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   166篇
  免费   0篇
化学工业   1篇
机械仪表   1篇
轻工业   1篇
石油天然气   2篇
一般工业技术   1篇
冶金工业   159篇
自动化技术   1篇
  2012年   1篇
  2010年   1篇
  2005年   1篇
  2000年   2篇
  1999年   2篇
  1998年   52篇
  1997年   27篇
  1996年   24篇
  1995年   7篇
  1994年   7篇
  1993年   6篇
  1992年   2篇
  1991年   1篇
  1989年   1篇
  1988年   1篇
  1986年   1篇
  1981年   2篇
  1980年   1篇
  1977年   5篇
  1976年   21篇
  1975年   1篇
排序方式: 共有166条查询结果,搜索用时 8 毫秒
71.
OBJECTIVE: Esophageal adenocarcinoma is increasing in white men. We sought to identify trends in esophageal cancer in different patient groups in our region. METHODS: We reviewed the records of all patients with esophageal cancer seen at two hospitals in Columbia, SC between 1981 and 1995. Patients were divided into three cohorts (1981-1985, 1986-1990, and 1991-1995). Demographic data, histological type, tumor stage, grade, and survival were recorded. RESULTS: Histology was available in 371 of 386 patients (cohort 1, 113 patients; cohort 2, 144; and cohort 3, 114). Adenocarcinoma accounted for 24%, 27%, and 49% of esophageal cancer in white men in cohorts 1, 2, and 3, respectively (p = 0.03). Corresponding figures for African-Americans were 10%, 7%, and 3% (p = 0.22). Women comprised 8%, 14%, and 22% of patients with squamous carcinoma in the three cohorts (p = 0.03). Median survival for esophageal cancer was 6.0, 6.8, and 10.4 mo in cohorts 1, 2, and 3 (p = 0.0002). CONCLUSION: Adenocarcinoma is increasing in whites. Squamous carcinoma remains the predominant type in this region, seen mainly in African-Americans. Esophageal squamous carcinoma is increasing in women. The mean age at diagnosis of squamous carcinoma has decreased in whites. There is a trend toward improved survival in patients with esophageal cancer.  相似文献   
72.
Using intraoperative monitoring of the blood flow linear speed in a. cerebralis media while total a. carotis interna occlusion in 10 patients the authors have concluded, that the degree of blood flow compensation in a. cerebralis media depends not only on collateral compensation possibilities by the contralateral side and rate of it inclusion, but largely-on a. carotis externa possibility on the lesion side.  相似文献   
73.
Normally the rat gingival microcirculatory bed is represented by superficial capillaries, postcapillaries, arterioles, and venules of different diameters. The major changes characterizing microcirculation disorders in experimental periodontitis are edema, arteriolar constriction and dilatation, stasis, and thrombosis, which undergo variously directed shifts in different periods of pathological process.  相似文献   
74.
AutoCAD在工程图学教学中的应用探索   总被引:1,自引:0,他引:1  
介绍了AutoCAD软件的特点、功能及当前的教学现状,阐述了AutoCAD在工程图学课程教学中的应用,提供了丰富的素材,开阔了学生视野,激发了学习兴趣,提高了教学效果,同时也使学生初步掌握了AutoCAD软件的使用方法。  相似文献   
75.
76.
77.
In 10 patients with bronchial asthma (BA) treated conventionally (control group), 10 BA patients on absolute diet therapy (group 1) and 10 BA patients in absolute diet therapy combined with wheat herb juice (group 2) tolerance to 12 antibiotics of different classes and some immunity factors were determined using a complex of diagnostic methods. The latter implies: case history, humoral and cell immunity defense system tests and special tests (chemical erythrograms and leukocyte migration inhibition test in plane capillary tubes with tested drugs). The data obtained evidence for increased tolerance of the antibiotics in groups 1 and 2 as well as for changes in humoral defense system, especially in immunoglobulin E. The drug tolerance may be a therapeutic criterion of absolute diet therapy in bronchial asthma patients.  相似文献   
78.
79.
80.
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