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   49666篇
  免费   1988篇
  国内免费   18篇
  2020年   555篇
  2019年   719篇
  2018年   961篇
  2017年   1045篇
  2016年   1072篇
  2015年   740篇
  2014年   932篇
  2013年   4313篇
  2012年   1680篇
  2011年   1710篇
  2010年   1104篇
  2009年   1074篇
  2008年   1582篇
  2007年   1558篇
  2006年   1421篇
  2005年   1311篇
  2004年   1262篇
  2003年   1178篇
  2002年   1224篇
  2001年   1385篇
  2000年   1290篇
  1999年   1063篇
  1998年   579篇
  1997年   582篇
  1996年   499篇
  1995年   521篇
  1994年   504篇
  1993年   502篇
  1992年   894篇
  1991年   779篇
  1990年   838篇
  1989年   720篇
  1988年   746篇
  1987年   730篇
  1986年   711篇
  1985年   685篇
  1984年   688篇
  1983年   658篇
  1982年   526篇
  1981年   486篇
  1979年   695篇
  1978年   561篇
  1977年   488篇
  1976年   477篇
  1975年   588篇
  1974年   640篇
  1973年   644篇
  1972年   482篇
  1968年   544篇
  1967年   486篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
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   
52.
53.
54.
55.
56.
57.
58.
59.
OBJECTIVE: This report reviews the evidence that informs the role of health and mental health care providers in addressing youth smoking cessation. DESIGN: Qualitative literature review. RESULTS: Physicians do not consistently screen adolescents for tobacco use and fail to provide recommended cessation advice. Challenges to addressing smoking cessation include the need for procedures to ensure confidentiality and the existence of competing demands to provide other services. Few published studies have specifically addressed the effectiveness of clinical interventions. Interventions that require return visits or follow-up phone contacts are technically difficult to implement in this population. Successful interventions may require resources not available in nonresearch settings. Most studies have used brief clinical intervention as a control condition, making it impossible to evaluate its effectiveness. CONCLUSION: There is little evidence that supports current clinical smoking cessation guidelines for adolescents. More research is needed to develop inexpensive, efficient clinical interventions that can provide youths access to smoking cessation help. Future challenges include reorganizing clinical systems to offer greater counseling by support staff or in electronic formats and to provide effective booster messages and follow-up care in a population that is difficult to track.  相似文献   
60.
Previous work on children's intuitive knowledge about the natural world has documented their difficulty in acquiring an overarching concept of biological life that includes plants as well as humans and non‐human animals. It has also suggested that the acquisition of fundamental biological concepts like alive and die may be influenced by the language used to describe them, as evidenced by differences between English‐ and Indonesian‐speaking children's performance in tasks involving these concepts. Here, we examine one particularly important source of linguistic information available to children during this acquisition process: everyday conversations with their parents. We take a cross‐linguistic approach in analysing the evidence available to English‐ and Indonesian‐speaking children as they acquire meanings for words corresponding to the concepts alive and die . Our analysis illustrates that young children acquiring English and Indonesian are faced with distinct problems, but that parental input in both languages does little to support the acquisition of broad, inclusive biological concepts.  相似文献   
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