从信息的分布模型，导出了信息的可测条件。
From the model, the measurable condition of information is derived.
推导出了中等稳定顶板条件下计算支护系统所需阻力和可缩量的公式，并进行了相应的模拟实验研究。
The formula of calculation of support system resistance and yieldability under condition of medium stable roof is derived and proved through eguivalent model testing.
在透声界面附近运用声学基本方程可导出边界条件的时域有限差分(FDTD)表达式。
From the basic equations in acoustics, boundary condition expressions on penetrable interfaces between media can be derived for the finite difference time domain (FDTD) method.
基于密度波理论的非线性方程，用定性分析理论可导出旋涡星系的演化方向和由观测可得到的演化条件。
Based on the nonlinear equations of the theory of density wave, the evolutionary direction and the observable conditions on spiral galaxies may be derived by the qualitative analysis theory.
基于密度波理论的非线性方程，用定性分析理论可导出旋涡星系的演化方向和由观测可得到的演化条件。
Based on the nonlinear equations of the theory of density wave, the evolutionary direction and the observable conditions on spiral galaxies may be derived by the qualitative analysis theory.
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