Materials Literature
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N-Phenylmaleimide–styrene copolymers (PMS) and reactive N-phenylmaleimide–styrene–p-hydroxystyrene (HSt) terpolymers (PMSH) containing p-hydroxyphenyl groups were used to improve the toughness of bisphenol A diglycidyl ether epoxy resin cured with methyl hexahydrophthalic anhydride. PMS and PMSH were effective modifie…
In order to elucidate the nature and the structure of the elusive (OC)2Rh(Ph3SiO)2Rh(cod) (cod) = cycloocta-1,5-diene) complex, an important model compound for surface catalysis, (OC)2RhCl2Rh(cod) has been synthesized, and structurally characterized by ab initio X-ray powder diffraction. Crystals of (OC)2RhCl2Rh(cod)…
Twenty cardenolide glycosides were obtained from the leaves, wood and twigs of Thevetia ahouai (LINN.) A.DC., Apocynaceae. Among these, four compounds were determined to be new combinations of known aglycones and sugars, based on spectral and chemical evidence, and nine compounds were C-nor-D-homo cardenolide glycosid…
The chemical reaction mechanism and fine particle generation during atmospheric pressure chemical vapor deposition with the tetraethylorthosilicate/ozone system were studied experimentally and theoretically for a flow-type vertical-tube reactor. For the thermal decomposition of ozone, numerical simulations obtained us…
Ca. 2 and >5 molecules of hydrated water are removed from the inner sphere of Eu III on strongly and weakly acidic ion-exchange resins, respectively, showing the different mechanisms between ion-exchange reactions occurring on these two types of resins.
Summary This paper describes an investigation of the effects of tungsten on the precipitation behaviour of intermetallic compounds in the HAZ of duplex stainless steel and the mechanism of these effects to clarify the advantage of having some Mo replaced by W. Fine precipitates of sigma phase are observed in electron…
A method of radioactive waste concentration by membrane distillation is presented. Water flow through a hydrophobic membrane results from the temperature gradient between membrane surfaces which are in contact with two waste streams, warm and cold. A transport of water from the warm to the cold stream occurs and radio…
A correlation between the direction of the tetrad (double-double) effect in the lanthanide and actinide series and coordination number (CN) is discussed on experimental and theoretical grounds. Some examples of determining the CN values of the f-block elements in solution complexes using the tetrad effect are reviewed…
Spectra and lifetime measurements of the strongly mixed B″ 3 Π u and B 3 Σ u − states of 32 S 2 are presented covering v′ = 710 of the B state and v′ = 1221 of the B″ state. This extends our earlier work (M. E. Green and C. M. Western, J. Chem. Phys., 1996, 104, 848) to just above the first dissociation limit ( 3 P +…
Knitted fabric composites have certain advantages over woven composites, particularly in their ability to conform to complicated contours. As a consequence, however, they demonstrate inferior mechanical characteristics compared to woven materials as a direct result of the presence of bent fibers. Such a knitted fabric…
A colloidal route has been used to make zirconia tubes that were found to have excellent mechanical properties with strengths >500 MPa, surviving rapid heating conditions of 200°C/min to operating temperatures of 800°C. These tubes were put into a 200 tube solid oxide fuel cell(SOFC) reactor. The reactor was computer…
The accuracy of a stylus probe method in measuring localized magnetic properties of grain-oriented silicon steel sheet was investigated and its application was studied. The measuring error for the localized flux density was determined to be less than 1.7% for the load onto the stylus tip lighter than 300g when the yok…
It seems that there is a confusion of the critical exponent of conductivity of composites which is caused by the way of determining the percolation threshold. In this paper, the percolation behavior, the critical exponent of conductivity and the electrical conduction mechanism of carbon black-polyethylene composites a…
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We introduce a method for finding weak structural similarities in a set of protein structures. Proteins are considered at their secondary structure level. The method uses a rigorous graph-theoretical algorithm which finds all structural similarities. Protein structures are modelled as undirected labelled graphs, the s…
Cadmium coatings have in the past been frequently used as protective coatings against corrosion of metallic structures, but cadmium is now known to be a polluting substance, dangerous for human health and the environment. Since 1991, a European directive has regulated the use of cadmium coatings in industry. Other coa…
Pyrazine-2,3-dicarbonitriles may be used as precursors for aza analogs of phthalocyanines (AzaPc's).Presently AzaPc's are receiving considerable attention, mainly due to their increased solubility compared to the parent phthalocyanines.Enhanced solubility is caused by the eight additional nitrogens in the macrocycle a…
In this paper, a small-angle neutron scattering study of gammaII-crystallins near their isoelectric point is presented. The experiments were carried out using protein concentrations of 5.7-85.7 mg/ml at temperatures in the range 11 -60 degrees C. The experimental data were analyzed using an ellipsoidal model for intra…
The 15-tert-butyl-5-oxophlorin 1 forms a stable, neutral π-radical species 2, in high yield; the 13,17-bis-unsubstituted 5-oxophlorin analogue 5, under similar conditions, affords the 15-iso-5-oxophlorin 6 and 15-hydroxy compound 7 (both characterized by X-ray crystallography), the latter demonstrating the trapping of…
TEMPO (2,2,6,6-tetramethylpiperidinyloxy) radical 1 and its derivatives 2–5 are found to form charge-transfer complexes with some acceptors such as TCNQF 4 (2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane) or DDQ (2,3-dichloro-5,6-dicyano-1,4-benzoquinone) being isolated as solid substances.