检索结果-内蒙古大学图书馆

70th International Conference on Vibroengineering

作者： Hussein, Mustafa T. Al-Juboori, Ameen M. Mahdi, Sarah Z. Department of Mechanical Engineering College of Engineering University of Babylon Babylon51001 Iraq Biomedical Engineering Department College of Engineering and Technologies Al-Mustaqbal University Babylon51001 Iraq College of Materials Engineering University of Babylon Babylon51001 Iraq

The aim of this work is the analysis of passive and semi-active damping methods on the model woven beam with a piezoelectric (PZ) layer. The mathematical model of the PZ layer on cantilever beam is derived. For modeling, real product parameters of PZ layer are used, and through simulation find the optimal values to dampen it. The resistive-inductance passive model, and State-Switch Damping SSD semi-active model are used in this work. The models are processed in the MATLAB Simulink environment and the results of the behavior of the models compared to each other. The program involving passive and semi-active systems, where analyze the behavior of the model for different parameters and the damping capabilities of individual methods are compared. The simulation results show the effectiveness of the semi-active system in comparison with the passive systems, also it shows the passive method is not so effective at low frequency as it in high frequency, and the semi-active method is not optimal for high frequency vibration. Copyright © 2024 Mustafa T. Hussein, et al.

关键词： Piezoelectricity

来源：评论

学校读者我要写书评

暂无评论

Optimization of laser parameters for ultrashort-laser spinal surgeries 23

Optimization of laser parameters for ultrashort-laser spinal...

引用

Frontiers in Ultrafast Optics: biomedical, Scientific, and Industrial Applications XXIII 2023

作者： Mishra, Biswajit Andrus, Liam Roy, Aditya Ben-Yakar, Adela Department of Mechanical Engineering The University of Texas Austin United States Department of Biomedical Engineering The University of Texas Austin United States

ISBN: (纸本)9781510659278

Ultrafast laser ablation supersedes conventional surgical techniques in terms of precision and thermal load generation. However, the main limiting criterion of the application of laser ablation techniques to surgeries has been the low material removal rate (MRR). In efforts to bridge the gap, a benchtop fiber-baser laser delivery system has been developed which demonstrated a MRR increase of ~15 times over the previously reported fs-laser surgical probes. The benchtop optical setup incorporates a hollow-core Kagome fiber (NA≈0.02) delivering high-power laser pulses from the Yb-doped fiber laser (λ=1035 nm) source to the sample. A Lissajous-based beam steering mechanism was employed to distribute the ultrashort laser pulses on the sample. The overall transmission efficiency of the system was 59%, with none of the components exhibiting any non-linear behavior at high peak intensities. For a FOV scan width of 250 μm, the logarithmic relationship between the ablation depth and laser fluence was determined for two different translational velocities. The system achieved material removal rates of ~2 mm3/min for the maximum applied laser fluence of 18.9 J/cm2, without initiating carbonization. Additionally, optimized laser parameters were implemented to achieve a clean-cut trench of 3 x 0.8 μm2 size and ~1.22 mm deep in under 3 minutes of laser exposure, which is within the surgical time bounds of a conventional spinal decompression technique. The fact that the trench is devoid of any carbonized section or unhealthy tissue, and was created without any irrigation setting only increases the reliability and viability of the ultrashort-laser ablation technique in surgical applications. © 2023 SPIE.

关键词： Carbonization

来源：评论

学校读者我要写书评

暂无评论

Bioactive superparamagnetic iron oxide-gold nanoparticles regulated by a dynamic magnetic field induce neuronal Ca^(2+)influx and differentiation

引用

Bioactive Materials 2023年第8期26卷 478-489页

作者： Elias Georgas Muzhaozi Yuan Jingfan Chen Ya Wang Yi-Xian Qin Department of Biomedical Engineering The State University of New York at Stony BrookStony BrookNYUnited States J.Mike Walker’66 Department of Mechanical Engineering Texas A&M UniversityCollege StationTXUnited States Department of Biomedical Engineering Texas A&M UniversityCollege StationTXUnited States Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTXUnited States

Treating neurodegenerative diseases,e.g.,Alzheimer’s Disease,remains a significant challenge due to the limited neuroregeneration rate in the *** objective of this study is to evaluate the hypothesis that external magnetic field(MF)stimulation of nerve growth factor functionalized superparamagnetic iron oxide-gold(NGF-SPIO-Au)nanoparticles(NPs)can induce Ca^(2+)influx,membrane depolarization,and enhance neuron differentiation with dynamic MF(DMF)outperforming static MF(SMF)*** showed the that total intracellular Ca^(2+)influx of PC-12 cells was improved by 300%and 535%by the stimulation of DMF(1 Hz,0.5 T,30min)with NGF-SPIO-Au NPs compared to DMF alone and SMF with NGF-SPIO-Au NPs,respectively,which was attributed to successive membrane *** uptake performed with the application of sodium azide proved that DMF enhanced cellular uptake of NGF-SPIO-Au NPs via *** addition,DMF upregulated both the neural differentiation marker(β3-tubulin)and the cell adhesive molecule(integrin-β1)with the existence of NGF-SPIO-Au NPs,while SMF did not show these *** results imply that noninvasive DMF-stimulated NPs can regulate intracellular Ca^(2+)influx and enhance neuron differentiation and neuroregeneration rate.

关键词： Calcium influx Membrane potential Dynamic magnetic fields Neuroregeneration SPIO-Au Core-shell nanoparticles

来源：评论

学校读者我要写书评

暂无评论

The Effect of Time-Dependent Prestresses at the Bone-Screw Interface under Bending Load 31

The Effect of Time-Dependent Prestresses at the Bone-Screw I...

引用

31st National and 9th International Iranian Conference on biomedical engineering, ICBME 2024

作者： Ghazijahani, Ahmad Babazadeh Rajaeirad, Mohadese Rouyin, Alireza Kiapour, Ali Andersen, Michael Skipper Einafshar, Mohammadjavad Matin Amirkabir University of Technology Department of Biomedical Engineering Tehran Iran University of Isfahan Faculty of Engineering Department of Biomedical Engineering Isfahan Iran Sharif University of Technology Department of Mechanical Engineering Tehran Iran Massachusetts General Hospital Department of Neurosurgery Boston United States Aalborg University Department of Material and Production Aalborg Denmark

ISBN: (纸本)9798331529710

The viscoelastic properties of bone significantly influence the mechanical stability of bone-screw complex. This study aims to evaluate the changes in stiffness of a bone-screw model under different bending displacements and pre-stress conditions over time. Using a finite element model, we applied bending displacements of 12,24, and 48 μm were applied to the head of the screw. The stiffness was predicted at time intervals of 1,61,121, and 181 seconds to assess the impact of stress relaxation. The bone was modeled with viscoelastic properties, and the screw was considered rigid. The results showed a decrease in stiffness with increasing displacement. At 12 μ m, the initial stiffness was approximately 6.41 kN/mm, decreasing slightly over time due to stress relaxation. At higher displacements (24 and 48 μ m), the stiffness reduction was more pronounced, especially in the absence of pre-stress, highlighting the significant role of initial thread engagement. Pre-stress conditions led to a stiffness increase of up to 70% compared to the free-stressed state. The study demonstrates that both displacement and pre-stress significantly affect the stiffness of the bone-screw interface. Increased displacement reduces stiffness, while pre-stress raises it. Understanding these interactions is crucial for optimizing orthopedic implant design and surgical techniques to improve patient satisfaction and outcomes. © 2024 IEEE.

关键词： Stiffness

来源：评论

学校读者我要写书评

暂无评论

Analysis of Temiki (Melastoma Candidum) Extract Compounds as Corrosion Inhibitors Using GC–MS 4th

Analysis of Temiki (Melastoma Candidum) Extract Compounds as...

引用

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

作者： Supardi, Joli Rizal, Samsul Ali, Nurdin Fonna, Syarizal Ikramullah, Ikramullah Arifin, A.K. Doctoral Program School of Engineering Post Graduate Program Syiah Kuala University Banda Aceh23111 Indonesia Department of Mechanical Engineering Teuku Umar University Meulaboh23615 Indonesia Department of Mechanical and Industrial Engineering Syiah Kuala University Banda Aceh23111 Indonesia Department of Mechanical and Materials Engineering Universiti Kebangsaan Malaysia Selangor DE Bangi43600 Malaysia

ISBN: (纸本)9789819974948

Temiki (Melastoma Candidum) is one of the unutilized wild plants observed to be turning pests on plantations. It has only been used for medicine and not for engineering purposes. Therefore, this study aims to identify and analyze Temiki’s chemical compounds, which are useful as corrosion inhibitors. The plant was washed, dried, then blended until it became a fine powder, and was further extracted by employing the maceration method with ethanol as solvent. The extracted compounds were also analyzed using Gas Chromatography-Mass Spectrophotometry (GC–MS) and the results obtained include, 2-Furancarboxaldehyde (CAS) Furfural, 1,2,3-Propanetriol (CAS) Glycerol, Acetic acid,1-(2-methyltetrazole-5-yl) etheny, 4H-Pyran-4one,2,3-dihydro-3,5-dihydroxy, 5-Hydroxymethylfurfural, cis-dimethylmorpholine, 3-penten-1-ol,2,2,4-trimethyl-(CAS)2,2,4, 2-AMINO-9-(3,4-DIHYDROXY-5-HYDORO, D-Allose, beta-D-Glucopyranoside, methyl, Hexadecanoic acid, methyl ester, 9,12,15-Octadecatrienoic acid, methyl ester. In conclusion, these chemical compounds were useful as corrosion inhibitors. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Corrosion

来源：评论

学校读者我要写书评

暂无评论

Design and analysis of an intra-abdominal wall-lifting device for vNOTES

引用

Biomimetic Intelligence & Robotics 2023年第1期3卷 74-85页

作者： Jie Wang Yue Zhou Xiao Xiao Jiaole Wang Li Liu Department of Electronic Engineering The Chinese University of Hong KongHong Kong 999077China Department of Biomedical Engineering Tsinghua UniversityBeijing 100084China Department of Electronic and Electrical Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Mechanical Engineering and Automation Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Natural orifice transluminal endoscopic surgery(NOTES)associated with less pain,shorter hospital stay,and outstanding cosmetic results has drawn considerable attention from the academic *** NOTES,pneumoperitoneum is an essential technology to obtain intraperitoneal surgical space,which,however,can have some serious adverse hemodynamic *** this paper,we propose a novel intra-abdominal wall-lifting device that can replace the pneumoperitoneum functionally for transvaginal NOTES(vNOTES).The device consists mainly of two layers of elastic strips,namely,the outer strips that are used to lift the abdominal wall for surgical exposure and the inner strip with a camera mounted that can rotate to provide a wide surgical field of *** the design,gasless vNOTES can be carried out with 82.74% of the operative field provided by pneumoperitoneum,eliminating all complications associated with gas *** design principle and kinematic analysis of the device are discussed in detail and validated by ***,a prototype is fabricated to demonstrate the feasibility of the proposed concept.

关键词： Gasless NOTES Transvaginal NOTES Abdominal lifting device Large deflection compressive column

来源：评论

学校读者我要写书评

暂无评论

Integrated Hydraulic-Driven Wearable Robot for Knee Assistance

引用

Journal of Shanghai Jiaotong university(Science) 2023年第3期28卷 289-295页

作者：赵亚飞黄超逸邹玉莹邹可涵邹笑阳薛嘉琦李晓婷 KOH Keng Huat 王小军赖伟超胡勇席宁王峥 Department of Industrial and Manufacturing Systems Engineering The University of Hong KongHong KongChina Department of Mechanical Engineering The University of Hong KongHong KongChina Department of Orthopaedics and Traumatology The University of Hong KongHong KongChina Department of Biomedical Engineering City University of Hong KongHong KongChina Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina

Age-related diseases can lead to knee joint misfunction, making knee assistance necessary through theuse of robotic wearable braces. However, existing wearable robots face challenges in force transmission and humanmotion adaptation, particularly among the elderly. Although soft actuators have been used in wearable robots,achieving rapid response and motion control while maintaining portability remains challenging. To address theseissues, we propose a soft-robotic knee brace system integrated with multiple sensors and a direct-drive hydraulicactuation system. This approach allows for controlled and rapid force output on the portable hydraulic *** multi-sensor feedback structure enables the robotic system to collaborate with the human body throughhuman physiological signal and body motion information. The human user tests demonstrate that the knee robotprovides assistive torques to the knee joint by being triggered by the electromyography signal and under humanmotion control.

关键词： wearable robot soft robot assistance device

来源：评论

学校读者我要写书评

暂无评论

Preliminary Investigation of Spring-Based Gravity Compensation for an Upper Limb Assistive Robot

Preliminary Investigation of Spring-Based Gravity Compensati...

引用

2025 IEEE International Conference on Mechatronics, ICM 2025

作者： Jiang, Ming Wang, Yang Meng, Qizhi Kuo, Chin-Hsing Ceccarelli, Marco Sugahara, Yusuke Takeda, Yukio Institute of Science Tokyo Department of Mechanical Engineering Tokyo Japan School of Mechanical Materials Mechatronic and Biomedical Eng. University of Wollongong Wollongong Australia University of Rome Tor Vergata Department of Industrial Engineering Rome Italy

ISBN: (纸本)9798331533892

Upper limb assistive robots have been widely developed due to their ability to aid user movement and reduce caregiver workload. In our previous work, we introduced a wearable end-effector-type upper limb assistive robot, WELiBot. To enhance the robot's portability and reduce the required actuation torque, this work investigates gravity compensation for WELiBot's mechanism using springs. Following the 1-DOF gravity compensation principle, springs were designed for lifting and reaching movement respectively. The effectiveness of this compensation effect was then evaluated by comparing the necessary torque at the actuating joints with and without springs. This work offers insight into gravity compensation for parallel mechanisms and contributes to the future development of WELiBot. © 2025 IEEE.

关键词： End effectors

来源：评论

学校读者我要写书评

暂无评论

Comparative Analysis of AD8232 and BioAmp EXG Pill Analog Front-End Devices in ECG Signal Processing 11

Comparative Analysis of AD8232 and BioAmp EXG Pill Analog Fr...

引用

11th IEEE Conference on Systems, Process and Control, ICSPC 2023

作者： Mamee, Tanakrit Manorost, Panason Chamroon, Chakkapong Thunsiri, Kittiya Chiang Mai University Program in Mechanical Engineering Department of Mechanical Engineering Chiang Mai Thailand Ku Leuven University Faculty of Bioscience Engineering Leuven Belgium Biomedical Engineering Institute Chiang Mai University Chiang Mai Thailand Chiang Mai University Department of Mechanical Engineering Chiang Mai Thailand Chiang Mai University Faculty of Engineering Chiang Mai Thailand

ISBN: (纸本)9798350340860

The development of compact portable ECG monitoring devices often entails the pursuit of downsizing measurement systems. This objective frequently involves additional efforts, such as custom PCB fabrication for analog front-end systems and exploration of alternative electrode types and configurations. In this study, we investigate the feasibility of using the BioAmp EXG Pill, a miniature commercial analog front-end board, in comparison to the well-established AD8232. Our analysis focuses on comparing ECG signals from five adult subjects, examining both frequency components using the welch estimation method and ECG parameters extracted from time-domain signals. The results reveal that both devices provided similar outcomes in time-domain measurements, with a slightly lower standard deviation observed in the AD8232. In terms of spectral density, both devices proficiently captured low-frequency components within the 0-3 Hz range. However, in higher-frequency domains, the AD8232 demonstrated superior capability in capturing finer frequency details. © 2023 IEEE.

关键词： Electrocardiograms

来源：评论

学校读者我要写书评

暂无评论

IFWG-TOPSIS Model for Supporting Infant Failure Assessment in an Offshore Wind Turbine System

引用

Recent Advances in Computer Science and Communications 2022年第4期15卷 487-494页

作者： Aikhuele, Daniel O. Ighravwe, Desmond Eseoghene Babatunde, Olubayo Moses Department of Mechanical and Biomedical Engineering Bells University of Technology Ota Nigeria Department of Electrical and Electronics Engineering University of Lagos Lagos Akoka Nigeria

Introduction: System failure analysis is an essential aspect of equipment management. This analysis improves equipment reliability and availability. However, to assess infant failure under dynamic criteria, reliability engineers require special models. Methods: Hence, this study uses an Intuitionistic Fuzzy Weighted Geometric (IFWG) and Intuitionistic Fuzzy Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) methods to develop an IFWG-TOPSIS model for infant failure assessment. We consider a case study of Offshore Wind (OFW) turbine infant failure assessment. Results: During the model evaluation, this study considered an infant failure of the turbine's main shaft, blade bearings, pitch system, jacket and monopile support structure, and gearbox. Risk factor, spare part weight, technical importance, cost, and complexity criteria were used to evaluate these components’ reliability. The results show that the blade bearings (S2) and main shaft are the most and least reliable components, respectively. To validate the model’s performance, we compared its results with Gümüş and Bali’s and standard VIKOR models results. These models selected the same components as the most and least reliable components, respectively. Thus, the proposed model is suitable for OFW turbine’s infant failure assessment. Discussion: It can be deduced that the use of the modified IFWG operator to calculate the intuition-istic fuzzy distance measure in standard TOPSIS model as the capacity to produce realistic results that can compete with existing decision-making methods. Conclusion: This study has investigated the use of techno-economic criteria for OFW turbine com-ponents’ infant failure assessment. A fuzzy-based model was used to establish the connection be-tween the criteria and the components. We developed this model using the Intuitionistic Fuzzy Weighted Geometric (IFWG) and Intuitionistic Fuzzy Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS)

关键词： Offshore wind turbines

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：