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Microstructural Analysis of blended Guinea-Corn Stalk and Saw-Dust Ash for Cement Mixture of Interlocking Concrete Block

Microstructural Analysis of blended Guinea-Corn Stalk and Sa...

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2024 International Conference on Science, engineering and Business for Driving Sustainable Development Goals, SEB4SDG 2024

作者： Adetola, Sunday Oyejide, Ayodele Emmanuel, Elijah Adejinle, Segun Aiyegbabe, Johnson Ladoke Akintola University of Technology Department of Mechanical Engineering Oyo Nigeria Afe Babalola University Department of Biomedical Engineering Ado-Ekiti Nigeria

ISBN: (纸本)9798350358155

The utilization of interlocking concrete blocks in sustainable construction has garnered considerable attention owing to their intrinsic benefits, which comprise decreased mortar requirements, improved stability, and simplicity of assembly. This study investigates the influence of incorporating agricultural waste materials, specifically Guinea-Corn Stalk (GCS) and saw dust, on the microstructural properties of interlocking concrete blocks. The recovered GCS and sawdust wastes were calcinated and the ashes were mixed with ordinary plotland cement (OPC) and grounded granite particles in the proportion of 5, 10, 15, 20 and 25 wt.% to create a blended cement solid sample. The samples were then cured for 28 days, after with Energy-dispersive X-ray spectroscopy (EDS) and Scanning Electron Microscope (SEM) analysis, a lower and higher magnifications of 26,0000x and 30000x, respectively were then analyzed. The results suggest that the addition of guinea-corn stalk ash (GCSA) and sawdust ash (SDA) with cement in relatively low proportion retains good calcium content in the cement, while higher proportion decreases the calcium composition, which could implicate heavy constructions. © 2024 IEEE.

关键词： Energy dispersive spectroscopy

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Manufacturing process design for cellular structure used as impact energy absorbers 4

Manufacturing process design for cellular structure used as ...

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4th International Symposium on Advances and Innovation in mechanical engineering, ISAIME 2023

作者： Komara, Asep Indra Setiawan, Rachman Budiwantoro, Bagus Doctoral Program of Mechanical Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Bandung Indonesia Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Bandung Indonesia Manufacturing Design Engineering Department Politeknik Manufaktur Bandung Bandung Indonesia

The application of passive safety technology in vehicles is generally through impact-absorbing structures. This technology has been widely applied to trains, planes, and cars to protect passengers from fatal accidents. Cellular structures are defined by a unit cell that combines material, space, and unit cell repetition to obtain a large structure. It is selected as the base structure of the impact energy absorber for its potentially high specific energy absorption (SEA]. Such a structure poses a challenge in its manufacturing method. This study examines alternative manufacturing processes for cellular structures designed as impact absorbers, and then selects and develops an effective and efficient manufacturing method to produce these cellular structures. Several alternative manufacturing methods were chosen to exercise the use of a combined plaster molding technology and additive manufacturing for prototyping. Manufacturing process simulation studies were conducted using Altair Inspire Cast software to determine the success of the casting process. The final stage is to carry out the process of making cell structures and evaluating the results. This work results in an effective manufacturing process design to be implemented throughout the production stage. Furthermore, for mass production, mold patterns may be replaced by using injection molding. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Injection molding

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Fusion and Validation Method for Laser Interstitial Thermal Therapy Simulation Model and MRI 46

Fusion and Validation Method for Laser Interstitial Thermal ...

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46th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBC 2024

作者： Xu, Daiyao Wang, Guangzhi Concordia University Department of Mechanical Industrial & Aerospace Engineering Montreal Canada Tsinghua University School of Medicine Department of Biomedical Engineering Beijng China

ISBN: (纸本)9798350371499

In this paper, we present a simulation program based on Monte Carlo simulation and bio-heat transfer models for laser interstitial thermal therapy (LITT). Additionally, we present a data fusion strategy that synchronizes MRI data with simulation results. The simulation model's validity was checked and proven by using this method to combine simulation calculations with MRI-measured temperature data from cases of brain lesions. For LITT treatment planning, the alignment fusion method and higher temporal-spatial resolution simulation model developed in this paper provide a clear three-dimensional visualization of the ablation temperature field displayed in situ on MRI images. This enables the preoperative planning of LITT to be conducted efficiently. © 2024 IEEE.

关键词： Magnetic resonance imaging

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Micro-camera Arrays for Ultra-widefield, Multi-site Cellular Resolution Calcium Imaging Across the Dorsal Cortex of Behaving Mice

Micro-camera Arrays for Ultra-widefield, Multi-site Cellular...

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Optics and the Brain, BRAIN 2024 - Part of Optica Biophotonics Congress: biomedical Optics

作者： Cherkkil, Arun Hu, Jia Oladepo, Ibrahim Fausner, Skylar Surinach, Daniel Peters, Ryan Saxena, Kapil Horstmeyer, Roarke Kodandaramaiah, Suhasa B. Department of Mechanical Engineering University of Minnesota MinneapolisMN United States Department of Biomedical Engineering Duke University DurhamNC United States

Here, we introduce a miniaturized multi camera microscope that can simultaneously capture cellular resolution neural activity from multiple large fields of view of the cortex in a freely moving mouse. © 2024 The ... 详细信息

ISBN: (纸本)9781957171340

关键词： Mammals

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Study on Robot Grasping System of SSVEP-BCI Based on Augmented Reality Stimulus

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Tsinghua Science and Technology 2023年第2期28卷 322-329页

作者： Shangen Zhang Yuanfang Chen Lijian Zhang Xiaorong Gao Xiaogang Chen School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China Beijing Institute of Mechanical Equipment Beijing 100854China Department of Biomedical Engineering School of MedicineTsinghua UniversityBeijing100084China Institute of Biomedical Engineering Chinese Academy of Medical Sciences and Peking Union Medical CollegeTianjin 300192China

Although notable progress has been made in the study of Steady-State Visual Evoked Potential(SSVEP)-based Brain-Computer Interface(BCI),several factors that limit the practical applications of BCIs still *** of these factors is the importability of the *** this study,Augmented Reality(AR)technology was introduced to present the visual stimuli of SSVEP-BCI,while the robot grasping experiment was designed to verify the applicability of the AR-BCI *** offline experiment was designed to determine the best stimulus time,while the online experiment was used to complete the robot grasping *** offline experiment revealed that better information transfer rate performance could be achieved when the stimulation time is 2 *** of the online experiment indicate that all 12 subjects could control the robot to complete the robot grasping task,which indicates the applicability of the AR-SSVEP-humanoid robot(NAO)*** study verified the reliability of the AR-BCI system and indicated the applicability of the AR-SSVEP-NAO system in robot grasping tasks.

关键词： Steady-State Visual Evoked Potential(SSVEP) Brain-Computer Interface(BCI) Augmented Reality(AR) robot grasping system

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A holistic perspective of the sustainable manufacturing: a novel conceptual approach

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International Journal of Industrial and Systems engineering 2022年第2期41卷 135-167页

作者： Garbie, Ibrahim Garbie, Abdelrahman Industrial Engineering Program Department of Mechanical Engineering Helwan University Cairo Helwan Egypt Department of Mechanical Engineering University of Louisiana at Lafayette LafayetteLA United States

Sustainability is recently considered the buzzword in manufacturing environments. Analysis and investigation of sustainability in manufacturing becomes urgent not only from one stream but also from the whole manufacturing streams. The main goal of this paper is to explain how to classify sustainability in all streams of manufacturing as a whole (machine components design, manufacturing processes and manufacturing systems) through identifying the sustainability enablers. A framework to analyse the whole manufacturing streams will be illustrated and discussed to identify which enablers are significant in each manufacturing stream and which manufacturing stream is more significant towards whole manufacturing sustainability than others. A novel assessment for measuring the manufacturing sustainability will be presented. It seemed that the stream of the manufacturing system represented the highest turbulent one due to the diversity and numerous sustainable enablers. It was also observed from this analysis and investigation that understanding sustainable manufacturing as a whole is a comprehensive task and it is recommended as one of major pillars towards the Industry 4.0. © 2022 Inderscience Enterprises Ltd.

关键词： Machine design

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Autonomous Conflict Resolution in Urban Air Mobility: A DeeMulti-Agent Reinforcement Learning Approach

Autonomous Conflict Resolution in Urban Air Mobility: A DeeM...

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AIAA Aviation Forum and ASCEND, 2024

作者： Deniz Sdeniz@Vols.Utk.Edu, Sabrullah Wang, Zhenbo The University of Tennessee Department of Mechanical Aerospace and Biomedical Engineering KnoxvilleTN37996 United States

ISBN: (纸本)9781624107160

As urban air mobility (UAM) expands, electric vertical take-off and landing (eVTOL) vehicles are becoming increasingly prevalent, leading to new challenges in air traffic control. Specifically, managing eVTOL traffic at intersections and merging scenarios in low-altitude airspace becomes a safety-critical, real-time decision-making task due to the highly dynamic and stochastic nature of the environment. To address this challenge, we propose a deep multi-agent reinforcement learning framework specifically adapted to the complexities of eVTOL navigation in three-dimensional space. This framework employs asynchronous advantage actor critic (A3C), an actor-critic model, which is optimized to address the complexities of eVTOL navigation within three-dimensional space. We employ a centralized learning, decentralized execution strategy, utilizing a shared neural network across all agents in the environment. We validate the scalability and efficiency of our proposed framework in managing large-scale, high-density eVTOL traffic, ensuring safe separation and conflict resolution at intersections and merging points. Our model is extensively simulated in a suitable environment that accurately represents the physical dynamics of real-world environment. Preliminary results demonstrate the effectiveness of our framework in resolving nearly all conflicts in high-density traffic scenarios, promising a feasible solution for autonomous air traffic control in the rapidly developing UAM landscape. © 2024, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Stochastic systems

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Imaging Measurements of Surface Heat Flux from Shock-Boundary Layer Interaction in Low Enthalpy Mach 4 Flow

Imaging Measurements of Surface Heat Flux from Shock-Boundar...

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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Smith, Cary Dean Gragston, Mark Edwards, Sophia Webber, Nicholas Mechanical Aerospace and Biomedical Engineering Department University of Tennessee Space Institute TullahomaTN United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Time-resolved surface area thermal measurements on a hollow cylinder model with a protruding shock-generating cylinder have been performed in a very low enthalpy Mach 4 Ludwieg Tube wind tunnel using infrared thermography and temperature sensitive paint. The tunnel’s total temperature equivalence to the surroundings and short flow duration result in minimal heat transfer, but both techniques were demonstrated to have enough sensitivity to measure low temperature gradients and detect thermal signatures of shock-boundary layer interaction. Temperature gradients as low as © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Enthalpy

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An experimental investigation of forced convective liquid immersion cooling of a 12-cell li-ion battery module 9

An experimental investigation of forced convective liquid im...

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9th European Thermal Sciences Conference, EUROTHERM 2024

作者： Salter, D.W. Bachelier, G. Kumavat, P.S. Trimble, D. O'Shaughnessy, S.M. Department of Mechanical Manufacturing & Biomedical Engineering The University of Dublin Trinity College Parsons Building Ireland

This study details an experimental investigation of forced convective liquid immersion cooling of lithium-ion batteries. Twelve Samsung INR 18650 20S cylindrical cells, each with a nominal voltage of 4.2 V and nominal capacity of 2 Ah, are placed in a 4-in-series, 3-in-parallel arrangement inside a polycarbonate chamber. The cells are immersed in the dielectric fluid SF-33 and are discharged at C rates in the range of 1C to 4C. Temperature sensors placed along the body of each cell near the electrodes monitor their thermal behaviour during experiments. Results show that liquid immersion cooling is an effective method to maintain all cell temperatures within the desired temperature range of 15°C to 35°C for all cases tested, maintaining temperature differences within individual cells to ≤1.5°C, and those between cells to ≤3°C. This research contributes to the understanding of thermal management strategies for lithium-ion batteries, particularly in scenarios involving high discharge rate applications. © Published under licence by IOP Publishing Ltd.

关键词： Lithium-ion batteries

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mechanical behavior and semiempirical force model of aerospace aluminum alloy milling using nano biological lubricant

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Frontiers of mechanical engineering 2023年第1期18卷 55-69页

作者： Zhenjing DUAN Changhe LI Yanbin ZHANG Min YANG Teng GAO Xin LIU Runze LI Zafar SAID Sujan DEBNATH Shubham SHARMA School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China School of Mechanical Engineering Dalian University of TechnologyDalian 116024China State Key Laboratory of Ultra-precision Machining Technology Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Department of Biomedical Engineering University of Southern CaliforniaLos AngelesCA 90089-1111USA College of Engineering University of SharjahSharjah 27272United Arab Emirates Mechanical Engineering Department Curtin UniversityMiri 98009Malaysia Department of Mechanical Engineering IK Gujral Punjab Technical UniversityPunjab 144603India

Aerospace aluminum alloy is the most used structural material for rockets,aircraft,spacecraft,and space *** deterioration of surface integrity of dry machining and the insufficient heat transfer capacity of minimal quantity lubrication have become the bottleneck of lubrication and heat dissipation of aerospace aluminum ***,the excellent thermal conductivity and tribological properties of nanofluids are expected to fill this *** traditional milling force models are mainly based on empirical models and finite element simulations,which are insufficient to guide industrial *** this study,the milling force of the integral end milling cutter is deduced by force analysis of the milling cutter element and numerical *** instantaneous milling force model of the integral end milling cutter is established under the condition of dry and nanofluid minimal quantity lubrication(NMQL)based on the dual mechanism of the shear effect on the rake face of the milling cutter and the plow cutting effect on the flank surface.A single factor experiment is designed to introduce NMQL and the milling feed factor into the instantaneous milling force *** average absolute errors in the prediction of milling forces for the NMQL are 13.3%,2.3%,and 7.6%in the x-,y-,and z-direction,*** with the milling forces obtained by dry milling,those by NMQL decrease by 21.4%,17.7%,and 18.5%in the x-,y-,and z-direction,respectively.

关键词： milling force nanofluid minimum quantity lubrication aerospace aluminum alloy nano biological lubricant

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