全文获取类型
收费全文 | 88篇 |
免费 | 0篇 |
专业分类
化学 | 55篇 |
力学 | 1篇 |
数学 | 3篇 |
物理学 | 29篇 |
出版年
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 2篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 7篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 7篇 |
2012年 | 3篇 |
2011年 | 5篇 |
2010年 | 4篇 |
2009年 | 6篇 |
2008年 | 4篇 |
2007年 | 7篇 |
2006年 | 7篇 |
2005年 | 1篇 |
2004年 | 4篇 |
2003年 | 1篇 |
2000年 | 1篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1995年 | 3篇 |
1993年 | 3篇 |
1982年 | 1篇 |
排序方式: 共有88条查询结果,搜索用时 15 毫秒
51.
Joby E. Joy Eric Atamanik Rohini Mani Abanti Nag R.M. Tiwari V. Thangadurai J. Gopalakrishnan 《Solid State Sciences》2010,12(12):1970-1976
We describe the synthesis, structures and dielectric properties of new perovskite oxides of the formula, Ba3MIIITiMVO9, for MIII = Fe, Ga, Y, Lu and MV = Nb, Ta, Sb. While MV = Nb and Ta oxides adopt disordered/partially ordered 3C perovskite structures where MIII/Ti/MV metal-oxygen octahedra are corner-connected, the MV = Sb oxides show a distinct preference for the 6H structure, where SbV/TiIV metal-oxygen octahedra share a common face forming (Sb,Ti)O9 dimers that are corner-connected to the MIIIO6 octahedra. The preference of antimony oxides (SbV:4d10) for the 6H structure – which arises from a special SbV–O chemical bonding that tends to avoid linear Sb–O–Sb linkages unlike NbV/TaV:d0 atoms which prefer ~180° Nb/Ta–O–Nb/Ta linkages – is consistent with the crystal chemistry of MV–O oxides in general. The dielectric properties reveal a significant difference among MIII members. All the oxides with the 3C structure excepting those with MIII = Fe show a normal low loss dielectric behaviour with ε = 20–60 in the temperature range 50–400 °C; the MIII = Fe members with this structure (MV = Nb, Ta) display a relaxor-like ferroelectric behaviour with large ε values at frequencies ≤1 MHz (50–500 °C). 相似文献
52.
53.
54.
Computational studies of molecular hydrogen binding affinities: the role of dispersion forces, electrostatics, and orbital interactions 总被引:1,自引:0,他引:1
Intermolecular interactions between H2 and ligands, metals, and metal-ligand complexes determine the binding affinities of potential hydrogen storage materials (HSM), and thus their extent of potential for practical use. A brief survey of current activity on HSM is given. The key issue of binding strengths is examined from a basic perspective by surveying the distinct classes of interactions (dispersion, electrostatics, orbital interactions) in first a general way, and then in the context of calculated binding affinities for a range of model systems. 相似文献
55.
56.
57.
C. Saritha Dilip B. Satpute Rohini Badarayani Anil Kumar 《Journal of solution chemistry》2009,38(1):95-114
Suitable equations have been proposed to correlate thermodynamic properties, like mean ion activity coefficients, volumes
and compressibilities, of amino acids in electrolyte solutions. An amino acid–electrolyte–water interaction parameter is extracted
from the regression of the amino acid property values in aqueous electrolyte solution that is then transferred to an expression
to correlate the properties of the electrolyte in mixtures. The single interaction parameter can successfully correlate the
published data on mean ion activity coefficients, apparent molar volumes and compressibilities of amino acids as well as of
electrolytes in their aqueous mixtures. The equations are tested against the large number of experimental data sets available
in the literature. 相似文献
58.
William N. Thurmes Kundalika M. More Michael R. Meadows Matthew B. O'Neill Rohini T. Vohra Michael D. Wand 《Liquid crystals》2013,40(5):461-477
Liquid-crystalline compounds containing germanium atoms were synthesised and assessed for liquid-crystalline properties. These new compounds generally possess smectic C phases, and many also possess nematic, smectic A and higher order smectic phases. The germanium-containing liquid crystals were incorporated into smectic C mixtures. These mixtures tend to exhibit little change in smectic C*?layer thickness over temperature. This characteristic is associated with de Vries smectic A materials, but measurements show that, although they have high smectic C stability, the materials' smectic cone angles are small. Measurement of smectic cone angle versus temperature of an exemplar material and its analogues containing carbon and silicon in place of the germanium, all show small cone angles which fall smoothly and extrapolate to zero as the smectic C*?to smectic A transition is approached. These measurements largely explain the observed small layer changes and establish that the materials are not first-order de Vries materials. They must be located elsewhere along the de Vries-orthogonal continuum of smectic A phases. 相似文献
60.