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   9275篇
  免费   446篇
  9721篇
  2023年   80篇
  2022年   68篇
  2021年   119篇
  2020年   188篇
  2019年   221篇
  2018年   294篇
  2017年   290篇
  2016年   365篇
  2015年   255篇
  2014年   253篇
  2013年   1060篇
  2012年   454篇
  2011年   540篇
  2010年   317篇
  2009年   350篇
  2008年   423篇
  2007年   427篇
  2006年   353篇
  2005年   311篇
  2004年   348篇
  2003年   353篇
  2002年   293篇
  2001年   183篇
  2000年   179篇
  1999年   158篇
  1998年   146篇
  1997年   115篇
  1996年   100篇
  1995年   99篇
  1994年   106篇
  1993年   69篇
  1992年   108篇
  1991年   66篇
  1990年   96篇
  1989年   74篇
  1988年   60篇
  1987年   58篇
  1986年   65篇
  1985年   66篇
  1984年   55篇
  1983年   69篇
  1982年   57篇
  1981年   42篇
  1980年   37篇
  1979年   54篇
  1978年   55篇
  1977年   33篇
  1976年   30篇
  1974年   19篇
  1972年   23篇
排序方式: 共有9721条查询结果,搜索用时 0 毫秒
241.
Bas C. van Fraassen 《Topoi》2006,25(1-2):123-127
Looking back from 2049 over one-hundred and fifty years of philosophy, a student's essay reveals what became of rival strands in Western philosophy – with a sidelong glance at the special Topoi issue on the theme “Philosophy: What is to be Done?” that was published almost half a century earlier.  相似文献   
242.
Children of 8 and 11 years were assessed in two experiments for their sensitivity to textual anomaly. In Experiment 1, subjects read stories containing two target lines, one appropriate and the other anomalous in relation to previously given information. Both age groups read the anomalous line more slowly than the appropriate line, but in a subsequent test of comprehension monitoring, the older group was more likely than the younger group to pick out the anomalous line as not fitting in with the rest of the story. Experiment 2 produced similar results: both 8- and 11-year-old children read an anomalous line more slowly, but 11-year-olds were more likely than 8-year-olds to cite the anomalous line or part of it when questioned about the possible presence of a line that did not fit in with the rest of the story. The results indicate that an age change in comprehension monitoring as indexed by citation or selection of a textual anomaly need not be contingent upon a parallel age change in constructive processing as indexed by modulation of reading rate.  相似文献   
243.
A linear utility model is introduced for optimal selection when several subpopulations of applicants are to be distinguished. Using this model, procedures are described for obtaining optimal cutting scores in subpopulations in quota-free as well as quota-restricted selection situations. The cutting scores are optimal in the sense that they maximize the overall expected utility of the selection process. The procedures are demonstrated with empirical data.  相似文献   
244.
This paper reviews the literature on performance on standard neuropsychological tests among individuals with posttraumatic stress disorder (PTSD). Of 19 studies, 16 reported impairment of attention or immediate memory (or both); however, most of these studies included PTSD patients with significant psychiatric comorbidity, so that the extent to which the observed deficits are specifically attributable to PTSD remains unclear. Other potential confounds, including medical illness, substance abuse, and motivational factors, further preclude definitive conclusions at present. Results of structural and functional neuroimaging studies of PTSD are also summarized. Two studies have reported correlations between hippocampal volume and cognitive findings in PTSD patients; functional studies have indicated specific findings in limbic regions, although the relationship of these results to neuropsychological performance remains to be explored.  相似文献   
245.
Clinical experience with older adults shows that many will experience PTSD symptoms in older adulthood because of trauma exposure early in life. Some of these patients struggled with PTSD in the distant past and remained symptomfree for decades only to have a recurrence of PTSD in late life. This paper outlines a cognitive aging explanation for the recurrence of PTSD. It is proposed that the age-related decreases in attention make the intrusion of trauma-related memories more likely. The increase in intrusive memories, combined with age-related decreases in working memory, explicit memory, and prospective memory, increases the subjective distress associated with the memories and results in a recurrence of PTSD.  相似文献   
246.
247.
Advocates of an environmental ethic frequently claim that what makes an ethical theory truly and uniquely environmental is its commitment to the principle that environmental wholes such as species, ecosystems, and biotic communities are morally considerable. The prevailing view is that our primary duty towards these wholes is to respect their integrity, stability, and beauty, and that the best way to do this is to leave them alone, not interfere with them, and let nature follow its own course. But is that correct? Why should be refrain from interfering with nature? There are two ways an environmentalist might try to justify an exceptionaless, prima facie principle of noninterference. First, she might claim that there is a contingent but universal connection between human interference and ecosystemic harm. There is also an epistemic variant of this view. When faced with a decision concerning whether to interfere with an ecosystem, there will always be overwhelming reasons for thinking that interference will be harmful, regardless of the specific circumstances. Send, there might be some conceptual connection between interference and harm to ecosystems. For example, if the well-being of an ecosystem is identified with its wildness, and wildness is understood as the absence of human intervention or manipulation, then any human interference necessarily detracts from an ecosystem's wildness and thereby has a detrimental effect on its well-being. In this paper I examine these justifications in detail and argue that none can support an exceptionaless principle of noninterference.  相似文献   
248.
This study, using secondary data analysis, examined prospectively a mediation model of the relationship between acculturation and problem behavior proneness among 330 Hispanic children and adolescents from an urban school district in the southwest region of the United States. Acculturation was predicted to have an indirect, but positive, relationship to problem behavior proneness through parental involvement and self-esteem. The results partially supported the model and indicated that parental involvement, but not self-esteem, played a significant mediational role in children's problem behavior proneness. The individual indicators of problem behavior proneness among Hispanic youth were significantly interrelated, which is consistent with problem behavior theory as conceptualized by R. Jessor (1984) and R. Jessor and S. L. Jessor (1977). Findings from this study provide implications for future research and intervention designs.  相似文献   
249.
Four actors were requested to perform Sartre's No Exit after a retention interval of more than 5 months. Their recall of the play was studied either with the spatial and visual contextual cues normally available during a performance or without such cues. Total recall was still considerable, equalling 85%. The number of paraphrases of, and inferences on, the original text was however quite large (32%), suggesting that the actors had learned their lines according to their meaning rather than as a result of rote memorisation. The context manipulation showed that actors' recall is facilitated by the availability of spatial-visual information, but only to a limited extent. The relative importance of textual and contextual cues in the long-term retention of a play is discussed.  相似文献   
250.
Data from a nationally representative sample of 5,238 U.S. adults were used to examine the extent to which physical assault victimization was associated with suicidal ideation or behavior (SIB). The results from multivariable logistic regression analyses indicate that physical assault victimization was positively associated with SIB after adjusting for sociodemographic characteristics and alcohol use (OR = 3.6; 95% CI = 2.4-5.5). Those who were injured during the most recent physical assault (OR = 2.7; 95% CI = 1.2-6.0) and those who were assaulted by a relative (OR = 3.4; 95% CI= 1.0-11.0) or intimate partner (OR = 7.7; 95% CI = 2.7-22.5) were significantly more like to report SIB than victims who were not injured or were assaulted by a stranger. Also, those who were victimized but not injured (OR = 5.6; 95% CI = 3.8-8.2) and those who were victimized by a stranger (OR = 2.9; 95% CI = 1.4-6.0) were more likely to report SIB than non-victims. These results highlight the need for legal, medical, mental health, and social service providers to address the co-occurrence of violent victimization and suicidal ideation, particularly, but not exclusively, victimization by family members and intimates.  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