全文获取类型
收费全文 | 894篇 |
免费 | 196篇 |
国内免费 | 83篇 |
专业分类
化学 | 230篇 |
晶体学 | 18篇 |
力学 | 71篇 |
综合类 | 17篇 |
数学 | 137篇 |
物理学 | 700篇 |
出版年
2024年 | 1篇 |
2023年 | 8篇 |
2022年 | 22篇 |
2021年 | 20篇 |
2020年 | 21篇 |
2019年 | 21篇 |
2018年 | 13篇 |
2017年 | 29篇 |
2016年 | 36篇 |
2015年 | 31篇 |
2014年 | 67篇 |
2013年 | 62篇 |
2012年 | 57篇 |
2011年 | 67篇 |
2010年 | 55篇 |
2009年 | 81篇 |
2008年 | 70篇 |
2007年 | 61篇 |
2006年 | 66篇 |
2005年 | 63篇 |
2004年 | 41篇 |
2003年 | 34篇 |
2002年 | 27篇 |
2001年 | 28篇 |
2000年 | 19篇 |
1999年 | 28篇 |
1998年 | 22篇 |
1997年 | 19篇 |
1996年 | 18篇 |
1995年 | 15篇 |
1994年 | 12篇 |
1993年 | 12篇 |
1992年 | 5篇 |
1991年 | 6篇 |
1990年 | 8篇 |
1989年 | 1篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 3篇 |
1974年 | 1篇 |
排序方式: 共有1173条查询结果,搜索用时 15 毫秒
151.
De-Heng Shi Heng Ma Jin-Feng Sun Zun-Lue Zhu Yu-Fang Liu Ben-Hai Yu 《Journal of Molecular Structure》2007,824(1-3):71-75
The SAC-CI method is used to investigate the spectroscopic properties of 7Li2(). The adiabatic potential energy curves are calculated and fitted to the analytic Murrell–Sorbie function. The spectroscopic parameters reproduced by the potential attained at cc-PVTZ are found to be very close to the experiments. With the potential obtained at the SAC-CI/cc-PVTZ level of theory, a total of 62 vibrational states is found when J = 0. For each vibrational state, the vibrational level, classical turning points, inertial rotation and centrifugal distortion constants are calculated. Good agreement is obtained when they are compared with the available RKR data. 相似文献
152.
D. V. Isangulova 《Siberian Mathematical Journal》2007,48(6):984-997
This is the second of the author’s three papers on stability in the Liouville theorem on the Heisenberg group. The aim is to prove that each mapping with bounded distortion of a John domain on the Heisenberg group is close to a conformal mapping with order of closeness \(\sqrt {K - 1} \) in the uniform norm and order of closeness K ? 1 in the Sobolev norm L p 1 for all \(p < \tfrac{C}{{K - 1}}\).In this paper we prove a local variant of the desired result: each mapping on a ball with bounded distortion and distortion coefficient K near to 1 is close on a smaller ball to a conformal mapping with order of closeness \(\sqrt {K - 1} \) in the uniform norm and order of closeness K ? 1 in the Sobolev norm L p 1 for all \(p < \tfrac{C}{{K - 1}}\). We construct an example that demonstrates the asymptotic sharpness of the order of closeness of a mapping with bounded distortion to a conformal mapping in the Sobolev norm. 相似文献
153.
The class of mappings with bounded specific oscillation,and integrability of mappings with bounded distortion on Carnot groups 总被引:2,自引:2,他引:0
D. V. Isangulova 《Siberian Mathematical Journal》2007,48(2):249-267
This paper is the first of the author’s three articles on stability in the Liouville theorem on the Heisenberg group. The aim is to prove that each mapping with bounded distortion of a John domain on the Heisenberg group is close to a conformal mapping with order of closeness \(\sqrt {K - 1} \) in the uniform norm and order of closeness K ? 1 in the Sobolev norm L p 1 for all \(p < \tfrac{C}{{K - 1}}\).In the present article we study integrability of mappings with bounded specific oscillation on spaces of homogeneous type. As an example, we consider mappings with bounded distortion on the Heisenberg group. We prove that a mapping with bounded distortion belongs to the Sobolev class W p,loc 1 , where p → ∞ as the distortion coefficient tends to 1. 相似文献
154.
155.
156.
157.
158.
全彩色LED显示屏可以用来显示电视画面。目前没有专门用于LED彩色大屏幕的图像源及其标准,所以都是将送给CRT显像管的图形信号源送到LED彩色大屏幕进行显示。针对把送给CRT的信号送到LED屏进行显示会引起彩色失真这种情况,本文给出LED大屏幕系统的色度公式,为准确控制LED管的发光亮度提供理论依据,并给出产例。 相似文献
159.
The mechanism of the graphics distrotion in a laser display system was studied. Based on the mathematical analysis, the pincushion and linear distortions were calculated. Theoretical results agree well with the experimental observation. By tracing laser beams from image plan back to scanners, a relation between the image points on the screen and the scan angles was built. Thus, it has been able to rectify the scanning distortions by computer software effectively. 相似文献
160.