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[The prevalence and its screening methods of primary open angle glaucoma in defined population-based study of rural and urban in Beijing].
OBJECTIVE The purpose of the study is to determine the prevalence of primary open-angle glaucoma (POAG) in persons aged 40 or above in Beijing, China. METHODS From June 2001 to October 2001, theExpand
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[The prevalence and its effective factors of primary angle-closure glaucoma in defined populations of rural and urban in Beijing].
OBJECTIVE To investigate the prevalence of primary angle-closure glaucoma (PACG) of urban and rural residents in Beijing, China. A quantitative comparison was made based on the data collected fromExpand
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Temperature distribution analysis of high-speed railway roadbed in seasonally frozen regions based on empirical model
Abstract To study the roadbed temperature distribution rules in seasonally frozen regions, an empirical model based on three years' field monitored temperature data is proposed, which takes severalExpand
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[The application of digital photography with retroillumination for lens in cataract study].
We evaluate the reliability of digital photography with retroillumination for lens as a tool to assess the degree of lens opacity, and to study the morphological features of some lens diseases using the digital images. Expand
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[Prevalence of low vision and blindness in defined populations in rural and urban areas in Beijing].
OBJECTIVE To investigate the prevalence and causes of low vision and blindness in Beijing residents aged 40 and over. METHODS 4,451 residents aged 40 and over in 3 rural communities and 5 urbanExpand
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Abrasion Mechanism of Stainless Steel/Carbon Fiber-Reinforced Polyether-Ether-Ketone (PEEK) Composites
A new type of composite material, stainless steel fiber and carbon fiber-reinforced polyether-ether-ketone (PEEK), was investigated to study its friction and wear properties and mechanisms. TheExpand
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[Short hairpin RNA targeting vascular endothelial growth factor effectively inhibits expression of vascular endothelial growth factor in human retinal pigment epithelium].
OBJECTIVE To design shRNA targeted to human vascular endothelial growth factor (VEGF) and to evaluate the effect of VEGF. shRNA on expression of VEGF in human retinal pigment epithelium (RPE) cellsExpand
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Maintenance support systems analysis based on M/M/c/k queue model
This paper describes maintenance support as M/M/m/k queue process, of which the damaged equipment-arrival is subordinate to the independent Poisson distribution, and the maintenance-time the exponential distribution. Expand
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