全文获取类型
收费全文 | 39073篇 |
免费 | 1469篇 |
国内免费 | 13篇 |
出版年
2019年 | 417篇 |
2018年 | 569篇 |
2017年 | 548篇 |
2016年 | 593篇 |
2015年 | 413篇 |
2014年 | 573篇 |
2013年 | 2919篇 |
2012年 | 978篇 |
2011年 | 1075篇 |
2010年 | 695篇 |
2009年 | 682篇 |
2008年 | 995篇 |
2007年 | 959篇 |
2006年 | 919篇 |
2005年 | 771篇 |
2004年 | 800篇 |
2003年 | 767篇 |
2002年 | 774篇 |
2001年 | 1029篇 |
2000年 | 1106篇 |
1999年 | 807篇 |
1998年 | 442篇 |
1997年 | 419篇 |
1996年 | 424篇 |
1995年 | 407篇 |
1992年 | 736篇 |
1991年 | 693篇 |
1990年 | 706篇 |
1989年 | 659篇 |
1988年 | 666篇 |
1987年 | 610篇 |
1986年 | 666篇 |
1985年 | 651篇 |
1984年 | 553篇 |
1983年 | 522篇 |
1981年 | 404篇 |
1979年 | 625篇 |
1978年 | 512篇 |
1977年 | 416篇 |
1976年 | 428篇 |
1975年 | 532篇 |
1974年 | 636篇 |
1973年 | 689篇 |
1972年 | 539篇 |
1971年 | 550篇 |
1970年 | 475篇 |
1969年 | 533篇 |
1968年 | 648篇 |
1967年 | 601篇 |
1966年 | 591篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
The effect of a fading procedure upon the acquisition of control by an overshadowed auditory feature
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)
Pigeons' key-pecking responses were reinforced in the presence of a compound stimulus that consisted of an auditory feature (a tone) and a visual feature (a light) and non-reinforced in the presence of a compound stimulus that was either a noise and a dark key, or noise and a light. In the condition where reinforcement trials differed from non-reinforcement trials on the basis of both auditory and visual features, the tone exerted very little control over responding on test. In the condition where reinforcement differed from non-reinforcement trials solely on the basis of the auditory features, an abrupt and a gradual introduction of the visual feature of the negative stimulus, a light, were compared for their effect upon control in the compounds. The tone acquired strong control in both cases. Evidence indicated that the tone had acquired control in the gradual condition without the occurrence of responses to the negative stimulus. An incidental finding was that when the negative stimulus consisted of a noise and a light, which was introduced abruptly, responding over the light dimension with tone, on test, was peaked at a point other than that light value used as positive and negative during training. 相似文献
912.
A free-operant avoidance schedule was used to establish and maintain foot-treadle responding by two Homing, one White King, and two Carneaux pigeons. In the absence of responding, the interval between shocks equaled 10 sec. Each time a treadle response occurred the shock was postponed for 32 sec. Pigeons appear to learn the treadle response more quickly and use it to avoid shock more successfully than do rats bar pressing on similar schedules. The treadle response becomes highly stereotyped and interresponse time distributions obtained from terminal behavior appear very similar to data obtained from rats. It is concluded that the difficulty in training pigeons to avoid electric shock is not in establishing avoidance behavior but in attempting to evaluate such behavior with the key-peck response. 相似文献
913.
Rate-dependent effects of drugs: modification by discriminative stimuli of the effects of amobarbital on schedule-controlled behavior 总被引:1,自引:1,他引:0
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)
James W. McKearney 《Journal of the experimental analysis of behavior》1970,14(2):167-175
Food-deprived pigeons responded under a 10-min fixed-interval schedule of food presentation. During even-numbered minutes of the schedule, the discriminative stimuli were the same as those present when food was delivered. During odd-numbered minutes there was either a change in keylight color or a change in overhead illumination, either for the entire duration of the odd-numbered minutes, or for 3-sec after each response. Responding during even-numbered minutes showed the usual pattern of positive acceleration; responding during odd-numbered minutes was similarly graded, but rates were much lower. The response-rate-increasing effects of amobarbital were inversely related to control rates of responding for both even- and odd-numbered minutes. However, when the stimulus change during odd-numbered minutes was either keylight color or a change from a darkened to a brightly illuminated chamber, increases in responding were considerably less than predicted on the basis of the effects on responding during even-numbered minutes. When the stimulus change was from a darkened to a dimly illuminated chamber, control rates of responding changed little, but increases in responding during odd-numbered minutes after amobarbital were considerably greater, and of the approximate order expected on the basis of control rate. 相似文献
914.
915.
916.
917.
The impact of professional negotiations on the current educational scene is examined and related to clarification of the school counselor role. Role confusion continues in the school situation, and negotiations may well be the way to bring about a change in the status quo. Negotiations for counselors are explored from the standpoints of dimensions of negotiations, implementation of negotiations, and attitude of professional associations. Conclusions are that negotiations have significant implications for counselor role delineation. 相似文献
918.
R. W. FAUNCE 《Journal of counseling and development : JCD》1970,48(7):542-545
A work experience project for low income adults is described. “Counselors” in this project were found to have little experience; little training in interviewing, statistics, psychological analysis, or other guidance and counseling techniques; and inadequate supervision. Results on aptitude tests were reported on the average 26 days after test administration. Occupational information was sadly lacking. The question is raised: When is a counselor… ? 相似文献
919.
This study sought to assess students' reactions toward their vocational and educational counseling at a university counseling center. Students receiving educational-vocational counseling during the 1968-69 academic year served as subjects whose responses to a 29-item questionnaire were used to determine their reactions to counseling. The majority of clients who were counseled by advanced trainees or doctorate level staff viewed their counseling experience positively. A large percentage of the clients of beginning practicum students viewed their counseling negatively. The findings suggested weaknesses in vocational counseling facilities, in counselors' skills, and in training of beginning practicum students. Implications for change are suggested and the need for assessment in counseling agencies is emphasized. 相似文献
920.
Today's college students are finding an increasing need for legal information. At California State College, Los Angeles, a lawyer from the community was retained by the college counseling center to consult with students who had legal questions. During the academic year 1968-69, 302 students took advantage of this service. Although most of their questions dealt with selective service, other areas of concern included landlord-tenant matters, domestic relations, and criminal and civil law. Student reactions were sampled by means of a questionnaire. The general response was highly favorable, thus supporting the need for a legal counseling service on the college campus. 相似文献