New perspectives in boron-nitrogen chemistry - I
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Identification of Some Foam-Active Compounds in Champagne Base Wines
An original method of analyzing the foam-active compounds in Champagne base wine was used, by extraction of a foam wine; after the collection of foam (by constant artificial effervescence), which collapsed into a foam wine, we analyzed the latter comparatively with the remainder wine (which remained after the extracti…
Effect of Heating an Aqueous Suspension of Chitosan on the Crystallinity and Polymorphs.
Changes in the crystallinity and polymorph of chitosan, which may affect its functionality, by heating (up to 200°C) its water suspension were studied by X-ray diffraction measurements, using tendon chitosan prepared by N-deacetylation of a crab tendon chitin, and chitosan powders with various degrees of polymerizatio…
Studies of mixed-valence states in three-dimensional halogen-bridged gold compounds, Cs2Au I Au III X6, (X = Cl, Br or I). Part 2. X-Ray photoelectron spectroscopic study
The mixed-valence states in Cs2AuIAuIIIX6(X = Cl, Br or I) were systematically studied by X-ray photoelectron spectroscopy of the Au 4f region for the first time. The gold valence states in halogeno complexes of AuI and AuIII were also studied. In Cs2Au2X6 the difference between the oxidation state of AuI and that of…
Transient simulation and analysis of a three-phase five-limb step-up transformer following an out-of-phase synchronization
Theoretical and experimental analyses are presented of the electromagnetic transient following the out-of-phase synchronization of a three-phase five-limb step-up transformer; this means an abnormal condition where the angle between phasors representing the generated voltages and those representing the power network v…
Electron transfer across vesicle bilayers
The first page of this article is displayed as the abstract.
Improved thermal conductivity in microelectronic encapsulants
Several thermally conductive ceramics in combination with different polymer matrices have been examined. The interdependence of thermal conductivity with other key properties of the polymer composites are discussed. Selection of the filler and the resultant filler content in semiconductor grade molding compound are di…
Electron imaging and diffraction study of individual crystals of bone, mineralized tendon and synthetic carbonate apatite
A transmission electron microscope study of carbonate apatite crystals isolated from bone and mineralizing tendon, as well as those produced synthetically under approximated-physiological conditions, shows that they are thin irregular shaped plates. Electron diffraction patterns of individual crystals confirm that the…
Trivalent boron as acceptor chromophore in asymmetrically substituted 4,4′-biphenyl and azobenzene for non-linear optics
[4′-(Dimethylamino)biphenyl-4-yl]dimesitylborane (BNB) and [4′-(dimethylamino)phenylazophenyl-4-yl]dimesitylborane (BNA) have been prepared and studied by a solvatochromic technique. The high second-order hyperpolarisability coefficients βCT determined by this technique, 37 and 240 × 10–30 esu, respectively, show that…
Graft copolymer compatibilizers for blends of polypropylene and ethylene-propylene copolymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGraft copolymer compatibilizers for blends of polypropylene and ethylene-propylene copolymersDavid J. Lohse, Sudhin Datta, and Edward N. KresgeCite this: Macromolecules 1991, 24, 2, 561–566Publication Date (Print):January 1, 1991Publication History Published online1 May 2002…
VPI-7: the first zincosilicate molecular sieve containing three-membered T-atom rings
VPI-7: the first microporous zincosilicate to contain 3-membered rings (3MR) is reported.
Infrared spectroscopic studies of the reactions of alcohols over group IVB metal oxide catalysts. Part 2.—Methanol over TiO 2 , ZrO 2 and HfO 2
Infrared spectroscopy has been used to analyse the gas-phase reaction products, and the related adsorbed species, obtained from the decomposition of methanol over TiO2, ZrO2 or HfO2 catalysts after consecutive 10 min heating periods at 50 °C intervals between room temperature and 400 °C. Somewhat different results wer…
Carbon black filled natural rubber. 1. Structural investigations
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon black filled natural rubber. 1. Structural investigationsJ. C. Kenny, V. J. McBrierty, Z. Rigbi, and D. C. DouglassCite this: Macromolecules 1991, 24, 2, 436–443Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 J…
Colloidal carriers for controlled drug delivery and targeting : modification, characterization, and in vivo distribution
INTRODUCTION. THE CONCEPT OF CONTROLLED DRUG DELIVERY AND DRUG TARGETING. INTERACTION OF I.V. ADMINISTERED CARRIERS WITH BLOOD COMPONENTS AND THE RETICULOENDOTHELIAL SYSTEM. IN VIVO FATE OF I.V. ADMINISTERED DRUG CARRIERS. BIODEGRADABLE CARRIERS FOR DRUG DELIVERY. LOCALIZATION OF CARRIERS IN THE TARGET TISSUE. TARGETI…
Catalytic activity of supported heteropoly acids for reactions requiring strong acid centres
The effect of supports such as silica, alumina, amorphous aluminosilicate and magnesia on the activity of heteropoly acids (HPA) for reactions requiring strong and very strong acid sites has been studied. It has been found that 12-tungstophosphoric acid (HPW) mounted on alumina and silica catalyses cumene cracking at…
Compounding of Thermoplastic Starch with Twin‐screw Extruders
Abstract The compounding of thermoplastic starch can be regarded as a combined process consisting of extrusion cooking and plastic compounding. The quality of the product is determined largely by the degree of mechanical shear, temperature and water content. These parameters can be influenced both by the machine syste…
Oxide Growth Mechanism on Zirconium Alloys
In order to get a better understanding of the mechanisms governing corrosion of Zr-based alloys, several examinations have been performed on a variety of samples with uniform and nodular corrosion and different oxide layer thicknesses. The results point to a barrier layer concept. The oxide layer becomes porous at a c…
Ultrasonic degradation of polymer solutions. 1. Polystyrene revisited
Abstract The results of ultrasonic irradiation of polystyrene solutions in toluene, benzene and carbon tetrachloride are described. The effect of a range of conditions such as ultrasonic intensity, solution concentration and varying solvents were investigated. The non‐random nature of the degradation process was clear…
Highly conjugated π-electron donors for organic metals: synthesis and redox chemistry of new 1,3-dithiole and 1,3-selenathiole derivatives
The bis(1,3-dithiolium) dication salts 8a–c have been synthesised in three steps (31–51% overall yields) starting from 1,4-bis(bromomethyl)naphthalene, 9,10-bis(chloromethyl)anthracene and 4,4′-bis(chloromethyl)biphenyl, respectively. The bis(halogenomethyl) compounds 5 were converted into the dipiperidiniumbis(dithio…
Energy Deposition in Small Cylindrical Targets by Monoenergetic Electrons
Calculations of energy deposition in cylindrical target volumes of diameter and height 1-100 nm, including those similar to the dimensions of biological molecules and structures such as DNA, nucleosomes and chromatin fibre, have been made. The calculations used the Monte Carlo track structure program MOCA8B for electr…