全文获取类型
收费全文 | 3441篇 |
免费 | 166篇 |
国内免费 | 13篇 |
专业分类
3620篇 |
出版年
2023年 | 23篇 |
2022年 | 31篇 |
2021年 | 46篇 |
2020年 | 61篇 |
2019年 | 78篇 |
2018年 | 91篇 |
2017年 | 106篇 |
2016年 | 119篇 |
2015年 | 73篇 |
2014年 | 90篇 |
2013年 | 425篇 |
2012年 | 161篇 |
2011年 | 153篇 |
2010年 | 124篇 |
2009年 | 98篇 |
2008年 | 140篇 |
2007年 | 144篇 |
2006年 | 131篇 |
2005年 | 113篇 |
2004年 | 115篇 |
2003年 | 113篇 |
2002年 | 112篇 |
2001年 | 58篇 |
2000年 | 52篇 |
1999年 | 64篇 |
1998年 | 49篇 |
1997年 | 30篇 |
1996年 | 52篇 |
1995年 | 36篇 |
1994年 | 35篇 |
1993年 | 31篇 |
1992年 | 45篇 |
1991年 | 35篇 |
1990年 | 35篇 |
1989年 | 23篇 |
1988年 | 38篇 |
1987年 | 30篇 |
1986年 | 29篇 |
1985年 | 23篇 |
1984年 | 40篇 |
1983年 | 19篇 |
1982年 | 18篇 |
1981年 | 27篇 |
1980年 | 28篇 |
1979年 | 24篇 |
1978年 | 21篇 |
1976年 | 18篇 |
1973年 | 22篇 |
1972年 | 17篇 |
1967年 | 17篇 |
排序方式: 共有3620条查询结果,搜索用时 15 毫秒
1.
Kathleen Forcier Laura R Stroud George D Papandonatos Brian Hitsman Meredith Reiches Jenelle Krishnamoorthy Raymond Niaura 《Health psychology》2006,25(6):723-739
A meta-analysis of published studies with adult human participants was conducted to evaluate whether physical fitness attenuates cardiovascular reactivity and improves recovery from acute psychological stressors. Thirty-three studies met selection criteria; 18 were included in recovery analyses. Effect sizes and moderator influences were calculated by using meta-analysis software. A fixed effects model was fit initially; however, between-studies heterogeneity could not be explained even after inclusion of moderators. Therefore, to account for residual heterogeneity, a random effects model was estimated. Under this model, fit individuals showed significantly attenuated heart rate and systolic blood pressure reactivity and a trend toward attenuated diastolic blood pressure reactivity. Fit individuals also showed faster heart rate recovery, but there were no significant differences in systolic blood pressure or diastolic blood pressure recovery. No significant moderators emerged. Results have important implications for elucidating mechanisms underlying effects of fitness on cardiovascular disease and suggest that fitness may be an important confound in studies of stress reactivity. 相似文献
2.
3.
4.
5.
Cheryl Poche Paul Yoder Raymond Miltenberger 《Journal of applied behavior analysis》1988,21(3):253-261
This study compared the effectiveness of a videotape training program with other methods of teaching children self-protection to prevent child abduction. Subjects were kindergarten and first-grade students. Four experimental conditions were presented: videotape with behavior rehearsal, videotape only, a standard safety program, and no training. Acquisition of self-protective behaviors was measured at posttraining and follow-up by having confederate adults entice the children near their schools and homes. Results revealed that the videotape program with behavior rehearsal was highly effective in teaching children safe responses to potential abductors. The standard safety program was effective with fewer than half of the children. Three fourths of the children who received no training immediately agreed to go with the confederate suspects. The videotape program can be easily used with groups of young children in a classroom setting. 相似文献
6.
7.
Hierarchical classes: Model and data analysis 总被引:1,自引:0,他引:1
A discrete, categorical model and a corresponding data-analysis method are presented for two-way two-mode (objects × attributes) data arrays with 0, 1 entries. The model contains the following two basic components: a set-theoretical formulation of the relations among objects and attributes; a Boolean decomposition of the matrix. The set-theoretical formulation defines a subset of the possible decompositions as consistent with it. A general method for graphically representing the set-theoretical decomposition is described. The data-analysis algorithm, dubbed HICLAS, aims at recovering the underlying structure in a data matrix by minimizing the discrepancies between the data and the recovered structure. HICLAS is evaluated with a simulation study and two empirical applications.This research was supported in part by a grant from the Belgian NSF (NFWO) to Paul De Boeck and in part by NSF Grant BNS-83-01027 to Seymour Rosenberg. We thank Iven Van Mechelen for clarifying several aspects of the Boolean algebraic formulation of the model and Phipps Arabie for his comments on an earlier draft. 相似文献
8.
Summary Network models of semantic memory assume implicitly or explicitly that the degree of activation of a node is a monotonic function of the total amount of excitation reaching that node from all sources. For example, the activation level of the node representing apple should be greater if it is receiving excitation due to the activation of the nodes for fruit and pear than if only one of these neighboring nodes is activated. This notion was tested by presenting semantic primes 80 ms or 320 ms before a letter string (e.g., apple or ipple) requiring a lexical decision. The prime stimuli consisted of a pair of simultaneous items that were identical in the single prime condition (e.g., fruit/fruit or pear/pear) or different in the double prime condition (e.g., fruit/pear or pear/fruit), and were either related (target = apple) or unrelated (target = copper) to the target, or neutral. As predicted by the summation of semantic activation assumption of network models there was a larger priming effect (in the 320 ms SOA condition) following the simultaneous activation of two related nodes than following the activation of only one node.This research was supported by grants to the first author from the Natural Sciences and Engineering Research Council of Canada. 相似文献
9.
Beatrice De Gelder 《Argumentation》1988,2(1):77-87
This paper looks at the attribution of the ability to lie and not at lying or lies. It also departs from more familiar approaches by focussing on the appraisal of an ability and not on the ability in itself. We believe that this attribution perspective is required to bring out the cognitive and intentional basis of the ability to lie. 相似文献
10.
Objects likely to appear in a given real-world scene are frequently found to be easier to recognize. Two different sources of contextual information have been proposed as the basis for this effect: global scene background and individual companion objects. The present paper examines the relative importance of these two elements in explaining the context-sensitivity of object identification in full scenes. Specific sequences of object fixations were elicited during free scene exploration, while fixation times on designated target objects were recorded as a measure of ease of target identification. Episodic consistency between the target, the global scene background, and the object fixated just prior to the target (the prime), were manipulated orthogonally. Target fixation times were examined for effects of prime and background. Analyses show effects of both factors, which are modulated by the chronology and spatial extent of scene exploration. The results are discussed in terms of their implications for a model of visual object recognition in the context of real-world scenes. 相似文献