Materials Literature
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Novel polyazomethines containing cycloalkanones or pyridine moieties were synthesized by the polycondensation of 2,5-bis(m-aminobenzylidene)cyclopentanone (BMAP, IV), 2,6-bis(m-aminobenzylidene)cyclohexanone (BMAH, V), 2,6-bis(p-aminobenzylidene)cyclohexanone (BPAH, VI), and 2,6-bis(m-aminostyryl)pyridine (BMAS, VIII)…
The coexistence of phases in WO3 ceramics sintered within the 600–1000 °C temperature range is investigated using Raman microprobe spectroscopy. The analysis of vibrational modes indicates the existence of triclinic (VI) P1 and monoclinic (V) P21/n phases mixing. The concentration ratio between WO3 microcrystals in th…
The synthesis of new inorganic materials constructed with extended lattices has taken place mainly in two areas, complex oxides and porous framework structures. In the former case the drive has been towards controlling electronic and magnetic properties while in the latter domain porosity and the ability to enclathrat…
Crystal structures of double calcium and alkali metal phosphates described by the general formula Ca 10 M (PO 4 ) 7 ( M = Li, Na, K) have been studied by the Rietveld method. The lattice parameters are a = 10.4203(1) and c = 37.389(1) Å (for M = Li), a = 10.4391(1) and c = 37.310(1) Å (for M = Na), and a = 10.4229(1)…
The linear electro-optic (E-O) coefficients of poled 0.88Pb(Zn 1/3 Nb 2/3 )O 3 –0.12PbTiO 3 single crystal were characterized using an automated scanning Mach-Zehnder interferometer and the senarmont compensator method at room temperature. They were obtained at a wavelength of 632.8 nm: r 33 =134 pm/V, r 13 =7 pm/V, r…
A transient thermoreflectance technique, using a 200-fs laser pulse, is demonstrated as a nondestructive method for measuring the thermal boundary resistance between a thin metallic film and dielectric substrate. Experimental results are presented for Au deposited on silicon and silicon dioxide substrates taken at roo…
This paper presents a review of the current state of the art of transport models for charring solid degradation. Both cellulosics and synthetics are examined. Advanced solid-phase models, taking into account multi-step primary and secondary reactions and transport phenomena, are available for the first class of materi…
This paper presents results of a rigorous analytical study performed in order to understand the role which joints play in determining the performance of cores of power and distribution transformers. The paper presents the details of the magnetic flux distribution and redistribution in the core joint region along the c…
Hardware for use on HV systems is designed to be corona free. Recent hardware design activity has been centered around attempts to increase the corona onset voltage by optimizing the electric field distribution on its surface. Corona onset, however, is not only a function of the surface electric field, but also its ra…
Structure-property relationships of injection- and compression-molded microfibrillar-reinforced PET/PA-6 blends with different weight ratio of the components have been studied. The blends were prepared by melt mixing using a single-screw extruder. Thermal, X-ray (WAXS), morphological, and static mechanical studies of…
The X-ray structure, magnetic susceptibility, and high-field (high-frequency) EPR spectrum of manganese 5,10,15-tris(pentafluorophenyl) corrole unambiguously establish that the complex contains an isolated, slightly rhombic, manganese(III) center.
To better understand the decrease in storage capacity of alloys in rechargeable Ni/MH batteries undergoing repeated charge/discharge cycles, the corrosion of a alloy in aqueous KOH electrolyte was studied. The crystal structure, chemical composition, and distribution of corrosion products were characterized by X‐ray d…
Aziridinyl phosphazene (NPAZ) was introduced to aqueous-based polyurethane (PU) as a flame retardant and a postcuring agent, mainly because of the presence of phosphorus compositions, as well as the reactive aziridinyl groups on NPAZ. This dual-function NPAZ was prepared from the substitution reaction of hexachlorocyc…
Endothelial cell seeding, a promising method to improve the performance of small-diameter vascular grafts, requires a suitable substrate, such as crosslinked collagen. Commonly used crosslinking agents such as glutaraldehyde and formaldehyde cause, however, cytotoxic reactions and thereby hamper endothelialization of…
An historical review is given on the effects of neutron irradiation on the microstructure and properties of Zircaloy. Topics included are basic neutron damage structure, precipitate instabilities, irradiation growth, deformation and mechanical properties, and corrosion. A personal perspective is given by the author, a…
In food packaging applications where low-density polyethylene (LDPE) film containing α-tocopherol is used, the antioxidant may have a dual function, i.e. to protect the polymer from oxidative degradation during processing, and to delay the onset of oxidation of the packaged foodstuff during storage. Incorporation of h…
To date, few researchers have solved three-dimensional free surface problems with dynamic wetting lines. This paper extends the free surface finite element method (FEM) described in a companion paper [Cairncross RA, Schunk PR, Baer TA, Sackinger PA, Rao RR. A finite element method for free surface flows of incompressi…
In this article we report on some surprising, and we believe new, findings regarding the factors affecting the optical properties (haze) of polyethylene blown and cast films. A comprehensive investigation of blown and cast films made from conventional Ziegler-Natta catalyzed linear low density polyethylene (LLDPE) as…
The idea recently spread in the literature that the β-relaxation originates from cooperative motions in the glassy state is analysed. The results obtained by two different dielectric techniques, dielectric relaxation spectroscopy (DRS) and thermally stimulated depolarisation currents (TSDC), are compared and, from thi…
Low-carbon weld metals with various amounts of Mn and Ni addition were made using metal-cored wires and Ar–2%O2 shielding gas, and their mechanical properties were evaluated. The objective of the research, aimed to develop welding consumables with better resistance to cold cracking, was to determine the optimum compos…