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An engineered Streptomyces lydicus strain with 6-phosphofructokinase gene (pfkA1) over-expression was constructed by recombinant DNA technology. Biomass, pH value, glucose and streptolydigin concentrations were measured and the fermentation kinetics were calculated. The cell growth and glucose consumption of the engineered strain was faster in the early period, and then slow down in the later stage...
To study the interface stress of 63Sn37Pb under the temperature cycle condition in the QFP package. Viscoplastic finite element model is established based on the Anand constitutive equation. These factors are discussed in this paper, and these influent factors of the interface stress are between 63Sn37Pb weld spot and backing. The results show that the loading rate have very large effect on the interface...
Under the condition of uniaxial strain(Amplitude is plusmn0.025%), the elastic-plastic finite element method was used to analyze the bonding of conductive/copper wire. The result shows that the plastic strain of X and Y direction is mainly occurred at two positions: one is at the left arc side; the other is at the right arc side of the department. The maximum value of the von Mises equivalent stress...
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