中文版 | English

在结果中检索

GSTDTAP

浏览/检索结果: 共4条，第1-4条 帮助

已选(0)清除 条数/页：   排序方式：
Synchrotron infrared spectroscopic evidence of the probable transition to metal hydrogen 期刊论文
NATURE, 2020, 577 (7792) : 631-+
作者:  Zhuang, Zhe;  Yu, Jin-Quan
收藏  |  浏览/下载：33/0  |  提交时间：2020/07/03

Hydrogen has been an essential element in the development of atomic, molecular and condensed matter physics(1). It is predicted that hydrogen should have a metal state(2)  however, understanding the properties of dense hydrogen has been more complex than originally thought, because under extreme conditions the electrons and protons are strongly coupled to each other and ultimately must both be treated as quantum particles(3,4). Therefore, how and when molecular solid hydrogen may transform into a metal is an open question. Although the quest for metal hydrogen has pushed major developments in modern experimental high-pressure physics, the various claims of its observation remain unconfirmed(5-7). Here a discontinuous change of the direct bandgap of hydrogen, from 0.6 electronvolts to below 0.1 electronvolts, is observed near 425 gigapascals. This result is most probably associated with the formation of the metallic state because the nucleus zero-point energy is larger than this lowest bandgap value. Pressures above 400 gigapascals are achieved with the recently developed toroidal diamond anvil cell(8), and the structural changes and electronic properties of dense solid hydrogen at 80 kelvin are probed using synchrotron infrared absorption spectroscopy. The continuous downward shifts of the vibron wavenumber and the direct bandgap with increased pressure point to the stability of phase-III hydrogen up to 425 gigapascals. The present data suggest that metallization of hydrogen proceeds within the molecular solid, in good agreement with previous calculations that capture many-body electronic correlations(9).


  
Water and life from snow: A trillion dollar science question 期刊论文
WATER RESOURCES RESEARCH, 2017, 53 (5)
作者:  Sturm, Matthew;  Goldstein, Michael A.;  Parr, Charles
收藏  |  浏览/下载：26/0  |  提交时间：2019/04/09
snow  water  climate regulation  present value  discount rate  valuation  
Economic analysis of photovoltaic systems for the residential market under China's new regulation 期刊论文
ENERGY POLICY, 2017, 101
作者:  Rodrigues, Sandy;  Chen, Xiaoju;  Morgado-Dias, F.
收藏  |  浏览/下载：6/0  |  提交时间：2019/04/09
China  Feed in tariff  Photovoltaic  Discounted Payback Period  Net Present Value  The Internal Rate of Return  
Feasibility Study of Economics and Performance of Solar Photovoltaics at the Santo Domingo Pueblo in Sandoval County, New Mexico 科技报告
来源：US Department of Energy (DOE). 出版年： 2013
作者:  Geiger, J.;  Lisell, L.;  Mosey, G.
收藏  |  浏览/下载：21/0  |  提交时间：2019/04/05
EPA  PUEBLO OF SANTO DOMINGO  SANDOVAL COUNTY  NEW MEXICO  FEASIBILITY STUDY  PHOTOVOLTAIC  PV  FINANCING  RESOURCE CONSERVATION AND RECOVERY ACT  RCRA  NET PRESENT VALUE  NPV  NET METERING  BROWNFIELD  JEDI  SYSTEM ADVISOR MODEL  SAM  ECONOMICS  Solar En