Comparison study for lightning rod and lightning eliminator
Abstract The method of measuring corona current and ground field from lightning eliminator with multiple conductor points and lightning rod is given. The results of the measurement are reported. We can find that the corona current of lightning eliminator is basically equal to that of lightning rod, and either of them is smaller than 70 μA . This result shows that the lightning eliminator cannot provide electrification ions enough to neutralize the charges in thunderclouds, so the lightning eliminator cannot have the role of eliminating lightning. In other words, the characteristic of protecting lightning of the lightning eliminator is basically equal to that of lightning rod. The properties of ground field in the course of lightning are reported that can be helpful to understand the feature of lightning.
Objective To evaluate the effect of the post-processing mode of sewage treatment in two rural areas of Shengzhou and to provide scientific basis for rural toilets renovation.Methods Ten sanitary toilets of three cesspools and four cesspools for each were random selected.The basic situation,routine monitoring and pollutant items were evaluated.Results Routine monitoring items basically reached the sanitary standards and ammonia,COD,BOD5 qualified rate is low.The results of ammonia,phosphorus,COD,BOD5 in three cesspool sanitary toilets significantly better than that of four cesspool sanitary toilets.Conclusion Part of hygiene and pollution item removal rate and qualified rate are low.Harmlessness effect of tree cesspool toilets is better than four cesspool toilets.It is necessary to strengthen design,technical guidance and check in construction of rural toilets.