Materials Literature
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Er-doped SiO 2 and Si nano-crystals (NCs) embedded in a SiO 2 matrix were produced by ion beam implantation of Si (100) substrates. After annealing Er ions agglomerate in different positions with different compositional properties in samples with and without Si implants. HAADF and EELS show that in the sample with Si…
The cationic networks in the structure of binary and mixed-anion compounds forming in the Ln 2 O 3 -B 2 O 3 -GeO 2 systems have been studied. The collection of the known cationic networks consisting of two dominating pure forms, anisotropic and isotropic, as well as of the combined anisotropic-isotropic and multivecto…
In this study, we present a numerical design approach, based on a vibrating search algorithm, to design a very low-loss normal-incidence broadband visible (vis) or near-infrared (NIR) antireflection (AR) coating. The vibrating search method involves the vibration adjustment and vibration-eliminating operations, which…
Component interactions in the CsBr—Cs 2 ZnBr 4 —Cs 2 CdBr 4 —Cs 2 HgBr 4 system were studied using differential thermal analysis (DTA) and powder X-ra y diffraction. The system is characterized by a continuous solid solution series. New compounds have not been found.
The technique for kinetic examination of polycondensation of silicon alkoxides, which allows determining the rate of reaction between ammonium molybdate and various associates of silica for systems in which hydrolysis proceeds, was modified to examine similar systems after the gel point. Aging of freshly prepared tetr…
Lecoqite-(Y), ideally Na 3 Y(CO 3 ) 3 ·6H 2 O, a new mineral species, was discovered at the Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada. It is associated with microcline, albite, natrolite, gonnardite, aegirine, siderite, elpidite, gaidonnayite, zircon, franconite, dawsonite, rhodochrosite, cryolite, rutile,…
Opto-electronics is one of the largest and fastest evolving market segments, with revenues expected to surpass $1.2 trillion by 2017 (Optoelectronics Industry, 2007). Continuous improvements in the size, detection limit, reliability and spectral sensitivity of existing solidstate light sensors and image detectors, whi…
The study is focused on formation and optical properties of nanostructures induced by laser radiation on the surface of Si1-xGe(x)/Si hetero-structures. Formation of self-assembling nanohills induced by irradiation of nanosecond Nd:YAG laser pulses on the Si0.7Ge0.3/Si hetero-epitaxial structures is reported. The atom…
There are many ways to identify fibres; however, since most of the tests are destructive or the sample preparation process is complex, most methods used to identify archaeological fibres have their limitations. Among the existing methods, Fourier Transform Attenuated Total Reflection Infrared (ATR-FTIR) technology is…
In the present study, the set of the directionally solidified samples from alloy with the nominal composition Co 38 Ni 33 Al 29 were prepared using the Bridgman and the floating zone method. Various growth rates results in various solidification structures, mainly different ratio of the disordered phase γ-cobalt solid…
Three structurally different types of small peptides, namely, i) Boc-Ile-Aib-Ile-OMe (Aib=alpha-aminoisobutyric acid), ii) Boc-Xx-m-aminobenzoic acid (Xx=beta-Ala and gamma-aminobutyric acid), and iii) Boc-Xx-m-nitroaniline, were found to exhibit beta-sheet-mediated fibrillogenesis in the solid state, revealed by FT-I…
Films of tin-doped indium oxide (ITO) were prepared on silicon and soda lime glass substrates at different temperatures during sputtering. Stresses in the ITO films were measured during a uniform thermal annealing cycle in nitrogen atmosphere. A larger compressive residual stress arose in the ITO film when the substra…
The sorption of caffeine and theophylline from water solutions on hypercrosslinked polystyrene MN-200 was studied. It is shown that sorption is described by the Langmuir equation. The conditions of the dynamic sorption concentration of caffeine and theophylline on a concentrating column and the conditions of its desor…
The effect of an oxygen excess δ on the magnetic and electrical properties of La1−x Ca x MnO3+δ (x=0.10–0.15) has been studied over wide ranges of temperatures and magnetic fields. As δ increases, the magnetic ordering temperature Tcdecreases by 70–90 K, the magnetoresistance increases (the electrical resistivity decr…
A method for calculating the contact pressure in durable rivet bonds under the action of the force of the rivet and as a result of unloading is presented. A formula determining the radius of the plastic zone in sheets is developed. The phenomenon of reverse plastic deformations in a shank is described. The values of t…
Approaches for the development of anisotropic electroconducting composite materials based on polyaniline and Na-montmorillonite prepared by the me thods of boundary and intercalation polymerization of aniline and mechanical blending are proposed. Parallel plane compression of solid and plasticized dispersions is shown…
Nanocrystalline SrAl2Si2O8 :Eu2+ phosphor layers were coated on nonaggregated, monodisperse and spherical SiO2 particles using a hydrothermal homogeneous precipitation. After annealing at 1100 °C, core-shell SiO2@SrAl2Si2O8 :Eu2+ particles were obtained. They were characterized with x-ray diffraction (XRD), scanning e…
Background: Chemotherapy can induce severe side ef ects in patients due to nonselective activity towards healthy cells during the treatment of cancer. h is can lead to an alteration of the dosage regimen and in some cases to premature cancelation of chemotherapy, which reduces its therapeutic ef ect and prolongs the t…
We theoretically have been investigating the basic adsorption properties of BF 4 - anions on graphene as the first step in researching the properties of carbon nanotube (CNT) electrodes in an electric double layer capacitor. To clarify the basic adsorption properties, we used the first principles calculation based on…
This paper presents results of magnetic characteristic analysis of a three-phase generator utilizing grain-oriented silicon steel sheets. In the analysis, the finite element method taking account of the two-dimensional magnetic properties is used to make clear rotational iron loss distributions. In this paper, the kno…