全文获取类型
收费全文 | 419篇 |
免费 | 10篇 |
国内免费 | 5篇 |
专业分类
化学 | 142篇 |
晶体学 | 4篇 |
力学 | 8篇 |
数学 | 96篇 |
物理学 | 184篇 |
出版年
2016年 | 3篇 |
2015年 | 9篇 |
2014年 | 5篇 |
2013年 | 16篇 |
2012年 | 17篇 |
2011年 | 23篇 |
2010年 | 20篇 |
2009年 | 5篇 |
2008年 | 39篇 |
2007年 | 33篇 |
2006年 | 19篇 |
2005年 | 27篇 |
2004年 | 7篇 |
2003年 | 7篇 |
2002年 | 12篇 |
2001年 | 9篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 8篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 7篇 |
1991年 | 8篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 8篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 6篇 |
1982年 | 9篇 |
1981年 | 8篇 |
1980年 | 6篇 |
1979年 | 11篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1975年 | 4篇 |
1974年 | 3篇 |
1973年 | 5篇 |
1972年 | 5篇 |
1970年 | 4篇 |
1965年 | 2篇 |
1962年 | 5篇 |
1956年 | 2篇 |
1920年 | 2篇 |
1914年 | 2篇 |
1912年 | 2篇 |
1901年 | 2篇 |
排序方式: 共有434条查询结果,搜索用时 15 毫秒
81.
S. Mittag D. Pabst L.B. Pikelner W. Pilz R. Tschammer A. Meister D. Seeliger K. Seidel 《Nuclear Physics A》1985,435(1):97-109
Transmission spectra were measured with the time-of-flight technique at the Dubna pulsed reactor for samples of metallic U, UO2, U3O8, and UO3 enriched in 235U, and were compared in the regions of nine low-energy resonances to observe chemically induced shifts. After elimination of contributions caused by different Doppler broadenings, the shifts are interpreted as changes of the mean-square charge radius for nuclei capturing neutrons. The 〈r2〉 of the compound-nucleus states show on average a weak diminution as compared with the ground-state value. 相似文献
82.
J. Haslinger P. Neittaanmki E. Meister 《Mathematical Methods in the Applied Sciences》1986,8(1):157-181
A problem for finding optimal shape for systems governed by the mixed unilateral boundary value problem of Dirichlet-Signorini-type is considered. Conditions for the solvability of the problem are stated when a variational inequality formulation and when a penalty method is used for solving the state problem in question. The asymptotic relation of design problems based on these two formulations is presented. The optimal shape design problem is discretized by means of finite element method. The convergence results for the approximation are proved. The discretized versions are then formulated as a non-linear programming problem. Results of practical computations of the problem in question are reported. 相似文献
83.
The plane transmission problem of the Helmholtz equation for quadrants is characterized by a one-dimensional singular integral equation, which refers to the Fourier transform of the normal derivative of the solution along the x-axis. It is derived by solving the transmission problem for the upper and the lower half-plane involving a Neumann condition at y = 0. This is done by a two-dimensional Laplace transform technique. The inverse Laplace transform with respect to the second cartesian coordinate and the restriction of this one to y = 0 then lead to the integral equation. Thereby the transmission conditions of the original problem at y = 0 have to be taken into account. The resulting integral equation is of generalized Wiener-Hopf-type. It is solved via the contraction theorem imposing restricting conditions on the wave numbers. 相似文献
84.
J. Woll G. Meister U. Barjenbruch A. Goldmann 《Applied Physics A: Materials Science & Processing》1995,60(2):173-178
We have studied the formation of the addedrow (2×1)O overlayer on Cu(110) using Second-Harmonic Generation (SHG). To characterize the electronic properties of the surface, simultaneous observations with LEED and angle-resolved photoemission were performed. We are able to interpret our results in terms of transitions between surface bands of Cu(110) and Cu(110)-(2×1)O, respectively.Paper presented at the 129th WE-Heraeus-Seminar on Surface Studies by Nonlinear Laser Spectroscopies, Kassel, Germany, May. 30 to June 1, 1994 相似文献
85.
After the intraperitoneal administration of high doses of 14C- and 3H-labelled retinoic acid ( 1 ) to rats three major urinary metabolites have been isolated in microgram amounts by use of column, thin-layer and high-pressure liquid chromatography. Their structures were elucidated by mass spectroscopy and Fourier transform 1H-NMR. spectroscopy as 2 (5-methyl-5-[2-(2,6,6-trimethyl-3-oxo-1-cyclohexen-1-yl)vinyl]-2-tetrahydrofuranone), 3 (5-[2-(6-hydroxymethyl-2,6-dimethyl-3-oxo-1-cyclohexen-1-yl)vinyl]-5-methyl-2-tetrahydrofuranone) and 4 (6-(6-hydroxymethyl-2,6-dimethyl-3-oxo-1-cyclohexen-1-yl)-4-methyl-4-hexenoic acid). In these metabolites the tetraene side chain of 1 is shortened and the cyclohexene ring oxidized. The radioactivity of 2 and 3 accounted for about 10% (0.9% of the dose) each, metabolite 4 for about 6% (0.5% of the dose) of the total urinary radioactivity. 相似文献
86.
Dr. G. Meister 《Mathematical Methods of Operations Research》1987,31(5):A189-A209
Summary In the sequel we will derive sufficient and necessary conditions for the existence of certain numeric representations of simple games. In § 2 the above mentioned representation is given by a so called, coalitionally ordered function, i.e. a numeric function representing the desirability of each coalition in the class of all coalitions. Simple games which possess a c.o.f are called coalitionally ordered games. Sufficient and necessary criteria are given for a simple game to be a c.o.g. Analogously weighted majority games are characterized in § 3. The criteria to be presented are linked by properties of the desirability relation of a simple game. The concept of a desirability relation was introduced by Peleg 1978.
Zusammenfassung Im folgenden werden wir hinreichende und notwendige Bedingungen zur Existenz von gewissen numerischen Darstellungen einfacher Spiele (simple games) herleiten. Diese oben genannte Darstellung wird in § 2 durch eine sogenannte coalitionally ordered function, gegeben, wobei wir darunter eine numerische Funktion verstehen, die die Desirability, jeder Koalition innerhalb der Klasse aller Koalitionen beschreibt. Einfache Spiele, die eine c.o.f besitzen, werden coalitionally ordered games genannt. Es werden hinreichende und notwendige Bedingungen dafür genannt, daß ein einfaches Spiel ein c.o.g ist. Analog werden gewichtete Abstimmungsspiele (weighted majority games) in § 3 charakterisiert. Die angegebenen Kriterien werden mit Eigenschaften der sogenannten desirability relation eines einfachen Spieles in Verbindung gebracht. Das Konzept einer desirability relation wurde von Peleg 1978 verwendet.相似文献
87.
88.
89.
90.
C. A. Mitchell J. Walker G. Warburton J. Lewkowitsch H. R. Procter H. G. Benett L. Ubbelohde Meister H. Wolff H. C. Sherman M. J. Falk H. Ingle A. S. Fokin H. R. Jensen K. Hazura F. Bedford W. Fahrion A. Eibner H. Muggenthaler D. Holde und J. Marcusson 《Fresenius' Journal of Analytical Chemistry》1913,52(7-8):506-513
Ohne Zusammenfassung 相似文献