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   1578篇
  免费   1篇
电工技术   2篇
综合类   1篇
化学工业   24篇
金属工艺   5篇
机械仪表   1篇
能源动力   1篇
轻工业   5篇
无线电   1篇
一般工业技术   8篇
冶金工业   1530篇
自动化技术   1篇
  2015年   1篇
  2013年   2篇
  2012年   2篇
  2010年   1篇
  2005年   2篇
  2004年   4篇
  2003年   2篇
  2002年   1篇
  1999年   25篇
  1998年   405篇
  1997年   254篇
  1996年   166篇
  1995年   95篇
  1994年   75篇
  1993年   100篇
  1992年   9篇
  1991年   13篇
  1990年   7篇
  1989年   7篇
  1988年   7篇
  1987年   10篇
  1986年   7篇
  1985年   7篇
  1983年   2篇
  1982年   14篇
  1981年   22篇
  1980年   28篇
  1979年   3篇
  1978年   4篇
  1977年   91篇
  1976年   183篇
  1975年   7篇
  1973年   1篇
  1971年   1篇
  1968年   1篇
  1961年   2篇
  1960年   2篇
  1956年   3篇
  1955年   5篇
  1954年   3篇
  1952年   1篇
  1951年   1篇
  1950年   1篇
  1948年   1篇
  1947年   1篇
排序方式: 共有1579条查询结果,搜索用时 6 毫秒
131.
While examination of 83 patients it was established that in the presence of complicated gastric and duodenal ulcer disease the secondary immune deficiency is developing, which deepens after the surgical intervention conduction. Tiotriazolin, promoting the immune system state and the blood biochemistry indexes normalization, the immune system state and the blood biochemistry indexes stimulation, hemopoiesis stimulation, the treatment results improvement, was applied for immunomodulation.  相似文献   
132.
133.
134.
Restriction fragment length polymorphism (RFLP) of the apolipoprotein B locus was investigated in the population of Tomsk. The frequencies of alleles and haplotypes of polymorphic restriction sites XbaI, MspI, and EcoRI were determined. The parameters of linkage disequilibrium and polymorphism information content (PIC) were estimated. Comparative data on various regions of the world are shown.  相似文献   
135.
136.
Surface-enhanced Raman scattering (SERS) spectroscopy was used to study the structure of carbohydrate chains in glycosylated forms of alpha 1-acid glycoprotein (AGP) and in pseudoglycoproteins obtained by transferring the carbohydrate chains of AGP to a polyacrylamide carrier. It was found that AGP-D glycoform and pseudoglycoproteins containing three or more glycans per molecule, which possess high immunomodulating activity, have a specific spatial organization of carbohydrate chains. This organization is maintained by the interaction of neighboring glycans with each other and does not depend on the nature of the carrier (whether it is polypeptide or polyacrylamide).  相似文献   
137.
We have measured the Fourier transform spectrum of natural OCS from 3700 to 4800 cm-1 with a near Doppler resolution and a line-position accuracy between 4 and 8 x 10(-5) cm-1. For the normal isotopic species, 37 vibrational transitions have been analyzed for both frequencies and intensities. We also report 15 bands of OC34S, eight bands of O13CS, nine bands of OC33S, and two bands of 18OCS. Important effective Herman-Wallis terms are explained on the basis of eigenvectors. A comparison of different line-pointing programs is also presented. Copyright 1998 Academic Press.  相似文献   
138.
Between October 1983 and December 1991, 14 patients (mean age 48.1 [range 38 to 68] years) presented with single, clear, cystic-appearing juxtafoveal lesions beneath the retina, with discrete borders measuring approximately 2 mm in diameter. All patients had vision of 6/7.5 or better, which did not deteriorate over a follow-up period of 3 to 91 (mean 18.1) months. Angiographically, the lesions showed relative homogeneous hyperfluorescence with very discrete margins, the angiographic appearance of serous retinal pigment epithelial detachment. We describe the clinical and angiographic appearance on presentation and in follow-up and discuss the probable relationship of these lesions to central serous choroidopathy.  相似文献   
139.
140.
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