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Improving the functional stability of TiNi-based shape memory alloy by multi-principal element design

materials science and engineering: A 2023年 872卷

作者： Lu, Nian-Hu Chen, Chih-Hsuan Dept. of Mechanical Engineering National Taiwan University Taipei106 Taiwan Dept. of Materials Science and Engineering National Taiwan University Taipei106 Taiwan

This study investigated the evolutions of the superelasticity and elastocaloric effect of a multi-principal element Ti40Zr10Ni40Co5Cu5 strain glass alloy during 3001 cyclic compressions. The results were compared with a conventional solution-treated Ti49Ni51 shape memory alloy. The Ti40Zr10Ni40Co5Cu5 strain glass alloy exhibited a higher hardness, lower residual strain, and lower dislocation density due to multi-principal element solid solution strengthening and strong lattice distortion. Furthermore, it showed stable critical stress and elastocaloric cooling temperature drop during the cyclic test, and the values were maintained at 90.9 and 83.3 % after 3001 cycles, respectively. Digital image correlation analyses showed that the Ti40Zr10Ni40Co5Cu5 strain glass alloy exhibited a more homogeneous martensitic transformation behavior instead of the localized Lüders-type one. This feature originated from the high density of atomic defects, which in turn improved the temperature uniformity of the material during elastocaloric cooling. Experimental results demonstrated that the multi-principal element design method effectively suppressed dislocation slip and thus improved the functional stability and transformation homogeneity of the shape memory alloy, so such alloys are potential candidates for solid-state refrigerants. © 2023 Elsevier B.V.

关键词： Titanium alloys

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Influence of porosity to dynamic Young's modulus of sintered iron. Bayesian approach

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materials Today: Proceedings 2022年 59卷 1677-1682页

作者： Dimitrov, Diayn M. Mincheva, Desislava Slavov, Stoyan D. Dept. Mechanics and Machine Elements Technical University of Varna ul. Studentska 1 Varna 9010 Bulgaria Dept. Materials Science and Technology Technical University of Varna ul. Studentska 1 Varna 9010 Bulgaria Dept. Mechanical Engineering and Machine Tools Technical University of Varna ul. Studentska 1 Varna 9010 Bulgaria

In this paper Young's modulus against porosity relation E/Eo = f(P) for sintered Fe and steel powder compacts is discussed. For the experiment beam like (5 × 10 × 50 mm3) compacts, in density range 6.6–7.0 g/cm3 (P = 0.12–0.09), prepared from Fe powder (ASC100.29) are sintered in industrial conditions. Elastic constants E, G, ν are calculated from experimentally obtained fundamental mode shape frequencies, specimen mass and dimensions, using impulse excitation technique (IET). To ensure free beam boundary conditions, supports are placed in mode shapes nodal points. Popular model equation is fitted to experimental data. A Bayesian approach is used for parameter estimation. Fitted model equation predicts reasonably well the data from our and another researchers experiments with pre-alloyed Fe-Cr-Mo powder compacts, but fails for sintered steels prepared from powder mixtures and diffusion alloyed powders with Cu additions. © 2022

关键词： Porosity

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Surface Roughness Measurement of Functionalized CVD Graphene and Hexagonal Boron Nitride Heterostructures Using Atomic Force Microscopy

Surface Roughness Measurement of Functionalized CVD Graphene...

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IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS)

作者： Evans Addo-Mensah Ashby Philip John Katlin Reynolds Fernando Maia De Oliveira Hugh Churchill Uchechukwu Wejinya Dept. Materials Science and Engineering University of Arkansas Fayetteville USA Dept. Physics University of Arkansas Fayetteville USA Physics University of Arkansas Fayetteville USA Dept. Institute for Nanoscience and Engineering University of Arkansas Fayetteville USA Dept. Mechanical Engineering University of Arkansas Fayetteville USA

ISBN: (数字)9798350359831

ISBN: (纸本)9798350359848

Graphene has been a focal point of research since its discovery, owing to its diverse and outstanding mechanical and electrical properties. These properties make graphene a promising candidate for various applications, particularly in developing diverse microelectronic devices. In this work, the functionalization of the CVD graphene with higher concentrations of Sodium Octyl Sulfate (SOS) surfactant and longer treatment times led to the delamination of the CVD graphene. However, lower concentrations of 0.125% wt./vol and 0.25% wt./vol prevented delamination which ensured the preservation of the graphene structure, but they also caused an increase in surface roughness. The increase in surface roughness has been identified as a factor that could affect the mobility of carriers in graphene, and this is a key aspect of our current focus in this paper. It is crucial to understand how this rise in roughness influences the movement of carriers in graphene.

关键词： Atomic measurements Sodium Graphene Scattering Surface roughness Time measurement Rough surfaces

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In silico drug delivery modeling of a novel Everolimus Coated Balloon 46

In silico drug delivery modeling of a novel Everolimus Coate...

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

作者： Kotoulas, Grigorios G. Loukas, Vasileios S. Karanasiou, Georgia S. Sakellarios, Antonis I. Pezoulas, Vasileios C. Katsouras, Christos C. Michalis, Lambros K. Semertzioglou, Arsen Moulas, Anargyros Geris, Liesbet Fotiadis, Dimitrios I. University of Patras Laboratory of Biomechanics and Biomedical Engineering Department of Mechanical and Aeronautics Engineering Patras Greece University of Ioannina Medical School Dept. of Cardiology GR Ioannina Greece Rontis Corporation S.A Larisa Greece University of Thessaly General Department Larisa Greece University of Liège Ku Leuven Department of Biomechanics and Computational Tissue Engineering Belgium University of Ioannina Unit of Medical Technology and Intelligent Information Systems Dept. of Materials Science and Engineering Ioannina Greece Biomedical Research Institute Foundation for Research and Technology Hellas FORTH-BRI Ioannina Greece

ISBN: (纸本)9798350371499

This study examines the drug elution process of a novel Everolimus Coated Balloon (ECB) that features a novel polymer mixture consisting of cellulose derivatives and accelerators, and Everolimus as the pharmaceutical component, based on commercially available PTCA balloon-catheter system. In this analysis, we utilized in silico postdeployment results comprising three distinct datasets of healthy porcine arteries undergoing PTCA with (a) Sirolimus, (b) Low-dose Everolimus, and (c) High-dose Everolimus. We developed a computational model that consists of the drug release from the balloon surface and the drug transport through the porous arterial wall given advection and diffusion properties. The comparative results of the current study highlight that: (a) among the high and low-dose Everolimus Eluting Balloons, diffusivity is the governing property and as such, respective amount of drug is eluted and bound by the arterial wall - effectively rendering the high-dose balloon powerful in its delivery properties, and (b) based on the diffusivity of Everolimus and Sirolimus, the Everolimus Eluting Balloons exhibit superior performance with respect to total bound drug of the arterial *** Relevance - The approach described in this article is a step farther toward precision drug release from DCB prediction. Furthermore, our study's findings demonstrate that higher drug concentration in the coating leads to higher binding amounts;this information could be utilized to inform the creation of novel Drug Coated Balloon (DCB). © 2024 IEEE.

关键词： Balloons

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Biogas Production Potential of Anfcmbr Treating Concentrated Municipal Wastewater at Room Temperature and 24 H Hrt

SSRN

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SSRN 2023年

作者： Ozcan, Ozlem Sahinkaya, Erkan Uzal, Nigmet Dept. of Materials Science and Mechanical Engineering Abdullah Gul University Turkey Dept. of Bioengineering Istanbul Medeniyet University Turkey Dept. of Civil Engineering Abdullah Gul University Turkey

Anaerobic fluidized-bed ceramic membrane bioreactor (AnFCMBR) has become a more promising process for municipal wastewater treatment than traditional aerobic treatment processes. The significant proportion of the biomass in AnFCMBR reduces its contact with the membrane and enables management of fouling, which is the main drawback of membrane processes. In this study, the performance of AnFCMBR process was evaluated using up-concentrated municipal wastewater for maximizing the methane production for 2 months at 25±3°C and 24-hour HRT. The AnFCMBR achieved an average chemical oxygen demand (COD) removal of 89–96%. When the entire methane production efficiency is evaluated by taking into account the dissolved methane in the permeate samples, the AnFCMBR process has an energy production potential of 0.10 kWh/m3. AnFCMBR has a significant potential to perform the energy-self-sufficient treatment of municipal wastewater following pre-concentration process. © 2023, The Authors. All rights reserved.

关键词： Bioreactors

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A GLIMPSE AT FIFTY-ONE YEARS IN ACOUSTIC EMISSION

e-Journal of Nondestructive Testing

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e-Journal of Nondestructive Testing 2023年第1期28卷

作者： Hamstad, Marvin A. University of Denver Daniel Felix Ritchie School of Engineering and Computer Science Dept. of Mechanical and Materials Engineering DenverCO United States

After 51 years continuously involved in acoustic emission (AE) testing and research, it has been interesting to look back over five decades. The equipment available in the early 1970s was primitive compared to now. At the start of that decade, only one, recently established, commercial company sold AE measurement equipment, and other useful equipment was internally built or adapted from other technologies. Further, the data that came from an AE monitored test was simply the number (counts) of penetrations of a fixed one-volt threshold expressed as an increasing total or a rate and recorded on an x-y plotter. The purpose of this "glimpse" is to present advances both within the author’s research as well as those that were adopted from others research that were viewed as moving AE technology forward. This "glimpse" is not intended to be comprehensive, instead it is limited to aspects the author was involved in. Among the topics to be covered are advances such as understanding hydraulic test machine continuous noise, true root-mean-square (RMS) voltage measurements, inclusion particle fracture or decohesion, tension versus compression testing for unflawed metal samples, the pencil lead break, an acoustic emission signal simulator, broadband sensors, digital waveform recorders, large transverse-dimensioned plates, absolutely calibrated flat-with-frequency AE sensors, finite element modeling (FEM) in isotropic materials, validation of FEM, computer-based digital AE systems, intensity of frequency versus time of AE signals, superposition of group velocity results and FEM beyond the case of dipoles in an isotropic plate. © 2023 The Authors.

关键词： Acoustic emission testing

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Vibration Energy Harvesting: A Review on Trends, Challenges & Future Direction

Vibration Energy Harvesting: A Review on Trends, Challenges ...

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IEEE International Conference on Emerging & Sustainable Technologies for Power & ICT in a Developing Society (NIGERCON)

作者： Sunday A. Afolalu Temitayo S. Ogedengbe Moses E. Emetere Stella I. Monye Monye N. Snow Dept. of Mechanical and Mechatronics Engineering Department Afe Babalola University Ado-Ekiti Nigeria Dept. of Mechanical Science University Johannesburg South Africa Dept. of Mechanical Engineering Department Nile University of Nigeria Abuja Dept. of Physics Program Bowen University Iwo Osun State Nigeria Dept. of Information Communication Technology University of Delta Agbor Delta State Nigeria

ISBN: (数字)9798331542559

ISBN: (纸本)9798331542566

The worldwide need for sustainable energy solutions has continued to attract the attention of researchers. One vital means for such provision is the harvesting of energy using various methods. This study therefore reviews the recent trends in energy harvesting. Methods such as vibration energy harvesting as well as electrostatic energy harvesting and their applications have been thoroughly discussed. The study also reviewed the challenges with this energy harvesting methods and finally concludes with the future directions of this topic. It is believed that the generation of energy if greatly boosted will drive the economy of any state and ultimately result in wealth generation for the economy.

关键词： Vibrations Humanities Electric potential Reviews Developing countries Market research Energy harvesting Electrostatics

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Vibration Energy Harvesting: A Review on Trends, Challenges & Future Direction 5

Vibration Energy Harvesting: A Review on Trends, Challenges ...

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5th IEEE International Conference on Electro-Computing Technologies for Humanity, NIGERCON 2024

作者： Afolalu, Sunday A. Ogedengbe, Temitayo S. Emetere, Moses E. Monye, Stella I. Snow, Monye N. Afe Babalola University Dept. of Mechanical and Mechatronics Engineering Ado-Ekiti Nigeria University Johannesburg Dept. of Mechanical Science South Africa Nile University of Nigeria Dept. of Mechanical Engineering Department Abuja Nigeria Bowen University Dept. of Physics Program Osun State Iwo Nigeria University of Delta Dept. of Information Communication Technology Delta State Agbor Nigeria

ISBN: (纸本)9798331542559

关键词： Energy Generation Harvesting Power Vibration

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Hydrogen Powered Fuel Cell Systems - A Review

Hydrogen Powered Fuel Cell Systems - A Review

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IEEE International Conference on Emerging & Sustainable Technologies for Power & ICT in a Developing Society (NIGERCON)

作者： Sunday A. Afolalu Temitayo S. Ogedengbe Moses E. Emetere Stella I. Monye Monye N. Snow Dept. of Mechanical and Mechatronics Engineering Department Afe Babalola University Ado-Ekiti Nigeria Dept. of Mechanical Science University Johannesburg South Africa Dept. of Mechanical Engineering Department Nile University of Nigeria Abuja Dept. of Physics Program. Bowen University Iwo Osun State Nigeria Dept. of Information Communication Technology University of Delta Agbor Delta State Nigeria

ISBN: (数字)9798331542559

ISBN: (纸本)9798331542566

The urgent need for sustainable energy sources has fuelled research into alternative power generation technologies. Among these, hydrogen fuel cells have emerged as promising candidates due to their high energy efficiency and zero-emission profile. This study presents a review on hydrogen energy and fuel cell. The design principles for fuel cells, hydrogen production methods, hydrogen storage technologies and the integration of fuel cells into power systems have been discussed. The review concludes with a discussion on technological advances in fuel cell materials and environmental impacts/sustainability of hydrogen fuel cells.

关键词： Renewable energy sources Humanities Hydrogen storage Reviews Hydrogen Fuel cells Production Power systems Sustainable development Power generation

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Biodiesel Production Techniques and Merits: An Overview

Biodiesel Production Techniques and Merits: An Overview

引用

IEEE International Conference on Emerging & Sustainable Technologies for Power & ICT in a Developing Society (NIGERCON)

作者： Stella I. Monye Sunday A. Afolalu Moses E. Emetere Temitayo S. Ogedengbe Monye N. Snow Dept. of Mechanical and Mechatronics Engineering Department Afe Babalola University Ado-Ekiti Nigeria Dept. of Mechanical Science University Johannesburg South Africa Dept. of Physics Program Bowen University Iwo Osun State Nigeria Dept. of Mechanical Engineering Department Nile University of Nigeria Abuja Dept. of Information Communication Technology University of Delta Agbor Delta State Nigeria

ISBN: (数字)9798331542559

ISBN: (纸本)9798331542566

Biodiesel is gaining popularity due to its environmental benefits and renewable nature. Biomass has the potential to replace fossil fuels that release carbon dioxide into the atmosphere, it might as well make a significant contribution to reducing the greenhouse effect. It has, nevertheless, some setbacks including its demanding land and water use, the risk of losing arable lands to it and the impact of cutting and processing biofuel products. This study therefore reviews the production techniques and merits associated with biodiesel. This review projects the production and use of high-quality biodiesel, thereby paving the way for a more sustainable transportation future with reduced reliance on fossil fuels.

关键词： Heating systems Humanities Costs Reviews Greenhouse effect Transportation Production Carbon dioxide Fossil fuels Biofuels

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