Materials Literature
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A sample of the natural type IIa diamond was pre-irradiated in a nuclear reactor and then annealed under isothermal conditions at 550°C. The experimental data were used to calculate a decrease in concentration of the neutral vacancy defect called GR1, corresponding to a phononless band (PLB) at 741 nm, and an increase…
The effects of substituting chromium for iron and the use of low cost ferrochromium alloys in the production of β-Ti–Fe–Cr alloys have been studied with respect to phase constitution, stability, and mechanical properties, in solution treated and quenched states using resistivity, hardness measurement, X-ray diffractio…
Several methodologies to produce α-terpinyl chloride from “hydrochlorination” of limonene were studied and the best results were obtained by reaction with 0.5 mol equiv. SOCl2 in SiO2 / CH2Cl2. Using this methodology (R)- and (S)-α-terpinyl chloride can easily be prepared in good yields from (R)- and (S)-limonene, res…
Abstract Selective-dissolution techniques by ammonium oxalate (OX), dithionite-citrate-bicarbonate (DCB), and dithionite-ethylenediaminetetraacetic acid (D-EDTA), and X-ray diffraction and Mössbauer spectroscopy were used to identify and characterize iron oxides and oxyhydroxides in the <2-mm, <50-μm, and <2-…
Systematic fatigue experiments, including both high‐cycle axial fatigue ( S – N curves) and fatigue crack growth (FCG, d a /d N –Δ K curves), were performed on a precipitation‐hardening martensitic stainless steel in laboratory air and 3.5 wt% NaCl solution. Specimens were prepared in three tempers, i.e. solution‐anne…
Micrometer sized multi-hollow spheres of epoxy resin were prepared by a physical method so-called phase inversion emulsification technique. The formation mechanism of the titled spheres was studied by incomplete phase inversion. The requisite for the formation of multi-hollow spheres was that irreversible coalescence…
The appearance of dry bands on polluted insulator surfaces may cause the ignition of electrical arcs, which in turn give rise to tracking and erosion, or may elongate until they bridge the electrodes causing flashover. Efficient models able to predict the occurrence of such a severe problem are of paramount importance…
A new steroidal alkaloid, 12-O-nicotinoylsarcostin, gagamine (1), was isolated from the roots of Cynanchum caudatum Max. (Asclepiadaceae), together with a known alkaloid, gagaminine (2). Their structures were established using spectroscopic methods, some 13C-NMR data of 2 have to be revised.
Intravenous fluids in polyvinyl chloride (PVC) packaging are known to be acidic. We proposed to determine the effect of PVC packaging on the pH of 0.9% saline solutions by comparing the predicted and measured pH of 0.9% saline equilibrated with atmospheric carbon dioxide and the measured pH of commercial solutions of…
The WO 3- x –0.1TiO 2- y thin films prepared by the sol–gel route exhibit increased lifetime and stability. A sol–gel solution mixed with nanoscopic silicon oxide particles (40 nm, 200 nm) was spin-coated onto an indium tin oxide (ITO)-covered glass substrate followed by further surface development by chemical etching…
Fatty-acid biosynthesis by a branched-chain alpha-keto acid dehydrogenase (bkd) mutant of Streptomyces avermitilis was analyzed. This mutant is unable to produce the appropriate precursors of branched-chain fatty acid (BCFA) biosynthesis, but unlike the comparable Bacillus subtilis mutant, was shown not to have an obl…
The 18-π electron ring in the phthalocyanines and porphyrins largely controls their chemical and spectroscopic properties. It is the aim of this microsymposium to explore the formation and reactivities and the spectroscopic and theoretical properties of the ring-oxidized and ring-reduced phthalocyanines and porphyrins…
Analytical expressions for the absolute change of the primary reflection intensity due to multiple diffraction are given in the kinematical approach. It is shown that satisfactory agreement between experiment and theory can be obtained for a mosaic crystal (diamond) as well as for a perfect crystal (silicon) even in t…
Photoinduced IR absorption was measured in $({\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{)}_{1\ensuremath{-}\ensuremath{\delta}}{\mathrm{O}}_{3}.$ A midinfrared peak centered at $\ensuremath{\sim}5000{\mathrm{cm}}^{\ensuremath{-}1}$ was observed in the $x=0$ antiferromagnetic sample. The peak diminish…
Abstract Metakaolins formed by total dehydroxylation of kaolinite, dickite and nacrite were hydrothermally treated at 240 ° C, for 2, 21 or 182 days, at initial pH = 5– 6 or 1. Kaolinite was the only mineral of the kaolin subgroup crystallized in these treatments. Kaolinite is less ordered for pH = 4– 6 than for pH =…
Temperature-dependent optical absorption of cerium-doped gadolinium oxyorthosilicate (Gd2SiO5:Ce) has been measured and analyzed for impurity-ion-lattice coupling parameters and oscillator strengths. Although the spectrum consists of overlapping Ce3+ bands and Gd3+ lines, two well-resolved Ce3+ bands with 10 K maxima…
[Galuskin & Galuskina (2000)][1] seem unaware of the requirements for defining and naming a new mineral species. These requirements are set out in detail by the Commission on New Minerals and Mineral Names of the International Mineralogical Association, and were adhered to exactly by [Groat et al. (
Microdisplays made from ferroelectric liquid crystals (FLCs) and silicon integrated circuits offer exceptionally high resolutions along with the capability for single-panel sequential color. The binary pixels of these microdisplays are capable of full gray scale through the use of techniques that involve illumination…
The formation and migration of vacancies in (1121) twin boundaries in α-Ti and α-Zr are studied by computer modelling. Three empirical central force potentials constructed within the embedded-atom method are used to represent atomic interactions. Minimum-energy structures for the grain boundary are found first and the…
Abstract Four “gemini”-type cholesterol-based gelators 1n were synthesized. They acted as versatile gelators of organic fluids. The xerogels show lamellar structures for 12 and 14 and fiber structures for 13 and 15 according to the even or odd number of alkyl chains between two nitrogens. The difference in these organ…