全文获取类型
收费全文 | 9232篇 |
免费 | 1399篇 |
国内免费 | 1360篇 |
专业分类
化学 | 3211篇 |
晶体学 | 34篇 |
力学 | 597篇 |
综合类 | 160篇 |
数学 | 3966篇 |
物理学 | 4023篇 |
出版年
2024年 | 8篇 |
2023年 | 132篇 |
2022年 | 145篇 |
2021年 | 215篇 |
2020年 | 335篇 |
2019年 | 295篇 |
2018年 | 278篇 |
2017年 | 286篇 |
2016年 | 310篇 |
2015年 | 263篇 |
2014年 | 430篇 |
2013年 | 847篇 |
2012年 | 512篇 |
2011年 | 556篇 |
2010年 | 467篇 |
2009年 | 595篇 |
2008年 | 640篇 |
2007年 | 660篇 |
2006年 | 654篇 |
2005年 | 565篇 |
2004年 | 489篇 |
2003年 | 453篇 |
2002年 | 418篇 |
2001年 | 306篇 |
2000年 | 304篇 |
1999年 | 264篇 |
1998年 | 238篇 |
1997年 | 207篇 |
1996年 | 154篇 |
1995年 | 143篇 |
1994年 | 123篇 |
1993年 | 95篇 |
1992年 | 93篇 |
1991年 | 70篇 |
1990年 | 58篇 |
1989年 | 40篇 |
1988年 | 43篇 |
1987年 | 39篇 |
1986年 | 44篇 |
1985年 | 43篇 |
1984年 | 18篇 |
1983年 | 18篇 |
1982年 | 32篇 |
1981年 | 24篇 |
1980年 | 17篇 |
1979年 | 12篇 |
1978年 | 16篇 |
1977年 | 11篇 |
1976年 | 8篇 |
1973年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
对晶体硅(c-Si)太阳能电池而言, 氧化铝(AlOx)是一种广泛使用的钝化材料, 因为它具有优异的沉积保形性和良好的钝化质量. 为了确保AlOx发挥其良好的钝化效果, 在沉积后退火并氢化处理是必不可少的. 通过在AlOx薄膜上沉积氢化氮化硅(SiNx:H)来实现氢化, 利用开尔文探针力显微镜研究了在不同热处理和氢化作用下, AlOx/SiNx:H双层薄膜功函数的变化, 并基于沉积薄膜所含氢与固定电荷展开了讨论. 发现钝化质量和功函数之间有相关性, 影响因素包括薄膜厚度、氢化与热处理顺序. 相似文献
2.
4.
Wave packet dynamics of nonlinear Gazeau–Klauder coherent states of a position-dependent mass system in a Coulomb-like potential 下载免费PDF全文
Faustin Blaise Migueu Mercel Vubangsi Martin Tchoffo and Lukong Cornelius Fai 《中国物理 B》2021,30(6):60309-060309
AD = 1 position-dependent mass approach to constructing nonlinear quantum states for a modified Coulomb potential is used to generate Gazeau–Klauder coherent states. It appears that their energy eigenvalues are scaled down by the quantum number and the nonlinearity coefficient. We study the basic properties of these states, which are found to be undefined on the whole complex plane, and some details of their revival structure are discussed. 相似文献
5.
Isochronicity and linearizability of two-dimensional polynomial Hamiltonian systems are revisited and new results are presented. We give a new computational procedure to obtain the necessary and sufficient conditions for the linearization of a polynomial system. Using computer algebra systems we provide necessary and sufficient conditions for linearizability of Hamiltonian systems with homogeneous non-linearities of degrees 5, 6 and 7. We also present some sufficient conditions for systems with nonhomogeneous nonlinearities of degrees two, three and five. 相似文献
6.
In the paper mentioned in the title, it is proved the boundedness of the Riesz potential operator of variable order α(x) from variable exponent Morrey space to variable exponent Campanato space, under certain assumptions on the variable exponents p(x) and λ(x) of the Morrey space. Assumptions on the exponents were different depending on whether takes or not the critical values 0 or 1. In this note, we improve those results by unifying all the cases and covering the whole range . We also provide a correction to some minor technicality in the proof of Theorem 2 in the aforementioned paper. 相似文献
8.
本文基于新的Kronecker型替换,给出两个由黑盒表示的稀疏多项式的新确定性插值算法.令f∈R[x1,……,xn]是一个稀疏黑盒多项式,其次数上界为D.当R是C或者是有限域时,相对于已有算法,新算法具有更好的计算复杂度或者关于D的复杂度更低.特别地,对于一般黑盒模型,D是复杂度中的主要因素,而在所有的确定性算法中,本文的第二个算法的复杂度关于D是最低的. 相似文献
9.
Jacek Koput 《Journal of computational chemistry》2019,40(21):1911-1918
Accurate structure and potential energy surface of germylene, GeH2, in its ground electronic state 1A1 were determined from ab initio calculations using the coupled-cluster approach in conjunction with the correlation-consistent basis sets up to sextuple-zeta quality. The Born-Oppenheimer equilibrium structural parameters for the 1A1 state are estimated to be re(GeH) = 1.5793 Å and ∠e(HGeH) = 91.19∘. The term value Te for the lowest excited electronic state ã3B1 of GeH2 is predicted to be 9140 cm–1. The vibration-rotation energy levels for the 1A1 state of the 74GeH2, 74GeD2, 72GeH2, and 70GeH2 isotopologues were determined using a variational approach and compared with the experimental data. The role of the core-electron correlation, higher-order valence-electron correlation, scalar relativistic, spin-orbit, and adiabatic effects for prediction of the structure and vibration-rotation dynamics of the GeH2 molecule is discussed. © 2019 Wiley Periodicals, Inc. 相似文献
10.
ABSTRACTThis study computes the potential energy curves of the X1Σ+, A1Π, B1Δ, C1Σ+, and D1Π states of AlO+ cation and the transition dipole moments between them. The orders of the rotationless radiative lifetimes are 10–100?μs for the A1Π state, 1–1000?ms for the B1Δ state, 10?ns for the first well and 100?ns for the second well of the C1Σ+ state, and 1?μs for the D1Π state. Emissions of the B1Δ–A1Π and D1Π–C1Σ+ systems are so weak that they are hardly measured via spectroscopy, the emissions of the C1Σ+–X1Σ+, C1Σ+–A1Π, and D1Π–X1Σ+ systems are so strong that they can be detected readily, and emissions of the A1Π–X1Σ+ and D1Π–A1Π systems can be observed through spectroscopy only by a significant effort. There is a strong great similarity between spontaneous emissions of the A1Π–X1Σ+ system of the AlO+ cation and the A2Π–X2Σ+ system of the AlO radical. The emissions of the A2Π–X2Σ+ system of the AlO radical have been measured in outer space Therefore, it is highly possible that the emissions of the A1Π–X1Σ+ system of the AlO+ cation can be detected in the astrophysical media. 相似文献