全文获取类型
收费全文 | 101080篇 |
免费 | 5962篇 |
国内免费 | 4844篇 |
专业分类
化学 | 57889篇 |
晶体学 | 1357篇 |
力学 | 5683篇 |
综合类 | 360篇 |
数学 | 12172篇 |
物理学 | 34425篇 |
出版年
2023年 | 762篇 |
2022年 | 1758篇 |
2021年 | 2114篇 |
2020年 | 2375篇 |
2019年 | 2593篇 |
2018年 | 2954篇 |
2017年 | 2882篇 |
2016年 | 3582篇 |
2015年 | 2489篇 |
2014年 | 3577篇 |
2013年 | 5078篇 |
2012年 | 5200篇 |
2011年 | 5500篇 |
2010年 | 4340篇 |
2009年 | 4370篇 |
2008年 | 4590篇 |
2007年 | 4288篇 |
2006年 | 3907篇 |
2005年 | 3477篇 |
2004年 | 3156篇 |
2003年 | 2827篇 |
2002年 | 2973篇 |
2001年 | 2679篇 |
2000年 | 2074篇 |
1999年 | 1664篇 |
1998年 | 1558篇 |
1997年 | 1350篇 |
1996年 | 1316篇 |
1995年 | 1104篇 |
1994年 | 1180篇 |
1993年 | 1112篇 |
1992年 | 1084篇 |
1991年 | 1138篇 |
1990年 | 1136篇 |
1989年 | 1046篇 |
1988年 | 932篇 |
1987年 | 928篇 |
1986年 | 890篇 |
1985年 | 943篇 |
1984年 | 924篇 |
1983年 | 831篇 |
1982年 | 809篇 |
1979年 | 808篇 |
1978年 | 815篇 |
1977年 | 815篇 |
1976年 | 928篇 |
1975年 | 817篇 |
1974年 | 852篇 |
1973年 | 850篇 |
1972年 | 756篇 |
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
101.
A. Yu. Toporov 《Technical Physics》2002,47(9):1199-1201
Antidots of size 0.5 μm are prepared by patterning iron-nickel films with a focused ion beam. The magnetization distribution in antidot arrays is examined with Lorentz transmission electron microscopy. It is shown that one side of the array makes an angle of about 20° with the easy magnetic axis of the film. Magnetization reversal in the direction close to the easy magnetic axis starts with domain nucleation at the antidot edges that are perpendicular to the applied field and adjacent to the unpatterned region of the film, and propagates as the domain walls move. Magnetization reversal in the direction close to the hard magnetic axis starts with magnetization rotation outside the patterned region at the antidot edges and propagates as the domain walls execute a complicated motion. It is demonstrated that some areas between the edges of adjacent antidots can carry information bits. Results obtained are explained in terms of competition between the demagnetizing energy, energy of internal anisotropy, and misorientation effect. The feasibility of such structures as high-density storage elements is discussed. 相似文献
102.
A. R. Volkov B. V. Shul'gin T. I. Polupanova V. N. Lebedev A. A. Nagornyi V. L. Petrov Yu. F. Kargin 《Journal of Applied Spectroscopy》1991,54(6):585-590
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 54, No. 6, pp. 970–975, June, 1991. 相似文献
103.
E. V. Zakharov A. G. Davydov Yu. V. Pimenov G. M. Tikhonov 《Computational Mathematics and Modeling》1991,2(1):79-84
Translated from Chislennye Metody Resheniya Obratnykh Zadach Matematicheskoi Fiziki, pp. 119–127. 相似文献
104.
105.
Yu V Sharvin 《Pramana》1987,28(5):592-592
Investigation of the galvanomagnetic properties of disordered metals in weak magnetic fields [r(H)?l, wherer(H) is the electron trajectory radius andl, the electron free path], proved to be one of the effective experimental methods of studying disordered metals. The phase difference between the interfering electron waves is affected by the presence of magnetic flux in the sample. One of the observable effects is the oscillatory magnetoresistanceK(H) of multiconnected samples predicted by Altshuleret al (1981). The period ofK(H) oscillations for the hollow cylinders, networks or chains with orifices cross-sections areasS isΔH=φ 0/2S [whereφ 0=hc/e]. The amplitude and the phase of the oscillations depend on the spin orbit interaction, the intensity of superconductive fluctuation etc. It should be noted that in small “mesoscopic” single loops the oscillations with the periodΔH?φ 0/S were also observed recently (see also Altshuleret al 1987 included in this issue). 相似文献
106.
107.
108.
We demonstrate a method that permits to obtain generalized solutions for some quasilinear equations and systems of hyperbolic
type. The corresponding variational principle is constructed using the theory of equilibrium of a potential in an external
field.
Dedicated to the memory of B. M. Levitan
Supported by RFBR grants Nos. 05-01-00522 and NSh-1551.2003.1, by Program No. 1 of the Branch of Mathematics, Russian Academy
of Sciences, and by INTAS project No. 03-51-6637. 相似文献
109.
110.
V. Yu. Belashov 《Radiophysics and Quantum Electronics》2002,45(5):376-380
We consider generalizations of the earlier results, obtained for one-dimensional equations of the Kadomtsev–Petviashvili (KP) class, to two- and three-dimensional KP-class equations with an arbitrary nonlinearity index with allowance for the higher-order dispersion correction and terms describing dissipation and instability. The asymptotics of soliton and nonsoliton solutions are derived. Constructing phase portraits in the 8-dimensional space based on the results of a qualitative analysis of generalized Korteweg–de Vries (KdV) equations is discussed. 相似文献