Benthic Metabolism and Standing Stock in the Central and Northern Deep Red Sea     

H. Thiel    O. Pfannkuche    R. Theeg  G. Schriever 《Marine Ecology》1987,8(1):1-20

Abstract. Benthic metabolism and standing stocks were investigated in the deep Red Sea between 21^o and 27^oN, Activity was assessed by the determination of respiration rates with a shipboard method and by calculating oxygen consumption from the activity in the electron transport system. We attempted to compare results from different latitudes within the warm Red Sea and with data from cold Atlantic environments. Our investigations were part of an environmental risk assessment to evaluate future mining of metalliferous sediments from the Atlantis II Deep.  相似文献   

Acoustic measurements of zooplankton distributions in the sea     

Pieper  R. E.; Holliday  D. V. 《ICES Journal of Marine Science》1984,41(3):226-238

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The dependence of recruitment on parent stock derived from the average recruitment     

Cushing  D. H. 《ICES Journal of Marine Science》1984,41(3):276-279

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Design and performance analysis of a Digital Acoustic Telemetry System for the short range underwater channel   总被引：1，自引：0，他引：1  

Catipovic  J. Baggeroer  A. Von Der Heydt  K. Koelsch  D. 《Oceanic Engineering, IEEE Journal of》1984,9(4):242-252

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Optimum design of a servo-controlled breathing regulator for underwater divers     

A. Baz  S. Kassem  H. Helal  S. Mikhail 《Ocean Engineering》1984,11(1):87-110

This article deals with the analysis, synthesis and performance evaluation of the flow and dynamic characteristics of the new class of servo-controlled breathing regulators for underwater divers.Emphasis on such a class of regulators has been stimulated by their tremendous potential in extending the dive depth and duration because they reduce the diver breathing effort to a great extent. This would eliminate the unnecessary exhaustion of the diver under such extreme diving conditions and accordingly improve his work efficiency underwater.The study aims at developing rational design procedures and guides that would enable the regulator designers to select the optimal design parameters of this class of regulators. Such design guides are based on the analysis of the flow and dynamic characteristics of the servo-controlled regulator as well as the basic principle of the theory of optimum control.The study presents also experimental evaluation techniques of the dynamic characteristics of this class of regulators in order to provide common quantitative means for comparison with the conventional regulator designs.The presented results emphasize the merits and the potential of the servo-controlled regulators as essential tools of supporting the life of divers underwater.  相似文献   

Fishing effort and fisheries policy     

S. Cunningham  D. Whitmarsh 《Marine Policy》1980,4(4):309-316

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A simulacrum of the Iceland cod stock     

Cushing  D. H. 《ICES Journal of Marine Science》1982,40(1):27-36

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Petroleum hydrocarbons in sediments of Southampton water estuary     

Anthony H. Knap  Peter J. LeB. Williams  Elizabeth Lysiak 《Marine environmental research》1982,7(4):235-249

The sediments of Southampton Water were analysed for petroleum hydrocarbons to determine the fate of petrochemical refinery waste in the estuary. Much of the petroleum hydrocarbons appears to be removed by adsorption onto estuarine sediments close to source. Surface sediment concentrations range from 3·1mg/g dry weight near a refinery to 0·5 mg/g dry weight at locations distant from the refinery.The absence of any change with depth in total hydrocarbon concentrations from some sediment cores and the presence of distinct ‘oil’ horizons in others suggests that mixing of sediments in the area is very random. Sedimentation rates in areas where a distinct oil horizon was observed ranged from 1 to 3cm a year.  相似文献   

Optimization of an ocean thermal energy conversion system     

H. Searl Dunn 《Ocean Engineering》1977,4(1):23-39

The optimum performance of a simple Rankine cycle ocean thermal energy conversion plant is investigated analytically. It is shown that the ratio of maximum net power output to heat exchanger surface area varies as H(Δt − t₀)² where H describes the overall heat transfer properties of the evaporator and condenser, Δt is the temperature difference between the warm and cold sea water supplies, and t₀ is a parameter depending primarily upon the pressure drops across the warm and cold sea water pumping systems. The model is relatively insensitive to the choice of working fluid, although ammonia is used as the illustrative example.  相似文献   

The role of damped equatorial waves in the oceanic response to winds     

Toshio Yamagata  S. G. H. Philander 《Journal of Oceanography》1985,41(5):345-357

In inviscid shallow water models currents generated by spatially uniform winds are transient and are eliminated by Rossby and equatorial Kelvin waves excited at the eastern and western coasts, respectively. The inclusion of mixing processes can lead to an entirely different steady state in which currents are present. It is shown that the mixing of heat affects the steady state more than does the mixing of momentum because the waves that are important in the oceanic adjustment are divergent.  相似文献