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Advanced situation awareness, Human Vigilance, and Sensitivity in complex and dynamic Industrial systems: Perspectives towards enhancing Systems resilience under digitalization contexts 32nd

Advanced situation awareness, Human Vigilance, and Sensitivi...

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32nd European Safety and Reliability Conference, ESREL 2022

作者： Bakhshandeh, Mohammad Liyanage, Jayantha P. Department of Mechanical and Structural Engineering and Materials Science University of Stavanger Norway

ISBN: (纸本)9789811851834

Emerging industrial systems and solutions are such that the inherent complexity of the system, coupled with highly dynamic conditions, demand operators to perceive and judge abnormal situations, predict multiple scenarios based on unwanted deviations, and take proactive measures much ahead of time. The issue of how to enhance human situation awareness (SA) in such modern highly complex, interconnected, and dynamic systems is raising concerns of systems developers, asset operators, and authorities, especially when automation and digitalization show tendencies to keep the human "out of the loop" fully or partially. Based on recent industrial incidents and observations, we argue that the contemporary understanding of SA should be developed to an advanced SA level, the so-called Advanced Situation Awareness (Ad-SA), to ensure systems resilience early by mitigating potentials for unwanted events and losses. With respect to advancing digital solutions and applications, this paper is scrutinizing human vigilance and human sensitivity as critical integral issues towards such Ad-SA. Some selected industrial cases are reviewed to support arguments and to shed light on the pragmatism towards such new thinking. © 2022 ESREL2022 Organizers. Published by Research Publishing, Singapore.

关键词： Economic and social effects

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Numerical simulation of heat transfer and fluid flow around a cylinder of varying cross-section

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materials Today: Proceedings 2022年 65卷 2128-2137页

作者： Adebayo Olayemi, Olalekan Temitope Olabemiwo, Jekayinoluwa Osekhoghene Dirisu, Joseph Victor Ogunwoye, Oloruntobiloba Samsudeen Jolayem, Temidayo Elochukwu Anyaegbuna, Benjamin Abiola Olaniyan, Tirimisiyu Department of Aeronautics and Astronautics Faculty of Engineering and Technology Kwara State University Malete 241103 Nigeria Department of Mechanical Engineering Faculty of Engineering and Technology Covenant University Otta Ogun State 112233 Nigeria Department of Mechanical Engineering Faculty of Engineering and Technology University of Ilorin Ilorin 240003 Nigeria Department of Materials Science Engineering Faculty of Engineering and Technology Kwara State University Malete 241103 Nigeria

The present paper discusses the effects of geometric parameters on mixed convective heat transfer and fluid flow in a lid-driven square enclosure fitted with an internal elliptical cylinder. The side walls of the enclosure were kept at a cold constant temperature and the lower horizontal wall, and the top moving wall were isolated thermally while the elliptical cylinder wall was sinusoidal heated. The dimensionless equations were solved with the aid of COMSOL Multiphysics software which relies on the finite element method. Simulations were performed for different Grashof numbers 103≤Gr≤105, aspect ratios 1.0≤AR≤3.0, and inclination angle of the elliptical cylinder 0°≤≤90°. Results are presented in the form of velocity streamlines, isothermal contours, and average Nusselt number. Findings from this study show that the highest heat transfer enhancement occurred when Gr=105. Also, for all the inclination angles and Grashof numbers considered, the more the surface of the ellipse exposed to flow, the greater the heat transfer enhancement. Finally, beyond AR=1.5, inclination angle of the ellipse inhibits heat transfer enhancement. © 2021

关键词： Enclosures

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mechanical CHARACTERISTICS OF POWDERED ALUMINUM BRONZE OBTAINED FROM METALLURGICAL WASTE

International Journal of Mechatronics and Applied Mechanics

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International Journal of Mechatronics and Applied Mechanics 2022年第11期2022卷 95-97页

作者： Norkhudjayev, F.R. Mukhamedov, A.A. Nabiyev, B.N. Khodjimukhamedova, M.M. Teshaboyev, Abduvakhob Marifovich Department of Materials Science Faculty of Mechanics Tashkent State Technical University Uzbekistan Department of Engineering Technology Faculty of Engineering Technology Andijan Institute of Mechanical Engineering Uzbekistan Fargona Polytechnic Institute Uzbekistan

Currently, the main materials for the manufacture of sliding bearings are cast bronze and powder bronze, where the main alloying element is tin, the graphite content in these alloys is from 2 to 4%. At the same time, sintered bronze alloys, where the main alloying element is aluminum, have an advantage over both cast and sintered tin bronze. The advantage of aluminum bronze is the low cost of aluminum powder compared to tin powder, lower weight of sintered aluminum bronze bearing compared to the tin bronze bearing of the same size. The proposed article presents the results of studies of the mechanical characteristics of powdered aluminum bronze obtained from metallurgical waste with different percentages of aluminum powder and sulfur-containing pyrite additive (FeS2) replacing graphite. The results of studies on the effect of sintering temperature on the hardness and strength of aluminum bronze, as well as the effect of sulfur-containing additive-pyrite (FeS2) on the oil permeability and porosity of aluminum bronze, are presented). © 2022, Cefin Publishing House. All rights reserved.

关键词： Hardness

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A computational framework for guiding the MOCVD-growth of wafer-scale 2D materials

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npj Computational materials 2022年第1期8卷 2300-2307页

作者： Kasra Momeni Yanzhou Ji Nadire Nayir Nuruzzaman Sakib Haoyue Zhu Shiddartha Paul Tanushree H.Choudhury Sara Neshani Adri C.T.van Duin Joan M.Redwing Long-Qing Chen Department of Mechanical Engineering The University of AlabamaTuscaloosa35487ALUSA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity Park16802PAUSA Department of Mechanical Engineering Pennsylvania State UniversityUniversity Park16802PAUSA 2-Dimensional Crystal Consortium(2DCC)Materials Innovation Platform Materials Research InstituteThe Pennsylvania State UniversityUniversity ParkPA16802USA Department of Physics Karamanoglu Mehmetbey UniversityKaraman70000Turkey Department of Electrical Engineering The University of AlabamaTuscaloosa35487ALUSA

Reproducible wafer-scale growth of two-dimensional(2D)materials using the Chemical Vapor Deposition(CVD)process with precise control over their properties is challenging due to a lack of understanding of the growth mechanisms spanning over several length scales and sensitivity of the synthesis to subtle changes in growth conditions.A multiscale computational framework coupling Computational Fluid Dynamics(CFD),Phase-Field(PF),and reactive Molecular Dynamics(MD)was developed–called the CPM model–and experimentally *** between theoretical predictions and thorough experimental measurements for a Metal-Organic CVD(MOCVD)-grown WSe_(2)model material revealed the full power of this computational ***-area uniform 2D materials are synthesized via MOCVD,guided by computational *** developed computational framework provides the foundation for guiding the synthesis of wafer-scale 2D materials with precise control over the coverage,morphology,and properties,a critical capability for fabricating electronic,optoelectronic,and quantum computing devices.

关键词： MOCVD precise synthesis

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Cu-assisted austenite reversion and enhanced TRIP effect in maraging stainless steels

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Journal of materials science & Technology 2022年第9期104卷 52-58页

作者： M.C.Niu K.Yang J.H.Luan W.Wang Z.B.Jiao School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-changxu Innovation Center for Advance Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Materials Science and Engineering City University of Hong KongHong KongChina The Hong Kong Polytechnic University Shenzhen Research Institute ShenzhenGuangdongChina

Control of the formation and stability of reverted austenite is critical in achieving a favorable combination of strength,ductility,and toughness in high-strength *** this work,the effects of Cu precipitation on the austenite reversion and mechanical properties of maraging stainless steels were investigated by atom probe tomography,transmission electron microscopy,and mechanical *** results indicate that Cu accelerates the austenite reversion kinetics in two manners:first,Cu,as an austenite stabilizer,increases the equilibrium austenite fraction and hence enhances the chemical driving force for the austenite formation,and second,Cu-rich nanoprecipitates promote the austenite reversion by serving as heterogeneous nucleation sites and providing Ni-enriched chemical conditions through interfacial *** addition,the Cu precipitation hardening compensates the strength drop induced by the formation of soft reverted *** tensile deformation,the metastable reverted austenite transforms to martensite,which substantially improves the ductility and toughness through a transformation-induced plasticity(TRIP)*** Cu-added maraging stainless steel exhibits a superior combination of a yield strength of~1.3 GPa,an elongation of~15%,and an impact toughness of~58 J.

关键词： Maraging stainless steel TRIP effect Austenite reversion Cu-rich nanoprecipitate

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Phase evolution,defect chemistry,and electrical properties of Na_(0.5)Bi_(0.5)TiO_(3)-BiNi_(0.5)Ti_(0.5)O_(3) solid solutions

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Journal of materials science & Technology 2024年第29期196卷 148-161页

作者： Fan Yang Patrick Wu Yunzhu Du Derek C Sinclair Institute of Fuel Cells School of Mechanical EngineeringShanghai Jiao Tong University800 Dongchuan RoadMinhang DistrictShanghai 200240China Chongqing Research Institute of Shanghai Jiao Tong University Chongqing 401135China Department of Materials Science and Engineering University of SheffieldSir Robert Hadfield BuildingMappin StreetSheffieldS13JDUK

Solid solutions of Na_(0.5) Bi_(0.5) TiO_(3)(NBT)and BiNi_(0.5) Ti_(0.5) O_(3)(BNiT)were prepared by a solid-state reaction route,and their electrical properties investigated by a combination of impedance spectroscopy and electromotive force measurements to explore the possibility of developing mixed ionic-electronic conductors based on *** analysis showed that BNiT has a large solid solution limit in NBT(60 mol%based on X-ray diffraction),and the room temperature crystal structure changes from rhombohedral to pseudo-cubic with increasing BNiT *** diffraction revealed the coexistence of rhombohedral and tetragonal phases when the BNiT content≥40 mol%.Electrically,incorporation of BNiT induces p-type electronic conduction into NBT by hopping of holes between Ni^(2+)(Ni_(Ni)^(x))and Ni^(3+)(Ni·Ni),and therefore changes the electrical conduction mechanism systematically from predominant oxide-ion conduction to mixed ionic-electronic conduction and then to predominant p-type electronic *** total conductivity of the solid solutions showed a“V-shape”variation with increasing BNiT *** mechanisms for the phase evolution and the conductivity-composition relationships are *** high levels of ionic and electronic conductivity simultaneously in NBT by introducing elements with variable oxidation states remains challenging due to the competition between an enhanced electronic component and a suppressed ionic *** levels of BNiT incorporation are,however,beneficial to reducing the dielectric loss of NBT for dielectric applications.

关键词： Na_(0.5)Bi_(0.5)TiO_(3) BiNi_(0.5)Ti_(0.5)O_(3) Oxide-ion conduction Mixed ionic-electronic conduction Phase coexistence

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Unlocking of Schottky Barrier Near the Junction of MoS_(2)Heterostructure Under Electrochemical Potential

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Energy & Environmental materials 2025年第1期8卷 323-329页

作者： Kubra Aydin Mansu Kim Hyunho Seok Chulwoo Bae Jinhyoung Lee Muyoung Kim Jonghwan Park Joseph T.Hupp Dongmok Whang Hyeong-U Kim Taesung Kim SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan UniversitySuwon 16419Korea Department of Nano Science and Technology Sungkyunkwan UniversitySuwon 16419Korea Department of Chemistry Northwestern UniversityEvanstonIllinois 60208USA School of Advanced Material Science and Engineering Sungkyunkwan UniversitySuwon 16419Korea Semiconductor Manufacturing Research Center Korea Institute of Machinery and Materials(KIMM)Daejeon 34103Korea School of Mechanical Engineering Sungkyunkwan UniversitySuwon 16419Korea Center for Quantum Nanoscience Institute for Basic Science(IBS)Seoul 03760Korea 不详 Nano-Mechatronics University of Science&Technology(UST)Daejeon 34113Korea Department of Nano Engineering Sungkyunkwan UniversitySuwon 16419Korea

The exploration of heterostructures composed of two-dimensional(2D)transition metal dichalcogenide(TMDc)materials has garnered significant research attention due to the distinctive properties of each individual component and their phase-dependent unique *** the plasma-enhanced chemical vapor deposition(PECVD)method,we analyze the fabrication of heterostructures consisting of two phases of molybdenum disulfide(MoS_(2))in four different *** initial hydrogen evolution reaction(HER)polarization curve indicates that the activity of the heterostructure MoS_(2)is consistent with that of the underlying MoS_(2),rather than the surface activity of the upper MoS_(2).This behavior can be attributed to the presence of Schottky barriers,which include contact resistance,which significantly hampers the efficient charge transfer at junctions between the two different phases of MoS_(2)layers and is mediated by van der Waals ***,the energy barrier at the junction dissipates upon reaching a certain electrochemical potential,indicating surface activation from the top phase of MoS_(2)in the ***,the 1T/2H MoS_(2)heterostructure demonstrates enhanced electrochemical stability compared to its metastable 1T-MoS_(2).This fundamental understanding paves the way for the creation of phase-controllable heterostructures through an experimentally viable PECVD,offering significant promise for a wide range of applications.

关键词： hydrogen evolution reaction(HER) molybdenum disulfide(MoS_(2)) plasmaenhanced chemical vapor deposition(PECVD) Schottky barrier van der Waals(vdW)heterostructure

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A Review on Application of Poly(3,4-ethylenedioxythiophene) (PEDOT) in Rechargeable Batteries

Organic Materials

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Organic materials 2022年第4期4卷 292-300页

作者： Su, Laisuo Kumar, Shwetha Sunil Manthiram, Arumugam Reeja-Jayan, B. Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin Austin 78712 TX United States Department of Mechanical Engineering Carnegie Mellon University Pittsburgh 15213 PA United States

Since the very first patent on poly(3,4-ethylenedioxythiophene) (PEDOT) that was filed in 1988, this polymer has been widely utilized and has achieved great success owing to its high electrical conductivity and excellent stability. The application of the conducting polymer, PEDOT, in renewable energy devices, especially rechargeable batteries, is attracting increasing attention due to its potential to solve the energy and climate crisis. In this review, we summarize the research over the past few decades directed toward the application of PEDOT in rechargeable batteries aimed at improving their electrochemical performance. We focus on PEDOT synthesized via oxidative chemical vapor deposition (oCVD), a relatively new process known for its ability to grow conducting polymer thin films with uniform, pinhole-free properties, and controllable thickness and conformality. For a comparison purpose, PEDOT synthesized via solution-based methods is also briefly summarized. Finally, future research directions for applying oCVD PEDOT in rechargeable batteries are discussed. Introduction PEDOT Synthesis Methods Application of oCVD PEDOT in Rechargeable Batteries Applications of Solution-Based PEDOT in Rechargeable Batteries Conclusions and Outlook. © 2022. The Author(s).

关键词： batteries coating oxidative chemical vapor deposition (oCVD) polyethylene dioxythiophene (PEDOT)

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Tunable defect-engineered nanohybrid heterostructures: exfoliated 2D WSe2-MoS2 nanohybrid sheet covered on 1D ZnO nanostructures for self-powered UV photodetectors

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Journal of materials Chemistry C 2023年第18期11卷 6082-6088页

作者： Saravanan, Adhimoorthy Huang, Bohr-Ran Kathiravan, Deepa Sakalley, Shikha Chen, Sheng-Chi Graduate Institute of Electro-Optical Engineering and Department of Electronic and Computer Engineering National Taiwan University of Science and Technology Taipei106 Taiwan Department of Mechanical Engineering National Taiwan University of Science and Technology Taipei106335 Taiwan Department of Materials Engineering and Center for Plasma and Thin Film Technologies Ming Chi University of Technology New Taipei City24301 Taiwan College of Engineering and Center for Green Technology Chang Gung University Taoyuan333323 Taiwan

Future innovation of optoelectronic industrial applications for energy saving devices such as self-powered sensors and photodetectors have gained much research attention. Here, for the first time, two-dimensional (2D) WSe2@MoS2 nanohybrid sheet heterostructures covering one-dimensional (1D) ZnO nanorod (ZNR) based self-powered ultraviolet (UV) photodetectors are fabricated using a combination of the liquid exfoliation process and a hydrothermal technique. The WSe2@MoS2-ZNR device shows a high on/off current ratio (up to 17.2 × 103), and a fast response time (0.05/0.1 s) at 365 nm illumination under self-bias. In addition, an enhanced UV responsivity (1.6 A W−1) and outstanding photosensitivity (1.16 × 106%) were also observed. The excellent photoresponse, photosensitivity and responsivity were achieved due to strong interactions of the optical materials, enhanced light absorption and efficient charge separation of the present nanohybrid structure. This work provides reliable methodology for the fabrication of a unique 2D nanohybrid covered 1D nanostructure for use in self-powered optoelectronic devices and, useful for energy conservation. © 2023 The Royal Society of Chemistry.

关键词： Selenium compounds

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Photoplastic effect in organic–inorganic lead iodide perovskite thin films

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Journal of materials science: materials in Energy 2025年第1期1卷 1-6页

作者： Tunesi, Michele Liu, Yulin Lee, Jung-Kun Lucca, Don A. School of Mechanical and Aerospace Engineering Oklahoma State University Stillwater USA Department of Mechanical Engineering and Materials Science University of Pittsburgh Pittsburgh USA

The positive photoplastic effect (PPE) and photoinduced stiffening are the reversible increases of the flow stress and the elastic modulus of a material upon irradiation with light. Several material groups, including the II-VI compounds and alkali halides show some form of these effects. The dependence of mechanical properties on light illumination has not been reported for methylammonium lead iodide (CH3NH3PbI3 or MAPbI3) perovskites. In this study a positive PPE and photoinduced stiffening were found in MAPbI3 thin film perovskites. Thin films of 500 nm thickness were synthesized and then polished. The chemical formation of MAPbI3 was verified by x-ray diffraction. Atomic force microscopy and scanning electron microscopy were used to characterize the surface topography. Nanoindentation experiments were performed to investigate the elastic and plastic properties in darkness and under illumination. The elastic modulus and hardness were found to increase by 53% and 67% respectively when the perovskite was illuminated.

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