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Volume Loss and Recovery in Bovine Knee Meniscus Loaded in Circumferential Tension

Journal of Biomechanical engineering 2023年第7期145卷 071009页

作者： Peloquin, John M. Santare, Michael H. Elliott, Dawn M. Department of Biomedical Engineering University of Delaware 540 S College Ave Rm 125 NewarkDE19716 United States Department of Mechanical Engineering University of Delaware NewarkDE United States

Load-induced volume change is an important aspect of knee meniscus function because volume loss creates fluid pressure, which minimizes friction and helps support compressive loads. The knee meniscus is unusual amongst cartilaginous tissues in that it is loaded not only in axial compression, but also in circumferential tension between its tibial attachments. Despite the physiologic importance of the knee meniscus' tensile properties, its volumetric strain in tension has never been directly measured, and predictions of volume strain in the scientific literature are inconsistent. In this study, we apply uniaxial tension to bovine knee meniscus and use biplanar imaging to directly observe the resulting three-dimensional volume change and unloaded recovery, revealing that tension causes volumetric contraction. Compression is already known to also cause contraction;therefore, all major physiologic loads compress and pressurize the meniscus, inducing fluid outflow. Although passive unloaded recovery is often described as slow relative to loaded loss, here we show that at physiologic strains the volume recovery rate in the meniscus upon unloading is faster than the rate of volume loss. These measurements of volumetric strain are an important step toward a complete theory of knee meniscus fluid flow and load support. Copyright © 2023 by ASME.

关键词： Axial compression

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Comparison of the elastography resolution between shear wave and reverberant optical coherence elastography 12

Comparison of the elastography resolution between shear wave...

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Optical Elastography and Tissue Biomechanics XII 2025

作者： Zevallos-Delgado, Christian Singh, Manmohan Aglyamov, Salavat R. Larin, Kirill V. Department of Biomedical Engineering University of Houston HoustonTX77204 United States Department of Mechanical and Aerospace Engineering University of Houston HoustonTX77204 United States

ISBN: (纸本)9781510683907

Reverberant optical coherence elastography (RevOCE) is an emerging elastography technique with potentially superior elasticity resolution and contrast than traditional wave-based OCE. Indeed, the potential advantage of RevOCE over other elastography methods is its ability to overcome complex boundary conditions and provide greater mechanical contrast. These properties are particularly noteworthy because traditional wave-based OCE is strongly affected by complex sample boundary conditions and tissue heterogeneity. On the other hand, it has been observed that complex boundary conditions seemed to favor RevOCE since multiple boundaries in complex tissues cause reflections that result in a greater reverberant field distribution in all directions, and these reflections make traditional wave-based measurements difficult. In this study, we compared the axial and lateral mechanical resolution obtained by traditional wave-based OCE against RevOCE at different excitation frequencies (1, 5, and 10 kHz), and to evaluate the axial and lateral elastography resolutions, we utilized a heterogeneous phantom composed of 4% and 8% gelatin (w/w). The results showed that RevOCE offers superior elastography resolution compared with traditional wave-based OCE at all frequencies. At 1 kHz stimulation, RevOCE improved the mechanical resolution by ~46 % and ~25% in the axial and lateral directions. When the excitation frequency was increased to 5 kHz, the axial mechanical resolution improved by ~75% and ~22% in the lateral direction. Finally, at 10 kHz, the axial resolution was improved by ~75 %. RevOCE possessed finer mechanical resolution compared with unidirectional wave-based methods, laterally and axially. Our future work is focused on validating these results with analytical and computational simulations as well as more complex structured phantoms to understand the source of the improved resolution. © 2025 SPIE.

关键词： Shear waves

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Development of a Smart Guidewire for Intravascular Sensing 9th

Development of a Smart Guidewire for Intravascular Sensing

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9th International Conference on the Development of biomedical engineering in Vietnam, BME 2022

作者： Dong, Chao-Wei Joo, Dong-Hyun Moon, Ki-Jeong Yoon, Se-Yeon Nguyen, Hua Quang Huy Park, Woo-Tae Department of Mechanical Engineering Seoul National University of Science and Technology Seoul01811 Korea Republic of Convergence Program of Biomedical Engineering and Biomaterials Seoul National University of Science and Technology Seoul01811 Korea Republic of

ISBN: (纸本)9783031446290

This study presents a smart guidewire developed to measure the pressure inside blood vessels during minimally invasive surgery. The use of pressure sensor guidewires enables the medical doctor to make a judgement of the stent insertion procedure by precisely measuring coronary pressure. A pressure sensor is embedded inside the guidewire to measure the coronary lesion's vascular pressure to determine the clogging's severity. Pressure sensors inside the guidewires require high sensitivity, good linearity, and huge size reduction. The pressure sensor needs to be packaged inside a 350 µm diameter catheter. Size constraints and mechanical reliability requirements are extremely high. We describe the design and manufacture of the micro-scaled pressure sensor and the packaging process of the guidewire. To improve sensor sensitivity and reduce nonlinearity, we employed a finite element analysis to optimize the design for the membrane. The sensor fabrication process employs a cavity-first process for ultrathin sensor design. Additionally, we built a measurement system that records the sensor signal in air pressure. The results showed that the air pressure ranged up to 7.2 psi. We developed a systematic setup for assembling the ultraminiature pressure sensor inside the 800 µm guidewire. The packaging procedure includes the preparation of the electric wires, sensor placement, sensor to wire alignment, soldering, and finally, wired sensor placement inside the medical tubing. © The Author(s), under exclusive license to Springer Nature Switzerland AG. 2024.

关键词： Pressure sensors

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Non-contact reverberant optical coherence elastography using air-coupled ultrasonic transducers 12

Non-contact reverberant optical coherence elastography using...

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Optical Elastography and Tissue Biomechanics XII 2025

作者： Zevallos-Delgado, Christian Mekonnen, Taye T. Schill, Alexander W. Singh, Manmohan Aglyamov, Salavat R. Larin, Kirill V. Department of Biomedical Engineering University of Houston HoustonTX77204 United States Department of Mechanical and Aerospace Engineering University of Houston HoustonTX77204 United States

ISBN: (纸本)9781510683907

Dynamic optical coherence elastography (OCE) is a well-established technique for mapping tissue biomechanical properties, often based on the speed of propagating mechanical waves. However, the inherent inhomogeneity of tissues can bias wave speed estimations. A new OCE technique termed Reverberant OCE (RevOCE) based on inducing and imaging a reverberant shear field has shown improved mechanical characterization of tissues, i.e., mechanical resolution and contrast. Several techniques have been proposed to generate a reverberant shear field, using contact (micro tapping) and non-contact (acoustic radiation force immersed in water) methods to create a reverberant shear field. However, there has been no demonstration of truly non-contact RevOCE. In this study, three air-coupled ultrasound (ACUS) transducers were used to implement a completely non-contact form of RevOCE. Three 1 MHz ACUS transducers with a ~19 mm diameter were aligned in the same plane with 60° of inclination in a circular arrangement, leaving a space in the middle for OCT scanning. The RevOCE measurement was performed using ten cycles at a frequency of 2 kHz on 101 by 101 M-3D protocol on a gelatin phantom with an irregular shape. A robust reverberant shear field was observed and distributed through the sample. Non-contact RevOCE can effectively be used to analyze the biomechanical properties of tissues that are sensitive to contact methods. © 2025 SPIE.

关键词： Optical coherence tomography

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Alteration to Control Surface Heating in a Mach 7 Flow with Upstream Deformation

Alteration to Control Surface Heating in a Mach 7 Flow with ...

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

作者： Reeves, Neel Kreth, Phillip A. Department of Mechanical Aerospace and Biomedical Engineering The University of Tennessee Space Institute TullahomaTN37388 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Thermal deformation of body panels due to expected heat loads is an important consideration in high-speed vehicle design. While several studies have been conducted to determine the localized impacts of deformed surfaces on a flowfield, little is known about how such deformation may impact the thermal loading of downstream control surfaces as a result of the upstream flow field alterations. In this study, axisymmetric, sinusoidal deformations, representative of thermally deformed panels, are placed on a hollow-cylinder upstream of a flare, and potential alterations to the flare heating are studied. The present work uses a combination of high-speeds chlieren imaging and infrared (IR) thermography to observe potential heating changes and their causative mechanism. Analysis of the high-speed schlieren and IR thermography data suggests that despite a link in dynamic content between the deformation generated shockwave-boundary layer interaction (SBLI) and the flare SBLI, the upstream deformation has little effect onflare peak heating magnitude or location. Regardless of the size or position of the upstream deformation used in the present work, the flare peak heating is consistently located in the region in which the boundary layer, separated from the hollow-cylinder upstream of the flare by the flare SBLI, reattaches on the face of the flare. Additionally, the size and position of the upstream deformation seems to have little impact on the magnitude of flare heating, with a difference of only ⇠10% between configurations tested. In some cases, the shock structuregenerated by the deformation creates secondary heating peaks on the face of the flare, where these peaks are lower in magnitude compared to the boundary layer reattachment region. These secondary heating peaks are located underneath the shock-shock interaction (SSI) generated by the deformation shock structure impinging on the face of the flare. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA.

关键词： Boundary layers

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Hyperspectral Image Classification Using Custom Spectral Convolutional Neural Networks (CSCNNs) 14

Hyperspectral Image Classification Using Custom Spectral Con...

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14th International Conference on Information Science and Technology, ICIST 2024

作者： Rouamba, Stephanie Zhang, Nian Mahmoud, Wagdy Thompson, Lara Denis, Max Deksissa, Tolessa University of the District of Columbia Department of Electrical and Computer Engineering WashingtonDC United States University of the District of Columbia Department of Mechanical Engineering Biomedical Engineering Program WashingtonDC United States University of the District of Columbia Department of Mechanical Engineering WashingtonDC United States Water Resources Research Institute University of the District of Columbia WashingtonDC United States

ISBN: (纸本)9798350353334

Custom spectral convolutional neural networks (CSCNNs) combine the strengths of convolutional neural networks with specialized spectral processing, resulting in improved classification accuracy by effectively capturing subtle variations in hyperspectral data. This paper proposes a CSCNNs based approach to classify hyperspectral images. The proposed method leverages the high-dimensional spectral data inherent in hyperspectral images, employing convolutional layers specifically designed to capture spectral-spatial features. By reducing dimensionality through principal component analysis and creating image patches, the model is trained to recognize complex patterns across different spectral bands. In addition, a comprehensive analysis of CSCNN performance is carried out, focusing on its architecture, key features, and benefits in computational efficiency and spectral representation. Experimental results on datasets such as Salinas-A, Pavia University (Pavia-U), and Indian Pines demonstrate that the CSCNN model surpasses traditional methods, achieving higher classification accuracy and more robust performance metrics like overall accuracy (OA), average accuracy (AA), and Kappa coefficient. The proposed model achieved an overall accuracy (OA) of 98.2%, 96.7%, and 92.5% for the Salinas-A, Pavia-U, and Indian Pines datasets, respectively. The model's average accuracy (AA) was 97.5%, 95.4%, and 89.8% for the same datasets. Furthermore, the model attained Kappa coefficients of 97.7%, 95.2%, and 89.1% for Salinas-A, Pavia-U, and Indian Pines, respectively. © 2024 IEEE.

关键词： Convolutional neural networks

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A Methodology for Quantifying Neurological Adaptation to Physiotherapy in ACL-Injured Patients through Muscle Activity and Brain Connectivity Analysis 24

A Methodology for Quantifying Neurological Adaptation to Phy...

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11th International Conference on biomedical and Bioinformatics engineering, ICBBE 2024

作者： Katmah, Rateb Alshehhi, Aamna Kosaji, Doua Al-Rahmani, Nour Albizreh, Anas Hulleck, AbdulAziz Khalaf, Kinda Department of Biomedical Engineering & Biotechnology Khalifa University Abu Dhabi United Arab Emirates Department of Mechanical Engineering Khalifa University Abu Dhabi United Arab Emirates

ISBN: (纸本)9798400718274

In this study, we propose a methodology for investigating the effects of a single physiotherapy session on gait patterns and brain connectivity in patients with an anterior cruciate ligament (ACL) injury. A case study based for one patient with ACL injury is used for proof of concept. Both Gait and EEG data were collected before and after therapy which consisted of electrical muscle stimulation and ultrasound. Muscle activity in the right lower limb showed significant changes post-therapy, particularly in the vastus lateralis, rectus femoris, and gastrocnemius muscles. Meanwhile, analysis of brain functional connectivity revealed increased connectivity in the frontal regions and between motor-related brain areas post-therapy, suggesting enhanced motor control and coordination. These findings highlight the potential of targeted physiotherapy interventions to improve both physical and neurological aspects of rehabilitation in ACL-injured individuals. More clinical studies are needed to validate our preliminary data. Copyright © 2024 held by the owner/author(s). Publication rights licensed to ACM.

关键词： Brain

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Thermal Performance of the Heat Pipe and Thermoelectric Sterilization Face Mask 3rd

Thermal Performance of the Heat Pipe and Thermoelectric Ster...

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3rd International Conference on Experimental and Computational Mechanics in engineering, ICECME 2021

作者： Septiadi, Wayan Nata Marianti, Komang Manik Adi, Made Nara Pradipta Alim, Muhamad Rizkiantoro, Cheto Ramadhani, Dandi Dwipayana, Anak Agung Gde Agung Krisnanta Department of Mechanical Engineering Udayana University Bali Indonesia Bachelors Program in Mechanical Engineering Udayana University Bali Indonesia

ISBN: (纸本)9789811936289

The spread of the coronavirus has been the focus the world's attention. The government has issued a new regulation on the coronavirus that obligates the entire community to always wear a face mask and implement social distancing to prevent the spread of viruses. These issues have been impacted by an increase in the use of face masks throughout the world and in Indonesia. Moreover, the World Health Organization (WHO) suggested using medical face masks. Furthermore, in the health care sector, the possible loading of pathogens in sub-micrometer sizes and properties such as splash resistance and the ability to prevent infection by reducing the concentration of inhaled particulates has created limitations on the types of face masks that can be used. Therefore it is necessary to design a face mask sterilizer device that can extend the life span of masks, thereby decreasing the masks consumption. An investigation on mask sterilizer devices based on heat pipes and thermoelectrics was conducted in this study. The objective of this study was to investigate the thermal performance of the mask sterilizer device. The method used was an experimental method using variations in the input voltage on the thermoelectric, namely 9 V, 10 V, and 11 V, and the microcontroller was also adjusted to control the temperature by 70 ℃, 80 ℃, and 90 ℃. The results showed that the thermoelectrics can generate heat with a temperature difference between the hot side and the cold side that can reach 80.11 ℃. In terms of voltage, the greater voltage that was given led to a greater resulting temperature of the sterilization device and reduced the amount of time to achieve the minimum sterilization temperature. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Sterilization (cleaning)

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Integrated wind farm solutions: Harnessing clean energy for electricity, hydrogen, and freshwater production

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International Journal of Hydrogen Energy 2024年 138卷 1213-1227页

作者： Assareh, Ehsanolah saberipour, Mohammad Ahmadinejad, Mehrdad Keykhah, Mohammad Agarwal, Neha Boudaghi, Farnaz Lee, Moonyong School of Chemical Engineering Yeungnam University Gyeongsan38541 Korea Republic of Department of Renewable Energy Technology Materials and Energy Research Center Dezful Branch Islamic Azad University Dezful Iran Department of Mechanical Engineering Arvandan Non-profit Higher Education Institute Khorramshahr Iran Department of Mechanical Engineering University of Vermont BurlingtonVT United States Department of Chemical Engineering Mahshahr Branch Islamic Azad University Mahshahr Iran Department of Electrical and Biomedical Engineering University of Vermont BurlingtonVT United States

This research explores the design, modeling, and feasibility of a multi-energy wind power plant in South Korea, aimed at producing electricity, fresh water, hydrogen, and oxygen. The main goal of the current study is to help the energy production system that uses the high potential of wind energy in areas with wind potential to increase power and efficiency and reduce harmful environmental effects for the production of hydrogen and fresh water. The system employs a PEM electrolyzer unit and reverses osmosis technology for hydrogen, oxygen, and freshwater generation. The innovation of this study lies in the integration of wind farm design with optimal electricity allocation to electrolyzers, reverse osmosis units, and the grid, maximizing efficiency and sustainability. A comprehensive case study is presented, evaluating the viability of putting the suggested strategy into practice in ten South Korean cities, with a focus on hydrogen production from wind energy. The study investigates ten scenarios for selecting the number of wind turbines, electrolyzers, and reverse osmosis devices, and sixteen scenarios for dividing wind farm coefficients to supply grid electricity, electrolyzer electricity, and reverse osmosis electricity. The optimal result indicates that 5% of wind farm electricity should be allocated to reverse osmosis units, 15% to electrolyzers, and 80% to the grid. The economic analysis indicates that among the system components, the wind farm, reverse osmosis, and PEM electrolyzer represent the highest costs. The system's performance is assessed across ten cities in South Korea, with Yeosu, Incheon, and Busan determined to be the best sites for the proposed power plant because of their strong potential to produce hydrogen using wind energy. Implementing the system in Yeosu, the optimal city, may stop 9664.326 tons of carbon dioxide from being released, generate 47374.15 MWh of electricity, and expand 46 ha of green space. Additionally, selling 9474.83 MW of

关键词： Desalination

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Characteristics of Heat Transfer of Cooling Tower Flat Type Flat Storage 4th

Characteristics of Heat Transfer of Cooling Tower Flat Type ...

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

作者： Rajai, Afdhalul Syuhada, Ahmad Razali Master of Mechanical Engineering Program Faculty of Engineering Universitas Syiah Kuala Banda Aceh23111 Indonesia Department of Mechanical Engineering Universitas Syiah Kuala Darussalam Banda Aceh23111 Indonesia

ISBN: (纸本)9789819974948

Cooling tower is a heat transfer device that works through water media, along with air used to cool the temperature using water media with direct contact with air which causes some of the water to evaporate. To improve the performance of the cooling tower, many trials and research have been carried out, one of which is by adjusting the hole in the cooling tower area as a liquid medium distribution. From this phenomenon, this study examines the effect that occurs on the number of holes on the rate of movement of the flat plate cooling tower with the overall height of the cooling tower 2.4 m, the number of distribution media for the cooling tower water flow is 5 plates in succession, and the length of each plate is 0.7 m with a width of 0.5 m. Plate variations are given to the cooling tower, namely plate without holes, plate 25 plate holes, 35 holes, 45 holes zig-zag hole model on the cooling tower. The diameter of each plate hole is 0.02 m with the slope ratio of each plate arrangement which is 15°. The results showed the highest heat transfer rate occurred in the cooling tower water inlet temperature of 75 °C. The plate variation used was the plate without the inlet hole model. And the lowest heat transfer rate occurs at the inlet water temperature of 55 °C with a plate variation of 45 holes with a zig-zag hole model. So that the variation of the hole pattern affects the temperature change with the heat transfer rate on the tower performance. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Cooling towers

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