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   2079篇
  免费   527篇
各国政治   393篇
工人农民   111篇
世界政治   263篇
外交国际关系   104篇
法律   970篇
中国政治   45篇
政治理论   685篇
综合类   35篇
  2024年   1篇
  2023年   4篇
  2022年   5篇
  2021年   31篇
  2020年   50篇
  2019年   168篇
  2018年   115篇
  2017年   156篇
  2016年   169篇
  2015年   145篇
  2014年   146篇
  2013年   602篇
  2012年   109篇
  2011年   103篇
  2010年   121篇
  2009年   69篇
  2008年   92篇
  2007年   66篇
  2006年   58篇
  2005年   46篇
  2004年   43篇
  2003年   27篇
  2002年   33篇
  2001年   11篇
  2000年   18篇
  1999年   19篇
  1998年   14篇
  1997年   16篇
  1996年   15篇
  1995年   13篇
  1994年   16篇
  1993年   15篇
  1992年   13篇
  1991年   10篇
  1990年   9篇
  1989年   5篇
  1988年   9篇
  1987年   3篇
  1986年   6篇
  1985年   7篇
  1984年   9篇
  1983年   7篇
  1982年   2篇
  1981年   6篇
  1980年   8篇
  1979年   4篇
  1978年   5篇
  1977年   4篇
  1976年   1篇
  1974年   2篇
排序方式: 共有2606条查询结果,搜索用时 15 毫秒
991.
In the daily practice of forensic pathology, sudden cardiac death (SCD) is a diagnostic challenge. Our aim was to determine the usefulness of blood biomarkers [creatine kinase CK‐MB, myoglobin, troponins I and T (cTn‐I and T), and lactate dehydrogenase] measured by immunoassay technique, in the postmortem diagnosis of SCD. Two groups were compared, 20 corpses with SCD and 8 controls. Statistical significance was determined by variance analysis procedures, with a post hoc Tukey multiple range test for comparison of means (p < 0.05). SCD cases showed significantly higher levels (p < 0.05) of cTn‐T and cTn‐I compared to the control group. Although only cases within the first 8 h of postmortem interval were included, and the control group consisted mainly of violent death cases, our results suggest that blood troponin levels may be useful to support a diagnosis of SCD.  相似文献   
992.
993.
ABSTRACT

In response to the upsurge in acts of sexual violence against women in India, Parliament passed the Criminal Law (Amendment) Act of 2013, amending existing statutes and rules of evidence relating to crimes of sexual violence and the practices of forensic professionals in the country. While a step in the right direction, this law paid little attention to forensic evidence in sexual violence cases, which can provide a more objective, scientific account of events, aid in the reconstruction of crimes, and help strengthen cases against perpetrators. The objectives of this article are twofold: to raise awareness for the need for a more prominent role of forensic evidence in sexual violence cases and to recommend ways to establish uniform and comprehensive policies and procedures on the collection and preservation of forensic evidence in order to ensure that cases of sexual violence against women are heard in Indian courts.  相似文献   
994.
In recent years, pre-implantation genetic diagnosis (PGD) has been developed to enable the selection of a tissue type matched "saviour sibling" for a sick child. This article examines the current regulatory framework governing PGD in Australia. The availability of PGD in Australia to create a saviour sibling depends on the regulation of ART services by each State and Territory. The limitations on the use of PGD vary throughout Australia, according to the level of regulation of ART in each jurisdiction. This article considers the limitations on the use of PGD for tissue typing in Australia and argues that some of these should be removed for a more consistent national approach. In particular, the focus in ART legislation on the "paramount interests" of the child to be born is inappropriate for the application of tissue typing, which necessarily involves the interests of other family members.  相似文献   
995.
Debate over ‘loyalty transfer’ in the European Union (EU) centres on the assumption that elite socialisation and ‘spillover’ processes lead inevitably to changes in the behaviour and identities of European officials. This article interrogates that notion by exploring how officials in the EU external delegations represent Europe. The Lisbon Treaty (2009) will transform the delegations in ways that are emblematic of the EU's evolution as a global actor. Drawing on empirical insights we examine the way EU diplomats embody the European idea and understand their role in promoting ‘the European Union interests and values around the world’. At a moment of historic transition, the article highlights some of the cultural dynamics currently transforming European diplomacy and how officials conceptualize their work of ‘delivering EU external relations policy’. We argue that Europeanization and loyalty transfer are complicated by inter‐institutional rivalries that raise problematic questions over who can best claim to ‘speak for Europe’.  相似文献   
996.
997.
Abstract: An investigation is presented of the explosion of a CNG (compressed natural gas) fuel vessel, called a liner, in an urban bus. The explosion happened at a gas station 10 min after filling was completed. There were no traces of soot and flames at the failed liner, which would be indicative of explosion by ignition of the gas. The filling process of the station was automatically monitored and recorded in a computer. There was no unusual record of the filling system that indicated excess pressure at the time of the accident. There were cracks on the liner that were initiated at the outer surface of the cylindrical shell located at a point 4 cm above the lower dome where cracks did not originate easily as a result of overload. Chemical analysis was performed on a specimen that was cut from the liner, and there was no peculiarity in the mix. Mechanical analysis was performed on the specimens and showed that the hardness was not in the specified range because of inadequate heat treatment of the metal. The hardness of the liner was strictly controlled in the manufacturing process. All the liners that were manufactured at the same period with the failed liner were recalled for examination.  相似文献   
998.
999.
Abstract: A novel multiplex of independent dinucleotide tandem repeat (DTR) loci was previously described that is capable of not only discriminating human and equine DNA, but of identifying a single equine source. We report a case in which a bloodstained syringe and two needles were found during inspection of a barn by inspectors of the Pennsylvania Racing Commissions. Using the multiplex and single‐locus detection, all 21 equine DTR markers were detected in a suspect horse and two evidence samples, indicating the evidence samples came from the suspect animal. Only six markers were detected in the third evidence sample because the volume of blood was limited. Following whole‐genome amplification and single‐locus PCR, the third evidence sample detected a total of 17 markers and the likelihood of identity (probability from suspect horse/probability from a random pacer) was 7.0 × 106. The DTR multiplex has some technical limitations, but it is already practical for casework.  相似文献   
1000.
Abstract: Murder–suicide is a relatively uncommon event but as reported by the New York Times, it has occurred and continues to occur yearly. Previous research has indicated that those who commit murder–suicides tend to be men, are in or have been in an intimate relationship with the victim, victims tend to be women, and a firearm is most likely to be used. This study uses a newspaper surveillance methodology to examine such cases. Articles from the New York Times as found in the New York Times Index were coded, analyzed, and examined. The cases, 166 in total, support the findings from prior research. The trend data was examined by cross tabulations and chi‐square analysis. The findings suggest that murder–suicides are rare events and when they occur they usually involve a male perpetrator and an intimate partner victim who is either a wife or girlfriend with the event occurring in a private home. A firearm is the most commonly used method for both murders and suicides, particularly if there was more than one murder victim. The authors conclude by suggesting that future research should focus on using the forthcoming data resource in the CDC’s National Violent Death Reporting System (NVDRS) to examine the occurrence of murder–suicide.  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