Materials Literature
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The crystal structures of two vanadyl phosphates, Rb(VO 2 )[HPO 4 ] ( a = 7.029(4) Å, b = 9.513(6) Å, c = 18.049(10) Å, sp. gr. Pbca, Z = 8, ρ calcd = 2.910(3) g/cm 3 ) and CsAl(VO)[PO 4 ] 2 (H 2 O) ( a = 8.0128(13) Å, b = 8.0714(13) Å, c = 14.118(2) Å, β = 106.302(2)°, sp. gr. I 2 1 / c , Z = 4, ρ calcd = 3.295(1) g/…
The effectiveness of lubricant modification by highly disperse inorganic polymers is investigated. In this method, a polytitanate-droplet suspension, after dispersion, is introduced in the liquid lubricant.
Free(이산화탄소무배출), Mechanical Properties(기계적성질)초록: 진공침탄법은이산화탄소의발생이없는친환경적인열처리방식으로알려져있다.그러나진공침탄법은탄화수소가스(메탄, 프로판)를노내에직접공급하여열분해하는과정을거침으로써노내에그을음이발생하여안정적인조업이불가능한단점이있다.최근에는이러한단점을극복하기위한불포화탄화수소인아세틸렌가스를이용한진공침탄법이활발히연구되고있다.본논문에서는아세틸렌가스를이용한진공침탄방식의침탄및확산시간을변수로하여여러가지조건에서열처리를진행한후가스침탄열처리된소재와기계적성질을비교분석하여이산화탄소무배출진공침탄열처리방법의활용가능성을확인하였다. 연구결과본…
The distribution pattern of the fine fractions (<1.0 and 1–5 μm) and the mineralogical composition of the agrochernozems formed on the erosional-denudational plains of the Stavropol region have been studied. Erosion and denudation caused the redistribution of the fine material within the catena with its maximal accumu…
We report on the anisotropic electro-optic response of sputtered ZnO films and its dispersion towards both the frequency of the modulating voltage and the wavelength of the probing beam. The observed dispersion put in evidence two mechanisms. A fast and weak electrorefraction response, due to the nonlinear polarizatio…
The results of testing of an E110 alloy in a wide range of strain rates are presented. Ring, tubular, and segmental samples made of a fuel element cladding with sizes of Ø9.1 × 7.73 mm and cylindrical samples made of a bar are tested. The ring, tubular, and segmental samples have the same texture, but they are deforme…
Power distribution and transmission networks widely adopt composite insulators for the overhead power line applications. The premature failure of these insulators due to the high electric field induced in them has become a major disappointment in the recent years. In this paper, an 11kV composite insulator is modelled…
Nitrogen oxides (NOx) from flue gas of industry can be removed efficiently by catalytic technology. However, materials development for selective catalytic reduction of NOx with ammonia (NH3-SCR) is still a challenging task especially at temperature below 200°C. A series of vanadium-ceria oxide supported on mesoporous…
Cryopumping systems provide an essential function in most magnetic confinement nuclear fusion experiments. The maintenance of an ultra-high vacuum in a magnetic confinement vessel is required for experiments to be conducted, without exception, and cryopumping systems are widely used to achieve this. As such, the avail…
The problem of evaluating the impact on the efficiency consequent to the adoption of bonded magnets in substitution of ferrites in small PM machines is faced. Several prototypes produced in the Authors' laboratories have been tested and a long experimental activity has been carried on. In particular the focus of the w…
Abstract Aqueous chemical oxidative polymerization of pyrrole using PdCl2 oxidant was conducted in the presence of cetyltrimethylammonium bromide in order to synthesize polypyrrole–palladium (PPy–Pd) nanocomposite in one step. Interestingly, the PPy–Pd nanocomposite was synthesized with fibrous morphology. Transmissio…
Decomposition reactions of N-dimethylpropyl-2-pyrrolidone (NDPP), which is one of pyrrolidone derivatives (NRPs), by O3 have been examined in aqueous sulfuric acid solutions containing metal ions (Fe(II), Rb(I), Sr(II), Ba(II), La(III), Ce(III), Pr(III), Nd(III), Sm(III), Y(III), Zr(IV), Ru(III), Rh(III), Pd(II), Mo(V…
The non-Newtonian flow of polydisperse polymer melts is shown to be described by a model according to which an increase in the shear rate leads to the suppression of the dissipative losses of the relaxation modes of each fraction. The higher the shear rate, the greater the suppression. The relaxation spectrum of each…
Abstract In the frame of the development of very high temperature die material solutions, two grades of alumina based ceramic fibres with a diameter close to 12 μm have been investigated as reinforcement solutions for an andalusite refractory castable. High temperature mechanical tests were performed up to 1200°C in f…
This paper presents internal failure analysis of transformer windings based on the characteristic of winding impedance in the frequency domain. Two winding samples are selected to test. The simple equivalent circuit of the transformer winding is investigated and proposed. The two windings under test have 76 turns with…
Abstract Brominated poly(isobutylene‐co‐p‐methylstyrene) (BIMS) is of great use to industries because of its extremely good permeability properties. However, it lacks strength and adhesion necessary to make it amenable to various processing techniques. To overcome the limitations of BIMS, ionic modification via nucleo…
In this paper, a theoretical analysis of an axial magnetic coupling is presented, leading to a simple expression of the electromagnetic torque. This expression is obtained by using a two-dimensional (2-D) approximation of the magnetic coupling geometry (mean radius model). The analytical model is based on boundary val…
The effort to simulate the nitriding process has been ongoing for the last 20 years. Most of the work has been done to simulate the nitriding process of pure iron. In the present work, the compound layer growth model has been developed to simulate the nitriding process of AISI 4140 steel. In this paper, the fundamenta…
The band offsets for a Zn 1− x in Mg x in Se/Zn 1− x out Mg x out Se quantum well heterostructure are determined using the model solid theory. The heavy hole exciton binding energies are investigated with various Mg alloy contents. The effect of mismatch between the dielectric constants between the well and the barrie…
This work presents experimental results on the effect of a flow of atomic hydrogen on the quality of vacuum insulation with electrodes made of stainless steel and copper. Electrodes with the class of roughness 1.6, and electrodes, the surface of which previously was polished by means of the electron beam, were tested…