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   1840篇
  免费   97篇
各国政治   154篇
工人农民   111篇
世界政治   276篇
外交国际关系   133篇
法律   913篇
中国共产党   1篇
中国政治   6篇
政治理论   340篇
综合类   3篇
  2023年   24篇
  2022年   13篇
  2021年   38篇
  2020年   67篇
  2019年   69篇
  2018年   108篇
  2017年   111篇
  2016年   92篇
  2015年   58篇
  2014年   92篇
  2013年   350篇
  2012年   75篇
  2011年   73篇
  2010年   41篇
  2009年   41篇
  2008年   53篇
  2007年   58篇
  2006年   47篇
  2005年   49篇
  2004年   51篇
  2003年   49篇
  2002年   41篇
  2001年   39篇
  2000年   38篇
  1999年   18篇
  1998年   19篇
  1997年   12篇
  1996年   11篇
  1995年   9篇
  1994年   23篇
  1993年   11篇
  1992年   10篇
  1991年   8篇
  1990年   10篇
  1989年   10篇
  1988年   7篇
  1987年   12篇
  1985年   5篇
  1984年   5篇
  1982年   9篇
  1980年   6篇
  1979年   11篇
  1978年   7篇
  1977年   4篇
  1973年   9篇
  1972年   3篇
  1971年   8篇
  1967年   4篇
  1965年   4篇
  1963年   3篇
排序方式: 共有1937条查询结果,搜索用时 15 毫秒
121.
Weight force during prone restraint and respiratory function   总被引:1,自引:0,他引:1  
Prone maximal restraint position (PMRP, also known as hogtie or hobble) is often used by law enforcement and prehospital personnel on violent combative individuals in the field setting. Weight force is often applied to the restrained individual's back and torso during the restraint process. We sought to determine the effect of 25 and 50 lbs weight force on respiratory function in human subject volunteers placed in the PMRP. We performed a randomized, cross-over, controlled trial on 10 subjects placed in 4 positions for 5 minutes each: sitting, PRMP, PRMP with 25 lbs weight force (PMRP+25), and PRMP with 50 lbs weight force placed on the back (PMRP+50). We measure pulse oximetry, end-tidal CO2 levels, and forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV1). FVC and FEV1 were significantly lower in all restraint positions compared with sitting but not significantly different between restraint positions with and without weight force. Moreover, mean oxygen saturation levels were above 95% and mean end-tidal CO2 levels were below 45 mm Hg for all positions. We conclude that PMRP with and without 25 and 50 lbs of weight force resulted in a restrictive pulmonary function pattern but no evidence of hypoxia or hypoventilation.  相似文献   
122.
Allele frequencies for 16 short tandem repeats (STR) loci were determined with a sample of 230-300 unrelated individuals from the population of Rio de Janeiro, Brazil. The loci are the most commonly used in forensic and paternity testing, being analysed by the Identifiler (Applied Biosystems) and PowerPlex 2.1 (Promega) commercial kits. It was proved that Penta E and D18S51 are the most polymorphic loci.  相似文献   
123.
Genotype polymorphism studies at the 13 loci STRs included in the combined DNA index system [CODIS and PCR-based short tandem repeat loci, in: Proceedings of the Second European Symposium on Human Identification, Promega Corporation, Madison, WI, 1998, pp. 73-88; J. Forensic Sci. 46 (2001) 453] (CODIS: D3S1358, HUMvWA31, HUMFGA, D8S1179 D21S11, D18S51, D5S818, D13S317, D7S820, HUMTH01, HUMTPOX, HUMCSF1PO and D16S539) were carried out in a sample of 1429 unrelated Colombian individuals belonging to 25 different departments. As many other countries in Latino-America, Colombia shows an important admixture component, basically integrated by Amerindians, European-descendants and African-descendants. Due to the fact that only partial population analyses have been carried out in the country, the main aim of the present analysis is to establish a database of forensic interest based on the widely used CODIS systems covering the main Colombian regions.  相似文献   
124.
Three hundred and twenty-six to four hundred and fifty-one individuals were typed for 12 STR markers and revealed by silver stain method and assisted by a computer analysis. Forensic and Hardy-Weinberg values were found. The Kodak ds 1D Image Analysis Software V 2.0.3 EDAS DC 120 System was a useful tool for determining the correct size of pattern bands that were out allelic ladders, alleles 18 and 17 from F13A01, 15 from TPOX and 4 from TH01 were determined by this method and some corroborated by automatic analysis.  相似文献   
125.
Allele frequencies for 09 STR autosomal loci (D3S1358, D5S818, D7S820, D8S1179, D13S317, D18S51, D21S11, FGA and VWA) included in the AmpFlSTR Profiler Plus were obtained from a sample of unrelated individuals from Rio Grande do Sul (southern Brazil).  相似文献   
126.
This paper reviews the role of internal European Union (EU) policies and measures in implementing the target for greenhouse gas mitigation in the Kyoto Protocol. It starts with a discussion of the EU Burden Sharing Agreement, which distributes the target between Member States. This leads to a review of the appropriate level of implementation of policies, i.e. at the EU level or Member State level. There is a role for the flexible mechanisms of the Protocol, particularly emission permit trading, in complementing Member State policies at the EU level. The implementation is to be done against the background of three major factors which may have an important bearing on the policies: the probable long-term requirement of substantial reductions in greenhouse gas emissions a changing structure of energy markets, following liberalisation of the gas and electricity markets EU enlargement to include economies in transition with the potential for further substantial reductions in emissions.The paper concludes with a discussion of ancillary benefits of the policies that may be substantial and a summary of the position as regards the "unfinished business" of the Protocol to be discussed at the Conference of the Parties in the Hague in November 2000.  相似文献   
127.
Diabetes mellitus is a chronic metabolic illness responsible for a great number of deaths. In postmortem diagnosis, because of the difficulty involved in interpreting blood glucose levels and relatively nonspecific pathologic features, biochemical markers in vitreous humor are useful. The aim of this study was to compare the results obtained for the combined determination of lactate and glucose with fructosamine levels recorded in the vitreous humor of two diagnostic groups (one diabetic and the other nondiabetic). The authors intended to ascertain the capacity of different markers measured in vitreous humor to diagnose diabetes mellitus. Fifty-one cadavers (mean age, 58.7 years; standard deviation, 17.09) were studied. The mean postmortem interval was 16.4 hours (standard deviation, 9.05). Cases were assigned to two diagnostic groups according to whether they were previously diagnosed as either diabetic or nondiabetic. Statistically significant differences for glucose, fructosamine, and the sum values of glucose and lactate were found between the two diagnostic groups. The highest levels were obtained in the group of cases with a previous diagnosis of diabetes mellitus. After the comparison of receiver operating characteristic curves, the sum values of glucose and lactate in vitreous humor is a better predictor of antemortem diabetes mellitus than the fructosamine.  相似文献   
128.
The use of the LightCycler for the detection of Y chromosome SNPs   总被引:3,自引:0,他引:3  
A novel methodology based on PCR monitoring on-line with fluorescent formats using the LightCycler for Y chromosome SNP typing is proposed. The main advantages of the system are the time necessary for the analysis (which is around 20 min), the robustness and the accuracy of the method and especially its sensitivity, which permits the detection of the male component in male-female mixtures up to 1:300 for some of the SNPs.Singleplexes of four different SNPs (M9, sY81, SRY-1532 and SRY-2627) as well as two duplexes (M9 and sY81 on the one hand and SRY-1532 and SRY-2627 on the other) were efficiently implemented. A simultaneous amplification and analysis of the four SNPs is also possible. It seems difficult with the current methodology to implement more than a quadruplex.  相似文献   
129.
130.
The authors trace and compare the developments in recorded juvenile delinquency in Hamburg, Prague, Cracow and Budapest from 1991-1997 and then analyse the processing and selection procedures of the various justice systems. They devote special attention to ethnic minorities within this filtering process. The most salient feature is that the crime rates and processing structures in the former socialist countries display considerable similarities. It would almost be possible to speak of a specific type of criminal justice system with a typical form of reaction. While in the West, the large number of suspects is considerably reduced during later stages of selection to a much smaller number (those actually sentenced and/or imprisoned), what the authors call a funnel model, in the East a smaller number of suspected offenders enters this selection process, but tends to remain within it and be sentenced - the cylinder model. These procedural structures have changed little in the 1990s, and there has certainly not been any increasing alignment of the Eastern systems with the Western one. Indeed, the difference has, if anything, become greater. These lower crime statistics as compared with the West - represented here by Hamburg - are, however, not only the result of equally large discrepancies between the real crime rates, but in this regard the pro-active crime prevention measures of the police, which in Hamburg have caused the inclusion of an increased number of juveniles and foreigners in the crime statistics since 1995, have also had a great effect. The research project thus clearly demonstrates the importance of interpreting crime statistics neither as a true representation nor as a distorted reflection of the activities of a criminal justice system. Instead, these statistics should be seen as reflecting specific processing procedures and methods of crime control.  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