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   4907篇
  免费   213篇
各国政治   263篇
工人农民   168篇
世界政治   490篇
外交国际关系   272篇
法律   2183篇
中国政治   26篇
政治理论   1663篇
综合类   55篇
  2021年   29篇
  2020年   59篇
  2019年   71篇
  2018年   117篇
  2017年   143篇
  2016年   173篇
  2015年   106篇
  2014年   113篇
  2013年   755篇
  2012年   140篇
  2011年   126篇
  2010年   130篇
  2009年   138篇
  2008年   138篇
  2007年   163篇
  2006年   155篇
  2005年   143篇
  2004年   140篇
  2003年   135篇
  2002年   128篇
  2001年   81篇
  2000年   106篇
  1999年   82篇
  1998年   105篇
  1997年   84篇
  1996年   50篇
  1995年   81篇
  1994年   75篇
  1993年   76篇
  1992年   76篇
  1991年   66篇
  1990年   62篇
  1989年   75篇
  1988年   72篇
  1987年   78篇
  1986年   67篇
  1985年   84篇
  1984年   72篇
  1983年   59篇
  1982年   63篇
  1981年   63篇
  1980年   50篇
  1979年   49篇
  1978年   41篇
  1977年   40篇
  1976年   32篇
  1975年   24篇
  1974年   24篇
  1973年   28篇
  1969年   22篇
排序方式: 共有5120条查询结果,搜索用时 15 毫秒
941.
The operation of a motor vehicle requires the integrity of sensory, motor, and intellectual faculties. Impairment of these faculties following the consumption of alcohol has been studied extensively through laboratory, closed‐course and on‐road driving, and epidemiological studies. The scientific literature was reviewed critically, with a focus on low‐to‐moderate blood alcohol concentrations (BAC ≤ 0.100%), to identify the most reliable determinants of alcohol‐impaired driving. Variables such as age, gender, driving skill, and tolerance were shown to have limited impact on impairment. It was concluded the most relevant variables are BAC and complexity of the driving task. The scientific literature provides a high degree of confidence to support the conclusion that a BAC of 0.050% impairs faculties required in the operation of a motor vehicle. Whether impairment is apparent depends upon the complexity of the driving task, which applies to both study design and actual driving.  相似文献   
942.
The business improvement district (BID) is a popular economic development and urban revitalization model in which local property and business owners must pay an assessment tax that funds supplementary services, including private security. BIDs constitute a controversial form of urban revitalization to some because they privatize economic development and public safety efforts in public space. This study examines whether BIDs provide tangible benefits beyond their immediate boundaries to local residents in the form of reduced violence among adolescents. The empirical analysis advances an existing literature dominated by evaluation studies by introducing a theoretically driven dataset with rich information on individual and neighborhood level variables. The analysis compares violent victimization among youths living in BID neighborhoods with those in similarly situated non‐BID neighborhoods. We find no effect of BIDs on violence. However, we do find that youth violence is strongly correlated with neighborhood collective efficacy and family‐related attributes of social control. In conclusion, we argue that BIDs may be an agent of crime reduction, but this benefit is likely concentrated only in their immediate boundaries and does not extend to youths living in surrounding neighborhoods.  相似文献   
943.
The stability of two benzisoxazole antipsychotics was determined in vitro in decomposing porcine blood inoculated with bacteria, utilizing a high‐performance liquid chromatography with ultraviolet and fluorescence detection method for drug quantitation. Stability experiments for risperidone and paliperidone were conducted at 7, 20 and 37°C for 4 days using sterile and bacterially inoculated porcine blood. The drugs were stable in sterile blood at each temperature and in inoculated blood at 7°C, but degraded significantly in inoculated blood at 20 and 37°C. Complete loss occurred within 2 days when incubated at 37°C. The benzisoxazole‐cleaved degradation products for both drugs were identified as 2‐hydroxybenzoyl‐risperidone and 2‐hydroxybenzoyl‐paliperidone utilizing liquid chromatography quadrupole‐time‐of‐flight mass spectrometry and accurate mass measurements. The degradation products have been found in postmortem case studies, including one case where risperidone and paliperidone were not detected, indicating complete conversion can occur in situ.  相似文献   
944.
This paper describes a method for determining the density of contact trace objects with magnetic levitation (MagLev). MagLev measurements accurately determine the density (±0.0002 g/cm3) of a diamagnetic object and are compatible with objects that are nonuniform in shape and size. The MagLev device (composed of two permanent magnets with like poles facing) and the method described provide a means of accurately determining the density of trace objects. This method is inexpensive, rapid, and verifiable and provides numerical values—independent of the specific apparatus or analyst—that correspond to the absolute density of the sample that may be entered into a searchable database. We discuss the feasibility of MagLev as a possible means of characterizing forensic‐related evidence and demonstrate the ability of MagLev to (i) determine the density of samples of glitter and gunpowder, (ii) separate glitter particles of different densities, and (iii) determine the density of a glitter sample that was removed from a complex sample matrix.  相似文献   
945.
This study, which includes a comparison of American experience, focuses on women policing in India. Using a standardized survey questionnaire, data were collected from women officers on line duty in all district police departments in the State of Tamil Nadu, India, and in municipal and sheriff's departments in New Jersey. A discriminant analysis found important differences between the samples in the officer's preferred roles, with more of the officers from Tamil Nadu preferring a traditional role. Other differences were also found between the samples in terms of deployment experience, career commitment, perceived interests and perceived capability in performing various tasks compared with male officers. These differences appeared to be due to both organizational and cultural factors.  相似文献   
946.
The subject of fear of crime has generated a substantial body of empirical study within Western industrialized society. However, the current focus on comparative criminology inspires efforts to study fear of crime cross culturally. This study attempts to assess some of the widely accepted predictors and conclusions of fear of crime found in developed nations on the urbanized capital city of Botswana. More specifically, in this article, the author explores the relationships between gender, victimization, incivility, and fear of crime in Gaborone, Botswana. Findings suggest that gender, victimization, and, in part, the environment are all useful in explaining fear of crime in Gaborne. However, it appears that gender, more than victimization and incivility, is itself a genuinely powerful determinant of fear of crime.  相似文献   
947.
Pressure in the 1970's to reform the sentencing process can be attributed to a change in perceived public sentiment regarding the utility of treatment and to the belief that sentencing disparity was a severe problem in the sentencing process. Primary reform occurred in the federal judicial system with the development and implementation of rigorous sentencing guidelines. An evaluation of sentencing patterns for one federal judicial district indicates that sentencing disparity was not severe. Most federal offenders are relatively mild and consistently receive relatively mild sentences.  相似文献   
948.
949.
Levels of citizen estrangement from government in the United States have risen rather consistently since the late 1960s and have reached all‐time highs in recent years. Evidence is accumulating in political science research to suggest that public administrative theory may have contributed to this trend since the Progressive Era in the early 1900s. The authors develop this thesis by arguing that administrative theory in the United States has persistently portrayed public managers as “bridge builders” who link an expertise‐challenged citizenry to government in ways that emphasize bureaucratic over democratic administration. Moreover, despite claims of yet another “new” paradigmatic shift for the field, collaborative governance scholarship to date exhibits similar tendencies. To support this argument, the authors assess the common citizen‐marginalizing tendencies of three sets of administrative reforms in American public administration: the progressive, associationalist, and polycentric heritages. They offer counterarguments to this thesis and call for critical self‐reflection by the field and a more empirically robust research agenda on this topic.  相似文献   
950.
Existing research on public opinion related to race and immigration politics emphasizes the role of prejudice or bias against minority groups. We argue that the social norm against prejudice, and individual motivations to comply with it, are crucial elements omitted from prior analyses. In contemporary Western societies, most citizens receive strong signals that prejudice is not normatively acceptable. We demonstrate that many majority‐group individuals have internalized a motivation to control prejudiced thoughts and actions and that this motivation influences their political behavior in predictable ways. We introduce measures capturing this motivation, develop hypotheses about its influence, and test these hypotheses in three separate experimental and nonexperimental survey studies conducted in Britain and Germany. Our findings support a dual‐process model of political behavior suggesting that while many voters harbor negative stereotypes, they also—particularly when certain contextual signals are present—strive to act in accordance with the “better angels of their natures.”  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