以下为句子列表：
英文: A good rule of thumb is if the propagation delay of the data line is much less than one bit width, termination is not needed.
中文: 一个好经验法则是：如果数据线的传播延迟远小于一个位宽度时,就不必使用终端电阻。
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英文: A theoretical investigation by split-step Fourier method is presented on the propagation of a femtosecond Gauss pulse in photonic crystal fibers.
中文: 摘要运用分步傅里叶方法数值模拟了飞秒高斯脉冲在光子晶体光纤中的传输，计算分析了初始啁啾对脉冲压缩效应的影响。
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英文: A three-tiered artificial neural network (ANN) model with a feed-forward, back-propagation net-work structure was developed to forecast river flow in the Manwan Reservoir.
中文: 摘要以云南省漫湾水电站历史径流状况为研究对象，运用三层前馈反向传播神经网络模型对径流进行中长期预报。
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英文: A two-dimensional plain strain finite element model of infinite plate is developed to investigate the ultrasonic wave propagation and scattering on three kinds of cracks: parallel to the surface, 450 oblique angle to the surface, and quarter-circle.
中文: 摘要建立了无限长板的具有吸收边界的二维平面应变有限元模型，在研究了脉冲超声波在无限长板中传播的基础上，对板中平行于表面的裂纹、与表面成45°的斜裂纹和四分之一圆周弧形裂纹三种情况的脉冲超声波散射进行了重点研究。
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英文: Abstract: A general BPM simulator for optical waveguides is presented in this paper.This system includes three tools:the effective refractive index calculation tool, the waveguide mode solution tool,and the beam propagation method simulation tool.This sys
中文: 文摘:介绍了一个光波导器件计算机辅助分析系统，该系统集成了3个实用工具：光波导有效折射率计算工具，光波导模式求解工具和三维复折射率全矢量有限差分束传播法模拟工具.本系统用于线性波导器件，模拟光在波导中的传播过程，从而可以优化设计波导器件，探索新结构器件.
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