Materials Literature
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We describe our method based on pulse radiolysis with optical detection developed for the examination of the kinetics and mechanism of the first steps of high-energy radiation initiated polymerization. The absorption spectra of the intermediates were obtained in cyclohexane solution of hexanediol diacrylate (HDDA) of…
An electron tracing code in spherical coordinates was used to treat irregular, nonspherical boundaries in the “Herzog regions” at the exit and entrance planes of hemispherical energy analyzers. Some of the classical designs, i.e., the sudden cutoff “ideal field” approximation, real apertures in the 180° plane, the Her…
Depth of field (DoF) in scanning electron microscopes is evaluated at high magnifications where the image resolution is limited by the probe size. The calculation of DoF is made in terms of the information passing capacity of an optical system or entropy of the image estimated along the optical axis near focus. Electr…
The structure of DLH (C123S) with PMS bound was solved to 2.5 A resolution (R factor = 15.1%). PMSF in 2-propanol was delivered directly to crystals in drops and unexpectedly caused the crystals to dissolve. New crystals displaying a different morphology emerged within 2 h in situ, a phenomenon that appears to be desc…
A study on the newly developed couplant li quid and gel suitable for ultrasonic NDT inspecti on is reported . Results of the meas urements of various physical parameters like viscosity , density, ult rasonic velocity, etc. which have direct influence on acoustic coupling, are reported . With the help of the measured u…
In a finite element code using magnetic vector potential as unknown, the fixed point method needs the relationship which gives the magnetic field H from the magnetic flux density B. In this paper, we present two methods to obtain the magnetic behaviour H(B) of a ferromagnetic material. The first uses centred cycles to…
As a new azide-free gas generant, the thermal behavior of the Sr complex nitrate of carbohydrazide was investigated in the mixed system with various oxidizing agents (KClO4, KBrO3, Sr(NO3)2, KNO3). For the differential thermal analysis, the initial temperature of the reaction of mixtures with KBrO3 was lower than that…
ABSTRACT Aqueous solutions of sodium hydroxide were used to debran whole sorghum and millet grains. The alkali solution was effective in dissolving the pericarp, leaving the kernel free of pericarp. Various combinations of concentration of sodium hydroxide (3, 6, and 10%, w/w) and soaking duration (5, 8, and 10 min) w…
DSC, X-ray, broad-line proton NMR, and microscopy studies on several series of N,N' -dialkanoylbenzene-1,2-diamines are presented. The melting point and associated enthalpy are not much affected by methylation of the aromatic nucleus. While the dimethyl compounds carrying heptanoyl-to-hexadecanoyl groups generate meta…
The effect of sulfur accelerators during the curing process in natural rubber (NR) was investigated. The samples were prepared by adding the same fraction of various types of accelerators in the compound and all samples were cured at the same temperature but for two different times. Determination of the molecular mass…
Homeotropic nematic layers of MBBA, oriented by self-assembled layers (on glass substrates) of dilauroyl phosphatidyl choline (DLPC), cetyl trimethyl-amonium bromide (CTAB) and silane orienting agent (ODS-E), were studied by phase-sensitive flexoelectric spectroscopy method. DLPC solutions in chloroform provided multi…
Abstract The determination of the optimum lime content of fly ash is very important to enhance its use. Recently, methods have been established to obtain the optimum lime content of fly ashes. Strength obtained at different ages becomes important for different applications. The effect of the curing period on the optim…
The design, construction, and use of a furnace from which time-resolved x-ray diffraction data may be measured from reacting mixtures of solids or of solids and liquids is described. The furnace is a vertical tube design, constructed from commercially available components, and can operate at temperatures of up to 1000…
Recent research into superplasticity has developed substantially, to the extent that there are now important directions for future investigations, one of which is high strain rate superplasticity (i.e., superplastic behaviour at strain rates over 10-2 s-1) in metallic materials. Superplasticity at extremely high strai…
This paper describes the synthesis and characterization of four bismaleimides containing a phenylbenzoate mesogenic group and differing by the length of the polymethylenic spacers. They were prepared by reacting 4-maleimidobenzoyl chloride with diphenols containing methylene bridges. The cured resins are stable up to…
This paper presents simulations of directional solidification of multicomponent alloys using the phase field method. In order to calculate thermodynamic quantities of the alloy, the phase field model has been coupled to multicomponent thermodynamic databases in an `online' mode using the TQ-Interface of the software T…
Recent years have seen a growing interest in optical sensors based on oxygen-induced or temperature-induced changes in the luminescence intensity of organic dyes [1][2][3][4].Probes available for optical temperature sensor are fluorescent, thermal-quenchable and non oxygen-quenchable organic and inorganic dyes, such a…
Polymer network-stabilized ferroelectric liquid crystals with homogeneous alignment have been produced in cells without a surface alignment layer. In this technique, a crosslinkable monomer is mixed into a ferroelectric liquid crystal and polymerized in a magnetic field to form a polymer network that will stabilize th…
Abstract A new photoluminescent oxygen sensor based on the luminescence intensities of tris(acethylacetonato) 1,10-phenanthroline terbium(III) complex (Tb(acac)3phen) doped in alumina film was developed. The luminescence intensity of the Tb(acac)3phen film decreased with increasing the oxygen concentration. Tb(acac)3p…
The thermal annealing behaviour of metamict titanite from Cardiff, Canada, which shows moderate structural damage from the a-decay of radiogenic elements (U, Th) has been studied using single-crystal synchrotron radiation and optical-birefringence techniques. Progressive and isothermal annealing experiments yield a te…