CAVITY WALLS
INTRODUCTION
The term cavity wall is applied to a type of masonry wall construction in which a continuous air space or cavity is provided inside the wall.
A cavity wall therefore is actually two walls separated by an air space, but joined by means of metal ties for structural strength. They are extensively used in European countries, particularly Great Britain, where they have been developed as a means of obtaining protection from penetration of rain through masonry walls.
In recent years in North Ameri ....etc

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Cavity magnetron


The cavity magnetron is a high-powered vacuum tube that generates
microwaves using the interaction of a stream of electrons with a
magnetic field. The 'resonant' cavity magnetron variant of the earlier
magnetron tube was invented by John Randall and Harry Boot in
1940. The high power of pulses from the cavity magnetron made
centimeter-band radar practical. Shorter wavelength radars allowed
detection of smaller objects. The compact cavity magnetron tube
drastical ....etc

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The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field while moving past a series of open metal cavities (cavity resonators). Bunches of electrons passing by the openings to the cavities excite radio wave oscillations in the cavity, much as a guitar's strings excite sound in its sound box. The frequency of the microwaves produced, the resonant frequency, is determined by the cavities' physical dimensions. Unlike other microwave tubes, such as the klystron ....etc

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hi
you can read more about 'wireless power transmission' from the following thread.

http://seminarsprojects.net/Thread-wireless-power-transmission-full-report

You can use the following threads too for more details.

http://seminarsprojects.in/attachment.php?aid=3001
http://seminarsprojects.in/attachment.php?aid=3463
http://seminarsprojects.in/attachment.php?aid=3160 ....etc

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thank you i did not get this material on any other site. ....etc

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two cavity klystron amplifier operation ppt

Abstract

A klystron uses special cavities which modulate the electric field around the axis the tube. In the middle of these cavities, there is a grid allowing the electrons to pass. The first cavity together with the first coupling device is called a buncher , while the second cavity with its coupling device is called a catcher .The direction of the field changes with the frequency of the buncher cavity. These changes alternately accelerate and decelerate the electrons of the beam passing thr ....etc

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The vertical-cavity surface-emitting laser (VCSEL) is a type of semiconductor laser diode with laser beam emission perpendicular from the top surface, contrary to conventional edge-emitting semiconductor lasers (also in-plane lasers) which emit from surfaces formed by cleaving the individual chip out of a wafer.There are several advantages to producing VCSELs when compared with the production process of edge-emitting lasers. Edge-emitters cannot be tested until the end of the production process. If the edge-emitter does not work, whether due to ....etc

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construction working principle of two cavity klystron

A klystron is a specialized linear-beam vacuum tube, invented in 1937 by American electrical engineers Russell and Sigurd Varian, which is used as an amplifier for high radio frequencies, from UHF up into the microwave range. Low-power klystrons are used as oscillators in terrestrial microwave relay communications links, while high-power klystrons are used as output tubes in UHF television transmitters, satellite communication, and radar transmitters, and to generate the drive power for mod ....etc

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I want ppt on klystron and its future scope . Plz send me ppt . It will b vry helpful for me . Thank you. ....etc

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i want the details of two cavity klystron.. please reply as soon as possible.. ....etc

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