Materials Literature
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Dielectric relaxation studies of alkyl methacrylate (methyl methacrylate, ethyl methacrylate and butyl methacrylate) mixtures with phenol derivatives (p-cresol, p-chlorophenol and 2,4-dichlorophenol) have been carried out using a time domain reflectometry (TDR) technique in the frequency range 10MHzto 20 GHz at 293 K.…
In modern nanotechnology analysis such methods are needed which are able to investigate extremely small volumes, thus surface sensitive techniques with a high spatial and depth resolution. Concerning the capability of high lateral and depth resolution, Auger electron spectroscopy (AES) is one of the outstanding analyt…
In this paper, the sol-gel synthesis and characteristic properties of kalsilite-type alumosilicates (KAlSiO4 and K0.5Na0.5AlSiO4) are reported. The polycrystalline powders were characterized by thermal analysis (TG/DTA), powder X-ray diffraction analysis (XRD), IR spectroscopy and scanning electron microscopy (SEM). S…
Novel heat sink materials reinforced with diamonds have been produced via powder metallurgy. As matrix, several copper alloys containing boron have been chosen. Prepared composites have been investigated regarding microstructure and the various properties such as thermal conductivity, thermal expansion, etc. Light and…
A tensile stress developed in polycrystalline copper films during room-temperature aging was computed using a diffusion equation for excess vacancies migrating to the grain boundaries. This theory is based on an assumption that a free volume created by the arrival of excess vacancies at the grain boundaries of thin co…
Fabrication of anodic aluminum oxide (AAO) on 4 in. glass substrate was demonstrated. Using unique structure with quadruple contacts as electrode support during anodization, we reported gradual transformation from opaque aluminum to transparent AAO over the entire substrate. In contrast, partial transformation was obs…
Magnetic properties were investigated for the alternately deposited film of C60 and Co which has found to exhibit tunnel magnetoresistance (MR) of 10–80%. Magnetic field and temperature dependences of magnetization showed typical superparamagnetic behaviors with the blocking temperature of 40 K. The magnetization curv…
A comparison of the effects of ultrasound produced by low- and high-frequency ultrasonic apparatuses upon biological systems is one of the basic problems when studying ultrasound cavitation effects. One possibility for how to compare these effects is the indirect method which uses well-known physical quantities charac…
The impact of power network changes on one ageing mechanism in one simple insulation system is considered. The effects of non-power frequency events on electrical treeing in epoxy resins are critically reviewed. These non-power frequency events include 3rd, 5thand 7thodd harmonics and various impulses superposed upon…
The H(2)F(3)(-) anion in mononuclear [Cu(dpd)(2)][(H(2)F(3))(2)] (dpd = di-2-pyridyl-methanediol) exists as a HF(2)(-)/HF adduct as evidenced by infrared spectroscopy and X-ray crystallography.
The solid solution of barium titanate (BaTiO3) and sodium niobate (NaNbO3) -- Ba1−x Na x Ti1−x Nb x O3 (BNTN) is a new lead-free material. BNTN ceramics obtained by the conventional ceramic method possess the classical ferroelectric behaviour when 0<x<0.075 and 0.55<x<1 and relaxor behaviour when 0.075 ≤ x ≤ 0.55 1 Kh…
This paper presents simulations of initial velocity distribution of fragments for non-trivial shapes of casing in exploding shells, using a semi-empirical computational model. The key to the proposed approach is the use of transformation of a general geometrical shape to a hollow sphere followed by an application of G…
A practical and step-efficient synthesis of a novel homologous series of G1–G5 dendronized macromonomers and their G1–G4 polymers is described. All dendronized polymers have tert-butyl-protected carboxylic acid functions at the dendrons peripheries and are thus ideal candidates for subsequent “surface” engineering. In…
This paper discusses the possibility of iron loss reduction in non-oriented electrical steel (NO) sheets with a composition corresponding to JIS grade 35A210, and estimates the optimum iron loss from experimental data. The hysteresis loss of processed pure NO steel was decreased by 0.27 W/kg from the present 35A210 st…
Ultrasound was irradiated to an aqueous solution of KI for oxidizing iodide ions in a rectangular-channel type sonoreactor with 14 oscillators mounted in series. The ultrasonic frequency was 133.2 kHz. For different setting conditions with or without a reflector, the reaction was carried out in a batch and continuous…
This paper has investigated the basic characteristics of switching surges in a gas-insulated substation and induced surges to a control cable based on EMTP simulations. It has been found that a switching surge voltage on the core conductor of a gas-insulated bus (GIB) tends to increase and the oscillating frequency be…
To provide engineering data useful in design, manufacture and operation of hydrogen storage vessels in hydrogen refueling stations, fatigue test machine equipped with high-pressure hydrogen autoclave was introduced. The effect of steel’s strength level, temperature effect, fracture toughness and pressure effect were e…
Interaction of Pd-clusters [Pd(CO)(OCOR)](n) with NO was investigated, these Pd-clusters were found to promote the NO disproportionation into N(2) and NO(2)(-) in mild conditions; an eight-nuclear palladium cluster Pd(8)(micro-CO)(4)(micro-OOCCMe(3))(8)(micro-NO(2))(4) with a new type of structure and an uncommon set…
In order to study the low-temperature phase transition in CaCd6, which is attributed to a reordering of the innermost tetrahedral cluster shells, accurate Embedded-Atom-Method potentials are developed for this system. With these potentials, the ideal cluster structure and the couplings between neighbouring clusters ar…
In order to assess the structural integrity of a reactor pressure vessel (RPV), it is assumed that a surface crack resides through the cladding at the inner surface of the vessel. It is, therefore, important to precisely evaluate stress intensity factor (SIF) under the residual stress field due to weld overlay claddin…