全文获取类型
收费全文 | 21542篇 |
免费 | 139篇 |
国内免费 | 89篇 |
专业分类
化学 | 10878篇 |
晶体学 | 419篇 |
力学 | 624篇 |
综合类 | 7篇 |
数学 | 2051篇 |
物理学 | 7791篇 |
出版年
2016年 | 244篇 |
2015年 | 167篇 |
2014年 | 269篇 |
2013年 | 878篇 |
2012年 | 577篇 |
2011年 | 640篇 |
2010年 | 470篇 |
2009年 | 479篇 |
2008年 | 633篇 |
2007年 | 680篇 |
2006年 | 645篇 |
2005年 | 586篇 |
2004年 | 519篇 |
2003年 | 488篇 |
2002年 | 482篇 |
2001年 | 693篇 |
2000年 | 515篇 |
1999年 | 431篇 |
1998年 | 357篇 |
1997年 | 341篇 |
1996年 | 313篇 |
1995年 | 396篇 |
1994年 | 367篇 |
1993年 | 351篇 |
1992年 | 363篇 |
1991年 | 400篇 |
1990年 | 375篇 |
1989年 | 371篇 |
1988年 | 344篇 |
1987年 | 352篇 |
1986年 | 367篇 |
1985年 | 446篇 |
1984年 | 459篇 |
1983年 | 346篇 |
1982年 | 367篇 |
1981年 | 392篇 |
1980年 | 359篇 |
1979年 | 377篇 |
1978年 | 375篇 |
1977年 | 349篇 |
1976年 | 359篇 |
1975年 | 313篇 |
1974年 | 311篇 |
1973年 | 321篇 |
1972年 | 197篇 |
1971年 | 166篇 |
1969年 | 163篇 |
1968年 | 202篇 |
1967年 | 339篇 |
1966年 | 289篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
E. Gantner U. Kuhnes H. J. Ache 《Journal of Radioanalytical and Nuclear Chemistry》1992,161(2):561-574
The application, the advantage and limits of neutron monitoring techniques, such as Hf-monitors, fissile material accumulation and concentration monitors are being discussed. The active neutron counting technique applied to emptied pulsed extraction columns containing Hf-sieve plates allows conclusive answers as to the position of the plates in the columns. Pu-accumulations on Hf-sieve plates in pulsed extraction columns can be estimated within a factor of two, whereby the detection limit is about equal to or less than 1 g Pu/plate. Fissile material concentration changes of 1.1 g/l can be detected in the case of235U in solution and of 0.4 Pu/l if a239Pu/240Pu ratio of 4 to 1 is assumed. 相似文献
63.
64.
U. Goginava 《分析论及其应用》2007,23(3):255-265
In this paper we prove that iff ∈ C([-π,π]2) and the function f is bounded partial p-variation for some p ∈ [1, ∞), then the double trigonometric Fourier series of a function f is uniformly (C;-α,-β) summable (α β< 1/p,α,β> 0) in the sense of Pringsheim. If α β≥ 1/p, then there exists a continuous function f0 of bounded partial double trigonometric Fourier series of fo diverge over cubes. 相似文献
65.
This paper studies the problem of uniformly dissipative solutions of somefifth order non-linear differential equations by the use of frequency domaintechnique. We use the generalized theorem of Yacubovich on dissipativity toobtain some new sufficient conditions of the existence of solutions that aredissipative for (1.1) and (1.2). 相似文献
66.
A. K. Nasirov G. Giardina A. I. Muminov W. Scheid U. T. Yakhshiev 《Acta Physica Hungarica A》2004,19(1-2):109-120
The effect of entrance channel on decrease of the complete fusion cross sections and on the yield of reaction products are associated with the quasifission which depends on the mass asymmetry and shell structure of colliding nuclei. In reactions of massive projectile and target nuclei, the competition between complete fusion and quasifission appears at the stage of compound nucleus formation, in addition to the increase of the fission probability. It is shown that the yield of quasifission products may be symmetric or asymmetric in dependence on peculiarities of shell structure of reaction fragments. Marima of mass or charge distributions are connected with the peculiarities of shell structure of reaction fragments. 相似文献
67.
A novel liquid scintillator system using metal β-diketonate chemistry based on loadings of indium, a target of current interest in low energy solar neutrino detection, is developed. The optical absorption, fluorescence and scintillation properties for this new system are described. The scintillation light output as found from the irradiation by low energy gamma-rays is presented. Notable light yields are found. 相似文献
68.
69.
70.