Materials Literature
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It is well known that the difference in the coefficient of thermal expansion of the components of titanium matrix composites with the SCS-6 SiC-fiber gives rise to substantial residual stresses. Due to the fact that the fiber/matrix bond strength is low (as long as there is still a substantial thick carbon protection…
The reaction between iron oxides and iron‐carbon melts was studied in the temperature range 1523–1973 K. Pellets made from three different sources of iron oxides were added onto the melt surface, and the reaction time was measured through the constant volume pressure increase (CVPI) method. The effects of reaction tem…
Oxynitride deep-ultraviolet antireflective coating (DARC) of Si wafers is used to get better lithography at 248 nm. The thickness and the optical parameters of these films have to be optimized to get good and reproducible results. In this context, DARC layers with different N2O flows have been processed and characteri…
The application of surfactants in daily life increases due to a large number of useful applications in industries and pharmaceuticals. The synthesized copper soaps and their urea and benzothiazole complexes have been confirmed by IR, NMR spectral analysis. The antifungal activities of copper soaps derived from mustard…
The electronic structure of PbWO4 crystal is studied with the relativistic self-consistent discrete variational embedded cluster method in the framework of density functional theory. The results show that the valence band is mainly made up of O2p with a certain amount of W5d component, and the conduction band is mainl…
Core-extended perylenetetracarboxylic bisimides were prepared by Diels-Alder reaction followed by reduction, or by nitration followed by cyclisation. Highly fluorescent dyes were obtained with absorption regions from the visible to the NIR. Applications for solar energy harvesting, and quantum counters were suggested.
Air was gradually supplied through a small vertical hole to form a single bubble on the upper surface of a horizontal flat plate of poor wettability. The bubble grew with an increase in the supplied air volume. The growing behavior of the bubble was observed with a CCD camera. The shape and size of the bubble on the u…
Wilhelmy technique was used to measure the single fiber advancing contact angle of AKD and ASA sized pulp fibers. When sizing performance was fully developed, the advancing contact angle of AKD sized pulp fiber was 85°, while the ASA sized pulp fiber was 95°. Waterdrop absorption measurement also indicated that ASA wa…
NdFeB sintered magnets with the addition of Ag were prepared by blending hydrogen decrepitated NdFeB powder with Ag powder during ball milling. It was found that small additions of Ag powder increases the coercivity of the magnets without reducing the remanence. A microstructure study showed that oxygen content in the…
In order to clarify the size effect of an interlacer, we measured air pressure distributions on the yam duct wall of interlacers with various sizes of both yarn duct and air jet nozzle for a wide range of the supplied air pressure in a rectification tank. The pressure in the yarn duct does not always increase with the…
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Poly(isoprene-co-isobutylene) (IIR or butyl) and chlorinated poly(isoprene-co-isobutylene) (CIIR or chlorobutyl) compounds containing combinations of zinc dimethyldithiocarbamate [Zn2(dmtc)4], tetramethylthiuram disulfide (TMTD), sulfur, and ZnO were vulcanized at 150°C, the reaction was stopped at various points, cro…
The types,preparation,properties,characterizations,applications and prospects of porous ceramics are reviewed in this article.
Dynamic loading of brittle materials is related to many applications, including explosive excavation of rocks, design of ceramic armor, meteor impact on spacecraft windows, particle damage to turbine blades, etc. When brittle materials are exposed to impact or explosive loading, inelastic deformation, fracture, and fr…
Low phonon energy non-fluoride glasses are potentially useful hosts for a 2.7µm erbium doped fiber laser. A characterization of the optical properties of Er 3+ doped and Er 3+ , Pr 3+ codoped bulk samples of heavy metal oxide and chalcogenide glasses is presented. Absorption spectra have been measured and energy level…
An extensive study of the kinetics of the iodide titanium process, performed in a flow system by the thermal decomposition of titanium tetraiodide over a tungsten filament substrate, is presented in this paper. The influence of the substrate temperature, , and reactant pressure, , on the process rate has been analyzed…
Thin‐film solar cells from polycrystalline silicon on inexpensive nonsemiconductor substrates are an option for reducing costs. We have investigated the deposition of silicon layers on ceramic substrates. The aim was to manufacture high‐quality polycrystalline silicon films with a thicknesses up to 40 μm. The experime…
High-melting-point polymers with heterocyclic backbone units were synthesized from common amino acids. Acids were first converted to methyl ester salts and then were dimerized to form diketopiperazines, which were polymerized in solution. Aspartic acid, serine, lysine, glycine, and tyrosine were used as starting mater…
Description This unique volume explores the use of various standardized methods for specifying and controlling the compaction of soils for engineered constructed earth fills. Topics address the historical background, current state-of-the-art practices, case histories of challenging situations, new concerns regarding a…
The seasonal dynamics of cyanobacterial and diatom assemblages in 11 water bodies along a meso- to hypertrophic gradient were compared. The cyanobacterial and diatom communities are charac- terised according to representative species of each algal class, selected by data reduction following prin- cipal component analy…