Materials Literature
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Abstract Using the mixture of cetyltrimethylammonium bromide (CTAB) and p‐Octyl polyethylene glycol phenyl ether (OP‐10) as templates, siliceous MCM‐48 materials can be synthesized with low molar ratio of CTAB to silica (0.139:1) and low concentration of mixed surfactants ( ca .5%) and within a wide range of OP‐10/CTA…
The V(D)J recombinase, a complex of RAG1 and RAG2, carries out a gene rearrangement process that is required for the achievement of diverse antigen receptor repertoires during the early developmental stage of lymphocytes. It recognizes a specific site spanning the coding DNA region of antigen receptor genes and produc…
Thermal destruction of two-dimensional graphite films on Ni(111), Re(10-10), Ir(111), and Pt(111) substrates is studied. It is shown that the detachment of an edge carbon atom from an island is a limiting process stage for all the cases. The activation energy of this process varies from 2.5 eV for nickel to 4.5 eV for…
We investigate the improvement of 5.90 tex cotton yarn spun with a high total draft ratio of 100 on a modified apron drafting system. For optimum drafting conditions of 5.90 tex spun yarn spinning, the application of drafting force has to be considered during roller drafting. We examine the influence of roller gauge a…
The longitudinal, ε l (ω, k ), and transverse, ε tr (ω, k ), permittivities of a monatomic gas were calculated. The frequency ranges in which the permittivity ε(ω) and permeability μ(ω) of a gas without spatial dispersion have a physical meaning were determined. The limiting magnetic susceptibility χ(ω) at ω=0 and the…
This paper initially gives an introduction to ultra-high frequency (UHF) partial discharge monitoring techniques and their application to gas insulated substations. Recent advances in the technique, covering its application to power transformers, are then discussed and illustrated by means of four site trials. Mountin…
p-methoxy benzylidene malonitrile (MN1) and p-hydroxy benzylidene malonitrile (MN2) were synthesized and tested as inhibitors for the corrosion of mild steel in molar HCl. We have found that both of them inhibit the corrosion. The maximum inhibition efficiency reached 100% for MN1 at 10-4 M and for MN2 at 10-3 M. Curr…
Abstract The hydrosilylation reaction of octa(hydrido)silsesquioxane with ω‐halo‐1‐alkenes and other unsaturated substrates allows attachment of 8 long‐chain functionalized alkyls on the cubic Si 8 O 12 skeleton. Pt/C and H 2 PtCl 6 have been adopted as the catalysts, the yields being 74–98% for compounds 2–9 . For te…
Knowledge of relative heat resistance as well as thermo-mechanical behaviour of refractory castables is very important for their use as linings in high temperature furnaces and refining vessels in the metallurgical, cement, and petrochemical industries. The present work aims at studying these properties for different…
Role of local viscosity in the dynamics of melt spinning of a polymer crystallizing under tensile stress are investigated using mathematical modeling methods. The viscosity is assumed to be dependent on local temperature and degree of crystallinity along the spinning axis. Role of the polymer viscosity is studied for…
EMPLOYMENT OF PEROVSKITE -TYPE OXIDE IN THE PROPANE AND CO OXIDATIONS.Simultaneous oxidation/coprecipitation of an equimolar mixture of La(III) and Co(II) nitrates and La(III) nitrate and Mn(II) chloride afforded a hydroxide gel, which was converted to LaCoO 3 and LaMnO 3 on calcination at 600 °C.After calcination, th…
The temperature dependency of the second overtone band assigned to an OH stretching vibration of water has been investigated by means of spectrum decomposition. The absorption bands of water and ice were decomposed into five and three Gaussian components, respectively, which were assigned to the vibration motion of mo…
Abstract Ultrasound‐induced cavitation is known to enhance chemical reactions as well as mass transfer at ambient pressures. Ultrasound is rarely studied at higher pressures, since a high static pressure hampers the growth of cavities. Recently, we have shown that pressurized carbon dioxide can be used as a medium for…
A limited selection of ring modified diphenyldiacetylenes of the type where A=, Y=C n H2n+1, CF3, F, COMe, NH2, and NMe2, and A=, trans and cis with Y=F and trans with Y=C3H7, were synthesized. Mesomorphic properties were determined by hot stage polarizing microscopy and DSC. These properties were generally poorer tha…
The solubility of nalidixic acid in water-ethanol mixtures has been determined at 25 degrees C. The generated solubility data sets have been used to assess the accuracy of different numerical analyses for the excess free energy model and a new numerical method for solubility prediction in water-ethanol mixtures based…
The Si L 2, 3 x-ray absorption near-edge structure (XANES) spectra of porous silicon nanomaterials and nanostructures with epitaxial silicon layers doped by erbium or containing germanium quantum dots are measured using synchrotron radiation for the first time. A model of photoluminescence in porous silicon is propose…
Polyaniline, polypyrrole, poly( N-ethyl aniline), poly( O-anisidine) and their composite coatings were electrodeposited on Al-2024 alloy. The electrodeposited films were characterised using IR spectroscopy. The peel test (ASTM 3359-97), the lap joint test (ASTM D1002) and electrochemical impedance spectroscopy were us…
Nous avons resolu la structure cristalline de l'analogue synthetique de la radtkeite, Hg 2 + 3S 2 ClI [monoclinique, groupe spatial C2/m, Z = 8, a 16.827(4), b 9.117(1); c 13.165(5) A, β 139.17(2)°, V 1543.2(7) A 3 ], par methodes directes, et nous l'avons affine jusqu'a un residu R de 5.27%, en utilisant 1498 reflexi…
Abstract The Markovian model of mixed-layering that has been used until now for the modeling of X-ray diffraction (XRD) patterns of 2:1 phyllosilicates describes the mixed-layer crystals as stacks of ‘layer units’ (LUs) that associate a 2:1 layer with an interlayer content. This model is not consistent when it is appl…
A mode of cracking termed Type IIIa has been found to occur in the welds of ½CrMoV pipework systems in the UK. This cracking mechanism is not as well documented as the more familiar Type IV cracking, which occurs on these and other ferritic steel systems, but is likely to increase in importance as plant ages. This pap…