全文获取类型
收费全文 | 1621篇 |
免费 | 99篇 |
出版年
2023年 | 17篇 |
2022年 | 19篇 |
2021年 | 23篇 |
2020年 | 40篇 |
2019年 | 42篇 |
2018年 | 54篇 |
2017年 | 75篇 |
2016年 | 66篇 |
2015年 | 40篇 |
2014年 | 51篇 |
2013年 | 167篇 |
2012年 | 97篇 |
2011年 | 70篇 |
2010年 | 49篇 |
2009年 | 55篇 |
2008年 | 60篇 |
2007年 | 73篇 |
2006年 | 46篇 |
2005年 | 41篇 |
2004年 | 49篇 |
2003年 | 51篇 |
2002年 | 53篇 |
2001年 | 43篇 |
2000年 | 29篇 |
1999年 | 34篇 |
1998年 | 27篇 |
1997年 | 11篇 |
1996年 | 13篇 |
1995年 | 18篇 |
1994年 | 21篇 |
1993年 | 12篇 |
1992年 | 14篇 |
1991年 | 14篇 |
1990年 | 12篇 |
1989年 | 11篇 |
1988年 | 10篇 |
1987年 | 13篇 |
1986年 | 15篇 |
1985年 | 14篇 |
1984年 | 14篇 |
1983年 | 10篇 |
1982年 | 11篇 |
1980年 | 9篇 |
1978年 | 9篇 |
1977年 | 8篇 |
1974年 | 9篇 |
1972年 | 8篇 |
1971年 | 9篇 |
1968年 | 11篇 |
1966年 | 13篇 |
排序方式: 共有1720条查询结果,搜索用时 15 毫秒
21.
Matthew G. Hile Donna M. Campbell Bagher B. Ghobary Marcie N. Desrochers 《Behavior research methods》1993,25(2):195-198
The development of expert and decision support systems requires the collection, organization, codification, and storage of a body of specialized knowledge. The development, using reconstructive methods, of two such knowledge bases, the first containing the current scientific literature and the second containing an expert’s knowledge, is described for an automated decision support system, the Mental Retardation-Expert. This system provides practitioners with assistance in the treatment of aggressive, self-injurious, and destructive behaviors displayed by individuals with mental retardation or developmental disabilities. The average interobserver reliability of the expert knowledge base ranged from 92.5% to 95.0% when calculated across four clinicians’ assessments of 31 abstracted cases. 相似文献
22.
Procurement of organs from non-heart-beating cadaver donors raises concerns. Standards for optimal patient care during withdrawal of life-sustaining therapy are evolving and continue to be debated and studied. Consensus on specific procedures and methods has not been attained, however, and protocols for the procurement of organs from patients following the withdrawal of life-sustaining therapies may compromise the evolving standards and harm the patient and the attendant family. In addition, there is little evidence to suggest that such protocols will significantly increase the number of organs procured. "Non-heart-beating cadaver" protocols that do not give comprehensive attention to optimal patient/family care at the time of withdrawal of life-sustaining therapy ought not to be endorsed. 相似文献
23.
Cris M. Sullivan Rebecca Campbell Holly Angelique Kimberly K. Eby William S. Davidson II 《American journal of community psychology》1994,22(1):101-122
Presented the 6-month follow-up findings of an experimental intervention designed to provide postshelter advocacy services
to women with abusive partners. The intervention involved randomly assigning half the research participants to receive the
free services of an advocate, 4 to 6 hours per week, for the first 10 weeks postshelter. One hundred forty-one battered women
were interviewed about their experiences immediately upon their exit from a domestic violence shelter: 95% of the sample were
interviewed 10 weeks thereafter (postintervention), and 93% were successfully tracked and interviewed 6 months later. At the
6-month follow-up, participants in both groups reported increased social support, increased quality of life, less depression,
less emotional attachment to their assailants, and an increased sense of personal power. Although women in both groups reported
some decrease in physical abuse over time, there were no statistically significant differences between those with and those
without advocates, and abuse continued to be a problem for many women. Those who were still involved with their assailants
continued to experience higher levels of abuse and had been more economically dependent upon the men prior to entering the
shelter. Women who had worked with advocates continued to report being more satisfied with their overall quality of life than
did the women in the control group.
The authors thank the Editor and anonymous reviewers for their helpful comments. Thanks also to all present and past staff
of the Community Advocacy Project, who helped in data collection and analyses. This work was supported by National Institute
of Mental Health Grant 1R01 MH 44849. 相似文献
24.
We report on an observational study on sex differences in serious and playful aggression in early childhood. The sample included 14 girls and 14 boys, aged 2 to 4. The study was carried out in Porto Alegre, Brazil. Half of the subjects attended a nursery school for children from a favela (slum district); the others attended a nursery school that was run by a local university and represented the life conditions of the middle class of the Brazilian society. Each of the children was observed at school for 3 hours (divided into 12–15 minutes episodes) through a focal sampling technique. Significant sex differences are found for the frequency of playful aggression for both the actor's and the victim's part of the aggressive act, but for the actor's role the effect holds only for the middle class setting. There are also tremendous differences between the frequencies of serious aggression in girls and some of the boys, although the effect is not statistically significant. When several types of aggression are compared, it becomes evident that sex differences are restricted to bullying (dominant aggression). The rates of instrumental and reactive aggression are similar in both sexes. Girls and boys from the favela setting do not differ in the relative importance of the different types of serious aggression, but in middle class children the proportion of acts of bullying is much higher in boys than in girls.Revised and elaborated version of the contribution to the Paper Session onFemale Aggression at the90th Annual Meeting of the American Anthropological Association in Chicago, 1991. We thank Claúdio Simon Hutz and Tânia Sperb who helped us to carry out the observations and Simone Schenk and Iris Seltenreich for help in data analysis. We are also grateful to the children and the staff of two nursery schools in Porto Alegre, Brazil, who participated in the study. 相似文献
25.
Claudia J. Haferkamp 《Current Psychology》1994,13(3):248-262
Relationships among relationship beliefs, self-monitoring and conflict behavior were examined in 74 married couples. It was
predicted that dysfunctional relationship beliefs would be negatively correlated with marital satisfaction and that high self-monitoring
spouses would endorse more dysfunctional relationship beliefs and display more disagreeing and leadership conflict behavior.
Dysfunctional beliefs were negatively correlated with satisfaction but low and high self-monitors did not differ in their
conflict behavior. Discriminant analyses indicated that marital distress was a function of endorsement of dysfunctional relationship
beliefs; decreased satisfaction with decisions; increased conflict relevance; and increased impression management reflected
in high self-monitoring orientations among husbands and wives’ beliefs that their husbands were not behaving “normally.” The
contribution of gender and impression management to marital distress is discussed.
This study was funded by a University of Wisconsin-Madison faculty research grant awarded to the author. 相似文献
26.
27.
Eight cats with lesions in the posterior temporal (PT) cortex, seven cats with lesions in the basolateral amygdala (BLA), and eight intact controls were observed on eight tests of visual discrimination learning and of spontaneous responses to salient visual stimuli. The effects of the two lesions were somewhat dissociable. The PT lesions were accompanied by a severe deficit in pattern discrimination learning but no loss in visual tracking or orientation to the silhouette of a threatening cat. The BLA lesions produced a milder and less consistent loss in pattern discrimination but serious defects in tracking and reponse to the cat silhouette. Both operated groups performed well on the visual cliff. The deficit from PT lesions appeared independent of damage to the geniculocortical system. The parallel of symptoms from PT lesions in cats and inferotemporal lesions in monkeys is discussed. 相似文献
28.
Dr. Campbell B. Read 《Psychometrika》1978,43(3):409-420
Three-dimensional contingency tables are analyzed, with one variable (e.g., sex) as a factor, and with a natural relation between the other variables (e.g. left and right eye vision). Models of special interest, like symmetry and proportional symmetry between the related variables, and homogeneity across the factor levels, are investigated. Maximum likelihood estimators of parameters and partitions of chi-square goodness-of-fit statistics are explicitly presented; the independence of certain models is noted, and an example is discussed. 相似文献
29.
A single lever, discrete-trials observing procedure was used with stumptailed monkeys (Macaca arctoides). Lever-presses during a trial produced colored key lights (IS+ and IS?) which signaled whether the trial would end with response-independent food or without food. During the baseline period, both IS+ and IS? were produced on a variable-interval (VI) 15-sec schedule which began operating at the onset of the trial. The two experimental conditions involved a combination of this VI schedule and a DRL schedule. In one of these conditions, only a response that both met the VI requirement and was preceded by at least 6 sec of nonresponding could produce IS? on nonfood trials, while the schedule for IS+ on food trials remained VI 15 sec. In the other experimental condition, the schedules for producing the two stimuli were the reverse. All subjects eventually learned to produce either IS+ or IS? on the combined VI-DRL schedule. These data support an information hypothesis of observing in monkeys and contrast with data from pigeons which support a conditioned reinforcement hypothesis. 相似文献
30.
Maximizing the potential of worksites for smoking intervention remains elusive. We hypothesized that long-term effectiveness of group intervention would be enhanced when offered within an "enriched milieu" (full program) compared with relative isolation (group only). The data failed to support the hypothesis. Although sustained abstinence rates were higher at full-program sites (50%) than at group-only sites (44%), the difference did not achieve statistical significance. Initial (35% vs. 47%) and 12-month (18% vs. 22%) quit rates at full-program and group-only sites also failed to demonstrate the "benefit" of the "enriched milieu." 相似文献