全文获取类型
收费全文 | 4661篇 |
免费 | 142篇 |
国内免费 | 12篇 |
专业分类
化学 | 2779篇 |
晶体学 | 87篇 |
力学 | 150篇 |
数学 | 331篇 |
物理学 | 1468篇 |
出版年
2023年 | 42篇 |
2022年 | 92篇 |
2021年 | 82篇 |
2020年 | 101篇 |
2019年 | 93篇 |
2018年 | 115篇 |
2017年 | 85篇 |
2016年 | 132篇 |
2015年 | 109篇 |
2014年 | 162篇 |
2013年 | 262篇 |
2012年 | 348篇 |
2011年 | 338篇 |
2010年 | 194篇 |
2009年 | 171篇 |
2008年 | 202篇 |
2007年 | 190篇 |
2006年 | 188篇 |
2005年 | 151篇 |
2004年 | 116篇 |
2003年 | 115篇 |
2002年 | 89篇 |
2001年 | 75篇 |
2000年 | 61篇 |
1999年 | 54篇 |
1998年 | 32篇 |
1997年 | 54篇 |
1996年 | 64篇 |
1995年 | 44篇 |
1994年 | 75篇 |
1993年 | 82篇 |
1992年 | 80篇 |
1991年 | 50篇 |
1990年 | 50篇 |
1989年 | 54篇 |
1988年 | 35篇 |
1987年 | 39篇 |
1986年 | 37篇 |
1985年 | 35篇 |
1984年 | 33篇 |
1983年 | 37篇 |
1982年 | 39篇 |
1981年 | 50篇 |
1980年 | 40篇 |
1979年 | 31篇 |
1978年 | 26篇 |
1977年 | 34篇 |
1975年 | 24篇 |
1974年 | 27篇 |
1973年 | 33篇 |
排序方式: 共有4815条查询结果,搜索用时 0 毫秒
31.
A. Mondal N. K. Singh P. Chinnamuthu J. C. Dhar T. D. Das P. K. Bose 《Applied Physics A: Materials Science & Processing》2013,110(2):479-485
Glancing angle deposition (GLAD) has been employed to fabricate the Si/Si–O nanowires (NWs). The perpendicular NW on silicon substrate shows the amorphous nature. The visible light emission from the NWs was observed from the Si/Si–O nanoparticles. High light absorption inside the Si/Si–O NW structure was recorded. 相似文献
32.
33.
We investigate the change in the calculated value of asymptotic normalization constant (ANC) by the hyperspherical harmonics
expansion method with the inclusion of three nucleon force (3BF) in addition to two nucleon force. We see that ANC does not
change very much with the inclusion of 3BF indicating that the 3BF does not alter the asymptotic behaviours of HHE wavefunction
significantly. 相似文献
34.
35.
36.
Amal K. Das 《Zeitschrift für Physik B Condensed Matter》1981,40(4):353-357
The Brownian motion of an ensemble of charged particles in a quantizing magnetic field is considered in a simple quasi-classical model. The model describes random jumps between the Landau levels—corresponding to the quantized motion perpendicular to the magnetic field, and markovian fluctuations in momentum space—corresponding to the classical motion parallel to the field. A random walk dynamics is adopted for the former while an Ornstein-Uhlenbeck process is considered for the latter. The resulting Fokker-Planck equations constitute a semi-quantum stochastic process. The equations are solved and several physical aspects of the underlying system are discussed. 相似文献
37.
A. Das 《Zeitschrift fur Physik C Particles and Fields》1988,41(3):505-512
A bilocal lattice meson field equation which is invariant underP 4×SO 2×SO 2×SO 2×SO 2, is investigated. A class of general solutions in terms of the Laguerre polynomials (products of 2-dimensional hydrogen atom wave-functions) is presented. The “atomic” wave-functions in “momentum”-space indicate that two particles (patrons) are in bound orconfined state and moving along elliptical orbits in “momentum”-space. Four Green's functions for the (bilocal lattice scalar) partialdifference equation are obtained. Theconvergence of one Green's function is rigorously proved and the convergence of others are conjectured. 相似文献
38.
The inner-shell structure of some heavy atoms is examined using a self-consistent relativistic local density method. Ar(K), Kr(K) and Xe (K,L
1,L
2 andL
3) binding energies and {ie863-1} (hyper-satellite) energies of Tl, Hg and Tm are calculated. The results are compared with
available experimental data.
A part of this work was presented byMPD at the Trieste International Symposium on “Core level excitations in atoms, molecules and solids,” 22–26 June 1981, Extended
Abstracts (ed.) E Tosatti, ICTP Report No. 89/81 p. 11. 相似文献
39.
40.
A systematic semiquantitative account of all aspects of the strong and electromagnetic interactions of all the newly discovered
hadronic states (theψ’s, theχ’s, etc.) is presented within the framework of the paracharge scheme. Extensions of ideas familiar from the SU3 classification scheme to SU4 are shown to provide an understanding of the new states seen in the decays ofψ (3.1) andψ′ (3.7), including their masses and gross decay characteristics. The decays ofψ (3.1) andψ′ (3.7) themselves are studied in some detail. Since these are of electromagnetic origin in the scheme, their electromagnetic
mixing with the resonance at 4.15 GeV (theP-state of the scheme) is important. Once this is taken into account, the resulting picture is in excellent agreement with
available data. 相似文献