Materials Literature
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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…
Production ball grinding and polishing apparatus were employed as tribometers. The volumetric wear rates of near-net-shape silicon nitride (Si3N4) ceramic ball blanks and the sphericity of the final-polished bearing balls were used to examine the premises that only homogeneous Si3N4 with isotropic structural integrity…
Amphilphilic tetraphenylporphin derivatives having four dialkylglycerophosphocholine groups on the ring plane (lipid-porphyrins) form spherical unilamellar vesicles of diameter ca. 100 nm in water; the vesicles composed of lipid–porphyrinatoiron(II)–1-dodecylimidazole (DIm), can bind dioxygen reversibly in aqueous med…
The reaction between tetraphenylphthalonitrile and phthalonitrile in the presence of copper(I) chloride gives a non-statistical mixture of phthalocyanines from which the tetraphenyl-substituted compound 3 can be isolated.
The CONTAIN computer code is a best-estimate, integrated analysis tool for predicting the physical, chemical, and radiological conditions inside a nuclear reactor containment building following the release of core material from the primary system. CONTAIN is supported primarily by the U. S. Nuclear Regulatory Commissi…
Abstract The temperature-programed desorption (TPD) of hydrogen adsorbed at various temperatures and at nearly saturated coverage has been used to characterize the surface of nickel particles dispersed on silica gel. The TPD spectra have two major peaks, the first and second peaks, at about 375 and 560 K. The second p…
Improvement of the siloxane layer on minerals by using a bisfunctional silane, such as 1,6-bis(trichlorosilyl) hexane and 1,8 bis(trichlorosilyl)octane, and the effects on adhesion of methacrylic resin to glass plates treated with the silanes were studied. The tensile bond strength of the resin to the glass plate trea…
The structural and functional properties of chloroplast glyceraldehyde-3-P-dehydrogenase I (D-Glyceraldehyde-3-phosphate: NADP oxidoreductase (phosphorylating) EC 1.2.1.13) from Spinacia oleracea were investigated by limited proteolysis. The enzyme is insensitive to trypsin and chymotrypsin, while Staphylococcus aureu…
Two experimental techniques—time domain spectroscopy (TDS) and a steady state frequency method—have been used to study dielectric spectra for the isotropic, nematic, SA, SC and SY phases of two thioesters (4-n-pentylphenyl-4′-n-octyloxy-and 4′-n-nonyloxythiobenzoates (C n H2n+1 O‒C6 H4‒COS‒C6H4‒C5H11, where n = 8 and…