56 dtex×35 mm can be produced with high quality by introducing the advance technologies of radial outflow,cascade steam flasher and circle oiling.

Based on the expansion revamping of direct spinning production line of staple fibers in the 1980' s, the spinning process was studied to promote the quality of precursor by high density multihole spinnerette and low damping center ring blowing quench technology.

Directing against the fact of large variation range of fuel coal quality used for utility boilers, the combustion stability mechanism and adaptability to coal sort of the existing burners have been analysed, putting forward an assumption of once-through burner with adjustable central air flow.

The crosswind produces great effect on the handling stability of vehicle at high speed, which is related to the relative location between pressure center of the crosswind and neutral-steer point of the vehicle.

In the simulation analysis, pressure center s shift was taken into account for the first time.

During the whole process,pressure center s shift is taken into account for the first time.

The methods and technologies for positioning typhoon centers were studied and summarized systematically using the distribution of gray scale and the corresponding characteristics of brightness temperature on satellite infrared cloud imageries.