Materials Literature
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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…
The effects of surface microstructure and chemical compositions of steels on characteristics of Fe-Zn intermetallic phases formed on continuously galvanized steel sheets have been investigated, using ultra low carbon and low carbon steels.From a SEM observation, the morphology of Fe-Zn IMP formed at interface between…
A study has been made which correlates grain size with magnetic properties so that the proper range of grain size in ferrite materials can be determined for recording head applications. The effects of Ni-Zn and Mn-Zn ferrite grain size on 1) initial permeability, 2)B-Hloop, 3) density of ferrites, and 4) core processi…
Abstract 2‐Vinyllhiolane‐1,1‐dioxide (Ia) and 2‐vinylthiane‐1,1‐dioxide(Ib) have been prepared and polymerized with free radical initiators to obtain poly(sulfonyl‐hex‐2‐enylene) (IIa) and poly(sulfonyl‐hept‐2‐enyIene‐ co ‐2‐vinylthiane‐1,1‐dioxide) (IIb), respectively, via a ring‐opening mechanism. Structures of the…
Studies of the silicon absorption spectrum above the K-edge in crystalline silicon carbide SiC and in pure crystalline silicon are reported. We show that for these systems, no high order scattering is needed to interpret the experimental results down to few eV above the edge. This behaviour can be explained assuming,…