Local member response in offshore structures under earthquake excitations     

Stavros A. Anagnostopoulos  Arthur R. Culbertson 《地震工程与结构动力学》1982,10(3):349-358

It is pointed out that local vibrations of certain members in earthquake excited offshore structures can induce substantial stresses that may often dominate the design of these members. Such vibrations are not accounted for in dynamic analyses of structural models with masses lumped at the joints. A practical, easy to implement solution to this problem is recommended and results from an actual structure, subjected to a three-component real earthquake, are presented demonstrating the importance of local inertia effects.  相似文献   

Handbook of exploration geochemistry. volume 1: analytical methods in geochemical prospecting: W. K. Fletcher,Elsevier, 1981, 256 pp, $59.50     

Arthur W. Rose 《Geochimica et cosmochimica acta》1982,46(5):834-835

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ORGANIC COMPOUNDS AND GROUND-WATER POLLUTION     

Wayne A. Pettyjohn  Arthur W. Hounslow 《Ground Water Monitoring & Remediation》1983,3(4):41-47

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DDT,PCB and benzo(a)pyrene levels in white croaker (Genyonemus lineatus) from southern California     

Richard W Gossett  Harold W Puffer  Robert H Arthur  David R Young 《Marine pollution bulletin》1983,14(2):60-65

In 1978 the California Department of Fish and Game carried out a major, independent sportfishing survey in southern California. The results of that survey indicated that approximately one million angler-trip hours per year were spent fishing and that one in three fish caught was a white croaker (Genyonemus lineatus). There was no attempt by the Department of Fish and Game to determine the disposition of caught fish. We conducted a subsequent survey in 1980 which included 12 popular sportfishing sites in the Los Angeles area. Our results also indicated that one in three fish caught was a white croaker. In addition our survey showed that 82% of the sportfishermen ate the white croaker they caught and the median consumption was 14.8 g day^?1 person^?1. White croaker were then sampled by hook-and-line from 11 of the 12 survey sites plus two control sites and analysed for PCB, DDT and BaP. Median PCB levels ranged from 0.014 to 0.41 mg wet kg^?1; median DDT from 0.059 to 7.5 mg wet kg^?1 and BaP was below detectable limits of 1 ng for all sites.  相似文献   

Strike slip faulting inferred from offsetting of drainages: Lower Narmada basin, western India     

Rachna Raj 《Journal of Earth System Science》2007,116(5):413-421

The detailed analysis of landforms, drainages and geology of the area between the rivers Amaravati and Karjan was carried out in order to understand the tectonic history of the lower Narmada basin. Movement along the various faults in the area was studied on the basis of the drainage offsetting. Horizontal offsetting of stream channels was found quite demonstrable along NNW-SSE trending transverse faults. Tectonic landforms including systematic deflection of stream channels and ridges, alignment of fault scarp and saddles and displacement in the basement rocks and alluvial deposits show that the area is undergoing active deformation driven by the NSF system.  相似文献   

Cryptosporidium Oocysts in Drinking Water Supply of Chennai City,Southern India     

Muthukumar Anbazhagi  Dhanraj Loganathan  Subramani Tamilselvan  Raj Jayabalou  Senthilkumar Kamatchiammal  Rakesh Kumar 《洁净——土壤、空气、水》2007,35(2):167-171

Cryptosporidium is an enteric parasitic protozoan capable of causing chronic diarrhea. One of the most common modes of transmission is through faeces‐contaminated water. This study determines the distribution of Cryptosporidium oocysts for the first time in Chennai City's drinking water supply. 199 drinking water samples were collected from ten zones of the city. In the water samples Cryptosporidium, a common pathogenic protozoan of the gastrointestinal tract, has been analyzed physico chemically as well as microbiologically for heterotrophic organisms and total coliforms (TC). The studies revealed that three zones of the city were highly contaminated with coliforms and parasitic protozoa. A statistical analysis was done to find any correlation between heterotrophic organisms, total coliforms, and oocysts. Even though a positive correlation exists between oocysts and bacteriological parameters, a regression equation shows that heterotrophic plate count (HPC) and total coliforms were only 20% responsible for the presence of oocysts. The level of Cryptosporidium oocysts isolated from the water samples may present a public health hazard although no major outbreaks have so far been reported in Chennai City. Routine surveillance of water quality throughout the city is needed to curb the pollutants.  相似文献   

Lineaments and seismicity of Kerala — a remote sensing based analysis     

K Ganesha Raj  M A Paul  V S Hegde  R Nijagunappa 《Journal of the Indian Society of Remote Sensing》2001,29(4):203-211

Seismically active lineaments of Kerala State were identified by correlating the lineaments mapped using IRS LISS-I data with the earthquake occurrences. There are 31 earthquake incidences in Kerala since 1821, out of which 22 are falling on/close to 9 major lineaments/faults (length more than 20 km) indicating the possible correlation between lineaments/faults and earthquakes. It was observed that the earthquake occurrences are mostly associated with the NNW-SSE to NW-SE trending lineaments (6 out of 9 lineaments), which are considered to be formed sympathetic to the West Coast Fault. Hence, there is a need to monitor these seismically active lineaments using advanced techniques such as GPS, SAR Interferometry etc. for better understanding of the influence of these lineaments on the seismic activities of Kerala.  相似文献   

Holocene History of the Bering Sea Bowhead Whale (Balaena mysticetus) in Its Beaufort Sea Summer Grounds off Southwestern Victoria Island, Western Canadian Arctic     

Arthur S. Dyke  James M. Savelle 《Quaternary Research》2001,55(3):371

The fossil remains of 43 bowhead whales were mapped on the raised beaches of western Wollaston Peninsula, Victoria Island, Canadian Arctic, near the historic summer range limit of the Bering Sea stock in the Beaufort Sea. The elevations and radiocarbon ages of the remains demonstrate that the bowhead ranged commonly into the region following the submergence of Bering Strait at ca. 10,000 ¹⁴C yr B.P. until ca. 8500 ¹⁴C yr B.P. During the same interval, bowheads ranged widely from the Beaufort Sea to Baffin Bay. Subsequently, no whales reached Wollaston Peninsula until ca. 1500 ¹⁴C yr B.P. Late Holocene populations evidently were small, or occupations were brief, in comparison to those of the early Holocene. Although the late Holocene recurrence may relate to the expansion of pioneering Thule whalers eastward from Alaska, there are few Thule sites and limited evidence of Thule whaling in the area surveyed to support this suggestion.  相似文献   

Reply to Russell Graham about Mustela macrodon     

Jim I Mead  Arthur E Spiess 《Quaternary Research》2001,56(3):422

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Statistische Bearbeitung einer einjährigen Grobaerosol-Messreihe     

Privatdozent Dr. Dr. Ernst Effenberger  Prof. Dr. Arthur Linder 《Pure and Applied Geophysics》1957,36(1):86-93

Zusammenfassung Die Ergebnisse von Untersuchungen über das Grobaerosol (Partikelgröße über 0.5 ) in einer Großstadt (Hamburg), wurden mit Hilfe modernster statistischer Verfahren eingehend bearbeitet. Eine ursprünglich durchgeführte grobe Bearbeitung, wie sie heute noch von den meisten Meteorologen vorgenommen wird, ergab praktisch nur eine Abhängigkeit von den Jahreszeiten (Heizperiode) und von den Inversionslagen.Mit Hilfe moderner statistischer Methoden war es u. a. möglich, statistisch gesicherte Abhängigkeiten der Partikelzahlen und Partikelgrößen von der Windrichtung, der Partikelzahlen von der Windstärke und der Partikelzahlen von den Luftkörpern, aufzudecken. Auch ein statistisch gesicherter Zusammenhang zwischen der Sichtweite und der Partikelzahl des Grobaerosols konnte festgestellt werden.Diese Untersuchungen zeigen deutlich die Vorteile und die Notwendigkeit der Bearbeitung von Meßreihen mit den neuen Verfahren der mathematischen Statistik.  相似文献