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Understanding systemic risk induced by climate change

Advances in Climate Change Research 2021年第3期12卷 384-394页

作者： LI Hui-Min wang Xue-Chun ZHAO xiao-Fan QI ye Beijing Climate Change Response Research and Education Center Beijing University of Civil Engineering and ArchitectureBeijing100044China School of Public Policy and Management Tsinghua UniversityBeijing100084China Division of Public Policy The Hong Kong University of Science and TechnologyHong KongChina Institute for Public Policy The Hong Kong University of Science and Technology(Guangzhou)GuangzhouChina

The systemic risk induced by climate change represents one of the most prominent threats facing humanity and has attracted increasing attention since the outbreak of the COVID-19 pandemic at the end of *** existing literature highlights the importance of systemic risk induced by climate change,but there are still deficiencies in understanding its dynamics and assessing the *** to bridge this gap,this study develops a theoretical framework and employs two cases to illustrate the concept,origin,occurrence,propagation,evolution,and assessment framework of systemic risk induced by climate *** key findings include:1)systemic risk induced by climate change derives from the rapid growth of greenhouse gas,emissions,increasingly complex connections among different socioeconomic systems,and continuous changes in exposure and vulnerability;2)systemic risk induced by climate change is a holistic risk generated by the interconnection,interaction,and dynamic evolution of different types of single risks,and its fundamental,defining feature is cascading *** extent of risk propagation and its duration depend on the characteristics of the various discrete risks that are connected to make up the systemic risk;3)impact domains,severity of impact,and probability of occurrences are three core indicators in systemic risk assessment,and the impact domains should include the economy,society,homeland security,human health,and living *** propose to deepen systemic risk research from three aspects:to develop theories to understand the mechanism of systemic risk;to conduct empirical research to assess future risks;and to develop countermeasures to mitigate the risk.

关键词： Systemic risk Climate change Disaster Risk assessment

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Effect of Extra-Framework Titanium in TS-1 on the Ammoximation of Cyclohexanone

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Transactions of Tianjin University 2017年第3期23卷 230-236页

作者： Yaquan wang Shuhai wang Teng Zhang Jiaxin ye xiao wang Dali wang Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Tianjin Synthetic Fiber Company Tianjin 300271China

Titanium silicalite (TS-1) without and with extra-framework titanium have been prepared and TiO2is also prepared under the same conditions. All the samples are characterized with XRD, FT-IR, and UV–Vis. The effects of extra-framework titanium in TS-1 on the ammoximation of cyclohexanone have been studied in a continuous slurry reactor. The characterization results reveal that the extra-framework titanium exists as anatase. The catalytic evaluation results show that the anatase has a positive effect on the ammoximation of cyclohexanone by extending the catalytic life because it also exhibits some activity, while the conversion of cyclohexanone and the selectivity to cyclohexanone oxime are not influenced. The anatase TiO2does not catalyze H2O2decomposition appreciably compared with TS-1 without extra-framework titanium. The results are very useful in guiding the TS-1 production. © 2017, Tianjin University and Springer-Verlag Berlin Heidelberg.

关键词： Network function virtualization Titanium dioxide

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Heuristic algorithm based on the principle of minimum total potential energy(HAPE):a new algorithm for nesting problems

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第11期12卷 860-872页

作者： xiao LIU Jia-wei ye School of Civil and Transportation Engineering South China University of Technology Guangzhou 510640 China

We present a new algorithm for nesting *** equally spaced points are set on a sheet,and a piece is moved to one of the points and rotated by an *** the point and the rotation angle constitute the packing attitude of the *** propose a new algorithm named HAPE(Heuristic Algorithm based on the principle of minimum total Potential Energy) to find the optimal packing attitude at which the piece has the lowest center of *** addition,a new technique for polygon overlap testing is proposed which avoids the time-consuming calculation of no-fit-polygon(NFP).The detailed implementation of HAPE is presented and two computational experiments are *** first experiment is based on a real industrial problem and the second on 11 published benchmark *** a hill-climbing(HC) search method,the proposed algorithm performs well in comparison with other published solutions.

关键词： Packing Cutting Nesting Irregular Heuristic algorithm Minimum total potential energy

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Flow characteristics of silicon oil in nanochannels

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Journal of Hydrodynamics 2021年第6期33卷 1282-1290页

作者： Yong wang Fu-quan Song Kai Ji ye-heng Sun Wei-yao Zhu xiao-hong wang School of Engineering Science University of Science and Technology of ChinaHefei 230026China School of Petrochemical and Energy Engineering Zhejiang Ocean UniversityZhoushan 316022China Exploration and development scientific research institute of Shengli oil field branch of Sinopec Dongying 257015China Civil and Resource Engineering School University of Science and Technology BeijingBeijing 100083China

The nonlinear flow of liquids through nanoscale channels play an important role in the separation and purification properties of porous membranes,the manufacture of biofilm ionic channels and microfluidic chips,the production of micro electro-mechanical *** oil flow experiments were conducted through anodic alumina films with pore sizes of 26,67,89,and 124 nm,in which flow mechanism and characteristics of the oil through the nanoscale channels were *** nanoflow features are revealed:(1)The experimental flow rate is less than the theoretical flow rate through nanochannels,as solid-liquid interaction increasing flow resistance.(2)At small shear rate,the boundary layer is one,indicating existence of a threshold pressure of oil flow through nanochannels.(3)The boundary layer decreases with the increasing of shear rate,and it rapidly decreases as shear rate increases when the value of shear rate is small.(4)The drag coefficient decreases nonlinearly with increasing shear rate,decreasing more slowly when value of shear rate is big,and trending towards 1 in the case of large shear *** is shown that the non-linearity of flow is induced by great solid-liquid interaction in nano and microscale,and increasing the driving force can raise the efficiency at the nanometer scale.

关键词： Nano and microflow nanofluid threshold pressure the boundary layer tight reservoir

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PD-like finite time controller with simple structure for satellite attitude control

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Defence Technology（防务技术） 2023年第8期26卷 123-133页

作者： Li You ye Dong xiao Bing Xidian University Xi'an710126China Harbin Institute of Technology Harbin 150090China Northwestern Polytechnical University Xi'an710072China

A finite time controller with PD-like structure for satellite attitude control is proposed in this *** controller is constructed with simple structure based on standard PD *** fractional order term is designed hence system could both have strong robustness and finite time convergence rate,and the advantage of finite time control and PD control is combined in this *** convergence rate is discussed by Lyapunov method,and the constraint on control parameters is given by implementing the coupled term of angular velocity and attitude ***,the accuracy at steady stage depending on control parameters is given hence system could converge to this field within finite *** stability and performance is demonstrated by numerical simulation results.

关键词： Finite time control PD-like Simple structure Attitude control

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Charting the future:Intelligent and connected vehicles reshaping the bus system

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Journal of Intelligent and Connected Vehicles 2023年第3期6卷 113-115页

作者： Kunjun wang ye xiao Yixu He CRRC Electric Vehicle Co. Ltd.Zhuzhou 412000China School of Information Engineering Chang’an UniversityXi’an 710064China

1 Introduction Driven by technological innovation and digital evolution,the current automotive industry is standing at the cusp of a transformative era(Liu et al.,2023).As urban centers continue to expand and intensify the demands on transportation networks,the need for solutions to alleviate congestion,boost traffic efficiency,and enhance road safety becomes increasingly *** this occasion,intelligent and connected vehicles,integrating vehicles,infrastructure,and cloud computing,promise a smarter mode of passenger transportation and pave the way for a more interconnected and responsive urban transit ecosystem(Cao et al.,2023).Therefore,traditional passenger buses are on the verge of significant transformation in terms of their functional technologies and operational *** will bring about a host of benefits such as higher efficiency,better passenger experiences,and safer road *** paper provides a comprehensive outlook on intelligent and connected passenger buses(ICPBs),delving into the integrated vehicle-road-cloud platform and highlighting the key technologies that will shape the future bus *** illustrated in Fig.1,it showcases the key perspectives on the future of ICPBs.

关键词： connected integrating system

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Geographically and Temporally Weighted Regression in Assessing Dengue Fever Spread Factors in Yunnan Border Regions

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Biomedical and Environmental Sciences 2024年第5期37卷 511-520页

作者： ZHU xiao Xiang wang Song wang LI Yan Fei ZHANG ye Wu SU Xue Mei ZHAO xiao Tao National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases Chinese Center for Disease Control and PreventionBeijing 102211China Yunnan Institute of Parasitic Diseases Pu’er 665000YunnanChina

Objective This study employs the Geographically and Temporally Weighted Regression(GTWR)model to assess the impact of meteorological elements and imported cases on dengue fever outbreaks,emphasizing the spatial-temporal variability of these factors in border *** We conducted a descriptive analysis of dengue fever’s temporal-spatial distribution in Yunnan border *** annual data from 2013 to 2019,with each county in the Yunnan border serving as a spatial unit,we constructed a GTWR model to investigate the determinants of dengue fever and their spatio-temporal heterogeneity in this *** The GTWR model,proving more effective than Ordinary Least Squares(OLS)analysis,identified significant spatial and temporal heterogeneity in factors influencing dengue fever’s spread along the Yunnan ***,the GTWR model revealed a substantial variation in the relationship between indigenous dengue fever incidence,meteorological variables,and imported cases across different *** In the Yunnan border areas,local dengue incidence is affected by temperature,humidity,precipitation,wind speed,and imported cases,with these factors’influence exhibiting notable spatial and temporal variation.

关键词： Dengue fever Meteorological factor Geographically and temporally weighted regression

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Complementary relation between quantum entanglement and entropic uncertainty

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Communications in Theoretical Physics 2021年第1期73卷 18-24页

作者： Yun Cao Dong wang xiao-Gang Fan Fei Ming Zhang-Yin wang Liu ye School of Physics&Material Science Anhui UniversityHefei 230601China CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China

Quantum entanglement is regarded as one of the core concepts,which is used to describe the nonclassical correlation between subsystems,and entropic uncertainty relation plays a vital role in quantum precision *** is well known that entanglement of formation can be expressed by von Neumann entropy of subsystems for arbitrary pure *** interesting question is naturally raised:is there any intrinsic correlation between the entropic uncertainty relation and quantum entanglement?Or if the relation can be applied to estimate the *** this work,we focus on exploring the complementary relation between quantum entanglement and the entropic uncertainty *** results show that there exists an inequality relation between both of them for an arbitrary two-qubit system,and specifically the larger uncertainty will induce the weaker entanglement of the probed system,and vice ***,we use randomly generated states as illustrations to verify our ***,we claim that our observations might offer and support the validity of using the entropy uncertainty relation to estimate quantum entanglement.

关键词： uncertainty relation entanglement of formation concurrence

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Microstructure and tensile properties of Ti-62421S alloy plate with different annealing treatments

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Rare Metals 2018年第7期37卷 568-573页

作者： Yong-Ling wang xiao-Yun Song Wen Ma Wen-Jing Zhang Wen-Jun ye Song-xiao Hui State Key Laboratory of Nonferrous Metals and Processes General Research Institute for Nonferrous Metals Division of Science and Technology Information General Research Institute for Nonferrous Metals

Ti-62421S （Ti-6A1-2Sn-4Zr-2Nb-lMo-0.2Si） is a novel short-time using high-temperature titanium alloy. The effects of annealing on microstructure and tensile properties of Ti-62421S alloy plate were studied through optical microscopy （OM）, electron probe microanalysis （EPMA）, transmission electron microscopy （TEM）, and tensile tests. The results show that, with annealing tem- perature increasing, the volume fraction of primary α（αp）- phase decreases while that of transformed β（βt）-structure and secondary α （αs）-phase increases. The room-temperature strength and plasticity are insensitive to annealing temperature. However, with annealing temperature increasing, the tensile strength decreases at 550℃, while increases at 600 and 650℃ instead. It is suggested that, at 550℃, the strengthening mechanism is mainly boundary strengthening and the biggest contributor is ap-phase by providing αp/β-boundary area. Above 600 ℃, the strengthening mechanism is grain strengthening, where αs-phase strengthens the β-phase.

关键词： High temperature titanium alloy Ti-62421S Heat treatment Microstructure Tensile properties

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Effect of hydraulic fracturing induced stress field on weak surface activation during unconventional reservoir development

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Petroleum Science 2023年第5期20卷 3119-3130页

作者： Jie Bai xiao-Qiong wang Hong-Kui Ge Hu Meng ye-Qun Wen Unconventional Petroleum Research Institute China University of Petroleum(Beijing)Beijing102249China State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China

Unconventional reservoirs usually contain many weak surfaces such as faults,laminae and natural fractures,and effective activation and utilization of these weak surfaces in reservoirs can significantly improve the extraction *** hydraulic fracturing,when the artificial fracture approaches the natural fracture,the natural fracture would be influenced by both the original in-situ stress field and the hydraulic fracturing-induced stress *** this paper,the hydraulic fracturing-induced stress field is calculated based on the relative position of hydraulic fracture and natural fracture,the original in-situ stress,the net pressure inside the hydraulic fracture and the pore pressure of the ***,the stability model of the natural fracture is established by combining the Mohr-Coulomb rupture criterion,and extensive parametric studies are conducted to explore the impact of each parameter on the stability of the natural *** validity of the proposed model is verified by comparing with the reservoir characteristics and fracturing process of the X-well 150e155 formation in the Songliao *** is found that the stress field induced by the hydraulic fracture inhibits the activation of the natural fracture after the artificial fracture crossed the natural ***,for similar reservoirs as X-well 150e155,it is suggested to connect natural fractures with hydraulic fractures first and then activate natural fractures which can effectively utilize the natural fractures and form a complex fracture network.

关键词： Hydraulic fracturing Induced stress field Weak surface Natural fracture stability Fracturing characteristics

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