全文获取类型
收费全文 | 1564篇 |
免费 | 62篇 |
专业分类
各国政治 | 109篇 |
工人农民 | 101篇 |
世界政治 | 171篇 |
外交国际关系 | 89篇 |
法律 | 753篇 |
中国政治 | 7篇 |
政治理论 | 380篇 |
综合类 | 16篇 |
出版年
2023年 | 18篇 |
2022年 | 8篇 |
2021年 | 10篇 |
2020年 | 29篇 |
2019年 | 44篇 |
2018年 | 50篇 |
2017年 | 53篇 |
2016年 | 71篇 |
2015年 | 34篇 |
2014年 | 56篇 |
2013年 | 236篇 |
2012年 | 45篇 |
2011年 | 40篇 |
2010年 | 31篇 |
2009年 | 51篇 |
2008年 | 54篇 |
2007年 | 46篇 |
2006年 | 28篇 |
2005年 | 38篇 |
2004年 | 49篇 |
2003年 | 41篇 |
2002年 | 39篇 |
2001年 | 49篇 |
2000年 | 53篇 |
1999年 | 30篇 |
1998年 | 25篇 |
1997年 | 22篇 |
1996年 | 15篇 |
1995年 | 12篇 |
1994年 | 18篇 |
1993年 | 16篇 |
1992年 | 22篇 |
1991年 | 29篇 |
1990年 | 31篇 |
1989年 | 21篇 |
1988年 | 22篇 |
1987年 | 18篇 |
1986年 | 14篇 |
1985年 | 19篇 |
1984年 | 15篇 |
1983年 | 14篇 |
1982年 | 13篇 |
1980年 | 8篇 |
1979年 | 14篇 |
1978年 | 6篇 |
1976年 | 9篇 |
1975年 | 6篇 |
1974年 | 6篇 |
1973年 | 9篇 |
1972年 | 7篇 |
排序方式: 共有1626条查询结果,搜索用时 31 毫秒
261.
Christina Mancini Amy K. Cook Jessica C. Smith Robyn McDougle 《Journal of school violence》2020,19(4):610-622
ABSTRACT Recently, states have enacted teacher-carry laws. While controversial, little scholarship has tapped public attitudes toward such reforms. Because public opinion shapes policy, the public is an important stakeholder in this debate. Thus, we investigated three questions. First, how supportive is the public of arming teachers? Second, what demographic and social divides exist, if any, for reform approval? Finally, do crime-related perceptions, concerning views about public safety, and criminogenic influences shape policy preferences? We test these questions using a 2018 poll of Virginia residents (N = 521). Overall, approval for teacher-carry is split. Crime-related perceptions mediate some of the initial social and demographic divides in opinion but other correlates, such as parental status, remain salient predictors of views. Implications are discussed. 相似文献
262.
263.
264.
Organic impurity profiling of fentanyl samples associated with recent clandestine laboratory methods
Steven G. Toske PhD Jennifer R. Mitchell MS James M. Myslinski PhD Andrew J. Walz PhD David B. Guthrie PhD Elizabeth M. Guest PhD Charlotte A. Corbett PhD Emily D. Lockhart MS 《Journal of forensic sciences》2023,68(5):1470-1483
Nearly a decade ago, fentanyl reappeared in the United States illicit drug market. In the years since, overdose deaths have continued to rise as well as the amount of fentanyl seized by law enforcement agencies. Research surrounding fentanyl production has been beneficial to regulatory actions and understanding illicit fentanyl production. In 2017, the Drug Enforcement Administration (DEA) began collecting seized fentanyl samples from throughout the United States to track purity, adulteration trends, and synthetic impurity profiles for intelligence purposes. The appearance of a specific organic impurity, phenethyl-4-anilino-N-phenethylpiperidine (phenethyl-4-ANPP) indicates a shift in fentanyl production from the traditional Siegfried and Janssen routes to the Gupta-patent route. Through a collaboration between the DEA and the US Army's Combat Capabilities Development Command Chemical Biological Center (DEVCOM CBC), the synthesis of fentanyl was investigated via six synthetic routes, and the impurity profiles were compared to those of seized samples. The synthetic impurity phenethyl-4-ANPP was reliably observed in the Gupta-patent route published in 2013, and its structure was confirmed through isolation and structure elucidation. Organic impurity profiling results for illicit fentanyl samples seized in late 2021 have indicated yet another change in processing with the appearance of the impurity ethyl-4-anilino-N-phenethylpiperidine (ethyl-4-ANPP). Through altering reagents traditionally used in the Gupta-patent route, the formation of this impurity was determined to occur through a modification of the route as originally described in the Gupta patent. 相似文献
265.
266.
Courts frequently rely on parenting capacity assessments to make decisions about visitation and case progress in child protection court. Although these evaluations can provide valuable information to courts, they often involve assessing areas of human behavior that are not clearly defined in the literature. For example, mental health professionals are often tasked with identifying risk and protective factors for child maltreatment while identifying factors that can impede progress towards reunification. Although some of these factors may be easy to identify and assess (e.g., symptoms of mental illness or substance abuse), others may be more challenging. For example, factors such as denial and minimization about risk factors and maltreatment, a parent(s)’ ability to protect their child(ren) from future incidents of maltreatment, the parent(s)’ potential for change, and the consideration of what is in the best interest of the child are hard to assess. This article will provide a summary of the research in these areas, provide tips for managing these areas, and highlight directions for future investigation that will help inform parenting capacity assessments in child protection court. 相似文献
267.
268.
269.
AbstractThe right to health is enshrined in the South African Constitution as well as a range of international and regional human rights treaties which South Africa accepts. Yet empirical data reveals some of the challenges faced by South African youth—childhood diseases, HIV/AIDS and such like. There are evidently challenges realising the right to health in practice. Nevertheless, South African courts have led the international field in recognising the justiciability of economic and social rights such as the right to health. Having reviewed the applicable laws and jurisprudence, the paper will conclude that a more holistic human rights-based approach offers perhaps the best way forward. 相似文献
270.
Angel Smith 《Journal of Iberian and Latin American Studies》2016,22(1):55-73
AbstractThe article focuses on the reasons behind both the consolidation of what I have termed “respectable” liberalism between the 1830s and the 1840s and its subsequent decline and fall between 1900 and 1923. In understanding both processes I study the links established between “respectable” liberals and propertied elites, the monarchy, and the Church. In the first phase these links served to consolidate the liberal polity. However, they also meant that many tenets of liberal ideology were compromised. Free elections were undermined by the operation of caciquismo, monarchs established a powerful position, and despite the Church hierarchy working with liberalism, the doctrine espoused by much of the Church was still shaped by the Counter-Reformation. Hence, “respectable” liberalism failed to achieve a popular social base. And the liberal order was increasingly denigrated as part of the corrupt “oligarchy” that ruled Spain. Worse still, between 1916 and 1923 the Church, monarch, and the propertied elite increasingly abandoned the liberal Monarchist Restoration. Hence when General Primo de Rivera launched his coup the rug was pulled from under the liberals’ feet and there was no one to cushion the fall. 相似文献