全文获取类型
收费全文 | 113篇 |
免费 | 5篇 |
国内免费 | 16篇 |
专业分类
化学 | 35篇 |
力学 | 40篇 |
综合类 | 1篇 |
数学 | 41篇 |
物理学 | 17篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 9篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 3篇 |
2012年 | 6篇 |
2011年 | 7篇 |
2010年 | 5篇 |
2009年 | 9篇 |
2008年 | 9篇 |
2007年 | 5篇 |
2006年 | 8篇 |
2005年 | 2篇 |
2004年 | 7篇 |
2003年 | 3篇 |
2002年 | 7篇 |
2001年 | 6篇 |
2000年 | 2篇 |
1999年 | 7篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1990年 | 2篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有134条查询结果,搜索用时 15 毫秒
81.
82.
A polynomialp in a polynomial algebra over a field is called a test polynomial if any endomorphism of the polynomial algebra that fixesp is an automorphism. some classes of new test polynomials recognizing nonlinear automorphisms of polynomial algebras are given.
In the odd prime characteristic case, test polynomials recognizing non-semisimple automorphisms are also constructed.
Project supported by the National Natural Science Foundation of China (Grant No. 19631100) and University of Hong Kong RGC
Fundable Grant 344/024/0004. 相似文献
83.
Feng Keqin 《数学年刊B辑(英文版)》1986,7(3):259-266
E. Thomas and A. T. Vasques proved the following result: For any totally real cubic number field K and subgroup $\[\Gamma \]$ of modular type of $\[PS{L_2}({O_K})\]$, the ring of Hilbert
modular forms for $\[\Gamma \]$ over k s not Gorenstein ring. In thE present paper the author comes to the same conclusion for any totally real number field of odd degree 相似文献
84.
85.
循环码是一类特殊的线性码,由于循环码快速的编码和译码算法,它被广泛应用于消费电子,数据存储以及通信系统当中.在本文中,利用特征是偶数的有限域上的三项式构造出了两类二元循环码,我们不仅可以确定出这两类循环码最小距离的下界,而且这两类循环码在参数的选取上非常的灵活. 相似文献
86.
A multiscale model for analyzing the synergy of CS and WSS on the endothelium in straight arteries 总被引:3,自引:0,他引:3
A multiscale model was proposed to calculate the circumferential stress (CS) and wall shear stress (WSS) and analyze the effects
of global and local factors on the CS, WSS and their synergy on the arterial endothelium in large straight arteries. A parameter
pair [Zs,SPA] (defined as the ratio of CS amplitude to WSS amplitude and the phase angle between CS and WSS for different harmonic components,
respectively) was proposed to characterize the synergy of CS and WSS. The results demonstrated that the CS or WSS in the large
straight arteries is determined by the global factors, i.e. the preloads and the afterloads, and the local factors, i.e. the
local mechanical properties and the zero-stress states of arterial walls, whereas the Zs and SPA are primarily determined by the local factors and the afterloads. Because the arterial input impedance has been shown to
reflect the physiological and pathological states of whole downstream arterial beds, the stress amplitude ratio Zs and the stress phase difference SPA might be appropriate indices to reflect the influences of the states of whole downstream arterial beds on the local blood
flow-dependent phenomena such as angiogenesis, vascular remodeling and atherosgenesis.
The project supported by the National Natural Science Foundation of China (10132020 and 10472027). The English text was polished
by Yunming Chen. 相似文献
87.
非牛顿流体力学研究的若干进展 总被引:3,自引:0,他引:3
简要介绍微极性流体,应力偶流体,非整数阶Maxwell流体和智能流体的基本概念,通过简单的例子阐述它们与牛顿流体的本质差别,并介绍非牛顿流体在以上热点研究领域的若干进展. 相似文献
88.
89.
Preparation and characterization of a novel Si-incorporated ceramic film on pure titanium by plasma electrolytic oxidation 总被引:1,自引:0,他引:1
A Si-incorporated bioactive ceramic film was prepared on pure titanium by plasma electrolytic oxidation (PEO) in a new bath containing Ca2+, H2PO4− and SiO32−. The film was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscope (XPS). The apatite-induced ability of PEO film was evaluated by soaking in a simulated body fluid (SBF) for various periods. The results showed that Si-incorporated PEO film present a porous microstructure, the pore size is around 1–5 μm. The film mainly consists of anatase and rutile and a small amount of CaHPO4 and CaO, besides, bioactive compounds such as CaSiO3 and SiO2, also exist in the Si-incorporated PEO film. After immersion in SBF for 28 days, not only the surface layer but also the pores inside the Si-incorporated PEO film were completely filled by apatite crystals, whereas on the surface of a benchmark PEO film free of Si just present small piles of apatite crystals. Silicon incorporated into the PEO film provided more heterogeneous nucleation sites for apatite deposition and hence increased remarkably bioactivity of the PEO film. 相似文献
90.
用Maxwell模型作为非牛顿泥床本构,建立了一组新的Boussinesq型方程组,以描述波-泥相互作用下水波的传播. 基于该方程,解析给出了一维线性长波衰减率的表达式. 当泥层模型退化到牛顿流体时,该结果与前人文献的结果一致. 当无量纲松弛时间λ较大时,衰减率随泥深近似地出现周期性的极值现象,这些极值位置对应泥层中各阶模态的衰减率峰值. 相似文献