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91.
D. Pollacco I. Skillen A. Cameron D. Christian J. Irwin T. Lister R. Street R. West W. Clarkson N. Evans A. Fitzsimmons C. Haswell C. Hellier S. Hodgkin K. Horne B. Jones S. Kane F. Keenan A. Norton J. Osborne R. Ryans P. Wheatley 《Astrophysics and Space Science》2006,304(1-4):253-255
The WASP project and infrastructure supporting the SuperWASP Facility are described. As the instrument, reduction pipeline and archive system are now fully operative we expect the system to have a major impact in the discovery of bright exo-planet candidates as well in more general variable star projects. 相似文献
92.
Gilbert R.W. Zedler E.A. Grilli S.T. Street R.L. 《Oceanic Engineering, IEEE Journal of》2007,32(1):236-248
In this paper, we report on the use of a numerical wave tank (NWT), based on fully nonlinear potential flow (FNPF) equations, in driving simulations of flow and sediment transport around partially buried obstacles. The suspended sediment transport is modeled in the near-field in a Navier-Stokes (NS) model using an immersed-boundary method and an attached sediment transport simulation module. Turbulence is represented by large eddy simulation (LES). The NWT is based on a higher order boundary element method (BEM), with an explicit second-order time stepping. Hence, only the NWT boundary is discretized. The solution for the velocity potential and its derivatives along the boundary is obtained in the BEM, which subsequently provides a solution at any required internal point within the domain. At initial time, the NS-LES model domain is initialized with the 3-D velocity field provided by the NWT and driven for later time by the pressure gradient field obtained in the NWT. Incident wave fields, as specified in the NWT to drive sediment transport, can be arbitrary. Applications are presented here for single frequency waves, such as produced by a harmonic piston wavemaker in the laboratory, and modulated frequency wave groups. The feasibility of coupling the irrotational flow and NS solutions is demonstrated. 相似文献
93.
R. A. Street D. J. Christian W. I. Clarkson A. Collier Cameron B. Enoch S. R. Kane T. A. Lister R. G. West D. M. Wilson A. Evans A. Fitzsimmons C. A. Haswell C. Hellier S. T. Hodgkin K. Horne J. Irwin F. P. Keenan A. J. Norton J. Osborne D. L. Pollacco R. Ryans I. Skillen P. J. Wheatley J. Barnes 《Monthly notices of the Royal Astronomical Society》2007,379(2):816-832
94.
Previous studies have demonstrated long‐term changes in effective moisture in sub‐Saharan Africa. Here, we reconstruct Holocene environments using a ~7 m lake‐sediment sequence recovered from the northeastern Nigerian Sahel and attempt to distinguish basin‐specific changes from regional climatic variations. The sequence was analysed for sedimentological properties, mineral magnetism and pollen, and dated by 137Cs, 210Pb excess and 14C. Extremely arid conditions of the terminal Pleistocene ended ca. 11 500 cal. BP (calendar years) when climate ameliorated and a lake developed until the occurrence of an arid event leading to lake desiccation at ~11 200 cal. BP. Following this, climate ameliorated and a water body re‐emerged. Very wet conditions predominated 11 200–5600 cal. BP, followed by drought between 5600 and 5500 cal. BP and a return to moderate humidity from 5500 to 4000 cal. BP. After 4000 cal. BP, a marked deterioration occurred, culminating in lake desiccation at ca. 800 cal. BP. After this time the climate remained generally dry and the re‐emerging lake was shallow. Comparison of these results with other well‐dated sequences in the region demonstrates the importance of basin‐specific influences on the palaeolimnological records in addition to regional climatic controls. Disentangling these different controls, as well as the reconstruction of Holocene climate, therefore requires a multiple‐basin approach. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
95.
记述了来自重庆綦江中白垩统夹关组恐龙足迹群,命名了甲龙亚目的中国綦江足迹(Qijiangpussinensis ichnogen.et ichnosp.nov.)、兽脚亚目的敏捷舞足迹(Wupusagilis ichnogen.etichnosp.nov.)和鸟脚亚目的炎热老瀛山足迹(Laoyingshanpus torridus ichnogen.etichnosp.nov.)和莲花卡利尔足迹(Caririchniumlotusichnosp.nov.)等新属种。中国綦江足迹是中国首次发现甲龙类的足迹。莲花卡利尔足迹提供了鸭嘴龙类在各发育阶段所留下不同的足迹。 相似文献
96.
97.
One hundred thirty-four horizontally polarized shear-wave (SH) seismic soundings have been performed in the Jackson Purchase Region of western Kentucky. These data have been used to derive the thicknesses and shear-wave velocities for the various impedance horizons in the upper 30 m of the soil column at each site for the purposes of general land-use management and loss estimation in the event of an earthquake. A generalized seismic susceptibility soil classification scheme adopted by the Borcherdt (1994a,b) was fit to the results. Soils across western Kentucky were found to be either SC-II or SC-III soils, correlating to gravelly soils having soft to firm consistency and stiff clays to loose/dense sands, respectively. 相似文献
98.
本文分析了1980年7月17~28日逐日200hPa辐散环流的变化过程。讨论了辐散环流变化与西太平洋副热带高压、台风活跃与中断、南海赤道反气旋形成与消失之间的关系,揭示了一些有意义的事实 相似文献
99.
100.
为探究太平洋褶柔鱼(Todarodes pacificus)秋生群资源丰度波动的原因,本研究利用适宜产卵的海表温度(SST)和水深数据,构建了太平洋褶柔鱼秋生群1979—2018年40年潜在产卵场模型,在此基础上开发了适宜海表温度均值(MVSS)、适宜性海表温度加权面积(SSWA)和等温线经向位置(MP)3种产卵场指数... 相似文献