双变换式(double conversion)：所谓双变换，是指交流经过AC/DC整流成直流再经过逆变器DC/AC变换成交流给负载，因为经过了中间直流环节，所以更全面地解决电源...
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双变换真在线式技术 On-line double conversion technology
双吸收式热变换器 double absorption heat transformers ; DAHT
洛伦兹变换的双曲形式 [物] hyperbolic form of Lorentz transformation
双正交叠式变换 lapped biorthogonal transform
介绍基于双正交整数叠式变换（LBT） 的图像压缩及编码方法的原理，以及该系统的硬件设计。
The paper introduced the method to realize the image compression based on Integer Lapped Biorthogonal Transform(LBT) and the theory of coding as well as its hardware design.
该静止变流器前级采用推挽正激式变换器，后级采用双降压式逆变器。
The first stage is push pull forward converter, and the second stage is a dual buck inverter(DBI).
利用辛变换条件得到了一些新的切比雪夫多项式公式、三角恒等式和双曲恒等式。
In this paper by using the symplectic transformation condition, some new formulas including Chebyshev Polynomial, trigonometric identity, hyperbolic identity were obtained.
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