This paper, according to daylighting,based on an average sky, presents the influence coefficient of average sky, modifies the formula of calculating lateral windows and analysis the significance of energy saving in building by the influence coefficient.

On the bases of average sky model,this paper develops a set of day lighting nomograms which can be used to the skies in the average sky and also considers the effect of the sun on skylight and the effect of the wall space on daylightin

The annual average value and monthly mean value are obtained and compared to the concentrations of air ions outside the darkroom.

with the nature of the radial function of the hydrogen atom and the nature of the laguerre polynomials,the article deduced the formula that used to compute the average value of integer power (r~n) of the radial distance of the hydrogen atom-r.

Limitation and amelioration of the standard calculating method of pH average;

It adopts simple average PI regulator.

Describes the distributions, the average, the amplitude and time lags of indoor temperature measured from 144 living rooms or bedrooms of 98 households in Beijing during the summer of 1999.

The paper dealt with the defect of present value accounting,discussed the average value,distribution and marginal value of forest and pointed out the problems of ecological construction that should be paid attention to.