全文获取类型
收费全文 | 7137篇 |
免费 | 397篇 |
国内免费 | 4篇 |
出版年
2023年 | 59篇 |
2022年 | 48篇 |
2021年 | 68篇 |
2020年 | 141篇 |
2019年 | 203篇 |
2018年 | 235篇 |
2017年 | 243篇 |
2016年 | 242篇 |
2015年 | 175篇 |
2014年 | 231篇 |
2013年 | 870篇 |
2012年 | 302篇 |
2011年 | 355篇 |
2010年 | 202篇 |
2009年 | 222篇 |
2008年 | 317篇 |
2007年 | 241篇 |
2006年 | 249篇 |
2005年 | 229篇 |
2004年 | 224篇 |
2003年 | 222篇 |
2002年 | 215篇 |
2001年 | 139篇 |
2000年 | 131篇 |
1999年 | 95篇 |
1998年 | 83篇 |
1997年 | 76篇 |
1996年 | 75篇 |
1995年 | 65篇 |
1994年 | 60篇 |
1993年 | 48篇 |
1992年 | 76篇 |
1991年 | 71篇 |
1990年 | 66篇 |
1989年 | 67篇 |
1988年 | 54篇 |
1987年 | 62篇 |
1986年 | 73篇 |
1985年 | 66篇 |
1984年 | 74篇 |
1983年 | 66篇 |
1982年 | 61篇 |
1981年 | 50篇 |
1980年 | 54篇 |
1979年 | 58篇 |
1978年 | 47篇 |
1977年 | 46篇 |
1976年 | 46篇 |
1974年 | 43篇 |
1967年 | 45篇 |
排序方式: 共有7538条查询结果,搜索用时 656 毫秒
971.
Homophobia: a tentative personality profile 总被引:1,自引:0,他引:1
K T Smith 《Psychological reports》1971,29(3):1091-1094
972.
Repetition effect and short-term memory 总被引:2,自引:0,他引:2
M C Smith 《Journal of experimental psychology. General》1968,77(3):435-439
973.
974.
In this paper we consider two problems concerning human psychophysical discriminability of variable interval nerve action potential patterns. The first question asks which of two possible alternatives-additional sample size or elongation of duration-is responsible for the improvement in performance as the number of pulses in a stimulus train increases. Our data strongly indicated that the answer to this question is increased sample size. The second question concerns what effect, if any, parallel rather than serial presentation of the two alternatives in a forced choice psychophysical test will have on the function relating interpulse interval and discriminability. The answer to this question appears to be that other than a slight elevation of the absolute levels no changes in the general form of the response is produced. 相似文献
975.
This study presents data on the luminance difference at which a hue difference is first perceived between two identical spectral lights. Thresholds were obtained for both luminance increments and decrements from a 2.00 log troland standard for wavelengths between 470 nm and 690 nm. A predicted luminance threshold for each wavelength was calculated based on wavelength discrimination data and the Purdy constant hue contours; i.e. that luminance at which the constant hue contour intersects the wavelength discrimination bound for a given wavelength. A generally good agreement was obtained between observed and predicted values. 相似文献
976.
977.
Andrew Livingston 《Integrative psychological & behavioral science》1974,9(3):160-168
Four female mongrel dogs were used. Three had both ureters transplanted to the surface of the abdomen and one had a unilateral nephrectomy on the left and the right ureter transplanted to the abdomen. In dogs with externalized ureters our results with dopamine show changes in cardiac rate and renal secretion. The method used was 1) injection of dopamine, 2) measurement of subsequent changes in renal secretions (unconditional reflex), 3) and heart rate (HR). After 40 daily injections im of 2.5 mg/kg in normal saline the possible production of a diuretic CR was tested by injecting normal saline im and a tone was used as a signal. The control for normal saline showed no change in HR nor any of the constituents measured. The dopamine injection resulted in an increase of epinephrine in the urine of 300–600 per cent for 45 minutes; of norepinephrine of 200–500 per cent for 45 minutes; of an increase of 50 per cent in urine volume for 45 or more minutes; of absolute Na secretion of 49 per cent, of K, 20 per cent; of creatinine, 39 per cent (average in 3 dogs for 45 minutes diuresis). When the conditional stimulus (normal saline and tone) was given after several months training with the conditional signal and the injection of dopamine, there was no significant CR change to the HR nor any of the above components of urine. The conclusion is that in spite of the great increase of urine volume and composition of above substances there was no significant increase to the signals for the im injection of dopamine,i.e., no conditioning to dopamine. 相似文献
978.
R. P. Mial P. C. Smith M. E. Doherty O. W. Smith 《Attention, perception & psychophysics》1974,16(1):1-3
Previous studies have demonstrated that a form’s identity affects the phenomenal hue of that form. This effect has been attributed to the operation of the “memory color” phenomenon. The present study was proposed to assess the effect of “memory” or characteristic color on form identification. Results indicate that memory color, rather than interacting with the object in such a manner as to aid identification, induces a bias toward identification of an object of the memory color. 相似文献
979.
980.