Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 2 de 2
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Conf Proc IEEE Eng Med Biol Soc ; 2016: 2083-2086, 2016 08.
Artigo em Inglês | MEDLINE | ID: mdl-28268741

RESUMO

People with low vision have limited residual vision that can be greatly enhanced through high levels of magnification. Current assistive technologies are tailored for far field or near field magnification but not both. In collaboration with L.V. Prasad Eye Institute (LVPEI), a wearable, optical-digital assistive device was developed to meet the near and far field magnification needs of students. The critical requirements, system architecture and design decisions for each module were analyzed and quantified. A proof-of-concept prototype was fabricated that can achieve magnification up to 8x and a battery life of up to 8 hours. Potential user evaluation with a Snellen chart showed identification of characters not previously discernible. Further feedback suggested that the system could be used as a general accessibility aid.


Assuntos
Dispositivos Ópticos , Equipamentos de Autoajuda , Baixa Visão , Humanos , Estudantes , Acuidade Visual
2.
Small ; 9(7): 1058-65, 2013 Apr 08.
Artigo em Inglês | MEDLINE | ID: mdl-23233398

RESUMO

The optical absorption efficiencies of vertically aligned multi-walled (MW)-carbon nanotube (CNT) ensembles are characterized in the 350-7000 nm wavelength range where CNT site densities > 1 × 10(11) /cm(2) are achieved directly on metallic substrates. The site density directly impacts the optical absorption characteristics, and while high-density arrays of CNTs on electrically insulating and non-metallic substrates have been commonly reported, achieving high site-densities on metals has been challenging and remains an area of active research. These absorber ensembles are ultra-thin (<10 µm) and yet they still exhibit a reflectance as low as ∼0.02%, which is 100 times lower than the reference; these characteristics make them potentially attractive for high-sensitivity and high-speed thermal detectors. In addition, the use of a plasma-enhanced chemical vapor deposition process for the synthesis of the absorbers increases the portfolio of materials that can be integrated with such absorbers due to the potential for reduced synthesis temperatures. The remarkable ruggedness of the absorbers is also demonstrated as they are exposed to high temperatures in an oxidizing ambient environment, making them well-suited for extreme thermal environments encountered in the field, potentially for solar cell applications. Finally, a phenomenological model enables the determinatiom of the extinction coefficients in these nanostructures and the results compare well with experiment.


Assuntos
Luz , Nanotecnologia/métodos , Nanotubos de Carbono/química , Microscopia de Força Atômica , Modelos Teóricos , Nanotubos de Carbono/ultraestrutura , Raios Ultravioleta
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA