消防战勤保障体系建设的思考

随着经济的发展,消防救援队伍承担的任务越来越繁重.重大灾害事故的发生,对消防战勤保障方面提出了更高的要求.文章主要从消防战勤保障的主要任务职能、消防战勤的任务分类以及消防战勤保障体系建设存在的问题与建议等几个方面进行了详细的阐述,以期消防战勤保障得到更好的发展.     

Kinetics and mechanistic studies of methane dry reforming over Ca promoted 1Co–1Ce/AC-N catalyst

The mechanism and kinetic features of dry reforming with methane (DRM) over Ca promoted 1Co–1Ce/AC-N catalyst was investigated. The mechanistic pathway studies have conducted by FTIR and XPS analysis, structure-activity correlations demonstrated the CH₄ and CO₂ could adsorb on catalyst active sites and generate intermediate CH_x, OH and CH_xO, continue to generate CO and H₂ and then desorbed from active sites. Moreover, CH₄ could also oxidized by Ce⁴⁺ and CO₂ reduced by Ce³⁺, the same content of Ce⁴⁺ and Ce³⁺ on promoted catalyst greatly improved the reaction rate. The kinetic of dry reforming with methane was examined for temperature between 650 and 850 at 800 °C. The research was carried out by changing the CH₄/CO₂ ratios between 0.3 and 3.0. The obtained experiment data were fitted by three typical kinetic models (Power Law, Eley-Rideal and Langmuir-Hinshelwood), the fitting results demonstrated that the best prediction of reforming rates can provided by Langmuir-Hinshelwood model for the reaction temperatures between 650 and 800 °C. Moreover, activation energies of methane and carbon dioxide consumption were ?117 and ?47 kJ/mol, indicating that much higher energy barrier is needed for methane activation compared to carbon dioxide.     

联合循环中旁路系统蒸汽流量计算及其应用

高/低压蒸汽旁路流量精确控制是提高联合循环电厂灵活性的重要部分,在旁路阀厂家提供资料不完善的情况下,通过研究阀门实际的流动特性,简化了阀门流动模型,参照相关的阀门流量计算经验公式,对其中一些系数进行近似处理,最终根据旁路的设计数据表拟合出旁路流量计算公式并对其进行应用验证,100%甩负荷时高压蒸汽系统压力上升变化仅有2%,满足了约旦侯赛因燃气-蒸汽"三拖一"联合循环机组的运行要求,可为其他电厂在旁路系统控制及提高电厂灵活性方面提供借鉴。     

基于工业机器人的涡旋压缩机智能生产线的设计

为提高涡旋压缩机的生产效率和生产精度,设计了一种融合2台工业机器人、3台数控机床的智能生产线.首先,构建了包含数控机床、工业机器人、PLC、工业视觉等设备的智能生产线硬件系统;然后,提出了PLC控制工业机器人实现高效作业的优化方法;最后,设计了两套工业机器人多功能末端工具,并对工业机器人进行示教与编程,实现动涡旋和静涡旋生产作业.实验表明,该系统平均每170 s可生产2个动涡旋和2个静涡旋,质量检测正确率高,生产效率高,符合实际生产应用.     

Nymphoides peltatum as a novel feedstock for biomethane production via anaerobic co-digestion with waste sludge

Nymphoides peltatum (NP) is exploited as a novel feedstock for biomethane production via anaerobic co-digestion with waste sludge (WS). Batch experiments are conducted under mesophilic condition at NP/WS of 1/3, 2/2, 3/1, 0/4 and 4/0 based on volatile solids (VS). Prior to anaerobic digestion (AD), NP undergoes only natural drying and grinding. The maximum net cumulative methane yield (265.16 mL CH₄·g VS_added^?1) and the highest gross VS removal rate (56.12%) are obtained at NP/WS of 1/3. The kinetic analysis by the modified Gompertz model fit hinted that 28 days is adequate for methane recovery and co-digestion significantly accelerates the digestion rate. Synergetic effect is corroborated to exist in co-digestion due to amiable conditions in term of total ammonia nitrogen, free ammonia, pH, volatile fatty acids and total alkalinity. High-throughput 16S rRNA pyrosequencing reveals that Bacteroidetes, Firmicutes, Methanosarcina and Methanosaeta are conducive to AD of NP.     

日本被动式租赁住房规划设计研究

文章从项目的缘起、规划设计、思想理念及被动技术等方面对日本优秀被动式租赁住房案例PassiveTown进行分析,进一步了解了日本被动式技术在租赁住房规划设计中的应用.     

Rich QR code with three-layer information using visual secret sharing scheme

Multimedia Tools and Applications - Owing to efficient machine recognition, QR codes have been widely used in many aspects such as information management, electronic identity and mobile payment....