全文获取类型
收费全文 | 52269篇 |
免费 | 4277篇 |
国内免费 | 1584篇 |
专业分类
耳鼻咽喉 | 617篇 |
儿科学 | 635篇 |
妇产科学 | 1086篇 |
基础医学 | 8149篇 |
口腔科学 | 1412篇 |
临床医学 | 4353篇 |
内科学 | 10015篇 |
皮肤病学 | 1000篇 |
神经病学 | 3756篇 |
特种医学 | 1692篇 |
外国民族医学 | 6篇 |
外科学 | 7302篇 |
综合类 | 3969篇 |
现状与发展 | 1篇 |
一般理论 | 5篇 |
预防医学 | 2954篇 |
眼科学 | 1373篇 |
药学 | 4713篇 |
中国医学 | 755篇 |
肿瘤学 | 4337篇 |
出版年
2023年 | 196篇 |
2022年 | 317篇 |
2021年 | 545篇 |
2020年 | 348篇 |
2019年 | 621篇 |
2018年 | 1124篇 |
2017年 | 868篇 |
2016年 | 862篇 |
2015年 | 966篇 |
2014年 | 1280篇 |
2013年 | 1577篇 |
2012年 | 2144篇 |
2011年 | 2079篇 |
2010年 | 1252篇 |
2009年 | 1233篇 |
2008年 | 1838篇 |
2007年 | 1948篇 |
2006年 | 1812篇 |
2005年 | 1488篇 |
2004年 | 1353篇 |
2003年 | 1331篇 |
2002年 | 1264篇 |
2001年 | 4627篇 |
2000年 | 4539篇 |
1999年 | 3906篇 |
1998年 | 1374篇 |
1997年 | 998篇 |
1996年 | 607篇 |
1995年 | 500篇 |
1994年 | 449篇 |
1993年 | 412篇 |
1992年 | 1931篇 |
1991年 | 1674篇 |
1990年 | 1527篇 |
1989年 | 1488篇 |
1988年 | 1296篇 |
1987年 | 1190篇 |
1986年 | 1063篇 |
1985年 | 899篇 |
1984年 | 588篇 |
1983年 | 467篇 |
1982年 | 249篇 |
1981年 | 180篇 |
1980年 | 141篇 |
1979年 | 280篇 |
1978年 | 77篇 |
1976年 | 67篇 |
1974年 | 76篇 |
1973年 | 95篇 |
1972年 | 71篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
In this paper the immunosuppressive effects of Gui Zhi Tang (a famous Chinese medicine) on the murine immune functions are reported. Varying dosages of Gui Zhi Tang administrated orally, i.p. and i.m. were able to inhibit the amounts of PFC, SRFC and the DTH response induced by BSA and the proliferation response of murine spleen cells to Con A and LPS. Further studies showed that Gui Zhi Tang had the inhibitory effect on Interleukin-2 production of murine spleen cells, which might be one of the mechanisms leading to the immunosuppressive effects of Gui Zhi Tang. 相似文献
72.
73.
74.
75.
N Curcó† X Pagerols† M García† X Tarroch‡ P Vives† 《Journal of the European Academy of Dermatology and Venereology》2006,20(3):331-333
A 40-year-old man presented a painful haemorrhagic plaque on his chest in the same location where a nodular lesion had been presented for many years. After 2 months, the plaque was replaced by a depressed lesion. The lesion diagnosed as an anetoderma was excised and the biopsy showed an atrophic dermatofibroma accompanied by aneurysmatic characteristics. 相似文献
76.
77.
78.
X. Sun MD 《Intensive care medicine》1992,18(4):252-253
79.
Is the P300 deficit in alcoholism associated with early visual impairments (P100, N170)? An oddball paradigm 总被引:2,自引:0,他引:2
P Maurage P Philippot P Verbanck X Noel C Kornreich C Hanak S Campanella 《Clinical neurophysiology》2007,118(3):633-644
OBJECTIVE: Studies exploring chronic alcoholism with event-related potentials (ERPs) have shown delayed latency and reduced amplitude of the P300, a long-lasting positive potential reflecting decisional processing. This P300 deficit in alcoholism is generally interpreted as a disturbance in central nervous system inhibition or in memory/attention. The present study aimed at identifying if this electrophysiological deficit is already present on earlier components, and advances a new hypothesis concerning the interpretation of the P300 alteration. METHODS: Patients suffering from alcoholism and matched healthy controls had to detect, in an oddball paradigm, emotional faces among a succession of neutral faces. Behavioral performance and ERP data (recorded from 32 electrodes) were analyzed. RESULTS: In line with previous studies, data showed that alcoholism led to a P300 deficit. Moreover, we observed for the first time that this deficit begins at earlier visual (P100) and face-processing (N170) stages, and we found high positive correlations between P100, N170 and P300 for amplitude and latency values, suggesting cumulative deficits on the cognitive continuum. CONCLUSIONS: We suggest that the P300 deficit observed in chronic alcoholism could be linked to earlier visuo-spatial deficits rather than being an impairment of the specific processes linked to the P300. SIGNIFICANCE: These results call for reconsidering the interpretation of P300 impairments at a fundamental and clinical level, and shows that earlier ERP components must be taken into account in future studies. 相似文献
80.
In this paper, we address the problem of stable tracking control of a flexible macro-micro manipulator (M(3)) system. A two-layer neural network is utilized to approximate the nonlinear robot dynamic behavior of the M(3) system, and the controllers for the macro and micro arms are developed without any need for prior knowledge of the dynamic model of the controlled M(3) system. A learning algorithm for the neural network using Lyapunov stability theory is derived. It is shown that both the tracking error and the weight-tuning error are uniformly ultimately bounded under this new control scheme. Simulation results are presented and compared to those obtained using a PD controller. 相似文献