission coming from overhead and a terrestrial wireless signal moving horizontally); mesh networking (relaying signals from other users); and cognitive radio (sensing the environment to find temporarily open "holes," and moving out of the way once another signal appears)."

  10:25:23 PM  permalink  

FisheyeMenuDemo: Flash demo of a better way to do long scrolling lists.  9:59:04 PM  permalink  

Water sparks new power source: "A new way to generate electricity from water which could be used to power small electronic devices in the future has been developed by Canadian scientists. .. The research by Professor Kostiuk and colleague Professor Daniel Kwok is published by an Institute of Physics journal.  It is said to be the first new method of generating electricity in over 150 years.  The work is all to do with charge separation, and what happens to ions in liquids when they come into contact with a non-conducting solid."  Bottom line: pressurized water can generate power when passed through a device with hundreds of thousands of microchannels in a block of glass .  12:08:32 PM  permalink  

 

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Last update: 5/16/2006; 11:10:19 AM.