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In the study, the effects of Pd thickness on free air ball, wire elongation/strength on bonding strength and bonding interface of Pd coated copper wire bonding were discussed. It was found that the Pd thickness effects on free air ball, the free air ball will become golf ball when the Pd thickness is thin excessively, then the Pd thickness is not less than 0.47% to the wire diameter, and high tensile...
A Cu-SAPO-34/cordierite catalyst was prepared by in situ hydrothermal synthesis. The morphology and structure of the Cu-SAPO-34/cordierite samples were characterized by X-ray diffraction, scanning electron microscopy, and physical adsorption-desorption analyzer. The removal of NO x from simulated diesel vehicle exhaust gas was carried out using a fixed-bed reactor. The effects of C 3 ...
Taking an urban sewage river in north China as study object, total concentrations and concentrations of different chemical forms of heavy metals in surface sediment samples are determined. The relative enrichment factors and the potential ecological risk index, Hakanson index, are taken to study the pollution status of heavy metals in sediments and assess the potential ecological risk. The results...
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