品质因数

On the respect of piezoelectric properties, Mn coexisted as Mn〓 and Mn〓 in PZNPZT system and suitable Mn doping as acceptor improved Q〓 and lowed tan δ greatly, meanwhile, high density assured K〓 out of decrease.

适量的锰掺杂使PZN-PZT体系的机械品质因数Q〓上升和介电损耗tan δ下降，同时瓷体较高的致密度又保证了机电耦合系数K〓不致降低。

In order to make the microstrip equalizer matchs the given attenuation curve respectively ,it should be attenuation adjustable and quality factor adjustable besides frequency adjustable.

摘要为了使微带均衡器满足衰减特性与给定的误差曲线逐点拟和的要求，就必须使其频率可调、衰减可调、品质因数可调。

With internationally latest studies, the paper also proposes some biquadrate filters which are capable to perform the functions of second-order low pass、 high pass、 band pass、 band stop、 all pass filtering by selecting one of the three inputs or their proper combinations from the same configuration, furthermore whose natural frequency and the quality factor can be tuned independently. Then a continuous-time biquadratic filter using CCCII is proposed, which can be used in hearing aids and in other analog signal processing applications. Lastly a current mode and a voltage mode novel n-order filters of multifunction are presented. Not all both of the n-order filters are electronic tunable,but also they are integrated conveniently and compatible with VLSI technology.

尽量的全面归纳以电流控制传送器为有源器件的有源网络模拟电路、模拟信号处理电路，借鉴国内外最新研究成果，提出两种基于CCCⅡ的双二阶滤波器，这些电路在不需要改变电路结构的情况下，能同时实现低通、高通、带通、带阻或全通多种滤波功能，并且滤波器的特征频率ω_0和品质因数Q可实现独立调节；其中一种基于CCCⅡ的双二阶滤波器，首次提出将CCCⅡ应用于可编程助听器领域；最后设计了两种高阶滤波器，电压模式和电流模式各一种，这两种滤波电路均能实现多种滤波功能，能实现滤波器参数的电调谐，具有易于集成等优点。

A new digital method based on FPGA was introduced in this paper to amplify the quality factor of micro cantilever.

本文提出一种基于FPGA的数字式提高微悬臂梁品质因数的方法。

The conventional swept frequency method for measuring quality factor of a cavity resonator is limited in practical use.

传统的谐振腔品质因数扫频测量方法在实际测量时存在一定的限制。

Quality factor ; cavity resonator ; microwave measurement ; bandwidth of half power

品质因数；谐振腔；微波测量；半功率带宽

Quality factor control technique can control the force sensitivity and imaging resolution by precise adjustment of the microcantilever's quality factor.

在分析品质因数调控技术机理的基础上，分别在一般轻敲模式下和有品质因数调控电路支持的轻敲模式下，利用琼脂糖凝胶作为样品，测得力曲线。

In liquid, the low quality factor of the microcantilever in tapping mode limits the force sensitivity and imaging resolution of atomic force microscopy.

液体中轻敲模式下微悬臂梁的低品质因数会限制原子力显微镜的力灵敏度和成像分辨率，品质因数调控技术可以提高品质因数。

Thermal effect would change resonant Q-factor, and influence laser stability and output beam quality.

输出窗的热效应改变了CO2激光器谐振腔的品质因数，影响激光器的稳定性和输出光束的品质。

Chapter 3 gives the theoretical analyses to Q-factor of electromagetic open resonator due to the mirror loss、mirror diffraction loss、coupling aperture loss and inserted dielectric specimen loss in detail by means of the incremental frequency rule and the small aperture coupling theory, and obtains the more precise formulae for calculating Q-factor.

在第三章利用电磁开腔的复数源点理论以及频率增量法和小孔耦合理论，分别对电磁开腔镜面反射损耗、镜面衍射损耗、耦合孔损耗以及介质样品损耗引起的品质因数进行了深入的理论分析，得到了电磁开腔品质因数更为精确的计算公式。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。