Fluorite
Mostrando 13-22 de 22 artigos, teses e dissertações.
-
13. Influencia do meio e tempo de armazenamento na resistencia a microtração de sistemas adesivos / Influence of time and storage medium in the microtensile bond strength of adhesive systems
The purpose of this study was to evaluate "in vitro" the microtensile bond strength of two adhesive systems applied to the dentin as a function of time and storage medium, as well as to illustrate, through Scanning Electron Microscope (SEM) images, the nanoleakage of the hybrid layer, which had its constituents evaluated by microanalysis (EDS). Eighty recent
Publicado em: 2008
-
14. Hydrothermal alteration of the Cerro La Mina gold prospect, Los Menucos, Patagonia Argentina : geology, remote sensing and stable isotopes / Alteração hidrotermal do prospecto aurifero Cerro La Mina, Los Menucos, Patagonia Argentina : geologia , sensoriamento remoto e isotopos estaveis
The epithermal Cerro La Mina prospect, located in the Los Menucos region, Patagonia Argentina, is currently being explored for epithermal precious-metal mineralization. Triassic hydrothermal activity produced intense alteration of rhyolites, andesites, ignimbrites, and tuffs of the Middle- to Late Triassic Los Menucos Group, in the Somún Curá massif. The u
Publicado em: 2007
-
15. Integração de dados geológicos, de sensoriamento remoto, espectrorradiométricos e geofísica aplicada à prospecção de depósitos filoneanos de fluorita hidrotermal no sudeste de Santa Catarina / Geological, remote sensing, spectrorradiometric and geophysical data integration applied for hydrothermal fluorite veins prospection in southeast Santa Catarina State, Brazil
Os processamentos de imagens orbitais efetuados através de técnicas de sensoriamento remoto geraram informações qualitativas de natureza textural (morfo-estruturas). Estas permitiram (1) o reconhecimento de áreas com diferentes padrões estruturais tendo diferentes potencialidades para a prospecção de fluorita, (2) a identificação de novos lineament
Publicado em: 2007
-
16. Level of knowledge of dental surgeons about dental fluorosis / NÃvel de conhecimento do cirurgiÃo-dentista no diagnÃstico diferencial da fluorose dentÃria
O incremento na incidÃncia da fluorose dentÃria ocorrido nos Ãltimos tempos, à motivo de preocupaÃÃo dos epidemiologistas em nÃvel nacional e internacional. A diferenciaÃÃo entre as alteraÃÃes do esmalte fluorÃtico e nÃo fluorÃtico leva a importantes decisÃes em epidemiologia e saÃde pÃblica bucal. O objetivo deste estudo à investigar a cap
Publicado em: 2007
-
17. Oxygen ion implantation in Strontium Bismuth Tantalate thin films
Strontium Bismuth Tantalate (SBT) ferroelectric thin films have attracted considerable attention for the development of non-volatile ferroelectric random access memories (NV-FRAMs). These films, however, have a critical problem: a high processing temperature ( > 700ºC) is required for the crystallization of the perovskite phase. The thermal evolution of the
Brazilian Journal of Physics. Publicado em: 2006-09
-
18. Caracterização das rochas vulcânicas e plutônicas félsicas e intermediárias do Alvo Estrela (Cu-Au), Serra de Carajás, Pará
The Estrela Cu-Au deposit is situated in the Serra do Rabo, at the easternmost part of Carajás shear zone, at the Serra dos Carajás region. It is hosted by altered andesites and gabbros and rhyolites of the Grão Pará Group, Itacaiunas Supergroup, formed at 2.76 Ga (Sm-Nd isochronic age) cut by Paleoproterozoic porphyritic quartz diorite, orthoclase-albit
Publicado em: 2006
-
19. Individual monitoring for external exposures: experimentation and simulation with Monte Carlo Method / Monitoração individual externa: experimentos e simulações com o método de Monte Carlo
In this work, we have evaluated the possibility of applying the Monte Carlo simulation technique in photon dosimetry of external individual monitoring. The GEANT4 toolkit was employed to simulate experiments with radiation monitors containing TLD-100 and CaF2:NaCl thermoluminescent detectors. As a first step, X ray spectra were generated impinging electrons
Publicado em: 2005
-
20. Sensoriamento remoto aplicado no estudo de estruturas geologicas com ocorrencias de depositos minerais, na porcao centro-norte do estado da Paraiba / Application of remote sensing to the study of geologic structures with the occurrence of deposits in the central-north part of Paraiba state
The Paraíba State includes part of the Borborema Pegmatitic Province. The Seridó Group occurs in this Province and has economic importance as host of several metallic (sheelite, beryl, cassiterite and tantalite) and non-metallic (barite, limestone, kaolinite and fluorite) deposits. This work aims to identify structural geologic patterns that may be associa
Publicado em: 1998
-
21. O Granito Passa Tres, PR e as minerações auriferas associadas
The proposition of a metallogenetic model to explain the origin and control of gold mineralization that occurs associated to the Passa Três Granite (PR) is the main aim of this work. This granitic body is believed to be a mesothermal NE-SW aligned intrusion wi th about 5 km2, controlled by a dextral strike-slip fault (ZCT). It has been intrusive into the Se
Publicado em: 1992
-
22. Nuclear magnetic resonance in superionics conductors with fluorite-type structure. / Ressonância magnética nuclear em condutores superiônicos de estrutura fluorita.
The 19F NMR relaxation times T1 and T2 were measured is ternary and nonstoichiometric compounds with the fluorite-type structure. We have studied the Na0.4Y0.6F2.2 crystal in the temperature range 600K to 900K, where the crystal hás not the fluorite structure. The T1 values were measured in two Larmor frequencies: 20.42 MHz and 34.24 MHz. The results for T1
Publicado em: 1990