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delaying line
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  相似匹配句对
     On-line
     行业在线
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     On line
     行业在线
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     Effects of Several Treatments on Delaying Panicle-differentiation of Rice Restorer Line Fuhui 838
     延缓辐恢838穗分化进程几种处理的效应分析
短句来源
     delaying the decrepitude of the body.
     延缓机体衰老。
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     Unscrambling Hamlet's Delaying
     解读哈姆莱特之延宕
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With the rapid progress of the electronic art, there has been a steadily increasing demand for still wider-bandwidth amplifiers. The recent introduction of distributed amplification concept has provided a new technique and powerful means for designing amplifiers with top cutoff frequencies far in excess of those previously obtainable with,ordinary amplifier circuits. A distributed amplifier of the low-pass type can easily be constructed to have a uniform frequency response from audio frequencies to frequencies...

With the rapid progress of the electronic art, there has been a steadily increasing demand for still wider-bandwidth amplifiers. The recent introduction of distributed amplification concept has provided a new technique and powerful means for designing amplifiers with top cutoff frequencies far in excess of those previously obtainable with,ordinary amplifier circuits. A distributed amplifier of the low-pass type can easily be constructed to have a uniform frequency response from audio frequencies to frequencies as high as several hundred me using conventional vacuum tubes. Unlike conventional circuits, distributed amplifiers have an attainable gain-bandwidth product which is not limited by shunt capacitance associated with the vacuum tubes and circuit wiring; the high-frequency limit being determined entirely by high-frequency effects within the tube proper.The purpose of this paper is to describe the basic principle of distributed amplification and to show how such an amplifier employing various types of transmission lines may be designed. Practical methods hi design and design details are given for a three-stage distributed amplifier, using fourteen 6AK5 pentodes with a frequency response of 0.1 mo to 140 mo and a gain of 33±1 db.Both the negative mutual-inductance m-derived and constant K artificial delay lines hare been used. The former offers the advantage of a more linear phase characteristic and a more uniform response both in amplitude and delay time.The experimental results corroborate the predictions based on the first-order theory described in this paper.

分布式放大是最近宽频带放大的最大成就,过去多年来电子学所应用的各种宽频带放大方法,其高频部分因受电子管电容和线路的分布电容所限制,不能获得理想的结果,而利用分布式放大的理论,所制成的宽频带放大器,远较一般普通的宽频带放大器,有更为宽阔的频带;从它的设计和构造上来看,也较负反馈的宽频带放大器为简单。制造一架自数千周至数百兆周的分布式放大器,在技术上并没有很大困难。本文拟对分布式放大的原理作扼要的分析;并提出了采用各类型仿真线所构成的分布式放大器的设计方法,并利用该设计方法,试作了一只三级十四管的分布式放大器,其增益为33±<1分贝,频宽自100千周至140兆周。由实验结果证明,采用m导出式低通滤波器所构成的仿真线的分布式放大器,实较用常K式者,具有更佳的相移特性和频率特性,这与理论上的分析是一致的。

Let a sluggish load of capacity Co be driven by a source of internal resistance Ro via an intermediate two-terminal pair. And let F12 denote the voltoge transmission fun-ction. The integral is indicated to have an interpretation as anindex of grade of performance of the transmission system matter not in frequency domain or in time domain senses. The author obtained through time domain artifice the power gain integral theorem formulated thus:Where W(∞) stands for the total stored energy in the complete system...

Let a sluggish load of capacity Co be driven by a source of internal resistance Ro via an intermediate two-terminal pair. And let F12 denote the voltoge transmission fun-ction. The integral is indicated to have an interpretation as anindex of grade of performance of the transmission system matter not in frequency domain or in time domain senses. The author obtained through time domain artifice the power gain integral theorem formulated thus:Where W(∞) stands for the total stored energy in the complete system at t=∞ after being kicked across Co by a unit impulse current introduced at t = 0,and Ri for the ith resistance in the inserted network with impulse response current ii (t) flowing in it.The integral will assume its maximum value when the intermediate network is all reactive and satisfying certain guite weak limitations such that W(∞) = 0. Hence it is concluded that transmission models under said limitations will behave with performance of transmission invariant of circuit structure and parameters of the intermediate network. It is also concluded that confining the pass band of F12 in narrow interval may result in greater than unity gain with the system being inert.The paper also points out that the usual desposition of loading transmission circuit in resistive termination for"matching" considerations should receive a con when the circuit is to work for wide band purposes; for example, delay lines never should be loaded with resistance(as the situation may tolerate) aside from unavoidable stray capacitance.

宽带讯号传输系统的模型可以归结为如下形式:讯号源经由内阻R_0通过介入电路驱动电容(惯性量)C_0。电压增益函数记为F_(12)。应用能量守恒律,并引用对偶互易定理及Parseval定理,作者得到功率增益的频率域积分(定理): integral from -∞ to ∞ (|F_(12)(jω)|~2dω/2π)=1/R_0[1/2C_0-W(∞)-sum from i (R_i) integral from 0 to ∞ (i_i~2(t)dt)]其中W(∞)为这一系统在C_0二端受单元脉冲电流冲击后在t=∞时的贮能,R_i为介入电路中第i个电阻阻值(其中流动的单元脉冲响应电流为i_i(t)))。文章指出integral from -∞ to ∞ (|F_2(jω)|~2dω/2π代表着系统的频域和时域传输品质。 如果介入电路为抗性电路,且满足一定条件使W(∞)得为0,则积分取极大值1/2C_0R_0。由此可见在一定条件下系统的传输品质是守恒的,它不随介入电路的结构形式(在前述条件下)及元件参量而改变。因而,如果使F_(12)的通带集中在一定窄的区域,可以取得无源增益。 由于沿袭有线通讯系统的习惯,往往讯号...

宽带讯号传输系统的模型可以归结为如下形式:讯号源经由内阻R_0通过介入电路驱动电容(惯性量)C_0。电压增益函数记为F_(12)。应用能量守恒律,并引用对偶互易定理及Parseval定理,作者得到功率增益的频率域积分(定理): integral from -∞ to ∞ (|F_(12)(jω)|~2dω/2π)=1/R_0[1/2C_0-W(∞)-sum from i (R_i) integral from 0 to ∞ (i_i~2(t)dt)]其中W(∞)为这一系统在C_0二端受单元脉冲电流冲击后在t=∞时的贮能,R_i为介入电路中第i个电阻阻值(其中流动的单元脉冲响应电流为i_i(t)))。文章指出integral from -∞ to ∞ (|F_2(jω)|~2dω/2π代表着系统的频域和时域传输品质。 如果介入电路为抗性电路,且满足一定条件使W(∞)得为0,则积分取极大值1/2C_0R_0。由此可见在一定条件下系统的传输品质是守恒的,它不随介入电路的结构形式(在前述条件下)及元件参量而改变。因而,如果使F_(12)的通带集中在一定窄的区域,可以取得无源增益。 由于沿袭有线通讯系统的习惯,往往讯号传输系统被终端于一定电阻。根据所得的定理,对于宽带系统,应该使终端免于阻性负载,才能使品质最良好。

The magnetic distributors(magnetic delay-line storage)possess a special

磁性分配器(磁移存器)在无触点遥控和电码遥测装置中占有特殊的地位。迄今为止,对它的稳定性分析只是片段的,缺乏通用的方法。而且,几乎都是运用微分的形式,并对于纯电阻负载来分析的。本文试图引入一种新的通用方法即差分方程和点变换图的方法来描述和分析各种类型分配器的稳定性。本文主要讨论了如下内容:①引出用差分方程,点变换图和参数平面上的稳定区域来分析分配器稳定性的基本思想;②对具有代表性的三种双拍分配器和—种单拍分配器电路在各种类型负载阻抗下的差分方程公式进行推导;③以二个实际的分配器作为例子进行定量分析,其中一部分还作了实验验证;④研究了双拍分配器的非矩形干扰和自起动问题。在讨论具有公共电阻的双拍磁性分配器时,作者还提出一种在参数平面上作稳定区域的实验方法。另外,在H_0允许变化范围、自起动能力等问题上亦得到一些有趣的结论。超越差分方程与点变换图配合还可用于分析其他设备,如:①带反馈的脉冲频率遥测发送器的稳定性;②用铁磁谐振原理构成的分配器推动电源的过渡过程等。

 
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