Materials Literature
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Perovskite structures including oxygen vacancies are the most important group of the oxygen preamble membranes. These membranes have potentially attractive applications in the membrane reactors for partial oxidation of methane. Doping Perovskite phase in order to increase the oxygen vacancies and oxygen permeation, be…
In this paper the determination of catalytic activities of nanoporous KAU and SKN carbon materials, as well as catalytic activities of their modifi ed (oxygen-and nitrogen-containing) forms and of enzyme catalase by calculating the Michaelis constants according to the kinetics of substrate decomposition has been repor…
Different quench sensitivity behaviours for aluminium alloys 7150, 7055, 7085 and 7037 have been systematically studied by using small angle X-ray scattering (SAXS) at the Australian synchrotron. The results have shown that due to different chemical compositions, the ageing behaviour is different after different cooli…
The study presents the approach to defining the effective coefficients of thermal expansion and effective characteristics of elasticity (effective bulk modulus and effective shear modulus) for micro-heterogeneous materials with the internal structure. The proposed method is based on the mathematical model of the multi…
The phenomenon of lead related venous stenosis is generally known, but it's scale (frequency, degree and extensiveness) has been not analysed in large patients groups. Objective: Retrospective analysis of preoperative venography in the aspect of appearance and comprehension of venous stenosis / occlusion. Methods: In…
The paper presents the results on the study of the potassium nitrate dosimeter to estimate the characteristics of the pulsed electron radiation with an electron energy of 500 keV. One of the final products formed after potassium nitrate radiation is nitrite ion, whose radiation-chemical yield is constant and it equals…
Background: Cardiac resynchronization therapy (CRT) is established therapy in select patients with heart failure. Quadripolar left ventricular (LV) pacing leads have been developed to mitigate phrenic nerve pacing and facilitate lead stability and non-apical pacing. However, to date, pacing from non-distal electrodes…
(Bi2O3Fe2O3)0.4(Nb2O5Nd2O3)0.6was syhthesised by solid state reaction method for studying the properties of the material. Synthesized material was sintered at two different temperature (1000°C and 1150°C). X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Dielectric property and DC resistivity of the materi…
Introduction: Biventricular depolarization times derived from high-resolution electrocardiographic mapping (ECM) can be used to calculate a vector which expresses both magnitude and direction of electrical dyssynchrony in 3D. We investigated whether this ECM vector could predict acute response in CRT candidates. Metho…
Les septines sont des GTPases conservées dérégulées dans le cancer et les maladies neurodégénératives. Elles servent de protéines d’échafaudage et forment une barrière de diffusion à la membrane plasmique et au corps central lors de la cytokinèse. Elles interagissent avec l’actine et s’organisent en complexes qui poly…
In this paper, vibration of a nonlinear composite beam is analyzed and then an active controller is used to control the vibrations of the system. The beam is resting on a Winkler-Pasternak elastic foundation. The composite beam is reinforced by single walled carbon nanotubes. Using the rule of mixture, the material pr…
L’objectif de ce travail est l’étude thermodynamique et structurale du nanocomposite le polyéthylène haute densité contenant 5% de nanotube de carbone multiparois (NTCM).Les résultats dilatométriques montrent que les NTCM sont responsables de la diminution de l’anisotropie. Le pouvoir calorifique du nanocomposite PE +…
It is found out that the rate of oxidation of a massive zirconium plate by supercritical water at 823 K and ~25 MPa increases under the action of constant electric field of ~300 kV/m. The formed oxide layer undergoes strong destructions of a top part and strong inhomogeneity in oxygen distribution along the layer. At…
Planar organic heterostructures have been prepared using poly-N-epoxypropylcarbazole fi lms and poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] by the method of successive deposition adding 2,3,9,10,16,17,23,24-zinc octabutylphthalocyanine. Photoelectric, photodielectric and photovoltaic properties of the h…
The paper reports on electron transport properties of tungsten disulphide doped with rhenium: WS2, W0.95Re0.05S2, W0.90Re0.10S2and W0.85Re0.15S2. Polycrystalline powders of the compositions were synthesized by direct high temperature reactions of elements with stoichiometric rations. Experimental samples were formed o…
Some unexplained outages of overhead transmission line occur due to flashover of dirty and moistening insulator string in early morning time. The processes of a surface insulator wetting are discussed in this paper as the cause of insulation flashover. The explanation is given for the fact that the most frequent outag…
Purpose: Atrial fibrillation is the most common arrhythmia in adults. Current therapies are hampered by high recurrence rates. We investigated a stent-based contactless energy transfer to isolate pulmonary veins in pigs. Methods: Nitinol self-expanding implants were positioned in the pulmonary veins of pigs. Using ele…
Composite ceramics TiN/Ti5Si3is of a great interest due to its high hardness, fracture toughness, electrical conductivity and uniquely high resistance to erosion and oxidation up to 800 Celcius degree. The main problem is connected with the synthesis of necessary raw materials for ceramics sintering. Earlier it was sh…
This study describes the synthesis of some novel compounds containing bis-1,3,4-oxadiazole bearing quaternary ammonium salt moieties. The target compounds were prepared from 2-(dimethylamino)ethyl methacrylate (DMAEMA) or 2-(diethylamino) ethyl methacrylate (DEAEMA), using adipic acid as starting material. All the new…
The changes of electric characteristics of induction crucible furnace in early period of melting the charge have been studied by using computer simulating. As a result the characteristics of active power in the charge, power factor, and electrical efficiency and other versus temperature and size of charge are represen…