Materials Literature
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A nitrogen purged static-bed batch reactor was used to pyrolyse 3 kg batches of shredded scrap tyres at temperatures between 450 and 600 °C. The yield of char remained fairly constant at about 38 wt% irrespective of pyrolysis temperature; however, the yield of oil decreased from 58 wt% to 53 wt% and the gas yield incr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMechanisms of Surface Electron Transfer. Proton-Coupled Electron TransferScott A. Trammell, John C. Wimbish, Fabrice Odobel, Laurie A. Gallagher, Poonam M. Narula, and Thomas J. MeyerView Author Information Department of Chemistry University of North Carolina at Chapel…
〈111〉-oriented twin free Tb–Dy–Fe single crystals, 〈112〉- and 〈110〉-oriented twinned “single” Tb–Dy–Fe crystals were prepared using floating zone melting technique. Magnetostrictive performances of the crystals were investigated. Better low-field properties were observed in the 〈110〉 twinned crystals than in the 〈112〉…
Summary The plant availability of phosphate applied to calcareous soils is affected by precipitation and adsorption reactions, the relative significance of which is not well known. We used extended P‐sorption curves obtained at phosphate addition rates up to 340 mmol P kg −1 soil to examine the relative contribution o…
The objective is to define a prediction and transposition model for cavitation erosion. Experiments were conducted to determine the energy spectrum associated with a leading edge cavitation. Two fundamental parameters have been measured on a symmetrical hydrofoil for a wide range of flow conditions: the volume of ever…
The ground state total energies of α‐ and β‐Si 3 N 4 crystals are calculated by an ab‐initio method based on local density functional theory. The calculated bulk modulus and pressure coefficients for both crystals are in good agreement with recent experimental measurements. Interatomic pair potentials of the Buckingha…
The crystal structure of NiII2(mcpa)2(CH3OH)3(H2O)[12-MCNiIIN(shi)2(pko)2-4][12-MCNiIIN(shi)3(pko)-4] metallacrown shows it to have a fused arrangement of two [12-MCM(ox)N(ligand)-4] units, the NiII(mcpa)[Ni4(shi)2(pko)2(CH3OH)2] and the NiII(mcpa)[Ni4(shi)3(pko)(CH3OH)(H2O)] with 1+ and 1− charge, respectively. Each…
We study, by means of numerical simulations, the model of dissipative particle dynamics with energy conservation for the simple case of thermal conduction. It is shown that the model displays correct equilibrium fluctuations and reproduces Fourier law. The connection between "mesoscopic coarse-graining" and "resolutio…
A class of degradable, phase-segregated multiblock copolymers is presented. The new copoly(ester-urethane)s, termed DegraPolTM/btgc, consist of crystallizable poly[(3-R-hydroxybutyrate)-co-(3-R-hydroxyvalerate)]-segments and amorphous segments from ε-caprolactone, diglycolide and ethylene glycol. As junction unit an a…
A new UHV spectroscopic X-ray photoelectron emission and low energy electron microscope is presently under construction for the installation at the PM-6 soft X-ray undulator beamline at BESSY II. Using a combination of a sophisticated magnetic beam splitter and an electrostatic tetrode mirror, the spherical and chroma…
Abstract Apatite-dolomite carbonatite at Lesnaya Varaka, Kola Peninsula, Russia, hosts intricate mineral intergrowths composed of lueshite in the core and pyrochlore-group minerals in the rim. Lueshite is a primary Nb-bearing phase in the carbonatite and ranges in composition from cerian lueshite to almost pure NaNbO…
Short bamboo fiber reinforced epoxy composites have been developed with varying fiber length. The chemical resistance tests indicate that the composite materials are resistant to acetic acid, hydrochloric acid, nitric acid, sodium hydroxide, sodium carbonate, ammonia, benzene, carbon tetrachloride and toluene. The var…
The shape memory effect and superelastic behaviour occur by the nucleation and growth of microstructure during a thermoelastic martensitic transformation. A constrained geometrically nonlinear theory is used to construct the twinned martensite, austenite-martensite, wedge, triangle, and diamond microstructures. The la…
Solid-state crystal−crystal transformations in polymers are limited by conformational and steric constraints when helical hands are involved in the initial, final, or both stages of the transformation. The constraints are illustrated by (a) the phase II to phase I transformation in isotactic poly(1-butene), which pres…
A strain of Pseudomonas stutzeri coded 1317 isolated from oil-contaminated soil was found to grow well in glucose and soybean oil as a sole carbon source, respectively. Polyhydroxyalkanoates containing medium chain length monomers of hydroxyalkanoates ranging from C6 to C14 were synthesized up to 52% of cell dry weigh…
Fluoro substitution in thermotropic liquid crystals provides a general way of modifying the properties of a parent system. Melting point, transition temperatures, mesophase types and other physical properties are affected by fluoro substitution so that frequently the behaviour of the parent compound can be manipulated…
Abstract Microcellular polystyrene foams have been prepared using supercritical carbon dioxide as the foaming agent. The cellular structures resulting from this process have been shown to have a significant effect on the corresponding mechanical properties of the foams. Compression tests were performed on highly expan…
Simple methods are presented for handling, mounting, storage and transportation of crystals at cryogenic temperatures. They are easy to learn and have a number of technical and operational advantages over currently popular methods. In particular, the temperature of the crystal throughout all manipulations is known; it…
Oxidation experiments using a particular grade of highly oriented pyrolytic graphite have allowed observation of large numbers of both monolayer and multilayer etch pits on the same samples, formed under identical conditions. Scanning tunneling microscopy was used to measure pits produced after various etch times, tem…
The effects of a sorption-controlled, monolayer-forming surfactant on a drop deforming in an extensional flow are studied numerically. Scaling arguments are presented for drops of 1 cm and 1 µm, indicating the applicability of these results. For all simulations, when mass transfer is slow compared to surface convectio…