Materials Literature
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Fractal geometry is used to objectively evaluate the surface ruggedness of fabric wrinkles and seam puckers. To measure the fractal dimension (FD) of wrinkles and puckers, both the spatial cubical box-counting method and the cross-sectional method are employed. The results of the fractal dimensions of wrinkles and puc…
The stable corona discharge has found use in a large number of electrostatic applications and one of their important properties is the inception voltage which can be easily and accurately measured. The empirical Peek's law which yields the corona inception field is previously made in standard air for wire-to-cylinder…
Abstract Some quinolinol derivatives possessing suitable triplet state energy were examined to sensitize the luminescence of neodymium ion (Nd(III)) as coordinating ligands. Photosensitized luminescence in the near-infrared region of four neodymium(III) complexes: tris(8-quinolinolato)neodymium(III) ([Nd(q)3]), tris(5…
Abstract The pink clays from the Tagus basin, Spain, were characterized by X-ray difraction (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Chemical data were obtained by plasma emission spectroscopy and analytical electron microscopy (AEM), and specif…
The paper elucidates on some of the potential systems benefits and provides an update of progress in major high-temperature superconductor (HTS) transformer development programs worldwide. It begins with background sections on earlier low-temperature-superconductor (LTS) transformer developments and on transformer los…
A series of straight chain, branched and cyclo-delta-aminolaevulinic acid (ALA) esters have been synthesized and their photosensitizing properties analysed using an in vitro system of rat pancreatoma cells. Structurally favourable ALA esters not only induced the formation of more of the endogenous photosensitizer, pro…
The role of the corrosion products in the inhibition of Zn alloy coating corrosion has not been considered fully to date. Atmospheric corrosion data on Zn, Zn-Fe, Zn-Co, and Zn-Ni electrodeposits exposure to marine and urban test sites of a humid, tropical climate during a 3-year period revealed that Zn-Ni and Zn-Co c…
We prepared a Tm-doped glass composite with a Nd-doped layer as a model 1.4-mum thulium-doped fiber amplifier (TDFA) to investigate the effect of energy transfer on the emission spectra of the composite. The competitive 0.8-mu;m emission from the Tm:(3)H(4) level, which had a branching ratio ten times larger than that…
Models for environment-assisted cracking (EAC) predominantly consider anodic reaction-based processes for simulation of crack propagation. A limited number of models have been developed to evaluate crack initiation or fatigue crack velocities by relatively simple analytical equations. Considerable effort also has been…
The morphology of single native cellulose (flax) fibres was investigated by means of simultaneous small-angle scattering and fibre diffraction using an X-ray microbeam. The azimuthal broadenings both of the equatorial small-angle scattering streak and of Bragg reflections are found to be due to a misalignment of the c…
The flow pattern induced by ultrasonic vibration in a water vessel is investigated experimentally using several liquids. In tap water, vortex streaming of cavitation bubbles around the pressure node of a standing wave occurred because of the large number of cavitation bubbles generated by the ultrasonic vibration. Aco…
New techniques for measuring surface degradation are applied to the study of surface tracking resistance of materials intended for outdoor use. Cycloaliphatic epoxy resin (CAE) with 200 pph silica powder was aged under accelerated conditions for 100 h (100 to 250/spl deg/C) and then its tracking resistance was assesse…
The chemical reactions between nitrogen dioxide vapour and diphenylamine (DPA), some of its nitro/nitroso derivatives and between their consecutive products have been studied at temperatures of about 23 °C, whereby cellulose was used as substrate material. The following stabilizer compounds were used as starting compo…
The physical gelation of organic solutions of 3,4,5-tris(octyloxy)benzamide at ambient temperature, subsequent to shock-freezing in liquid nitrogen is reported. Microscopic investigations of the morphology of these “supramolecular organogels” suggests the occurrence of networks of rod-like crystals with diameters betw…
Phenyl side chains were introduced to poly(butylene succinate) and poly(ethylene adipate) by the polymerization of the respective monomers in the presence of mandelic acid. The increasing content of the phenyl side chains decreased the melting temperature and the crystallinity but increased the glass-transition temper…
We describe a web server, which provides easy access to the SLoop database of loop conformations connecting elements of protein secondary structure. The loops are classified according to their length, the type of bounding secondary structures and the conformation of the mainchain. The current release of the database c…
Abstract Mineralogical studies were performed on authigenic clay minerals of mudrocks, sandstones, and bentonites from 38 boreholes in the Late Permian coal measures of the Bowen Basin. Clay-mineral separations of samples from the northern Bowen Basin consist mainly of (Reichweite, R) R = 1 and R ≥ 3 interstratified i…
The effectiveness of calcite growth inhibition by copper(II) ions depends not only on copper concentration but also on calcite supersaturation and solution composition (i.e., pH, carbonate concentration, etc.). This paper presents an investigation of the effect of solution composition; an earlier paper (Parsiegla and…
We propose a mechanism of nodeless d-wave superconductivity in a quasi-one-dimensional organic superconductor under anion order. It is shown that a split of the Fermi surfaces due to the anion order eliminates the line nodes of a d-wave gap function on the Fermi surfaces, and a small finite energy gap appears in the q…
Monophosphate tungsten bronze with pentagonal tunnels (PO2)4(WO3)2m are low-dimensional materials with charge density wave (CDW)-type electron instabilities. Two forms of the structure can thus be expected for all the members of the series: a low-temperature form (LT) corresponding to the CDW state and a high-temperat…