全文获取类型
收费全文 | 1300篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 21篇 |
金属工艺 | 10篇 |
机械仪表 | 5篇 |
矿业工程 | 2篇 |
能源动力 | 2篇 |
轻工业 | 3篇 |
石油天然气 | 6篇 |
无线电 | 4篇 |
一般工业技术 | 33篇 |
冶金工业 | 1212篇 |
原子能技术 | 1篇 |
自动化技术 | 3篇 |
出版年
2021年 | 4篇 |
2017年 | 5篇 |
2016年 | 3篇 |
2015年 | 5篇 |
2013年 | 4篇 |
2011年 | 3篇 |
2010年 | 2篇 |
2009年 | 2篇 |
2008年 | 3篇 |
2006年 | 3篇 |
2005年 | 3篇 |
2004年 | 3篇 |
2003年 | 4篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 28篇 |
1998年 | 321篇 |
1997年 | 219篇 |
1996年 | 157篇 |
1995年 | 105篇 |
1994年 | 60篇 |
1993年 | 75篇 |
1992年 | 6篇 |
1991年 | 22篇 |
1990年 | 8篇 |
1989年 | 9篇 |
1988年 | 6篇 |
1987年 | 5篇 |
1986年 | 4篇 |
1985年 | 6篇 |
1983年 | 4篇 |
1982年 | 4篇 |
1981年 | 11篇 |
1980年 | 16篇 |
1979年 | 2篇 |
1978年 | 8篇 |
1977年 | 47篇 |
1976年 | 98篇 |
1975年 | 3篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 5篇 |
1968年 | 1篇 |
1967年 | 2篇 |
1966年 | 3篇 |
1962年 | 1篇 |
1960年 | 2篇 |
1959年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有1303条查询结果,搜索用时 0 毫秒
971.
972.
VM Bashina 《Canadian Metallurgical Quarterly》1977,77(10):1532-1536
By means of a follow-up study the author studied 28 patients who at the age of 3-6 years were diagnosed as suffering from early infantile autism. In 6 cases the mental state of patients was characterized by traits of dissociated oligophrenic-like defect with preserved autistic forms of contacts, residual disorders of the syndrome of Kanners early autism, simbiotical dependency from the parents. In 15 cases there was a personality distortion, with traits of autism, emotional poorness, motor insufficiency, indifferent negativistic forms of contacts, mental retardation of the pseudooligophrenic type. In 7 cases there was a formation of a psychopathic state of a schizoid type. 相似文献
973.
974.
975.
V. V. Babenko G. A. Voropaev L. F. Kozlov V. I. Korobov N. F. Yurchenko 《Journal of Engineering Physics and Thermophysics》1980,38(6):651-655
Results of measurements are presented pertaining to the coefficients of lateral, in space, correlations and the spectral density of longitudinal velocity fluctuations at a rigid plate and at an elastic plate.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 38, No. 6, pp. 1049–1055, June, 1980. 相似文献
976.
977.
Polyribosomal messenger RNA from HeLa cells contain 3'-OH-terminal polyadenylate sequences approximately 133 nucleotides in length (weight average). When analyzed at the ribonucleoprotein level of organization these poly(A)-rich sequences are found to contain tightly bound proteins. These proteins remain associated with the poly(A)-rich RNA during affinity chromatography of RNase A and T1-digested polyribosomes on poly(U)-Sepharose in 0.5 M NaCl, and co-elute from the column with the RNA at 50% formamide. Controls establish that the co-purification of the proteins with poly(A) on poly(U)-Sepharose requires the molecular integrity of the poly(A). Polyacrylamide gel electrophoresis resolves the poly(A)-specific proteins into two components of 74,000 and 62,000 molecular weight. The larger protein is the same size as that previously reported to be associated with poly(A)-rich sequences in HeLa heterogeneous nuclear RNA (Kish, V.M., and Pederson, T. (1975), J. Mol. Biol. 95, 227-238). It is concluded that both HeLa nuclear and polyribosomal poly(A) sequences have a protein (62,000 molecular weight) associated with poly(A) appears to be confined only to messenger RNA. 相似文献
978.
979.
980.