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In order to analyse the performance of suppression nonlinear productions of feedforward amplifiers, the suppression equation of the loop has been established based on the model of a suppression loop. And the function relation between the performance of suppression nonlinear productions and the mismatching of amplitude, phase and delay of the loop has been developed. Simulation and analyzing results show that the delay mismatching is the dominant factor to affect the bandwidth of a feedforward amplifier. The... In order to analyse the performance of suppression nonlinear productions of feedforward amplifiers, the suppression equation of the loop has been established based on the model of a suppression loop. And the function relation between the performance of suppression nonlinear productions and the mismatching of amplitude, phase and delay of the loop has been developed. Simulation and analyzing results show that the delay mismatching is the dominant factor to affect the bandwidth of a feedforward amplifier. The resuts are significant for the design and debugment of the feedforward amplifiers. 为了便于分析前馈放大器对非线性产物的抑制特性,通过抑制环路模型,建立了环路抑制方程,并由计 算机仿真得到了环路对非线性产物的抑制性能与幅度失配、相位失配及延迟失配的理论数值关系.分析对比说 明,延迟失配是影响环路抑制带宽的主要因素,对前馈放大器电路的设计和调试具有指导意义. The phonon transmission coefficient is an important factor of affecting thermal contact conductance.The phonon transmission coefficient is discussed at low temperatures(20K~200K),the contact interfacial temperature difference,the elastic specular transmission and the scattering transmission were considered.The direction of heat flow affected the phonon transmission coefficient.The potential cause of error between the acoustic mismatch prediction and experiment was pointed out.The discussion on the phonon transmission... The phonon transmission coefficient is an important factor of affecting thermal contact conductance.The phonon transmission coefficient is discussed at low temperatures(20K~200K),the contact interfacial temperature difference,the elastic specular transmission and the scattering transmission were considered.The direction of heat flow affected the phonon transmission coefficient.The potential cause of error between the acoustic mismatch prediction and experiment was pointed out.The discussion on the phonon transmission coefficient will have an important sense for analyzing the thermal contact conductance. 声子传递系数是影响低温接触界面热传导的重要因素,文中对中间低温(20K~200K)接触传导模型的声子传递系数进行了讨论,分析了接触界面温差、弹性镜面传递和散射传递下的声子传递系数;还讨论了热流方向对声子传递系数的影响;指出了声失配理论预测值与实验值间存在差别的可能原因。该讨论对分析接触热传导有一定意义。 As an important part of affordable housing policy,the site selection of mid& low priced housing failed to counterbalance between equity and efficiency. How could it be done Taking into account of the actual conditions in Shanghai,this essay discusses the efficiency is-sue based on bid rent theory and the equity based on spatial mismatch theory. According to the Brueckner-Zenou Model and the principle of maximizing benefit,this essay points different site selection proposals for different groups of residents,and... As an important part of affordable housing policy,the site selection of mid& low priced housing failed to counterbalance between equity and efficiency. How could it be done Taking into account of the actual conditions in Shanghai,this essay discusses the efficiency is-sue based on bid rent theory and the equity based on spatial mismatch theory. According to the Brueckner-Zenou Model and the principle of maximizing benefit,this essay points different site selection proposals for different groups of residents,and also the short-term and long-term proposals,taking into consideration of effi-ciency and equity. 中低价位商品房是保障性住房重要的组成部分,但是它的选址却面临着经济性与社会性二者难以兼顾的困境。如何选址才能找到符合二者利益最优化协调的选址地点?本文结合上海现状,在利用竞租理论分析其选址经济合理性的基础上,利用空间失配理论对上海的中低价位商品房选址进行社会性分析。通过引用Brueckner-Zenou最小工资模型,从福利最大化原则出发,指出不同配套房居民的可能选址范围,据此提出兼顾土地利用效率与居民福利的近期与长期选址建议。
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