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   379篇
  免费   15篇
  2022年   2篇
  2021年   2篇
  2020年   5篇
  2019年   15篇
  2018年   9篇
  2017年   17篇
  2016年   11篇
  2015年   6篇
  2014年   9篇
  2013年   110篇
  2012年   8篇
  2011年   16篇
  2010年   11篇
  2009年   7篇
  2008年   13篇
  2007年   6篇
  2006年   9篇
  2005年   6篇
  2004年   8篇
  2003年   9篇
  2002年   6篇
  2001年   13篇
  2000年   9篇
  1999年   4篇
  1998年   2篇
  1997年   3篇
  1996年   3篇
  1995年   4篇
  1994年   3篇
  1993年   8篇
  1992年   3篇
  1991年   5篇
  1990年   2篇
  1988年   2篇
  1987年   3篇
  1986年   3篇
  1985年   2篇
  1984年   4篇
  1983年   3篇
  1982年   6篇
  1981年   4篇
  1980年   3篇
  1978年   2篇
  1977年   2篇
  1976年   7篇
  1973年   1篇
  1972年   1篇
  1969年   1篇
  1968年   1篇
  1967年   1篇
排序方式: 共有394条查询结果,搜索用时 381 毫秒
21.
This study examines the interrelationship between external political support, internal organizational factors, and red tape, using a sample of information managers from state health and human service agencies. The study defines a red tape model and tests the model by structural equation modeling method. The study finds that political support has a direct effect on red tape. The higher the political support, the lower the level of red tape. The study also confirms an indirect effect of political support on red tape, mediated by developmental culture. Indirect effect through goal clarity has the correct sign but is not statistically significant. Practical recommendations are made for the political environment to provide the opportunity for managerial reforms that are often advocated.  相似文献   
22.
在甲午战争中,邓世昌、林泰曾、刘步蟾和丁汝昌等海军将领宁死不屈、战败自杀,其事迹可歌可泣,更发人深省。从他们成长经历和战斗事略,不难洞悉其自杀原因在于传统的忠君思想和荣辱观以及脆弱的国民性格。中国军人特别是各级将领应当知耻而后勇,树立正确的荣辱观,方能立于不败之地。  相似文献   
23.
24.
James Ramsay Hunt (1874-1937) was a pre-eminent twentieth-century American neurologist. The name of Ramsay Hunt is known today because several neurological disorders bear his name, including the herpetic geniculate ganglion syndrome and a form of ataxia and myoclonus. Despite his importance in the field of neurology, few biographical details have been recorded about Hunt's life. One of the authors of this report recently located Hunt's daughter. This biographical sketch was based on interviews conducted with her and review of documents in her possession, including letters written by Hunt. Details are depicted about Hunt's family background and childhood, medical education and early professional development, courtship and marriage, wartime experiences, family and social life, daily routine and professional development, as well as illness and death.  相似文献   
25.
Harvesting different species as foods or raw materials calls for differing skills depending on the species being harvested and the circumstances under which they are being taken. In some situations and for some species, the tactics used are mainly behavioral—that is, people adjust, or adapt, their own actions to fit the behavior and circumstances of the species they are taking. Under other circumstances and for other species, the skills and tactics used may call for greater environmental preparation or manipulation. Therefore, instead of trying to distinguish people today and in the past as either foragers or farmers, it makes sense to define human subsistence behavior as an interactive matrix of species and harvesting tactics, that is, as a provisions spreadsheet.  相似文献   
26.
大数据背景下国内人文地理研究进展与方法审视   总被引:3,自引:0,他引:3  
通过梳理人文地理领域杂志近年大数据文章解释其与大数据应用的关系,强调其应用给人文地理学研究带来机遇和挑战:①大数据作为研究方法,不能代替传统人文地理研究范式,而是对现研究方法的补充。大数据和小数据需对话交流;②大数据本身是一种话语权,嵌入人文地理研究系统。保证人文地理学多样性,避免过度依赖大数据,需在批判角度审视和运用;③需关注大数据对于人文地理学研究方法和思想的影响;④运用大数据解读地理和空间过程复杂性的同时,应看到大数据应用对公共服务的潜力,思考其结果如何更好的服务社会。  相似文献   
27.
28.
In an era of rapid geographical data acquisition, interpretations of remote sensing products are an integral part of many undergraduate geography degree schemes but there are fewer opportunities for collection and processing of primary remote sensing data. Unmanned Aerial Vehicles (UAVs) provide a relatively inexpensive opportunity to introduce the principles and practice of airborne remote sensing into field courses, enabling students to learn about image acquisition, data processing and interpretation of derived products. Two case studies illustrate how a low-cost “DJI Phantom Vision+” UAV can be used by students to acquire images that can be processed using Structure-from-Motion photogrammetry software. Results from a student questionnaire and analysis of assessed student reports showed that using UAVs enhanced student engagement and equipped them with data processing skills. The derivation of bespoke orthophotos and Digital Elevation Models has the potential to provide students with opportunities to gain insight into various remote sensing data quality issues, although additional training is required to maximize this potential. Recognition of the successes and limitations of this teaching intervention provides scope for improving future UAV exercises. UAVs are enabling both a reconstruction of how we measure the Earth’s surface and a reconstruction of how students do fieldwork.  相似文献   
29.
30.
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