Walls That Can Be Tuned

In this era of telecommunications when most systems are being made wireless, the need for security has increased tremendously because various signals need to be protected and isolated from each other. Meeting both these requirements simultaneously can present a host of challenges. Currently, mobile communication and Wireless Internet Local Area Network (WLAN) systems are being designed on the basis of a detailed analysis of Radio Frequency (RF) coverage and capacity requirements. Security and privacy issues can be addressed through good design but “eavesdropping” continues to be a real vulnerability. A revolutionary technology, called Frequency Selective Surface (FSS), is increasingly being proposed and used as an answer to the deployment of secure wireless systems for indoor environments, taking advantage of innovative techniques in building design and the use of attenuating material. Towards the end of the eighteenth century, the American physicist D. Rittenhouse discovered that some colours of a light spectrum

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The Internet – Now That's Entertainment

The Internet is now a source of everything from pure entertainment to up to the minute news for the private citizen, but it has not always been that way. In fact, in the early days of the Internet (before it even claimed that name), it was strictly limited in its use and no one would have dared suggest it to be used for any frivolous. The Internet was originally conceived of in the early 1960's as a way to enable multiple computers to access information for research and development purposes in the scientific and military communities. By 1970, several major universities had super computers sharing information between research groups and libraries as well as changing an early form of email. The increase in information necessitated a way of indexing and organizing the information that eventually led to simpler codes, hypertext and ease of use in the 1980's. Initially, the government

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