以下为句子列表：
英文: Abstract: Brief introduction to χ(2) cascading nonlinearities is presented.The enhancement mechanisms for optical Kerr effect and the photorefractive effect as χ(2) cascading process are discussed.Mutual inductance between quadric and cubic nonlinearities
中文: 文摘:介绍了χ(2)串级非线性.讨论了串级光克尔非线性和串级光折变非线性的增强机制，并指出二阶和三阶非线性的相互转化，为光学非线性工程设计提供了可行性.
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英文: Mutual inductance is a common problem in ribbon cables, especially when a single return is common to several signal circuits.
中文: 带状电缆普遍存在较强的互感，尤其是当多路信号共用返回路径的时候。
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英文: Reducing the frequency or amplitude of the current causing the interference may be impracticable but it is frequently possible to reduce the mutual inductance between the interfering and interfered with circuits by reducing loop areas on both sides and, p
中文: 一般说来，用降低引发干扰的电流的频率和大小的方法来减少耦合是不容易做到的，但是，如果能减少干扰源电路和被干扰电路各自的环路面积，就可以降低二者之间的互感，同时，还可能增加这些电路的间距。
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英文: The basic principles still apply: ground impedance must be as low as possible, high level and low level signals must be separated so that they do not interfere with each other, and capacitance and mutual inductance coupling must be avoided.
中文: 前文提到的原理仍然适用：地线阻抗要尽量小，大功率信号和微弱信号要分开布置以避免串扰，一定要避免电容性耦合和电场耦合。
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英文: The imperfection mutual inductance will excite spurious frequency, and create circulating currents in each choke capacitor branch, therefore cause magnet current distortion.
中文: 结果表明，谐振电抗器的互感系数的不一致性将激励寄生频率，从而在每个谐振电抗器与电容支路中产生寄生电流，并导致磁铁电流的畸变。
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