Materials Literature
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A new structural refinement process for BaTiO 3 /SrTiO 3 (BTO/STO) artificial superlattices was proposed, taking into account the effect of interdiffusion between BTO and STO. The samples were prepared using the molecular beam epitaxy (MBE) method on SrTiO 3 (001) substrates at 600°C. The step model, the phonon model…
Studies on structural characterisation and anion binding properties of a series of core modified meso-aryl sapphyrins and rubyrins are described. It has been shown that the sapphyrins and rubyrins bind anions such as F−, N3− and CO32− in their protonated form. The binding constants evaluated for a particular sapphyrin…
Ion transport properties in ion-exchanged glasses are re-examined by a.c. impedance and infrared spectroscopies. In typical soda - lime-silica (float) glass it is shown that when Na+ ions are replaced by K+ ions, the region of highest resistivity resides in the surface, confirming the earlier result of Tomandl and Sch…
Examined in this study is the variation of crystallinity and crystal plane size of water_swelled cellulose Ⅰ treated by microwave. The results from FTIR show that there is no effect of microwaves on the chemical structure of cellulose, but its N_O′KI increases. Moreover, the results from WAXD indicate that cellulose Ⅰ…
An engineering model is proposed to evaluate the variation of corona charge and corona current as a function of applied voltage for coaxial geometry (q-v curves). The two main assumptions of the model are the following: for streamer discharges to propagate continuously, the background field must be at, or just above,…
Periodic first-principles density functional (DFT) calculations have been performed to give an understanding of the active site and mechanism for the selective catalytic reduction (SCR) of NO by NH3 over V2O5 in the presence of gaseous oxygen. Two synergetic functional groups, i.e. dual vanadium sites, have been found…
Four new phytosphingosine-type ceramides, (2S,3S,4R)-2-[(2'R)-2'-hydroxydocosanoylamino]-1,3,4-octadecane triol (1), (2S,3S,4R)-2-[(2'R)-2'-hydroxytricosanoylamino]-1,3,4-octadecan etriol (2), (2S,3S,4R)-2-[(2'R)-2'-hydroxypentacosanoylamino]-1,3,4-octadec anetriol (3) and (2S,3S,4R)-2-[(2'R)-2'-hydroxyhexacosanoylami…
A multitude of metal-rich pnictides and chalcogenides of the valence-electron-poor transition elements M have been uncovered in recent years. Common structural features of all these compounds are extended metal atom substructures (of different kinds) and the occurrence of metal–pnicogen and metal–chalcogen bonds, resp…
Using two different kinds of many-body potentials as well as the Lennard-Jones potential for hexagonal close packed metals, we have found that c + a edge dislocations with dislocation lines along 1 00 can split onto the basal plane, forming a non-planar sessile structure. The `type I' undissociated dislocation core, o…
A modified sessile drop method, that is, a crucible method was developed to obtain a precise density value of molten silicon using a Si3N4 crucible. The density decreases linearly with increasing temperature in the range from 1689 to 1853 K. However, anomalous behavior of the density with temperature reported by anoth…
Counter diffusion chemical vapour deposition (CVD) is an excellent way to prepare inorganic thin films or membranes on the surface of porous or non-porous supports. Modification of the pore size of porous supports by this method to prepare molecular-sieve membranes is another interesting opportunity. However, control…
Because of several technical and economical advantages XLPE (cross-linked polyethylene)-insulated power cable systems are increasingly used in the high voltage (HV) and extremely high voltage (EHV) range. High voltage XLPE-insulated cables consist of a copper or aluminium conductor (inner conductor), a semiconducting…
Dermal sheep collagen was crosslinked with 1,4-butanediol diglycidyl ether (BDDGE) or modified with glycidyl isopropyl ether (PGE). The reduction in amine groups as a function of time was followed to study the overall reaction kinetics of collagen with either BDDGE or PGE. Linearization of the experimental data result…
This paper presents results of an analytical core loss calculation method developed for single phase and five limb three phase core types. Shown are calculation results of flux distributions, flux density waveshapes, spatial flux density curves and loss distributions in cores other than the 3 phase-3 limb core. The an…
This paper describes a study on the development of stainless steel/polyester knitted fabrics for electromagnetic shielding applications. To facilitate knitting of stainless steel wires and to reduce the material cost, initially blended yarns of staple stainless steel and polyester fibers were fabricated by using the r…
Dynamic compression tests were performed by means of a Split Hopkinson Pressure Bar (SHPB). Test materials were 2124Al alloys reinforced with 17% volume fraction of 3, 13 and 37 μm SiC particles, respectively. Under strain rate ε = 2100 l/s, SiC particles have a strong effect on σ 0.2 of the composites and the σ 0.2 i…
The first photophysical studies of a member of the family of subnaphthalocyanines are described. The cone-shaped unsubstituted subnaphthalocyanine, synthesized in 35% yield, provides it with distinctive photophysical properties that are better than those of the related planar phthalo- and naphthalocyanines. SubNc abso…
The equation of state of a dry foam with ideal gas in the bubbles, proposed by Ross, is proved. This equation suggests that a foam with a free boundary will expand to a maximum volume if the external pressure is lowered at constant temperature. The same foam enclosed in a container, on the other hand, can be expanded…
26. Diversity of Reactions Catalyzed by Heme-Thiolate Proteins. 27. Oxometalloporphyrins in Oxidative Catalysis. 28. Shape-Selective Oxidation by Metalloporphyrins. 29. High-Valent Iron and Manganese Complexes of Porphyrins and Related Macrocycles. 30. High-Valent Intermediates. 31. Metalloporphyrins in Catalytic Oxid…
Scleractinian skeleton is composed of mineral and organic phases. Using staining tech− niques (acridine orange dye) Johnston’s (1980) pioneering observations of intraskeletal organic envelopes in Pocillopora damicornis coralla can be extended to two other coral reef genera i.e., Acropora and Favia. The concept of biol…