全文获取类型
收费全文 | 24248篇 |
免费 | 1041篇 |
国内免费 | 20篇 |
专业分类
25309篇 |
出版年
2020年 | 303篇 |
2019年 | 329篇 |
2018年 | 482篇 |
2017年 | 496篇 |
2016年 | 523篇 |
2015年 | 394篇 |
2014年 | 420篇 |
2013年 | 2062篇 |
2012年 | 820篇 |
2011年 | 903篇 |
2010年 | 544篇 |
2009年 | 557篇 |
2008年 | 738篇 |
2007年 | 751篇 |
2006年 | 663篇 |
2005年 | 585篇 |
2004年 | 572篇 |
2003年 | 600篇 |
2002年 | 572篇 |
2001年 | 806篇 |
2000年 | 804篇 |
1999年 | 588篇 |
1998年 | 277篇 |
1997年 | 283篇 |
1996年 | 246篇 |
1995年 | 248篇 |
1993年 | 248篇 |
1992年 | 457篇 |
1991年 | 409篇 |
1990年 | 421篇 |
1989年 | 407篇 |
1988年 | 398篇 |
1987年 | 382篇 |
1986年 | 389篇 |
1985年 | 385篇 |
1984年 | 346篇 |
1983年 | 317篇 |
1982年 | 227篇 |
1981年 | 226篇 |
1979年 | 296篇 |
1978年 | 275篇 |
1977年 | 233篇 |
1976年 | 239篇 |
1975年 | 274篇 |
1974年 | 328篇 |
1973年 | 284篇 |
1972年 | 256篇 |
1971年 | 212篇 |
1969年 | 227篇 |
1968年 | 242篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
221.
Hypnotic hallucination alters evoked potentials 总被引:2,自引:0,他引:2
222.
223.
224.
To compare the relative effectiveness of three compliance techniques during a museum fund-raising drive, 89 individuals were asked to contribute $1 to the museum after having been exposed to an initial request according to one of the following conditions: (1) in the foot-in-thedoor condition, individuals were first asked to sign a petition in support of the museum; (2) in the door-in-the-face condition, they were initially asked for a $5 contribution; (3) in the. low-ball condition, they were asked to contribute 75 cents and then to increase this amount by 25 cents in order to support the children's program: and (4) in the control condition, subjects simply received the target request for $1. The groups differed significantly in terms of the number of individuals who donated, and in the amount of their contributions. The low-ball condition was generally the most effective, especially with respect to the amount of money contributed. This was followed in turn by the door-in-the-face and control conditions, with the foot-in-the-door condition the least effective in virtually every comparison. These findings are discussed in terms of their implications for the experimental analysis of compliance, as well as the development of more effective fund-raising programs. 相似文献
225.
Louis D. Burgio Terry J. Page Richard M. Capriotti 《Journal of applied behavior analysis》1985,18(1):45-59
We evaluated methods for comparing the effects of dextroamphetamine (Dexedrine), thioridazine (Mellaril), and contingency management in the control of severe behavior problems. A reversal design was used in which medications were systematically titrated and assessed in unstructured as well as structured settings with three clients. Subsequently, behavioral procedures including timeout, differential reinforcement of other behavior, and visual screening, were used in a multiple-baseline design across settings. The assessment and design methods were useful in comparing the interventions. Dextroamphetamine decreased inappropriate behaviors and improved academic behaviors in one client, but no reliable effects were observed in the other two clients. Thioridazine was variable across clients, settings, behaviors, and dosages. Contingency management produced consistent decreases in inappropriate behaviors and small improvements in academic performance. 相似文献
226.
M G Clarkson R K Clifton B A Morrongiello 《Journal of experimental child psychology》1985,39(1):20-36
Two experiments assessed the importance of sound duration for eliciting head orientation responses from newborn infants. In Experiment 1, thirty infants turned with equal frequency toward 20-s continuous rattle sounds and 20-s trains of rattle segments. The duration of the rattle segments--14 and 100 ms (2/s), or 500 ms (1/s)--did not influence the likelihood of turning. Response latencies and durations proved quite similar for all stimuli. In Experiment 2, twenty-four infants heard continuous rattle sounds of four different durations: 1, 5, 10, and 20 s. They turned reliably to all stimulus durations; furthermore, the magnitude and temporal characteristics of head orientation responses did not differ for the four stimulus durations. These results suggest that the newborn's head orientation response may reflect a motor program that is initiated by auditory input and then executed in a similar fashion regardless of further stimulation. 相似文献
227.
Sex roles, gender, and fear 总被引:1,自引:0,他引:1
Male and female college students classified as masculine, feminine, androgynous, or undifferentiated on the Bem (1974) Sex Role Inventory (N = 199) were given the Wolpe (1969) Fear Inventory. Significant differences in average fear scores were seen between men and women and between the four sex-role categories, with sex role and gender contributing equally to the variability. The argument is raised here that excessive fearfulness or fearlessness might be as much a product of sex-role conditioning as a product of gender. 相似文献
228.
Richard R. Valencia 《Journal of School Psychology》1985,23(2):189-193
Test-retest stability of the Kaufman Assessment Battery for Children (K-ABC) was investigated over a 5-month interval for 42 Mexican-American preschool/kindergarten children. The results indicated that the stability coefficients for K-ABC Global scales and subtests were generally of adequate magnitudes (e.g., .70s and .80s), providing some evidence that the K-ABC is a relatively stable instrument for the sample. The results are discussed in the context of a test-retest study reported in the K-ABC Manual. Global scale stability coefficients were found to range from .76 to .90, and for the subtests the coefficients ranged from .26 to .89. The patterns of gain scores were very similar to the patterns reported in the stability investigation in the K-ABC Manual. 相似文献
229.
230.
M K Johnson J K Kim G Risse 《Journal of experimental psychology. Learning, memory, and cognition》1985,11(1):22-36
In this study we report two experiments that investigate the acquisition of affective reactions. In Experiment 1, unfamiliar melodies were played to Korsakoff's syndrome patients and alcoholic and nonalcoholic control subjects who were matched with them according to age and education. Following a retention interval of 5 min, subjects received a preference test on old and new melodies. Korsakoff's syndrome patients showed the same increase in preference for old melodies as a consequence of prior exposures as control subjects did, but their recognition of melodies was significantly impaired in comparison with controls. In Experiment 2, the same subjects saw photographs of two men. Fictional biographical information depicted one as a "good guy" and the other as a "bad guy." After a retention interval of approximately 20 days, Korsakoffs recalled virtually none of the biographical information; however, 78% preferred the good guy, and impression ratings were less favorable for the bad guy. Korsakoff patients developed preferences and impressions even though they did not have voluntary access to the information on which the preferences were based. However, their impression ratings were less extreme than those of controls. The pattern of results of the two studies is discussed in terms of Johnson's (1983) MEM model of memory. 相似文献