Objective:To investigate the reasonable airflow organization and exhaust system facilities during the operation of the inspection workshop, and solve the problem of the accumulation of harmful gases such as ozone and nitrogen oxides in the workshop.Methods:In May 2023, computational fluid dynamics (CFD) technology was used to numerically simulate the diffusion of ozone and nitrogen oxides generated by industrial radiographic inspection operations, and the comparative detection method was used to analyze the ozone and nitrogen oxides concentrations before and after the renovation of the ventilation system of the inspection workshop.Results:After the renovation of ventilation system, the average concentration of ozone in the inspection workshop decreased from 0.81 mg/m 3 to 0.03 mg/m 3, and the average concentration of nitrogen oxides decreased from 0.42 mg/m 3 to 0.01 mg/m 3, and the differences were statistically significant ( t=20.51, 10.38, P<0.001) . Conclusion:The ventilation facilities of the inspection workshop are set up in the airflow organization mode of sending up and down the exhaust, and the ventilation pipes are scientifically designed through the calculation of ventilation hydraulic balance, which can effectively control the concentration of harmful gases in the inspection workshop.

Objective:To investigate the reasonable airflow organization and exhaust system facilities during the operation of the inspection workshop, and solve the problem of the accumulation of harmful gases such as ozone and nitrogen oxides in the workshop.Methods:In May 2023, computational fluid dynamics (CFD) technology was used to numerically simulate the diffusion of ozone and nitrogen oxides generated by industrial radiographic inspection operations, and the comparative detection method was used to analyze the ozone and nitrogen oxides concentrations before and after the renovation of the ventilation system of the inspection workshop.Results:After the renovation of ventilation system, the average concentration of ozone in the inspection workshop decreased from 0.81 mg/m 3 to 0.03 mg/m 3, and the average concentration of nitrogen oxides decreased from 0.42 mg/m 3 to 0.01 mg/m 3, and the differences were statistically significant ( t=20.51, 10.38, P<0.001) . Conclusion:The ventilation facilities of the inspection workshop are set up in the airflow organization mode of sending up and down the exhaust, and the ventilation pipes are scientifically designed through the calculation of ventilation hydraulic balance, which can effectively control the concentration of harmful gases in the inspection workshop.

In order to identify the cause for abdominal pain and diarrhea by electronic colonoscopy, one male patient aged 54-year-old took orally polyethylene glycol-electrolyte powder including two bags of agents A and B respectively which were dissolved in 300 ml warm water,and taken 1 time every 20 minutes, for 4 times. Two hours later,many dark red spots with a diameter of 0.5 cm were scattered on both lower limbs which were partly fused into ecchymosis,with clear boundary and not faded after pressing. Meanwhile the patient developed abdominal paroxysmal colic and the pain site was not fixed. The stool,urine routine and kidney function were urgently examined,and their results were normal. The results of colonoscopy showed that the colonic mucosa was widely edematous and there were scattered spotty and patchy mucosal hyperemia,which were remarkable at descending colon and lower segment. It was considered to be abdominal type Henoch-Schonlein purpura which might be related with polyethylene glycol-electrolyte powder. After glucocorticoid and symptomatic treatment,the abdominal pain disappeared and ecchymosis subsided within 15 days.

In order to identify the cause for abdominal pain and diarrhea by electronic colonoscopy, one male patient aged 54-year-old took orally polyethylene glycol-electrolyte powder including two bags of agents A and B respectively which were dissolved in 300 ml warm water,and taken 1 time every 20 minutes, for 4 times. Two hours later,many dark red spots with a diameter of 0.5 cm were scattered on both lower limbs which were partly fused into ecchymosis,with clear boundary and not faded after pressing. Meanwhile the patient developed abdominal paroxysmal colic and the pain site was not fixed. The stool,urine routine and kidney function were urgently examined,and their results were normal. The results of colonoscopy showed that the colonic mucosa was widely edematous and there were scattered spotty and patchy mucosal hyperemia,which were remarkable at descending colon and lower segment. It was considered to be abdominal type Henoch-Schonlein purpura which might be related with polyethylene glycol-electrolyte powder. After glucocorticoid and symptomatic treatment,the abdominal pain disappeared and ecchymosis subsided within 15 days.