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   2680篇
  免费   558篇
  国内免费   207篇
  2024年   4篇
  2023年   43篇
  2022年   56篇
  2021年   80篇
  2020年   165篇
  2019年   179篇
  2018年   167篇
  2017年   200篇
  2016年   188篇
  2015年   160篇
  2014年   164篇
  2013年   592篇
  2012年   89篇
  2011年   148篇
  2010年   82篇
  2009年   122篇
  2008年   117篇
  2007年   115篇
  2006年   81篇
  2005年   77篇
  2004年   66篇
  2003年   60篇
  2002年   45篇
  2001年   35篇
  2000年   34篇
  1999年   23篇
  1998年   19篇
  1997年   23篇
  1996年   15篇
  1995年   19篇
  1994年   15篇
  1993年   20篇
  1992年   13篇
  1991年   13篇
  1990年   8篇
  1989年   14篇
  1988年   9篇
  1987年   8篇
  1986年   12篇
  1985年   16篇
  1984年   13篇
  1983年   7篇
  1982年   10篇
  1981年   14篇
  1980年   14篇
  1979年   17篇
  1978年   16篇
  1977年   29篇
  1976年   17篇
  1975年   12篇
排序方式: 共有3445条查询结果,搜索用时 15 毫秒
281.
探讨早期目标血糖管理对严重脓毒症患者HMGB1变化的影响.严重脓毒症患者随机分为血糖控制A(4.4mmol/L~6.1mmol/L)、B(6.2mmol/L~8.3mmol/L)、C(8.4mmol/L~10.0mmol/L)三组.给予早期目标血糖管理,入ICU后0d、1d、3d、5d、7d采血测TNF-α、HMGB1浓度.三组TNF-α、HMGB1浓度及APACHEⅡ评分均呈下降趋势,A组HMGB1浓度及APACHEⅡ评分在第7d较B、C组明显降低(P<0.05).A组28d病死率较B、C组降低(P>0.05).严重脓毒症患者在早期目标血糖管理下,显著降低HMGB1浓度,降低病死率和改善预后,HMGB1可用来评价脓毒症的严重程度及预后.  相似文献   
282.
目前国内控烟文献从人群吸烟状况及吸烟影响因素、控烟干预策略及其效果、控烟能力等多角度,探讨了我国的烟草控制问题.在综合已有有效地控烟策略基础上,提出加强控烟教育和宣传、发挥医务人员在控烟中的表率作用、综合使用各种措施控烟等针对性建议,对中国长期有效的控烟具有深远意义.  相似文献   
283.
In psychology, deception is commonly used to increase experimental control. Yet, its use has provoked concerns that it raises participants' suspicions, prompts second-guessing of experimenters' true intentions, and ultimately distorts behavior and endangers the control it is meant to achieve. Over time, these concerns regarding the methodological costs of the use of deception have been subjected to empirical analysis. We review the evidence stemming from these studies.  相似文献   
284.
This paper reports an experiment designed to investigate the potential influence of prior acts of self-control on subsequent prospective memory performance. College undergraduates (n = 146) performed either a cognitively depleting initial task (e.g., mostly incongruent Stroop task) or a less resource-consuming version of that task (e.g., all congruent Stroop task). Subsequently, participants completed a prospective memory task that required attentionally demanding monitoring processes. The results demonstrated that prior acts of self-control do not impair the ability to execute a future intention in college-aged adults. We conceptually replicated these results in three additional depletion and prospective memory experiments. This research extends a growing number of studies demonstrating the boundary conditions of the resource depletion effect in cognitive tasks.  相似文献   
285.
We looked at whether sense of identity persists in patients with Alzheimer’s disease (AD) and if its profile remains the same between two examinations. A specifically designed protocol was administered to 16 AD patients in the mild to severe stages of dementia and to 16 matched healthy controls, both living in the same institution. We showed that sense of identity was broadly preserved in AD patients. The patterns of their responses were similar to those of controls, and remained consistent over a two-week period. However, some qualitative characteristics of sense of identity in AD patients differed significantly from those of controls, suggesting that AD patients may not be able to update their self-knowledge, probably because of their episodic memory deficit. These results are discussed in the light of both current models of the self and philosophical concepts such as sameness and selfhood.  相似文献   
286.
This study investigated cultural variations in perceived control over personal goals in Russian and American college students. Several appraisal dimensions of personal goals were studied including goals’ importance, their attainability, and sources of control over goal attainment, such as self, others, luck, and fate. The association between assimilative (tenacious goal pursuit) and accommodative (flexible goal adjustment) control strategies and perceived attainability of goals was also examined. The results indicated that both Russian and American students gave higher priority to work‐ and education‐related goals and lower priority to the familial goal. In both samples, the familial goal was the most influenced and health was the least influenced by luck/chance and fate. Overall, American students were more optimistic about the perceived probability to attain their goals, which may be affected by a cultural tendency for self‐enhancement and positive outlook. Russian students had a stronger belief in control by luck/chance and fate over personal goals, which coincides with a less agentic orientation of Russian culture. Regardless of culture and goal content, goal importance was associated with greater perceived success in goal attainment. However, control strategies (assimilative and accommodative) as well as internal control differentially predicted perceived attainability of goals depending on the goals’ content. For both Russians and Americans, perceived attainability of education‐related goals was associated with assimilative strategies and internal control; leisure was associated with accommodative strategies and health‐related goals were associated with internal control. Characteristics of cultural contexts accountable for crosscultural differences in perceived control over personal goals are discussed.  相似文献   
287.
This paper investigates the association between perceptions of broader changes in the social‐ecological context and individuals’ subjective well‐being (SWB). Macro‐level societal changes such as globalization or demographic change give rise to new demands for individual functioning at work and/or in the family. Such new demands associated with social change are stressful and likely to be related to lower levels of SWB. Being active agents, individuals attempt to deal with social change and its increasing demands to protect their SWB. The present study investigates which kinds of control strategies are most effective in protecting one's SWB. Specifically, we predicted that control strategies of goal engagement will be most effective under conditions of perceived high control, and control strategies of goal disengagement will be most effective under conditions of perceived low control. In a large sample of 2537 German adults, work‐ and family‐related demands associated with social change were found to be negatively linked to SWB. Moreover and in line with the motivational theory of lifespan development, control strategies of goal engagement and disengagement were beneficial for SWB to the extent that they matched the perceived control of the demands associated with social change.  相似文献   
288.
Past research has consistently found that people are likely to do worse on high‐level cognitive tasks after exerting self‐control on previous actions. However, little has been unraveled about to what extent ego depletion affects subsequent prospective memory. Drawing upon the self‐control strength model and the relationship between self‐control resources and executive control, this study proposes that the initial actions of self‐control may undermine subsequent event‐based prospective memory (EBPM). Ego depletion was manipulated through watching a video requiring visual attention (Experiment 1) or completing an incongruent Stroop task (Experiment 2). Participants were then tested on EBPM embedded in an ongoing task. As predicted, the results showed that after ruling out possible intervening variables (e.g. mood, focal and nonfocal cues, and characteristics of ongoing task and ego depletion task), participants in the high‐depletion condition performed significantly worse on EBPM than those in the low‐depletion condition. The results suggested that the effect of ego depletion on EBPM was mainly due to an impaired prospective component rather than to a retrospective component.  相似文献   
289.
The purpose of this study was to examine links between parenting dimensions (authoritative parenting, psychological control, and parental authority) and adolescent wellbeing (self‐esteem, autonomy, and peer attachments) as mediated by parent–teen attachment, among Chinese families. The sample included 298 Chinese adolescents, ages 15–18 years (M age = 16.36, SD = .68; 60% female). The mediation model was examined using path analyses (one model with parental authority as overprotection, and one with it as perceived behavioral control). To improve model fit a direct path was added from authoritative parenting to autonomy. Authoritative parenting was positively predictive of attachment, while psychological control and overprotection (but not behavioral control) were negative predictors. In turn, adolescent–parent attachment was positively related to the three outcomes. Lastly, the model paths did not differ by adolescent gender. These findings suggest that parenting behaviors may play a crucial role in adolescent social behaviors and wellbeing via adolescent–parent attachment.  相似文献   
290.
The distinction between minimal self and narrative self has gained ground in recent discussions of selfhood. In this article, this distinction is reassessed by analysing Zahavi and Gallagher’s account of selfhood and supplementing it with Husserl’s concept of person. I argue that Zahavi and Gallagher offer two compatible and complementary notions of self. Nevertheless, the relationship between minimal self and narrative self requires further clarification. Especially the embeddedness of self, the interplay between passivity and activity, and the problems of uniqueness and persistence are better understood with Husserl’s analysis of person and its central concepts of position-taking, habitualities, and overall style. The embeddedness of self is elucidated by outlining how person is related to its environment, to other people, and to its past. This relational notion of self is both passively constituted and actively shaped: person mediates between minimal self characterized by perspectival ownership and narrative self based on authorship.  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