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Mostrando ítems 46851-46860 de 112783
Synthesis, characterization and thermal behaviour of solid-state compounds of 2-methoxybenzoate with some bivalent transition metal ions
(Editora Unesp, 2005-01-01)
compostos M-2-MeO-Bz foram sintetizados no estado sólido, onde M representa os íons bivalentes Mn, Co, Ni, Cu e Zn e 2-MeO-Bz é o anion 2-metoxibenzoato. Esses compostos foram caracterizados e estudados, utilizando-se ...
Mullite whiskers grown from erbia-doped aluminum hydroxide-silica gel
(Amer Ceramic Soc, 2000-01-01)
Mullite whiskers and anisotropic grains that were derived from erbia-doped aluminum hydroxide-silica gel were studied. Firing 3.0-mol%-erbia-doped isostatically pressed pellets at 1600 degrees C for 1.0-8.0 h resulted in ...
SiO2-PbF2-CdF2 glasses and glass ceramics
(Elsevier B.V., 2003-01-01)
Lead-Cadmium fluorosilicate stable glasses were prepared and the vitreous domain region determined in the composition diagram. Characteristic temperatures were obtained from thermal analysis and the structural studies ...
Stress intensity factor threshold in dental porcelains
(SPRINGER, 2008)
The stress intensity factor threshold (K(IO)) is related to the stress level at which cracks start to grow stably, causing the weakening of porcelain prostheses during their use. The values of K(IO) of seven dental porcelains ...
Accurate and Precise Zinc Isotope Ratio Measurements in Urban Aerosols
(AMER CHEMICAL SOC, 2008)
We developed an analytical method and constrained procedural boundary conditions that enable accurate and precise Zn isotope ratio measurements in urban aerosols. We also demonstrate the potential of this new isotope system ...
O programa de saúde bucal para crianças pré-escolares em Araraquara-SP-O desempenho em 1988.
(1990-12-01)
This paper reports the composition change of the dmf-teeth index, outcome from dental health program for the 3 to 6 year old pre-school children population, enrolled in kindergartens in Araraquara-SP, in 1988. The program ...
Photoexpansion and photobleaching effects in oxysulfide thin films of the GeS2+Ga2O3 system
(Elsevier B.V., 2011-12-01)
Oxysulfide systems undergo structural transformations upon illumination with laser light of near bandgap energy, as well as chalcogenide materials (glasses and films). In this paper, photoinduced effects such as photoexpansion ...
Maintenance requirements for methionine and cysteine, and threonine for poultry
(South African Journal of Animal Sciences, 2011-01-01)
This study aimed to estimate the methionine & cystine (M&C), and threonine (THR) requirements for maintenance of adult roosters differing in liveweight and body composition, and to estimate the concentrations of M&C and ...
Alelopatia de Leucena sobre soja e plantas invasoras
(Universidade Estadual de Londrina (UEL), 2009-01-01)
With the advance of agriculture, there was consequent rising in environment degradation. Therefore, It is interesting the use of plants which have in their chemical composition substances capable of helping in the control ...
The geotectonic environments of Early Precambrian granulites in Brazil
(1979-01-01)
A review is presented concerning Archaean granulites occurring in some old domains of the South American Platform, which was consolidated at the end of the Brazilian Cycle (900-500 Ma). The rocks occur in different geotectonic ...