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   8259篇
  免费   212篇
各国政治   441篇
工人农民   349篇
世界政治   527篇
外交国际关系   319篇
法律   5109篇
中国共产党   1篇
中国政治   35篇
政治理论   1595篇
综合类   95篇
  2020年   91篇
  2019年   113篇
  2018年   173篇
  2017年   174篇
  2016年   192篇
  2015年   144篇
  2014年   157篇
  2013年   902篇
  2012年   229篇
  2011年   229篇
  2010年   178篇
  2009年   201篇
  2008年   226篇
  2007年   218篇
  2006年   218篇
  2005年   181篇
  2004年   187篇
  2003年   181篇
  2002年   189篇
  2001年   316篇
  2000年   297篇
  1999年   233篇
  1998年   91篇
  1997年   115篇
  1996年   93篇
  1995年   88篇
  1994年   103篇
  1993年   84篇
  1992年   167篇
  1991年   190篇
  1990年   167篇
  1989年   179篇
  1988年   153篇
  1987年   146篇
  1986年   178篇
  1985年   138篇
  1984年   132篇
  1983年   140篇
  1982年   88篇
  1981年   82篇
  1980年   64篇
  1979年   114篇
  1978年   68篇
  1977年   67篇
  1976年   57篇
  1975年   70篇
  1974年   85篇
  1973年   76篇
  1972年   68篇
  1971年   62篇
排序方式: 共有8471条查询结果,搜索用时 15 毫秒
21.
Alcohol consumption in post-communist Kazakhstan remains at high levels and episodic heavy drinking, characteristic of the spirits-drinking regions of the former USSR, is still the national drinking style. Reported levels of alcohol-related harm are rising but assessment of trends in levels of consumption and harm is hindered by the disruption to data collection in the post-independence period and the continuing poor availability of public information. There is evidence however that changes in the republic's ethnic profile are connected with a downward trend in overall consumption rates, though changes in lifestyles may be leading to more drinking amongst women and young people. The numbers undergoing treatment for alcohol problems are greater than ever before. Alcohol problems are still perceived as entrenched and non-urgent, but in the present climate of greater stability and prosperity they are beginning to attract more attention from government. Underlying policy trends will depend on the overall direction of Kazakhstan's political and cultural development. This article assesses drinking patterns and related problems in Kazakhstan, and examines government responses and policies. The article is based on documentary research, visits to organisations and interviews.  相似文献   
22.
23.
24.
Bloodstains were made with 200 microliters blood on each of 11 different common substrates to examine the effect of the stain carrier on the amount and quality of DNA recoverable. High-molecular-weight DNA was extracted from all samples after 2 days. The yield of DNA from each sample varied considerably, not only between the different stain carriers but also within a given category. With a DNA yield of up to 10 micrograms, paper, glass, nylon, wood, smooth leather and wool gave the best results, followed by blue denim and wallpaper (up to 6 micrograms), cotton fabric and carpeting (up to 4 micrograms) and suede (up to 2 micrograms). For several stain carriers the DNA-containing solution was contaminated by chemical substances, which in the case of the blue denim, suede, and carpet samples inhibited the digestion of the DNA with restriction enzymes and prevented DNA typing. The different textures of the stain carriers tested and (as for varying yields on the same carrier) the differing degree of loss of DNA during extraction and the physiological variation in the number of leukocytes in human blood are discussed as possible reasons for the wide range of variation in the amounts of DNA it was possible to extract.  相似文献   
25.
With new technically advanced methods and computers at our disposal, the efficient market hypothesis is once again being debated. At the same time, we are witnessing an unprecedented growth in both existing and new financial markets. These new markets are often in economies which have just recently embraced free market economics; we term these stock markets infant markets. Such stock markets are obviously not efficient in allocating the supply of savings to productive capital. We do not test whether or not these infant markets are informationally efficient, but instead examine whether and how they are becoming more efficient. We propose modelling the excess returns of individual securities using a multi-factor model with time-varying coefficients and generalised auto-regressive conditional heteroskedastic (GARCH) errors. If the markets are becoming more informationally efficient or the agents are learning, we would expect this to manifest itself as the time-varying coefficients becoming more stable as time increases. We test our model using data on four Bulgarian shares. First, we estimate an AR(2) model and a GARCH-M(1,1) model for the shares. Then, we estimated our AR(2) model with time varying coefficients and GARCH type errors. We find varying levels of efficiency and varying speeds of movement towards efficiency within our sample of four shares.  相似文献   
26.
27.
28.
The Tax Reform Act of 1986 rewrote the federal income tax code, bringing it closer to policy professionals' vision of what constitutes an equitable and efficient income tax. Research on tax compliance suggests the law might have affected taxpayer compliance in three ways: by reducing opportunities to overstate deductions, by changing perceptions of fairness, and by altering tax liabilities. Changes in taxpayer perceptions, attitudes, and noncompliance intentions were examined in three bodies of survey data, each containing pre-and post-reform data from independent samples of the same population. The results show an improved normative climate for taxpayer compliance and point to both the feasibility and the importance of examining the effects of substantive tax policies on taxpayer perceptions, attitudes, and behavioral intentions.  相似文献   
29.
The formation of adequate mental health systems within prisons has accelerated as a result of successful class action lawsuits. Our recent national survey questioned all state correctional departments about the existence of standards in each system, compliance with such standards, prevalence of class action lawsuits involving the issue of providing adequate mental health services for inmates, issues related to consent decrees, available mental health resources within the correctional system, and the administrative structure of the mental health system. Our purpose was to identify those factors correlated with certified class action lawsuits involving issues related to mental health services. Twenty-one states were involved in such litigation. Only the presence of psychiatric hospitals operated by the department of corrections correlated with the presence of certified class action lawsuits involving mental health services. Prison systems larger than 15,000 inmates were at higher risk for such litigation. Smaller systems having psychiatric hospitals run by the state mental health agency appeared to be at less risk for such litigation.  相似文献   
30.
The Green River Murder Investigation in King County, Washington, is currently the longest active serial murder investigation in U.S. history. During its course, over 26 separate scenes with from one to five victims each have been processed. The experience of the authors is presented in order to acquaint other agencies with techniques of outdoor scene processing that have evolved during recovery of remains from Green River and other skeletal cases.  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