Light Emitting Diodes
Mostrando 13-24 de 75 artigos, teses e dissertações.
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13. The Compact Irradiator Modulus Designed for DNA Repair and Mutagenesis Studies in ISS Microgravity Environment Using UVA Emitted by Light-Emitting Diodes
ABSTRACT: This work presents the design and characteristics of a new compact ultraviolet (UV) irradiator used in a biological onboard space flight experiment. The experiment, called DRM, took place in the International Space Station research facility (ISS-13 expedition), during the Centenary Mission (Russian-Brazil) in March-April 2006. The DRM main objectiv
J. Aerosp. Technol. Manag.. Publicado em: 2014-09
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14. The use of light-emitting diodes (LED) in commercial layer production
Artificial lighting is one of the most powerful management tools available to commercial layer producers. Artificial light allows anticipating or delaying the beginning of lay, improving egg production, and optimizing feed efficiency. This study aimed at comparing the performance of commercial layers submitted to lighting using different LED colors or conven
Rev. Bras. Cienc. Avic.. Publicado em: 2013-06
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15. Human photopic ON- and OFF-ERG responses elicited by square wave and sawtooth stimuli
In this study, the on- and off-responses elicited by luminance square wave and sawtooth stimuli at different temporal frequencies and contrasts are described quantitatively. Adding on- and off-responses reveals response asymmetries. Full-field stimuli were produced using a Ganzfeld bowl with arrays of light-emitting diodes (LEDs) as light sources. ERG respon
Psychol. Neurosci.. Publicado em: 2013
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16. Ruído elétrico em um LED branco de alta eficiência em frequências acima da região do ruído Flicker / Measurements of electrical noise in a high-efficiency LED beyond the Flicker noise region
Este trabalho descreve os procedimentos experimentais e as justificativas que levaram à determinação de uma relação entre a densidade de tensão de ruído em altas frequências e a temperatura da junção de um LED branco de alta eficiência. As medições da densidade de tensão de ruído foram realizadas polarizando o LED com correntes na faixa de 1 m
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/07/2012
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17. Os efeitos biomoduladores da fototerapia e do treinamento resistido no tecido muscular e ósseo de ratas ovariectomizadas / Biomodulators effects of phototherapy and resistance training in the bone and muscle tissue of ovariectomized rats
O treinamento resistido (TR) é utilizado para prevenir e recuperar a sarcopenia e a osteoporose e, a terapia por Diodos Emissores de Luz - Light Emitting Diodes Terapy (LEDT) age como preventivo e curativo de lesões osteoneuromioarticulares. Essas premissas definiram como propósito desse estudo avaliar a associação da LED com o TR na prevenção da sarc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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18. Effect of light sources and curing mode techniques on sorption, solubility and biaxial flexural strength of a composite resin
Adequate polymerization plays an important role on the longevity of the composite resin restorations. OBJECTIVES: The aim of this study was to evaluate the effect of light-curing units, curing mode techniques and storage media on sorption, solubility and biaxial flexural strength (BFS) of a composite resin. MATERIAL AND METHODS: Two hundred and forty specime
Journal of Applied Oral Science. Publicado em: 2012-04
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19. Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs
OBJECTIVE:This study aimed at evaluating the degree of conversion (DC) of four composite resins, being one nanofilled and 3 microhybrid resins, photo-activated with second- and third-generation light-emitting diodes (LEDs). MATERIAL AND METHODS: Filtek TM Z350 nanofilled composite resins and Amelogen® Plus, Vit-l-escenceTM and Opallis microhybrid resins wer
Journal of Applied Oral Science. Publicado em: 2012-04
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20. Influence of different shades and LED irradiance on the degree of conversion of composite resins
The aim of this study was to evaluate the degree of conversion (DC) of two composite resins with different shades that were light cured by light-emitting diodes (LEDs) of different irradiances. Specimens (5 mm ' 2 mm) were prepared with a nanofilled (Filtek Supreme - A2E, A2D, and WE) or microhybrid resin (Opallis - A2E, A2D, and EBleach Low) and were random
Brazilian Oral Research. Publicado em: 24/02/2012
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21. Construction and application of a portable microcontrolled turbidimeter for the in situ determination of sulfate
This study reports on the construction of a turbidimeter employing light emitting diodes as radiation source at a wavelength of 405 nm, a photodiode as detector, a temperature sensor and a microcontroller used for data acquisition and processing. The turbidimeter was applied to determine sulfate concentrations in natural water employing barium chloride as re
Química Nova. Publicado em: 2012
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22. Montagem da técnica Photo-CELIV para obtenção de parâmetros de condução em filmes finos de polímeros eletrônicos / CELIV technique assembly for conduction parameters obtainment in electronic thin films polymers
A eletrônica orgânica, isto é, aquela baseada em compostos orgânicos principalmente por átomos de Carbono, Hidrogênio, Nitrogênio, etc., vem mostrado um notável desenvolvimento nos últimos anos, pois tem aberto novas aplicações e novos mercados na área da eletrônica. Displays flexíveis e de alta resolução feitos a partir de polímeros conjuga
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/05/2011
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23. Effect of different light curing methods on mechanical and physical properties of resin-cements polymerized through ceramic discs
OBJECTIVE: The aim of this study was to compare the polimerization ability of three different light-curing units (quartz tungsten halogen, light-emitting diodes and plasma arc) and their exposure modes (high-intensity and soft-start) by determination of microhardness, water sorption and solubility, and diametral tensile strength of 5 dual-curing resin cement
J. Appl. Oral Sci.. Publicado em: 01/07/2011
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24. Effect of reduced exposure times on the cytotoxicity of resin luting cements cured by high-power led
OBJECTIVE: Applications of resin luting agents and high-power light-emitting diodes (LED) light-curing units (LCUs) have increased considerably over the last few years. However, it is not clear whether the effect of reduced exposure time on cytotoxicity of such products have adequate biocompatibility to meet clinical success. This study aimed at assessing th
Journal of Applied Oral Science. Publicado em: 2011-06