Luminance distribution of clear sky and the resultant horizontal illuminance

Color and luminance asymmetries in the clear sky.

A long-standing assumption about the clear sky is that its colors and luminances are distributed symmetrically about the principal plane. As useful as this approximation is, our digital-image analyses show that clear-sky color and luminance routinely depart perceptibly from exact symmetry. These analyses reconfirm our earlier measurements with narrow field-of-view spectroradiometers [J. Opt. So...

a comparative analysis of the marginal microleakages of two pit and fissure sealans, conseal-f and conseal clear

چکیده ندارد.

Vertical Illuminance Measurement for Clear Skies in Tehran

Intelligent Lighting Control Using Correlation Coefficient between Luminance and Illuminance

An intelligent lighting system which provides required illumiancne at an appropriate location is proposed. This system does not have the centralized control device and also it is controlled by each intelligent lighting’s autonomous operation. Also the intelligent lighting system can contribute to energy saving. In this research, a new algorithm is proposed. For rapid converges it uses the corre...

Polarization singularities in the clear sky

Ideas from singularity theory provide a simple account of the pattern of polarization directions in daylight. The singularities (two near the Sun and two near the anti-Sun) are points in the sky where the polarization line pattern has index +1/2 and the intensity of polarization is zero. The singularities are caused by multiple scattering that splits into two each of the unstable index +1 singu...