嵌入式水电气在线遥监控系统研究

该文介绍了一个基于CNA总线的嵌入式Web监控水、电、气在线遥控监控系统的架构方案,重点阐述其监控水、电、气管理系统的设计思路,对其中涉及的关键技术进行了较为详细的叙述。     

一种家庭异构网络系统终端设计

针对目前家庭通信网络日益复杂化和多样化问题,提出了一种新型的基于Wire-lessHART和PLC的无线自组织网络系统智能终端结构。通过兼容电力线通信、WirelessHART协议以及以太网的方法,实现了异构型网络通信、智能化控制家电等功能。     

基于级连分组BP网络的高精度手写数字识别

本文提出了一种基于级连分组网的手写数字识别的新方法。这种方法根据将每次分类任务简单化的思想,将每个网络的任务简化以提高其辨别能力。整个系统分为两级,第一级进行粗分类,选取前两个后选字。第二级对两个后选字进行细分类。每个细分类网络完成区分两类特定模式的任务,由于每个子网络分类数目的减少导致识别精度的提高。使用我们自己构造的含10万个字符的库进行测试,我们的系统达到了在拒识为5%以内时误识为0.067%。     

Discriminant subspace analysis: a Fukunaga-Koontz approach

The Fisher Linear Discriminant (FLD) is commonly used in pattern recognition. It finds a linear subspace that maximally separates class patterns according to the Fisher Criterion. Several methods of computing the FLD have been proposed in the literature, most of which require the calculation of the so-called scatter matrices. In this paper, we bring a fresh perspective to FLD via the Fukunaga-Koontz Transform (FKT). We do this by decomposing the whole data space into four subspaces with different discriminability, as measured by eigenvalue ratios. By connecting the eigenvalue ratio with the generalized eigenvalue, we show where the Fisher Criterion is maximally satisfied. We prove the relationship between FLD and FKT analytically, and propose a unified framework to understanding some existing work. Furthermore, we extend our our theory to Multiple Discriminant Analysis (MDA). This is done by transforming the data into intra- and extra-class spaces, followed by maximizing the Bhattacharyya distance. Based on our FKT analysis, we identify the discriminant subspaces of MDA/FKT, and propose an efficient algorithm, which works even when the scatter matrices are singular, or too large to be formed. Our method is general and may be applied to different pattern recognition problems. We validate our method by experimenting on synthetic and real data.     

高温水采暖系统内部氧腐蚀

对阜康冶炼厂高温水采暖系统内部产生氧腐蚀的原因进行分析，采取相应的措施，收到良好的效果     

Experimental research on air film formation behavior of air cushion belt conveyor with stable load

In this paper, the air film formation behavior of air cushion belt conveyor with stable load is studied. The air cushion field is analyzed by means of theoretical derivation, numerical simulation and experimental research. An intelligent experiment platform is developed. Three dimensional pressure distribution of air film and the air film thickness distribution along the conveyor belt in the width direction are obtained. The experimental result is analyzed by comparing with theoretical calculation and numerical simulation. The numerical and theoretical results are in good agreement with those obtained from experiments. The air film formation behavior pattern of air cushion belt conveyor with stable load is presented. The optimized film thickness and pore distribution are obtained based on the comprehensive energy consumption. This study provides a basis for the optimization design of air cushion belt conveyor.     

Disruption of Synechocystis PCC 6803 for lipid extraction

In order to extract intracellular lipids from cyanobacterial Synechocystis PCC 6803 for biofuel production, seven cell-disruption methods - autoclaving, bead beating, freeze drying, French press, microwave, pulsed electric fields (PEF), and ultrasound - were tested prior to lipid extraction to make intracellular lipids more accessible by organic solvents. The different methods brought about distinct disruption effects to the cell envelope, plasma membrane, and thylakoid membranes that were related to extraction efficiency. Microwave, PEF, and ultrasound with temperature control had significant enhancement of lipid extraction (9-13% increases). Bead beating, freeze drying, and French press did not provide significant enhancement of lipid extraction. Furthermore, autoclaving, French press, and ultrasound treatments caused significant release of lipid into the medium, which may increase solvent usage and make medium recycling difficult. In order to minimize the cost of cell-disruption and lipid-extraction steps, microwave and PEF (with temperature control) might be best suited for large-scale cell disruption among all techniques investigated.     

单通道TD-SCDMA射频拉远单元

该文设计了一种单通道TD-SCDMA射频拉远单元。首先根据系统要达到的性能指标要求,设计了系统拓扑结构,接着从该系统拓扑结构出发,分析了整个系统的设计思路及实现方案,选择相应的电路模块。测试结果表明设计的系统达到了预期的指标,临近通道功率比小于-40.64 dBc和误差向量幅度为5.08%rms。     

毛泽东的社会主义发展阶段思想与社会主义初级阶段理论

毛泽东在领导中国人民探索建设社会主义的过程中，对社会主义发展阶段问题进行了深入的思考，提出了许多重要的思想。这些宝贵的思想成为我们党形成社会主义初级阶段理论的思想来源之一。探讨毛泽东与社会主义初级阶段理论的关系，有助于我们加深理解毛泽东思想及其和邓小平理论之间的渊源关系。     

罗冰生:优化钢铁工业结构推进增长方式转变

在7月31日召开的中国钢铁工业协会二届七次常务理事(扩大)会议上,中国钢铁工业协会常务副会长兼秘书长罗冰生作了题为《优化钢铁工业结构,推进增长方式转变》的工作报告。报告分析了今年上半年钢铁行业运行情况和下半年钢铁行业发展态势。