全文获取类型
收费全文 | 1645篇 |
免费 | 65篇 |
国内免费 | 3篇 |
专业分类
化学 | 1364篇 |
晶体学 | 15篇 |
力学 | 20篇 |
数学 | 120篇 |
物理学 | 194篇 |
出版年
2023年 | 6篇 |
2021年 | 11篇 |
2020年 | 11篇 |
2019年 | 21篇 |
2018年 | 21篇 |
2017年 | 9篇 |
2016年 | 42篇 |
2015年 | 39篇 |
2014年 | 44篇 |
2013年 | 81篇 |
2012年 | 72篇 |
2011年 | 94篇 |
2010年 | 65篇 |
2009年 | 35篇 |
2008年 | 88篇 |
2007年 | 68篇 |
2006年 | 84篇 |
2005年 | 72篇 |
2004年 | 79篇 |
2003年 | 94篇 |
2002年 | 77篇 |
2001年 | 25篇 |
2000年 | 54篇 |
1999年 | 25篇 |
1998年 | 18篇 |
1997年 | 25篇 |
1996年 | 26篇 |
1995年 | 26篇 |
1994年 | 23篇 |
1993年 | 21篇 |
1992年 | 22篇 |
1991年 | 18篇 |
1990年 | 17篇 |
1989年 | 6篇 |
1988年 | 16篇 |
1987年 | 9篇 |
1986年 | 8篇 |
1985年 | 22篇 |
1984年 | 23篇 |
1983年 | 11篇 |
1982年 | 26篇 |
1981年 | 24篇 |
1980年 | 29篇 |
1979年 | 29篇 |
1978年 | 23篇 |
1977年 | 14篇 |
1976年 | 15篇 |
1974年 | 7篇 |
1973年 | 11篇 |
1968年 | 5篇 |
排序方式: 共有1713条查询结果,搜索用时 15 毫秒
141.
Dynamic properties of combustion instability in a lean premixed gas-turbine combustor 总被引:1,自引:0,他引:1
We experimentally investigate the dynamic behavior of the combustion instability in a lean premixed gas-turbine combustor from the viewpoint of nonlinear dynamics. A nonlinear time series analysis in combination with a surrogate data method clearly reveals that as the equivalence ratio increases, the dynamic behavior of the combustion instability undergoes a significant transition from stochastic fluctuation to periodic oscillation through low-dimensional chaotic oscillation. We also show that a nonlinear forecasting method is useful for predicting the short-term dynamic behavior of the combustion instability in a lean premixed gas-turbine combustor, which has not been addressed in the fields of combustion science and physics. 相似文献
142.
143.
A new sampling method is proposed for projector Monte Carlo (PMC) calculations based on Slater determinants (SD) in singlet states. Using the symmetry of the ?? and ?? electron determinants, the number of configurations to be considered can be about one-half of the original sampling. We applied the new sampling to the PMC-SD calculations of the H2O molecule in the ground state. The results were always improved by the new sampling method both for the equilibrium and for bond-stretched structures. 相似文献
144.
145.
146.
147.
Sakihito Kitajima Kaeko Kamei Shigeru Taketani Masamitsu Yamaguchi Fumiko Kawai Aino Komatsu Yoshihiro Inukai 《BMC biochemistry》2010,11(1):6
Background
Plant latex is the cytoplasm of highly specialized cells known as laticifers, and is thought to have a critical role in defense against herbivorous insects. Proteins abundantly accumulated in latex might therefore be involved in the defense system. 相似文献148.
Hiroshi Niki 《Journal of Computational and Applied Mathematics》2010,234(12):3507-3510
In this work, we point out that there are incorrect assertions in the article by Li-Ying Sun (Li-Ying Sun, A comparison theorem for the SOR iterative method, J. Comput. Appl. Math. 181 (2005) 336-341). Moreover, we answer an open problem. 相似文献
149.
Shigeru Arimoto Mark Spivakovsky Hiromu Ohno Peter Zizler Keith F. Taylor Tokio Yamabe Paul G. Mezey 《International journal of quantum chemistry》2001,84(4):389-400
The present Part VI of this series of articles provides a mathematical and methodical link between (i) fundamental methodology in the repeat space theory (RST), which is referred to as the approach via the aspect of form and general topology and which has universal unifying power to handle additivity problems of molecules that have many identical moieties, and (ii) frontier electron theory of reactivity indices. Using theoretical tools required to link (i) and (ii), we establish a theorem from which the Generalized Alpha Existence Theorem (a theorem essential in the RST and proved in the previous Part V) directly follows. © 2001 John Wiley & Sons, Inc. Int J Quantum Chem 84: 389–400, 2001 相似文献
150.
A commutative fusion algebra is proved to be amenable if and only if the associated regular representation is bounded. 相似文献