全文获取类型
收费全文 | 11236篇 |
免费 | 289篇 |
专业分类
各国政治 | 421篇 |
工人农民 | 398篇 |
世界政治 | 754篇 |
外交国际关系 | 316篇 |
法律 | 7022篇 |
中国政治 | 75篇 |
政治理论 | 2433篇 |
综合类 | 106篇 |
出版年
2020年 | 115篇 |
2019年 | 166篇 |
2018年 | 200篇 |
2017年 | 234篇 |
2016年 | 232篇 |
2015年 | 173篇 |
2014年 | 198篇 |
2013年 | 1037篇 |
2012年 | 235篇 |
2011年 | 289篇 |
2010年 | 233篇 |
2009年 | 287篇 |
2008年 | 299篇 |
2007年 | 287篇 |
2006年 | 289篇 |
2005年 | 258篇 |
2004年 | 252篇 |
2003年 | 261篇 |
2002年 | 256篇 |
2001年 | 432篇 |
2000年 | 379篇 |
1999年 | 306篇 |
1998年 | 171篇 |
1997年 | 130篇 |
1996年 | 146篇 |
1995年 | 139篇 |
1994年 | 140篇 |
1993年 | 144篇 |
1992年 | 246篇 |
1991年 | 256篇 |
1990年 | 251篇 |
1989年 | 258篇 |
1988年 | 229篇 |
1987年 | 229篇 |
1986年 | 272篇 |
1985年 | 264篇 |
1984年 | 241篇 |
1983年 | 219篇 |
1982年 | 160篇 |
1981年 | 133篇 |
1980年 | 120篇 |
1979年 | 156篇 |
1978年 | 88篇 |
1977年 | 117篇 |
1976年 | 97篇 |
1975年 | 75篇 |
1974年 | 90篇 |
1973年 | 86篇 |
1972年 | 81篇 |
1971年 | 71篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
871.
Side-bets and reciprocity as determinants of organizational commitment among correctional officers 总被引:1,自引:1,他引:0
Organizational commitment is a particularly salient characteristic of the prison work climate due to the stressful working conditions and high rate of turnover among correctional officers nationwide, yet little is known about the factors that predict the level of organizational commitment among officers. Becker's (1960) side-bets hypothesis predicts greater commitment among those who develop additional investments in the job that would be lost with a change of jobs, and the reciprocity hypothesis predicts greater commitment among those who feel they are well treated, supported, and respected by the organization. This study used a sample of 546 correctional officers to examine the relative effects of side bets and reciprocity on two components of organizational commitment—affective commitment and continuance commitment. The results of a multivariate OLS regression analysis indicated that reciprocity had a greater effect than side bets on affective commitment but that side bets had a greater effect than reciprocity on continuance commitment. These findings, which provide partial support for the side-bet hypothesis and strong support for the reciprocity hypothesis, are discussed in terms of the link between organizational commitment and other work-related behaviors. 相似文献
872.
D B Busch R W Huntington H A Hartmann 《The American journal of forensic medicine and pathology》1987,8(1):64-67
We here report an unusual, apparently accidental death, in which weakness associated with a progressive neuromuscular disease, Friedreich's ataxia, apparently resulted in the drowning of the deceased. The possibility of neuromuscular disease as a rare cause of drownings should not be overlooked. 相似文献
873.
M L Weaver B K Gan E Allen L D Baugh F Y Liao R H Liu J G Langner A S Walia L F Cook 《Forensic science international》1991,49(1):43-56
Results obtained from three commercial immunoassay kits, Abuscreen, TDx, and EMIT, commonly used for the initial test of urine cannabinoids (and metabolites) were correlated with the 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid (9-THC-COOH) concentration as determined by GC/MS. Correlation coefficients obtained based on 26 (out of 1359 total sample population) highly relevant samples, are 0.601 and 0.438 for Abuscreen and TDx. Correlation coefficients obtained from a parallel study on a different set of 47 (out of 5070 total sample population) highly relevant specimens are 0.658 and 0.575 for Abuscreen and Emit. The immunoassay concentration levels, that correspond to the commonly used 15 ng/ml GC/MS cutoff value for 9-THC-COOH, as calculated from the regression equations are 82 ng/ml and 75 ng/ml for TDx and EMIT and 120 ng/ml and 72 ng/ml for Abuscreen manufactured at two different time periods. The difference of these calculated corresponding concentrations provides quantitative evidence of the reagent specificity differences. 相似文献
874.
Hazards of mattresses, beds and bedding in deaths of infants 总被引:2,自引:0,他引:2
E Gilbert-Barness L Hegstrand S Chandra J L Emery L A Barness R Franciosi R Huntington 《The American journal of forensic medicine and pathology》1991,12(1):27-32
Of 52 infants who had died suddenly and were referred to autopsy, nine had lain on adult water beds for the first time; five had died as a result of accidents; two had died on water beds; two were in beds with widely spaced slats; and one had died as a result of strangulation. Three deaths were due to overlying. Three other infants had been placed on sheepskin rugs for the first time and were found dead shortly thereafter. These infants ranged in age from 2 to 9 months, except for a severely mentally retarded nine-year-old with spastic paraplegia. We believe that a general warning should be issued concerning water beds and that soft bedding should not be used for infants. Infants should not be placed unattended or left to sleep on water beds; only beds recommended for infants should be used. Overlying of a young infant is most likely to occur on a water bed, or if the parent is obese or has consumed alcohol. 相似文献
875.
876.
Shane Darke Ph.D. Johan Duflou M.Med.Path. F.R.C.P.A. Michelle Torok B.Soc.Sc. 《Journal of forensic sciences》2009,54(2):490-494
Abstract: To determine the prevalence and circumstances of psychoactive substances amongst nonoverdose completed suicide, 1436 consecutive cases autopsied at the NSW Department of Forensic Medicine over the period 1/1/1997–12/31/2006 were analyzed. Substances were detected in 67.2% of cases, and illicit drugs in 20.1%. Alcohol was present in 40.6% of cases. Males were more likely to be positive for alcohol, cannabis, and psychostimulants, and females for pharmaceuticals. Illicits were associated with younger age. Alcohol was most prominent amongst toxicity cases, as were opioids, psychostimulants amongst gunshot cases, and pharmaceuticals amongst drownings. Cases in which drug and alcohol histories were noted were more likely to have a substance detected. Alcohol was more common where a suicide note was left and where relationship problems were involved. Pharmaceuticals were more common where a previous attempt was noted. Licit and illicit substances are strongly associated with suicide, even when the method does not involve drug overdose. 相似文献
877.
878.
Claire E.V. French Cynthia G. Jensen Susan K. Vintiner Douglas A. Elliot Susan R. McGlashan 《Forensic Science International Supplement Series》2008,178(1):1-6
There are a number of forensic cases in which the identification of the epithelial cell type from which DNA originated would provide important probative evidence. This study aimed to develop a technique using histological staining of fixed cells to distinguish between skin, buccal and vaginal epithelium. First, 11 different stains were screened on formalin-fixed, wax-embedded cells from five women. Samples were analysed qualitatively by examining staining patterns (colour) and morphology (absence or presence of nuclei). Three of the staining methods – Dane's, Csaba's and Ayoub-Shklar – were successful in distinguishing skin epithelial cells from buccal and vaginal. Second, cells were smeared directly onto slides, fixed with one of five fixatives and stained with one of the three stains mentioned above. Methanol fixation, coupled with the Dane's staining method, specific to keratin, was the only technique that distinguished between all three cell types. Skin cells stained magenta, red and orange and lacked nuclei; buccal cells stained predominantly orange–pink with red nuclei; while vaginal cells stained bright orange with orange nuclei and a blue extracellular hue. This staining pattern in vaginal cells was consistent in samples collected from 50 women aged between 18 and 67. Identification of cell type from unlabelled micrographs by 10 trained observers showed a mean success rate of 95%. The results of this study demonstrate that histological staining may provide forensic scientists with a technique for distinguishing between skin, buccal and vaginal epithelial cells and thus would enable more conclusive analyses when investigating sexual assault cases. 相似文献
879.
The judge in a jury trial is charged with excusing prospective jurors who will not be impartial. To assess impartiality, prospective jurors are typically asked whether they can be fair. Using an experimental paradigm, we found that small changes in jurors' self‐reported confidence in their ability to be fair affected judges' decisions about bias but did not affect the judgments of either attorneys or jurors. We suggest why a judge's role and unique relationship with jurors is likely to foster a decision strategy based on reported juror confidence, and we discuss the implications of our analysis for current legal debates over jury selection practices. Unexpected patterns in our results also highlight the ways in which perceptions of impartiality are affected, in part, by the social characteristics of the observer. 相似文献
880.
E.M. Dauber B. Glock W.R. Mayr 《Forensic Science International: Genetics Supplement Series》2008,1(1):107-108
Two cases of allelic loss at the D19S433 locus after multiplex PCR with the AmpFlSTR Identifiler kit (Applied Biosystems) are described. In both cases the failure of PCR resulted in genetic inconsistencies due to opposite homozygosity. After singleplex PCR with published primers additional alleles were observed and Mendelian inheritance was restored. These PCR products were sequenced and in both cases the same 4 bp deletion near the 3′ end of the repeat region was detected in two alleles of different length. The frequency of these null alleles (two events in 1026 allelic transfers) amounts to 0.0019 (95% confidence limits: 0.0002-0.0070). 相似文献