载频

Then, the two-dimensional point target spectrum is derived by the method of series reversion.

结合级数反演法，得到了弹载 SAR 回波信号的 2 维频域的精确表达式。

To measure the satellite oscillator frequency accurately is of great significance for transmitting time and frequency information by satellite,and the difficult point of the measurement is to deal with the Doppler frequency shift.

星载振荡器频率的测量对利用通信卫星进行标准时间和频率传递有重要的意义，测量的难点是多普勒频移的处理。

Results based on experiment and measurement data indicate that, when 244 nm argon ion laser emits 40 mW UV light, the curve of refractive index changes in single mode hydrogen loading fiber is exponential type (Ac=1.632×10-6 t 0.76912), exponential growth is obvious in the beginning, a very good linear region is following, and then refractive index increments reach saturated.

结果表明， 244 nm氩离子倍频激光器输出光功率为40 mW时，普通载氢光纤光致折射率变化量随曝光时间总体上呈现指数分布关系Ac=1.632×10-6 t 0.76912；在曝光时间较短时，造成的光栅强度较弱，光致折射率变化量有明显的指数增长趋势，之后是一段较好的线性区域，这时两个测量模型的结果得到了很好的印证，随着曝光时间的继续增加，光致折射率变化量达到饱和。

The nonlinear crosstalk due to cross-phase modulation was studied by a new analysis model in single-sideband radio over fiber systems, and the results were compared with that of the pump-probe method,which could be used to analyze different links, in particular, electrooptical upconversion links.

利用非线性薛定谔方程，推导计算了基于光学单边带调制的光载射频链路中交叉相位调制引起的非线性串扰，建立了新的分析模型，并和抽运探测法进行了比较。

In order to analyze the dynamic of a turret-moored tan ker, a perturbation method was used to predict the RAO and the spectra of moti on and mooring line tension under the irregular wave condition.

为研究转塔式系泊储油轮的动力响应，应用二阶频域摄动理论计算了其在压载状态下的一阶运动响应、二阶运动的响应谱及锚泊线张力谱，并与相应的模型试验结果进行了比较。

Firstly, achieving a new low and high cycle noninterfering loading, the high frequency induction local heating, the control of high cycle vibration frequency and amplitude, and the crack propagation real-time detection, an experimental system of L-HCCF at elevated temperature is established. Secondly, under two vibration frequency (50Hz and 100Hz), the contrast experiment of light and serious corrosion disc slots is done. It is found that the experimental L-HCCF life of serious corrosion disc is less than that of light's, but its dispersion is larger, and the experimental failure is identical with the service's.

首先，进行大量试验工作，提出了高低周疲劳载荷的新型加载方案，并解决了高频感应局部加温、振动调频及裂纹实时监测等多个技术难点，建立了涡轮盘全尺寸高温复合疲劳试验系统；验证试验做到了故障再现；接着进行了两种频比（振频50HZ与100HZ）的轻、重腐蚀盘的对比试验；由对榫槽第一齿进行裂纹实时跟踪，得出了枞树型榫槽的复合疲劳裂纹扩展特点规律；对榫齿断口进行的金相分析表明：裂纹首先由第一齿开始，断口系复合疲劳；试验结果显示：重腐蚀盘试验寿命较轻腐蚀盘有显著的下降，而且分散性较大。

Compound semiconductor devices are key parts of RF communication applications because they have advantages of high electron mobility, high working frequency, low RF loss, high linearity and low noise. It is so-called "pHEMT" for full name "Pseudomorphic High Electron Mobility Transistor".

中文摘要Ⅲ-Ⅴ族化合物半导体材料所制成之元件，具有高载子迁移率、工作频率高、射频损耗低、高线性度、低杂讯等优势，使得Ⅲ-Ⅴ族化合物半导体元件成为现今射频通讯应用之关键部份。pHEMT为假晶高电子迁移率电晶体之简称。

The effect of superstrate on characteristics of dual-band microstrip antennas with bilithic reactive loading is studied firstly.

首次研究了多层介质覆盖对电感加载双频微带天线特性的影响，得到一些有意义的结论。

So we should consider choosing the way to design it according to a variety of factors.A NLTL frequency tripler in Ka-band are designed by loading eleven varactors in a high impedance microstrip line in the thesis.

本文利用高阻抗微带线加载11个变容二极管实现了非线性传输线八毫米三倍频器，该倍频器的缺点就是管子太多，不利于小型化。

According to the characteristics of field dis tribution, a method to abstract quadrature component and amplitude of vertical magnetic field in near-field zone is proposed. Based on the dual-fre. quency combi nation wave theory, apparent resistivities with various forms at center and any point in near-field zone of current loop on stratified earth are defined.

根据场分布的特征，提出了在近区提取磁场垂直分量的正交部分和磁场垂直分量的振幅作为研究对象的方案；根据双频组合波理论，利用它们所对应的双频差，给出了载流回线中心点和近区任意点的视电阻率不同形式的表达式。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。