Materials Literature
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We have studied the dielectric responses of the layered cobalt oxysulfide Sr$_2$Cu$_2$CoO$_2$S$_2$ with the CoO$_2$ square-planes. With decreasing temperature below the Néel temperature, the resistivity increases like a semiconductor, and the thermopower decreases like a metal. The dielectric constant is highly depend…
This article describes a new process for the production of biopolymers (polyhydroxyalkanoates, PHAs) based on the aerobic enrichment of activated sludge to obtain mixed cultures able to store PHAs at high rates and yields. Enrichment was obtained through the selective pressure established by feeding the carbon source…
Long live the state! Photoexcitation of a zinc chlorin–fullerene dyad with a short linkage results in the formation of the ultra-long-lived charge-separated (CS) state by a one-step photoinduced electron transfer without loss of energy, which is inevitable for charge separation by multistep electron-transfer processes…
Amorphous chalcogenide thin films, especially a-(Se, S) based films, exhibit a number of photo-induced phenomena. In this study, we make the As<TEX>$\_$</TEX>40/Ge<TEX>$\_$</TEX>10/Se<TEX>$\_$</TEX>15/S<TEX>$\_$</TEX>35//Ag thin film and then we measure the holographic diffraction efficiency according to thickness of…
Results of investigation of the effect of electron radiation dose (up to 500 kGy), generated in linear high voltage accelerator, on the contact angle and surface free energy of poly(ethylene terephthalate) (PET) film were presented. Water, glycerin, formamide, diiodomethane, alpha-bromonaphthalene as well as their two…
We consider some generalisations of the Cahn—Hilliard equation based on constitutive equations derived by M. Gurtin in (1996) with a logarithmic free energy. Compared to the classical Cahn—Hilliard equation (see [4, 5]), these models take into account the work of internal microforces and the anisotropy of the material…
Ge/SiO 2 and Si/SiO 2 films were deposited using the two-target alternation magnetron sputtering technique. The Au/Ge/SiO 2 /p-Si and Au/Si/SiO 2 /p-Si structures were fabricated and their electroluminescence (EL) characteristics were comparatively studied. Both Au/Ge/SiO 2 /p-Si and Au/Si/SiO 2 /p-Si structures have…
Extrusion casting processes are developed for HSS rolls and the effects of the extrusion casting process on the properties of HSS rolls are investigated. It was found that pressure, pressing time and pressing speed are three important factors affecting the shrinkage cavity. At a pouring temperature of 1400–1450°C, a p…
ABSTRACT The ability of the DNA duplex to behave as an efficient organized medium for trans‐cis photoisomerization has been explored. The presence of DNA affected isomerization in a variety of ways depending on the aryl moiety properties of the ligand and its DNA‐binding mode. Contrary to intercalating ligands, 9‐[2‐(…
Abstract Probability theory was used to model the microstructure of copolymer chains. Specifically, we derived analytical expressions to describe the chemical composition distribution of multicomponent random copolymers and the longest monomer sequence length distribution of binary copolymers. The results agree with S…
The photoluminescence (PL) properties of a calcium sulphate doped only with trivalent europium are studied before and after X-irradiation. On X-irradiation, a high Eu2+ emission appears clearly, with a simultaneous decrease of the Eu3+ PL intensity. The Eu2+/ Eu3+ PL intensity ratio increases as a function of X-air ke…
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…