in this study, estimation of global and diffuse solar radiations of selected cities in nigeria was carried out to assess the feasibility of solar energy utilization. the results of this work show the variation of direct and diffuse component of solar radiation in summer and winter months. the contribution of diffuse solar radiation is high during the monsoon months whereas sky conditions are cl...

A mathematical method for accurately determining the upper and lower diffuse-fraction (kd) limits that divide sky into clear, intermediate, overcast is developed. Fourteen sites around world are selected demonstrating methodology. The kd values these determined from scatter plots of direct-normal solar radiation vs. pairs over typical meteorological year each site. They vary between 0.73 0.80 0...

BACKGROUND Birmingham is the largest UK city after London, and central Birmingham has an annual tuberculosis incidence of 80 per 100,000. We examined seasonality and sunlight as drivers of tuberculosis incidence. Hours of sunshine are seasonal, sunshine exposure is necessary for the production of vitamin D by the body and vitamin D plays a role in the host response to tuberculosis. METHODS We...

IMPORTANCE It has been observed that suicidal behavior is influenced by sunshine and follows a seasonal pattern. However, seasons bring about changes in several other meteorological factors and a seasonal rhythm in social behavior may also contribute to fluctuations in suicide rates. OBJECTIVE To investigate the effects of sunshine on suicide incidence that are independent of seasonal variati...

In this paper, several equations were employed to estimate global solar radiation from sunshine hours for a meteorological station in Nigde, Turkey, using only the relative duration of sunshine. These equations included the original Angstrom-Prescott linear regression and modified functions (quadratic, logarithmic and exponential functions). Estimated values were compared with measured values i...

This study is a retrospective analysis of medical findings of patients treated at the Department of Ophthalmology, Clinical Hospital Split, Croatia in the period of 1995-1999. Seventy-three cases of acute closed-angle glaucoma were analyzed and compared in relation to the meteorological factors--hours of sunshine, air temperature and atmospheric pressure. No significant statistical correlation ...

Sunshine hours are the only long term, reliable and available measured information that can be used to reach highly accurate estimates of solar radiation values on the Earth surface. In this paper the sunshine duration is used to estimate monthly average daily solar radiation on a horizontal surface, it can be used to predict solar radiation in different climatic region of Iran. According to th...