Materials Literature
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Natural connection between Gelfond-Leontyev generalized derivation operators (GDO) and Brenke polynomials is established. Operator extension criterion commuting with GDO up to continuous H(G) space is derived. Domain class when characteristic function of the complex convolution operator always has zero type, is descri…
The scientifically based algorithm of process and equipment of hairpins with thin-walled details characterization is considered. The results of the chosen and calculated parameters of process and equipment are presented.
We address the heat flow study starting from microscopic models of matter: we develop an approach and investigate some anharmonic graded mass crystals, with weak interparticle interactions. We calculate the thermal conductivity, and show the existence of rectification and negative differential thermal resistance. Our…
Peripheral nerve injuries can lead to lifetime loss of function and permanent disfigurement. Different methods, such as conventional allograft procedures and use of biologic tubes present problems when used for damaged peripheral nerve reconstruction. Designed scaffolds comprised of natural and synthetic materials are…
Accelerated aging tests have been extensively used on motor and generator insulation systems to simulate in a short time period the deterioration mechanisms occurring during normal operation of many years, to identify insulation system designs with longer life time and to support the qualification of a new system. The…
Dense nanograined pure and Mn-doped Zn1−xMnxO polycrystals with x ranging between 0.1–34 at. % were synthesized by the wet chemistry method from butanoate precursors. Pure and Mn-doped ZnO possesses ferromagnetic properties only if the ratio of grain boundary (GB) area to grain volume sGB exceeds a certain threshold v…
The temperature dependency of the crystal structure and the polymorphic transition of CaCO{sub 3} from aragonite to calcite were studied using Rietveld structure refinement and high-temperature in situ synchrotron powder X-ray-diffraction data at ambient pressure, P. The orthorhombic metastable aragonite at room P, sp…
In this study, we attempt to experimentally address the question of whether p, p ′-dimercaptoazobisbenzene (DMAB) can be produced from p -aminothiophenol (PATP) by surface photochemistry reaction in the junctions of a Ag nanoparticle−molecule−Ag (or Au) film. First, utilizing surface-enhanced Raman scattering (SERS) s…
The multi-needle electrospinning system is a convenient way to produce fibers with special structures such as core-shell morphologies at a high production rate. In this paper, a specially designed multi-needle electrospinning system is presented. The spinnerets were built-up with an equilateral hexagon array. Each set…
The application of green-synthesis principles is one of the most impressive research fields for the production of nanoparticles. Different kinds of biological systems have been used for this purpose. In the present study, AuNPs (gold nanoparticles) were prepared within a short time period using a fresh cell extract of…
We carried out first-principles calculations within density-functional theory to investigate the structural, electronic, and magnetic properties of boron-nitride (BN) honeycomb structure functionalized by adatom adsorption, as well as by the substitution of foreign atoms for B and N atoms. For periodic high-density co…
The van der Waals and Casimir-Polder interaction of different atoms with graphene is investigated using the Dirac model which assumes that the energy of quasiparticles is linear with respect to the momentum. The obtained results for the van der Waals coefficients of hydrogen atoms and molecules and atoms of metastable…
Paramagnetic (PM) properties of columnar cobaltosic oxide (Co3O4) nanoparticles, about 75 nm in diameter, have been investigated by magnetization measurements at T>TN=39 K. In zero or low applied field, the effective PM moment per formula unit (FU), μeff, enhances significantly from the bulk value of 4.14 μB/FU. It de…
Magnetization, ac-susceptibility, and muon spin-relaxation $(\ensuremath{\mu}\text{SR})$ measurements have been performed in neutral phthalocyaninato lanthanide $({[Ln{\text{Pc}}_{2}]}^{0})$ single-molecule magnets in order to determine the low-energy levels structure and to compare the low-frequency spin excitations…
We have investigated the atomically-resolved substrate and homoepitaxial thin film surfaces of SrTiO3(001) using low-temperature scanning tunneling microscopy/scanning tunneling spectroscopy (STS) combined with pulsed laser deposition. It was found that a typical annealing treatment for preparation of SrTiO3 substrate…
Broadband ferromagnetic resonance responses for metallic single-layer and bilayer magnetic films with total thicknesses smaller than the microwave magnetic skin depth have been studied. Two different types of microwave stripline transducers were used to excite and detect magnetization precession: a coplanar waveguide…
For molecules and materials responding to femtosecond-scale optical laser pulses, we predict maximum relative excitation of a Raman-active vibrational mode with period T when the pulse has an FWHM duration of 0.42 T. This result follows from a general analytical model, and is precisely confirmed by detailed density-fu…
Effect of biaxial tensile strains on optical function and band edge transitions of ultra thin epitaxial films was studied using as an example a 13 nm thick SrTiO 3 films deposited on KTaO 3 (100) single-crystal substrates. Optical functions in the 200–1200 nm spectral range were determined by spectroscopic ellipsometr…
A theory of spin relaxation in graphene including intrinsic, Bychkov-Rashba, and ripple spin-orbit coupling is presented. We find from spin relaxation data by Tombros et al. ( Nature , 448 (2007) 571 ) that intrinsic spin-orbit coupling dominates over other contributions with a coupling constant of 3.7 meV. Although i…
Mechanisms of magnetoelectricity in manganese-doped incipient ferroelectrics, Kuzian, R. O., Laguta, V. V., Daré, A.-M., Kondakova, I. V., Marysko, M., Raymond, L., Garmash, E. P., Pavlikov, V. N., Tkach, A., Vilarinho, P. M., Hayn, R.