全文获取类型
收费全文 | 206篇 |
免费 | 9篇 |
专业分类
化学 | 119篇 |
晶体学 | 7篇 |
力学 | 7篇 |
数学 | 26篇 |
物理学 | 56篇 |
出版年
2022年 | 6篇 |
2021年 | 8篇 |
2020年 | 6篇 |
2019年 | 5篇 |
2018年 | 3篇 |
2017年 | 4篇 |
2016年 | 17篇 |
2015年 | 9篇 |
2014年 | 11篇 |
2013年 | 10篇 |
2012年 | 12篇 |
2011年 | 15篇 |
2010年 | 12篇 |
2009年 | 14篇 |
2008年 | 9篇 |
2007年 | 17篇 |
2006年 | 14篇 |
2005年 | 9篇 |
2004年 | 9篇 |
2003年 | 7篇 |
2001年 | 5篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1992年 | 2篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有215条查询结果,搜索用时 0 毫秒
81.
Emre Aslan Dr. Ilker Akin Dr. Imren Hatay Patir 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(15):5342-5349
Hydrogen evolution at polarized liquid–liquid interfaces [water/1,2‐dichloroethane (DCE)] by the electron donor decamethylferrocene (DMFc) is catalyzed efficiently by the fabricated cobalt sulfide (CoS) nanoparticles and nanocomposites of CoS nanoparticles formed on multi‐walled carbon nanotubes (CoS/CNT). The suspended CoS/CNT nanocomposite catalysts at the interface show a higher catalytic activity for the hydrogen evolution reaction (HER) than the CoS nanoparticles due to the high dispersity and conductivity of the CNT materials, which can serve as the main charge transport pathways for the injection of electrons to attain the catalytic sites of the nanoparticles. The reaction rate increased more than 1000‐fold and 300‐fold by using CoS/CNT and CoS catalysts, respectively, when compared to a non‐catalyzed reaction. 相似文献
82.
We have performed first-principles method to investigate structural and electronic properties of InNxP1?x ternary semiconductor alloy in full range (0 ≤ x ≤ 1) using density functional theory. We have used modified Becke–Johnson potential to obtain accurate band gap results. From the electronic band structure calculation we have found that InNxP1?x become metal between 47 and 80% of nitrogen concentration. Additional to our band gap calculations, we have also used the band anticrossing model. The band anticrossing model supplies a simple, analytical expression to calculate the physical properties, such as the electronic and optical properties, of III-NxV1?x alloys. The knowledge of the electron density of states is required to understand and clarify some properties of materials such as the band structures, bonding character and dielectric function. In order to have a deeper understanding of these properties of the studied materials, the total and partial density of states has been calculated. Finally, we have calculated the total bowing parameter b of studied alloys, together with three contributions bVD, bCE, and bSR due to volume deformation, different atomic electron negativities and structural relaxation, respectively. 相似文献
83.
84.
85.
86.
H. C. Liu B. Aslan M. Korkusinski S. -J. Cheng P. Hawrylak 《Infrared Physics & Technology》2003,44(5-6):503-508
The results of a detailed characterization study on a systematic set of InAs/GaAs self-assembled quantum dot infrared photodetectors are presented. A simple physical picture is also discussed to account for the main observed features. Photoresponse characteristics in a wide spectral region from the mid- to far-infrared are reported. Clear polarization behaviors with a dominant P-polarized response in the mid-infrared and a strong S-response in the far-infrared regions are shown. These behaviors can be qualitatively understood in view of the quantum dot shape of a large in-plane diameter and a small height in the growth direction. With a set of three samples, effects of the number of electrons per quantum dot on the spectra are investigated. 相似文献
87.
Thermal characteristics of a new thiophene derivative, 2-(thiophen-3-yl-)ethyl octanoate (OTE), its homopolymer (POTE), and
copolymer with thiophene P(OTE-co-Th) were investigated via pyrolysis mass spectrometry. Thermal degradation of the copolymer
started by lose of side chains and thiophene involving products evolved almost in the same temperature range where PTh degradation
was detected, at slightly higher temperatures than PTh backbone decomposed during the pyrolysis of POTE. The extent of doping
and network structure decreased in the order POTE<P(OTE-co-Th)<PTh. 相似文献
88.
İsmail Aslan 《Communications in Nonlinear Science & Numerical Simulation》2012,17(12):5286-5287
We show that two of the nonlinear lattice equations studied by Ayhan & Bekir [Commun Nonlinear Sci Numer Simulat 17 (2012) 3490–3498] have already been investigated by Aslan [Commun Nonlinear Sci Numer Simulat 15 (2010) 1967–1973] using an improved version of the same method. The solutions obtained by the latter one include the solutions obtained by the former one. 相似文献
89.
90.
Sıdır Yadigar Gülseven Aslan Cebrail Berber Halil Sıdır İsa 《Structural chemistry》2019,30(3):835-851
Structural Chemistry - The electronic structure and electronic transitions of four new mono Schiff base derivatives are interpreted by using absorption and fluorescence spectra including 28... 相似文献