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   2367篇
  免费   542篇
各国政治   108篇
工人农民   17篇
世界政治   50篇
外交国际关系   90篇
法律   1721篇
中国共产党   21篇
中国政治   68篇
政治理论   599篇
综合类   235篇
  2024年   1篇
  2023年   9篇
  2022年   8篇
  2021年   46篇
  2020年   71篇
  2019年   187篇
  2018年   173篇
  2017年   138篇
  2016年   169篇
  2015年   146篇
  2014年   158篇
  2013年   459篇
  2012年   240篇
  2011年   179篇
  2010年   115篇
  2009年   97篇
  2008年   140篇
  2007年   128篇
  2006年   103篇
  2005年   89篇
  2004年   61篇
  2003年   80篇
  2002年   38篇
  2001年   34篇
  2000年   12篇
  1999年   10篇
  1998年   4篇
  1997年   1篇
  1993年   1篇
  1992年   3篇
  1990年   3篇
  1989年   1篇
  1988年   2篇
  1987年   2篇
  1985年   1篇
排序方式: 共有2909条查询结果,搜索用时 46 毫秒
951.
This article investigates the dynamics of portfolio allocation within political parties to shed light on the patterns of conflict and cooperation between rival party factions. It provides a game‐theoretic model that helps in explaining differences in portfolio allocation due to alternative modes of party organisation or party system competitiveness. Focusing on party congresses to estimate the number, strength and policy positions of party factions, the Italian case is analysed by testing some hypotheses generated by the theoretical model. The results shown that, overall, spoils are shared in proportion to the strength of each faction, in line with the prediction of Gamson's Law. However, there are also some important deviations from this path. Rules that foster party leaders' autonomy in fact provide them with a higher degree of discretion that will be used to reward their followers and to ward off any credible and harmful threat to party unity. Indeed, strategic portfolio allocation might balance out a lower amount of policy payoffs and becomes a strategy to restrain minorities from breaking away, thus contributing to the preservation of party unity in highly competitive political systems.  相似文献   
952.
For Tasmanians accessing Government services has traditionally required visits to various Lead Agency locations, as service delivery was fragmented and bureaucratic. The Tasmanian Government adopted a customer‐focused approach implementing ‘Service Tasmania’ a One‐Stop‐Shop service delivery concept. This paper investigates what led to the success of this public service reform and in particular what change management practices were applied during the change effort. Ten common factors of successful change have been identified in the literature; these are explored determining their relevance throughout this initiative. Data were collected with semi‐structured interviews conducted with 63 staff plus senior management. Data were analysed using a grounded theory approach and open coding was applied during the first pass through the data to reach the initial codes identifying critical terms and generic key issues. Findings confirm that several management interventions were necessary to address resistance and conflict issues and keep the government reform project on track.  相似文献   
953.
In the UK the rules governing caretaker situations have historically been underspecified. The UK's constitutional traditions, such as prime ministerial discretion to time elections and its two‐party system, have in the past limited the frequency and duration of caretaker periods. However, the recently lengthened election timetable, new constraints on the executive introduced by the Fixed‐term Parliaments Act (2011), and a decline in the dominance of the two largest parties are raising the risk that the UK will experience caretaker periods more often and for longer stretches of time. In this paper, we offer an analysis of the UK's current caretaker provisions and conclude that the existing conventions are insufficiently detailed and can render such periods problematic and controversy‐prone. Important lessons, we suggest, can be learned from reforms in other Westminster systems, and from the caretaker rules of other countries.  相似文献   
954.
The concentrations of 3‐beta‐hydroxybutyrate (3HB) in femoral blood, urine, vitreous humor as well as pericardial and cerebrospinal fluids were retrospectively examined in a series of medico‐legal autopsies, which included cases of diabetic ketoacidosis, hypothermia fatalities without ethanol in blood, bodies presenting mild decompositional changes, and sudden deaths in chronic alcoholics. Similar increases in 3HB concentrations were observed in blood, vitreous, and pericardial fluid, irrespective of the cause of death, suggesting that pericardial fluid and vitreous can both be used as alternatives to blood for postmortem 3HB determination. Urine 3HB levels were higher than blood values in most cases. Cerebrospinal fluid 3HB levels were generally lower than concentrations in blood and proved to be diagnostic of underlying metabolic disturbances only when significant increases occurred.  相似文献   
955.
There is an implicit assumption of homogeneity across violent behaviors and offenders in the criminology literature. Arguing against this assumption, I draw on three distinct literatures [child abuse and neglect (CAN) and violence, violence and post‐traumatic stress disorder (PTSD), and CAN and PTSD] to provide a rationale for an examination of varieties of violent behaviors. I use data from my prospective cohort design study of the long‐term consequences of CAN to define three varieties of violent offenders using age of documented cases of CAN, onset of PTSD, and first violent arrest in a temporally correct manner [CAN → to violence, CAN → PTSD → violence (PTSD first), and CAN → violence → PTSD (violence first)], and a fourth variety, violence only. The results illustrate meaningful heterogeneity in violent behavior and different developmental patterns and characteristics. There are three major implications: First, programs and policies that target violence need to recognize the heterogeneity and move away from a “one‐size‐fits‐all” approach. Second, violence prevention policies and programs that target abused and neglected children are warranted, given the prominent role of CAN in the backgrounds of these violent offenders. Third, criminologists and others interested in violence need to attend to the role of PTSD, which is present in about one fifth (21 percent) of these violent offenders, and not relegate the study of these offenders to the psychiatric and psychological literatures.  相似文献   
956.
The effect of substrate interferences from high‐density polyethylene (HDPE) on the ability to associate an ignitable liquid residue with the corresponding liquid standard, using statistical procedures, is demonstrated. Gasoline, kerosene, and lighter fluid, at three different evaporation levels, were spiked onto HDPE and subsequently burned to generate simulated ignitable liquid residues (ILRs). Samples were extracted using a passive headspace procedure and analyzed by gas chromatography–mass spectrometry. The total ion chromatograms were subjected to data pretreatment procedures prior to principal components analysis and Pearson product moment correlation. Using the combination of these statistical procedures, simulated ILRs were successfully associated with the corresponding liquid type, despite the presence of compounds inherent to the HDPE substrate, as well as those resulting from pyrolysis of the substrate.  相似文献   
957.
A skeleton discovered in Grand Forks, North Dakota was purported to belong to Clelland “Clell” Miller, a James‐Younger gang member, who was killed during the Northfield Bank robbery on September 7, 1876. A 3‐D image from a computer tomography (CT) scan of the skull was obtained, and a craniofacial superimposition was conducted to determine if the skull could belong to Miller. The superimposition method used in this case was to overlay the CT image of the skull onto Miller's postmortem photograph. In addition to the craniofacial superimposition, the images were juxtaposed to compare similarities or differences in facial morphology between the skull and photograph. Superimposition methods can be used to exclude identifications; however, they should not be used as a conclusive method for identification. In this case, there were sufficient similarities between the skull and Miller's photograph; therefore, the skull could not be eliminated as possibly being that of Miller.  相似文献   
958.
Change in perspective between antemortem and postmortem imaging sessions (radiograph to radiograph and surface scan to radiograph) may cause different 2D renderings of the same osseous element complicating comparisons for identification. In this study, clavicle shape changes due to radiographic positioning and 3D laser scanning were examined in 20 right‐side specimens, as pertinent to chest radiograph comparisons. Results indicate substantial changes in clavicle form with short source‐to‐image receptor distance, elevation of the element from the image receptor, and movement of the element away from the center beam (10% mean square for shape). Although quantitative shape differences were small when the clavicle was in close opposition to the image receptor (3% mean square), important qualitative differences remained with large distances from the center beam (e.g., conoid tubercle presence/absence). The significance of these results for image superimposition and computer‐automated‐shape‐based searches of radiographic libraries to find matching candidates is discussed.  相似文献   
959.
Minimum postmortem interval (mPMI) can be estimated with preceding mean ambient temperature models that predict carrion taxon pre‐appearance interval. But accuracy has not been compared with using summary statistics (mean ± SD of taxon arrival/departure day, range, 95% CI). This study collected succession data from ten experimental and five control (infrequently sampled) pig carcasses over two summers (n = 2 experimental, n = 1 control per placement date). Linear and exponential preceding mean ambient temperature models for appearance and departure times were constructed for 17 taxa/developmental stages. There was minimal difference in linear or exponential model success, although arrival models were more often significant: 65% of linear arrival (r2 = 0.09–0.79) and exponential arrival models (r2 = 0.05–81.0) were significant, and 35% of linear departure (r2 = 0.0–0.71) and exponential departure models (r2 = 0.0–0.72) were significant. Performance of models and summary statistics for estimating mPMI was compared in two forensic cases. Only summary statistics produced accurate mPMI estimates.  相似文献   
960.
Synthetic tryptamines have gained popularity for their hallucinogenic properties, unscheduled status, and availability from “head shops” and through the internet. Here, we present a case of synthetic tryptamine‐induced delirium secondary to 5‐MeO‐DALT ingestion in a previously healthy young male. 5‐MeO‐DALT led to the hospitalization of our patient after ingestion of a standard dose, presenting with extreme agitation, tachycardia, diaphoresis, and combativeness leading to physical restraint and intravenous sedation. A search of PubMed, Ovid, and Google Scholar for keywords of “5‐MeO‐DALT,” “5‐methoxy‐N,N‐diallyltryptamine,” or “Lucy‐N‐Nate” found no case reports or clinical articles in the literature. Rapid emergence and commercialization of this novel synthetic tryptamine 5‐MeO‐DALT points to the importance of health care and forensic professionals keeping abreast of the latest drugs of abuse and their clinical features. The authors hope this report leads the way in disseminating the potential risks associated with unscheduled and unregulated substances, synthetic tryptamines such as 5‐MeO‐DALT in particular.  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