谐振

First, a model of transformer has been built and analysed to formulate the expression of pulse on the load capacitor, which can demonstrate the influence of major parameters of transfomer on the charging time and efficiency of energy-transmitting. The influence of output pulse when the resistor of circuit is being took into account also has been analysed by the means of circuit simulation and approximate solution of circuit equation. The efficiency of energy-transmitting under dual nonresonant condition has been analysed and the parameters of transformer has been decided.

首先，对空心变压器的理论模型进行了分析，在得到了输出脉冲电压的表达式的基础上分析了变压器各主要参数对脉冲充电时间和充电时能量传输效率的影响；同时还通过近似求解状态方程的方法对考虑线路电阻时输出脉冲受到的影响进行了分析；讨论了在非双谐振情况下的能量传输效率的问题。

In this paper the simplified equations for computing the complex permittivity is gained by detailed analyses of the resonant-cavity perturbational theory.

谐振腔微扰法特别适合对微小体积样品的测试，很好解决了生物组织样品取样数量有限的问题。

In 1959 Sauerbrey developed an empirical equation to describe the mass sensitivity of gas phase mass deposition on a piezoelectric quartz crystal——Sauerbrey equation:ΔF=〓=-CΔm, where ΔF is measured frequency shift, in Hz; F〓 is the fundamental resonant frequency, in Hz;Δm is mass change, in g; A is piezoelectrically active area , in cm〓;μ〓 is shear modulus of quartz, 2. 947×10〓g· cm〓;ρ〓 is density of quartz, 2. 648g·cm〓; C is mass sensitivity constant , in 〓.

1959年，Sauerbrey最先提出了将压电晶体谐振器用作定量测量质量的装置，并从理论上导出了频率与质量变化之间的关系式——Sauerbrey方程：ΔF=〓=-。。。

This two pronged test approach was used to decouple the programming and debug of the Control Board from the Power Train of the prototype so as to avoid damaging the expensive IGBTs and power resonant elements.

这二种测试法都被用来从样机的传动系分离控制板的编程和调试，以使价格昂贵的IGBTs和动力谐振元件避免受损。

The paper studies a quadrifilar helix antenna with good radiation property and proposes a new one.It has four feed ports and the phase difference between two borders upon ports is 90 degree.

K ilgus在1968年提出的谐振式四臂螺旋天线[1]具有一些引人注目的特点，该天线通过选择适当的物理尺寸以及馈电方式可以形成不同的辐射方向图；此外它还具有重量轻、尺寸小、不需要参考地的优点。

A segregative filter is adopted. Firstly, work out the filter parameter on the condition that ensures the stability.of the filter.Then modify the configuration and parameter on the idea of the controllability damp resonance.

采用一种分离式的滤波器设计方式，即先根据使逆变电源稳定工作LC滤波器的条件确定滤波器的参数，再根据分离式谐振阻尼LC滤波器的思想重新修正滤波器的结构和参数。

Taking zero-current switching quasi-resonant SEPIC power converter as controlled object, this dissertation designs an on-line adjustable modification factor α PID controller.

针对零电流开关准谐振 SEPIC 功率变换器为控制对象，设计了一种α因子在线自调整模糊 PID 控制器。

Setting zero-current switching quasi-resonant SEPIC converter as example, it analyzing the switching mode of SEPIC converter in detail based on the instance of switches' on-off.

以零 电流开关准谐振 SEPIC 变换器为例，根据开关管的通断情况，详细分析了 SEPIC 变换器的开关模态。

The case of a harmonic oscillator driven by sinusoidally varying force is an extremely important one in many branches.

在许多领域中受正弦变化力策动的谐振子是一种十分重要的运动。

A microring and a phase modulator are coupled to each arm of a normal Mach-Zehnder modulator respectively in order to compensate its sublinear characteristics transfer.

将一个微环谐振器和一个相位调制器分别加载到马赫曾德尔调制器的两臂，可以补偿普通马赫曾德尔调制器的亚线性，得到线性度良好的响应特性。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。