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Corrosion Inhibition Efficiency of Biosynthesized Silver Nanoparticles Using Citrus aurantium Peels Extract

Journal of Bio- and Tribo-Corrosion 2024年第3期10卷 1-24页

作者： Hamze, Zeina K. Faraj, Marwa Mhanna, Rami Younes, Ghassan El-Dakdouki, Mohammad H. Department of Chemistry Faculty of Science Beirut Arab University Riad El Solh Beirut11072809 Lebanon Biomedical Engineering Program Maroun Semaan Faculty of Engineering and Architecture American University of Beirut Beirut1107 2020 Lebanon

Corrosion is a detrimental persistent industrial conundrum that can cause the failure of operating equipment and weakening of construction assemblies, thus threatening the lives of humans, and accelerating the consumption of the natural metals reservoirs. In this study, we deployed green silver nanoparticles (AgNPs) as corrosion inhibitors for mild steel. Citrus aurantium peels aqueous extract (CAPE) mediated the bio-reduction of silver ions (Ag+) into silver nanoparticles (AgNPs) under optimized experimental conditions. The prepared nanoparticles were comprehensively characterized by various techniques for size, morphology, optical properties, crystallinity, and elemental composition. Phytochemical analysis showed that the plant extract is rich in phenolic compounds that facilitated the formation of metallic silver from Ag+ ions. The anticorrosion properties of CAPE and CAPE-AgNPs for mild steel in 0.5 M HCl were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The biosynthesized CAPE-AgNPs were more efficient than CAPE in slowing down corrosion with inhibition efficiency of 70% attained at 1000 ppm of the inhibitor. CAPE and CAPE-AgNPs acted as mixed-type corrosion inhibitors with dominance over the cathodic reaction. Fitting the experimental data into different isotherms demonstrated that the corrosion inhibition was an endothermic process that took place through physical adsorption. CAPE-AgNPs significantly reduced pitting and localized damage on the metal surface. These findings highlighted the utility of CAPE-AgNPs as efficient corrosion inhibitors in different industrial settings. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Silver nanoparticles

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Boosted urea electrooxidation activity by dynamic steady blending CoOOH-Ni(OH)2 nanoclusters for H2 production in a pH-asymmetric electrolyzer

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Journal of Materials Chemistry A 2024年第36期12卷 24126-24135页

作者： Peng, Shih-Mao Chang, Shu-Ting Chang, Chia-Che Hn, Priyadarshini Chang, Chun-Chih Wu, Kuan-Chang Huang, Yung-Hung Chen, Yi-Chia Kuo, Tsung-Rong Pao, Chih-Wen Chen, Jeng-Lung Wang, Di-Yan Graduate Institute of Biomedical Materials & Tissue Engineering Taipei Medical University Taipei11031 Taiwan Department of Chemistry Tunghai University Taichung40704 Taiwan Hsinchu30076 Taiwan Department of Chemical and Materials Engineering Chinese Culture University Taipei11114 Taiwan Department of Chemistry National Taiwan Normal University Taipei11677 Taiwan Graduate Institute of Nanomedicine and Medical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan

Electrochemical urea oxidation reaction (UOR) is a promising alternative to the oxygen evolution reaction for reducing the overall potential of the hydrogen evolution reaction during water electrolysis. The theoretical potential for the UOR is only 0.37 V versus reversible hydrogen electrode (RHE). However, the kinetics of the six-electron transfer process involved in the UOR are inherently sluggish, resulting in high overpotential during the reaction. This study designed an active catalyst with a lower kinetic barrier in the UOR by fabricating blending CoOOH-Ni(OH)2 nanoclusters through the structural transformation of amorphous Co-Ni hydroxide films. This structural transformation was investigated using high-angle annular dark-field scanning transmission electron microscopy, corresponding energy-dispersive X-ray spectroscopy, and in situ X-ray absorption spectra. The blending CoOOH-Ni(OH)2 nanoclusters exhibited superior electrocatalytic activity in the UOR in an alkaline environment, achieving a low onset potential of 1.24 V (vs. RHE) in 1 M KOH with 0.5 M urea. We employed the CoOOH-Ni(OH)2 nanoclusters as anodic electrocatalysts in a two-cell electrolyzer for asymmetric electrocatalysis. Hydrogen could be produced at a remarkable current density of 10 mA cm−2 at a low applied potential of only 0.45 V. Density functional theory calculations revealed that blending CoOOH-Ni(OH)2 nanoclusters with more oxygen vacancies exhibited a lower Gibbs free energy for the intermediate reaction pathway of NCONH2 → NCONH, compared with the fine structure of CoNiOx (x = 2-3). This study lays down a novel pathway for developing new blending electrocatalysts to be used in electrochemical reactions. © 2024 The Royal Society of Chemistry.

关键词： Nanoclusters

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Design and Validation of a Prosthetic Foot Adaptable to Sagittal Plane Ground Irregularity

Design and Validation of a Prosthetic Foot Adaptable to Sagi...

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2024 International Symposium on 3D Analysis of Human Movement, 3DAHM 2024

作者： Lagones, Marco Abarca, Victoria E. Elias, Dante A. Biomedical Engineering Program Pontificia Universidad Católica del Perú Biomedical Engineering Program Universidad Peruana Cayetano Heredia Lima Peru Pontificia Universidad Católica del Perú Biomechanics and Applied Robotics Research Laboratory Lima Peru

ISBN: (纸本)9798331521738

Amputation involves the removal of a limb or part of it. In the case of the lower extremity, amputation affects the ankle joint and the metatarsophalangeal and intertarsal joints, improving the foot's adaptability on uneven terrain. Therefore, based on state-of-the-art technology that does not address the other joints of the foot to a large extent, a prosthetic foot has been developed that integrates the support structure of the foot through a foot arch with an extension analogous to the forefoot and an elastic element that mimics the plantar fascia that deforms against obstacles and provides stability to the prosthetic arch foot. The work addresses the design of the prosthetic foot from its design to its prototyping and validation, where the foot was shown to withstand the loads recommended for the P5 category of the ISO 22675 standard and to provide a return energy equal to 95.72%, 77.13%, and 90.21 %, in the heel strike, mid-stance, and toe-off stages, respectively. In addition to showing linear stiffness properties (66.95 kN /m) and torsional stiffness properties(2.05 kN.m/rad) in the forefoot analog element, values that are comparable with those recorded in commercial tests such as LP Variflex categories 7 and 8. © 2024 IEEE.

关键词： Arches

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Human Sensing - Emotion and Stress

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IEEJ Transactions on Sensors and Micromachines 2023年第9期143卷 263-268页

作者： Yamaguchi, Masaki Department of Biomedical Engineering Graduate School of Medicine Science & Technology Shinshu University 3-15-1 Tokida Ueda386-8567 Japan

Assessing emotion, stress and anxiety is challenging because individuals differ by personality characteristics, age, gender, culture, and country;all of which can modify how they verbally express or report mental and emotional well-being. To overcome the limitations of subjective self-reports, researchers have increasingly focused on methods that quantify the biological changes associated with the neuroendocrine stress response. Disruptions in homeostasis, i.e., stress, place demands on the body that are met by the activation of two systems and manifest as quantifiable physiological changes in heart rate, blood pressure, and pupillary reflex as well as differential expression of stress biomarkers such as cortisol, dehydroepiandrosterone-sulphate (DHEA-S) and adrenaline. Although attaining happiness and overcome stress are nearly universal goal, surprisingly little research has focused on how happiness can be increased and stress can be decreased. This review paper focuses on the current status and future prospects of diagnostic methodologies using saliva samples. Chemical salivary test has overwhelming advantages over blood test in that it is intrinsically safe and test samples can be self-collected any time. The direction of new applications for salivary sensors is discussed by introducing commercially available salivary tests for the detection of emotion and stress. © 2023 Institute of Electrical Engineers of Japan. All rights reserved.

关键词： Biomarkers

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Suprachoroidal Retinal Stimulation Leveraging Temporal Interference Technology: A Modelling Study 16

Suprachoroidal Retinal Stimulation Leveraging Temporal Inter...

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16th International Congress on Image and Signal Processing, biomedical engineering and Informatics, CISP-BMEI 2023

作者： Liu, Jiao Song, Xiaoyu Zhou, Feng Ma, Saidong Liu, Zhengyang Li, Jiaxi Chai, Xinyu Li, Liming Guo, Tianruo Shanghai Jiao Tong University Sjtu School of Biomedical Engineering Shanghai China The University of New South Wales Unsw Graduate School of Biomedical Engineering Sydney Australia

ISBN: (纸本)9798350330755

A suprachoroidal retinal prosthesis is implanted between the choroid and the sclera, offering the advantages of low surgical complexity and high stability. However, the relatively longer distance between electrodes and the retina leads to higher retinal ganglion cells (RGC) excitation threshold and lower spatial resolution. To maximize the advantages of suprachoroidal stimulation (SS), it is of great significance to explore additional strategies to lower the threshold and improve the spatial resolution. Temporal interference (TI) was reported to induce localized neural excitation in deep regions, indicating a promising avenue for enhancing suprachoroidal retinal stimulation. This study combines the advancements of TI and SS, resulting in the novel approach of Temporal Interference-Suprachoroidal Stimulation (TI-SS). The effect of electrode position and size on the distribution of the maximum electric potential (EPmax) generated by TI-SS was investigated by finite element modelling. Higher EPmax values corresponds to lower RGC excitation threshold. In addition, the EPmax distribution induced by TI-SS and SS were compared. Our simulation suggests a decrease in EPmax value when stimulating electrodes are moved from cornea to sclera under TI-SS. And the EPmax distribution exhibits a notable transition from a bimodal distribution to a unimodal distribution as the return electrodes are moved to the posterior of the eyeball and get closer. The EPmax values induced by TI-SS is generally higher than those induced by SS, indicating that RGC excitation threshold triggered by TI-SS is lower compared to SS. This study offers preliminary evidence demonstrating the enhanced performance of TI-SS in comparison to conventional SS approach. © 2023 IEEE.

关键词： Electrodes

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Development of Ultra-low Power Ultra-low Frequency Oscillator using GIDL current for Edge AI Devices for Long-Term and Intermittent Monitoring

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and Systems 2025年第3期145卷 391-398页

作者： Du, Bang Nakamura, Kohei Huang, Beiyutong Kataura, Aoi Hasegawa, Ryo Fukushima, Takafumi Kiyoyama, Koji Tanaka, Tetsu Graduate School of Engineering Tohoku University 6-6-12 Aza-Aoba Aramaki Aoba-ku Sendai980-8579 Japan Graduate School of Biomedical Engineering Tohoku University 6-6-12 Aza-Aoba Aramaki Aoba-ku Sendai980-8579 Japan Graduate School of Engineering Nagasaki Institute of Applied Science 536 Aba-machi Nagasaki851-0193 Japan

This paper describes a new ultra-low power and ultra-low frequency oscillator using the GIDL current used in edge AI devices for long-term and intermittent monitoring applications. Various characteristics of GIDL current were measured and compared with the subthreshold current. An ultra-low frequency GIDL ring oscillator was designed and evaluated based on the measurement results. As a result, ultra-low frequency oscillation from 0.94 to 5.1 Hz was successfully achieved. An extremely small circuit area was achieved because integrated resistors and capacitors were not used. From the power consumption analysis, a new low-power design was conducted from the viewpoints of "shortening the signal transition time of the buffer circuit" and "reducing the short-circuit current of the buffer circuit," and ultra-low power operation of 71.6 pW was successfully achieved in circuit simulation. GIDL ring oscillator is a promising candidate for an ultra-low power and ultra-low frequency oscillator with high environmental stability. © 2025 The Institute of Electrical Engineers of Japan.

关键词： Buffer circuits

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Light Gradient Boosting Machine-Based Fatality Prediction of Single-Vehicle Motorcycle Crashes 13

Light Gradient Boosting Machine-Based Fatality Prediction of...

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13th IEEE International Conference on Communication, Networks and Satellite, COMNETSAT 2024

作者： Zulherman, Dodi Yang, Jia Shimizu, Kosuke Yokota, Yasunari Gifu University Graduate School of Engineering Gifu Japan Telkom University Dept. of Biomedical Engineering Purwokerto Indonesia Gifu University Faculty of Engineering Gifu Japan

ISBN: (纸本)9798350368086

In this study, we utilized the light gradient boosting machine (LightGBM) model for prediction analysis of single-vehicle motorcycle crash fatality in Japan. We develop the model using Japan's traffic crash data from 2019 to 2022. Since the single-vehicle motorcycle crash dataset has an imbalanced distribution property between fatal and non-fatal accidents, it has difficulty predicting fatal cases due to predicting bias on non-fatal cases. To address this issue, we observed the effect of resampling techniques such as Synthetic Minority Oversampling Technique (SMOTE), Edited Nearest Neighbors (ENN), and SMOTE-ENN on the LightGBM prediction results. Furthermore, our LightGBM using Shapley additive explanations (SHAP) identified the most influential features in predicting single-vehicle motorcycle crash fatalities. The experiment based on evaluation metrics shows that combining LightGBM and resampling techniques significantly improved the model performance based on evaluation metrics such as accuracy, AUC, ROC curve and G-mean. This confirms the effectiveness of this approach in reducing the impact of the imbalanced dataset and improving single-vehicle motorcycle crash fatality predictions. Moreover, based on the SHAP value analysis, crash type, road alignment, collision manner, terrain, and motorcyclist age significantly affect the fatality of single-vehicle motorcycle crashes. © 2024 IEEE.

关键词： Motorcycles

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Typical Values in Digital Mammography Within the Framework of Diagnostic Reference Levels 9th

Typical Values in Digital Mammography Within the Framework o...

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9th Latin American Congress on biomedical engineering, CLAIB 2022 and 28th Brazilian Congress on biomedical engineering, CBEB 2022

作者： Real, J.V. Malthez, A.L.M.C. Graduate Program in Biomedical Engineering Federal University of Technology - Paraná Curitiba Brazil Clinical Hospital Complex of the Federal University of Paraná/Diagnostic Imaging Unit Curitiba Brazil

ISBN: (纸本)9783031494093

In the context of diagnostic reference levels (DRLs), typical values of mean glandular dose were established from a survey of mammographic examinations performed in a university hospital in Curitiba, Paraná, Brazil. This study represents an initial approach to the implementation of DRLs at the specific medical institution, as a means to improve the activities related to the radiological protection of patients managed by the Diagnostic Imaging Unit. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Medical imaging

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Perspectives for delivery of therapeutics by extravasation of biodegradable microspheres in the brain

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Neural Regeneration Research 2024年第5期19卷 969-970页

作者： Anne-Eva van der Wijk Ed VanBavel Amsterdam UMC location University of Amsterdam Department of Biomedical Engineering and PhysicsAmsterdamThe Netherlands Amsterdam Neuroscience Neurovascular Disorders ProgramAmsterdamThe Netherlands Amsterdam Cardiovascular Sciences Microcirculation ProgramAmsterdamThe Netherlands

Development of therapeutics for brain diseases has remained challenging,in particular due to the difficulty of passing the blood-brain *** a result,the current arsenal of therapeutics targeting the brain is limited to small,lipid-soluble drugs and there is a lack of options for treating neuroblastomas,Alzheimer’s disease,and many other devastating *** the advances in strategies for crossing the blood-brain barrier such as the use of nanoparticles(Hersh et al.,2022;Duan et al.,2023),such delivery systems have not yet reached clinical ***,novel platforms for the transport of therapeutics across the blood-brain barrier remain highly *** specifically holds for large molecules such as monoclonal antibodies and recombinant proteins,as well as nucleotide-based therapeutics and cell *** efforts in this field are increasing exponentially,with thousands of publications in the last few years.

关键词： therapeutics holds spite

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Comparative study of different controllers in an autonomous vehicle system

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Materials Today: Proceedings 2023年 80卷 2390-2393页

作者： Balaji, T.S. Srinivasan, S. Research Scholar Department of Electronics and Communication Engineering Saveetha School of Engineering SIMATS Tamil Nadu Chennai India Professor and Program Director Department of Biomedical Engineering Saveetha School of Engineering SIMATS Tamil Nadu Chennai India

In recent days the entire world moving towards autonomous driving vehicle. For the last decades, the world started more research on Autonomous or Auto-pilot vehicle. It faces lot of challenges to design such a system. In recent, Google and tesla designs an autonomous vehicle in the name of waymo. The main aim of this research work is to provide healthy transportation with high safety and security. This waymo vehicle is now under testing with conditional and unconditional environment. In this paper it is focused on a controller part to take care of the vehicle in critical and non-critical environmental situation. In this perception, this research gives the overview of the various controllers with its merits and demerits. The controller is to imitate like a human driver. Normally the human eye focus on mobile and immobile objects, road sign, pedestrian etc., the controller need to focus the road condition, optimal steering control with less tracking error and cruise control. © 2021

关键词： Autonomous vehicles

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