全文获取类型
收费全文 | 64篇 |
免费 | 3篇 |
专业分类
化学 | 23篇 |
力学 | 1篇 |
综合类 | 2篇 |
数学 | 5篇 |
物理学 | 36篇 |
出版年
2022年 | 1篇 |
2020年 | 2篇 |
2015年 | 1篇 |
2012年 | 3篇 |
2011年 | 3篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2006年 | 3篇 |
2005年 | 1篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 4篇 |
1999年 | 1篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 7篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1983年 | 2篇 |
1976年 | 1篇 |
1971年 | 1篇 |
1929年 | 1篇 |
排序方式: 共有67条查询结果,搜索用时 93 毫秒
21.
22.
Douglas X. West Cinda S. Carlson Authrine C. Whyte Anthony E. Liberta 《Transition Metal Chemistry》1990,15(1):43-47
Summary Spectral and thermal information, as well as activity againstAspergillus niger, have been obtained for 2-acetylpyridine4
N-ethylthiosemicarbazone and its iron(III), cobalt(II,III), nickel(II) and copper(II) complexes. 相似文献
23.
24.
25.
Douglas X. West Authrine C. Whyte Fatimah D. Sharif Haileselassie Gebremedhin Anthony E. Liberta 《Transition Metal Chemistry》1993,18(2):238-242
Summary NiII and CuII complexes of 2-acetylpyridine 4
N-(2-methylpyridinyl)-, 4
N-(2-ethylpyridinyl)- and 4
N-methyl(2-ethylpyridinyl) thiosemicarbazones (HL4pam, HL4pae, and HL4Mpae, respectively) of general formula [M(HL)X2] have been isolated from boiling EtOH and characterized by physico-chemical and spectroscopic methods. The growth inhibition activities of the thiosemicarbazones and their complexes were measured against Aspergillus nicer and Paecilomyces variotii. 相似文献
26.
Let < SL
n
(
) be a subgroup of finite index, where n 5. Suppose acts continuously on a manifold M, where 1(M) =
n
, preserving a measure that is positive on open sets. Further assume that the induced action on H
1(M) is non-trivial. We show there exists a finite index subgroup < and a equivariant continuous map : M
n
that induces an isomorphism on fundamental group. We prove more general results providing continuous quotients in cases where 1(M) surjects onto a finitely generated torsion free nilpotent group. We also give some new examples of manifolds with actions. 相似文献
27.
28.
为支持在并行设计过程中设计特征模型到加工特征模型的逐步转换,提出了局部特征识别的方法.在并行设计中,设计特征模型和加工特征模型通过面名历史图共享零件的实体模型,设计特征的变动通过局部特征识别自动地转换为相应的加工特征.局部特征识别是由基于最小条件子图特征识别方法改进来的,它以零件的局部区域为识别对象,通过搜索匹配局部区域构成的边界模式,识别出该局部区域中所包含的加工特征.局部特征识别方法的特点是只对设计中发生变动的区域进行识别. 相似文献
29.
Whyte AM Roach B Henderson DK Tasker PA Matsushita MM Awaga K White FJ Richardson P Robertson N 《Inorganic chemistry》2011,50(24):12867-12876
Square planar complexes of the type Ni(L(1))(2), Ni(L(2))(2), Cu(L(1))(2), and Cu(L(2))(2), where L(1)H = 2-hydroxy-5-t-octylacetophenone oxime and L(2)H = 2-hydroxy-5-n-propylacetophenone oxime, have been prepared and characterized by single-crystal X-ray diffraction, cyclic voltammetry, UV/vis spectroscopy, field-effect-transistor measurements, density functional theory (DFT) and time-dependent DFT (TDDFT) calculations, and, in the case of the paramagnetic species, electron paramagnetic resonance (EPR) and magnetic susceptibility. Variation of alkyl groups on the ligand from t-octyl to n-propyl enabled electronic isolation of the complexes in the crystal structures of M(L(1))(2) contrasting with π-stacking interactions for M(L(2))(2) (M = Ni, Cu). This was evidenced by a one-dimensional antiferromagnetic chain for Cu(L(2))(2) but ideal paramagnetic behavior for Cu(L(1))(2) down to 1.8 K. Despite isostructural single crystal structures for M(L(2))(2), thin-film X-ray diffraction and scanning electron microscopy (SEM) revealed different morphologies depending on the metal and the deposition method (vapor or solution). The Cu complexes displayed limited electronic interaction between the central metal and the delocalized ligands, with more mixing in the case of Ni(II), as shown by electrochemistry and UV/vis spectroscopy. The complexes M(L(2))(2) showed poor charge transport in a field-effect transistor (FET) device despite the ability to form π-stacking structures, and this provides design insights for metal complexes to be used in conductive thin-film devices. 相似文献
30.