Materials Literature
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As one of the difficult-to-machine materials, austempered bainitic spheroidal graphite cast iron (FCD 1000 A) have been machined so far only by grinding. In the present study, cutting of the FCD 1000 A was tried using CBN tools. Cutting performance of the tools was investigated through determining the optimum combinat…
A lead-based relaxor material for multilayer ceramic capacitors was ground by ball-milling with partially stabilized zirconia balls of 1, 3 and 15mm in diameter and the effects of ball size and particle size of powder on milling rate were studied. Particle size distribution and specific surface area of powders were ex…
Nanofibers are solid state linear nano materials characterized by high surface area to volume ratio. These materials attracted the attention of researchers due to enhanced micro and nanostructural characteristics. \nElectrospinning has been found as straight forward and viable technique to produce nanofibers. In t…
A double ion exchange method permits pillaring of the layered vanadium pentoxide xerogel with Al13 oxyhydroxide polymers and a single ion exchange permits pillaring it with Mo6 and Nb6 polynuclear cations.
α-Acetoxystyrene (ACOST) undergoes radical polymerization in contrast to α-methylstyrene. However, the polymerization is a slow equilibrium process with a ceiling temperature (Tc) of 47°C at 1mol/L. Poly(α-acetoxystyrene) (PACOST) possesses a tertiary benzylic carbon adjacent to an ester oxygen in its backbone and is…
Mechanical experiments on thin threads in discotic liquid crystal are described. Thread resonance under oscillating electric field excitation allows the measurement of the surface tension. Buckling instabilities are observed under mechanical compression and also under magnetic field. All these effects, dominated by su…
Enprofylline, a drug without adenosine antagonism and theophylline, a potent adenosine antagonist, were compared, double-blind, randomized, in acute asthma (n = 33). The drugs were given intravenously as loading over 10 min followed by maintenance infusion for 24 h. Mean final plasma levels were very high with enprofy…
Uniform oxidation is the most common type of corrosion of copper tubes in heat-exchanging refrigerating and air-conditioning units. Recently an unusual type of corrosion, “ant nest corrosion”, has been reported in such copper tubes at the final leakage test before shipment or a short time after installation. The corro…
Octaarylporphyrins were obtained in high yields by cyclization of 3, 4-darylpyrrole with formaldehyde and subsequant DDQ oxidation. The reaction intermediates identified as porphyrinogen and porphodimethene have been characterized spectroscopically.
La morphologie de particules de platine supportes sur l'alumine a t tudie avant et aprs la combustion catalytique du mthane en combinant des mesures de nanodiffraction et de microscopie lectronique par transmission. En fonction des conditions de prparation du catalyseur, la structure de l'alumine est, soit fortement d…
The dynamic mechanical properties of bromobutyl rubber vulcanizates loaded with varying proportions of highly reinforcing carbon black (N-220) have been studied over a wide range of static extensions, using a viscoelastometer Rheovibron DDV-III-EP. The static strain and frequency range were 0–300% and 3·5–110 Hz, resp…
In order to withstand high excitation power density for the long operational lifetime required, preparation processes have been improved to reduce the deterioration of the luminescence efficiency of P-53 phosphors due to electron bombardment. The effects of several factors on the luminescence efficiency and the resist…
2014 La microscopie haute rsolution, la diffraction X sur poudres et sur monocristal ont t utilises pour caractriser les phases formes par ractions l'tat solide dans le systeme UO2 - MoO2 -MoO3 -WO3. Quelques phases sont dcrites comme des membres d'une srie homologue construite avec des feuillets de diffrentes paisseu…
Two examples of triptycene-based epitaxygens, in which aliphatic chains and aromatic cores form symmetry compatible lamellar lattices, have been synthesized and their mesomorphic properties have been studied.
With ternary Ni-40at%Co-X alloys the solid-solution hardening (ssh) due to solutes X of transition-metal group (TM) elements like Ta and Nb and of B-subgroup (B) ones like Sn and Al was investigated. The results were compared with the previous study on the ssh of pure Ni. The value of ssh, Δσ, for a solute X in the Ni…
Recently a new family of flexible mesogens has been described namely hexa-alkylated derivatives of cyclotetraveratrylene. We have functionalized these compounds, obtaining monofunctionalized and bifunctionalized derivatives with heptyloxy side groups. A model dimer and polycondensates were synthesized. Calorimetric da…
ASTM Subcommittee G01.05 on Laboratory Corrosion Tests currently has nine task groups working on the development of new standards and revisions of its existing 13 standards. Revisions to existing test methods and practices often have been overlooked, resulting in confusion regarding compliance with the standards. This…
The electron microscope has brought over the last fifty years a wealth of information about the structure of solids, from surface topography to the details of atomic arrangements. Like any probe, however, the electron beam is subject to the epistomological constraint that the investigator inevitably perturbs what is b…
Abstract A protocol for semi-quantitative XRD analysis of fly ash has been applied to 178 ashes in studies of the typical mineralogy of high-calcium and iow-calcium fly ash, the consistency of fly ash mineralogy from a typical power station, the partitioning of chemical constituents into crystalline phases, and the cr…
Most of the underground distribution cable in use in the United Kingdom is insulated by windings of paper tape which are impregnated with compounds of oil, wax and resin, in various proportions. The structure of this type of insulation is expected to deteriorate with time so that, even if the cable is mechanically und…