Materials Literature
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The synthesis and characterisation of several hepta-substituted triphenylene derivatives are reported. These unsymmetrically substituted triphenylene derivatives are of three varieties, i) with seven identical peripheral alkoxy chains, ii) two or three out of the seven alkoxy chains have different chain lengths and, i…
composites were prepared using sol‐gel‐derived aerogels and xerogels. The addition of aerogel or xerogel to AgI enhanced the ionic conductivity. The conductivity at room temperature showed a maximum at the composition in both aerogel‐containing and xerogel‐containing composites and was for the aerogel composite. The c…
The yields of the different radiolytic products formed by gamma radiolysis from NaCl brines at ambient temperature and dose rates between 0.1 and 1 kGy/h were determined. At a chloride concentration of 5.3 mol/l, H2, O2, and ClO3- were formed proportional to the dose and independent from the dose rate with G values of…
Obertiite is a new amphibole species from Bellerberg, Laccher See district, Eifel, Germany. It occurs with tridymite, fluororichterite, hematite, rutile, aegirine-augite, kinoshitalite, and fluor-apatite in vugs in volcanic rocks, and crystallized from late-stage hydrothermal fluids associated with recent volcanism. O…
A large portion of the stator core of a rotating electric machine is subjected to magnetic flux that rotates in the plane of the laminations. Iron losses under rotating flux conditions can differ considerably from those due to alternating fields. It has long been suspected that this difference may be responsible for s…
The results of the evaluation of zinc maleate and zinc anthranilate as thermal stabilizers for poly(vinyl chloride) (PVC) are reported in this article. Calcium stearate, diphenyl isodecyl phosphite, and epoxidized soya oil were used as costabilizers. Both zinc compounds showed good stabilizing performance in static an…
A sonochemical approach to the preparation of elongated needles of Pb(OH)Br using a cationic surfactant, cetyltrimethylammonium bromide (CTAB) is reported. A shape transition of the particles is found to occur due to the presence of an organized medium consisting of a cylindrical, interconnected network of thread-like…
Mechanical properties of foams extruded with starch and biodegradable polymers were correlated withingredient formulations and physical characteristics of the extrudates. The type of polymer had a significant effect onfoam compressibility and Youngs modulus. The PLA-starch and EBC-starch foams were softer than the Mat…
We report on the magnetic and magnetocaloric properties of GdFeSi, as obtained from DC magnetisation and specific heat measurements, in applied fields up to 9 Tesla and in a temperature range between 3 and 300 K. The compound orders ferromagnetically at 118 K. In the paramagnetic range it follows the Curie–Weiss law w…
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The catalytic reaction of Co(CO)3NO and Mg at 900 °C has led to the formation of multi-walled carbon nanoflasks.
Nucleation and growth process of sticking particle in ferritic stainless steels was investigated using a two-disk type hot rolling simulator. The sticking behavior was strongly dependent on the surface roughness of a high speed steel roll (HSS) and the oxidation resistance of the ferritic stainless steels. A sticking…
The paper presents a broad discussion on the problem of mechanical destruction of intumescent chars in the application to fire protection of buildings in conditions of fires and protection of rocket engines in conditions of intensive mass and heat flows. Data on mechanical strength of various types of chars in hot and…
The influences of the molecular weight and chlorine content of chlorinated polyethylene (CPE) on the dynamic mechanical propertiesof an organic hybrid consisting of CPE and 3,9-bis[1,1-dimethyl-2{β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5,5]-undecane (AO-80) were investigated…
Ralstonia eutropha was cultivated under oxidative conditions in the presence of hydrogen peroxide and methyl viologen to stimulate the flux of NADPH to the PHA biosynthesis pathway. The effects of oxidants on the biosynthesis of poly-beta-hydroxybutyrate(PHB) and poly(3-hydroxybutyrate-3-hydroxyvalerate)[P(3HB-3HV)] w…
A novel method to explicitly compute orthonormal symmetrized harmonics is presented and the method is applied to the identity representation of the icosahedral group. Spherical viruses have icosahedral symmetry and the motivating application is the parametric representation of spherical viruses for use in inverse prob…
The structure and temperature dependence of complex lead perovskite dielectrics were investigated for the system (1 − x )Pb(Yb 1/2 Ta 1/2 )O 3 – x Pb(Lu 1/2 Nb 1/2 )O 3 . Superlattice reflections for the compositions 0.8 < x < 1.0 were observed by X‐ray diffractometry, and the temperature‐composition dielectric‐…
Most materials in their nanocrystalline state exhibit unusual properties. The tremendous enhancement of mechanical, physical, and chemical properties caused by the fine admixture of order (inside the crystallites) and disorder (in the grain boundary regions) is being exploited in a number of frontier technologies. A c…
The development of crystallographic texture during directional solidification has been analysed quantitatively in columnar castings of the Ni-base superalloys, CMSX4 and CM186LC, produced with a range of cooling rates. The area density of grains having axiaI orientations within a specified scatter from <OOl> and the i…
(1) Poly-titanosilazanes were synthesized by chemical modification with Ti(X)4 [X=N(CH3)2, OCH(CH3)2]. The chemical structure of the synthesized precursors was studied using IR and 1H NMR techniques. The polytitanosilazanes were found to contain some N-Ti bonds.(2) [Si-Ti-O-C-N] multicomponent amorphous powders were s…