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Fluctuation of Quantum Information Density in Curved Time-Space

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Chinese Physics Letters 2007年第4期24卷 859-862页

作者： BI qiao Department of Physics Wuhan University of Technology Wuhan 430070 Center of Advanced Nanotechnology University of Toronto M5S 3E4 Canada

A dynamical equation for quantum information density （QID） in curved spacetime is presented. The related fluctuation of QID with quantum Einstein equation is also discussed, which reveals the measuring of the dynami... 详细信息

关键词： Cosmology

A visible-light-assisted Pd/TiO_(2)gas sensor with carbon nanotubes electrodes for trace formaldehyde detection

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Rare Metals 2024年第1期43卷 257-266页

作者： Can Liu qiao-qiao Zou Bin Liu Yong Zhang School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China Hunan Institute of Advanced Sensing and Information Technology Xiangtan UniversityXiangtan 411105China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China

Owing to the ppb-level detection standard toward the toxic and harmful gas,the detection of trace gases has become an important subject in the field of indoor environment ***,the traditional resistive gas sensors hardly meet the requirement due to the weak signal generated by trace gas molecules that are difficult to ***,a visible-light-assisted Pd/TiO_(2)gas sensor is proposed to endow the effective detection of trace formaldehyde(HCHO)gas without heating *** from the enhanced photocatalytic properties of TiO_(2)by Pd decoration,the visible-light-assisted Pd/TiO_(2)gas sensor can detect the HCHO gas as low as80×10^(–9)at room *** successful preparation of nanoscale TiO_(2)sensing layer is facilitated by the ultrathin carbon nanotube interdigital electrode in the gas sensor,which avoids the discontinuity of the sensing layer caused by the excessive thickness of the traditional metal *** addition,the whole preparation process of the Pd/TiO_(2)gas sensor with carbon nanotube electrodes is compatible with mainstream CMOS fabrication technology,which is expected to realize the batch fabrication and micro-integrated application of gas *** is expected that our work can provide a new strategy for the batch preparation of high-performance trace HCHO gas sensors and their future applications in portable electronic devices such as smartphones.

关键词： Visible-light-assisted gas sensor Pd/TiO_(2) Trace HCHO detection Carbon nanotubes electrodes

Structural engineering of high-entropy alloys for advanced electrocatalytic reactions

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Tungsten 2025年第1期 1-31页

作者： qiao Xie Ying-Jie Yu Hai-Jun Zhang Ya-Ping Deng Wen Lei The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Department of Chemical Engineering Waterloo Institute for Sustainable Energy Waterloo Institute for Nanotechnology University of Waterloo

High-entropy alloys(HEAs) have emerged as promising candidates to replace traditional precious metal catalysts,owing to their unique chemical and physical *** review commences by revisiting the fundamental concepts of HEAs,including their synthesis methods and structural control strategies in *** underscores the critical role of meticulously manipulating both macroscopic and microscopic structures of the HEAs to optimize their catalytic performance.A deep understanding of the structure-activity relationship in HEAs across various configurations is pivotal in developing more effective *** review methodically encapsulates the research progress of structural control strategies for HEAs in achieving efficient energy conversion,with the aim of gaining a better understanding of the relationship between structure and *** review concludes by summarizing the current achievements and challenges,and suggestions for potential future directions of HEAs in the fields of energy conversion and environmental purification.

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Recent advances in terpenoid syntheses from China

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Science China Chemistry 2016年第9期59卷 1142-1174页

作者： Tianjiao qiao Guangxin Liang State Key Laboratory and Institute of Elemento-organic Chemistry Nankai University Tianjin 300071 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300071 China

Total syntheses of terpenoids play an essential role in the development of synthetic organic chemistry and medicinal *** synthetic community has made more and more profound contribution to this field and has gradually grown into a major force in the world over the past years. In this review, we shall celebrate the achievement by surveying the recent terpenoid syntheses from China since 2010.

关键词： total synthesis natural product terpenoid dimer

Statics, vibration, and buckling of sandwich plates with metamaterial cores characterized by negative thermal expansion and negative Poisson's ratio

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Applied Mathematics and Mechanics(English Edition) 2023年第9期44卷 1457-1486页

作者： qiao ZHANG Yuxin SUN National Key Laboratory of Strength and Structural Integrity School of Aeronautic Science and EngineeringBeihang UniversityBeijing 100191China

This paper proposes a three-dimensional(3D)Maltese cross metamaterial with negative Poisson’s ratio(NPR)and negative thermal expansion(NTE)adopted as the core layers in sandwich plates,and aims to explore the relations between the mechanical responses of sandwich composites and the NPR or NTE of the ***,the NPR and NTE of the metamaterial are derived analytically based on energy *** effective elastic modulus and mass density of the 3D metamaterial are obtained and validated by the finite element method(FEM).Subsequently,the general governing equation of the 3D sandwich plate under thermal environments is established based on Hamilton’s principle with the consideration of the von Kármán *** differential quadrature(DQ)FEM(DQFEM)is utilized to obtain the numerical *** is shown that NPR and NTE can enhance the global stiffness of sandwich *** geometric parameters of the Maltese cross metamaterial significantly affect the responses of the thermal stress,natural frequency,and critical buckling load.

关键词： negative Poisson's ratio(NPR) negative thermal expansion(NTE) sand-wich plate vibration buckling

Strategies for enhancing conductivity of colloidal nanocrystals and their photoelectronic applications

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Journal of Energy Chemistry 2020年第9期29卷 29-42,I0002页

作者： Fen qiao Yi Xie School of Energy&Power Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070HubeiChina

Semiconductor colloidal nanocrystals(NCs)have size-and shape-dependent optoelectronic properties due to the quantum confinement effect,and are considered to be promising optoelectronic *** them,Ⅱ-Ⅵ(CdSe,CdS,CdTe,etc.)andⅣ-Ⅵ(PbSe,PbTe,PbS,etc.)have been widely studied as representative colloidal ***,the surfactant used in its synthesis progress results in the NCs surface covered by an insulating shell,which greatly affects the exciton separation and carrier transport of colloidal NCs-based photovoltaic ***,how to design high-efficiency optoelectronic devices by improving the transport performance of carriers has been a great *** key issues in the research ofⅡ-Ⅵ(CdSe,CdS,CdTe,etc.)andⅣ-Ⅵ(PbSe,PbTe,PbS,etc.)colloidal NCs were summarized,including synthesis strategy,morphology/size adjustment,surface ligand design,improvement of conductivity and their optoelectronic *** influence of surface ligands on the stability and dispersion of NCs was firstly introduced,and then strategies of improving electrical conductivity of NCs were discussed,such as ligands exchange,doping,self-assembly and plasmons,which provided a good foundation for the subsequent preparation of optoelectronic *** future development direction of NCs optoelectronic devices is expounded from the aspects of materials composition,comprehensive preparation and flexible processing of colloidal NCs.

关键词： Colloidal nanocrystal Surface engineering Conductivity Photoelectronic device

Hybrid Scenario Generation Method for Stochastic Virtual Bidding in Electricity Market

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CSEE Journal of Power and Energy Systems 2021年第6期7卷 1312-1321页

作者： Dongliang Xiao Wei qiao the School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China the Power and Energy Systems Laboratory Department of Electrical and Computer EngineeringUniversity of Nebraska-LincolnLincolnNE 68588-0511 USA

Stochastic optimization can be used to generate optimal bidding strategies for virtual bidders in which the uncertain electricity prices are represented by using *** paper proposes a hybrid scenario generation method for electricity price using a seasonal autoregressive integrated moving average(SARIMA)model and historical *** electricity price spikes are first identified by using an outlier detection ***,the historical data are decomposed into base and spike ***,the base and spike component scenarios are generated by using the SARIMA-and historical data-based methods,***,the electricity price scenarios are obtained by combining the base and spike component *** studies are carried out for a virtual bidder in the PJM electricity market to validate the proposed *** optimal bidding strategies of the virtual bidder are generated by solving a stochastic optimization problem using the electricity price scenarios generated by the proposed method,the SARIMA method,and a historical data-based method,*** study results show that the proposed method is better than the SARIMA method in preserving statistical properties of the electricity price in the generated scenarios and is better than the historical data-based method in predicting the future trend of the electricity price and,therefore,can help the virtual bidder earn more profit in the electricity market.

关键词： Electricity market electricity price scenario generation stochastic optimization virtual bidding

Modeling of Energy Consumption and Effluent Quality Using Density Peaks-based Adaptive Fuzzy Neural Network

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IEEE/CAA Journal of Automatica Sinica 2018年第5期5卷 968-976页

作者： Junfei qiao Hongbiao Zhou beijing university of technology and beijing key laboratory of computational intelligence and intelligent system Beijing l00l24，China

Modeling of energy consumption(EC) and effluent quality(EQ) are very essential problems that need to be solved for the multiobjective optimal control in the wastewater treatment process(WWTP). To address this issue, a density peaks-based adaptive fuzzy neural network(DP-AFNN) is proposed in this study. To obtain suitable fuzzy rules, a DP-based clustering method is applied to fit the cluster centers to process *** parameters of the extracted fuzzy rules are fine-tuned based on the improved Levenberg-Marquardt algorithm during the training process. Furthermore, the analysis of convergence is performed to guarantee the successful application of the DPAFNN. Finally, the proposed DP-AFNN is utilized to develop the models of EC and EQ in the WWTP. The experimental results show that the proposed DP-AFNN can achieve fast convergence speed and high prediction accuracy in comparison with some existing methods.

关键词： Density peaks clustering effluent quality (EQ) energy consumption (EC) fuzzy neural network improved Levenberg-Marquardt algorithm wastewater treatment process (WWTP).

Data-Driven Direct Adaptive Risk-Sensitive Control of Stochastic Systems

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Journal of Systems Science & Complexity 2024年第4期37卷 1446-1469页

作者： qiao Nan LI Tao School of Mathematical Sciences East China Normal UniversityShanghai 200241China Shanghai Key Laboratory of Pure Mathematics and Mathematical Practice School of Mathematical SciencesEast China Normal UniversityShanghai 200241China

The authors propose a data-driven direct adaptive control law based on the adaptive dynamic programming(ADP) algorithm for continuous-time stochastic linear systems with partially unknown system dynamics and infinite horizon quadratic risk-sensitive *** authors use online data of the system to iteratively solve the generalized algebraic Riccati equation(GARE) and to learn the optimal control law *** the case with measurable system noises,the authors show that the adaptive control law approximates the optimal control law as time goes *** the case with unmeasurable system noises,the authors use the least-square solution calculated only from the measurable data instead of the real solution of the regression equation to iteratively solve the *** authors also study the influences of the intensity of the system noises,the intensity of the exploration noises,the initial iterative matrix,and the sampling period on the convergence of the ADP ***,the authors present two numerical simulation examples to demonstrate the effectiveness of the proposed algorithms.

关键词： Adaptive dynamic programming direct adaptive control generalized algebraic Riccati equation risk-sensitive control