Hydrogen production through dry reforming of biogas using a porous electrochemical cell: Effects of a cobalt catalyst in the electrode and mixing of air with biogas

This paper reports the performance of porous Gd-doped ceria (GDC) electrochemical cells with Co metal in both electrodes (cell No. 1) and with Ni metal in the cathode and Co metal in the anode (cell No. 2) for CO₂ decomposition, CH₄ decomposition, and the dry reforming reaction of a biogas with CO₂ gas (CH₄ + CO₂ → 2H₂ + 2CO) or with O₂ gas in air (3CH₄ +?1.875CO₂ +?1.314O₂ → 6H₂ +?4.875CO +?0.7515O₂). GDC cell No. 1 produced H₂ gas at formation rates of 0.055 and 0.33?mL-H₂/(min?m²-electrode) per 1?mL-supplied gas/(min?m²-electrode) at 600?°C and 800?°C, respectively, by the reforming of the biogas with CO₂ gas. Similarly, cell No. 2 produced H₂ gas at formation rates of 0.40?mL-H₂/(min?m²) per 1?mL-supplied gas/(min?m²) at 800?°C from a mixture of biogas and CO₂ gas. The dry reforming of a real biogas with CO₂ or O₂ gas at 800?°C proceeded thermodynamically over the Co or Ni metal catalyst in the cathode of the porous GDC cell. Faraday's law controlled the dry reforming rate of the biogas at 600?°C in cell No. 2. This paper also clarifies the influence of carbon deposition, which originates from CH₄ pyrolysis (CH₄ → C + 2H₂) and disproportionation of CO gas (2CO → C + CO₂), on the cell performance during dry reforming. The dry reforming of a biogas with O₂ molecules from air exhibits high durability because of the oxidation of the deposited carbon by supplied air.     

雍正粉彩陶瓷装饰艺术特色

阐述了粉彩尤其雍正粉彩装饰工艺特色，肯定了雍正粉彩瓷在中国陶瓷发展史上的贡献和地位，对清三代古瓷研究具一定参考价值。     

In situ growth of NiSe2 nanocrystalline array on graphene for efficient hydrogen evolution reaction

Nickel selenide electrocatalysts for hydrogen evolution reaction (HER) with a high efficiency and a low-cost have a significant potential in the development of water splitting. However, the inferiority of the high overpotential and poor stability restricts their practical applications. Herein, a composite nanostructure consists of ultrasmall NiSe₂ nanocrystals embedded on graphene by microwave reaction is reported. The prepared NiSe₂/reduced graphite oxide (rGO) electrocatalyst exhibited a high HER activity with an overpotential of 158 mV at a current density of 10 mA/cm² and a corresponding moderate Tafel slope of 56 mV/dec in alkaline electrolyte. In addition, a high retention of electrochemical properties (approximately 100%) was demonstrated with an unchangeable microstructure after 100 h of continuous operation.     

An assessment into the characteristics of award winning papers at CHI

Scientometrics - The overall readability of CHI publications is not known. In addition, little is understood about what lexical or demographic characteristics are unique to award winning papers at...     

黄连木油的提取及其制备生物柴油的研究

研究了黄连木油的提取条件和以黄连木油制备生物柴油的工艺.结果表明:油提取最佳条件:石油醚体积与种籽质量比5:1,反应时间为2 h,反应温度为70℃,黄连木得油率为31.8%;应用L9(34)正交试验得出黄连木油酯交换反应的最佳条件为:油醇物质的量比1:6、催化剂用量为油质量的1.2%、反应时间2 h、反应温度60℃,转化率为96.0%.并对生物柴油性能指标进行了检测,它与0#柴油的主要性能指标相接近,它是一种理想的0#柴油的替代品.     

Highly Efficient Nonvolatile Magnetization Switching and Multi-Level States by Current in Single Van der Waals Topological Ferromagnet Fe3GeTe2

Robust multi-level spin memory with the ability to write information electrically is a long-sought capability in spintronics, with great promise for applications. Here, nonvolatile and highly energy-efficient magnetization switching is achieved in a single-material device formed of van-der-Waals (vdW) topological ferromagnet Fe₃GeTe₂, whose magnetic information can be readily controlled by a tiny current. Furthermore, the switching current density and power dissipation are about 400 and 4000 times smaller than those of the existing spin-orbit-torque magnetic random access memory based on conventional magnet/heavy-metal systems. Most importantly, multi-level states, switched by electrical current are also demonstrated, which can dramatically enhance the information capacity density and reduce computing costs. Thus, the observations combine both high energy efficiency and large information capacity density in one device, showcasing the potential applications of the emerging field of vdW magnets in the field of spin memory and spintronics.     

Adaptive Social Robot for Sustaining Social Engagement during Long-Term Children–Robot Interaction

One of the known challenges in Children–Robot Interaction (cHRI) is to sustain children’s engagement during long-term interactions with robots. Researchers have hypothesized that robots that can adapt to children’s affective states and can also learn from the environment can result in sustaining engagement during cHRI. Recently, researchers have conducted a range of studies where robots portray different social capabilities and have shown that it has positively influenced children’s engagement. However, despite an immense body of research on implementation of different adaptive social robots, a pivotal question remains unanswered: Which adaptations portrayed by a robot can result in maintaining long-term social engagement during cHRI? In other words, what are the appropriate and effective adaptations portrayed by a robot that will sustain social engagement for an extended number of interactions? In this article, we report on a study conducted with three groups of children who played a snakes and ladders game with the NAO robot to address the aforementioned question. The NAO performed 1) game-based adaptations, 2) emotion-based adaptations, and 3) memory-based adaptation. Our results showed that emotion-based adaptations were found out to be most effective, followed by memory-based adaptations. Game adaptation didn’t result in sustaining long-term social engagement.     

节能型自动电源切换系统的应用

在配有油机做备用电源的基站中,对油机发电、基站供电的切换需安全、高效的管理。节能型自动电源切换系统通过将智能切换控制器与动力环境监控系统相结合,完成了对市电、蓄电池、油机的统筹控制,实现了基站供电切换的远程监控,可很大程度地保证基站供电的持续性和油机运行的安全性,降低油机能耗,减少运维工作量。     

ELECTROCHEMICAL BEHAVIOUR OF PHASES IN TITANIUM ALLOYS

测定钛合金在氢氟酸、硝酸、柠檬酸水溶液中的阳极极化曲线,研究其组成相的电化学行为。证实电化学行为的差异是各相化学成分和点阵类型不同所致。在活化区内以α相和α′相的腐蚀为主;而在过钝化区以β相腐蚀为主。