Materials Literature
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The ferrite and austenite stainless steels containing a suitable amount of Cu may be of antibacterial ability after a special antibacterial treatment. The distribution and appearance of the precipitates appeared in the Cu-contained stainless steels were studied with TEM. The results of antibacterial examination show t…
Biopolymers were produced by using Alcaligenes eutrophus microorganisms. Some of substrates such as glucose, sucrose, butyric, pentanoic and propanoic acids used as carbon sources affect the accumulation and composition of biopolymers in the cell. The maximum polymer production (0.97 g/L) was obtained when 2.0 g gluco…
The Forest Products Laboratory uses the cone calorimeter for the initial evaluation of the flammability of untreated and fire retardant treated wood products. The results of various studies are reviewed using a model presented at the 12th Annual BBC Conference on Flame Retardancy. The model uses data from the cone cal…
Abstract Infrared (IR) spectroscopy was used to study the surface (by means of external reflection) and the bulk (by means of transmission measurements on microtomed slices) of specimens obtained by injection moulding of a commercial polyamide‐6 clay‐based nanocomposite material (NCH = nylon clay hybrid) at different…
The potential loss of the C2h symmetry in 7-azaindole dimer caused by the interaction with a polar molecule or environment was examined in a 10−4 M solution of this compound in 2-methylbutane containing 4 × 10−5 M 1-chlorobutane and in pure 1-chlorobutane at a low temperature, respectively, in the light of the proton…
This article describes the design of a yarn spinning model based on the use of artificial neural networks, as well as the measurements aimed at collecting the data necessary for this model. Partial models of the spinning process were designed for selected essential yarn quality parameters, such as tenacity, yarn hairi…
A Rotary-die equal-channel angular pressing (RD-ECAP) process was applied to improve the impact toughness of Al-11 mass%Si eutectic alloy (AC8A). RD-ECAP was effective at improving impact toughness: the impact toughness increased as the number of pressings increased. In addition, the effects of heat treatments on impa…
The effect of hot band grain size on the texture of low silicon steels was investigated. In spite of different hot band grain sizes (22, 125 and 500 μm), the deformation texture is formed by the fibers ‹111›//ND and ‹110›//RD. Nevertheless the recrystallization texture is strongly affected. Increasing the hot band gra…
We have deposited ZnO films on various substrates using the r.f. magnetron sputtering method. X-ray diffraction and scanning electron microscopy coincidentally revealed that the larger grain size and the higher crystallinity were attained when the ZnO films were deposited on sapphire substrates, compared to the films…
Small amounts of silver ions have been found to significantly enhance the growth rate of vanadium pentoxide (V(2)O(5)) nanofibres in aqueous solution at room temperature, yielding fibres with lengths of several micrometers within a few days; the V(2)O(5) fibres are decorated with silver nanoparticles with sizes in the…
Spontaneous symmetry breaking in achiral and racemic materials is reviewed in terms of the so-called banana-shaped liquid crystal materials. Some novel results are reported in the area of conventional liquid crystal phases generated by achiral, bent-shaped molecular architectures where the smectic C phase is seen to c…
Thermal methods of analysis are now used in a very large range of scientific investigations. In this work simultaneous thermogravimetry-differential thermal analysis (TG-DTA), X-Ray powder diffractometry and infrared spectroscopy were used to study the derivative compounds of purine, i. e. aminophylline, theophylline,…
Skin impedance measurements at various skin sites yield different impedance loci for normal skin and special skin sites. The results of skin impedance measurements taken at such sites with a two-electrode measurement system are presented herein. Some of these sites can be identified as acupuncture points. Data from 4…
A 90/spl deg/-angle wedge that is isorefractive to the surrounding medium is considered. Under symmetrical incidence by two plane waves of appropriate amplitude, phase and polarization propagating in opposite directions, the edge of the wedge does not scatter and geometrical optics provides the exact solution to the b…
Biofibers have an outstanding potential as a reinforcement in thermoplastics. Theadvantages of natural fibers over traditional reinforcing materials, such as glass fibers, are lowdensity, relatively high toughness, high strength and stiffness, good thermal properties andbiodegradability. Nature fibers are recyclable a…
This paper reports our recent progress on a microbial system for efficient production of biodegradable copolyester of poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate], P(3HB-co-3HHx), with desirable copolymer compositions using genetically engineered bacteria. We have developed a fermentation technique to achieve…
Ultrafine-grained specimens with the average grain size of less than 2µm and medium-grained specimens were prepared from steel plates produced by an advanced thermo-mechanical control process. The smooth specimens were fatigued under axial tension compression at room temperature in air. The fatigue crack initiation pr…
2-(4-tert-Butylphenyl)-5-(4-ethynylphenyl)-1,3,4-oxadiazole reacts with a series of heteroaryl iodides under standard Sonogashira cross-coupling conditions (Pd[PPh(3)](2)Cl(2), CuI, triethylamine, THF) to yield products 2a-g in 40-79% yields (heteroaryl = 2-pyridyl, 3-pyridyl, 4-pyridyl, 2-pyrazyl, 5-bromo-2-pyrimidyl…
The effects of fuel chemical composition on particulate matter (PM) emissions of a T63 engine were investigated. Fuels with different aromatic, cycloparaffin (naphthene), iso-paraffin and normal paraffin levels were evaluated in the turboshaft engine and compared to the performance of a typical JP-8 fuel. The fuels st…
We have determined the shape of the miscibility gap of the Cu–Al–Mn alloy system along the Cu3Al → Mn composition line ((Cu3Al)1 − x Mnx with 0 ⩽ x ⩽ 1) using electrical resistance measurements. Electrical resistance measurements have also been used to study the kinetics of the phase separation that takes place within…