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   623篇
  免费   18篇
各国政治   45篇
工人农民   32篇
世界政治   50篇
外交国际关系   49篇
法律   257篇
中国政治   6篇
政治理论   183篇
综合类   19篇
  2020年   8篇
  2019年   11篇
  2018年   13篇
  2017年   21篇
  2016年   23篇
  2015年   15篇
  2014年   21篇
  2013年   103篇
  2012年   25篇
  2011年   14篇
  2010年   17篇
  2009年   10篇
  2008年   20篇
  2007年   19篇
  2006年   21篇
  2005年   22篇
  2004年   17篇
  2003年   17篇
  2002年   19篇
  2001年   10篇
  2000年   11篇
  1999年   17篇
  1998年   11篇
  1997年   12篇
  1996年   6篇
  1995年   9篇
  1994年   10篇
  1993年   4篇
  1992年   6篇
  1991年   5篇
  1990年   5篇
  1989年   4篇
  1988年   9篇
  1987年   10篇
  1986年   6篇
  1985年   9篇
  1984年   12篇
  1983年   4篇
  1982年   7篇
  1981年   7篇
  1980年   6篇
  1979年   4篇
  1978年   6篇
  1977年   4篇
  1974年   3篇
  1972年   6篇
  1970年   3篇
  1967年   3篇
  1966年   2篇
  1965年   2篇
排序方式: 共有641条查询结果,搜索用时 15 毫秒
51.
The purpose of this article is to discuss some basic methods for optimally allocating federal money to cities. Optimally allocating in this context means using the quantitative methods of operations research, management science, and related fields in order to allocate federal money to cities in such a way as to (1) maximize benefits subject to a given budget, (2) minimize costs subject to a minimum satisfaction level, or (3) maximize benefits minus costs. The basic methods include (1) allocating by marginal rates of return, which partly relies or statistical regression analysis; and (2) allocating by part/whole percentages, which partly relies on ideas associated with multiattribute utility theory. The basic methods will be illustrated with the example of allocating anticrime dollars to cities, although one could easily reason by analogy to allocation in any subject matter area.  相似文献   
52.
53.
A controlled laboratory experiment was conducted in order to investigate the effect of the method of burial (i.e. the presence of coffin and clothing) on the formation of adipocere. This study follows previous studies by the authors who have investigated the effect of physical conditions on the formation of adipocere present in a controlled burial environment. The study utilises infrared spectroscopy to provide a preliminary lipid profile of the remains following a 12 month decomposition period. Inductively coupled plasma-mass spectrometry was employed as a technique for determining the salts of fatty acids present in adipocere. Gas chromatography-mass spectrometry (GC-MS) was used as the confirmatory test for the identification and determination of the chemical composition of adipocere which formed in the controlled burial environments. The results suggest that coffins will retard the rate at which adipocere forms but that clothing enhances its formation. The results concur with previous observations on adipocere formation in burial environments.  相似文献   
54.
This study examined effects of clothing cues on children's identification accuracy from lineups. Four- to 14-year-olds (n = 228) saw 12 video clips of individuals, each wearing a distinctly colored shirt. After watching each clip children were presented with a target-present or target-absent photo lineup. Three clothing conditions were included. In 2 conditions all lineup members wore the same colored shirt; in the third, biased condition, the shirt color of only one individual matched that seen in the preceding clip (the target in target-present trials and the replacement in target-absent trials). Correct identifications of the target in target-present trials were most frequent in the biased condition, whereas in target-absent trials the biased condition led to more false identifications of the target replacement. Older children were more accurate than younger children, both in choosing the target from target-present lineups and rejecting target-absent lineups. These findings suggest that a simple clothing cue such as shirt color can have a significant impact on children's lineup identification accuracy.  相似文献   
55.
56.
57.
The analysis of fatty acids from common vegetable oils was investigated for application to forensic casework. A base-catalyzed transesterification of the fatty acids to fatty acid methyl esters using tetramethylammonium hydroxide was simple, rapid, straightforward and inexpensive. Canola, corn, olive, peanut, safflower, soybean and sunflower oils were able to be classified based on their fatty acid methyl ester profiles. Using gas chromatography-mass spectrometry, the detection limits for canola, corn, olive, peanut and safflower oils were determined to be 0.4 mg/mL or less and 0.2 mg/mL or less for soybean and sunflower oils.  相似文献   
58.
59.
The objective of this paper is to introduce managers of R&D operations to tax issues that must be considered when technology is transferred across international boundaries within the same company. The tax implications are often misunderstood or even overlooked in the technology transfer process. The paper explains how countries seek to tax their fair share of the income earned inside their borders. Since the amount of income earned depends on the price for technology paid by one part of a company to another, this transfer price is of keen interest to the tax authorities. To preserve their tax bases, therefore, countries establish rules to regulate the international transfer of goods and services, including technology, between related parties. This paper provides an overview of the economic principles underlying these rules, and illustrates their application with a series of examples.  相似文献   
60.
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