critical frequency

Silicon carbide ( SiC), which has large band gaps, high critical breakdown field strength, high electron mobility and good thermal conductivity, is considered as an ideal material to manufacture the optoelectronic integrated device with high temperature, high frequency, high power and radioresistance.

SiC以其特有的大禁带宽度、高临界击穿场强、高电子迁移率、高热导率等特点，成为制造高温、高频、大功率、抗辐照及光电集成器件的理想材料。

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No matter the boundary layer is subsonic or supersonic, nonparallel effects are obvious at the critical Reynolds number, such that the critical Reynolds number is reduced and the frequency range of unstable disturbances is broadened at the critical Reynolds number.

无论是在亚音速还是超音速边界层中，非平行性的影响在临界雷诺数处比较明显，具体是一使得临界雷诺数变小，二使得临界雷诺数处增长扰动的频率范围变得更大。

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The results show that, for the case of detuning, both the second threshold and the critical frequency are always increased with the increasing of the detuning parameter.

结果表明，在失谐情形下，第二阈值和临界自脉冲频率都随失谐参量的增大而增大。

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This article describes the mechanism of electromagnetic waves propagation in the thermosphere, the critical frequency and peak height of each layer will be predicted. Ionospheric absorption loss characteristics and ionospheric echoes of high frequency surface wave radar will be discussed.

本文介绍了电磁波的电离层传播机理，预测了电离层每一层穿透频率特性和峰值高度特性，分析了电离层吸收损耗特性。

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Proper extrusion force is critical to ensure weld strength of the spiral weld tube during hi-frequency butt-welding process.

在高频对接螺旋焊管生产中，适当大小的挤压力是保证焊管焊缝强度的关键因素之一。

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Variations of the ionospheric F2 layer critical frequency at Zhongshan Station, Antarctica

南极中山站电离层F2层临界频率变化特征

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The frequency synthesizer is the critical part of the transceiver, because it could meet the high requirement for the frequency stability, spectrum purity, frequency range and the number of output frequencies.

而频率合成器是射频收发机中的关键部分，它能满足对频率稳定度、频谱纯度、频率范围和输出频率个数等的较高要求。

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Traditional capillary theory can explain the issue of maximum absorption coefficient for nonwovens. About critical frequency issue, the theory of membrane vibration can obtain an anastomotic result.

传统的多孔材料毛细管吸声理论基本可以解释非织造布样品吸声系数的问题，应用膜振动理论来解释吸声频率的问题，也得到了较为吻合的结果。

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The SEMI-FREQUENCY vibration between the first critical speed and the stability threshold speed of a rotor system supported on multi-wedge bearings

多油楔轴承支承的转子系统在临界转速与失稳转速之间的半频振动轴系半频扭转共振现象的实验研究

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What are the current critical technical difficulties for radio frequency circuit developing?

目前射频电路开发的主要技术难点是 什么 ?

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Absolute adverbs whose number is not big, but use frequency is high, play a critical role in passing information and expressing emotions.

绝对程度副词虽为数不多但使用频率殊高，在传递信息和表达感情方面有着举足轻重的地位。

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When the frequency is small, the amplitude has an obvious effect on the critical aspect ratio.

裂面形貌扰动频率越小, 振幅对裂腔分节临界形态比的影响越显著.

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Doctored photographs are appearing with a growing frequency in magazines, critical photo evidence in courtroom, insurance claims, science discovery and security surveillance applications.

在现在，伪造图像越来越多的出现在媒体杂志、法庭证物、保险索赔、科学发现以及安全监督等应用中。

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Limit values of critical points were drew up respectively. The objects, methods and frequency of inspection as well as responsible personnel and measures of correcting errors were prescribed clearly.

对关键控制点分别制定适宜监控的关键限值，明确规定监控的对象、方法、频率和实施者以及纠偏措施。

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