Materials Literature
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The effects of extracts of the aerial part of Blumea riparia DC. and their phenolic acids on hemostasis were evaluated. The EtOAc fraction showed significantly reduced blood clotting time (CT) and tail bleeding time of transection (BT) of mice in vivo. This fraction contained vanillic acid (1), syringic acid (2), p-co…
The paper presents a comprehensive numerical analysis of x-ray and neutron scattering from finite-conducting rough surfaces which is performed in the frame of the boundary integral equation method in a rigorous formulation for high ratios of characteristic dimension to wavelength. The single integral equation obtained…
The objective of this paper is to investigate the predictability of air permeability of cotton woven fabrics from their construction variables by using a feed-forward back-propagation network in an artificial neural network (ANN) system. In order to achieve this objective, a number of grey cotton fabrics meant for shi…
The mechanism of the chemiluminescent condensation of aniline with butyraldehyde into 3-ethyl-2-propylquinoline catalyzed by LnCl3 · 6H2O (Ln = Tb, Ho) is reported. A likely scheme of the catalytic condensation of aniline with butyraldehyde has been developed by simulation of separate steps of the reaction using chemi…
Differential-scanning calorimetry in the dynamic mode was used to study the curing kinetics of a PDI-3AK macromolecular oligodieneurethane-epoxy oligomer with isomethyltetrahydrophthalic anhydride in the presence of a number of catalysts, modifiers, and fillers. The effect of their chemical nature on physicomechanical…
Zinc-oxide-based ceramics were prepared by uniaxial hot pressing and their optical properties and luminescence-scintillation characteristics (for X-ray and gamma excitation) have been studied. The ceramics exhibit 35% transmission in the region of maximum wavelength of X-ray-induced luminescence (520 nm); an absolute…
Space borne observation requires extremely high resolution systems with large dimensions. The design of such systems implies associating sensing and actuation systems to insure a highly stable positioning of optical components. However, the currently used PZT materials for piezoelectric actuation show strongly diminis…
Abstract Iodine(III) chloride and free base para‐substituted meso‐tetraarylporphyrins (H 2 t(4‐Xp)p, X = OCH 3 , CH 3 ,CH(CH) 3 , H, Cl) react at mild conditions for formation of [(ICl 3 )H 2 t(4‐Xp)p] molecular complexes. The very close correspondence between the UV‐VIS and ( 1 H, 13 C) NMR spectra of these complexes…
Abstract Atomic distribution, thermodynamic stability of solid solutions and properties of dislocations in steels are discussed in terms of the effect of carbon, nitrogen and hydrogen on the electronic structure of iron. It is shown that nitrogen and hydrogen increase the density of electron states at the Fermi level,…
The conformation and arrangement of poly(ethylene oxide) (PEO) chains in clay galleries is still controversial. In our work, various spectroscopic methods have been used to explore the conformation of PEO in clay galleries. The melt intercalation process is investigated using variable-temperature Raman spectroscopy. I…
High-quality ceramics were synthesized on the basis of Bi1 − x A x FeO3 (A = La, Nd; 0.00 ≤ x ≤ 0.20) solid solutions. Their crystal and grain structure, Mössbauer spectra, and other dielectric and magnetic characteristics were studied. It was shown that an increase in the content of A elements in the studied samples…
Abstract Thiol‐functionalized meso‐structured silicas have been prepared by the co‐condensation of tetraethoxysilane and 3‐mercaptopropyltrimethoxysilane in the presence of an amphiphilic block copolymer (EO) 45 ‐ b ‐(MA) 53 . Partial S‐alkylation of mercapto groups with 9‐(chloromethyl)anthracene resulted in the form…
Abstract The crystal structure of Gd(CO 3 )OH was solved using synchrotron powder X‐ray diffraction. Gd(CO 3 )OH was known to exist in a form Gd 2 O(CO 3 ) 2 ·H 2 O and its powder pattern has been listed in JCPDF (#430604) for decades, but the crystal structure has not yet been elucidated. The crystal structure is sol…
The 3D problem of scattering by a grating consisting of coaxial impedance bodies of revolution is solved with the help of the modified null field method. A system of integral equations is derived, and numerical results are obtained for the scalar and vector formulations of the problem.
Small calibre (〈6mm) polytetrafluoroethylene (PTFE) bypass grafts have poor medium and long term patency due to the development of neointimal hyperplasia at the distal anastomosis. The inelasticity of PTFE is implicated in this mechanism of failure. We have developed a novel polyhedral oligomeric silsesquioxane (POSS)…
This paper puts forward and discusses the prospects of carbon based nanomaterials (including carbon nanotubes and graphene nano-ribbons) for designing next generation low-power, low-loss and ultra energy-efficient “green” electronics targeted for computing as well as energy storage and conversion applications.
Ion implantation technique is used to study the magnetic properties of Cu-doped ZnO. The room temperature ferromagnetism in the Cu-implanted ZnO samples is observed. From the photoluminescence spectrum of implanted samples we observe a broad green emission around 510 nm, which is related to defects in the samples. X-r…
In thin-film silicon solar cells, a flexible optical design for light collection is developed that can lead to zero reflection loss and enhance the optical path length in the absorber layer. In this work, we demonstrate two-filling-factor asymmetric binary gratings on the top of the solar cells and metallic diffractio…
The influence of the temperature of the primary heat treatment in the case of two-stage heat treatment of glasses on the kinetics of precipitation of PbS nanocrystals and the structure of the glass-ceramic materials prepared has been investigated. The main structural parameters of the glass-ceramic material, such as t…
Abstract Glycerol is a byproduct of biodiesel synthesis by transesterification of triglycerides with short-chain alcohols in the presence of solid base catalysts. Because hydrotalcite is a potentially useful basic catalyst for the transesterification reaction, the interaction of glycerol with hydrotalcite is the focus…