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第十六届全国等离子体科学技术会议暨第一届全国等离子体医学研讨会

作者： Xie Kan Derek Blash John D Williams School of Aerospace Engineering Beijing Institute of Technology ceppe School of Mechanical EngineeringColorado State University

The analysis here predicts the net electron emission current as a function of bias voltage for a plasma source that is being used as the cathodic element in a bare electrodynamic tether system.A spherical,steady-state model that considers the collisionless plasma plume expansion process on the operation of electron-emission is *** prediction results match well with the laboratory experiment results in the low electron-emission current *** difference at the turning point in big electron emission current range indicates the ionization process plays an important role and should be counted in the developed *** typical prediction results and experimental result are presented and compared in Fig.1.

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Quaternary： “Quo Vadis”？

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Episodes 2005年第3期28卷 197-200页

作者： Kenitiro Suguio Alethéea Ernandes Martins Sallun Emilio A. A. Soares Centro de Pós-Graduacāo Pesquisa e Extensāo （CEPPE） Universidade Guarulhos （UnG） Praca Tereza Cristina 01-Guarulhos-SP-Brazil-07023-070 Programa de Pós-Graduacāo em Geologia Sedimentar-Instituto de Geociencias Universidade de Sāo Paulo Rua do Lago 562-Sāo Paulo-SP-Brazil-05508-080 Departamento de Geociencias Universidade Federal do Amazonas Av. Gal. Rodrigo O.J. Ramos 3000 Manaus-AM-Brazil-69077-000

The Quaternary, like the long-abandoned terms Primary, Secondary and Tertiary, is a very ambiguous word, whose chronological meaning is not very well defined. Its usage spread very quickly, perhaps due to its more-or-less close relationship with the human history and with the latest glaciations. However, the oldest of human fossil record, according to recent discoveries in Africa （Djourab Desert in Tchad）, is about 7 million years old, rather than 2 million years as suggested by fossils at OlduvaL Moreover, for some time now, it has been known that the first Quaternary-type glaciations occurred in several regions of the Earth between 2.5 and 3 million years ago, that is prior to the Pliocene-Pleistocene limit at 1.81 million years ago, as determined by the GSSP. These facts have led some researchers, mostly from the International Union of Geological Sciences （lUGS）, and from the International Association for Quaternary Research （INQUA）, to suggest changes in the subdivision of the Neocenozoic. Certainly, discussions on this subject will be raised at many scientific meetings in the near future until almost unanimous agreement can be attained. Some additional suggestions are presented here, as a contribution to resolution of these nomenclatorial issues.

关键词：冰河作用化石非洲更新世上新世冰川

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