全文获取类型
收费全文 | 15612篇 |
免费 | 1130篇 |
国内免费 | 992篇 |
专业分类
耳鼻咽喉 | 26篇 |
儿科学 | 142篇 |
妇产科学 | 32篇 |
基础医学 | 1955篇 |
口腔科学 | 75篇 |
临床医学 | 1738篇 |
内科学 | 980篇 |
皮肤病学 | 39篇 |
神经病学 | 718篇 |
特种医学 | 717篇 |
外国民族医学 | 3篇 |
外科学 | 5540篇 |
综合类 | 2952篇 |
预防医学 | 413篇 |
眼科学 | 90篇 |
药学 | 768篇 |
15篇 | |
中国医学 | 930篇 |
肿瘤学 | 601篇 |
出版年
2024年 | 85篇 |
2023年 | 321篇 |
2022年 | 588篇 |
2021年 | 756篇 |
2020年 | 711篇 |
2019年 | 482篇 |
2018年 | 465篇 |
2017年 | 571篇 |
2016年 | 611篇 |
2015年 | 588篇 |
2014年 | 1229篇 |
2013年 | 1131篇 |
2012年 | 961篇 |
2011年 | 1037篇 |
2010年 | 843篇 |
2009年 | 812篇 |
2008年 | 693篇 |
2007年 | 775篇 |
2006年 | 717篇 |
2005年 | 695篇 |
2004年 | 560篇 |
2003年 | 514篇 |
2002年 | 388篇 |
2001年 | 338篇 |
2000年 | 288篇 |
1999年 | 227篇 |
1998年 | 181篇 |
1997年 | 189篇 |
1996年 | 145篇 |
1995年 | 113篇 |
1994年 | 107篇 |
1993年 | 88篇 |
1992年 | 76篇 |
1991年 | 52篇 |
1990年 | 39篇 |
1989年 | 56篇 |
1988年 | 43篇 |
1987年 | 35篇 |
1986年 | 25篇 |
1985年 | 40篇 |
1984年 | 25篇 |
1983年 | 9篇 |
1982年 | 33篇 |
1981年 | 22篇 |
1980年 | 15篇 |
1979年 | 17篇 |
1978年 | 15篇 |
1977年 | 12篇 |
1976年 | 4篇 |
1970年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Tommi Sukuvaara Erkki M. J. Koski Aki Mäkivirta Aarno Kari 《Journal of clinical monitoring and computing》1994,10(2):117-126
A knowledge-based alarm system for intensive care monitoring was designed, built, tested on-line, and evaluated. The system is a functional prototype of a highly specific patient monitor providing alarms on hypovolemia, hyperdynamic state, left ventricular failure and hypoventilation. These intelligent alarm functions aim to maintain the quality of patient monitoring even if nurses' attention is temporarily reduced or focused elsewhere. The alarm system has an electronic access to data available in a multichannel patient monitor and the patient data management system of the intensive care unit. Median filtering, trend estimation, and rule-based reasoning are applied when processing the measured variables and estimating the patient's state. 相似文献
52.
M. Kneissel P. Roschger W. Steiner D. Schamall G. Kalchhauser A. Boyde M. Teschler-Nicola 《Calcified tissue international》1997,61(2):95-100
There is abundant data on cancellous bone in the aging human spine, but little relating to the growing vertebral cancellous
bone in childhood and adolescence. The purpose of this study was to map vertebral cancellous bone in a growth and age series
of historic skeletal samples and to make comparisons with data published on recent material. Lumbar vertebral bodies were
collected from 65 skeletons (0–60 years) from a medieval Nubian population. Ethnohistoric information was collected to interpret
conditions that might have influenced bone structure and metabolism. The cancellous bone was studied three dimensionally,
using stereophotography and scanning electron microscopy and morphometrically by performing a semiautomatic structural analysis
on digitized backscattered electron images of polymethacrylate-embedded material. The cancellous bone structure in the children
consisted mainly of a densely packed, uniform network of small rodlike trabeculae. The greatest bone volume fraction with
small, more platelike trabeculae was observed during adolescence. In young adults, larger platelike trabeculae were present
in the central zone and smaller trabeculae in the superior and inferior zones, as described for modern skeletal material.
Structural changes associated with aging were observed much sooner than in modern man. By the estimated age of approximately
50–60 years, the predominant architectural elements were slender rarified rods in both sexes. The ethnohistorical data suggest
that this was essentially a black African population of physically active peasants, not likely to suffer Vitamin D insufficiency
or deficient calcium intake. Thus an earlier onset of the biological age changes in cancellous bone found in modern populations
was probably prevalent.
Received: 1 March 1996 / Accepted: 31 December 1996 相似文献
53.
报告手术治疗腰椎间盘突出症合并退行性腰椎管狭窄症104例。术后随访90例,随诊时6个月~6年。优良率86.5%,无腰椎不稳和腰椎滑脱等并发症。为获得优良效果,作者强调在处理椎间盘突出的同时必须彻底解除侧隐窝及神经根管,黄韧带肥厚对神经根的压迫,才能彻底根除症状 相似文献
54.
55.
Ping Zhao 《中国结合医学杂志》1995,1(3):197-200
AStudyonExtension-FlexionDynamicLumbarSpineRadiographsinPatientswithLumbarIntervertebralDiscHerniationAStudyonExtension-Flexi... 相似文献
56.
Anterior lumbar fusion using a hybrid interbody graft 总被引:3,自引:0,他引:3
Summary This is a radiographic report of 40 patients (20 men, 20 women) who underwent anterior lumbar interbody fusions (73 levels)
utilizing a “hybrid” interbody graft composed of femoral cortical allograft (FCA) bone and iliac crest cancellous autograft
bone. The average age at surgery was 38 years (range 17–64 years), and follow-up averaged 1.4 years (range 1.0–2.4 years).
Nineteen of the patients had undergone previous lumbar surgery. Thirty-two patients (63 levels) underwent anterior fusion
combined with some type of posterior fixation, and eight patients (10 levels) had no posterior fixation. Types of posterior
fixation included: for 20 patients (36 levels) Steffee variable screw placement fixation, for 10 patients (23 levels) translaminar
facet screws (TFS), for 1 patient (3 levels) Knodt rods and for 1 patient (1 level) facet screws. Based on the persistence
of lucent lines at the graft-host interface, three patients (one level each) were felt to have non-unions at their latest
follow-ups at 1.4, 1.5 and 2.0 years, respectively. Two of these patients had no posterior fixation, and the other had TFS
fixation. The overall fusion rate was 96% (70 of 73 levels). The fusion rate for all levels treated with posterior fixation
was 98% compared with 75% for those without fixation. Intervertebral disc heights (IVDH) were measured on all films and corrected
for magnification with computer assistance. On average, the IVDH was increased postoperatively but returned to preoperative
values at follow-up. IVDH loss was independent of the type of instrumentation used. No complications arose from the use of
the hybrid graft. Incorporation of the allograft portion of the graft is slow and was felt to be complete in only 7 of the
73 levels at follow-up. We conclude that the hybrid interbody graft technique is a safe and reliable method for performing
anterior lumbar interbody fusions and should be combined with some type of posterior fixation. Long-term follow-up will be
required to assess the behaviour of the allograft until incorporation is complete. 相似文献
57.
58.
59.
重建钛板枢椎椎弓根螺钉及颗粒状植骨枕颈融合术 总被引:6,自引:1,他引:5
目的 探讨重建钛板螺钉及颗粒状自体松质骨植骨在枕颈融合中的应用。方法 2002年4月~2005年1月,选择枕颈区不稳定患者19例,年龄31~67岁;病程3个月~2年。其中枕寰枢椎复合畸形8例,陈旧性寰枢椎骨折脱位8例,类风湿性关节炎所致寰椎前脱位2例,枢椎齿状突肿瘤1例。JOA脊髓功能评分平均9.8分。使用重建钛板和枢椎椎弓根螺钉固定枕颈部,同时枕骨与枢椎后弓间颗粒状自体松质骨植骨。结果 术中、术后无并发症发生,切口Ⅰ期愈合。19例均获随访6个月~2年8个月,平均16个月,均获得了骨性融合。无神经血管损伤,无断钉、断板及内固定松脱。JOA脊髓功能评分平均达14.4分。结论 重建钛板枢椎椎弓根螺钉固定可靠,置入方便,自体颗粒状松质骨具有较高的融合率,在枕颈融合中效果满意。 相似文献
60.
David Karasick M.D. Eric A. Huettl M.D. Jerome M. Cotler M.D. 《Skeletal radiology》1992,21(6):359-363
With the growing number of orthopedic reconstructive spinal procedures, the use of bone grafting has steadily increased in the past decade. An understanding of the biology of bone grafting is essential for both the clinician and radiologist. Despite the advent of computed tomography and magnetic resonance imaging, conventional polydirectional tomography remains an important tool in the evaluation of vertebral body autografts. Trispiral or hypocycloidal tomography plays a valuable role in the assessment of bone graft fusion and possible complications, especially in the presence of metallic fixation devices. We present our imaging experience derived from 375 patients with cervical, thoracic, or lumbar anterior spinal fusion. True graft complications occurred in 27 patients (7%) and consisted of fracture (4%), malpositioning (3%), and infection (<1%). 相似文献