constant feature
3.As the cam profile with constant-velocity-constant-acceleration ramp feature and with continuous higher derivative lift feature is widely adopted in the advanced high-speed internal combustion engines, the cam ramp profile is fitted with a reasonable function and the cam-lift profile is fitted with a polynomial function.
5.Through study on 100 korean pine sample trees less than 14m in virgin korean pine forest , the growth type, relationship between growth and upper structure factors , the morphology feature and physioiogical feature of korean pine under canopy are analyzed. The results show that the growth of korean pine under canopy can be classified to constant type , descend type and ascend type.
6.Abstract: Under reviewing the history and analyzing the present system of Japanese LA education and LA institute, this paper first summarized the present situation of Japanese LA education as the following: internationalization, socialization, distinguishing feature, diversified name, quantitative study in LA, classified in detail in LA, being systematic, constant development and practice.
7.Transitional feature of the arc and metal droplet in the welding process with steam shielded arc is investigated by means of analysing the waveforms of welding voltage and current under different welding regimes and it is found that there are two types of arc process behavor—"arc starting-arc blowing out-short-circuiting" and "arc-starting-short-circuiting".Under the condition of constant diameter of welding wire and its feeding speed,the arc process behavor can be changed by adjusting the inductance of welding circuit as well as the voltage of power supply.If arc process behaves as alternative process of "arc starting-arc blowing out-short-circuiting" with minimum time duration of arc blowing out and maximum frequency of short-circuit transition,the welding process will be stable with less spatter and smooth weld bead.
