Materials Literature
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This paper presents results of an analytical core loss calculation method developed for single phase and five limb three phase core types. Shown are calculation results of flux distributions, flux density waveshapes, spatial flux density curves and loss distributions in cores other than the 3 phase-3 limb core. The an…
This paper describes a study on the development of stainless steel/polyester knitted fabrics for electromagnetic shielding applications. To facilitate knitting of stainless steel wires and to reduce the material cost, initially blended yarns of staple stainless steel and polyester fibers were fabricated by using the r…
Dynamic compression tests were performed by means of a Split Hopkinson Pressure Bar (SHPB). Test materials were 2124Al alloys reinforced with 17% volume fraction of 3, 13 and 37 μm SiC particles, respectively. Under strain rate ε = 2100 l/s, SiC particles have a strong effect on σ 0.2 of the composites and the σ 0.2 i…
The first photophysical studies of a member of the family of subnaphthalocyanines are described. The cone-shaped unsubstituted subnaphthalocyanine, synthesized in 35% yield, provides it with distinctive photophysical properties that are better than those of the related planar phthalo- and naphthalocyanines. SubNc abso…
The equation of state of a dry foam with ideal gas in the bubbles, proposed by Ross, is proved. This equation suggests that a foam with a free boundary will expand to a maximum volume if the external pressure is lowered at constant temperature. The same foam enclosed in a container, on the other hand, can be expanded…
26. Diversity of Reactions Catalyzed by Heme-Thiolate Proteins. 27. Oxometalloporphyrins in Oxidative Catalysis. 28. Shape-Selective Oxidation by Metalloporphyrins. 29. High-Valent Iron and Manganese Complexes of Porphyrins and Related Macrocycles. 30. High-Valent Intermediates. 31. Metalloporphyrins in Catalytic Oxid…
Scleractinian skeleton is composed of mineral and organic phases. Using staining tech− niques (acridine orange dye) Johnston’s (1980) pioneering observations of intraskeletal organic envelopes in Pocillopora damicornis coralla can be extended to two other coral reef genera i.e., Acropora and Favia. The concept of biol…
SUMMARYThe influences of various pre-treatments of interest in adhesive bonding on the surface condition of 2024-T3 alloy have been examined. In particular, the morphologies of films formed during alkaline etching (NaOH), electropolishing (perchloric acid/ethanol), acid pickling (Na2Cr2O7/H2SO44 and anodzing (H3PO4),…
The behavior of crosslinked polyethylene (XLPE) for HV cable insulation under electrical stress is discussed in the paper, referring to specimens unaged and electrically aged. Polarization and space charge features are considered. The behavior of the examined insulation is evaluated through the 'universal' model for p…
The effect of hygroscopicity of the insulating unit of polymer composites on their response to relative humidity has been investigated. The composites examined were the poly( o ‐aminophenol) (PoAP&) composites with poly(vinyl pyrrolidone) (PVP), poly(acrylic acid) (PAA), poly(ethylene oxide) (PEO), and poly(methyl met…
The use of calcined Mg–Al hydrotalcite as an efficient catalyst for the selective O-alkylation of catechol with dimethyl carbonate (DMC) to guaiacol in a continuous fixed bed flow reactor is described. A maximum guaiacol yield of 80% is obtained at 573 K under optimized conditions with a stable catalytic activity. A c…
Fifteen highly regular hydrogen-bonded, novel thermotropic, aromatic-aliphatic poly(ester–amide)s (PEAs) were synthesized from aliphatic amido diols by melt polycondensation with dimethyl terephthalate and solution polycondensation with terephthaloyl chloride. Intermolecular hydrogen bonds more or less perpendicular t…
An unidentified phase X of 1,4-dialkyl-1,4-diazoniabicyclo[2.2.2]octane dibromides reported by Nogami et al. in 1985 was reinvestigated by differential scanning calorimetry, polarizing microscopy and temperature-dependent X-ray diffraction. The X phase was thus established as a smectic tetragonal (ST) mesophase which…
Anodic film growth has been undertaken on an electropolished Al‐3.5 wt % Cu alloy to determine the influence of copper in solid solution on the anodizing behavior. At the commencement of anodizing of the electropolished alloy, in the presence of interfacial enrichment of copper, and ions egress and ion ingress proceed…
A novel metalorganic route to small (ca. 2 nm diameter) InAs nanocrystals has been developed. The nanocrystals were analysed by a number of methods including HRTEM, photoluminescence and electronic spectroscopy. Distinct quantum size effects were observed in the optical properties, attributable to the nanoparticles ha…
The effect of irradiation on the structure of epoxidized (50 %) natural rubber (ENR50) has been studied using Fourier transform infrared spectroscopy (FTIR). ENR50 was irradiated using a 3.0 MeV electron beam machine with doses ranging from 20 to 200 kGy. The influence of several additives such as trimethylolpropane t…
In order to improve blood compatibility, the surfaces of polyethylene terephthalate (PET) were treated using CO2 pulsed and KrF excimer lasers. The physico-chemical characterization of the laser-treated PET surfaces was carried out through attenuated total reflectance infrared spectroscopy and contact-angle measuremen…
An experimental study of the thermal transition behavior and blend miscibility of hydrogenated acrylonitrile-butadiene rubber (HNBR) is described. Glass transition temperatures were determined as a function of composition. It was found that copolymers in the 40–50% composition range crystallized as did low acrylonitri…
Two types of dendrimers with a 1,3,5-triazine ring at the branch point were synthesized by divergent and convergent methods. The divergent method began with 2,4,6-tris(p-nitroanilino)-1,3,5-triazine as a trifunctional core. Each cycle involved the reduction of the peripheral NO2 group followed by a reaction with 2-chl…
Polytetrafluoroethylene sheet samples have been treated in a low-power plasma cell using O2, Ar, N2 and NH3 feed gases. The surfaces became significantly more wettable in simulated body fluid and bromonaphthalene. By using a range of techniques, this was found to be principally due to chemical changes at the surface i…