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The possibility of using a semiconductor thermal probe to investigate the power flow distribution in waveguides


The electric field and power flow density distributions within and outside of amplifying FBGs permit to understand electrodynamically the process of amplification in modulated media.


The reformulation of Helmholtz's equation in the MSE to the full set of firstorder differential equations leads to dealing with the electric field amplitude, its derivative, power flow density and phase distributions in any aperiodic media.


The reformulation of Helmholtz's equation in the MSE to the full set of firstorder differential equations leads to dealing with the electric field amplitude, its derivative, power flow density and phase distributions in any aperiodic media.


As an application of the method two straight waveguides are connected by a curved bend and the power flow is determined.

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 In the present paper an attempt has been made to clarify the effect of the hand of screw thread (right or lefthand) of the feeding screw on the distribution of power flow during forward and backward operations of a differential screwing mechanism in rotary drills. The functional relationship between the efficiency of the drills and the speed ratio of screw pairs has also been studied.The following results have been proved analytically and graphically by the author: 1.The mechanism with righthand screw... In the present paper an attempt has been made to clarify the effect of the hand of screw thread (right or lefthand) of the feeding screw on the distribution of power flow during forward and backward operations of a differential screwing mechanism in rotary drills. The functional relationship between the efficiency of the drills and the speed ratio of screw pairs has also been studied.The following results have been proved analytically and graphically by the author: 1.The mechanism with righthand screw during forward feeding has circulating power, whereas with lefthand screw there is none or less than that with righthand screw.2. The mechanism with lefthand screw during backward feeding has circulating power, whereas with right hand screw there is none or less than that with lefthand screw 3.The mechanism with righthand screw during backward feeding or with lefthand screw during forward feeding has circulating power only when: Mpower in mechanism increases the torques on the feeding screw and the intermediate shaft, and therefore increases the size of the machine parts and the overall dimension of the drill.5.Further, its presence also greatly decreases the mechanical efficiency of the drill.In order to decrease the size of the drill and to raise its efficiency, measures should be taken as follows: 1.If the drill is to take the forward feeding only, a lefthand power screw should be used. Hence by using the efficiency equations, derived in this paper, the optimum speed ratio to get higher efficiency of the screw pairs can readily be selected.2.If the drill is to take both the forward and backward feedings,then the existence of circulating power could not be avoided. In this case, according to the external loads M and P during forward and backward feedings, the threadhand should be so selected that the circulating power will be kept to a minimum. And then, by selecting the proper speed ratio of screw pairs in the corresponding efficiency equation, a higher mechanieal efficiency could still be obtained.  本文阐明采用差动螺旋推进机构的旋转式钻机,在前进钻孔与后退扩孔时,差动螺旋的螺纹方向(左或右)对钻机功率流的影响.此外,对于丝杠螺母角速比跟钻机效率之间的关系也作了分析. 本文用分析法得出如下结果: 1.右螺纹丝杠在前进钻孔时将产生涡流功率,此时如采用左螺纹,则一般无此现象,即使有的话,也较右螺纹时的涡流功率小得多. 2.左螺纹丝杠在后退扩孔时将产生涡流功率,此时如采用右螺纹,则一般无此现象,即使有的话,也较左螺纹时的涡流功率小得多. 3.右螺纹丝杠,后退扩孔或左螺纹丝杠前进钻孔时,出现涡流功率的条件是 M 本文阐明采用差动螺旋推进机构的旋转式钻机,在前进钻孔与后退扩孔时,差动螺旋的螺纹方向(左或右)对钻机功率流的影响.此外,对于丝杠螺母角速比跟钻机效率之间的关系也作了分析. 本文用分析法得出如下结果: 1.右螺纹丝杠在前进钻孔时将产生涡流功率,此时如采用左螺纹,则一般无此现象,即使有的话,也较右螺纹时的涡流功率小得多. 2.左螺纹丝杠在后退扩孔时将产生涡流功率,此时如采用右螺纹,则一般无此现象,即使有的话,也较左螺纹时的涡流功率小得多. 3.右螺纹丝杠,后退扩孔或左螺纹丝杠前进钻孔时,出现涡流功率的条件是 M  In this paper the powerflow relations between the mixed waves in optical frequency range are derived for the dispersive media from the Maxwell's equations. Thus, the ManleyRowe relationships in the theory of parametpic amplifiers are extended to the optical frequency range.The process to generate third harmonic by twice using the second nonlinear effect is studied here. And it is shown from the results of counting that under certain condition of phase matching (k_22k_1 In this paper the powerflow relations between the mixed waves in optical frequency range are derived for the dispersive media from the Maxwell's equations. Thus, the ManleyRowe relationships in the theory of parametpic amplifiers are extended to the optical frequency range.The process to generate third harmonic by twice using the second nonlinear effect is studied here. And it is shown from the results of counting that under certain condition of phase matching (k_22k_1  由Maxwell方程组求得了非线性色散介质中产生的光频混频波功率之間的关系,将参量放大的ManleyRowe关系式推广到光频波段。本文还討论了由二次二級非綫性效应产生三次諧波的过程,計算結果表明,在一定的位相匹配条件下(k_22k_1  In this paper, test results on dynamic models of static var compensators as chief means to control the nodevoltages and reactive power flows in power systems are described. Particularly, the characteristics of nodevoltages versus reactive power flows is analyzed, then followed by an application of this characteristics to the problem of automatic voltage control of power systems, and finally general conclusions about the actions of the excitation control regulator of static var compensator... In this paper, test results on dynamic models of static var compensators as chief means to control the nodevoltages and reactive power flows in power systems are described. Particularly, the characteristics of nodevoltages versus reactive power flows is analyzed, then followed by an application of this characteristics to the problem of automatic voltage control of power systems, and finally general conclusions about the actions of the excitation control regulator of static var compensator on the automatic voltage control of node points in power systems are given. According to this idea, electric power systems are possible to be designed.  文中概述了利用静止无功补偿器作为电力系统无功补偿及电压控制的主要手段在动态模型上的试验研究结果。着重分析了电力系统的电压－无功功率特性，并将电力系统的这一特性应用于自动调节系统的分析中，从而得出关于静止补偿器励磁调节器在电力系统中自动调压作用的一般概念，为工程设计提供依据。   << 更多相关文摘 
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