全文获取类型
收费全文 | 116篇 |
免费 | 2篇 |
专业分类
化学 | 60篇 |
晶体学 | 3篇 |
力学 | 1篇 |
数学 | 5篇 |
物理学 | 49篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2016年 | 2篇 |
2014年 | 5篇 |
2013年 | 4篇 |
2012年 | 3篇 |
2011年 | 3篇 |
2010年 | 1篇 |
2009年 | 4篇 |
2008年 | 3篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2004年 | 4篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 5篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 5篇 |
1995年 | 3篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 5篇 |
1978年 | 3篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1974年 | 5篇 |
1973年 | 2篇 |
1972年 | 5篇 |
1971年 | 5篇 |
1970年 | 1篇 |
1930年 | 3篇 |
排序方式: 共有118条查询结果,搜索用时 125 毫秒
101.
Naresh B. Kotadiya Anjana J. Kothari Devendra Tiwari Tapas K. Chaudhuri 《Applied Physics A: Materials Science & Processing》2012,108(4):819-824
A chemical bath deposition method of preparing photoconducting nanocrystalline lead sulphide (PbS) thin films at room temperature (RT) is described. The aqueous bath of lead acetate, thiourea, and ammonium hydroxide produce films of about 100?nm thicknesses in 45?minutes. X-ray diffraction (XRD) studies show that these films are nanocrystalline cubic PbS with 10?nm crystallite size. Atomic Force Microscope (AFM) and Scanning Electron Microscope (SEM) revealed that the films consist of spherical grains of sizes 100 to 200?nm. The transmission spectra of the films show onset of absorption edge around 850?nm and the bandgap is around 1.65?eV. The films are p-type with dark conductivity of 2.5×10?3?S/cm and mobility of 0.07?cm2/V?s. The photosensitivity is 6–7 for an illumination of 80?mW/cm2 from a halogen lamp (50?W, 12?V). Transient photoconductivity measurements reveal short and long life times of minority carriers. Thermoelectric and photothermoelectric studies show that photoconductivity in these films is mainly due to photogenerated majority carriers. 相似文献
102.
103.
104.
105.
Er, condensing under Ar at room temperature after exposure to laser pulses, forms with particle sizes of approximately 1.25 × 10?8 to 5.0 × 10?8 m. When this process is carried out under hydrogen atmosphere the dihydride is formed. 相似文献
106.
Paresh J. Kothari Virgil I. Stenberg Shiva P. Singh Surendra S. Parmar Robert W. Zoellner 《Journal of heterocyclic chemistry》1980,17(4):637-640
The natural abundance carbon-13 nuclear magnetic resonance spectra of various 5-aryltetrazoles, 1-(5-aryltetrazol-2-ylacetyl)-4-phenyl thiosemicarbazides and 5-(5-aryltetrazol-2-ylmethyl)-4-phenyl-s-triazole-3-thiols were recorded using Fourier transform techniques. The chemical shifts of various carbon resonances have been assigned on the basis of chemical shift theory, the signal multiplicity observed in the single-frequency off-resonance decoupled (SFORD) spectra and comparison with the chemical shifts of the model compounds. 相似文献
107.
Baljeet Kaur Satsangi Seema Kothari Kalyan K. Banerji 《Transition Metal Chemistry》1995,20(3):288-290
Summary The oxidation ofDL-methionine (MT) bybis(2,2-bipyridyl)copper(II) permanganate (BBCP) to the corresponding sulphoxide is first order in BBCP. Michaelis-Menten-type kinetics were observed with respect to MT. The formation constant of the intermediate complex and the rate constant for its decomposition were evaluated. The thermodynamic and activation parameters were also evaluated. The reaction is catalysed by H+ but 2,2-bipyridine does not affect the reaction rate. A mechanism is proposed. 相似文献
108.
109.
110.