...

<正> Chaos is universal phenomenon in the nature. Some scientists think that chaos theory is the third revolution in phy......

<正> Delta Scuti stars are variables of spectral types A to F with a pulsation period less than 0.3 days and light varia......

热超短周期造父变星的周期≤0.~d1、变幅≥0.~m2、光谱型为A.在银河系中呈延仲球状分布;在银晕星族的球状星团和年老盘族的运动星......