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Joint Stochastic Computation Offloading and Trajectory Optimization for Unmanned-Aerial-Vehicle-Assisted Mobile Edge Computing

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IEEE ACCESS 2025年 13卷 2034-2044页

作者： zhou, yi Chongqing Univ Coll Comp Sci Chongqing 400044 Peoples R China

In Mobile Edge Computing (MEC), Unmanned Aerial Vehicles (UAVs) equipped with communication and computation capabilities can be used as an edge node, which can not only satisfy the user's demand for high computation power and low latency, but also extend the range of computation services and enhance the mission quality in environments with limited communication facilities. In this study, we investigate a UAV-assisted MEC system with stochastic computing tasks. The system seeks to minimize overall energy consumption by optimizing computation offloading, resource allocation, and the UAV's trajectory scheduling. This objective corresponds to a stochastic optimization problem. Given the problem's non-convex nature and the temporal coupling of variables, the Lyapunov optimization method is employed to analyze the task queue, breaking down the original optimization problem into three independent and more manageable subproblems. A joint optimization algorithm with iterative solving is proposed for solving the three sub-problems and then obtaining the stochastic computation offloading, resource allocation, and trajectory scheduling strategy. The simulation results show that the proposed strategy is able to achieve an effective compromise between the system's energy consumption and queue stability by adjusting the Lyapunov parameters, and significantly reduce energy consumption compared to the baseline strategies.

关键词： Mobile edge computing unmanned aerial vehicle computation offloading computation offloading resource allocation resource allocation trajectory scheduling trajectory scheduling trajectory scheduling

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Green innovation unleashed:Harnessing tungsten-based nanomaterials for catalyzing solar-driven carbon dioxide conversion

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Chinese Chemical Letters 2025年第2期36卷 108-117页

作者： Weidan Meng Yanbo zhou yi zhou State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and TechnologyShanghai 200237China National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery East China University of Science and TechnologyShanghai 200237China Shanghai Engineering Research Center for Multi-media Environmental Catalysis and Resource Utilization East China University of Science and TechnologyShanghai 200237China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Carbon dioxide photocatalytic reduction (CO_(2)-PR) is an efficient method for controlling CO_(2)emissions and generating cleaner energy while mitigating global *** oxides (WxOy) have attracted considerable attention for CO_(2)-PR due to their excellent spectral ***,comprehensive reviews are lacking on the use of WxOyfor CO_(2)-***,this review provides a detailed summary of t research progress made with WxOy-based catalysts in CO_(2)-*** also explains the fundamental principles of CO_(2)-PR and evaluates key performance indicators that affect the activity of WxOy-based photocatalysts,including yield,selectivity,stability,and apparent quantum ***,this review explores opportunities for synthesizing high-performance WxOy-based photocatalysts and highlights their potential for the green preparation of C1/C2 products through CO_(2)-*** innovative strategies aim to address the challenges and pressures associated with energy and environmental issues,particularly by enhancing artificial photosynthesis efficiency.

关键词： Carbon dioxide photoreduction Tungsten-based nanocatalyst Mechanism Performance evaluation Selectivity

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Risk assessment method of human resources outsourcing based on risk matrix

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International Journal of Manufacturing Technology and Management 2025年第1-2期39卷 44-58页

作者： zhou, yi Business College Hunan International Economics University Changsha410205 China

In order to reduce the error of risk assessment and improve the correlation of risk indicators, a risk assessment method of human resource outsourcing based on the risk matrix method is proposed. First, determine the risk indicators of human resource outsourcing, use the rough set theory to determine the indiscernibility of the evaluation indicators, and use F-score to calculate the risk evaluation indicators and their information gain. Then, build a risk matrix coordinate chart to identify outsourcing risk factors, calculate the probability of outsourcing risk occurrence using the conditional random field joint probability formula, and build a risk assessment model through the risk matrix method to complete the risk assessment. The experimental results show that the evaluation error of the proposed method is always less than 2%, and the maximum correlation coefficient is close to 1, which verifies the effectiveness of the method. Copyright © 2025 Inderscience Enterprises Ltd.

关键词： f-score human resources information gain joint probability of conditional random fields outsourcing risk risk matrix method

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Molecular dynamics simulation study of interface stability of spiral magnetic fluid seals of cone bit

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INDUSTRIAL LUBRICATION AND TRIBOLOGY 2025年

作者： zhou, yi Song, Wenchao zhou, yi Chen, yifan Zhang, Zhichao Southwest Petr Univ Chengdu Peoples R China

PurposeThe purpose of this paper is to investigate the interfacial stability between the magnetic fluid and the grease during the drilling process of a spiral magnetic fluid seal in a tooth wheel drill ***/methodology/approachIn this study, the actual working conditions of a tooth wheel drill bit in downhole operation are simulated by means of molecular dynamics, so as to observe the microscopic state of the interface between the magnetic fluid and the grease of the tooth wheel drill bit helical magnetic fluid seal during the actual *** the molecular dynamics simulation carried out under five working conditions, respectively, it can be obtained that with the increase of temperature and pressure, the magnetic particles diffuse more and more slowly in the system, and the interaction force between the magnetic particles and the grease molecules becomes weaker and weaker. And there is only a slight fusion of the interface between the magnetic fluid and the grease, and the overall performance of the magnetic fluid is not affected by the ***/valueIn this study, to the best of the authors' knowledge, the spiral magnetic fluid sealing structure of a tooth wheel drill bit is proposed for the first time, which is highly innovative. And the study of using molecular dynamics to simulate the interfacial stability between the magnetic fluid and grease analyzes the feasibility of the spiral magnetic fluid sealing structure of the tooth wheel drill *** reviewThe peer review history for this article is available at: https://***/publon/10.1108/ILT-03-2024-0065/

关键词： Cone bit Helical magnetic fluid seal Interface stability Molecular dynamics simulation

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Synergistic effect of π-π and p-π conjugation of a commercial amine for enhanced photocatalytic CO2 cycloaddition reaction

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APPLIED CATALYSIS A-GENERAL 2025年 698卷

作者： zhou, yi Zhao, Wenfeng Guizhou Univ Sch Chem & Chem Engn Guiyang 550025 Peoples R China

Designing a low-cost and efficient photocatalytic system to produce high-valuable carbonates from the cycloaddition of CO2 by using clean and renewable sunlight as the driving force shows great research potential. Here, a commercially available 4,4''-diamino-p-terphenyl (DT) was directly employed to promote the photocatalytic cycloaddition of CO2 and various epoxides under visible light irradiation. As high as 95 % yield of target carbonate was obtained using blue LED (>450 nm) as a light source for 6 h under solvent-free/atmospheric CO2/ room temperature conditions. Even under irradiation of natural light, a good yield of 68 % carbonate can also be achieved under ambient conditions. Moreover, in situ EPR and a series of controlled experiments were conducted to investigate the plausible photocatalytic mechanism, demonstrating that amino-containing DT with both pi-pi and p-pi conjugated structure provides abundant basic sites and photogenerated electrons/holes as active sites for CO2 activation and ring opening of epoxides at the same time.

关键词： Commercial photocatalyst pi-pi and p-pi conjugation Reaction mechanism CO2 cycloaddition

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Stability and Rheological Properties of Grouts with Waste Glass Powder as Cement Replacement: Influences of Content and Alkali Activator

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MATERIALS 2025年第2期18卷 353-353页

作者： Li, Liuxi Deng, Chao zhou, yi Tan, Qundong Yan, Wenqin zhou, Dequan zhou, yi Changsha Univ Sci & Technol Coll Civil Engn Changsha 410114 Peoples R China Hunan City Univ Hunan Engn Res Ctr Struct Safety & Disaster Preven Yiyang 413000 Peoples R China Hunan City Univ Coll Civil Engn Yiyang 413000 Peoples R China Cent South Univ Sch Geosci & Infophys Changsha 410083 Peoples R China

Effective recycling and utilization of waste glass is a critical issue that urgently needs to be addressed. This study aims to explore the feasibility of using ground waste glass powder (particle size <= 75 mu m) as a supplementary cementitious material to partially replace cement in the preparation of low-carbon and environmentally friendly grouting materials. The research systematically evaluates the impact of waste glass powder (WGP) on the fresh properties (particularly the stability and rheological characteristics) of cement-based grouting materials under various conditions, including WGP content (0-40%), the addition of NaOH activator (Na2O content of 4%) or not, and water-solid ratio (w/s = 0.5, 0.65, 0.8, 1.0). The results indicate that, in the absence of activator, the addition of WGP generally increases the amount of free liquid exudation in the grout, reducing its stability;however, under low w/s ratios, appropriate amounts of WGP can enhance stability. When the w/s ratio is high and the WGP content is large, the grout stability decreases significantly. The addition of NaOH activator (Na2O content of 4%) significantly reduces free liquid exudation, enhancing the stability of the grout, especially when the w/s ratio is less than 1.0. Furthermore, the Herschel-Bulkley Model was experimentally validated to accurately describe the rheological behavior of waste glass-cement slurries, with all R2 values exceeding 0.99. WGP and alkaline activator have significant effects on the rheological properties of the grout. Although they do not change its flow pattern, they significantly affect shear stress and viscosity. The viscosity of the slurry is influenced by the combined effects of w/s ratio, WGP content, and alkaline activator, with complex interactions among the three. The application of these research findings in the field of grouting engineering not only contributes to significantly reducing glass waste but also promotes the production of sustainable cement-ba

关键词： sustainable construction materials glass waste valorization cementitious replacement alkaline activation grouting properties

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Nitrogen-doped iron carbide composites for activating peroxymonosulfate to degrade sulfonamides

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SEPARATION AND PURIFICATION TECHNOLOGY 2025年 358卷

作者： Lu, Qinwei Lu, Jian zhou, yi zhou, Yanbo East China Univ Sci & Technol State Environm Protect Key Lab Environm Risk Asses Shanghai 200237 Peoples R China Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resource Reuse Key Lab Yangtze Water Environm Shanghai 200092 Peoples R China Jinggangshan Univ Sch Life Sci Jian 343009 Peoples R China State Key Lab Coal Liquificat Gasificat & Utilizat Shanghai 200237 Peoples R China

Advanced oxidation technology based on persulfate can efficiently remove trace pollutants in water, but there are problems with poor electronic cycling efficiency and metal leaching. In this work, we successfully fabricated in-situ nitrogen doped biochar composite material Fe3C/C by chelating Fe2+ ions with chitosan and carbonizing the precursor. The main active component of Fe3C/C was Fe3C, and nitrogen doping and biochar structure promoted the cycling of Fe2+/Fe3+. The catalyst Fe3C/C exhibits excellent synergistic "adsorption-oxidation" ability, and the removal efficiency of sulfonamide (SA) can reach 80 % (k = 0.1793 min-1). The degradation kinetics, free radical chemistry, and characterization were combined to investigate the synergistic effect of Fe3C and carbon substrate on the generation of persistent free radicals. Fe3C/C is not only an electron donor, but also an electron acceptor and electron transfer carrier. In the Fe3C/C/PMS system, free radical and non-free radical pathways coexist, which makes it suitable for the treatment of various pollutants in complex water matrices. The contribution of defects and pyrrole nitrogen constitutes the synergistic degradation process of free and non-free radicals. In addition, Fe3C/C-3 showed good continuous processing ability and less iron dissolution in the packed column experiment. This work provides theoretical support and technical means for the efficient removal of trace pollutants in water by biochar-based advanced oxidation technology.

关键词： Derived carbon Advanced oxidation Nitrogen doping Metal dissolution Electron shuttle

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Regularity of the free boundary for a semilinear vector-valued minimization problem ☆

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JOURNAL OF DIFFERENTIAL EQUATIONS 2025年 430卷

作者： Du, Lili zhou, yi Shenzhen Univ Coll Math & Stat Shenzhen 518061 Peoples R China Sichuan Univ Dept Math Chengdu 610064 Peoples R China

In this paper, we consider the following vector-valued minimization problem min{integral(D)(|del u|(2) +F(|u|))dx : u is an element of W-1,W-2(D;Rm) and u = g on partial derivative D } where u : D-* R-m (m >= 1) is a vector-valued function, D subset of R-n (n >= 2) is abounded Lipschitz domain, g is an element of W-1,W-2(D;R-m) is a given vector-valued function and F: [0, oc)-* R is a given function. This minimization problem corresponds to the following semilinear elliptic system Delta u= 1/ 2 F '(|u|) u /chi{|u|>0}, |u| where chi(A) denotes the characteristic function of the set A. The linear case that F '- 2 was studied in the previous elegant work by Andersson et al. (2015) [3], in which an epiperimetric inequality played a crucial role to indicate an energy decay estimate and the uniqueness of blow-up limit. However, this epiperimetric inequality cannot be directly applied to our case due to the more general non-degenerate and non-homogeneous term F which leads to Weiss's energy functional does not have scaling properties. Motivated by the linear case, when F satisfies some assumptions, we establish successfully a new epiperimetric inequality, it can deal with term which is not scaling invariant in Weiss's energy functional. As an application of this new epiperimetric inequality, we conclude that the free boundary D boolean AND partial derivative{|u| > 0} is a locally C-1,C-beta surface near the regular points for some beta is an element of (0, 1). (c) 2025 Published by Elsevier Inc.

关键词： Free boundary Vector-valued problem Elliptic system Regularity Obstacle problem

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Biochars from Cotton Seed, Camelia Seed Shell, and Coffee Ground in Modification of Asphalt: Fundamental Properties, Rheological Performance, and Inhibition of VOC Emissions

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MATERIALS 2025年第7期18卷 1504-1504页

作者： Zhang, Xiao zhou, yi Xue, Yongjie Wuhan Univ Technol State Key Lab Silicate Mat Architectures Wuhan 430070 Peoples R China

With the increasing requirement for asphalt modification, a new environmentally friendly asphalt modifier is needed. In this study, three varieties of biomass, cotton seed (CO), camelia seed shell (CA), and coffee ground (CG), were chosen for biochar preparation and asphalt modification to find an environmentally friendly asphalt modifier. A segregation test was applied to evaluate the storage stability of the modified asphalt. A dynamic shear rheometer (DSR) temperature sweep and frequency sweep were used to characterize the high-temperature performance. The low-temperature performance was evaluated by the bending beam rheometer (BBR) test. The DSR results indicate that the rutting factor increase for modified asphalt at high temperatures is CO approximate to CG > CA, and a high temperature could reflect the biochar's properties better in modified asphalt. Furthermore, the low-temperature deterioration is well controlled in CO and CA biochar-modified asphalt. Finally, the volatile organic compound (VOC) emission behavior was evaluated using gas chromatography-mass spectrometry (GC-MS).

关键词： asphalt modification biochar rheology

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A Site-Specific Photo-Crosslinking Proteomics Approach Provides Insights into Noncanonical Pyroptotic Caspase-4 Substrates

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ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 2025年第0期 e202501535页

作者： zhou, yi Zhang, Xinyu yin, Hang Tsinghua Univ Sch Pharmaceut Sci Key Lab Bioorgan Phosphorous Chem & Chem Biol Dept ChemTsinghua Peking Ctr Life Sci Beijing 100084 Peoples R China

Inflammatory caspases (1/4/5) are key effectors in the process of pyroptosis by cleaving and activating the pore-forming protein gasdermin D (GSDMD). Unlike other caspases whose substrates have been well characterized, the substrates for caspase-4, which mediate noncanonical pyroptosis, remain poorly understood. Here, we combined noncanonical amino acids, photo-crosslinking, and proteomics to profile caspase-4 substrates, enabling the capture of transient protein interactions with activated caspase-4. A set of new substrates were identified by photo-crosslinking mass spectrometry, revealing the signaling pathway and biological process affected by pyroptosis. Notably, we found that AKT1 is cleaved at D108, which removes its autoinhibition and membrane localization domain, resulting in the release of activated AKT1. Our results also showed the precursor of caspase-5/12 could be cleaved by caspase-4 to form the p20/p10 active conformation, uncovering a previously unrecognized pyroptotic caspase cascade. Overall, this study presents an approach for identifying caspase-4 substrates and offers further understanding of noncanonical pyroptosis.

关键词： Caspase-4 Substrates Profiling Genetic Code Expansion Photo-crosslinking Proteomics Pyroptosis

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