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   25233篇
  免费   2347篇
  国内免费   516篇
耳鼻咽喉   424篇
儿科学   779篇
妇产科学   455篇
基础医学   2986篇
口腔科学   354篇
临床医学   2666篇
内科学   3973篇
皮肤病学   373篇
神经病学   2194篇
特种医学   1187篇
外国民族医学   2篇
外科学   2294篇
综合类   2505篇
现状与发展   1篇
一般理论   4篇
预防医学   3192篇
眼科学   874篇
药学   1240篇
  13篇
中国医学   847篇
肿瘤学   1733篇
  2024年   26篇
  2023年   569篇
  2022年   703篇
  2021年   1440篇
  2020年   1224篇
  2019年   1293篇
  2018年   1155篇
  2017年   1035篇
  2016年   985篇
  2015年   848篇
  2014年   1640篇
  2013年   1878篇
  2012年   1282篇
  2011年   1390篇
  2010年   1099篇
  2009年   1091篇
  2008年   1121篇
  2007年   1154篇
  2006年   939篇
  2005年   869篇
  2004年   720篇
  2003年   677篇
  2002年   560篇
  2001年   469篇
  2000年   372篇
  1999年   359篇
  1998年   321篇
  1997年   314篇
  1996年   212篇
  1995年   224篇
  1994年   202篇
  1993年   189篇
  1992年   167篇
  1991年   128篇
  1990年   131篇
  1989年   133篇
  1988年   107篇
  1987年   116篇
  1986年   108篇
  1985年   139篇
  1984年   122篇
  1983年   95篇
  1982年   96篇
  1981年   78篇
  1980年   70篇
  1979年   66篇
  1978年   42篇
  1977年   40篇
  1975年   18篇
  1973年   19篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Although depression is associated to physical discomfort, meanings of the body in depression are rarely addressed in clinical research. Drawing on the concept of the lived body, this study explores depression as an embodied phenomenon. Using a hermeneutic phenomenological approach, the analysis of narrative‐based interviews with 11 depressed adults discloses a thematic structure of an embodied process of an ambiguous striving against fading. Five subthemes elicit different dimensions of this process, interpreted as disabling or enabling: feeling estranged, feeling confined, feeling burdensome, sensing life and seeking belongingness. In relation to clinical practice, we suggest that the interdisciplinary team can focus on enhancing the enabling dimensions, for example through guided physical activities to support the patient to feel more alive, capable and connected. Moreover, we suggest that the treatment process benefits from an increased awareness of the ambiguity in the patient's struggle, acknowledging both destructive and recharging elements of the withdrawing, and the perceived conflict in‐between.  相似文献   
3.
肺癌是发病率和死亡率最高的恶性肿瘤,其脑转移发生率高且预后差。近年来随着靶向以及免疫治疗药物相继研制成功,肺癌原发灶局部控制率得以提升,因此对其脑转移的治疗更加关注。放射治疗是肺癌脑转移治疗的重要手段之一,现将肺癌脑转移放射治疗方式及进展进行综述。  相似文献   
4.
5.
        绝经是一个古老的概念,见诸于文献,最早可以追溯到春秋时期中医的重要文献之一《黄帝内经》。其中,《素问·上古天真论》有这样的描述:“女子二七而天葵至,任脉通,太冲脉盛,月事以时下,故有子……七七任脉虚,太冲脉衰少,天葵竭,地道不通,故形坏而无子也。”绝经是卵巢功能衰竭所造成的一种生命现象,从理论上讲,经过长期的进化的洗礼,人体所有的器官和组织,都是维持人体生命活动不可或缺的重要组成部分。时至今日,在不同的流行病学调查中,女性平均绝经年龄仍保持在50岁左右[1-2],可谓亘古未变,而变化的是人类寿命的延长,2018年北京女性预期寿命已经达84.63岁。 浏览更多请关注本刊微信公众号及当期杂志。  相似文献   
6.
7.
This retrospective study aimed to evaluate radiation-induced pneumonitis (RIP) and a related condition that we define in this report—prolonged minimal RIP (pmRIP)—after stereotactic body radiotherapy (SBRT) for Stage I primary lung cancer in patients with chronic obstructive pulmonary disease (COPD). We assessed 136 Stage I lung cancer patients with COPD who underwent SBRT. Airflow limitation on spirometry was classified into four Global Initiative for Chronic Obstructive Lung Disease (GOLD) grades, with minor modifications: GOLD 1 (mild), GOLD 2 (moderate), GOLD 3 (severe) and GOLD 4 (very severe). On this basis, we defined two subgroups: COPD-free (COPD −) and COPD-positive (COPD +). There was no significant difference in overall survival or cause-specific–survival between these groups. Of the 136 patients, 44 (32%) had pmRIP. Multivariate analysis showed that COPD and the Brinkman index were statistically significant risk factors for the development of pmRIP. COPD and the Brinkman index were predictive factors for pmRIP, although our findings also indicate that SBRT can be tolerated in early lung cancer patients with COPD.  相似文献   
8.
Responsive feeding (RF) has been recognized as necessary to prevent all forms of malnutrition including stunting and childhood obesity. Specific RF guidelines have been developed, but it is unclear how RF behaviours can be monitored systematically. Therefore, developing valid and reliable abbreviated and pragmatic RF scales is an important global priority. This is challenging, as RF is a construct with multiple dimensions including recognizing and responding to hunger and satiety cues, providing a nurturing environment during feeding episodes, and understanding how feeding needs evolve as a function of the developmental stage of the young child. Further, RF is embedded within the responsive parenting framework that in addition to RF includes sleep, soothing and play routines and the interconnections between them. A recent pioneer study conducted in a rural area of Cambodia validated an 8‐item RF scale through direct feeding observations of 6‐ to 23‐month‐old infants at home, as part of two cross‐sectional surveys conducted before and after a complementary feeding intervention. It is important for similar research to be conducted elsewhere to find out if it is possible or not to develop a core RF scale that is valid and reliable and that has adequate specificity and sensitivity for application in community studies and population surveys globally. As highlighted in this article, different definitions of RF have been used in the field; thus, it is important to reach consensus on a single definition to help move this research area forward.  相似文献   
9.

Purpose

Chest wall pain is an uncommon but bothersome late complication following lung stereotactic body radiation therapy. Despite numerous studies investigating predictors of chest wall pain, no clear consensus has been established for a chest wall constraint. The aim of our study was to investigate factors related to chest wall pain in a homogeneous group of patients treated at our institution.

Patients and methods

All 122 patients were treated with the same stereotactic body radiation therapy regimen of 48 Gy in three fractions, seen for at least 6 months of follow-up, and planned with heterogeneity correction. Chest wall pain was scored according to the Common Terminology Criteria for Adverse Events classification v3.0. Patient (age, sex, diabetes, osteoporosis), tumour (planning target volume, volume of the overlapping region between planning target volume and chest wall) and chest wall dosimetric parameters (volumes receiving at least 30, 40, and 50 Gy, the minimal doses received by the highest irradiated 1, 2, and 5 cm3, and maximum dose) were collected. The correlation between chest wall pain (grade 2 or higher) and the different parameters was evaluated using univariate and multivariate logistic regression.

Results

Median follow-up was 18 months (range: 6–56 months). Twelve patients out of 122 developed chest wall pain of any grade (seven with grade 1, three with grade 2 and two with grade 3 pain). In univariate analysis, only the volume receiving 30 Gy or more (P = 0.034) and the volume of the overlapping region between the planning target volume and chest wall (P = 0.038) significantly predicted chest wall pain, but these variables were later proved non-significant in multivariate regression.

Conclusion

Our analysis could not find any correlation between the studied parameters and chest wall pain. Considering our present study and the wide range of differing results from the literature, a reasonable conclusion is that a constraint for chest wall pain is yet to be defined.  相似文献   
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