Materials Literature
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An emission at 281 nm with a 10.5 ns single exponential decay and a highly selective, narrow excitation region between 202 and 211 nm has been observed for ${\mathrm{Ce}}^{3+}$ doped in ${\mathrm{Cs}}_{3}{\mathrm{LuCl}}_{6}.$ Wavelengths between 50--200 nm and longer than 215 nm have zero excitation efficiency. Excita…
materials With the growing public interest in environmental problems in recent years, the importance of thermoelectric power generation — an energy conversion technology — is being re-recognized. In 2002, the “development of a high-efficiency thermoelectric power generation system ” was started under the leadership of…
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Extracted thermomechanical pulp from spruce was fractionated into microfines, fibrils, flakes, ray cells and fibres using centrifugation, sedimentation and filtration steps. The chemical composition and the amount of anionic groups were determined. The various types of fines differed greatly in chemical composition. T…
Systematic density functional B3LYP calculations with the 6-31G* and 6-311+G* basis sets have been employed in order to investigate the structure, vibrational frequencies, relative energies, vertical ionization potentials, and magnetic shielding constants of endohedral and exohedral isomers in two related families of…
This report describes investigations performed on as welded and post weld heat treated samples of AISI 8630 steel, buttered with Inconel 625 and Inconel 725. The investigations have focused on the properties and microstructure in the partial mixed zone between the buttering and the steel before and after post weld hea…
New mesogenic homologous series of Schiff base cinnamates comprising a naphthalene moiety were prepared by condensing different 4(4'-n-alkoxy cinnamoyloxy) benzaldehydes with 2-amino naphthalene. All the synthesized compounds were characterized by combination of elemental analysis and spectroscopic techniques. All the…
Factors that influence alloying zirconium to magnesium with a Mg-33.3Zr master alloy and the subsequent grain refinement are discussed based on a large number of experiments conducted at the laboratory scale (up to 30 kg of melt). It is shown that the zirconium particles released from the Zirmax(R) master alloy must b…
The oxidation behavior of B4C–(25–60 mol%)SiC composites prepared by arc-melting was investigated in the temperature range of 1073 to 1773 K using a thermogravimetric technique. Liquid borosilicate, solid SiO2 and carbon were identified as oxidation products by X-ray diffraction and Raman spectroscopy. Mass gain was o…
This paper reviews recent developments in complete oxidation of methane at low temperatures over noble metal catalysts in the past 20 years. The Pd/Al2O3 catalyst system is fully discussed. The review mainly focuses on the kinetic aspects of methane oxidation over this catalyst, and methane activation behavior over Pd…
Abstract New decaborane-based, single-source molecular and polymeric precursors to boron carbide have been developed that enable the formation of boron carbide in processed forms, including nanofibers, nanocylinders, and nanoporous materials.
We report the synthesis of a class of lithium salts in which the two strongly Lewis basic sites of lithium imidazolide are each complexed by the Lewis acid to yield lithium bis(trifluoroborane)imidazolide The anion has a high degree of charge delocalization over the aromatic ring and two four-coordinate boron centers…
Significant grain refinement has been achieved in a cast Mg-based AZ91 alloy via large strain hot rolling. This is a simple processing method consisting of one rolling pass at intermediate temperatures with a large thickness reduction. The as-cast material was first homogeneized in order to obtain a homogeneous and eq…
Activated carbons were produced from compressed South African sugarcane bagasse in a pyrolysis furnace by adopting the physical method of processing viz. carbonization followed by partial gasification with steam. Feasible processing conditions were determined by varying the temperature, hold times and partial pressure…
The effect of water vapour on the oxygen isotope exchange reaction was investigated for gadolinium doped ceria (GDC), scandium stabilized zirconia (ScSZ), and iron doped ScSZ (Fe-ScSZ). A slight amount of water vapour addition made a great enhancement of surface exchange rate of oxygen isotope (18O) on the surface. Th…
The paper describes several innovative designs for a bird strike resistant composite leading edge for a Horizontal Tail Plane of an aircraft. These designs were based on a novel application of composites with high energy-absorbing characteristics: the tensor-skin concept. This paper describes the development of this e…
The radioactivity in the primary circuit of pressurized water reactors (PWR) mainly comes from the activation of corrosion products in the core of PWR; corrosion products dissolve from the oxide scales developed on steam generator tubes of alloy 690. The controlling of this process, oxidation and dissolution, requires…
Gyroelectric and gyromagnetic media have tensorial gyrotropic dielectric permittivity ε and magnetic permeability μ and thus are generally treated separately. In order to unify their descriptions and to determine the mode propagation in a generalized medium, the solution of the equations of the electromagnetic field i…
Novel supramolecular, reversibly formed polymers featuring self-assembling capsules have been constructed through chemical fixation of CO2 and hydrogen bonding.
Vacuum diffusion bonding of SiC ceramic to Ni–25 at.-%Cr alloy was carried out at 1223–1323 K for 0.9–3.6 ks under a pressure of 7.2 MPa. The kinds of the reaction products and the interface structures of the joints were investigated by scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and X-ray…