全文获取类型
收费全文 | 872篇 |
免费 | 43篇 |
专业分类
各国政治 | 72篇 |
工人农民 | 128篇 |
世界政治 | 69篇 |
外交国际关系 | 36篇 |
法律 | 359篇 |
中国政治 | 8篇 |
政治理论 | 240篇 |
综合类 | 3篇 |
出版年
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 3篇 |
2020年 | 14篇 |
2019年 | 26篇 |
2018年 | 35篇 |
2017年 | 40篇 |
2016年 | 25篇 |
2015年 | 24篇 |
2014年 | 39篇 |
2013年 | 138篇 |
2012年 | 26篇 |
2011年 | 39篇 |
2010年 | 15篇 |
2009年 | 23篇 |
2008年 | 37篇 |
2007年 | 32篇 |
2006年 | 44篇 |
2005年 | 35篇 |
2004年 | 39篇 |
2003年 | 34篇 |
2002年 | 38篇 |
2001年 | 11篇 |
2000年 | 12篇 |
1999年 | 11篇 |
1998年 | 10篇 |
1997年 | 10篇 |
1996年 | 7篇 |
1995年 | 7篇 |
1994年 | 13篇 |
1993年 | 14篇 |
1992年 | 15篇 |
1991年 | 11篇 |
1990年 | 7篇 |
1989年 | 6篇 |
1988年 | 4篇 |
1987年 | 9篇 |
1986年 | 5篇 |
1985年 | 11篇 |
1984年 | 4篇 |
1983年 | 6篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 3篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1956年 | 1篇 |
排序方式: 共有915条查询结果,搜索用时 15 毫秒
51.
52.
53.
Schneider PM Bender K Mayr WR Parson W Hoste B Decorte R Cordonnier J Vanek D Morling N Karjalainen M Marie-Paule Carlotti C Sabatier M Hohoff C Schmitter H Pflug W Wenzel R Patzelt D Lessig R Dobrowolski P O'Donnell G Garafano L Dobosz M De Knijff P Mevag B Pawlowski R Gusmão L Conceicao Vide M Alonso Alonso A García Fernández O Sanz Nicolás P Kihlgreen A Bär W Meier V Teyssier A Coquoz R Brandt C Germann U Gill P Hallett J Greenhalgh M 《Forensic science international》2004,139(2-3):123-134
Degradation of human DNA extracted from forensic stains is, in most cases, the result of a natural process due to the exposure of the stain samples to the environment. Experiences with degraded DNA from casework samples show that every sample may exhibit different properties in this respect, and that it is difficult to systematically assess the performance of routinely used typing systems for the analysis of degraded DNA samples. Using a batch of artificially degraded DNA with an average fragment size of approx. 200 bp a collaborative exercise was carried out among 38 forensic laboratories from 17 European countries. The results were assessed according to correct allele detection, peak height and balance as well as the occurrence of artefacts. A number of common problems were identified based on these results such as strong peak imbalance in heterozygous genotypes for the larger short tandem repeat (STR) fragments after increased PCR cycle numbers, artefact signals and allelic drop-out. Based on the observations, strategies are discussed to overcome these problems. The strategies include careful balancing of the amount of template DNA and the PCR cycle numbers, the reaction volume and the amount of Taq polymerase. Furthermore, a careful evaluation of the results of the fragment analysis and of automated allele calling is necessary to identify the correct alleles and avoid artefacts. 相似文献
54.
Lindsay WR Smith AH Law J Quinn K Anderson A Smith A Allan R 《Journal of interpersonal violence》2004,19(8):875-890
This article reports an evaluation of a community intellectual disability offender service over the period from 1990 to 2001. Men who committed sex offenses or sexually abusive incidents (n = 106) and men who committed other types of offenses and serious incidents (n = 78) are compared on personal characteristics, referral sources, forensic details, and outcome up to 7 years after referral. The cohorts are older than one would expect from the criminology literature, and, at about 33%, the incidence of mental illness is consistent with some previous studies. A greater proportion of sex offenders had criminal justice involvement and a formal disposal from court. Fire raising was not overly represented as an offense. There was a higher rate of reoffending in the nonsexual cohort, which persisted up to 7 years. Investigating only reoffenders, there was a considerable amount of harm reduction recorded up to 7 years, statistically significant up to 5 years following initial referral. 相似文献
55.
56.
57.
58.
59.
An Estimator for Some Binary-Outcome Selection Models Without Exclusion Restrictions 总被引:2,自引:0,他引:2
This article provides a new maximum-likelihood estimator forselection models with dichotomous dependent variables when identicalfactors affect the selection equation and the equation of interest.Such situations arise naturally in game-theoretic models whereselection is typically nonrandom and identical explanatory variablesinfluence all decisions under investigation. When identicalexplanatory variables influence selection and a subsequent outcomeof interest, the commonly used Heckman-type estimators identifyfrom distributional assumptions about the residuals alone. Whenits own identifying assumption is reasonable, the new estimatorallows the researcher to avoid the painful choice between identifyingfrom distributional assumptions alone and adding a theoreticallyunjustified variable to the selection equation in a mistakenattempt to "boost" identification. The article uses Monte Carlomethods to compare the small-sample properties of the estimatorwith those of the Heckman-type estimator and ordinary probit. 相似文献
60.
Griffith GM 《Journal of health law》2001,34(4):567-613
This Article analyzes the implications and strategies of incorporating the Taxpayer Bill of Rights 2 ("TBOR2") into tax-exempt healthcare organizations' compliance plans. Beginning with a brief overview of TBOR2, the author examines the presumption of fair market value, how such organizations establish safe harbors, the current Internal Revenue Service (IRS or Service) position regarding enforcement of TBOR2, and the lurking potential for "whistleblowers" to start auditory procedures with an eye toward IRS bounties. Mr. Griffith concludes that the best advice for exempt organizations is to follow the rebuttable presumption procedure for all transactions involving potential disqualified persons, including staff and employed physicians, and seek to fit within the safe harbors for the less routine and larger of those transactions. 相似文献