Materials Literature
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Abstract A linear relationship exists in oxide glasses between glass transition temperature (T g ) and quadrupole splitting (Δ) of Fe 3+ . DTA and Mössbauer measurements of silicate and tungstate glasses yielded large slopes of 680 and 260 °C/(mm s -1 ) from the slope of the straight lines when Fe 3+ occupied, as netw…
This paper deals with the spherically symmetric Stefan problem in three space dimensions. The melting temperature satisfies the Gibbs–Thomson law. The solution is obtained as a limit of solutions of similar problems containing a small additional kinetic term in the melting temperature. Under some structural assumption…
Elastomer–elastomer joints are a special case of polymer bonding. Interfacial adsorption, molecular interdiffusion, and entanglements, as well as chemical bonding, are the different mechanisms which intervene in adhesion phenomena. Their relative contribution is not well known and depends on many parameters. If the fo…
A noise analysis for a planned PIN diode X-ray detector array using CMOS technology explores the affect of allowed device dimensions on attainable energy resolution using a methodology which allows low frequency, process dependent 1/f and 1/f/sup 2/ terms to be explicitly evaluated for arbitrary noise filters. We find…
The authors intend the book to be an introduction to the field of radiation protection dosimetry. Having just been published last year, the book is able to take into account all the changes and developments that have come in recent ICRP and ICRU reports. The book is aimed at graduate students or as a reference work fo…
We report an experimental study on the pattern dynamics of the salt-crystal (NaCl) surface when dissolved from below by its own aqueous solutions with mass concentrations between 0.0% and 24.0%. The surface pattern roughness grew exponentially for a range of unstable wave numbers with a fastest growing wave number ${k…
We have made extensive studies of the charge-carrier mobilities in the discotic hexagonal mesophases of triphenylene-based discotic liquid crystals. Using the time-of-flight technique, transient photocurrents were measured yielding charge-carrier mobilities for various electric fields and temperatures. Starting from p…
Solid forms fixing nuclides were produced from Cs-mordenite and Sr-zeolite A by calcination at 1,200°C for 1 h. Cesium and strontium were uniformly dispersed in pollucite (CsAlSi2O6) and Sr-feldspar (SrAl2Si2O8), respectively. Compressive strength of the products increased with decreasing particle size of starting zeo…
The permeability variations of carbon dioxide, oxygen, and nitrogen through isotactic polypropylene, heterophasic ethylene-propylene (E-P) copolymers, and polyethylene films were measured during photo-oxidation using polychromatic light at 60°C in air. For polypropylenebased samples the permeability decreases with inc…
A thin film‐of zinc octakis (β‐octyloxyethyl) porphyrin (ZnOOEP) is capable of trapping and detrapping charge in an appropriate electric field under irradiation. An effective charge capacity of the order of 30 μC/cm 2 or 10 18 charges/cm 3 was obtained with sandwich structures of ITO/ZnOOEP/ITO (where ITO is indium ti…
The line-beam response function, needed for skyshine analyses based on the integral linebeam method, was evaluated with the MCNP Monte Carlo code for photon energies from 20 to 100 MeV and for source-to-detector distances out to 1000 m. These results are compared with pointkernel results, and the effects of bremsstrah…
A new “incipient‐wetness” method is proposed for the synthesis of chemically stabilized β‐cristobalite (CSC) that avoids the need to handle liquid phases as required by the sol‐gel routes proposed in the literature. Stoichiometric compounds with the composition Si 1–x Al * x Ca 1/2 O 2 have been investigated. ×= 0.07…
The fatigue crack growth characteristics of a Ti–15–3 matrix/SCS–6 fibre composite containing an unbridged defect under tension–tension loading were investigated as afunction of load range, load ratio, temperature, and specimen size. The results obtained and trends observed were compared with earlier data for the same…
Two of the larger features in the infrared conductivity spectra of χ-(ET)2Cu[N(CN)2]Br are analysed and one is reassigned with the aid of infrared and Raman spectra of isotopically-substituted compounds.
The effective tritium system should be designed to recover tritium from DT reactor blanket sweep gas in a form that is easy to transfer to the main fuel cycle. The cryosorption method using a porous adsorbent at the temperature of liquid nitrogen is one of the candidate processes for extracting tritium from the sweep…
Abstract This study is designed to evaluate the role that lubricants have in the processing and final cell morphology of extruded rigid PVC foam. By developing a standard formulation in which only the type of lubricant was varied, the direct effects of functionality of the lubricant could be observed. It was found tha…
Bis(2-aminobenzthiazolyl) sulphone (BABS) was used as a new starting material for preparing polyamides. These polyamides were prepared by reacting BABS with adipoyl, sebacoyl, isophthaloyl and terephthaloyl dichlorides, and also with 4,4′-azodibenzoyl chloride or 3,3′-azodibenzoyl chloride, utilizing the solution poly…
In this, the third Finniston Lecture, the recent advances in aero engine technology made possible by interdisciplinary collaboration between materials scientists and design and manufacturing engineers are reviewed. Of crucial importance is the efficient and cost effective design of component geometries with due regard…
Abstract Magnesiumphthalocyanin reagiert mit überschüssigem Tetra(n‐butyl)ammonium‐ oder Bis(triphenylphosphin)iminiumhalogenid (( n Bu 4 N)X oder (PNP)X; X = F, Cl, Br) zu Halogenophthalocyaninatomagnesat ([Mg(X)Pc 2− ] − ; X = F, Cl, Br), welches teilweise als wenig lösliches ( n Bu 4 N)‐ oder (PNP)‐Komplexsalz kris…
Abstract Die Darstellung von Tris(2,2,6,6‐tetramethylpiperidino)indium 1 und von Bis(2,2,6,6‐tetramethylpiperidino)‐indiumbromid 2 werden beschrieben. Beide Verbindungen wurden NMR und massenspektroskopisch untersucht. Sie liegen in Lösung und Gasphase monomer vor. Die Analyse der Kristallstruktur von 1 belegt dessen…