Light-emitting diodes can function as spectrally selective detectors in a miniature, inexpensive sun photometer that measures atmospheric turbidity and precipitable water.

Introduction: Light elements, H and He, covering the solar surface are widely believed to be dominant inside the Sun [1]. Noting that gaseous envelopes may not reflect the Sun’s internal composition, Harkins [2] used analyses on 443 meteorites to conclude that Fe, O, Ni and Si are more abundant. B2FH [3] explained element synthesis in stars; decades later Fowler said laboratory and theoretical ...

UNLABELLED • PREMISE OF THE STUDY Few studies have analyzed the physiological performance of different life stages and the expression of ontogenetic niche shifts in lianas. Here, we analyzed the photosynthetic and morphological acclimation of seedlings of Stigmaphyllon lindenianum, Combretum fruticosum, and Bonamia trichantha to distinctive light conditions in a tropical dry forest and compar...

Work during 1870-1970 had shown that spherically symmetric electromagnetic, gravitational, or massless-neutrino energy flows were impossible. These impossibilities were thought by their discoverers to be isolated results dependent on the field equations obeyed by these kinds of energy. But we now show that they are consequences of extremely general and simple topological impossibilities, and ha...

1. Vitamin D-Defficiency or Infantile Rickets: This is extremely rare in the Sudan owing to the availability of sun-shine throughout the year. Since infantile rickets is common in some other African countries where sun-shine is also constant throughout the year, other factors, which obstruct the natural ultraviolet irradiation e.g. crowded housing and overprotection of infants must be operating...

In complex aeronautical and space engineering systems, conventional sensors used for environment perception fail to determine the orientation because of the influences of the special environments, wherein geomagnetic fields are exceptional and the Global Positioning System is unavailable. This paper presents a fisheye-lens-based visual sun compass that is efficient in determining orientation in...

BACKGROUND The objective of this study was to determine the factors associated with sun exposure behaviors among Operating Engineers (heavy equipment operators). METHODS Operating Engineers (N = 498) were asked to complete a cross-sectional survey. Linear and logistic regression analyses were used to determine health behavioral, perceptional, and demographic factors associated with sun exposu...

The Sun based vitality is rapidly progressing as an essential method for renewable energy resources. More vitality is obtained by tracking the solar panel, by placing the panel remains related to the sun at a right edge to the beams of light. It illustrates the point of interest of outline and development of a model for solar tracking system with two degrees of opportunity, which recognizes the...

OBJECTIVE An analysis of Canadian survey data was performed to identify independent predictors of different protective behaviours and of their use in combination. METHODS Data from light-skinned respondents of the 1996 National Survey on Sun Exposure & Protective Behaviours who spent 30+ minutes per day of their leisure time in the sun (N = 1,027) were analyzed. Multivariable logistic regress...