全文获取类型
收费全文 | 395篇 |
免费 | 2篇 |
专业分类
化学 | 300篇 |
晶体学 | 9篇 |
力学 | 4篇 |
数学 | 42篇 |
物理学 | 42篇 |
出版年
2021年 | 9篇 |
2020年 | 5篇 |
2019年 | 7篇 |
2018年 | 8篇 |
2017年 | 8篇 |
2016年 | 6篇 |
2014年 | 5篇 |
2013年 | 8篇 |
2012年 | 7篇 |
2011年 | 5篇 |
2010年 | 4篇 |
2009年 | 9篇 |
2008年 | 5篇 |
2007年 | 4篇 |
2006年 | 6篇 |
2003年 | 4篇 |
2002年 | 4篇 |
2001年 | 5篇 |
2000年 | 5篇 |
1999年 | 6篇 |
1998年 | 5篇 |
1997年 | 8篇 |
1996年 | 4篇 |
1995年 | 8篇 |
1994年 | 8篇 |
1992年 | 6篇 |
1991年 | 11篇 |
1990年 | 6篇 |
1989年 | 5篇 |
1988年 | 6篇 |
1987年 | 5篇 |
1986年 | 6篇 |
1984年 | 6篇 |
1982年 | 7篇 |
1981年 | 6篇 |
1980年 | 8篇 |
1979年 | 9篇 |
1978年 | 7篇 |
1977年 | 22篇 |
1976年 | 25篇 |
1975年 | 9篇 |
1974年 | 7篇 |
1973年 | 13篇 |
1972年 | 10篇 |
1971年 | 15篇 |
1970年 | 8篇 |
1969年 | 4篇 |
1968年 | 17篇 |
1967年 | 7篇 |
1966年 | 5篇 |
排序方式: 共有397条查询结果,搜索用时 15 毫秒
41.
E.A. Makeeva M.N. Rumyantseva A.M. Gaskov B.A. Ismailov V.A. Vasnev 《Procedia Chemistry》2009,1(1):172-175
New hybrid materials based on nanocrystalline tin dioxide and two types of surface-immobilized polymer organosilicon structures with hydrocarbon substitutes were synthesized for gas sensors application. The sensing responses of pure SnO2 and hybrid samples were determined in the presence of NO2 (ppb range), CO (ppm range) and different humidity (RH = 15 – 95 %). Also the influence of water presence on sensor signal towards NO2 and CO was analyzed. Strong influence of nature of hydrocarbon substitutes on sensor response value towards NO2 and H2O was discovered. 相似文献
42.
43.
Ismailov Sh. M. Arapov Yu. D. Kamenev V. G. 《Radiophysics and Quantum Electronics》2021,63(8):571-581
Radiophysics and Quantum Electronics - We describe experimental studies of the recording of the relief of a diffusely reflecting surface using a shear interferometer. The interferometer uses a... 相似文献
44.
V. A. Matyshak O. N. Sil’chenkova I. T. Ismailov V. F. Tret’yakov 《Kinetics and Catalysis》2010,51(3):428-437
It is demonstrated by in situ IR spectroscopy that, in methanol conversion on ZrO2 and 5% Cu/ZrO2 catalysts, methoxy groups are present on the catalyst surface, which result from O-H or C-O bond breaking in the methanol
molecule. Two types of formate complexes, localized on ZrO2 and CuO, are also observed. The formate complexes form via the oxidative conversion of the methoxy groups. There are two
types of linear methoxy groups. First-type linear methoxy groups condense with the formate complex located on CuO to yield
methyl formate and then CO and H2. Second-type methoxy groups appear as intermediate products in the formation of dimethyl ether. The main hydrogen formation
reactions are the recombination of hydrogen atoms (which result from the interconversion of surface complexes) on copper clusters
and the decomposition of methyl formate. The source of CO2 in the gas phase is the formate complex, and the source of CO is methyl formate. The effect of water vapor and oxygen the
surface reactions and product formation is discussed. 相似文献
45.
N. I. Baram Kh. L. Ziyaev A. I. Ismailov D. Ziyamov Yu. S. Mangutova 《Chemistry of Natural Compounds》2000,36(2):185-188
New azo derivatives of gossypol are described. Their physicochemical properties are reported. The presence of hydroxyazo- and quinonhydrazo-tautomers is proposed.A. S. Sadykov Institute of Bioorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, Tashkent, fax (99871) 162 70 71. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 145–148, March–April, 2000. 相似文献
46.
N. I. Baram Kh. L. Ziyaev B. Khodzhaniyazov A. I. Ismailov 《Chemistry of Natural Compounds》1999,35(1):29-32
The results are given of a study of the hydrolysis of alkyl- and heterylimines of gossypol at various pH values.A. S. Sadykov Institute of Bioorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, Tashkent, fax (371) 162 70 71. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 38–41, January–February, 1999. 相似文献
47.
M. A. Khodzhaeva Z. F. Ismailov E. S. Kondratenko A. S. Shashkov 《Chemistry of Natural Compounds》1982,18(1):20-24
By fractionating the total glucofructan from the bulbs ofAllium sativum L. a homogeneous glucofructan with a molecular weight of 2300 has been isolated. On the basis of its characteristics, a comparison of IR and13C NMR spectra, and the results of periodate and chromium trioxide oxidation and of methylation, it has been established that this glucofructan is a new type of compound of this class, containing both inulin (2 → 1) and levan (2 → 6) glycosidic bonds. 相似文献
48.
Gaseous flow measurements in an internal combustion engine assembly using molecular tagging velocimetry 总被引:1,自引:0,他引:1
A molecular tagging velocimetry (MTV) system was applied for mapping in-cylinder flows in an internal combustion engine. The images were captured inside an optical engine assembly that reproduces operation of a 2.2 L four stroke gasoline engine. A recently developed algorithm to process MTV images is based on a fast-normalized spatial correlation approach implemented using MATLAB software. The code allows accurate detection of the MTV grid nodes displacements. It processes simultaneously velocity vector and circulation fields for individual cycles, and ensemble averages of those over a few hundred sequential cycles to obtain mean and standard deviation values. Then probability density functions are reconstructed to quantify cycle-to-cycle variability of the in-cylinder flow. 相似文献
49.
50.