Materials Literature
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Abstract A new Au11 cluster with (m-CF3C6H4)3P ligands has been synthesized and characterized by single crystal X-ray and XPS analysis. The cluster has an incomplete icosahedral skeleton similar to known Au11X3(PR3)7 clusters, but a stronger distortion from the ideal symmetry has been caused by introducing CF3 substit…
Summary The aqueous dissolution of synthetic brannerite (UTi 2 O 6 ) in an open atmosphere has been investigated. Previous data in the literature have been combined with new experimental work, dealing with the release of uranium from brannerite as a function of solution pH and aqueous carbonate species, in oxygenated…
Abstract Carbon black (CB) nanoparticles were encapsulated by poly(vinyl alcohol) (PVA) by a simple method of coacervation. Transmission electron microscopy (TEM) images clearly demonstrated that the successful encapsulation of PVA happened at the surfaces of CB nanoparticles. The particle‐size distribution measuremen…
A solid state diffusion method for the preparation of (K2 : Dy)Mg2(SO4)3 and (K2 : Dy,P)Mg2(SO4)3 phosphors is reported. Thermoluminescence (TL) and mechanoluminescence (ML) characteristics are studied. TL, shown by the (K2 : Dy,P)Mg2(SO4)3 phosphor is 60% as intense as the conventional CaSO4 : Dy phosphor used in the…
Abstract Lattice Monte Carlo simulations of conformations of hereroarm star copolymers A n B n in selective solvents were performed using a special variant of the Siepman and Frenkel algorithm. The effects of solvent quality, the number and lengths of blocks on the collapse of the insoluble block A, segregation of the…
This paper looks at the propagation characteristics of UHF signals in transformers for locating partial discharge sources
A sinter‐forging technique was successfully applied to fabricate a silicon nitride with a lutetia (Lu 2 O 3 ) additive. The sinter‐forged specimen had a strongly anisotropic microstructure where rodlike silicon nitride grains preferentially aligned perpendicular to the forging direction. The specimen exhibited superio…
The design of a compact Rotman (1963) type lens for wide angle scanning has been proposed. Equations to design the lens have been derived. The lenses designed using the proposed approach have been analyzed using the contour integral approach. Results of the analysis are in close agreement with the designed value.
Nonexchangeable potassium (K-ne), i.e. 1 M NH4OAc-nonexchangeable K, often contributes significantly to plant nutrition. However conventional extraction methods often extract much more K-ne than plants even after intensive cropping, suggesting the difficulty in evaluating the amount of readily available soil K-ne. In…
Different amounts (50-170 php--parts per hundred parts of EVA, 33-63 wt%) of two tackifiers (hydrogenated rosin ester, polyterpene resin) were added to an ethylene vinyl acetate (EVA) copolymer containing 28 wt% vinyl acetate. The EVA and the tackifier were characterized using infrared (IR) spectroscopy, DSC measureme…
The structure and elastic properties of a series of iron phosphate glasses are investigated using infrared reflectivity and ultrasonic pulse-echo measurements. The mid-infrared and far-infrared spectra give information about phosphate related vibrational modes and the nature of the bond between the metal cat-ion and i…
The rustling sounds of seven samples are recorded in order to determine the sound characteristics of polyester warp knitted fabrics according to construction type. Physical sound parameters (LPT, ΔL, Δf, ARC) and Zwicker's psychoacoustic parameters of loudness ( z), sharpness ( z), roughness ( z ), and fluctuation str…
Samples of quartz annealed at high temperatures are known to exhibit thermoluminescence (TL) properties which depend on the rate of cooling of the samples to room temperature. Powder samples of Arkansas quartz were annealed in air at temperatures between 500 and 900 °C and were cooled to room temperature at different…
A full-scale crash test of a prototype composite helicopter was performed at the Impact Dynamics Research Facility at NASA Langley Research Center in 1999 to obtain data for validation of a finite element crash simulation. The helicopter was the flight test article built by Sikorsky Aircraft during the Advanced Compos…
This paper describes the first reported occurrence of berlinite (AlPO 4 ) formed entirely under sedimentary conditions. Berlinite appears as grayish or colorless fine crystals in vacuoles and along cracks in heavily compacted, phosphate-rich sediments within the Cioclovina Cave in Romania. The X-ray powder diffraction…
David C Joy; Introduction to the Scanning Electron Microscope, Microscopy and Microanalysis, Volume 9, Issue S02, 1 August 2003, Pages 1556–1557, https://doi.or
Abstract Vermiculites and phlogopites can be exfoliated by chemical and thermal treatment methods to obtain chemically inert, adsorbent, fire-resistant, low-density materials with excellent thermal and acoustic insulation properties. The water content of the clay generally determines the extent of exfoliation and the…
In this paper, carbon-14 inventory of Wolsong Nuclear Power Plant (NPP) which has CANDU type reactors was estimated for 1984–2002. The carbon-14 inventory can be estimated based on a simple relation: [carbon-14 inventory]=[carbon-14 production]—[carbon-14 emission]. The second term can be calculated whereas the third…
Ultradisperse detonation diamond (UDD), a nanodiamond having particle size around 4 nm has been treated with ozone in an aqueous slurry. The reaction kinetics appeared to be relatively slow and long ozonation times were needed in order to functionalize the surface of a special nanodiamond sample with a very low degree…
ZnO films have been prepared on (0001) sapphire substrates by the sol-gel method from a 2-methoxyethanol solution of zinc acetate dihydrate stabilized by monoethanolamine. The structural properties of the films have been characterized by X-ray diffraction, compared with the films on silica glass substrates. The crysta…