Electrocatalytic Performances of Carbon Nanotube Air Electrode for Oxygen Reduction

　以不同质量比的铂、纳米碳管、活性碳为催化层制备空气电极并测定其稳态极化曲线和交流阻抗.研究发现,纳米碳管经硝酸处理后其氧还原反应性能得到提高,特别是将表面氧化后再沉积Pt,对氧的电还原反应影响更显著.以质量比4∶1的活性碳/纳米碳管载Pt制备的空气电极,在过电位ηc为500～600mV下,氧还原电流可达600～700mA·cm-2.EIS测试表明,纳米碳管载Pt后的欧姆极化阻抗和电化学阻抗均非常小.The air electrodes with different mass ratio of Pt/active carbon or carbon nanotube as catalyst layer material have been prepared. The electrocatalytic performances for oxygen reduction were evaluated by means of polarization curve and electrochemical impedance spectroscopy (EIS). The results disclosed that carbon nanotubes dealt with nitric acid in the catalyst layer had been improved obviously on the electrocatalytic activity. After the surface of carbon nanotube was oxygenated and aggraded with platinum, the catalyst had obviously effects on the electrocatalytic activity. The air electrode with the mass ratio of active carbon to Pt/carbon nanotube in 4∶1 showed better electrocatalytic activity, e.g., the output current density reached 600～700 mA cm~(-2) when the overpotential was 500～600 mV. The EIS showed that the addition of Pt/carbon nanotube in the catalyst decreased greatly ohmic and kinetic impedance and thereby produced greater enhancement in performances.作者联系地址：浙江工业大学应用化学系纳米科学与技术工程研究中心,浙江工业大学应用化学系纳米科学与技术工程研究中心 浙江杭州310032 ,浙江杭州310032Author's Address: Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou 310014, Chin

Fluorimetric Determination of Acetylspiramycin by Color Reaction of Sulfuric Acid

提出了硫酸颜色反应用于乙酰螺旋霉素的荧光测定新方法.乙酰螺旋霉素本身为弱荧光物质，与浓硫酸反应后生成强荧光物质，所得产物有较强的荧光（λEX＝280nM，λEM＝490nM），其强度与乙酰螺旋霉素的浓度在50μg/l~40Mg/l的范围内线性关系良好.方法的检测限为36μg/l.本法还可直接用于尿液和片剂中乙酰螺旋霉素的定量分析，回收率分别为81.7%~82.6%和92.3%~110.8%.A new fluorimetric method for the determination of acetylspiramycin by the color reaction of sulfuric acid is proposed.Acetylspiramycin is a weak fluorescent substance itself and reacts with sulfuric acid to form a high fluorescent substance( λ ex =280 nm,λ em =490 nm).The fluorescence intensities are proportional to the concentrations of acetylspiramycin over the range of 0.05～20.0 mg/L.The limit of detection is 36 μg/L The recoveries of acetylspiramycin in urine and tablets are 81.7%～82.6% and 92.3%～110.8%, respectively

Synchronized Fluorhatric Determination of Acetylspiramycin by Color Reaction of Sulfuric Acid

提出了硫酸颜色反应用于乙酰螺旋霉素的荧光法测定的新方法。乙酰螺旋霉素本 身为弱荧光物质，与浓硫酸反应后生成强荧光物质。以 △λ＝ 16 nM进行同步扫描，所得的同 步荧光光谱在490nM处的荧光强度与乙酰螺旋霉素的浓度在20μg/l-7Mg/l的范围内线性 关系良好。方法的检测限为 7μg/l。本法可直接用于尿液中乙酰螺旋霉素的定量分析，回收 率为 83.3%~ 88.7%。A new fluorimetric methed for the determination of acetylspiramycin by the color reaction of sulfuric acid is proposed.Acetylspiramycin (AC-SPM) is a weak fluorescent substance itself and it can react with sulfuric acid to form an intensive fluorescent substance(λex.= 474 nm, λem = 490 nm).Using △λ = 16 nm for the synchronized scanning, the fluorescence intensity (λ = 490 nm) was proportional to the concentrations of AC-SPM over the range of 20 μg/L -- 7 mg/L.The detection limit was 7.0 μg/L.The recoveries of AC-SPM in urine and tablets were 83.3% -- 88 .7%.福建省自然科学基

纪念马淳安教授

2016年12月30日凌晨2时55分，浙江工业大学原副校长、绿色化学合成技术国家重点实验室培育基地主任、中国化工学会精细化工专业委员会副主任委员、全国有机电化学与电化学工业联合会理事长马淳安教授在杭州走完了他65年的人生历程。马淳安教授一生致力于电化学和电化学工程领域的教学、科研和成果转化工作，他的逝世，是我国电化学行业的重大损失。他生命不止、学习不止、思考不止和奋斗不止的精神值得我们永远学习!作者联系地址：中国有机电化学与电化学工业联合

转炉脱磷脱硫与相关参数的灰色关联分析

应用灰色系统理论对酒钢50t转炉脱磷、脱硫效果进行灰色关联分析,客观地揭示了脱磷、脱硫效果与生产工艺参数的关系。研究结果简便实用,同时也为实际生产及实现脱磷、脱硫同时优化提供了新的思路和理论依据

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies