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Hybrid energy harvesting systems for self-powered sustainable water purification by harnessing ambient energy

Frontiers of Environmental Science & engineering 2023年第10期17卷 1-16页

作者： Zhengyang Huo Young Jun Kim Yuying Chen Tianyang Song Yang Yang Qingbin Yuan Sang Woo Kim School of Environment and Natural Resources Renmin University of ChinaBeijing 100872China School of Advanced Materials Science and Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Institute of Scientific and Technical Information of China Beijing 100038China

The development of self-powered water purification technologies for decentralized applications is crucial for ensuring the provision of drinking water in resource-limited regions. The elimination of the dependence on external energy inputs and the attainment of self-powered status significantly expands the applicability of the treatment system in real-world scenarios. Hybrid energy harvesters, which convert multiple ambient energies simultaneously, show the potential to drive self-powered water purification facilities under fluctuating actual conditions. Here, we propose recent advancements in hybrid energy systems that simultaneously harvest various ambient energies (e.g., photo irradiation, flow kinetic, thermal, and vibration) to drive water purification processes. The mechanisms of various energy harvesters and point-of-use water purification treatments are first outlined. Then we summarize the hybrid energy harvesters that can drive water purification treatment. These hybrid energy harvesters are based on the mechanisms of mechanical and photovoltaic, mechanical and thermal, and thermal and photovoltaic effects. This review provides a comprehensive understanding of the potential for advancing beyond the current state-of-the-art of hybrid energy harvester-driven water treatment processes. Future endeavors should focus on improving catalyst efficiency and developing sustainable hybrid energy harvesters to drive self-powered treatments under unstable conditions (e.g., fluctuating temperatures and humidity).

关键词： Piezocatalysis Solar energy Waste heat Decentralized water treatment Point-of-use Nanogenerator

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Catalyst-modified perovskite hollow fiber membrane for oxidative coupling of methane

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Chinese Journal of Chemical engineering 2022年第1期35卷 412-419页

作者： Jian Song Claudia Li Shao Zhang Xiuxia Meng Bo Meng Jaka Sunarso Department of Chemical Engineering Shandong University of TechnologyZibo 255049China State Key Laboratory of Separation Membranes and Membrane Processes Department of Chemical EngineeringTiangong UniversityTianjin 300387China Research Centre for Sustainable Technologies Faculty of EngineeringComputing and ScienceSwinburne University of TechnologyJalan Simpang Tiga93350 KuchingSarawakMalaysia

The catalytic oxidative cou pling of methane(OCM)to C_(2) hydrocarbons(C_(2)H_(6) and C_(2)H_(4))represents one of the most effective ways to convert natural gas to more useful products,which can be performed effectively using La_(0.6)Sr0.4Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)perovskite hollow fiber membrane *** this work,the effects of adding a thin BaCe_(0.8)Gd_(0.2)O_(3-δ)(BCG)catalyst film onto the inner LSCF fiber surface as the OCM catalyst and a porous Ba0.5Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)(BSCF)perovskite layer onto the outer LSCF surface to improve the oxygen permeation were *** 700℃and 1000℃,methane conversion increased in the order of uncoated,BCG and BSCF-coated,and BCG-coated LSCF hollow fiber while Coselectivity and C_(2)-yield increased in the order of BCG and BSCF-coated,uncoated,and BCG-coated LSCF hollow *** permeation flux at the same temperature range,on the other hand,was enhanced in the order of uncoated,BCG-coated,and BCG and BSCF-coated LSCF hollow *** finding demonstrates the complex interplay between oxygen permeation and OCM *** BCG and BSCFcoated hollow fiber was also subjected to thermal cycles between 850℃and 900℃for up to 175 hours during which the fiber showed minor degradation in oxygen permeation fluxes and relatively stable OCM performance.

关键词： Hollow fiber Membrane reactor Oxidative coupling of methane(OCM) Perovskite

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Binary Network Protocol Segmentation Based on Probabilistic Inference

SSRN

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SSRN 2023年

作者： Guo, Maohua Fei, Jinlong Zhu, Yuefei State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450000 China

Protocol Reverse engineering (PRE) is of great practical importance in Internet security-related fields such as intrusion detection, vulnerability mining, and protocol fuzzing. For unknown binary protocols having fixed-length fields, and the accurate identification of field boundaries has a great impact on the subsequent analysis and final performance. Hence, this paper proposes a new protocol segmentation method based on Information-theoretic statistical analysis for binary protocols by formulating the field segmentation of unsupervised binary protocols as a probabilistic inference problem and modeling its uncertainty. Specifically, we design four related constructions between entropy changes and protocol field segmentation, introduce random variables, and construct joint probability distributions with traffic sample observations. Probabilistic inference is then performed to identify the possible protocol segmentation points. Extensive trials on nine common public and industrial control protocols show that the proposed method yields higher-quality protocol segmentation results. © 2023, The Authors. All rights reserved.

关键词： Intrusion detection

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Numerical analysis method of ship-ice collision-induced vibration of the polar transport vessel based on the full coupling of ship-ice-water-air

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Journal of Ocean engineering and Science 2023年第4期8卷 323-335页

作者： Yuan-He Shi De-Qing Yang Wen-Wei Wu State Key Laboratory of Ocean Engineering School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-sea Exploration Shanghai Jiao Tong UniversityShanghai 200240China SJTU Yazhou Bay Institute of Deepsea Science and Technology Sanya 572024China National Key Laboratory on Ship Vibration&Noise China Ship Scientific Research CenterWuxi 214082China

As the Arctic Channel continues to be developed,collisions between polar navigation vessels and sea ice are inevitable,which will directly affect structural safety and vibration ***,the numerical analysis method of ship-ice collision-induced vibration is not perfect,and the effect of fluid coupling is not typically *** this paper,a simplified numerical analysis method for ship-ice collision-induced vibration is proposed,in which a reliable ice load is obtained by first performing ship-ice-water-air coupled collision calculations,followed by ship-ice-water coupled vibration calculations to obtain the vibration response of the *** addition,this paper investigates the full coupling method and the modeling ranges and meshing sizes involved in the analysis ship-ice collision-induced vibration,and the computational efficiencies of the traditional ALE algorithm and S-ALE algorithm are *** results indicate that the simplified simulation analysis method and gradient meshing model improve the calculation accuracy and efficiency in ship-ice collision and vibration response ***,the modeling range of the water and air models cannot be less than 6 times the ship width,2 times the ship length,and 1 times the ship depth,and the S-ALE algorithm saves 47.86%time compared to the ALE *** research results in this paper can provide a reference for the numerical simulation of ship-ice collision-induced vibration.

关键词： Ship–ice collision Ice-induced vibration Ship–ice–water–air coupling Fluid–structure interaction S-ALE algorithm Gradient meshing model

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SoK: A Survey on Redundant Execution Technology

SoK: A Survey on Redundant Execution Technology

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2021 International Conference on Advanced computing and Endogenous Security, ICACES 2021

作者： Liu, Zijing Zhang, Zheng Xi, Ruicheng Zhu, Pengzhe Ma, Bolin State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9781665424493

Redundant execution technology is one of the effective ways to improve the safety and reliability of computer systems. By rationally configuring redundant resources, adding components with the same function, using the determined redundant execution logic to coordinate and efficiently execute synchronously can effectively ensure high availability of the machine and system. Fault-tolerant is based on redundant execution, which is the primary method of dealing with system hardware failures. Recently, multi-threading redundancy has realized the continuous development of fault-tolerant technology, which makes the processing granularity of the system tolerate random failure factors gradually reduced. At the same time, intrusion tolerant technology has also been continuously developed with the emergence of multi-variant execution technology. It mainly uses the idea of dynamic heterogeneous redundancy to construct a set of variants with equivalent functions and different structures to complete the detection and processing of threats outside the system. We summarize the critical technologies of redundant execution to achieve fault tolerance and intrusion tolerance in recent years, sorts out the role of redundant execution in the development process from fault tolerance technology to intrusion tolerance technology, classify redundant execution technologies at different levels, finally point out the development prospects of redundant execution technology in multiple application fields and future technical research directions. © 2022 IEEE.

关键词： Redundancy

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Cold sintering process:A green route to fabricate thermoelectrics

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Journal of Advanced Ceramics 2024年第11期13卷 1697-1712页

作者： Jinxue Ding Jing Guo Ruijuan Yan Wei Li Shuailing Ma Yanqin Fu Wenjie Xie Ralf Riedel Anke Weidenkaffa Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany State Key Laboratory for Mechanical Behavior of Materials&School of Materials Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Mechanical and Materials Engineering The University of Alabama at BirminghamBirmingham 35294USA Institute of High Pressure Physics School of Physical Scientific and TechnologyNingbo UniversityNingbo 315211China Henan Key Laboratory of High Performance Carbon Fiber Reinforced Composites Carbon Matrix Composites Research InstituteHenan Academy of SciencesZhengzhou 450046China Fraunhofer Research Institution for Materials Recycling and Resource Strategies IWKS Alzenau 63755Germany

Cold sintering is a newly developed low-temperature sintering technique that has attracted extensive attention in the fabrication of functional materials and *** sintering temperatures allow for a substantial reduction in energy consumption,and simple experimental equipment offers the possibility of large-scale *** cold sintering process(CSP)has been demonstrated to be a green and cost-effective route to fabricate thermoelectric(TE)materials where significant grain growth,secondary phase formation,and element volatilization,which are prone to occur during high-temperature sintering,can be well *** this review,the historical development,understanding,and application of thermoelectric materials produced via cold sintering are *** latest attempts related to the cold sintering process for thermoelectric materials and devices are discussed and *** some current technical challenges,cold sintering provides a promising and sustainable route for the design of advanced high-performance thermoelectrics.

关键词： cold sintering process(CSP) thermoelectrics(TEs) low-temperature sintering transport properties transient liquidphase

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WELL-POSEDNESS AND LARGE DEVIATIONS OF LÉVY-DRIVEN MARCUS STOCHASTIC LANDAU-LIFSHITZ-BARYAKHTAR EQUATION

arXiv

引用

arXiv 2024年

作者： Xu, Fan Liu, Bin Zhang, Lei School of Mathematics and Statistics Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and Technology Hubei Wuhan430074 China

This paper considers the stochastic Landau-Lifshitz-Baryakhtar (SLLBar) equation with pure jump noise in Marcus canonical form, which describes the dynamics of magnetic spin field in a ferromagnet at elevated temperatures with the effective field Heff influenced by external random noise. Under the natural assumption that the magnetic body O ⊂ Rd (d = 1, 2, 3) is bounded with smooth boundary, we shall prove that the initial-boundary value problem of SLLBar equation possesses a unique global probabilistically strong and analytically weak solution with initial data in the energy space H1(O). Then by employing the weak convergence method, we proceed to establish a Freidlin-Wentzell type large deviation principle for pathwise solutions to the SLLBar equation. Copyright © 2024, The Authors. All rights reserved.

关键词： Stochastic systems

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NEW GLOBAL CARLEMAN ESTIMATES AND NULL CONTROLLABILITY FOR FORWARD/BACKWARD SEMI-LINEAR PARABOLIC SPDES

arXiv

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arXiv 2024年

作者： Zhang, Lei Xu, Fan Liu, Bin School of Mathematics and Statistics Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and Technology Hubei Wuhan430074 China

In this paper, we study the null controllability for some linear and semi-linear parabolic SPDEs involving both the state and the gradient of the state. To start with, an improved global Carleman estimate for linear forward (resp. backward) parabolic SPDEs with general random coefficients and L2-valued source terms is derived. Based on this, we further develop a new global Carleman estimate for linear forward (resp. backward) parabolic SPDEs with H-1-valued source terms, which enables us to deal with the global null controllability for linear backward (resp. forward) parabolic SPDEs with gradient terms. As byproduct, a special energy-type estimate for the controlled system that explicitly depends on the parameters λ, μ and the weighted function θ is obtained. Furthermore, by employing a fixed-point argument, we extend the previous linear controllability results to some semi-linear backward (resp. forward) parabolic SPDEs. Copyright © 2024, The Authors. All rights reserved.

关键词： Controllability

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BOUNDARY VALUE METHODS FOR CA PUTO FR ACTIONAL DIFFERENTIAL EQUATIONS

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Journal of Computational Mathematics 2021年第1期39卷 108-129页

作者： Yongtao Zhou Chengiian Zhang Huiru Wang School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and TechnologyWuhan 430074China

This paper deals with the numerical computation and analysis for Caputo fractional differential equations(CFDEs).By combining the p-order boundary value methods(B-VMs)and the m-th Lagrange interpolation,a type of exte... 详细信息

关键词： Fractional differential equations Caputo derivatives Boundary value methods Local stability Unique solvability Convergence.

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KVM PT Based Coverage Feedback Fuzzing for Network key Devices 2

KVM PT Based Coverage Feedback Fuzzing for Network Key Devic...

引用

2nd International Conference on Computer engineering and Application, ICCEA 2021

作者： Zhiqiang, Lin Jianshan, Peng Yechuan, Bi Xiaowei, Li State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9781665426169

With the advent of the network era, network security has attracted more and more attention. As the key node in the network, network key devices play an important role in protecting the internal network and ensuring the network security. For the vulnerability of network key devices, security analysis has become an important concern of security personnel. Fuzzing is an automatic and effective vulnerability mining technology. In this paper, we propose the first coverage feedback fuzzy testing framework based on KVM PT technology for network key devices, aiming to solve the feasibility of applying fuzzy tools in network critical devices. At the same time, a fuzzy test agent technology based on firmware modification is proposed to help speed up the call of testcases. We evaluated the framework on Cisco ASA firewall, and trigger CVE-2018-0101, which proves the effectiveness of the framework. © 2021 IEEE.

关键词： Network security

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