全文获取类型
收费全文 | 27767篇 |
免费 | 378篇 |
国内免费 | 4篇 |
出版年
2023年 | 48篇 |
2022年 | 61篇 |
2021年 | 103篇 |
2020年 | 142篇 |
2019年 | 201篇 |
2018年 | 3671篇 |
2017年 | 3042篇 |
2016年 | 2469篇 |
2015年 | 391篇 |
2014年 | 334篇 |
2013年 | 1015篇 |
2012年 | 1007篇 |
2011年 | 2785篇 |
2010年 | 2697篇 |
2009年 | 1720篇 |
2008年 | 2051篇 |
2007年 | 2534篇 |
2006年 | 352篇 |
2005年 | 477篇 |
2004年 | 459篇 |
2003年 | 389篇 |
2002年 | 283篇 |
2001年 | 142篇 |
2000年 | 152篇 |
1999年 | 126篇 |
1998年 | 121篇 |
1997年 | 96篇 |
1996年 | 77篇 |
1995年 | 68篇 |
1994年 | 62篇 |
1993年 | 67篇 |
1992年 | 48篇 |
1991年 | 37篇 |
1990年 | 55篇 |
1989年 | 34篇 |
1988年 | 40篇 |
1987年 | 38篇 |
1986年 | 45篇 |
1985年 | 49篇 |
1984年 | 50篇 |
1983年 | 47篇 |
1982年 | 42篇 |
1981年 | 41篇 |
1980年 | 43篇 |
1979年 | 40篇 |
1978年 | 46篇 |
1977年 | 29篇 |
1976年 | 39篇 |
1975年 | 40篇 |
1974年 | 40篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
Population attributable risk (PAR) estimates have been used in suicide research to evaluate the impact of psychosocial and socioeconomic risk factors, including affective disorders, traumatic life events, and unemployment. A parallel concept of preventive fraction (PF), allowing for estimation of the impact of protective factors and effectiveness of preventive interventions, is practically unknown in suicidology. The study authors discuss the application of both concepts to suicide research and prevention, and review literature on the subject. Despite several methodological and conceptual limitations, both PAR and PF are valuable instruments to inform development and evaluation of suicide prevention programs. 相似文献
24.
25.
ABSTRACT The central claim is that Hornsby's argument that semantic knowledge is practical knowledge is based upon a false premise. I argue, contra Hornsby, that speakers do not voice their thoughts directly. Rather, our actions of voicing our thoughts are justified by decisions we make (albeit rapidly) about what words to use. Along the way, I raise doubts about other aspects of the thesis that semantic knowledge is practical knowledge. 相似文献
26.
27.
Noelle Yuen Naleen Andrade Linda Nahulu George Makini John F. McDermott George Danko Ronald Johnson Jane Waldron 《Suicide & life-threatening behavior》1996,26(1):27-36
Native Hawaiian high school students, N = 1779, were surveyed for symptoms of psycho-pathology and suicide attempts in the previous 6 months. Seventy-seven (4.3%) of the students reported making a suicide attempt. There were no significant differences in prevalence rates for males and females. Depression, anxiety, aggression, substance abuse symptoms, and low family support, but not peer support, were significantly correlated with suicide attempts. On logistic regression, depression, substance abuse, and family support independently predicted attempts. The lack of gender difference may indicate a cultural characteristic of the Hawaiian population that differentiates it from mainstream American populations but likens it to the Native American population. 相似文献
28.
Matthew J. Traxler Michael D. Bybee Martin J. Pickering 《The Quarterly Journal of Experimental Psychology Section A: Human Experimental Psychology》1997,50(3):481-497
An eye-tracking experiment investigated whether incremental interpretation applies to interclausal relationships. According to Millis and Just's (1994) delayed-integration hypothesis, interclausal relationships are not computed until the end of the second clause, because the processor needs to have two full propositions before integration can occur. We investigated the processing of causal and diagnostic sentences (Sweetser, 1990; Tversky & Kahneman, 1982) that contained the connective because . Previous research (Traxler, Sanford, Aked, & Moxey, 1997) has demonstrated that readers have greater difficulty processing diagnostic sentences than causal sentences. Our results indicated that difficulty processing diagnostic sentences occurred well before the end of the second clause. Thus comprehenders appear to compute interclausal relationships incrementally. 相似文献
29.
Cardiovascular reactivity to video game and mental arithmetic stressors was compared among three groups of men: aerobically trained mild hypertensives, untrained mild hypertensives, and a comparison group of untrained normotensives. Relative to the untrained hypertensives, the trained hypertensives reacted to the video game with marginally smaller systolic blood pressure and diastolic blood pressure, but there were no significant differences between these groups in reactivity during the mental arithmetic task. Comparisons between each hypertensive group and the normotensive group showed that blood pressure (BP) reactivity of normotensives during the video game was generally similar to that of trained hypertensives but smaller than that of untrained hypertensives. These results indicate that aerobic training, which has been found to reduce resting BP in mild hypertensives, may also exert a favorable impact in reducing cardiovascular reactivity of hypertensives during some stressful situations. 相似文献
30.
Modal primitivists hold that some modal truths are primitively true. They thus seem to face a special epistemological problem: how can primitive modal truths be known? The epistemological objection has not been adequately developed in the literature. I undertake to develop the objection, and then to argue that the best formulation of the epistemological objection targets all realists about modality, rather than the primitivist alone. Furthermore, the moves available to reductionists in response to the objection are also available to primitivists. I conclude by suggesting that extant theories of the epistemology of modality are not sensitive to the question of primitivism versus reductionism.
相似文献