Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Transformer life management is an essential part of a modern power operation system. The popularity of mineral transformer oil is due to availability and low cost, also an excellent dielectric and cooling medium. The exploitation of petroleum oil is running out of demand and in the near future, oil scarcity exists. To…
Trajectory optimization of spray painting robot for surfaces is studied. Because the current paint deposition rate function is too complicated, the paint deposition rate function on a plane according to the experiment data is provided. The paint thickness function for free-form surfaces is also given. A multi-objectiv…
Geometrical and topological analysis of 884 crystalline structures of organosiloxanes is carried out (TOPOS software package, Cambridge structural database CSD). Fifty-eight topological types of Si n (O,C) m cluster-polymers with Si-O-Si bridging bonds were established for the first time. The largest number of crystal…
A study of the erosion of a number of polymeric and carbon materials used to construct elements of the outer surface of spacecraft upon exposure to oxygen plasma streams with ion energies of 20–30 eV is conducted. It is shown that the relative erosion coefficients (normalized with respect to polyimide) of the studied…
Activated carbon has been prepared from pomegranate peels using phosphoric acid and steam as activating agents. The influence of activation temperature and time on the yield, the pore structure and the adsorption capacities of the prepared activated carbon was investigated The samples were characterized using N2adsorp…
We have studied photoluminescence spectra of nitrogen-vacancy (NV) centers upon their pumping by short-wavelength visible and near-UV radiation. We have shown that NV 0 centers, as distinct from NV − centers have an absorption line in the UV range. Inversion of the zero-phonon line of NV − centers has been shown and i…
The elastic properties of rare-earth cobaltites R BaCo 4 O 7 ( R = Dy, Ho, Er, Y, Lu) have been investigated experimentally. It has been found that the temperature dependences of the Young’s modulus exhibit significant hysteresis and irreversible effects over a wide range (80–280 K) between the structural and magnetic…
Transport properties of armchair graphene nanoribbon junctions with different widths are investigated on the zigzag edges terminated with sulfur atoms. The first-principles calculations based on the non-equilibrium Green's functions together with the density-functional theory show that their characteristics display ob…
The accumulation of deuterium implanted in tungsten is simulated within the framework of kinetic diffusion theory. The influence of the tungsten microstructure (dislocation density and impurity concentration) on the process of deuterium capture and accumulation is considered. It is established that, under the chosen i…
Secondary ion emission from silicon and graphite single crystals bombarded by argon ions with energies E 0 varied from 1 to 10 keV at various angles of incidence α has been studied. The evolution of the energy spectra of C+ and Si+ secondary ions has been traced in which the positions of maxima (E max) shift toward hi…
The effect of mineral and synthetic lubricating oils on the antifriction behavior of specially synthesized ceramics + monocrystal carbon (m-carbon) nanocomposite coatings has been revealed. It was previously found that the use of m-carbon coatings ensured the formation of highly ordered boundary film, which had a high…
Thin films of zirconium oxide (ZrO2) were deposited by DC magnetron sputtering of metallic target of zirconium on to quartz and p-Si (100) substrates at various oxygen partial pressures in the range 2x10-2 - 6x10-2 Pa. The crystallinity, surface morphology and optical absorption of the films were influenced by the oxy…
The dynamics of a non-Newtonian liquid jet emanating from the Taylor cone during electrospinning of a polymer solution has been studied. The viscoelastic properties of the solution are described in terms of the finitely extensible nonlinear elastic FENE-P model. The shape of the jet has been determined, and the curren…
Stimulated Raman scattering (SRS) is discovered under picosecond laser excitation in a YAlO 3 orthorhombic crystal, and its cascaded and cross-cascaded χ (3) nonlinear optical interactions are studied. Investigations revealed three SRS-active phonon modes of the crystal and identified all its recorded Stokes and anti-…
Structural characteristics, vibrational frequencies, and energies of ten isomers of acetylene compounds with the centered aluminum cluster Al 13 and its analogues Al 12 M doped with 3 d transition metal atoms (M = Ti-Ni) in the states of different multiplicity have been calculated by the density functional theory meth…
An improved spectral-domain exponential matrix technique is proposed for investigating on the interaction of a THz wave with planar structures consisting of multilayer graphene sheets and bianisotropic slabs. Hybrid effects of different parameters, such as THz wave incident direction, its frequency and polarization, c…
Thermoelectric (TE) devices have shown promise for on-demand cooling of ICs. However, the additional energy required for cooling remains a challenge for the successful deployment of these devices. This paper presents a closed loop control system that dynamically switches a TE module between Peltier and Seebeck modes d…
Abstract The results of the eddy currents losses calculations with using electrodynamics scaling were presented in this paper. Scaling rules were used for obtain the values of the eddy currents losses. For the calculations Finite Element Method was used. Numerical calculations were verified by measurements and a good…
This paper discusses the dimensional and aberrational design of three-mirror objectives having no intermediate image with a convex second mirror and a concave third mirror. The systems have been investigated, and an example of the design of one of the objectives is presented.
The effect of the irradiation of arrays of annealed and unannealed multiwalled carbon nanotubes (CNTs) by electrons with an energy of 21 MeV and a dose of 2.2 × 10 17 el/cm 2 on their electrical conductivity, thermal electromotive force, and elasticity coefficient is studied. It is established that the irradiation of…