全文获取类型
收费全文 | 677篇 |
免费 | 21篇 |
国内免费 | 9篇 |
专业分类
化学 | 362篇 |
晶体学 | 1篇 |
力学 | 18篇 |
数学 | 59篇 |
物理学 | 267篇 |
出版年
2023年 | 7篇 |
2022年 | 6篇 |
2021年 | 16篇 |
2020年 | 20篇 |
2019年 | 12篇 |
2018年 | 13篇 |
2017年 | 5篇 |
2016年 | 13篇 |
2015年 | 7篇 |
2014年 | 13篇 |
2013年 | 41篇 |
2012年 | 35篇 |
2011年 | 34篇 |
2010年 | 16篇 |
2009年 | 31篇 |
2008年 | 30篇 |
2007年 | 34篇 |
2006年 | 21篇 |
2005年 | 26篇 |
2004年 | 28篇 |
2003年 | 18篇 |
2002年 | 13篇 |
2001年 | 12篇 |
2000年 | 15篇 |
1999年 | 14篇 |
1998年 | 7篇 |
1997年 | 3篇 |
1996年 | 12篇 |
1995年 | 10篇 |
1994年 | 9篇 |
1993年 | 19篇 |
1992年 | 16篇 |
1991年 | 14篇 |
1990年 | 15篇 |
1989年 | 11篇 |
1988年 | 10篇 |
1987年 | 11篇 |
1986年 | 11篇 |
1985年 | 12篇 |
1984年 | 7篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1980年 | 10篇 |
1978年 | 8篇 |
1977年 | 4篇 |
1976年 | 6篇 |
1974年 | 5篇 |
1971年 | 3篇 |
1958年 | 3篇 |
1935年 | 2篇 |
排序方式: 共有707条查询结果,搜索用时 15 毫秒
91.
The thermal conductivity, κ, of NbSe3 has been measured by novel self-heating techniques that allowed the electric field dependence of κ to also be measured. Measurements were made from 35 K to room temperature. Above the charge density wave transitions, the phonon thermal conductivity is 4–7 times the electron thermal conductivity, and it rises smoothly below the transitions, indicating that phonon-phonon scattering predominates. Phonon mean free parths have been estimated at 187 A° at 60 K and 60 A° at 150 K. No clear anomalies were observed at the phase transitions, giving upper limits to changes in the phonon mean free path. No field dependence of κ was observed. 相似文献
92.
Dirac-Fock calculations show dramatic variations of the asymmetry parameter with energy for Cs 6s in contrast to the β = 2 prediction of more approximate theories. 相似文献
93.
94.
A new methodology utilizing a redox-triggered activation for the facile release of dendrimer end groups is reported. 相似文献
95.
96.
97.
98.
Y. Kondo T. Nakamura Y. Satou T. Matsumoto N. Aoi N. Endo N. Fukuda T. Gomi Y. Hashimoto M. Ishihara S. Kawai M. Kitayama T. Kobayashi Y. Matsuda N. Matsui T. Motobayashi T. Nakabayashi T. Okumura H.J. Ong T.K. Onishi K. Ogata H. Otsu H. Sakurai S. Shimoura M. Shinohara T. Sugimoto S. Takeuchi M. Tamaki Y. Togano Y. Yanagisawa 《Physics letters. [Part B]》2010
99.
In this paper, a cost-based job shop problem (JIT-JSP) is proposed to model the multi-order processing procedure in a just-in-time (JIT) environment. The objective of JIT-JSP is to minimize three costs: work-in-process holding cost of half-finished orders, inventory holding cost of finished orders and backorder cost of unfulfilled orders. A modified tabu search (MTS) method is developed to improve the schedule quality by searching the neighbourhood of a feasible schedule iteratively. The MTS method is comprised of three components that help to ensure a more effective searching procedure: neighbourhood structure, memory structure and filter structure. Computational results show that the MTS method significantly improves the initial schedule generated by an arbitrarily selected dispatching rule. 相似文献
100.
Raman spectroscopy has demonstrated great potential in clinical and biomedical applications. However, slow data acquisition due to weak Raman signals has prevented its wide use, especially in an imaging setup. In this paper, we propose a novel solution in which the full Raman spectrum can be rapidly reconstructed from a few narrow‐band measurements based on Wiener estimation. This method, using both traditional Wiener estimation and modified Wiener estimation, has been evaluated on Raman spectra collected from live, apoptotic and necrotic leukemia cells with several different types of band‐pass filter choices. Two rules of thumb were identified to guide the choice of filters. Our results indicate that the agreement between reconstructed and measured Raman spectra was excellent according to either the mean root mean square error or the classification accuracy. Therefore, Raman reconstruction from narrow‐band measurements represents a new direction in fast Raman imaging for the investigation of fast changing phenomena. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献