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   4469篇
  免费   224篇
各国政治   268篇
工人农民   143篇
世界政治   408篇
外交国际关系   325篇
法律   1855篇
中国共产党   2篇
中国政治   49篇
政治理论   1589篇
综合类   54篇
  2023年   24篇
  2021年   37篇
  2020年   68篇
  2019年   96篇
  2018年   136篇
  2017年   151篇
  2016年   163篇
  2015年   102篇
  2014年   131篇
  2013年   724篇
  2012年   113篇
  2011年   140篇
  2010年   124篇
  2009年   137篇
  2008年   126篇
  2007年   125篇
  2006年   148篇
  2005年   151篇
  2004年   132篇
  2003年   132篇
  2002年   150篇
  2001年   97篇
  2000年   93篇
  1999年   79篇
  1998年   75篇
  1997年   78篇
  1996年   42篇
  1995年   60篇
  1994年   64篇
  1993年   66篇
  1992年   44篇
  1991年   60篇
  1990年   44篇
  1989年   58篇
  1988年   37篇
  1987年   40篇
  1986年   47篇
  1985年   51篇
  1984年   32篇
  1983年   48篇
  1982年   44篇
  1981年   56篇
  1980年   42篇
  1979年   45篇
  1978年   42篇
  1977年   25篇
  1976年   35篇
  1975年   21篇
  1974年   23篇
  1973年   24篇
排序方式: 共有4693条查询结果,搜索用时 31 毫秒
891.
This article examines relationships between local drug policy (as represented by prosecutor-reported case outcomes for first-offender juvenile marijuana possession cases) and youth self-reported marijuana use, perceived risk, and disapproval. Interviews with prosecutors and surveys of 8th-, 10th-, and 12th-grade students in the United States were conducted in 2000. Analyses include data from 97 prosecutors and students from 127 schools in 40 states. Results indicate significant relationships between local drug policy and youth marijuana use and attitudes. In general, more-severe dispositions are associated with less marijuana use, higher disapproval rates, and increased perceptions of great risk. Associations primarily appear to be specific to marijuana-related outcomes. Results are discussed within the framework of both deterrence and broader social norms regarding substance use.  相似文献   
892.
Abstract: The AmpF?STR® MiniFilerTM PCR Amplification Kit is designed to genotype degraded and/or inhibited DNA samples when the AmpF?STR® IdentifilerTM PCR Amplification Kit is incapable of generating a complete genetic profile. Validation experiments, following the SWGDAM guidelines, were designed to evaluate the performance of MiniFiler. Data obtained demonstrated that MiniFiler, when used in conjunction with Identifiler, provided an increased ability to obtain genetic profiles from challenged samples. The optimum template range was found to be between 0.2 and 0.6 ng, with 0.3 ng yielding the best results. Full concordance was achieved between the MiniFiler kit and Identifiler kit except in a single case of a null allele at locus D21S11. Numerous instances of severe heterozygous peak imbalance (<50%) were observed in single source samples amplified within the optimum range of input DNA suggesting that caution be taken when attempting to deduce component genotypes in a mixture.  相似文献   
893.
Abstract: There remains significant uncertainty in illicit marijuana cultivation. We analyzed the δ13C and δ15N of 508 domestic samples from known U.S.A. counties, 31 seized from a single location, 5 samples grown in Mexico and Colombia, and 10 northwest border seizures. For a subset, inflorescences and leaves were analyzed separately. These data revealed a strong correspondence, with inflorescences having slightly higher δ13C and δ15N values than leaves. A framework for interpreting these results is introduced and evaluated. Samples identified as outdoor‐grown by δ13C were generally recorded as such by the Drug Enforcement Administration (DEA). DEA‐classified indoor‐grown samples had the most negative δ13C values, consistent with indoor cultivation, although many were also in the outdoor‐grown domain. δ15N indicated a wide range of fertilizers across the dataset. Samples seized at the single location suggested multiple sources. Northwest border δ13C values suggested indoor growth, whereas for the Mexican and Colombian samples they indicated outdoor growth.  相似文献   
894.
Abstract: We examined the characteristics of subway train‐related fatalities in New York City between Jan. 1, 2003 and May 31, 2007 in order to determine which factors are useful in differentiating accident from suicide. Subway train‐related deaths with homicide and undetermined manners also are included. During this period, there were 211 subway train‐related fatalities. The manners of death were: suicide (n = 111), accident (n = 76), undetermined (n = 20), and homicide (n = 4). The causes of death were blunt trauma (n = 206) and electrocution (n = 5). Torso transection and extremity amputation were more frequent in suicides. Antidepressant medications were more frequently detected in suicides, whereas cocaine and ethanol were more frequent in accidents. However, autopsy findings should be weighed in the context of the entire evaluation along with other circumstantial and investigative findings. In unwitnessed deaths where additional information is unavailable or discrepant, the most appropriate manner of death usually is undetermined.  相似文献   
895.
Accurately predicting inpatient aggression is an important endeavor. The current study investigated inpatient aggression over a six-month time period in a sample of 152 male forensic patients. We assessed constructs of psychopathy, anger, and active symptoms of mental illness and tested their ability to predict reactive and instrumental aggression. Across all levels of analyses, anger and active symptoms of mental illness predicted reactive aggression. Traits of psychopathy, which demonstrated no relationship to reactive aggression, were a robust predictor of instrumental aggression. This study (a) reestablishes psychopathy as a clinically useful construct in predicting inpatient instrumental aggression, (b) provides some validation for the reactive/instrumental aggression paradigm in forensic inpatients, and (c) makes recommendations for integrating risk assessment results into treatment interventions.
Michael J. VitaccoEmail:
  相似文献   
896.
We examined the association between psychopathy, assessed using the Hare Psychopathy Checklist-Revised: Screening Version (Hart et al., Manual for the psychopathy checklist screening version (PCL:SV), 1995), and stalking in 61 men convicted of stalking-related offenses. Psychopathic symptoms were rare, but their presence—especially that of affective deficit symptoms—was associated with victimization of casual acquaintances and with several risk factors from the Guidelines for Stalking Assessment and Management (SAM) (Kropp et al., Guidelines for stalking assessment and management, 2008a), including stalking in violation of supervision orders, degree of preoccupation with victims, and targeting of victims with limited access to external resources. The findings suggest that in spite of their rarity, psychopathic traits may be important in the assessment and management of stalking risk.
Stephen D. HartEmail:
  相似文献   
897.
Computer-implemented inventions feature in almost every field of technology, and although improvements to computer-based devices are routinely made in software, the circumstances in which patent protection is available remains unclear. The patentability of software varies considerably from jurisdiction to jurisdiction. Worryingly, there are variations in form, if not in substance, between patent offices working from the same legal source. Against the background of a sea change in the US position, there is the prospect of a clarification of the European Patent Office approach that will provide a platform for consistency in Europe. This paper focuses on the UK position, highlights the tension between the UK and the EPO and considers the key questions before the EPO's Enlarged Board of Appeal.  相似文献   
898.
Geographic location, time of reporting and need for rapid evaluation contributed to a lack of intelligence concerning a suspect burial site in scrub woodland (~15 km from the last known location of a missing person) in Northern Ireland. Police received reports of a subsiding ‘grave’, which was evaluated positively using GPR and victim recovery dogs (VRD). After 24 h work, archaeological excavation showed a vertical-sided, stepped excavation on undisturbed clay with no inhumation. Subsequent research showed the feature to be an engineering trial pit. The GPR response was a water table and rocks, VRD were possibly reacting to disturbed ground. The work serves as a demonstration of good archaeological practice in suspect burial excavation, following a lack of landscape evaluation and poor overall intelligence.  相似文献   
899.
Offending specialization continues to be a subject of empirical inquiry for scholars interested in criminal careers. Early research consistently spoke to the generality of offending profiles, but more recent work has revealed somewhat mixed findings. These results have emerged alongside newly developed and applied methods that detect and describe offending specialization. To what extent these methods shape divergent conclusions and/or provide overlapping insight remains unclear, however. Therefore, the degree to which more recent inquiries are actually studying the same operational definition of specialization is unknown. In order to consider this issue further, this study utilizes four frequently applied approaches with a single data set. The study indicates when and where findings converge and also describes any unique insights provided by each method. The work concludes with a discussion surrounding the utility of applying multiple strategies in assessing specialization in criminal offending.  相似文献   
900.
This paper explores a Victorian cause célèbre, particularly the latter stages, in which a London solicitor, W.H. Barber, battled first to obtain the renewal of his practising certificate and then to claim compensation from public funds for the sufferings he had endured as a result of his wrongful conviction. Barber's misfortunes arose from his unwitting participation in a series of sensational frauds on the Bank of England, leading to his transportation to the penal colony on Norfolk Island in 1844. Pardoned on the basis of confessions from the wrongdoers, his readmission to the profession was unrelentingly opposed by the Incorporated Law Society, and he only prevailed after a series of rebuffs in the courts.

Barber's tribulations, which had first highlighted the defects of the criminal trial, provide an unusual insight into the under-explored and uncertain state of solicitors' professional ethics at this time and the controversial role of the ILS in enforcing them. They also yield valuable information on solicitors' practices and the effects of a royal pardon.  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