By comparing the scan pictures made by ~(75) Se radiographic source,~(192) Ir radiographic source and X-ray on steel piates with different thickness,it is proven that the ~(75) Se radiographic sorce is of better tolerance,it is provided that the scanning thickness can be reduced to 4 mm in order to facilitate the radiographic inspection of small-diameter pipes.

The actual thickness calculation methods of the asphalt adding paving course are analyzed.

Weir Plate Thickness Calculation for Horizontal Vessels;

After having studied the new standard GB150-1998, the author stated and analyzed, in this paper, the main differences on the provisions of calculation pressure, design pressure,calculated thickness, practical shell thickness, pressure test and leakage test from the same provisions in GB150 - 89.

When the pressure vessel is designed without checking hole, the calculated thickness of the pressure vessel written on the drawing, sometimes, is not the same illustrated in GB150-89.

“Lumer” includes modules such as the selection and arrangement of lamps,illuminance calculation,glare evaluation.

The way of lamp layout was introduced in detail,and the method of illuminance calculation of lighting design in stadium.

Discussion on the illumination calculation based on green illumination design;

Studies on Illumination Calculation Method Based on Artificial Neural Network;