基于单片机的电脑弹簧机按键板的设计与实现

电脑弹簧机是用来生产弹簧的专用设备,按键板则是实现对弹簧机控制的一个人机交互的操作界面。本文介绍了电脑弹簧机按键板的设计及实现方法。该按键板采用薄膜面板开关的形式,用PS/2协议作为按键板和主机的通信手段,以单片机AT89S51作为处理芯片,设计灵活,使用方便可靠,具有锁键的功能,很好地满足了工业现场需求。它具有的通用性使得其能广泛应用于以PC机为主机的控制系统中。     

移动计算机远程操作台设计与实现

介绍一种用单片机实现的移动计算机远程操作控制台设计方法。该操作台可以直接使用计算机标准PC键盘和显示器，实现计算机远距离无线操作，适用于实验室内移动目标的研究工作。     

纳米TiO_2/SBS/PS复合材料的制备及性能

采用钛酸酯偶联剂对 Ti O2 进行表面处理并与聚苯乙烯 ( PS)共混改性。利用红外光谱和透射电镜考察了偶联剂与 Ti O2 之间的相互作用。研究了 Ti O2 的含量、弹性体SBS的含量对复合材料的力学性能和流动性能的影响。结果表明 :纳米级的 Ti O2 在 PS树脂中具有较好的分散性 ,对 PS有增韧作用 ,且 SBS/Ti O2 /PS三元体系的性能要优于Ti O2 /PS和 SBS/PS二元体系 ;同时 ,纳米级的 Ti O2 可改善 PS的流动性能     

负荷模型参数辨识的粒子群优化法及其与基因算法比较

粒子群优化法(PS算法)具有全局性能好、搜索效率高等优点。文中应用该算法进行电力系统负荷模型的参数辨识，并将其与模拟进化算法进行比较，发现PS算法在计算时间、全局性方面均有比较明显的优势。讨论了PS算法中用以调节全局搜索和局部搜索关系的权重ω与搜索效率之间的关系，并给出了适用于电力系统负荷参数辨识的ω值。提出了一种利用PS算法的收敛快速性来提高全局性能的工程实用方法，并对工程实例进行辨识，收到了良好效果。     

金隆公司300kt/a扩改工程吹炼工艺方案的论证

本文介绍了铜锍吹炼主要工艺方案 ,重点分析并对比了PS转炉、闪速吹炼炉工艺技术的先进性、可靠性、环境保护、操作实践以及运行情况 ,得出了基本结论 ,为金隆扩建改造工程吹炼工艺方案的选择提供了依据。     

Morphological and chemical studies of pathological human and mice brain at the subcellular level: correlation between light, electron, and nanosims microscopies

Neurodegenerative diseases induce morphological and chemical alterations in well-characterized regions of the brain. Understanding their pathological processes requires the use of methods that assess both morphological and chemical alterations in the tissues. In the past, microprobe approaches such as scanning electron microscopy combined with an X-ray spectrometer, Proton induced X-ray emission, secondary ion mass spectrometry (SIMS), and laser microprobe mass analysis have been used for the study of pathological human brain with limited success. At the present, new SIMS instruments have been developed, such as the NanoSIMS-50 ion microprobe, that allow the simultaneous identification of five elements with high sensitivity, at subcellular spatial resolution (about 50-100 nm with the Cs(+) source and about 150-200 nm with O(-) source). Working in scanning mode, 2D distribution of five elements (elemental maps) can be obtained, thus providing their exact colocalization. The analysis can be performed on semithin or ultrathin embedded sections. The possibility of using transmission electron microscopy and SIMS on the same ultrathin sections allows the correlation between structural and analytical observations at subcellular and ultrastructural level to be established. Our observations on pathological brain areas allow us to establish that the NanoSIMS-50 ion microprobe is a highly useful instrument for the imaging of the morphological and chemical alterations that take place in these brain areas. In the human brain our results put forward the subcellular distribution of iron-ferritin-hemosiderin in the hippocampus of Alzheimer disease patients. In the thalamus of transgenic mice, our results have shown the presence of Ca-Fe mineralized amyloid deposits.     

Distributed NGD active circuit for RF-microwave communication

This paper is aimed to the investigation on innovative distributed negative group delay (DNGD) circuits for RF communication. Thanks to the analogy between the lumped and distributed circuits, NGD circuit topologies were identified. By using the S-parameter theory, analysis and synthesis methods of these topologies are proposed. The DNGD circuits developed are mainly comprised of a transistor combined with a series resistance ended by a stub. Then, synthesis relations enabling to determine the NGD circuit parameters from the desired NGD and gain values are established. As application, an active phase shifter (PS) operating independently with the frequency based on the cascade of PGD and NGD devices was synthesized. First, an NGD PS with transmission phase of (135 ± 5)° around 2.56 GHz over the bandwidth of about 1.02 GHz was obtained. Then, a two-stage DNGD PS exhibiting 90° with ±10° flatness from 4.1 GHz to 6.8 GHz was designed. The DNGD circuit presented can be used in various telecommunication areas notably for correcting RF/numerical signal delays in the RF-microwave analogue-digital devices.     

Microstructure and sliding wear behavior of pseudo-alloy PS45/CuAl8 composite coating sprayed by HVAA technique

A pseudo-alloy PS45/CuAl8 composite coating was sprayed on steel substrate by high-velocity activated arc spraying (HVAA) process. Its sliding wear behavior at room temperature was evaluated by M-2000 wear tester. For comparison, a single CuAl8 coating was also prepared and tested under the same conditions. It is found that the pseudo-alloy composite coating consists of α-Cu and γ-Ni metallic matrix phases together with homogenously distributed minor Al 2 O 3 , Cr 2 O 3 oxide phases. Moreover, pseudo-alloy coating possesses much better sliding wear resistance than CuAl8 coating due to the enhanced hardness and microstructural homogenization. Fatigue wear and abrasive wear are responsible for the wear-down mechanism of the pseudo-alloy coating.     

某移动TD-SCDMA网络ATU测试FTP掉线问题分析

本文通过对一个ATU数据业务测试的异常事件的分析,介绍了网络总体构架和系统功能,给出了适合的分析方法及具体解决方案,对以后解决类似的问题起到了一定的帮助作用。     

Performance optimization of integrated gas and power within microgrids using hybrid PSO–PS algorithm

In this paper, a hybrid algorithm consisting of particle swarm optimization and pattern search algorithm is proposed to evaluate and optimize the design and operation of microgrids (MGs) in combined gas and power networks. Key performance indicators (KPIs) are modeled and proposed to evaluate and assess MGs. The paper begins by proposing a comprehensive study to define KPIs, which are used to evaluate the following MG parameters: economical efficiency, reliability, environmental conservation, and power quality. Multi‐objective evaluation functions are then developed by building a relationship matrix of MG and KPI components. The results are then displayed as optimized power generation percentages for each technology with values for four KPI categories: cost, quality, reliability and environmental friendliness. Two case studies are examined in this paper; both the province of Ontario and Toronto regional zone under all system parameters with varying percentage of generation via gas technology. Results indicated that the optimal scenario for both Ontario and Toronto was achieved at hybrid PSO–patern search percentage generation via gas technology with improved cost KPI and other KPIs remaining approximately constant. Copyright © 2016 John Wiley & Sons, Ltd.