Materials Literature
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This paper describes experimental results of a magnetic refrigerator operated at room temperature. Spheres of Gadolinium, 2.2 kg in weight and 0.3 mm in diameter, are used as a magnetic working material. The magnetic materials were divided into two vessels and reciprocated between high and zero magnetic fields. High m…
Description Twenty-seven peer-reviewed papers give you the latest research in thermal engineering. Topics cover: Materials—vacuum panel insulations, a new category of high performance products, are used wherever high thermal resistance is desired in confined space applications, such as transportation, equipment, and a…
Fourier transform infrared microspectroscopy has been used to provide a better understanding of filiform corrosion processes on coated aluminum alloys. Results from scanning Kelvin probe microanalysis are also presented. The investigations were performed on untreated or chromium-free pretreated AA6016 covered with an…
Pulse discharge sintering (PDS) technique was employed to synthesize the ternary compound Ti3SiC2 from four starting powder mixtures. The experimental results demonstrated that when the starting material of 3Ti/Si/2C or 3Ti/SiC/C was used high content of the secondary phase, TiC, higher than 30 mass%, was found in the…
A supported lanthanum gallate (LSGM) electrolyte thin-film solid oxide fuel cell with Ni-YSZ cermet anode and strontium-doped lanthanum manganite (LSM)-yttria stabilized zirconia (YSZ) composite cathode was, for the first time, fabricated and tested. The cell was prepared by an unconventional approach, in which an LSG…
Primary crystallization field of cuspidine (3CaO · 2SiO2 · CaF2 ) has been experimentally determined in the 2CaO · SiO2–SiO2–CaF2 system by quenching method and differential thermal analysis (DTA). Hermetically closed platinum capsules were used as a sample container to prevent fluorine loss in the form of HF and SiF4…
Horseradish peroxidase (HRP) was encapsulated in preformed polyelectrolyte multilayer (PEM) microcapsules by spontaneous deposition with remarkably improved stability and catalytic activity.
Effective surface rate constants for oxygen incorporation have been determined for single-crystal Fe-doped from chemical relaxation experiments, by in situ , spatially resolved optical absorption spectroscopy, and from tracer exchange experiments, by subsequent secondary ion mass spectrometry analysis. Experiments wer…
Heat transfer models of molten metal droplets moving in a gas stream are used extensively to understand and improve gas atomization systems. In particular, the solidification microstructure of the metal droplets produced during atomization is closely linked with heat flow conditions. The cornerstone of these models is…
The temperature dependence of crevice corrosion initiation on titanium grade-2 has been investigated using a galvanic coupling technique. The film breakdown/repassivation transients indicate a temperature threshold, around 65°C, for the initiation of crevice corrosion. The number, size, frequency, and background curre…
Numerous methods are currently in use to measure the fracture toughness of ceramic materials. Methods based on widely accepted theory are often difficult to realize, unreliable, or expensive. Recently, the single-edge-V-notched beam (SEVNB) method, where a saw cut is tapered to a sharp V-notch using a razor blade spri…
Conventional thinking for cells under concentrated sunlight would suggest that short circuit current, and hence also open circuit voltage, can be determined exactly by the total illumination falling onto the cell. However with most concentrator systems the cells are exposed to highly focused light, with consequent non…
Polyhydroxyalkanoates (PHAs) are polyesters naturally produced by bacteria that have properties of biodegradable plastics and elastomers. A PHA synthase from Pseudomonas aeruginosa modified at the carboxy-end for peroxisomal targeting was transformed in Pichia pastoris. The PHA synthase was expressed under the control…
Thermoplastic starch is potentially a low cost alternative biodegradable plastic that is readily available material, but owing to its poor mechanical properties and high susceptibility to water, its actual replacement of the polymers currently in use is limited. In this study we investigated the employment of wood pul…
Oxygen reduction on Cu in near-neutral 5% NaCl and its subsequent inhibition by Cr(VI) and Ce(III) compounds has been examined using stationary and rotating Cu electrodes. The results show that Cr(VI) is a highly efficient inhibitor not matched by comparable concentrations of Ce(III) in its effect. Results suggest ( i…
General introduction Topological spaces and dynamical systems Groupoids, $C^\ast$-algebras, and their invariants Approaches to Calculation I: Cohomology for codimension one Approaches to Calculation II: Infinitely generated cohomology Approaches to Calculation III: Cohomology for small codimension Bibliography.
High-silica zeolite with (MTW), Beta with (BEA), and ZSM-5 with (MFI) coatings were synthesized by hydrothermal crystallization without seeding using a new two-silica method on Al-alloy (Al-2024-T3 and Al-6061-T4) and stainless steel (SS-304). The pure-silica MTW and BEA coatings synthesized in this study have not bee…
We studied systematically the crystal structure of simultaneously ferroelectric and antiferromagnetic RMn 2 O 5 (R = Pr-Lu and Y, except Tm) oxides, based on powder X-ray diffraction and Rietveld analysis. We propose a simple picture of the change of the structure with the size of a rare earth ion.
A magnesium (Mg) solid solution with a novel long periodic hexagonal structure was formed for a Mg97Zn1Y2 (at%) alloy in a rod form prepared by extrusion of atomized powders at 573 K as well as in a melt-spun ribbon form. The novel structure of the rod alloy had an ABACAB-type six layered packing with lattice paramete…
A series of six, cationic, zwitterionic and anionic Eu complexes has been examined for the analysis of hydrogencarbonate concentration in the intracellular and extracellular ranges; an anionic complex incorporating three glutarate residues and a sensitising acridone chromophore (lambda exc = 410 nm) exhibits a 69% cha…