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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。

Factory engaged in professional production and sales of high-speed automatic vacuum molding machine, high frequency plastic welding machine, blister sealing machine, the production of refined aluminum blister mold, copper mold, mold high-frequency, voltage-mode, copper engraving , the use of masks in Blister Packaging, PVC tape, transparent plastic boxes, CD sets, business cards of this, folders, jelly bag, such as soft PVC products, hardware products.

本厂从事专业生产销售全自动高速真空吸塑成型机,高周波塑胶溶接机,吸塑封口机,制作精致吸塑铝模,铜模,高周波模具,电压模,雕刻铜模,使用于吸塑罩包装,PVC胶带,透明胶盒,CD套,名片本,文件夹,果冻袋,等PVC软胶制品,硬胶制品。

"Exception No.1: A unit having resistive circuity , high-impedance winding , and the like , not subject to excessive secondary-voltage build-up in case of electrical breakdown during the test may be tested :"

"例外1:具有电阻性电路,高阻抗绕组以及类似物在测试时由于电击穿可能产生过高次级电压的电源单元,可以按下列方法试验:"

When the main gap being closed at interval of a certain time, three pulses were obtained on the field-emission diode, the peak power of each pulse was over 20 GW, pulse duration about 80 ns, and pulse interval about 15 ms.

在场发射二极管上获得3个峰值功率大于20 GW,半高脉宽约60 ns,脉冲间隔约15 ms,电压约400 kV的高功率电脉冲。

By using this method, the angular frequency, amplitude, initial phase angle, decay constant of each component in transient voltage and/or current waveforms can be precisely extracted. Also, all other kinds of transient procedure can be analyzed by this method. Thirdly, a new definition of generalized instantaneous reactive power and generalized instantaneous reactive current in dq0 coordinates under any nonsinusoidal and unbalanced three-phase circuit is proposed for the first time. The detection and compensation method for different instantaneous reactive currents are also concerned.

本文首先提出了用于快速高精度频谱分析的一种改进快速傅立叶变换方法,该法具有速度快、精度高、抗混迭、不受采样定理约束、可以分析出谐次大于N/2的频谱系数等特点,可方便地应用于电力系统谐波分析及其它各类频谱分析;然后提出了基于非线性最小二乘优化法的电力系统暂态波形分析方法,可准确求出电力系统暂态电压、电流波形中各个分量的角频率、幅值、初相角及衰减常数,并可广泛应用于各类暂态过程波形分析。

SB2015-3 Precision Decade DC Resistance Box adopts high voltage glass glaze resistors and special high voltage seal switch.Its electric performance is very stable and insulation intension is very high.The resistance value can be adjusted under the condition of ceaselessly opening voltage(Note:The using switch should not be at the point of 0.)It is easy to operate and suitable to be used to calibrate insulation resistance meter,and suitable to be used as high resistance standard.

SB2015-3型精密十进位直流电阻箱采用高压玻璃釉电阻器及独特的高压密封开关,电性能稳定可靠、绝缘强度高、可在不断开测试电压的条件下调节电阻值(正在使用的那只开关不处在"0"位置时)、操作方便,适用于检定/校准绝缘电阻表,也可作为高阻标准。

The electric field induced decomposition of ITO and electromigration of indium are responsible for the catastrophic failure, or thermal breakdown, of OLEDs. 5. Because of the importance of Si-based optoelectronics, We use p-type Si instead of ITO as the anode to fabricate OLEDs.

通过观察我们可以判定OLEDs器件的热击穿是由于其内部形成了严重的短路,而在高的正向驱动电压下器件严重短路的原因是器件内部本身存在的不均匀和ITO电极在高电场的作用下分解出的金属In沿着这些不均匀的位置在有机层电迁移扩散。

Beijing Institute of Technology, Beijing 100081,ChinaIn order to get the high output power, a RF excited diffusively cooled all-metal slab waveguide CO2 laser was reported, in which gas discharge region was constructed by two aluminum side walls and aluminum electrodes. The region dimension was 2 mm height×20 mm width×386 mm length, and the gas composition was CO2:N2:He:Xe=1:1:3:0.26. This technique replaced the old ceramic and metal sandwich waveguide technique.The optimum out power 127 W was achieved from the RF excited diffusively cooled all-metal slab waveguide CO2 laser with the longitudinal voltage uniformity distribution technique and scaling area technique. The electro-optic conversion efficiency was about 14%.

为了获得较高的激光输出功率,介绍了射频激励扩散冷却全金属板条波导CO2激光器,放电区域由左右两个铝合金壁和上下两个铝合金电极构成,放电区域高2 mm,宽20 mm,长386 mm,工作气体混合比CO2:N2:He:Xe=1:1:3:0.26,该技术代替了过去的金属陶瓷结构,结合纵向电压均匀分布技术和面增比技术,获得了127 W的激光输出功率,光电转换效率高达14%。

The carbon based materials have low electron affinity even negative electron affinity,and have the good ability of eradiating electrons in electric field.

其中非晶碳膜具有好的化学稳定性和热稳定性、高的熔点和热导率、小的介电常数、大的载流子迁移率和高的击穿电压,是一种很有前途的场发射冷阴极材料。

It is found that the utilization of BAlq3/Alq3 isotype heterostructure emitter further reduces the leakage current, leading the BAlq3/Alq3 isotype heterostructure-based devices to higher output current and higher common-emitter gain at the same operational voltage compared to the case of Alq3 as the emitter.

研究发现,同Alq3单发射极层结构的金属基极晶体管相比,BAlq3/Alq3异质结发射极层的使用进一步降低了器件的漏电流,使器件在相同的电压下表现了更高的输出电流和更高的共发射极增益,为进一步实现高性能金属基极晶体管提供了新的方法。

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She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了,但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场,你等着挨绳子吧!

Several theories about reigniting and extinguishing of the arc have been refered.

本文综合考虑了几种电弧重燃和熄灭理论。