全文获取类型
收费全文 | 139篇 |
免费 | 7篇 |
国内免费 | 3篇 |
专业分类
化学 | 92篇 |
晶体学 | 1篇 |
力学 | 2篇 |
数学 | 10篇 |
物理学 | 44篇 |
出版年
2021年 | 2篇 |
2020年 | 4篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2016年 | 2篇 |
2014年 | 3篇 |
2013年 | 6篇 |
2012年 | 8篇 |
2011年 | 16篇 |
2010年 | 5篇 |
2007年 | 3篇 |
2006年 | 5篇 |
2005年 | 3篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 5篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1997年 | 7篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 5篇 |
1986年 | 2篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1968年 | 2篇 |
1959年 | 1篇 |
1958年 | 1篇 |
1898年 | 1篇 |
1872年 | 1篇 |
排序方式: 共有149条查询结果,搜索用时 31 毫秒
11.
12.
Silicon nitride/silicon oxide interlayers for solar cell passivating contacts based on PECVD amorphous silicon
下载免费PDF全文
![点击此处可从《固体物理学:研究快报》网站下载免费的PDF全文](/ch/ext_images/free.gif)
This Letter demonstrates improved passivating contacts for silicon solar cells consisting of doped silicon films together with tunnelling dielectric layers. An improvement is demonstrated by replacing the commonly used silicon oxide interfacial layer with a silicon nitride/silicon oxide double interfacial layer. The paper describes the optimization of such contacts, including doping of a PECVD intrinsic a‐Si:H film by means of a thermal POCl3 diffusion process and an exploration of the effect of the refractive index of the SiNx. The n+ silicon passivating contact with SiNx /SiOx double layer achieves a better result than a single SiNx or SiOx layer, giving a recombination current parameter of ~7 fA/cm2 and a contact resistivity of ~0.005 Ω cm2, respectively. These self‐passivating electron‐selective contacts open the way to high efficiency silicon solar cells. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim) 相似文献
13.
We have measured transient photoconductivity in functionalized pentacene molecular crystals using ultrafast optical pump-terahertz probe techniques. The single crystal samples were excited using 800 nm, 100 fs pulses, and the change in transmission of time-delayed, subpicosecond terahertz pulses was used to probe the photoconducting state over a temperature range from 10 to 300 K. A subpicosecond rise in photoconductivity is observed, suggesting that mobile carriers are a primary photoexcitation. At times longer than 4 ps, a power-law decay is observed consistent with dispersive transport. 相似文献
14.
Hegedus LS Greenberg MM Wendling JJ Bullock JP 《The Journal of organic chemistry》2003,68(11):4179-4188
Several dioxocyclams containing quinoxaline moieties, as well as their nickel(II) complexes were synthesized and studied for their ability to bind and oxidatively cleave DNA. Although no evidence for binding by intercalation was found, the ability of the Ni(II) complexes to cleave DNA in the presence of Oxone was strongly dependent on both the nature and the spatial orientation of the quinoxaline moieties, suggesting at least transient association of these complexes with DNA. 相似文献
15.
16.
G. T. Jones R. W. L. Jones B. W. Kennedy S. W. O'Neale H. Klein D. R. O. Morrison P. Schmid H. Wachsmuth F. Hamisi D. B. Miller M. M. Mobayyen S. Wainstein M. Aderholz D. Hantke E. Hoffmann U. F. Katz J. Kern N. Schmitz W. Wittek G. Corrigan G. Myatt D. Radojicic P. N. Shotton S. J. Towers F. W. Bullock S. Burke 《Zeitschrift fur Physik C Particles and Fields》1989,44(3):379-384
Within the framework of the quark-parton model, the quark and anti-quark structure functions of the proton have been measured by fitting them to the distributions of the events in the Bjorkeny variable. The data used form the largest sample of neutrino and antineutrino interactions on a pure hydrogen target available, and come from exposures of BEBC to the CERN wide band neutrino and antineutrino beams. It is found that the ratiod v /u v of valence quark distributions falls with increasing Bjorkenx. In the context of the quark-parton model the results constrain the isospin composition of the accompanying diquark system. Models involving scattering from diquarks are in disagreement with the data. 相似文献
17.
Jones G. T. Jones R. W. L. Kennedy B. W. Klein H. Morrison D. R. O. Wachsmuth H. Miller D. B. Mobayyen M. M. Wainstein S. Aderholz M. Hantke D. Katz U. F. Kern J. Schmitz N. Wittek W. Borner H. P. Myatt G. Cooper-Sarkar A. M. Guy J. Venus W. Bullock F. W. Burke S. 《Zeitschrift fur Physik C Particles and Fields》1994,63(4):601-609
Zeitschrift für Physik C Particles and Fields - A set of proton longitudinal polarized distributions, worked out under the assumption of small gluon polarization, is used to evaluate several... 相似文献
18.
Fedorov O Huber K Eisenreich A Filippakopoulos P King O Bullock AN Szklarczyk D Jensen LJ Fabbro D Trappe J Rauch U Bracher F Knapp S 《Chemistry & biology》2011,18(1):67-76
There is a growing recognition of the importance of protein kinases in the control of alternative splicing. To define the underlying regulatory mechanisms, highly selective inhibitors are needed. Here, we report the discovery and characterization of the dichloroindolyl enaminonitrile KH-CB19, a potent and highly specific inhibitor of the CDC2-like kinase isoforms 1 and 4 (CLK1/CLK4). Cocrystal structures of KH-CB19 with CLK1 and CLK3 revealed a non-ATP mimetic binding mode, conformational changes in helix αC and the phosphate binding loop and halogen bonding to the kinase hinge region. KH-CB19 effectively suppressed phosphorylation of SR (serine/arginine) proteins in cells, consistent with its expected mechanism of action. Chemical inhibition of CLK1/CLK4 generated a unique pattern of splicing factor dephosphorylation and had at low nM concentration a profound effect on splicing of the two tissue factor isoforms flTF (full-length TF) and asHTF (alternatively spliced human TF). 相似文献
19.
Applications of wavelength-modulation spectroscopy in resolution of pressure and modulation broadened spectra 总被引:1,自引:0,他引:1
Theoretical and experimental results for modulation absorption spectroscopy (with simultaneous amplitude and wavelength modulations) are given, with particular emphasis on the effects of pressure and modulation broadening. As expected, such broadening effects result in a loss of resolution of nearly overlapping lines, whether these are from one or more absorbing species. The effects of phase-sensitive detection at harmonics greater than the commonly used second are investigated. It is shown that when detection is performed at higher harmonics, one is able to counter the loss of resolution due to pressure and modulation broadening. Applications in measurements of congested spectra, and in the simultaneous measurement of more than one species, are discussed. Other general characteristics of signals obtained by using higher-harmonic detection are also discussed, together with corresponding applications. 相似文献
20.