Book Review: NEW APPROACHES TO SPECIATION IN THE FOSSIL RECORD. Eds. Douglas H. Erwin and Robert L. Anstey. Columbia University Press, 1995. 342 pp. £34.00 ($49.50) (hardback). ISBN 0 231 08248 7     

C. R. C. PAUL 《Geological Journal》1997,32(2):191-191

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Storm surge simulation along the Meghna estuarine area: an alternative approach   总被引：1，自引：1，他引：0  

PAUL Gour Chandr  SENTHILKUMAR Sukumar  PRIA Rana 《海洋学报(英文版)》2018,37(1):40-49

In this study, numerical prediction of surges associated with a storm was made through the method of lines (MOL) in coordination with the newly proposed RKARMS (4, 4) method for the meghna estuarine region, along the coast of Bangladesh. For this purpose, the vertically integrated shallow water equations (SWEs) in Cartesian coordinates were firstly transformed into ordinary differential equations (ODEs) of initial valued, which were then soloved using the new RKARMS (4, 4) method. Nested grid technique was employed for resolving the complexities of the region of interest with minimum cost. Fresh water discharge through the lower Meghna River was taken into account along the north east corner of the innermost child scheme. Numerical experiments were performed with the severe cyclone on April 1991 that crossed the coast over the study area. Simulated results by the study were found to be in good agreement with some reported data and were found to compare well with the results obtained by the MOL in addition with the classical 4th order Runge-Kutta (RK (4, 4)) method and the standard finite difference method (FDM).  相似文献   

BOOK REVIEW: APPLICATION OF GEOGRAPHIC INFORMATION SYSTEMS IN HYDROLOGY AND WATER RESOURCES MANAGEMENT edited by K. Kovar and H. P. Nachtnebel,International Association of Hydrological Sciences,Publication No. 211, IAHS Press,Wallingford, 1993. No. of pages: ix + 693. ISBN 0-947571-48-5.     

PAUL QUINN 《地球表面变化过程与地形》1996,21(5):487-487

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EVOLVING FACTOR ANALYSIS APPLIED TO FLOW INJECTION ANALYSIS DATA     

PAULJ.GEMPERLINE  J.CRAIGHAMILTON 《地理学报(英文版)》1989,(2)

Evolving factor analysis is used to estimate the concentration profiles and spectra of Bi~(3 )and the bismuthchloride complexes BiCl~(2 )through BiCl_6~(3-)formed by injection of bismuth percblorate into a flowingstream of 1.0 mol l~(-1) HCl.The estimated spectra compare favorably with previously published spectraof the complexes.  相似文献   

Log Evaluation of Shaly Sandstones: A Practical Guide     

PAUL F. Worthington 《Basin Research》1989,2(3):203-203

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The sodium tail of Mercury     

A. E. POTTER  R. M. KILLEN  T. H. MORGAN 《Meteoritics & planetary science》2002,37(9):1165-1172

Abstract— Mercury is difficult to observe because it is so close to the Sun. However, when the angle of the ecliptic is near maximum in the northern hemisphere, and Mercury is near its greatest eastern elongation, it can be seen against the western sky for about a half hour after sunset. During these times, we were able to map sodium D₂ emission streaming from the planet, forming a long comet‐like tail. On 2001 May 26 (U.T.) we mapped the tail downstream to a distance of ?40 000 km. Sodium velocities in the tail increased to ?11 km s^?1 at 40 000 km as the result of radiation pressure acceleration. On 2000 June 5 (U.T.) we mapped the cross‐sectional extent of the tail at a distance of ?17 500 km downstream. At this distance, the half‐power full‐width of the emission was ?20 000 km. We estimated the transverse velocity of sodium in the tail to range from 2 to 4 km s^?1. The velocities we observed imply source velocities from the planet surface of the order of 5 km s^?1, or 4 eV. Particle sputtering is a likely candidate for production of sodium atoms at these velocities. The total flux of sodium in the tail was ?1 times 10²³ atoms s^?1, which corresponds to 1 to 10% of the estimated total production rate of sodium on the planet.  相似文献   

Paleo-oceanography of the Norwegian Sea during the past 130,000 years: coccolithophorid and foraminferal data     

PAUL E. BELANGER 《Boreas: An International Journal of Quaternary Research》1982,11(1):29-36

Faunal, floral and sedimentological properties of Norwegian Sea core V27-86 were examined in order to reconstruct the paleo-oceanographic history of this region. Downcore variations in the relative abundance of three microfossil groups and several sediment properties exhibit three different climate response patterns (CRP). Each pattern is judged to represent the response of a different part of the climate system. The covariance patterns among coccoliths, henthic foraminifera, and other properties suggest that the Norwegian Sea has been ice-free and productive during the present interhlacial. the penultimate interglacial (isotopic-stage se) and at least partially ice-free during an intermediate climatic regime (stages sa-d). A maximum change in these measures occurs at the boundary between isotopic stage 5a (an intermediate climatic regime)and isotopic stage 4 (a glacial climatic regime). In contrast, planktic foraminiferal assemblages and oxygen isotope measurements on planktic foraminifera show a major change at the end of stage 5e (the penultimate interglacial). The contrasting behavior of these two sets of observations is explained by a model which postulates a low-salinity surface layer 115,000 to 75,000 years ago (stages 5a-d).  相似文献   

Neotectonics     

PAUL L. HANCOCK 《Geology Today》1988,4(2):57-61

Neotectonics is the study of Earth movements of late Cenozoic age, especially those in harmony with contemporary horizontal and vertical crustal motions. Precise information about the character, frequency and rate of recent movements is an essential part of planning how to reduce earthquake hazard, and it also allows tectonicians to devise realistic models of crustal behaviour.  相似文献   

Minerals on stamps     

PAUL W. J. GLOVER 《Geology Today》1996,12(6):223-229

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The China Clipper — fast advective transport of radon-rich air from the Asian boundary layer to the upper troposphere near California     

MARK A. KRITZ  JEAN-CLAUDE LE ROULLEY  EDWIN F. DANIELSEN 《Tellus. Series B, Chemical and physical meteorology》1990,42(1):46-61

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