<正> In his paper On rotated veotor fields and the global behavior of limit cycles of a class of quadratic system in the plane (J. Diff. Eqs., 18(1975), 63—86)
<正> A systemic morphological research of Giant panda including its system anatomy and organohistology was carried out from December 1980 to June 1983. Seven ad
<正> The cytoplasmic polyhedrosis virus (CPV) of silkworm was conveniently purified in large quantities under mild coditions by means of gel column chromatograp
<正> In this letter we shall deal with problems of optimization by using ordinary differential equations. The limit point of the path of the initial value probl
<正> In complexity theory, upper bounds have been improved repeatedly, but little has been obtained in the field of lower bounds.For example, the upper bounds f
<正> P. Erds et al. posed a conjecture in 1966 (P. Erds et al. Canad. J. Math., 18 (1966), 106—112). Ten years later, this conjecture was listed as an unsolved
<正> Rare earth cobalt permanent magnetic alloys are a new generations of permanent magnets developed in the last decade, of which SmCo5 permanent magnets are t
<正> Radiostrontium is one of the most dangerous radionuclides among the nuclear fission products and the fall-out because of its easy absorption by organism an
<正> The authors took simultaneously two timeaverage holograms of the first-order bending vibration of an air compressor blade. There are forty clear interferen