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Nano Research 2023年第4期16卷 4793-4802页

作者： Weiyuan Ding Ali Saad Yuchen Wu Zhiwei Wang xiuting li Institute for Advanced Study Shenzhen UniversityShenzhen 518060China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China

Rational construction of active components has been the biggest challenge in preparing efficient bifunctional oxygen electrocatalysts.Herein,electrospinning and chemical vapor deposition(CVD)were employed to embed active species including FeCo nanoparticles,MNx(M=Fe,Co),and FePx in porous and graphitized carbon nanotubes(CNTs)/carbon nanofiber(CNF).The as-prepared FeCo@CoNx@FePx/C exhibited a half-wave potential as high as 0.86 V in oxygen reduction reaction(ORR)and low oxygen evolution reaction(OER)overpotential of 368 mV at 10 mA·cm^(−2),which are superior to Pt/C(0.83 V)and IrO_(2)(375 mV)respectively.The assembled Zn-air battery(ZAB)showed a high energy efficiency(Edischarge/Echarge)of 65%at 20 mA·cm^(−2)and stabilized for 700 charge-discharge cycles.The spectroscopic and microscopic characterizations evidenced that the outstanding bifunctionality of the electrocatalyst can be ascribed to three main reasons:First,FeCo nanoparticles are rich in MOH/MOOH active sites for OER,and FePx/CNTs constructed with CVD also modulate electronic structure to improve electron transfer;second,both MNx in carbon matrix and FePx/CNTs are highly active towards ORR;third,the CNTs/CNF are highly porous and graphitized,which promotes mass transport and improves electrical conductivity and stability of the electrocatalysts.This work gives important implications on the design of bifunctional electrocatalysts.

关键词： carbon nanotubes(CNTs)/carbon nanofiber(CNF)-supported multi-active components oxygen reduction reaction oxygen evolution reaction zinc-air battery

Controllable Strong and Ultralight Aramid Nanofiber‑Based Aerogel Fibers for Thermal Insulation Applications

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Advanced Fiber Materials 2022年第5期4卷 1267-1277页

作者： Mengmeng li Xian Chen xiuting li Jie Dong Xin Zhao Qinghua Zhang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620People’s Republic of China

High-performance polymer-based aerogel fibers with ultrahigh porosity,mechanical robustness and outstanding thermal stability are demanded for applying in effective thermal insulation devices,especially in harsh environment.However,the poor mechanical properties and thermal stability of the commonly reported polymer-based aerogel fibers restricted their applications in many areas.As a special nano-build-block,aramid nanofiber-based aerogel fiber is expected to conquer this problem in virtue of the outstanding performance,intrinsically related to aramid fibers.Herein,a series of aramid nanofiber-based aerogel fibers were fabricated via a facial wet-spinning method combined with freeze-drying technique.The effects of coagulation bath temperature and the solid contents of the spinning precursors on their morphologies and mechanical properties were systematically studied.The obtained aerogel fibers possessed high porosity(>92%),good mechanical prop-erties(tensile strength~8.1 MPa)and high specific surface area(~239 m^(2)/g).Meanwhile,the woven textiles exhibited a low thermal conductivity(~34 mW/(m·K))and outstanding thermal insulation properties under a wide range of temperature.In addition,surface modification by Teflon resin could make the ANAFs hydrophobic,thus exhibiting their applicational pros-pects in a humid environment.Overall,the aramid nanofiber-based aerogel fibers and their textile throw light in a favorable direction for developing high-performance thermal insulation fibers and textiles.

关键词： ANFs High mechanical properties Aerogel fiber Thermal insulation

Measuring China's Real Estate Financial Innovation from the Perspective of Government,Enterprises and the Public:Index Compilation and Its Spatial-Temporal Characteristics Analysis

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Journal of Systems Science and Information 2023年第1期11卷 1-34页

作者： Jichang DONG lijun YIN Xiaoting liU xiuting li School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Key Laboratory of Big Data Mining and Knowledge Management Chinese Academy of SciencesBeijing 100190China China Construction Second Engineering Bureau Co.Ltd Beijing 100070China

In recent years,China has witnessed the rapid development in housing finance,and there have emerged constantly real estate finance innovations;however,there exists no relevant index for measuring the innovations of China's real estate finance.Based on the perspectives of the governments,enterprises and the public,this paper constructs the"innovation index of real estate finance"on a quarterly basis from 2009 to 2019,with the method of empowerment which combines the subjective method(analytic hierarchy process)and the objective one(range coefficient method).It clearly and concretely depicts the innovations in housing finance and the related temporal-spatial characteristics in China since the outbreak of the financial crisis in 2008.The index covers 30 provinces,autonomous regions and municipalities directly under the central government,and analyzes its temporal and spatial characteristics.The findings show that there exist a strong spatial autocorrelation and a big regional difference in innovations.

关键词： governments enterprises public real estate finance innovation

Do Media Reports Matter to House Price Expectations?Evidence from Beijing

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Journal of Systems Science and Information 2022年第4期10卷 388-409页

作者： Jing HE Diandian MA xiuting li Jichang DONG Postdoctoral Research Center of Agricultural Bank of China Beijing 100005China School of Statistics Renmin University of ChinaBeijing 100872China School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Key Laboratory of Big Data Mining and Knowledge Management Chinese Academy of SciencesBeijing 100190China

House price expectations(HPE)is a key factor affecting housing market fluctuations.Taking Beijing as an example,this study innovatively proposes an internet data-based measurement of HPE and text analysis-based quantification of media reports from media attention and media attitudes.Regression model is performed to empirically test the impact of media reports on the level and accuracy of HPE.The empirical results show no significant relationship between media attention and the level of HPE,but a significant relationship to the accuracy of HPE.The higher the media attention(i.e.,the more intensive the media reports),the smaller the deviation between HPE and actual housing prices.The attitude of media reports is significantly related to the level and accuracy of HPE.It is easier to guide the formation of HPE through media reports with clear opinions,indicating that media could promote the sustainable development of the real estate market.

关键词： media reports real estate market housing prices public expectations

Tough polyimide composites synergistically reinforced by carbon nanofiber-grafted carbon fiber and rGO for improved heat dissipation and electromagnetic interference shielding

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Journal of Materials Science & Technology 2023年第18期149卷 225-236页

作者： Zhiqiang Wu Jie Dong xiuting li Xin Zhao Wenjun Tan Chengchang Ji Qinghua Zhang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province College of Chemical and Materials EngineeringXuchang UniversityXuchang 461000China

The rapid miniaturization and a consequent increase in electromagnetic wave(EM)and heat emission in integrated electronic devices are now urgently desiring for multifunctional polymer composites that simultaneously possess high mechanical properties,excellent electromagnetic interference(EMI)shield-ing ability and heat dissipation capability.Herein,a series of novel polyimide-based composite films were constructed by rationally assembling the carbon nanofiber-grafted carbon fiber(NCF)and reduced graphene oxide(rGO)into a highly electrically and thermally conductive pathway within polyimide ma-trix via a sequential bidirectional freezing casting and hot-pressing strategy.The combination of high tensile strength and toughness was obtained by incorporating rGO into the NCF-reinforced PI composite,giving rise to a hierarchical reinforcing structure of NCF and crack deflection induced by rGO nanosheets.The high electrical conductivity(7.0×10^(3) S m^(-1))endows the PI/NCF30/rGO3.5 composite film with a good EMI shielding effectiveness of 45 dB.Moreover,the well-aligned thermally conductive NCF and rGO and strong interfacial bonding between the polymer matrix and reinforcing fibers give rise to improved thermal conductivity(λ),particularly along the in-plane direction.Typically,the PI/NCF30/rGO3.5 exhibits an in-plane thermal conductivity of 5.18 W m^(-1) K^(-1),∼4.7 times increment compared to the pure PI(0.91 W m^(-1) K^(-1)).Besides,the resultant PI/NCF30/rGO3.5 composite film presents a superior Joule heat-ing performance with some features of fast thermal response,ease of regulation and sufficient reliability.Accordingly,the developed multifunctional polyimide-based composite films demonstrate high potential as advanced EMI shielding materials with excellent heat dissipation.

关键词： Polyimide nanocomposites Mechanical performance Emi shielding Heat dissipation

Grain Science and Technology Policies and Food Security in China:An Empirical Study Based on a Provincial Dynamic Panel Model

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Journal of Systems Science and Information 2020年第6期11卷 504-523页

作者： Changhong NIE Mingming CUI xiuting li Institute of Zoology Chinese Academy of SciencesBeijing 100101China School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Key Laboratory of Big Data Mining and Knowledge Management Chinese Academy of SciencesBeijing 100190China

China’s grain science and technology policies have played an important role in the development of China’s food industry.This paper aims to examine the effects of China’s grain science and technology policies on food security.It quantitatively assesses China’s food security by analyzing the main contents and development trends of China’s food science technology policies through the text metrology method,and then investigates the effects of grain science and technology policies on food security by employing a provincial dynamic panel model.The results show that food security in China is all-round developed,and that the release frequency and cumulative effect of grain science and technology policies play a significant role in promoting food security.Powerful grain science and technology policies can effectively guarantee China’s food security.

关键词： grain science and technology policy food security dynamic panel regression policy effect

Development and Validation of a Prognostic Risk Score System for COVID-19 Inpatients:A Multi-Center Retrospective Study in China

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Engineering 2022年第1期8卷 116-121页

作者： Ye Yuan Chuan Sun Xiuchuan Tang Cheng Cheng Laurent Mombaerts Maolin Wang Tao Hu Chenyu Sun Yuqi Guo xiuting li Hui Xu Tongxin Ren Yang Xiao Yaru Xiao Hongling Zhu Honghan Wu Kezhi li Chuming Chen Yingxia liu Zhichao liang Zhiguo Cao Hai-Tao Zhang Ioannis Ch.Paschaldis Quanying liu Jorge Goncalves Qiang Zhong li Yan School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhan 430074China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Luxembourg Centre for Systems Biomedicine University of LuxembourgBelval L-4367Luxembourg Department of Plant Sciences University of CambridgeCambridge CB21TNUK Department of Emergency Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China AMITA Health Saint Joseph Hospital Chicago ChicagoIL 60657USA Department of Anesthesiology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Huazhong University of Science and Technology-Wuxi Research Institute Wuxi 214174China Division of Cardiology Department of Internal MedicineTongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Institute of Health Informatics University College LondonLondon NW12DAUK Department of Biomedical Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Infectious Diseases Shenzhen Key Laboratory of Pathogenic Microbiology and ImmunologyNational Clinical Research Center for Infectious DiseaseThe Third People’s Hospital of Shenzhen(Second Hospital Affiliated with the Southern University of Science and Technology)Shenzhen 518055China Department of Electrical and Computer Engineering&Division of Systems Engineering&Department of Biomedical Engineering Boston UniversityBostonMA 02215USA

Coronavirus disease 2019(COVID-19)has become a worldwide pandemic.Hospitalized patients of COVID-19 suffer from a high mortality rate,motivating the development of convenient and practical methods that allow clinicians to promptly identify high-risk patients.Here,we have developed a risk score using clinical data from 1479 inpatients admitted to Tongji Hospital,Wuhan,China(development cohort)and externally validated with data from two other centers:141 inpatients from Jinyintan Hospital,Wuhan,China(validation cohort 1)and 432 inpatients from The Third People’s Hospital of Shenzhen,Shenzhen,China(validation cohort 2).The risk score is based on three biomarkers that are readily available in routine blood samples and can easily be translated into a probability of death.The risk score can predict the mortality of individual patients more than 12 d in advance with more than 90%accuracy across all cohorts.Moreover,the Kaplan-Meier score shows that patients can be clearly differentiated upon admission as low,intermediate,or high risk,with an area under the curve(AUC)score of 0.9551.In summary,a simple risk score has been validated to predict death in patients infected with severe acute respiratory syndrome coronavirus 2(SARS-CoV-2);it has also been validated in independent cohorts.

关键词： COVID-19 Risk score Mortality risk prediction

Effect of AAPH oxidation on digestion characteristics of seed watermelon(Citrullus lanatus var)kernels protein isolates

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Food Science and Human Wellness 2020年第4期9卷 402-410页

作者： Shugang li Zhihao li xiuting li Ping Wang Xiongwei Yu Qinli Fu Sihai Gao School of Food and Biological Engineering Hefei University of TechnologyHefei230009China Key Laboratory of Fermentation Engineering Ministry of EducationGlyn O.Phillips Hydrophilic Colloid Research CenterFaculty of Light IndustrySchool of Food and Biological EngineeringHubei University of TechnologyWuhan430068China Beijing Technology and Business University Beijing100048China Huazhong Agriculture University Wuhan430070China Wuhan Xudong Food Co. Ltd.Wuhan 430000China Department of Cardiothoracic and Vascular Surgery Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030HubeiChina

Seed watermelon kernel is a typical complex food with high fat and protein contents.During storage and processing,it is often affected by various factors to undergo interactions between components,which lead to its quality change.In this experiment,seed watermelon kernels were used as research objects,and the effects of 2-Azobis(2-amidinopropane)dihydrochloride(AAPH)on seed watermelon kernel protein isolates(WMP)were investigated.The structure and digestion characteristics of WMP after oxidation were studied.The results showed that with the increase of AAPH concentration(0.05−5 mol/L),WMP showed obvious aggregation,and its solubility decreased from 6.76 mg/mL to 9.59 mg/mL.The free sulfhydryl content of WMP was 18.24 mmol/g decreased to 11.25 mmol/g,α-helix decreased andβ-sheet decreased in secondary structure,and its disulfide bond increased by 43.06 mmol/g from 39.57 mmol/g,enthalpy(H)and denaturation temperature increased(Td)(Plipid oxidation product APPH of seed watermelon kernel can significantly affect the structure and function of the protein extracted from the seed kernel.

关键词： Seed watermelon kernel protein Digestion characteristics AAPH oxidation

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全国统一大市场与出口企业供应链韧性

世界经济与政治论坛 2024年第4期 103-121页

作者：刘益宁潘昌蔚李秀婷青岛大学经济学院南开大学经济学院厦门工学院商学院商务部国际贸易经济合作研究院

全国统一大市场建设是构建双循环发展格局的关键一环,能够有效借助国内市场优势保障出口供应链安全,推动国民经济高质量发展。本文以中国A股上市公司出口企业为研究样本,考察了全国统一大市场建设对出口企业供应链韧性的影响及其作用机... 详细信息

全国统一大市场建设是构建双循环发展格局的关键一环,能够有效借助国内市场优势保障出口供应链安全,推动国民经济高质量发展。本文以中国A股上市公司出口企业为研究样本,考察了全国统一大市场建设对出口企业供应链韧性的影响及其作用机制。研究发现:全国统一大市场建设显著提升了出口企业供应链韧性。机制检验表明,优化资源配置、降低信息不对称是全国统一大市场建设影响出口企业供应链韧性的主要路径。异质性分析发现,全国统一大市场建设对出口企业供应链韧性的促进作用对产业集聚较高地区、竞争程度激烈行业、小规模企业更为明显。本文研究结论为全国统一大市场建设保障出口企业产业链供应链安全、改善出口企业供应链表现提供了重要的经验证据。

关键词：全国统一大市场供应链韧性出口企业资源配置信息不对称

A Study on the Relationship Between Land Finance and Housing Price in Urbanization Process: An Empirical Analysis of 182 Cities in China Based on Threshold Panel Models

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Journal of Systems Science and Information 2021年第1期9卷 74-94页

作者： Meiting HU Jichang DONG lijun YIN Chun MENG xiuting li School of Econormics and Management University of Chinese Acaderny of SciencesBeijing 100190China School of Econormics and Management Universily of Chinese Acadermy of SciencesBeijing 100190China School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Development Research Centre of the State Council Beijing 100010China School of Econormics and Management University of Chinese Academy of SciencesBeijing 100190China

Scholars have a variety of theoretical explanations for housing price growth. However, few scholars have studied the internal influence mechanism among urbanization, land finance, and housing price. Based on the data of 182 prefecture-level cities from 2009 to 2016, this paper studies the influence of land finance on housing price under different urbanization rate levels. The study finds that with the increase of urbanization rate, the effect of land finance on housing price presents a "U" shape.Specifically, an increase in land finance by 1% results in a corresponding increase in average housing price by 0.18%, with relatively low urbanization rate, 0.06% with medium level of urbanization rate,and 0.38% with high level of urbanization rate.

关键词： urbanization land finance housing price threshold panel model