DMF生产系统技改总结

N,N-二甲基甲酰胺(DMF)是一种优良的有机溶剂及浆料行业的重要原料。通过十几年的发展,国内DMF生产能力大幅提升,市场竞争日趋激烈。为应对激烈的市场竞争,在DMF生产中对原料、工艺和设备等方面作了大量的技术改造,确保装置稳定运行,并降低了生产成本。     

中国（上海）自由贸易试验区配套服务设施优化探讨--基于对自由贸易试验区现状与需求特征的分析

上海自贸试验区由外高桥保税区、浦东机场保税区和洋山保税港区3大区域组成，作为自贸试验区的主体功能，金融、贸易、会展等商务设施快速发展，建树显著。但与其主体功能相辅的配套服务设施，则由于三区不同的阶段和特征都各不相同，在一定程度上影响着自贸试验区的软实力提升。探讨如何结合自贸试验区的特殊性，从特征分析和需求调查出发，寻求适合于当前需求及发展形势的配套服务优化之路。     

Implementing an emerging mobility model for a fleet of UAVs based on a fuzzy logic inference system

In this paper, we design and implement a novel generic mobility model, named Alpha-based, for a fleet of small interconnected UAVs (Unmanned Aerial Vehicles) that collaborate to explore a geographic area (battle field, research and rescue missions, surveillance applications, etc.). In fact, due to the significant impact of mobility models on the networking performance, the mobility models must realistically capture the UAV’s attributes. Hence, we propose to use a combination of energy level, coverage-area and network connectivity for mobility decision-making, in contrast to the literature where only network connectivity and area coverage are investigated. On the one hand, these two metrics are very important, especially for applications where achieving the best area-coverage and maintaining network connectivity represent an essential requirement. On the other hand, energy is another equally noteworthy constraint that should be taken into account. In fact, being a crucial resource for all mobile devices and especially for UAVs, the energy becomes vital to ensure the network lifetime and mission success. As far as we know, Alpha-based mobility model is the first to ever consider a combination of these three metrics within the same decision-making criterion. A distributed scheme is adopted, where each UAV determines locally its future movement based on the information it receives from its neighbors. Moreover, a novel fuzzy inference system is implemented in order to compute the values of a followship weighting parameter, named Alpha. This latter is used to choose the most suitable neighboring UAV to follow. To validate the proposed mobility model, rigorous testing has been accomplished, through simulation work. Compared to Random-based and Forces-based mobility models, the Alpha-based mobility model achieves good coverage rate while maintaining connectivity.     

Solar powered high voltage energization for vehicular exhaust cleaning: A step towards possible retrofitting in vehicles

This paper proposes a novel way of generating high voltage for electric discharge plasma in controlling NO_x emission in diesel engine exhaust. A solar powered high frequency electric discharge topology has been suggested that will improve the size and specific energy density required when compared to the traditional repetitive pulse or 50 Hz AC energization. This methodology has been designed, fabricated and experimentally verified by conducting studies on real diesel engine exhaust.     

The effects of regeneration-phase CO and/or H2 amount on the performance of a NOX storage/reduction catalyst

The effects of regeneration-phase CO and/or H₂, and their amounts as a function of temperature on the trapping and reduction of NO_X over a model and a commercial NO_X storage/reduction catalyst have been evaluated. Overall, for both catalysts, their NO_X removal performance improved with each incremental increase in H₂ concentration. For the commercial sample, using CO at 200 °C, beyond a small amount added, was found to decrease performance. The addition of H₂ to the CO-containing mixtures resulted in improved performance at 200 °C, but the presence of the CO still resulted in decreased performance in comparison to activity when just H₂ was used. With the model sample, the presence of CO resulted in very poor performance at 200 °C, even with H₂. The data suggest that CO poisons Pt sites, including Pt-catalyzed nitrate decomposition. At 300 °C, H₂, CO, and mixtures of the two were comparable for trapping and reduction of NO_X, although with the model sample H₂ did prove consistently better. With the commercial sample, H₂ and CO were again comparable at 500 °C, but mixtures of the two led to slightly improved performance, while yet again H₂ and H₂-containing mixtures proved better than CO when testing the model sample. NH₃ formation was observed under most test conditions used. At 200 °C, NH₃ formation increased with each increase in H₂, while at 500 °C, the amount of NH₃ formed when using the mixtures was higher than that when using either H₂ or CO. This coincides with the improved performance observed with the mixtures when testing the commercial.     

AN EFFICIENT META-HEURISTIC ALGORITHM FOR ROUTING PRODUCT COLLECTING VEHICLES OF DEHYDRATION PLANTS. II. ALGORITHM PERFORMANCE AND CASE STUDIES

Routing of vehicle fleet for collecting newly cropped raw materials for multi-product dehydration plants is a component of plant production schedule of utmost significance. A meta-heuristic algorithm for efficiently solving the collecting vehicle routing problem was developed and analyzed in detail in Tarantilis and Kiranoudis (2000). Meta-heuristic algorithms are broadly characterized by a stochastic nature in producing tender solution configurations in linear search terms, which sweep the huge solution space in a guided and rational way. Algorithm performance is examined through an analysis of the impact of model parameters on solution procedure during the execution of typical routing problems. The most important model parameter examined was found to be the value of the initial threshold as well as the way that the value of this actual parameter is appropriately adjusted during the optimization process. The main characteristic of the algorithm is the way that threshold is not only lowered but also raised, or backtracked, depending on the success of the inner loop iterations to provide for an acceptable new solution that would replace an older one. An important feature of the algorithm is the fact that appearance of better configurations within a process run is distributed according to the Poisson probability distribution. The suggested algorithm is tested against typical literature benchmarks as well against real-world problem encountered in the production planning procedures of dehydration plants in Greece.     

颗粒铁除铬试验研究

采用批实验方法,研究颗粒铁（铁屑）加入量、Cr（Ⅵ）初始浓度及阴离子组分对颗粒铁去除铬动力学影响。结果表明,在室温条件下（24℃±2℃）,不调节溶液的pH值,铁能很快去除水中的铬;随颗粒铁加入量的增加、初始Cr（Ⅵ）浓度的减少,颗粒铁对铬去除增强,较高浓度时,氯离子、硫酸根离子和重碳酸根离子对颗粒铁除铬有适度的增强;低浓度时,HCO3^-轻微减弱颗粒铁对Cr（Ⅵ）的去除。探讨了各因素对铬去除的影响机理。     

援津巴布韦高清电视转播车视音频系统介绍

本文介绍了我国援助津巴布韦国家电视台高清电视转播车视音频系统的设备选型、系统设计思路。津巴布韦国家电视台目前主要采用标清和模拟系统设备,我国援助的高清转播车,实现了高清、标清的充分兼容,系统可扩展,实用、灵活、安全性。视频系统具有强大的备份功能,包括切换台和矩阵的相互备份,主备调音台的应急备份及录像机的应急备份等。     

基于Hadoop的分布式视频车辆检索方法*

针对传统单机视频检索效率低下的问题,设计了一种基于Hadoop的分布式视频车辆检索方法。该方法首先将视频切割成多个分块,然后利用MapReduce和FFMPEG在分布式环境下提取视频帧,再通过车牌识别算法检索其中出现的车牌号码,最后计算出车辆在视频中出现的时间。实验结果表明,与单机检索方式相比,该方式具有更强的数据处理能力和更高的检索效率。