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filter used
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  滤光片
     The Design and Simulation of WDM Filter Used in Two Channel Optical Fiber Communication
     双通道光纤通信波分复用滤光片的设计与模拟
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     Tunable Liquid Crystal Filter Used for Line-selection of Ar~+ Laser
     液晶调谐滤光片对Ar~+激光器谱线的提取
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     In this paper the principle and procedure for designing birefringent filter used in tunable Ti:sapphire laser are described and a design example is given.
     本文讨论了用于可调谐钛宝石激光器的双折射滤光片的设计原理,并且给出了一个设计实例。
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     Analysis on Transmission Characteristics of a Multilayer Thin-film Narrowband Filter Used in Tilted Incidence
     一种斜入射多膜窄带滤光片透射特性分析
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     The principle of determination of the extinction coefficient is illustrated and the precision of the calculated extinction coefficient in a Ta_2O_5/SiO_2 filter used in a dense wavelength division multiplexing system is analyzed.
     以离子束溅射的Ta2O5/SiO2波分复用滤光片为例,分析了这种评价方法的基本精度.
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     Design of the Decimation Low Pass Filter Used in a 14-b 1.5625 MHz Sigma-Delta A/D Converter
     14位1.5625MHz的ΣΔA/D中的降采样低通滤波器的设计
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     Optical Haar Wavelet Filter Used for Photoelectric Hybrid Robot Vision System
     用于光电混合机器人视觉系统的光学Haar小波滤波器
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     The Design and FPGA Verification of Interpolation Filter Used in △-∑DAC
     △-∑DAC中插值滤波器的设计以及FPGA实现
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     Using the refractive index in the experiments,a 200 GHz narrow band pass filter with 71 layers composed of silicon and silicon dioxide was designed. The filter,with the loss 0.18 dB at peak value,wavelength bandwidth 0.86 nm at 0.5 dB,wavelength bandwidth 1.91 nm at 0.25 dB,ripple coefficient of the pass band ξ=0.12 dB,conforms to the suggestion of the ITU to the optical filter used for DWDM.
     使用实验得到的硅膜层和二氧化硅组合,设计了有71层膜层、信道间隔为200GHz的光学滤波器,峰值插入损耗0.18 dB,0.5 dB处的波长带宽为0.86 nm,0.25 dB处的波长带宽为1.91 nm,通带波纹系数ξ=0.12 dB,满足国际通信联盟(ITU)对密集波分复用系统(DWDM)用窄带滤波器的要求.
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     A Duplexer with Directional Filter Used in 1GHz Communication System: Analysis of its Properties and Determination of its Specifications
     1GHZ通信系统采用定向滤波式双工器的性能分析及其重要指标的确定
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  filter used
Sensitivity of the maximum entropy spectra to the length of filter used is also discussed.
      
The optimal positions are found for the rotational axis of a light filter used in different applications and meeting practical requirements.
      
The filtering characteristics of the spatial filter used in the velocimeter are studied theoretically.
      
This approximation is constructed by combining the First-Order Conditional Estimation (FOCE) method used in non-linear mixed-effects modelling with the Extended Kalman Filter used in models with SDEs.
      
An index (or normalized output value) associated with the filter used to approximate the epicardial boundary along the posterior wall provides an indication of the quality of the image and a reliability measurement of the estimate.
      
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A new design of metal—dielectric interference filter is reportod in this paper. The physical idea of this type of interference filter is mentioned.Seven—layer and eleven —layer metal—dielectric interference fileter is studied in detail.The influence on the position of the main trasmission peak by the precision of control is analysed. The aging effect of the metal—dielectric interference filter is studied. Ordinary color glass filters used in accompany with the interference filter...

A new design of metal—dielectric interference filter is reportod in this paper. The physical idea of this type of interference filter is mentioned.Seven—layer and eleven —layer metal—dielectric interference fileter is studied in detail.The influence on the position of the main trasmission peak by the precision of control is analysed. The aging effect of the metal—dielectric interference filter is studied. Ordinary color glass filters used in accompany with the interference filter (out off the subsidiary peaks) is mentioned.The ways of improving this kind of light filter is also discussed in this paper.

本文报导了“金属——电介质”干涉滤光片的研究结果。文中叙述了此种滤光片提出的物理思想。并从实验上对金属干涉滤光片,“金属——电介质”干涉滤光片做了比较。着重研究了对称的七层和十一层“金属——电介质”干涉滤光片。分析了控制精度对透过主峰位置的影响。研究了“金属——电介质”干涉滤光片的时效。列举了制备不同波长的干涉滤光片所需要的颜色玻璃的牌号(卡去次峰)探讨了提高滤光片指标的途径。

Noisy images with a periodic structure can be cleared by utilizing optical periodic average method. In this paper the higher signal-to-noise ratio obtained by this processing method was discussed, the experimental apparatus was improved, the specific pattern of filter used in the coherent optical system and the experimental results were given.

利用光学周期平均法能够清晰地描绘带有噪声的周期性图象。本文讨论了用这种处理方法所得到的较高信噪比,改进了实验装置,给出了相干光处理系统所使用的滤波器的具体形式和实验结果。

The paper indicates and explains the fact:the output of traditional negative sequence current filters used as the starting element in protective devices during a simultaneous 3-phase fault depends only upon the d.c component of the fault current and would disappear at certain incident angle. This effect leads to the failure of opration of the protective devices.A specially designed negative sequence current filter is presented.The new scheme provides satisfactory performance over pick-up variance,high...

The paper indicates and explains the fact:the output of traditional negative sequence current filters used as the starting element in protective devices during a simultaneous 3-phase fault depends only upon the d.c component of the fault current and would disappear at certain incident angle. This effect leads to the failure of opration of the protective devices.A specially designed negative sequence current filter is presented.The new scheme provides satisfactory performance over pick-up variance,high stability under power swing and uninterrupted output during 3-phase faults.

目前国内继电保护装置中使用的负序电流滤序器,存在着动作离散度大及三相短路不能可靠起动等缺陷,影响电力系统安全运行,这个问题在今后生产的装置中应予解决。 本文介绍的三相式负序电流滤序器设计合理,接线不复杂,在动作离散度,三相短路动作可靠性及抗振荡性能方面,均获满意结果,其性能较目前使用者有显著改善。动作时间的相对离散度仍较大,但最慢不超过5毫秒,故不影响使用。在纯电阻性电流下,非对称故障的动作离散度仍较大,但不论非对称或对称故障,动作电流都不大于电感性电流下的数值,故对整定计算或实际运行都不会带来不便。 使用新型滤过器后,可适当简化试验标准,例如在常规的定值检验时,无需使用合闸角控制器,无需摸拟两相转三相短路试验,以减轻调试工作。由于负序电流起动元件一般都做成增量元件,故试验电流宜用电感性的,以符合实际情况。

 
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