Materials Literature
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To enable the simultaneous determination of both the speed and extent of liquid absorption in cotton fabrics, we have developed a radial, horizontal wicking experiment. The initial part of the absorbed mass versus time profile is linear, which allows us to determine the wicking rate. After a given time, a constant mas…
Although in recent years resonant optical nonlinearities in quantum confined silicon generated significant interest, no experimental work has been dedicated to the nonresonant regime, which is the range of interest for optical switching applications. In this article we report a systematic investigation on the differen…
Cu bicrystals with a ∑ = 19a {331} grain boundary, grown by the Bridgman technique, have been doped with 14, 24, 25 and 64 at.ppm Bi. After annealing between 500 and 800°C the segregation was quantified using energy-dispersive X-ray spectroscopy in a dedicated scanning transmission electron microscope. Grain-boundary…
To make a nondestructive measurement of tritium retained on/in materials surfaces, conversion efficiency of β-rays to characteristic X-rays in an argon atmosphere has been examined. For this purpose, various tritium-containing graphite plates were prepared at first by ion implantation. After the tritium implantation,…
Recently, we developed a new method for making spherical poly(α-methylstyrene) (PαMS) mandrels. The process utilizes a small amount (<0.1wt%) of high-molecular-weight poly(acrylic acid) (PAA) in the suspending medium, which substantially increases the interfacial tension during curing relative to methods using poly(vi…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
An innovative shielding concept to reduce radiated emissions from components and tracks on printed-circuit boards is proposed. The new shield is made of a polycarbonate foil, which is coated by a thin film of nickel (only 50 nm in thickness) and by a 5-/spl mu/m thick layer of tin, and successively thermoformed. The i…
The static and dynamic drape behavior of polyester Shingosen fabrics is investigated using the new mechanical parameter of dynamic drapability, that is, the dynamic drape coefficient with swinging motion D d . The D d of the Peach Face fabric is small and that of the New Worsted fabric is large. On the other hand, the…
This paper presents a model for predicting fabric drape profiles using polar coordinates. The drape coefficient (DC%), node locations, node numbers, and node shape in the fabric drape profile can be predicted accurately with this model. Polar coordinate fitting is used to determine the constants in the drape profile m…
Near 4-μm-thick Pb(ZrxTi1−x)O3 (PZT) films with Zr/Ti ratios of 60/40, 52/48, and 45/55 were coated onto platinized silicon substrates by using 2-methoxyethanol based sol-gel spin-on techniques with a special thermal treatment process. The scanning electron microscopy observations show the columnar growth of grains. T…
BACKGROUND AND PURPOSE: The diagnostic efficacy of gadobenate dimeglumine (Gd BOPTA) was compared with that of gadodiamide (Gd DTPA-BMA) in patients with primary malignant tumors or metastases of the brain. METHODS: A subset of patients was evaluated from the 410 enrolled in the United States in phase III central nerv…
Thermally unaltered conodont elements, brachiopods, and vertebrates were analyzed with reverse phase high profile liquid chromatography to locate and quantify amino acid remnants of the original organic matrix in the fossils. No consistent similarities in amino acid content were found in conodont taxa, and criteria ba…
A new ceramic processing method, thermoreversible gelcasting (TRG), has been developed. The method uses a gelation process that can be reversed multiple times. Two Al 2 O 3 systems have been explored with the use of a specific triblock copolymer to form a binding gel network. The mixture becomes a free‐flowing liquid…
The novel network polymers 2a-2d based on calix[4]resorcinarene derivatives were obtained with yields 2a:80%, 2b:90%, 2c:70%, 2d:70%. Polymers 2a and 2b containing fragments of tetramethylcalix[4]resorcinarene or tetraphenylcalix[4]resorcinarene as a repeating units were synthesized by condensation cis-tetramethylcali…
This study describes the biosynthesis of novel sulfur-containing polyhydroxyalkanoates (PHAs), which consist exclusively of hydroxypropylthioalkanoic acid containing thioether groups in the side chains. In addition, the utilization of alkylthioalkanoic acids (=thia fatty acids) by various bacteria was investigated. Ba…
The effect of seeding on the microstructure and mechanical properties of single‐phase Y‐α‐SiAlON ceramics with elongated grains has been studied. Seeds of the intended α‐SiAlON compositions but with different size, shape, and number of grains have been compared for their effects. The microstructure, resistance (R‐curv…
The magnetization of p-GaN or p-AlGaN/GaN superlattices was measured after implantation with high doses (3–5×1016 cm−2) of Mn, Fe, or Ni and subsequent annealing at 700–1000 °C. The samples showed ferromagnetic contributions below temperatures ranging from 190–250 K for Mn to 45–185 K for Ni and 80–250 K for Fe. The u…
We report on further experimental studies of the ac field response of transient and permanent gratings written with visible light in both planar and homeotropic, dye-doped liquid crystal cells. It is found that the diffraction efficiency of these gratings can be controlled by the applied ac field. High ac frequencies…
Through layer-by-layer assembly, a series of undecatungstozincates monosubstituted by first-row transition metals, ZnW11M(H2O)O (M=Cr, Mn, Fe, Co, Ni, Cu or Zn) were first successfully immobilized on a 4-aminobenzoic acid modified glassy carbon electrode surface. The electrochemical behaviors of these polyoxometalates…
Nanoparticles were synthesized using a modified aerosol decomposition process. The goal of this work was to investigate the breakup of micrometer/submicrometer particles into nanosized particles in salt microreactors using NiO synthesis as a model. The influence of various operating conditions such as temperature, typ…