全文获取类型
收费全文 | 60篇 |
免费 | 1篇 |
专业分类
化学 | 40篇 |
力学 | 1篇 |
数学 | 10篇 |
物理学 | 10篇 |
出版年
2023年 | 2篇 |
2015年 | 2篇 |
2013年 | 3篇 |
2012年 | 4篇 |
2011年 | 3篇 |
2010年 | 4篇 |
2009年 | 2篇 |
2008年 | 2篇 |
2007年 | 3篇 |
2006年 | 3篇 |
2005年 | 3篇 |
2004年 | 5篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1997年 | 1篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1912年 | 1篇 |
排序方式: 共有61条查询结果,搜索用时 15 毫秒
1.
The relationship between the CD spectra of the chiral biaryls and their stereochemical configuration, as a function of the dihedral angle between the molecular planes of the aromatic moieties, has been investigated for biphenyl, 1,1′-binaphthyl, 1,1′-bianthryl and 9,9′-bianthryl in the exciton approximation and, for the 1,1′-binaphthyls, in the π-SCF approximation. Both methods provide unambiguous assignments of absolute configuration except for biaryls with a critical dihedral angle of π/2 in those with effective Ddata2 chromophoric symmetry, or 100–110° in the case of the 1,1′-binaphthyls. 相似文献
2.
Kuiry SC Megen E Patil SD Deshpande SA Seal S 《The journal of physical chemistry. B》2005,109(9):3868-3872
This article reports an easy chemical method of synthesizing boehmite nanofibers by a modified sol-gel process involving aluminum isopropoxide precursor. Nanorods of gamma-alumina have been successfully prepared after dehydration of the viscous sol at 600 degrees C for 4 h in air. The boehmite nanofibers and gamma-alumina nanorods were characterized by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy for surface chemistry and functional groups, scanning electron microscopy, high-resolution transmission electron microscopy with selected area electron diffraction, and energy-dispersed spectroscopy for morphology and structure identification. The length of the boehmite nanofibers was found to be more than 10 mum with a crystalline lattice structure. The mechanism of formation of the boehmite nanofibers included the preferential growth along the longitudinal axis due to interaction between the solvent molecules and the surface OH- groups of hydrogen bonds. It is also suggested that the boehmite nanofibers may have formed due to the inherent instability of the planar structure of the boehmite lattice. The diameter of the gamma-alumina nanorods was found to be less than 10 nm with a varying length in the range of 50-200 nm. Boehmite to gamma-Al2O3 transformation was attributed to the loss of water molecules by internal condensation of protons and hydroxyl ions. 相似文献
3.
4.
5.
Ohne Zusammenfassung 相似文献
6.
7.
Karakoti AS Das S Thevuthasan S Seal S 《Angewandte Chemie (International ed. in English)》2011,50(9):1980-1994
Application of inorganic nanoparticles in diagnosis and therapy has become a critical component in the targeted treatment of diseases. The surface modification of inorganic oxides is important for providing diversity in size, shape, solubility, long-term stability, and attachment of selective functional groups. This Minireview describes the role of polyethylene glycol (PEG) in the surface modification of oxides and focuses on their biomedical applications. Such a PEGylation of surfaces provides "stealth" characteristics to nanomaterials otherwise identified as foreign materials by human body. The role of PEG as structure-directing agent in synthesis of oxides is also presented. 相似文献
8.
D.A. Genov K. Seal A.K. Sarychev H. Noh V.M. Shalaev Z.C. Ying X. Zhang H. Cao 《Applied physics. B, Lasers and optics》2006,84(1-2):205-210
Theoretical and experimental studies of the electromagnetic response of semicontinuous metal films are presented. A scaling
theory is developed by solving the surface plasmon eigenproblem. The short-range correlations in the governing Kirchhoff Hamiltonian
result in delocalization of the surface plasmon eigenmodes. Although their relative weight in the spectrum becomes asymptotically
small for large systems, the existence of these delocalized states modifies the critical indices for the high-order field
moments. This modification is confirmed experimentally by the near-field measurement of high-order intensity moments for percolating
silver films on glass substrates.
PACS 68.37.Uv; 73.20.Mf; 42.25.Dd; 78.67.-n 相似文献
9.
10.