Materials Literature
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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…
The most interesting factor in commercial EDLC has been considered as theresistance of the entire cell unit, especially for use at higher out-putcurren density. In order to reduce the resistance of the EDLC cell, the sheet type electrode has been prepared by adding the vapor-grown carbon fibers (VGCFs) a a conductive…
There are a wide range of analytical techniques which may be used for materials characterization depending on the type of information needed. For high resolution surface investigations, two commonly used techniques are Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). Each of these techniques resol…
The isostructural potassium ethyl viologen hexacyanometallates EV1.5K[M(CN)6]·12.5H2O (EV2+ is N,N’-diethyl-4,4’-bipyridinium, M = Fe or Ru) were prepared and characterised.
Considering the effect of the friction force due to volume diffusion of a solute on the driving force, a new kinetic model has been proposed for diffusion induced recrystallization (DIR) in the A(B) system in which solute B atoms diffuse into a pure A metal or a binary A-B alloy. The energy balance model [M. Kajihara…
Abstract Calcium, strontium, barium and lead hydroxyapatites have been investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure (XAFS) and solid state NMR. XPS analyses showed that the binding energies of P 2s or P 2p and O 1s of all hydroxyapatites, XRD…
For effective use of aluminum dross and development of cost-effective refractory with high thermal conductivity, the combustion synthesis of aluminum nitride was experimentally studied, in which effect of metallic aluminum concentration of a raw material and nitrogen pressure on ignition was mainly examined by using a…
This paper numerically analyzes the sound pressure on an object in an ultrasonic cleaning vessel by considering the dissipation of cavitation bubbles. To clarify the effect of ultrasonic attenuation on the number of cavitation bubbles, the cavitation intensity on a brass object is measured experimentally by changing t…
Metastable scheelite EuVO 4 was stabilized by a high temperature and pressure method, which was transformed into a stable zircon phase by annealing treatment in air. Scheelite EuVO 4 gave strong emissions with a dominant peak at 617 nm associated with the 5 D 0 7 F 2 transition of Eu 3 + . 151 Eu Mössbauer spectra i…
4.1 Introduction
Luminescent properties of polycrystals in the visible and infrared spectral ranges were investigated. The presence of two different point symmetries for centers is well established by selective and polarized photoexcitation. The Ca thiogallate compound can be considered as a promising material for optical communicatio…