Materials Literature
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The heat capacity of single crystal La0.7D0.3MnO3, where D=Ca, Sr, has been measured through the Curie point in fields up to 70 kOe. The magnetic contribution of the Ca sample exhibits a sharp heat capacity peak at TC≃218 K in zero field. The peak broadens and decreases in height with increasing field but, unlike an o…
Abstract A lot of fibre and fabric structures or finishing parameters influence the functional properties of fabrics. In order to assess the thermal properties of conventional polyester and microfibre types of fabrics the plate/fabric/plate method for conductivity or cool/warm feeling was used. Fabrics made of microfi…
Abstract Polyurethane elastomers were synthesized using polypropylene glycol (PPG 2000) as the polyol and starch as the multifunctional crosslinker in varying concentrations. Thermal and mechanical properties were measured by DSC, DMA and tensile tests. The morphology was examined by SEM. The swelling behavior of the…
The physical properties of a series of layer double hydroxides (LDH) of the form $[({\mathrm{CO}}_{3}{)}_{0.195(1\ensuremath{-}x)}{\mathrm{Cl}}_{0.39x}({\mathrm{H}}_{2}\mathrm{O}{)}_{y}]:[{\mathrm{Zn}}_{0.61}{\mathrm{Al}}_{0.39}(\mathrm{OH}{)}_{2}],$ $0<~x<~1,$ $0<~y<~(0.4+0.2x)$ have been studied. The hyd…
In search of high-temperature permanent magnet materials, sintered Sm–Co-based magnets with abnormal temperature dependence of intrinsic coercivity have been obtained. These magnets have small negative, or near-zero, or large positive temperature coefficients of intrinsic coercivity. A model of coercivity mechanism ha…
Oxide fibre/oxide matrix composites form an important and attractive subpart of ceramic matrix composites because of their inherent stability in oxidising atmospheres at high temperatures. An important attribute of such composites, however, is that the interfacial bond between oxide matrix and oxide fibre is generally…
Pure indium oxide (In2O3) and SnO2-doped In2O3 (5 and 10 wt %) films were deposited on glass at different substrate temperatures (Ts) ranging from room temperature (RT=25 °C) to 350 °C using pulsed laser deposition. At low Ts (RT to 100 °C), pure In2O3 films yielded the lowest resistivity of (1.8–2.5)×10−4 Ω cm and th…
Yttrium aluminum garnet (YAG, Y 3 Al 5 O 12 ) was synthesized using a polymeric precursor derived from a mixed‐metal citric acid/ethylene glycol/ethanol solution. YAG was found to crystallize directly from an amorphous precursor beginning at temperatures as low as 600°C within 1 h in air. The polymer resin concentrati…
The stresses in periodic Mo/Si, W/Si, and Mo/C multilayer films were determined from wafer-curvature measurements. The layer thickness of each material was varied systematically, and parametric stress contours were generated, showing contours of constant stress in the two-dimensional layer thickness parameter space. T…
The microstructural development and phase‐transformation kinetics of stoichiometric cordierite glasses containing B 2 O 3 and/or P 2 O 5 additives were highly affected by the microstructural characteristics of the μ‐cordierite and the type of additives. The addition of B 2 O 3 tended to cause the formation of μ‐spheru…
The crystalline and amorphous phases of the clay fraction of 10 agriculturally important Hawaiian surface soils were analyzed by x‐ray diffraction (XRD) and the Rietveld method. The clay fraction of these soils was also analyzed by x‐ray fluorescence (XRF). A balance sheet method was used to assign the oxide content o…
This study represents the first taxonomic and ecological description of the diatom flora of Carolina bays, the most abundant, natural lentic systems on the Atlantic Coastal Plain of the United States. Diatoms were collected from surface sediments and benthic and planktonic microhabitats in Carolina bays and other isol…
Abstract We have been working for many years to develop improved methods for predicting the lifetimes of polymers exposed to air environments and have recently turned our attention to seal materials. This paper describes an extensive study on a butyl material using elevated temperature compression stress—relaxation (C…
A constitutive model and a finite element formulation are developed for predicting the thermomechanical response of SMA hybrid composite structures subjected to combined thermal and mechanical loads. The constitutive model is valid for constrained, restrained, or free recovery behavior with appropriate measurements of…
Polycarbosilane‐derived SiC fibers (CG Nicalon, Hi‐Nicalon, and Hi‐Nicalon type S) were exposed for 1–100 h at 1273–1673 K in air. Oxide layer growth and changes in tensile strength for these fibers were examined after exposure. The three types of SiC fibers decreased in strength as the oxide layer thickness increased…
The variation of the secondary electron yield (SEY) of sputter-cleaned oxygen-free high-conductivity copper has been studied as a function of air exposure duration at room temperature. After short air exposures of some seconds the maximum SEY (δmax) of clean copper is reduced from 1.3 to less than 1.2, due to the oxid…
In-situ alternating current (AC) and direct current (DC) electrochemical techniques were used to determine the corrosion rate and corrosion potential of high-purity iron under alternate wet and dry conditions. Comparisons between DC electrochemical measurements and weight loss were conducted to verify the validity of…
A variety of commercially available ceramic‐based oxides, carbides, nitrides, and borides were evaluated for chemical attack in an azeotropic aqueous hydrofluoric acid (HF) test protocol at 90°C. Weight change measurements and microstructure analysis showed that HF corrosion in polycrystalline ceramics generally occur…
SiC‐based fibers with various chemical compositions were synthesized using an irradiation‐curing process. Polycarbosilane (PCS) fibers were cured by irradiation with an electron beam in a helium atmosphere. The cured PCS fibers were pyrolyzed at 1300°C under controlled hydrogen or argon atmospheres, and SiC fibers wit…
This article is the first of a four-part series by the authors that treats various aspects of digital signal processing applied to partial discharge detection. It is shown that manufacturers and users of high-voltage apparatus are interested in on-site, off-line and on-line analysis of partial discharge to identify an…