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The Commutators of Strongly Singular Integral Operators on the Weighted Hardy Spaces

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Acta Mathematica Sinica,English Series 2021年第12期37卷 1909-1920页

作者： Yan Yan HAN huo Xiong WU School of Mathematical Sciences Xiamen UniversityXiamen 361005P.R.China

Let T be a strongly singular Calderon-Zygmund operator and b∈L_(loc)(R^(n)).This article finds out a class of non-trivial subspaces BMO_(ω,p,u)(R^(n))of BMO(R^(n))for certain ω∈A_(1),0 详细信息

Let T be a strongly singular Calderon-Zygmund operator and b∈L_(loc)(R^(n)).This article finds out a class of non-trivial subspaces BMO_(ω,p,u)(R^(n))of BMO(R^(n))for certain ω∈A_(1),0

关键词： Strongly singular Calderon-Zygmund operators commutators Muckenhoupt weights BMO spaces Hardy spaces

Coping with the Bullwhip Effect Using Inventory or Cash: An Environment-Behavior-Performance Paradigm

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Journal of Systems Science and Systems Engineering 2021年第2期30卷 215-235页

作者： Baile Lu Qihui Gong Baofeng huo Weihua Zhou School of Management Zhejiang UniversityHangzhou 310058China

The bullwhip effect is w idely found in business and exerts adverse effects on business *** investigate the influence of the bullwhip effect on firm s'performance and their responses,this study proposed an environment-behavior-performance analysis fram ework and offered a new perspective for studying the bullwhip *** data collected from 1,734 listed manufacturers in China from 2002 to 2017,we adopted regression models to test the proposed m odel and conducted a series of robustness *** find that the bullwhip effect is positively related to operating risk,inventory,and cash holdings,and the moderate levels of inventory and cash are negatively associated with operating ***,inventory and cash play different roles and work together to alleviate operating risk induced by the bullwhip ***,excess resource holdings are positively associated with operating ***,firm swith different levels of resources should hold suitable levels of inventory,cash,or both as contingent responses to the bullwhip effect.

关键词： Bullwhip effect inventory holding cash holding operating risk

Robust Interval State Estimation for Distribution Systems Considering Pseudo-measurement Interval Prediction

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 179-188页

作者： Xu Zhang Wei Yan Meiqing huo Hui Li the School of Electrical Engineering Chongqing UniversityChongqing 400044China

Interval state estimation(ISE)can estimate state intervals of power systems according to confidence intervals of predicted pseudo-measurements,thereby analyzing the impact of uncertain pseudo-measurements on ***,predicted pseudo-measurements have prediction errors,and their confidence intervals do not necessarily contain the truth values,leading to estimation biases of the *** solve this problem,this paper proposes a pseudo-measurement interval prediction framework based on the Gaussian process regression(GPR)model,thereby improving the prediction accuracy of pseudo-measurement confidence ***,a weight assignment strategy for improving the robustness of weighted least squares(WLS)ISE is *** strategy quantifies the deviation between the pseudo-measurement intervals and their estimated intervals and assigns smaller weights to the pseudo-measurement intervals with larger deviations,thereby improving the estimation accuracy and robustness of the *** paper adopts the data from the supervisory control and data acquisition(SCADA)system of the New York Independent System Operator(NYISO).It verifies the advantages of the GPR method for pseudo-measurement interval prediction by comparing it with the quantile regression and neural network *** addition,this paper demonstrates the effectiveness of the proposed weight assignment strategy through the IEEE 14-bus ***,the differences in the estimation accuracy and the bad data identification between the robust interval state estimation and deterministic state estimation are discussed.

关键词： Interval state estimation interval analysis pseudo-measurement Gaussian process regression(GPR)

Energy dissipation mechanism of commensurate graphene layers

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Science China(Technological Sciences) 2021年第3期64卷 635-640页

作者： huo ZhanLei CHEN Yang GUO ZhengRong CHANG TienChong Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China

The energy dissipation mechanism of graphene layers in commensurate contact is studied by molecular dynamics *** commensurability between graphene layers is controlled by misfit angles between graphene layers or an in-plane strain applied to one of the graphene *** find that for small size graphene,the main energy dissipation is not caused by *** propose two potential energy dissipation channels,the lattice distortion induced by the moirésuperlattice structure and variation of entropy of the contacting *** results provide an insight into the energy dissipation mechanism of commensurate contact graphene.

关键词： graphene commensurate energy dissipation molecular dynamics misfit angle

Tailoring Morphology of PVDF-HFP Membrane via One-step Reactive Vapor Induced Phase Separation for Efficient Oil-Water Separation

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Chinese Journal of Polymer Science 2021年第5期39卷 610-619,I0007页

作者： Peng huo Cheng-Tang Zhong Xiao-Peng Xiong Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005China

Poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)receives increasing attention in membrane separation field based on its advantages such as high mechanical strength,thermal and chemical ***,controlling the microporous structure is still *** this work,we attempted to tailor the morphology of PVDF-HFP membrane via a one-step reactive vapor induced phase separation ***,PVDF-HFP was dissolved in a volatile solvent and then was cast in an ammonia water vapor *** complete evaporation of solvent,membranes with adjustable porous structure were prepared,and the microstructures of the membranes were analyzed by scanning electron microscopy,Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy and X-ray diffraction *** on the results,a mechanism of dehydrofluorination induced cross-linking of PVDF-HFP has been suggested to understand the morphology *** our knowledge,this is the first report of one-step reactive vapor induced phase separation strategy to tailor morphology of PVDF-HFP *** addition,the membranes prepared in the ammonia water vapor exhibited enhanced mechanical strength and achieved satisfactory separation efficiency for water-in-oil emulsions,suggesting promising potential.

关键词： PVDF-HFP Membrane Tailoring Vapor induced phase separation Oil-water separation

A Cross-Layer Cooperative Jamming Scheme for Social Internet of Things

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Tsinghua Science and Technology 2021年第4期26卷 523-535页

作者： Yan huo Jingjing Fan Yingkun Wen Ruinian Li School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China Department of Computer Science Bowling Green State UniversityBowling GreenOH 43403USA

In this paper,we design a friendly jammer selection scheme for the social Internet of Things(IoT).A typical social IoT is composed of a cellular network with underlaying Device-to-Device(D2D)*** our scheme,we consider signal characteristics over a physical layer and social attribute information of an application layer *** signal characteristics,one of the D2D gadgets is selected as a friendly jammer to improve the secrecy performance of a cellular *** return,the selected D2D gadget is allowed to reuse spectrum resources of the cellular *** social relationship,we analyze and quantify the social intimacy degree among the nodes in IoT to design an adaptive communication time *** an artificial intelligence forecasting model,we further forecast and update the intimacy degree,and then screen and filter potential devices to effectively reduce the detection and calculation ***,we propose an optimal scheme to integrate the virtual social relationship with actual communication *** select the optimal D2D gadget as a friendly jammer,we apply Kuhn-Munkres(KM)algorithm to solve the maximization problem of social intimacy and cooperative *** numerical results are presented to validate the performance of our scheme.

关键词： Internet of Things(IoT) artificial intel igence Device-to-Device(D2D)communications social network cooperative jamming

Electrochemical properties of MnO_(2)/CNT nanocomposite in neutral aqueous electrolyte as cathode material for asymmetric supercapacitors

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International Journal of Smart and Nano Materials 2011年第4期2卷 283-291页

作者： Hui Xia Chao huo School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjingJiangsu 210094P.R.China National Institute of Metrology China Bei San Huan Dong Road 18Beijing 100013P.R.China

A MnO_(2)/carbon nanotube(CNT)nanocomposite was synthesised using a simple hydrothermal *** nanocomposite exhibits a CNT core/MnO_(2)porous sheath hierarchy architecture,which makes it promising as an electrode material for *** asymmetric supercapacitor based on activated carbon(AC)as anode,MnO_(2)/CNT nanocomposite as cathode and 1M Na_(2)SO_(4)solution as electrolyte was assembled in a Swagelok *** full cell exhibits excellent power capability,cycling stability and a high energy density of 23 W h/kg at a power density of 330 W/kg based on the total mass of the active electrode *** AC//MnO_(2)/CNT asymmetric supercapacitor is promising for high-power applications due to its high energy density and power density.

关键词： supercapacitor carbon nanotube nanocomposite

Numerical study on effects of the cofferdam area in liquefied natural gas storage tank on the leakage and diffusion characteristics of natural gas

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Chinese Journal of Chemical Engineering 2021年第1期34卷 228-241页

作者： Zirong Lin Shuangfeng Wang Shuxun Fu Jiepeng huo Foshan Public Utilities Holding Co.Ltd. GuangdongFoshan 528000China South China University of Technology GuangdongGuangzhou 510640China Foshan gas group Co.Ltd. GuangdongFoshan 528000China Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangdongGuangzhou 510640China

The leakage and diffusion characteristics of natural gas were investigated in the condition of the leakage of liquefied natural gas(LNG) in the storage *** was adopted to simulate the process in a series of three-dimension unsteady state *** effects of different heights of the cofferdam(1.0 m, 2.0 m and 3.0 m),wind directions,ambient temperature,leakage location,leakage volume on the diffusion process of natural gas were *** diffusion characteristics of the natural gas clouds over cofferdam were *** windless condition,when the gas clouds met,the gas clouds rose due to the collision,which made them easier to cross the cofferdam and spread *** higher the ambient temperature was,the higher the gas concentration around the cofferdam was,and the smaller the gas concentration difference *** the leakage occurred,the higher coffe rdam was more beneficial to delay the outward diffusion of gas ***,when the leaka ge stopped,the higher cofferdam went against the dissipation of gas *** windy condition,the time to form stable leakage flow field was faster than that of windless,and the lower cofferdam further reduced this ***,considering the effect of barrier and dissipation,it was suggested that the rational height of cofferdam should be designed in the range of 1.0 m to 2.0 *** case of emergency,the leakage of gas should be deduced reasonably by combining the measurement of gas concentration with the rolling of gas *** windless,the leakage area should be entered between the overflows of gas clouds.

关键词： Natural gas Leakage and diffusion Cofferdam Numerical simulation

Filters for manufacturability in design optimization of variable stiffness composites

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Chinese Journal of Aeronautics 2021年第4期34卷 153-159页

作者： Ye TIAN Yuhang huo Tielin SHI Qi XIA State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024China

In the design optimization of variable stiffness composites,manufacturing constraints imposed by the automated fiber placement technology must be *** the present paper,two filters are proposed to address this issue,and they are incorporated into the Shepard interpolation-based design optimization framework developed in our previous *** fiber angle arrangement of a composite is represented by a continuous function that interpolates fiber angles at scattered design *** filters are appointed for each design point to deal with two typical manufacturing constraints,i.e.,fiber curvature and gap/*** each design point,the sensitivity is first filtered in a rectangular region around this point,and by this means the fiber curvature is controlled;then in another rectangular region around this design point,the filtered sensitivities are averaged,and the result is used to update the corresponding design *** numerical examples are investigated,and the results show that the proposed method is effective.

关键词： Composite laminates Design optimization Fiber angle Filter Manufacturing constraints