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Silver nanoparticles on UiO-66(Zr)metal-organic frameworks for water disinfection application

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Food Science and Human Wellness 2022年第2期11卷 269-276页

作者： Hui Chen Chen Qiu yiran jiang Xinyu Liao Dan Wu Mofei Shen Tian Ding College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058China

Drinking water disinfection is an essential process to assure public health all over the *** this study,silver nanoparticles(AgNPs)on UiO-66(Zr)Metal-Organic Frameworks(Ag@UiO-66)is proposed as a potential water disinfection *** are synthesized using polyvinyl pyrrolidone(PVP)as stabilizing agent,and sodium borohydride as reducing agent are subsequently embedded on UiO-66,a high-stability organometallic *** effect of premixing time,reaction time and reactant concentration on the loading rate of AgNPs on UiO-66 was *** maximum load rate of AgNPs on UiO-66 could reach 13%when the premixing time is 3 h,the reaction time is 45 min and the concentration of AgNO_(3) is10μg/*** formation of AgNPs loaded on UiO-66 was observed and confirmed with ultraviolet and visible spectrophotometry(UV-Vis),scanning electron microscopy(SEM),infrared emission spectroscopy(IES)and X-ray diffraction(XRD)***@UiO-66 exhibited strong antibacterial activity against both Gramnegative Escherichia coli and Gram-positive Staphylococcus aureus,with minimum inhibitory concentrations(MIC)of 64 and 128μg/mL,*** germicidal efficacy of Ag@UiO-66 enhanced significantly as the temperature rose from 4℃to 37℃.The results indicate that Ag@UiO-66 is potential candidate as a feasible water disinfection material.

关键词： Metal-organic framework Silver nanoparticles Antibacterial effects Water disinfection

The Major Cause of the Collapse of the Versailles System

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Macro Management & Public Policies 2020年第3期2卷 8-10页

作者： yiran jiang Beijing Academy Beijing100000China

The establishment of the Versailles System was marked with the Paris Peace Conference,which aimed to settle peace for World War *** peace settlement was an excuse for the allied countries to regain and recover their ***,in turn,called for large amount of reparations and punishments on the losing *** signing of the Treaty of Versailles heralded the collapse of the volatile system set up *** adopted the policies of appeasement,complied to the race of powers,and abandoned the so-called consensus on“peace”.Indeed,the collapse of the Versailles System had many ***,the rise of Nazi was its direct *** article will mainly focus on how the Versailles System led to the rise of the Nazi and what the Nazi did to accelerate the fall of the system.

关键词： Treaty of Versailles The Versailles system Germany The rise of the Nazi

Research on OPC-based Fracturing Unit Control System

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Journal of Electronic Research and Application 2020年第1期4卷 31-34页

作者： yiran jiang Hui Wu Baoding University of Technology Baoding 071000China Research Institute of Sany Heavy Energy Equipment Co. Ltd.Beijing 102202China

With the large-scale integration of fracturing unit’s on-site construction,traditional industrial buses are increasingly unable to meet the requirements for the quantity transmission between various equipment in large-scale fracturing units,and different models of different equipment manufacturers cannot cooperate with each other as there are“Islands of information”in the control *** article uses industrial Ethernet as the physical medium for data *** addition,different equipment manufacturers use OPC as the core technology of the fracturing unit control system network,and set up an intelligent fracturing unit control system,so that the control network can quickly,accurately,and safely control the fracturing truck control *** sand truck control system monitors and analyzes,saves,and prints the construction data in the vehicle *** the same time,the network control system uses the vehicle instrument as the core of the *** can control fracturing vehicles from different *** sand mixer truck performs network control,which effectively avoids incompatibilities between various equipment manufacturers at the construction site.

关键词： OPC Ethernet Control system Fracturing unit

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大量高铁地震事件的属性体提取与特性分析

地球物理学报 2019年第6期62卷 2313-2320页

作者：刘磊蒋一然中国科学院电子学研究所北京100190 中国科学院空间信息处理与应用系统技术重点实验室北京100190 北京大学地球与空间科学学院北京100871 高铁地震学联合研究组北京100029

列车在高铁上运行能够产生大量的高铁地震事件,这些地震事件既包含了作为震源的列车本身的结构信息,也蕴含了高铁线路的地质环境信息.本文提出了一种频率-空间-时间(FXT)属性描述大量高铁地震事件之间的关联.在FXT属性上,高铁地震信号... 详细信息

列车在高铁上运行能够产生大量的高铁地震事件,这些地震事件既包含了作为震源的列车本身的结构信息,也蕴含了高铁线路的地质环境信息.本文提出了一种频率-空间-时间(FXT)属性描述大量高铁地震事件之间的关联.在FXT属性上,高铁地震信号之间的关联表征为在频率坐标轴F上相互对齐、在空间位置坐标轴X和事件到达时间坐标轴T上连续变化的分立谱线.本文对课题组在深圳为期两天的观测采集得到的4500余条高铁地震信号进行了FXT属性的提取,并对FXT属性进行了统计特性的分析:方差分析表明,高铁线路的地质环境的变化对高铁地震信号特征的影响大于不同列车的结构差异对高铁地震信号特征的影响;聚类分析表明,高铁地震信号的特征按接收点位置能够无监督地聚类为和高铁线路途经地质环境相关联的不同类别.通过上述分析表明,高铁地震信号中蕴含着丰富的可解释的高铁运行地质环境信息,具备对高铁列车运行安全进行监测的潜力.

关键词：高铁地震事件属性特性分析方差分析聚类分析

基于支持向量机的地震体波震相自动识别及到时自动拾取

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地球物理学报 2019年第1期62卷 361-373页

作者：蒋一然宁杰远页岩油气富集机理与有效开发国家重点实验室北京100083 北京大学地球与空间科学学院北京100871

面对海量地震资料,自动准确地拾取震相并确定其到时的需求非常迫切.基于支持向量机技术,本文提出了使用两个分类器SSD和SPS自动识别地震体波震相并自动拾取其到时的方法.相比于传统的自动拾取方法,本文方法能够更准确地识别震相并区分P... 详细信息

面对海量地震资料,自动准确地拾取震相并确定其到时的需求非常迫切.基于支持向量机技术,本文提出了使用两个分类器SSD和SPS自动识别地震体波震相并自动拾取其到时的方法.相比于传统的自动拾取方法,本文方法能够更准确地识别震相并区分P波和S波.进一步地,我们提出了利用台阵资料辅助识别震相的方案,有效地提高了地震震相拾取的准确率.

关键词：地震震相识别人工智能支持向量机地震目录

S355低合金结构钢的动态连续冷却转变曲线及力学性能

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金属热处理 2024年第4期49卷 38-41页

作者：黄东蒋义然中冶南方工程技术有限公司湖北武汉430220 保定理工学院河北保定071000

采用Gleeble-3800热模拟试验机测定了S355低合金结构钢的动态CCT曲线,并通过室温拉伸试验、低温冲击试验、显微组织观察等手段,研究了不同轧制温度与冷却方式对S355结构钢的组织与力学性能的影响。结果表明,当冷却速度<10℃/s时,S355结... 详细信息

采用Gleeble-3800热模拟试验机测定了S355低合金结构钢的动态CCT曲线,并通过室温拉伸试验、低温冲击试验、显微组织观察等手段,研究了不同轧制温度与冷却方式对S355结构钢的组织与力学性能的影响。结果表明,当冷却速度<10℃/s时,S355结构钢相变产物为铁素体、珠光体与贝氏体。冷却速度在10~15℃/s范围时,S355钢相变产物为铁素体、贝氏体。轧制后采用水冷冷却的S355钢的强度和屈强较高,低温冲击性能较低。采用空冷冷却的S355结构钢强度和屈强比较低,低温冲击性能较高。轧制温度840℃,空冷轧制的S355钢综合力学性能可满足BS EN 10225—2009的要求。

关键词： S355钢 CCT曲线轧制工艺组织力学性能

Numerical Investigations on Supercritical Heat Transfer Characteristics of Environmental Friendly Refrigerants

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International Journal of Clean Coal and Energy 2021年第2期10卷 21-40页

作者： Adnan Ibrahim Peng Hu yiran jiang Ali Riaz Farrukh Saleem Yifang Dong Lei Jia Panpan Zhao Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei China Department of Mechanical Engineering Pakistan Institute of Engineering and Applied Sciences Islamabad Pakistan School of Engineering Science University of Science and Technology of China Hefei China Hefei General Machinery Research Institute Co. Ltd. Hefei China

The heat transfer of supercritical fluids is a vastly growing field, specifically to find suitable alternatives to replace conventional R134a, which can be beneficial for climate change. Most of the experimental and numerical investigations have been conducted to explore supercritical water, carbon dioxide and R134a as heat transfer working fluids. Hydrofluoroolefin (HFO) and refrigerants blends have been considered the most environment-friendly refrigerants to replace Chlorofluorocarbons (CFCs), Hydrochlorofluoro-carbons (HCFCs) and Hydrofluorocarbons (HFCs). Their main advantage of zero Ozone Depletion Potential (ODP) and comparatively lower Global Warming Potential (GWP) have attracted growing amount of attention to mitigate environmental issues. This work adopts the computational method and takes the environmentally friendly refrigerants to investigate the heat transfer characteristics under widely used shear-stress transport (SST) model. A comprehensive comparison was performed at reduced pressure of 1.10 for supercritical fluids R515A, R1234ze(E) and R134a. The peaks of heat transfer coefficient occurred in the vicinity of pseudo critical temperature for all of these considered fluids;however, R134a resulted in higher heat transfer coefficient, Reynolds number and Prandtl number in comparison with R515A and R1234ze(E). The higher heat transfer coefficient of supercritical fluid R134a is owing to its thermophysical properties and the specific heat plays crucial role in the heat transfer of supercritical fluids. Owing to environmental issues, R515A can be a considerable replacement of R134a. R1234ze(E) is also promising alternative to R134a;however, safety issues should thoroughly concern its mild flammable characteristics.

关键词： Heat Transfer Supercritical Fluids Simulations R515A R1234ze(E) Environmental Friendly Refrigerants

过程、要害及对策:对OECD统一方法支柱一方案的分析与透视(下)

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国际税收 2021年第2期 35-47页

作者：姜跃生姜奕然国家税务总局税务干部学院苏州大学国际税收战略研究与资讯中心

(接上期)(三)全球汇总与内在冲突全球汇总、公式分配是这次新征税权改革的重大突破。OECD过去对全球汇总的公式分配一直持坚决反对的态度,直到2015年BEPS行动计划最终成果报告,将利息列支限制在跨国公司集团息税前30%的标准算是一个初... 详细信息

(接上期)(三)全球汇总与内在冲突全球汇总、公式分配是这次新征税权改革的重大突破。OECD过去对全球汇总的公式分配一直持坚决反对的态度,直到2015年BEPS行动计划最终成果报告,将利息列支限制在跨国公司集团息税前30%的标准算是一个初步尝试。2019年1月的《政策说明》尚没有涉及这一问题,2月的《公众咨询文件1》中,"用户参与"方案的剩余利润分配按集团的业务线来计算,用约定的百分比划分,"营销型无形资产"方案的剩余利润用销售收入等分配因子分配到市场国。

关键词：剩余利润业务线无形资产征税权分配因子 OECD 销售收入用户参与

Thermophysical Properties and Supercritical Heat Transfer Characteristics of R515A

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Natural Science 2021年第6期13卷 218-234页

作者： Adnan Ibrahim Peng Hu yiran jiang Farrukh Saleem Ali Riaz Yifang Dong Lei Jia Panpan Zhao Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei China School of Engineering Science University of Science and Technology of China Hefei China Department of Mechanical Engineering Pakistan Institute of Engineering and Applied Sciences Islamabad Pakistan Hefei General Machinery Research Institute Co. Ltd. Hefei China

The heat transfer of supercritical fluids is a vastly growing field, specifically to find suitable alternative to replace conventional R134a, which can be beneficial for climate change. A considerable suggestion is R515A which possesses considerably lower global warming potential. The present simulations are designed to study supercritical fluid R515A under cooling conditions in horizontal position. The effect of pressure, mass flux, heat flux and tube diameter were considered for horizontal tube in the vicinity of pseudo critical temperature. Numerical investigations on heat transfer characteristics of supercritical fluid R515A were performed using widely used shear-stress transport (SST) model. Moreover, heat transfer correlations were developed and suggested to accurately predict Nusselt number within 10% accuracy. The simulation results showed about 3.98% average absolute deviation.

关键词： Environmental Friendly Refrigerant Supercritical Fluid R515A Simulations Heat Transfer Correlations Shear-Stress Transport (SST) Model