power-control ratio

Moreover, it can transmit data at a high speed in the frequency selective fading channel. However, one problem of OFDM lies in the big Peak-to-Average Power Ratio ( PAPR), which leads to intermodulation distortion of OFDM signals and degradation of systematic functions.

然而，OFDM系统中最主要的问题之一在于OFDM信号的峰值平均功率比（PAPR）很大，容易导致OFDM信号的交调失真和系统性能的下降，这就限制了OFDM技术的广泛应用。

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The main concern of the study has been the assessment of the spacial distribution of the tritium breeding ratio, the plutonium breeding ratio, and the power density in multi-dimensional configuration and the comparison between One-, two-, three-dimensional global calculation.

重点分析了多维几何中造氚率、造钚率及功率密度的空间分布，比较了一维、二维和三维积分量的计算结果。

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With the minimum frictional power loss and the maximum "the minimum oil film thickness" as the optimum objectives, the marine stern tube bearing is optimized by adjusting the length to diameter ratio, the clearance ratio and the altitude angle ratio.

并分别以功耗最小、最小油膜厚度最大为优化目标，通过改变长径比、间隙比、偏角比对尾管轴承进行了优化设计。

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High solid exterior wall latex coatings are prepared of acrylate emulsion, rutile titanium pigment and micro ground chalk, resulting in lower condensing ratio after dry and higher hiding power.

采用丙烯酸酯乳液做分散介质与金红石型钛白粉和超细重钙粉等配制的高固含量外墙乳胶漆，降低了涂料干燥后的收缩率，提高了涂料的遮盖力等。

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The power factor ( pf ) is the ratio of average power to apparent power.

功率因数 是有功功率与视在功率之比.

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Based on the model, the paper studies how to design wind turbine controller, enables the system operating in the vicinity of the maximum power point, when the wind speed below the rated wind speed. That is the tip speed ratio lies in the optimal value.

在建立的模型基础上，研究了当风速在额定风速以下时，如何设计控制器使得风力机运行在最大功率点附近，也就是说将叶尖速比控制在最佳值。

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This paper proposes a weighted feature reduction method based on Fisher' discriminant ratio ( FDR) for a time-shift invariant feature, power spectrum, in radar automatic target recognition using the high-resolution range profile ( HRRP).

针对雷达高分辨距离像的平移不变特征&功率谱特征，提出了一种基于Fisher判决率的加权特征压缩方法。

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Under the optimum condition that the solid/ liquid ratio was 1 ∶ 10 ( 5.0? g modified Al_2O_3 mixed with 50? mL BF-BR 150% solution), microwave power was 400? W, and the time of the irradiation was 5?

优化了处理工艺条件，实验在固液质量比为1∶10（50mL雅格素蓝BF BR水溶液中投加50g改性氧化铝）、微波功率为400W的条件下微波辐照处理5min。

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The relationship between the generator output power and thermoelectric leg aspect ratio is derived. The matching relationship between the load resistance and aspect ratio, and which between the external thermal resistance and aspect ratio are obtained respectively.

导出了发电器输出功率与电偶臂面长比的关系式，获得了负载电阻及外部热阻两者分别与面长比的匹配关系。

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The optimal relations between power and isentropic temperature ratio exponent, and between efficiency and isentropic temperature ratio expo-nent are derived, by which the optimal relation curve between power and efficiency can be obtained.

导出最佳效率时的功率与等熵温比指数、效率与等熵温比指数的关系式，以及最佳面积比，进而得到最佳效率与功率关系。

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