Materials Literature
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Short regularly spaced repeats (SRSRs) occur in multiple large clusters in archaeal chromosomes and as smaller clusters in some archaeal conjugative plasmids and bacterial chromosomes. The sequence, size, and spacing of the repeats are generally constant within a cluster but vary between clusters. For the crenarchaeon…
Effect of different calcium doping levels on the microstructure of high‐purity α‐alumina was studied as a function of sintering time and temperature using scanning electron microscopy (SEM). Microstructural evolution was related to hypothetical calcium excess at the grain boundaries (Γ Ca ) that was calculated assumin…
The dynamic characteristics of steel fibre reinforced concrete (SFRC) have been obtained through 75 mm diameter split Hopkinson pressure bar (SHPB) tests. In order to understand the intrinsic dynamic behaviour of the material, this paper reviews the SHPB testing technique, and presents the principles and limitations o…
Abstract The voltammetric behavior in alkaline solution of a nickel‐based chemically modified electrode (poly‐Ni(II)curcumin) prepared by oxidative electropolymerization of nickel‐curcumin complex for electrooxidation of aliphatic alcohols was investigated by cyclic voltammetry and rotating disk technique (curcumin=1,…
The double-decker lutetium(III) phthalocyanine [( C 6 H 13 S ) 8 Pc ] 2 Lu was investigated by electrochemical and spectroelectrochemical methods and comparisons made to previously investigated [( C 12 H 25 S ) 4 Pc ] 2 Lu and ( Pc ) 2 Lu under the some experimental conditions. All three compounds undergo a single rev…
It is known that space charge is formed in cables insulated with crosslinked polyethylene. It is probable that the crosslinking byproduct or the crosslinked polymer morphology is responsible for the space charge. In order to examine the former possibility, an additive-free low-density polyethylene sheet was soaked in…
The inhibition efficiencies of benzotriazole (BTA) and tolytriazole (TTA) on copper in deionized water were investigated. The inhibition effects of BTA and TTA were evaluated from polarization curves. Coupon tests established that the inhibition efficiency was concentration, temperature, and time-dependent. Effective…
Sol−gel boehmite was aged under hydrothermal conditions at 200 °C using water as mineralizer agent. Samples were characterized with X-ray powder diffraction, nitrogen adsorption, and transmission electron microscopy. Calcined solids were also studied by infrared spectroscopy of adsorbed pyridine. Their catalytic prope…
Isothermal oxidation tests in flowing steam were performed on low-Sn Zircaloy-4 cladding tubes over the wide temperature range from 773 to 1,573 K in order to obtain oxidation kinetics applicable to various loss-of-coolant accident conditions of LWRs. The oxidation generally obeys a parabolic rate law for the examined…
Abstract The formation of polymer films produced by the phase separation process occurring when a cast poly(etherimide)/N‐Methyl‐2‐Pyrrolidone solution was exposed to humid air was studied. It was found that above a relative humidity value of 27%, the films presented a cell‐like structure. The size of the cells was sh…
Abstract An aliphatic/aromatic copolyester, poly(butylene succinate‐ co ‐terephthalate) (PBST), was prepared to investigate the effect of the aromatic units on the enzymatic degradation of the poly(butylene succinate) (PBS) derivatives in the presence of a lipase originated from Pseudomonas cepacia (Lipase PS®). The d…
Abstract The effects of sub‐ppm levels of nitrogen dioxide and hydrogen sulfide, and the adsorbed water on the corrosion of silver were studied in order to get a better understanding of the atmospheric corrosion process. An in situ mass balance was taken to monitor the kinetic behavior and the surface and the corrosio…
High-pressure/high-temperature conditions of 8 GPa and 1000°C were used to synthesize the new rare earth oxoborates RE 4 B 6 O 15 (RE = Dy, Ho) in a Walker-type multianvil apparatus. The single crystal X-ray structure determination of Ho 4 B 6 O 15 revealed the following data: C2/c, a = 1164.1(1), b = 436.7(1), c = 18…
Two types of thermal control materials developed for space use are described. These new materials use a variable emittance radiator called the smart radiation device (SRD). The SRDs are based on La 0.82 Sr 0.175 MnO 3 and La 0.7 Ca 0.3 MnO 3 and comprise a thin and light ceramic tile. The materials undergo a metal-ins…
Confined liquids can have properties that are poorly predicted from bulk parameters. We resolve with 0.5 nm resolution the nanoscale perturbations that interfaces cause on fluidity, in thin 3-methylpentane (3MP) films. The films of glassy 3MP are much less viscous at the vacuum-liquid interface and much more viscous a…
A one-pot, soft-chemistry, surfactant-assisted co-assembly approach to prepare La(1-x)Sr(x)MnO(3) (LSM)/Y(2)O(3)-stabilized ZrO(2) (YSZ) nanocomposites for use as solid oxide fuel cell (SOFC) cathodes has been investigated. This material with sub-hundred nanometer grain sizes for each phase is the first such nanocompo…
The relation of space charge-derived quantities with aging stresses and time is discussed in this paper. Polyethylene-based materials, aged for different times under electrical and/or thermal stress, are subjected to space charge measurements. Quantities are derived, that is, the threshold for space charge accumulatio…
Elastic effects can have a pronounced effect on the phase-separation process in solids. The classical Ginzburg—Landau energy can be modified to account for such elastic interactions. The evolution of the system is then governed by diffusion equations for the concentrations of the alloy components and by a quasi-static…
A mathematical model for simulating flow fields in porous textiles with consideration of gravity is described in this article. The article focuses on the analysis of the physical model of liquid diffusion in porous textiles. The model assumes that the liquid water moves in the composite network of capillaries of the p…
ABSTRACT This work deals with the hypothesis that kinetic parameters for nonisothermal processes can be reliably obtained using a 1‐step method. Parameters were estimated for 3 typical processes: (1) no residence time distribution (RTD), (2) first‐order reaction with RTD, and (3) n th‐order reaction with RTD. When non…