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   1274篇
  免费   2篇
化学工业   3篇
金属工艺   2篇
机械仪表   2篇
轻工业   15篇
水利工程   1篇
无线电   1篇
一般工业技术   2篇
冶金工业   1245篇
自动化技术   5篇
  2021年   2篇
  2015年   1篇
  2014年   1篇
  2012年   2篇
  2011年   3篇
  2010年   4篇
  2009年   5篇
  2008年   1篇
  2006年   1篇
  2005年   1篇
  2004年   3篇
  2003年   3篇
  2002年   1篇
  2000年   1篇
  1999年   47篇
  1998年   395篇
  1997年   205篇
  1996年   152篇
  1995年   65篇
  1994年   49篇
  1993年   61篇
  1992年   11篇
  1991年   15篇
  1990年   10篇
  1989年   15篇
  1988年   15篇
  1987年   12篇
  1986年   8篇
  1985年   5篇
  1984年   1篇
  1983年   3篇
  1982年   5篇
  1981年   11篇
  1980年   7篇
  1978年   5篇
  1977年   35篇
  1976年   111篇
  1975年   2篇
  1955年   2篇
排序方式: 共有1276条查询结果,搜索用时 546 毫秒
91.
92.
93.
94.
95.
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   
96.
97.
Diurnal platyrrhines, both di- and trichromats, have magnocellular (M-) and parvocellular (P-) retinal ganglion cells which are morphologically very similar to those found in catarrhines. Catarrhine central P ganglion cells contact single midget bipolar cells, which contact single cones. Physiological recordings of retinal ganglion cells of dichromatic Cebus monkeys showed very similar cell properties to the catarrhine macaque, except that P ganglion cells lacked colour-opponency. We describe the presence of single-headed midget bipolar cells in the Cebus retina. These midget bipolar cells have axon terminal sizes in the same range as the dendritic tree sizes of P ganglion cells as far as 2 mm of retinal eccentricity. This result supports the view that, as in catarrhines, central P ganglion cells of platyrrhines receive input from single midget bipolar cells which in turn, receive input from single cones. This finding is consistent with the idea that a P pathway with one-to-one connectivity was present in the anthropoid ancestor before the divergence between catarrhines and platyrrhines.  相似文献   
98.
99.
The levels of antibodies (Ab) to bacterial antigens of gram-negative enterobacteria (Reglicolipid), Streptococcus agalactiae polysaccharide, Staphylococcus aureus teichoic acid, native and denatured DNA and renal proteins in healthy pregnant women and in those with renal pathology (chronic and gestation pyelonephritis) were studied. The study revealed that the combination of an elevated levels of Ab to bacterial antigens with the elevated titers of Ab to DNA and renal proteins is indicative of acute inflammation in kidneys, and but the combination of an elevated levels of Ab bacterial antigens with the low level of Ab to DNA and renal proteins is indicative of healthy carrier state with respect to a given infective agent.  相似文献   
100.
Pneumocystis carinii carinii and rat lung phospholipids contained 3-6% 1-alkyl-2-acyl glycerols composed of the glyceryl ether species, 1-O-octadecyl glycerol (batyl alcohol), 1-O-octadec-9-enyl glycerol (selachyl alcohol), 1-O-hexadecyl glycerol (chimyl alcohol), and 1-O-hexadec-9-enyl glycerol. Of the major phospholipid classes, phosphatidylinositol (PI) and phosphatidylserine contained the highest percentage of alkyl acyl glycerols. Methylprednisolone treatment caused an increase in alkyl acyl PI of rat lung lipids from 12% to 45%. As the PI concentration in lung phospholipids increases in rats treated with methylprednisolone, the increase in alkyl acyl PI was substantial; the proportions of alkyl acyl phosphatidylethanolamine and alkyl acyl lyso phosphatidylcholine (PC) also increased. Pneumocystis phospholipids contained higher proportions of alkyl acyl PC than the phospholipids of the lungs from normal and immunosuppressed uninfected rats. The glyceryl ether compositions of P. carinii carinii PC and lyso PC were similar, which suggests that lyso PC in the organism is derived by phospholipase A2 action on PC. This was not the case for PC and lyso PC of the lung controls. Analysis of the free fatty alcohols, precursors of glyceryl ethers identified only saturated species in P. carinii carinii and rat lung controls. Thus, the introduction of a double bond in the alcohol moiety of glyceryl ethers occurs after formation of the ether linkage between fatty alcohol and the glyceryl backbone.  相似文献   
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