Interdependent Analysis and Prediction on Atmospheric TSP and Natural Dust Suppression;

Study on the reciprocity between atmosphere natural dropping dusts and single strain human body surface normal bacteria in vitro;

Its operating principle lists as follows: first flushing fluid expelled from wellhead is decompressed throw sieve vessel,then sand,water and oil are separated by way of double natural sedimentation,finally,oil is recovered,water is recycled,and sa.

Research progress on natural degradation of linear alkyl benzene sulphonate in environment;

Natural degradation is the main way of removing organic pesticides in soils.

The progress on research status and method of natural degradation is summarized, and some critical discussion in experimental design is described from the point of biodegradation and photodegradation.

The free settling experiments for high-concentration material slurry of cement-full tailing backfill at a different ratio and different concentration are conducted and the effects of the related factors on settling property of the slurry are analyzed.

Free settling tests for tailings from the concentrator in the previous period were carried out.

According to the statistical analysis of long-term natural rainfall data from 1961 to 1999,combining field location and micro-area experiment,the four indexes for drought disaster evaluation were put forward based on the analysis of soil water content balance,namely water deficiency index,withering index,rainfall index,and drought index.