New Page 4 关键词：灰色GM(1，1)模型；双向差分建模；作物产量预测 [gap=448]Key words： the grey model GM(1,1);two direction difference;output of crop forecasting
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The numerical results show that the two linearized difference schemes of the article improve the accuracy of the space and time direction and shorten computation time largely.
数值结果表明，本文建立的两个线性化差分格式提高了时间方向和空间方向的精度，大大缩短了计算机的运行时间。
The alternating direction difference method for the two-dimensional nonlinear delay parabolic differential equation is given.
研究二维非线性延迟抛物型微分方程交替方向差分方法。
The electrode is driven by Elliptical Movement and its direction is controlled by two voltage phase difference.
为实现电火花电极的微米级步距，设计了椭圆微驱动电路，并能有效地控制电极的运动方向。
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