Materials Literature
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Postirradiation microstructure examinations of Zr-2.5Nb pressure tubes removed from service in CANDU™ reactors have shown clear trends in the dislocation structure and the state of the β-phase, as a function of operating temperature, neutron flux, and time. These microstructural parameters correlate well with changes…
A new bending device was developed which allows continuous change of the bending radius of the BSCCO tape sample at 77 K and a simultaneous measurement of the critical currents. The samples are mounted free between two clamps. The special geometry of the arrangement insures over the whole range a sample shape with hom…
Histomorphometric and histopathological evaluations of the effects of fresh leaf extract of Calotropis procera on the reproductive organs of male wistar rats given 20mg\\gm body weight of the extract once daily, orally, for varying number of days showed varying degrees of desquamation of seminiferous epithelial cells,…
There are numerous reasons for which film coatings are applied to pellet formulations; for example, controlled release, taste masking, and improved stability. The aim of this paper was to study the influence of pellet shape on the deposition of film coatings in a fluid-bed process by monitoring the pellet shape as a f…
The simultaneous control of morphology of Dy-Ni alloy was achieved by selective anodic dissolution of Dy in a molten (0.50 mol %) system at 700 K. The electrochemically formed films, about 20 μm thick, were transformed to porous and Ni films, depending on the applied potential. Larger pores were formed when the applie…
The thermodynamically stable tellurium phase (standard conditions) in the trigonal α-Se structure type may be understood to arise from a three-dimensional Peierls distortion away from a simple cubic structure. Three-dimensional electronic structure calculations from first principles reveal that the simple cubic struct…
We consider an evolution system, describing the time-dependent behavior of nematic liquid crystals with variable degree of orientation within the continuum model of Ericksen. We establish a dissipation relation and prove both the global existence of weak solutions and the local existence of classical solutions. Furthe…
Nucleation and growth of mullite whiskers in the La 2 O 3− Al 2 O 3− SiO 2 system were investigated in the 1500°–1700°C temperature range. A differentiaC Bhermal analysis (DTA) showed that the mullitization temperature decreases from 1350°C to 1240°C as a result of lanthania doping. In the temperature range of 1250°–1…
A technique to produce carbon by pyrolysis of a positive photoresist on a silicon substrate using a laser beam (laser pyrolysis) is described. The characteristics of the two-dimensional carbon microstructures produced are determined by the motion and power of the laser beam as it traverses the surface of the photoresi…
The trigonal (P-3 m1) modification of Cs 3 Bi 2 Br 9 and Cs 3 Sb 2 I 9 have been studied using NQR, X-ray single crystal and powder pattern methods. Moreover, the heat capacity was measured in a wide temperature interval: 4-300 K. In Cs 3 Bi 2 Br 9 a second-order phase transition was found at T C = 96 K. The low-tempe…
This study determined the influence of moisture, ensiling time and their interactions on the losses of hemicellulose and cellulose during ensiling of orchardgrass. Orchardgrass containing 80 (HM), 70 (MM) and 55% (LM) moisture was ensiled in 3 laboratory silos of 500 ml capacity for 3, 7, 21 and 91 days. The dry matte…
On the basis of laboratory experiments with model mixtures, the steps in the de novo synthesis of halogenated compounds were studied. The study was performed using a thermobalance to evaluate the temperature of the maximum rate and the kinetics of the decomposition of the materials in the presence of air. The effect o…
Phase decomposition in a Ti–13 mass%Nb–13 mass%Zr alloy during isothermal aging at 600°C has been investigated by means of transmission electron microscopy and Vickers hardness measurements. Specimens solution-treated at 1000°C in β phase field were quenched and aged at 600°C in (α+β) region. Beta phase was fully tran…
Abstract The articles in this text have been assembled to give readers an idea of the large number of research possibilities associated with combining electrochemical methods with clay research. The first article is introductory in nature. It describes the common features of the diffuse double layer that intrigue clay…
The debris component of the dislocation substructure in copper single crystals deformed at 78 K was studied by weak-beam transmission electron microscopy. The following defects were identified: primary unfaulted dipoles, faulted dipoles, stacking-fault tetrahedra and defect clusters. It is shown that all these defects…
Fiber fines present in papermaking furnish can have an adverse effect on the productivity of paper machines, especially at high fines levels and in products having high basis weight. The goals of this study are to compare the effects of different types of fine, fibrous material on the ease of water removal from paper…
Superplastic behaviour of Mg-alloy AZ31 was investigated to clarify the possibility of its use for superplastic forming (SPF) and to accurately evaluate material characteristics under a biaxial stress by utilizing a multi-dome test. The material characteristics were evaluated under three different superplastic tempera…
We have grown the compound semiconductor ZnO1—xSex by MBE. A decrease in bandgap energy with increasing Se composition x was observed and a large bowing parameter of 12.7 ± 1.6 eV was measured. This indicates the possibility of bandgap bowing in the ZnO1—xSex compound system and may open up new bandgap control techniq…
The reaction of HNO3 with decane (C10H22) soot generated in the laboratory has been studied in a Knudsen flow reactor. Two different types of soot were produced: Soot originating from a rich flame of decane and air (“grey” soot) and soot generated from a leaner flame of decane and air (“black” soot). Both HNO3 uptake…
Vapor-Grown Carbon Fibers may be modified by surface or temperature treatment to be effective in reinforcing or adding conductivity to polymeric composites.