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Optimising degradation and mechanical performance of additively manufactured biodegradable Fe–Mn scaffolds using design strategies based on triply periodic minimal surfaces

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Smart Materials in Medicine 2024年第1期5卷 127-139页

作者： Dargusch, Matthew S. Soro, Nicolas Demir, Ali Gokhan Venezuela, Jeffrey Sun, Qiang Wang, Yuan Abdal-hay, Abdalla Alali, Aya Q. Ivanovski, Saso Previtali, Barbara Kent, Damon School of Mechanical and Mining Engineering The University of Queensland Advanced Engineering Building Bld 49 Staff House Rd St LuciaQLD4072 Australia Department of Mechanical Engineering Politecnico di Milano Via La Masa 1 Milan20156 Italy School of Dentistry The University of Queensland Herston Campus 4072 Australia Department of Engineering Materials and Mechanical Design Faculty of Engineering South Valley University Qena83523 Egypt Faculty of Industry and Energy Technology Mechatronics Technology Program New Cairo Technological University New Cairo - Fifth Settlement Cairo11835 Egypt School of Science Technology and Engineering University of the Sunshine Coast Maroochydore BCQLD4558 Australia

Additively manufactured lattices based on triply periodic minimal surfaces (TPMS) have attracted significant research interest from the medical industry due to their good mechanical and biomorphic properties. However, most studies have focussed on permanent metallic implants, while very little work has been undertaken on manufacturing biodegradable metal lattices. In this study, the mechanical properties and in vitro corrosion of selective laser melted Fe–35%Mn lattices based on gyroid, diamond and Schwarz primitive unit-cells were comprehensively evaluated to investigate the relationships between lattice type and implant performance. The gyroid-based lattices were the most readily processable scaffold design for controllable porosity and matching the CAD design. mechanical properties were influenced by lattice geometry and pore volume. The Schwarz lattices were stronger and stiffer than other designs with the 42% porosity scaffold exhibiting the highest combination of strength and ductility, while diamond and gyroid based scaffolds had lower strength and stiffness and were more plastically compliant. The corrosion behaviour was strongly influenced by porosity, and moderately influenced by geometry and geometry-porosity interaction. At 60% porosity, the diamond lattice displayed the highest degradation rate due to an inherently high surface area-to-volume ratio. The biodegradable Fe–35Mn porous scaffolds showed a good cytocompatibility to primary human osteoblasts cells. Additive manufacturing of biodegradable Fe–Mn alloys employing TPMS lattice designs is a viable approach to optimise and customise the mechanical properties and degradation response of resorbable implants toward specific clinical applications for hard tissue orthopaedic repair. © 2023 The Authors

关键词： Porosity

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Investigation on Spark Plasma Sintering of Calcareous Waste Concrete Powder and Coal Fly Ash

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Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2023年第11期70卷 451-460页

作者： Kanda, Yasuyuki Shinjo, Tomohide Mechanical Engineering Program School of Engineering Faculty of Engineering University of the Ryukyus 1 Senbaru Nishihara-cho Okinawa Nakagami-gun903-0213 Japan Solid Mechanics and Materials Engineering Graduate School of Engineering and Science University of the Ryukyus 1 Senbaru Nishihara-cho Okinawa Nakagami-gun903-0213 Japan

This paper aims to fabricate a composite material using calcareous waste concrete powder and coal fly ash (FA) by spark plasma sintering. The effect of FA addition on the mechanical properties of the composite material were investigated. The maximum FA content was 7.5 wt%. The relative density of the composite material was approximately 1.0, independent of FA content. In contrast, the Vickers hardness, flexural strength, and flexural modulus increased with increasing FA content. However, the dispersion state of FA in the composite material was not observed by scanning electron microscopy. Powder X-ray diffraction of the composite material revealed that spurrite and wollastonite were formed identically, independent of FA content. Therefore, FA serves as a reinforcement in the composite material. © 2023 Japan Society of Powder and Powder Metallurgy.

关键词： Spark plasma sintering

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Microwaved-induced co-pyrolysis of used engine lubricant and palm empty fruit bunch for alternative fuel recovery

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Carbon Resources Conversion 2025年第1期8卷 35-45页

作者： Nivasini Paramasivam Rubia Idris Chooi Wen Tan William Woei Fong Chong Guo Ren Mong Jahimin A.Asik Atikah Ali Nur Wahida Fatini Aidy Fadzlita Mohd Tamiri Siti Rahayu Mohd Hashim Cheng Tung Chong Waste-to-wealth Research Group Faculty of Science and Natural ResourcesUniversiti Malaysia SabahJalan UMS88400 Kota KinabaluSabahMalaysia School of Mechanical Engineering Faculty of EngineeringUniversiti Teknologi Malaysia81310 SkudaiJohorMalaysia Automotive Development Centre Institute for Vehicle Systems and EngineeringUniversiti Teknologi Malaysia81310 SkudaiJohorMalaysia School of Energy and Chemical Engineering Xiamen University MalaysiaJalan SunsuriaBandar Sunsuria43900 SepangSelangorMalaysia Faculty of Engineering Mechanical Engineering ProgramUniversiti Malaysia SabahJalan UMS88400 Kota KinabaluSabahMalaysia China-UK Low Carbon College Shanghai Jiao Tong UniversityLingangShanghai 201306China

Alternative fuel recovery from used engine lubricant(UEL)and empty fruit bunch(EFB)was achieved through microwave ***-pyrolysis was chosen for its potential to improve the quality of pyrolytic oil by generating synergistic effects between two distinct feedstocks,reducing activation energy,and enhancing pyrolytic oil *** central composite design(CCD)of response surface methodology(RSM)was used to optimise the temperature and EFB *** absorption spectrometry(AAS)was employed to characterise the heavy metal concentration in the pyrolytic *** optimised pyrolytic oil(UE450)produced the highest oil yield(25.17 wt%)with the lowest metal concentration at 450℃with a 50%EFB *** fuel’s characteristics were similar to those of conventional diesel,with a higher value of HHV(45.17 MJ/kg).However,the oil was slightly acidic,with a pH of ***-MS analysis of UE450 revealed the presence of alkanes and monoaromatic-rich ***,the UE450 biochar was characterised using FTIR,FESEM,and *** analysis showed that the carbonyl group(C=O)peaks at 1730 and 1440 cm^(-1)disappeared,indicating that heavy metals were bound to the biochar ***,XRF analysis of UE450 biochar revealed that zinc(Zn)exhibited a high metal adsorption capacity,following the sequence Zn>Fe>Pb(1.96,1.06,and 0.81 mmol/g).The XRF results also indicated a significant removal of SO_(3)at approximately 10.37 mmol/g.

关键词： Used engine lubricant Empty fruit bunch Co-pyrolysis Metal removal Sulphur trioxide

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Design of monitoring and control device for biogas production in a pilot scale anaerobic digester 4

Design of monitoring and control device for biogas productio...

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

作者： Daud, Muhammad Sabarullah Nurjannah, Siti Setiawan, Adi Hasibuan, Arnawan Faisal Yusuf, Edy Electrical Engineering Department Faculty of Engineering Universitas Malikussaleh Jalan Batam Kampus Bukit Indah Lhokseumawe24352 Indonesia Magister Program in Renewable Energy Engineering Faculty of Engineering Universitas Malikusssaleh Jalan Batam Bukit Indah Lhokseumawe24352 Indonesia Mechanical Engineering Department Faculty of Engineering Universitas Malikussaleh Jalan Batam Kampus Bukit Indah Lhokseumawe24352 Indonesia

Monitoring and control in the biogas production process play important role to optimize the processes occurred inside the digester and help to achieve a stable and safe process. Anaerobic digestion is a complex process involving several groups of microorganisms that are sensitive to many operating factors. Therefore, it is important to monitor and detect the process imbalances at an early stage, thus action can be taken in time to prevent the failure. The purpose of this study is to design an appropriate biodigester to produce biogas from culinary food waste and a smart-based design device which can help in monitoring and controlling the process to enhance the biogas yields and control the process of purifying biogas into biomethane. The research method in this study consists of several stages including designing the reactors and instrumentation, fabrication and installation, testing and calibration of the sensors. Performance of biodigester plants was evaluated based on data gained from the sensors. The efficiency of digesters equipped with control and monitoring instruments is better than ordinary manual digesters. Smart-based digesters can increase the rate of gas production more measurably and be recorded systematically and in real time. It can be concluded that a smart biogester equipped with a microcontroller and monitoring with Web Application can save the time and improve biogas production and safety. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Anaerobic digestion

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Building Trust in E-Commerce by Examining the Relationships Between User Experience and Delivery Satisfaction 3

Building Trust in E-Commerce by Examining the Relationships ...

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3rd International Conference on Digital Transformation and Applications, ICDXA 2024

作者： Sudirman, Ivan Diryana Sudirman, Iman Utama, Iston Dwija Binus Business School Undergraduate Program Bina Nusantara University Entrepreneurship Department Bandung Indonesia Pasundan University Faculty of Engineering Department of Mechanical Engineering Bandung Indonesia

ISBN: (纸本)9798350373424

This study analyzes the relationship across user experience, delivery satisfaction, and trust within the domain of e-commerce. The variables are assessed using Partial Least Squares (PLS) to identify their interaction. This research utilised a survey approach for collecting data from a sample of 151 participants, with the intent of interpreting their points of view. The findings suggest a significant correlation across user experience and trust in the framework of online purchase. Moreover, this study demonstrates that the satisfaction of customers with the delivery process plays a role in the creation of trust, but to a lesser extent compared to the user experience. These findings provide useful insights into the approaches that online platforms could utilize to establish and maintain the trust of their users. © 2024 IEEE.

关键词： Electronic commerce

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Developing a Floating Robot for mechanical Control of Water Hyacinth 3

Developing a Floating Robot for Mechanical Control of Water ...

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3rd International Mobile, Intelligent, and Ubiquitous Computing Conference, MIUCC 2023

作者： Elsayed, Mostafa E.A. Mohamed, Ahmed K.A. Shaaban, Mahmoud Abdelrahman, Mohamed A. Ahmed, Mohamed E. A. E. Rashed, Mostafa R. Benha University Automation and Energy Technology Lab. Shoubra Faculty of Engineering Mechanical Engineering Department Cairo Egypt Benha University Agricultural Power and Machinery Faculty of Agriculture Department of Agricultural Engineering Kalubia Egypt School of Engineering and Applied Sciences Nile University Smart Engineering Systems Center Mechanical Engineering Program Giza Egypt Benha University Combustion and Energy Technology Lab. Shoubra Faculty of Engineering Mechanical Engineering Department Cairo Egypt Benha University Shoubra Faculty of Engineering Mechanical Engineering Department Cairo Egypt University for Technology and Information Faculty of Engineering Modern Mechanical Engineering Department Cairo Egypt

ISBN: (纸本)9798350306231

Water hyacinth has become widespread in freshwater bodies in several countries, leading to various issues, particularly its substantial water consumption and the resulting need to control its growth. Among the different methods of controlling water hyacinth, mechanical control stands out as the most effective and environmentally friendly approach. A proposed harvester robot has been developed, capable of efficiently cutting and collecting water hyacinth from the water's surface. The robot boasts several advantages, including its ability to operate in narrow water paths and lakes, use clean energy sources to preserve the water ecology, employ a GPS module for safety and error detection, and generate maps for evaluating work and predicting annual growth. When compared to other technologies dealing with water hyacinth, this innovative water hyacinth harvesting robot presents a significantly lower cost of 0.01 /kg, making it an optimal solution for addressing water hyacinth problems. © 2023 IEEE.

关键词： Weed control

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Airfoil optimization for small horizontal axis wind turbine

Renewable Energy and Power Quality Journal

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Renewable Energy and Power Quality Journal 2021年 19卷 505-510页

作者： Rojas, Cristhian Leonardo Pabón Suarez, Carlos Andrés Trujillo Rico, Juan Carlos Serrano Serrano, Elkin Gregorio Flórez Mechanical Engineering Program Engineering Faculty Universidad de Antioquia Medellín Colombia Mechanical Engineering Program Faculty of Engineering and Architecture Universidad de Pamplona Pamplona Colombia

In order to take advantage of the low wind speed found in the Colombian territory, a gradient-based optimization process (GBA) of 2 airfoils is carried out, using the Xfoil software to evaluate the interactions. The shapes chosen will be destined for the root and for the middle zone of a blade for a small horizontal axis wind turbine (sHAWT). The blade will be created from the calculation of the chord and pitch angle with the blade element momentum methodology (BEM) and the SHAWT will be tested by CFD software to check its performance. As a preliminary result, a root-bound airfoil has been obtained with a higher performance than the airfoil used as a bases. © 2021, European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ). All rights reserved.

关键词： Airfoils

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Resistance of Modified Concrete-Wearing Course Mixture Using LDPE Polymer Against Damage Due to Water Immersion 2nd

Resistance of Modified Concrete-Wearing Course Mixture Using...

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2nd International Conference of Construction, Infrastructure, and Materials, ICCIM 2021

作者： Handayasari, Indah Kusumastuti, Dyah Pratiwi Chairat, Arief Suardi Nur Study Program of Civil Engineering Institut Teknologi PLN West Jakarta Indonesia Study Program of Mechanical Engineering Institut Teknologi PLN West Jakarta Indonesia

ISBN: (纸本)9789811679483

Damage that occurs on the pavement can be in the form of permanent deformation, cracks due to temperature changes, material damage and material detachment. This research tested the resistance of the Asphalt Concrete Wearing Course (AC-WC) mixture using a plastic bag of LDPE (Low Density Polyethylene) polymer type against water through immersion in water with a temperature of 60 ℃ for 30 min, 24, 48 and 72 h with a continuous system and variations in LDPE polymer plastic content. by 0, 5, 7 and 9%. The results of the analysis show that the use of LDPE polymer plastic in the AC-WC mixture can increase the resistance to damage to the mixture due to continuous water immersion by reducing the retained strength index value and increasing the remaining strength index value with increasing the duration of immersion. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Mixtures

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Developing Organizational Resilience Model to Sustain Business Performance

Developing Organizational Resilience Model to Sustain Busine...

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2022 IEEE International Conference on Industrial engineering and engineering Management, IEEM 2022

作者： Jonny Mangindaan, Dave Faculty of Engineering Bina Nusantara University Professional Engineer Study Program Industrial Engineering Department Jakarta Indonesia Bina Nusantara University Professional Engineer Study Program Faculty of Engineering Jakarta Indonesia

ISBN: (数字)9781665486873

ISBN: (纸本)9781665486873

Organizational resilience is about combination of operational and strategic resilience to sustain company's performance. In the time of turbulence like COVID-19 pandemic era, this resilience is extremely needed for any organizations not only to bounce back from its disruption but also ensures its sustained performance. However, knowledge related to this ability is still lacking and developing to cover especially factors needed to develop resilience for organization. Thus, this paper is proposing an organizational resilience model that covers what factors known so far. For this research, 100 organizations were invited for the research using questionnaires as its instrument. Among these invited organizations, only 47 organizations have given their responses at rate of 47%. Partial Least Square Structural Equation Modeling (PLS-SEM) method using SmartPLS 3.0 was utilized for data processing. This confirms that organization should promote its resilience through operational dan strategic resilience to sustain its performance especially in times of turbulence especially during COVID-19 pandemic era. © 2022 IEEE.

关键词： COVID-19

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Combustion Test of Densified Arabica Coffee Pulp Biochar in a Purposely Built Chamber 4th

Combustion Test of Densified Arabica Coffee Pulp Biochar in ...

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4th International Conference on Experimental and Computational Mechanics in engineering, ICECME 2022

作者： Nurjannah, Siti Andika, Yoandra Setiawan, Adi Faisal, Faisal Muhammad, Muhammad Hakim, Lukman Magister Program in Renewable Engineering Faculty of Engineering Universitas Malikussaleh Bukit Indah Lhokseumawe24352 Indonesia Mechanical Engineering Departement Faculty of Engineering Universitas Malikussaleh Jalan Batam Bukit Indah Muara Satu Lhokseumawe24352 Indonesia Chemical Engineering Departement Faculty of Engineering Universitas Malikussaleh Jalan Batam Bukit Indah Muara Satu Lhokseumawe24352 Indonesia

ISBN: (纸本)9789819974948

The study of solid fuel combustion characteristics is still continuing due to increases in demand of clean and renewable source of energy. Agricultural waste such as coffee pulp is an alternative source of biomass which has not optimally been utilized. The aim of this study is to examine the characteristics of the solid fuel combustion of densified coffee pulp biochar in a purposely built furnace. Initially, a simple mechanical design of combustion test furnace was prepared equipped with data logger for measuring weight lost and temperature changes. As main testing fuel, arabica coffee pulp was pyrolyzed and densified by adding starch binder. For comparison, locally available commercial coconut briquette and young brown coal were also tested under similar condition. The weight of each fuel sample was ≤ 50 g. Based on combustion test results, required time for ignition of coffee pulp and coconut briquettes was 2 min, and it took 5 min for coal. The combustion rate of densified coffee pulp biochar, coconut briquette, and coal was 0.5 g/min, 0.59 g/min, and 0.23 g/min, respectively. The maximum combustion temperature of 480 °C at 35 min, 375.9 °C at 45 min, and 487 °C coal at 140 min was observed during the combustion test of densified coffee pulp biochar, coconut briquette, and coal, respectively. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Lignite

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