Materials Literature
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The structure of lead-silicate glasses, although being investigated for over sixty years, remains still controversial. One of the open questions is the structure of the lead subsystem: what are the basic structural units like, and how are they interconnected. In the literature the appearance of [PbO 4 ] n , or [PbO 3…
We have constructed a simple and sensitive tool for the measurement of magnetostriction of thin films. This tool is based on a commercial nano-indentation system, which enable the measurement of the elastic properties of small samples, such as thin films and precipitates, as well as the magnetostrictively induced defl…
The technique of domain visualisation, revealed by a film of nematic liquid crystal (NLC) on a ferroelectric crystal substrate, is demonstrated for the first time to be applicable to thin films of lead zirconate-lead titanate (PZT) ferroelectric ceramics. PZT film thicknesses <1 µm were deposited on indium tin oxide c…
Nickel(II)-meso-octaethylporphyrinogen dianion behaves as a π-extended ligand binding four M(CO)3 [M = Cr, Mo] fragments at the periphery, so that the porphyrinogen can assemble five metal centers around itself.
Initialization, which is to erase the non-uniform surface potential of an insulator, is important for reproducible observation and interpretation of the contrast mechanism of negative charging. When primary electrons with an accelerating voltage (whose secondary emission yield is larger than unity) irradiate the surfa…
This paper describes a novel process called “Dot Matrix Hardening” as applied to Ol, D2 and AISI 4340 steels. This process uses a pulsed laser (particularly an Nd:YAG laser) to create a uniform distribution of transformation-hardened spots to cover only a certain percentage of the desired surface. Due to significantly…
We derive a microscopic expression for the dielectric susceptibility $\ensuremath{\chi}$ of a Coulomb glass, which corresponds to the definition used in classical electrodynamics, the derivative of the polarization with respect to the electric field. The fluctuation-dissipation theorem tells us that $\ensuremath{\chi}…
We improved the imbedded fiber retraction (IFR) method as a simple method to obtain the interfacial tension between polymer melts. A force balance equation for a fiber in an immiscible matrix by Cohen and Carriere is solved for a more realistic fiber shape at later stage of retraction. Moreover, unknown hydrodynamic c…
Two different types of hybridized siliconized epoxy matrix systems have been developed using two commercially available (CIBA-GEIGY) epoxy resins with hydroxyl terminated polydimethyl siloxane. The percentage siloxane content in the epoxy systems have been optimized based on the physico-chemical, electrical, mechanica…
Ab initio band structure calculations on some compounds with either hexagonal or triangular nets in their crystal structures are presented. The view taken is that electronic instabilities as manifested in certain visualisations of the electronic structures can be indicative of the presence of interesting ground states…
By means of conventional fabric-properties tests, the sweating-copper-mannequin test, and wearer trials, the wet comfort of polypropylene-fibre knitted fabrics is invested. We find that polypropylene-fibre fabric's wet comfort is strongly related to the fibre fineness, component fibre properties, and constructional fe…
Methyl linoleate was oxidized at 60, 90, 120 and , respectively, with sparging oxygen for different periods of time. On the basis of the peroxide values determined at four temperatures, four heating times were chosen for the analysis of physicochemical parameters, such as peroxide value, total oxidation products, poly…
No abstract provided
The principal mineral fillers used in thermoplastics and the reasons for using them are identified, together with those features that have to be controlled in order to achieve the optimum results and to avoid associated deleterious effects. General methods of filler production are outlined in the light of these requir…
This study systematically investigates the properties of extruded cement-based short polyvinyl alcohol (PFA) fiber reinforced plates with added metakaolin and silica fume. The enhancing effects of the two mineral admixtures on the mechanical properties of the plates are compared by the direct tensile test, freezing an…
: We have fabricated amorphous thin-film specimens containing light elements (B, C, N, O, F, and Mg) in addition to silicon, and have measured their composition using electron energy-loss spectroscopy (EELS). The films appear to be stable during storage in air and during irradiation by an electron beam, for doses belo…
Quasi-static and dynamic magnetomechanical measurements have been made on a twin-freeoriented single crystal of Tb/sub 0.27/Dy/sub 0.73/Fe/sub 2/ (Terfenol-D). Unusually large values of dynamic strain coefficient, d/sub 33/, and magnetomechanical coupling coefficient, k/sub 33/, of 19.1 nm A/sup -1/ and 0.83 respectiv…
A novel class of telechelic α-alkyl ω-trimethoxysilane poly(N-propionylethylene imine)s (TMS-PPEls) has been synthesized by living cationic ring-opening polymerization of 2-oxazolines. A new route for the termination reaction of the living polyoxazoline is described. These block copolymers have been tested as coatings…
A series of macrocyclic heterobimetallic complexes of type [M c (tntnam)M o ](PF 6 ) n and [M c '(tntnim)Ni](PF 6 ) n where M c = Co(III) and Zn(II), M c ' = Co(II), Co(III), and Zn(II), and M o = Ni(II), Cu(II), and Zn(II) have been synthesized and characterized. The macrocyclic ligands tntnim 2 and tntnam 3 contain…
The electrochemical behaviour of 254SMO stainless steel in phosphoric acid media, both with and without chloride ions, has been investigated and compared with that of 316L stainless steel and Hastelloy alloy C276. Open circuit potential measurements, potentiodyn amic polarisation curves, and SEM analyses were used in…