全文获取类型
收费全文 | 107篇 |
免费 | 3篇 |
专业分类
化学 | 86篇 |
力学 | 6篇 |
数学 | 1篇 |
物理学 | 17篇 |
出版年
2023年 | 1篇 |
2020年 | 2篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 2篇 |
2013年 | 3篇 |
2012年 | 7篇 |
2011年 | 9篇 |
2010年 | 5篇 |
2009年 | 3篇 |
2008年 | 9篇 |
2007年 | 4篇 |
2006年 | 7篇 |
2005年 | 7篇 |
2004年 | 6篇 |
2003年 | 5篇 |
2002年 | 3篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1985年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 2篇 |
排序方式: 共有110条查询结果,搜索用时 15 毫秒
101.
Tz. Ivanova A. Malzert F. Boury J. E. Proust R. Verger I. Panaiotov 《Colloids and surfaces. B, Biointerfaces》2003,32(4):307-320
The mechanism of the hydrolysis by cutinase and the progressive fragmentation of lactic chains in diblock copolymers of PLA with various sizes attached to PEG were studied in a 2D monolayers model system. The hydrolysis kinetics was followed by measuring simultaneously the decrease of the surface area and evolution of the surface potential with time at barostatic conditions. The decrease of the surface area is due to the solubilization of the copolymers as well as of their hydrolytic products: detached PEG blocks and small soluble PLA fragments. The evolution of the surface potential detects the transient interfacial accumulation of charged insoluble PLA fragments. A kinetic model describing the enzymatic hydrolysis was developed and the values for the global hydrolytic kinetic constant were obtained without any fitting parameter. It was found that the global kinetic constant no practically depend on the length of the lactic and the presence of polyethylene–glycol chains. 相似文献
102.
Summary Monolayers of hexadecyltrimethylammonium bromide produce homeotropic or planar alignments of liquid crystals p-n-methoxybenzilidene aniline and pmethoxyphenylazo-p-butylbenzene.The effect of the temperature on the free energy of adhesion and on the wetting hysteresis shows that for the planar structure at the solid-liquid interface a thick liquid film is formed on the solid; the existence of this thick liquid film is attributed to the elastic energy imposed on a liquid crystal by different anchorages at the solid-liquid and liquid-vapor interfaces.
Zusammenfassung Monomolekulare Schichten von Hexadecyltrimethylammoniumbromid erzeugen homeotrope oder planare Anordnung von Flüssigkristallen wie p-nMethoxybenzilidin-anilin und p-Methoxyphenylazo-p-butylbenzol.相似文献
103.
104.
Minkov I Ivanova T Panaiotov I Proust J Verger R 《Colloids and surfaces. B, Biointerfaces》2005,45(1):24-34
The action of the hydrolytic enzymes humicola lanuginosa lipase (HLL) and pancreatic phospholipase A2 (PLA2) on monolayers formed from lipid nanocapsules (LNC) and model monolayers containing their components, Labrafac, Solutol and Lipoid, is studied by simultaneous measuring the changes in the film area and the surface potential in the "zero order" trough at constant surface pressure (pi). The kinetic models describing the hydrolysis by HLL of the Labrafac, Solutol and their mixtures have been proposed. By using the developed theoretical approach together with the experimental results the surface concentrations of the substrates, hydrolysis products and values of the global kinetic constants were obtained. The comparison between the global kinetic constants in the case of HLL hydrolysis of pure Labrafac, Solutol monolayers and those of the model mixed Labrafac/Solutol monolayers, shows that the rates of hydrolysis are of the same order of magnitude, i.e. an additively of the HLL enzyme action is observed. The composition of the mixed Labrafac/Solutol monolayer, formed after the interfacial LNC destabilization, was estimated. 相似文献
105.
G. Proust G. C. Kaschner I. J. Beyerlein B. Clausen D. W. Brown R. J. McCabe C. N. Tomé 《Experimental Mechanics》2010,50(1):125-133
Twinning is an important deformation mode in hexagonal metals to accommodate deformation along the c-axis. It differs from slip in that it accommodates shear by means of crystallographic reorientation of domains within the
grain. Such reorientation has been shown to be reversible (detwinning) in magnesium alloy aggregates. In this paper we perform
in-situ neutron diffraction reversal experiments on high-purity Zr at room temperature and liquid nitrogen temperature, and follow
the evolution of twin fraction. The experiments were motivated by previous studies done on clock-rolled Zr, subjected to deformation
history changes (direction and temperature), in the quasi-static regime, for temperatures ranging from 76 K to 450 K. We demonstrate
here for the first time that detwinning of { 10[`1] 2 }
á 10[`1][`1]
ñ\left\{ {10\overline 1 2} \right\}\left\langle {10\overline 1 \overline 1 } \right\rangle tensile twins is favored over the activation of a different twin variant in grains of high-purity polycrystalline Zr. A visco-plastic
self-consistent (VPSC) model developed previously, which includes combined slip and twin deformation, was used here to simulate
the reversal behavior of the material and to interpret the experimental results in terms of slip and twinning activities. 相似文献
106.
Tz. Ivanova I. Panaiotov F. Boury P. Saulnier J. E. Proust R. Verger 《Colloids and surfaces. B, Biointerfaces》2000,17(4)
The hydrolysis kinetics of insoluble poly-(
,
-lactide) monolayers spread on basic or acidic aqueous subphase were followed by measuring simultaneously the decrease in the surface area at constant surface pressure and the evolution of the surface potential. An approach to analyse the role of the electrostatic interactions during the hydrolysis at alkaline pH, interpreting the surface potential data was developed. The theoretical predictions based on the idea of a random fragmentation of polymer molecules leading to the interfacial accumulation of charged insoluble products and solubilisation of small fragments describes well the experimental results. The reversibility of the hydrolysis/esterification reaction at acidic pH is taken into account. 相似文献
107.
108.
Zhou X Schmidt B Proust C Gervais G Pfeiffer LN West KW Sarma SD 《Physical review letters》2011,107(8):086804
We report the observation of an apparent parallel magnetic-field-induced metal-insulator transition in a high-mobility two-dimensional electron gas for which spin and localization physics most likely play no major role. The high-mobility metallic phase at low field is consistent with the established Fermi liquid transport theory including phonon scattering, whereas the phase at higher field shows a large insulatinglike negative temperature dependence at resistances much smaller than the quantum of resistance h/e(2). We argue that this observation is a direct manifestation of a quantum-classical crossover arising predominantly from the magneto-orbital coupling between the finite width of the two-dimensional electron gas and the in-plane magnetic field. 相似文献
109.
K. Balashev I. Panaiotov M. Ivanova I Petkov J. E. Proust F. Boury 《Journal of Dispersion Science and Technology》2013,34(6-7):661-681
The influence of pH on the properties of polyacryloylacetone (PAA) monolayers at air/water interface was examined by using surface pressure-area isotherm measurement,a new rheological approach and AFM imaging. The isotherms and AFM-imaging detect phase transitions in PAA monolayers and growth of microdomains during compression in the case of pH 6.6 and missing of such kind of structures at pH 9. The rheological study below and above the phase transition shows an existence of a large relaxation time related to the process of formation of microdomains. The influence of divalent ions on the properties of a PAA monolayer was studied. The presence of Cu2+ ions leads to polymer - ion interaction which results in the formation of microdomains. 相似文献
110.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option. 相似文献