Optical Scanner
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Galvanic vestibular stimulator for fMRI studies
INTRODUCTION: Areas of the brain that are associated with the vestibular system can be activated using galvanic vestibular stimulation. These areas can be studied through a combination of galvanic vestibular stimulation with functional magnetic resonance imaging (fMRI). In order to provide an appropriate sequence of galvanic stimulation synchronous with the
Rev. Bras. Eng. Bioméd.. Publicado em: 2014-03
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2. Avaliação de dispositivos de captura de imagens digitais para detecção colorimétrica em microzonas impressas
This report describes a study about the feasibility of using a conventional digital camera, a cell-phone camera, an optical microscope, and a scanner as digital image capture devices on printed microzones. An array containing nine circular zones was drawn using graphics software and printed onto transparency film by a laser printer. Due to its superior analy
Quím. Nova. Publicado em: 2014
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3. GROSC: uma proposta de segmentação de caracteres impressos orientada a regiões em níveis de cinza
Os sistemas de Optical Character Recognition (OCR, ou Reconhecimento ótico de caracteres em português) designam genericamente tecnologias para reconhecer caracteres a partir de um arquivo de imagem que contenha textos. Permite, por exemplo, que uma folha de texto impresso, ao ser digitalizada, possa ser convertida em um arquivo de texto editável. Esses si
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/10/2011
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4. Shielded transceiver RF coil array for simultaneous PET-MRI
The complementary information provided by combined MRI-PET modalities promises to facilitate metabolic investigations of complex physiological processes. We developed a radio frequency (RF) coil array that can operate in close proximity (2-mm radial distance) to a miniaturized PET camera insert for simultaneous PET-MRI of a rat brain at high magnetic fields
Brazilian Journal of Physics. Publicado em: 2008-06
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5. Digitizing radiographic films: a simple way to evaluate indirect digital images
OBJECTIVES: This study applied a simple method to evaluate the performance of three digital devices (two scanners and one digital camera) using the reproducibility of pixel values attributed to the same radiographic image. METHODS: Using the same capture parameters, a radiographic image was repeatedly digitized in order to determine the variability of pixel
Journal of Applied Oral Science. Publicado em: 2007-02
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6. Construction and evaluation of a laser induced breakdown spectroscopy instrument: application in alloy samples / Construção e avaliação de um instrumento para espectroscopia de emissão em plasma induzido por laser (LIBS) : aplicação em ligas metalicas
In this work a time resolved LIBS instrument (TRELIBS) was built and its performance evaluated in qualitative and quantitative analysis. Additionally, exploratory studies are presented on the influence of parameters that affect the LIBS analysis. The instrument was built employing optical systems and devices of modern technology: an ICCD device, an echelle p
Publicado em: 2007
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7. Preparation and study of photodegraded polimeric matrix composites for photovoltaic cells encapsulation / Preparação e estudo da fotodegradação de compósitos de matriz polimérica para encapsulamento de células fotovoltaicas
The solar cells components are made off blades and metallic and ceramic semiconductors films. Such materials are not inert to the terrestrial atmosphere action. In this context, important part of the fotovoltaics modules production includes stages for the cells protection. These will have to be preserved from aggressive actions of the environment, for what t
Publicado em: 2007
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8. Defesas foliares em resposta à herbivoria em espécies lenhosas de restinga,Ipojuca-PE
The leaf, the major photosynthetic plant organ, has the important function to adjust the plants to different habitats through morphological, chemical and physiological changes as a defense against the environmental factors. The chewing insects, the major consumers of leaf tissues, prejudice the behavior of the plants through the consumption of the photosynth
Publicado em: 2007
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9. Investigação do uso de imagens mamográficas adquiridas em diferentes digitalizadores no desempenho do processamento de imagens para detecção de microcalcificações / Investigation of the use of mammographic images digitized in different scanners for detection of clustered microcalcifications
This work is intended in comparing the results from a mammographic images processing scheme considering images sets digitized by a laser and by an optical scanners (Lumiscan50 and Umax Powerlook 1120 units, respectively). By means of a statistical analysis, we could verify that the optical scanner yields a remarkable increase in the digitized image intensity
Publicado em: 2006
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10. SÃntese, caracterizaÃÃo e aplicaÃÃo de polianilina obtida atravÃs de uma nova rota fotoquÃmica
In this work we present an alternative route to obtain polyanilin e silver composite (PANI/Ag). The method consists to use light of wavelength 254 nm and aqueous solution of silver nitrate (AgNO3) to promote the anilinium mono mer polymerization and the consequent silver ions reduction. The composite was characterized by microanalysis technique, X-ray diffra
Publicado em: 2006
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11. Contribuições para melhoria do desempenho e viabilidade de fabricação de scanners indutivos / Contributions to improve the performance, and the manufacture viability of inductive scanners
Scanners are devices that deftects a light beam and converts a spot light in a well controlled amplitude and frequency scan line. Several applications uses the generated pattem to code or decode data, common examples ar,e barcode readers, and laser printers. A light beam can be deftected by different means. In this work, the scanner deftects the light by ref
Publicado em: 2006
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12. Automated control of light beam scanners / Controle automatizado para scanners de luz
The work presents a method for automatically positioning of the light beam scanners. A strategy for synchronizing their positions based on the audio signals is also developed All control modes developed are incorporated into a managing system software. The controlling process requires the construction of a digital data interface to the hardware on the basis
Publicado em: 2004