Objective To investigate bacterial contamination of throat sprays before and after they were used and to search for satisfactory disinfecting method,in an effort to reduce the risk of hospital acquired infections.

Objective To investigate the bacterial contamination of throat spray before and after using,so as to explore satisfactory disinfection methods to decrease the rate of hospital acquired infection.

The selection and the layout of the spray nozzle,which is related to the flow co-efficiency,spray angle and effective range of the spray nozzle,is the primary difficulty in the design of the water spray cooling system.

According to the collocating trait of sphere's spray nozzle, the effective protective measure of area and the total amount of sphere nozzle can be coculated And this paper introduces a way to calculate the water amount in water spray system for single sphere , then ascertains the total water amount for sphere farm.

Exploitation and experimentation of low pressure intermediate flow rate centrifugal water spray nozzle;

The results of the tests show that: water can be used to extinguish EDA fire;the effect gets better when more water is supplied; under the same water supply condition,sprinkling is better than injection;bigger flow coefficient and spray angle of water spray nozzle will contribute to fire suppression.