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   9356篇
  免费   529篇
  国内免费   47篇
耳鼻咽喉   87篇
儿科学   279篇
妇产科学   211篇
基础医学   1239篇
口腔科学   196篇
临床医学   668篇
内科学   2401篇
皮肤病学   166篇
神经病学   1132篇
特种医学   390篇
外科学   1020篇
综合类   13篇
一般理论   1篇
预防医学   603篇
眼科学   116篇
药学   607篇
中国医学   12篇
肿瘤学   791篇
  2023年   77篇
  2022年   66篇
  2021年   241篇
  2020年   152篇
  2019年   176篇
  2018年   406篇
  2017年   288篇
  2016年   285篇
  2015年   324篇
  2014年   359篇
  2013年   533篇
  2012年   605篇
  2011年   497篇
  2010年   389篇
  2009年   348篇
  2008年   488篇
  2007年   471篇
  2006年   457篇
  2005年   437篇
  2004年   439篇
  2003年   340篇
  2002年   337篇
  2001年   182篇
  2000年   137篇
  1999年   245篇
  1998年   64篇
  1997年   56篇
  1996年   36篇
  1995年   35篇
  1994年   33篇
  1993年   35篇
  1992年   126篇
  1991年   133篇
  1990年   108篇
  1989年   111篇
  1988年   104篇
  1987年   103篇
  1986年   73篇
  1985年   71篇
  1984年   60篇
  1983年   47篇
  1982年   25篇
  1979年   47篇
  1978年   23篇
  1976年   41篇
  1974年   21篇
  1973年   35篇
  1972年   25篇
  1971年   26篇
  1968年   20篇
排序方式: 共有9932条查询结果,搜索用时 464 毫秒
1.
2.
3.
4.
5.
6.
7.
In this paper, I explore the topic of primitive bodily communications and countertransference enactments, with a particular focus on the part played by bodily odour. To explore this topic, I discuss a two-year treatment with a patient who presented with a mix of borderline and narcissistic diagnostic features. I describe meaningful aspects of the difficulties faced in countertransference work when receiving and making sense of the patient's use of primitive defences and I highlight their expression through a very uncomfortable symptom: an extremely unpleasant bodily smell. My thesis is that the smell communicated preverbal and unsymbolized experiences of early physical and emotional neglect, as well as evacuating the toxicity of those experiences. In this way the smell acted both as a bridge, which could help me reconstruct my patient's early traumatic past, and as a drawbridge, to keep me at distance and maintain his past dissociated. The invasive and aversive nature of the smell can also be seen as representing the approach-avoidance dilemma typical of a disorganized attachment state of mind, acting both as a bridge and as a drawbridge to attachment and relating.  相似文献   
8.

Objective

To explore from a gender perspective the association with subjective health of the interaction between education and household arrangements within the framework of social determinants of health placed at the micro and mezzo levels.

Methods

The data comes from the Spanish sample of the European Union Statistics on Income and Living Conditions for 2014. Independent logistic regression models for men and women were run to analyze the association with subjective health of the interaction between education and household arrangements. An additive model was run to assess possible advantages over the interaction approach.

Results

The interaction models show a lower or even no significant effect on health of household arrangements usually negatively associated with health among individuals with high education, displaying specific patterns according to sex.

Conclusions

Health profiles of women and men are more precisely drawn if both social determinants of health are combined. Among the women, the important role was confirmed of both social determinants of health in understanding their health inequalities. Among the men, mainly those with low educational achievement, the interaction revealed that the household was a more meaningful social determinant of health. This could enable the definition of more efficient public policies to reduce health and gender inequalities.  相似文献   
9.
10.
3D FEA of cemented steel, glass and carbon posts in a maxillary incisor.   总被引:12,自引:0,他引:12  
OBJECTIVES: A comparative study on the stress distribution in the dentine and cement layer of an endodontically treated maxillary incisor has been carried out by using Finite Element Analysis (FEA). The role of post and cement rigidity on reliability of endodontic restorations is discussed. METHODS: A 3D FEM model (13,272 elements and 15,152 nodes) of a central maxillary incisor is presented. A chewing static force of 10 N was applied at 125 degree angle with the tooth longitudinal axis at the palatal surface of the crown. Steel, carbon and glass fiber posts have been considered. The differences in occlusal load transfer ability when steel, carbon and glass posts, fixed to root canal using luting cements of different elastic moduli (7.0 and 18.7 GPa) are discussed. RESULTS AND SIGNIFICANCE: The more stiff systems (steel and carbon posts) have been evaluated to work against the natural function of the tooth. Maximum Von Mises equivalent stress values ranging from 7.5 (steel) to 5.4 and 3.6 MPa (respectively, for carbon posts fixed with high and low cement moduli) and to 2.2 MPa (either for glass posts fixed with high and low cement moduli) have been observed under a static masticatory load of 10 N. A very stiff post works against the natural function of the tooth creating zones of tension and shear both in the dentine and at the interfaces of the luting cement and the post. Stresses in static loading do not reach material (dentine and cement) failure limits, however, they significantly differ leading to different abilities of the restored systems to sustain fatigue loading. The influence of the cement layer elasticity in redistributing the stresses has been observed to be less relevant as the post flexibility is increased.  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