The application of time weighted average concentration for the dust monitoring in coalpit; 广泛基础加权平均条款适用于所有以往发行的股票及当时进行发行的股票。
According to the data of sample, the time weighted average concentration ( TWA ) of each sampling spot were calculated. 根据测定的数值计算出每个测尘点的时间加权平均(TWA)浓度(TWA)。
On the Relationship between Environmental Instantaneous Concentration and Time Weighted Average(TWA) Concentration of Silica Dust in Workplaces 生产场所矽尘环境瞬时浓度与时间加权平均(TWA)浓度关系的研究
Objective To study the relationship between the environmental instantaneous concentration ( EIC ) and time weighted average concentration ( TWA ) of silica dust in workplaces. [目的]探讨生产场所矽尘环境瞬时浓度(EIC)与其时间加权平均(TWA)浓度(TWA)间的关系。
Methods Personal benzene exposure was sampled with 3M organic vapor monitors. The time weighted average concentration ( 8h-TWA ) and the cumulative dose were calculated. 方法用3M有机气体被动式采样器监测个体接苯浓度,计算8小时时间加权平均(TWA)浓度(8hTWA)和累积接苯浓度。