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   555篇
  免费   21篇
各国政治   39篇
工人农民   33篇
世界政治   45篇
外交国际关系   39篇
法律   289篇
中国共产党   1篇
中国政治   2篇
政治理论   126篇
综合类   2篇
  2023年   8篇
  2022年   4篇
  2021年   7篇
  2020年   18篇
  2019年   13篇
  2018年   16篇
  2017年   19篇
  2016年   23篇
  2015年   9篇
  2014年   12篇
  2013年   72篇
  2012年   18篇
  2011年   14篇
  2010年   20篇
  2009年   18篇
  2008年   20篇
  2007年   22篇
  2006年   12篇
  2005年   14篇
  2004年   20篇
  2003年   11篇
  2002年   15篇
  2001年   19篇
  2000年   10篇
  1999年   8篇
  1998年   9篇
  1997年   9篇
  1996年   6篇
  1995年   9篇
  1994年   7篇
  1993年   5篇
  1992年   7篇
  1991年   5篇
  1989年   9篇
  1988年   7篇
  1987年   5篇
  1986年   7篇
  1985年   9篇
  1984年   7篇
  1983年   5篇
  1982年   5篇
  1981年   7篇
  1980年   9篇
  1979年   3篇
  1978年   5篇
  1977年   3篇
  1975年   2篇
  1974年   2篇
  1973年   2篇
  1972年   2篇
排序方式: 共有576条查询结果,搜索用时 15 毫秒
531.
The 2007 Bali Climate Conference launched a 'meta-negotiation' of unprecedented scale and complexity. Culminating in 2009, climate change delegates must now define the next round of targets for the Kyoto Protocol developed country parties, and comparable provisions for the USA. Most dauntingly, negotiators must also devise a new architecture for further 'action' by developing countries under the Convention. This paper reflects on the key challenges involved in crafting a consensus at the climate conference in 2009 in Copenhagen. In particular, it explores options for reaching agreement with the USA and developing countries, suggesting a transition phase up to 2020. For developing countries, the paper outlines a possible 'choose and no-lose' approach, along with options for increased financing. The paper concludes by looking beyond 2009, emphasizing that, given the complexity of the negotiations, a work programme post-Copenhagen will be needed.  相似文献   
532.
There are three known criteria that underlie drug reimbursement decisions: therapeutic value, cost-effectiveness, and burden of disease. However, evidence from recent reimbursement decisions in several jurisdictions points to residual, unexplained variables, among which is budget impact. Budget impact refers to the total costs that drug reimbursement and use entail with respect to one part of the health care system, pharmaceutical care, or to the entire health care system, taking into account the possible reallocation of resources across budgets or sectors of the health care system. The economic and equity rationale for carrying out budget impact analyses is opportunity cost, or benefits forgone, measured in terms of utility or equitable distribution, by using resources in one way rather than another. In other words, by choosing to draw down the budget in one way, decision makers forgo other opportunities to use the same resources. Under a set of unrealistic assumptions, cost-effectiveness analysis accounts for opportunity cost while conveying to the decision maker the price of maximizing health gains, subject to a budget or resource constraint. However, the underlying assumptions are implausible, particularly in the context of pharmaceutical care. Moreover, budget impact analysis is more useful to the decision maker than cost-effectiveness analysis if the objective is not to maximize health gains subject to a budget or resource constraint, but to reduce variance in health gains. With respect to equitable distribution, budget impact analyses lay bare the individuals or groups who lose out - those who bear the opportunity cost of spending resources in accordance with one decision rule rather than another.  相似文献   
533.
"Dual fingerprint reagents" are chemical formulations which produce with latent fingerprints in a single step, impressions that are both colored and fluorescent. Pre-mixed solutions of the two commercially available ninhydrin analogues, 5-methoxyninhydrin (MN) and 5-methylthioninhydrin (MTN) with zinc or cadmium salts, are true dual reagents. They are much more sensitive than the parent dual reagent, ninhydrin/ZnCl(2). The main advantage of the new formulations is that they can be used at room temperature, with no need to cool the sample to liquid nitrogen temperature. At 0.05% concentration, which is 10-fold lower than the common ninhydrin working solution, MTN/ZnCl(2) is as sensitive as DFO in the fluorescence mode and considerably more sensitive in the color mode. MTN is also slightly cheaper than DFO.  相似文献   
534.
The present study tested the Two-Judgment Theory of Eyewitness Identification Accuracy. Specifically, the extent to which participants were able to engage in an absolute judgment strategy was manipulated by varying the time available to view a lineup. Providing a limited exposure to a lineup should “interrupt” decision making, whereby witnesses can only engage a relative strategy, thus leading to higher false positive responding given a target-absent lineup. Seventy-four adults viewed a 1-minute video that exposed them to an unknown target and subsequently viewed the lineup for a limited (2 s) or an unlimited amount of time. Although false positive rates were similar across conditions, accurate witnesses were more confident than inaccurate witnesses. Confidence was negatively correlated with response latency such that witnesses who took more time to make a decision were less confident in their decisions compared to witnesses who made more rapid decisions. Response latency did not differ for accurate and inaccurate witnesses. Limitations and suggestions for future research on the Two-Judgment Theory are discussed.  相似文献   
535.

Introduction

In the years 1997–2007 in the Forensic Medicine Department, Silesian University of Medicine, Katowice a total of 785 blood samples collected from drivers being the perpetrators of road accidents was tested for the presence of psychoactive drugs.

Methods

The studies took advantage of FPIA (Abbott), ELISA (Neogen), LC–MS and GC FID.

Results

21% of tested samples were positive. In the blood of the driver cannabinoids, amphetamine and its derivatives were most frequently found. Moreover, individual opium alkaloids, their combinations with barbiturates, benzodiazepines or amphetamine, benzodiazepine derivatives (isolated cases), drugs of benzodiazepine group in combination with barbiturates, tramadol or tricyclic anti-depressants (isolated cases), carbamazepine, phenotiazine, cocaine, dibenzepine, benzene, toluene and acetone were determined.

Conclusion

The obtained results showed cannabinoids and amphetamine derivatives to be the most frequent whereas opium alkaloids, barbiturates and benzodiazepines rather rare psychoactive drugs found in the tested blood samples of the drivers involved in the road accidents. The authors suggest screening psychoactive drugs not only in drivers involved in road accidents but also those put through the routine road check procedures. While giving opinions on the influence of the above mentioned drugs on the psychophysical efficiency of road traffic users, drugs and compounds which are not subject to legal control but have an effect on the human psychomotor efficiency and thus, enhance the risk of the road accident should be also taken into account.  相似文献   
536.
This study provides a quasi‐experimental test of 80 consecutive enrollments in the Miami‐Dade (Florida) Dependency Drug Court in order to examine the impact of a family‐based and gender specific intervention, Engaging Moms Program (EMP), on drug court graduation and family reunification. We compared EMP with case management services (CMS). Results indicated that 72% of mothers in the EMP graduated from drug court, and 70% were reunified with their children. In contrast, 38% of mothers receiving CMS graduated from drug court, and 40% were reunited with their children. EMP, then, appears to be a promising family drug court intervention.  相似文献   
537.
New Evidence on the Monetary Value of Saving a High Risk Youth   总被引:1,自引:0,他引:1  
There is growing interest in crime prevention through early youth interventions; yet, the standard United States response to the crime problem, particularly among juveniles, has been to increase the use and resource allocation allotted toward punishment and incapacitation and away from prevention and treatment. At the same time, longitudinal studies of delinquency and crime have repeatedly documented a strong link between past and future behavior and have identified a small subset of offenders who commit a large share of criminal offenses. These findings suggest that if these offenders can be identified early and correctly and provided with prevention and treatment resources early in the life course, their criminal activity may be curtailed. While researchers have studied these offenders in great detail, little attention has been paid to the costs they exert on society. This paper provides estimates of the cost of crime imposed on society by high risk youth. Our approach follows and builds upon the early framework and basic methodology developed by Cohen (J Quant Criminol 14: 5–33, 1998), by using new estimates of the costs of individual crimes, ones that are more comprehensive and that significantly increased the monetary cost per crime. We also use new estimates on the underlying offending rate for high risk juvenile offenders. We estimate the present value of saving a 14-year-old high risk juvenile from a life of crime to range from $2.6 to $5.3 million. Similarly, saving a high risk youth at birth would save society between $2.6 and $4.4 million.
Mark A. CohenEmail:
  相似文献   
538.
Political Behavior - The original version of this article mistakenly listed “the Foundations of Human Behavior Initiative at Harvard University” in Acknowledgements section. The proper...  相似文献   
539.
540.
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