Materials Literature
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Pewter, a tin-rich alloy, has been widely used for ornamental and utilitarian purposes for the last 400 years because it is durable, relatively easily worked, resistant to corrosion, and similar to silver in appearance. Pewter plates and implements have been recovered and examined from what is believed to be the wreck…
Calcium (Ca(2+)) fluoroionophores are useful in cell-based functional assays of G-protein coupled receptor (GPCR) activation or ion channel modulation. In this paper we describe new calcium probes that improve or overcome certain deficiencies in existing probes. These new fluoroionophores are based on acylation of ami…
The drape attributes of fabrics, number of folds, depth of folds and evenness of folds were measured together with the drape coefficient. The relationship between these measurements and the subjective evaluation of the fabric drape was modelled for each end‐use on a neural network using back propagation, which can cor…
The microstructures of two hot-pressed Si3N4 ceramics, with 3.33 and 12.51 wt% Lu2O3 additive, have been characterized using transmission electron microscopy. The microstructures of both samples consisted of elongated β-Si3N4 grains and a secondary phase, contained in pockets surrounded by the grains, with a crystalli…
Pouco se conhece sobre a diversidade de solos em ambientes altimontanos do Brasil apesar da acentuada valorização ecoturística atual. Foram estudados atributos químicos, físicos, mineralógicos e micromorfológicos de dez perfis de solos altimontanos em dois transectos do domínio quartzítico do Parque Estadual do Ibitip…
The oxidation product of the binuclear copper (I) complex Cu2L(ClO4)2 (L = N,N'-bis-(6-methyl-2-pyridil) (2'-pyridyl)methyl m-xylylidene imine) has been isolated and structurally characterised. In the cupric species, [Cu2L(Me-O)2](ClO4 )2, the metal centres are bridged by two methoxide groups, and the oxygenation of t…
We describe the preparation and characterization of a new double perovskite of formula Ba 2 MnMoO 6 . It has been obtained in polycrystalline form by thermal treatment, in a H 2 /N 2 flow, of previously decomposed citrate precursors. This material has been studied by X-ray (XRD) and neutron powder diffraction (NPD): i…
We present measurements of the temperature dependence of the pyroelectric effect in congruently melting strontium–barium–niobate doped with cerium and chromium in the range of the relaxor phase-transition. The influence of the doping concentration on the transition temperature is shown and discussed with respect to th…
Argininosuccinate synthetase reversibly catalyzes the ATP-dependent condensation of a citrulline with an aspartate to give argininosuccinate. The structures of the enzyme from Thermus thermophilus HB8 complexed with intact ATP and substrates (citrulline and aspartate) and with AMP and product (argininosuccinate) have…
The aim of this work was to demonstrate the possibility of obtaining enantiotropic liquid crystals containing a single phenyl group over a wide temperature range but without hydrogen bonding. We report the synthesis and characterization of several alkoxy monophenyl compounds linked by a thioester group to a 2-(perfluo…
The microstructural and texture evolution of cold rolled low stacking fault energy fcc Fe‐30Mn‐3Al‐3Si alloy was investigated as a function of the cold rolling strain. The alloy was melted and cast in a vacuum induction furnace, hot rolled and annealed before being cold rolled at three different strains: ε = 0.035, e…
This paper investigates the dielectric properties of various N/sub 2//SF/sub 6/ gas mixtures based upon a cylindrical spacer model with adhering particle on the surface tinder homogeneous field conditions. The investigation involves a comparison with pure SF/sub 6/. The flashover field strength for clean and particle…
The analysis of variation in thermal conductivity and the m1 al diffusivity of Banana fiber reinforced polyester composites caused by the addition .of g lass fiber have been presented in thi s paper. The composite shows an in crease in therm a l conductivity in compari son to matrix . However, th e thermal conductivit…
Abstract Halogenated plastics such as PVC pipe, PTFE tube, and latex gloves were test‐burned in a bench‐scale molten salt oxidation reactor. Hydrogen halides (HCl and HF) and free halogens (Cl 2 and F 2 ) first released by the thermal decomposition of halogenated plastics (PVC and PTFE) were nearly completely collecte…
Silk is a good example of a self-assembled natural material with attractive characteristics. Attempts are now being made to produce recombinant forms, through transgenic animals, that have potential in a number of medical technologies.
Crack‐velocity ( v – K ) curves and crack‐resistance ( R ) curves for unpoled ferroelectric and ferroelastic lead zirconate titanate (PZT) were determined for long cracks in compact‐tension (CT) geometry using an in situ fracture device on the stage of an optical microscope. The steady‐state crack length and the plate…
The corrosion rate of zinc under thin electrolyte layers and during exposure to wet/dry cyclic conditions has been investigated in sodium chloride (NaCl) and ammonium sulfate ([NH4]2SO4) solutions using electrochemical impedance spectroscopy (EIS) and potential measurements. The integral corrosion rate was found to de…
Efficient photoluminescence (PL) up-conversion in CdSe/ZnS quantum dots prepared by an organometallic approach is reported. It is demonstrated that the efficiency of photon energy up-conversion and the magnitude of the spectral shift can be controlled by (i) the thickness of the ZnS layers, (ii) the temperature depend…
The fracture toughness of a sintered reaction‐bonded silicon nitride was measured by the single‐edge precracked beam and surface crack in flexure methods, which are two of the three complementary test methods in ASTM C 1421. Results were compared with chevron‐notched beam results that were available from another sourc…
Abstract Three types of copolymers of poly( L ‐lactic acid) (PLLA) were synthesized by direct polycondensation of L ‐lactic acid and phenyl‐substituted α ‐hydroxy acids ( L ‐phenyllactic acid and D ‐ and L ‐mandelic acids). It was found that the glass transition temperature of the copolymers comprising L ‐mandelic aci…