Color Centers
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. The optical absorption of gamma irradiated and heat-treated natural quartz
Quartz with aluminum as impurity absorbs energy from ionizing radiation and modifies its color. Colorless quartz becomes smoky or dark smoky (morion quartz) when exposed to gamma rays. By heat-treatment, smoky quartz may become successively greenish, yellowish, or brownish as the irradiation dose increases. Natural, colorless quartz is routinely colored by i
Materials Research. Publicado em: 2005-09
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14. Centros de cor, centros paramagnéticos e centros de luminescência dependentes de defeitos pontuais em zirconita / Color center, paramagnetic center and luminescence center due the defect point in zircon
In the present work the investigation of some properties of Thermoluminescence (TL), Electronic Paramagnetic Resonance (EPR) and Optical Absorption (OA) of two samples of zircon (of brown color) from Minas Gerais, but the unknown exact origin, were carried out. The glow curves of thermoluminescence emission have shown the presence of 4 TL peaks at 140, 215,
Publicado em: 2005
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15. Coevolución de interacciones hospedante - patógeno en frijol común
Coevolution in bean pathosystems have been demonstrated. Based on morphologial traits (seed color and size, growth habit, leaf shape, and pod size) seed protein type, serological reactions, isozymes analysis, and polymorphic patterns using molecular techniques (RFLP, RAPD, AFLP), two domestication centers of common bean have been proposed. They are Mesoameri
Fitopatologia Brasileira. Publicado em: 2003-06
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16. Estudo de caso sobre o papel dos fluxos de calor latente e sensível em superfície em processos de ciclogênege de costa leste ocorrido na costa da América do Sul / A case study of the role of surface latent and sensible heat fluxes in South America east coast cyclogenesis
Foram realizadas simulações com o objetivo de estudar o impacto dos Fluxos de Calor Total (FCT)de Calor Latente (FCL)e de Calor Sensível (FCS)em superfície sobre o desenvolvimento de uma ciclogênese explosiva observada na costa leste da América do Sul ocorrida no período de 28 a 30 de maio de 1999. Também verificou-se o papel da Corrente do Brasil ne
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 200102
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17. Estudo de caso sobre o papel dos fluxos de calor latente e sensível em superfície em processos de ciclogênege de costa leste ocorrido na costa da América do Sul / A case study of the role of surface latent and sensible heat fluxes in South America east coast cyclogenesis
Foram realizadas simulações com o objetivo de estudar o impacto dos Fluxos de Calor Total (FCT)de Calor Latente (FCL)e de Calor Sensível (FCS)em superfície sobre o desenvolvimento de uma ciclogênese explosiva observada na costa leste da América do Sul ocorrida no período de 28 a 30 de maio de 1999. Também verificou-se o papel da Corrente do Brasil ne
Publicado em: 2001
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18. Criação e caracterização óptica em cristais de KI / Growth and optical characterizations of color centers in KI
No presente trabalho apresentamos um outro método para criação de centros de cor, em matrizes de KI puro, através da absorção de dois fótons. Este processo possui uma característica útil: a coloração é realizada a baixa temperatura, ao contrário de outros métodos, que necessitam aquecer o cristal até próximo a ponto de fusão, fazendo com que
Publicado em: 1999
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19. Construção de um laser de centro de cor para aplicações em espectroscopia. / Development of a color center laser for spectroscopy application.
The present work shows the development of a color Center laser for spectroscopy application. It is a CW laser which uses an X-type cavity with two astigmatically compensated intracavity spherical mirrors. The laser can be converted to a ring laser. The used active medium was a KCl:Li+ single crystal with a FA (II) centers and the pumping source was an Ar+ la
Publicado em: 1986
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20. The anterior cingulate cortex mediates processing selection in the Stroop attentional conflict paradigm.
Regional cerebral blood flow, an index of local neuronal activity, was measured using positron emission tomography (PET) during the performance of the classic Stroop color/word task in eight healthy right-handed subjects. In the first condition of this paradigm, subjects name the color of the words presented on a video monitor. All the words are the color na
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21. Color and genomic ancestry in Brazilians
This work was undertaken to ascertain to what degree the physical appearance of a Brazilian individual was predictive of genomic African ancestry. Using a panel of 10 population-specific alleles, we assigned to each person an African ancestry index (AAI). The procedure was able to tell apart, with no overlaps, 20 males from northern Portugal from 20 males fr
The National Academy of Sciences.
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22. Relationships between orientation-preference pinwheels, cytochrome oxidase blobs, and ocular-dominance columns in primate striate cortex.
The relationships between cytochrome oxidase blobs, ocular-dominance columns, and iso-orientation domains, subsystems underlying visual perception, were explored in primary visual cortex of macaque monkey. High-resolution maps of these three subsystems were acquired. Optical imaging based on activity-dependent intrinsic signals revealed that the most promine
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23. Uses of inorganic hypochlorite (bleach) in health-care facilities.
Hypochlorite has been used as a disinfectant for more than 100 years. It has many of the properties of an ideal disinfectant, including a broad antimicrobial activity, rapid bactericidal action, reasonable persistence in treated potable water, ease of use, solubility in water, relative stability, relative nontoxicity at use concentrations, no poisonous resid
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24. Evaluation of a New Selective Enrichment Broth for Detection of Group B Streptococci in Pregnant Women
Studies at two Brown Medical School-affiliated hospitals were undertaken to evaluate a new selective broth medium (GBS broth) and to compare it to the LIM broth currently used to culture for group B streptococci. Beta-hemolytic group B streptococci produce a carotenoid pigment that turns GBS broth an orange color. From a total of 580 pregnant women, duplicat
American Society for Microbiology.