Materials Literature
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Rare-earth-metal ions (Pr 3+, Sm 3+, Eu 3+, Tb 3+, Dy 3+, and Er 3+ ) doped in KLaNb 2 O 7 with a layered perovskite structure showed photoluminescence by excitation of the two-dimensional host at 77 K. Dy 3+ - and Er 3+ -doped KLaNb 2 O 7 showed the luminescence of both rare-earth-metal ions and host. In contrast, Pr…
Abstract Sulfur cured SBR elastomers, devulcanized by high power ultrasonic irradiation, were revulcanized by using the same curing conditions as for virgin SBR. Crosslink density and gel fraction of virgin, devulcanized, and revulcanized elastomers were measured. Curing behavior of some model compounds based on virgi…
The mechanism of stain formation in the chemical etching reaction of silicon has been investigated in HF–oxidizing agent–H2O solutions. The chemical formula of the stain formed during the silicon etching reaction is K2SiF6. The concentration of holes on silicon surface increases with the increase of redox potential an…
In order to follow the insulator to conductor transition in a polymer when it is subject to a progressive degradation process, we have irradiated about 50 samples of poly(imide) Kapton with heavy ions and measured their conductivities as functions of temperature, electric field, and frequency. Electron spin resonance…
Synthesis of the phase formerly reported as Ba(5)Ga(6) succeeds only in the presence of hydrogen. The heavy atom structure of Ba(5)Ga(6)H(2) has been redetermined by single-crystal X-ray diffraction (trigonal P3c1, Z = 2, a = 7.7698(2) Å, c = 14.3902(7) Å), and the hydrogen positions have been elucidated by time-of-fl…
A model graft copolymer that has well-defined length, number, and position of grafts was prepared via anionic living polymerization. (4-Vinylphenyl)dimethylvinylsilane (VS) was anionically polymerized by cumylcesium in THF at −78 °C for 20 min under a pressure of 10 -5 mmHg, and subsequent addition of styrene (St) yie…
Poly(amidoamine) (PAMAM) dendrimers, generations 1 − 6, were peripherally modified with cationically substituted naphthalene diimide groups. Several monomeric diimides were also prepared as models. The structure and loading of the dendrimers were determined by vis, IR, and NMR spectroscopies, elemental analysis, and c…
The fluorescence of six secondary arenedicarboxamides has been investigated in single crystals, powders, melts, and ethanol solution. Single crystals of four rodlike arenedicarboxamides which pack in one-dimensional tapes display dual emission attributed to excited-state monomers and dimers. These tapes have a constan…
This paper addresses the development of the image analysis technique of flow field analysis to evaluate local orientation in a fibrous assembly. The algorithms are evaluated using simulated images presented in Part I of the series. The results are compared with those from the tracking and Fourier methods presented in…
Bipolar conducting polymers, in which both hole transport and electron transport contribute to electronic conductivity, have been explored by chemical template synthesis of p-type polypyrrole (PPy) in the matrix of an n-type conjugated ladder polymer, poly(benzimidazole−benzophenanthroline) (BBL). Transmission electro…
The precipitation reaction between aminotri(methylenephosphonic acid) (ATMP), a phosphonate used for scale prevention in high-water-volume industrial processes such as petroleum production, and calcium was systematically studied. By varying the precipitating conditions, three distinct precipitates formed: a crystallin…
End-anchored macromolecules admixed to a homogeneous monodisperse planar brush and differing from the majority brush-forming chains only by molecular mass take three different types of conformation, depending on its polymerization index, K, relative to that of the majority chains, N . The fraction of the admixed macro…
Introduction Fundamentals of Periodic Processes General Overview of SBR Applications Design of Activated Sludge SBR Plants Equipment and Instrumentation Practical Experiences Evaluation of SBR Facilities in Australia Evaluation of SBR Facilities in the USA and Canada Evaluation of SBR Facilities in Germany Evaluation…
Poly(D,L-lactide)–poly(ϵ-caprolactone)–poly(ethylene glycol)–poly(ϵ-caprolactone)–poly(D,L-lactide) block copolymer (PLA–PCL–PEG–PCL–PLA) was prepared by copolymerization of ϵ-caprolactone (ϵ-CL) and D,L-lactide (D,L-LA) initiated by potassium poly(ethylene glycol)ate in THF at 25°C. The copolymers with different comp…
Abstract Fe III mimochrome I is the prototype of a new class of hemoprotein models characterized by a covalent helix–heme–helix sandwich. It contains deuterohemin bound through two propionyl groups to two identical N ‐ and C ‐terminal protected α‐helical nonapeptides, each of which bears a His residue (a potential axi…
An algorithm is described for reconstructing a symmetric three-dimensional image from its Fourier intensity that is sampled below the Nyquist rate. The study is motivated by an image reconstruction problem in macromolecular x-ray crystallography. Application of the algorithm to simulated crystallographic problems show…
Ab initio calculations (DMOL method) including the estimate of the total energy and the full optimization of the geometrical parameters have been used to study the electronic structures and the coordination geometries of the model systems [{P(CH(2)CH(2)PH(2))(3)}M(H)(L)](+) (M = Fe, L = H(2), C(2)H(4), CO, N(2); M = R…
D-glucosamine-containing glycopolymers with well-controlled structure were synthesized by living cationic polymerization. To this end, D-glucosamine-containing vinyl ether (VE) of the type [CH2()CH(OCH2CH2OR)] was prepared, where R denotes a 3,4,6-tri-O-acetyl-2-deoxy-2-phthalimide-β-D-glucopyranoside, i.e., the hydr…
Maltose metabolism in Lactococcus lactis involves the conversion of beta-glucose 1-phosphate to glucose 6-phosphate, a reaction which is reversibly catalysed by a maltose-inducible and glucose-repressible beta-phosphoglucomutase (beta-PGM). The gene encoding beta-PGM (pgmB) was cloned from a genomic library of L. lact…
The recession rates for 10 ‐6 ‐m‐thick C interfaces in chemical vapor infiltrated SiC reinforced with Nicalon fibers were calculated from thermogravimetric data, assuming all of the mass losses were due to C oxidation, and found to be consistent with the measured recession distances of the C interface, which were surp…