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   7845篇
  免费   435篇
  国内免费   69篇
耳鼻咽喉   100篇
儿科学   193篇
妇产科学   27篇
基础医学   809篇
口腔科学   188篇
临床医学   514篇
内科学   2033篇
皮肤病学   206篇
神经病学   473篇
特种医学   303篇
外科学   1384篇
综合类   35篇
预防医学   180篇
眼科学   351篇
药学   635篇
中国医学   10篇
肿瘤学   908篇
  2024年   8篇
  2023年   48篇
  2022年   91篇
  2021年   225篇
  2020年   132篇
  2019年   165篇
  2018年   242篇
  2017年   175篇
  2016年   215篇
  2015年   218篇
  2014年   263篇
  2013年   325篇
  2012年   553篇
  2011年   584篇
  2010年   351篇
  2009年   291篇
  2008年   520篇
  2007年   519篇
  2006年   509篇
  2005年   473篇
  2004年   437篇
  2003年   401篇
  2002年   412篇
  2001年   89篇
  2000年   99篇
  1999年   131篇
  1998年   84篇
  1997年   69篇
  1996年   70篇
  1995年   53篇
  1994年   43篇
  1993年   35篇
  1992年   51篇
  1991年   51篇
  1990年   34篇
  1989年   48篇
  1988年   47篇
  1987年   37篇
  1986年   26篇
  1985年   45篇
  1984年   33篇
  1983年   18篇
  1982年   18篇
  1981年   21篇
  1980年   13篇
  1979年   14篇
  1975年   7篇
  1968年   6篇
  1967年   5篇
  1966年   7篇
排序方式: 共有8349条查询结果,搜索用时 15 毫秒
1.
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   
2.
3.
4.
We examined stochastic resonance with a differential coding scheme using a multilayer feedforward neural network which is composed of intra-layer connections. We show that the network, with random synaptic connections in each layer, encodes an input signal into a spike coherence that represents temporal differences among the inputs. We also demonstrate that both internal and external noise enhance the detection of weak signals. Finally, we discuss how the feedforward network with intra-layer random connections is similar to a membrane in its sensitivity to and amplification of a change in stimulus and suggest that the intensity of internal noise may be tuned in a real brain.  相似文献   
5.
To elucidate the effects of teeth on muscle fibers in the tongue during the developmental process, we examined the expression of muscle contractile proteins and the genes for those proteins in normal mice and microphthalmic (mi/mi) mice with impaired tooth eruption. The mice were observed during the growth period, including weaning, which is when feeding movements undergo major changes. Expression of the myosin heavy chain (MyHC)-2a protein, whose contraction speed is relatively slow, disappeared after weaning in normal mice, while it remained in high concentrations even after weaning in mi/mi mice. The presence of MyHC-2a after weaning in mice with no tooth eruption was attributed to a compensation for lack of proper masticatory function and sucking-like movements, as MyHC-2a is necessary for these movements.  相似文献   
6.
7.
8.
Renal cell carcinoma (RCC) causes many kinds of symptoms such as hypercalcemia, hypertension, polycythemia and fever. Here we describe a rare case of RCC presenting with a persistent cough. After radical nephrectomy, the obstinate cough disappeared. When the tumor recurred locally, the cough also recurred. Furthermore, the cough disappeared completely again after the removal of the recurrent tumor. Although all the clinical findings suggested that the RCC caused the cough, we could not identify a specific humoral substance responsible for the cough.  相似文献   
9.
10.
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