The existence of particular solutions for a class of Riccati equations is studied by means of variation of constants and initial integral methods.
从一阶线性微分方程结构特点入手，给出了求其通解的常数变易法的数学原理，并简化了积分因子法。
In this paper, using total differentiation method and variation of constants, we give general solution formula of Bernoulli equation with different methods.
本文使用全微分法和常数变易法，从不同角度给出伯努利方程通解的公式。
A minor variation of the fundamental constants forbids life to appear - we just could not exist.
精细结构常数稍稍有些变动，生命就无法存在——我们就根本无法生存。
A minor variation of the fundamental constants forbids life to appear? We just could not exist.
精细结构常数稍稍有些变动，生命就无法存在——我们就根本无法生存。
Moreover, with the increase of the working frequency, the dielectric constants of the PST materials decreased, but the Curie temperature and temperature coefficient basically had no variation.
随着测试频率的增加，测得的材料介电常数略有下降，而居里温度与温度系数基本维持不变。
It is found that the waveguide layer contains uniformly distributed three dimensional strains and the variation of lattice constants in the waveguide depends closely on the waveguide orientation.
结果表明，波导层内含有均匀分布的三维应变场，晶格常数的变化随着波导取向的不同而呈现各向异性特点。
It is found that the waveguide layer contains uniformly distributed three dimensional strains and the variation of lattice constants in the waveguide depends closely on the waveguide orientation.
结果表明，波导层内含有均匀分布的三维应变场，晶格常数的变化随着波导取向的不同而呈现各向异性特点。
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