Materials Literature
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Abstract The thermal degradation of virgin and HCI‐treated PVC in powder form, as well as of PVC films of different thicknesses, has been studied as a function of time and temperature. The rate of dehydrochlorination was determined conductimetrically and from the polyene sequence distributions as obtained by UV spectr…
Graphite components of a High Temperature Gas-Cooled Reactor (HTGR) core will be subjected to fast neutron irradiation-induced damages causing changes in engineering properties which are dependent significantly on irradiation temperature and neutron fluence. A Graphite Damage Model (GDM) elaborated to interpret observ…
Abstract Thermoplastic epoxy resins have some special applications. In this study, the diglycidyl ether of bisphenol‐A and three different monoamines—butylamine, hexamine, and dodecylamine—at different epoxy–amine ratios were used to make epoxy resins. Relative viscosity, hardness, Vicat softing temperature, volume re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControlled potential coulometric method to determine the average titanium oxidation state of titanium chlorides in sodium chlorideCharles E. BaumgartnerCite this: Anal. Chem. 1992, 64, 17, 2001–2002Publication Date (Print):September 1, 1992Publication History Published onlin…
Abstract Whenever asymmetrical winding arrangements of transformers are to investigate, the use of three‐dimensional calculation methods is essential. In this paper an alternative method to the classical Finite Element formulation is used, based on reduced and total scalar potentials. The basic equations of this metho…
Abstract Tetragonal zirconia ( t - ZrCO 2 ) can be stabilized with 15 to 22 mol% YTaO 4 . X-ray powder diffraction data for the end members of the solid solution series Zr 0.76 Y 0.12 Ta 0.12 O 2 and Zr 0.66 Y 0.17 Ta 0.17 O 2 are reported along with lattice parameters across the single phase region. These tetragonal…
Impurity effects of Nb+5 dopants were investigated on optimum calcination temperatures and grain growth in sintering process. As the amount of Nb+5 dopant increased, optimum calcination temperatures increased. Grain sizes in sintered ceramics decreased in inverse proportion to the amount of Nb+5. Experimental results…
Abstract Nonlinear kinetics of both spinodal decomposition at early stages, and the dissolution of homogeneities formed during spinodal decomposition, is studied. Variation of the scattering intensity during a complete cycle consisting of a step temperature change from T 1 in the one‐phase region to T 2 in the two‐pha…
F-Actin was digested with alpha-chymotrypsin in 6 M urea, and two peptide fragments from subdomain 4 of actin molecule [Kabsch, W., Mannherz, H.G., Suck, D., Pai, E.F., & Holmes K.C. (1990) Nature 347, 37-44] were purified by reverse-phase HPLC and Sephadex G-50 gel filtration. The peptide fragments were identified as…
The authors discuss the relation of eddy current losses to dynamic domain behavior for very thin 3%Si-Fe strip-wound cores up to 5 kHz. The dynamic domain behavior was observed by using scanning electron microscope. The stripe domain structure B/sub 8/, and H/sub c/ were recovered after the strip was wound into a core…
A type of transformer with reduced iron loss, which is excited by a semirotating magnetic field, has been investigated. Factors (method of excitation and slits in the core) affecting iron losses are examined. The iron loss of this type of transformer can be reduced below the material loss as measured for normal AC exc…
In the trichalcogenide family of compounds ${\mathrm{Zr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Hf}}_{\mathit{x}}$${\mathrm{S}}_{3}$ there is a frequency range where the optic modes are expected to be describable by a simple one-dimensional model. It is shown that the disorder-induced linewidth in the relevan…
For the PZN-PT-PZ ceramic system, the difference in the temperature characteristics of piezoelectric properties between the tetragonal phase and the rhombohedral one was studied from the viewpoint of a domain reorientation mechanism. From the measurement of thermal expansion and the change of high-temperature X-ray di…
Thermomagnetic measurements were used to determine the oxidation kinetics of bulk and powdered Nd-Fe-B magnets under a pressure of 1 Pa in the 360–600 °C temperature range. Those conditions are roughly similar to those undergone by sintered or rapidly quenched magnets during heat treatment. The first step of the oxida…
Abstract Palygorskite has been identified at Canaan, Thomson Hill, and Riwaka in northwest Nelson, South Island. The clay mineral appears in sheet‐like form; hand‐picked specimens have been examined by chemical analysis, X‐ray diffraction (XRD), infrared spectroscopy (IR), and transmission and scanning electron micros…
An XPS spectrum of elemental lead (Pb) is presented. The Pb foil was supplied commercially (Goodfellow Corp.) as a 0.1 mm thick specimen of quoted purity 99.95%. The BE range 1000–0 eV is documented.
The effects of the substitutions of Dy and Er for Sm on the crystal structure and magnetic properties of Sm/sub 2/Fe/sub 17/ and Sm/sub 2/Fe/sub 17/N/sub y/ compounds have been investigated. The structures of (Sm/sub 1-x/R/sub x/)/sub 2/ Fe/sub 17/N/sub y/ compounds with R=Dy and Er and the hosts change from Th/sub 2/…
Measurements have been made of the complex piezoelectric coefficient (d31), by a quasistatic method, so as to determine its real and imaginary components as a function of frequency (f = 10−3 - 103 Hz) and temperature. Results obtained with Ca-modified lead titanate and lead lanthanum titanate-zirconate ceramic samples…
Abstract The aim of this work is the study of the electrochemical behaviour and corrosion resistance of copper alloyed vacuum sintered stainless steel. The presence of copper can improve the passivability of sintered stainless steel and, as a consequence, the corrosion resistance; moreover, vacuum sintering allows mat…
Flight-performance modeling is conducted to compare the qualities of four radome materials in the light of three radome materials currently in use. The current radome materials are slip-cast fused silica, Rayceram 8, and Pyroceram 9606, and the ceramics tested for possible application are celsian, nitroxyceram, hot-pr…