Materials Literature
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X-Ray emission (XE) and both core and valence-band X-ray photoelectron (XP) spectra have been measured for LiF, NaF, KF, BeF2, MgF2, CaF2, SrF2 and BaF2. Both the F 1s ionisation energies and the F Kα X-ray energies decrease as the cation atomic number increases within a group of the Periodic Table. Knowledge of the F…
A staged, subscale turbine combustor based on a promising rich-quench-lean combustion approach to reduce NOx emissions was used to evaluate deposition, erosion, and corrosion (DEC) from coal-water fuels (CWF). This combustor was operated with three CWF at conditions of a recuperated turbine. Specimens were exposed in…
Abstract The attenuated total reflection (ATR) technique has been used to obtain infrared spectra of heat‐set poly(ethylene terephthalate) (PET) fibers. The trans and gauche content have been estimated from the absorbances of the trans band at 1342 cm −1 , the gauche band at 1370 cm −1 , and the internal standard band…
Abstract The composition of polymer blends and alloys and the crystallinity and crystallite size/perfection of each of the components are determined by X‐ray diffraction (XRD) methods. A profile‐fitting procedure is used to resolve the XRD scan into crystalline and amorphous peaks corresponding to each of the polymers…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of phase separation of Nafion perfluorinated ionomer and poly(vinylidene fluoride) blendsJen Chang Yang and Thein KyuCite this: Macromolecules 1990, 23, 1, 182–186Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue…
Coarse grains contained in Nd-FeCo-Ga-B hot-pressed and die-upset magnets are examined. Coarse grains contained in hot-pressed magnets are found to maintain their shapes during die upsetting and to increase deformation resistance B/sub r/, H/sub k/, and (BH)/sub max/ of die-upset magnets decrease with increase in the…
The utility of the Vicat softening point is rationalised one step further. Light is thrown on Vicat measurements and they are interpreted from a qualitative viewpoint; it is stated that the Vicat softening point is nothing but a temperature at which the modulus has reached a particular level. So the Vicat softening po…
The present investigation of fiber-reinforced polymer matrix composites' impact characteristics employed a drop tower for the low-velocity impact case and a novel, projectile instantaneous velocity-measuring sensor for high-velocity impact. Attention was given to the energy loss of projectiles in composites reinforced…
Abstract Alloy cast irons are considered to be those casting alloys based on the iron-carbon-silicon system that contain one or more alloying elements intentionally added to enhance one or more useful properties. Alloy cast irons can be classified as white cast irons, corrosion-resistant cast irons, and heat-resistant…
Abstract Uranium is a moderately strong and ductile metal that can be cast, formed, and welded by a variety of standard methods. This article presents an overview of the processing and properties of uranium and uranium alloys with a brief overview of the principal hazards and precautions associated with processing dep…
A well-crystallized LaCrO3 powder with a primary particle size of about 1μm was synthesized through the complex precipitation process; obtaining the precipitate of complex hydroxide from an NaOH aqueous solution of Cr(NO3)3 by adding LaCl3 and then heating the precipitate up to 700°C. The LaCrO3 single-phased powder w…
The 50-Hz AC partial discharge (PD) triggered by a lightning impulse voltage of 1.2/50 mu s and breakdown characteristics under superimposed voltage conditions are studied for several modes of oil-immersed transformer insulation, representing typical combinations of mineral oil and oil-impregnated paper. It is conclud…
The corrosion resistance of zirconium in nitric acid is affected by concentration and temperature of nitric acid as well as applied potential. The purpose of this work is to study passivity and its breakdown of zirconium in high temperature nitric acid. (1) The polarization curve of zirconium in nitric acid was divide…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemplate-controlled oligomerization support studies. Template synthesis and functionalizationKen S. Feldman, John S. Bobo, Susan M. Ensel, Yoon B. Lee, and Paul H. WeinrebCite this: J. Org. Chem. 1990, 55, 2, 474–481Publication Date (Print):January 1, 1990Publication History…
The crystal structure of synthetic Ag 2 O · 2B 2 O 3 · 2H 2 O with the structural formula Ag 6 [B 12 O 18 (OH) 6 ] · 3H 2 O was determined from single-crystal X-ray diffractometer data. The compound crystallizes in the monoclinic space group P 2 1 / c with a = 1178.4(29) pm, b = 1065.4(16) pm and c = 1011.6(9) pm, β =…
Crystals of naproxen were modified by the spherical crystallization technique to improve the compression and flow characteristics of the drug substance. A naproxen:acetone solution was added to water, and the crystals were agglomerated with either hexanol, octanol, or toluene. The resulting agglomerates were compact s…
Compounds containing a viologen linked to a porphyrin via a number (n= 4–7) of methylene groups have been synthesized and photoinduced long-range electron transfer between porphyrin and viologen was observed. The photoexcited singlet state of the porphyrin was quenched by the bonded viologen in viologen-linked porphyr…
Abstract Copolyimides with siloxane moieties in the main chain were synthesized by solution polycondensation of 1,3‐bis(3‐aminopropyl) tetramethyldisiloxane (APMS), oxydianiline (ODA) with 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride (BTDA) in N ‐methyl‐2‐pyrrolidone (NMP). The adhesion properties between copoly…
Tantalum Boride powders were synthesized by the solid state reaction between tantalum and amorphous boron. Five Boride phases (Ta2B, Ta3B2, TaB, Ta3B4 and TaB2) were formed by heat treatment of the mixed powders at 1000°-1800°C for 0-120min. Formation behavior of these borides was dependent on the heat-treatment tempe…
In the course of severe light water reactor (LWR) core melt accidents, the formation and presence of water soluble compounds will affect the behavior of fission products in the primary system and in the containment. A liquid aerosol mixed with an insoluble component has an affinity to stick on surfaces. A relocation o…