全文获取类型
收费全文 | 23763篇 |
免费 | 968篇 |
国内免费 | 11篇 |
专业分类
24742篇 |
出版年
2020年 | 231篇 |
2019年 | 317篇 |
2018年 | 439篇 |
2017年 | 458篇 |
2016年 | 482篇 |
2015年 | 385篇 |
2014年 | 419篇 |
2013年 | 1968篇 |
2012年 | 759篇 |
2011年 | 780篇 |
2010年 | 467篇 |
2009年 | 434篇 |
2008年 | 588篇 |
2007年 | 660篇 |
2006年 | 544篇 |
2005年 | 522篇 |
2004年 | 498篇 |
2003年 | 493篇 |
2002年 | 517篇 |
2001年 | 769篇 |
2000年 | 735篇 |
1999年 | 568篇 |
1998年 | 242篇 |
1997年 | 219篇 |
1996年 | 244篇 |
1995年 | 220篇 |
1992年 | 456篇 |
1991年 | 452篇 |
1990年 | 430篇 |
1989年 | 411篇 |
1988年 | 425篇 |
1987年 | 380篇 |
1986年 | 394篇 |
1985年 | 394篇 |
1984年 | 311篇 |
1983年 | 278篇 |
1981年 | 209篇 |
1979年 | 351篇 |
1978年 | 256篇 |
1977年 | 216篇 |
1975年 | 281篇 |
1974年 | 355篇 |
1973年 | 367篇 |
1972年 | 288篇 |
1971年 | 282篇 |
1970年 | 281篇 |
1969年 | 251篇 |
1968年 | 349篇 |
1967年 | 307篇 |
1966年 | 284篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
13.
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
14.
Marcellus M Merritt Gary G Bennett Redford B Williams Christopher L Edwards John J Sollers 《Health psychology》2006,25(3):364-369
This study evaluated cardiovascular responses (CVR) to an active speech task with blatantly discriminatory (BRC) versus neutral (NRC) stimuli and an anger recall task in a sample of Black men (N = 73; age 18 to 47). Diastolic blood pressure scores were higher for NRC versus BRC stimuli during anger recall (p = .05). Moreover, persons in the NRC group who perceived high levels of racism (vs. no racism or BRC group) during active speech showed larger increases in blood pressure across postspeech rest, anger recall, and subsequent rest (p = .03). The notable elevation in CVR in response to an ambiguous event extends current models of racism suggesting that subtle racism is a psychosocial stressor that erodes health through chronically elevated CVR. 相似文献
15.
16.
17.
Carol VanZile-Tamsen Maria Testa Lisa L Harlow Jennifer A Livingston 《Health psychology》2006,25(2):249-254
The current study was designed to gain a better understanding of the nature of the relationship between substance use and sexual risk taking within a community sample of women (N = 1,004). Using confirmatory factor analysis, the authors examined the factor structure of sexual risk behaviors and substance use to determine whether they are best conceptualized as domains underlying a single, higher order, risk-taking propensity. A 2 higher order factor model (sexual risk behavior and substance use) provided the best fit to the data, suggesting that these 2 general risk domains are correlated but independent factors. Sensation seeking had large general direct effects on the 2 risk domains and large indirect effects on the 4 first-order factors and the individual indicators. Negative affect had smaller, yet still significant, effects. Impulsivity and anxiety were unrelated to sexual health risk domains. 相似文献
18.
19.
20.
This study examined information communication technologies and workplace friendship dynamics. Employees reported factors that influenced their initiation of friendship with a coworker and reported patterns and perceptions of communication with their workplace friend via different communication methods. Results indicated that personality, shared tasks, and perceived similarity are the most important factors to coworker friendship initiation, and the importance of physical proximity to workplace friendship is diminishing in the electronically connected workplace. Results confirm the primacy of face‐to‐face interaction for workplace friendship initiation and maintenance. E‐mail, phone, and texting were also central to communication among workplace friends. The amount of time spent telecommuting affected workplace friendship initiation and communication. Finally, generational differences were identified with respect to Internet‐based communication methods. 相似文献