Materials Literature
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A new drape elevator is developed to analyze the drape generation mechanism. The drape elevator can measure drape shape, including node generation at various stages during drape formation. The drape elevator method indicates better reproducibility of the drape coefficient of the fabrics than the conventional method. T…
The paper describes regularities of a non-stationary nucleate boiling process during quenching of steels in a liquid media. A generalised correlation for the calculation of the nucleate boiling process duration is obtained. A definition of a self-regulated thermal process that takes place during quenching is introduce…
Solid solution Mg2Si1−xGex for various concentration of germanium, x, is successfully prepared in single phase by the bulk mechanical alloying (BMA) and the hot pressing (HP). Both BMA and HP process conditions were optimized to yield high dense samples with fine, homogeneous microstructure. The electrical conductivit…
Lanthanide(III) complexes of the general formula [Ln(ACAB)(2)(NO(3))(2)(H(2)O)(2)].NO(3).H(2)O where Ln=La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III), Dy(III) and Y(III), ACAB=3-acetylcoumarin-o-aminobenzoylhydrazone have been isolated and characterised based on elemental analyses, molar conductance, I…
For a microwave total-power radiometer, we consider the error introduced by neglecting the difference in the antenna reflection coefficient between when it views a distant scene and when it views a nearby calibration target. An approximate expression is presented for the error, and measurements are described that enab…
Well-crystallized carbon micro-spheres at the sub-micrometer scale were prepared by defluorination of polytetrafluoroethylene (PTFE) with metallic magnesium in supercritical carbon dioxide at 650 °C for 6 h. The products were characterized by X-ray diffraction, transmission electron microscopy, field-emission scanning…
The complex [Gd(L)(H2O)]3- (H(6)L =N,N'-bis(6-carboxy-2-pyridylmethyl)ethylenediamine-N,N'-methylenephosphonic acid) displays the highest water exchange rate ever measured for a Gd(III) chelate (k(298)(ex)= 8.8 x 10(8) s(-1)), which is attributed to the flexibility of the metal coordination environment.
In the present paper the approaches to modelling scale failure described in EPRI report FP 686 are compared to a more recent approach based on micromechanical considerations. The latter requires a detailed analysis of the stress situation in the oxide/metal system and of the “quality” of the oxide scale and scale/meta…
A zirconia and silica co-doped titania material was prepared from a sol–gel method which had been modified to include an organic templating agent. The product was only poorly mesoscopically ordered. However, the materials produced exhibited a very high temperature for the anatase to rutile phase transition (ART) such…
The effect of Co addition on the martensitic transition and magnetic properties of the Ni-Fe-Ga β alloys is investigated. The values of both the Curie temperature Tc and martensitic transition starting temperature Ms increase, while the saturation magnetization Is decreases with increasing Co content in the series of…
The basic matching problem of a propulsion engine to the propulsor is discussed and the influences which should be taken into account. The concepts of sea margin, engine margin and light running margin are handled and an indication of their values is given. The methods of calculation to evaluate design and off design…
Dynamic mechanical behaviors of 45 steel have been studied with the split Hopkinson pressure bar(SHPB) and static material test system over a wide range of strain rates and temperatures.The Johnson-Cook constitutive relationship parameters are determined through these experiments.The parameters are validated by compar…
In an accompanying article, we have described a methodology for the simulation of dislocations in structurally complex materials. We illustrate the applicability of this method through studies of screw dislocations in a structurally simple ionic ceramic (MgO), a molecular ionic mineral (forsterite, Mg2SiO4), a semi-io…
This paper addresses the issue of determining the level of defect that is likely to cause the failure of solid dielectric transmission class cables. It also proposes methods for predicting the level of defect that is likely to cause failure and to provide a simple analytic approximation for doing so in the case of con…
A micromechanical model is developed for the elastic continua with virtual multi-dimensional internal bonds. The basic idea of the presented model is that materials are discretized into mass particles and these mass particles are connected with randomized normal and shear bonds. Based on the Cauchy-born rules and the…
Metallothionein fusion proteins allow for site-specific, orthogonal functionalization of proteins to a variety of nanoparticles.
The intercalation of phenol into p-[2-(2-hydroxyethyldimethylammonio)ethoxy]azobenzene–clay (montmorillonite, synthetic saponite and fluor-tetrasilicic mica) intercalation compounds induced by UV irradiation is reported. Phenol was intercalated into the interlayer spaces of the azo dye–fluor-tetrasilicic mica (the cat…
The amount of electronic charge transferred between gold particles and polyaniline depends not only on the electron affinity of the two materials but also on the size of the gold particles. As measured by X-ray photoelectron spectroscopy, for particles < approximately 5 nm the binding energy of the electrons is size d…
We have prepared polycrystalline n-type Ba8CuxGayGe46−x−y (x=0–5, y=16−3x) clathrate compounds by arc melting and spark plasma sintering techniques and investigated the effect of Cu substitution for Ge on their thermoelectric properties. The Hall carrier concentration for Cu-substituted compounds is almost constant at…
Two-dimensional nanowalls of GaS and GaSe are obtained by thermal exfoliation around 900 degrees C, and transformed to Ga2O3 and GaN nanowalls upon reaction with air and ammonia respectively at 800 degrees C, while maintaining dimensional integrity.