全文获取类型
收费全文 | 4222篇 |
免费 | 118篇 |
国内免费 | 10篇 |
专业分类
化学 | 2283篇 |
晶体学 | 42篇 |
力学 | 127篇 |
数学 | 456篇 |
物理学 | 1442篇 |
出版年
2022年 | 63篇 |
2021年 | 68篇 |
2020年 | 76篇 |
2019年 | 79篇 |
2018年 | 86篇 |
2017年 | 59篇 |
2016年 | 109篇 |
2015年 | 80篇 |
2014年 | 104篇 |
2013年 | 254篇 |
2012年 | 225篇 |
2011年 | 263篇 |
2010年 | 161篇 |
2009年 | 150篇 |
2008年 | 211篇 |
2007年 | 206篇 |
2006年 | 218篇 |
2005年 | 183篇 |
2004年 | 127篇 |
2003年 | 115篇 |
2002年 | 101篇 |
2001年 | 75篇 |
2000年 | 75篇 |
1999年 | 53篇 |
1998年 | 42篇 |
1997年 | 40篇 |
1996年 | 50篇 |
1995年 | 49篇 |
1994年 | 43篇 |
1993年 | 57篇 |
1992年 | 45篇 |
1991年 | 34篇 |
1990年 | 49篇 |
1989年 | 40篇 |
1988年 | 40篇 |
1987年 | 39篇 |
1986年 | 29篇 |
1985年 | 45篇 |
1984年 | 38篇 |
1983年 | 40篇 |
1982年 | 36篇 |
1981年 | 37篇 |
1980年 | 41篇 |
1979年 | 33篇 |
1978年 | 38篇 |
1977年 | 33篇 |
1976年 | 37篇 |
1975年 | 31篇 |
1974年 | 35篇 |
1973年 | 37篇 |
排序方式: 共有4350条查询结果,搜索用时 0 毫秒
91.
B. Roy 《Acta Mathematica Hungarica》2010,127(3):291-300
Characterizations of some properties of generalized R
0 and R
1 topological spaces by using closure operator defined on a generalized topological space will be given. It is also shown that
many results done in this area in some previous papers can be considered as special cases of our results. 相似文献
92.
J. -E. Augustin G. Cosme F. Couchot B. Dudelzak F. Fulda B. Grelaud G. Grosdidier B. Jean-Marie S. Jullian D. Lalanne V. Lepeltier B. Louis F. Mané C. Paulot R. Riskalla Ph. Roy F. Rumpf G. Szklarz Z. Ajaltouni A. Falvard J. Jousset B. Michel J. C. Montret R. Baldini S. Calcaterra G. Capon D. Bisello G. Busetto S. Limentani M. Nigro L. Pescara M. Posocco P. Sartori L. Stanco DM Collaboration 《Zeitschrift fur Physik C Particles and Fields》1987,36(3):369-376
The radiative decayJ/ψ → γ π+ π? has been studied using the 8.6 millionJ/ψ produced in the DM2 experiment at the DCIe +e? storage rings at Orsay. The π+ π? mass spectrum shows a cleanf 2 (1270) signal, and the possible presence of two other states at thef 2 (1720) andf 4 (2030) masses. For thef 2 (1270), the branching ratio BR(J/ψ →γf)xBR(f→π+ π?) is measured to be (7.50±0.30±1.12)×10?4, and the spin analysis prefers theJ=2 assignment, with helicity parametersx=0.83±0.06 andy=0.01±0.06. The existence of higher mass states is discussed. 相似文献
93.
We consider the Lie-Backlund symmetries and conservation laws of a perturbed KdV equation and NLS equation. The arbitrary coefficients of the perturbing terms can be related to the condition of existence of nontrivial LB symmetry generator. When the perturbed KdV equation is subjected to Painlevé analysisa la Weiss, it is found that the resonance position changes compared to the unperturbed one. We prove the compatibility of the overdetermined set of equations obtained at the different stages of recursion relations, at least for one branch. All other branches are also indicated and difficulties associated them are discussed considering the perturbation parameter to be small. We determine the Lax pair for the aforesaid branch through the use of Schwarzian derivative. For the perturbed NLS equation we determine the conservation laws following the approach of Chen and Liu. From the recurrence of these conservation laws a Lax pair is constructed. But the Painlevé analysis does not produce a positive answer for the perturbed NLS equation. So here we have two contrasting examples of perturbed nonlinear equations: one passes the Painlevé test and its Lax pair can be found from the analysis itself, but the other equation does not meet the criterion of the Painlevé test, though its Lax pair is found in another way. 相似文献
94.
Maurice Roy 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1958,9(5-6):554-569
Zusammenfassung Der Verfasser behandelt die Wirbelstr?mung um Pfeilflügel. Diese Str?mung ist, bei etwas h?heren Anstellwinkeln, gekennzeichnet
durch die Ausbildung einer Singularit?t, die er ?Wickelfl?che? (nappe en cornet) nennt. Die Konfiguration am Rand dieser Wirbelfl?che
wird analysiert. Weiter wird das Bild einer konischen Str?mung für einen unendlichen Delta-Flügel untersucht; dabei wird genauer
auf den Sinn der Singularit?ten eingegangen, die zu den Wirbeln der ?Wickelfl?che? oder den von der Pseudo-Str?mung in einer
Querebene gebildeten Wülsten dieser Fl?che hinzugefügt werden, und die den Charakter von Quellen oder Senken haben.
Der Verfasser diskutiert die Bedeutung der Staupunkte, der Trenn- und Abl?sungs-Linien und legt dar, wie man die Ausbildung
der Wülste und weiter der ?Wickelfl?che? selbst als das Ergebnis des Zusammenfliessens der beiden Grenzschichten von Ober-
und Unterseite auffassen kann, wobei diese letztere zur Oberseite hinüberstr?mt.
Schliesslich wird die Bildung von Gegenwirbeln untersucht.
O. N. E. R. A. (Office national d'études et de recherches aéronautiques). 相似文献
95.
A.K Roy 《Journal of Functional Analysis》1976,22(1):8-31
If μ and λ are probability measures on a metrisable compact convex set with μ < λ in the Choquet sense, then the main object of this paper is the study of the extremal structure of the convex set of all dilations carrying μ to λ. The extremal dilations are characterized and the relationships between these dilations and the extremal measures they induce are investigated. Several examples of extremal dilations with special properties are given to illustrate their behavior. Also given is a systematic characterization of measures which are extreme in the convex set of all measures dominating μ in the Choquet ordering. 相似文献
96.
W. Krakow N. M. Rivera R. A. Roy R. S. Ruoff J. J. Cuomo 《Applied Physics A: Materials Science & Processing》1993,56(3):185-192
Thin films (25-2500 Å) of C60 molecules have been deposited on both (001) NaCl and mica substrates at varying temperatures by resistive evaporation. Both electron diffraction and high resolution microscopy have been used to assess the degree of crystallinity, the orientational ordering and the nature of the defects present in these face-centered-cubic films. For NaCl, optimum conditions yielded polycrystalline films with a tendency towards a 110 orientation, while for mica, extended single crystal films have been fabricated which exhibit a 111 direction normal to the film surface. 相似文献
97.
Atiya MS Chiang IH Frank JS Haggerty JS Ito MM Kycia TF Li KK Littenberg LS Sambamurti A Stevens A Strand RC Louis WC Akerib DS Marlow DR Meyers PD Selen MA Shoemaker FC Smith AJ Blackmore EW Bryman DA Felawka L Kitching P Konaka A Kuno Y Macdonald JA Numao T Padley P Poutissou JM Poutissou R Roy J Soluk R Turcot AS 《Physical review letters》1993,70(17):2521-2524
98.
The analysis in this paper looks at two important elements in modelling the market for timber in the United States. First, the issue of directional causality between price and quantity and its implications in a modelling effort is investigated. Second, the extent of the geographic market for timber is discussed and a method of detecting it is suggested. The method for detecting the extent of the geographical market is tractable and can be applied in a straightforward way. Both considerations are applied to the softwood lumber market in the United States. 相似文献
99.
Hydromagnetic turbulent shear flow of viscous, incompressible, electrically conducting fluid between two infinite uniformly porous moving parallel planes in the presence of axial and transverse magnetic field has been studied by the semi-empirical method. The expressions for the mean distributions for velocity and magnetic field for turbulent shear flow have been obtained for both the cases. As particular cases, the results have been obtained if the planes are fixed. The solutions obtained when the magnetic field is axial have been shown graphically for turbulent and laminar flows. 相似文献
100.
Sunanda Banerjee Rohini M Godbole Sreerup Raychaudhuri Ben Allanach Sunanda Banerjee Satyaki Bhattacharyya Debajyoti Choudhury Siba Prasad Das Anindya Datta Rohini M Godbole Monoranjan Guchait Sabine Kraml Gobinda Majumdar David Miller Margarete Mühlleitner Nobuchika Okada Maxim Perelstein Santosh K Rai Sreerup Raychaudhuri Saurabh D Rindani DP Roy K Sridhar Rishikesh Vaidya D Zeppenfeld 《Pramana》2006,67(4):617-637
This is summary of the activities of the working group on collider physics in the IXth Workshop on High Energy Physics Phenomenology
(WHEPP-9) held at the Institute of Physics, Bhubaneswar, India in January 2006. Some of the work subsequently done on these
problems by the subgroups formed during the workshop is included in this report. 相似文献