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The effects of sweep angles of hand-wing, hand-wingin, hand-wingout and arm-wing on lift and drag are analyzed through force measurement experiment. It is obtained that hand-wingin has relatively stronger effect on aerodynamics of swift wing among these segments. The distinct phenomenon of rigid swift wing is its two-time stall in lift curve. Experimental results show that the increase of hand-wing...
Four different solder alloys of Sn-3.5Ag-0.7Cu-xSb (x=0, 0.5, 1.0, and 2.0) were used to investigate the microstructure evolution, grain size distribution of intermetallic compound (IMC), and the relationship between copper atomic diffusion and channel width under different reflow time (t = 48, 240, 3600, and 7200s). Flux-driven ripening (FDR) theoretical model is adopted to analyze the grain ripening...
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