Nash bargaining solution based multi-cell and multi-user interference alignment scheme for cellular networks

In wireless cellular networks, the interference alignment （IA） is a promising technique for interference management. A new IA scheme for downlink cellular network with multi-cell and multi-user was proposed, in the proposed scheme, the interference in the networks is divided into inter-cell interference （ICI） among cells and inter-user interference （IUI） in each cell. The ICI is aligned onto a multi-dimensional subspace by multiplying the ICI alignment precoding matrix which is designed by the singular value decomposition （SVD） scheme at the base station （BS） side. The aligned ICI is eliminated by timing the interference suppression matrix which is designed by zero-forcing （ZF） scheme at the user equipment （UE） side. Meanwhile, the IUI is aligned by multiplying the IUI alignment precoding matrix which is designed based on Nash bargaining solution （NBS） in game theory. The NBS is solved by the particle swarm optimization （PSO） method. Simulations show that, compared with the traditional ZF IA scheme, the proposed scheme can obtain higher data rate and guarantee the data rate fairness of UEs with little additional complexity.     

基于Google Earth的导航电子地图设计

文中对Google Earth的二次开发进行了研究,基于MFC进行软件编程,设计了导航电子地图软件。通过调用Google Earth API函数和Windows API函数,将 Google Earth 视图窗口嵌入到软件界面中,使用钩子技术实现在Google Earth视图窗口中右键弹出菜单,结合CMarkup类和BasicExcel类实现在电子地图上添加航迹点和航线,从而实现了在电子地图上进行航迹规划和显示实时航迹的功能。经过实际运行,软件执行效果良好,很好地完成了各种功能。     

Pb/Sn凸点的制备

介绍了用电镀法制备Pb / Sn凸点的工艺,包括:凸点的设计,圆片的准备,溅射UBM(凸点下金属层),厚膜光刻,电镀Cu柱, Pb / Sn凸点,回流凸点等。结果表明:采用电镀法可以得到球形Pb / Sn凸点,50μm的厚胶工艺是可行的。     

RCS测量雷达标定过程中的误差分析

在利用RCS(雷达散射截面)测量雷达对目标进行RCS测量中，为了能得到准确的RCS值，首先必须进行标定。天馈系统的标定可利用气球放飞的定标球，接收机的标定可利用标准信号源。由于标定中实施条件、使用仪器及方法的不理想。会对标定结果造成误差，气球的RCS、定标球的加工误差、雷达对定标球的对准精度是对标定结果有较大影响的一些误差源。     

铜、银和铂原子纳米团簇负热容现象的分子动力学模拟研究

本文采用微正则分子动力学方法模拟研究了铂、铜和银原子纳米团族从固态到液态的熔化过程,得到热容量随温度变化关系,结果表明这三种金属纳米团簇在熔化过程中均出现了负热容现象,并通过对团簇热能随温度的变化关系以及团簇原子数径向分布的分析,探讨了产生负热容现象的微观机制.     

Evaluating and monitoring the packing behavior of process-scale chromatography columns

The packing characteristics of process-scale chromatography columns were evaluated using the responses to conductivity-based pulse and step inputs derived from tracer experiments and in-process transitions (i.e. column equilibration and regeneration steps). Characteristics of the measured residence time distributions (RTDs) were quantified by statistical moments and using the equations derived from the Gaussian model. The first and second moments calculated from in-process step transitions for multiple runs were in good agreement with those moments calculated from the pulse-input experiments conducted immediately after column packing. This indicates that most of the time the bed behavior at the time of packing is consistent with that at the time of operation. Due to the significant resistance to protein mass transfer inside the particles, estimated plate heights for protein solutes are expected to be much greater than those observed from the experiments using saltbased tracers. Thus, the column efficiency derived from salt-based experiments can be a useful measure of packing consistency rather than a significant parameter influencing the outcome of protein separations.     

The series solution of the Marchenko equation

The convergence of a Neumann-series solution of the Marchenko equation in L ₂[x, ∞) is proved and an explicit expression of the series solution is given.     

Theoretical Studies of O(1D)+HD (v=0, j=0, 1, 2, 3)→OD(H)+H(D) Reaction

利用准经典轨线计算方法在DK势能面上对O+HD进行了计算,获得了产物的反应截面和分支比OD/OH. 计算结果表明,当碰撞能由4.6 kJ/mol增加到46.0 kJ/mol时,产物的反应截面随着碰撞能的增加明显减小;产物的平均分支比随着转动量子数的增加逐渐减小.