红外辐射匹配研究及软基涂层干燥设计

在分析目前红外匹配吸收设计理论和应用的基础上,提出了最佳匹配吸收的设计方法.对于工程背景,比较了软基涂层热风干燥与红外线干燥的特点,分析了红外干燥优点和难点以及必须解决的问题,研究确定了符合最佳匹配的元件表面温度;进行了满足辐射场要求的辐射器的科学布置,设计了简单低廉的温度控制以及带基保护的机、热连锁结构和参数,取得了节能、提高生产率和提高产品质量的多重效果.取得的结果也可作为其它红外节能加热设计时参考.     

Ion‐Pair‐Based Assemblies Comprising Pyrrole–Pyrazole Hybrids

Modified 3,5‐dipyrrolylpyrazole (DPP) derivatives in their protonated form produce planar [2+2]‐type complexes with trifluoroacetate (TFA) ions. These complexes serve as constituent components of ion‐pair‐based assemblies. An essential strategy for the construction of dimension‐controlled organized structures based on these [2+2]‐type complexes is the introduction of aryl rings bearing long alkyl chains, which enables the formation of 2D patterns at interfaces, supramolecular gels, and mesophases.     

基于神经网络的软测量在隔离型换热节能系统中的应用

隔离型换热节能系统的模型研究对系统优化有着现实意义。在对系统结构介绍的基础上,建立了系统的稳态机理模型。针对系统模型中的关键参数难以测量的问题,提出采用基于RBF神经网络的软测量方法加以解决,并利用现场数据进行了实验研究。结果表明,所提方法是可行、有效的。     

OFDM系统中改进的16QAM软判决解调算法

针对OFDM信号在多径衰落信道中传输的特点,提出了一种改进的16QAM解调软信息计算方法,通过在均衡时利用信道信息改善信号总体的信噪比水平,并且使软判决结果包含更多的信道信息,从而提高软判决译码的性能。仿真结果表明,所提出的方法能有效地改善系统在多径衰落信道环境下的性能,且易于工程实现。     

一种改进的基于FG-Turbo多用户检测的软干扰消除算法

基于因子图与和积算法,给出了基于LDPC的FG-Turbo多用户检测扩展模型,仿真比较了最优MAP算法和软干扰消除算法的性能,并提出了一种基于敏感比特的软干扰估计新方法。仿真结果表明,改进后的软干扰消除算法在复杂度不变的情况下,有效地改善了系统性能。     

高阶调制解调下的低复杂度软信息求解

现代通信系统中,软译码可有效提升译码性能,高阶调制如MQAM和MPSK能够在不增加带宽的同时获得高的传输速率。但高阶调制解调模式下软信息的精确求解过于复杂,目前已有的近似算法性能损失过大。针对软输入技术,结合16QAM和32PSK 2种高阶调制方式,对软信息计算作进一步分析,提出了采用数值逼近的方法对16QAM的最小距离软信息计算公式进行修正和采用旋转坐标转换软信息量度方案的方法对32PSK的软信息计算公式进行修正的2种算法。结合LDPC码的仿真结果表明,算法在不增加计算复杂度的前提下,其性能仍能进一步逼近理论算法。     

浅议WCDMA系统的关键技术

首先描述了WCDMA系统网络结构,接着重点介绍了WCDMA系统的几个关键技术,包括:无线信道编码技术、分集技术、软切换技术和功率控制技术等,为日后学习和研究WCDMA网络优化提供了重要的参考价值。     

A two‐stage receiver with soft interference cancellation for space–time block code and spatial multiplexing combined systems

This paper presents a new space–time two‐stage receiver with the assistance of soft information for the Alamouti space–time block code (STBC) and spatially multiplexing (SM) combined multiple‐input multiple‐output (MIMO) systems, which possess both the advantages of high diversity gain and high data rates to entail the next generation wireless communication systems. The first stage of the receiver, utilizing the inherent structure of the STBC, consists of a bank of soft generalized sidelobe canceller (GSC)‐based detectors, each for every STBC block, and intends to yield a more precise initial estimate of the transmitted symbols. In the second stage, the groupwise detection is conducted successively by using the matched filters (MFs) to simultaneously detect the two consecutive symbols in one STBC block with the removal of the soft interferences in between. Since the interferences have been faithfully reproduced and thoroughly annihilated, the new receiver can yield accurate symbol detection even with simple MFs. Moreover, some extreme cases regarding the soft information employed in the new receiver and its extension to the multiuser (MU) MIMO downlink are addressed as well. Conducted simulations show that the developed receiver, with modest computational load, can provide superior performance compared with pervious works, especially in the MU MIMO downlink. Copyright © 2010 John Wiley & Sons, Ltd.     

Tuning the Porosity of Bimetallic Nanostructures by a Soft Templating Approach

Hexagonal mesophases made of oil‐swollen surfactant‐stabilized tubes arranged on a triangular lattice in water and doped with metallic salts are used as templates for the radiolytic synthesis of nanostructures. The nanostructures formed in this type of soft matrix are bimetallic palladium‐platinum porous nanoballs composed of 3D‐connected nanowires, of typical thickness 2.5 nm, forming hexagonal cells. Using electron microscopy and small‐angle X‐ray scattering it is demonstrated that the pore size of the nanoballs is directly determined by the diameter of the oil tube of the doped mesophases, which is varied in a controlled fashion from 10 to 55 nm. Bimetallic nanostructures composed of various proportions of palladium and platinum can be synthesized. Their alloy structure is studied using X‐ray photoelectron spectroscopy, energy‐dispersive X‐ray spectroscopy, and high‐angular dark field scanning transmission electron microscopy experiments. The templating approach allows the synthesis of bimetallic nanoballs of tunable porosity and composition.