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   1923篇
  免费   470篇
各国政治   391篇
工人农民   62篇
世界政治   242篇
外交国际关系   108篇
法律   843篇
中国共产党   1篇
中国政治   39篇
政治理论   673篇
综合类   34篇
  2023年   1篇
  2022年   5篇
  2021年   30篇
  2020年   42篇
  2019年   163篇
  2018年   100篇
  2017年   152篇
  2016年   166篇
  2015年   138篇
  2014年   136篇
  2013年   563篇
  2012年   100篇
  2011年   105篇
  2010年   111篇
  2009年   50篇
  2008年   76篇
  2007年   43篇
  2006年   45篇
  2005年   30篇
  2004年   32篇
  2003年   22篇
  2002年   24篇
  2001年   15篇
  2000年   21篇
  1999年   17篇
  1998年   14篇
  1997年   14篇
  1996年   15篇
  1995年   14篇
  1994年   18篇
  1993年   16篇
  1992年   11篇
  1991年   8篇
  1990年   11篇
  1989年   8篇
  1988年   9篇
  1987年   5篇
  1986年   8篇
  1985年   5篇
  1984年   8篇
  1983年   9篇
  1982年   3篇
  1981年   6篇
  1980年   6篇
  1979年   4篇
  1978年   6篇
  1977年   4篇
  1976年   1篇
  1974年   2篇
  1969年   1篇
排序方式: 共有2393条查询结果,搜索用时 0 毫秒
21.
This paper questions whether development agencies and their staff, at whatever level (community-based organisations, national or international NGOs) are sufficiently clear about their own values and roles, and seeks to analyse tensions and dilemmas that arise when roles are confused. Clarity about the roles of the people and agencies involved is essential for the development of a valid global citizens' movement that can interconnect local and global problems and actors, and work towards sustainable solutions.  相似文献   
22.
23.
The forensic science community raised the need for improved evidence recognition, collection, and visualization analytical instrumentation for field and laboratory use. While the 3D optical techniques for imaging static objects have been extensively studied, there is still a major gap between current knowledge and collecting high‐quality footwear and tire impression evidence. Among optical means for 3D imaging, digital fringe projection (DFP) techniques reconstruct 3D shape from phase information, achieving camera‐pixel spatial resolution. This paper presents a high‐resolution 3D imaging technology using DFP techniques dedicated to footwear and tire impression capture. We developed fully automated software algorithms and a graphical user interface (GUI) that allow anyone without training to operate for high‐quality 3D data capture. We performed accuracy evaluations and comparisons comparing with the commercial high‐end 3D scanner and carried out qualitative tests for various impressions comparing with the current practices. Overall, our technology achieves similar levels of accuracy and resolution with a high‐end commercially available 3D scanner, while having the merits of being (1) more affordable; (2) much easier to operate; and (3) more robust. Compared with the current practice of casting, our technology demonstrates its superiority because it (1) is non‐destructive; (2) collects more evidence detail than casts, especially when an impression is fragile; (3) requires less time and money to collect each piece of evidence; and (4) results in a digital file that can easily be shared with other examiners.  相似文献   
24.
High‐throughput sequencing (HTS) of large panels of single nucleotide polymorphisms (SNPs) provides an alternative or complimentary approach to short tandem repeats (STRs) panels for the analysis of complex DNA mixture forensic samples. For STRs, methods to estimate individual contribution concentrations compare capillary electrophoresis peak heights, peak areas, or HTS allele read counts within a mixture. This article introduces three approaches (mean, median, and slope methods) for estimating individual DNA contributions to forensic mixtures for HTS/massively parallel sequencing (MPS) SNP panels. For SNPs, the major:minor allele ratios or counts, unique to each contributor, were compared to estimate contributor proportion within the mixture using the mean, median, and slope intercept for these alleles. The estimates for these three methods were typically within 5% of planned experimental contributions for defined mixtures.  相似文献   
25.
26.
27.
Although parental compliance with court orders in child welfare cases is key to achieving physical parent‐child reunification and successful case closure, little research has examined how parent‐child relationship‐focused rehabilitative services uniquely influence case outcomes. This project fills this gap by investigating links between court ordering of and parental participation in Child‐Parent Psychotherapy (CPP) with court outcomes. Data were obtained from court records of 448 court‐involved parents. Hierarchical regressions revealed that greater participation in CPP led to reunification and successful case closure but not faster case closure. Courtroom professionals should consider parent‐child relationship‐based therapies as tools for achieving child welfare goals.  相似文献   
28.
This article discusses from the perspective of democratic theory an innovative proposal for the selection of constitutional, supreme court, or federal judges that aims at combining the values of expertise and political independence. It consists in combining a certification process – selecting a pool of properly qualified candidates – with a random selection among this pool. We argue that such selection procedure would better respect the separation of powers and the specific legitimacy of courts, and we champion this two‐stage mechanism vis‐à‐vis other, more traditionally employed, selection procedures. We then deal with a diversity of objections to our proposal and conclude by taking stock of both its virtues and limitations.  相似文献   
29.
30.
International research collaboration (IRC) is associated with both positive and negative effects on the performance of research in emerging economies. While some authors claim that North–South collaborations improve scientific quality and visibility for Southern countries, others claim that it may entail the reorientation of research to comply with Northern agendas. South–South collaborations are thought to increase the focus on local affairs, therefore leading to a relatively small number of scientific international publications appearing in “high quality” journals. Research on the impact of IRC beyond publications in international journals has been neglected despite the importance of other products in knowledge creation. This research uses a broad range of scientific outputs to empirically assess such assumptions and explore the outcomes of IRC in Colombia. Results from multivariate regressions and nonparametric analyses show that, contrary to common assumptions, Colombian research teams collaborating with partners from the global South report higher scientific production, while those collaborating with Northern countries seem to contribute to local knowledge the most.  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