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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Non Conventional Energy System




Throughout the history of human kind, energy has been an important factor is development. The availability and exploitation of new energy sources has made possible major economic and social changes. Modern societies requiring a large amount of energy used in agricultural, industrial and transport uses. Energy sources can be classified as commercial energy sources and non-commercial energy sources. Commercial sources includes fossil fuels (coal, oil, Naturalgas) while non-commercial energy sources includes ....etc

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There is also an amazing, 220,000 square foot Convention Center on the premises. These companies also follow up through their customer service making sure you get precisely what you needed. A personalized custom label or iron on .
Boston, Mass.,- Kip Hollister, Founder CEO of Boston-based staffing firm Hollister, spoke at the Massachusetts Conference for Women on December 10th. The conference, strongly geared towards female job-seekers and businesswomen, drew in over 5,000 attendees. In addition to a broad variety of panelists, the conferenc ....etc

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Concrete is an indispensable construction material of modern age. The properties of concrete are greatly dependant on the constituents, workmanship, water-cement ratio, compaction, curing etc. Direct assessment of the strength of concrete is not possible because direct tests induces destructive stresses and causes failure of the structure. So the concrete strength is tested using standard specimens made with the same mix as that of the structure. But the test specimens can vary from the actual structure in properties due to difference in compac ....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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Introduction
Throughout the history of human kind, energy has been an important factor is development. The availability and exploitation of new energy sources has made possible major economic and social changes. Modern societies requiring a large amount of energy used in agricultural, industrial and transport uses. Energy sources can be classified as commercial energy sources and non-commercial energy sources. Commercial sources includes fossil fuels (coal, oil, Naturalgas) while non-commercial energy sources includes wood, animal waste agricu ....etc

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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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In this paper, the implementation of a shunt active power filter with a small series reactor for a three-phase system is presented. The system consists of multiple non-linear loads, which are a combination of harmonic current sources and harmonic voltage sources, with significant unbalanced components.The filter consists of a three-phase current-controlled voltage source inverter (CC-VSI) with a filter inductance at the ac output and a dc-bus capacitor. The CC-VSI is operated to directly control the ac grid current to be sinuso ....etc

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Concrete is an indispensable construction material of modern age. The properties of concrete are greatly dependant on the constituents, workmanship, water-cement ratio, compaction, curing etc. Direct assessment of the strength of concrete is not possible because direct tests induces destructive stresses and causes failure of the structure. So the concrete strength is tested using standard specimens made with the same mix as that of the structure. But the test specimens can vary from the actual structure in properties due to difference in compac ....etc

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Non-rocket spacelaunch is the idea of reaching outer space mainly without the use of rockets, which today is the only method in use. Transportation to orbit is often the limiting factor in space endeavours. Present-day launch costs are very high ” $3,000 to $25,000 per kilogram from Earth to Low Earth Orbit (LEO). To settle space, e.g. space exploration and space colonization, much cheaper launch methods are required, as well as a way to avoid serious damage to the atmosphere from the thousands, perhaps millions, of launches required. Man ....etc

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