This study was conducted to test the hypothesis that personnel assigned to submarine duty would display less physical fitness as compared to shore-based personnel. A message was submitted to all naval activities at a Naval Submarine Base requesting individual test scores from the annual Health and Physical Readiness (H&PR) Test. The results from the statistical analysis showed that the majority...

(U) In the context of an information-based society the ability to reliably retrieve, transfer and process large quantities of data in a timely fashion becomes a critical technology issue. In the context of integrating submarine offboard sensors and physically supporting data connectivity with terrestrial networks: reliable, high bandwidth communications ranks as an extremely difficult technical...

Recent advances in submarine rescue systems have allowed a transfer under pressure of crew members being rescued from a disabled submarine. The choice of a safe decompression procedure for pressurised rescuees has been previously discussed, but no schedule has been validated when the internal submarine pressure is significantly increased i.e. exceeding 2.8 bar absolute pressure. This study test...

The rate of mass loss from the Greenland ice sheet has increased over the past decade due, in large part, to changes in marine-terminating outlet glacier dynamics. These changes are attributed to increased submarine melt rates of floating ice tongues and submerged calving faces resulting from increased coastal ocean heat transport. We use remotely sensed data to calculate submarine melt rates f...

Submarine ground water discharge can influence significantly the near-shore transport and flux of chemicals into the oceans. Quantification of the sources and rates of such discharge requires a ground water seepage meter that provides continuous measurements at high resolution over an extended period of time. An ultrasonic flowmeter has been adapted for such measurements in the submarine enviro...

Submarine canyons have been studied to a very limited extent in spite of their important biological roles as hotspots of secondary production and organic matter conduits between the shelf and the deep sea. The heterogeneity and rugged terrain of submarine canyons makes them difficult to sample using traditional means such as trawling, however there has be a great deal of success in using ROVs t...

The present sought to draw a comparison between Model Predictive Control performance and two other controllers named Simple PI and Selective PI in controlling large-scale natural gas transport networks. A nonlinear dynamic model of representative gas pipeline was derived from pipeline governing rules and simulated in SIMULINK® environment of MATLAB®. Control schemes were designed to provide a s...

The Siberian Laptev Sea shelf contains submarine permafrost, which was formed by flooding of terrestrial permafrost with ocean water during the Holocene sea level rise. This flooding resulted in a warming of the permafrost to temperatures close below 0 degrees C. The impact of these environmental changes on methanogenic communities and carbon dynamics in the permafrost was studied in a submarin...

When submarine cable line fails or other lines need load transfer, it often suffers from emergency ampacity that exceeds the steady-state ampacity. The layout environment of is always complex and changeable, overload capacity in different environments also different. Therefore, necessary to analyze cable. In this paper, a coupled multi-physical field model by finite element method established f...