全文获取类型
收费全文 | 3103篇 |
免费 | 542篇 |
国内免费 | 468篇 |
专业分类
化学 | 2416篇 |
晶体学 | 46篇 |
力学 | 156篇 |
综合类 | 21篇 |
数学 | 367篇 |
物理学 | 1107篇 |
出版年
2024年 | 10篇 |
2023年 | 58篇 |
2022年 | 117篇 |
2021年 | 130篇 |
2020年 | 146篇 |
2019年 | 139篇 |
2018年 | 113篇 |
2017年 | 126篇 |
2016年 | 179篇 |
2015年 | 173篇 |
2014年 | 190篇 |
2013年 | 270篇 |
2012年 | 268篇 |
2011年 | 252篇 |
2010年 | 232篇 |
2009年 | 170篇 |
2008年 | 204篇 |
2007年 | 150篇 |
2006年 | 153篇 |
2005年 | 163篇 |
2004年 | 131篇 |
2003年 | 92篇 |
2002年 | 103篇 |
2001年 | 117篇 |
2000年 | 70篇 |
1999年 | 70篇 |
1998年 | 38篇 |
1997年 | 31篇 |
1996年 | 25篇 |
1995年 | 24篇 |
1994年 | 24篇 |
1993年 | 17篇 |
1992年 | 27篇 |
1991年 | 14篇 |
1990年 | 23篇 |
1989年 | 8篇 |
1988年 | 6篇 |
1987年 | 9篇 |
1986年 | 17篇 |
1985年 | 9篇 |
1984年 | 5篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1979年 | 2篇 |
排序方式: 共有4113条查询结果,搜索用时 0 毫秒
1.
Fang‐Chyou Chiu Sun‐Mou Lai Jong‐Wu Chen Pei‐Hsien Chu 《Journal of Polymer Science.Polymer Physics》2004,42(22):4139-4150
The melt mixing technique was used to prepare various polypropylene (PP)‐based (nano)composites. Two commercial organoclays (denoted 20A and 30B) served as the fillers for the PP matrix, and two different maleated (so‐called) compatibilizers (denoted PP‐MA and SMA) were employed as the third component. The results from X‐ray diffraction (XRD) and transmission electron microscope (TEM) experiments revealed that 190 °C was an adequate temperature for preparing the nanocomposites. Nanocomposites were achieved only if specific pairs of organoclay and compatibilizer were simultaneously incorporated in the PP matrix. For example, PP/20A(5 wt %)/PP‐MA(10 wt %) and PP/30B(5 wt %)/SMA(5 wt %) composites exhibited nanoscaled dispersion of 20A or 30B in the PP matrix. Differential scanning calorimetry (DSC) results indicated that the organoclays served as nucleation agents for the PP matrix. Generally, their nucleation effectiveness increased with the addition of compatibilizers. The thermal stability enhancement of PP after adding 20A was confirmed with thermogravimetric analysis (TGA). The enhancement became more evident as a suitable compatibilizer was further added. However, for the 30B‐included composites, thermal stability enhancement was not evident. The dynamic mechanical properties (i.e., storage modulus and loss modulus) of PP increased as the nanocomposites were formed; the properties increment corresponded to the organoclay dispersion status in the matrix. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 4139–4150, 2004 相似文献
2.
Let f be a smooth map between unit spheres of possibly different dimensions. We prove the global existence and convergence of the mean curvature flow of the graph of f under various conditions. A corollary is that any area‐decreasing map between unit spheres (of possibly different dimensions) is isotopic to a constant map. © 2004 Wiley Periodicals, Inc. 相似文献
3.
4.
5.
The main aim of this paper is to provide convergence analysis of Quasi-Wilson nonconforming finite element to Maxwell's equations under arbitrary quadrilateral meshes.The error estimates are derived,which are the same as those for conforming elements under conventional regular meshes. 相似文献
6.
7.
On the Rank of the Semigroup TE(X) 总被引:1,自引:0,他引:1
Pei Huisheng 《Semigroup Forum》2005,70(1):107-117
${\cal T}_X $ denotes the full transformation semigroup on a set $ X $. For a
nontrivial equivalence $E$ on $X$, let
\[
T_E (X) =\{ f\in {\cal T}_X : \forall \, (a,b)\in E,\, (af,bf)\in E \} .
\]
Then $T_E (X) $ is exactly the semigroup of continuous selfmaps of
the topological space $X$ for which the collection of all
$E$-classes is a basis. In this paper, we first discuss the rank
of the homeomorphism group $G$, and then consider the rank of $T_E
(X)$ for a special case that the set $X$ is finite and that each
class of the equivalence $E$ has the same cardinality. Finally,
the rank of the closed selfmap semigroup $\Gamma(X)$ of the space
$X$ is observed. We conclude that the rank of $G$ is no more than
4, the rank of $T_E (X)$ is no more than 6 and the rank of
$\Gamma(X)$ is no more than 5. 相似文献
8.
The problem on the set-theoretical solutions to the quantum Yang-Baxter equation was presented byDrinfel'd as a main unsolved problem in quantum group theory. The set-theoretical solutions are a natural extensionof the usual (linear) solutions. In this paper, we not only give a further study on some known set-theoretical solutions(the Venkov's solutions), but also find a new kind of set-theoretical solutions which have a geometric interpretation.Moreover, the new solutions lead to the metahomomorphisms in group theory. 相似文献
9.
Three novel zinc complexes [Zn(dbsf)(H2O)2] ( 1 ), [Zn(dbsf)(2,2′‐bpy)(H2O)]·(i‐C3H7OH) ( 2 ) and [Zn(dbsf)(DMF)] ( 3 ) (H2dbsf = 4,4′‐dicarboxybiphenyl sulfone, 2,2′‐bpy = 2,2′‐bipyridine, i‐C3H7OH = iso‐propanol, DMF = N,N‐dimethylformamide) were first obtained and characterized by single crystal X‐ray crystallography. Although the results show that all the complexes 1–3 have one‐dimensional chains formed via coordination bonds, unique three‐dimensional supramolecular structures are formed due to different coordination modes and configuration of the dbsf2? ligand, hydrogen bonds and π–π interactions. Iso‐propanol molecules are in open channels of 2 while larger empty channels are formed in 3 . As compared with emission band of the free H2dbsf ligand, emission peaks of the complexes 1–3 are red‐shifted, and they show blue emission, which originates from enlarging conjugation upon coordination. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
10.