Applied Methods of Structural Reliability.
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Materials Literature
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Reactions of Ground Magnesium Limestone and Gypsum in Soils with Variable‐Charge Minerals
Abstract Ultisols and Oxisols in Malaysia are characterized by low pH and high Al, with their subsoils usually deficient in Ca, Mg, or both. An experiment, using polyvinyl chloride columns, was conducted to study chemical reactions in a representative Ultisol and Oxisol from Malaysia resulting from application of grou…
Characterisation of the acidity of well defined Cu-ZSM-5 catalysts using pyridine as a probe molecule
The acidic sites in Cu/ZSM-5 catalysts active for the reduction of nitrogen oxides under lean conditions have been investigated by examination of the IR spectrum of adsorbed pyridine: proton and sodium forms of the zeolite have also been studied to provide reference results. As expected, H-ZSM-5 exhibited both Lewis a…
Nuclear magnetic resonance studies of neutral lanthanide(III) complexes with tetraaza-macrocyclic ligands containing three phosphinate and one carboxamide co-ordinating arms
Novel, neutral EuIII, GdIII and YbIII complexes have been obtained with tetraaza-macrocyclic ligands containing three phosphinate and one carboxamide co-ordinating arms. The overall results are consistent with a co-ordination geometry based on the octadenticity of these ligands. Among the possible 16 enantiomeric pair…
Effect of Dehydration on the Formation of Levofloxacin Pseudopolymorphs.
Differential scanning calorimetry (DSC) curves of levofloxacin hemihydrate measured under various conditions showed different thermograms. These phenomena were attributed to be the dehydration. Dehydration caused a multiple-phase transition. Dehydration at a higher temperature (above 70°C) gave a sharp endothermic pea…
Neural network prediction of glass-transition temperatures from monomer structure
Our goal is to establish the applicability of artificial neural networks to the prediction of physical and mechanical polymer properties from their monomer structures alone. We demonstrate their ability to predict, quickly and accurately, the glass-transition temperatures (Tg) of linear homopolymers. A variety of mult…
Amphiphilic terpyridine complexes of ruthenium and rhodium displaying lyotropic mesomorphism
New 4′-alkyl-substituted 2,2′:6′,2″-terpyridine (4′R-terpy) compounds have been synthesised from 4′-methyl-2,2′:6′,2″-terpyridine and an appropriate 1-bromoalkane and complexed with ruthenium and rhodium to yield new bis(terpyridine) complexes [Ru(terpy)(4′R-terpy)]2+(R = C19H39 or C31H63) and [Rh(terpy)(4′R-terpy)]3+…
Simulation of Micro-/Macrosegregation during the Solidification of a Low-alloy Steel.
A model for the solidification of multicomponent steels is presented and used to simulate the solidification of an austenitic steel. Assuming stationary solid phases, conservation of multiple species is considered simultaneously with the solution of the energy and Navier-Stokes equations, with full coupling of the tem…
Synthesis and Some Properties of Al<sub>4</sub>SiC<sub>4</sub>
The synthesis process and the formation mechanism of Al4SiC4 were investigated using Al, Si, and C as starting materials. Properties such as hydration resistance of the synthesized Al4SiC4 were examined. SiC and Al4C3 begin to form from about 800°C and 900°C, respectively. When the temperature is above 1300°C, both pr…
Reaction Sequences in Atmospheric Corrosion of Zinc
Frequent phase identifications of a large number of zinc panels exposed to different atmospheric conditions, both in national an international exposure programs, have revealed a variety of corrosion products. In order to extract basic information about the atmospheric corrosion processes involved, emphasis has been pl…
Atmospheric Corrosion
Description This comprehensive publication presents 16 international papers on atmospheric corrosion and corrosion testing. Provides an understanding of atmospheric corrosion concerns from the standpoint of economics, safety, and aesthetics, and what is being done about them on four continents. Topics include: • Corro…
Polymorphic Transitions of Amylose‐Ethanol Crystalline Complexes Induced by Moisture Exchanges
Abstract Vh‐type crystals were prepared by precipitation in pure alcohol of amylose solutions in dimethyl sulfoxide (DMSO). The respective influences of amylose chain length and final equilibrium relative humidity (E.R.H.) on the nature of transitions induced by moisture exchanges were studied extensively using X‐ray…
Performance blends based on recycled polymers
Abstract The recent growth in the post‐consumer recycling of plastics presents an opportunity for developing new, value‐added blend products from the recycled polymers. However, in order to develop blends with useful performance characteristics, suitable techniques of compatibilization and impact modification must be…
Optical properties of neodymium and dysprosium doped hybrid siloxane–oxide coatings
Hybrid organic–inorganic nanocomposites made of metal oxo-polymers (zirconium and neodymium oxo or dysprosium oxo species) linked to siloxane species [(CH3)Si–Oz.frac32;] exhibit luminescence. At low rare-earth-metal (M = Dy, Nd) concentrations, the emission lifetime is mainly governed by energy-transfer processes bet…
Are nonreciprocal bi-isotropic media forbidden indeed?
Doubt is cast in this article on the universality of the conclusion that linear bi-isotropic media have to be reciprocal, which claim has recently been set forth by Lakhtakia and Weiglhofer (see ibid., vol. 42, no. 9, p. 1715-6, 1994).>
Mechanism of B2-B19-B19′ Transformation in Shape Memory Ti–Ni–Cu Alloys
Martensitic transformations which occur in Ti-45.5Ni-5.0Cu and Ti-44.0Ni-5.0Cu-1.0Al (at%) alloys were investigated by means of electrical resistivity measurements, X-ray diffraction analysis and transmission electron microscope observation. It was found that both the two alloys transform in two steps on cooling, i.e.…
Research on Metastable Structures Using High Energy Ball Milling at North Carolina State University (<I>Overview</I>)
This paper reviews the research of the author’s group at North Carolina State University over the last ten years in the field of metastable materials prepared by mechanical attrition. A brief historical perspective of the author on the beginnings of this sub-field is presented. Much of the research discussed is devote…
Regioselective acylation of anisole with carboxylic acids over HZSM-5 catalyst
Over a HZSM-5 catalyst, the liquid-phase acylation of anisole with carboxylic acid gave the phenyl carboxylic ester at lower temperatures (< 403 K) while at higher temperatures (> 423 K) 4-acyl anisole was the predominant product.
Completeness profiles of one-electron basis sets
The completeness profile is used to provide a visual assessment of the quality of one-electron basis sets. The approach is illustrated by examples of a number of basis sets for the carbon atom. New insight is gained regarding the superiority of spin density calculations using Chipman's basis sets. Keywords: One-electr…
GENERAL DYNAMIC MATHEMATICAL MODELING OF HETEROGENEOUS ZIEGLER-NATTA AND METALLOCENE CATALYZED COPOLYMERIZATION WITH MULTIPLE SITE TYPES AND MASS AND HEAT TRANSFER RESISTANCES
Homogeneous and heterogeneous Ziegler-Natta catalyzed copolymerizations are described by a novel dynamic mathematical model that considers the presence of multiple catalytic site types and mass and heat transfer effects on polymerization rate and polymer properties. Soluble catalysts are regarded as a special case of…