首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   48篇
  免费   1篇
电工技术   2篇
综合类   2篇
化学工业   2篇
机械仪表   1篇
建筑科学   10篇
矿业工程   4篇
能源动力   2篇
轻工业   1篇
石油天然气   2篇
无线电   2篇
一般工业技术   13篇
冶金工业   5篇
自动化技术   3篇
  2022年   1篇
  2020年   1篇
  2019年   1篇
  2017年   2篇
  2016年   2篇
  2015年   1篇
  2014年   4篇
  2013年   1篇
  2012年   1篇
  2011年   3篇
  2010年   2篇
  2009年   5篇
  2008年   3篇
  2007年   2篇
  2006年   3篇
  2005年   5篇
  2002年   1篇
  2001年   1篇
  1999年   2篇
  1998年   1篇
  1994年   1篇
  1993年   1篇
  1991年   1篇
  1986年   1篇
  1984年   1篇
  1981年   1篇
  1958年   1篇
排序方式: 共有49条查询结果,搜索用时 34 毫秒
1.
2.
SLUG试验及其水文地质参数的研究   总被引:1,自引:0,他引:1  
Slug试验是通过记录地下水位瞬间变化来评价水文地质参数的现场测试方法。本文是在国外该试验发展的基础上,通过利用高精度测试,尝试对中、高渗透率含水层各参数进行测定。基于现场测试和已有的抽水资料,初步探讨了各种理论模型的不同,并以经典Cooper模型分析计算长春某场地的水文地质参数;通过对比抽水试验,验证了该试验的准确性...  相似文献   
3.
The photoionization processes of excited hydrogen atoms in plasma environments are investigated using the method of complex coordinate rotation. The standard Debye–Hückel model and modified Debye–Hückel model are adopted to describe the plasma screening effects. The photoionization cross sections of plasma-embedded excited hydrogen atoms varied with different screening lengths are displayed to illustrate the influence of plasma screening. The results of the Debye–Hückel model compared with the modified Debye–Hückel are presented. The shape resonances and Cooper minima due to the plasma screening are observed and discussed.  相似文献   
4.
Unlike most glamorous new high-rise apartment buildings in downtown Manhattan, this thin, tilted white glass tower provides homes away from home for chic out-of-towners. And what ‘homes’ they are. Upstairs are astounding long-range views; on the lower floors, a series of glass-walled lounges, restaurants, balconies, a garden and even a library with a wood-burning fireplace. And, as Jayne Merkel explains, these sensual pleasures are mixed with intellectual ones. There are art and travel books in every room and guests can enjoy ‘movie nights’ in the screening room.  相似文献   
5.
How are urban actors, such as landscape designers, community groups, developers and local politicians, actively restructuring their environments to meet the challenges of the American city in the new global context? Grahame Shane outlines the approaches to landscape that have been emerging since the mid-20th century and are set to recombine urban assemblages whether they are located in historic city centres, postindustrial waterfronts or suburban sprawl. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   
6.
我国铜尾矿资源调查分析   总被引:10,自引:1,他引:9  
通过调查,利用全国各铜矿山历年的铜精矿产量、选矿比等相关数据,对全国和各省(区)的铜尾矿总量进行了分析统计,并对各省(区)的铜尾矿资源进行了聚类分析,为我国铜尾矿资源的开发管理提供了基础依据。  相似文献   
7.
Letter comments that, about four years ago, Irving S. Cooper, a neurosurgeon in New York City, developed a new type of brain surgery designed to alleviate the tremor and rigidity associated with Parkinson's Disease. As Cooper's work and research progressed, it soon became evident that a significant factor in the selection of appropriate candidates was the patient's psychological and mental condition. Thus it was decided to add a clinical psychologist to the team of professional and rehabilitation people carrying out preoperative evaluation. So far as the letter's author knows, St, Barnabas Hospital is the only setting in this country in which psychologists work so closely with a Department of Neurologic Surgery in both a clinical and research role. The author feels it is significant to report this development which opens up a broad new area for which psychological services are utilized. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
8.
Induced seismicity associated with Enhanced Geothermal Systems   总被引:2,自引:0,他引:2  
Enhanced Geothermal Systems (EGS) have the potential to make a significant contribution to the world energy inventory. One controversial issue associated with EGS, however, is the impact of induced seismicity or microseismicity, which has been the cause of delays and threatened cancellation of at least two EGS projects worldwide. Although microseismicity has in fact had few (or no) adverse physical effects on operations or on surrounding communities, there remains public concern over the amount and magnitude of the seismicity associated with current and future EGS operations. The primary objectives of this paper are to present an up-to-date review of what is already known about the seismicity induced during the creation and operation of EGS, and of the gaps in our knowledge that, once addressed, should lead to an improved understanding of the mechanisms generating the events. Several case histories also illustrate a number of technical and public acceptance issues. We conclude that EGS-induced seismicity need not pose a threat to the development of geothermal energy resources if site selection is carried out properly, community issues are handled adequately and operators understand the underlying mechanisms causing the events. Induced seismicity could indeed prove beneficial, in that it can be used to monitor the effectiveness of EGS operations and shed light on geothermal reservoir processes.  相似文献   
9.
沈建其  祝洪良  朱红毅 《激光与红外》2002,32(5):315-316,320
文中研究了光声耦合所导致的光子Cooper对的形成机制,计算了光子Cooper对的能隙(0.01eV)和尺度(10^-5m)以及内禀角动量(奇数),并简要讨论了几十开低温下介质中光的超流效应的可能性。由于在低温下, 光子Cooper对不容易受到热运动的激发,因此有可能存在光的超流现象。  相似文献   
10.
Provides the biography of Lynn A. Cooper and announces that she has received the Distinguished Scientific Award for an Early Career Contribution to Psychology (1980) for her incisive investigations of the nature and individual variation of the internal processes of visual representation, transformation, and comparison by means of which we identify, discriminate, and prepare for external objects and events. A selected bibliography is also provided. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号