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   9936篇
  免费   343篇
各国政治   672篇
工人农民   384篇
世界政治   783篇
外交国际关系   457篇
法律   5606篇
中国共产党   2篇
中国政治   144篇
政治理论   2136篇
综合类   95篇
  2020年   130篇
  2019年   154篇
  2018年   218篇
  2017年   245篇
  2016年   247篇
  2015年   208篇
  2014年   215篇
  2013年   1252篇
  2012年   252篇
  2011年   341篇
  2010年   251篇
  2009年   274篇
  2008年   267篇
  2007年   255篇
  2006年   258篇
  2005年   228篇
  2004年   248篇
  2003年   266篇
  2002年   194篇
  2001年   379篇
  2000年   343篇
  1999年   313篇
  1998年   169篇
  1997年   114篇
  1996年   126篇
  1995年   110篇
  1994年   120篇
  1993年   113篇
  1992年   182篇
  1991年   171篇
  1990年   155篇
  1989年   145篇
  1988年   174篇
  1987年   171篇
  1986年   181篇
  1985年   159篇
  1984年   153篇
  1983年   163篇
  1982年   104篇
  1981年   73篇
  1980年   86篇
  1979年   107篇
  1978年   83篇
  1977年   76篇
  1976年   74篇
  1975年   62篇
  1974年   55篇
  1972年   54篇
  1971年   55篇
  1969年   55篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
981.
982.
The Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) imposes liability well beyond general corporate successor rules. A company can allocate liability to other Potentially Responsible Parties as more culpable, taking advantage of CERCLA's joint and several liability. Often a source of recovery must be teased from a complex corporate history somehow connected to the site. This article examines the basis for attributing environmental liability to entities within a corporate history, before addressing how even a bankrupt or dissolved target may still have insurance that can be tapped. Similarly, CERCLA's strict liability enables recovery from insurance with some connection to either the target's or the company's corporate history, notwithstanding insurers' non-assignment arguments.  相似文献   
983.
984.
985.
986.
In their seminal “Broken Windows” article in Atlantic Monthly, J. Q. Wilson and G. L. Kelling (1982) suggested that police could more effectively fight crime by targeting minor offenses. They hypothesized that untended disorder increases fear of crime in a community, starting a chain of events that eventually leads to heightened levels of crime. By targeting disorder, police can thus circumvent this cycle of neighborhood decline (Skogan, 1990). This study aimed to improve knowledge of the relationship between disorder and fear of crime in the context of the broken windows hypothesis by using a micro-place level research design involving a police crackdown on disorder and minor crime at hot spots. The results of the current study suggest that perceived social disorder and observed levels of physical disorder have a strong impact on fear of crime. This confirms the relationship between disorder and fear hypothesized by the broken windows literature, and implies that police may be able to reduce fear of crime by reducing disorder. It was also found, however, that the police intervention itself significantly increased the probability of feeling unsafe. Accordingly, any fear reduction benefits gained by reducing disorder may be offset by the fact that the policing strategies employed simultaneously increase fear of crime. These findings suggest the importance of a careful focus on “how” broken windows policing programs are implemented. Such programs must be geared not only to reduce disorder, but also to prevent increases in citizen fear that accompany crackdowns and other intensive enforcement efforts associated with broken windows policing.  相似文献   
987.
Interpersonal violence within lesbian relationships is a significant yet understudied problem. Women attending a gay pride festival in Atlanta, GA, were asked to complete a survey concerning same-sex interpersonal violence. Women who reported being in a current or previous same-sex partner relationship were included in the analyses (N = 226). Factors that occurred in the context of interpersonal violence were investigated: substance use, HIV/STI risk behaviors, barriers to reporting abuse, and attitudes inhibiting seeking of social support. In addition, the survey assessed relationship-related power dynamics. Results of multivariate analyses support the hypotheses that power imbalance and inequality when making sex-related decisions within women’s same-sex relationships are associated with interpersonal violence. Further findings suggested that a combination of factors must be considered when dealing with and reducing the risk for violence in same-sex relationships.  相似文献   
988.
National Institute of Standards and Technology SRM 2372 human DNA quantitation standard has been produced to support the need for a human-specific DNA quantitation standard in forensic casework and calibration of new quantitative polymerase chain reaction (qPCR) assays. The conventional DNA concentration has been assigned with one of the U.S. National Reference UV/Visible Spectrophotometers, assuming an absorbance of 1.0 at 260 nm equals 50 ng/μL of double stranded DNA. In addition, an interlaboratory study has been conducted, to verify that the SRM 2372 materials perform well in currently used DNA quantitation assays by the forensic DNA community. Each unit of SRM 2372 consists of three well-characterized DNA extracts. Component A is a single-source human male material derived from blood. Component B is a multiple-source human female material derived from blood. Component C was purchased as a purified unsheared genomic human DNA (Sigma-Aldrich Co., St. Louis, MO) obtained as a lyophilized human genomic extract and has both male and female donors. SRM 2372 is intended to enable the comparison of DNA concentration measurements across time and place. Manufacturers can use SRM 2372 to validate the values assigned to their own reference materials. Individual forensic laboratories can use SRM 2372 to validate DNA quantitation methods and to verify the assigned concentration of in-house or commercial DNA calibration standards.  相似文献   
989.
990.
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