全文获取类型
收费全文 | 4035篇 |
免费 | 372篇 |
出版年
2023年 | 74篇 |
2022年 | 65篇 |
2021年 | 80篇 |
2020年 | 200篇 |
2019年 | 104篇 |
2018年 | 184篇 |
2017年 | 248篇 |
2016年 | 222篇 |
2015年 | 145篇 |
2014年 | 172篇 |
2013年 | 667篇 |
2012年 | 260篇 |
2011年 | 239篇 |
2010年 | 178篇 |
2009年 | 133篇 |
2008年 | 209篇 |
2007年 | 151篇 |
2006年 | 146篇 |
2005年 | 72篇 |
2004年 | 64篇 |
2003年 | 73篇 |
2002年 | 45篇 |
2001年 | 29篇 |
2000年 | 39篇 |
1999年 | 27篇 |
1998年 | 24篇 |
1997年 | 18篇 |
1996年 | 43篇 |
1995年 | 34篇 |
1994年 | 30篇 |
1993年 | 36篇 |
1992年 | 36篇 |
1991年 | 50篇 |
1990年 | 37篇 |
1989年 | 26篇 |
1988年 | 25篇 |
1987年 | 20篇 |
1986年 | 21篇 |
1985年 | 12篇 |
1984年 | 6篇 |
1982年 | 9篇 |
1981年 | 13篇 |
1980年 | 18篇 |
1979年 | 18篇 |
1978年 | 19篇 |
1977年 | 21篇 |
1971年 | 8篇 |
1968年 | 8篇 |
1966年 | 7篇 |
1965年 | 8篇 |
排序方式: 共有4407条查询结果,搜索用时 15 毫秒
1.
2.
3.
Philosophia - We can hear silence because silence, an absence of sound, causes our hearing of it. Advocating this position, Roy Sorensen puts to use his own theory of the direct perception of... 相似文献
4.
William Alex Pridemore PhD Adam Trahan MA Mitchell B. Chamlin PhD 《Suicide & life-threatening behavior》2009,39(6):659-670
There is substantial evidence of detrimental psychological sequelae following disasters, including terrorist attacks. The effect of these events on extreme responses such as suicide, however, is unclear. We tested competing hypotheses about such effects by employing autoregressive integrated moving average techniques to model the impact of September 11 and the Oklahoma City bombing on monthly suicide counts at the local, state, and national level. Unlike prior studies that provided conflicting evidence, rigorous time series techniques revealed no support for an increase or decrease in suicides following these events. We conclude that while terrorist attacks produce subsequent psychological morbidity and may affect self and collective efficacy well beyond their immediate impact, these effects are not strong enough to influence levels of suicide mortality. 相似文献
5.
6.
Collin L. Davidson MS LaRicka R. Wingate PhD Kathy A. Rasmussen BA Meredith L. Slish BA 《Suicide & life-threatening behavior》2009,39(5):499-507
The current study hypothesized that (1) hope would negatively predict burdensomeness, thwarted belongingness, and acquired capability to enact lethal injury; (2) hope would negatively predict suicidal ideation; and (3) the interpersonal suicide risk factors would predict suicidal ideation. Results indicated that hope negatively predicted burdensomeness and thwarted belongingness, but positively predicted acquired capability to enact suicide. Contrary to our second hypothesis, hope did not predict suicidal ideation, but interpersonal risk factors for suicide predicted suicidal ideation. Results are discussed in terms of implications for hope theory and Joiner's (2005) interpersonal risk factors for suicide, and for clinical practice. 相似文献
7.
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
8.
9.
Gábor L. Ambrus 《Zygon》2020,55(4):875-897
We are easily misguided as to the true nature of Facebook, and tend to treat it simply as a powerful technological instrument in the service of human intentions. We can, however, gain a better picture of it through recourse to the Jewish tradition of the golem, an image of human beings, created by them in a re-enactment of their own creation by God. It turns into a magic servant in modernity with an inherent dynamic running between its human and its subhuman characteristics. This dynamic is the main cause behind its becoming uncontrollable. In like manner, what is subhuman in Facebook serves its masters and functions under their total control, but also empowers Facebook's increasingly human operation, an algorithm-based capability which raises growing doubts about what counts as human. Facebook implies the crisis of humanity which coincides with the “death of God,” that is, the obsolescence of the idea of a divine creator. 相似文献
10.
The possibility that rats can navigate in the Morris water maze by reducing the difference between the memorized platform scene and the current sensory input was tested in nine blind rats. A computerized videosystem monitored the rats' movements in the pool and converted the rat-target distance into tones the frequency of which increased in 64 equal steps from 120 Hz at 128 cm to 7680 Hz at 0 cm. During 15 days of training to find a fixed platform position from different starting points (12 trials per day) average escape latencies decreased from 39.0 to 25.4 s. The performance significantly deteriorated when the acoustic distance signalization was omitted and/or when the target position was changed form trial to trial. It is concluded that blind rats solved the task by simultaneously employing search strategy based on position responses, mapping using acoustic background beacons, and distance reduction navigation. It is argued that the various strategies are additive and that their relative significance depends of the conditions of the experiment. 相似文献