全文获取类型
收费全文 | 2951篇 |
免费 | 85篇 |
国内免费 | 2篇 |
出版年
2019年 | 28篇 |
2018年 | 42篇 |
2017年 | 56篇 |
2016年 | 62篇 |
2015年 | 37篇 |
2014年 | 47篇 |
2013年 | 348篇 |
2012年 | 89篇 |
2011年 | 93篇 |
2010年 | 52篇 |
2009年 | 54篇 |
2008年 | 77篇 |
2007年 | 70篇 |
2006年 | 85篇 |
2005年 | 94篇 |
2004年 | 82篇 |
2003年 | 72篇 |
2002年 | 78篇 |
2001年 | 40篇 |
2000年 | 40篇 |
1999年 | 46篇 |
1998年 | 59篇 |
1997年 | 37篇 |
1996年 | 47篇 |
1995年 | 41篇 |
1994年 | 35篇 |
1993年 | 40篇 |
1992年 | 35篇 |
1991年 | 40篇 |
1990年 | 38篇 |
1989年 | 46篇 |
1988年 | 41篇 |
1987年 | 39篇 |
1986年 | 35篇 |
1984年 | 49篇 |
1983年 | 41篇 |
1982年 | 52篇 |
1981年 | 42篇 |
1980年 | 44篇 |
1979年 | 49篇 |
1978年 | 48篇 |
1977年 | 39篇 |
1976年 | 43篇 |
1975年 | 35篇 |
1974年 | 47篇 |
1973年 | 41篇 |
1971年 | 31篇 |
1969年 | 38篇 |
1968年 | 28篇 |
1967年 | 28篇 |
排序方式: 共有3038条查询结果,搜索用时 15 毫秒
161.
Aggressive biting of an inanimate target by mice was studied. Males attacked the bite-target more frequently than females, but this difference disappeared after castration when the response rate of the males approached that of the females. Ovariectomizing the females had little effect on their bite-attack frequencies. Subsequent androgen injections restored the biting-attack frequency of the castrated males to preoperative levels but had little effect on the intact males. Estrogen had little effect on the response frequency of the females, whereas androgen produced a slight increase in their bite-attack frequency. Results indicate that androgen is critical for the maintenance of this aggressive response and that the single subject paradigm utilized in this study was a sensitive measure of aggressive tendencies in mice. 相似文献
162.
Past studies have not assessed the prevalence of emotional disturbances in Holocaust survivors seeking medical treatment in a family practice environment. The present study examined the prevalence of lifetime (the presence of symptomatology at any time) and current posttraumatic stress disorder (PTSD) symptoms, general anxiety, and depression in Holocaust survivors seeking medical treatment in a primary care setting. 20 of the 27 Holocaust survivors in our sample received a current diagnosis of PTSD and reported significant symptoms of depression and general anxiety. Although 74% of the survivors were currently diagnosed with PTSD, participants in this study had reported an overall decline in reexperiencing, hyperarousal, and overall PTSD symptoms but exhibited increased avoidance and numbing symptoms throughout the lifespan. These preliminary results suggest that removing avoidance as a defense mechanism during the course of psychotherapy may leave these survivors without an adequate way for coping with their trauma, subsequently increasing their vulnerability to psychopathology. Implications for psychological interventions are provided. 相似文献
163.
164.
Rainbolt G 《Journal of social philosophy》2002,33(1):1-8
In a recent issue of this journal, Francis Beckwith's "The Ethics of Referral Kickbacks and Self-Referral and the HMO Physician as Gatekeeper: An Ethical Analysis" provided an admirably provocative defense of the claim that Health Maintenance Organization (HMO) physician gatekeepers are morally indistinguishable from physician referral kickbacks and self-referrals. Here I will argue that Beckwith's defense is weak. I will also make some tentative suggestions about approaching the issue of physician conflicts of interest. 相似文献
165.
The effects of regions with local linear perspective on judgments of the depth separation between two objects in a scene were investigated for scenes consisting of a ground plane, a quadrilateral region, and two poles separated in depth. The poles were either inside or outside the region. Two types of displays were used: motion-parallax dot displays, and a still photograph of a real scene on which computer-generated regions and objects were superimposed. Judged depth separations were greater for regions with greater linear perspective, both for objects inside and outside the region. In most cases, the effect of the region's shape was reduced for objects outside the region. Some systematic differences were found between the two types of displays. For example, adding a region with any shape increased judged depth in motion-parallax displays, but only high-perspective regions increased judged depth in real-scene displays. We conclude that depth information present in local regions affects perceived depth within the region, and that these effects propagate, to a lesser degree, outside the region. 相似文献
166.
Mandler G 《Memory (Hove, England)》2002,10(5-6):333-338
The psychology of thought and memory has historically been concerned with a struggle between associationism and its opponents. Organisation theory--in part an offspring of Gestalt concepts--has been the most successful and vocal of these contenders. The levels-of-processing framework has been a part of the effort to overcome associationist predilections. Aspects of principles of organisation and of the recent history of organisation theory are presented, followed by an analysis of the levels-of-processing approach in terms of organisational concepts. 相似文献
167.
George W. Harris 《Ethical Theory and Moral Practice》2002,5(3):271-286
The problem of pessimism is the secular analogue to the evidential problem of evil facing traditional theism. The traditional theist must argue two things: that the evidence shows that this is on balance a good world and that it is the best possible world. Though the secular optimist who advocates any form of secular moral theory need not argue that the current and future world will likely be the best possible world, she nonetheless must argue that were there a clean solution to the problem of current and future suffering in which all sentient life could be instantly and painlessly eliminated, we would have reasons not to employ the clean solution because the future promises to bring on balance a good world in which the evil of human and animal suffering is outweighed by whatever is good in the world. Pessimism is the view that the evidence argues against secular optimism. It is argued here that it is anything but clear that secular optimism is warranted when viewed from an impersonal point of view. The problem is then evaluated from the personal point of view in which a form of personal optimism is defended even in the face of impersonal pessimism. 相似文献
168.
Volume Contents
Volume Contents 相似文献169.
George MS Nahas Z Bohning DE Lomarev M Denslow S Osenbach R Ballenger JC 《CNS spectrums》2000,5(11):43-52
Although the vagus nerve has traditionally been considered to perform efferent functions, in reality it performs significant afferent functions as well, carrying information from the body, head, and neck to the brain. Preliminary studies examining this afferent activity led to the theory that vagus nerve stimulation (VNS) could successfully control seizure activity in persons who are refractory to antiepileptic medications. Unlike other forms of brain stimulation, VNS is unable to directly stimulate multiple discrete areas of the brain; however, through several pathways, it is able to relay sensory information to higher brain regions. An implantable VNS device known as the VNSTM NeuroCybernetic Prosthesis (NCP) System has been used in approximately 9,000 epilepsy patients in Europe and the United States since 1994. The implant has reduced seizure frequency by an average of 25% to 30%, with minimal side effects. Studies underway are also showing some degree of success in the management of treatment-refractory depression. The future efficacy of the implantable system in other disorders may depend on whether the implant can be more precisely focused to affect different brain regions. Research in this area is underway. 相似文献
170.
Pothos EM Bailey TM 《Journal of experimental psychology. Learning, memory, and cognition》2000,26(4):847-862
The authors examine the role of similarity in artificial grammar learning (AGL; A. S. Reber, 1989). A standard finite-state language was used to create stimuli that were arrangements of embedded geometric shapes (Experiment 1), connected lines (Experiment 2), and sequences of shapes (Experiment 3). Main effects for well-known predictors from the literature (grammaticality, associative global and anchor chunk strength, novel global and anchor chunk strength, length of items, and edit distance) were observed, thus replicating previous work. However, the authors extend previous research by using a widely known similarity-based exemplar model of categorization (the generalized context model; R. M. Nosofsky, 1989) to fit grammaticality judgments, by nested regression analyses. The results suggest that any explanation of AGL that is based on the existing theories is incomplete without a similarity process as well. Also, the results provide a foundation for further interpreting AGL in the wider context of categorization research. 相似文献