高频

At the same time, the dielectric properties of good sintered body were measured and analyzed.

并对烧结良好的烧结体的高频介电性能进行了测量和分析。

The circuit topology of the differential Forward DC-DC converter mode inverter with high frequency link was proposed. Circuit topology, transient voltage control strategy, steady principle characteristic and design criteria for the key circuit parameters were deeply investigated.

提出差动正激直流变换器型高频环节逆变器电路拓扑，并对该变换器的电路拓扑、瞬时电压控制策略、稳态原理特性、关键电路参数设计准则等进行了深入地分析研究。

The cutoff frequency is 264 MHz. OTA (Operational Transconductance Amplifier) is realized in pseudo differential topology to maximize the linearity of the filter. Architecture of transconductance enhanced source degeneration is adopted for the VGA to control the gain, together with a source degeneration capacitance to widen the bandwidth.

滤波器采用5阶Chebyshev近似、GC biquad结构，转折频率为264 MHz，OTA采用伪差分结构以提高滤波器的线性度；VGA采用跨导增强型源级负反馈结构来控制增益，并加入源级负反馈电容进行高频补偿以拓展带宽。

The digital control technology of high frequency UPS System is studied in this paper.

本文研究了高频UPS 系统的数字化技术问题。

The validities of amplitude features and their extraction method suitable in high-frequency SAR image are analyzed when they are used in UWB SAR image. An extraction approach of amplitude feature based on target contour is presented, and the corresponding effective amplitude features are proposed. The old dihedral angle model is analyzed and improved. The approach of azimuthal feature extraction is proposed based on the conclusion of the improved dihedral angle model. The problems, which appear when the common change detection methods are used to extract the change feature based on ROI, are analyzed. And a robust and feasible extraction approach is presented.

分析了适于高频SAR图像的幅度特征及其提取方法用于UWB SAR图像时的有效性，提出了基于目标轮廓的幅度特征提取方法及相应的适用幅度特征；分析了已有二面角模型在建模过程中存在的问题并进行了改进建模，基于改进二面角模型结论提出了方位向特征提取方法；分析了常用变化检测方法用于提取ROI变化特征时存在的问题，提出了一种稳健可行的变化特征提取方法。

The high-frequency ultrasound can precisely differentiate IIR from DIR, which is an effective guidance for LIHR.

高频超声能准确鉴别腹股沟斜疝与直疝，有效指导腹腔镜疝修补术。

Now, however, cheaper technology, plus the disaggregation of traditional exchanges, means HFT is exploding.

不过眼下，更为廉价的技术，加上传统交易所的瓦解，意味着高频交易正在泛滥。

The experiment results of the improved and the former charger/discharger are given in the end. The results indicate that the harmonic currents of the improved one have been reduced obviously.

最后，论文通过实验对改进前后充放电器电路的输入电流进行了比较，表明该改进方案对输入电流的低频和高频谐波都有较好的抑制效果。

In addition, the changing of particle distribution in longitudinal phase space during the accelerating process has been obtained.

模拟结果给出了不同时刻粒子在纵向相空间的分布以及各主要高频参数随时间的变化曲线。

Using the spectrum decomposition technique by discrete Fourier transform in short window a-chieves the object using imaging feature of tuning amplitude in frequency domain to study the regularity of lateral variation in reservoir and fully dig up seismic resolution capability in dominant-high frequencies of seismic data.

采用短时窗离散傅里叶变换的频谱分解技术，实现了在频率域内通过调谐振幅的成像特征来研究储层横向变化规律的目标，最大限度地挖掘了地震资料主频至高频端的地震分辨能力。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。