In view of the defects of low sensitivity, poor detection limits, small number of determined elements and poor ability of matrix effect correction of the current field portable X ray fluorescence (XRF) analyzer, research work on key units of excitation source, detector, measurement circuit and microcomputerization was carried out.

This paper analyzed the necessity of reforming about teaching methods of practice, through studying the contents and methods of the practical fieldwork in the field of non-major surveying.

There is no mercy and pity,only wisdom and strength in the field survive.

Technology of Separating Strains of Macrofungi from Outdoors;

Rationality analysis of field test method for evaluation of geological condition of deposit;

in the paper, following an example of the pebble river bed,the determination of the incipient velocities of nonuniform sands is represented,the effect of the shapes (kurtosis)of pebbles on the incipient velocities is analysed,and then,the field test results on the incipient motion law of nonuniform sands are introduced and compared with those of the theoretical analysis.

Based on the chief drawbacks of present field test methods for hydrodynamic dispersion coefficient, an improvement for the slug injection test in radial flow and a hydrodynamic dispersion test in two-dimen-sional flow are presented.

Experimental study of cross-well seismic field acquisition methodology;

In field acquisition, the aims of acquiring detailed near surface information are to determine the near surface structure, select favorable exciting and receiving lithology, understand the law of seismic wave propagation in near surface, and provide necessary information for data processing methods such as statics and surface consistency.