Materials Literature
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The kinetics of transient photocurrents in tin-doped a-As2Se3 and a-AsSe films are found to be strongly dependent on the light intensity and temperature, as well as on the glass composition and tin concentration. The experimental results are interpreted in terms of the multiple-trapping model with the photoconductivit…
One of the major product specifications of a crystalline material is the crystal size distribution (CSD). In order to monitor and control the CSD in an industrial crystallization process, on-line sensors are required. Over the years, a number of techniques to measure the CSD have been established. In this paper, three…
A deep analysis of the behavior of transformer winding impedances for high frequencies is performed. The properties of inductance matrices are analyzed, as well as the possibility of making assumptions and their range of validity. The properties of resistance matrices are also analyzed, which has not been made in the…
New liquid crystalline compounds involving intermolecular hydrogen bonding between mesogenic p-n-alkoxybenzoic acids (nABA) (where n denotes the alkoxy carbon number varying from propylto decyl- and dodecyl-) and p-aminobenzonitrile (ABN) are synthesized. The thermal and phase behaviour of these materials is studied b…
The room‐temperature elastic constants of ErVO 4 were considerably smaller than those of isostructural silicate and phosphate analogs. The generally “less‐rigid” crystalline lattice and weaker metal‐oxygen bond‐strength in the RVO 4 (R = rare earth elements) phases indicates that these materials are of interest for po…
The phylogenetic affinities of Lobocharacium coloradoense were investigated by analysis of combined 18S and 26S rDNA data. Results from both parsimony and likelihood methods supported a close alliance among Lobocharacium , Characiosiphon , and Characiochloris. These three taxa formed a clade near the base of the “ Dun…
A promising stress control process is demonstrated to achieve near-zero stress levels in thick porous silicon (PS) films. Stress reduction is necessary for thick PS structures to be used for radio-frequency applications such as on-chip inductors and transmission lines that require very thick (>100 μm) insulatin…
Moldable, cellulosic-based nonwoven composites with excellent thermal insulation properties were fabricated from kenaf, jute, flax, and waste cotton using recycled polyester and substandard polypropylene. The composites of these fibers have excellent shape stability and high tensile and flexural properties coupled wit…
Bis-azido methyl oxetane (BAMO) was synthesised from pentaerythritol in two steps. Pentaerythritol was chlorinated to yield a mixture of mono, di, tri and tetra chloro compounds. The trichloro compound on ring closure gives bis-chloro methyl oxetane (BCMO). It was reacted with sodium azide in aqueous medium to obtain…
Tm 3+ ‐Ho 3+ ‐ and Tm 3+ ‐Ho 3+ ‐Eu 3+ ‐ion‐codoped oxyfluoride transparent glass‐ceramics containing PbF 2 nanocrystals were prepared, and the near‐infrared fluorescence properties of the Tm 3+ ions were investigated for their potential use as a 1.4 μm amplifier. For all samples, the lifetime of the Tm 3+ : 3 H 4 lev…
Abstract Polypropylene powder and sisal fibers were oxygen plasma treated, and the mechanical properties of their composites were tested. Two main effects were investigated: the incorporation of oxygen polar groups in the polypropylene surface and the surface degradation and chain scission of both polypropylene and si…
Soluble poly(methylsilsesquioxane) (PMSSQ) precursor is a potential dielectric candidate for advanced microelectronic devices based on a multilayer structure. Thermogravimetric and FT-IR spectroscopic analyses showed that the precursor undergoes a curing reaction between 100 and 450°C. Time-resolved stress analysis of…
Si–N based membrane calorimeters are a promising technology for the study of thermal properties of small quantities of materials in both pulsed and steady-state magnetic fields to 60 T and beyond. We present results that demonstrate our ability to measure the heat capacity of thin film samples from 2–300 K in steady-s…
(100)‐oriented, perovskite‐type LaNiO 3 thin films were prepared on SiO 2 glass substrates by the sol–gel method. Effects of thermal processing on the orientation, surface morphology, and electrical properties of the films were investigated. The nearly complete (100)‐orientation was achieved by drying the films at tem…
Photodarkening relaxation under light exposure of a-As2Se3 amorphous films doped with 0.5 at.% of metals Sn, Mn, Sm or Dy and a-AsSe films doped up to 10.0 at.% Sn was studied to determine its dependence on the type and concentration of impurities and thermal treatments. Both factors reduce photodarkening with the deg…
PbZr 0.53 Ti 0.47 O 3 (PZT) thin films with various preferred crystallographic orientations were synthesized on various substrates using pulsed laser deposition techniques. Larger piezoelectric displacement, which involved the bending vibration of the PZT film/substrate, was observed in randomly oriented PZT thin film…
Aligned carbon nanotube arrays have been grown on Si substrates in methanol by using a hot-substrate method. Samples were grown in a glass chamber equipped with a function in which methanol and ethanol vapors were condensed by means of water-cooling. Si substrates with a thin Fe film were electrically heated to 930°C…
The clinically used beta-lactamase inhibitor clavulanic acid is produced by fermentation of Streptomyces clavuligerus. The orf6 gene of the clavulanic acid biosynthetic gene cluster in S. clavuligerus encodes a protein that shows sequence homology to ornithine acetyltransferase (OAT), the fifth enzyme of the arginine…
Three calcium α‐SiAlON microstructures—namely, fine‐grained, bimodal, and large elongated—were developed using powders of the same composition and then characterized. The evolution of grain size and morphology was determined to be a process of nucleation and growth that could be controlled with a two‐step sintering te…
Abstract Dioctahedral phyllosilicates from an altered rhyolitic hyaloclastite located at Ponza Island, Italy, were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The samples are from a sequence previously characterized by X-ray diffraction (XRD) methods, indicating that a com…