The object of research is the amplitude-frequency characteristic sound insulation multi-layer heterogeneous structures. One most problematic places calculation methodology, due to existence standards such as ISO, DBN, which have some differences between them, and software, methodology not fully known, copyright latter. Using modeling method in INSUL software complex, characteristics partition w...

The environmental pollution problem of Sinochem Chongqing Fuling Chemical Co., Ltd. is serious. District Party committee and government relocated the chemical plant as a whole started ecological restoration project. However, investigation found that soil covering greening failed to fundamentally eliminate harm caused by phosphorus slag environment. Therefore, resource utilization imperative. ap...

Oil-impregnated paper is widely used in power transmission equipment as a reliable insulation. However, copper sulphide deposition on oil-paper insulation can lead to insulation failures in power transformers. This paper presents the influences of copper sulfur corrosion and copper sulphide deposition on copper wires and oil-paper insulation in power transformers. Thermal aging tests of paper-w...