Materials Literature
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An investigation was conducted to examine adiabatic shear band formation under a pressure of 1.5 GPa with a modified version of the hat specimen. Using tungsten alloy data generated with a symmetric Taylor test, the influence of pressure on the critical strain associated with adiabatic shear handing formation was foun…
The inhibition of copper corrosion by 1,3,4-thiadiazole-2,5-dithiol (bismuthiol), under 0.5 M HCl at 25 C, was studied by means of the potentiodynamic polarization technique. It was found that bismuthiol was chemically adsorbed on the copper surface, and follows a Langmuir isotherm. The inhibition mechanism was found…
This paper is concerned with the energy absorption efficiency of auto-body side Structures for the conventional steel and 60TRIP high strength steel. In order to evaluate the energy absorption efficiency, the dynamic crash analysis is carried out with the regulation of US-SINCAP. The analysis adopts the Johnson-Cook m…
A batch anaerobic composting process was investigated to evaluate the potential for biogas recovery from animal manure under the worst scenario of high initial solids and non-well adapted microorganisms. The effects of composting time and initial total solids content on biogas recovery and reduction of solids during a…
Abstract In this study it is shown that the epoxide derivative of oleic acid, methyl 9,10‐epoxyoctadecanoate, is readily hydrolyzed to a diol when exposed to a commercial preparation of neutral alumina. Comparison of 1 H and 13 C NMR spectra of the diol with those of standards showed that the product was the threo iso…
The data are presented on optimization of cellulose synthesis by Acetobacter xylinum (strain VKM V-880) and the structural characteristics of A. xylinum cellulose gel film synthesized during static cultivation. The structural changes caused by the removal of water from gel films are established and the structural orga…
We present in situ (x-ray diffraction) and ex situ (quenching) structural studies of crystalline, liquid, and glassy B 2 O 3 up to 9 GPa and 1700 K, drawing equilibrium and nonequilibrium phase diagrams of B 2 O 3 . Particularly, we have determined the melting curve, the stability regions for crystalline B 2 O 3 I and…
Abstract The effect of modified flax fibers by plasticizer absorption in poly(L‐lactic acid) composites was investigated. The plasticizes chosen were triethyl citrate (TEC), tributyl citrate (TBC) and glycerol triacetate (GTA), which were derived from natural sources. Characterization was performed by differential sca…
The high‐temperature performance of a Nextel‐720 fiber/Al 2 O 3 composite in air and water vapor at 1100°C was investigated using X‐ray photoelectron spectroscopy (XPS) and thermodynamic calculations. In the presence of water vapor, the formation of volatile Si(OH) 4 was responsible for the loss of mullite phase in th…
Yttrium silicate (Y 2 SiO 5 ) powders of high purity have been synthesized using the sol–gel method. Alkoxide precursors were used with commercial tetraethyl orthosilicate as the silica source and yttrium propoxide synthesized from YCl 3 . Powders calcined from the xerogel showed submicrometer crystal sizes. These pow…
In the present work, multiwalled carbon nanotube (MWNT) thin films deposited by plasma enhanced chemical vapor deposition have been investigated as resistive gas sensors towards NO2. The sensor design is a platinum interdigitate electrode, fabricated by photolithography upon Si3N4 deposited on silicon, over which the…
The crystal structure of anhydrous δ- D -mannitol (C 6 H 14 O 6 ) was solved from high-resolution synchrotron X-ray powder diffraction data collected on a mixture containing 20% and 80% w/w of β- and δ- D -mannitol, respectively. The direct space simulated annealing program PSSP , and Rietveld analysis employing GSAS…
The synthesis of crystalline y ‐Y 2 Si 2 O 7 has been achieved at a temperature as low as 365°C. This has been accomplished by following a hydrothermal method and using a layered clay as silicon source, whose structure‐directing character facilitates the nucleation process. The structural characterization of the y ‐Y…
The optimisation of physical foaming of branched Daploy ™ WB130HMS polypropylene foam resin and corresponding blends with a Polypropylene Blockcopolymer are described in this paper. The resulting foam morphologies of blends consisting of linear and branched polypropylene materials produced at various processing temper…
The synthesis of a variety of thiophene-containing materials for use in electro-optic devices requiring highly birefringent materials is reported. The refractive indices were measured with the use of an Abbé refractometer, and from these results the optical anisotropies, polarizabilities and order parameters were dete…
Activated carbons (ACs) were prepared by the physical activation of cork wood, virgin cork and adult cork of different particle sizes in carbon dioxide and characterised by elemental analysis, DRIFTS, SEM and N 2 adsorption at −196°C. The wood gave results similar to those obtained with other lignocellulosic precursor…
This study analyses diatom communities on submerged stones in three areas of the Bothnian Sea, a subbasin of the brackish Baltic Sea. The communities were composed of mixtures of epilithic, epiphytic, epipelic, epipsammic and occasionally some pelagic diatoms. Altogether, 120 quantitative epilithic samples, 40 per are…
Mechanisms in which fatty acids destabilize beer foam have been studied. Foam stability of a pilot-brewed beer was measured in the presence of a range of concentrations of fatty acids, similar to those found in a range of commercial beers. The foams were sparged with nitrogen and studied using a microconductivity tech…
Compression stress-strain measurements have been conducted on two commercial high temperature thermoplastic polymers (polyamideimide (PAI) and partially crystalline polyetheretherketone (PEEK)) as a function of temperature (-55°C to 300°C) and strain rate (0.001 s -1 to 2500 s -1 ). A split-Hopkinson pressure bar (SHP…
The urea induced equilibrium denaturation behavior of glutaminyl-tRNA synthetase from Escherichia coli (GlnRS) in 0.25 m potassium l-glutamate, a naturally occurring osmolyte in E. coli, has been studied. Both the native to molten globule and molten globule to unfolded state transitions are shifted significantly towar…