The dual reciprocity boundary element method for solving Cauchy problems associated to the Poisson equation

This paper presents an application of the dual reciprocity method (DRM) to a class of inverse problems governed by the Poisson equation. Here the term inverse refers to the fact that the boundary conditions are not fully specified, i.e. they are not known for the entire boundary of the solution domain. In order to investigate the ability of the DRM to reconstruct the unknown boundary conditions using overspecified conditions on the accessible part of the boundary we consider some test problems involving circular, annular and square domains. Due to the ill-posed nature of the problem, i.e. the instabilities in the solution of these problems, the DRM is combined with the Tikhonov regularization method.     

场的互易性与网络的互易性关系研究

将电磁场的互易原理应用于二端口高频互易网络，推导出其网络参数的互易性，结果表明场的互易与网络的互易是紧密相关，相辅相成的。     

Dynamic analysis of dam–reservoir-foundation interaction in time domain

In this paper, a time domain dynamic analysis of the dam–reservoir-foundation interaction problem is developed by coupling the dual reciprocity boundary element method (DRBEM) for the infinite reservoir and foundation domain and the finite element method for the finite dam domain. An efficient coupling procedure is formulated by using the substructuring method. Sharans boundary condition at the far end of the infinite fluid domain is implemented. To verify the proposed scheme, numerical examples are carried out and compared with available exact solutions and finite–finite element coupling results for the problem of the dam–reservoir interaction. Finally, a complete dam–reservoir-foundation interaction problem is solved and its solution is compared with previously published results.The author is thankful to the anonymous reviewer of this paper for his suggestions and comments, which improved considerably the present paper.     

加速度传感器互易校准的新方法

在传统的加速度传感器互易校准的基础上,提出了一种新的互易校准方法,该方法采用任意激励方式取灵敏度比γ1,从而大大地降低了传统互易校准方法对计量设备与校准技术的要求,而该方法可方便地推广应用于一般工程单位或工程现场。     

航权资源双边谈判的序贯互惠博弈建模与分析

针对国际航权资源双边谈判问题,对谈判双方基于战略谈判关系和价值对等原则的博弈关系进行研究,提出了基于谈判方议价能力、关联产业补偿、产业空间预留价值和资源空置价值耗损4个维度的指标来描述航权资源议题的价值,建立适用于针对不同类型议题的物质收益函数,基于互惠偏好理论,提出互惠动机和单方面施惠动机来描述双方在战略谈判关系下博...     

科技日语翻译应注意的几个问题

科技日语翻译时要注意做到准确性、简明性、科学性和具有美感。这应该是所有科技翻译应该遵循的几个原则。     

A new application of an improved DRBEM model for water wave propagation over a frictional uneven bottom

This paper presents a numerical scheme to approximate water wave diffraction, refraction and frictional dissipation over an axi-symmetric pit. Based on an improved extended mild-slope equation (EMSE) including bottom friction effect, as the elliptic governing differential equation, dual reciprocity boundary element method (DRBEM) is employed to model water wave propagation over an axi-symmetric pit. To the authors' knowledge, this is the first application of DRBEM for water wave scattering over a pit. In order to promote accuracy of the model, not only effects of the bottom curvature and the slope-squared terms which are neglected in the mild-slope equation (MSE), are considered, but also effect of the bottom friction is measured by the improved EMSE. Numerical results are compared with existing analytical or numerical solutions or with experimental data by several examples. Through these numerical experiments reliability and efficiency of present DRBEM model for determining the total wave field over an uneven bottom is approved.     

利用TDD信道互易性和现有LTE帧结构实现信道预测

随着IMT-Advanced标准化进程的展开,TDD技术的研究成为利用和延续我国已有技术TD-SCDMA、TD-LTE的重要手段之一。本文在利用TDD信道互易性的基础上,针对现有LTE帧结构2,提出了基于MMSE(最小均方误差)的线性信道预测模型,同时,对在不同移动速度下单帧递推信道预测及多帧递推信道预测的性能进行了仿真和对比。     

Coordinated multi-point transmission technique in TDD cellular mobile system

小区间干扰是影响未来蜂窝移动通信系统性能的主要因素,如何克服小区间干扰成为系统设计的关键所在。多点协作传输技术通过控制相邻小区之间的干扰,并将原本是干扰的信号转变为有用信息,从理论上突破了单点非协作系统的干扰受限容量,实现了链路可靠性的提高和传输速率的增加。多点协作技术传输技术被认为是降低小区间干扰、提升小区边缘吞吐量和系统吞吐量的更本质更有效的技术。TDD蜂窝移动通信系统中实现多点协作传输技术具有天然的优势：多点协作所需的大量的信道状态信息在TDD系统中通过上下行信道的互易性可以很容易的获得。本文对TDD系统实现多点协作传输的方案以及可能遇到的问题进行了分析,并通过系统仿真结果证明了两者结合所能带来的性能增益。     

叠加定理在电路教学中的妙用

叠加定理是线性电路中一个非常重要的定理,在电路分析中有着很广泛的应用。本文着重讨论了在双口网络和互易定理的学习中如何利用叠加定理帮助学生理解、证明和辅助记忆所学内容。我们借助叠加定理可以简化一些知识难点的学习和记忆,还为电路教学中知识点的融合交叉做了有益的尝试。