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Porous γ-Fe_(2)O_(3) nanoparticle decorated with atomically dispersed platinum: Study on atomic site structural change and gas sensor activity evolution

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Nano Research 2021年第5期14卷 1435-1442页

作者： Qiheng Li Zhi Li Qinghua Zhang lirong Zheng Wensheng Yan Xiao liang Lin Gu Chen Chen Dingsheng Wang Qing Peng Yadong Li Department of Chemistry Tsinghua UniversityBeijing100084China School of Physical Sciences University of Chinese Academy of SciencesBeijing100190China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China National Synchrotron Radiation Laboratory(NSRL) University of Science and Technology of ChinaHefei230029China

Decorating semi-conducting metal oxide with noble metal has been recognized as a viable approach to improve the sensitivity of gas sensor. However, conventional method which relys on noble metal nanoparticles is confronted with drawback of significantly increased cost. To maximize the atom efficiency and reduce the cost for practical industrial application, designing sensor material with noble metal isolated single atom sites (ISAS) doping is a desired option. Here, we report an atomically dispersed platinum on one-dimensional arranged porous γ-Fe2O3 nanoparticle composites as highly efficient ethanol gas sensor. The optimized sample (Pt1-Fe2O3-ox) exhibited a high response (Ra/Rg = 102.4) and good selectivity to ethanol gas. It is demonstrated only the Pt single atom sites with high valance can effectively promote the adsorption capacity to ethanol and consequently enhance the sensitivity of sensing process by changing the electrical structure of Fe2O3 support. This work indicates the single atom sites could play a vital role in improving the performance of conventional metal oxides gas sensors and pave way for the exploration of ISAS-enhanced gas sensor for other volatile organic compounds (VOCs).

关键词： isolated single atom sites structure-activity relationship gas sensor nanocomposites

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2013—2019年太原市食源性疾病主动监测的病原学特征分析

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中国药物与临床 2021年第10期21卷 1654-1657页

作者：梁丽绒李轶平赵利峰张晓华郭晓芳王骥涛太原市疾病预防控制中心微生物检验科 030001

目的了解太原市食源性疾病的病原体分布情况及其流行趋势,提高食源性疾病发生的早期识别能力,为食源性疾病防控起到预警作用。方法对太原市食源性疾病哨点医院所送检的符合病例定义的就诊患者的病例标本进行沙门菌、志贺菌、副溶血性弧... 详细信息

目的了解太原市食源性疾病的病原体分布情况及其流行趋势,提高食源性疾病发生的早期识别能力,为食源性疾病防控起到预警作用。方法对太原市食源性疾病哨点医院所送检的符合病例定义的就诊患者的病例标本进行沙门菌、志贺菌、副溶血性弧菌、致泻性大肠埃希菌4种致病菌和诺如病毒检测。结果2254份肛拭子标本中检出致病菌阳性154份,检出率为6.83%;其中致泻性大肠埃希菌86株,沙门菌47株,志贺菌17株,副溶血性弧菌4株;对1627份粪便标本进行诺如病毒核酸检测,共236份阳性,检出率14.51%。在年龄分布上,12~29岁年龄段的青年为致病菌高发人群,<5岁的年龄段的儿童为诺如病毒高发人群;在时间分布上,夏季(6~9月份)为致病菌发病高峰,春秋冬季(2月和10、12月)为诺如病毒发病高峰;致病菌总检出率基本上呈现逐年下降的趋势,而诺如病毒每年检出率都保持居高不下。血清和基因分型上,沙门菌以肠炎沙门菌和鼠伤寒沙门菌为主,志贺菌基本为宋内志贺菌和福氏志贺菌2a,致泻大肠埃希菌以肠黏附性大肠埃希菌(EAEC)最多,副溶血弧菌毒力基因均为tdh,诺如病毒分型以GⅡ型为主。结论太原市食源性疾病病原体以诺如病毒和致泻大肠埃希菌为主,尤其诺如病毒检出率居高不下,需加强监测以降低其引起食源性疾病的发生。

关键词：人群监测食源性疾病病原学

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不同施肥处理对郁闭杨树林地麦冬生长的影响

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湖南林业科技 2016年第5期43卷 88-91页

作者：康伟静张国君宋国宝肖兴翠梁丽容龚细娟罗泳加泰格林纸集团湖南茂源林业有限责任公司湖南岳阳414002

在郁闭杨树林地间作麦冬,研究不同施肥处理对麦冬生长的影响。结果表明:施肥对2年生麦冬的地上部分鲜重及分蘖株数的影响不大,但对麦冬块根生长有极显著促进作用。3种施肥处理对比不施肥的对照,块根鲜重分别增加了179%、196%、342%,块... 详细信息

在郁闭杨树林地间作麦冬,研究不同施肥处理对麦冬生长的影响。结果表明:施肥对2年生麦冬的地上部分鲜重及分蘖株数的影响不大,但对麦冬块根生长有极显著促进作用。3种施肥处理对比不施肥的对照,块根鲜重分别增加了179%、196%、342%,块根干重分别增加了170%、177%、294%。在复合肥用量不变的情况下,增加鸡粪用量到15 000 kg/hm^2,麦冬块根鲜、干重分别为2 861 kg/hm^2、1 408 kg/hm^2,相比鸡粪用量3 750 kg/hm^2处理,块根鲜、干重分别增加了58.8%、46.1%;相比鸡粪用量7 500 kg/hm^2处理,块根鲜、干重分别增加了49.2%、42.5%。施肥还有助于提高麦冬块根的外观品质。

关键词：麦冬施肥生长块根分蘖

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Effects of complement inhibition on the ABC phenomenon in rats

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Asian Journal of Pharmaceutical Sciences 2017年第3期12卷 250-258页

作者： lirong Wang Yuqing Su Xuling Wang Kaifan liang Mengyang Liu Wenya Tang Yanzhi Song Xinrong Liu Yihui Deng Shenyang Pharmaceutical University

Researchers reported that intravenously injected PEGylated colloidal drug carriers lose their long-circulating characteristic and accumulated extensively in liver when they are administrated twice in the same animal with certain intervals. This phenomenon was referred to as the 'accelerated blood clearance(ABC) phenomenon'. Some former studies had found that complement-mediated phagocytosis, activated by antigen–antibody complex, was responsible for inducing the phenomenon. According to the theory, we have used cobra venom factor to deplete complement in vivo and to investigate the effect of complement inhibition on the ABC phenomenon. Rats were administered by injection of cobra venom factor solution to build up the model of complement exhaustion/inhibition, and the effect of the inhibition of complement on ABC phenomenon was carried out. It seemed that inhibition of complement didn’t affect the pharmacokinetic of the first infection. By contrast, in rats of which complement had been depleted, the second dose of PEGylated nanoemulsions showed enhanced circulation time compared with normal rats in a complement inhibition-independent manner, but the ABC phenomenon was not completely eliminated. It indicated that complement inhibition could certainly weaken the accelerated clearance;meanwhile, there were other factors causing the ABC *** findings provide novel insights into the attenuating of ABC phenomenon and lay foundation for further study of immune mechanism.

关键词： ABC phenomenon PEGylated nanoemulsions Complement inhibition Cobra venom factor

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地方高校转型契机下的制药工程专业应用型人才培养的探索

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科技创新导报 2015年第1期12卷 156-157页

作者：赖红芳蒋利荣韦正河池学院化学与生物工程学院广西宜州546300

"应用型"大学首先是对经济社会发展对人才需求的一种积极回应,是一种以满足经济社会发展需求,以应用型人才为主要培养目标,其培养的学生,动手能力强于研究型,理论基础和专业能力又强于高职院校,这就构成了"应用型"大学的内涵和要求。通... 详细信息

"应用型"大学首先是对经济社会发展对人才需求的一种积极回应,是一种以满足经济社会发展需求,以应用型人才为主要培养目标,其培养的学生,动手能力强于研究型,理论基础和专业能力又强于高职院校,这就构成了"应用型"大学的内涵和要求。通过探讨转型背景下地方高校制药工程专业人才培养方案,从专业方向的转型,培养模式和教学内容的转型,教师队伍的转型和实践教学的更新和发展几个方面来构建地方高校制药工程专业应用型人才培养模式,以期培养出适应社会需求的高层次人才。

关键词：地方高校转型制药工程人才培养

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NCM颗粒截面样品制备

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分析仪器 2019年第3期 90-93页

作者：任博颖梁丽荣鞠晶北京大学化学与分子工程学院北京100871 天津理工大学天津300222 北京悦昌行科技有限公司北京100085

NCM粉末是被广泛用于锂离子电池工业的正极材料,主要由Ni、Co和Mn等活泼金属组成,性质活泼,在空气中不稳定。NCM正极材料的微观结构是影响电池性能的重要因素。扫描电子显微镜(SEM)分析是研究电池材料微观结构的重要手段,二次电子信号... 详细信息

NCM粉末是被广泛用于锂离子电池工业的正极材料,主要由Ni、Co和Mn等活泼金属组成,性质活泼,在空气中不稳定。NCM正极材料的微观结构是影响电池性能的重要因素。扫描电子显微镜(SEM)分析是研究电池材料微观结构的重要手段,二次电子信号、背散射电子信号以及能谱分析等能给出电池材料的微观结构,成分等重要信息。由于NCM粉末化学性质活泼,表面和内部结构存在差异,需要采用合适的制样方法来获得尽量平整的颗粒截面用于高质量SEM分析。同时,选择处理方法时应该充分考虑样品性质及观察需求,避免由于处理方式不当产生不真实的样品观察平面。本实验开发了以碳导电胶液(碳胶)作为填充剂、粘合剂、分散剂,用离子束加工技术替代传统机械切割抛光方法制备NCM颗粒截面样品。结果表明,该方法获得的NCM颗粒截面,样品保持稳定,截面平整度好,可观测区域大,满足了在SEM下观察和表征电池正极材料的研究需要。

关键词： NCM颗粒离子束轰击技术扫描电子显微镜

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Fabricating Pd isolated single atom sites on C3N4/rGO for heterogenization of homogeneous catalysis

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Nano Research 2020年第4期13卷 947-951页

作者： Ninghua Fu Xiao liang Zhi Li Wenxing Chen Yu Wang lirong Zheng Qinghua Zhang Chen Chen Dingsheng Wang Qing Peng Lin Gu Yadong Li Department of Chemistry Tsinghua UniversityBeijing 100084China Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science andEngineeringBeijing Institute of TechnologyBeijing 100081China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Metal isolated single atomic sites catalysts have attracted intensive attention in recent years owing to their maximized atom utilization and unique *** the success of single atom catalyst synthesis,directly anchoring metal single atoms on three-dimensional(3D)macro support,which is promising to achieve the heterogenization of homogeneous catalysis,remains a challenge and a blank in this ***,we successfully fabricate metal single atoms(Pd,Pt,Ru,Au)on porous carbon nitride/reduced graphene oxide(C3N4/rGO)foam as highly efficient catalysts with convenient recyclability.C3N4/rGO foam features two-dimensional microstructures with abundant N chelating sites for the stabilization of metal single atoms and vertically-aligned hierarchical mesostructure that benefits the mass *** obtained Pdi/C3N4/rGO monolith catalyst exhibits much enhanced activity over its nanoparticle counterpart for Suzuki-Miyaura ***,the Pdi/C3N4/rGO monolith catalyst can be readily assembled in a flow reactor to achieve the highly efficient continuous production of 4-nitro-1,1'-biphenyl through Suzuki-Miyaura coupling.

关键词： heterogenization of hom ogeneous catalysis metal isolated single atoms carbon nitride reduced graphene oxide monolith catalyst

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Copper single-atom catalysts with photothermal performance and enhanced nanozyme activity for bacteria-infected wound therapy

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Bioactive Materials 2021年第12期6卷 4389-4401页

作者： Xianwen Wang Qianqian Shi Zhengbao Zha Dongdong Zhu lirong Zheng Luoxiang Shi Xianwen Wei Lian Lian Konglin Wu liang Cheng Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-based Functional Materials and DevicesSoochow UniversitySuzhou215123PR China School of Food and Biological Engineering Hefei University of TechnologyHefei230009PR China Institute of Clean Energy and Advanced Nanocatalysis School of Chemistry and Chemical EngineeringAnhui University of TechnologyMaanshan243002PR China Beijing Synchrotron Radiation Facility(NSRF) Institute of High Energy PhysicsChinese Academy of ScienceBeijing100049China Department of Oncology Suzhou Xiangcheng People’s HospitalSuzhou215131China

Nanozymes have become a new generation of antibiotics with exciting broad-spectrum antibacterial properties and negligible biological ***,their inherent low catalytic activity limits their antibacterial ***,Cu single-atom sites/N doped porous carbon(Cu SASs/NPC)is successfully constructed for photothermal-catalytic antibacterial treatment by a pyrolysis-etching-adsorption-pyrolysis(PEAP)*** SASs/NPC have stronger peroxidase-like catalytic activity,glutathione(GSH)-depleting function,and photothermal property compared with non-Cu-doped NPC,indicating that Cu doping significantly improves the catalytic performance of *** SASs/NPC can effectively induce peroxidase-like activity in the presence of H2O2,thereby generating a large amount of hydroxyl radicals(•OH),which have a certain killing effect on bacteria and make bacteria more susceptible to *** introduction of near-infrared(NIR)light can generate hyperthermia to fight bacteria,and enhance the peroxidase-like catalytic activity,thereby generating additional•OH to destroy ***,Cu SASs/NPC can act as GSH peroxidase(GSH-Px)-like nanozymes,which can deplete GSH in bacteria,thereby significantly improving the sterilization ***-catalytic synergistic antibacterial strategy produces almost 100%antibacterial efficiency against Escherichia coli(***)and methicillin-resistant Staphylococcus aureus(MRSA).In vivo experiments show a better PTT-catalytic synergistic therapeutic performance on MRSA-infected mouse ***,our work highlights the wide antibacterial and anti-infective bio-applications of Cu single-atom-containing catalysts.

关键词： Copper single-atom catalysts Nanozymes Photothermal therapy Antibacterial Catalytic therapy

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First Human Infection with Avian Influenza H9N2—Guangdong Province,China,2020

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China CDC weekly 2020年第29期2卷 545-548页

作者： Qianfang Guo lirong Zou Jianxiang Yu Yingchao Song Lijun liang Xue Zhuang Tie Song Jie Wu Guangdong Provincial Center of Disease Control and Prevention GuangzhouGuangdongChina Southern Medical University School of Public HealthGuangzhouGuangdongChina

A case of avian influenza H9N2 was detected in a human in Zhuhai City,Guangdong Province through routine influenza surveillance on March 30,*** patient was a 3-year-old child who developed fever and cough on March 22.A pharyngeal swab was collected on March 23,and the novel coronavirus nucleic acid test was *** March 26,the pharyngeal swab was sent to Zhuhai CDC for influenza virus tests and was found to be H9 influenza A positive,and on March 30,Guangdong Provincial CDC reexamined the pharyngeal swabs as positive for influenza A(H9N2).

关键词： Guangdong routine Province,China

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考虑风电预测误差时序性及风电可信度的双层优化模型

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电工技术学报 2023年第6期38卷 1620-1632,1661页

作者：徐询谢丽蓉梁武星叶家豪马兰可再生能源发电与并网技术教育部工程研究中心(新疆大学) 乌鲁木齐830047

推动风电等清洁能源是实现双碳目标的有力举措。为此针对风电的不确定性,提出考虑风电预测误差时序性及风电可信度的双层优化模型。首先,根据风电预测误差的时序相关性优化预测误差分段数;然后,建立双层优化模型,日前阶段上层模型基于... 详细信息

推动风电等清洁能源是实现双碳目标的有力举措。为此针对风电的不确定性,提出考虑风电预测误差时序性及风电可信度的双层优化模型。首先,根据风电预测误差的时序相关性优化预测误差分段数;然后,建立双层优化模型,日前阶段上层模型基于风电功率上下波动域以最大化利用风电和最小化发电成本及碳交易成本为目标函数,日内阶段基于风电概率性场景以最小化系统偏差校正成本及风险成本为目标函数,并考虑激励型需求响应,通过风电可信度耦合关联上下层模型;最后,以新疆某地区风电场数据进行仿真分析,结果表明所提模型能够降低系统风险成本,协调风电和火电的输出功率,并提高风电接入系统的整体经济性。

关键词：风电预测误差概率密度分布自动发电控制双层优化模型

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