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新研究称地球生命的发展影响了地球下地幔 快报文章
地球科学快报，2022年第07期
作者:  刘文浩
Microsoft Word(16Kb)  |  收藏  |  浏览/下载：751/0  |  提交时间：2022/04/08
Cambrian Explosion  deep-Earth carbon cycle  mantle  
High-Broadband Seismoacoustic Signature of Vulcanian Explosions at Popocatepetl Volcano, Mexico 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (1) : 148-157
作者:  Matoza, Robin S.;  Arciniega-Ceballos, Alejandra;  Sanderson, Richard W.;  Mendo-Perez, Gerardo;  Rosado-Fuentes, Alejandro;  Chouet, Bernard A.
收藏  |  浏览/下载：20/0  |  提交时间：2019/04/09
Popocatepetl  infrasound  seismic  array  explosion  airwave  
Trilobite evolutionary rates constrain the duration of the Cambrian explosion 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2019, 116 (10) : 4394-4399
作者:  Paterson, John R.;  Edgecombe, Gregory D.;  Lee, Michael S. Y.
收藏  |  浏览/下载：14/0  |  提交时间：2019/11/27
Cambrian explosion  evolutionary rates  trilobites  Bayesian tip-dating  morphological clock  
A Historical Evaluation of the U15 Complex, Nevada National Security Site, Nye County, Nevada 科技报告
来源：US Department of Energy (DOE). 出版年： 2014
作者:  Drollinger, Harold;  Holz, Barbara A;  Bullard, Thomas F;  Goldenberg, Nancy G;  Ashbaugh, Laurence J;  Griffin, Wayne R
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This report presents a historical evaluation of the U15 Complex on the Nevada National Security Site (NNSS) in southern Nevada. The work was conducted by the Desert Research Institute at the request of the U.S. Department of Energy  National Nuclear Security Administration Nevada Field Office and the U.S. Department of Defense  Defense Threat Reduction Agency. Three underground nuclear tests and two underground nuclear fuel storage experiments were conducted at the complex. The nuclear tests were Hard Hat in 1962  Tiny Tot in 1965  and Pile Driver in 1966. The Hard Hat and Pile Driver nuclear tests involved different types of experiment sections in test drifts at various distances from the explosion in order to determine which sections could best survive in order to design underground command centers. The Tiny Tot nuclear test involved an underground cavity in which the nuclear test was executed. It also provided data in designing underground structures and facilities to withstand a nuclear attack. The underground nuclear fuel storage experiments were Heater Test 1 from 1977 to 1978 and Spent Fuel Test - Climax from 1978 to 1985. Heater Test 1 was used to design the later Spent Fuel Test - Climax experiment. The latter experiment was a model of a larger underground storage facility and primarily involved recording the conditions of the spent fuel and the surrounding granite medium. Fieldwork was performed intermittently in the summers of 2011 and 2013  totaling 17 days. Access to the underground tunnel complex is sealed and unavailable. Restricted to the surface  four buildings  four structures  and 92 features associated with nuclear testing and fuel storage experiment activities at the U15 Complex have been recorded. Most of these are along the west side of the complex and next to the primary access road and are characteristic of an industrial mining site  albeit one with scientific interests. The geomorphological fieldwork was conducted over three days in the summer of 2011. It was discovered that major modifications to the terrain have resulted from four principal activities. These are road construction and maintenance  mining activities related to development of the tunnel complex  site preparation for activities related to the tests and experiments  and construction of drill pads and retention ponds. Six large trenches for exploring across the Boundary geologic fault are also present. The U15 Complex  designated historic district 143 and site 26NY15177  is eligible to the National Register of Historic Places under Criteria A  C  and D of 36 CFR Part 60.4. As a historic district and archaeological site eligible to the National Register of Historic Places  the Desert Research Institute recommends that the area defined for the U15 Complex  historic district 143 and site 26NY15117  be left in place in its current condition. The U15 Complex should also be included in the NNSS cultural resources monitoring program and monitored for disturbances or alterations.