Materials Literature
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Abstract Phthalic anhydride and maleic anhydride could be completely oxidised to CO2 and H2O over Co-Mg-O/Al2O3 and V-Mg-O/TiO2 catalysts. Experimental results showed that the cobalt and vanadium oxide catalysts promoted with MgO had superior combustion activity than the unpromoted catalysts.
Abstract We show that the damping of longitudinal mechanical oscillations in soft magnetic amorphous ribbons can be significantly reduced by domain refinement. The latter is realized by an out-of-plane anisotropy induced by magnetic field annealing. The phenomena is interpreted in terms of micro eddy currents associat…
Hungarian red clays are the result of soil formation from previous geologic periods. They were spread over areas which were dry during the Tertiary Period and were not covered by sediments. The climate of the Quaternary Period eroded them, so that today they can only be found in areas where they were protected against…
Abstract In this paper, production of precipitated calcium carbonate (PCC) with required particle size and morphological structure, along with its dependence on technological parameters and the properties of Ca(OH) 2 , is discussed. The effect of the reaction environment on the kinetics of CaO hydration and the format…
This paper reports a refined model to predict the tensile behavior of rotor spun yarn from the knowledge of specimen specifications and yarn strain. Fundamental approaches used in modeling include a discrete fiber-modeling principle, an energy method, and a "shortest-path" hypothesis. The study is based on a coaxial-h…
Abstract The U.S. Environmental Protection Agency (EPA) has issued a proposed rule for control of hazardous air pollutants from cellulose manufacturing operations. Both the hydrogen sulfide and carbon disulfide emissions must be controlled. An activated carbon‐based process has been developed which effectively removes…
Abstract Numerous cyclic dibutyltin alkoxides were prepared by condensation of Bu 2 Sn(OMe) 2 with various short or long α,ω‐diols. Insertion of lactones or lactide into the SnO bonds resulted in ring‐expansion polymerizations which allowed a control of the ring size (chain length) via the monomer initiator ratio. Wh…
Equations are presented that model diffusion of a protein to the surface of a growing crystal in a convection-free environment. The equations apply to crystal growth solutions that contain both a protein and a protein precipitant. The solutions are assumed ternary and the equations include all four diffusion coefficie…
Abstract The influence of ion implantation on the surface properties of polyimide was studied. We investigated microhardness, friction, wear and wettablility of polyimide. Energies of 50 keV and 200 keV were used, with doses ranging from 1 × 10 13 to 1 × 10 16 ion cm −2 . The implanted ion species were B, N and Ar. Th…
A nonlinear geometric feedback controller with and without state estimation (the extended continuous-discrete Kalman filter) is developed and applied to a 0.027 m 3 potash alum batch crystallizer. The manipulated variable isthetemperature of the inlet cooling water supplied to the jacket of the crystallizer, and the c…
Des quartz naturels de différentes provenances ont été étudiés par RPE après irradiation par un rayonnement β , dans le but de caractériser les centres paramagnétiques dus à certaines impuretés et d'examiner dans quelle mesure leur proportion relative peut constituer un critère discriminant. L'étude RPE de quartz orig…
Abstract Six series of the processed polypropylene (pp) samples containing 0.25–1 wt% photo‐initiators (PIs, four aromatic carbonyl, two ferric compounds) and also a series of 6 wt% corn‐starch‐filled pp containing 0.5 wt% of each PI, were prepared using a mixer in a closed system at 180 °C for 5 min. The melt flow in…
The influence of hydrogen on the mechanical properties of four austenitic CrNiMo and CrMn alloys with nitrogen contents up to 0.57 wt-% were investigated concerning their resistance against hydrogen embrittlement in correlation to nitrogen content, chemical composition, and hydrogen diffusivity and solubility. Tensile…
A review of several aspects of the interaction of bubbles with acoustic and flow fields is presented. The focus of the paper is on bubbles in hot liquids, in which the bubble contains mostly vapor, with little or no permanent gas. The topics covered include the effect of translation on condensation in a subcooled liqu…
The plastic deformation behaviour of two different batches (having differences in chemical composition) of 316L austenitic stainless steel has been explored in the 200-800°C temperature range as a function of grain size. The plastic behaviour is correlated with microstructural observations of annealed and deformed sam…
On the basis of the changes of physical properties such as refractive index, dynamic viscosity, pH value (Table 1) and spectrum analysis (IR, l H NMR and 1 3 C NMR - Figs. 1-5) a probable reaction course (scheme A) and chemical structures of the products formed in the system consisting from urea (here: M), phenylsulfo…
Abstract Biodegradable epoxy‐polyester resins were synthesized in two steps: (1) synthesis of the polyesters with allyl pendent groups; (2) epoxidation of allyl groups in the polyesters. Polyesters with allyl pendent groups were synthesized by melt copolymerization of succinic anhydride (SA) and allyl glycidyl ether (…
Egyptian calcium hydroxide byproduct, produced as a waste material during preparation of acetylene gas, causes various ecological problems. The present work had the aim of utilising this waste material as a source of calcium oxide in the production of refractory calcium aluminate cement. Two types of calcium aluminate…
Abstract The ion pairs {[Ni(cyclam)]2+[M(mnt)2]2−} (M = Co, Ni: 1a,b), {[Ni(tmc)]2+[M(mnt)2]2−} (M = Co, Ni: 2a,b) and the solvent complexes {[Ni(cyclam)(dmso)2]2+[M(mnt)2]2−} (M = Co, Ni, mnt2− = maleonitriledithiolato = (Z)1,2-dicyano-1,2-ethylenedithiolato, cyclam = 1,4,8,11-tetraazacyclotetradecane, tmc = 1,4,8,11…
Optical second harmonic generation (SHG) measurements have been carried out on the B2 phases of three liquid crystal materials composed of conventional banana-shaped molecules (P-10-O-PIMB, P-8-O-PIMB and P-8-PIMB). Quantitative values of the second order susceptibilities dij have been deduced from SHG measurements at…