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Parameter sensitivity analysis of the axial stability for a marine flexible pipe

PETROLEUM 2024年第3期10卷 548-556页

作者： Tang, Liping Zou, Jiaxin Song, Kenan Shi, Yongheng Liu, Li Southwest Petr univ Sch Mechatron Engn Chengdu 610500 Peoples R China univ aberdeen Sch Engn Aberdeen AB24 3UE Scotland Natl Petr & Nat Gas Pipeline Network Grp Co Ltd Oil & Gas Control Ctr Beijing 100020 Peoples R China

Marine unbonded flexible pipes serve as the most essential equipment in offshore oil and gas exploration and exploitation. Axial compressive loads during installation or in service in the complex marine environment usually lead to buckling failure. A flexible pipe is a composite structure with multiple functional layers, of which the tensile armor layer plays a key role with regard to the response of the pipe subjected to axial loads. In this paper, a simplified three-dimensional finite element model is developed, focusing on the tensile layer and replacing the carcass layer, pressure sheath layer, and pressure armor layer by a cylindrical rigid body to reduce computational expense. By using this model, the buckling failure modes of the tensile armor layer (in particular the birdcaging phenomenon) are analyzed. Several key parameters that affect the stability of the flexible pipe under axial compression and torsion are emphasized, and their effects on its axial and torsional stiffness are compared and discussed. The results show that both the lay angle of the steel wires and the interlayer friction coefficient have a significant influence on the axial and torsional stiffness of the pipe, whereas the damaged length of the outer sheath has virtually no effect. (c) 2023 Southwest Petroleum university. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http:// ***/licenses/by-nc-nd/4.0/).

关键词： Flexible pipe Tensile armor Buckling failure Key parameters Stiffness LATERAL BUCKLING FAILURE TENSILE ARMOR PREDICTION MODES WIRES

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Two-step exhumation of Caucasian intraplate rifts:A proxy of sequential plate-margin collisional orogenies

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Geoscience Frontiers 2024年第2期15卷 68-84页

作者： William Cavazza Thomas Gusmeo Massimiliano Zattin Victor Alania Onise Enukidze Sveva Corrado Andrea Schito Department of Biological Geologicaland Environmental SciencesUniv.of BolognaItaly Department of Geosciences Univ.of PaduaItaly Institute of Geophysics I.Javakhishvili State UniversityTbilisiGeorgia Department of Sciences Roma Tre UniversityRomeItaly Department of Geology and Geophysics Univ.of AberdeenUnited Kingdom

Intraplate structural deformation is diagnostic of tectonic stress regime changes linked to plate interactions and can result from superposed tectonic events whose single contributions are hardly *** this paper,we present a set of integrated thermochronologic inverse models along a 140 km-long transect across the central Greater Caucasus and the adjacent Adjara-Trialeti fold-and-thrust belt of Georgia,two intraplate orogens produced by structural inversion of parallel continental rift zones located on the Eurasian *** dataset allows to distinguish discrete and superposed deformation episodes and quantify their respective contributions to orogenic *** integration of(U-Th)/He analysis on apatite and zircon,fission-track analysis on apatite,and peak-temperature determinations(clay mineralogy,organic matter petrography,Raman spectroscopy)shows that structural inversion was punctuated by two incremental steps starting respectively in the latest Cretaceous and the *** Cretaceous partial inversion of the Greater Caucasus is documented here for the first time and placed in a geographically wider context of coeval *** two episodes of intraplate structural inversion,exhumation,and sediment generation are chronologically and physically correlated with docking of(i)the Anatolide-Tauride-Armenian terrane(Late Cretaceous-Paleocene)and(ii)Arabia(Miocene hard collision)against the southern Eurasian plate *** deformation in the Caucasian domain was triggered by far-field propagation of plate-margin collisional stress which focused preferentially along rheologically weak rift zones.

关键词： Intraplate deformation Far-field tectonics Greater Caucasus Structural reactivation Terrane accretion

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Building a resilient future: collaborative sustainability regulation

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CLEAN ENERGY 2024年第3期8卷 223-237页

作者： Job, Jovita Shanta Khanna, Shivi Christ univ Bangalore India Christ univ Sch Business & Management Bangalore India

The challenge of sustainability lies in achieving a balance between satisfying present needs and protecting resources for future generations with an emphasis on its three pillars-environmental, social and governance. This study explored sustainable development encompassing environmental, social and governance aspects along with sustainability reporting through various sustainability frameworks. A systematic review of literature for the period 2010-23 on major worldwide sustainability frameworks was conducted, by offering insights into enhancing reporting mechanisms for a sustainable future. Secondary data related to sustainability reports were obtained from the Sustainability Accounting Standards Board and International Integrated Reporting Council, which helped in examining sector and year variations across countries. The results reflected that mandatory sustainability disclosures help to meet the United Nations Sustainable Development Goals and global sustainability frameworks help to set standards, disseminate information and promote transparency. Collaboration of investment, company action and sustainability organizations can lead to a sustainable global economy. The adoption of sustainability reporting can help organizations by fostering a proper understanding of sustainability practices, improving transparency and identifying potential business opportunities in sectors with lower sustainability. The paper provided insights into sustainability reporting published across various countries in both advanced as well as emerging and developing economies. The analysis showed which sectors and time periods have had the most sustainability reports and which areas needed to be targeted for action to advance sustainable development. This study examines sustainability reporting methods by looking at frameworks and reports from 2010-2023. Researchers analyse data from sustainability organizations to understand how reporting can improve transparency and align with global go

关键词： Environmental Social and Governance (ESG) Sustainable Development Goals Sustainability Reporting Developing economies Advanced economies

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A reduced model for particle calcination for use in DEM/CFD simulations

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PARTICUOLOGY 2024年第10期93卷 316-327页

作者： Mieg, Lucas Bergold, Torben Mahiques, Enric Illana Scherer, Viktor Moennigmann, Martin Ruhr univ Bochum Automat Control & Syst Theory Bochum Germany Ruhr univ Bochum Energy Plant Technol Bochum Germany

We treat the accurate simulation of the calcination reaction in particles, where the particles are large and, thus, the inner-particle processes must be resolved. Because these processes need to be described with coupled partial differential equations (PDEs) that must be solved numerically, the computation times for a single particle are too high for use in simulations that involve many particles. Simulations of this type arise when the Discrete Element Method (DEM) is combined with Computational Fluid Dynamics (CFD) to investigate industrial systems such as quicklime production in lime shaft kilns. We show that, based on proper orthogonal decomposition and Galerkin projection, reduced models can be derived for single particles that provide the same spatial and temporal resolution as the original PDE models at a considerably reduced computational cost. Replacing the finite volume particle models with the reduced models results in an overall reduction of the reactor simulation time by about 40% for the sample system treated here. (c) 2024 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. This is an open access article under the CC BY license (http:// ***/licenses/by/4.0/).

关键词： Calcination Reactive bulk Model reduction Discrete element method Galerkin projection SOLID HEAT-TRANSFER DEM-CFD SIMULATION MASS-TRANSFER WOOD CHIPS DECOMPOSITION COMBUSTION REDUCTION LIMESTONE DYNAMICS FLOW

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Synthesis and Characterization of a Novel Gallophosphate with Ethylene Glycol

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Chemical Research in Chinese universities 1995年第4期11卷 357-359页

作者： KAN Qiu-bin and XU Ru-ren(Department of Chemistry,Jiliu university,Changchun,130023)Glasser,F.P. (Dept.of Chem.,university of aberdeen,Meston Walk, Old aberdeen AB9 2UE,U,K.) JILIN univ DEPT CHEMCHANGCHUN 130023PEOPLES R CHINA univ aberdeen DEPT CHEMOLD ABERDEEN AB9 2UESCOTLAND

ＳｙｎｔｈｅｓｉｓａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆａＮｏｖｅｌＧａｌｌｏｐｈｏｓｐｈａｔｅｗｉｔｈＥｔｈｙｌｅｎｅＧｌｙｃｏｌＫＡＮＱｉｕ－ｂｉｎａｎｄＸＵＲｕ－ｒｅｎ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓ... 详细信息

ＳｙｎｔｈｅｓｉｓａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆａＮｏｖｅｌＧａｌｌｏｐｈｏｓｐｈａｔｅｗｉｔｈＥｔｈｙｌｅｎｅＧｌｙｃｏｌＫＡＮＱｉｕ－ｂｉｎａｎｄＸＵＲｕ－ｒｅｎ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＪｉｌｉｕＵｎｉｖｅｒｓｉ...

关键词： Gallophosphate Ethylene glycol Synthesis

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Research of simulation and experiment on arc characteristics of gas mechanical switch

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HIGH VOLTAGE 2024年第3期9卷 626-635页

作者： Jiang, Cheng Qu, Lu Yu, Zhangqing Gan, Zhizheng Yan, Xin Zeng, Rong Huang, Yulong Li, Shaofu Tsinghua univ Dept Elect Engn Beijing Peoples R China Southwest univ Sci & Technol Sch Informat Engn Mianyang Peoples R China Tsinghua univ Sichuan Energy Internet Res Inst Chengdu Peoples R China

An arc is the high-temperature discharge plasma produced in the opening process of mechanical switches, which directly affects the breaking capability of a hybrid DC circuit breaker. According to the physical mechanism of an electric arc, the construction of an arc model for simulation analysis is an important technical means in the electrical field. In this study, based on the theory of magneto hydrodynamics (MHD), a gas mechanical switch model of a natural commutation DC circuit breaker with a compound gap is established. The arc motion process under different conditions is simulated and calculated. The influence of different initial pressures, different opening speeds, and different striking currents on the arc voltage characteristics is analysed. The results show that the larger the gas pressure, the smaller the arc volume and the higher the arc voltage. The faster the opening speed, the longer the arc and the higher the arc voltage; with the increase of the current, the arc voltage increases rapidly at a low current, while the arc voltage increases slowly at a high current.

关键词： CIRCUIT-BREAKER COEFFICIENTS

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Prism blockchain enabled Internet of Things with deep reinforcement learning

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BLOCKCHAIN-RESEARCH AND APPLICATIONS 2024年第3期5卷 78-88页

作者： Gadiraju, Divija Swetha Aggarwal, Vaneet univ Nebraska Omaha NE 68182 USA Purdue univ W Lafayette IN 47907 USA

This paper presents a Deep Reinforcement Learning (DRL) based Internet of Things (IoT)-enabled Prism blockchain. The recent advancements in the field of IoT motivate the development of a secure infrastructure for storing and sharing vast amounts of data. Blockchain, a distributed and immutable ledger, is best known as a potential solution to data security and privacy for the IoT. The scalability of blockchain, which should optimize the throughput and handle the dynamics of the IoT environment, becomes a challenge due to the enormous amount of IoT data. The critical challenge in scaling blockchain is to guarantee decentralization, latency, and security of the system while optimizing the transaction throughput. This paper presents a DRL-based performance optimization for blockchain-enabled IoT. We consider one of the recent promising blockchains, Prism, as the underlying blockchain system because of its good performance guarantees. We integrate the IoT data into Prism blockchain and optimize the performance of the system by leveraging the Proximal Policy Optimization (PPO) method. The DRL method helps to optimize the blockchain parameters like mining rate and mined blocks to adapt to the environment dynamics of the IoT system. Our results show that the proposed method can improve the throughput of Prism blockchain-based IoT systems while preserving Prism performance guarantees. Our scheme can achieve 1.5 times more system rewards than IoT-integrated Prism. In our experimental setup, the proposed scheme could improve the average throughput of the system by about 6,000 transactions per second compared to Prism.

关键词： Blockchain IoT Deep Reinforcement Learning

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Enhancing rock fragmentation prediction in mining operations: A Hybrid GWO-RF model with SHAP interpretability

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JOURNAL OF CENTRAL SOUTH univERSITY 2024年第8期31卷 2916-2929页

作者： Zhang, Yu-lin Qin, Yin-gui Armaghsni, Danial Jahed Monjezi, Masoud Zhou, Jian Cent South univ Sch Resources & Safety Engn Changsha 410083 Peoples R China Jianghan univ State Key Lab Precis Blasting Wuhan 430056 Peoples R China Jianghan univ Hubei Key Lab Blasting Engn Wuhan 430056 Peoples R China univ Technol Sydney Sch Civil & Environm Engn Sydney NSW 2007 Australia Tarbiat Modares univ Fac Engn Dept Min Tehran 14115143 Iran

In the mining industry, precise forecasting of rock fragmentation is critical for optimising blasting processes. In this study, we address the challenge of enhancing rock fragmentation assessment by developing a novel hybrid predictive model named GWO-RF. This model combines the Grey Wolf Optimization (GWO) algorithm with the Random Forest (RF) technique to predict the D80 value, a critical parameter in evaluating rock fragmentation quality. The study is conducted using a dataset from Sarcheshmeh copper mine, employing six different swarm sizes for the GWO-RF hybrid model construction. The GWO-RF model's hyperparameters are systematically optimized within established bounds, and its performance is rigorously evaluated using multiple evaluation metrics. The results show that the GWO-RF hybrid model has higher predictive skills, exceeding traditional models in terms of accuracy. Furthermore, the interpretability of the GWO-RF model is enhanced through the utilization of SHapley Additive exPlanations (SHAP) values. The insights gained from this research contribute to optimizing blasting operations and rock fragmentation outcomes in the mining industry.

关键词： blasting rock fragmentation random forest grey wolf optimization hybrid tree-based technique MACHINE MINE

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Assessment of energy consumption, environmental effects and fuel costs of the bus rapid transit system in Bogota (Colombia)

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CLEAN ENERGY 2024年第3期8卷 34-47页

作者： Perez, Jhon Jairo Correa, Luis Hernando Ostergaard, Poul Alberg Cabrera, Pedro univ La Salle Engn Fac Elect Dept Campus Candelaria Bogota Colombia Aalborg univ Dept Planning Rendsburggade 14 DK-9000 Aalborg Denmark univ Las Palmas Gran Canaria Dept Mech Engn Campus Univ Tafira Las Palmas Gran Canaria Spain

Colombia aims to boost the utilization of mass transportation systems in its major cities while simultaneously reducing greenhouse gas emissions by 20%, in alignment with the commitments of the COP21 agreement. In 2020, the transport sector in Colombia accounted for 34.4% of the country's energy demand and was responsible for similar to 49% of its total CO2 emissions. This article presents an assessment of energy consumption, environmental effects and the fuel costs of Bogota's bus rapid transit system based on the Activity, Share, Intensity, Fuel methodology. A long-term analysis spanning from 2021 to 2040 was developed using the long-range energy alternatives planning platform. To conduct this assessment, the tool was calibrated using data from 2019 and 2020. Four distinct scenarios based on energy policies implemented in Bogota were examined: Business as Usual, Fast Transition, High Growth and Low Growth. Regarding energy consumption and environmental effects, the results underscore the pivotal role of diversifying energy sources and reducing reliance on fossil fuels such as oil. Consequently, the analysis emphasizes the urgent need to accelerate the transition to alternative energy sources such as natural gas and electricity. [GRAPHICS] .

关键词： ASIF energy consumption environmental effects LEAP long-term energy model public transport GREENHOUSE-GAS EMISSIONS BOTTOM-UP TRANSPORTATION SECTOR AIR-POLLUTION BRT SYSTEM DEMAND TRENDS IMPACT PERFORMANCE POLICIES

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Experimental validation of double-fed induction generator in oscillating water column using circulatory system-based optimization

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CLEAN ENERGY 2024年第2期8卷 127-143页

作者： Elnaghi, Basem E. Ismaiel, Ahmed M. Abdel-Kader, Fathy El Sayed Mohammed, Reham H. Abelwhab, M. N. Suez Canal univ Elect Power & Machine Dept Ismailia Egypt Menoufia univ Fac Engn Elect Machine & Power Dept Menoufia Egypt Suez Canal univ Comp & Control Dept Ismailia Egypt

This paper validates the optimal operation for a grid-connected double-fed induction generator (DFIG) in an oscillating water column power plant (OWCPP). This study presents a novel optimization technique called the circulatory system-based optimization (CSBO) approach to develop six adaptive fuzzy logic controllers (AFLCs) with 30 parameters and compare them to chaotic-billiards optimization (C-BO) and genetic algorithm (GA). The proposed controller is also compared with a proportional-integral differential (PID) controller based on a self-adaptive global-best harmony search (SGHS). CSBO-based AFLCs are fully investigated under different scenarios and experimented with using a real-time interface DSP1104. The results of using CSBO-AFLCs revealed a fast time response, fast convergence, less overshoot and minimal error compared with those achieved with C-BO-AFLC, SGHS-PID and GA-AFLC during different case studies. The CSBO-based AFLCs ensure maximum power from the DFIG in an OWCPP and enhance dynamic response with very low errors. The results show that the CSBO shows better power tracking by 25% as compared with C-BO, by 45% when compared with the GA and by 56% when compared with PID. Moreover, the integral absolute errors of six controllers are investigated to demonstrate the feasibility of CSBO-AFLC. The root mean square of the errors of six controllers using CSBO is improved by 68.27% when compared with GA, by 22.57% when compared with C-BO and by 38.42% when compared with PID. These indicators demonstrate the feasibility of CSBO when compared with other algorithms with the same OWCPP. This paper validates the optimal operation of a grid-connected double-fed induction generator in an oscillating water column using a novel optimization technique called the circulatory system-based optimization approach. Experiments using a real-time simulator demonstrate the feasibility of the approach when compared with other algorithms. Graphical Abstract

关键词： circulatory system-based optimization approach adaptive fuzzy logic controller grid-tied oscillating water column power plant maximum power point tracking WAVE ENERGY-CONVERSION DESIGN OPTIMIZATION ALGORITHM CONTROLLER TURBINE

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