Objective To analyse the resistant profile of 135 strains of Staphylo coccus isolated from our hospital to 8 antimicrobial agents and to investigate t he isolation rate of β-lactamase of various resistance level MRSs (methecillin resistant Staphylococcus).

On lightning withstand level of composite insulators;

The influence of the line arrester on the lightning withstand level of 35 kV transmission lines was simulated and calculated by electromagnetic transient software ATP-EMTP.

There are two indexes to evaluate the power line performance on preventing lightning strikes: the one is the lightning trip-out rate,the other is the lightning withstand level of the power line.

For the purpose of improving the ability of lightning protection for the high voltage power transmission line,taking account of the facts which influenced the lightning protection level,an assessment model was established and the comprehensive judgement on the lightning protection level was obtained by means of computers.

The formula for the calculation of the lightning protection level of the transmission line is revised by theoretic deduction for the rational determination lightning protection level and lightning trip-out rate of the transmission line.