基于TCP/IP的多数据流传输测控系统的设计与实现

为保证子测控设备的独立测量、状态监控和实时数据的同步传输,设计基于TCP/IP的多数据流传输测控系统,对需求参数进行测量,采用基于多重事件的网络通信技术、数据采集技术及基于队列的多数据同步处理技术,利用现有的局域网资源,实现设备的控制,实现数据的实时获取、存储,数据流整合,实现信息、资源及任务的综合共享及管理。该系统经长期运行,稳定可靠,达到了设计的要求。     

分时体制多目标干扰系统干扰资源综合管控

针对先进战机分时体制干扰系统多目标干扰时的资源管理问题, 采用多属性决策方法建立了目标威胁等级评估模型, 并运用折中排序法(VIKOR)对目标威胁等级进行偏序处理, 重新整合了干扰任务请求队列; 从空间域、频率域、能量域和时间域4个方面综合分析了干扰资源的限制条件并对干扰效果进行了定量描述; 最后提出了分时体制干扰系统多目标干扰资源管理算法。偏序处理后干扰任务请求队列的整合与干扰时机、参数的控制可以有效提高干扰系统的效率, 提升干扰系统的智能化水平。     

Developing Smart Grids Based on GPRS and ZigBee Technologies Using Queueing Modeling–Based Optimization Algorithm

Smart metering systems have become widespread around the world. RF mesh communication systems have contributed to the creation of smarter and more reliable power systems. This paper presents an algorithm for positioning GPRS concentrators to attain delay constraints for a ZigBee‐based mesh network. The proposed algorithm determines the number and placement of concentrators using integer linear programming and a queueing model for the given mesh network. The solutions given by the proposed algorithm are validated by verifying the communication network performance through simulations.     

棒状V3O7?H2O电极材料的制备及印刷超级电容器

以五氧化二钒（V2O5）为原料,利用溶剂热法一步制备一水合七氧化三钒（V3O7?H2O）纳米棒,以V3O7?H2O纳米棒为电极材料,探究丝网印刷工艺对电极电化学性能的影响,结合丝网印刷制备电极并组装超级电容器。采用SEM、EDS、XPS、FTIR等对样品的形貌与结构进行表征,结果表明已成功制备V3O7?H2O纳米棒。在电化学测试中,丝网印刷电极比电容可达268.0 F/g（电流密度为0.3 A/g）,经过5000次循环后比电容保持率85.9%,优于涂抹电极的比电容（246.0 F/g）和比电容保持率（68.0%）,这得益于丝网印刷的油墨规则排列的结构。此外,组装的纽扣超级电容器同样表现出优异的电化学性能,比电容和电容保持率为134.2 F/g（0.5 A/g电流密度）和91.2%（5000次充放电循环）,且当功率密度为413.0 W/kg时,能量密度最高可达22.0 W?h/kg。本研究为后续印刷储能器件的研究提供了一条可供借鉴的思路。     

浮法玻璃生产中划伤与辊印的讨论

针对浮法玻璃生产中退火工段的玻璃品质问题,从退火系统的设计、安装、升温、生产到工艺的调整来对划伤和辊印进行讨论。     

有限次休假的M/G/1排队模型研究

研究了有限次休假的M／G／1排队模型中系统的稳态平衡条件，系统的队长，顾客的延误时间等排队指标。     

育果袋纸生产工艺改造及成本分析

与传统育果袋纸生产方法相比,采用印刷法生产育果袋纸具有生产效率高、环境友好等特点.在前期研究基础上,本文探讨了印刷法生产育果袋纸工艺设备的改造方案,可实现育果袋纸原纸生产与后续印刷过程连续化的目的.此外,还对以不同原料采用传统生产工艺——层合法制备育果套袋纸和以OCC为原料采用印刷法制备育果套袋纸的生产成本进行了比较.改造结果表明:无论采用圆网纸机或长网纸机,通过对设备进行简单地调整或增加印刷单元,即可实现印刷法育果套袋纸工艺的连续化生产;原料成本核算结果表明:以废旧瓦楞纸板纸浆为原料采用印刷法制备育果袋纸,其成本虽与传统方法相当,但却提高了生产效率,降低了环境污染.因此,若在今后的研究中,能够研究开发出适合育果袋纸生产的低成本油墨,对于育果袋纸产业而言具有较大的借鉴意义.     

陶瓷材料与结构增材制造技术研究现状

增材制造技术在聚合物材料与结构、金属材料与结构制备中已经得到了大量应用。近年来,陶瓷材料与结构的增材制造技术得到了初步发展,受到了越来越多陶瓷工作者的关注。本文综述了目前几种常见的陶瓷材料与结构增材制造技术,并预测了未来陶瓷材料与结构增材制造技术发展的主要关注点,以期为陶瓷工作者提供关于增材制造技术一定的参考与思考。     

A comprehensive study on the droplet formation processes and its influencing factors of a tubular piezoelectric print head

Abstract

Various inks with different properties are widely used in the printed electronic industry. In order to obtain high quality inkjet printing, it is necessary to study the droplet formation process and its influencing factors comprehensively. Only in this way, the incentive conditions and liquid physical parameters of droplet ejection can be obtained and optimized. Firstly, the calculation model of the droplet ejection process is established for a tubular print head and the boundary conditions are set according to the driving characteristics. Secondly, the free surface flow is calculated in the simulation software and sequential pictures of the droplet formation processes are captured to validate the availability of the numerical algorithm. Finally, the droplet formation processes of the tubular piezoelectric print head are simulated under different incentive conditions, different viscosities and different surface tensions. Too small a driving energy is insufficient to cause the head to eject droplets. Excessive excitation energy will result in larger or multiple satellite droplets. Additionally, the thinning process of the liquid neck is examined carefully in this paper. Results show that surface tension and viscosity have a significant effect on the thinning speed of the liquid neck, but the effect is not as significant as previous studies.