全文获取类型
收费全文 | 193532篇 |
免费 | 8364篇 |
国内免费 | 155篇 |
专业分类
202051篇 |
出版年
2020年 | 2808篇 |
2019年 | 3471篇 |
2018年 | 3844篇 |
2017年 | 4218篇 |
2016年 | 4858篇 |
2015年 | 3953篇 |
2014年 | 4820篇 |
2013年 | 23515篇 |
2012年 | 5356篇 |
2011年 | 4700篇 |
2010年 | 4239篇 |
2009年 | 4947篇 |
2008年 | 4720篇 |
2007年 | 4275篇 |
2006年 | 4664篇 |
2005年 | 4532篇 |
2004年 | 4082篇 |
2003年 | 3659篇 |
2002年 | 3485篇 |
2001年 | 4399篇 |
2000年 | 4152篇 |
1999年 | 3796篇 |
1998年 | 2932篇 |
1997年 | 2727篇 |
1996年 | 2637篇 |
1995年 | 2472篇 |
1994年 | 2447篇 |
1993年 | 2383篇 |
1992年 | 3130篇 |
1991年 | 2912篇 |
1990年 | 2799篇 |
1989年 | 2679篇 |
1988年 | 2634篇 |
1987年 | 2591篇 |
1986年 | 2625篇 |
1985年 | 2858篇 |
1984年 | 2789篇 |
1983年 | 2516篇 |
1982年 | 2463篇 |
1981年 | 2413篇 |
1980年 | 2248篇 |
1979年 | 2544篇 |
1978年 | 2369篇 |
1977年 | 2285篇 |
1976年 | 2093篇 |
1975年 | 2267篇 |
1974年 | 2402篇 |
1973年 | 2287篇 |
1972年 | 1849篇 |
1971年 | 1775篇 |
排序方式: 共有10000条查询结果,搜索用时 7 毫秒
821.
This article addresses the relationship between religious affiliation and a very specific form of firearms ownership, that is, handgun ownership. Literature is reviewed relative to explanations of gun ownership. A test of the hypothesized relationship between religious affiliation and handgun ownership demonstrated a statistically significant ( p < 0.03) association. Protestants were found to have a disproportionately high level of handgun ownership compared to other religious groups. Speculation for this finding is reviewed relative to other recent research on this topic. 相似文献
822.
823.
Gordon Halliday Ph.D. 《Journal of Contemporary Psychotherapy》1992,22(3):173-181
The concept of developmental amnesia is proposed to describe the impairment of normal memories during a person's school age life. One hundred psychotherapy patients were interviewed and the age of earliest memories ranged from 1–12 years, with a mode of 5 years. Memory was continuous for 53% of patients by 1st grade, while 18% reported life memory was still episodic at age 18 or later. Parental alcohol problems were associated with delay of continuous memories. 相似文献
824.
825.
826.
Tim Kasser M.A. 《Journal of Contemporary Psychotherapy》1992,22(1):51-65
Since valuing is a process grounded in the organizational tendency of human behavior, the characteristics of a highly valued object should reflect the experience of the individual who selects it. This research compared the favorite songs of fourteen individuals diagnosed with schizophrenia to their inner experience as assessed in a standard interview. Many relationships were revealed between the two, often pertaining to important issues identified in theories of schizophrenia. Results may have therapeutic applications and shed light on processes through which psychological difficulties persist. 相似文献
827.
R C Kessler K S Kendler A Heath M C Neale L J Eaves 《Journal of personality and social psychology》1992,62(2):257-272
A survey of 821 same-sex female twin pairs from a population-based registry assessed 8 dimensions of social support and social integration. Twin analyses documented significant common environmental influences on 5 of these 8 measures and significant genetic influences on 5 of the 8. A decomposition of the multiplicative association between support and a measure of stressful life experiences in predicting depressed mood--an association typically interpreted as providing evidence for a stress-buffering effect of social support--shows clearly that it is the environmental and genetic factors that cause support, rather than support itself, that buffer the effects of stress on mood in most cases. We discuss the implications of this result for future research on the relationship between social support and psychopathology. 相似文献
828.
Coordination of knowledge in communication: effects of speakers' assumptions about what others know.
Two pairs of studies examined effects of perspective taking in communication, using a 2-stage methodology that first obtained people's estimates of the recognizability to others of specific stimuli (public figures and everyday objects) and then examined the effects of these estimates on message formulation in a referential communication task. Ss were good at estimating stimulus identifiability but were biased in the direction of their own knowledge. The amount of information in a referring expression varied inversely with the perceived likelihood that addresses could identify the target stimulus. However, effects were less strong than anticipated. Although communicators do take others' knowledge into account, the extent to which they do so involves a trade-off with other sorts of information in the communicative situation. 相似文献
829.
The influence of information feedback on the learning of a multiple-degree-of-freedom activity, the overhand throw, was investigated. During learning, feedback was presented in the form of knowledge of results, knowledge of performance, knowledge of performance with attention-focusing cues, or knowledge of performance with error-correcting transitional information. Across 12 practice sessions, performance was assessed with respect to both throwing distance and throwing form. Subjects provided with knowledge of performance along with transitional information demonstrated significant gains in throwing distance, compared with subjects receiving knowledge of performance or knowledge of results alone. Movement form ratings followed the same trend. Providing learners with cues to focus their attention on the relevant aspects of knowledge of performance or directly providing transitional information was a better aid to the acquisition of throwing form than providing knowledge of results or knowledge of performance alone. These results support the hypothesis that knowledge of results may not be the most potent form of feedback in multiple-degree-of-freedom activities and that knowledge of performance, when combined with additional information, can lead to significant gains in skill acquisition. 相似文献
830.
Humans and monkeys show intermittent arm movements while tracking moving targets. This intermittency has been explained by postulating either a psychological refractory period after each movement and/or an error deadzone, an area surrounding the target within which movements are not initiated. We present a technique to detect and quantify the size of this deadzone, using a compensatory tracking paradigm that distinguishes it from a psychological refractory period. An artificial deadzone of variable size was added around a visual target displayed on a computer screen. While the subject was within this area, he received visual feedback that showed him to be directly on target. The presence of this artificial deadzone could affect tracking performance only if it exceeded the size of his intrinsic deadzone. Therefore, the size of artificial deadzone at which performance began to be affected revealed the size of the intrinsic deadzone. Measured at the subjects' eye, the deadzone was found to vary between 0.06 and 0.38 degrees, depending on the tracking task and viewing conditions; on the screen, this range was 1.3 mm to 3.3 mm. It increased with increasing speed of the target, with increasing viewing distance, and when the amplitude of the movement required was reduced. However, the deadzone size was not significantly correlated with the subjects' level of performance. We conclude that an intrinsic deadzone exists during compensatory tracking, and we suggest that its size is set by a cognitive process not simply related to the difficulty of the tracking task. 相似文献