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Comparative study on the hydrogen storage performance of as-milled MgRENi rapid quenched alloy catalyzed by metal sulfides

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Journal of Magnesium and Alloys 2024年第5期12卷 2010-2023页

作者： xiaoping dong Zhaoqing Zhang Liying Yang Shenghai Xin Dandan Su Zhiyuan Li Department of Mechanical Design and Manufacture and Automation Hebei UniversityBaoding 071000PR China Baoding New Energy Vehicle Power Engineering Technology Research Center Hebei UniversityBaoding 071002PR China Hebei Technology Innovation Center for Lightweight of New Energy Vehicle Power System(Preparation) Hebei UniversityBaoding 071002PR China

The composites of Mg_(20)Pr_(1)Sm_(3)Y_(1)Ni_(10)as-quenched alloy and 3 wt.%M(M=CoS,CoS_(2),MoS_(2))catalyst were prepared by high-speed vibration ball *** effects of metal sulfides on the hydrogenation and dehydrogenation dynamics of alloys were *** results show that the as-milled composites contain a large number of amorphous embedded by a small amount of nanocrystals,and there are many point *** ball milling,the crystal grain size in the composites containing CoS is relatively larger,followed by CoS_(2)and MoS_(2)*** hydrogenation,the amorphous phase is crystallized to form Mg_(2)NiH_(4),YH_(3),Pr_(8)H_(18.96),Sm_(3)H_7,Mg,Co or Mo phases,however,Mg_(2)Ni,YH_(2),PrH_(2)and Ni_(3)Y phases appeared after *** maximum hydrogenation capacity of the composites containing CoS,CoS_(2)and MoS_(2)are 3.939,4.265 and 4.507 wt.%,*** hydrogenation saturation ratio of composite containing MoS_(2)is higher than that of the composites containing CoS and CoS_(2).The dehydrogenation activation energy of the composites containing CoS,CoS_(2)and MoS_(2)is 107.76,68.43 and 63.28 ***^(-1).H_(2).On the improvement of hydrogen storage performance of Mg_(20)Pr_(1)Sm_(3)Y_(1)Ni_(10)alloy,the catalytic effect of MoS_(2)sulfide is better than that of CoS_(2)sulfide,and which is better than CoS sulfide.

关键词： Mg_(20)Pr_(1)Sm_(3)Y_(1)Ni_(10)as-quenched alloy CoS CoS_(2)and MoS_(2)sulfide Milling Activation energy Hydrogen storage dynamics

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Magnesium doping to improve the light to heat conversion of OMS-2 for formaldehyde oxidation under visible light irradiation

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Chinese Chemical Letters 2024年第4期35卷 193-198页

作者： Tingting Liu Pengfei Sun Wei Zhao Yingshuang Li Lujun Cheng Jiahai Fan Xiaohui Bi xiaoping dong College of Chemistry and Chemical Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China College of Environmental Science and Engineering Nankai UniversityTianjin 300071China Hangzhou Kaiming Catalyst Co. Ltd.Hangzhou 310013China

Mg-doped manganese oxide octahedral molecular sieve(Mg-OMS-2)catalysts were prepared by hydrothermal *** photothermal degradation performance of these catalysts for formaldehyde(HCHO)in batch system and continuous system was *** light absorption of OMS-2 was increased by Mg-doped,especially for near infrared light,which promoted surface temperature reach a maximum of 214.8℃ under xenon *** this temperature,the reinforced surface lattice oxygen and oxygen vacancy that formed by lattice distortion via Mg-doped were *** best HCHO elimination efficiency was achieved over Mg_(0.2)/OMS-2 catalyst with Mg^(2+)/Mn^(2+)=1/5,which could reduce HCHO from 250 ppm to 10 ppm within 20 *** in situ DRIFTS was also carried out to monitor the changes in the content of reaction intermediates and analyze the degradation paths of *** was found the HCHO was attacked by formed·OH and·O^(2-) to generate formate species and carbonate species,and finally transformed to CO_(2) and H_(2)*** photothermal catalytic oxidation process exhibited a high efficiency purification of HCHO without the help of extra energy consumption.

关键词： Mg doping Photothermal catalysis OMS-2 HCHO Reaction mechanism

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Genomic Surveillance for SARS-CoV-2 Variants: Dominance of XBB Replacement — China, January–June 2023

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China CDC weekly 2024年第15期6卷 324-331页

作者： Yenan Feng Qiudong Su Lili Li Xiaozhou He Peihua Niu Xiaojuan Guo Xiang Zhao Jing Tang Zhiyuan Jia Ji Wang Changcheng Wu Baicheng Xia Zhixiao Chen Yuchao Wu Jing Yang Songqi Chen Cao Chen Shiwen Wang xiaoping dong National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijingChina NHC Key Laboratory of Medical Virology and Viral Diseases National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijingChina

Introduction:In the first half of 2023,a global shift was observed towards the predominance of XBB *** faced a significant epidemic between late 2022 and early 2023 due to Omicron subvariants BA.5.2 and *** study aims to depict the evolving variant distribution among provincial-level administrative divisions(PLADs)in China and explore the factors driving the predominance of XBB ***:Sequences from local and imported coronavirus disease 2019(COVID-19)cases recorded between January 1 and June 30,2023,were *** study analyzed the changing distribution of viral variants and assessed how the prior dominance of specific variants,XBB subvariants,and imported cases influenced the prevalence of the XBB replacement ***:A total of 56,486 sequences were obtained from local cases,and 8,669 sequences were from imported *** in April,there was a shift in the prevalence of XBB from imported to local cases,with varying dominance among *** PLADs previously high in BF.7,the rise of XBB was delayed.A positive correlation was found between XBB proportions in imported cases from January to March and local cases in *** distribution pattern of XBB subvariants differed between local and imported cases within the same *** significant differences were noted in the replacement rates of XBB ***:The timing of XBB dominance differed among various PLADs in China in the first half of 2023,correlating closely with the prevalence of XBB variants among imported cases.

关键词： dominance imported distribution

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师范生教育教学能力评价:逻辑理路、实践困境和创新路径

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重庆开放大学学报 2024年第3期36卷 54-61页

作者：谭雲董小平重庆师范大学教育科学学院重庆401331 重庆市教育评估院高等教育评估所重庆400020

师范生教育教学能力评价是对师范生表现出的教育教学素质有机体进行价值判断和引领的活动,是科学衡量和引领师范生教育教学能力发展质量的指挥棒。科学实施师范生教育教学能力评价存在共时逻辑、历时逻辑和产出逻辑理路。要破解我国师... 详细信息

师范生教育教学能力评价是对师范生表现出的教育教学素质有机体进行价值判断和引领的活动,是科学衡量和引领师范生教育教学能力发展质量的指挥棒。科学实施师范生教育教学能力评价存在共时逻辑、历时逻辑和产出逻辑理路。要破解我国师范生教育教学能力评价中存在的横向割裂、纵向脱节、产出导向不畅等现实问题,就需要遵循评价逻辑理路,通过创新共生评价机制构建同阶段教育教学能力评价的有序结构,通过创新发展评价机制构建不同阶段教育教学能力评价的贯通路径,通过创新立体评价机制构建保障教育教学能力评价的三维运行体系。

关键词：师范生教育教学能力评价逻辑理路实践困境创新路径

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Revealing the Mysterious Veil of Prion Diseases Under the Framework of China CDC

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China CDC weekly 2022年第33期4卷 721-722页

作者： xiaoping dong State Key Laboratory for Infectious Disease Prevention and Control NHC Key Laboratory of Medical Virology and Viral DiseasesNational Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijingChina Center for Biosafety Mega-Science Chinese Academy of SciencesWuhan CityHubei ProvinceChina China Academy of Chinese Medical Sciences BeijingChina Shanghai Institute of Infectious Disease and Biosafety Shanghai MunicipalityChina

Prion disease(PrD)or transmissible spongiform encephalopathy(TSE)is a group of transmissible and fatal neurodegenerative diseases affecting humans and many animal ***,PrD,either in humans or in animals,has been documented for more than hundreds of years,e.g.,scrapie in the early 18th century and human Creutzfeldt-Jakob disease(CJD)in the early 20th century(1–2).However,the hypothesis and conception of“prions”have been gradually accepted only since the *** an unconventional infectious agent without nucleic acids,the principle of the“prion”is unsolved conformational changes from host normal membrane protein PrPc to abnormal pathogenic scrapie-like prion protein(PrP^(Sc))((3).The hypothesis of the prion concept mostly explains the pathogenesis of PrD;however,there are still many gaps that need to be *** importantly,“prion theory”opens a completely new window in biology,possibly highlighting a new type of life.

关键词： species hypothesis hundreds

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Microcalorimetric investigation of the effect of berberine alkaloids from Coptis chinensis Franch on Staphylococcus aureus growth

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Science China Chemistry 2008年第7期51卷 640-645页

作者： YAN Dan XIAO XiaoHe JIN Cheng dong xiaoping Institute of Chinese Medicine 302 Hospital of People’s Liberation ArmyBeijing 100039China Chengdu University of Traditional Chinese Medicine Chengdu 610075China

The inhibitory effects of three berberine alkaloids (BAs) from rhizome of Coptis chinensis Franch, a traditional Chinese medicinal (TCM) herb, on Staphylococcus aureus growth were investigated by mi- crocalorimetry. The power–time curves of S. aureus with and without BAs were acquired; meanwhile the extent and duration of inhibitory effects on the metabolism were evaluated by studying the growth rate constant (k), half inhibitory ratio (IC50), maximum heat-output power (Pmax), peak time of maximum heat-output power (tp) and total heat production (Qt). The value of k of S. aureus in the presence of the three BAs decreased with the increasing concentrations of BAs. Moreover, Pmax was reduced and the value of tp increased with increasing concentrations of the three drugs. The inhibitory activity varied with different drugs. The values of IC50 of the three BAs are respectively, 101.4 μg/mL for berberine, 241.0 μg/mL for palmatine and 792.3 μg/mL for jateorrhizine. The sequence of antimicrobial activity of the three BAs is: berberine > palmatine > jateorrhizine. It is suggested that the functional group me- thylenedioxy or methoxyl at C2 on the phenyl ring could possibly improve antimicrobial activity more strongly than hydroxyl at C2 on the phenyl ring.

关键词： berberine alkaloid microcalorimetry Staphylococcus aureus inhibitory effect

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朊病毒感染的仓鼠脑组织中NLRP3介导的炎症反应机制的初步探索

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病毒学报 2024年第1期40卷 38-44页

作者：周冬花武月章王远梁冬林肖康董小平石琦中国疾病预防控制中心病毒病预防控制所传染病预防控制国家重点实验室北京102206

神经炎症主要由活化的胶质细胞介导,是大多数神经退行性疾病的共同特征。为了探究朊病毒感染后的大脑神经炎症反应与核苷酸结合寡聚化结构域样受体蛋白3(NOD-like receptor protein 3, NLRP3)炎症小体形成是否相关,本研究以朊病毒感染... 详细信息

神经炎症主要由活化的胶质细胞介导,是大多数神经退行性疾病的共同特征。为了探究朊病毒感染后的大脑神经炎症反应与核苷酸结合寡聚化结构域样受体蛋白3(NOD-like receptor protein 3, NLRP3)炎症小体形成是否相关,本研究以朊病毒感染的仓鼠脑组织为研究对象,通过Western blot、免疫组织荧光方法检测了脑组织中NLRP3的生成和分布;同时借助免疫共沉淀方法检测了NLRP3炎症小体的形成情况。结果显示:朊病毒感染后,仓鼠脑组织中大脑皮层和海马区NLRP3的合成均明显增加,海马区的含量明显高于大脑皮层;NLRP3与星形胶质细胞存在明显共定位的现象,与小胶质细胞及神经元细胞几乎不存在共定位;感染后的仓鼠脑组织中炎症小体的另外两种组成成分半胱氨酸蛋白酶前体(Procaspase1,proCas1)和凋亡相关颗粒样蛋白(Apoptosis-associated granuloid proteins, ASC)也明显高于正常仓鼠。这些结果表明:朊病毒感染后,仓鼠脑组织中NLRP3及炎症小体合成明显增多,NLRP3炎症小体的组装主要发生在星形胶质细胞中。

关键词：朊病毒 NLRP3炎症小体星形胶质细胞神经炎症脑组织

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Rheological behavior of PMVE-MA aqueous solution with metallic cations

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Frontiers of Chemical Science and Engineering 2011年第1期5卷 126-130页

作者： xiaoping dong Li LI Jun XU Xuhong GUO State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China

The rheological properties of aqueous solutions of poly(methyl vinyl ether-co-maleic anhydride)(PMVE-MA)upon addition of metallic cations at different pH values were ***-gel transition and shearthickening phenomena at moderate shear rate were observed upon increasing the amount of metallic cations,especially for cupric *** certain molar ratio(fgel)of added cupric cations to carboxyl groups in PMVE-MA,the system became gel-like,and the storage modulus(G′)and loss modulus(G′′)were parallel and exhibited a power-law dependence on the frequency,which is consistent with Winter’s hypothesis of determining the gel point of a crosslinking *** shear-thickening behavior depends on fgel,pH,metallic valence,and temperature.

关键词： poly(methyl vinyl ether-co-maleic anhydride) shear-thickening gel point rheology

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Effects of rapid quenching on structure and cycle stability of La-Mg-Ni-Co type hydrogen storage alloy

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Rare Metals 2006年第Z1期25卷 207-212页

作者： dong xiaoping Lü Fanxiu ZHANG Yanghuan YANG Liying FENG Meng WANG Xinlin School of Material Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China School of Material Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China School of Mateials Inner Mongolia University of Science and Technology Baotou 01401 China School of Material Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China

In order to improve the cycle stability of La-Mg-Ni-Co type alloy electrode, rapid quenching technology was employed. The effects of rapid quenching on the microstructure and cycle stability of the alloy were investigated. The obtained results show that the La2Mg(Ni0.85Co0.15)9M0.1 (M=B, Cr) alloy electrodes are composed of (La, Mg)Ni3 phase, LaNi5 phase and a small amount of the LaNi2 phase. A trace of the Ni2B phase exists in the as-cast MB alloy, and the Ni2B phase in the alloy nearly disappears after rapid quenching. Rapid quenching technology can slightly improve the cycling life of the alloy. When the quenching rate increases from 0 m·s-1 (As-cast is defined as quenching rate of 0 m·s-1) to 30 m·s-1, the cycle lives of the MB, MCr alloys enhance from 86 and 87 cycles to 106 and 119 cycles, respectively. On the other hand, the average capacity decay rates of the MB, MCr alloys decrease from 1.7172 and 1.7178 mAh·g-1·cycle-1 to 1.5751 and 1.3060 mAh·g-1·cycle-1 after 86 charge-discharges cycling, respectively.

关键词： rapid quenching La-Mg-Ni-Co type hydrogen storage alloy structure characteristics cycle stability

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Effects of substituting Ni with M (M=Cu, Al and Mn) on microstructures and electrochemical characteristics of La-Mg-Ni system (PuNi_3-type) electrode alloys

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Rare Metals 2006年第Z1期25卷 25-32页

作者： ZHANG Yanghuan ZHAO dongliang dong xiaoping REN Huiping GUO Shihai WANG Xinlin Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China School of Material Inner Mongolia University of Science and Technology Baotou 014010 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China School of Material University of Science and Technology Beijing Beijing 100083 China School of Material Inner Mongolia University of Science and Technology Baotou 014010 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China

In order to improve the electrochemical cycle stability of La-Mg-Ni system (PuNi3-type) hydrogen storage alloy, Ni in the alloys was partially substituted by M (M=Cu, Al, Mn). A new La-Mg-Ni system electrode alloys La0.7Mg0.3Ni2.55-xCo0.45Mx (M=Cu, Al, Mn; x=0, 0.1) were prepared by casting and rapid quenching. The effects of element substitution and rapid quenching on the microstructures and electrochemical performances of the alloys were investigated. The results by XRD, SEM and TEM show that the alloys have a multiphase structure, including the (La, Mg)Ni3 phase, the LaNi5 phase and the LaNi2 phase. The rapid quenching and element substitution have an imperceptible influence on the phase compositions of the alloys, but both change the phase abundance of the alloys. The rapid quenching significantly improves the composition homogeneity of the alloys and markedly decreases the grain size of the alloys. The Cu substitution promotes the formation of an amorphous phase in the as-quenched alloy, and a reversal result by the Al substitution. The electrochemical measurement indicates that the element substitution decreases the discharge capacity of the alloys, whereas it obviously improves the cycle stability of the alloys. The positive influence of element substitution on the cycle life of the alloys is in sequence Al>Cu>Mn, and negative influence on the discharge capacity is in sequence Al>Mn>Cu. The rapid quenching significantly enhances the cycle stability of the alloys, but it leads to a different extent decrease of the discharge capacity of the alloys.

关键词： element substitution rapid quenching La-Mg-Ni system electrode alloy microstructures electrochemical performances

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