全文获取类型
收费全文 | 124540篇 |
免费 | 5019篇 |
国内免费 | 45篇 |
专业分类
129604篇 |
出版年
2020年 | 1317篇 |
2019年 | 1624篇 |
2018年 | 2251篇 |
2017年 | 2312篇 |
2016年 | 2446篇 |
2015年 | 1743篇 |
2014年 | 2091篇 |
2013年 | 10597篇 |
2012年 | 3858篇 |
2011年 | 4007篇 |
2010年 | 2500篇 |
2009年 | 2484篇 |
2008年 | 3556篇 |
2007年 | 3492篇 |
2006年 | 3210篇 |
2005年 | 2786篇 |
2004年 | 2698篇 |
2003年 | 2598篇 |
2002年 | 2611篇 |
2001年 | 3854篇 |
2000年 | 3682篇 |
1999年 | 2826篇 |
1998年 | 1412篇 |
1997年 | 1265篇 |
1996年 | 1375篇 |
1995年 | 1273篇 |
1994年 | 1216篇 |
1993年 | 1212篇 |
1992年 | 2470篇 |
1991年 | 2291篇 |
1990年 | 2303篇 |
1989年 | 2102篇 |
1988年 | 2060篇 |
1987年 | 1994篇 |
1986年 | 1984篇 |
1985年 | 2063篇 |
1984年 | 1796篇 |
1983年 | 1577篇 |
1979年 | 1830篇 |
1978年 | 1339篇 |
1975年 | 1548篇 |
1974年 | 1676篇 |
1973年 | 1793篇 |
1972年 | 1549篇 |
1971年 | 1409篇 |
1970年 | 1263篇 |
1969年 | 1269篇 |
1968年 | 1606篇 |
1967年 | 1430篇 |
1966年 | 1327篇 |
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
41.
Christopher D. Adams Anthony Dickinson 《The Quarterly Journal of Experimental Psychology Section B: Comparative and Physiological Psychology》1981,33(2):109-121
In two experiments, hungry rats were given instrumental lever-press training for an appetitive reinforcer and, in addition, were exposed to another type of food which was not contingent on lever pressing. In the first experiment, exposure to each type of food was on separate days, whereas in the second experiment rats were exposed to each type of food in strict alternation within each session. Subsequently, a food aversion was conditioned to the reinforcer for the experimental group and to the non-contingent food for the control group. In both experiments, animals with an aversion to the reinforcer responded less in an extinction test than animals with an aversion to the non-contingent food. Subsequent reacquisition tests confirmed that the aversion to the non-contingent food in the control group was of comparable strength with that to the reinforcer in the experimental group. The results were discussed in terms of whether the reinforcer is encoded in the associative structure set up by exposure to an instrumental contingency. 相似文献
42.
43.
44.
45.
46.
47.
Inge M. Wetzer Marcel Zeelenberg Rik Pieters 《European journal of social psychology》2007,37(6):1310-1324
We test the emotion-response congruency hypothesis, which predicts that the consequences of socially sharing one's negative emotions depend on the congruency between the shared emotion and the response that is obtained from the interaction partner. Experiment 1a shows that the response that people prefer is dependent on the specific emotion shared. Experiment 1b, however, reveals that the responses that interaction partners provide do not differ across emotions. Yet, and crucially, Experiment 2 shows that the outcomes of sharing are affected by the congruency between the response that people receive and the emotion they share, thus supporting the emotion-response congruency hypothesis. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
48.
49.
Linda J Koenig Sherri L Pals Tim Bush Melody Pratt Palmore Dale Stratford Tedd V Ellerbrock 《Health psychology》2008,27(2):159-169
OBJECTIVE: Compare the efficacy of a multicomponent social support intervention to standard-of-care counseling on medication adherence among HIV-infected patients initiating antiretroviral therapy. DESIGN: Randomized controlled trial. Generalized estimating equations tested for differences in the percentage of participants achieving 90% adherence. MAIN OUTCOME MEASURES: Pill-taking, electronically monitored over 6 consecutive months; plasma viral load (VL), assessed at 3 and 6 months following initiation of therapy. RESULTS: Of 226 participants who were randomized and began the trial, 87 (38%) were lost to the study by 6 months. The proportion of adherent participants declined steadily over time, with no time by group interaction. Sustained adherence was associated with increased odds of achieving an undetectable VL (OR=1.78; 95% CI=1.01, 3.13). In intention-to-treat analyses, a larger proportion of the intervention group than the control group was adherent (40.15% vs. 27.59%, p=.02) and achieved an undetectable VL p=.04). However, the majority of participants who remained on study experienced some reduction in VL (>or=1-log drop or undetectable), regardless of experimental condition. CONCLUSION: The multicomponent social support intervention significantly improved medication adherence over standard-of-care counseling; evidence for improved virologic outcomes was inconsistent. Early discontinuation of care and treatment may be a greater threat to the health of HIV patients than imperfect medication-taking. 相似文献
50.
This study examined the role of illness uncertainty in pain coping among women with fibromyalgia (FM), a chronic pain condition of unknown origin. Fifty-one FM participants completed initial demographic and illness uncertainty questionnaires and underwent 10-12 weekly interviews regarding pain, coping difficulty, and coping efficacy. Main outcome measures included weekly levels of difficulty coping with FM symptoms and coping efficacy. Multilevel analyses indicated that pain elevations for those high in illness uncertainty predicted increases in coping difficulty. Furthermore, when participants had more difficulty coping, they reported lower levels of coping efficacy. Results were consistent with hypothesized effects. Illness uncertainty accompanied by episodic pain negatively influenced coping efficacy, an important resource in adaptation to FM. 相似文献