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   455篇
  免费   41篇
  国内免费   34篇
  2024年   3篇
  2023年   10篇
  2022年   42篇
  2021年   35篇
  2020年   50篇
  2019年   9篇
  2018年   42篇
  2017年   36篇
  2016年   37篇
  2015年   21篇
  2014年   32篇
  2013年   34篇
  2012年   4篇
  2011年   14篇
  2010年   4篇
  2009年   10篇
  2008年   14篇
  2007年   9篇
  2006年   17篇
  2005年   11篇
  2004年   22篇
  2003年   4篇
  2002年   3篇
  2001年   8篇
  2000年   2篇
  1999年   3篇
  1998年   1篇
  1997年   3篇
  1996年   1篇
  1995年   3篇
  1993年   1篇
  1992年   5篇
  1991年   4篇
  1990年   3篇
  1989年   2篇
  1988年   7篇
  1987年   2篇
  1986年   3篇
  1985年   3篇
  1984年   3篇
  1983年   3篇
  1982年   1篇
  1981年   4篇
  1980年   3篇
  1978年   1篇
  1976年   1篇
排序方式: 共有530条查询结果,搜索用时 31 毫秒
491.
Neighborhood violence is a persistent source of danger, stress, and other adverse outcomes for urban youth. We examined how 140 African American and Latino adolescents coped with neighborhood danger in low, medium, and high crime neighborhoods throughout Chicago. Participants reported using a range of coping strategies (measured via a modified version of the Ways of Coping Scale; R. S. Lazarus & S. Folkman, 1984). In low and medium crime rate areas, using confrontive strategies was significantly correlated with increased exposure to violence, and no strategies were associated with perceptions of safety. Coping strategies were associated with perceived safety to a substantial degree only in high crime neighborhoods, and none were associated with exposure to violence. A k means cluster analysis identified groups that differed in coping profiles and varied in rates of exposure to violence. Moderating effects of gender, ethnicity, and neighborhood were found for both person level and variable level analyses.  相似文献   
492.
Mass casualty attacks in recent years have demonstrated the need to include “evil intent” as a design consideration. Three recent actual or potential weapons of mass destruction (WMD) attacks did not involve nuclear bombs or other devices designed as weapons, but rather benign objects used with evil intent. Just as unplanned events such as hurricanes, earthquakes, fires, and user misuse have been codified into design requirements based on the likelihood and potential impact of the event, “evil intent” has to become part of the design process for buildings, vehicles, equipment, and other items. The endstate should be reasonable additions to existing codes and standards such that it is clear what is and is not designed for. In the absence of specific design guidance, professionals with appropriate expertise can assess potential for “evil intent” and provide recommendations to design out or warn against this potential harm to public safety, particularly when codified requirements are not present. An earlier version of this paper was presented at the “Ethics and Social Responsibility in Engineering and Technology” meeting, New Orleans, 2003. Author Note: Bart Kemper, PE, is the principal engineer for Kemper Imageering, Inc. A significant portion of his work has been involved in industrial equipment design, product design, and the design and analysis of different security devices as well as performing simulations, computer modelling, reliability studies, blast analyses, and FMEA analyses on commercial equipment, including marine, offshore, and industrial facilities. He is also a US Army Reserve captain in the Corps of Engineers and was mobilized and deployed overseas in February 2003 in support of Operation Iraqi Freedom as a member of the 412th Engineer Command, headquartered in Vicksburg, Mississippi. A significant portion of his duties involved reviewing intelligence, analyzing potential courses of action, and evaluating risks with regard to Iraqi and Coalition activities in the northern Iraqi oilfields as well as base camp design and infrastructure engineering. This paper is unclassified and has been cleared for publication.  相似文献   
493.
A variation of the ABAB experimental design was used to assess the impact of a verbal prompt on safety-belt use for those traveling by urban roads and highways in Spain. The personal prompt resulted in an increase (29.6%) in safety-belt use among drivers traveling on urban roads. This research shows that the impact of personal prompts can be generalized to cultures outside the United States.  相似文献   
494.
An in-vehicle information system (IVIS) was used to videotape drivers (N = 61) without their knowledge while driving 22 miles in normal traffic. The drivers were told that they were participating in a study of direction following and map reading. Two data-coding procedures were used to analyze videotapes. Safety-related behaviors were counted during consecutive 15-s intervals of a driving trial, and the occurrence of certain safety-related behaviors was assessed under critical conditions. These two methods of data coding were assessed for practicality, reliability, and sensitivity. Interobserver agreement for the five different driving behaviors ranged from 85% to 95%. Within-subject variability in safe driving was more pronounced among younger drivers and decreased as a function of age. Contrary to previous research that has relied on self-reports, driver risk taking did not vary significantly as a function of gender. These results are used to illustrate the capabilities of the technology introduced here to design and evaluate behavior-analytic interventions to increase safe driving.  相似文献   
495.
Community-based participatory research (CBPR) is increasingly being used to better understand and improve the health of diverse communities. A key strength of this research orientation is its adaptability to community contexts and characteristics. To date, however, few studies explicitly discuss adaptations made to CBPR principles and processes in response to community context and partners’ needs. Using data from our CBPR study, the San Francisco Chinatown Restaurant Worker Health and Safety Project, and drawing from literature on immigrant political incorporation, we examine the links between the contexts of the Chinese immigrant worker community, adaptations made by our collaborative, and study outcomes. In particular, we explore the concepts of contexts of reception and participatory starting points, which may be especially relevant for partnerships with immigrant communities whose members have historically had lower rates of civic and political participation in the US. We discuss contextual findings such as worker partner accounts of language barriers, economic and social marginalization, and civic skills and participation, as well as subsequent adaptations made by the partnership. We also describe the relative effectiveness of these adaptations in yielding equitable participation and building partners’ capacity. We conclude by sharing lessons learned and their implications for CBPR and partnerships with immigrant communities more broadly.  相似文献   
496.
The authors studied effects of healthy aging on 3 components of the internal force vector during static prehensile tasks. Young and older subjects held an instrumented handle using a 5-digit prismatic grasp under different digit configurations and external torques. Across digit configurations, older subjects showed larger internal normal (grip) and tangential (load-resisting) digit force components and larger internal moment of force. In contrast to earlier reports, safety margin values were not higher in the older subjects. The results show that the increased grip force in older persons is a specific example of a more general age-related problem reflected in the generation of large internal force vectors in prehensile tasks. It is possible that the higher internal forces increase the apparent stiffness of the hand+handle system and, hence, contribute to its stability. This strategy, however, may be maladaptive, energetically wasteful, and inefficient in ensuring safety of hand-held objects.  相似文献   
497.
This study investigated the extent to which the psychological conditions and job characteristics predicted work engagement amongst higher education employees (n?=?149, females?=?60%) from a South African University. The participants completed a variety of instruments on psychological conditions of work, job characteristics and work engagement viz; the Work Engagement Scale (WES), Psychological Meaningfulness Scale (PMS), Job Enrichment Scale (JES), Work-Role Fit Scale (W-RFS), Co-Worker Relations Scale (C-WRS), Psychological Availability Scale (PAS), Self-Consciousness Scale (SCS), Job Resources Scale (JRS), Outside Activities Scale (OAS), Psychological Safety Scale (PSS), Supervisory Relations Scale (SRS) and the Co-Worker Norms Scale (CWNS). Data analysis applied multiple regression to predict work engagement from psychological meaningfulness, psychological availability and job characteristics and also to determine the mediation effect of psychological condition of availability on the relationship between work engagement and job characteristics (resources). Findings suggest psychological meaningfulness to predict work engagement and to mediate the relationship between job characteristics and work engagement. Psychological resources for work engagement should emphasise a sense of meaningfulness as a resource for work participation.  相似文献   
498.
Functionalists about truth employ Ramsification to produce an implicit definition of the theoretical term true, but doing so requires determining that the theory introducing that term is itself true. A variety of putative dissolutions to this problem of epistemic circularity are shown to be unsatisfactory. One solution is offered on functionalists' behalf, though it has the upshot that they must tread on their anti-pluralist commitments.  相似文献   
499.
有创诊断和治疗,引起疼痛、精神紧张、恶心、呕吐等不适或痛苦,甚至发生休克及死亡.为减少患者的不适和痛苦,提高依从性和耐受力,保障诊治的顺利进行,用麻醉方法使患者的痛觉或(和)知觉暂时的消失.当今有创诊断和治疗在现代医疗和科学实验中已经被广泛地应用,麻醉安全性事件的发生率与日俱增.胰岛素抵抗(insulin resistance,IR)患者对麻醉的耐受性差,其药代动力学特点也与非IR患者有所不同,对IR患者实施安全麻醉一直是麻醉医生所关注的课题.  相似文献   
500.
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