National Institute Of Materials Physics - Romania

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5974 articles found

5501. DISTRIBUTION FUNCTION OF PRECIPITATED TIO2 PARTICLE VOLUMES

Authors: MANOLESCU, A; MANAILA, R; MEZINCESCU, GA; NISTOR, L; TEODORESCU, V; SERBAN, S; IOVITA, V

Published: OCT 1990, REVISTA DE CHIMIE, 41, 815, DOI:

The distribution function of precipitated particles in relation to their volume is modelled by a function reproducing the three moments of the real function. The time evolution of the distribution is simulated by the numerical solving of a non-linear differential equation system for the moments, resulting from the rate equation which describes the growth of the particles.

5502. UTILIZATION OF NMR-SPECTROSCOPY FOR THE DETERMINATION OF POLYACRYLAMIDE SOLUTIONS CONCENTRATION

Authors: CONTINEANU, M; CONSTANTINESCU, O

Published: SEP 1990, REVISTA DE CHIMIE, 41, 730, DOI:

A method of the determination of the concentration of the Medasol type hydrolized and non-hydrolized polyacrylamide in aqueous solution by higy resolution MNR is presented. The method may be applied to dilute solutions under the conditions presented in this paper.

5503. ON THE BOND ORIENTATIONAL ORDER IN ICOSAHEDRAL PHASES

Authors: RADULESCU, O; MANAILA, R

Published: SEP 1990, PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 161, 73, DOI: 10.1002/pssb.2221610105

5504. INFLUENCE OF PHOSPHORIC-ACID AND OF PERCHLORIC-ACID ON ELECTROFORMATION OF ELECTRODES OF LEAD-SULFURIC ACID BATTERIES

Authors: MATEESCU, AG; MATEESCU, D

Published: SEP 1990, REVISTA DE CHIMIE, 41, 723, DOI:

The microstructure modifications have been studied during the electroformation of positive and negative plates which give information regarding the optimal conditions for the obtaining of plates for lead batteries. The microstructure proved to depend on the conditions under which the electroformation takes place and on the nature of the electrolyte additions. The SEM studies showed that in the positive active mass, the particles are heterogeneously scattered and that they consist of amorphous and crystalline areas.

5505. TECTONIC IMPLICATIONS OF PALEOMAGNETIC RESEARCH INTO UPPER CRETACEOUS MAGMATIC ROCKS IN THE APUSENI MOUNTAINS, ROMANIA

Authors: PATRASCU, S; BLEAHU, M; PANAIOTU, C

Published: AUG 20 1990, TECTONOPHYSICS, 180, 322, DOI: 10.1016/0040-1951(90)90316-Z

5506. CONSTRAINTS ON THE CHARGE-CORRELATION FUNCTION FOR 2-DIMENSIONAL QUANTUM-SYSTEMS

Authors: MANOLESCU, A; MEZINCESCU, GA

Published: AUG 15 1990, PHYSICAL REVIEW A, 42, 2046, DOI: 10.1103/PhysRevA.42.2042

5507. TRANSMISSION OF LIGHT THROUGH DETERMINISTIC APERIODIC NON-FIBONACCIAN MULTILAYERS

Authors: DULEA, M; SEVERIN, M; RIKLUND, R

Published: AUG 15 1990, PHYSICAL REVIEW B, 42, 3689, DOI: 10.1103/PhysRevB.42.3680

5508. HOPPING CONDUCTIVITY OF THE INTERACTING HONEYCOMB LATTICE GAS

Authors: PITIS, R

Published: AUG 1 1990, PHYSICAL REVIEW B, 42, 2520, DOI: 10.1103/PhysRevB.42.2514

5509. INCORPORATION AND AGGREGATION PROPERTIES OF BISMUTH IONS IN KCL CRYSTALS

Authors: NISTOR, SV; STOICESCU, G; MATEESCU, CD

Published: AUG 1990, PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 160, 431, DOI: 10.1002/pssb.2221600205

5510. MOSSBAUER INVESTIGATIONS OF THE FE-CU-MN CATALYSTS FOR FISCHER-TROPSCH SYNTHESIS

Authors: SPANU, V; FILOTI, G; ILIE, I; ZAMFIRESCU, E

Published: JUL 1990, HYPERFINE INTERACTIONS, 57, 2113, DOI: 10.1007/BF02405772