Materials Literature
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Freeform lenses can be designed for diverse illumination profiles with good uniformity. However, most of the previous studies formulated for a single point source and the lens to design has a spherical bottom. In this study, the formulation is extended for multiple point sources and for lenses with a flat bottom in fa…
We have synthesized Li0.5−yNayLa0.5Nb2O6and Li0.5−yNayLa0.5Ta2O6defect perovskite solid solutions with 0 < y ≤ 0.5. Lithium ion diffusion in the investigated system exhibits no percolation effect. In the Li0.5−yNayLa0.5Nb2O6system, the ionic conductivity as a function of sodium content has a maximum due to two competi…
It has been found that metal nanopowders produced by wire electrical explosion have stored energy, which is higher than the standard heat of melting. Continuing studies on stored energy the influence of electrons flow (accelerator ELU-4) on iron and nickel nanopowders has been investigated in the paper. It was found t…
Studies of sheet glass strength during bending tests and microstrength determined at contact with a sphere are performed. Measurements are carried out on glass with different surface conditions. It is established that the microstrength of glass with surface defects (under initial conditions or upon imparting a network…
The investigation of the relation between the form of the hybrid electromagnetic-spin-wave spectrum of the hexaferrite film and the mutual orientation of the anisotropy axis and the external bias magnetic field is presented. The investigation covers the solution of both static and dynamic problems. The obtained spectr…
Recently, many lead-free piezoelectric materials have been investigated for the replacement of existing Pb-based piezoelectric ceramics because of globally increasing environmental interest. There has been remarkable improvement in piezoelectric properties of some lead-free ceramics such as (Bi, Na) Ti03-(Bi, K) Ti03-…
Scale model experiment is an important way to study the lightning shielding performance and calculation method of UHV transmission line. In order to improve the calculation method and analyze the influence factors about lightning shielding performance of UHV transmission line, a new electrode is proposed to solve the…
Nanocrystalline titanium-manganese mixed oxides (TMMO) with Mn content of 13–16 at. % were first synthesized by manganese hydroxide precipitation on anatase or rutile particles. UV-vis absorption spectra were investigated in 2.4–6.0 eV region and revealed that compared with pure TiO2the presence of manganese oxides re…
Using Zn nanowires as a self-sacrificed template, hierarchical tubes constructed by zinc oxide (ZnO) nanoflakes and ZnO nanotubes have been successfully fabricated by two different thermal-oxidation modes. The products were characterized by the X-ray powder diffraction, transmission electron microscopy and field-emiss…
We study the behavior of rotation of polarization plane when passing from positive to negative dielectric and magnetic susceptibilities of a gyrotropic medium for two formulations of material equations in such media.
We present here results of spectral (UV-Vis, PL), morphological (XRD, SEM) and voltammetric (I-V) characterizations of electrochemically deposited nanostructured ZnO layers at transparent ITO electrodes. For the first time the deposition was run in a presence of tetraalkylam-monium hydroxides (TAAHs) as organic templa…
Accurate models for clusters of interacting bubbles are sought for both biomedical and underwater applications. Multiple bubble models have been developed by treating the bubbles as a system of interacting oscillators. The models are obtained initially for bubbles in an incompressible, irrotational, and inviscid liqui…
The molecular structure of 1-phenyl-2-nitroguanidine is nonplanar, but contains two almost planar fragments: nitroguanyl and phenyl groups. Unlike previously studied nitroguanidines, in 1-phenyl-2-nitroguanidine, the nitro group is turned to the secondary amino group. However, the structural parameters of the nitrogua…
This work presents investigations conducted in the field of preparation of a hybrid nanocomposite composed of the vertically aligned ZnO nanorod arrays coated with the layered precursor of TiO2(LPT). Effects of the elevated temperature on the structure and morphology evolution of the ZnO nanorod array and their hybrid…
This article studies aluminum alloy plate through 16 to 3mm thick with a hole under room temperature fracture test. The experimental results show: the initial macroscopic crack initiation at the notch of the center of the surface, along the thickness direction through, then along the width direction of expanded rapidl…
AgCl microparticle materials, with novel heart-like morphology, were successfully prepared by means of a simple solution phase route, in which a small amount of hydrochloric acid, ethylene and PVP were introduced to the conventional polyol process. The obtained microparticle materials were characterized by scanning el…
We report the geometrical effect of graded buckled multiwalled carbon nanotube arrays on the electrical transport properties in the diffusive regime, via successive breakdown caused by the Joule heating. This breakdown occurs in the straighter region. Empirical relations involving the current-carrying ability, resista…
The work deals with the study of the phase and structural behaviour of the rare-earth substituted BiFeO3. X-ray powder diffraction examinations revealed that the polar R3c phase in the Bi1−xRExFeO3systems with RE = Er, Tm and Yb do not exceed 7, 4 and 3 mol.% of rare earth, respectively. Partial substitution of Er and…
An updated software package for the simulation of point diffraction pictures and the computation of several crystallographic characteristics of martensite crystals in alloys with the shape-memory effect is presented. Optimization was carried out for the procedure of the analysis of the orientation relationships betwee…
It is known, that the presence of oxide films and nonmetallic inclusions on a high-voltage electrode surface considerably reduce a vacuum gap electric strength. One of this phenomenon causes is electric charge occurrence in them, which one increases an external electric field strength. The charged particles postemissi…