Materials Literature
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This paper reports the formation of a new series of Ho3+ -doped fluorophosphate optical glasses in the chemical formulae: 50 (NaPO3)6 + 18 BaF2 + 10 ZnF2 + 20 RF + 2 HoF3 where RF = LiF, NaF, KF, (LiF-NaF), (NaF-KF) and (KF-LiF). The physical properties, absorption and photoluminescene spectra have been measured to un…
Abstract A total of about 37 000 diffracted intensities has been measured at 20 K for a spherical single crystal of citrinin. Using a multipole formalism to interpret the X-ray data, maps of the charge density and of its Laplacian, as well as for the electrostatic potential have been derived. A value of 7(2) D has bee…
Aluminum nitride powder was synthesized from aluminum polynuclear complexes. Basic aluminum chloride (BAC) provided the aluminum polynuclear complexes. The effect of the milling treatment for the precursor made from basic aluminum chloride and glucose on the particle size was investigated. BAC and glucose were dissolv…
A continuous mixed-suspension mixed-product removal lpar;CMSMPR) crystallizer was used to study the crystallization kinetics and product purity of glutamic acid crystal in pure solution and impure solution with L-phenylanaline as the impurity. Under the assumption that the crystal growth rate was a function of crystal…
The polar regions in polycrystalline Ba(Ti1-x Snx)O3 in the temperature range 600K - Tp, where Tp is the temperature of para-ferroelectric phase transition, are independent of the content of Sn-substitution. A decrease of volume of polar regions at the increase of x leads to the rapid decrease of relative volume of fe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign, synthesis, and properties of chemical vapor deposited diamond on inorganic oxide catalysts: experimentation and simulationKhushrav E. Nariman, Jan J. Lerou, Kenneth B. Bischoff, and Henry C. FoleyCite this: Ind. Eng. Chem. Res. 1993, 32, 2, 263–273Publication Date (P…
Using infrared spectroscopy it has been shown that the mechanical load increases the rate of thermo-and γ-radiation of polyvinyl alcohol (PVA) and photooxidative degradation. The inclusion of reactive dye in the polymer inhibits these processes.
Article Crystal structure of calcium magnesium nickel tetrahydride, CaMgNiH4 was published on February 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 207, issue 2).
Abstract Bis(4,4′‐benzoyl chloride) dimethylsilane (SiCO) and 2,2‐bis(4,4′‐benzoyl chloride) propane (CCO) were synthesized and polymerized with butanediol, resorcinol, or hydroquinone. The polymers of SiCO–hydroquinone (SiCO–Hyd) and SiCO–resorcinol (SiCO–Res) possess glass transition temperatures 25°C lower than the…
Thin film ferroelectrics are technologically important materials. Doped or undoped lead zirconate titanate (PZT) and lead titanate (PT) films are of special interest since they have numerous applications in electro-optic, piezoelectric and non-volatile memory devices. In this brief overview, PZT films deposited by rf-…
The influence of heat treatments on the anodic polarization behavior of alloy 400 in acidic Na2SO4 solutions with different pH values and chloride contents has been studied. Alloy 400 is susceptible to intergranular corrosion (IGC) in 0.5 N Na2SO4 solution (pH 3) containing 0.2% CuCl2. For the same heat treatment (soa…
High‐temperature dynamic mechanical thermal analysis (DMTA) has been used to study a lithium zinc silicate glassceramic. The DMTA technique was capable of measuring the glass transition temperature of the original starting glass composition, as well as being able to follow crystallization and structural changes within…
Abstract A boundary‐element method is derived for determining the anti‐plane displacement and stress in an inhomogeneous elastic material subjected to a time‐dependent load.
The life history of freshwater populations of Rhizoclonium hieroglyphicum is fully described and illustrated for the first time, using morphological and karyological data. The cycle is diplobiontic with isomorphic gametophytes (n=24) and sporophytes (2n=48).
This study examined two polyethylene glycol (PEG) polymers (PEG 6000 and PEG 10000) and compared measurements of water potential obtained with a thermocouple osmometer and thermocouple psychrometers at three temperatures (15, 25 and 35°C) and five osmdalities (50, 100, 200, 300 and 400 g/1000 g water). These were then…
Selbst bei Konzentrationen von nur 1 Gew. ‐% lassen sich in einer Lösung von Dikaliumfolat in Wasser makromolekulare Aggregate nachweisen. Ihre wahrscheinliche Struktur ist in Einklang mit den Ergebnissen von Untersuchungen an höher konzentrierten Lösungen, die zum Teil flüssigkristallines Verhalten zeigen. In ihnen l…
Electric-field-induced cholesteric-nematic (Ch-N) phase transition and its reverse process (N-Ch) are discussed by taking account of the surface interaction effect. Threshold electric fields of a cholesteric to nematic and a nematic to cholesteric phase transition are investigated in conjunction with a liquid crystal…
The results of the observation of as-grown domain structure in lead germanate Pb5Ge3O11 (LGO) by specially deviced cleavage method are presented. The influence of periodic composition inhomogeneties (growth layers) is investigated. It is shown that the observed at room temperature frozen-in domain pattern is defined b…
A Bacillus subtilis mutant that produced glutamine synthetase (GS) with altered sensitivity to DL-methionine sulfoximine was isolated. The mutation, designated glnA33, was due to a T.A-to-C.G transition, changing valine to alanine at codon 190 within the active-site C domain. Altered regulation was observed for GS act…
Ein effizienter bifunktioneller Katalysator für die Titelreaktion ist Cobalttetra(hydrochinon)porphyrin 1 . Die oxidierte Form von 1 (rechts schematisch dargestellt. R = Hydrochinon) hat eine Einheit für die Wechselwirkung mit molekularem O 2 , eine andere für die Wechselwirkung mit dem Pd‐Katalysator. So können Elekt…