全文获取类型
收费全文 | 502篇 |
免费 | 25篇 |
专业分类
化学 | 355篇 |
晶体学 | 1篇 |
力学 | 2篇 |
数学 | 53篇 |
物理学 | 116篇 |
出版年
2023年 | 3篇 |
2022年 | 8篇 |
2021年 | 8篇 |
2020年 | 16篇 |
2019年 | 9篇 |
2018年 | 6篇 |
2017年 | 7篇 |
2016年 | 13篇 |
2015年 | 19篇 |
2014年 | 16篇 |
2013年 | 34篇 |
2012年 | 41篇 |
2011年 | 53篇 |
2010年 | 33篇 |
2009年 | 30篇 |
2008年 | 38篇 |
2007年 | 33篇 |
2006年 | 34篇 |
2005年 | 22篇 |
2004年 | 11篇 |
2003年 | 11篇 |
2002年 | 14篇 |
2001年 | 9篇 |
2000年 | 3篇 |
1999年 | 5篇 |
1998年 | 6篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1977年 | 2篇 |
1975年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有527条查询结果,搜索用时 16 毫秒
51.
Highly ordered mixed V(2)O(5)-TiO(2) nanotubes can be formed by self-organizing anodization of Ti-V alloys with vanadium content of up to 18 at%. In the resulting oxide nanotube arrays, the vanadium is electrochemically switchable leading to a specific capacitance that can reach up to 220 F g(-1) and an energy density of 19.56 Wh kg(-1) with perfect reversibility and long-term stability. Thus these mixed oxide nanotubes may be considered as a promising candidate for supercapacitors. 相似文献
52.
53.
Elke Baum Patrik Dahlke Volker Kaiser Michel Molinier Roland E. Schmidt Jürgen Pebler Werner Massa Dietrich Babel 《无机化学与普通化学杂志》2006,632(14):2244-2250
54.
D. Schürmann A. Di Leva L. Gialanella D. Rogalla F. Strieder N. De Cesare A. D'Onofrio G. Imbriani R. Kunz C. Lubritto A. Ordine V. Roca C. Rolfs M. Romano F. Schümann F. Terrasi H. -P. Trautvetter 《The European Physical Journal A - Hadrons and Nuclei》2005,26(2):301-305
The total cross-section of 12C(α,γ)16O was measured for the first time by a direct and ungated detection of the 16O recoils. This measurement in inverse kinematics using the recoil mass separator ERNA in combination with a windowless He
gas target allowed to collect data with high precision in the energy range E = 1.9 to 4.9 MeV. The data represent new information for the determination of the astrophysical S(E) factor. 相似文献
55.
56.
We theoretically introduce a mesoscopic pendulum from a triple dot. The pendulum is fastened through a singly occupied dot (spin qubit). Two other strongly capacitively coupled islands form a double-dot charge qubit with one electron in excess oscillating between the two low-energy charge states (1,0) and (0,1). The triple dot is placed between two superconducting leads. Under realistic conditions, the main proximity effect stems from the injection of resonating singlet (valence) bonds on the triple dot. This gives rise to a Josephson current that is charge- and spin-dependent and, as a consequence, exhibits a distinct resonance as a function of the superconducting phase difference. 相似文献
57.
58.
S. Anders M.G. Blamire F.-Im. Buchholz D.-G. Crété R. Cristiano P. Febvre L. Fritzsch A. Herr E. Il’ichev J. Kohlmann J. Kunert H.-G. Meyer J. Niemeyer T. Ortlepp H. Rogalla T. Schurig M. Siegel R. Stolz E. Tarte H.J.M. ter Brake A.B. Zorin 《Physica C: Superconductivity and its Applications》2010,470(23-24):2079-2126
59.
We consider the totally asymmetric simple exclusion process (TASEP) with two-sided Bernoulli initial condition, i.e., with
left density ρ
− and right density ρ
+. We study the associated height function, whose discrete gradient is given by the particle occurrences. Macroscopically one
has a deterministic limit shape with a shock or a rarefaction fan depending on the values of ρ
±. We characterize the large time scaling limit of the multipoint fluctuations as a function of the densities ρ
± and of the different macroscopic regions. Moreover, using a slow decorrelation phenomena, the results are extended from fixed
time to the whole space-time, except along the some directions (the characteristic solutions of the related Burgers equation)
where the problem is still open. 相似文献
60.
We introduce non-associative Ore extensions, S = R[X; σ, δ], for any nonassociative unital ring R and any additive maps σ, δ: R → R satisfying σ(1) = 1 and δ(1) = 0. In the special case when δ is either left or right R δ -linear, where R δ = ker(δ), and R is δ-simple, i.e. {0} and R are the only δ-invariant ideals of R, we determine the ideal structure of the nonassociative differential polynomial ring D = R[X; id R , δ]. Namely, in that case, we show that all non-zero ideals of D are generated by monic polynomials in the center Z(D) of D. We also show that Z( D ) = R δ [p] for a monic p ∈ R δ [X], unique up to addition of elements from Z(R) δ . Thereby, we generalize classical results by Amitsur on differential polynomial rings defined by derivations on associative and simple rings. Furthermore, we use the ideal structure of D to show that D is simple if and only if R is δ-simple and Z(D) equals the field R δ ∩ Z(R). This provides us with a non-associative generalization of a result by Öinert, Richter and Silvestrov. This result is in turn used to show a non-associative version of a classical result by Jordan concerning simplicity of D in the cases when the characteristic of the field R δ ∩ Z(R) is either zero or a prime. We use our findings to show simplicity results for both non-associative versions of Weyl algebras and non-associative differential polynomial rings defined by monoid/group actions on compact Hausdorff spaces. 相似文献