Materials Literature
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Radiation damage in lithium orthosilicate (Li4SiO4) and Al-doped Li4SiO4 (Li3.7Al0.1SiO4) irradiated with oxygen ions was studied with ionic conductivity measurements, Raman spectroscopy, Fourier transform infrared photo-acoustic spectroscopy (FT-IR PAS) and transmission electron microscopy. It was seen from the ionic…
We have measured the dielectric constants of 6CHBT. The results from studies of various alignments and thicknesses measured under different electric and magnetic fields are presented. We discuss how the dielectric properties depend on boundary conditions, sample thickness and the magnitudes of electric and magnetic fi…
Low temperature (T = 10 K) luminescence decay curves of A2SeCl6 (A = Rb, Cs) are recorded which follow optical excitation at λexc = 458 nm applying different pulse lengths between 90 ns and 100 μs. For short excitation pulses a biexponential decay is observed, for pulse widths t exc > 10 μs a single exponential decay…
A TEM observation and an EDX analysis were carried out on interfaces between Ag-Cu-2wt% Ti alloy and three types of SiC containing B and C, BeO or Al2O3 as additives. They were brazed at temperatures of 850° or 950°C for 30 min. Interfacial structures of the specimens joined at 850°C were SiC (containing B+C)/TiC/Ti5S…
Pyrochlore type Na0.39Bi3.47O7 containing Bi5+ was prepared by low temperature hydrothermal reaction using hydrated sodium bismuth oxide, NaBiO3⋅nH2O, as a starting material. The mean valence of Bi in the pyrochlore is 3.94. The X-ray powder pattern for the pyrochlore was indexed in the cubic system with a=10.943(8)Å.…
Article Influence of the Cyclic Hydriding-Dehydriding Treatment on Pressure-Composition-Temperature Relations of the LaNi5 — H System* was published on January 1, 1993 in the journal Zeitschrift für Physikalische Chemie (volume 179, issue 1-2).
Composite alumina ceramics with a mullite whisker content of up to 30vol% were fabricated by hot-pressing at 1400 to 1600°C under 30MPa for 30min. The bending strength, hardness, elastic modulus and fracture toughness of the hot-pressed bodies were investigated. Considerably dense alumina-mullite whisker composite cer…
Abstract This paper discusses a generalized method to measure with the electron probe microanalyzer (EPMA) the oxygen in a material containing a surface oxide layer. The continuum background is the most difficult to measure, particularly for materials in which oxygen‐free samples cannot be produced. The method depends…
Abstract
An integral transform analysis of the static scattering of the two-dimensional potential radiated by a line source in the vicinity of a penetrable wedge is presented. The Mellin transform is used to derive the exact static solution to Laplace's equation for the dielectric wedge, in the form of a modal series. The impo…
Abstract In the present study, the hybird behavior of surfacetreated mica and hardwood chemithermomechanical pulp (CTMP) in PVC composites was investigated. In order to improve the compatibility of wood fibers with PVC and surface-coated mica, CTMP was subjected to different surface modifications by pretreating the fi…
The synthesis of three analogues of pyrochlorophyll a with the selective removal of the carbonyl functions is described; 7-despropionate-7-propyl-mesopyrochlorophyllide a (DPC), methyl 9-desoxo-mesopyrochlorophyllide a (DOC) and 9-desoxo-7-despropionate-7-propyl-mesopyrochlorophyllide a (DODPC), were prepared from met…
Detailed measurements of the frequency- (50 Hz to 10 kHz) and temperature (80 loss (\ensuremath{\epsilon}'') have been performed for the ${\mathrm{Bi}}_{4}$${\mathrm{Sr}}_{3}$${\mathrm{Ca}}_{3}$${\mathrm{Cu}}_{\mathit{y}}$${\mathrm{O}}_{\mathit{x}}$ (y=0 to 5) glasses. Some of these glasses become high-temperature sup…
It is well known that caliper readings decline after the initial application of the caliper to the skinfold (dynamic compressibility). In addition to this compressibility, there is also a variability of skinfold compressibility at different body sites (static compressibility). To investigate this static variability, a…
Wood-plastic composite (WPC) has been made by impregnating methylmethacrylate (MMA) monomer into simul, a native timber of Bangladesh, under Co-60 γ radiation. The effect of moisture and heat and humidity on simul and its WPC is investigated as a simulating phenomenon of the sunlight, rain, and moisture to which timbe…
Treatment of silica gel that has SiH functional groups bonded to the surface, with methanolic PdCI2 and then aqueous Hg2S04 affords a new catalytic material for the chemo- and stereo-selective partial hydrogenation of alkynes to Z-alkenes with a high degree of functional group compatibility.
Spiropyran-modified Concanavalin A (Con-A) displays photoregulated binding towards α-D-mannopyranoside, the photostimulated binding of the substrate originating from a structural perturbation of the protein upon photoisomerization of spiro-Con-A to the zwitterionic Con-A; time-resolved light scattering reveals that th…
The reaction of tetramethyltetrathiafulvalene (TMTTF, 7) with 2-dicyanomethyleneindane-1,3-dione (DCID, 1) leads to isomerisation of DCID to 2,3-dicyanonaphthoquinone (DCNQ, 3) to yield the charge-transfer complex [(TMTTF)3]2˙+–(DCNQ˙–)28. The X-ray crystal structure of complexe 8 reveals stacks of TMTTF molecules alo…
The importance of polarized light microscopy (PLM) for the study of the domains and phase transitions of ferroelectric and ferroelastic single crystals is pin-pointed and the experimental set-ups for observations and measurements between 4 and 1600K are outlined. The contrast formation between domains by spontaneous b…
X-ray photoelectron spectroscopy was used to analyze a thin film of polymethylmethacrylate (PMMA) which was spin cast from a 2% weight solution of PMMA in toluene onto a gold substrate. A Hewlett Packard 5950A ESCA spectrometer was used for this investigation.