Discussion on the article “Numerical modeling of flow characteristics in a rotating annular flume” by Yang, Z., Baptista, A., Darland, J. [Dyn. Atmos. Oceans 31 (2000) 271–294]     

Jerome P. -Y. Maa   《Dynamics of Atmospheres and Oceans》2001,33(4)

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天然地震接收函数揭示的青藏   总被引：10，自引：0，他引：10       下载免费PDF全文

钱辉  姜枚  薛光琦  宿和平  Xue Guangqi  Su Heping 《地震学报》2001,23(1):103-108

1998年 6～ 1 1月 ,中国地质科学院与法国 Joseph大学地球物理及构造研究所合作 ,在青海共和至玉树公路沿线 ,布置了40台 Minititan三分量地震仪和 1 3台 CEIS单分量地震仪 ,进行天然地震观测 .研究区位于班公—怒江断裂以北、柴达木以东、中祁连断裂以南和龙门山断裂以西的区域 .沿线穿过南祁连、东昆仑、巴颜喀拉、金沙江等 ,横穿了青藏高原东部的大部分区域(图 1 ) .此剖面是第一次穿越青藏高原东部的地震探测剖面 ,它有利于与中部已有的研究成果进行对比 ,便于探讨在印度大陆向北俯冲的过程中 ,对青藏高原东部深部特征的影响 ,特别是…  相似文献   

The influence of preform on the modes of vibrating beams     

James M. Kelly  Jerome L. Sackman  Ahmad Javid 《地震工程与结构动力学》1991,20(12):1145-1157

A theoretical analysis is presented of a vibratory system in which it is possible to eliminate an unwanted mode of vibration by using that mode as an initial deformation of the system. The analysis shows that this is possible in straight beams with end restraints in axial deformation. The mathematical problem leads to an eigenvalue problem of a type not normally encountered. In the paper examples are given for the changes in eigenfrequency and mode shape produced by the initial preformed shape of the beam for cases where the preform is proportional to a mode of the straight beam and when the preform is unrelated to any mode. The analysis shows that, while elimination of a mode in the strict sense is not achieved, the results can be interpreted for practical purposes in this way.  相似文献   

Response of fixed offshore structures in random sea     

Demosthenes C. Angelides  Jerome J. Connor 《地震工程与结构动力学》1980,8(6):503-526

An integrated model is developed for the short-term and long-term dynamic response of an offshore structure subjected to random wave excitation. A discrete linear, elastic model of the upper structure is coupled with an iterative linear quasi-three-dimensional finite element model for the pile-soil medium, and the system is subjected to stochastic storms described by mean rate of arrival, joint probability distribution of storm duration and average intensity, and a random process that describes the variations of a statistical wave height measure during each storm. Sarpkaya's 1977 experimental information is used to specify values for C_M and C_D, in Morison's equation, consistent with the flow and response characteristics. Soil (clay) degradation, due to cyclic excitation, is followed during the passage of a storm. The indicator of soil degradation is taken to be the value of the horizontal foundation stiffness and the stiffness degradation is modelled by a homogeneous Markov process.  相似文献   

Solubility equilibrium constant of α-hopeite     

Jerome O Nriagu 《Geochimica et cosmochimica acta》1973,37(11):2357-2361

The saturation curve for synthetic α-hopeite, Zn₃(PO₄)₂·4H₂O in dilute phosphoric acid solutions has been determined at 25°C as a function of pH. Interpretation of the data in terms of a model which assumes the formation of the ion-pairs ZnHPO₄⁰ and ZnH₂PO₄⁺ in these solutions resulted in the solubility product constant for α-hopeite of 10^?35.3±0.1. The data show that the formation of hopeite may influence both the availability of zinc in soils and the zinc levels in natural water systems.  相似文献   

Preliminary landfill siting and related analysis using simple modeling techniques     

Karl Gebhardt  Jerome Jankowski 《Engineering Geology》1987,23(3-4):291-306

The evaluation of existing and new landfills requires considerable consideration of environmental factors for the protection of groundwater resources. The initial evaluation of sites can be time-consuming and expensive depending on the assessment approach selected. General planning methods, such as the DRASTIC procedure, coupled with the use of analytical or numerical groundwater models can provide useful site selection tools by improving the quality and quantity of analysis. This paper presents an overview of some promising methods for landfill site evaluation and suggests alternative data sources where few data are present. Examples of some of the methods are given.  相似文献   

AUTOMATED GEOGRAPHY   总被引：5，自引：3，他引：2  

Jerome E. Dobson 《The Professional geographer》1983,35(2):135-143

Analytical methods and computer technology for spatial analysis have advanced rapidly. Geographers can now consider a general form of automated geography which integrates all of the new techniques into an analytical whole. Computer cartography, computer graphics, digital remote sensing, geographic information systems, spatial statistics, and quantitative spatial modeling can be combined eclectically with traditional manual techniques to address geographic problems that are too large and complex for manual treatment alone. Small systems are widely available to facilitate small, less complex problems. Automation can assist in all forms of geography—scientific and humanistic, nomothetic and idiographic, basic and applied—but its adoption is likely to be highest among applied scientists. The immediate challenge is to prepare for a major shift toward computer instruction and automated geography in the late 1980s. Long term effects will include improved contributions by geographers to national and international policy analyses, a greater emphasis on team-work and sharing, stronger ties with other disciplines, and a generally more viable discipline.  相似文献   

THE NEEDLES (CALIFORNIA) IRON METEORITE     

John T. Wasson  Jerome Kimberlin 《Meteoritics & planetary science》1969,4(3):233-239

The Needles fine octahedrite, which weighs 45.3 kg, was found in 1962 in the Turtle Mountains, about 50 km SSW of Needles, California. It contains 10.3% Ni, 77 ppm Ga, 93 ppm Ge and 4.8 ppm Ir, and is a member of chemical group II D. It is rather similar to the Wallapai, Arizona, meteorite, and may possibly be a transported mass from this multiple fall. The compositional evidence slightly favors the interpretation that Needles is a distinct fall.  相似文献   

Experiments with scale models of oil collectors for subsea well blowouts — Part II     

Jerome H. Milgram  Christopher J. Von Alt  James J. Burgess 《Applied Ocean Research》1983,5(3):120-128

A previous paper of the same title indicated the feasibility of the collection of oil by an open bottom collector above a blowout with a marine riser above the collector; the whole collection system being driven by gas lift from the blowout gas. That paper was based on small-scale laboratory experiments and it identified the salient dimensionless parameters governing those experiments. This paper describes laboratory experiments on a refinement of the collection system and also describes the results of intermediate scale experiments. The length scale of these experiments was about four times greater than laboratory scale and about one-fourth of full scale. Generally, the intermediate scale results are consistent with the laboratory predictions. Furthermore, two scale-dependent parameters have been identified. The effects of these have been included in an analysis of the results.  相似文献   

Experiments with scale models of oil collectors for subsea well blowouts     

James J. Burgess  Jerome H. Milgram 《Applied Ocean Research》1983,5(1):2-12

Laboratory experiments on conically shaped oil collectors beneath a marine riser are described. The collection concept involves oil, water and gas entering the collector and being driven into a separating sytem by gas-lift. A parametric study involving various collector shapes, heights above the wellhead, and gas, oil and water flow rates was carried out. The important dimensionless variables were identified and quantified with the conclusion that effective collection is possible if the collector height is sufficiently small and the ratio of water pumped to gas flow is sufficiently large. Increased collector heights can be accommodated at the expense of requiring increased water flows by use of larger diameter risers. The amount of gas required for most efficient oil collection is found to be much less than is expected to come from most blowouts when a single collector and riser system is used. This difficulty can be greatly diminished by the use of a specially designed gas-separating collector which passes most of the gas to the surface through a riser separate from the one which carries the liquids.  相似文献