Materials Literature
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The kinetics of spreading of molten poly(ethylene terephthalate) (PET) on aminopropylsilane (APS) treated glass fiber surfaces has been studied. The modified Wilhelmy wetting method was used for contact angle determination with small diameter fibers (10-100 μm) used as vertical wetting probes. It is shown that the sma…
The finite element technique has been used to develop a software package which, with the help of an IBM/PC 386 computer, can determine two dimensional magnetic fields and power loss in transformer cores. The program takes into account both the non‐linear B‐H characteristic and the anisotropy of the core material.
Abstract The nature of the chain‐folding in polyethylene lamellar structure from the melt has been studied. Permanganic etching was used to reveal the morphology by selective removal of material from the surface of the specimen. This was done to prepare the sample for transmission electron microscopy. The micrographs…
The adsorption of tris(1,10-phenanthroline)copper(II) ([Cu(phen) 3 ] 2+ ) by a clay mineral has been studied with electron spin resonance (ESR) measurements. The chelate, tris(1.10-phenanthroline)copper(II) ([Cu(phen) 3 ] 2+ ), is co-adsorbed with a large excess of racemic or enantiomeric [Ru(phen) 3 ] 2+ . The spectr…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Fracture toughness of Si3N4 ceramics with and without addition of TaSi2 particles, prepared by hot-pressing at 1750°C and 1650°-1750°C, respectively, was determined. The fracture toughness increased significantly with increasing TaSi2 content. The enhanced toughness by the addition of TaSi2 particles was interpreted t…
Abstract Auf einem breiten Spektrum von Böden in westafrikanischen Teakplantagen ( Tectona grandis L.) wurden signifikante Beziehungen zwischen den P‐Blattgehalten von Tectona grandis und den Ergebnissen der P‐Bodenanalysen nachgewiesen, wenn nicht ausschließlich sehr ton‐ oder humusarme Böden (< 15% T bzw. < 1%…
Abstract The rate of thermal decomposition of azobisisobutyronitrile (AIBN) dissolved in xylene was investigated alone and in the presence of tin(IV) chloride over the temperature range of 90–107°C. It was found that the decomposition rate of AIBN increases linearly with increasing concentration of tin(IV) chloride, w…
The linear birefringence study of the N- -INC phase transition in [N(CH3)4]2CoCl4 and [N(CD3)4]2ZnCl4 is reported. The deviation from the linear behaviour above Ti can be well fitted by an exponential law, which is at present purely phenomenological. The temperature dependence of the order parameter has been extracted…
The purpose of the present study is to shed light on the electrical conduction mechanism and temperaturedependence of conductivity in polymer filled with conductive particles.The electrical resistivity of crystalline polymer composite shows a large positive temperature coefficient (PTC) below the melting temperature (…
When sintered Al 2 O 3 is annealed with CaMgSiAlO glass at 1600°C, polyhedral MgAl 2 O 4 grains form and glass pockets are entrapped within the grains. After annealing for 13 h at 1600°C, the liquid pockets show a regular octahedron shape which is expected to represent the equilibrium shape. All grain surfaces in cont…
Rice husk has been treated with concentrated HNO3 to give a colloid and other products. The colloid, when separated and aged, gave a non-uniform distribution of gel-like spherical particles. It is suggested that the process is a polymerisation with gel size varying according to degree of polymerisation.
Secondary hardening characteristics and those effects on a wear and a thermal shock resistance of the 5%Cr-2%Mo-1%V steel roll for cold strip mill were studied.The secondary hardening by a tempering was induced both by the precipitation of carbide during holding stage and by the transformation of retained austenite to…
Dispersion-strengthened copper alloys have shown promise for certain high heat flux applications in both near-term and long-term fusion devices. This study examines mechanical properties changes and microstructural evolution in several oxide dispersion-strengthened alloys which were subjected to high levels of irradia…
A process was developed by which rails are cooled immediately from the rolling heat in such a way that the fine pearlitic structure essential for optimum wear properties is achieved in practically the whole area of the head. Discussed are manufacturing parameters for heat treatment directly from rolling heat; criteria…
Mesophase pitches derived from naphthalene and anthracene were prepared in the presence of a Lewis acid, AlCl3, with varying the reaction conditions. The C/H ratio of naphthalene pitches increased with an increase in temperature and naphthenic groups were introduced into pitches in the early stages of the reaction. At…
ゾーン延伸を融点付近で行う高温ゾーン延伸法で得られたナイロン6繊維の高次構造及び力学的性質を延伸温度との関係で検討し, さらに繊維の高強度・高弾性率化を試みた. 190℃から210℃までの温度域では延伸温度の上昇につれ延伸倍率, 複屈折, 結晶化度, 非晶配向係数, 及びヤング率はしだいに増加し, 210℃で延伸した繊維の延伸倍率は5.3倍, 複屈折は56.3×10-3, 結晶化度は51%, 非晶配向係数は0.57及びヤング率は5.9GPaである. 一方, 210℃以上の延伸では延伸倍率は急増するが, 複屈折, 非晶配向係数, 及びヤング率は著しく低下する. 215℃で延伸した繊維では延伸倍率は7.8倍, 結晶配向係数は0.860…
A stainless steel reactor has been used to investigate the reactions of mono-, di-, tri- and tetraamines, amino alcohols and amino ethers in degassed aqueous solution at 240–300 °C. The predominant reactions involved nucleophilic substitutions, where the amino nitrogen acts as the nucleophile, and not solvolyses. With…
An experimental study has been made of the effects of alloying elements and austenite destabilization heat treatment on the graphitization in the as-cast and heat treated condition, of a high chromium cast irons containing 3.8%C-11%Cr-2.3%Si-5.5%Ni-1.3%Mn-1.2%Mo as hypereutectic alloy and 3.4%C-7.5%Cr-2.5%Si-1%Mn-1.3%…
Results are presented of measurements of the non-linear dielectric effect on approaching the critical consolute point in a solution composed of a liquid crystal (MBBA) and a non-mesogenic component (isooctane). The coordinates of the critical point are T c ≈ 2°C and x c ≈ 0.77 mole fraction of isooctane. The exponent…