The environmental and economic factors affecting the space component and the time coefficient are sieved by stepwise regression, and factor structure models are established.
用逐步回归方法筛选影响空间分量和时间系数的环境和经济因子，组建因子结构模型。
Based on the above, the impact of amplitude coefficient ratio on amplitude-phase Double Differential Space-Time Codes is discussed, and an optimal selection scheme in amplitude coefficient is given.
在此基础上，讨论了幅度系数比对幅度相位双差分空时码的影响，并给出了一种最佳的幅度系数选择方案。
The life prediction model under chloride ion environment was set up in considering differences in space and time-dependent of the chloride ion diffusion coefficient.
建立了考虑氯离子扩散系数空间差异性和时间依赖性的基于可靠度的寿命预测模型。
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