全文获取类型
收费全文 | 118篇 |
免费 | 0篇 |
专业分类
化学 | 59篇 |
晶体学 | 1篇 |
力学 | 3篇 |
数学 | 15篇 |
物理学 | 40篇 |
出版年
2022年 | 2篇 |
2021年 | 3篇 |
2016年 | 3篇 |
2015年 | 5篇 |
2014年 | 6篇 |
2013年 | 7篇 |
2012年 | 2篇 |
2011年 | 6篇 |
2010年 | 2篇 |
2008年 | 2篇 |
2006年 | 2篇 |
2005年 | 5篇 |
2004年 | 4篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1991年 | 5篇 |
1990年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1970年 | 1篇 |
1968年 | 1篇 |
1966年 | 1篇 |
1957年 | 1篇 |
1932年 | 1篇 |
1928年 | 1篇 |
1925年 | 1篇 |
1923年 | 1篇 |
1916年 | 1篇 |
1915年 | 2篇 |
1909年 | 1篇 |
1905年 | 1篇 |
排序方式: 共有118条查询结果,搜索用时 0 毫秒
21.
Sandra C. Zinner Wolfgang A. Herrmann Fritz E. Kühn 《Journal of organometallic chemistry》2008,693(8-9):1543-1546
New chiral and non-chiral rhodium(I)–NHC complexes were synthesized. The first attempt by deprotonation of an imidazolinium salt with KOtBu and reaction with [Rh(COD)Cl]2 leads to the corresponding rhodium(I) complex. Due to the basic conditions during the reaction a loss of chirality occurs. An alternative transmetallation reaction with a silver(I)–NHC complex yields the desired rhodium(I)–NHC complex under retention of chirality. Both Rh complexes were fully characterized by analytical methods. 相似文献
22.
Wolfgang Jeitschko Dieter H. Heumannskmper Ute Ch. Rodewald Marietta S. Schriewer‐Pttgen 《无机化学与普通化学杂志》2000,626(1):80-88
The crystal structure of the known compounds Ln5Re2O12 (Ln = Y, Gd, Dy–Lu) and the new isotypic terbium rhenate Tb5Re2O12 was determined from X‐ray data of a twinned crystal of Ho5Re2O12: B2/m, a = 1236.5(4) pm, b = 748.2(2) pm, c = 563.8(1) pm, γ = 107.73(3)°, Z = 2, R = 0.034 for 379 structure factors and 37 variable parameters. The rhenium atoms (oxidation number +4.5) have octahedral oxygen coordination. These ReO6 octahedra share edges, thus forming infinite strings with alternating short and long Re–Re distances: 243.6(2) and 320.1(2) pm. Of the three holmium positions two are surrounded by seven oxygen atoms and the third one has octahedral oxygen coordination. The crystal structure of Pr3ReO8 was refined from single‐crystal X‐ray data: P21/a, a = 1498.0(2) pm, b = 749.09(8) pm, c = 610.48(9) pm, γ = 110.39(1)°, R = 0.017 for 2082 F values and 110 variable parameters. It is isotypic with a structure first determined for Sm3ReO8. The new compounds Pr3Re2O10 and Pr4Re2O11 were prepared by reaction of elemental praseodymium with the metaperrhenate Pr(ReO4)3. They were characterized through their X‐ray powder diagrams. Pr3Re2O10 was found to be monoclinic: a = 778.47(9) pm, b = 773.62(9) pm, c = 706.10(8) pm, β = 114.77(1)°. It is isotypic with La3Os2O10 and La3Re2O10. Pr4Re2O11 crystallizes with Nd4Re2O11 type structure with the tetragonal lattice constants a = 1272.49(3) pm, c = 562.29(2) pm. The compounds Nd4Re2O11 and Sm4Re2O11 are confirmed. The magnetic properties of Ho5Re2O12, Tb5Re2O12, Pr3Re2O10, Pr4Re2O11, Nd4Re2O11, and Sm4Re2O11 were investigated with a Faraday balance. None of these compounds shows magnetic order above 200 K. 相似文献
23.
24.
25.
26.
Nikolaj Thomas Zinner 《Few-Body Systems》2014,55(8-10):599-604
The study of quantum mechanical few-body systems is a century old pursuit relevant to countless subfields of physics. While the two-body problem is generally considered to be well-understood theoretically and numerically, venturing to three or more bodies brings about complications but also a host of interesting phenomena. In recent years, the cooling and trapping of atoms and molecules has shown great promise to provide a highly controllable environment to study few-body physics. However, as is true for many systems where few-body effects play an important role the few-body states are not isolated from their many-body environment. An interesting question then becomes if or (more precisely) when we should consider few-body states as effectively isolated and when we have to take the coupling to the environment into account. Using some simple, yet non-trivial, examples I will try to suggest possible approaches to this line of research. 相似文献
27.
We investigate a system of two polarized molecules in a layered trap. The molecules reside in adjacent layers and interact purely via the dipole?Cdipole interaction. We determine the properties of the ground state of the system as a function of the dipole moment and polarization angle. A bound state is always present in the system and in the weak binding limit the bound state extends to a very large distance and shows universal behavior. 相似文献
28.
N. T. Zinner G. M. Bruun 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,65(1-2):133-139
A layered system of two-dimensional planes containing fermionic polar molecules can potentially realize a number of exotic quantum many-body states. Among the predictions, are density-wave instabilities driven by the anisotropic part of the dipole-dipole interaction in a single layer. However, in typical multilayer setups it is reasonable to expect that the onset and properties of a density-wave are modified by adjacent layers. Here we show that this is indeed the case. For multiple layers the critical strength for the density-wave instability decreases with the number of layers. The effect depends on density and is more pronounced in the low density regime. The lowest solution of the instability corresponds to the density waves in the different layers being in-phase, whereas higher solutions have one or several adjacent layers that are out of phase. The parameter regime needed to explore this instability is within reach of current experiments. 相似文献
29.
ELECTRONICALLY EXCITED SPECIES IN THE PEROXIDASE CATALYZED OXIDATION OF INDOLEACETIC ACID. EFFECT UPON DNA AND RNA 总被引:1,自引:0,他引:1
Carmen C. C. Vidigal Adelaide Faljoni-Alário Nelson Durán Klaus Zinner Yoshiaki Shimizu Giuseppe Cilento 《Photochemistry and photobiology》1979,30(1):195-198
Abstract— The electronically excited species generated in the peroxidase (oxidase) catalyzed oxidation of the plant hormone indole-3-acetic acid is an excited state of indole-3-carboxaldehyde.
The chemiexcited species is able to induce in DNA the same alterations as observed with light or with enzyme-generated triplet acetone. The chemiexcited species can also alter r-RNA. 相似文献
The chemiexcited species is able to induce in DNA the same alterations as observed with light or with enzyme-generated triplet acetone. The chemiexcited species can also alter r-RNA. 相似文献
30.