The possibility of the desalination of actual 1,3-propanediol fermentation broth by electrodialysis

Electrodialysis (ED) was employed to remove the organic and inorganic salts from actual 1,3-propanediol (PDO) fermentation broth. These salts cause many problems during the purification of PDO if not removed. Suitable operation parameters such as applied potential and the flow rate of streams were selected to ensure a stable and durative desalination process for PDO fermentation broth. Under these conditions, the membrane fouling can be alleviated effectively by changing pole and cleaning membranes so that further industrial production is possible. The experiment results show that about 90% of organic acid salts in PDO broth are removed by the ED process. In addition, a simulated diffusion PDO experiment proved that the diffusion of PDO results in its loss from fermentation broth and the loss ratio is less than 6% under the chosen operating conditions.     

超宽带室内定位算法

为了解决室内密集多径环境下人员定位精度差这一问题,设计并实现了一种基于脉冲超宽带与能量检测接收机的信号到达时间估计算法。根据在IEEE802.12.4a标准室内家居环境下得到的超宽带信号,深入分析了信号的偏度、翘度与均方差特性。根据信号特性与信噪比之间的关系,算法能够实现高精度的信号传播时间估计。该算法充分考虑了积分周期与信号传播环境如视距与非视距对信号传播时间造成的影响。通过实验分析对比,该算法对信号传播时间估计具有更好的鲁棒性,目标运动速度和形变具有很好的鲁棒性,能够提供更高的精度。相较于阈值估计算法,该算法在低信噪比环境下最优能够提高10 ns的估计精度。     

噪声功率不确定性区间估计和降低SNR WALL恶化的能量检测算法

能量检测是认知无线电系统中广泛采用的空闲频谱检测方案,但其性能受到噪声功率不确定性(NPU)的严重影响。该文提出一种新颖的复杂度较低的NPU区间估计算法,并且从理论上分析了估计的噪声功率对能量检测信噪比墙(SNR WALL)恶化的影响,得出了SNR WALL恶化性定理。进一步基于门限修正提出一种改进的能量检测算法以消除SNR WALL恶化。仿真结果表明,该算法能较为精确地估计NPU区间,并且验证了SNR WALL恶化性定理的正确性;同时,改进的能量检测算法性能要优于稳健的统计方案(RSA)能量检测的结果,并且改进后降低了SNR WALL恶化,提高了检测的鲁棒性。     

Solution to economic dispatch problem with valve-point loading effect by using catfish PSO algorithm

This paper proposes application of a catfish particle swarm optimization (PSO) algorithm to economic dispatch (ED) problems. The ED problems considered in this paper include valve-point loading effect, power balance constraints, and generator limits. The conventional PSO and catfish PSO algorithms are applied to three different test systems and the solutions obtained are compared with each other and with those reported in literature. The comparison of solutions shows that catfish PSO outperforms the conventional PSO and other methods in terms of solution quality though there is a slight increase in computational time.     

低盐复合活性黑染料的对比研究

自制了低盐复合活性黑LS染料,测定了其低盐染色效果,并在染料的耐碱稳定性、溶解度、染色提升力、冷堆染色适应性及染后各项牢度等方面与活性黑ED染料进行了对比研究。     

认知无线电中一种基于秩准则的鲁棒多天线盲频谱感知算法

在多天线感知场景中,噪声不确定的存在使得经典的能量检测算法的感知性能表现出不稳定性。基于多天线接收信号的统计协方差矩阵为秩-1矩阵这一事实,提出一种基于秩准则的频谱感知方法。该方法首先将取样协方差矩阵分解为具有未知秩的理想信号矩阵和噪声扰动矩阵之和,然后采用秩检测准则估计接收信号子空间的最佳维数,最后利用该值判断信道的状态。与经典的能量检测方法相比,新方法对噪声不确定性具有良好的鲁棒性,且属于全盲检测方法。具体而言,新方法在感知判决过程中,无需事先知道噪声方差以及主用户信号和无线信道的统计特征。仿真结果验证了基于秩准则的多天线频谱感知算法的有效性。     

A Pre-Segmented Sharing Recovery Scheme for MPLS/GMPLS

Path recovery aims at helping network operators automatically detecting and recovering from faults before human being’s intervening, and therefore can before customers notice these faults. By applying some algorithm of recovery, service provider (SP) can enhance the speed of repair and save paying refunds against broken service level agreement (SLA). Fast restoration of traffic after a network failure is a crucial aspect of current and future IP and transport networks. Recently, there is a…     

电力系统经济调度中遗传算法的比较研究

本文介绍了在电力经济调度中用于改善系统运行性能的遗传算法的某些修改，目的是试图找出供遗传算法使用的最佳运行点，为了改善运行性能，涉及到问题的两个阶段，即首先是选择一种适当的遗传策略，其次是为所选定的遗传策略对各种参数的值进行协调，这两个阶段均已在六机系统中经过试验，并按照在线及离线两种情况对试验结果进行了比较，全部研究工作清楚地表明，采用先进的遗传算子及优化选择参数值能使系统性能显著增强。     

反渗透技术在苦咸水淡化工程中的应用

西安美星精密环保设备股份有限公司采用掺渗透装置,对咸阳国际机场供水进行净化,淡化处理,使水质较差,不宜用的Ⅲ级水成为符合国家生活饮用水卫生标准和卫生组织饮水水质准则的优质水。运行结果表明,反渗透技术处理含氟苦咸水是比还原沉淀法,电渗析法更为有效可行的水处理先进技术。