全文获取类型
收费全文 | 2704篇 |
免费 | 143篇 |
专业分类
2847篇 |
出版年
2023年 | 17篇 |
2022年 | 12篇 |
2021年 | 34篇 |
2020年 | 68篇 |
2019年 | 69篇 |
2018年 | 87篇 |
2017年 | 80篇 |
2016年 | 92篇 |
2015年 | 79篇 |
2014年 | 77篇 |
2013年 | 295篇 |
2012年 | 146篇 |
2011年 | 133篇 |
2010年 | 77篇 |
2009年 | 64篇 |
2008年 | 129篇 |
2007年 | 140篇 |
2006年 | 112篇 |
2005年 | 105篇 |
2004年 | 101篇 |
2003年 | 95篇 |
2002年 | 88篇 |
2001年 | 42篇 |
2000年 | 38篇 |
1999年 | 37篇 |
1998年 | 32篇 |
1997年 | 33篇 |
1996年 | 32篇 |
1995年 | 31篇 |
1994年 | 32篇 |
1993年 | 30篇 |
1992年 | 30篇 |
1991年 | 23篇 |
1990年 | 27篇 |
1989年 | 28篇 |
1988年 | 23篇 |
1987年 | 21篇 |
1986年 | 26篇 |
1985年 | 21篇 |
1984年 | 20篇 |
1983年 | 18篇 |
1982年 | 32篇 |
1981年 | 24篇 |
1980年 | 14篇 |
1979年 | 20篇 |
1978年 | 17篇 |
1977年 | 13篇 |
1976年 | 17篇 |
1975年 | 13篇 |
1974年 | 16篇 |
排序方式: 共有2847条查询结果,搜索用时 15 毫秒
131.
The position sense of the tongue and aftereffects on the position sense subsequent to loading were directly investigated. Nine subjects judged the straightahead with the tongue before and after straining laterally with the tongue against the horizontal force induced by a 29.5-g weight. Two of these subjects also participated in the experiment after the surface of the tongue had been anesthetized. Prior loading of the tongue biased the subjects' subsequent judgment of the straight-ahead; following loading, the tongue was placed farther in the direction of the previous effort. The results are discussed with reference to postcontraction effects from experiments on loading the limb and eye. 相似文献
132.
Brian A. Gladue 《Aggressive behavior》1991,17(6):313-326
Aggressive behavioral characteristics were assessed in groups of men and women by a self-report instrument, the Aggression Inventory, in which adult males reported more physical and verbal aggression than did females. Furthermore, males had higher scores on measures of impulsiveness and lack of frustration tolerance than did females, while women were more likely to avoid confrontation. In a second study, groups of male and female homosexuals and heterosexuals completed this Aggression Inventory after having blood samples taken to assay resting levels of testosterone (T) and estradiol (E). Groups of subjects within each gender were closely matched in terms of age, education, and vocational interests. Women were matched for the same time in their menstrual cycle (early follicular phase). Among men, homosexuals were indistinguishable from heterosexuals on all measures of aggression. Lesbians did not differ from heterosexual women on any aggression subscale except physical aggression, in which the homosexual women had lower scores. T and E were positively correlated with several indices of aggressive behavioral characteristics in men but were negatively correlated with those same measures in women. 相似文献
133.
Current theories of gratitude suggest that individuals feel grateful when they perceive someone else to be responsible for a desired outcome. However, it is unclear whether individuals must also feel a lack of personal responsibility in order to feel gratitude. This paper provides evidence that in achievement contexts, without the belief that they are responsible for their success, individuals do not experience gratitude, even when they acknowledge the help they have received. In two studies, the more helpful participants thought an experimenter had been, the more grateful they felt, but only if they also spontaneously felt responsible for (Study 1) or were induced to feel responsible for (Study 2) their outcomes. 相似文献
134.
Despite its frequent use to assess effects of environmental and pharmacological variables on short-term memory, little is known about the development of delayed matching-to-sample (DMTS) performance. This study was designed to examine the dimensions and dynamics of DMTS performance development over a long period of exposure to provide a more secure foundation for assessing stability in future research. Six pigeons were exposed to a DMTS task with variable delays for 300 sessions (i.e., 18,000 total trials; 3,600 trials per retention interval). Percent-correct and log-d measures used to quantify the development of conditional stimulus control under the procedure generally and at each of five retention intervals (0, 2, 4, 8 and 16-s) individually revealed that high levels of accuracy developed relatively quickly under the shorter retention intervals, but increases in accuracy under the longer retention intervals sometimes were not observed until 100-150 sessions had passed, with some still increasing at Session 300. Analyses of errors suggested that retention intervals induced biases by shifting control from the sample stimulus to control by position, something that was predicted by observed response biases during initial training. These results suggest that although it may require a great deal of exposure to DMTS prior to obtaining asymptotic steady state, quantification of model parameters may help predict trends when extended exposure is not feasible. 相似文献
135.
Thomason-Sassi JL Iwata BA Neidert PL Roscoe EM 《Journal of applied behavior analysis》2011,44(1):51-67
Dependent variables in research on problem behavior typically are based on measures of response repetition, but these measures may be problematic when behavior poses high risk or when its occurrence terminates a session. We examined response latency as the index of behavior during assessment. In Experiment 1, we compared response rate and latency to the first response under acquisition and maintenance conditions. In Experiment 2, we compared data from existing functional analyses when graphed as rate versus latency. In Experiment 3, we compared results from pairs of independent functional analyses. Sessions in the first analysis were terminated following the first occurrence of behavior, whereas sessions in the second analysis lasted for 10 min. Results of all three studies showed an inverse relation between rate and latency, indicating that latency might be a useful measure of responding when repeated occurrences of behavior are undesirable or impractical to arrange. 相似文献
136.
Brian Brock 《International Journal of Systematic Theology》2001,3(3):257-279
Martin Heidegger's late thought on technology raises a potent set of observations regarding the relationship of technology and ontology. Oliver O'Donovan is shown to have similar concerns to Heidegger on this topic, concerns which he addresses from within a theological framework which places technological making within the guiding role of created order. Karl Barth's Church Dogmatics II/1 account of the perfections of God is applied to sharpen O'Donovan's account of natural knowledge, clarifying the relation between natural and redeemed understandings of the normativity of the form of matter. 相似文献
137.
A selective review of some recent theoretical developments in the field of close relationships is presented. We describe demographic developments reflecting flux in relationships and the family and what may be viewed as a revolution in gender relations and the family over the past three to four decades. Also reviewed are theories on the development, maintenance, and ending of relationships, as well as the “dark side" of closerelationships. We conclude that the close-relationships field is likely to continue to develop and prosper as people search for answers to daunting relationship problems. 相似文献
138.
Prior research has established the existence of racial differences in locus of control as well as a relationship between labor market experience and locus of control. This study extends this line of inquiry by examining the relationship between labor market discrimination and subsequent change in locus of control. Drawing on a national probability sample (N = 2857) of young men, multiple regression analysis was used to estimate the effect of labor market discrimination (over a 2-year period) on subsequent locus of control. The results indicate that perceptions of employment discrimination influence the level of externality among blacks, over and above racial identification. Blacks who view themselves as victims of employment discrimination experience twice the increase in externality as blacks reporting no awareness of discrimination. 相似文献
139.
Michael F. Steger Brian M. Hicks Todd B. Kashdan Robert F. Krueger Thomas J. Bouchard Jr. 《Journal of research in personality》2007
Virtually all human individual differences have been shown to be moderately heritable. Much of this research, however, focuses on measures of dysfunctional behavior and relatively fewer studies have focused on positive traits. The values in action (VIA) project is a comprehensive and ambitious classification of 24 positive traits, also known as character strengths (Peterson, C., & Seligman, M. E. P. (2004). Character strengths and virtues: A handbook and classification. Washington, DC: American Psychological Association), the majority of which have received no behavior genetic attention. Using a sample of 336 middle-aged twins drawn from the Minnesota Twin Registry who completed the VIA inventory of strengths, we detected significant genetic and non-shared environmental effects for 21 of 24 character strengths with little evidence of shared environmental contributions. Associations with a previously administered measure of normal personality found moderate phenotypic overlap and that genetic influences on personality traits could account for most, but not all, of the heritable variance in character strengths. 相似文献
140.
The purpose of this study was to address the attentional cost of sensorimotor coordination by determining if changes to the mechanical context of movement would influence the ability to attend and respond to an alternate stimulus. Nine right-handed participants performed rhythmic pronation and supination movements of the forearm in time with an auditory metronome. A secondary task, consisting of a pedal response to visual probe stimuli, was employed to infer the attentional cost of the coordination task. When the axis-of-rotation (AOR) was placed below the long axis of the forearm, the average time to react (RT) to the probe stimuli was greater for the supinate-on-the-beat condition than for the pronate-on-the-beat condition. Conversely, with the AOR above the forearm, RT for the pronate-on-the-beat pattern was greater than that for the supinate-on-the-beat pattern. Thus, changing the mechanical context of an upper limb coordination task altered the central processing cost required to maintain pattern stability. This finding provides further evidence that the attentional resources required to produce a particular movement are determined by the ease with which the action is executed by the sensorimotor system. 相似文献