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   3640篇
  免费   558篇
各国政治   541篇
工人农民   172篇
世界政治   480篇
外交国际关系   222篇
法律   1771篇
中国政治   39篇
政治理论   939篇
综合类   34篇
  2023年   32篇
  2022年   21篇
  2021年   75篇
  2020年   111篇
  2019年   239篇
  2018年   216篇
  2017年   270篇
  2016年   263篇
  2015年   209篇
  2014年   219篇
  2013年   841篇
  2012年   174篇
  2011年   164篇
  2010年   146篇
  2009年   83篇
  2008年   138篇
  2007年   104篇
  2006年   101篇
  2005年   84篇
  2004年   89篇
  2003年   76篇
  2002年   68篇
  2001年   46篇
  2000年   61篇
  1999年   31篇
  1998年   23篇
  1997年   20篇
  1996年   18篇
  1995年   21篇
  1994年   23篇
  1993年   22篇
  1992年   17篇
  1991年   14篇
  1990年   14篇
  1989年   9篇
  1988年   16篇
  1987年   10篇
  1986年   8篇
  1985年   7篇
  1984年   12篇
  1983年   10篇
  1982年   6篇
  1981年   7篇
  1980年   10篇
  1979年   11篇
  1978年   11篇
  1977年   6篇
  1973年   9篇
  1971年   8篇
  1965年   4篇
排序方式: 共有4198条查询结果,搜索用时 15 毫秒
971.
Abstract:  The male‐specific Y‐chromosomal short tandem repeat (STR) is a useful tool in forensic casework. The Y haplotype comprised of 16 loci, which is amplified simultaneously by AmpFlSTR® YfilerTM PCR kit and provides strong exculpatory evidence in individual identification. We reported a rare Y‐STR profile with a null allele at the DYS448 locus and an off‐ladder allele at the DYS456 locus, when genotyping material from a vaginal swab in an alleged rape case. Sequence analysis revealed that the DYS448 null allele was a true type of null allele because of a total deletion of 11 upstream repeats and 9 bp of the N42 region, and there were numerous primer binding site mutations as well. The amplicon of the DYS456 locus was a small 92‐bp fragment that was off‐ladder, and sequencing analysis showed that there were only 10 repeats (AGAT)10. This Y chromosome haplotype that was comprised of two variations provided helpful evidence for personal identification.  相似文献   
972.
The aim of our study was to analyse several serum biochemical markers in order to evaluate the discriminant capacity of trace elements individually and jointly in drowning (seawater drowning and freshwater drowning) and their correlation with age, sex, postmortem interval, time in water and concentrations of the trace elements in the drowning medium. Sixty-seven cases of drowning (53 seawater drownings (SWD); 14 freshwater drownings (FWD) and 73 control cases (other asphyxias, n=44, and other causes of death, n=29) were selected according to the scene, cause and circumstances of death, together with autopsy findings. Serum strontium (Sr), magnesium (Mg), sodium (Na), chloride (Cl), calcium (Ca), iron (Fe), urea, creatinine (Cr) and cardiac Troponine T (cTn-T) were measured in the left ventricle (Lv), right ventricle (Rv) and peripheral blood. Lv-Rv differences for each marker and Sr, Mg, Na, Cl, Ca and Fe concentrations in the drowning medium were determinated. Mean concentrations of Sr, Cl and Mg in both ventricles and peripheral serum and Lv-Rv differences and Ca Lv and Na Rv were significantly higher in cases of drowning than for other causes of death. In SWD, Sr, Mg, Ca, Na and Cl were significantly higher in Lv than in Rv as a result of aspirating water. In contrast, haemodilution is evident from the significantly higher levels of Fe and urea in Rv than in Lv in cases of SWD, and from the higher Mg and Cr levels in Rv in FWD. In the case of SWD, serum levels of Sr are confirmed as the best parameter for diagnosis, although other trace elements may also be useful, such as the serum concentrations of Mg and Cl. In the case of FWD, the joint determination of Sr and other biochemical markers, especially Fe, may increase correct diagnosis.  相似文献   
973.
In recent years, both scientific and judicial sources have highlighted the need for more knowledge about minutiae variability, in order to improve their statistical application to fingerprint identification. In line with this trend toward improving our knowledge of this subject, the aim of the present study was to calculate the frequency with which 20 types of minutiae appeared in 2780 fingerprint impressions obtained from 278 individuals from two Argentinian population samples (100 individuals from Ramal and 178 from Puna-Quebrada). The different types of minutiae were located, identified, and quantified visually in two areas on the fingerprint, the inside and outside of a circle, the radius of which cut fifteen ridges perpendicularly, starting from the center cut of the axes defining the sectors. The non-equiprobability found in both population samples for the different minutiae types studied demonstrated that the evidential weight provided by these characteristics is not the same when applied in identification processes, whether used quantitatively (numerical standard) or qualitatively (holistic method). The results obtained for both populations were compared statistically with those published previously for a Spanish population sample, which had been collected using the same methodology. This comparison has enabled us to demonstrate, for the first time, the existence of significant differences between populations in minutiae frequencies, independently from the main pattern type.  相似文献   
974.
Purpose. The ideologically based view of intimate partner violence has traditionally influenced policy and practice in modern western nations and dominated cross‐national research and practice. This review considers the validity of the position statement of a British organization responsible for accrediting many male perpetrator programmes in the statutory, voluntary, and private sector as an example of this ideological influence. Method. The position statement, informed by the patriarchal view of partner violence, is evaluated using empirical evidence from various branches of the social sciences, including psychology, that have not been guided by the patriarchal view. Results. Overwhelming empirical evidence is presented, which refutes ideologically driven assumptions that have been put forward to guide current practice and evaluation of it. Conclusions. This review highlights the need to investigate intimate partner violence from a scientific and gender‐inclusive perspective. The implications for psychological practice are discussed.  相似文献   
975.
Enhanced cooperation was introduced in the Treaty of Amsterdam (1997). Despite a lot of academic ink being spilled, the instrument had, until recently, never been applied in practice. In June 2010, the Council reached consensus on authorising a group of Member States to pursue, in the framework of enhanced cooperation, common rules in the area of the law applicable to divorce. The present paper critically analyses this first precedent. For that purpose, the background to the policy area will be explored. Subsequently, the desirability of enhanced cooperation shall be assessed. Finally, the content of Rome III, and its effects upon Member States not participating in the initiative, will be analysed. The paper will attempt to formulate an answer to the question whether enhanced cooperation should be the new approach to harmonisation of family‐related Private International Law.  相似文献   
976.
Asia Europe Journal - This article analyses trade flows EU-ASEAN, focusing on export performance and technological intensity, covering the years 2004–2016. The aim of this paper is to analyse...  相似文献   
977.
The growth of the far right and election results in Brazil are often associated with national or large-scale events. The multi-level features of these developments, namely party competition at the sub-national level, are overlooked in the literature. This article argues that changes in the Brazilian national party system – those observed from Bolsonaro's election, mainly – are rooted in sub-national political dynamics. Through a comparative and longitudinal analysis of multi-level executive and legislative elections, we find that, although there are distinct patterns of competition between the national-sub-national and within-country levels, this difference is not evident in volatility.  相似文献   
978.
Performance management (PM) is a major administrative mechanism for assessing efficiency and effectiveness, and for exacting accountability from organizations and individuals. Many have argued, however, that using PM in such ways creates perverse incentives and may lead to undesirable behaviours, such as the obstruction of accurate performance measurement in an effort to avoid public mortification. By examining the introduction of standardized testing in the Ontario public school system, this article adds to the debate on whether PM leads to undesirable behaviours and distorts the representation of actual performance by public sector employees. It argues that, while PM in the public sector may be well intentioned, it may generate a system that produces undesired results.  相似文献   
979.
980.
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