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   72375篇
  免费   3313篇
各国政治   4687篇
工人农民   3004篇
世界政治   6205篇
外交国际关系   3923篇
法律   35349篇
中国共产党   18篇
中国政治   763篇
政治理论   20797篇
综合类   942篇
  2021年   426篇
  2020年   1201篇
  2019年   1560篇
  2018年   1805篇
  2017年   2083篇
  2016年   2298篇
  2015年   1898篇
  2014年   2141篇
  2013年   10644篇
  2012年   1762篇
  2011年   1868篇
  2010年   1908篇
  2009年   2159篇
  2008年   1911篇
  2007年   1944篇
  2006年   2096篇
  2005年   1941篇
  2004年   1820篇
  2003年   1583篇
  2002年   1678篇
  2001年   1844篇
  2000年   1557篇
  1999年   1353篇
  1998年   1101篇
  1997年   944篇
  1996年   956篇
  1995年   955篇
  1994年   956篇
  1993年   977篇
  1992年   1057篇
  1991年   1082篇
  1990年   1031篇
  1989年   1051篇
  1988年   1054篇
  1987年   1042篇
  1986年   1077篇
  1985年   1123篇
  1984年   994篇
  1983年   1013篇
  1982年   905篇
  1981年   858篇
  1980年   675篇
  1979年   748篇
  1978年   604篇
  1977年   538篇
  1976年   489篇
  1975年   421篇
  1974年   449篇
  1973年   442篇
  1972年   382篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Natur und Recht - Angesichts der enormen Zerschneidungswirkung von Bundesfernstraßen werden Grünbrücken in der Bundesrepublik vermehrt errichtet, sodass sich die Frage der...  相似文献   
2.
Critical Criminology - The end of the crack-cocaine crisis and collapse of open-air urban drug markets over the last two decades have reshaped the contours of gang life and gang violence in the...  相似文献   
3.
Often, criminal acts involving a vehicle are caught on digital video surveillance systems. While potentially useful for an investigation, the recording conditions are typically less than optimal for the extraction of key information for the identification of the perpetrator, such as a license plate. Providing the make, model and year of a questioned vehicle is a common request for examiners, to narrow the field of potential suspect vehicles. This study seeks to compare the performance of a nonpeer-reviewed make, model, and year determination between two separate groups, specifically, trained forensic image examiners and nontrained individuals. Results show that even with varied image capture conditions and quality, the trained forensic image examiners more correctly and completely identified the test group of questioned vehicles make, model, and year.  相似文献   
4.
Public administration scholarship on race and gender is motivated by normative concerns about social equity, and dominated by work on bureaucracy and its representativeness. Despite decades of research on race and gender in public administration, there has been limited engagement with racializing and gendering processes. Relatedly, scant attention is paid to other disciplines that center on race and gender in theorizing. The purpose of this review is to explore public administration scholarship on race and gender in the context of allied social science disciplines, reveal limits of current approaches in public administration, and articulate strategies for enhancing understanding of race and gender in public administration scholarship. We use bibliometric and content analysis methods to map the intellectual structure of social science scholarship on race and gender, highlight public administration's place in this structure, and compare public administration scholarship on race and gender with other social science disciplines.  相似文献   
5.
This research demonstrates the value of laser scanning confocal microscopy (LSCM) as a research tool in osteological studies, and diagenetic studies in particular. LSCM combines properties of light and scanning electron microscopy using laser light to excite fluorophores throughout the z-axis, developing a 3-D image. Using differential staining and selecting for specific wavelengths of light, one can image targeted materials. This research is divided into two parts: visualizing bone structures such as proteins and their decompositional products and visualizing diagenesis. Part one of this study utilized pig bones as a means of testing the overall ability of LSCM to fluoresce bone. Twenty-three samples were imaged, including 13 samples from a decompositional study conducted 5 years previous, and 10 “fresh” samples collected from a commercial butcher. This part of the study determined that protein and organic components of the bone could be fluoresced and diagenetic alteration could be imaged. The second part of the study used human samples as a means of imaging and mapping diagenetic alterations. The second part of the study used 13 samples, including 4 clinical, 7 ancient, and 2 modern controls. The pig study used Basic Fuchsin and SlowFade Gold stains, while the human study used toluidine blue. Images were also taken with unstained elements. The results of the non-human study found that a fresh bone fluoresced differently than that of a 5-year subset, while the results of the human study confirmed these findings and determined that the bone diagenesis can be mapped using LSCM.  相似文献   
6.
7.
Natur und Recht - In den Schutzgebieten des europäischen Netzes Natura 2000 (Vogelschutzgebiete und Flora-Fauna-Habitat-(FFH-)Gebiete) sind bestimmte natürliche Lebensräume sowie...  相似文献   
8.
Recent years have seen an increase in the use of delegated legislation to implement major policy decisions in the UK. This has exacerbated the longstanding criticism that Westminster lacks sufficiently robust procedures for parliamentary scrutiny of delegated legislation. However, the UK is not the only country to use delegated legislation, or to face the challenge of ensuring it receives adequate parliamentary scrutiny. This article therefore places the UK system in wider context by comparing it to six other national parliaments. We highlight one comparative strength of the UK system, two weaknesses it shares with the other six cases, and one way in which the UK might learn lessons from elsewhere. Overall, our evidence suggests that no one country offers a clear template for more rigorous parliamentary scrutiny of delegated legislation. Successful reform of the UK's system is likely to require creative procedural innovation.  相似文献   
9.
Kümper  Boas 《Natur und Recht》2022,44(2):77-87
Natur und Recht - Planfeststellung und Plangenehmigung sind etablierte Instrumente der Vorhabenzulassung und für den Gewässerausbau bereits seit langem auch im Wasserhaushaltsrecht...  相似文献   
10.
In the 1980s, governments around the world adopted New Public Management ideas about inserting competition into government as a way to improve the performance of public organizations. In many nations, contracting out was one method of making governments more businesslike. Yet, there have been few studies of how government contracting behaviors have changed since the early 1980s. We replicate Ferris and Graddy's classic 1986 study of local government production and sector choice to assess how public procurement has changed over the past 35 years. Our findings show that today, contracting out is more commonly used across 25 local government service areas. In contrast to the original study, much of the growth has been in government-to-government contracts. For profit firms are also winning more contracts for high transaction cost work, while nonprofits are receiving fewer government contracts in nearly every service area. Our analysis suggests that contracting out remains of the highest importance in 21st-century governance and that additional research is needed on how to manage contracts to achieve the best value.  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