全文获取类型
收费全文 | 16133篇 |
免费 | 681篇 |
国内免费 | 13篇 |
专业分类
16827篇 |
出版年
2023年 | 89篇 |
2021年 | 137篇 |
2020年 | 256篇 |
2019年 | 321篇 |
2018年 | 425篇 |
2017年 | 422篇 |
2016年 | 447篇 |
2015年 | 327篇 |
2014年 | 433篇 |
2013年 | 1829篇 |
2012年 | 730篇 |
2011年 | 781篇 |
2010年 | 455篇 |
2009年 | 505篇 |
2008年 | 676篇 |
2007年 | 689篇 |
2006年 | 698篇 |
2005年 | 603篇 |
2004年 | 559篇 |
2003年 | 570篇 |
2002年 | 581篇 |
2001年 | 288篇 |
2000年 | 259篇 |
1999年 | 245篇 |
1998年 | 228篇 |
1997年 | 254篇 |
1996年 | 215篇 |
1995年 | 187篇 |
1994年 | 178篇 |
1993年 | 173篇 |
1992年 | 168篇 |
1991年 | 165篇 |
1990年 | 156篇 |
1989年 | 141篇 |
1988年 | 99篇 |
1987年 | 127篇 |
1986年 | 146篇 |
1985年 | 176篇 |
1984年 | 170篇 |
1983年 | 153篇 |
1982年 | 145篇 |
1981年 | 160篇 |
1980年 | 135篇 |
1979年 | 115篇 |
1978年 | 129篇 |
1977年 | 119篇 |
1976年 | 119篇 |
1975年 | 108篇 |
1974年 | 113篇 |
1973年 | 98篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
The present study tested gender as a moderator of the relationship between race-related stress and mental health symptoms among African American adults. Because African American women are exposed to stressors associated with race and gender, we hypothesized that African American women would have higher levels of race-related stress and more severe mental health outcomes related to experiences of race-related stress compared to African American men. Multivariate analyses revealed that African American men had higher stress appraisals for institutional racism than did women. No significant gender differences were found for cultural and individual racism. Moderated regression analyses revealed that increases in stress appraisals for individual racism were associated with increases in anxiety and obsessive-compulsive symptoms for African American women. Race-related stress had no significant effects on mental health symptoms for African American men. The findings suggest that gender is an important factor in determining the impact of race-related stress on mental health. 相似文献
2.
John M. Pearce David N. George Aydan Aydin 《The Quarterly Journal of Experimental Psychology Section B: Comparative and Physiological Psychology》2002,55(1):61-73
Rats received Pavlovian conditioning in which food was signalled by a visual stimulus, A+, an auditory stimulus, B+, and a compound composed of different visual and auditory stimuli, CD+. Test trials were then given with the compound AB. Experiments 1 and 2A revealed stronger responding during AB than during CD. In Experiment 2B, there was no evidence of a summation of responding during AB when A+ B+ training was conducted in the absence of CD+ trials. A further failure to observe abnormally strong responding during ABwas found in Experiment 3 for which the training trials with A+ B+ CD+ were accompanied by trials in which C and D were separately paired with food. The results are explained in terms of a configural theory of conditioning, which assumes that responding during a compound is determined by generalization from its components, as well as from other compounds to which it is similar. 相似文献
3.
David Boonin 《Journal of applied philosophy》2000,17(2):157-168
Most arguments against active euthanasia, as do most arguments in applied ethics generally, take place within the framework of what can broadly be referred to as a modern, as opposed to an ancient, approach to moral theory. In this paper, I argue that this fact works to the disadvantage of opponents of active euthanasia, and that if there is a successful argument against active euthanasia, it will be of the latter sort. In Part I, I attempt to clarify thedistinction between modern and ancient approaches with which I am concerned. In Part II, I attempt to show that any argument against active euthanasia that is of the first sort is bound to fail. In Part III, I propose an argument against active euthanasia of the second sort that I believe has a better chance for success. In Part IV, I consider some objections that can be raised against this argument and attempt to show how they can be overcome. 相似文献
4.
5.
6.
7.
8.
9.
Abby C King Bess Marcus David Ahn Andrea L Dunn W Jack Rejeski James F Sallis Mace Coday 《Health psychology》2006,25(3):336-347
The authors used recursive partitioning methods to identify combinations of baseline characteristics that predict 2-year physical activity success in each of 3 physical activity interventions delivered in the multisite Activity Counseling Trial. The sample consisted of 874 initially sedentary primary care patients, ages 35-75 years, who were at risk for cardiovascular disease. Predictors of 2-year success were specific to each intervention and represented a range of domains, including physiological, demographic, psychosocial, health-related, and environmental variables. The results indicate how specific patient subgroups (e.g., obese, unfit individuals; high-income individuals in stable health) may respond differently to varying levels and amounts of professional assistance and support. The methods used provide a practical first step toward identifying clinically meaningful patient subgroups for further systematic investigation. 相似文献
10.