Materials Literature
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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…
This paper describes the microbial production of polyhydroxyalkanoates (PHAs) from food industry wastes by a mixed culture of activated sludge microorganisms. The physical and chemical properties of the bioplastics produced by the microorganisms from malt and soy wastes were different. The melting points of the produc…
A monitoring instrument with novel porous silicon humidity sensors is presented. The sensors feature a humidity-sensitive capacitor with a porous silicon dielectric, as well as two on-chip integrated thermoresistors and a refresh resistor. The capacitance variation upon water uptake is here modelled with an effective…
Abstract Polypropylene containing comminuted fiber reinforced thermoset recyclate has been shown to exhibit enhanced mechanical properties relative to particulate‐filled materials. Optimum mechanical performance in these recyclate‐filled materials is achieved in compositions made from rubber‐modified polypropylene con…
PETI-5 (5000 g mol −1) is a relatively new adhesive and composite matrix that exhibits good processability and excellent properties. However in the fabrication of complex composite parts (i.e. skin stringer and support frames), better processability would offer distinct advantages. In an effort to improve the processa…
Waterborne polyurethane dispersions (PUDs) continue to show growth in commercial usage due to the ever increasing environmental legislation to reduce VOC in coating and adhesive materials. The transition from solvent‐based to waterborne has also been facilitated by advances in both the chemistry and technology employe…
The hydratase-aldolase-catalyzed conversion of trans-o-hydroxybenzylidenepyruvate to salicylaldehyde and pyruvate is an intermediate reaction in the conversion of naphthalene to salicylate by bacteria. Here, a variety of aromatic aldehydes and some nonaromatic aldehydes together with pyruvate have been shown to be sub…
A full scale three-phase multi-stress accelerated electrical aging test facility for stator bars is described. Electrical aging characteristics may be determined under simultaneous electrical, mechanical and electrical stress at either 60 Hz or an accelerated frequency of 400 Hz. Typical initial aging data are present…
The phase evolution of lead titanate processed by the polymeric precursor method was investigated by thermal analysis, X‐ray diffraction, and high‐resolution transmission electron microscopy. The results showed that the cubic perovskite PbTiO 3 (PT) phase is formed from an inorganic amorphous precursor at a temperatur…