Materials Literature
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Critical flow intensities expressed in terms of critical wall shear stresses for initiation of flow induced localized corrosion (FILC) at carbon steel under CO{sub 2} corrosion conditions (1 M NaCl, 5 bar CO{sub 2}, 80 C) were evaluated using the submerged jet impingement method. Flow independent pitting facilitates F…
The transmittance and reflectance of superconductive YBa2Cu307-δ (YBCO) thin films deposited on Si substrates have been measured in the far-infrared frequency region from 10 to 100 cm−1 (wavelength from 1000 to 100 μm) at temperatures between 10 and 300 K. The effects of interference, optical resonance, and antireflec…
Lactoferrin is an important member of the transferrin family. A characteristic property of transferrins is their ability to bind very tightly (K(app) approximately/= 10(20)) but reversibly two Fe(3+) ions. The structural consequences of binding a metal other than Fe(3+) have been examined by crystallographic analysis…
ABSTRACT Compressive properties of composite gels consisting of 13% whey protein isolate (WPI) and 10% to 30% selected milkfat fractions were investigated at different temperatures. Compressive properties of gels were significantly affected by melting properties of the filler. Maximum compressive strength of composite…
Enzyme I of the bacterial phosphoenolpyruvate:sugar phosphotransferase system can be phosphorylated by PEP on an active-site histidine residue, localized to a cleft between an alpha-helical domain and an alpha/beta domain on the amino terminal half of the protein. The phosphoryl group on the active-site histidine can…
Single crystals of Al 2 O 3 were implanted at a temperature of 25°C with magnesium ions that were accelerated at 200 keV and then annealed in oxygen gas for 15 h at 1500°C. The microstructure and composition in the implanted region were examined using analytical electron microscopy techniques, with an emphasis on iden…
Abstract Physical blends of nylon 6 (or nylon 66) homopolymer with random copolymers of nylon 6/nylon 66 or of nylon 6/nylon 12 were melt extruded into films and characterized by Differential Scanning Calorimetry (DSC) and X‐ray Diffraction (XRD) techniques. The films containing up to 50–65% of the copolymer exhibited…
Certain aspects of copper tube failure in drinking water systems are inconsistent with the “membrane cell theory” of copper pit propagation, which postulates that cathodic reactions occur immediately above the pit tubercle. To examine the basis for this theory, classic experiments of Lucey were revisited and alternati…
The ballistic performance of a 0 degrees /90 degrees ultra high molecular weight polyethylene (UHMWPE) composite was investigated. Two areal densities were considered: one for fragmentation protection and one for high velocity bullet protection. The role of microscopy in the post-failure analysis of the UHMWPE was exp…
Dendrimers having alternating aryl benzyl ether and tertiary amine generations and up to 16 bis(2-methoxyethyl)amine end groups and four internal tertiary amines were synthesized by sequential etherification, amidation of secondary amines, and LiAlH 4 reduction to tertiary amines. The bis(2-methoxyethyl)amine dendrime…
The electrochemical behavior of Fe and thin, sputter‐deposited films of in phosphate‐containing solutions was studied and compared with the behavior in borate buffer and 0.1 M NaOH. In situ X‐ray absorption near edge structure was used to simultaneously monitor changes in the samples' average valency and thickness. Th…
Sulfolobus solfataricus is a hyperthermophilic archaeon growing optimally at 80-85 °C. It metabolizes glucose via a novel non-phosphorylated Entner-Doudoroff pathway, in which the reversible C6 to C3 aldol cleavage is catalysed by 2-keto-3-deoxygluconate aldolase (KDG-aldolase), generating pyruvate and glyceraldehyde.…
Abstract In the present investigation X‐ray diffraction techniques, DSC and dynamic mechanical relaxation (DMR) methods have been employed to compare the structure and thermal behaviour of Kevlar (“DuPont”, USA) and Armos (Russia) fibers. Our recent studies have indicated that the non‐crystalline phase of copolyesters…
The moduli and flow diagram of the program SIR99 are described. New phasing algorithms are proposed working both in direct and in reciprocal space. Their cooperative work is able to solve the structures of both small and large molecules. In particular, small proteins can be solved ab initio without any use of prior in…
The thermotropic liquid crystal behavior of n -alkylammonium, N, N -dimethyl- n -alkylammonium, and quaternary N, N -dimethyl- N -cyanopropyl- n -alkylammonium poly(vinylsulfonate)s was investigated using differential scanning calorimetry, polarizing optical microscopy, and X-ray diffraction. All the hexadecyl and oct…
The optical dephasing, caused by vibrational modulation of interactions of optical centers with defects is studied. This mechanism is essential for crystals with a substantial amount of defects, being more efficient at low temperatures than the Raman mechanism, caused by scattering of acoustic phonons at optical cente…
A corrosion rate model is developed for carbon steel in water containing CO{sub 2} at different temperatures, pH`s, CO{sub 2} fugacities and wall shear stresses. The model is based on loop experiments at temperatures from 20--160 C. The data are taken from a database containing more than 2,400 data points at various t…
The development of lamellar morphology in poly(oxymethylene) (POM) and its miscible blends was studied by synchrotron time-resolved small-angle X-ray scattering (SAXS), during primary and secondary crystallization at temperatures near 150°C. The blends contained two different diluents: poly(vinyl 4-hydroxy styrene) [c…
A one‐dimensional mathematical model of a spirally wound lithium/thionyl chloride primary battery is developed and used for parameter estimation and design studies. The model formulation is based on the fundamental conservation laws using porous electrode theory and concentrated solution theory. The model is used to e…
In this paper, polyisobutylene succinic anhydride adduct (PIB-SA) was modified by esterification with polyethylene glycol (PEG 600, 1000 and 2000) to obtain mono- and diterminal polyoxyalkynated PIB-SA. The monoterminal products were reacted with pentamethylene-hexamine (PMHA). The structures were confirmed by FT–IR a…