Materials Literature
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The crystallization kinetics of poly(butylene terephthalate) (PBT), poly(ethylene terephthalate) (PET), and their copolymers poly(1,4-butylene-co-ethylene terephthalate) (PBET) containing 70/30, 65/35 and 60/40 molar ratios of 1,4-butanediol/ethylene glycol were investigated using differential scanning calorimetry (DS…
Recent progress in R&D of SiC fibers and reinforced SiC matrix (SiC/SiC) composites in Japan, especially focusing on the activities of CREST-ACE program, is presented. Firstly, the present status of high performance SiC fiber development, such as Hi-Nicalon Type-S and Tyrano-SA, is provided. The high performance SiC m…
The influence of comonomer content and type on the dynamic-mechanical behavior of some ethylene/α-olefin (1-hexene, 1-octene, 1-decene, 1-octadecene and 4-methyl-1-pentene) copolymers was studied. It was observed that the comonomer content has great influence on α- and β-transitions, but almost no influence on γ-trans…
Silica-supported cobalt catalyst was studied for hydroformylation of 1-hexene. The influence of pore size of the silica support was investigated. It was found that cobalt catalyst supported on silica with appropriate pore size, about 6-10 nm, was active for the reaction with very high selectivity to oxygenates. The sm…
Hydrogen behavior during stress-corrosion cracking in an AZ31 magnesium alloy was studied by using hydrogen microprint technique (HMT), which is a method to visualize points of hydrogen emission from metals. Tensile test specimens were prepared from an extruded bar of the AZ31 magnesium alloy and deformed in tension a…
A search in the Bacillus subtilis genome sequence found that the gene designated yclM encode(s) a protein showing significant identity in amino acid sequence to aspartate kinases. When yclM was introduced into Escherichia coli cells deficient in all three aspartate kinase genes, production of a protein with molecular…
The structure of an Al–Ni–Co decagonal quasicrystal, showing electron diffraction patterns called “type-II”, in an Al71.5Ni12.5Co16 alloy, has been examined by high-angle annular detector dark-field scanning transmission electron microscopy and high-resolution transmission electron microscopy. Its structure has a colu…
In order to reveal the damping behavior of M2052 alloy dependent on the strain-amplitude and frequency, a centrally excited beam sample was used in free-decaying and frequency sweeping damping measurement. The decaying oscillations and the resonant peaks were obtained directly by the surface strain of the sample. Freq…
Four different types of polydepsipeptide-polyether block copolymers were synthesized via ring-opening polymerization of 3(S)-sec-butylmorpholine-2,5-dione (BMD) in the presence of hydroxytelechelic poly(ethylene oxide) (PEO) with stannous octoate as a catalyst.The polymers were an AB block copolymer, an ABA block copo…
Method for lead removal from molten brass was investigated to reduce the concentration of lead in scrap brass. Granular Ca-Si compound was added to the molten brass to form large Ca-Pb-Si compounds. The Ca-Pb-Si compounds were then skimmed off from the molten brass. After casting into a metal mold, the brass ingot was…
A series of new polyphosphazene polymers were synthesized using three different pendant groups with the goal of probing structure–function relationships between pendant group substitution and polymer swelling/water flux through thin dense films. Formation of polymers with relative degrees of hydrophilicity was probed…
The vapour phase alkylation of catechol over supported caesium catalysts gives good selectivity to guaiacol formation, and TPD studies indicate that this result can be correlated with the presence of weak basic sites on the catalyst.
Photochromic acrylates containing both biphenylene and spiro-oxazine moieties with a chiral substituent and the related polymers were prepared and yielded photochromic chiral liquid crystalline systems. The photochromic acrylates containing both an undecamethylene group and a (2S, 3S)-2-chloro-3-methylpentanoyloxy gro…
Failure statistics of German utilities show that more than 80% of the supply interruptions of medium voltage (MV) customers are caused by component outages located in the MV network itself. For these networks a model as near to reality as possible is required to correctly determine customers' quality of supply. O…
Infrared (IR) absorption spectra of pyrochlore-type -doped proton conductors, i.e. , and systems, were studied by the diffuse reflection method. The O-H stretching vibrations due to the protons dissolved in the crystal with negligible effects of adhesion and/or adsorption water could be detected by improvement of the…
The objective of this research was to examine how swelling treatments affect the hydroxyl availability and surface chemistry of recycled fibers. It also assessed the use of organic liquids in mitigating fiber hornification, the loss of hydrogen-bonding ability in recycled fibers. Hardwood bleached kraft pulp fibers we…
Periodic mesoporous organosilicas with rope-based morphology from a reaction gel composition of 1 BTME : 0.57 ODTMABr : 2.36 NaOH : 353 H2O were synthesized. While long rope-shaped product dominated in case of static synthesis condition, gyroid type products instead of rope shaped product appeared and rope shaped prod…
This paper describes the derivation of a salient-pole synchronous generator harmonic model in the form of a harmonically coupled impedance matrix. In sequence components, the relationship between the generator harmonic voltages and currents in the presence of saliency can be represented by analytical expressions, whic…
Propagation characteristics of partial discharge signal in GIS were investigated in a laboratory and at a 300 kV underground substation. The laboratory test indicates that signal damping can be attributed to two major mechanisms; reflection due to irregularity of characteristic impedance such as spacers, and the mode…
Abstract This article describes the synthesis, manufacturing, and properties of both the neat soy-based resins and the glass, flax, and hemp composites. A tabulation of the fatty-acid distribution in various plant oils is provided. The article discusses synthetic pathways for triglyceride-based monomers and provides a…