Commercial applications usually rely on precompiled parameterized procedures to interact with a database. Unfortunately, executing a procedure with a set of parameters different from those used at compilation time may be arbitrarily suboptimal. Parametric query optimization (PQO) attempts to solve this problem by exhaustively determining the optimal plans at each point of the parameter space at compile time. However, PQO is likely not cost-effective if the query is executed infrequently or if it is executed with values only within a subset of t ....etc

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INTRODUCTION:
Since the late 1980s, parametric search, the optimization technique developed by Megiddo in the late 1970s and early 1980s, has become an important tool for solving many geometric optimization queries efficiently. The main principle of parametric search is to compute a value that optimizes an objective function f with the use of an algorithm As that solves the corresponding decision problem. ....etc

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what is an amplifier used in a medical device?
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Although the use of parametric amplifiers for high frequency, low noise amplification is relatively recent, the principles themselves are not at all new. They were first propounded by Lord Reyleigh in the 1880s for Mechanical Systems and by R. Hartley in 1930s for electrical applications. The need for extremely low noise amplification , as in radio telescopes, space probe tracking and communications, and tropospheric scatter receivers, spurred the design of useful parametric amplifiers in the late 1950s. The low ....etc

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The magnetic amplifier (colloquially known as the mag amp) is an electromagnetic device for amplifying electrical signals. The magnetic amplifier was invented early in the 20th century, and was used as an alternative to vacuum tube amplifiers where robustness and high current capacity were required. World War II Germany perfected this type of amplifier, and it was used for instance in the V-2 rocket. The magnetic amplifier has now been largely superseded by the transistor-based amplifier, except in a few safety critical, high reliability or ....etc

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MICROWAVE
Electromagnetic wave
Frequency ranging from 0.3GHz to 300GHz
Wavelength is as long as one meter to as short as one millimeter .
It can go through ionosphere
RADAR , Satellite ,Mobile communication

Principle Of Amplification
The power of the microwave is increased by transferring the energy of the excited electrons or atoms to the microwave by different methods
Types of Microwave Amplifiers
Klystron
Magnetron
Travelling wave tubes
Crossed Field Amplifiers
Maser
Klystrons
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please send me magnetic amplifiere ppt and documentation to [email protected] ....etc

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Class D amplifiers present us with a revolutionary solution, which would help us eliminate loss and distortions caused due to conversion of digital signals to analog while amplifying signals before transmitting it to speakers. This inchoate piece of knowledge could prove to detrimental in improving and redefining essence of sound and take it to a different realm.

This type of amplifiers do not require the use of D-A conversion and hence reduce the costs incurred for developing state of art output technology. The digital output from sources s ....etc

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feedback amplifiers pdf and ppt i want it completely hand written and alsoo very shor and descriptive ....etc

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A magnetic amplifier is a device which controls the power delivered from an a.c. source by employing a controllable non linear reactive elements or circuit generally interposed in series with the load. The power required to control the reactive element or circuit is made for less than the amount of power controlled; and hence power amplification is achieved. The non-linear reactive element is a saturable reactor. When used in a combination with a set of high-grade rectifiers, it exhibits power amplification properties in the sense that small ch ....etc

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