During the last decades, the concrete industry has been widely developing in many ways such as the methods of pouring concrete in order to achieve high quality concrete and low cost. Some new concretes have been produced which is completely defer from the conventional concrete in the method of mixing, pouring and no need for the normal compaction methods that require more labors, tools and cost more. This paper presents two special types of concrete; Two-Stage Concrete and Rock Filled Concrete and presents the advantages and special requirement ....etc

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Underwater acoustic communication is a technique of sending and receiving messages below water. There are several ways of employing such communication but the most common is by using hydrophones. Underwater communication is difficult due to factors such as multi-path propagation, time variations of the channel, small available bandwidth and strong signal attenuation, especially over long ranges. Compared to terrestrial communication, underwater communication has low data rates because it uses acoustic waves instead of electromagnetic waves.

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To get full information or details of advantages and disadvantages of underwater concreting please have a look on the pages

https://scribddoc/25431609/Under-Water-Concreting-BEC201

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please tell us the disadvantages of magneto rheological suspension or please tell us if any modification can be made to improve its effeincy ....etc

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hydraulic intensifier is a hydraulic machine to transform hydraulic energy at low pressure in a volume reduced to a higher pressure

Such a machine can be built by mechanically linking the two pistons, each working in a cylinder separated with a different diameter. As the pistons are mechanically connected, their strength and their stroke length are the same. If the diameters are different, the hydraulic pressure in each cylinder varies in the same ratio as their areas: the small piston giving birth at a pressure more high. When the pressure ....etc

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paper in iee format of underwater concreting pdf

Abstract

Acoustic emission testing technique is a dynamic testing technology. In this paper, the relationship between the cumulative energy of acoustic emission and lower cycle reversal loads is studied based on results of the experiments on underwater concrete columns, and waveform acoustic emission signal of different destruction states is picked up. Spectrum analysis is carried out, the results of which are compared with those of parametric analysis. The comparison shows that the waveform ac ....etc

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i need underwater concreting their methods, thier applications and significances , their conclusions ....etc

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