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   2347250篇
  免费   175166篇
  国内免费   5813篇
耳鼻咽喉   32258篇
儿科学   77703篇
妇产科学   67024篇
基础医学   344265篇
口腔科学   65478篇
临床医学   216355篇
内科学   453188篇
皮肤病学   47954篇
神经病学   189874篇
特种医学   88030篇
外国民族医学   697篇
外科学   343098篇
综合类   51263篇
现状与发展   2篇
一般理论   731篇
预防医学   188795篇
眼科学   53314篇
药学   176431篇
  7篇
中国医学   5100篇
肿瘤学   126662篇
  2018年   25411篇
  2017年   19148篇
  2016年   21176篇
  2015年   24264篇
  2014年   33443篇
  2013年   51512篇
  2012年   70609篇
  2011年   75328篇
  2010年   44232篇
  2009年   41011篇
  2008年   70540篇
  2007年   75295篇
  2006年   76080篇
  2005年   74015篇
  2004年   70813篇
  2003年   67914篇
  2002年   66358篇
  2001年   103894篇
  2000年   106586篇
  1999年   90163篇
  1998年   26002篇
  1997年   23460篇
  1996年   23391篇
  1995年   22139篇
  1994年   20868篇
  1993年   19457篇
  1992年   72491篇
  1991年   71422篇
  1990年   69770篇
  1989年   67105篇
  1988年   62338篇
  1987年   60879篇
  1986年   58193篇
  1985年   55665篇
  1984年   41813篇
  1983年   35961篇
  1982年   21703篇
  1981年   19243篇
  1979年   39039篇
  1978年   27653篇
  1977年   23326篇
  1976年   22478篇
  1975年   23863篇
  1974年   28570篇
  1973年   27853篇
  1972年   26153篇
  1971年   24272篇
  1970年   22602篇
  1969年   21286篇
  1968年   20107篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
35.
36.
Background: Lay belief systems about the malleability of human attributes have been shown to impact behavior change in multiple domains. Addiction mindset—i.e., beliefs about the permanence (vs. malleability) of addiction — may affect cigarette smokers’ ability to quit, but this has never been examined. Objectives: The aims of the present research were to develop a measure of addiction mindset (study 1) and examine its associations with various psychological aspects of quitting smoking (study 2). Methods: In Study 1, using factor analysis of current smokers’ and nonsmokers’ (n?=?600) responses to 22 items designed to measure addiction mindset, we developed a reliable six-item Addiction Mindset Scale (AMS). In Study 2, adult smokers (n?=?200) completed the AMS, and measures of a number of psychological processes related to smoking. Results: Higher scores on the AMS, indicative of the belief that addiction is malleable (referred to as a growth mindset), were positively and significantly associated with greater motivation to quit, greater commitment to quitting, greater self-efficacy to abstain, less attribution of failure to lack of ability to change addiction, and fewer self-reported barriers to cessation (all p’s < .05). Conclusions: The results of this study show a relationship between the beliefs about the permanence of addiction and psychological processes relevant to quitting smoking. The findings underscore the potential of future research exploring how addiction mindsets relate to successful smoking cessation as well as other types of addictive behavior and how they can be applied to change people’s behavior.  相似文献   
37.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  相似文献   
38.
To determine percent of patients without malignancy and ≤ 40 years of age with high cumulative radiation doses through recurrent CT exams and assess imaging appropriateness. From the cohort of patients who received cumulative effective dose (CED) of ≥ 100 mSv over a 5-year period, a sub-set was identified with non-malignant disease. The top 50 clinical indications leading to multiple CTs were determined. Clinical decision support (CDS) system scores were analyzed using a widely adopted standard of 1–3 (red) as “not usually appropriate,” 4–6 (yellow) “may or may not be appropriate,” and 7–9 (green) “usually appropriate.” Clinicians reviewed patient records to assess compliance with appropriate use criteria (AUC). 9.6% of patients in our series were with non-malignant conditions and 1.4% with age ≤ 40 years. CDS scores (rounded) were 2% red, 38% yellow, 27% green, and 33% unscored CTs. Clinical society guidelines for CT exams, wherever available, were followed in 87.5 to 100% of cases. AUCs were not available for several clinical indications as also referral guidelines for serial CT imaging. More than half of CT exams were unrelated to follow-up of a primary chronic disease. We are faced with a situation wherein patients in age ≤ 40 years require or are thought to require many CT exams over the course of a few years but the radiation risk creates concern. There is a fair number of conditions for which AUC are not available. Suggested solutions include development of CT scanners with lesser radiation dose and further development of appropriateness criteria.  相似文献   
39.
40.
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