频率

According to the preliminary result, the number of the subharmonic is chosen as 8, while the frequency of local oscillator is chosen as 15-20GHz.

然后根据已知的频率范围，将本振频率选择为15-20GHz，则谐波混频的谐波次数确定为8。

A suboptimum detection algorithm based on the frequency domain equalization was developed and the soft output iterative FDE algorithm JI-FDE was studied.

为了降低OVSC检测的复杂度，提出了基于频率域均衡的次优算法J-FDE，进一步研究了软输出迭代频率域均衡算法-JI-FDE。

Except for the Ningxia Tan sheep and Suffolk , all breeds were in accordance with the Hardy-Weinberg equilibrium.

经χ2检验后，除滩羊和萨福克羊外，其他群体的基因频率和基因型频率均处于Hardy-Weinberg平衡状态。

Radio engineers already had a fairly good understanding of how the sunspot cycle affected lower frequency transmissions, especially at frequencies below 30 MHz.

无线电工程师已经有相当好理解对怎样黑点周期影响了更低的频率传输，特别是以频率在30 兆赫以下。

If the excitation amplitude is constant and the excitation frequency is close to 3-times resonance frequency, the effect of the 3-times superharmonic resonance on the system response increases greatly.

当激励幅值不变、激励频率逐渐接近3倍超谐共振频率点时，3倍超谐振动成分对系统响应的影响逐渐增加，这表明立方非线性对系统的调节作用越来越强。

The simulation is carried out with the excitation frequency relative to the natural vortex-shedding frequency from the corresponding stationary cylinder taking values in the range which stands for sub- and superharmonic excitation and the oscillation dimensionless amplitudes. Change of these parameters and Reynolds number will lead to the mode synchronization and mode competition and the switching between different vortex shedding modes.

对振动频率和静止圆柱旋涡脱落频率比在一定的超谐和亚谐范围、一定的无量纲振幅范围和不同的雷诺数都作了模拟，发现随这些参数变化将产生旋涡脱落模式的同步、竞争和相互转化现象。

Due to the regulating by the cubnonlinearities, some parametric ranges in which 3-times superharmonic vibration or 1/3-times subharmonic vibration arises exist in the sytem. When the excitation frequency approaching 3-times or 1/3-times resonance frequency, the system response is stable and periodic .This fact shows that regulating action of the cubic nonlinearities on the vibration system is strong.

由于立方非线性对达芬系统的调节，系统存在出现3次超谐共振和1/3亚谐共振的参数域，在激振频率接近3倍或1/3倍派生系统的固有频率时，立方非线性对系统的调节作用越来越强，从而使动态响应成为稳定的周期性。

The microwave absorbing performance of frequency selective surface with resistance patch was analyzed in this paper.

1引言频率选择表面是二维周期性导体贴片或孔径单元阵列，具有带阻或带通的滤波特性，其频率滤波特性来自它的周期性结构与电磁波的相互作用。

Measure character: Frequency limits: CH1:dResolution of C ～ 225MHz frequency: 10 / second time-interval resolution : N/A measures speed: Can amount to 200 times measure / the second mixes in limits of the voltage on GPIB sensitivity : DC ～ 100MHz: 200MHz of ～ of 5Vac+dc 100MHz of 20mVrms ～±: 225MHz of ～ of 5Vac+dc 200MHz of 30mVrms ～±: Input of 5Vac+dc of 40mVrms ～± adjusts:(CH1 chooses) impedance, coupling: 1M Ω or 50 Ω, ac or Dc are low connect filter: 100kHz, but switch attenuation:× 1 or reference of × 10 exterior time base inputs: 1, 5, 10MHz sparks: CH1, to rising / drop the edge sparks, the percentage that uses signal n or absolutely voltage install n, setting sensitivity mixes to low, medium or tall gate start: Automatic, the hand is moved (setting gate time or resolution digit); Exterior, defer interface: Standard GP-IB(IEEE 488.1 and 488.2), take; of SCPI compatible language to say RS-232 power source only: 10 ％ of 100-120VAC ±, 50, 60 or 10 ％ of 400Hz ± 10 ％ of 220-240VAC ±, 50 or 10 ％ of 60Hz ± are suttle: 3kg dimension: 348.3mm of × of 212.6 × 88.5H

测量特征：频率规模：CH1：dc～225MHz 频率分辨率：10位/秒时候距离分辨率：N/A 测量速度：可达200次测量/秒在GPIB上电压规模和灵敏度： DC～100MHz： 20mVrms～±5Vac+dc 100MHz～200MHz：30mVrms～±5Vac+dc 200MHz～225MHz：40mVrms～±5Vac+dc 输入调节：(CH1选择)阻抗，耦合： 1MΩ或50Ω，ac或dc 低通滤波器： 100kHz，可切换衰减：×1或×10 外部时基参考输入： 1，5，10MHz 触发： CH1，对回升/回升沿触发，用信号电平的百分数或相对电压设置电平，设置灵敏度至低、中或高闸门和启动：主动，手动(设置闸门时候或分辨率位数)；外部，延迟接口：尺度GP-IB(IEEE 488.1和488.2)，带SCPI兼容说话；只讲RS-232 电源：100-120VAC±10％，50，60或400Hz±10％ 220-240VAC±10％，50或60Hz±10％净重：3kg 尺寸：212.6×88.5×348.3mm

Consumption frequencies of fresh vegetable, fruit, milk and milk product, preserved food and sweetmeat were variable in different provinces. The consumption frequencies of fruit, bean product, preserved food and sweetmeat were variable in different age groups.

安徽项目地区的农民在新鲜蔬菜、豆制品、乳及乳制品、腌熏食品、油炸食品和甜食的摄入频度均高于新疆；2省在新鲜蔬菜、水果、乳及乳制品、腌熏食品和甜食的摄入有差异；水果和乳制品的食用频率随年龄增加而减少，豆制品和腌熏食品的食用频率随年龄增加而增加；水果、豆制品、腌熏食品和甜食的摄入各年龄组差异有统计学意义，P.05。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。