全文获取类型
收费全文 | 62篇 |
免费 | 5篇 |
国内免费 | 16篇 |
专业分类
化学 | 49篇 |
力学 | 7篇 |
物理学 | 27篇 |
出版年
2023年 | 1篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2016年 | 5篇 |
2015年 | 1篇 |
2013年 | 1篇 |
2012年 | 2篇 |
2011年 | 4篇 |
2010年 | 6篇 |
2009年 | 2篇 |
2008年 | 5篇 |
2007年 | 10篇 |
2006年 | 8篇 |
2005年 | 4篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 1篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1993年 | 4篇 |
1992年 | 4篇 |
1991年 | 1篇 |
1988年 | 1篇 |
排序方式: 共有83条查询结果,搜索用时 281 毫秒
1.
2.
Gao Mingming Wang Jinling Fang Shaojun Nan Jingchang Daming Li 《International Journal of Theoretical Physics》2021,60(7):2358-2367
International Journal of Theoretical Physics - Quantum-dot is the result of elastic relaxation which has a straight relationship with the optical and electronic aspects of the quantum-dot-based... 相似文献
3.
Pan Shiwei Li Puhui Xu Guihua Guo Jingchang Ke Libin Xie Canquan Zhang Zhoucai Hui Yonghai 《Research on Chemical Intermediates》2020,46(2):1353-1371
Research on Chemical Intermediates - Heterogeneous ordered mesoporous silica materials catalyst, MCM-41@Schiff base-Co(AcO)2, reveals high catalytic performance within the synthesis of pyran... 相似文献
4.
5.
The enlargement of the emitting aperture is usually one of the important methods of increasing vertical- cavity surface-emitting laser (VCSEL) optical output power. However, in a VCSEL with a larger aperture, the inhomogeneity in the injected current often causes inhomogeneous or even no emission. To solve this problem and to increase VCSEL output power, as well as to improve its thermal characteristics, we develop a new type of injected VCSEL with a larger aperture and a reticular electrode, where the conventional circular injection electrode of the P side is turned into a reticular one, and the heat sink is on the N side. The tests of the new VCSEL show an improvement in homogeneity in not only the injected current but also the emission intensity. The optical output power is also considerably increased, and the device optoelectronic performance is improved. 相似文献
6.
Yongle Wu Yuanan Liu Shulan Li Jingchang Nan 《International Journal of Infrared and Millimeter Waves》2008,29(12):1146-1155
The rigorous analytical solutions and the ABCD matrix of the lossy Cosine-Squared tapered nonuniform transmission lines (CSTNTL)
are presented in this paper. According to different boundary conditions, the unique solution is obtained mathematically. Through
the numerical calculations based on analytical solutions, the distributed voltages and currents in different terminated cases
are shown to explain the transmission characteristics of CSTNTL. Especially in the lossy case the distributed power values
are simulated to show the attenuation phenomenon. 相似文献
7.
Yali Fu Jingchang Zhang Zhong Huang Xiuyu Wang Yuguang Lv Weiliang Cao 《Journal of photochemistry and photobiology. A, Chemistry》2008,197(2-3):329-334
Four ternary complexes of Tb(III) were synthesized by introducing the first ligand (L1) (N-phenylanthranilic acid (N-HPA), α-furoic acid (FURA)) and the second ligand (L2) (1,10-phenanthroline (Phen), 2,2′-dipyridyl (Bipy)), respectively. These complexes were characterized by elemental analysis, infrared spectra, XRD, UV spectra and fluorescence spectra. The effect of L1 and L2 on the fluorescence properties of terbium complexes was discussed. It showed that all the complexes exhibited ligand-sensitized green emission. The fluorescent intensity increased in the sequence of Tb(FURA)3Bipy < Tb(N-PA)3Phen < Tb(FURA)3Phen < Tb(N-PA)3Bipy. It indicated that L1 affected fluorescence properties of the complexes differently when the corresponding L2 altered. Meanwhile, the influence of L2 on the luminescence properties of the complexes also depends on L1. The results showed that L1 and L2 affected each other and worked together as a whole. The matching of L1, L2 and Tb3+ ion is very important to the luminescence properties of Tb(III) ternary complexes. 相似文献
8.
Yao Qian Zhiyue Han Yinghao Zhang Zhiming Du Yan Zhao Yuezhen Yang Jingchang Zhang 《Journal of heterocyclic chemistry》2016,53(2):651-657
1,5‐diaminotetrazolium chloride (DATC) and 1,5‐diaminotetrazolium sulfate (DATS) were synthesized in this work. The structures of DATS and DATC were characterized. The single crystal of DATS was first cultured, and its structure was analyzed. The thermal behavior of DATS was investigated. The activation energy and pro‐exponential factor were calculated, Ek = 120.86 KJ/mol, Ak = 1012.96 s?1. The density, heat of formation, detonation pressure, and detonation velocity of DATS were first calculated. The detonation pressure and detonation velocity of DATS are P = 11.877 GPa, D = 5.617 km s?1, which are smaller than those of 1,5‐diaminotetrazolium nitrate (DATN) (P = 33.3GPa, D = 8.77 km s?1). 相似文献
9.
Jingchang Sun Hongwei Liang Jianze Zhao Ziwen Zhao Guotong Du 《Applied Surface Science》2007,253(11):5161-5165
ZnO films were deposited on c-plane Al2O3 substrates by pulsed laser deposition. The etching treatments for as-grown ZnO films were performed in NH4Cl aqueous solution as a function of NH4Cl concentration and etching time. It was found that NH4Cl solution is an appropriate candidate for ZnO wet etching because of its controllable and moderate etching rate. The influence of etching treatment on the morphology, optical and electrical properties of the ZnO films has been investigated systematically by means of X-ray diffraction, atomic force microscope, photoluminescence and Hall effect. The results indicated that the surface morphology and optical properties of the films were highly influenced by etching treatment. 相似文献
10.
Equilibrium geometries, interaction energies, and charge transfer for the intermolecular interactions between BrF and HnX (HF, H2O, and NH3) were studied at the MP2/6-311++G(3d,3p) level. The halogen-bonded geometry and hydrogen-bonded geometry are observed in these interactions. The calculated interaction energies show that the halogen-bonded structures are more stable than the corresponding hydrogen-bonded structures. To study the nature of the intermolecular interactions, symmetry-adapted perturbation theory (SAPT) calculations were carried out and the results indicate that the halogen bonding interactions are dominantly inductive energy in nature, while electrostatic energy governs the hydrogen bonding interactions. 相似文献