芦岭煤矿9~#煤层多源多汇采空区自燃预警技术研究

基于分布式光纤测温系统为主,束管气体监测系统、数值模拟为辅的方法,对芦岭煤矿II925工作面瓦斯综合治理条件下多源多汇采空区的温度、气浓度变化规律进行了监测,对采空区流场数值模拟结果进行了分析,对采空区自燃"三带"分布进行了讨论。总结出分布式光纤测温预警系统具有灵敏、可靠、准确、连续性等优点,弥补了束管监测系统单一、无法定位、抽象等缺点,进一步完善了煤矿采空区自燃预警技术,对煤矿防灭火工作具有指导意义。     

Participatory or deliberative democracy? Exploring the mediation effects of perceived online deliberation and online interactive activities on social outcomes

Using the structural equation modeling method (N = 811), this study explores the structural relationships among online news consumption, political participation and social trust, with a focus on the mediating effects of online users’ deliberative perceptions and news-related online interactive activities. The analysis confirms that users’ perceptions of online deliberation exert a significant mediating effect on users’ levels of news consumption, political participation, and social trust. Users’ interactive civic messaging behaviors, on the other hand, solely enhance participatory intentions. The findings also show that the consumption of political news and the consumption of entertainment news have different effects on users’ perceptions of online deliberation, social trust, and political participation. Specifically, while political news has a direct and relatively strong influence on participation, entertainment news has a limited and indirect effect on participation. Online interactive activities are negatively associated with users’ perceived competency for online deliberation. Further implications of the study are also discussed.     

面向云物联网的车辆远程智能监控系统的研究

物联网和云计算使我们进入了网络时代的新阶段。将物联网“物物相连,全面感知”的特征与云平台的“云计算,云存储”能力全面整合,为相关行业形成完整统一的网络服务平台,是互联网 的有效实践方式。针对目前车载监控系统功能相对简单,难以满足将来智能交通对其的系统化、智能化的要求的问题。研究采用物联网技术和云计算理念,实现了面向云物联网的车辆监控信息平台,为车辆的远程智能监控提出了新的发展思路。     

OFDMA认知无线电网络中面向需求的频谱共享

从满足次网络通信需求的角度,设计一个两阶段模型,求解OFDMA 认知无线电网络中频谱租赁与分配问题。模型第1阶段,次基站收集次网络通信需求,向多个主基站租用频谱资源。运用Bertrand博弈对主、次基站的交易行为进行建模,并将纳什均衡作为最终定价方案。第2阶段,基于纳什议价方案,将次基站子载波和功率分配问题定义成非线性规划问题,并通过拉格朗日乘数法进行求解。仿真实验表明,相对于其他频谱共享方案,所提方案高效地满足每个次用户的通信需求。     

太阳能建筑物外观及表面光伏组件铺设优化

针对太阳能建筑物外观图的设计及外表面太阳能光伏组件铺设优化问题,首先通过建立以建筑物5个外表面全年总辐射量最大为目标的单目标规划模型,并考虑建筑物的设计要求,基于模拟退火法给出了建筑物的外观设计图,并根据电池性能的优劣顺序及限制条件,利用贪心算法得到建筑物外表电池铺设方案,最后给出了这种方案下的投资收回年限及寿命期内的经济效益。     

Materials and Wireless Microfluidic Systems for Electronics Capable of Chemical Dissolution on Demand

Electronics that are capable of destroying themselves, on demand and in a harmless way, might provide the ultimate form of data security. This paper presents materials and device architectures for triggered destruction of conventional microelectronic systems by means of microfluidic chemical etching of the constituent materials, including silicon, silicon dioxide, and metals (e.g., aluminum). Demonstrations in an array of home‐built metal‐oxide‐semiconductor field‐effect transistors that exploit ultrathin sheets of monocrystalline silicon and in radio‐frequency identification devices illustrate the utility of the approaches.