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   2098篇
  免费   108篇
  国内免费   2篇
  2021年   30篇
  2020年   40篇
  2019年   49篇
  2018年   57篇
  2017年   54篇
  2016年   76篇
  2015年   43篇
  2014年   72篇
  2013年   234篇
  2012年   81篇
  2011年   98篇
  2010年   49篇
  2009年   64篇
  2008年   79篇
  2007年   73篇
  2006年   67篇
  2005年   55篇
  2004年   47篇
  2003年   62篇
  2002年   47篇
  2001年   41篇
  2000年   44篇
  1999年   32篇
  1998年   30篇
  1997年   36篇
  1996年   21篇
  1994年   20篇
  1993年   19篇
  1992年   30篇
  1991年   20篇
  1990年   22篇
  1989年   21篇
  1988年   23篇
  1987年   20篇
  1986年   18篇
  1985年   18篇
  1984年   26篇
  1983年   21篇
  1982年   25篇
  1981年   22篇
  1980年   17篇
  1979年   22篇
  1978年   20篇
  1977年   21篇
  1976年   17篇
  1975年   24篇
  1974年   22篇
  1973年   22篇
  1972年   17篇
  1968年   16篇
排序方式: 共有2208条查询结果,搜索用时 93 毫秒
221.
Recalling information involves the process of discriminating between relevant and irrelevant information stored in memory. Not infrequently, the relevant information needs to be selected from among a series of related possibilities. This is likely to be particularly problematic when the irrelevant possibilities not only are temporally or contextually appropriate, but also overlap semantically with the target or targets. Here, we investigate the extent to which purely perceptual features that discriminate between irrelevant and target material can be used to overcome the negative impact of contextual and semantic relatedness. Adopting a distraction paradigm, it is demonstrated that when distractors are interleaved with targets presented either visually (Experiment 1) or auditorily (Experiment 2), a within-modality semantic distraction effect occurs; semantically related distractors impact upon recall more than do unrelated distractors. In the semantically related condition, the number of intrusions in recall is reduced, while the number of correctly recalled targets is simultaneously increased by the presence of perceptual cues to relevance (color features in Experiment 1 or speaker’s gender in Experiment 2). However, as is demonstrated in Experiment 3, even presenting semantically related distractors in a language and a sensory modality (spoken Welsh) distinct from that of the targets (visual English) is insufficient to eliminate false recalls completely or to restore correct recall to levels seen with unrelated distractors . Together, the study shows how semantic and nonsemantic discriminability shape patterns of both erroneous and correct recall.  相似文献   
222.
Researchers have long known that boys are more likely to have deviant peers than are girls. Yet, little research has tried to explain why boys and girls differ in their decision to associate with deviant peers. With the salience of deviant peers well established as a robust predictor of delinquency, we address the question, are the predictors of association with deviant peers different for boys and girls? In our examination of family and community processes, individual effects, and peer group composition factors, we find that the predictors of association with deviant peers differ by gender. In addition, our findings suggest gender divergences in the causes of both deviant peer association and deviant peer pressure. We discuss the implications of our research for both theoretical development and appropriate model estimation.  相似文献   
223.
Although typically undertaken to improve aggregate sales force performance, the realignment of sales territories can be quite de-motivational to individual salespersons. Findings of two studies reported here demonstrate that salesperson motivation and performance can be positively influenced by the managerial actions taken during the implementation phase of a territory realignment. Actions based on expectancy theory were found to be more effective for salespeople whose territory realignment increased sales potential, and justice-based actions were more effective for salespersons experiencing a reduction in territory potential.  相似文献   
224.
Motivating the sales force to adopt and use sales force automation (SFA) technology remains an issue. If salespeople are not committed to the selling organization's technology strategies, customer alliances are hindered.

Survey data were collected from a national sales force before and after the introduction of an SFA application. The results of this study indicate that salesperson attitudes (Perceived Usefulness, Attitude Toward the New System, and Compatibility) have an impact on intention to use new SFA systems prior to implementation. However, Personal Innovativeness, Attitude Toward the New System, and Facilitating Conditions have more of an effect on infusion of new SFA systems.  相似文献   
225.
The authors served as Special Issue Guest Editors for this issue of JPSSM. In this introduction to the Special Issue, they discuss how the issue was conceived and produced, and express their gratitude to the many colleagues who worked to make the issue a success.  相似文献   
226.
Smoking in many Western societies has become a both moral aand health issue in recent years, but little is known about how smokers position themselves and regulate their behaviour in this context. In this article, we report the findings from a study investigating how smokers from an economically disadvantaged community in the East Midlands (UK) respond to concerns about the health impact of smoking on others. We conducted ten focus group (FG) discussions with mixed groups (by smoking status and gender; N?=?58 participants) covering a range of topics, including smoking norms, self-regulation, and smoking in diverse contexts. We transcribed all FG discussions before analysing the data using techniques from discourse anlysis. Smokers in general positioned themselves as socially responsible smokers and morally upstanding citizens. This position was bolstered in two main ways: ‘everyday accommodation’, whereby everyday efforts to accommodate the needs of non-smokers were referenced, and ‘taking a stand’, whereby proactive interventions to prevent smoking in (young) others were cited. We suggest that smoking cessation campaigns could usefully be informed by this ethic of care for others.  相似文献   
227.
Abstract

The microstructure of YBa2(Cu1?xCox)3O7?δ, prepared by the standard ceramic method, shows lamellar twin structures with decreasing spacings between twin walls with increasing Co content for x?0·02, developing into {110}-type cross-hatched ‘tweed’ modulation for x?0·02. Several wall junctions are found for x=0·02. The structural phase transition between macroscopically orthorhombic and tetragonal material occurs at x≈0·025; structural modulations (λ≈20Å) persist in the samples with high Co content (x>0·25). The modulations lead to a considerable broadening of the X-ray lines affected by orthorhombic splitting, and show maximum amplitude at the critical composition x≈0·025.  相似文献   
228.

The position of Dy in the unit cell of Bi2Sr2CaCu2Oy has been determined by a real-space method. This is compared with the reciprocal-space atom location by channelling-enhanced microanalysis (ALCHEMI) method.  相似文献   
229.
ObjectivesThere is growing evidence that mindfulness has positive consequences for both psychological and physical health in both clinical and non-clinical populations. The potential benefits of mindfulness underpin a range of therapeutic intervention approaches designed to increase mindfulness in both clinical and community contexts. Self-guided mindfulness-based interventions may be a way to increase access to the benefits of mindfulness. This study explored whether a brief, online, mindfulness-based intervention can increase mindfulness and reduce perceived stress and anxiety/depression symptoms within a student population.MethodOne hundred and four students were randomly allocated to either immediately start a two-week, self-guided, online, mindfulness-based intervention or a wait-list control. Measures of mindfulness, perceived stress and anxiety/depression were administered before and after the intervention period.ResultsIntention to treat analysis identified significant group by time interactions for mindfulness skills, perceived stress and anxiety/depression symptoms. Participation in the intervention was associated with significant improvements in all measured domains, where no significant changes on these measures were found for the control group.ConclusionsThis provides evidence in support of the feasibility and effectiveness of shorter self-guided mindfulness-based interventions. The limitations and implications of this study for clinical practice are discussed.  相似文献   
230.
ObjectiveThe objective of the present study is to build upon the existing literature examining the coaching context and how it relates to coaches' use of autonomy-supportive interpersonal behaviours (i.e. Stebbings, Taylor, Spray, & Ntoumanis, 2012) by identifying additional environmental factors and exploring the role of coach motivation.DesignAn academic model designed by Pelletier, Seguin-Levesque, and Legault (2002) to predict teacher motivation and autonomy-supportive styles in academic settings, was adapted to the coaching context.MethodsThe influence of pressure from above (sport administrations) and pressure from below (athlete motivation) on coach motivation and autonomy-supportive coaching behaviours was tested using structural equation modeling.ResultsResults support the fit of the model in a sport context.ConclusionsPressure from above, pressure from below, and coach motivation predict coaches’ reported use of autonomy-supportive behaviours.  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