Materials Literature
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Extended X-ray absorption fine structure spectroscopy (EXAFS) has been used to characterise polyoxometalate (POM) species and study their reactions on the minute time-scale. Lindqvist-type tungstates have been characterised using quick extended X-ray absorption fine structure spectroscopy (QEXAFS). Differentiation bet…
Structure-property correlations, which direct the formation of specific active-acid sites, in nanoporous materials have been explored with the aim to further the notion of rational catalyst design. It is demonstrated that the influence of the specific zeotype framework extends beyond modulating Brønsted acidity, with…
L'intégration 3D, mode de conception par empilement des puces, vise à la fois la densification des systèmes et la diversification des fonctions. La réduction des dimensions des interconnexions 3D et l'augmentation de la densité de courant accroissent les risques liés à l'électromigration. Une connaissance précise de c…
Ce travail de thèse porte sur la diffusion des porteurs de charge en excès dans deux semiconducteurs à large bande interdite: l’alliage ZnMgO et le diamant 13C. Il est basé sur l’étude d’hétérostructures ZnMgO/ZnO/ZnMgO et 13C/12C/13C à puits de collecte ZnO ou 12C. Sur leurs sections transverses et avec la résolution…
Les propriétés de surface, particulièrement microgéométriques, jouent un rôle essentiel dans tous les systèmes tribologiques. L’analyse de la répartition des efforts de contact dans l’interface entre surfaces rugueuses est indispensable à la prédiction du frottement, de l'usure, de l'adhérence, des résistances de cont…
The article describe saforecast of composite material disruption of a screw cylinder for a screw-rotor-type propeller of an amphibian vehicle. There a real soa three-layered material model for the screw cylinder and modern technologies of space form composite reinforcement offered in the article.
A ferroelectric liquid crystal was synthesised. We attempted electrochemical polymerisation in ferroelectric liquid crystal.
We prepared lyotropic liquid crystal by using disodium cromogrycate that shows liquid crystal by dissolving in water. Next, we added monomer to the prepared solution, and electrolyic polymerisation was carried out. Finally, we obtained a conductive thin polymer film. This result shows that lyotrpic liquid crystal can…
A series of polyaniline/sericin composites were prepared by oxidative polymerisation of aniline in the presence of sericin. The preparation of polyaniline composites containing sericin were confirmed by Fourier-transform infrared spectroscopy. From the result of electron spin resonance spectroscopy, the electron spin…
We carried out electrochemical polymerisation in a cholesteric liquid crystal electrolyte solution. The polymer film prepared in the cholesteric liquid crystal showed chiropticality even though its monomer is an achiral. The surface morphology of the polymer was observed with polarising optical microscopy. Optical and…
MgTiO 3 , MgTi 2 O 5 and Mg 2 TiO 4 were examined as DSC electrodes to improve photoelectric conversion efficiency. MgCO 3 (basic) and TiO 2 powders (nominally, Mg:Ti = 1:1, 1:2 and 2:1 in mole fraction) were wet-ball milled in ethanol for 24 h. The mixed powders were calcined in air at 1100 °C for 2 h to obtain the M…
In liquid crystal materials, the coupling between their elastic field and an external action, such as electric and magnetic fields or the confinement created by free surfaces or cell walls, can give rise to periodic domains. Here, some simple calculations are proposed for nematics in planar cells, where undulations ar…
We study the transition to turbulence of channel flow of finite-size particle\nsuspensions at low volume fraction, i.e. $\\Phi \\approx 0.001$. The critical\nReynolds number above which turbulence is sustained reduces to $Re \\approx\n1675$, in the presence of few particles, independently of the initial\ncondition, a…
International audience
Hexagonal boron nitride (h-BN) is a layered material analogous to graphite that exhibits a hexagonal crystal structure with the lattice parameters of a = 2.50 Å, c = 6.66 Å. In such an h-BN crystal, the hexagonal layers stack each other, and the B3N3 hexagons overlap and alternate with N3B3 hexagons (Figure 4.1). h-BN…
Two-dimensional (2D) nanosheets, because of their ultrasmall thickness in atomic or molecular range and innite lateral dimensions, have been widely considered as the thinnest functional materials [1]. e original work of this 2D materials can be dated back to the 1950s, when some clay minerals dispersed well in water,…
This specification covers the requirements for silver deposited on metal parts with a copper strike between the basis metal and the silver deposit.
У статті розглянуто комплексний підхід до розроблення засобів експрес-діагностики технічного стану лінійної частини магістральних трубопроводів, який включає застосування експериментальних і розрахункових методів визначення напружено-деформованого стану трубопроводів на небезпечних ділянках, у тому числі за наявності…
Abstract ................................................................................................. 152 14.1 Introduction ................................................................................ 152 Keywords .............................................................................................. 1…
Living machines are not intelligently designed and will often be redundant and overly complex – Sir Paul Nurse A reconstructed network can have many functional states even in the same environment. Constraint-based optimization problems can have multiple equivalent solutions that yield the same numerical value of the o…