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本文主要讨论了差分方程的概周期解与伪概周期解的存在性。 In this paper, we investigate the existence of almost periodic solutions and pseudo almost periodic solutions for difference equations. | ||
用差分法证明了其周期解的存在性； The existence of periodical solutions is proved by the difference method; | ||
本文讨论渐近线性强迫波方程周期解的存在性。 In this paper we discuss the existence of solution of an asymptotically linear wave equation. | ||
应用第一类完全椭圆积分求出了非线性振动周期的精确解。 The exact solution of the period is got by using the first kind of complete elliptic integral. | ||
将应用叠合度理论的延拓定理建立正周期解存在的充分条件。 Sufficient conditions for the existence of positive periodic solutions are established by applying the continuation theorem of coincidence degree theory. | ||
沙罗周期日数约为朔望月周期（29.53日）、交点月周期（27.21 日）和近点月周期（27.55 日）的最小公倍数。 It is approximately the LCM (lowest common multiple) of the synodic period (29.53 days), draconic period (27.21 days), and the anomalistic period (27.55 days) of the Moon. | ||
当营养输入与毒素输入均为周期变化且有共同周期时讨论了种群的周期共存性。 When both the nutrient and toxicant inputs are periodic functions with the same period, the periodic coexistence of populations has been investigated. | ||
周期地理学是一门介于周期学与地理学之间的边缘科学。 Periodic geography is a borderline science between periodic science and geography. | ||
南交点经过它本命盘位置是另一个与上述周期同时发生的18年周期。 The South Node going over its natal position becomes another 18-year cycle which coincides with the above cycle. | ||
房地产周期的骤然转变事关重大。 A sharp turn in the property cycle is a serious matter. | ||
