Materials Literature
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ABSTRACT The extent of oxidative and storage stability of margarine samples were determined by measuring peroxide values (PV) and Accelerated Shelf‐Life Testing (ASLT). Two margarine samples, A and B, which were packaged with parchment and Acrylonitrile butadiene styrene (ABS), respectively, were studied to predict th…
Electron paramagnetic resonance (EPR) of Mn2+, Ni2+, and Cu2+ in magnesium fluosilicate hexahydrate (MgSiF6.6H2O) crystals has been studied at X- and Q-band frequency in the temperature interval 77 ÷ 400 K. At cooling of crystals with natural abundance of 3dn-ions, at T i1 = 370 ∓ 0.5 K, T i2 = 344 ∓ 0.5 K, T c = 296…
Electrical studies of quaternary solid solutions Pb1-xSnxTe1-ySey in a wide composition range revealed the phase transition, occurred at unexpectedly low x (x > 0.08). It is shown that this phase transition may be associated with Sn off-center ions. The unusual enhancement of T c, induced by substitutional disorder, w…
The dissolution behavior of Cu metal in hydrogen peroxide (H2O2)-ethylenediaminetetraacetic acid (EDTA) solution was studied through both electrochemical and chemical tests. In the electrochemical experiments, the open circuit potential (OCP) of Cu electrode at low H2O2concentration below 0.5wt% was determined by Cu a…
A general method for the preparation of amide-containing aromatic polyether ketones has been developed. Polymerization is based on a ketone-activated halo displacement in amide-containing bis(4-fluorobenzoyl) moieties by phenoxides. N,N-Bis[4-(4-fluorobenzoyl)-(4-phenoxyphenylJ]terephthalamide and 4-[(4-fiuorobenzoyl)…
Conditioning behavior of surface flashover strength of a large-bandgap insulator (quartz) is investigated with the aid of streak photography in conjunction with electrical (voltage and current) and optical UV (phototube) diagnostics. The breakdown strength of the sample is found to be conditioned during the initial te…
Article Crystal structure of tetrapotassium hexaselenodistannate, K4Sn2Se6 was published on June 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 203, issue 1-2).
Several technologies have been reported for the synthesis of AlN. These are reviewed and described in detail. The processes are classified according to the principle of synthesis, and the AlN product characteristics for each method of synthesis are identified. Only two of the methods reported, direct nitridation and c…
The study of poorly crystallized compounds by X-ray powder diffraction is sometimes very difficult because structural information is not easily obtained. One way to determine these structural data is to test more or less complex crystallographic models and compare simulated wide-angle X-ray scattering (WAXS) and small…
The phase diagram for the ternary system MgO─P 2 O 5 ─H 2 O at 25°C has been constructed. The magnesium phosphates represented are Mg(H 2 PO 4 ) 2 · n H 2 O ( n = 4, 2, 0), MgHPO 4 ·3H 2 O, and Mg 3 (PO 4 ) 2 · m H 2 O ( m = 8, 22). Because of the large differences in the solubilities of these compounds, the technique…
Ellipsometric spectra of polyaniline which is one kind of new conducting polymers are measured. The complex dielectric function, the index of refraction and the absorption coefficient of insulating polyaniline as the functions of photon energy are obtained. The absorption spectra obtained by us and other authors are c…
Specimens of an aromatic polyamide (Aramid) paper, which were subjected to various degrees of moisture adsorption as well as water immersion, were investigated in order to estimate how much the adsorbed moisture and the stored water affect the dielectric and thermoanalytical behavior. In the humid specimens the dielec…
Due to its high crystallinity and purity, hydrothermal powder was used to study the effects of grain size and density on the dielectric properties of BaTiO3. Curie-Weiss analysis was used to analyze the results as porosity increased. A correlation was found between the level of porosity and the difference between the…
The NOx composition and iodine species in the dissolution of spent fuels are discussed on the basis of thermochemical calculations and experimental results. The influence of N0x sparging on the expulsion of iodine is also discussed. The dissolution of a spent PWR-fuel specimen (–3g) in 30 ml of 3.5MHNO3 at 100°C is ca…
Abstract Several tricyclo[5.3.1.01,5]undec-9-ene-8,11-diones have been synthesized in stereospecific manner, by using electrochemical oxidation of the corresponding phenols with trans or cis para-halo substituted styryl group. Two of the products were subjected to base-catalyzed fragmentation reaction to afford two di…
Discharges in model capacitors made of polypropylene impregnated with an organic liquid are studied with a digital analyzer. The effect of the nature of the liquid (aliphatic or aromatic hydrocarbon) and the influence of parameters such as voltage, pressure and temperature on the main characteristics of the discharges…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural investigations of urea-aliphatic polyester adductsAbdellatif Chenite and Francois BrisseCite this: Macromolecules 1993, 26, 12, 3055–3061Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993https://pubs.ac…
A new chiral organic acid, 2(S)-[2(S)-methylbutoxy]propionic acid (2), was synthesized from ethyl lactate and (S)-1-iodo-2-methylbutane. The acid 2 containing two centres of chirality was used as a building block for preparing ferroelectric liquid crystals. Three series of chiral compounds were synthesized to study th…
Abstract Na-poor, Fe-bearing high sanidine from a lamproite near Cancarix (Spain) has 2Vα‖(010) = 37-43° and C2/m, a = 8.598(15), b = 13.050(26), c = 7.209(17) Å, β = 116.00(18)° V = 727(2) Å 3 . Rims of sanidine crystals against vugs contain up to 60 mole % KFeSi 3 O 8 and up to 10 at.% Si and 6 at.% K above the stoi…
We have grown high quality La0.5Sr0.5CoO3 thin films by Pulsed Laser Deposition. This material is a electrically conducting perovskite which can be used as structurally compatible electrodes for devices using ferroelectric materials such as Pb-La-Zr-Ti-O (PLZT). Oxygen stability was investigated under various annealin…