全文获取类型
收费全文 | 112篇 |
免费 | 0篇 |
国内免费 | 3篇 |
专业分类
化学 | 48篇 |
晶体学 | 2篇 |
力学 | 14篇 |
数学 | 31篇 |
物理学 | 20篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2019年 | 4篇 |
2018年 | 2篇 |
2016年 | 3篇 |
2014年 | 6篇 |
2013年 | 12篇 |
2012年 | 6篇 |
2011年 | 3篇 |
2010年 | 7篇 |
2009年 | 7篇 |
2008年 | 4篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2005年 | 4篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 2篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1994年 | 1篇 |
1993年 | 6篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 2篇 |
1977年 | 1篇 |
1975年 | 4篇 |
1974年 | 2篇 |
1972年 | 1篇 |
1970年 | 2篇 |
1969年 | 2篇 |
1968年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有115条查询结果,搜索用时 15 毫秒
71.
72.
Nguen Ngok Zao 《Russian Physics Journal》1974,17(12):1746-1748
It is shown that the formalism for eliminating vacuum degeneracy can be used to reduce the Heisenberg-Ivanenko nonlinear spinor Lagrangian to a Weinberg-type model Lagrangian of the weak and electromagnetic interactions. 相似文献
73.
74.
The effect of a shock load on the interaction of circular cracks in an elastic half-space is studied. In the space of Fourier time transforms, the problem is reduced to a system of two-dimensional boundary integral equations in the form of the Helmholtz potential with unknown densities characterizing the discontinuities in the displacements of the opposite crack faces. Discrete analogs of those equations are constructed. As an example, two cracks are considered whose faces are under the action of shock tensile loads varying in time as the Heaviside function. The time dependences of the dynamic stress intensity factors are obtained. Their dependence on the relative position of the cracks in the half-space is analyzed. 相似文献
75.
Quoc Thanh Phung Van Khai Vu An Bang Ngac Huy Sinh Nguyen Nam Nhat Hoang 《Journal of magnetism and magnetic materials》2012
The magnetic and transport properties of the perovskites La0.67Ca0.33Mn1-xTMxO3 were found to be sufficiently changed with the substitution of Mn-sites by other 3d transition-metal cations (TM=Cu,Zn; x=0.15). The values of TC, TM−I, and TCMR were surveyed when Mn was replaced by Cu and Zn. The magnetic field induced resistivity and magnetic entropy change of these samples showed abrupt changes near TC (194.2 and 201.5 K for Cu and Zn-doped case respectively) and attained the highest values among the doped cases (up to 20% Cu). The maximum values (obtained at H=4 kOe) of magnetoresistance ratio (CMR) were 27.8%, and 24.5% and of magnetic entropy change (−ΔSM) were 3.9 and 3.2 J/kg K for Cu and Zn-doped, respectively. 相似文献
76.
In the paper, we introduce higher-order tangent epiderivatives for set-valued maps. Then, we study some basic properties of these concepts. Finally, we establish some results on duality in set-valued optimization. Several examples are given to illustrate the obtained results.
相似文献77.
78.
Carol L. Ladner Khai Tran Mary Le Raymond J. Turner Robert A. Edwards 《Photochemistry and photobiology》2014,90(5):1027-1033
Photoreaction of indole containing compounds with chloroform and other trichlorocompounds generates products with redshifted fluorescence. In proteins, this reaction can be used for the fluorescent detection of proteins. Little characterization of products generated through the photochemical reaction of indoles with halocompounds has been done, yet is fundamental for the development of other fluorophores, protein labeling agents, and bioactive indole derivatives. Here, we have characterized which isomers form in the photoreaction between tryptophan and chloroform using 1H‐NMR of tryptophan and methylated derivatives to reveal that the two major products that are formed result from modification at the 4‐ and 6‐carbon positions of the indole ring. Reaction at position 6 generates 6‐formyl tryptophan and the reaction at position 4 generates an imine because the formyl derivative that is initially formed reacts further with the tryptophan amine group. The spectroscopic properties and product molecular weights of photoproducts formed from photoreaction of tryptophan with other trihalo and monohalocompounds are also determined. The indole ring of tryptophan can be modified with various additions from halocompounds, including the addition of labels to the indole ring via methylene groups. This opens possibilities for generating novel tryptophan based fluorophores and protein labeling strategies using this photochemistry. 相似文献
79.
T. D. Nghiep N. T. Khai N. T. Cong D. T. N. Minh 《Journal of Radioanalytical and Nuclear Chemistry》2013,295(2):1039-1042
We report on an experimental test with 662 keV gamma photons scattered from a set of samples from 6C, 13Al, 26Fe, 29Cu, 47Ag, 82Pb and stainless steel for determination of probability of linear scattering, which can be used for characterization of a material. The results show that for the given target and scattering angle, the effect of target thickness in gamma photons scattering relates to single and multiple scattering and that the scattered events exponentially increase with an increase in target thickness and saturation at some values of thickness. The experimental results correlate with the typical function of energy transfer model. 相似文献
80.
M. Mazzocco C. Signorini M. Romoli A. De Francesco M. Di Pietro E. Vardaci K. Yoshida A. Yoshida R. Bonetti A. De Rosa T. Glodariu A. Guglielmetti G. Inglima M. La Commara B. Martin D. Pierroutsakou M. Sandoli F. Soramel L. Stroe R. Kanungo N. Khai T. Motobayashi T. Nomura T. Ishikawa H. Ishiyama S. Jeong H. Miyatake M. H. Tanaka I. Sugai Y. Watanabe 《The European Physical Journal A - Hadrons and Nuclei》2006,28(3):295-299
The scattering of the radioactive, weakly bound, halo nucleus 11Be from 209Bi has been studied at 40MeV beam energy. The measurement performed with a low-intensity and a large-emittance secondary beam
could be made using an extremely compact, large solid angle (∼ 2π sr) detecting set-up, based on 8 highly segmented Si telescopes.
The 11, 9Be scattering angular distributions, as well as their relative reaction cross-sections, resulted to be rather similar. This
may suggest that at Coulomb barrier energies the halo structure and the very small binding energy of the 11Be projectile have no big influence on the reaction dynamics. 相似文献