Pile driving at large construction sites produces formidable noise. Marine pile driving similarly can produce high sound pressures underwater”but these can be lethal to fish and can harass marine mammals, including those protected by federal law. This problem has contributed to costly construction delays on major bridge projects. To protect marine life, engineers have designed air bubble curtains to reduce underwater sounds. Air provides an effective barrier to sound propagating through water, because of the difference in density betwee ....etc

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SYNOPSIS
Autonomous underwater gliders, and in particular autonomous underwater gliders, represent a rapidly maturing technology with a large cost-saving potential over current ocean sampling technologies for sustained(month at a time) real-time measurements.
This report gives us an overview of the main building blocks of an underwater glider system for propulsion, control, communication and sensing. A typical glider operation, consisting of deployment, planning, monitoring and recovery will be descri ....etc

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Underwater welding refers to a number of distinct welding processes that are performed underwater.

The two main categories of underwater welding techniques are wet underwater welding and dry underwater welding, or hyperbaric welding.

In wet underwater welding, a variation of shielded metal arc welding is commonly used, employing a waterproof electrode. Other processes that are used include flux-cored arc welding and friction welding. In each of these cases, the welding power supply is connected to the welding equipment through cables and ....etc

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Introduction to underwater optical communication
¢ The future tactical ocean environment will be increasingly complicated.
¢ In addition to traditional communication links there will be a proliferation of unmanned vehicles in space, in the air, on the surface, and underwater
¢ Under water, where radio waves do not propagate, acoustic methods will continue to be used.


Free Space Optics Concepts
Free-space optics (FSO) is a line-of-sight (LOS) page link that utilizes the use of lasers or lig ....etc

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I want more information on underwater welding.. Full report on underwater welding..... ....etc

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The use of cognitive radio techniques in wireless mobile networks can lead to significant capacity increase. Cognitive radios sense the radio spectrum environment and to switch dynamically to available frequency ranges. a framework for applying cognitive radio technology to mobile WiMAX is described in this article. In this framework , the base stations are
equipped with sensitive detectors which dynamically assign channels to
subscriber station depending upon the on spectrum availability. The frequency reuse is increased by Power control. ....etc

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Abstract

The use of sensor networks in aquatic environments has been quite limited, partially due to the harsh underwater environments and associated high system costs. Nevertheless, cost-effective and resource-efficient Underwater Wireless Sensor Networks (UWSNs) will bring significant benefits to numerous aquatic applications. The unique properties of underwater environments raise many new challenges in building an efficient UWSN. We will discuss several architectural challenges and possible research topics in this paper.

Presente ....etc

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RECONSTRUCTION OF UNDERWATER IMAGE BY BISPECTRUM

Reconstruction of underwater object from a sequence of images distorted by moving water waves is a challenging task. A new approach is presented in this project. We make use of the bi spectrum technique to analyze the raw image sequences and recover the phase information of the true object. We test our approach on both simulated and real-world data, separately. Results show that the algorithm is very promising. Such technique has wide applications to areas such as ocean study and submarine ob ....etc

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Abstract
While wireless communication technology today has become part of our daily life, the idea of wireless undersea communications may still seem far-fetched. However, research has been active for over a decade on designing the methods for wireless information transmission underwater. Human knowledge and understanding of the worldâ„¢s oceans, which constitute the major part of our planet, rests on our ability to collect information from remote undersea locations.
The major discoveries of the pa ....etc

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INTRODUCTION
The ocean covers some 70% of our planet and is a rich fund of information on global health, climate change, and resource degradation. Studying marine ecosystems, ensuring port security, and monitoring oil pipelines and leaks of hazardous materials in transit are some of the specific reasons for profiling the concentration and distribution of substances in the ocean.
Considerable research has been conducted to develop and assess methods of sensing the ocean on spatial and temporal scales ranging fr ....etc

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