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arXiv 2022年

作者： Mojumder, Satyajit van Beek, Anton Islam, Zahabul Qian, Dong Liu, Wing Kam Theoretical and Applied Mechanics Program Northwestern University EvanstonIL United States School of Mechanical and Materials Engineering University College Dublin Dublin Ireland Mechanical and Manufacturing Engineering Technology Bowling Green State University Bowling GreenOH United States Department of Mechanical Engineering University of Texas DallasTX United States Department of Mechanical Engineering Northwestern University EvanstonIL United States HIDENN-AI LLC IL United States

Defects such as voids are observed at multiple length scales of an additively manufactured composite material. Modeling such defects and their multiscale interaction is crucial for the material’s performance prediction. In this work, we study as-built defects in fused filament fabricated Polycarbonate/Short Carbon Fiber (PC/SCF) composite samples. The microscale and mesoscale voids along with the mesoscale layer orientations have been studied using a mechanistic reduced-order model. Our result indicates that the microscale intrabead voids interact with the mesoscale interbead voids and significantly degrade the mechanical response of the printed composites compared to the microscale microstructure without voids. The mesoscale layer orientations also influence the stress-strain response and show better performance when the load is applied to the bead direction. The efficient reduced-order modeling approach used in this work provides a way to evaluate multiscale design aspects of additively manufactured composite materials. © 2022, CC BY.

关键词： Defects

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Ecological risk assessment of potentially toxic elements (PTEs) in agricultural soil, vegetables and fruits with respect to distance gradient in proximity to lead-acid battery industry

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Environmental Nanotechnology, Monitoring and Management 2024年 21卷

作者： Lima, Fatema Akter Bhattacharjee, Shovon Jahangir Sarker, Md. Salam, Mohammed Abdus Department of Environmental Science and Disaster Management Noakhali Science and Technology University Noakhali 3814 Bangladesh Biosecurity Program Kirby Institute University of New South Wales (UNSW Sydney) Kensington 2052 NSW Australia Mechanical and Manufacturing Engineering University of New South Wales (UNSW Sydney) Kensington 2052 NSW Australia Department of Fisheries and Marine Science Noakhali Science and Technology University Noakhali 3814 Bangladesh

Lead-acid battery industries in Bangladesh have proliferated in urban areas, leading to the release of significant amounts of potentially toxic elements (PTEs) and metalloids into the environment. This study aimed to assess the spatial distribution, sources, contamination status, and ecological risks in agricultural soils, vegetables, and fruits near these industries. Soil samples were collected from four sites at varying distances (0 m, 100 m, 250 m, and 500 m) around three lead-acid battery industries (AA, AB, and AC) in Dhaka and Gazipur Districts during June-July 2020. The concentrations of the Pb, As, Cd and Zn in agricultural soils were ranged between 8.40–116.61, 8.99–28.21, 0.03–1.28, and 25.38–68.72 mg/kg, respectively. The concentrations of Pb, As, and Cd were found to be considerably higher than background levels across all industries, with a gradual decrease in PTE concentrations from 0 m to 500 m. The contamination factor indicated high to moderate contamination in agricultural soils by As, Cd, and Pb, and low contamination by Zn. pollution load index, modified contamination degree, and nemerow comprehensive index revealed varying pollution levels in the vicinity of the industries, with AA and AB showing higher pollution compared to AC. The individual risk factors demonstrated significant risks associated with Cd and As exposure, while Pb and Zn posed lower risks. The potential ecological risk index indicated considerable ecological risk for AA (risk index = 192.41), moderate risk for AB (risk index = 111.80), AC (risk index = 65.08), respectively. Correlation and principal component analysis revealed strong positive associations (p < 0.01) among the chemical parameters and potentially toxic elements in soils, and demonstrated the lead-acid battery industry as the primary contamination source in the studied areas. There were strong positive relationships (p < 0.01) existed between As, Cd, and Zn in soils and vegetables;while a strong negative associatio

关键词： Hazardous materials Lead-acid battery Potentially toxic elements (PTEs) Risk assessment Soil contamination Vegetables and fruits

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Unlocking development of green hydrogen production through techno-economic assessment of wind energy by considering wind resource variability: A case study

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International Journal of Hydrogen Energy 2024年

作者： Hesty, Nurry Widya Aminuddin Supriatna, Nina Konitat Cendrawati, Dian Galuh Nurliyanti, Vetri Nurrohim, Agus Fithri, Silvy Rahmah Niode, Nona Al Irsyad, Muhammad Indra Research Center for Energy Conversion and Conservation National Research and Innovation Agency KST Habibie Serpong Tangerang Selatan153432 Indonesia Research Center for Process and Manufacturing Industry Technology National Research and Innovation Agency KST Habibie Serpong Banten Tangerang Selatan153143 Indonesia Magister of Industrial Engineering University of Mercu Buana Jakarta11650 Indonesia Departement of Mechanical Engineering Universitas Indonesia 16424 Indonesia Survey and Testing Center for Electricity New Renewable Energy and Energy Conservation Technology Ministry of Energy and Mineral Resources Jakarta12230 Indonesia Study Program of Advanced Climatology Departement of Geophysics and Meteorologi IPB University Bogor16680 Indonesia Research Center for Behavioral and Circular Economics Jl. Gatot Subroto No.10 Jakarta12710 Indonesia

Generating hydrogen from renewable energy sources is widely recognized as an effective strategy for addressing critical challenges in the energy sector while contributing to the reduction of greenhouse gas emissions. This study aims to assess the wind energy potential for electricity and hydrogen production in five locations on Sumba Island using 10 years (2011–2020) of data from the NASA's POWER Project. A wind variability assessment was performed on five wind turbines ranging from 500 kW to 1.5 MW and using electrolysis technology. The results indicated a hydrogen production potential of 25–57 tons per year. Economic analysis of hydrogen production for Haharu reveals an attractive internal rate of return (IRR) of 43% with a payback period (PBP) of 2.25 years and a net present value (NPV) of 1.3 MM USD, the levelized cost of electricity (LCOE) of 0.0241 USD/kWh, and the levelized cost of Hydrogen (LCOH) of 1.01 USD/kg. Sensitivity analysis underscores the critical influence of investment and revenue on project profitability, highlighting their substantial impact on determining a project's success or failure. These findings emphasize the potential of Sumba Island as a hub for sustainable energy production to meet the growing demand for clean and renewable energy sources. © 2024 Hydrogen Energy Publications LLC

关键词： Clean energy

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Crack Catcher AI — Enabling Smart Fracture Mechanics Approach for Damage Control in Thin Silicon Wafers for 3D Semiconductor Integrated Devices/Packages

Crack Catcher AI — Enabling Smart Fracture Mechanics Approa...

引用

Annual International Symposium on Reliability Physics

作者： Gabriel Preston Greer Gonzolez Andrea S. Karnyoto Fitya S. Mozar Matthew M. Henry Mahmud Isnan Kuncahyo S. Nugroho Henry Candra Muhamad Doris Dianing N. N. Putri Tyas K Sari Bens Pardamean Endang Djuana Derrric Speaks Arief S. Budiman Oregon Renewable Energy Center (OREC) Oregon Institute of Technology (Oregon Tech) Klamath Falls OR USA Dept. of Manufacturing & Mechanical Eng. & Tech. (MMET) Oregon Institute of Technology Klamath Falls OR USA Bioinformatics & Data Science Research Center (BDSRC) Bina Nusantara University Jakarta Indonesia Computer Sci. Dept. BINUS Grad. Program - Master of Computer Sci. Bina Nusantara University Jakarta Indonesia Computer Science Department School of Computer Science Bina Nusantara University Jakarta Indonesia Center for Artificial Intelligence and Advanced Technology (CAPTIVATE) Universitas TRISAKTI Jakarta Indonesia Department of Electrical Engineering Faculty of Industrial Technology Universitas TRISAKTI Jakarta Indonesia Industrial Eng. Dept. BINUS Grad. Program – Master of Industrial Eng. Bina Nusantara University Jakarta Indonesia

ISBN: (数字)9798331504779

ISBN: (纸本)9798331504786

The importance of silicon cannot be undermined - in photovoltaics (PV) as well as in semiconductor industries. However, silicon is very brittle. Silicon cells/wafers crack easily during manufacturing assembly and/or during device operations. Crack Catcher AI uses novel smart fracture mechanics approach with Artificial Intelligence (AI) methodologies to predict and control crack/damage evolution in thin silicon cells/wafers. This is critical as semiconductor 3D integration technology calls for wafer-to-wafer bonding with utmost alignment accuracy and yield/reliability.

关键词： Semiconductor device measurement Three-dimensional displays Accuracy Semiconductor device reliability Silicon Artificial intelligence Bonding Stress Three-dimensional integrated circuits Stress measurement

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Air Jet Erosion Study on Stir Casted Metal Matrix Composite Aluminum-SiC 1

Air Jet Erosion Study on Stir Casted Metal Matrix Composite ...

引用

1st International Conference on Design and Application of engineering Materials 2018, IC-DAEM 2018 in conjunction with 11th Seminar Nasional Metalurgi dan Material, SENAMM 2018

作者： Longalayuk, M. Ruskandi, C. Setiamarga, B.H. Materials Engineering Study Program Faculty of Mechanical and Aerospace Engineering Institute of Technology Bandung Indonesia Foundry Technology Department Bandung Manufacturing Polytechnics Indonesia

For equipment that operates in high-speed abrasive media, erosion will be the major factor for its failure. Metal Matrix Composite (MMC) Aluminum-Silicon Carbide has been developed for improving the lifetime for such application. In this research, MMC Al-SiC has been made using Al-7075 scrap with 5%, 10%, and 15% SiC powder addition. This MMC was manufactured using stir casting technique with 1% Magnesium addition. Optical metallography has been done to know the SiC distribution homogeneity. Erosion resistance of the MMC was studied using Air Jet Erosion Test with Alumina powder as abrasives. The microstructural study showed that MMC Al-SiC has been successfully manufactured although the SiC particle distribution has not been fully homogeneous yet. Air Jet Erosion Testing revealed that the addition of 5% SiC powder was optimal in increasing its erosion resistance. The SiC addition from 10 to 15% did not improve its erosion resistance significantly. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Silicon carbide

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Frustrated metastable-to-equilibrium grain boundary structural transition in NbMoTaW due to segregation and chemical complexity

arXiv

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arXiv 2023年

作者： Geiger, Ian Apelian, Diran Pan, Xiaoqing Cao, Penghui Luo, Jian Rupert, Timothy J. Material and Manufacturing Technology University of California IrvineCA92697 United States Department of Materials Science and Engineering University of California IrvineCA92697 United States Department of Physics and Astronomy University of California IrvineCA92697 United States Department of Mechanical and Aerospace Engineering University of California IrvineCA92697 United States Department of NanoEngineering University of California San Diego La Jolla CA92093 United States Program in Materials Science and Engineering University of California San Diego La Jolla CA92093 United States

Grain boundary structural transitions can lead to significant changes in the properties and performance of materials. In multi-principal element alloys, understanding these transitions becomes complex due to phenomena such as local chemical ordering and multi-component segregation. Using atomistic simulations, we explore a metastable-to-equilibrium grain boundary structural transition in NbMoTaW. The transition, characterized by structural disordering and reduced free volume, shows high sensitivity to its local chemical environment. Most notably, the transition temperature range of the alloy is more than twice that of a pure metal. Differences in composition between coexisting metastable and equilibrium structures highlight the change in local site availability due to structural relaxation. Further examination of grain boundaries with fixed chemical states at varying temperatures reveals that the amount of segregation significantly influences the onset temperature yet has minimal effect on the transition width. These insights underscore the profound effect of chemical complexity and ordering on grain boundary transitions in complex concentrated alloys, marking a meaningful advancement in our understanding of grain boundary behavior at the atomic level. Copyright © 2023, The Authors. All rights reserved.

关键词： Grain boundaries

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Corporate Venture Capital and Sustainability

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Journal of Open Innovation: technology, Market, and Complexity 2022年第3期8卷

作者： Döll, Luciano Mathias Ulloa, Micaela Ines Castillo Zammar, Alexandre Prado, Guilherme Francisco do Piekarski, Cassiano Moro Post-Graduation Program of Production Engineering Federal University Technology (UTFPR) Ponta Grossa 84016-210 Brazil Department of Informatics Universidade Estadual de Ponta Grossa (UEPG) Ponta Grossa 84030-900 Brazil Coordination of Technology in Mechanical Manufacturing Instituto Federal de Santa Catarina (IFPR) Florianópolis 88020-300 Brazil

Corporate Venture Capital (CVC) has been receiving increasingly more attention all over the world as a special way for accessing new ideas and innovative opportunities through minor-share investing in established companies. The purpose of CVC investments may either be purely financial or to pursue strategic goals. Organisations often seek to take actions that impact positively on sustainability by assembling related knowledge and technologies. These resources may come from invested startups through the use of a CVC programme. This research aims to measure and analyse the Corporate Venture Capital programmes of companies listed in the ISE B3 Corporate Sustainability Index. To this end, a three-step methodology was conducted. First, a systematic review of the literature took place, followed by a review of companies based on secondary sources such as their websites. Finally, a survey was developed and was opted to survey companies through their Investor Relationship (IR) public channels. Results show that 27 of the companies listed in the ISE B3 Index have CVC programmes that contemplate organizational initiatives besides investment. In this sense, one can claim that at least 70% of the ISE B3 Index companies are somehow involved in CVC operations. The results contribute to the literature on corporate venture capital and sustainability by showing that companies spend from 10% to 15% of their capital in sustainable businesses in order to remain competitive. © 2022 by the authors.

关键词： corporate venture capital open innovation startups sustainability

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Minimizing Urban Logistics Cost Using Crowd-Shipping 2019

Minimizing Urban Logistics Cost Using Crowd-Shipping

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Proceedings of the 3rd International Conference on Vision, Image and Signal Processing

作者： Chandra Restu Pakarti Stefano Starita Logistics and Supply Chain Systems Engineering Program School of Manufacturing Systems and Mechanical Engineering Sirindhorn International Institute of Technology Thammasat University Pathum Thani Thailand Logistics and Supply Chain Systems Engineering Program School of Manufacturing Systems and Mechanical Engineering Sirindhorn International Institute of Technology Thammasat UniversityPathum Thani Thailand

ISBN: (纸本)9781450376259

This study aims to determine the extent to which crowd-shipping delivery can reduce shipping costs. An extension of the classic Capacitated Vehicle Routing Problem (CVRP) is studied to model the possibility of performing deliveries using private citizen. A probabilistic model is incorporated to estimate the likelihood of finding a crowd-shipper for a given compensation. The model is applied to a logistics company based in Bandung, Indonesia. Results indicate significant advantages in using crowd-shipper as opposed to the traditional method. Specifically, costs can be reduced by about 20% and carbon dioxide (CO2) emissions can be reduced by 21% when a base scenario price sensitivity is considered. Overall, the case study suggests potential economic and environmental benefits relying on Occasional Couriers (OC's).

关键词： Crowd-Shipping Vehicle Routing Problem Sustainable Logistics

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The Petiole of the Miriti Palm: A sustainable material for wind turbine blades?

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Journal of Physics: Conference Series 2024年第8期2767卷 082007-082007页

作者： I. Dos S. Gomes J. R. P. Vaz J. C. H. Wong D. H. Wood Graduate Program in Natural Resources Engineering Institute of Technology Federal University of Para Belém Pará 66075-110 Brazil Graduate Program in Natural Resources Engineering Institute of Technology Federal University of Para Ananindeua Pará 67130-660 Brazil Department of Mechanical and Manufacturing Engineering University of Calgary Calgary Alberta T2N 1N4 Canada

The Miriti Palm (Mauritia flexuosa) grows abundantly in the Amazon Region of Brazil. The petiole (PMP) that supports the leaves, has a density of about one-half of Balsa wood (BW), which is used in the manufacture of wind turbine blades. A further possible advantage of PMP is that harvesting does not kill the palm tree, in contrast to the harvesting of BW. Because the mechanical properties of PMP have not been measured, we determined the shear and tensile properties of 16 samples of PMP and BW to allow a preliminary assessment of PMP as a possible material for blades. The absolute shear and tensile strengths for BW are higher, but specific properties (normalized by the density) are similar and can favour PMP. Direct substitution of BW by PMP would reduce the weight of a typical large blade by around 2%.

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Interface Rotation in Cu/Nb Accumulative Roll Bonded (ARB) Nanolaminates

SSRN

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SSRN 2022年

作者： Radchenko, Ihor Zhu, Wenxin Qing, Liu Navarro, Etienne Sahay, Rahul Lee, Pooi See Raghavan, Nagarajan Thomas, Olivier Budiman, Arief Suriadi Chen, Kai State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi’an China School of Materials Science and Engineering Nanyang Technological University Singapore639798 Singapore Nanyang Technological University Temasek Laboratories@NTU 637553 Singapore Aix Marseille Université Université de Toulon CNRS IM2NP Marseille France Xtreme Mechanics Lab 8 Somapah Road Singapore487372 Singapore Singapore487372 Singapore Department of Manufacturing and Mechanical Engineering and Technology Oregon Institute of Technology Klamath FallsOR97601 United States Industrial Engineering Department BINUS Graduate Program—Master of Industrial Engineering Bina Nusantara University Jakarta11480 Indonesia

Metal-metal nanolaminates made by accumulative roll bonding (ARB) is a developing new class of structural nanocomposites that possesses high strength, good ductility, and can also be produced in bulk. These nanolaminates exhibit strong crystallographic textures and mechanical anisotropy. Yet, their mechanical properties are often measured only along rolling direction (RD). Using in situ pillar compression, we show that in-plane shear deformation mechanism in Cu(63 nm)/Nb(63 nm) ARB nanolaminate strongly depends on the shear direction. Plastic shear along the RD abruptly changes into crystallographic rotation and later into interface shear as the shear direction deviates away from the RD. The observed shear mechanisms are driven by competition between different slip systems in Cu layers and at the interface. We expect similar deformation anisotropy to happen in other ARB nanolaminates with sharp texture and interface orientation. Comprehensive characterization of such nanolaminates may require considering more than just the usual rolling/transverse/normal direction anisotropy. © 2022, The Authors. All rights reserved.

关键词： Anisotropy

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