全IP电视直播节目的即时回看技术

介绍了已运用于实践中的一种全IP电视直播节目即时回看技术,用户通过遥控器一键实现直播节目的即时回看,极大地提升了用户的观看体验。通过在临汾市智慧广电全IP融合业务网建设实践项目中的使用,技术的先进性和有效性得到实践验证。     

Combining a new baseboard radiator with a fan coil system for improving heating performance and reduce energy consumption

In the present work, the heating performance of a new system combined with a new modified baseboard radiator and fan coil is investigated. Using longitudinal fins with special geometry and also forced airflow at the end of the system causes that at the lower inlet water temperature compared with the conventional models, higher heat output rate be obtained. The heat output rate of the new modified system is obtained by experimental metrology based on the European Standard No. EN-442. Temperature and velocity distribution in the room space is done by simulation of the modified system in the Flovent software. Computational fluid dynamics (CFD) results are validated against experimental results and there is a good agreement between them. Also, the energy consumption of the system during the winter season is calculated in TRANSYS software. Experimental results show that the heat output rate of a new modified heating system with inlet water temperature in the range of 45–55°C is on average 4.17 times higher compared with the conventional model. CFD simulation also showed that the combined system provides good thermal comfort conditions. Energy consumption of the new system reduced about 13% compared with conventional models.     

Firs-principles investigation of ZrCo and its hydrides

The electronic structures of Zr₈Co₈ and its hydrides have been systematically investigated using the first-principles calculation based on density functional theory. Additionally, the influence of the Ti and Hf doping on the atomic bonding properties of Zr₈Co₈ and its hydrides (Zr₇HfCo₈, Zr₇HfCo₈H, Zr₁₆Co₁₅HfH₄₈, Zr₇TiCo₈, Zr₇TiCo₈H, and Zr₁₆Co₁₅TiH₄₈ compounds) were also studied to provide new insights into the hydrogenation of Zr₈Co₈. The Ti and Hf atoms were occupied the Zr position in the ZrCo alloy, while they were occupied the Co position in the Zr₁₆Co₁₆H₄₈ system. Ti and Hf doping could achieve the purpose of anti-disproportionation. Ti and Hf could weak the Zr–Co bond for the improvement of the hydrogenation performance of Zr₈Co₈, and the covalence of the Co–H bond was higher than that of the Zr–H bond. The existence of a Co–H covalent bond in the crystal is conducive to the hydrogen absorption of Zr₈Co₈ to form Zr₁₆Co₁₆H₄₈. Inhibition of Co–H interaction during Zr₈Co₈ hydrogenation can accelerate the formation of Zr₈Co₈H for the improvement of its hydrogenation performance.     

江淮丘陵区马槽河流域污染源调查分析及治理建议

随着区域城市人口增加和人民生活水平提高，江淮丘陵区中小河流水环境污染问题日益突出，成为区域社会经济发展的主要制约因素之一。本文以位于江淮丘陵区马槽河流域为研究对象，通过资料收集、问卷调查、实地勘察等手段，查明该地区入河污染物指标 COD、氨氮、TN、TP 主要贡献因素及占比，其中生活污染（51%，40%，54%，28%）、面源污染(6%，38%，9%，42%)、畜禽养殖（39%，15%，17%，25%）三类型贡献占比 90%以上，内源污染和水产养殖较少。针对污染源调查结果特征，提出镇区管网完善、农村分散处理、畜禽粪污处理、养殖废水农田消纳、污染缓冲带设置、径流拦截与再利用、河流生态化改造等治理建议，可为今后中小河流污染源调查与治理提供借鉴。     

基于深度EPG的智能导航平台建设

随着三网融合的大力推进以及双向互动业务的大力开展,运营商使用原有简单的EPG不足以支撑开展更多的增值业务,不能主动为用户推荐节目,不能为运营商带来新的收入机会。作为重要的创新能力支撑系统,介绍了江苏有线智能导航平台的设计与应用,为相关广电运营商提供一定的设计参考。     

面向二进制程序的导向性模糊测试方法

为了解决当前模糊测试技术中变异存在一定的盲目性以及变异生成的样本大多经过相同的高频路径的问题，提出并实现了一种基于轻量级程序分析技术的二进制程序模糊测试方法。首先对目标二进制程序进行静态分析来筛选在模糊测试过程中阻碍样本文件深入程序内部的比较指令；随后对目标文件进行插桩来获取比较指令中操作数的具体值，并根据该具体值为比较指令建立实时的比较进度信息，通过比较进度衡量样本的重要程度；然后基于模糊测试过程中实时的路径覆盖信息为经过稀有路径的样本增加其被挑选进行变异的概率；最后根据比较进度信息并结合启发式策略有针对性地对样本文件进行变异，通过变异引导提高模糊测试中生成能够绕过程序规约检查的有效样本的效率。实验结果表明，所提方法发现crash及发现新路径的能力均优于模糊测试工具AFL-Dyninst。     

二次侧非能动余热排出系统流动不稳定性研究

二次侧非能动余热排出（ASP）系统是压水堆核电厂应对全厂断电事故的重要措施之一。为研究ASP系统的运行特性，设计建造了ASP系统试验装置（ASPTF）。在ASPTF上开展了ASP系统运行稳定性影响试验，并对试验结果进行了理论分析。试验研究与理论分析结果表明：低压低功率下ASP系统中出现流动不稳定性；增加蒸汽管线或回水管线阻力系数可抑制ASP系统出现流动不稳定性；降低加热功率时ASP系统更易出现流动不稳定性；主泵运行状态影响ASP系统的输入功率进而影响系统的流动不稳定性。     

An unsafe behaviour formation mechanism based on risk perception

It is commonly acknowledged that human behaviour is implicated in most safety problems. However, research on the formation mechanism of unsafe behaviour remains incomplete. Risk perception is one of the fundamental issues in risk research, and individual risk perception can be identified as a critical antecedent of human behaviour. This study attempts to construct and test a theoretical model to reveal the formation mechanism of unsafe behaviour based on risk perception. First, to lay a solid foundation for the developed new mechanism, several key concepts about risk perception and unsafe behaviour were explained. Second, the formation mechanism of biases in individual risk perception was developed based on psychological distance theory, and the biases in risk perception were subsequently classified. Lastly, an unsafe behaviour formation mechanism was put forward based on risk perception as an explanatory variable. This study is novel in that it uses psychological distance to explore the formation of biases in individual risk perception. Further, the presented work provides a new approach to understanding and explaining the formation mechanism of human unsafe behaviour.     

Numerical investigation of gelled crude oil particle melting in water for hydrogen production

This paper describes a numerical analysis of the melting process of gelled crude oil in water for hydrogen production. The melting characteristics of crude oil particles are analyzed, and the influence of flow velocity, particle radius, and hot water temperature on the melting process is discussed. The results indicate that the melting rate on the surface of the crude oil is different, the oil particles do not melt concentrically, and the monitoring points and rate of increase in temperature are not substantially affected by the phase change interval. The flow rate and particle radius are found to have a significant influence on the phase distribution of the oil droplets, but changes in water temperature have little effect. After validating a model of the melting process, we investigate the influence of oil particle size, water temperature, flow rate, and oil temperature. It is found that increases in water temperature and flow rate, or a decrease in oil particle size, tend to reduce the melting time.     

氯碱企业快速熔断器运行状况调查报告

以2018年58家氯碱企业供电、整流技术与设备现状调查数据为依据,阐述了国内氯碱企业中快速熔断器的运行状况。调查数据中包括50家氯碱企业的快速熔断器的基本运行数据、投运时间及设备来源等。汇总了各企业在氯碱生产中使用快速熔断器时遇到的问题、发生的故障甚至酿成的生产事故及对氯碱生产造成的影响。并分析了事故发生的原因,提出了预防及解决措施,总结了事故处理经验,旨为氯碱生产提供参考依据。