Materials Literature
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The structure of a hybrid aligned cholesteric liquid crystal sample is investigated both experimentally and theoretically. At small thickness the cell presents a structure characterized by unidimensional deformation - uniform (in the xy plane) structure. This structure is described theoretically and numerical results…
Thermal degradation and thermal oxidative degradation characteristics of Plexiglas G and Lucite were determined using thermogravimetry. The results show that degradation rate of Plexiglas G is sensitive to gas phase oxygen but that of Lucite is much less so. Comparison of derivative thermogravimetry curves between the…
X-Ray photoelectron spectroscopy has been used to characterise the uranium oxide β-U3O7, and binding energy values for core and valence electrons have been determined. β-U3O7 is shown to exhibit a unique X-ray photoelectron spectrum which is sensitive to changes in stoichiometry induced by exposure to oxygen and vacuu…
Poly-β-hydroxybutyrate (PHB) and its copolymer, poly (-β-hydroxybutyrate-β-hydroxyvalerate) P(HB-HV) are thermoplastic polyesters produced by bacterial fermentation. Because of bacterial origins PHB and its copolymers are very pure. Lamellar thickening behaviour of these polymers is expected to be almost ideal so that…
Abstract The distribution of citrate dithionite and ammonium‐oxalate extractable Fe 2 O 3 and Al 2 O 3 were determined in nine Coastal Plain pedons of southeastern Nigeria. Distribution of available, organic, and active inorganic forms of P, plus the P fixation and available water holding capacities of these soils wer…
Article Catalytic Enzyme Activity Concentration in Tissues of Man, Dog, Rabbit, Guinea Pig, Rat and Mouse. Approach to a Quantitative Diagnostic Enzymology, III. Communication was published on January 1, 1986 in the journal Clinical Chemistry and Laboratory Medicine (CCLM) (volume 24, issue 1).
A final report is presented of a combined experimental and analytical investigation of the quench characteristics of packed beds of superheated particles which are cooled by water supplied by an overlying pool. The objective of the work was to develop a model, for use in containment loading calculations with codes suc…
A. Rogerson, A. S. W. DeFreitas, A. G. McInnes, Observations on Wall Morphogenesis in Coscinodiscus asteromphalus (Bacillariophyceae), Transactions of the American Microscopical Society, Vol. 105, No. 1 (Jan., 1986), pp. 59-67
Sterically hindered porphyrins having a fully hydrophobic cavity have been prepared. The cavity is capped with a 2,3,5,6-tetramethylbenzene moiety containing at the 1,4-positions methylene —(CH 2 ) n — chains (n = 4, 5, 7) bonded at trans pyrrole rings of a porphyrin that is alkylated with methyl or ethyl groups at th…
The title compound photocyclises to a deep blue solvatochromic 1,8a-dihydronaphthalene (1,8a-DHN), which undergoes a thermal 1,5-H shift to yield a colourless 1,2-DHN, in addition to thermal ring-opening. The rates of these competitive reactions have been determined by measuring the thermal fade rate of the correspond…
The amount of 14C in low-level radioactive wastes is important for determining the future impacts of their disposal. New regulations in the Code of Federal Regulations, Title 10, Part 61 (10 CFR 61) require quantitation of 14C and other radionuclides in such wastes not amenable to measurement by gamma spectroscopy. Sa…
The kinetics and mechanism of the thermal decomposition of sodium sulphide pentahydrate to an essentially anhydrous form was investigated, in the pressure range 3–20 Torr, using thermogravimetry and X-ray powder diffractometry under controlled temperature and water vapour pressure. A two-step dehydration reaction path…
The magnetic phases of the solid-solution system ${\mathrm{Eu}}_{\mathrm{x}}$${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$S are analyzed by ac susceptibility, magnetization, and specific-heat measurements. The dominant contribution to the exchange interactions ${\mathrm{Eu}}_{\mathrm{x}}$${\mathrm{La}}_{1\mathr…
Explicit nodal weight functions for a pair of symmetric radial cracks emanating from a hole in a plate are presented with special emphasis on the load-independent characteristics of the explicit weight functions that can obviate repeated calculations of the Mode I stress intensity factors (KI) under different loading…
The reduction of metallic oxides with the reducing gas and recyclic use of the metallic oxides were investigated as an elemental study of looping combustion process newly developed for efficient utilization of thermal energy(i.e., the three stages of combustion: steam-reforming of fuel at low temperature, reduction of…
A number of hydroxamic acids have been investigated for the extraction of chromium(III) from chrome tanned leather waste. Benzohydroxamic acid (BHA) was the most suitable chelating agent and preliminary experiments showed that the extracted chromium(III) has potential tanning capacity. Approximately 90% of BHA was rec…
Factors affecting oil separation from surfactant-free dispersed oil-water mixture in a mixing tank by a poly(tetrafluoroethylene) (PTFE) membrane separator unit were investigated. The typical unit consisted of a sheet of porous PTFE membrane, a PTFE filter paper and an acrylic perforated plate. The separation process…
Experimental fouling data have been analyzed on the basis of the change in overall heal transfer coefficient of the fouling test section. It is assumed that thermal hydraulic conditions in the test section remain reasonably constant for the duration of a fouling test. The model ofTaborek et al.|I| is used, and two par…
The crystal structure of β -Mg 2 PO 4 OH ( P 2 1 / c , a = 9.656(3), b = 12.859(3), c = 12.069(4) Å, β = 108.49(3)°, Z = 16) has been refined isotropically to a final R -value of 0.052 for 1863 high-angle reflections. Fairly regular PO 4 tetrahedra, distorted cis -MgO 4 (OH) 2 octahedra, and distorted MgO 4 (OH) trigo…
Based on the ionic group theory, the SHG coefficients of KB5 crystal have been calculated, which leads to the following values d31=2.61×1010 esu, d32=0.07×1010 esu and d33=3.26×1010 esu. They agree fairly well with the expeimental ones. Our calculation results indicate that the hydrogen bond of (B5O10) ionic group has…