If the speaker needs more current ( its overall impedance drops ) then a lower amplifier output impedance will allow that current to be drawn out of the amplifier without causing much of a change in the applied voltage - and that means [ i ] less [ / i ] distortion 如果扬声器需要更大电流(扬声器的整体阻抗降低) ,那么一个低输出阻抗的放大器可以容许在输出相应电流的同时,所施加的电压变化更小,这也意味着失真更小。
The numerical results show that an appropriate applied voltage potential across the piezoelectric shell has the effect of suppressing the reflected pressure from the sphere shell in a cone fluid field , and able to completely cancel the reflections at any chosen field points 研究表明,在压电中加载适当的电压可以在一个圆锥形的流体区域内有效地减小壳体对于外来声波的反射,并且有可能完全消除任意选定空间点上的反射。
Glow discharge appears when applied voltage further increases . with air gap increases , the mean discharge magnitude reduces . there is not an obvious effect of water conductivity on the mean discharge magnitude at dry ice , however , the mean discharge magnitude increases when water conductivity increases 干冰时覆冰水电导率对平均放电量的影响不大;湿冰情况下,覆冰水电导率越大平均放电量越大,其平均放电量明显高于干冰。
The operation properties of the piezoelectric active member , such as its output displacement , output force and the relative problems , are experimentally studied in this paper . the experiment demonstrated the non - linear relation for the mechanical outputs to the applied voltage of the active member 本文通过实验研究了压电主动构件的工作性能、输出位移、输出力及其相关问题,验证了压电主动构件的力学输出量与其驱动电压的非线性关系。
The tunable performance is obtained by rotating the grating . the disadvantages of the mechanical tunable filter are high control voltage , slow response time and big volume . the electro - optic tunable filters are obtained by the alteration of the birefringence of the electro - optic material applied voltage 电子光学滤光片则是通过施加电压使各种电子光学材料的双折射率发生变化来实现透射波长的调谐,也可以利用电光晶体在电场中的旋转来实现波长的调谐。
The degradation of the electrical characteristics in sic pn junctions irradiated by neutron is attributed to the recombination centers and the electric field effect on the thermal emission of traps within the depletion region . the relationship of the ideality factor to the applied voltage is theoretically studied 提出了中子辐照下sicpn结电特性退化的新的理论, pn结耗尽区中的辐照陷阶在耗尽区电场的作用下热发射效应得到加强,从而导致pn结正偏和反偏时的复合电流和产生电流的改变。
Under the applied voltage of 2v , the duration of colored process and bleaching process of the semisolid - state smart window was 2s and 1 . 5s respectively , which denoted rapid response velocities . researches on the glass / ito / wo3 / linbo3 / niox / au all solid - state smart window were referred to the effect of each film ' s thickness on the device ' s electrochromic properties . through the test of the visible light transmittance of the colored state and bleaching state of the device , it proved good electrochromic capabilities with the dynamic optical density changed between 0 . 2 - 0 . 5 并在此基础上继续研究了glass ito wo _ 3 linbo _ 3 nio _ x au结构的全固态智能窗器件模型,对于各薄膜层厚度对于器件电致变色性能的影响做了初步的研究,测试了器件可见光范围内的着色褪色透射光谱,光密度变化量在0 . 2 0 . 5范围内,表明器件具有良好的电致变色性能。
The square pattern has been obtained for the first time in dielectric barrier ar / air discharge at atmospheric pressure by using the double water electrodes and its spatio - temporal dynamics is measured by optical method . the phase diagram of pattern types as a function of air concentration and applied voltage by fixing other parameters is given 本论文采用特殊设计的双水电极介质阻挡放电实验装置,首次在氩气与空气的混合气体中获得了大气压常温下的稳定正方网格斑图,并对其进行了时空动力学测量。
At the same time , the mathematical models of the electric field and the flow field distribution were established from the theory of electrostatic enhancement of heat transfer . employed finite differential method and over - relaxation iteration method , according to certain boundary conditions in the wire - plate electrode space , the electric field and the flow field in the wire - plate space were numerically simulated under different initial velocities of r11 stream and different magnitudes of applied voltage . the calculation results agreed with theoretical analysis satisfactorily 同时从静电强化换热理论出发,建立了表征线板电极间的电场和流场分布的数学模型,并根据线-板电极间的边界条件,利用有限差分法和超松弛迭代法,分别就不同气流初速度和不同外施电压的情况下,对线-板空间的电场和流场进行了数值模拟,计算结果与理论分析基本一致。
In order to simulate the electro - optical performance of a liquid crystal cell an iterative finite - difference method is proposed in the present thesis to calculate the distribution of lc directors under an applied voltage . this new method is very stable and simple , and can give accurate results quickly as compared with the existing methods . when the parameters of a lc cell are unknown , a new model with three characteristic parameters is introduced to predict the electro - optical performance of the lc cell 本论文在液晶光器件的模拟计算方面,提出了液晶指向矢空间分布求解的新型算法,与已有算法相比较,具有简单稳定、精度高和通用性强的优浙江大学博士学位论文点;对于液晶材料参数未知的情况,提出了用于预测液晶盒电光特性的新型近似模型,分析了己有模型的参数确定问题,新模型提高了在预测不同厚度下液晶盒电光特性的精度;提出了液晶光波传输2x2扩展琼斯矩阵的简便形式。