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Assessing the effectiveness of the intervention measures of COVID-19 in China based on dynamical method

Infectious Disease Modelling 2023年第1期8卷 159-171页

作者： Xiaomeng Wei mingtao li Xin Pei Zhiping liu Juan Zhang Complex Systems Research Center Shanxi University030006ShanxiChina Shanxi Key Laboratory of Mathematical Techniques and Big Data Analysis on Disease Control and Prevention 030006ShanxiChina School of Mathematical Sciences Shanxi University030006ShanxiChina College of Mathematics Taiyuan University of Technology030024ShanxiChina School of Data Science and Technology North University of China030051ShanxiChina

Normalized interventions were implemented in different cities in China to contain the outbreak of COVID-19 before December 2022.However,the differences in the intensity and timeliness of the implementations lead to differences in final size of the infections.Taking the outbreak of COVID-19 in three representative cities Xi'an,Zhengzhou and Yuzhou in January 2022,as examples,we develop a compartmental model to describe the spread of novel coronavirus and implementation of interventions to assess concretely the effectiveness of Chinese interventions and explore their impact on epidemic patterns.After applying reported human confirmed cases to verify the rationality of the model,we apply the model to speculate transmission trend and length of concealed period at the initial spread phase of the epidemic(they are estimated as 10.5,7.8,8.2 days,respectively),to estimate the range of basic reproduction number(2.9,0.7,1.6),and to define two indexes(transmission rate vt and controlled rate vc)to evaluate the overall effect of the interventions.It is shown that for Zhengzhou,vc is always more than v t with regular interventions,and Xi'an take 8 days to achieve vc>v t twice as long as Yuzhou,which can interpret the fact that the epidemic situation in Xi'an was more severe.By carrying out parameter values,it is concluded that in the early stage,strengthening the precision of close contact tracking and frequency of large-scale nucleic acid testing of non-quarantined population are the most effective on controlling the outbreaks and reducing final size.And,if the close contact tracking strategy is sufficiently implemented,at the late stage largescale nucleic acid testing of non-quarantined population is not essential.

关键词： COVID-19 Close contact tracking Large-scale nucleic acid testing Dynamics The basic reproduction number Sensitivity analysis

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Assessment of immunization procedures for foot-and-mouth disease in large-scale pig farms in China based on actual data and dynamics

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Animal Diseases 2022年第1期2卷 45-60页

作者： Huarong Ren Zhen Jin Xin Pei mingtao li You ming Wang Juan Zhang Complex Systems Research Center Shanxi University030006 ShanxiChina Shanxi Key Laboratory of Mathematical Techniques and Big Data Analysis on Disease Control and Prevention 030006 ShanxiChina School of Mathematical Sciences Shanxi University030006 ShanxiChina College of Mathematics Taiyuan University ofTechnology030024 ShanxiChina The Laboratory of Animal Epidemiological Surveillance China Animal Health&Epidemiology Center266032 ShandongChina.

Foot-and-mouth disease(FMD)is an acute,highly infectious and pathogenic animal disease.In recent years,with the rapid development of the swine breeding industry in China,pig farms have shown a trend of larger-scale development.Large-scale pig farms employ standardized management,a high level of automation,and a strict_system.However,these farms have a large trading volume,and increased transmission intensity of FMD is noted inside the farm.At present,the main control measure against FMD is pig vaccination.However,a standard for immunization procedures is not available,and currently adopted immunization procedures have not been effectively and systematically evaluated.Taking a typical large-scale pig farm in China as the research subject and considering the breeding pattern,piggery structure,age structure and immunization procedures,an individual-based state probability model is established to evaluate the effectiveness of the immune procedure.Based on numerical simulation,it is concluded that the optimal immunization program involves primary immunization at 40 days of age and secondary immunization at 80 days of age for commercial pigs.Breeding boars and breeding sows are immunized 4 times a year,and reserve pigs are immunized at 169 and 259 days of age.According to the theoretical analysis,the average control reproduction number of individuals under the optimal immunization procedure in the farm is 0.4927.In the absence of immunization,the average is 1.7498,indicating that the epidemic cannot be controlled without immunization procedures.

关键词： Pig farm Foot-and-mouth disease Individual-based state probability model Immunization procedure Infection probability Individual-based control reproduction number

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Tuning the local electronic structure of oxygen vacancies over copper-doped zinc oxide for efficient CO_(2) electroreduction

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eScience 2022年第5期2卷 518-528页

作者： Ke Wang Dongyu liu limin liu Jia liu XiaoFei Hu Ping li mingtao li Andrey S.Vasenko Chunhui Xiao Shujiang Ding Xi'an Key Laboratory of Sustainable Energy Materials Chemistry School of ChemistryEnergy Storage Materials and Chemistry of Shaanxi University Engineering Research CenterXi'an Jiaotong University28 Xianning West RoadXi'an710049China International Research Center for Renewable Energy(IRCRE) State Key Laboratory of Multiphase Flow in Power Engineering(MFPE)Xi'an Jiaotong University28 Xianning West RoadXi'anShaanxi710049China HSE University 101000MoscowRussia College of Materials and Environmental Engineering Hangzhou Dianzi UniversityHangzhou310018PR China CNNC Shaanxi Uranium Enrichment Co. Ltd.HanzhongChina

Oxygen vacancies in metal oxides can serve as electron trap centers to capture CO_(2) and lower energy barriers for the electrochemical CO_(2) reduction reaction(CO_(2)RR).Under aqueous electrolytes,however,such charge-enriched active sites can be occupied by adsorbed hydrogen(H∗)and lose their effectiveness for the CO_(2)RR.Here,we develop an efficient catalyst consisting of Cu-doped,defect-rich ZnO(Cu–ZnO)for the CO_(2)RR,which exhibits enhanced CO Faradaic efficiency and current density compared to pristine ZnO.The introduced Cu dopants simultaneously stabilize neighboring oxygen vacancies and modulate their local electronic structure,achieving inhibition of hydrogen evolution and acceleration of the CO_(2)RR.In a flow cell test,a current density of more than 45mAcm^(−2) and a CO Faradaic efficiency of>80%is obtained for a Cu–ZnO electrocatalyst in the wide potential range of−0.76V to−1.06V vs.Reversible Hydrogen Electrode(RHE).This work opens up great opportunities for dopant-modulated metal oxide catalysts for the CO_(2)RR.

关键词： CO_(2)electroreduction Oxygen vacancy Heteroatom doping Metal oxide catalysts

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Pressure-induced superconductivity at 32 K in MoB2

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National Science Review 2023年第5期10卷 215-220页

作者： Cuiying Pei Jianfeng Zhang Qi Wang Yi Zhao lingling Gao Chunsheng Gong Shangjie Tian Ruitao Luo mingtao li Wenge Yang Zhong-Yi Lu Hechang Lei Kai liu Yanpeng Qi School of Physical Science and Technology Shanghai Tech University Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of China Shanghai Tech Laboratory for Topological Physics Shanghai Tech University Center for High Pressure Science and Technology Advanced Research Shanghai Key Laboratory of High-resolution Electron Microscopy Shanghai Tech University

Since the discovery of superconductivity in MgB2(Tc～ 39 K),the search for superconductivity in related materials with similar structures or ingredients has never stopped.Although about 100 binary borides have been explored,only a few of them show superconductivity with relatively low Tc.In this work,we report the discovery of superconductivity up to 32 K,which is the highest Tcin transition-metal borides,in MoB2under pressure.The Tcof MoB2in the α phase can be well explained by theoretical calculations in the framework of electron-phonon coupling.Furthermore,the coupling between the d electrons of Mo and the out-of-plane Mo-phonon modes are the main driving force of the 32 K superconductivity of MoB2.Our study sheds light on the exploration of high-Tcsuperconductors in transition metal borides.

关键词： superconductivity high pressure borides

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吡咯基三嗪聚合框架用于固相转变硫聚物正极性能研究

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新能源进展 2024年第3期12卷 241-248页

作者：易义坤李明涛西安交通大学化学工程与技术学院西安710049

针对锂硫电池存在严重穿梭效应的问题,硫物质的固相转变可有效消除多硫化锂在液相中的溶解扩散。以聚丙烯腈为代表的常规链状聚合物可通过共价结合短链硫实现固相转变,然而往往受到硫含量低、倍率性能差的限制。通过氰基三聚与吡咯自由... 详细信息

针对锂硫电池存在严重穿梭效应的问题,硫物质的固相转变可有效消除多硫化锂在液相中的溶解扩散。以聚丙烯腈为代表的常规链状聚合物可通过共价结合短链硫实现固相转变,然而往往受到硫含量低、倍率性能差的限制。通过氰基三聚与吡咯自由基聚合构筑了吡咯基三嗪聚合物框架(P-CNPy),其硫含量较高,达到47%。电化学测试结果显示硫聚物正极具有优异的循环稳定性与倍率性能,0.2C循环500次平均容量衰减仅为0.03%,4C时可逆容量仍保留580mA∙h/g。该方法可为高性能二维框架结构硫聚物正极的设计应用提供指导。

关键词：固相转变聚合物框架硫聚物正极循环稳定性

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Dehydro-Diels-Alder reaction and diamondization of bowl-shaped clusters C_(18)Te_(3)Br_(4)(Bu-O)_(6)

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Nano Research 2022年第5期15卷 4606-4612页

作者： Jinbo Zhang Manli Ma Rong Zhou Hongqiang Chu Xue Wang Shaojie Wang Huhu Tian Zhipeng Yan mingtao li Zhongyan Wu Bin li Jiafeng Yan Lan Anh Thi Nguyen Rongxing Cao Guoqing Wu Xianghua Zeng Hao-li Zhang Jaeyong Kim lin Wang Yongjun Tian College of Physical Science and Technology Yangzhou UniversityYangzhou 225002China Center for High Pressure Science(CHiPS) State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China State Key Laboratory of Applied Organic Chemistry Lanzhou UniversityLanzhou 730000China Baotou Research Institute of Rare Earths Baotou 014000China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China Center for High Pressure Science and Technology Advanced Research Shanghai 201203China Department of Physics and High Pressure Research CenterHanyang UniversitySeoul 04763Republic of Korea

Dehydro-Diels-Alder(DDA)reaction is a textbook reaction for preparing six-membered rings in solution but is scarcely seen in solid-state synthesis.In this work,using multiple characterization techniques,we demonstrate that the bowl-shaped clusters C_(18)Te_(3)Br_(4)(Bu-O)_(6) might experience a DDA reaction at room temperature and high pressure between 5.5 and 7.4 GPa.Above 17.0 GPa,it is found that the bonding conversion from the intramolecular sp^(2) to the intermolecular spa occurred,in the form of pressure-induced diamondization.The recovered samples from 20.0 and 36.1 GPa showed incomplete reversibility,while the decompression-induced graphitization of glassy carbon was observed during decompression from 46.5 GPa.The electrochemical impedance spectroscopy results indicated that the transport properties changed from grain boundary dominant to grain dominant due to the DDA reaction and the grain boundary effect disappeared as the intermolecular sp3 bonding building-up and carrier transmission channel formation above 17.0 GPa.The results in this study open a new route to construct the crystalline carbon materials with different transport properties.

关键词： polycyclic aromatic hydrocarbons dehydro-Diels-Alder reaction diamondization high-pressure

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川南地区龙马溪组复杂岩相类型页岩储层有机质差异性成孔机制

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天然气地球科学 2024年第1期35卷 133-148页

作者：林伟郭伟张吉振李明涛长江大学地球科学学院湖北武汉430100 临沂大学数字地质与能源研究院山东临沂276000 临沂大学资源环境学院(碳中和学院) 山东临沂276000 中国石油勘探开发研究院北京100083 长江大学资源与环境学院湖北武汉430100

四川盆地龙马溪组页岩气资源丰富,已实现了大规模商业开发,成藏地质理论研究也取得重大进展。然而,页岩储层岩相类型多、纵横向变化快、非均质性强,制约储层精细评价及资源量的有效评估。页岩微观孔隙发育特征刻画是储层评价及优选的关... 详细信息

四川盆地龙马溪组页岩气资源丰富,已实现了大规模商业开发,成藏地质理论研究也取得重大进展。然而,页岩储层岩相类型多、纵横向变化快、非均质性强,制约储层精细评价及资源量的有效评估。页岩微观孔隙发育特征刻画是储层评价及优选的关键,尤其作为页岩气赋存、富集的重要空间的有机质孔隙,明确不同岩相页岩有机质孔隙发育特征差异具有重要意义。以川南地区泸州区块龙马溪组页岩为研究对象,基于X射线衍射矿物分析、铸体薄片鉴定,甄别出研究区龙一1亚段1~3小层发育硅质页岩、含黏土硅质页岩、含钙硅混合页岩、混合页岩、硅质岩及钙质页岩等6种岩相类型,揭示出不同岩相类型微观储集特征存在较大差异。采用全视域拼接扫描(MAPS)技术,提取有机质及有机质孔隙并进行精细定量表征,发现不同岩相类型页岩在有机质成孔率、有机质面孔率、圆度、长宽比等发育特征方面差异显著,指出硅质页岩有机质成孔效率高、面孔率大、有机质孔隙圆度好、含气量及脆性指数高,是页岩气赋存富集的最有利岩相类型,其次为含黏土硅质页岩及硅质岩,而钙质页岩相为非优势岩相类型。研究结果可为有效储层评价及优选、页岩气富集区预测和勘探开发部署提供科学理论依据和支撑。

关键词：川南地区深层页岩气龙马溪组岩相类型有机孔

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Bacterial Cellulose Composite Solid Polymer Electrolyte With High Tensile Strength and lithium Dendrite Inhibition for Long life Battery

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Energy & Environmental Materials 2021年第3期4卷 434-443页

作者： Yuhan li Zongjie Sun Dongyu liu Shiyao Lu Fei li Guoxin Gao Min Zhu mingtao li Yanfeng Zhang Huaitian Bu Zhiyu Jia Shujiang Ding Department of Applied Chemistry School of ChemistryXi’an Key Laboratory of Sustainable Energy Materials ChemistryMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterState Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of Materials and Nanotechnology SINTEF IndustryForskningsveien 1Oslo 0373Norway School of Chemistry and Chemical Engineering MOE Key Laboratory of Cluster ScienceBeijing Institute of TechnologyBeijing 100081China

The development of metallic lithium anode is restrained by lithium dendrite growth during cycling.The solid polymer electrolyte with high mechanical strength and lithium ion conductivity could be applied to inhibit lithium dendrite growth.To prepare the high-performance solid polymer electrolyte,the environment-friendly and cheap bacterial cellulose(BC)is used as filler incorporating with PEO-based electrolyte owing to good mechanical properties and li salts compatibility.PEO/li TFSI/BC composite solid polymer electrolytes(CSPE)are prepared easily by aqueous mixing in water.The lithium ion transference number of PEO/li TFSI/BC CSPE is 0.57,which is higher than PEO/li TFSI solid polymer electrolyte(SPE)(0.409).The PEO/li TFSI/BC CSPE exhibits larger tensile strength(4.43 MPa)than PEO/li TFSI SPE(1.34 MPa).The electrochemical window of composite electrolyte is widened 1.43 V by adding BC.Density functional theory calculations indicate that flex of PEO chains around li atoms is suppressed,suggesting the enhanced lithium ion conductivity.Frontier molecular orbitals results suggest that an unfavorable intermolecular charge transfer lead to achieve higher potential for BC composite electrolyte.All solid-state li metal battery with PEO/li TFSI/BC CSPE delivers longer cycle life for 600 cycles than PEO/li TFSI SPE battery(50 cycles).li symmetrical battery using PEO/li TFSI/BC CSPE could be stable for 1160 h.

关键词： all solid-state battery bacterial cellulose composite polymer electrolyte DFT calculations HOMO and LUMO

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MoS2 nanorods with inner caves through synchronous encapsulation of sulfur for high performance li–S cathodes

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Journal of Energy Chemistry 2020年第6期29卷 18-24,I0002页

作者： Yikun Yi Zechen liu Pu Yang Tao Wang Xuewen Zhao Hongyang Huang Yonghong Cheng Jinying Zhang mingtao li Shaanxi Key Laboratory of Energy Chemical Process Intensification School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an 710049ShaanxiChina State Key Laboratory of Electrical Insulation and Power Equipment Center of Nanomaterials for Renewable Energy(CNRE)School of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina Guangdong Xi’an Jiaotong University Academy Foshan 528300GuangdongChina School of Environment and Architecture Dongguan University of TechnologyDongguan 523808GuangdongChina

lithium–sulfur(li–S)batteries have become one of the most promising candidates for next-generation batteries owing to their high specific capacity,low cost,and environment-friendliness.Many efforts have been made to mitigate the"shuttle effect"through physical adsorption and chemical bonding.MoS2 has been proposed as a cathode material to provide effective anchoring sites for lithium polysulfides(li PSs),but is still limited by its layer structure.Herein,we designed novel MoS2 nanorods with inner caves based on our previous work,and performed synchronous encapsulation of sulfur during the synthesis process.The outer MoS2 tubular shells physically inhibit the outward diffusion of polysulfide species while the inner particles chemically anchor the polysulfides to prevent shuttling.As the cathode matrix in li–S batteries,the electrochemical results deliver a high initial discharge capacity of 1213 mAhg^-1 for sulfur at 0.1 C.After cycling at 1 C for 300 cycles,the cells exhibit a capacity decay of only 0.076%per cycle and high average coulombic efficiency over 95%.The tubular MoS2 structure is an innovative and appealing design,which could be regarded as a prospective substrate for the improved performance of li–S batteries.

关键词： MoS2 nanorod Inner caves Synchronous encapsulation of sulfur Cathode matrix

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TiO_(2) nanorods based self-supported electrode of 1T/2H MoS_(2) nanosheets decorated by Ag nano-particles for efficient hydrogen evolution reaction

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Chinese Chemical Letters 2023年第11期34卷 355-359页

作者： Changzheng lin Yunpeng liu Yaxing Sun Zhenyu Wang Hao Xu mingtao li Jiangtao Feng Bo Hou Wei Yan Department of Environmental Science&Engineering Xi’an Jiaotong UniversityXi’an 710049China School of Physics and Astronomy Cardiff UniversityThe ParadeCardiffCF243AAWalesUnited Kingdom State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China International Research Center for Renewable Energy(IRCRE) State Key Laboratory of Multiphase Flow in Power Engineering(MFPE)Xi’an Jiaotong UniversityXi’an 710049China

Molybdenum disulfide(MoS_(2))has shown significant promise as an economic hydrogen evolution reaction(HER)catalyst for hydrogen generation,but its catalytic performance is still lower than noble metalbased catalysists.Herein,a silver nanoparticles(Ag NPs)-decorated 1T/2H phase layered MoS_(2) electrocatalyst grown on titanium dioxide nanorod arrays(Ag NPs/1T(2H)MoS_(2)/TNRs)was prepared through acid-tunable ammonium ion intercalation.Taking advantage of MoS_(2) layered structure and crystal phase controllability,as-prepared Ag NPs/1T(2H)MoS_(2)/TNRs exhibited ultrahigh HER activity.As-proposed strategy combines facile hydrogen desorption(Ag NPs)with efficient hydrogen adsorption(1T/2H MoS_(2))effectively circumventes the kinetic limitation of hydrogen desorption by 1T/2H MoS_(2).The as-prepared Ag NPs/1T(2H)MoS_(2)/TNRs electrocatalyst exhibited excellent HER activity in 0.5 mol/L H2SO4 with low overpotential(118 mV vs.reversible hydrogen electrode(RHE))and small Tafel slope(38.61 mV/dec).The overpotential exhibts no obvious attenuation after 10 h of constant current flow.First-principles calculation demonstrates that as-prepared 1T/2H MoS_(2) exhibit a large capacity to store protons.These protons can be subsequently transferred to Ag NPs,which significantly increases the hydrogen coverage on the surface of Ag NPs in HER process and thus change the rate-determining step of HER on Ag NPs from water dissociation to hydrogen recombination.This study provides a unique strategy to improve the catalytic activity and stability for MoS_(2)-based electrocatalyst.

关键词： Molybdenum disulfide Silver nanoparticles Hydrogen evolution reaction Density functional theory Hydrogen spillover

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