Materials Literature
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The result of the calculations of the electronic structure for Ba8Zn x Ge46 − x (x = 4, 6, 8) clathrates are presented. Band structures, total and partial electron densities of states in clathrates were obtained. The effect of the number of substituted atoms on the electron energy spectrum was considered. The lineariz…
The thin films of zinc oxide have been produced by the pulse laser deposition method at various levels of gallium and nitrogen doping. To obtain the n -type films we used gallium doping with concentration of gallium from zero up to 5 at %. The dependence of photoluminescence of the epitaxial ZnO:Ga films on the concen…
Stigmata are common features in the genusGomphonema and many species have one or several of them. But in contrast to many other genera, e.g. Cymbella, they are very simple constructions. In general they consist of a porus with a roundish external and a roundish to slit-like internal opening. More complex structures ar…
We present a method for removing spectrometer specific contributions to x-ray photoelectron spectroscopy data. We consider the degree of linearity of the detection system, the strength of the internal analyzer inelastic background, and finally determine the spectrometer's transmission function. The procedures presente…
A modified polyimide has been created that both senses and absorbs moisture. The material was prepared by introducing cobalt(II) chloride, a well-known moisture sensing and absorbing metal salt, into a polyimide. The final polymer was found to be fully cured, retaining the metal without any leeching, and was thermally…
To address the issue of miscible viscous fingering instability in buoyancy free conditions, experiments have been performed under microgravity conditions in parabolic flights. A Hele-Shaw cell, two parallel plates separated by a small gap, has been used with two miscible fluids of viscosity ratio 100 (the injected flu…
Colloidal tetrapod-shaped CdTe/CdS nanoheterostructures with near-IR photoluminescence (PL) up to 830 nm were synthesized and evolution of absorption and PL spectra during shell growth was studied.
The authentication and identification of the source of a printed document(s) can be important in forensic investigations involving a wide range of fraudulent materials, including counterfeit currency, travel and identity documents, business and personal checks, money orders, prescription labels, travelers checks, medi…
Magnetic annealing can reorient the domain moments, improving dramatically the magnetostriction of Tb–Dy–Fe oriented polycrystals without applying any prestress. In this paper, totally different stress dependences of magnetization and magnetostriction were observed in ⟨110⟩ oriented Tb0.36Dy0.64(Fe0.85Co0.15)2 polycry…
Abstract The thermoplastics processing of native starch in the presence of water is a recent development with very wide possible applications. Eventually, oil‐based polymer materials have to be replaced in many applications by sustainable, inexpensive, natural materials from renewable resources. The present contributi…
Polymeric insulation materials are widely used in power generation and energy storage apparatuses. Several examples are: dielectric films for capacitors and resistors; encapsulations for electronic components and devices; insulations for power cables and electrical machines. The dielectric breakdown behaviors of these…
The progression of hypothetical core disruptive accidents in metallic fuel fast breeder reactors is strongly affected by the fragmentation of molten metallic fuels due to the molten fuel-coolant interaction (FCI). As a basic study of FCI, the present paper focuses on the fragmentation of a single molten copper droplet…
The electronic structure of graphite is studied using the generalized tight-binding approximation. We investigate how the energy spectra around the Fermi energy of graphite depend on interlayer stacking arrangement. We find that graphite and bilayer graphene with rotational stacking arrangement are metals with a massl…
Laser-induced luminescence of OH s groups for undoped Al 2 O 3 oxides of various phase compositions was excited by pulsed nitrogen laser radiation at 337.1 nm. The luminescence band at 500–650 nm assigned to hydroxide groups of Al 2 O 3 , actually, consists of several lines at 500–515, 553, 567, 577, 607, and 633 nm;…
Transparent nanoglassceramics has been synthesized based on lead fluoride silicate glass doped with erbium ions. It is shown that heat treatment of lead fluoride silicate glass leads to the formation of nanoscale (16–40 nm) crystalline phase of lead fluoride. X-ray diffraction analysis and measurement of spectral lumi…
The structural and electronic properties of Ti in the SrTiO 3 /GaAs(001) interface are studied using the density functional theory. In all the structures examined, the formation energy of Ti on GaAs(001) decreases with decreasing Ti coverage. Sr or Ti adsorption atoms at the fourfold hollow sites with 1/4 monolayer co…
The stability, optimized structure, and electronic gap of four diamondoid complexes, adamantane, C(10)H(16), diamantane, C(14)H(20), triamantane, C(18)H(24) and the T(d)-symmetry isomer of pentamantane, C(26)H(32), incorporating cage-centered small atoms and ions (X@cage, where X = H(+), Li(0,+), Be(0,+,2+), Na(0,+),…
Samples of polycrystalline nickel of high (99.9945%) and commercial (99.5%) purity were studied in a series of planar impact experiments with initial, preshot, sample temperature ranging from 150 to 1150 K. The free surface velocity of the impacted sample was monitored by velocity interferometer. On the base of the re…
The equilibrium and microscopic properties of systems of discotic molecules have been investigated with Monte Carlo (MC) simulations. The study focuses on the behaviour of the fluid in the isotropic phase in the vicinity of the first liquid crystal transition, which involves either a nematic or a columnar phase. The m…
Basing on scale invariance of considered system an improvement of the Bertotti formula for energy loss in soft magnetic materials has been achieved. Assumptions of the Bertotti theory were discussed and criticized. As an alternative to this theory a new approach basing on the scale invariance of complex systems has be…