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   1628篇
  免费   9篇
各国政治   108篇
工人农民   40篇
世界政治   91篇
外交国际关系   78篇
法律   1025篇
中国共产党   2篇
中国政治   24篇
政治理论   258篇
综合类   11篇
  2024年   3篇
  2023年   4篇
  2022年   6篇
  2021年   3篇
  2020年   6篇
  2019年   8篇
  2018年   21篇
  2017年   12篇
  2016年   21篇
  2015年   59篇
  2014年   57篇
  2013年   304篇
  2012年   86篇
  2011年   73篇
  2010年   88篇
  2009年   84篇
  2008年   73篇
  2007年   84篇
  2006年   85篇
  2005年   83篇
  2004年   62篇
  2003年   20篇
  2002年   37篇
  2001年   92篇
  2000年   12篇
  1999年   17篇
  1998年   10篇
  1997年   10篇
  1996年   10篇
  1995年   9篇
  1994年   9篇
  1993年   8篇
  1992年   16篇
  1991年   5篇
  1990年   5篇
  1989年   15篇
  1988年   6篇
  1987年   12篇
  1986年   15篇
  1985年   11篇
  1984年   10篇
  1983年   4篇
  1982年   14篇
  1981年   9篇
  1980年   10篇
  1979年   11篇
  1978年   10篇
  1977年   10篇
  1975年   4篇
  1967年   4篇
排序方式: 共有1637条查询结果,搜索用时 15 毫秒
931.
932.
933.
    
Latent fingerprints were successfully visualized using fluorescence lifetime imaging (FLIM) on paper which emits strong fluorescence with a lifetime close to that of fingerprints and thus from which it is difficult for time-resolved spectroscopy to visualize fingerprints. Latent fingerprint samples on paper were excited using a 450 nm or 532 nm nanosecond pulsed-laser, and time-resolved fluorescence images were obtained at a delay time of 6–16 ns in intervals of 1 ns, to the excitation pulse. The excitation beam was expanded using a lens, and the fluorescence from the fingerprints was captured using an intensified CCD camera. Because of the large fluorescence intensity of the background paper of approximately two to four orders of magnitude larger than that of the fingerprint, the fingerprint was not visualized on each fluorescence image by time-resolved spectroscopy. However, the fingerprint was visualized in a FLIM image constructed using a series of the fluorescence images for the case with the fluorescence intensity of the background paper being four orders of magnitude larger than that of the fingerprint. The difference in fluorescence lifetime in the FLIM image of the visualized fingerprint and background paper was in the order of 0.1 ns, which was an order of magnitude smaller than the inherent fluorescence lifetime of a few nanoseconds for the fingerprints and paper. It was demonstrated that, at a background fluorescence intensity with a certain order of magnitude larger than that of fingerprints, FLIM has the potential to visualize latent fingerprints which cannot be visualized by time-resolved spectroscopy.  相似文献   
934.
    
Sexual assault evidence samples require the use of a specific process known as a differential digestion to separate sperm from nonsperm cells prior to DNA extraction. An automated differential digestion process was developed using a selective degradation technique, which uses DNase I to digest the remaining nonsperm DNA in the sperm fraction. The use of DNase on pristine samples, as well as aged and degraded samples, was assessed to ensure that the quantity and quality of the sperm DNA were not compromised or adversely affected. Samples processed using the selective degradation technique yielded comparable DNA yield and DNA typing data to the conventional differential digestion process. The automated process utilized 96‐well plates for high throughput and incorporated microscope slide preparations for confirmation of sperm. It reduced processing time by about sixfold and was paramount in the elimination of the Oakland Police Department Criminalistics Laboratory's sexual assault kit backlog.  相似文献   
935.
    
This study identified factors that influenced California nonprofit housing development organizations’ (NHDO) survival and financial stability during the Great Recession. NHDO typically develop and manage affordable housing, while providing social services. During the recession, NHDO financial issues were exacerbated and compounded by the elimination of state redevelopment funds. This research tested organizational theories through bivariate and multivariate analyses from Internal Revenue Service 990 tax forms for nearly 800 NHDO. In many ways, the factors that influenced NHDO sustainability and performance were similar to those affecting for-profits and other nonprofits. For example, older and larger organizations with more staff and revenue fared better. Other factors were unique to this sector (e.g., the region and type of housing developed affected outcomes). An important finding was that reliance on government funding was negatively associated with survival and revenue. The lessons learned from NHDO inform other organizations about surviving and thriving during tough economic times.  相似文献   
936.
    
This article, after deliberating on utility of performance evaluation (PE) for the judiciary and practices developed in different jurisdictions for PE, examines existing rules on PE of magistrates in India. From these rules, effectiveness and utility of criteria formulated for PE of magistrates by different high courts is mapped to show their shortcomings, and suggestions are provided for improvement. The article relies on the results of a survey among 35 senior district judges to understand how evaluators see their role in the PE. In the end, some suggestions are offered for reforming the existing system of PE – like delinking it from annual confidential reports, establishing independent commission for PE, adopting transparency in PE, widening gap between two evaluations and making PE as a deciding factor for upward career mobility of magistrates.  相似文献   
937.
938.
939.
    
  相似文献   
940.
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