Materials Literature
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Temperature dependence of the Debye-Waller factors in EXAFS is studied for monatomic fcc lattice by use of the perturbation approach in terms of temperature Green's function. We apply the theory to the temperature dependence of EXAFS for Kr and Ni crystals. Furthermore we make a comparison among sc, bcc and fcc lattic…
Abstract Quantitative X-ray microanalysis requires the use of many fundamental constants related to the interaction of the electron beam with the sample. The current state of our knowledge of such constants in the particular areas of electron stopping power, X-ray ionization cross-sections, X-ray fluorescence yield, a…
Effects of (i) local magnetic ordering, (ii) lattice distortions, and (iii) Mn 3d - O 2p hybridization on the shape of Mn K- edge XANES spectra of La1-xCa(x)MnO3 have been evaluated numerically and compared with available experimental data. We calculated the spin-polarized Mn K-edge spectra. An energy splitting betwee…
Polycrystalline lead iodide, PbI 2 , was recrystallized from hot water to reproducibly obtain flat plate-like crystals, which manifested extreme preferred orientation greatly favoring the 001, 002, 003, and 004 planes. Polycrystalline samples of PbI 2 were intercalated with tripropylamine, simultaneously producing a “…
Rates of continuous tritium recovery from a Flibe stream are calculated for a permeation window and a counter-current gas-bubble column. The area of the permeation window is estimated to be comparatively small unless very low tritium partial pressure is demanded for the system. It is probable that the tritium transfer…
The nuclear performance of the thin Convective Liquid Flow First Wall (CLiFF) concept is investigated. Liquid walls offer the advantage of protecting solid structure behind them from excessive damage from neutrons originated in the plasma and thus have the capability for high power density applications; the central re…
This paper presents an innovative dilatometer that can measure the pressure-volume-temperature (PVT) properties of polymer/CO2 solutions in a molten state. The basic rationale of the design is to determine the density (or equivalently, the specific volume) of a polymer/CO2 solution by separately measuring the mass and…
Two new mesogenic homologous series having following general structural formula have been synthesized. In series-I, n-octyloxy and n-dodecyloxy derivatives exhibit enantiotropic smectic A phase whereas n-decyloxy and n-tetradecyloxy derivatives exhibit monotropic smectic A phase, rest of the members are non-mesogenic.…
This paper describes the processing of biodegradable polymers in the meltblowing process. The processing of such materials is still in the development stages as their rheological behavior gives a strong restriction for such applications. Meltblowing experiments were carried out with different polymers, including polyl…
This paper presents a review of works concerning the combustion of polymers with various intumescent systems. In this review intumescent systems are considered which undergo charring and foaming upon thermal degradation, forming a blown protective cellular char. The reasons are discussed of action of various additives…
Abstract Cashew and passion fruit juice drinks were aseptically filled in cartons and in three types of plastic packages (with oxygen transmission rate‐OTR of 1,40; 2,96 and 13,74 cm 3 (STP)/m 2 /day at 25 °C, 75% RH and 1 atm), with nitrogen gas flushing. No adverse effect on product sterility was found, neither were…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Novel Ladder Polymer Electrolytes Bridged by Sulfonio and Imino GroupsKenji Miyatake, Allan S. Hay, Fumio Mitsuhashi, and Eishun TsuchidaView Author Information Department of Polymer Chemistry, Advanced Research Institute for Science and Engineering, Waseda Univers…
Single crystals of tribarium gallate (Ba3Ga2O6) have been synthesized from a melt with composition 70 mol.% BaO and 30 mol.% Ga2O3 in the temperature range between 1200 °C and 1400 °C. The compound adopts space group Pa with a = 16.746(9) Å and Z = 24 formula units per unit cell. The refinement of the atomic parameter…
In this paper, the development of diameter and surface temperature of Lyocell fibers was measured online. The diameter and tensile force on the spin line in the coagulation bath were traced. The velocity, velocity gradient and the tensile stress profiles development of the fibers in the air gap were studied. The appar…
We have investigated a soluble and processable poly(p-phenylene) (PPP) having two pendant imide groups. A novel π-conjugated PPP was prepared by dehalogenation polycondensation of a dibromo aromatic compound with a zerovalent nickel (Ni(0)) complex. The monomer and polymer were characterized by 1H NMR, FT-IR, elementa…
To study the influence of the crack speed at initiation on measurements of the toughness of amorphous polymers such as polycarbonate (PC) and rubber toughened poly(methyl methacrylate) (RTPMMA), ‘compact tension’ specimens were tested at a medium loading rate (0·6 m s-1 ). The specimens were equipped to allow location…
Methods of X-Ray and Neutron Scattering in Polymer Science , Ryong-Joon Roe Oxford U. Press, New York, 2000. $80.00 (331 pp.). ISBN 0-19-511321-7 Buy at Amazon
This article is devoted to the investigation of multilayer diffraction grating of Al/GaAs using spectroscopic ellipsometry. The ellipsometric parameters ψ and Δ were measured under conditions of surface polariton excitation, as well. Various representations of the dielectric function for the analysis of optical data o…
The superconducting windings of the air-core superconducting power transformer have possibilities of being exposed to a higher magnetic field than those of the iron-core transformer because of no special paths for magnetic flux. Thus, in this paper, the magnetic field and electromagnetic force acting on the windings o…
We studied the influence of the annealing temperature on the atomic structure of yttria‐stabilized tetragonal zirconia (YSZ) which was deposited as a 300 μm thick thermal barrier coating (TBC) on nickel superalloy substrates by plasma spraying. To obtain neutron powder diffraction patterns of the barrier coatings we u…