Materials Literature
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A discussion of crystal field theory is usually included in general chemistry texts. This is likely to be one of only two places in the text - the other is the description of the hydrogen atom - where the important concept of light absorption by atoms and molecules is presented. The simple demonstration described here…
The Ferroelectric domain patterns and the {111} twin boundaries are frequently observed in the BaTiO3 ceramics. The ferroelectric domain structures in BaTiO3 single crystal were investigated by a conventional and a synchrotron white beam X-ray topographies. The domain structure of {111} twinned crystal sample was also…
Abstract [Cr(H 2 O) 2 Pc 2− ]I x reagiert in Dimethylformamid mit überschüssigem (PNP)NO 2 zu wenig löslichem, grünschwarzem l ‐Bis(triphenylphosphin)iminium‐ trans ‐di(nitrito( O ))phthalocyaninato(2–)chromat(III), l (PNP) trans [Cr( O NO) 2 Pc 2− ], welches triklin in der Raumgruppe P 1 (Nr. 2) mit Z = 2 kristallisi…
The dissolution of alumina in cryolite melts was studied in a laboratory apparatus intended to simulate the conditions in industrial cells with point feeding. Rapid dissolution is achieved if (1) a large proportion of the batch of alumina added is dispersed in the bath upon addition, and (2) the agglomerates which for…
Abstract Grey cast iron (3.4%C–2.7%Si–0.4%Mn–0.5% P–0.008%S) with different morphology of graphite and different amount of ferrite, pearlite and eutectic phases has been subjected to corrosion and electrochemical tests in phosphoric acid solution, simulating the oxidized engine oil. The difference in the cathodic proc…
Abstract The effect of some DDT‐preventing agents (DPAs) and their mixtures on the impact sensitivity of RDX/PU has been studied. All specimen for drop‐hammer test were prepared by solvent‐slurry method. Two ways were used in adding DPA. The behavior of moulding powders obtained to the mechanical impact were assessed…
Abstract The intermediate part of the cation substitution series (Ca 1− x Sr x ) 8 [Al 12 O 24 ](WO 4 ) 2 of the aluminate sodalites Ca 8 [Al 12 O 24 ](WO 4 ) 2 and Sr 8 [Al 12 O 24 ](WO 4 ) 2 has been studied as a function of temperature and composition, with emphasis on the range 0.50 ≤ x ≤ 0.60. A composition-induc…
Pure urania- and urania-gadolinia-containing fuel pellets were coated with boron nitride (BN) to improve the physical and neutronic properties of the fuel. The BN coating seems to have a technological advantage over zirconium-diboride coating. The BN is chemically inert, corrosion resistant, withstands rapid temperatu…
The clay fraction of sediments drilled at Sites 903 and 905 is composed of variable proportions of chlorite, illite, random mixed layers (including illite-smectite and illite-vermiculite), smectite, and kaolinite. The coincidence of major changes in clay mineralogy with increasing values of oxygen isotopes suggests a…
Abstract The crystal structure of carminite, PbFe 2 (AsO 4 ) 2 (OH) 2 has been refined. The mineral is orthorhombic, Cccm with a = 16.591(2), b = 7.580(1), c = 12.285(1) Å, Z = 8; the structure has been refined to a conventional R = 3.3% using 913 observed reflections [I>2σ(I)]. The structure contains stepped chain…
AG337 (Thymitaq) is an antitumor compound synthesized by Agouron Pharmaceuticals, Inc., using protein structure-based drug design. AG337 is a hydrochloride salt with a molecular formula of C14H12N4OS.2HCl. This compound was subjected to thermal analyses, Karl Fischer titrimetry, powder X-ray diffractometry, scanning e…
Abstract Novel copolymers consisting of 3,3,3‐trifluoro‐1,2‐epoxypropane (TFEP) and N ‐phenylmaleimide (PMI) units were prepared by the copolymerization of TFEP with PMI initiated with an organozinc compound. Using [Zn(OCH 3 ) 2 · (C 2 H 5 ZnOCH 3 ) 4 ] as an initiator, the copolymer chains consisted mainly of TFEP‐TF…
We treat the generation of flat-top intensity distributions, as required for laser applications at short wavelengths. To obtain high fill factors and almost arbitrary shapes, arrays of diffractive Fresnel zone plates at the fabrication limit are investigated. The angular power spectrum noise due to the binarization of…
<div class="htmlview paragraph">Ever stringent emission legislation has called for more advanced measures for petrol engine emission control. The main chanllenge is to largely cut off the engine cold-start emissions. The problem is that the catalytic converter does not operate effectively at temperature below th…
We apply a recursive propagation method to the modal theory of diffraction by laminar amplitude multilayer gratings (LAMG’s). We compute the reflection efficiency in the X-UV domain of several LAMG’s and show the numerical stability of this method with respect to a nonrecursive one.
A high temperature-high pressure pyrophyllite cell with a graphite heater has limitations when temperature exceeds ∼2100 K. A conventional cell used with the cubic anvil high pressure apparatus has been modified to reach ∼3300 K. The heater power versus temperature calibration curve has been established using Pt–Pt10%…
<div class="htmlview paragraph">This paper describes experiments conducted to determine Federal Test Procedure (FTP) exhaust emissions, ozone-forming potentials, specific reactivities, and reactivity adjustment factors for several butane/propane alternative fuel blends run on a light-duty EHC-equipped gasoline v…
The dielectric properties of glycerol, propylene glycol, ethylene glycol and dimethyl sulphoxide have been measured in various aqueous concentrations generally sufficient to allow supercooling rather than freezing. The temperature range investigated is from -80 degrees C to +20 degrees C and the frequency range is 100…
Abstract— The study of phosphor materials generally focuses on systems with a high quantum efficiency. On the other hand, a thorough understanding why certain systems show very low quantum yield will certainly, lead to a better understanding of phosphor materials in general. Here we present studies on cerium‐doped lut…
Experiments were performed to study the permeation of hydrogen isotopes through a membrane of palladium-silver alloy in the temperature range of 353 to 673 K using the co-current double tube method. It is observed that permeation is limited by the diffusion process of hydrogen atoms in the bulk of membrane in the larg…