Materials Literature
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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.
Results are reported of energy minimizations and molecular-dynamics calculations for chlorine physisorbed on the basal plane of graphite. The dispersion-repulsion component of the intermolecular potential is modelled by an anisotropic site-site potential and the permanent electrostatic potential is represented by dist…
Microstructure of the Zn-bonded Sm2Fe17N3 permanent magnet having high magnetic coercivity of 11.8 kOe was studied by transmission and analytical electron microscopy. Three phases, α-Fe including 20 to 30 at%Zn, Fe3Zn7, and Sm2(Fe, Zn)17Nx, were found in addition to the matrix Sm2Fe17N3 phase. The Sm2(Fe, Zn)17Nx phas…
Abstract The dielectric constant, loss tangent and AC conductivity of solution grown cellulose acetate‐butyrate films of 5μm thickness were studied as a function of temperature (300‐450 K) in the frequency range 10 Hz‐10 MHz. The decrease in dielectric constant was observed with the increase in frequency as well as wi…
The reactions of MCl3(M = As or Sb) and 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane (tetramethylcyclam, L) have been studied under controlled hydrolysis conditions as a route to anionic bridging chlorooxo arsenic- or antimony-(III) species. With M = As, the ionic complex [H2L][As4O2Cl10]1 has been isolated…
Abstract Single crystals of beta barium borate and potassium pentaborate (commonly known as β‐BaB 2 O 4 or BBO and KB 5 O 8 . 4 H 2 O or KB5) were grown by high and low temperature solution growth methods, respectively. The dielectric constant and loss tangent were determined as a function of temperature. Frequency re…