in this paper, the bouncing movementof the blocks in the debris flow is assumed, a singleblock s movement in the stable flow field is analyzed,the relation of the number density with the heightand the relation of the mean diameter of the blockswith the height are obtained with some hypothe-ses and numerical computation, and the abnormaldistribution in the debris flow is explained quanti-tatively.

The number density and energy density of particles with weak interaction in early universe were discussed.

We studied the number density and quality of airborne particulate during two dense fog times in the eastern Chengdu,using automatic particle laser counter and Anderson sampler.

Atmospheric aerosol number concentration, atmospheric visibility and particulate mass concentrations, such as PM10, PM2.

Atmospheric aerosol particulate size distribution, number concentration of aerosol, atmospheric visibility and particulate mass concentrations, such as PM10, PM25 and PM10 were detected by an optical particle counter (OPC), a visibility meter and ambient particulate monitors respectively at the same time in Beijing during the winter of 2001.

Study on force density function and stress field analysis of the waved-edge milling insert;

Solving a kind of integral problem by using the normalization of the probability density function;

Formula of density function of sum of independent random variable of uniform distribution;

On the basis of the Study of stand increment model on Japanese larch, the naural sparse model ofJapanere Larch everr-aged stand was simulatal by means of Reineke density index in this paper.

To calculate the density index,the population related index(PRI) and the killing rate of mosquito larvae to evaluate the efficacy of the larvicides against mosquito larvae.