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   1070篇
  免费   71篇
各国政治   55篇
工人农民   40篇
世界政治   107篇
外交国际关系   130篇
法律   471篇
中国政治   4篇
政治理论   325篇
综合类   9篇
  2023年   10篇
  2021年   6篇
  2020年   28篇
  2019年   35篇
  2018年   35篇
  2017年   54篇
  2016年   62篇
  2015年   38篇
  2014年   40篇
  2013年   151篇
  2012年   35篇
  2011年   54篇
  2010年   38篇
  2009年   40篇
  2008年   38篇
  2007年   26篇
  2006年   35篇
  2005年   40篇
  2004年   42篇
  2003年   40篇
  2002年   28篇
  2001年   17篇
  2000年   26篇
  1999年   18篇
  1998年   17篇
  1997年   15篇
  1996年   11篇
  1995年   9篇
  1994年   7篇
  1993年   16篇
  1992年   8篇
  1991年   14篇
  1990年   14篇
  1989年   10篇
  1988年   6篇
  1987年   8篇
  1985年   11篇
  1984年   5篇
  1983年   7篇
  1982年   6篇
  1981年   3篇
  1980年   5篇
  1979年   3篇
  1978年   4篇
  1977年   4篇
  1976年   2篇
  1975年   5篇
  1974年   4篇
  1972年   3篇
  1970年   2篇
排序方式: 共有1141条查询结果,搜索用时 15 毫秒
351.
Abstract: Sweeping changes in administrative review legislation and procedures have occurred in Australian Federal government very quickly and with little debate. There have been several assumptions underlying the proposals for administrative law reform, including the notions that government has expanded greatly, that it has intruded into citizens' lives, that it is scarcely restrained by parliament, and that the specialist administrative tribunals established at various times are only partly effective. While these assumptions are all correct in certain respects, they do not necessarily support the demands for administrative law reform in the manner and to the extent that has generally been proposed. Closer examination of these assumptions suggests that comprehensive administrative review might itself lead to further expansion of government; that political decisions will have to be made about degrees of intrusion by government; that political avenues for redress of grievances should not be ignored, and could possibly be developed further; and that the need to prevent administrative errors is at least as great as the need to correct them after they have occurred. There is a good case for comprehensive administration review, but it needs to be examined more closely so that future problems can be anticipated and avoided.  相似文献   
352.
353.
354.
The various pronatalist policies enacted between World War I and World War II by three European countries are presented within the context of a “coercive” and “noncoercive” policy dichotomy. The social context in which Italy, Germany, and Sweden enacted pronatalist policies is examined with special emphasis on Italian and German migration policies. An attempt is made to assess the impact of the various pronatalist measures on birth rates. Implications of the study indicate that knowledge of existing overt pronatalist policies and an understanding of the social milieu in which such policies are enacted will help present-day population policy planners.  相似文献   
355.
As a governor, Ralph Darling is remembered more for his authoritarian behaviour and harsh rule than for his administrative achievements. Only recently have historians shown much awareness of the important reforms which he made in the machinery of government. Yet, although attention has been drawn to this aspect of his work it has not been adequately examined. The tendency is still to concentrate on the colourful and controversial features of his regime, pushing to one side its more mundane developments. Admittedly, there are exceptions. J. W. Cell included an interesting section on Darling in British Colonial Administration in the Mid-Nineteenth Century , as did J. J. Eddy in Britain and the Australian Colonies. The first of these treatments is too brief, however, and the second concentrates on those aspects affected by the attempts of the British Treasury to exert more influence over colonial administration. Despite these books, the valuable thesis on the Colonial Secretary's Office by G. D. Richardson and the helpful prefaces that appear in the various guides to the records of government departments, prepared by the State Archives of New South Wales, much remains to be done. Most of the departments that existed under Darling still await detailed treatment both in themselves and in relation to the overall changes that were made between 1825 and 1831. As matters stand, there is a gap not only in what was a vital era in the administrative history of New South Wales, but also in Darling's own record. The present paper attempts to repair this omission.  相似文献   
356.
357.
358.
This paper examines the potential of infrared chemical (hyperspectral) imaging as a technique for the forensic analysis of automotive paint chips in particular, and multicomponent (e.g., layered) samples in general. Improved sample preparation procedures for the infrared analysis of paint chips are detailed, with the recommendation that where mounting resins are chemically incompatible with the sample, it is better to mount and section the sample in a soft wax from which the sections can be removed and pressed into a KBr disk for transmission analysis. Infrared chemical images of multilayered paint chips have been successfully obtained, with the chief advantage over conventional infrared analysis being that thousands of infrared spectra are collected in a few minutes across the whole sample, at a spatial resolution of around 5 microm. As with conventional infrared spectroscopy, chemical species can be identified from their spectra, but the wealth of information available can be also extracted in a number of different ways that make multicomponent spectral (and hence chemical) comparisons between two samples easy to visualize and understand. In one approach, the infrared chemical images of two paint chips being compared side-by-side can be viewed as a "movie," in which each frame is an intensity map of the two samples at a given wavenumber (frequency) value. In another approach, the spectra (pixels) in the image files are classified into chemically similar groups, resulting in a "cluster" image that makes it possible to simultaneously compare all of the layers in two paint chips. These methods are applicable to other multicomponent samples, and also to other chemical imaging techniques.  相似文献   
359.
The extraction of DNA from archaeological or forensic skeletal remains can provide quite powerful data for analysis, but is plagued by a unique set of methodological problems. One of the most important methodological problems to overcome in such analyses is the presence of modern contamination on the surfaces of bones and teeth, which can lead to false positives and erroneous results unless it is removed before DNA extraction is initiated. Ancient DNA (aDNA) researchers and forensic scientists have employed a number of techniques to minimize such contamination. One such technique is the use of bleach (sodium hypochlorite--NaOCl) to "destroy" contaminating DNA. However, a consensus on the optimum concentration of sodium hypochlorite to be used and the amount of time the bone or tooth should be exposed to it has not emerged. The present study systematically approaches the issue by introducing contamination to ancient bones (from approximately 500 BP) and determining which of several sodium hypochlorite treatments best eliminates surface contamination. The elimination of surface contamination from bone requires immersion in at least 3.0% (w/v) sodium hypochlorite (approximately equal parts of commercial bleach and water) for at least 15 min. Endogenous DNA proved to be quite stable to even extreme sodium hypochlorite treatments (6% for 21 h), suggesting that DNA adsorbs to hydroxyapatite in the bone and that this process facilitates the preservation of DNA in ancient skeletal remains.  相似文献   
360.
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