频带

It could be concluded that spectral decomposition can reveal geological structures of different size, It is an effective tool for depositional environment and reservoir study.

研究和分析表明：分频解释可以在不同的频带上显示不同级别的地质现象，是地震资料研究沉积环境和储层的有效手段；时频分析是实现地震分频解释的重要手段。

The electromagnetic spring with tooth structure is adopted in this paper to adjust the stiffness of isolator, which make the isolator work with different stiffness in different excited frequencies. So the isolation performance is improved as the resonance frequency is eliminated in a broad band.

本文采用齿形结构的电磁弹簧来改变隔振器的刚度，使隔振器在不同外扰频率下变刚度运行，从而能实现在较宽的频带范围内无共振峰，改善隔振性能。

A satisfactory method of frequency stabilization shall be employed in the transmitting apparatus.

必须装有量度频率及功率的设备，而这些设备必须能够核证发讯仪器所作的发射是在认许的频带及功率限制范围内。

Due to the single microstrip patch antenna is a kind of standing wave antenna, a narrow bandwidth is resulted.

由于单一微带贴片天线是驻波形式的天线，导致了其频带宽度较窄。

Level of serum total cholesterol and triacylglycerol of patients in the plaque group was in a normal range (4.45±0.98),(1.36±0.60) mmol/L superior limit of mon carotid artery of patients with or without plaque in thyroid: Frequent zone was 10 cm/s or so in the wider ones and all with sound window.

有斑块组患者的血清总胆固醇、三酰甘油水平均处于正常范围内[(4.45±0.98)，(1.36±0.60)mmol/L(正常值上限：5.2 mmol/L；2.25 mmol/L)]。③甲状腺段颈总动脉有无斑块患者的频谱参数：频带较宽为10 cm/s左右，都有声窗。

However, synchronisation between independent wireless networks has some drawbacks which result in reduced bandwidth availability.

但是在各个独立的无线网络之间的同步存在一些问题，从而降低了频带宽度的利用率。

The main content of this dissertation includes: 1. Research on the theory of ultrasonic power supply, introduce its development process. On the basis of these, fix on the scheme of medical ultrasonic low-power supply. 2. According to the principle of modularized design, divide medical ultrasonic low-power supply into four parts. They are power amplify circuit, power control circuit, frequency automatic tracking circuit and matching circuit. Separately research on their theories and design their circuits and necessary programs, especially, effectively resolve the problem tracking the supersonic vibration system with a narrow syntony frequency bandwidth and a high swing. 3. The matching experiments gain good result, and prove that medical ultrasonic low-power supply is entirely up to the mustard on intellectualization, wide band of working frequency, steady output and high efficiency.

本文工作的主要内容包括： 1、研究了超声功率电源的原理，并回顾了它的发展过程，在此基础之上确定本文医用小功率超声电源的设计方案； 2、按照模块化的设计原则，将医用小功率超声电源的设计分解为功率放大电路、功率控制电路、频率自动跟踪电路和匹配电路等四个部分，分别研究了各部分的原理，在此基础之上进行了具体的电路设计和程序设计，尤其是有效地解决了对谐振频率带宽窄振幅高的超声振动系统的频率跟踪问题； 3、通过与超声振动系统的各项配合实验，取得了很好的实验结果，验证了医用小功率超声电源完全满足智能化、工作频带宽、输出功率稳定、输出效率高的设计要求。

Since the detected signal isalways limited, according to the uncertainty principle, the frequency band is infinite.

由于观测的心率变异信号总是有限长的，根据不确定原理，所能得到的频带必然是无限的。

RFP will be taken as that delivered to the aerial and generally for the unmodulated condition; but in the case of systems in which the application of modulation

中，如使用调制引致有效载波功率增加(如载波及旁频带重新分配致使功率有任何改变除外)，则增加量无须计算在内。

Making use of field matching method,combining with the variational method,the dispersion equation of the ridge loaded ring plane slow wave structure and small signal gain of this type of TWT are presented in this paper.

脊加载环板行波管是一种频带相对较宽的大功率行波管，本文用场匹配和变分原理相结合的方法，研究了脊加载环板慢波结构的导波特性及这种行波管的小信号、大信号特性，讨论了结构的几何尺寸及电子注参量对慢波的传播特性、小信号增益及注波互作用非线性效应的影响。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。