全文获取类型
收费全文 | 249篇 |
免费 | 11篇 |
专业分类
各国政治 | 20篇 |
工人农民 | 18篇 |
世界政治 | 23篇 |
外交国际关系 | 14篇 |
法律 | 99篇 |
政治理论 | 83篇 |
综合类 | 3篇 |
出版年
2023年 | 2篇 |
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 6篇 |
2019年 | 7篇 |
2018年 | 9篇 |
2017年 | 8篇 |
2016年 | 11篇 |
2015年 | 6篇 |
2014年 | 14篇 |
2013年 | 46篇 |
2012年 | 2篇 |
2011年 | 9篇 |
2010年 | 2篇 |
2009年 | 5篇 |
2008年 | 4篇 |
2007年 | 12篇 |
2006年 | 6篇 |
2005年 | 5篇 |
2004年 | 7篇 |
2003年 | 6篇 |
2002年 | 9篇 |
2001年 | 4篇 |
2000年 | 6篇 |
1999年 | 6篇 |
1998年 | 2篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1987年 | 6篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1974年 | 3篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有260条查询结果,搜索用时 15 毫秒
251.
Analysis of a large sample of suicide notes from 262 suicides in Australia found that men less often had escape from pain as a motive for their suicides and more often had love/romantic problems. The suicides of older persons were more often motivated by escape from pain and less often had love/romantic problems. 相似文献
252.
Michelle Wood Marleen Laloup Maria del Mar Ramirez Fernandez Kevin M. Jenkins Michael S. Young Jan G. Ramaekers Gert De Boeck Nele Samyn 《Forensic Science International Supplement Series》2005,150(2-3):227
We present a validated method for the simultaneous analysis of basic drugs which comprises a sample clean-up step, using mixed-mode solid-phase extraction (SPE), followed by LC–MS/MS analysis. Deuterated analogues for all of the analytes of interest were used for quantitation. The applied HPLC gradient ensured the elution of all the drugs examined within 14 min and produced chromatographic peaks of acceptable symmetry. Selectivity of the method was achieved by a combination of retention time, and two precursor-product ion transitions for the non-deuterated analogues. Oral fluid was collected with the Intercept®, a FDA approved sampling device that is used on a large scale in the US for workplace drug testing. However, this collection system contains some ingredients (stabilizers and preservatives) that can cause substantial interferences, e.g. ion suppression or enhancement during LC–MS/MS analysis, in the absence of suitable sample pre-treatment. The use of the SPE was demonstrated to be highly effective and led to significant decreases in the interferences. Extraction was found to be both reproducible and efficient with recoveries >76% for all of the analytes. Furthermore, the processed samples were demonstrated to be stable for 48 h, except for cocaine and benzoylecgonine, where a slight negative trend was observed, but did not compromise the quantitation. In all cases the method was linear over the range investigated (2–200 μg/L) with an excellent intra-assay and inter-assay precision (coefficients of variation <10% in most cases) for QC samples spiked at a concentration of 4, 12 and 100 μg/L. Limits of quantitation were estimated to be at 2 μg/L with limits of detection ranging from 0.2 to 0.5 μg/L, which meets the requirements of SAMHSA for oral fluid testing in the workplace. The method was subsequently applied to the analysis of Intercept® samples collected at the roadside by the police, and to determine MDMA and MDA levels in oral fluid samples from a controlled study. 相似文献
253.
Laloup M Del Mar Ramirez Fernandez M Wood M De Boeck G Maes V Samyn N 《Forensic science international》2006,161(2-3):175-179
Oral fluid (collected with the Intercept((R)) device) and plasma samples were obtained from 139 individuals suspected of driving under the influence of drugs and analyzed for Delta(9)-tetrahydrocannabinol (THC), the major psychoactive constituent of cannabis, using a validated quantitative LC-MS-MS method. The first aim of the study was to investigate the correlation between the analytical data obtained in the plasma and oral fluid samples, to evaluate the use of oral fluid as a 'predictor' of actual cannabis influence. The results of the study indicated a good accuracy when comparing THC detection in oral fluid and plasma (84.9-95.7% depending on the cut-off used for plasma analysis). ROC curve analysis was subsequently used to determine the optimal cut-off value for THC in oral fluid with plasma as reference sample, in order to 'predict' a positive plasma result for THC. When using the LOQ of the method for plasma (0.5 ng/mL), the optimal cut-off was 1.2 ng/mL THC in oral fluid (sensitivity, 94.7%; specificity, 92.0%). When using the legal cut-off in Belgium for driving under the influence in plasma (2 ng/mL), an optimal cut-off value of 5.2 ng/mL THC in oral fluid (sensitivity, 91.6%; specificity, 88.6%) was observed. In the second part of the study, the performance of the on-site Dr?ger DrugTest for the screening of THC in oral fluid during roadside controls was assessed by comparison with the corresponding LC-MS-MS results in plasma and oral fluid. Since the accuracy was always less than 66%, we do not recommend this Dr?ger DrugTest system for the on-site screening of THC in oral fluid. 相似文献
254.
Wood RE 《Forensic science international》2006,159(Z1):S47-S55
Radiology has been used extensively in conventional dental identification, anatomically based identification and identification using maxillofacial skeletal landmarks such as the frontal sinus. Examples of these are well documented in the literature. The purpose of this paper was to revisit the methods where radiographic methods may be used to determine identity using the teeth, the root structures and the frontal sinuses. Additionally suggestions are offered for management of radiography in mass disasters and cases where age determination is required. Computer assisted tomography can be used in the assessment of the degree of fit of a weapon to a wound in cases of blunt force skull injury and plane films can assist in depicting the pattern of post mortem skull fractures. Micro-computed tomography has been used in matching weapons to wounds in sharp-force injury cases. The radiologist's role in cases of civil litigation and fraud is discussed and case examples are given. There are gaps in the science where radiological methods are used. The author offers several suggestions for possible research projects to close some of these gaps. 相似文献
255.
Stephen Wood 《International Journal of Politics, Culture, and Society》2001,14(3):621-642
Language is a major component of identification for individuals and nations, and linguistic difference has manifested itself as an enduring political issue. This continues in the age of globalization when the presence of a powerful global force, the English language, now less attached to a particular national entity, is viewed as intrusive among language groups that are, including in the most economically and technologically advanced countries. Some groups and individuals within Germany's postindustrial civil society are conducting an ardent defence of German against the encroachment of English. The German state, meanwhile, is pressured to support the national language while adapting, like the private economy, to new imperatives that tend to magnify the presence of English. 相似文献
256.
DNA was extracted from human and non-primate dried blood stains. Human male and female specimens were readily distinguished by analysis with a Y-chromosome specific DNA probe. Human and non-primate blood stains were also readily differentiated using a repeat sequence (Alu) DNA probe. The potential power of recombinant DNA analysis in forensic science is discussed. 相似文献
257.
258.
Although declining political engagement has been identified as a key problem for advanced liberal democracies, this article suggests that a more profound tension needs to be addressed. Specifically, it identifies interdependences between growing political pressures on national governments, and the tendency to delegate decisions away from control by elected politicians. These processes of “hyper-democracy” and “hyper-depoliticization” arguably create and re-enforce political tensions, magnifying a risk of central government “overload.” Through analyzing the arguments of prominent scholars of democracy, the article picks apart these interdependencies and argues for a more balanced approach to democratic governance. 相似文献
259.
As the United States struggles with national solutions to address climate change, state and local governments have become leaders in both mitigation and adaptation policy. Although a significant and growing body of research targets these policies, most studies have assumed common factors motivating both adaptation and mitigation policy adoption. There remains a need for more research on cities of all sizes, their adoption of specific local policies, the factors motivating those choices, and whether the influences for mitigation differ from those that motivate adaptation. The paper uses data from a new survey of over 200 local governments in eleven states of the Great Plains region, including measures distinguishing between mitigation and adaptation policies. These data are employed to test the relative influence of factors from three areas: the policy environment, the attitudes of governmental actors, and community atmosphere, in explaining observed variation in the adoption of climate change policies. 相似文献
260.
Pat Pridmore Liz Thomas Kirsten Havemann Jaime Sapag Lisa Wood 《Asia Europe Journal》2011,8(4):449-451