全文获取类型
收费全文 | 46640篇 |
免费 | 1914篇 |
国内免费 | 19篇 |
专业分类
48573篇 |
出版年
2020年 | 539篇 |
2019年 | 664篇 |
2018年 | 938篇 |
2017年 | 984篇 |
2016年 | 1008篇 |
2015年 | 699篇 |
2014年 | 852篇 |
2013年 | 3598篇 |
2012年 | 1528篇 |
2011年 | 1549篇 |
2010年 | 992篇 |
2009年 | 921篇 |
2008年 | 1380篇 |
2007年 | 1360篇 |
2006年 | 1212篇 |
2005年 | 1068篇 |
2004年 | 999篇 |
2003年 | 940篇 |
2002年 | 974篇 |
2001年 | 1494篇 |
2000年 | 1424篇 |
1999年 | 1071篇 |
1998年 | 465篇 |
1997年 | 444篇 |
1996年 | 423篇 |
1995年 | 433篇 |
1992年 | 903篇 |
1991年 | 832篇 |
1990年 | 872篇 |
1989年 | 773篇 |
1988年 | 808篇 |
1987年 | 748篇 |
1986年 | 752篇 |
1985年 | 692篇 |
1984年 | 644篇 |
1983年 | 577篇 |
1982年 | 450篇 |
1979年 | 695篇 |
1978年 | 478篇 |
1977年 | 429篇 |
1975年 | 573篇 |
1974年 | 629篇 |
1973年 | 678篇 |
1972年 | 528篇 |
1971年 | 511篇 |
1970年 | 455篇 |
1969年 | 518篇 |
1968年 | 620篇 |
1967年 | 543篇 |
1966年 | 477篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
John W. Schuster David L. Gast Mark Wolery Sharon Guiltinan 《Journal of applied behavior analysis》1988,21(2):169-178
The effectiveness of a 5-s constant time-delay procedure to teach three chained food preparation behaviors to four moderately retarded adolescent students was evaluated within a multiple probe design across behaviors. Results indicate that the procedure was effective in teaching all four students to make a sandwich, boil a boil-in-bag item, and bake canned biscuits. The skills maintained with at least 85% accuracy over a 3-month period. Training generalized from the school to the home setting for the 2 subjects that completed generalization probe sessions. The percentage of errors across all skills and students was less than 9%. 相似文献
112.
Evidence increasingly links a high-fat, low-fiber diet to coronary heart disease and certain site cancers, indicating a need for large-scale dietary change. Studies showing the effectiveness of particular procedures in specific settings are important at this point. The present study, using an A-B-A-B design and sales data from computerized cash registers, replicated and extended previous work by showing that inexpensive prompts (i.e., signs and fliers) in a national fast-food restaurant could increase the sales of salads, a low-fat, high-fiber menu selection. Suggestions also are made pertinent to more widespread use of the procedures. 相似文献
113.
Brenda L. Dawson D. Balfour Jeffrey James A. Walsh 《Journal of applied social psychology》1988,18(16):1353-1360
This study investigated the effect of television food commercials on children's self-control within a resistance to temptation paradigm. Commercial type, food stimulus type, and the child's sex provided the three independent variables in a 4 × 4 × 2 factorial design. Behavioral and self-report indices of temptation and control were measured. Children were significantly more tempted to transgress for the low-nutrition food, regardless of the commercial shown. Sex differences in reported degree of temptation were found. However, the television commercials did not affect the children's latency to transgress. 相似文献
114.
Jack L. Powell 《Journal of applied social psychology》1988,18(9):760-773
The knew-it-all-along effect is investigated by comparing pre- and post-election predictions of subjects concerning three electoral races in the November 1984 elections. The results revealed that when the outcomes of the predictions are known, subjects recall having assigned higher probabilities and percentages to the actual winners of each election, remember having more confidence in the accuracy of these percentages, and claim to have had more knowledge of the candidates than they had before the election. The results were consistent across all three elections and in both repeated-measures and between-pups designs, suggesting that the knew-it-all-along effect is a very robust one. Two underlying processes are hypothesized to account for these results: the availability heuristic and an increase in confidence explanation. 相似文献
115.
Inexperienced beer-drinkers who could not pass a beer-flavor discrimination test were divided into a taste group, which received additional perceptual experience with beer flavors; a verbal group, which received instruction in beer flavor terminology; a taste/verbal group, which received both additional experience and instruction; and a control group. Before and after training, all subjects participated in a similarity rating task involving beer flavors and flavor-related adjectives. Additional taste experience--but not increased experience with beer-flavor terminology--improved novices' ability to detect identical beer flavors. Results are discussed in terms of the trainability of flavor discrimination and the role of cognitive factors (both flavor-related and flavor-independent) in marketing beverages. 相似文献
116.
Although peers' and teachers' evaluations of children's prosocial behavior and peers' sociometric ratings frequently have been used in studies of social development, the validity of young children's ratings of others has been questioned, as has that for teachers' ratings of prosocial behavior. In this study, preschoolers' ratings of peers' sociometric status and prosocial behavior, as well as teachers' ratings of children's prosocial dispositions, were obtained. These were correlated with children's naturally occurring prosocial or social behavior; ratings of prosocial behavior also were correlated with children's prosocial moral reasoning and prosocial self-attributions. Peers' sociometric ratings were positively related to children's sociability whereas prosocial ratings were related to helping (but not sharing) behavior. Teachers' ratings of prosocial behavior were not related to frequency of prosocial behaviors, but were positively related to developmentally mature moral judgments and self-reported motives. 相似文献
117.
In this study the authors compared women's and men's reactions to various professional travel situations. A multivariate analysis of covariance was used to determine the effects of sex, professional role, and years traveling on the perceptions of these travel situations. 相似文献
118.
The present study demonstrates the safety and effectiveness of an outpatient program designed to respond to adolescent-precipitated crises by mobilizing and restructuring the family's kinship system. Families of 75 adolescents at risk for hospitalization were followed up to 24 months after treatment with Systemic Crisis Intervention. Measures of offspring and family functioning, suicidal behavior, institutional use, and treatment costs are presented. Results clearly demonstrate the safety, effectiveness, and economic viability of Systemic Crisis Intervention. 相似文献
119.
120.
This binational study explored the need importance patterns and involvement in work and family contexts. Results reveal that in the work context, growth needs are most important, followed by affiliative and subsistence needs. In the family context, affiliative needs are most important, followed by subsistence and growth needs. Involvement in work and family contexts was found to be influenced by the need satisfaction potential of the respective contexts. This explained the nature of relationship between work and family involvement. The cross-national generalizability and usefulness of a motivational model for research on involvement in multilife-spheres are discussed. 相似文献