Претраживање
Приказ резултата 21-30 од 42
The study of iron chlorination from bauxite for its enrichment
(Munksgaard Int Publ Ltd, Copenhagen, 2001)
The possibility of enriching bauxite by removing iron in low-temperature chlorination by gaseous chlorine in the presence of carbon as a reducer from coke and carbon monoxide, is investigated. Thermodynamic analysis points ...
Design of ion-exchange resins selective of caesium. Synergistic effect of macrocycle in phenolic resins
(Marcel Dekker Inc, New York, 2001)
The extraction of caesium by resorcinol based resins was investigated. At high hydroxide concentration ([OH-] = 0.15 M), the alkali-metal cations' sorption selectivity (determined in competitive extraction system) for ...
Fractal approach to ac impedance spectroscopy studies of ceramic materials
(Kluwer Academic Publ, Dordrecht, 2001)
A novel fractal model for grain boundary regions of ceramic materials was developed. The model considers laterally inhomogeneous distribution of charge carriers in the vicinity of grain boundaries as the main cause of the ...
Structural characteristics of bright copper surfaces
(Journal of Electroanalytical Chemistry, 2001)
In this work, the structures of copper surfaces polished mechanically and polished both mechanically and electrochemically, as well as copper coatings obtained in the presence of basic and top brightening addition agents ...
Computational studies in the AlPO4-34 system
(Kluwer Academic Publ, Dordrecht, 2001)
The lattice energies of the as-synthesized fluoride-containing chabazite-like aluminophosphate (AlPO4-34F) and of the corresponding metal-substituted materials [MeAPO-34F, Me = Mn(II), Co(II), Ni(II)] have been calculated ...
Synthesis and characterization of thermoplastic poly(ester-siloxane)s
(Wiley-Blackwell, 2001)
Two series of thermoplastic poly (ester-siloxane)s, based on poly(dimethylsiloxane) (PDMS) as the soft segment and poly(butylene terephthalate) as the hard segment, were synthesized by two-step catalyzed transesterification ...
On the thermal decompositions of the trivalent trioxalato complexes of Al, Cr, Mn, Fe and Co
(Springer, Dordrecht, 2001)
The thermal decompositions of the complexes K-3[M(ox)(3)]. 3H(2)O (M=Al, Cr, Mn, Fe, Co; ox=C2O42-) were studied. Dehydration of the complexes occurs up to 200 degreesC, this being a three-step process for M=Al, Cr, Mn and ...
Immobilization of invertase on a new type of macroporous glycidyl methacrylate
(Kluwer Academic Publ, Dordrecht, 2001)
Invertase was immobilized via its carbohydrate moiety. The immobilized enzyme has a specific activity of 5500 IU g(-1), with 45% activity yield on immobilization. In a packed bed reactor, 90% 2.5 M sucrose was converted ...
Influence of synthesis parameters on the particle sizes of nanostructured calcium-hydroxyapatite
(13th international Symposium on Ceramics in Medicine (BIOCERAMICS), 2001)
In this paper the synthesis of biocompatible calcium-hydroxyapatite particles, chemically and morphologically similar to the mineral particles in human bones, is presented. The influence of synthesis parameters: temperature, ...
A study of HAp/PLLA composite as a substitute for bone powder, using FT-IR spectroscopy
(Elsevier Science Ltd, 2001)
Chemically synthesized hydroxyapatite/poly-L-lactide (HAp/PLLA) composite biomaterial was studied in vivo. The biocomposite was implanted into Balb/c Singen mice and after 1 and 3 weeks removed from their organisms and ...