RESUMO
We present a newly designed compact grating spectrometer for the energy range from 210 eV to 1250 eV, which would include the Kα(1,2) emission lines of vital elements like C, N, and O. The spectrometer is based on a grazing incidence spherical varied line spacing grating with 2400 l/mm at its center and a radius of curvature of 58 542 mm. First, results show a resolving power of around 1000 at an energy of 550 eV and a working spectrometer for high vacuum (10(-4) mbar) environment without losing photon intensity.
Assuntos
Espalhamento de Radiação , Análise Espectral/instrumentação , Elasticidade , Desenho de Equipamento , Raios XRESUMO
The Orinda Study was the first interdisciplinary effort to establish the validity of a vision screening protocol and led to the development of the clinically based Modified Clinical Technique (MCT), a protocol that has been in widespread use for the past 24 years. This paper reviews the original thoughts behind the study and its accomplishments and assesses the impact of the study on vision screening. Future obligations of optometrists and other vision screeners are discussed in view of the past benefits of the study.
Assuntos
Programas de Rastreamento/normas , Transtornos da Visão/prevenção & controle , Testes Visuais/normas , California , Criança , HumanosRESUMO
An analysis of the needs of the public for optometric services by (1) the examination of the epidemiology of vision problems, (2) a systems analysis of the vision care system, (3) the services optometrists provide and (4) the educational resources available, indicate that the priorities for optometric development should be on primary vision care services and new academic facilities.
