全文获取类型
收费全文 | 84688篇 |
免费 | 3353篇 |
国内免费 | 35篇 |
专业分类
88076篇 |
出版年
2020年 | 806篇 |
2019年 | 1075篇 |
2018年 | 1476篇 |
2017年 | 1544篇 |
2016年 | 1595篇 |
2015年 | 1151篇 |
2014年 | 1332篇 |
2013年 | 6420篇 |
2012年 | 2453篇 |
2011年 | 2713篇 |
2010年 | 1727篇 |
2009年 | 1690篇 |
2008年 | 2423篇 |
2007年 | 2389篇 |
2006年 | 2201篇 |
2005年 | 1908篇 |
2004年 | 1775篇 |
2003年 | 1737篇 |
2002年 | 1791篇 |
2001年 | 2779篇 |
2000年 | 2732篇 |
1999年 | 2048篇 |
1998年 | 1003篇 |
1997年 | 866篇 |
1996年 | 852篇 |
1992年 | 1749篇 |
1991年 | 1627篇 |
1990年 | 1603篇 |
1989年 | 1452篇 |
1988年 | 1416篇 |
1987年 | 1401篇 |
1986年 | 1435篇 |
1985年 | 1504篇 |
1984年 | 1251篇 |
1983年 | 1086篇 |
1982年 | 818篇 |
1981年 | 800篇 |
1979年 | 1304篇 |
1978年 | 939篇 |
1977年 | 799篇 |
1975年 | 1081篇 |
1974年 | 1174篇 |
1973年 | 1288篇 |
1972年 | 1058篇 |
1971年 | 970篇 |
1970年 | 864篇 |
1969年 | 935篇 |
1968年 | 1146篇 |
1967年 | 1024篇 |
1966年 | 955篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
951.
952.
953.
Fear of death and the concept of extended self 总被引:1,自引:0,他引:1
954.
Flicker fusion frequencies of 48 healthy controls and of 35 alcoholics were measured to detect possible associations between flicker fusion and signs of nonspecific brain damage, the aim of the study. FFF was statistically significantly lower in patients addicted to alcohol than in healthy subjects. Lower flicker fusion frequencies were associated with the severeness of organic psychosis as rated psychopathologically. The hypothesis that addiction to alcohol is a sign of diffuse, nonspecific, organic brain damage was discussed. 相似文献
955.
On the basis of surveys completed by 105 male participants in a popular marathon, a multiple regression analysis was conducted to identify the variables contributing significantly to the prediction of final time. Overall prediction was successful, with R = .896, and training pace was the most important factor in the equation, speedier workouts being associated with faster marathon times. Final time was also related positively to best 10-km race time in the previous 12 mo. and repression-sensitization (faster runners being more sensitized), and negatively to maximum number of training miles in a single week, number of previous marathons completed, and number of days of training lost through illness or injury. Contrary to expectations, locus of control was not related to final time. Only 27% of the runners had lost training time through injury, but a discriminant analysis showed that, compared to those who had avoided this problem, the injured were younger, rested less, ran less in the week prior to the marathon, ran a slightly longer long run but ran it earlier before the race, and ran fewer runs of 20 miles or more. It is suggested that researchers should study the repression-sensitization variable and investigate injury in runners preparing for a marathon. 相似文献
956.
The Safety Locus of Control Scale was designed to predict employees' accidents and injuries. Internal scorers think they should assume personal responsibility for their safety, and they believe they can take preventive steps to avoid accidents. External scorers assume little personal responsibility for prevention of accidents. Instead, they place more blame on factors outside their control, such as luck or chance. This study showed that the safety scale was effective in differentiating between groups with varying accident histories, which supports the criterion-related validity of the scale. 相似文献
957.
R M Olig R D Staton W W Beatty H Wilson R I Biberdorf S G Hoag R A Brumback 《Perceptual and motor skills》1985,60(3):879-889
Plasma concentrations of imipramine and amitriptyline and their desmethylated metabolites were measured in 20 children being treated for major depressive illness 2 wk. and 5 to 10 wk. after achieving drug dosages of 2.25 mg/kg body weight. At 2 wk. all children had exhibited clinical improvement, but by 10 wk. 4 of the 10 children treated with imipramine and 5 of the 10 children treated with amitriptyline had experienced clinical relapse of depressive symptoms. Tricyclic antidepressant plasma concentrations and ratios were comparable in the subgroups of children who maintained their clinical improvement and those who relapsed. There was no evidence of a systematic decline in plasma tricyclic antidepressant concentrations in those children who relapsed. 相似文献
958.
Subjects in a prior study of complex learning often experienced difficulty in mastering the task because of an apparent reluctance to release one perceptual field and reconstrue the task on a higher cognitive level. It was hypothesized that were this the correct explanation, the faster learners would be more field independent on a measure of field dependence, since independence has been defined in terms of ease in releasing one's attention from the immediate perceptual field. This hypothesis was tested with 22 undergraduate subjects for whom Group Embedded Figures Test scores were correlated with the number of trials to completion on the complex learning task. A moderate but significant correlation supported the hypothesis. 相似文献
959.
The association of left lateral eye-movement with emotionality or arousal of affect and of right lateral eye-movement with cognitive/interpretive operations and functions was investigated. Participants were junior and senior students enrolled in an undergraduate course in developmental psychology. There were 37 women and 13 men, ranging from 19 to 45 yr. of age. Using videotaped lateral eye-movements of 50 participants' responses to 15 visually presented stimuli (precategorized as neutral, emotional, or intellectual), content and statistical analyses supported the association between left lateral eye-movement and emotional arousal and between right lateral eye-movement and cognitive functions. Precategorized visual stimuli included items such as a ball (neutral), gun (emotional), and calculator (intellectual). The findings are congruent with existing lateral eye-movement literature and also are additive by using visual stimuli that do not require the explicit response or implicit processing of verbal questioning. 相似文献
960.
28 older women participating in an exercise program were compared to 30 older women not participating in an exercise program on two behavioral measures. There were no significant main effects for participation-nonparticipation in an exercise program. Significant main effects were found, however, for each of three social variables. 相似文献