全文获取类型
收费全文 | 5847篇 |
免费 | 197篇 |
专业分类
各国政治 | 463篇 |
工人农民 | 151篇 |
世界政治 | 628篇 |
外交国际关系 | 365篇 |
法律 | 2451篇 |
中国政治 | 35篇 |
政治理论 | 1877篇 |
综合类 | 74篇 |
出版年
2023年 | 26篇 |
2020年 | 74篇 |
2019年 | 100篇 |
2018年 | 132篇 |
2017年 | 153篇 |
2016年 | 164篇 |
2015年 | 113篇 |
2014年 | 151篇 |
2013年 | 947篇 |
2012年 | 150篇 |
2011年 | 173篇 |
2010年 | 145篇 |
2009年 | 142篇 |
2008年 | 191篇 |
2007年 | 254篇 |
2006年 | 190篇 |
2005年 | 178篇 |
2004年 | 194篇 |
2003年 | 190篇 |
2002年 | 183篇 |
2001年 | 105篇 |
2000年 | 114篇 |
1999年 | 91篇 |
1998年 | 124篇 |
1997年 | 99篇 |
1996年 | 107篇 |
1995年 | 81篇 |
1994年 | 73篇 |
1993年 | 87篇 |
1992年 | 73篇 |
1991年 | 91篇 |
1990年 | 77篇 |
1989年 | 69篇 |
1988年 | 76篇 |
1987年 | 86篇 |
1986年 | 85篇 |
1985年 | 51篇 |
1984年 | 70篇 |
1983年 | 70篇 |
1982年 | 66篇 |
1981年 | 50篇 |
1980年 | 47篇 |
1979年 | 43篇 |
1978年 | 44篇 |
1977年 | 46篇 |
1976年 | 26篇 |
1975年 | 26篇 |
1974年 | 27篇 |
1973年 | 34篇 |
1972年 | 23篇 |
排序方式: 共有6044条查询结果,搜索用时 328 毫秒
951.
952.
953.
954.
955.
The Effectiveness of Trace DNA Profiling—A Comparison Between a U.S. and a U.K. Law Enforcement Jurisdiction
下载免费PDF全文
![点击此处可从《Journal of forensic sciences》网站下载免费的PDF全文](/ch/ext_images/free.gif)
John W. Bond O.B.E. D.Phil. Jocelyn R. Weart O.B.E. D.Phil. 《Journal of forensic sciences》2017,62(3):753-760
Recovery, profiling, and speculative searching of trace DNA (not attributable to a body fluid/cell type) over a twelve‐month period in a U.S. Crime Laboratory and U.K. police force are compared. Results show greater numbers of U.S. firearm‐related items submitted for analysis compared with the U.K., where greatest numbers were submitted from burglary or vehicle offenses. U.S. multiple recovery techniques (double swabbing) occurred mainly during laboratory examination, whereas the majority of U.K. multiple recovery techniques occurred at the scene. No statistical difference was observed for useful profiles from single or multiple recovery. Database loading of interpretable profiles was most successful for U.K. items related to burglary or vehicle offenses. Database associations (matches) represented 7.0% of all U.S. items and 13.1% of all U.K. items. The U.K. strategy for burglary and vehicle examination demonstrated that careful selection of both items and sampling techniques is crucial to obtaining the observed results. 相似文献
956.
Quantitative Determination of Cannabinoids in Cannabis and Cannabis Products Using Ultra‐High‐Performance Supercritical Fluid Chromatography and Diode Array/Mass Spectrometric Detection
下载免费PDF全文
![点击此处可从《Journal of forensic sciences》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Mei Wang Ph.D. Yan‐Hong Wang Ph.D. Bharathi Avula Ph.D. Mohamed M. Radwan Ph.D. Amira S. Wanas Ph.D. Zlatko Mehmedic M.Sc. John van Antwerp B.Sc. Mahmoud A. ElSohly Ph.D. Ikhlas A. Khan Ph.D. 《Journal of forensic sciences》2017,62(3):602-611
Ultra‐high‐performance supercritical fluid chromatography (UHPSFC ) is an efficient analytical technique and has not been fully employed for the analysis of cannabis. Here, a novel method was developed for the analysis of 30 cannabis plant extracts and preparations using UHPSFC /PDA ‐MS . Nine of the most abundant cannabinoids, viz . CBD , ?8‐THC , THCV , ?9‐THC , CBN , CBG , THCA ‐A, CBDA , and CBGA , were quantitatively determined (RSD s < 6.9%). Unlike GC methods, no derivatization or decarboxylation was required prior to UHPSFC analysis. The UHPSFC chromatographic separation of cannabinoids displayed an inverse elution order compared to UHPLC . Combining with PDA ‐MS , this orthogonality is valuable for discrimination of cannabinoids in complex matrices. The developed method was validated, and the quantification results were compared with a standard UHPLC method. The RSD s of these two methods were within ±13.0%. Finally, chemometric analysis including principal component analysis (PCA ) and partial least squares‐discriminant analysis (PLS ‐DA ) were used to differentiate between cannabis samples. 相似文献
957.
John Hudson 《The Journal of legal history》2017,38(2):130-154
Beyond dealing with wrongdoing and litigation, law has many other functions. It can be designed to make life more predictable, it can facilitate and promote certain actions, it can seek to prevent disputes by laying down rules, and provide routes to solutions other than litigation should disputes arise. All of these can have connections to matters of emotion. Using both lawbooks and records of cases from the Angevin period, the present article begins by looking at issues of land law rather than crime, and at law outside rather than inside court. It then returns to crime and litigation before exploring the significance of the nature of legal records for the relationship between emotion and law. In doing so, it pays attention to emotion in action, to uses of emotionally charged language, to appearances of the vocabulary of emotions, and to the routinized use of words that might at other times or in other contexts have an emotional element. Underlying the analysis is an exploration of the ways in which some aspects of law became more discrete from ordinary social practice and discourse, in this instance through elements of distancing from emotion. 相似文献
958.
John Gardner 《The Modern law review》2017,80(1):1-21
This contribution distinguishes two kinds of responsibility: the basic (or ‘metaphysical’) kind that we all inescapably have as functioning human beings; and the assignable (or ‘political’) kind that connects each of us with some particular tasks, and not with others. Having explored some differences between the two, and in particular the role of law's authority in connection with each, the discussion turns to the negligence standard, especially but not only as it figures in tort law. Recently, several philosophers have attempted to find a role for the negligence standard in the metaphysics of basic responsibility. This contribution resists that development and stands up for the traditional lawyer's view that the negligence standard belongs to the pliable politics of assignable responsibility. Basic responsibility, it is argued, is fundamentally strict. 相似文献
959.
Nancy Nicosia John M. MacDonald Rosalie Liccardo Pacula 《Journal of Quantitative Criminology》2017,33(1):179-205
Objective
This paper addresses previous shortcomings in the literature on racial disparities in incarceration for drug offenders by taking advantage of a change in sentencing policy in California and a rich administrative dataset that is able to create a sample of comparable White and Black offenders.Method
We use a nonparametric propensity weighting approach to identify similarly situated White and Black male offenders charged with drug-related offenses. We combine this approach with a difference-in-differences model to estimate the effect that a change in California sentencing law for convicted non-violent drug offenders had on racial disparities in prison and drug treatment dispositions.Results
We find substantial reductions in the probability of a prison sentence after the policy change, but not differentially for Blacks. Blacks remain more likely to go to prison than similarly situated Whites after the policy, although the policy does lead to more referrals to treatment for Blacks.Conclusions
This paper shows that even after comparing Blacks and Whites in similarly situated contexts that racial disparities in prison commitments remain after sentencing law changes that mandate diversion to drug treatment. The results suggests that addressing racial gaps in the commitments to state prisons will likely require more than shifting the eligibility of drug convictions for prison, as accumulated criminal histories are the primary driver of prison sentences. This means that expanding diversion options from prison alone will not reduce the racial gap in commitments to prison for drug offenses more than incrementally.960.