In this paper,we propose a new scheme to cool and trap neutral atoms by using a blue-detuned localized hollow beam (LHB),and studied the dynamical process of intensity-gradient cooling of the trapped atoms in the LHB by means of Monte-Carlo simulations.

Laser cooling and trapping of neutral atoms, include the intensity gradient cooling and optical dipole traps with blue-detuned laser field are briefly introduced in this thesis.

The product properties such as tensile strength and electric conductivity effected by cooling strength and deformation were studied.

Compounds in 7A52 alloy may not influence the processing property of product by means of three process parameters,such as,controlling the main element Mn in 7A52 alloy,and by aid of special moulding system and reasonably controlling cooling strength.

Because taking some measures,such as selecting hot air valve with reasonable structure,improving cooling system of hot air valve and increasing cooling strength of hot air valve,etc,the service life of hot air valve is increased greatly in the practical process of vapourizing cooling of hot air valve in NO.

After transformation, the circulating water of 2# 750m3 BF is increased to 1230 m3/h, the head of circulating pump is increased to 60m, and the intensity of cooling is improved, the life of cooling stave is extended to 2 years, the system's operating security is improved, and the annual benefit of power economy is 0.

Influence of mould cooling intensity on the strand shell homogeneity in the initial solidification areas;

To ferrite/pearlite steel,the process consisting of low water cooling intensity,5～10 ℃/s cooling velocity,and high temperature controlled rolling can get better effect than single controlled rolling.

The paper contributes main reasons for damage of cooling staves at row 4, 5, and 6 at Tiantie Metallurgical Group BF 2 to inadequate experience to new equipment, low cooling intensity and the effect by the detrimental elements from the stave material.