全文获取类型
收费全文 | 1849篇 |
免费 | 74篇 |
国内免费 | 5篇 |
专业分类
化学 | 1443篇 |
晶体学 | 5篇 |
力学 | 19篇 |
数学 | 196篇 |
物理学 | 265篇 |
出版年
2023年 | 12篇 |
2022年 | 8篇 |
2021年 | 21篇 |
2020年 | 37篇 |
2019年 | 29篇 |
2018年 | 13篇 |
2017年 | 9篇 |
2016年 | 69篇 |
2015年 | 50篇 |
2014年 | 66篇 |
2013年 | 90篇 |
2012年 | 129篇 |
2011年 | 122篇 |
2010年 | 72篇 |
2009年 | 59篇 |
2008年 | 115篇 |
2007年 | 87篇 |
2006年 | 115篇 |
2005年 | 88篇 |
2004年 | 98篇 |
2003年 | 75篇 |
2002年 | 62篇 |
2001年 | 37篇 |
2000年 | 25篇 |
1999年 | 19篇 |
1998年 | 18篇 |
1997年 | 16篇 |
1996年 | 32篇 |
1995年 | 26篇 |
1994年 | 28篇 |
1993年 | 9篇 |
1992年 | 12篇 |
1991年 | 10篇 |
1990年 | 17篇 |
1988年 | 9篇 |
1987年 | 10篇 |
1986年 | 8篇 |
1985年 | 8篇 |
1984年 | 7篇 |
1983年 | 10篇 |
1982年 | 8篇 |
1981年 | 13篇 |
1980年 | 13篇 |
1979年 | 13篇 |
1978年 | 11篇 |
1977年 | 14篇 |
1976年 | 16篇 |
1975年 | 7篇 |
1974年 | 15篇 |
1973年 | 10篇 |
排序方式: 共有1928条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Thorsten Brand Kyle Ratinac Jeffrey V. Castro Robert G. Gilbert 《Journal of polymer science. Part A, Polymer chemistry》2004,42(22):5706-5713
A method was developed for free‐radical polymerization in the confines of a hollow latex particle. Hollow particles were prepared via the dynamic swelling method from polystyrene seed and divinylbenzene and had hollows of 500–1000 nm. So that these hollow poly(divinylbenzene) particles could function as submicrometer reactors, the particles were filled with a monomer (N‐isopropylacrylamide) via the dispersion of the dried particles in the molten monomer. The monomer that was not contained in the hollows was removed by washing and gentle abrasion. Free‐radical polymerization was then initiated by γ radiolysis in the solid state. Transmission electron microscopy showed that poly(N‐isopropylacrylamide) formed in the hollow interior of the particles, which functioned as submicrometer reactors. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 5706–5713, 2004 相似文献
5.
Thorsten Hamann Erin Osborne Heather L. Youngs Julie Misson Laurent Nussaume Chris Somerville 《Cellulose (London, England)》2004,11(3-4):279-286
We have used Affymetrix gene chips to measure the expression of 10 CESA and 29 CSL genes of Arabidopsis in different developmental stages or organs. These measurements reveal that many of the genes exhibit different levels of expression in the various organs. While several CESA genes are highly expressed in all the tissues examined, very few CSL genes approach such high levels of expression. This suggests that the CSL genes either encode enzymes for the synthesis of minor components of cell walls or are expressed only in specific cell types. The expression data also highlights the potential importance of the CESA genes for primary and secondary cell wall formation during different developmental stages and in the different organs examined. 相似文献
6.
7.
8.
Rafał Bocian Thorsten Holm Andrzej Skowroński 《Central European Journal of Mathematics》2004,2(1):67-75
Auslander’s representation dimension measures how far a finite dimensional algebra is away from being of finite representation
type. In [1], M. Auslander proved that a finite dimensional algebra A is of finite representation type if and only if the representation dimension of A is at most 2. Recently, R. Rouquier proved that there are finite dimensional algebras of an arbitrarily large finite representation
dimension. One of the exciting open problems is to show that all finite dimensional algebras of tame representation type have
representation dimension at most 3. We prove that this is true for all domestic weakly symmetric algebras over algebraically
closed fields having simply connected Galois coverings. 相似文献
9.
We generalize a variational principle for the mean spherical approximation for a system of charged hard spheres in 3D to arbitrary
dimensions. We first construct a free energy variational trial function from the Debye-Hückel excess charging internal energy
at a finite concentration and an entropy obtained at the zero-concentration limit by thermodynamic integration. In three dimensions
the minimization of this expression with respect to the screening parameter leads to the mean spherical approximation, usually
obtained by solution of the Ornstein-Zernike equation. This procedure, which interpolates naturally between the zero concentration/coupling
limit and the high-concentration/ coupling limit, is extended to arbitrary dimensions. We conjecture that this result is also
equivalent to the MSA as originally defined, although a technical proof of this point is left for the future. The Onsager
limitT ΔS
MSA
/ΔE
MSA
→ 0 for infinite concentration/coupling is satisfied for all d ≠ 2, while ford=2 this limit is 1.
On leave from Department of Physics, University of Puerto Rico, Mayagüez Campus, Mayagüez, Puerto Rico, 00681. 相似文献
10.