Materials Literature
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Specific heat data (at zero field and 21.7 kV/cm) and electrocaloric data (field strengths up to 23.5 kV/cm) were measured on the same sample of a carefully prepared SrTiO3 ceramic between 2-30 K. A field-dependent maximum in CT-3 at 23 K is due primarily to a large density of acoustic phonons at 70 cm-1 and to the fi…
info:eu-repo/semantics/published
It is suggested that the damping affecting the forced radial oscillations of gas bubbles can be determined very accurately through the measurement of the subharmonic threshold for the oscillations. The advantage of the method is that, while the subharmonic oscillations have a large amplitude and can be easily detected…
Experiments on electroforming of Metal‐Oxide‐Metal thin film sandwiches which have been electroformed to exhibit voltage‐controlled negative resistance are summarized and an outline of recent evidence in favour of localized or filamentary conduction is given. A similar review is given of the experiments on oxide sandw…
The temperature dependences of optical phonon mode frequencies near Tc in TGS/TGSe were observed by using polarized Raman and infrared spectroscopy and were classified into four categories. Two of these categories are discussed in this article.About five out of 177 observed modes demonstrate a strong frequency shift b…
This paper explores the concept of a ferroelectric glass and finds no fundamental objection to the concept. The essential ingredient is a dielectrically soft local atomic configuration which remains identifiable, though possibly badly distorted, in the glassy matrix. A specific model of such a glassy phase is construc…
This paper is a detailed version of a recent preprint wherein the above topic was analysed rather concisely. A pedagogical introduction to homotopy theory is followed by its applications to the study of non-singular configurations in ordered systems such as 3He-A, nematic liquid crystals etc. The role of the hamiltoni…
Long term immersion testing has been carried out of stressed, austenitic steel samples (304S15) in chloride solutions of varying strength, type, temperature and pH. Types of corrosion produced were noted and the influence of the various solution parameters on the incidence of stress corrosion cracking and localized co…
DTA, TG, and TMA curves of commercial Kevlar® 49 and Nomex® fibers have been used to assess their behavior at high temperatures. The fibers lost absorbed water around 100°C, and a glass transition was reflected in the DTA and TMA curves in the region of 300°C. Difficulties in the interpretation of DTA and TMA curves i…
Description A current worldwide review on traditional indicators used in water quality assessment. 25 papers cover automated monitoring techniques, classifications of environmental enteric strains, r-factors and salmonellae, use of bacteria in evaluation of water quality and water.
Dehydroxylation phases of a kaolinite from Zettlitz, Czechoslovakia, were investigated by radial electron density distribution (RED) and X‐ray spectroscopy. Special emphasis was placed on the 2 amorphous or poorly crystallized transition phases, i.e. metakaolinite (600° to 800°C) and the spinel structure (900°C). The…
With the help of the PLK coordinate perturbation technique the equation of motion of a spherical bubble in a viscous compressible liquid is derived by taking account of the gas density inside the bubble, and the effects of the liquid compressibility on the variations of the bubble radius, bubble wall velocity and bubb…
Abstract Characteristic features of isothermal growth, thickening, and melting of melt‐grown single crystals of poly(ethylene oxide) fractions, as reported in a recent paper, are complemented and further discussed. A newly discovered phenomenon–isothermal superheating–is described and its implications are discussed. G…
Abstract
The effects of additions of nickel to magnesium over the composition range from 0 to 40.41% and of copper, aluminium, and tin to magnesium by 15.10%, 18.40%, and 21.40%, respectively, on the internal friction and Young’s modulus have been investigated by use of the flexural vibration method at room temperature. It was…
A mechanochemical method was developed for studying the enzymatic degradation of insoluble collagen fibers. The method involves stretching the collagen fiber to a fixed extension in the presence of a solution of collagenase and measuring the rate of relaxation of the force induced in the fiber. In this work, bacterial…
Abstract BF 2 complexes of alkylated pyrromethenes were prepared by reacting the corresponding pyrromethenes with BF 3 ·OEt 2 under basic conditions. A striking aspect of these complexes is a pronounced fluorescence in organic solvents, even at room temperature, with fluorescence quantum yields between 0.3‐0.8. The ef…
A technique for testing materials in sea water under velocity conditions has been developed which utilizes fluid dynamics to evaluate the corrosion test results. The data obtained from this technique may then be applied to other hydrodynamic systems where the fluid dynamics equations are known. This allows high veloci…
A comprehensive review is presented of the present state of our knowledge in the science of clothing comfort. Information is given on thermal comfort factors and concepts, physiological aspects, use of acoustic testing to predict clothing comfort properties, comfort finishing (synthetic fabrics), cotton and cotton ble…
Under anaerobic conditions, cells of Entamoeba histolytica grown with bacteria produce H2 and acetate while cells grown axenically produce neither. Aerobically, acetate is produced and O2 is consumed by amebae from either type of cells. Centrifuged extracts, 2.4 x 106 x g x min, from both types of cells contain pyruva…