全文获取类型
收费全文 | 10112篇 |
免费 | 1221篇 |
国内免费 | 673篇 |
专业分类
耳鼻咽喉 | 29篇 |
儿科学 | 64篇 |
妇产科学 | 25篇 |
基础医学 | 747篇 |
口腔科学 | 203篇 |
临床医学 | 542篇 |
内科学 | 1188篇 |
皮肤病学 | 71篇 |
神经病学 | 391篇 |
特种医学 | 168篇 |
外国民族医学 | 4篇 |
外科学 | 553篇 |
综合类 | 2055篇 |
现状与发展 | 3篇 |
预防医学 | 1216篇 |
眼科学 | 163篇 |
药学 | 2005篇 |
7篇 | |
中国医学 | 2178篇 |
肿瘤学 | 394篇 |
出版年
2024年 | 137篇 |
2023年 | 377篇 |
2022年 | 855篇 |
2021年 | 862篇 |
2020年 | 698篇 |
2019年 | 491篇 |
2018年 | 404篇 |
2017年 | 417篇 |
2016年 | 399篇 |
2015年 | 387篇 |
2014年 | 628篇 |
2013年 | 686篇 |
2012年 | 678篇 |
2011年 | 690篇 |
2010年 | 523篇 |
2009年 | 451篇 |
2008年 | 442篇 |
2007年 | 459篇 |
2006年 | 345篇 |
2005年 | 300篇 |
2004年 | 249篇 |
2003年 | 223篇 |
2002年 | 183篇 |
2001年 | 117篇 |
2000年 | 123篇 |
1999年 | 84篇 |
1998年 | 68篇 |
1997年 | 72篇 |
1996年 | 56篇 |
1995年 | 61篇 |
1994年 | 53篇 |
1993年 | 52篇 |
1992年 | 45篇 |
1991年 | 36篇 |
1990年 | 39篇 |
1989年 | 27篇 |
1988年 | 39篇 |
1987年 | 29篇 |
1986年 | 31篇 |
1985年 | 32篇 |
1984年 | 24篇 |
1983年 | 18篇 |
1982年 | 27篇 |
1981年 | 15篇 |
1980年 | 12篇 |
1979年 | 13篇 |
1978年 | 10篇 |
1977年 | 7篇 |
1976年 | 13篇 |
1975年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
介绍了多孔结构乳胶粒的制备方法、表征手段以及成孔机理。着重阐述了“碱酸分段处理法”中不饱和酸与交联剂的种类与用量、以及碱酸处理条件等因素对乳胶粒成孔的影响。 相似文献
63.
研究了以甲基丙烯酸酯端基不饱和取酯树脂为主链,用甲基丙烯酸甲酯取代苯乙烯作为交联剂制成的甲基丙烯酸酯树脂(MAER)与通用型不饱和聚酯树脂(GUPR)的热裂解机理、燃烧现象。结果表明:MAER的裂角产物中苯环化合物含量(14.9%)少于GUPR(74.5%)。MAER燃烧时的发烟量和毒性也远低于GUPR。在MAER中加入三水合氧化铝(ATH)后,裂解产物中有毒物质的各类和数量更少,在燃烧时只有少量 相似文献
64.
周学胜 《南京中医药大学学报》2000,16(1):8-10
非药物疗法是中医治疗学中的一个重要组成部分.<内经>中的非药物疗法,通过协调阴阳平衡、调和气血运行、调节神志活动、调整脏腑功能等作用,对防病治病、养生益寿有重要意义. 相似文献
65.
The effect of accident mechanisms and initial findings on the long-term course of whiplash injury 总被引:6,自引:0,他引:6
Matthias Sturzenegger Bogdan P. Radanov Giuseppe Di Stefano 《Journal of neurology》1995,242(7):443-449
The aim of this study was to assess the relationships between accident mechanisms as well as initial findings and the long-term course of whiplash injury. A representative sample of 117 consecutive patients referred by primary care physicians was followed-up over 12 months. Fractures or dislocations of the cervical spine, head trauma and pre-existing neurological disorders were exclusion criteria. The interval between the accident and the baseline examination was 7.4 days (SD 4.2 days). Assessment included accident features (e.g. passenger position in the car, head restraint, head position, type of collision), initial symptoms (e.g. intensity and onset of pain, symptoms of neurological dysfunction, multiple symptom score), and signs (restricted neck movement, neurological deficits). At the 1-year examination, patients were divided into an asymptomatic and a symptomatic group and were compared with respect to accident features and baseline findings. Twenty-four percent of patients were still symptomatic after 1 year. Analysing accident mechanisms separately, rotated or inclined head position was the primary feature related to symptom persistence (P=0.005). The symptomatic group scored higher at baseline on the multiple symptom rating (P=0.004) and had a higher incidence of initial headache (P=0.004) and neurological symptoms (P=0.008) together with a higher intensity of headache (P=0.0002) and neck pain (P=0.0009). The following set of initial variables predicted persistence of symptoms at 1 year (logistic regression): intensity of neck pain (P=0.001) and headache (P=0.009), rotated or inclined head position (P=0.02), unpreparedness at the time of impact (P=0.01) and car stationary when hit (P=0.01). In conclusion, accident mechanisms and initial findings suggestive of more severe injury were significantly related to long-term persistence of symptoms after whiplash injury.This study was supported by the Swiss National Science Foundation (project number: 3.883-0.88) and the Swiss Accident Insurance Company (Schweizerische Unfallversicherungsanstalt), Berne 相似文献
66.
T. Friden T. Erlandsson R. Zätterström A. Lindstrand U. Moritz 《Knee surgery, sports traumatology, arthroscopy》1995,3(3):144-147
100 consecutive patients with a recent anterior cruciate ligament injury were examined with respect to type of sports activity that caused the injury, mechanism of injury and the occurrence of collateral ligament and meniscal lesions. There were 53 medial collateral ligament injuries, 12 medial, 35 lateral and 11 bicompartmental meniscal lesions. 59 patients were injured during contact sports, 30 in downhill skiing and 11 in other recreational activities, traffic accidents or at work. An associated medial collateral, ligament tear was more common in skiing (22/30) than during contact sports (23/59), whereas a bicompartmental meniscal lesion was found more frequently in contact sports (9/59) than in skiing (0/30). Weightbearing was reported by 56/59 of the patients with contact sports injuries and by 8/30 of those with skiing injuries. Non-weightbearing in the injury situation led to the same rate of MCL tears (18/28) as those reporting weightbearing (35/72) but significantly more intact menisci (19/28 vs 23/72). Thus, contact sports injuries were more often sustained during weightbearing, with a resultant joint compression of both femuro-tibial compartments as shown by the higher incidence of bicompartmental meniscal lesions. This might be an important prognostic factor for future joint disease and arthrosis. The classic unhappy triad was a rare finding (8/100) and we suggest that this entity should be replaced by the unhappy compression injury. 相似文献
67.
68.
从中医理论探索方药的作用机理 总被引:2,自引:0,他引:2
杨进 《南京中医药大学学报》1999,(5)
主要以所承担过的科研课题的研究思路及研究结果为依据,论述从传统中医理论探索方药作用机理的重要性。文中从养阴生津方药治疗热瘀证的作用、血分证中运用活血化瘀法的作用、辛开苦降法的作用及解表法的作用等方面论述从中医的特有理论出发,可以在探索方药作用机理时提供思路、开拓新的研究领域。同时,中医传统证治理论也要不断发展、提高,在运用传统证治理论研究方药作用机理时,不能完全被其所束缚,随着对证治理论认识的发展,对方药作用机理的认识也必然会出现一个飞跃。 相似文献
69.
对某化纤厂99名长期接触低浓度二硫化碳(CS2)作业工人和28名同厂非CS2作业工人的血脂进行流行病学横断面调查。结果发现:除接触组脂蛋白(a)[Lp(a)]浓度明显高于对照组外,其它血脂指标差别均无统计学意义;进一步通过多元逐步回归分析发现,长期低浓度CS2接触对Lp(a)的影响最大,二者呈正相关(r=0.43,P<0.01)。提示Lp(a)可能在CS2致脂质代谢障碍毒作用机制中起着重要作用。 相似文献
70.
A new type of energy converter for an electro-mechanical total artificial heart (TAH) based on the principle of a unidirectional moving motor is described. Named the TAH Serpentina, the concept consists of 2 major parts, a pendulum shaped movable element fixed on one side using a joint bearing and a special shaped drum cam. Pusher plates are mounted flexibly to the crossbar of the pendulum. A motor drives the special shaped drum cam linked to the pendulum through a ball bearing. The circular motion of the unidirectional moving brushless DC motor is transferred into the linear motion of the pendulum to drive the pusher plates. Using a crossbar with a variable length, the stroke of the pendulum and therefore the displaced blood volume is alterable. To achieve a variable length, an electric driven screw thread or a hydraulic system is possible. Comparable to the natural heart, cardiac output would be determined by frequency and stroke volume. 相似文献