全文获取类型
收费全文 | 46775篇 |
免费 | 1848篇 |
国内免费 | 23篇 |
出版年
2020年 | 502篇 |
2019年 | 496篇 |
2018年 | 818篇 |
2017年 | 791篇 |
2016年 | 828篇 |
2015年 | 569篇 |
2014年 | 751篇 |
2013年 | 3465篇 |
2012年 | 1328篇 |
2011年 | 1362篇 |
2010年 | 835篇 |
2009年 | 879篇 |
2008年 | 1256篇 |
2007年 | 1215篇 |
2006年 | 1105篇 |
2005年 | 970篇 |
2004年 | 943篇 |
2003年 | 929篇 |
2002年 | 894篇 |
2001年 | 1400篇 |
2000年 | 1400篇 |
1999年 | 1073篇 |
1998年 | 483篇 |
1997年 | 485篇 |
1996年 | 455篇 |
1992年 | 935篇 |
1991年 | 841篇 |
1990年 | 893篇 |
1989年 | 798篇 |
1988年 | 777篇 |
1987年 | 756篇 |
1986年 | 816篇 |
1985年 | 845篇 |
1984年 | 688篇 |
1983年 | 605篇 |
1982年 | 450篇 |
1979年 | 711篇 |
1978年 | 563篇 |
1977年 | 471篇 |
1976年 | 480篇 |
1975年 | 610篇 |
1974年 | 766篇 |
1973年 | 780篇 |
1972年 | 604篇 |
1971年 | 599篇 |
1970年 | 532篇 |
1969年 | 574篇 |
1968年 | 717篇 |
1967年 | 632篇 |
1966年 | 663篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
951.
Several inherent limitations to secondary school sex education program evaluations are: limited generalizability, lack of longitudinal research, and no clear consensus of program outcomes. With a Bureau of Health Education, Center for Disease Control study as the criterion for program outcomes, a study was undertaken to examine the immediate and long-term impact of sex education upon program participants. Two of the 20 schools in the CDC study identified as having exemplary sex education programs provided access to their students and alumni. Inventories which measured perceived achievement of 33 sex education outcomes were piloted for reliability and validity. Each inventory examined participant changes in knowledge, understanding of self, values, interaction skills, self-esteem, and fear of sex-related activities. Students were surveyed in school; alumni were surveyed through the mail. Response rates ranged from 30 to 100 percent for students and alumni at both schools. Overall there was no statistically significant difference between the perceptions of students and alumni as to achievement of investigated outcomes. Alumni responses at one school did, however, indicate some potentially weak areas of their school's program with respect to values and interaction skills outcomes. It appears that program impact may decrease with time. Thus, isolating and addressing the factors involved may be necessary. This would assist program planners and instructors to strengthen curricula and program activities in order to enhance the overall impact of sex education. The present study supports the notion that positive gains are achieved as a result of each school's sex education program, and these gains remained over time. 相似文献
952.
W S Poland 《Journal of the American Psychoanalytic Association》1984,32(2):283-299
It is by the application of the principle of neutrality, born of his respect for the essential otherness of the patient, that the analyst focuses the dyadic analytic work in the service of the patient's growing self-analytic capacity. Thus, the general principle of neutrality is distinguished from the technical tactic of abstinence, the latter being a specific function utilized to facilitate and foster analytic regression. Neutrality can be defined as it applies to the major subfunctions of the analyst's work ego. Perception of the patient's intrapsychic processes (both empathically and cognitively) requires a neutrality of appearance on the analyst's part in order to minimize the distortion of the unfolding transference neurosis. Integration and understanding of the patient's communications require mastery and neutralization of the analyst's own internal processes in order to minimize countertransferential distortions. Appropriate interpretive intervention requires neutrality of action, i.e., mastery of impulses related to power, neutralizing them into the service of the analytic work; tact is defined as a specific psychoanalytic function in this regard. Collaborative ignorance is examined as a specific instance of false neutrality. In this an analytic guise serves to mask a countertransferential conflict. Neutrality serves as an overriding technical principle, not an imperative for perfectionism . Factors intrinsic to the analytic process also influence the application of this principle. 相似文献
953.
954.
W. M. O'neil 《Australian journal of psychology》1984,36(2):285-289
Three myths about Wundt have been perpetuated in English language accounts of his work. First, he is said to have founded a Psychologisches Institut (a formally recognized psychological research laboratory) in 1879. Second, he is said to be the first psychologist, as distinct from the first contributor to psychology. Third, he is said to have formulated an elementarist psychology of mental content or experience. The first and second are trivial myths which in isolation would be scarcely worth a comment. The third is a gross misrepresentation which ignores the purposivist-voluntarist underlay of his experimental cognitive psychology and the humanistic, cultural concern of his Völkerpsychofogie. 相似文献
955.
956.
Frances W. Beck 《Journal of School Psychology》1984,22(4):347-352
The purpose of this study was (a) to determine if a declassification occurs when estimated learning potential (ELP) is used in reevaluation of special education students and (b) to assess the effects of the use of ELP by multidisciplinary teams. Subjects included 107 black and 13 white students (83 males and 37 females) referred for reevaluation from classes for the mentally retarded. Data analysis consisted of determining the percentage of students who would be classified as mentally retarded according to the main criterion of (a) Wechsler Intelligence Scale for Children-Revised (WISC-R) scores, or (b) ELP scores, or (c) multidisciplinary teams' placement. A chi-square test of independence indicated a significant difference between WISC-R and ELP scores; and between multidisciplinary teams' placement and ELP scores (p<.05). Students already in special education classes for the mentally retarded were not determined to be ineligible for services by multidisciplinary teams, even though 15% of the students would be ineligible for services according to ELP scores. 相似文献
957.
A comparison of the WISC-R and the Woodcock-Johnson Psycho-Educational Educational Battery (W-J) was made for children with regular and learning-disabled (LD) class placement. The W-J and Wechsler Intelligence Scale for Children-Revised (WISC-R) evidence low to moderate correlations and significant mean differences, indicating that the two tests are measuring somewhat different abilities to somewhat differing degrees. W-J—WISC-R correlations for the regular students exceed those of the LD students in the greater majority of the cases. Rank ordering of the WISC-R subtests and the W-J clusters indicate, as might be expected, that the LD students fare the worst in the WISC-R academic subtests (Arithmetic, Information and Vocabulary) and in the W-J academic clusters. More research needs to be conducted with the W-J before it should be adopted for use in the placement of exceptional children. 相似文献
958.
David P. Lindeman Henry A. Goodstein Arlene Sachs Clifford C. Young 《Journal of School Psychology》1984,22(1):111-117
The purpose of the present study was to evaluate the predictive validity of the Yellow Brick Road Test (YBRT) relative to performance in reading as measured by the Metropolitan Achievement Test (MAT). A full prediction-performance comparison matrix was employed to compare three different cutoff scores for the YBRT for the identification of “at-risk” children. Four hundred and fourteen kindergarten-aged children were administered the YBRT, 214 of whom were followed to the end of second grade. It was concluded that the YBRT is a moderately valid instrument for predicting the level of reading achievement in a population with a different average performance level from the normative sample. However, the results of this study failed to support the utility of the test author's suggested use of a score of 120 as the cutoff score. Finally, it is recommended that a prediction-performance comparison study be considered standard methodology for the evaluation of the validity and efficiency of screening instruments. 相似文献
959.
960.
A temporal limit on the effect of future food on current performance in an analogue of foraging and welfare 总被引:6,自引:5,他引:1
下载免费PDF全文
![点击此处可从《Journal of the experimental analysis of behavior》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Timberlake W 《Journal of the experimental analysis of behavior》1984,41(2):117-124
Rats obtained access to food twice each 24-hour period. The first session was a work session in which food was available on a progressive-ratio schedule. During the second session, which occurred between 1 and 23 hours after the work session, food was freely available up to a fixed total intake each 24 hours. The situation resembled elements of several real world circumstances, including the choice between continuing to forage in a rapidly depleting patch and waiting for a better patch, and between working now and receiving a guaranteed income later. The purpose of the experiment was to explore the time period over which future access to reward could affect current responding. Contrary to what might be expected from recent theorizing, anticipation of future food delayed by an hour or more after the start of the work session had no effect on current performance. Food intake was high and constant during work sessions except for a prefeeding effect that occurred when the free session closely preceded the next day's work session. Also, an increase in the difficulty of the work schedule increased the amount of work and the maximum price paid for food as if the work session were the only time food was available. The results indicate the importance of considering temporal limits in theories that require animals to integrate input over time to determine the allocation of resources among alternatives. 相似文献