FPGA技术在数字演播室传输系统中的应用

随着高清技术的不断进步与发展,数字箱载演播室也在向着高清的应用发展。然而由于高清视频码流的高速率,传统的三同轴传输技术不再适应。光纤传输是一个选择,但是光纤不仅成本高,而且在移动中比较容易损坏。对于一些低成本用户,光纤技术显然是不适用的。文章提出了一种经济适用的传输方式,传输质量也满足演播室的要求。这种传输方式在FPGA中都已经得到实现。系统运行稳定、音视频质量好且成本低。     

PLC的大型牵伸卷绕机的应用研究

本文介绍了大型牵伸卷绕机的计算机控制系统，以西门子MMV型变频器为驱动装置，西门子PLC300为控制核心，根据西门子USS协议和MPI协议，实现PLC与变频器、TP27触摸显示屏的通信，取得了较高的控制精度和稳定性，充分满足生产过程的需要，具有广阔的应用前景。     

The preparation of heparin-like hyperbranched polyimides and their antithrombogenic,antibacterial applications

1,3,5-Tris(4-aminophenoxy) benzene (TAPOB) and 2,2-bis [4-(3,4-dicarboxyphenoxy) phenyl] propane dianhydride (BPADA) were used to synthesize an amino-terminated hyperbranched polyimide (AM-HBPI). Then, the 2-methacryloyloxyethyl phosphorylcholine-modified hyperbranched polyimide (HBPI-MPC) was obtained through the graft modification of MPC onto AM-HBPI by Michael addition. The infrared spectroscopy and X-ray photoelectron spectroscopy spectra showed MPC molecules were successfully grafted onto the HBPI molecules. The HBPI-MPC films exhibited slightly decreased thermal stabilities with 5% weight loss temperature in the range of of 418–483?°C in nitrogen, compared with the pure HBPI film. With the increase of MPC grafting amount, the static water contact angles decreased from average 84.0° of the pure HBPI film to average 45.0° of the HBPI-MPC film with 20% MPC. Meanwhile, the increased surface roughness of the HBPI-MPC films increased the contact areas with the platelets, enhancing their anticoagulant efficiency. The number of platelet adhesion declined and the shape of platelet changed from flat to round. The recalcification times grew from average 300?s of pure HBPI to average 551?s of the HBPI-MPC film with 20% MPC, indicating improved anticoagulant properties and biocompatibility. Bacterial adhesion test also demonstrated the number of bacterial adhesion was significantly reduced and antibacterial properties were improved. Thus, the HBPI-MPC films have great application prospects as biomedical anticoagulant materials.

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A complete miniaturized microstructured methanol fuel processor/fuel cell system for low power applications

A complete miniaturized methanol fuel processor/fuel cell system was developed and put into operation as compact hydrogen supplier for low power application. The whole system consisting of a micro-structured evaporator, a micro-structured reformer and two stages of preferential oxidation of CO (PROX) reactor, micro-structured catalytic burner, and fuel cell was operated to evaluate the performance of the whole production line from methanol to electricity. The performance of micro methanol steam reformer and PROX reactor was systematically investigated. The effect of reaction temperature, steam to carbon ratio, and contact time on the methanol steam reformer performance is presented in terms of catalytic activity, selectivity, and reformate yield. The performance of PROX reactor fed with the reformate produced by the reformer reactor was evaluated by the variation of reaction temperature and oxygen to CO ratio. The results demonstrate that micro-structured device may be an attractive power source candidate for low power application.     

输电线路全寿命周期成本设计

全面贯彻全寿命周期理念,详细分析了输电线路全寿命周期成本(life cycle costs,LCC)的组成、计算方法和计算步骤.以500 kV输电线路为例,详细计算了导线、绝缘子、直线塔、塔材、基础、路径方案等主要部件的LCC,而不是只考虑一次投资,并全面考核各设计方案的技术经济性,最后提出了技术和经济上最优的推荐设计...     

一个面向新的财务制度的微机综合财务管理网络系统

介绍了一个面向新的财务制度的微机综合财务管理网络系统,描述了系统的基本功能和结构,并结合系统提供的良好人—机界面分析了它的实用性。     

湿法制备羟基磷灰石生物活性陶瓷粉末的热力学分析

本文对制备羟基磷灰石（ＨＡ）的Ｃａ（ＮＯ３）２－（ＮＨ４）２ＨＰＯ４－ＮＨ４ＯＨ－Ｈ２Ｏ体系进行热力学分析。计算求得ＨＡ沉淀最宜ｐＨ条件为１０．６－１２．４，热力学计算与实验结果和文献报告数据结果一致。     

汽车姿态的离散性半主动控制

在线性最优控制理论的基础上，采用轴间预瞄技术和Ｐａｄｅ近似方法，建立考虑前、后车轮下路面不平度输入相关性的汽车半主动悬架系统动力学模型和控制律，以优化连续阻尼和部分系统动态响应量作为参数，构造半主动悬架系统的离散优化阻尼控制律。提出的半主动悬架控制方法能改善乘坐舒适性，并能较好地抑制离散化控制中存在的高频震颤     

锅炉蒸发系统动态数学模型的建立

针对大型火电机组仿真装置中的锅炉蒸发系统，采用神经元网络给出了动态数学模型的建模方法．根据某一２００ＭＷ火电机组实测数据．完成了该锅炉蒸发系统的建模工作。仿真结果证明了该方法的有效性．     

STUDY OF ARTIFICIAL EYES HAVING HIGH STRENGTH AND LOW DENSITY

The artificial eyes having high strength , law density and natural movement, which are made from hydroxyapatite and bioactive glass have been utilized effectively in clinic. The technology of compounding hydroxyapatite, melting bioactive glass and making the artificial eyes are stated in this paper. In animal test, the bioactivity and biocompatibility of the material making the artificial eyes are examined by histological observation, SEM XRD and electronic probe. At the same time, application of the artificial eyes in clinic are also introduced.