Materials Literature
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NH3/CO/O2/Ar系高温気相反応におけるNH3からのNO, N2OおよびN2生成について理論解析を行い, 流通式管型反応管を用いて得られた実験結果と比較した.計算は21個の化学種を含む65個の素反応について行い, その結果をNH2/H2/O2/Ar系の解析結果とも比較した.実験との比較は, 反応温度950～1350K, [NH3] 0=1000ppm, [H2] 0=0.2～3.0%, [CO] 0=3.0%, [O2] 0=0～3.0%, [Ar] 0=バランスの条件のもとで行った.その結果, 本研究の範囲において, 次のような知見を得ることができた.1) 本研究に用いた素反応モデルは, 実験結果を良好に説明することができ…
The Ni-Ti type shape memory alloy has been applied in many fields, though the welding process for it is not so sufficiently studied. The development of various welding processes must bring this alloy to the wider use in more fields.So far, the study on the electron beam welding, the laser welding, the resistance weldi…
Abstract By utilizing the laser induced pressure‐pulse (LIPP) technique, the behavior of space charge in low‐density polyethylene (LDPE) and crosslinked polyethylene (XLPE) films in contact with metal or carbon‐loaded semiconducting layers was studied quantitatively to clarify the space‐charge characteristics in power…
Abstract Dielectric relaxation measurements are reported on plasticized commercial and heterogeneously substituted cellulose acetate. Differences in the observed behaviour are attributed to the retention of a degree of crystallinity and microscopic structure in the original substituted cellulose samples. A comparison…
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…