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The bend (K33) and splay (k11 elastic constants of octylcyanobiphenyl have been measured as a function of temperature using the electric field induced Freedericksz transition. We have made simultaneous measurements of the dielectric constants and birefringence of 8CB using a cell with homogeneous alignment. Dielectric…
Experiments on a series of pure Fe–C alloys consisting of ferrite and pearlite only have shown that the ferrite/pearlite and pearlite/pearlite interfaces are effective hydrogen trapping sites. The ferrite/cementite interfaces within the pearlite colonies, however, have little effect on the hydrogen occlusivity. With a…
The kinetics of in vitro fibril assembly of Type I collagen preparations that contain different amounts of covalently cross-linked oligomers was studied with turbidimetry. Fibril formation showed a lag phase with no solution turbidity and a growth phase with a sigmoidal increase in the solution turbidity. The length o…
ABSTRACT Pyrolysis experiments were performed on Green River and Monterey Formation kerogens (Types I and II, respectively) with and without calcite, illite, or montmorillonite at 300 °C for 2 to 1,000 hours under dry and hydrous conditions. Pyrolysis products were identified and quantified, and a material balance of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSynthesis and characterization of a meso-tetrakis(4-ferrocenylphenyl)porphyrin and examination of its ability to undergo intramolecular photocatalyzed electron transferErnst S. Schmidt, Thomas S. Calderwood, and Thomas C. BruiceCite this: Inorg. Chem. 1986, 25, 20, 3718–3720Publ…
The erosion-corrosion of vertical 38-mm diameter pipes carrying aerated slurry (20 vol% – 30 + 50 mesh silica sand) in 3.13% NaCl solution at 2 to 6 m/s has been measured by weight loss measurements over periods of 100 h. Electrochemical methods have been applied to clarify the mechanism of the process and to determin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of crystallite size and support on the carbon monoxide hydrogenation activity/selectivity properties of iron/carbonValiant K. Jones, Loren R. Neubauer, and Calvin H. BartholomewCite this: J. Phys. Chem. 1986, 90, 20, 4832–4839Publication Date (Print):September 1, 198…
Scale microfossils are locally abundant in rocks of the uppermost Tindir Group and basal beds of the overlying Funnel Creek Limestone in northwest Canada. Co-occurring organic-walled fossils in this microbial mat biota resemble forms described from the Upper Proterozoic but mineralized spicules of Cambrian aspect are…
Abstract A method is given for quantitative analysis of IR spectra of dioctahedral micas in the OH-stretching region, which involves spectral decomposition and correlation of octahedral cation contents with integrated optical densities of the corresponding bands. It provides a basis for the study of order-disorder in…
An engineering fracture mechanics approach was applied to the analysis of the fracture resistance of equine hoof-wall. The relationship between fracture toughness and the morphological organization of the keratin hoof tissue was investigated. Fracture toughness was evaluated using the J-integral analysis method which…
Abstract The mechanism of Ni-Mg substitution has been studied by X-ray absorption spectroscopy in phyllosilicates belonging mainly to the lizardite-nepouite and kerolite-pimelite series. Two types of information were obtained: (1) Analysis of nickel K -edge spectra under high resolution confirmed that Ni atoms were su…
The self consistent field multiple scattering Xa model has been used to calculate the electronic structure and the magnetic coupling constant, J , of planar and pseudotetrahedral [ C U ~ C I ~co]m~p-l exes with the aim of exploiting the actual possibilities of the model to describe the spectral (electronic and EPR) an…
Abstract A novel approach to the determination of crystallite size and lattice strain by means of Total Pattern Analysis is described. Parameters to define the position, magnitude, breadth and shape of individual peaks are obtained by an adaptation of the pattern fitting program of Sonneveld and Visser ( J. Appl. Crys…
Highly conductive and transparent films of Si-doped ZnO have been prepared by rf magnetron sputtering of a ZnO target with SiO 2 or SiO dopant added. Films with resistivity as low as 3.8×10 -4 Ω cm and average transmittance above 85% in the visible region can be produced on low temperture substrates at below 250°C. Gr…
Peroxotungstic acid coated films were investigated for applications to electrochromic display devices. Films coated with peroxotungstic acid aqueous solutions exhibited electrochromism in non-aqueous electrolyte solutions containing Li-salts. A good reversibility for the electrochromic reaction was attained after seve…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUniversal scaling equation for self-diffusion by macromolecules in solutionGeorge D. J. PhilliesCite this: Macromolecules 1986, 19, 9, 2367–2376Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Published inissue 1 September 1986https://d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural studies of the hydrogen storage material magnesium nickel hydride (Mg2NiH4). 2. Monoclinic low-temperature structurePeter Zolliker, K. Yvon, J. D. Jorgensen, and F. J. RotellaCite this: Inorg. Chem. 1986, 25, 20, 3590–3593Publication Date (Print):September 1, 1986…
Abstract Strontium cobaltates in the composition range, SrCoO 2.29 ‐SrCoO 2.80 , have been prepared under various conditions with respect to the oxygen pressure and temperature. Samples prepared at high temperatures (above 800°C) crystallized in the brownmillerite or perovskite type Structure Depending on oxygen Defic…
Abstract γ‐phase crystals of isotactic polypropylene (iPP) obtained from low‐molecular‐weight extracts of pyrolyzed polymers are examined by electron microscopy and electron diffraction. γ‐phase crystals differ from α‐phase crystals in three important respects: (i) they are elongated along the b * rather than the a *…
The influence of skin friction on the perception of fabric texture and pleasantness (acceptability) was studied by exposing eight men to a sequence of environmental conditions: neutral (comfortable), hot-dry, hot-humid, and return to neutral. The air and dew point temperatutes ( T a : T dp ) of these conditions were 2…