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   3613篇
  免费   171篇
各国政治   218篇
工人农民   100篇
世界政治   366篇
外交国际关系   263篇
法律   1492篇
中国共产党   2篇
中国政治   37篇
政治理论   1263篇
综合类   43篇
  2021年   29篇
  2020年   45篇
  2019年   71篇
  2018年   107篇
  2017年   118篇
  2016年   113篇
  2015年   78篇
  2014年   94篇
  2013年   616篇
  2012年   77篇
  2011年   106篇
  2010年   96篇
  2009年   113篇
  2008年   104篇
  2007年   102篇
  2006年   109篇
  2005年   116篇
  2004年   105篇
  2003年   96篇
  2002年   120篇
  2001年   76篇
  2000年   78篇
  1999年   67篇
  1998年   60篇
  1997年   63篇
  1996年   39篇
  1995年   51篇
  1994年   58篇
  1993年   52篇
  1992年   41篇
  1991年   53篇
  1990年   35篇
  1989年   50篇
  1988年   29篇
  1987年   36篇
  1986年   40篇
  1985年   41篇
  1984年   32篇
  1983年   43篇
  1982年   41篇
  1981年   50篇
  1980年   36篇
  1979年   39篇
  1978年   35篇
  1977年   19篇
  1976年   32篇
  1975年   17篇
  1974年   20篇
  1973年   21篇
  1969年   17篇
排序方式: 共有3784条查询结果,搜索用时 31 毫秒
941.
People with severe mental illness evidence significantly higher rates of HIV infection than the general population in the United States. Frequently, the only access to health care for this population is through their outpatient mental health care providers. In order to determine how these providers were dealing with the increased risk of HIV infection among this group, a survey of all licensed and certified outpatient mental health care centers in New York State was conducted. The data were compared to a similar previous survey conducted in 1997.  相似文献   
942.
943.
This article studies gubernatorial midterm slumps in U.S. state legislative elections. We employ a regression discontinuity design, which allows us to rule out the hypothesis that the midterm slump simply reflects a type of “reversion to the mean” generated by simple partisan swings or the withdrawal of gubernatorial coattails or “anticipatory balancing.” Our results show that the party of the governor experiences an average seat‐share loss of about 3.5 percentage points. We also find evidence suggesting that a large share of the variation in gubernatorial midterm slumps can be accounted for by (1) crude partisan balancing and (2) referendums on state economic performance, with approximately equal weight given to each.  相似文献   
944.
945.
The purpose of this study was to identify common factors in false allegation adult crimes, by examining the dynamics involved in 30 confirmed false allegation cases. The authors conducted a comprehensive review of these adjudicated cases and then completed a collection instrument to capture offender demographics, offense characteristics, and motive. The results indicated that most false allegation crimes were committed by women (73.3%) and Caucasians (93.3%). Data indicated that more interpersonally violent allegations were primarily motivated by attention/sympathy needs (50.0%), whereas more impersonal offenses involved other motivations such as providing an alibi (16.7%) or profit (13.3%). Offenders tended to be younger, high school graduates with no higher education (43.3%). A total of 23.3% of offenders had a prior criminal history. Male offenders appeared as likely as women to be motivated by attention/sympathy; however, men tended to select more violent, nonsexual offenses (e.g., attempted murder) than women.  相似文献   
946.
The potential application of mRNA for the identification of biological fluids using molecular techniques has been a recent development in forensic serology. Constitutively expressed housekeeping genes can assess the amount of mRNA recovered from a sample, establish its suitability for downstream applications, and provide a reference point to corroborate the identity of the fluid. qPCR was utilized to compare the expression levels of housekeeping genes from forensic-like body fluid stains to establish the most appropriate assessment of human mRNA quantity prior to profiling. Although variability was observed between fluids and individuals, results indicated that beta-2 microglobulin exhibited the highest expression for all body fluids examined and across donors. A one-way analysis of variance was performed for housekeeping gene variability between donors (at the α, 0.05, significance level), and the results indicated significant differences for semen, vaginal secretions, and menstrual blood.  相似文献   
947.
The method of residue extraction through electrostatic lifting provides a distinctive mode of performing ultra-trace analysis. These lifts provide a medium for analyte extraction via nanomanipulation-coupled to nanospray ionization-mass spectrometry (NSI-MS). This method of extraction can be coupled to Raman spectroscopy for supplemental verification of analytes using surface enhanced Raman scattering (SERS). The gold surface used for SERS provides an enhanced effect on peak signal intensity allowing ultra-trace amounts to be detected more effectively. The aim of this research is to utilize gold-coated films with electrostatic lifting in order to collect latent materials and analyze chemicals of interest contained in them via SERS.  相似文献   
948.
In this paper we examine imaging research involving first-episode schizophrenic treatment-naive individuals (FESTNIs) through a legal human rights lens; in particular, the lens of the Additional Protocol to the Convention on Human Rights and Biomedicine Concerning Biomedical Research. We identify a number of ethical and legal hot spots highlighted by the Protocol, and offer a series of recommendations designed to ensure the human rights compatibility of this research. Subsequently, we argue that the lack of reporting on design elements related to ethical concerns frustrates commitments at the heart of the human rights approach, namely, transparency and openness to international scrutiny. To redress this problem, we introduce two norms for the first time: ethical transparency, and ethical reproducibility. When concluding, we offer a set of reporting guidelines designed to operationalize these norms in the context of imaging research involving FESTNIs. Though we will not make this case here, we believe that parallel reporting guidelines should be incorporated into other areas of research involving human subjects.  相似文献   
949.
This paper explores the visual representation of asylum seekers and refugees delineating how English newspaper imagery constructs such groups as deviant and dangerous. A qualitative visual analysis of nine of the major national newspapers demonstrates how mediated images of asylum seekers focus upon three distinct ‘visual scenarios’ in the discovery of deviance, which collectively demonstrate how the social portrayal of the criminal immigrant fuses the otherness of the stranger with the otherness of the deviant. First, the faceless and de-identified stranger enables the construction of a panoply of feared subjects. Second, stigma is implicitly illustrated, deviance obliquely intimated and ‘spoiled identities’ constructed. Third, the mask is removed, the asylum seeker is identified and their deviant status confirmed. Such a process is reinvented, repeated and reworked in news stories, with deviance becoming increasingly engrained and entrenched in the image of the asylum seeker. This paper details how the repetition of specific visual scenarios in newspaper reporting contribute to the construction of ‘noisy’ panics about asylum seekers and asylum seeking. Moreover, it argues that such imagery is key to the construction of asylum as an issue of security, which necessitates a policy approach that is exclusionary in nature.  相似文献   
950.
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