Electro-sorption of ammonium by a modified membrane capacitive deionization unit

A modified membrane capacitive deionization (MCDI) unit with additional flow channels in the anode and cathode chambers was used to study the performance of ammonium ion removal. The influences of operating parameters including initial ammonium concentration, flow rate and applied potential and the effect of flow in the anode and cathode chambers were investigated. Flow through the anode and cathode chambers significantly enhanced the electro-sorption efficiency. The electro-sorption of ammonium at 5 mL/min was about 65% greater than without flow.     

Combined effects of the filling ratio and the vapour space thickness on the performance of a flat plate heat pipe

An experimental study of a flat plate heat pipe (FPHP) is presented. Temperature fields in the FPHP are measured for different filling ratios, heat fluxes and vapour space thicknesses. The system is hermetically sealed with a transparent plate for meniscus curvature radius observations by confocal microscopy. Experimental results show that the liquid distribution in the FPHP - and thus its thermal performance - depends strongly on both the filling ratio and the vapour space thickness. A small vapour space thickness induces liquid retention and thus reduces the thermal resistance of the system. Nevertheless, the vapour space thickness influences the level of the meniscus curvature radii in the grooves and hence reduces the maximum capillary pressure. As a result, it has to be carefully optimised to improve the performance of the FPHP. In all the cases, the optimum filling is in the range one to two times the total volume of the grooves. A theoretical approach, in non-working conditions, has been developed to model the distribution of the liquid inside the FPHP in function of the filling ratio and the vapour space thickness.     

索风营水电站引水发电系统地下硐室群施工期安全监测

介绍索风营水电站引水发电系统地下硐室群的施工期安全监测状况,对监测成果进行了整理与分析,分析评价了分层开挖施工过程与硐室围岩变形监测成果的影响因素关系,与其他已建工程的监测资料进行对比分析,对索风营水电站地下厂房的围岩稳定性作了初步评价.     

A RANS flamelet-progress-variable method for computing reacting flows of real-gas mixtures

This paper provides an efficient numerical method for solving reacting flows of industrial interest in the presence of significant real-gas effects. The method combines a state-of-the-art solver of the Reynolds-averaged Navier-Stokes equations - equipped with the low-Reynolds number k-ω turbulence closure - with a combustion flamelet-progress-variable approach. A real-gas model as well as a detailed kinetic scheme are used to generate the flamelet library. The method is tested versus several applications chosen to demonstrate the importance of the real-gas effects and of the kinetic scheme for computing high-pressure combustion. The major contribution of the paper is to provide a single-phase approach which solves turbulent reacting real-gas flows at a computational cost comparable with that of the simulation of a non-reacting flow thanks to the use of the flamelet library.     

洪屏抽水蓄能电站地下厂房洞室群渗控措施效果评价

洪屏抽水蓄能电站地下厂房地质条件复杂,洞室较多,为检验现有的防渗排水措施的预期渗控效果,利用改进的节点虚流量法求解有自由面的无压渗流问题,采用改进的排水子结构法模拟排水孔,通过计算正常运行工况、降雨入渗、改变排水孔间距等控制性因素,分析了不同条件下地下厂房渗流场的工作状态。结果表明,现有的防渗排水系统合理,可达到预期渗控效果。     

Echo chambers online?: Politically motivated selective exposure among Internet news users1

A review of research suggests that the desire for opinion reinforcement may play a more important role in shaping individuals’ exposure to online political information than an aversion to opinion challenge. The article tests this idea using data collected via a web‐administered behavior‐tracking study with subjects recruited from the readership of 2 partisan online news sites (N = 727). The results demonstrate that opinion‐reinforcing information promotes news story exposure while opinion‐challenging information makes exposure only marginally less likely. The influence of both factors is modest, but opinion‐reinforcing information is a more important predictor. Having decided to view a news story, evidence of an aversion to opinion challenges disappears: There is no evidence that individuals abandon news stories that contain information with which they disagree. Implications and directions for future research are discussed.     

百色水利枢纽地下洞室开挖安全管理

介绍百色水利枢纽地下厂房工程洞室群开挖期的安全管理情况及安全管理的一些做法 ,安全是地下洞室施工的关键 ,百色水利枢纽地下厂房工程开挖基本结束 ,面对复杂不利的地质条件 ,通过切实有效的安全生产管理 ,未发生重大安全事故     

Dosimetry with a recombination chamber in outdoor conditions and at low dose rates

A system with a recombination chamber for outdoor dosimetry in mixed radiation fields is proposed. The chamber works as a passive detector, with polarising electrodes supplied from capacitors permanently connected to the electrodes. Ions, collected on the measuring electrode, charge a measuring capacitor, also permanently connected to the electrode. A special procedure, including recharging of the supplying capacitors, was introduced in order to compensate the side charge caused by changes of ambient temperature and leakage of the electrical charge from the supplying capacitors. Experimental tests indicated that the chamber of REM-2 type or a specially designed KR-20 chamber could also be used at low dose rates. It was possible to measure the ambient dose of a fraction of μGy with accuracy of about 10%, and the H*(10) of about 1 μSv, with accuracy better than 25%, in any field of penetrating radiation, provided the time of charge collection is less than 24 h.     

不宜用“消声室的截止频率”这一称谓（史丽丽约）

《》S 吸声尖劈的“截止频率”是指吸声系数大于、等于99%的最低频率,这是清楚的。但要说“消声室的截止频率”,那就不合适了。     

NVH试验室的设计浅析

根据国内汽车行业对NVH重视的提升及国民对整车乘坐舒适性要求的提高,NVH试验室的建设将对整车NVH性能提升起着至关重要的作用。介绍了消声室的主要技术指标和影响消声室技术指标的主要结构,阐述了NVH试验室建设的主要指标。建成后的NVH试验室将缩短产品开发周期、提高试验的精准度、提供安全测试环境、适应新产品的开发需求及提升试验验证能力。