Materials Literature
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The glass transition of highly ordered columnar discotics within the framework of the concept of fragility is discussed. The discussion is based on experimental findings from dielectric relaxation spectroscopy, calorimetric, and X-ray scattering measurements. The findings are that discotics in their three-dimensionall…
We discuss the deformation of a curved interface between solid phases, assuming small strains in the bulk phases and neglecting accretion at the interfaces. Such assumptions are relevant to the deformation of solid microstructures when atomic diffusion and the formation of defects such as dislocations are negligible.…
This paper attempts the geometric modeling of woven and braided fabric structures in three dimensions using a computer aided geometric design (CAGD) technique. A new symbolic approach to fabric structure representation, which is useful to the textile CAD/CAM process and fabric design, is presented, and a basic model i…
Benzotriazole-mediated indirect electrophilic substitution in the position para to the oxygen atom of benzo[b]pyrylium salts has been used for the synthesis of long-chain and bifunctional benzo[b]pyrylium species. The methodology has potential for application in high technology and the pharmaceutical industries, for t…
The use of Al2O3 polycrystalline fibers and whiskers as strengtheners in high-temperature composites is of great interest owing to their high elastic modulus and their thermal and chemical stability. The authors describe in this communication a novel type of crystalline α-Al2O3 fiber. These new fibers—termed ribbons b…
Supercritical fluid crystallization (SCFC) method is proposed for preparing microcrystals of π-conjugated organic compounds as a development of conventional reprecipitation method. In SCFC method, both size and form of titanylphthalocyanine microcrystals could be controlled by changing experimental conditions such as…
High voltage solid dielectrics are employed in a wide range of electrotechnology, from video flyback transformers to transmission-class solid dielectric cables. The design criteria for the application of such dielectrics are well developed, and failure is primarily the result of unanticipated defects. In this context,…
Paralia sulcata (Ehrenberg) Cleve is a brackish to marine diatom commonly found in coastal waters. In Saanich Inlet, Vancouver Island, British Columbia, P. sulcata is a dominant species in both the phytoplankton and sediments. The stratigraphy of this species from sediment cores shows an increase in absolute abundance…
RATIONALE AND OBJECTIVES: The authors have investigated dysprosium [Dy]-DOTA-PAMAM, generation 5 (G = 5) dendrimers as a possible new class of macromolecular T2 contrast agents. The use of DOTA provides a metal complex with greater stability than can be achieved using DTPA as ligand, an important factor in the design…
The thermal conductivity of a randomly oriented composite material is modeled using a probabilistic approach in order to determine if a size effect exists for the thermal conductivity at small composite thicknesses. The numerical scheme employs a random number generator to position the filler elements, which have a re…
It is accepted that the cooling rates of alloys during solidification can strongly influence their microstructure and, consequently, their corrosion resistance and mechanical properties. However, the influence of the cooling rate on the dendrite arm spacings of alloy AZ91 is not often discussed in the literature, and…
A 50 kV Ga+ focused ion beam was applied for milling submicron Pt-(La0.5Sr0.5)CoO3–Pb(NbxZryTiz)O3–(La0.5Sr0.5)CoO3–Pt-based ferroelectric capacitor heterostructures prepared by pulsed laser and sol-gel deposition techniques. The milling yields were found to be 0.22±0.02 μm3/nC for Pb(NbxZryTiz)O3, 0.3.4±0.01 μm3/nC f…
We introduce a dynamical model and carry out computer simulations for phase separation of diblock copolymer-homopolymer mixtures. The homopolymer chains are assumed to be compatible with one of the blocks of the diblock copolymers whereas the two blocks of the diblock copolymer chains are mutually incompatible. In thi…
Abstract The recycling of rubber from waste tires and other products has been of commercial and environmental interest for several decades. For recycling, bulk properties are most relevant; whereas, for crumb incorporation both bulk and matrix-crumb interface phenomena are important, which are dealt with in this study…
ABSTRACT The effects of drying temperature, drying relative humidity and film thickness on the drying characteristics, water vapor permeability, and tensile properties of glycerol (Gly)‐plasticized whey protein isolate (WPI) films were investigated. 50%WPI:50%Gly and 60%WPI:40%Gly (dry basis) films were studied. Const…
The modulus of rupture of Al 2 O 3 ‐spinel castables containing 20 wt% Al 2 O 3 ‐rich MgO‐Al 2 O 3 spinel and 1.36‐2.04 wt% CaO generally increases with an increase in both CaO content and temperature from 1300° to 1500°C, but it remains virtually constant from 1000° to 1300°C. Microscopic observation of the castable…
Many hopes and much controversy have surrounded the application of the maximum-entropy (ME) method to accurate charge-density studies. This paper shows that viewing such studies as an extension of Bayesian crystal structure determination provides practical means of fulfilling many of the hopes invested in the ME metho…
RATIONALE AND OBJECTIVES: The authors investigated the effect of multimerization on the relaxivity of macrocyclic gadolinium (Gd) chelates. The objective was to develop more sensitive magnetic resonance imaging (MRI) contrast agents to study biochemical processes. METHODS: Covalently linked nonionic, macrocyclic, mult…
An analysis of the correlation of theoretical predictions for Auger electron intensities is made with the experimental data of the high-resolution digital Auger database. This analysis covers single-element samples measured for 5 keV and 10 keV beam energies. The spectral data are for wide scans of 20–2500 eV at 1 eV…
A full-thickness wound model was used to evaluate the effects of a topically applied polyethyleneimine-based nitric oxide donor on wound repair in aged rats. Polymer applications were applied over a 10-day period on days 0, 2, 4, 6, and 8 comparing treatment (linear polyethyleneimine-nitric oxide) and control groups (…