全文获取类型
收费全文 | 16681篇 |
免费 | 1156篇 |
国内免费 | 566篇 |
专业分类
耳鼻咽喉 | 100篇 |
儿科学 | 106篇 |
妇产科学 | 59篇 |
基础医学 | 1309篇 |
口腔科学 | 4567篇 |
临床医学 | 1307篇 |
内科学 | 875篇 |
皮肤病学 | 114篇 |
神经病学 | 1560篇 |
特种医学 | 587篇 |
外国民族医学 | 2篇 |
外科学 | 2654篇 |
综合类 | 2265篇 |
现状与发展 | 1篇 |
预防医学 | 403篇 |
眼科学 | 53篇 |
药学 | 1084篇 |
16篇 | |
中国医学 | 1099篇 |
肿瘤学 | 242篇 |
出版年
2024年 | 45篇 |
2023年 | 294篇 |
2022年 | 556篇 |
2021年 | 699篇 |
2020年 | 618篇 |
2019年 | 527篇 |
2018年 | 477篇 |
2017年 | 563篇 |
2016年 | 606篇 |
2015年 | 590篇 |
2014年 | 1164篇 |
2013年 | 1144篇 |
2012年 | 1034篇 |
2011年 | 1127篇 |
2010年 | 852篇 |
2009年 | 725篇 |
2008年 | 767篇 |
2007年 | 786篇 |
2006年 | 696篇 |
2005年 | 610篇 |
2004年 | 507篇 |
2003年 | 466篇 |
2002年 | 409篇 |
2001年 | 351篇 |
2000年 | 291篇 |
1999年 | 255篇 |
1998年 | 264篇 |
1997年 | 223篇 |
1996年 | 192篇 |
1995年 | 163篇 |
1994年 | 149篇 |
1993年 | 153篇 |
1992年 | 130篇 |
1991年 | 107篇 |
1990年 | 104篇 |
1989年 | 99篇 |
1988年 | 87篇 |
1987年 | 63篇 |
1986年 | 91篇 |
1985年 | 100篇 |
1984年 | 68篇 |
1983年 | 49篇 |
1982年 | 51篇 |
1981年 | 42篇 |
1980年 | 40篇 |
1979年 | 21篇 |
1978年 | 14篇 |
1977年 | 13篇 |
1975年 | 7篇 |
1974年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
加压滑动鹅头钉治疗股骨转子间骨折的临床与实验研究 总被引:27,自引:0,他引:27
探讨加压滑动鹅头钉在治疗股骨转子间骨折中的作用。临床应用45例。男34例,女11例。平均年龄61岁。稳定型13例,不稳定型32例。经临床应用和生物力学实验测定,结果表明:(1)对不稳定型转子间骨折,恢复小转子区内后侧皮质骨的连续性在骨折的稳定中具有重要作用。(2)内后侧骨折块解剖复位,加压螺丝钉固定或大转子骨折端加压螺丝钉固定能显著增强加压滑动鹅头钉的固定作用,明显提高不稳定型转子间骨折的术后稳定性。(3)该装置设计合理,性能坚固,对转子间骨折具有很强的固定作用,能有效地达到早期下床和避免长期卧床的目的,是目前临床最理想的内固定装置。 相似文献
52.
53.
Polylactic acid (PLA) root replica in ridge maintenance after loss of a vertically fractured incisor
Abstract A periodontally affected tooth was prepared for a special treatment: Calcium hydroxide was introduced into the apical half of the root canal whereas its cervical part was filled with glass ionomer cement. The tooth was shortened subgingivally. After 6 weeks of epithelization over the residual root a palatal full-thickness flap was mobilized. The root was carefully extracted and chairside copy-milled from the biodegradable polylactic acid (PLA) material. The PLA-replica was implanted immediately into the socket and the flap was sutured. Aim of the treatment was to prevent the ridge collapse of the extraction area. Ridge height could be preserved during the 21 months of observation. With time the radiographic density of the cancellous bone increased in the implanted area, indicating that a PLA-replica is replaced by host's bone tissue. 相似文献
54.
Claude Clément MD Roberto Ruiz MD Bogdan Costa-Foru MD Hubert Nicaise MD 《Annals of vascular surgery》1990,4(3):305-308
Extrinsic compression of the renal artery due to a fibromuscular band originating from the diaphragm was encountered in a 26-year-old patient who had systemic hypertension associated with stenosis and kinking of one of her renal arteries. After surgical decompression, the renal artery assumed a normal expansion with disappearance of hypertension. Six other cases of extrinsic compression of the renal artery have been found in the literature. Surgical treatment is mandatory in all cases because the mechanism that causes the lesion makes percutaneous transluminal angioplasty illusory. 相似文献
55.
龈下残根修复前正畸治疗五例 总被引:7,自引:0,他引:7
目的 对损坏至龈缘下 1 5~ 3 5mm的前牙牙根在修复前行正畸牵引 ,当损坏平齐龈缘时再桩冠修复的方法进行探讨。方法 3例外伤、2例根面龋的患者 ,共 6个牙根接受完善根管治疗 ,修复前正畸暴露损坏 ,电刀修整牙龈 ,然后桩冠修复。结果 5例患者在修复后均取得了较满意的效果。结论 若前牙牙根损坏位于龈下釉牙骨质交界处 ,在修复前进行正畸治疗 ,既可保留残根 ,又可制作出有较好功能和美观效果的修复体 相似文献
56.
Summary Plain radiography, myelography and post-myelographic CT-scan are described and related to clinical findings in a prospective
study of 153 consecutive patients with myelographic signs of spinal cord compression. The majority of the metastatic tumours
arise in the vertebral body or the pedicles. In 80% of the patients with total blockage to the contrast medium on myelography
the post-myelographic-CT showed passage of the contrast medium. Ambulatory function at time of diagnosis was correlated to
the degree and the localization of the epidural block. In 64 patients who underwent a second myelography, the post-treatment
findings of sensory function were correlated to radiological regression. 相似文献
57.
Martin Buehrer Klaas P Pruessmann Peter Boesiger Sebastian Kozerke 《Magnetic resonance in medicine》2007,57(6):1131-1139
Arrays with large numbers of independent coil elements are becoming increasingly available as they provide increased signal-to-noise ratios (SNRs) and improved parallel imaging performance. Processing of data from a large set of independent receive channels is, however, associated with an increased memory and computational load in reconstruction. This work addresses this problem by introducing coil array compression. The method allows one to reduce the number of datasets from independent channels by combining all or partial sets in the time domain prior to image reconstruction. It is demonstrated that array compression can be very effective depending on the size of the region of interest (ROI). Based on 2D in vivo data obtained with a 32-element phased-array coil in the heart, it is shown that the number of channels can be compressed to as few as four with only 0.3% SNR loss in an ROI encompassing the heart. With twofold parallel imaging, only a 2% loss in SNR occurred using the same compression factor. 相似文献
58.
P. M. Parizel G. Rodesch D. Balériaux D. Zegers de Beyl J. D'Haens J. Noterman C. Segebarth 《Neuroradiology》1989,31(1):75-79
Summary The Gd-DTPA-enhanced magnetic resonance findings in two patients with herniated thoracic intervertebral discs are reported. The first patient was a 56-year-old woman with a small subligamentous T6-7 disc herniation, slightly lateralized to the right. The second patient was a 51-year-old man with a central and right posterolateral disc herniation, including a large calcified fragment, at the T8-9 level. The nonenhanced MR examination revealed the presence of an extradural mass lesion in both patients, impinging upon the dural sac and compressing and displacing the spinal cord posteriorly. The lesion was slightly hypointense on both T1- and T2-weighted spin echo sequences. Following intravenous injection of Gd-DTPA in a dosage of 0.1 mmol/kg body weight, enhancement of the posterior longitudinal ligament was noted and triangular areas of contrast uptake were seen to occur in the epidural space above and below the herniated disc. At surgery, they were found to correspond to dilated and congested epidural veins. 相似文献
59.
60.