全文获取类型
收费全文 | 10059篇 |
免费 | 1790篇 |
国内免费 | 1593篇 |
专业分类
化学 | 419篇 |
晶体学 | 19篇 |
力学 | 653篇 |
综合类 | 702篇 |
数学 | 8277篇 |
物理学 | 3372篇 |
出版年
2024年 | 70篇 |
2023年 | 180篇 |
2022年 | 191篇 |
2021年 | 199篇 |
2020年 | 169篇 |
2019年 | 209篇 |
2018年 | 121篇 |
2017年 | 244篇 |
2016年 | 278篇 |
2015年 | 296篇 |
2014年 | 669篇 |
2013年 | 415篇 |
2012年 | 540篇 |
2011年 | 631篇 |
2010年 | 711篇 |
2009年 | 727篇 |
2008年 | 769篇 |
2007年 | 665篇 |
2006年 | 605篇 |
2005年 | 628篇 |
2004年 | 530篇 |
2003年 | 568篇 |
2002年 | 402篇 |
2001年 | 462篇 |
2000年 | 423篇 |
1999年 | 388篇 |
1998年 | 351篇 |
1997年 | 269篇 |
1996年 | 262篇 |
1995年 | 274篇 |
1994年 | 266篇 |
1993年 | 198篇 |
1992年 | 158篇 |
1991年 | 162篇 |
1990年 | 164篇 |
1989年 | 131篇 |
1988年 | 31篇 |
1987年 | 22篇 |
1986年 | 12篇 |
1985年 | 16篇 |
1984年 | 12篇 |
1983年 | 5篇 |
1982年 | 8篇 |
1980年 | 7篇 |
1979年 | 1篇 |
1959年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 843 毫秒
151.
In this paper, the authors present airflow field characteristics of human upper airway and soft palate movement attitude during
breathing. On the basis of the data taken from the spiral computerized tomography images of a healthy person and a patient
with Obstructive Sleep Apnea-Hypopnea Syndrome (OSAHS), three-dimensional models of upper airway cavity and soft palate are
reconstructed by the method of surface rendering. Numerical simulation is performed for airflow in the upper airway and displacement
of soft palate by fluid-structure interaction analysis. The reconstructed three-dimensional models precisely preserve the
original configuration of upper airways and soft palate. The results of the pressure and velocity distributions in the airflow
field are quantitatively determined, and the displacement of soft palate is presented. Pressure gradients of airway are lower
for the healthy person and the airflow distribution is quite uniform in the case of free breathing. However, the OSAHS patient
remarkably escalates both the pressure and velocity in the upper airway, and causes higher displacement of the soft palate.
The present study is useful in revealing pathogenesis and quantitative mutual relationship between configuration and function
of the upper airway as well as in diagnosing diseases related to anatomical structure and function of the upper airway.
The project supported by the National Natural Science Foundation of China (10672036, 10472025 and 10421002), the Natural Science
Foundation of Liaoning Province (20032109).
English text was polished by Yunming Chen. 相似文献
152.
Wengu Chen Yixin Lai 《分析论及其应用》2006,22(2):195-200
Let μ be a Borel measure on Rd which may be non doubling. The only condition that μ must satisfy is μ(Q) ≤ col(Q)n for any cube Q () Rd with sides parallel to the coordinate axes and for some fixed n with 0 < n ≤ d. The purpose of this paper is to obtain a boundedness property of fractional integrals in Hardy spaces H1 (μ). 相似文献
153.
M. Y. Xia G. H. Zhang G. L. Dai C. H. Chan 《计算数学(英文版)》2007,25(3):374-384
This paper is concerned with stable solutions of time domain integral equation (TDIE) methods for transient scattering problems with 3D conducting objects. We use the quadratic B-spline function as temporal basis functions, which permits both the induced currents and induced charges to be properly approximated in terms of completeness. Because the B-spline function has the least support width among all polynomial basis functions of the same order, the resulting system matrices seem to be the sparsest. The TDIE formula-tions using induced electric polarizations as unknown function are adopted and justified. Numerical results demonstrate that the proposed approach is accurate and efficient, and no late-time instability is observed. 相似文献
154.
林寿 《数学年刊A辑(中文版)》2006,(5)
首先构造一T_2的亚紧空间使其不是任一仿紧T_2空间的开紧映象,否定了A.Arhangel'skiǐ1962年提出的一个问题;其次利用构造开紧映射的方法指出存在具有G_δ对角线的T_2的次亚紧空间使其不具有G_δ~*对角线,肯定地回答了1999年R.Hodel提出的一个猜测. 相似文献
155.
In this paper, we prove Lp-boundedness of hyperbolic singular integral operators for kernels satisfying weakened regularity conditions, where 1
相似文献
156.
以山区高空间分辨率的DEM数据为主要数据源,在提取纬度、坡度、坡向等相应的地形要素栅格数据的基础上,利用GIS技术对山区可照时间的空间分布进行了模拟,实现了山区可照时间空间分布规律的可视化表达,分析了山区可照时间的空间分布特征,对于山区的农业、林业和生态环境等方面的研究具有重要意义. 相似文献
157.
本文研究多复变数单位球上的Carleson测度,利用Bloch函数对有界及消没对数Carleson测度进行刻画,得到了在Bloch空间上类似于Hardy空间和Bergman空间上的Carleson定理.并推广的Cesáro算子在Bloch空间上有界和紧的等价条件. 相似文献
158.
在实自反Banach空间,用补偿方法研究单调和Fuzzy单调广义非线性变分不等式,得到了几个解的存在性定理.改进和推广了Browder,Pascali-Sburlan,Zhang等人的各种结果. 相似文献
159.
The generalized Morrey spaces are introduced under the hypothesis that Rn is endowed with the general parabolic metric , and the boundedness properties are established in generalized Morrey spaces for a class of singular integral operators, which include Calderon-Zygmund singular integrals and their commutators with BMO. 相似文献
160.
Gui Qiao XU Yong Sheng SUN Yong Ping LIU 《数学学报(英文版)》2006,22(6):1667-1678
In this paper, we consider the n-widths and average widths of Besov classes in the usual Sobolev spaces. The weak asymptotic results concerning the Kolmogorov n-widths, the linear n-widths, the Gel'fand n-widths, in the Sobolev spaces on T^d, and the infinite-dimensional widths and the average widths in the Sobolev spaces on Ra are obtained, respectively. 相似文献