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Value Assessment of Airport Billboards Based on Passenger Big Data

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Journal of Systems Science and Systems Engineering 2022年第3期31卷 381-392页

作者： Jianliang mu Xinyue Cai Yongbo xiao School of Economics and Management Beihang UniversityBeijing 100191China Research Center for Contemporary Management School of Economics and ManagementTsinghua UniversityBeijing 100084China

As an important element of the airport ecosystem,airport billboards are playing a crucial role in publicizing the city image and facilitating humanistic airport *** the same time,airport billboards have great commercial value and is a popular channel for enterprises to prompt their products and to build their brand ***,most airports in China adopt a simple fixed pricing mechanism for airport ***,for any type of billboard,the advertising price is mainly determined by considering historical prices and the total passenger flow of the entire airport during a whole ***,this seemingly crude pricing mechanism only considers macro-level data of passenger flow and fails in reflecting the real value of billboards in different locations effectively,since the value of a particular billboard depends not only on its media form,but also on the number of passengers flowing through and whether these passengers are the target customers of the advertising *** on big data on airport layout,flight information,and passenger attributes,this paper proposes a time-and location-based value assessment model for airport *** sample data collected from the Beijing Capital International Airport,the assessment model is adopted to evaluate the value of two real billboards in Terminal *** of this model can reflect the difference in the value of airport billboards located in different spots during various ***,this model provides a solid foundation for airport executives to develop differentiated/dynamic pricing and flexible advertisement scheduling strategies,thereby improving the overall efficiency.

关键词： Airport billboards value assessment passenger big data passenger portrait advertisement pricing

Advances in bio-inspired electrocatalysts for clean energy future

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Nano Research 2024年第2期17卷 515-533页

作者： Jing-Wen Duan mu Min-rui Gao Division of Nanomaterials&Chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleDepartment of ChemistryUniversity of Science and Technology of ChinaHefei 230026China

Electrocatalysis can enable efficient energy storage and conversion and thus is an effective way to achieve carbon *** unique structure and function of organisms can offer many ideas for the design of electrocatalysts,which has become one of the most promising research ***,the understanding of the mechanism of bio-inspired electrocatalysis has become clearer,which has promoted the design of bio-inspired catalysts and catalytic *** bio-inspired catalysts(enzyme-like catalysts,layered porous catalysts,superhydrophobic/superhydrophilic surfaces,and so on)have been developed to enable efficient electrocatalytic ***,we discuss the key advances in the field of bio-inspired electrocatalysts progressed in recent ***,the role of bio-inspiration in increasing the intrinsic activity and number of active sites of catalysts is ***,the structure and mechanism of layered porous catalytic systems that mimic biological transport systems are comprehensively ***,the design of three-phase interfaces from micro-nanoscale to atomic scale is highlighted,including the wettability of the electrode surface and the transport system near the *** conclude the review by identifying challenges in bio-inspired electrocatalysts and providing insights into future prospects for the exciting research field.

关键词： bio-inspired electrocatalysts active sites layered porous structure three-phase interface

A mathematical model capable of describing the liquid flow mainly in a blast furnace

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International Journal of Minerals,Metallurgy and Materials 2009年第5期16卷 505-511页

作者： Cheng-shan Wang xiao-jing mu College of Materials Science and Engineering Chongqing University Chongqing 400045 China College of Chemistry and Chemical Engineering Chongqing University Chongqing 400045 China

The molten liquid flow inside a packed bed is a familiar momentum transportation phenomenon in a blast furnace. With regard to the reported mathematical models describing the liquid flow within a packed bed, there are some obstacles for their application in engineering design, or some limitations in the model itself. To overcome these problems, the forces from the packed bed to the liquid flow were divided into appropriate body and surface forces on the basis of three assumptions. Consequently, a new mathematical model was built to present the liquid flow inside the coke bed in a blast furnace. The mathematical model can predict the distribution of liquid flowrate and the liquid flowing range inside the packed bed at any time. The predicted results of this model accord well with the experimental data. The model will be applied considerably better in the simulation on the ironmaking process compared with the existent models.

关键词： ironmaking process blast furnace packed bed discrete flow mathematical model

REAL-TIME FLOOD FORECASTING METHOD WITH 1-D UNSTEADY FLOW MODEL

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Journal of Hydrodynamics 2007年第2期19卷 150-154页

作者： mu Jin-bin ZHANG xiao-feng State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan 430072China

A real-time forecasting method coupled with the I-D unsteady flow model with the recursive least-square method was developed. The 1-D unsteady flow model was modified by using the time-variant parameter and revising it dynamically through introducing a variable weighted forgetting factor, such that the output of the model could be adjusted for the real time forecasting of floods. The application of the new real time forecasting model in the reach from Yichang to Luoshan of the Yangtze River was demonstrated. Computational result shows that the forecasting accuracy of the new model is much higher than that of the original 1-D unsteady flow model. The method developed is effective for flood forecasting, and can be used for practical operation in the flood forecasting.

关键词： unsteady flow hydraulic model least squares,time variant forgetting factor real-time forecasting

Temperature-insensitive micro-displacement sensor with spindle-shaped structure single mode fiber

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Optoelectronics Letters 2025年

作者： ZHANG Weihua mu Jinlin WANG Hao WANG Dong YU Haozheng TAO Yipeng Engineering Research Center of Optoelectronic Devices and Communication Technology，Ministry of Education， Tianjin Key Laboratory of Film Electronic and Communication Devices， School of Integrated Circuit Science and Engineering， Tianjin University of Technology Engineering Infrastructure Department，Autonomous Driving Department xiaomi EV Company Ltd

A temperature-insensitive micro-displacement sensor based on a spindle-shaped single mode fiber (SMF) is presented and demonstrated. The SMF is bent into a balloon-shaped SMF and burned into a spindle-shaped SMF by a flame. Due to the bending of the fiber， part of the incident light leaks from the fiber core into the fiber cladding， which excites higher order cladding modes. Therefore， modal interference occurs. The experimental results show that the maximum sensitivity of the sensors is -203 pm/μm when micro-displacement varies from 0 to 80 μm. The sensors are insensitive to temperature in the range of 20-70℃. In addition， the sensors have the advantages of simple structure， low cost， small volume， high sensitivity and stability， which can be widely used in numerous high-precision industrial measurements and civil engineering structure monitoring fields.

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Dynamic event-triggered bipartite consensus for uncertain high-order nonlinearmulti-agentsystems

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Control Theory and Technology 2023年第2期21卷 222-232页

作者： Yanan Qi Chunshui Du Xianfu Zhang rui mu School of Control Science and Engineering Shandong UniversityJinan 250061ShandongChina

In this paper,the bipartite consensus problem is studied for a class of uncertain high-order nonlinear multi-agent systems.A signed digraph is presented to describe the collaborative and competitive interactions among *** each agent with lower triangular structure,a time-varying gain compensator is first designed by relative output information of neighboring ***,a distributed controller with dynamic event-triggered mechanism is proposed to drive the bipartite consensus error to *** is worth noting that an internal dynamic variable is introduced in triggering function,which plays an essential role in excluding the Zeno behavior and reducing energy ***,the dynamic event-triggered control protocol is developed for upper triangular multi-agent systems to realize the bipartite consensus without Zeno ***,simulation examples are provided to illustrate the effectiveness of the presented results.

关键词： High-order nonlinear multi-agent systems Uncertain systems Dynamic event-triggered control Bipartite consensus

Improvements on the upper-ocean simulation from 2007 to 2018 in the Canada Basin

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Advances in Climate Change Research 2022年第2期13卷 196-204页

作者： Long-Jiang mu xiao-Yu WANG Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China Frontier Science Center for Deep Ocean multispheres and Earth System(FDOMES) Physical Oceanography LaboratoryOcean University of ChinaQingdao 266100China

The Beaufort Gyre reserves most of the freshwater in the Arctic *** shows that the freshwater content over 2016-2018 far exceeds the level over the plateau period *** the vertical temperature and salinity structure and their changes in the Beaufort Gyre is a way to understand the process related to such step *** configured a pan-Arctic sea ice-ocean model with a southern boundary at∼7°N in the Atlantic *** numerical simulation with sea surface salinity restoring,a latitude dependent horizontal diffusivity scaled by the squared buoyancy frequency,and a weak vertical diffusivity of 5×10^(−7) m^(2)s^(−1) in the Arctic Ocean better reproduces the sea ice extent,the Pacific summer halocline water,and the freshwater variations as *** sea surface salinity restoring mitigates the surface desalination in the North Atlantic Ocean,therefore a weaker ocean stratification prevents the excessive warming in the intermediate Arctic *** is also found that the weak vertical background diffusivity is the major factor in our model to preserve the vertical ocean structure in the Canada Basin and also the step change of freshwater *** addition to resolving eddy activities in high resolution models,the success in our low resolution model suggests that tuning the vertical diffusivity serves as another approach to simulate the increasing freshwater content in the recent decade.

关键词： Beaufort Gyre Numerical simulation Upper Arctic Ocean Freshwater content

Secure Channel Free ID-Based Searchable Encryption for Peer-to-Peer Group

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Journal of Computer Science & Technology 2016年第5期31卷 1012-1027页

作者： xiao-Fen Wang Yi mu Rongmao Chen xiao-Song Zhang College of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu 611731 China Big Data Research Center University of Electronic Science and Technology of China Chengdu 611731 China School of Computing and Information Technology University of Wollongong Wollongong NSW 2500 Australia College of Computer National University of Defense Technology Changsha 410073 China

Data sharing and searching are important functionalities in cloud storage. In this paper, we show how to securely and flexibly search and share cloud data among a group of users without a group manager. We formalize a novel cryptosystem： secure channel free searchable encryption in a peer-to-peer group, which features with the secure cloud data sharing and searching for group members in an identity-based setting. Our scheme allows group members to join or leave the group dynamically. We present two schemes： basic scheme and enhanced scheme. We formally prove that our basic scheme achieves consistency and indistinguishability against the chosen keyword and ciphertext attack and the outsider＇s keyword guessing attack, respectively. An enhanced scheme is also proposed to achieve forward secrecy, which allows to revoke user search right over the former shared data.

关键词： searchable encryption forward secrecy data sharing peer-to-peer group

Synthesis and Characterization of Two [2]Catenanes Based on Phenylene-diacetylene Crown Ethers

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Chemical Research in Chinese Universities 2013年第6期29卷 1094-1097页

作者： CHEN mu-juan ZHOU Song-gen LI Mei LEI Chun-yan xiao rui JIANG La-sheng School of Chemistry and Environment South China Normal University Guangzhou 510006 P.R.China

Two charged donor-acceptor [2]catenanes were synthesized by the cyclization of the π-acceptor 1,1 ＇-[1, 4-phenylenebis-（methylene）]bis（4,4＇-bipyridinium）bis（hexafluorophosphate）（2） and bis（bromomethyl）benzene with the templates of the π-donor phenylene-diacetylene crown ethers la and lb in the yields of 31%, 35%, respectively. The mass spectra, 1H and 13C NMR spectra confirm that the phenylene-diacetylene crown ethers, with a nonaromatic ~r-system, successfully template the cyclization of CBPQT4＋. The X-ray crystallography analysis shows that the CBPQT4＋ ring encircles around the phenylene motif of the crown ethers, leaving the 1,3-butadiyne fragment out of the cavity of CBPQT4＋ ring. The mechanically interlocked structure of [2]catenanes was stabilized by the cooperative effects of π-stacking and hydrogen bonding interactions.

关键词： Catenane Crystal structure Crown ether