全文获取类型
收费全文 | 255篇 |
免费 | 45篇 |
国内免费 | 3篇 |
专业分类
化学 | 172篇 |
晶体学 | 5篇 |
力学 | 4篇 |
综合类 | 1篇 |
数学 | 41篇 |
物理学 | 80篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 6篇 |
2020年 | 2篇 |
2019年 | 8篇 |
2018年 | 5篇 |
2017年 | 2篇 |
2016年 | 4篇 |
2015年 | 6篇 |
2014年 | 16篇 |
2013年 | 24篇 |
2012年 | 15篇 |
2011年 | 14篇 |
2010年 | 11篇 |
2009年 | 20篇 |
2008年 | 14篇 |
2007年 | 13篇 |
2006年 | 17篇 |
2005年 | 17篇 |
2004年 | 8篇 |
2003年 | 5篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 9篇 |
1999年 | 7篇 |
1998年 | 4篇 |
1997年 | 1篇 |
1996年 | 8篇 |
1995年 | 5篇 |
1994年 | 2篇 |
1993年 | 8篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 6篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 4篇 |
1980年 | 1篇 |
1978年 | 3篇 |
1977年 | 1篇 |
1974年 | 2篇 |
1964年 | 2篇 |
排序方式: 共有303条查询结果,搜索用时 14 毫秒
1.
2.
We investigate the dependence of the relaxation time of the current flowing in a nematic cell submitted to an external dc voltage on the physical properties of the substrate. We show that previously presented analyses of the same problem are not very useful for practical applications. We compare our theoretical predictions with experimental data, and show that the agreement is rather good. The influence of the adsorption-desorption phenomenon on the relaxation time is also discussed. 相似文献
3.
Zusammenfassung Die allgemeine Verwendbarkeit von modifizierten Bentone-Kolonnen zur Trennung von aromatischen Kohlenwasserstoffen, insbesondere Polyphenylen, wird gezeigt. Trennresultate auf festen Caesiumchlorid-Phasen, die bis 500° C verwendbar und praktisch unbegrenzt haltbar sind, werden gegenübergestellt.Als Beispiele für die Trennung substituierter Aromaten werden bromierte Bi- und Terphenyle angeführt. Es wurden nur gepackte Kolonnen verwendet.
Die vorliegende Arbeit wurde im Rahmen des ReaktorforschungsprogrammsOrgel ausgeführt.
Die Fa. Progil, Lyon, steuerte unter Euratom-Kontrakt wesentliche Ergebnisse und dank langjähriger Erfahrung auf dem Gebiet der Polyphenyle wertvolle fachliche Diskussionen bei.
Die Autoren danken auch Herrn Dr. W.Keess, der als Euratom-Forschungspraktikant insbesondere mit der Ausarbeitung von Analysenmethoden für die leichtersiedenden Anteile der Polyphenylgemische beauftragt war. 相似文献
Summary The general utility of modified Bentone-columns for the separation of aromatic hydrocarbons, especially of polyphenyls, is shown. The separation results are compared with those obtained on solid cesium chloride phases which guarantee an almost unlimited duration of life, even up to 500° C. Mixtures of brominated bi- and terphenyls figure as examples for the separation of substituted aromatics. Packed columns have been used exclusively.
Die vorliegende Arbeit wurde im Rahmen des ReaktorforschungsprogrammsOrgel ausgeführt.
Die Fa. Progil, Lyon, steuerte unter Euratom-Kontrakt wesentliche Ergebnisse und dank langjähriger Erfahrung auf dem Gebiet der Polyphenyle wertvolle fachliche Diskussionen bei.
Die Autoren danken auch Herrn Dr. W.Keess, der als Euratom-Forschungspraktikant insbesondere mit der Ausarbeitung von Analysenmethoden für die leichtersiedenden Anteile der Polyphenylgemische beauftragt war. 相似文献
4.
Abstract We present evidence for the flexo-electric effect in a hybrid aligned nematic cell containing 4-methoxybenzylidene-4'-n-butylaniline (MBBA) subject to d.c. excitation, by comparing the theoretical curve derived by including the flexo-electric term in the free energy with the experimental points. The agreement appears to be very good for MBBA doped with a small amount of an additive which shows reversible electrochemical reactions at very low redox potential; this allows us to determine the sum of the flexo-electric coefficients and the anchoring energy on the planar wall. For undoped MBBA the experimental results can be justified only by assuming a low voltage screening of the electric field, due to the presence of ionic impurities in the material. 相似文献
5.
A. L. Alexe-Ionescu G. Barbero A. Ignatov E. Miraldi 《Applied Physics A: Materials Science & Processing》1993,56(5):453-455
In this paper two types of surface transitions in nematic liquid crystals are theoretically analyzed with a simple model in which the anchoring energy is the result of both steric and electric interactions. The physical model is proper to explain both the transition temperature experimentally observed in homeotropically aligned nematic liquid crystals, and the change in the mean molecular direction due to the variation of the number of surfactant films, piled on the boundary surfaces with the Langmuir-Blodgett technique.Partially supported by the TEMPUS program 相似文献
6.
Zhang LM Zhang ZP Li J Abe K Abe K Adachi I Aihara H Anipko D Arinstein K Asano Y Aushev T Bahinipati S Bakich AM Balagura V Barbero M Bay A Bedny I Belous K Bitenc U Bizjak I Blyth S Bondar A Bozek A Bracko M Brodzicka J Browder TE Chang MC Chang P Chao Y Chen A Chen WT Cheon BG Chistov R Choi SK Choi Y Choi YK Chuvikov A Cole S Dalseno J Danilov M Dash M Drutskoy A Eidelman S Gabyshev N Gershon T Go A Gokhroo G Golob B Gorisek A Ha HC Haba J Hara T Hastings NC Hayasaka K Hayashii H Hazumi M 《Physical review letters》2006,96(15):151801
We report the results of a search for D0-D0 mixing in D0 --> K+ pi- decays based on 400 fb(-1) of data accumulated by the Belle detector at KEKB. Both assuming CP conservation and allowing for CP violation, we fit the decay-time distribution for the mixing parameters x and y, as well as for the parameter R(D), the ratio of doubly Cabibbo-suppressed decays to Cabibbo-favored decays. The 95% confidence level region in the (x'2,y') plane is obtained using a frequentist method. Assuming CP conservation, we find x'2 < 0.72 x 10(-3) and -9.9 x 10(-3) < y' < 6.8 x 10(-3) at the 95% confidence level; these are the most stringent constraints on the mixing parameters to date. The no-mixing point (0,0) has a confidence level of 3.9%. Assuming no mixing, we measure R(D) = (0.377 +/- 0.008 +/- 0.005)%. 相似文献
7.
The mean square tilt angle of a nematic slab with finite anchoring energy and periodic boundary conditions has been theoretically investigated, as a function of the slab geometry and of the reduced extrapolation length. If the anchoring strength is free-surfacelike, the contrast is affected by a loss 10% at room temperature if the ratio between the anchoring pitch and the cell thickness is 0.5.Glossary
anchoring pitch
-
h
cell thickness
-
/h
- ( = x/, = y/h)
reduced coordinates
-
(, )
local tilt angle
-
elastic constant
- wa
anchoring energy anisotropy
-
b=/w
a
de Gennes-Kleman extrapolation length
-
B=b/h
reduced extrapolation length
-
T
NI
nematic-isotropic transition temperature
-
:=(T/T
NI
) – 1
reduced temperature
-
easy axis direction
-
MAX
-
±
2
mean square tilt angle along the boundary
-
()
absorbance coefficients of the p-dye
-
r
/: dichroic ratio
-
c
contrast
-
G
contrast gain
-
S
order parameter 相似文献
8.
G. H. Kaufmann A. M. Lopergolo S. R. Idelsohn E. J. Barbero 《Experimental Mechanics》1987,27(2):154-157
Two techniques, speckle photography and holographic interferometry, were used to test three-dimensional finite-element calculations
in an internally pressurized cylinder with an external part-circular crack. Opening displacements along the crack line were
measured by speckle photography. Radial displacements were obtained from holographic fringe patterns. Good agreement between
experimental and numerical data is obtained. Stress-intensity factor variations along the crack front are calculated from
numerical results. 相似文献
9.
Tian XC Ban Y Abe K Abe K Aihara H Arinstein K Asano Y Aulchenko V Aushev T Bakich AM Banerjee S Barberio E Barbero M Bay A Bedny I Bitenc U Bizjak I Blyth S Bondar A Bozek A Bracko M Brodzicka J Browder TE Chang P Chao Y Chen A Chen KF Chen WT Cheon BG Chistov R Choi SK Choi Y Choi YK Chuvikov A Dalseno J Danilov M Dash M Dong LY Drutskoy A Eidelman S Enari Y Fang F Fratina S Gabyshev N Gershon T Gokhroo G Golob B Gorisek A Haba J Hara T Hayasaka K Hayashii H Hazumi M Hokuue T Hoshi Y Hou S 《Physical review letters》2005,95(23):231801
Using 281 fb-1 of data from the Belle experiment recorded at or near the (4S) resonance, we have measured the rates of the "wrong-sign" decays D0 --> K+ pi- pi0 and D0 --> K+ pi- pi+ pi- relative to those of the Cabibbo-favored decays D0 --> K- pi+ pi0 and D0 --> K- pi+ pi+ pi-. These wrong-sign decays proceed via a doubly Cabibbo-suppressed amplitude or via D0-D0 mixing; the latter has not yet been observed. We obtain R(WS)(K pi pi0) = [0.229 +/- 0.015(stat)(+0.013)(-0.009)(syst)]% and R(WS)(K3pi) = [0.320 +/- 0.018(stat)(+0.018)(0.013)(syst)]%. The CP asymmetries are measured to be -0.006 +/- 0.053 and -0.018 +/- 0.044 for the K+ pi- pi0 and K+ pi- pi+ pi- final states, respectively. 相似文献
10.
We propose and discuss two models that take into account the decreasing of the bulk density of dyes molecules in contact with a porous electrode. We show that the models based on the standard adsorption phenomenon have to be considered just as fitting models, of limited physical significance. A more physical model has to take into account the diffusion of dye molecules into the channels present in the porous electrode and also the adsorption of dye molecules on the lateral surfaces of these channels. The agreement between the theoretical prediction of such a model and the experimental data is reasonably good. 相似文献