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   2170篇
  免费   110篇
各国政治   143篇
工人农民   106篇
世界政治   216篇
外交国际关系   117篇
法律   1033篇
中国政治   12篇
政治理论   634篇
综合类   19篇
  2023年   11篇
  2022年   5篇
  2021年   19篇
  2020年   46篇
  2019年   56篇
  2018年   71篇
  2017年   91篇
  2016年   73篇
  2015年   58篇
  2014年   83篇
  2013年   332篇
  2012年   74篇
  2011年   99篇
  2010年   61篇
  2009年   79篇
  2008年   64篇
  2007年   85篇
  2006年   85篇
  2005年   86篇
  2004年   75篇
  2003年   87篇
  2002年   82篇
  2001年   42篇
  2000年   44篇
  1999年   38篇
  1998年   39篇
  1997年   39篇
  1996年   30篇
  1995年   35篇
  1994年   31篇
  1993年   21篇
  1992年   21篇
  1991年   16篇
  1990年   24篇
  1989年   14篇
  1988年   25篇
  1987年   16篇
  1986年   9篇
  1985年   18篇
  1984年   16篇
  1983年   12篇
  1982年   7篇
  1981年   9篇
  1980年   10篇
  1979年   5篇
  1978年   5篇
  1976年   7篇
  1973年   4篇
  1970年   3篇
  1967年   3篇
排序方式: 共有2280条查询结果,搜索用时 46 毫秒
901.
Pushed by the transition towards the knowledge economy, as well as several other change drivers, an ever-increasing number of knowledge intensive ventures are relying on operational knowledge intensity in order to generate value. Through their interaction with their varied stakeholders—from actors within their supply chains to educational and financial institutions—knowledge intensive enterprises are increasingly becoming a key component of regional economic stability. Within their complex environment, these organisations lack the support of suitable frameworks to inform their efforts to optimise, adapt and improve their underlying business processes in order to maximise the efficiency of their performance and pursue growth ambitions. This paper examines the distinct nature of knowledge intensive entrepreneurial ventures (KIEs) and the applicability of current business process improvement (BPI) frameworks to their setting. Finally, a KIE-oriented business process improvement framework is developed through an integrative adaptation of the concepts of knowledge intensity and knowledge management to the principles of business process redesign and re-engineering reported in existing literature. The proposed framework contributes to the existing literature in the subject of BPI modelling for knowledge intensive entrepreneurial ventures by addressing a distinct set of improvement concerns that this type of organisations face at a process level.  相似文献   
902.
Relatively little is known of either somnophilia or necrophilia in comparison to other more commonly presented sexual paraphilias. Despite the overt similarities between the two, somnophilia being characterised as an attraction to the sleeping/unconscious, and necrophilia being characterised as a sexual attraction to the dead, there has been little examination of their concurrence or relationship in a single person. A case is presented here of their relationship with directions for clinical and law enforcement awareness.  相似文献   
903.
As home visitation programs go to scale, numerous challenges are faced in implementation and quality assurance. This article describes the origins and implementation of Every Child Succeeds, a multisite home visitation program in southwestern Ohio and Northern Kentucky. In order to optimize quality assurance and generate new learning for the field, a Web-based system (eECS) was designed to systematically collect and use data. Continuous quality assurance procedures derived from business and industry have been established. Findings from data collection have documented outcomes, and have identified clinical needs that potentially undermine the impact of home visitation. An augmented module approach has been used to address these needs, and a program to treat maternal depression is described as an example of this approach. Challenges encountered are also discussed.  相似文献   
904.
The Tangled Web: Delinquency, Deception, and Parental Attachment   总被引:1,自引:0,他引:1  
Delinquent youth display weaker attachment to their parents than do other youth, but the reasons for this remain unclear. One explanation is that delinquent youth poison their relations with parents by lying to them about their friends, behavior, whereabouts, and more. Analysis of data from the National Longitudinal Study of Adolescent Health reveals that lying to parents is an exceptionally strong and robust correlate of delinquent behavior, and is associated with a variety of surreptitious behaviors – late bedtimes, hanging with friends, concealing whereabouts. Lying to parents appears to have a progressively negative impact on the parent-child bond, meaning that the well-established attachment/delinquency association is not solely a parent effect. Youth who lie to their parents do not appear to do so blithely, however. Compared to other youth, they hold themselves in lower regard and are more often depressed. Although parents are often angered by and distrustful of deceitful children, their children's fabrications may say less about their regard for their parents than about the strength of other loyalties.
Mark WarrEmail:
  相似文献   
905.
Fourier transform infrared (FTIR) chemical imaging allows the collection of fingerprint images from backgrounds that have traditionally posed problems for conventional fingerprint detection methods. In this work, the suitability of this technique for the imaging of fingerprints on a wider range of difficult surfaces (including polymer banknotes, various types of paper, and aluminum drink cans) has been tested. For each new surface, a systematic methodology was employed to optimize settings such as spectral resolution, number of scans, and pixel aggregation in order to reduce collection time and file-size without compromising spatial resolution and the quality of the final fingerprint image. The imaging of cyanoacrylate-fumed fingerprints on polymer banknotes has been improved, with shorter collection times for larger image areas. One-month-old fingerprints on polymer banknotes have been successfully fumed and imaged. It was also found that FTIR chemical imaging gives high quality images of cyanoacrylate-fumed fingerprints on aluminum drink cans, regardless of the printed background. Although visible and UV light sources do not yield fingerprint images of the same quality on difficult, nonporous backgrounds, in many cases they can be used to locate a fingerprint prior to higher quality imaging by the FTIR technique. Attempts to acquire FTIR images of fingerprints on paper-based porous surfaces that had been treated with established reagents such as ninhydrin were all unsuccessful due to the swamping effect of the cellulose constituents of the paper.  相似文献   
906.
ABSTRACT: Ignitable Liquid Absorbent (ILA), a commercial solid absorbent intended to assist fire scene investigators in sample location and collection, has been field tested in three separate room fires. The ability of the ILA to detect and absorb different amounts of gasoline, odorless paint thinner, and camp fuel on two different substrates after a full-scale burn was assessed against results from an accelerant detection canine and laboratory analysis using gas chromatography-mass spectrometry (GC-MS). The canine correctly alerted on most of the panels that contained an ignitable liquid after the fire, while the ILA indicator dye failed to indicate in the presence of gasoline and camp fuel. GC-MS results for ignitable liquid residue from each panel and from the ILA showed that ILA absorbed odorless paint thinner and camp fuel from most of the test panels, but failed to absorb gasoline from the panels on which gasoline was confirmed to be present.  相似文献   
907.
This study analyzed the records of 136 recently incarcerated capital murder offenders in the initial phase (M = 2.37 years, range = 6-40 months) of their life sentences in the Texas Department of Criminal Justice. Prevalence rates of institutional violence were inversely related to severity: potentially violent misconduct (36.8%), assaultive violations (14%), serious assaults (5.1%), and homicides (0%). Consistent with prior studies, factors correlated with assaultive misconduct included age (inversely), prior prison confinement, and concurrent robbery or burglary in the capital offense. A simplified Burgess scale entitled the Risk Assessment Scale for Prison-Capital (RASP-Cap) was moderately successful in identifying varying levels of improbability of committing violence-related misconduct however defined (AUC = .715-.766).  相似文献   
908.
Reliable identification of victims in mass graves is of humanitarian and human rights concern. Because mass graves in the former Yugoslavia usually contain an 'open' population of large numbers of unknown victims and therefore 'presumptive identifications' based on classical markers of identity are problematic, greater reliance is now made on blind matches between victim DNA and a database of donated blood DNA samples from family members of missing persons. Nevertheless, there will always remain a legal and social need to show good correspondence between a DNA-derived identification and classical markers of identity. Moreover, pathologists and anthropologists, who must continue to rely in much of their case work on classical methods, need to evaluate on an ongoing basis the goodness of fit between the two paradigms of identification. The Institute of Forensic Medicine and Laboratory for Anthropology in Belgrade participated in 2001 in the exhumation and identification of more than 300 bodies of Kosovar Albanians interred in two mass graves at Batajnica, near Belgrade, Serbia. Of these bodies, 136 were legally identified by the end of 2003 providing an opportunity for the forensic experts to evaluate their post-mortem findings of classical markers of identity. Sex and age at death of young to middle-aged adults were reliably determined but old adults were markedly under-aged. Stature was reconstructed reliably in 77% of cases. Dental status contributed little to identification efforts. In no case did classical markers of identity require rejection of the DNA-based identification. It is concluded that: sex determination from pelvic bones is very reliable, as are age at death estimates from pelvic and rib standards for young to middle-aged adults but that uncertainty intervals for age at death in older adults be broadened or refined by creation of local osteological standards.  相似文献   
909.
Despite an increasing literature on the decomposition of human remains, whether buried or exposed, it is important to recognise the role of specific microenvironments which can either trigger or delay the rate of decomposition. Recent casework in Northern England involving buried and partially buried human remains has demonstrated a need for a more detailed understanding of the effect of contrasting site conditions on cadaver decomposition and on the microenvironment created within the grave itself. Pigs (Sus scrofa) were used as body analogues in three inter-related taphonomy experiments to examine differential decomposition of buried human remains. They were buried at three contrasting field sites (pasture, moorland, and deciduous woodland) within a 15 km radius of the University of Bradford, West Yorkshire, UK. Changes to the buried body and the effect of these changes on hair and associated death-scene textile materials were monitored as was the microenvironment of the grave. At recovery, 6, 12 and 24 months post-burial, the extent of soft tissue decomposition was recorded and samples of fat and soil were collected for gas chromatography mass spectrometry (GCMS) analysis. The results of these studies demonstrated that (1) soil conditions at these three burial sites has a marked effect on the condition of the buried body but even within a single site variation can occur; (2) the process of soft tissue decomposition modifies the localised burial microenvironment in terms of microbiological load, pH, moisture and changes in redox status. These observations have widespread application for the investigation of clandestine burial and time since deposition, and in understanding changes within the burial microenvironment that may impact on biomaterials such as hair and other associated death scene materials.  相似文献   
910.
Over the past twenty years, Medicare has been transformed from a single-payer insurer into a hybrid of complementary public and private insurance arrangements. Despite creating ongoing controversy, these changes have resulted in an ironic and largely overlooked strategic potential: Medicare's evolving hybrid form makes it the most promising vehicle for overcoming the historical obstacles to universal health insurance in the United States. To make this surprising case, we first explore the distinctive political dynamics of programs that, like today's Medicare, are hybrids of public and private arrangements. We then consider how these political dynamics might circumvent past barriers to universal health insurance. Finally, we discuss the strengths and weaknesses of alternative pathways through which Medicare could be expanded to promote health security.  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