首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   58309篇
  免费   2301篇
  国内免费   33篇
  60643篇
  2020年   649篇
  2019年   809篇
  2018年   1170篇
  2017年   1172篇
  2016年   1251篇
  2015年   845篇
  2014年   1011篇
  2013年   5130篇
  2012年   1862篇
  2011年   2017篇
  2010年   1193篇
  2009年   1237篇
  2008年   1853篇
  2007年   1858篇
  2006年   1643篇
  2005年   1490篇
  2004年   1444篇
  2003年   1378篇
  2002年   1398篇
  2001年   1840篇
  2000年   1733篇
  1999年   1378篇
  1998年   743篇
  1997年   663篇
  1996年   604篇
  1995年   615篇
  1994年   569篇
  1993年   601篇
  1992年   1089篇
  1991年   1026篇
  1990年   1006篇
  1989年   917篇
  1988年   884篇
  1987年   874篇
  1986年   871篇
  1985年   925篇
  1984年   759篇
  1983年   676篇
  1982年   546篇
  1981年   511篇
  1980年   517篇
  1979年   745篇
  1978年   581篇
  1976年   549篇
  1975年   665篇
  1974年   702篇
  1973年   673篇
  1972年   593篇
  1968年   577篇
  1967年   571篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
In March 2020, in response to the COVID-19 pandemic, Canadian provincial governments instituted a variety of public health measures that included social distancing and isolation, which may have had unintended consequeses. According to the Loneliness and Sexual Risk Model, gay, bisexual, and other men who have sex with men (GBM) often cope with loneliness through risky sexual behaviors. Previous studies have demonstrated that COVID-19 measures such as social distancing and isolation led to increases in loneliness; thus, these measures may also have led to elevated sexual risk-taking among some GBM. Participants were recruited from an ongoing cohort study on GBM health and well-being, and were included in the current analysis if they had completed relevant study questions (n = 1134). GBM who reported lower levels of social support pre-COVID-19, were younger, and lived alone each reported greater loneliness during the first year of COVID-19. Although feelings of loneliness did not predict sexual risk-taking within the first year of COVID-19, loneliness did predict greater sexual risk-taking 6 months later. Additionally, younger GBM and those living alone were more likely to engage in sexual risk-taking at both COVID-19 data collection points. These findings offer some support of the Loneliness and Sexual Risk Model; however, it is possible that the unique circumstances of the COVID-19 pandemic resulted in a temporary suspension of this association, as many GBM took steps to protect themselves and partners in the context of COVID-19.  相似文献   
992.
Although negative anticipatory emotions are typically seen as risk factors for poorer psychological outcomes over COVID-19, emotion theorists suggest that this risk may be attenuated if balanced by the experience of positive emotion. Thus, the current study examined whether interactions between positive and negative anticipatory emotions were concurrently associated with psychological distress and greater personal wellbeing/posttraumatic growth (PTG) at three distinct periods (i.e., pre-lockdown, during lockdown, post-lockdown), and whether associations varied by these three COVID-19 time periods. The study utilizes two large longitudinal Australian samples, surveyed in 2020 prior to, during, and after a strict 4-month lockdown that occurred in Australia. Overall, positive emotions attenuated the adverse psychological outcomes arising from higher levels of negative emotion (i.e., higher psychological distress and lower personal wellbeing). Observed effects varied according to COVID-19 threat exposure. Specifically, the interaction was significantly associated with psychological distress prior to the lockdown for Sample 2, and during the lockdown for both samples. The interaction was significantly associated with wellbeing (Sample 2) prior to, and during, the lockdown but only marginally associated post-lockdown. The interaction, however, was not significantly associated with PTG (Sample 1). The results suggest that it is valuable for future research to consider greater emotional complexity (i.e., mixed emotions) over COVID-19, and other stressors more generally, to encompass a more nuanced understanding of resilience.  相似文献   
993.
A study and replication of students faking interest in high status occupations on the Strong Vocational Interest Blank for Men. In general, the faking was successful in shifting the specific target occupational scales and especially the occupational level scale. Other scales are affected, many with decisive upward or downward shifts. Demonstration is made of the extent to which the faking condition led to differences in the overall test results. Various aspects of the general problem of test faking are reviewed.  相似文献   
994.
995.
Septum and behavior: a review   总被引:2,自引:0,他引:2  
  相似文献   
996.
997.
998.
999.
1000.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号