Materials Literature
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Uniaxial elongational viscosity of low density polyethylene (LDPE) gave the strain-hardening property. However, talc-filled LDPE showed almost no strain-hardening property and glass-fiber-filled LDPE exhibited the strain-softening property. The cause of almost no strain-hardening property or strain-softening property…
The effect of stress ratio (R=σmin/σmsx) on subsurface fatigue crack initiation behavior in high-cycle fatigue of beta-type titanium alloy, Ti-15V-3Cr-3Sn-3Al, was investigated using smooth specimen subjected to axial reversed loading in air at room temperature. Two types of microstructure prepared using different agi…
In acid media, the corrosion inhibition offered by ethanol amines, benzoic acids, acetylinic alcohols for iron and nickel was investigated. These molecules absorbed on the metal surface and offered inhibition. A correlation between inhibition and electronic configuration of the molecules was attempted. In benzoic acid…
Despite the progress made in imaging modalities based on nonionizing radiation such as ultrasound and magnetic resonance imaging, X-ray is still the primary imaging method in most radiology departments. In recent years, digital electronics and manufacturing methods have led to many approaches for the design and constr…
The 3D leakage magnetic field in a transformer is calculated by using the surface impedance method based on two scalar magnetic potentials. The leakage magnetic flux density and the highest temperature rise of the tie plate calculated are compared with the measured values, and the results are satisfied for engineering…
Ferroelectric behavior was investigated for aliphatic odd polyamides, nylon 77, nylon 79, nylon 97, and nylon 99, that were prepared by polycondensation of heptamethylenediamine and nonamethylenediamine with heptan-1,7-dioic acid and nonan-1,9-dioic acid. Polyamides obtained were melt-pressed into films, followed by t…
ZnAl 2 S 4 single crystals with spinel (α-phase) and wurtzite (w-phase) structures have been studied by Raman spectroscopy under hydrostatic pressures of up to 300 kbar. Significant changes in the phonon spectrum of the α-phase have been observed at the critical pressure of 230 kbar, which are attributed to a reversib…
The effect of fiber waviness, which develops during the processing and manufacture of fiber-reinforced composite structures, on compressive failure was investigated. Analytical and experimental evidence has shown that out-of-plane waviness (also referred to as layer or ply waviness) is a major contributing factor in c…
The strength and toughness of a newly developed 0.8C-8Cr cold work tool steel whose composition was controlled to suppress the precipitation of massive eutectic M7C3 carbides were investigated with reference to microstructure and were compared with conventional SKD11. The toughness was evaluated by the area under the…
Enthalpies of solution for N-methylpropionamide and 2-pyrrolidone in water, propan-1-ol, acetone and toluene were measured by calorimetry. Heats of vaporization were determined for the amides by ebulliometry, and enthalpies of solvation from gas phase were obtained. Enthalpies of solvation were the same for the two ne…
The surface contribution to the interfacial chemistry involved in the preparation of potassium-modified metal oxide catalysts has been revealed by examining industrial 5 wt.% K+ silica–alumina versus silica and previously examined alumina. The investigation was conducted by means of potassium and nitrogen adsorption m…
The bis-sulfur-bridged copper(II) dimer [{CuL(HL)Cl}2] (HL = N-ferrocenecarbonyl-N′,N′-dimethylthiourea) has been synthesized and structurally characterized. The central copper(II) ion has a distorted tetrahedral environment with one chloride and three sulfur atoms derived from one terminal and two bridging acylthiour…
Recent work has demonstrated that the red carotenoid bixin is easily extracted from Bixa orellana seeds by particle attrition and impact rather than by solvent extraction. This technique may require a previous step for drying seeds at a safe temperature to preserve pigment quality. A spouted bed (SB) with a draft tube…
A variable-pressure scanning electron microscope (VP-SEM) equipped with a high-sensitive backscattered electron (BSE) detector of the YAG type was applied to studies of biological tissue samples. The rat kidney and trachea were fixed, dehydrated in ethanol, critical point-dried and examined in the VP-SEM under a speci…
The alkali-metal iron silicate, CsFeSiO4, has been synthesised, using a gel decomposition method followed by high temperature annealing, and shown to adopt the zeolite ABW structure constructed from alternating FeO4 and SiO4 tetrahedra surrounding caesium.
This paper describes surface grafting of hyperbranched dendritic polyamidoamine, a new class of topological macromolecules, onto glass fiber for modification of the glass fiber surface. Glass fiber having surface amino groups as initiator sites was prepared by treatment of the glass fiber with 3-aminopropyltriethoxysi…
Brownian dynamics simulations have been carried out on a binary colloidal mixture of particles of two different diameters interacting via a Derjaguin-Landau-Verway-Overbeek potential. As the screening length is increased a transition from liquid to crystal (at a volume fraction $\ensuremath{\varphi}=0.2$) or a glassy…
In typical polymerizations of propene, the stereochemical structures of the resulting polymer depend on the replication probability (for meso placements) in two ways. Decrease in this probability decreases the overall isotactic content, but also decreases the average lengths of the isotactic sequences. New catalysts,…
The author looks back over a scientific career of almost 50 years spent mainly in research on liquid crystals (LCs) and carried out largely in University service and latterly for about five years in Industry. In this review, the development through its rapid escalation starting in the early 1970s and stemming from the…
A new method evaluating the fibril width and length of disintegrated bacterial cellulose was developed using optical and rheological analysis. During the early stages of the disintegration process, the bacterial cellulose particles formed loose fibrous aggregates, followed by cutting of the disintegrated fibrils that…