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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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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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Designing Manufacturing Enterprises System for Industry 4.0

Designing Manufacturing Enterprises System for Industry 4.0

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IISE Annual Conference and Expo 2024

作者： Garbie, Ibrahim Garbie, Muhammad Department of Mechanical Engineering Industrial Engineering Program College of Engineering Helwan University Cairo Egypt Department of Industrial Systems and Manufacturing Engineering Texas Tech University LubbockTX United States

ISBN: (纸本)9781713877851

Currently, researchers are concentrating their attention on design for manufacturing, design for assembly, design for cost and design for quality, design for complexity, design for reconfiguration, design for sustainability, and design for X…etc., but they do not mention design manufacturing enterprises system for Industry 4.0. The design manufacturing enterprises system for Industry 4.0 is a systemic approach that simultaneously identifies elements and components for designing manufacturing enterprises for Industry 4.0, taking into consideration the new urgency of adopting Industry 4.0 and the challenges and risk management for implementing Industry 4.0. In this paper, the designing analysis and level will be presented by identifying the relative importance of urgent adoption and the challenges of implementing Industry 4.0. © IISE Annual Conference and Expo *** rights reserved.

关键词： Smart manufacturing

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Analysis of Sandwich Structures with 3D-Printed Kresling Origami Cores

Analysis of Sandwich Structures with 3D-Printed Kresling Ori...

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

作者： Hossain, Md Shahjahan Csercsevits, Vincent Seshaiah, Kira Bateniparvar, Omid Ghosh, Ranajay Department of Mechanical and Aerospace Engineering University of Central Florida OrlandoFL United States Department of Mechanical Engineering Widener University ChesterPA United States Smith College Picker Engineering Program NorthamptonMA United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Lightweight structures with bioinspired metamaterials, with their uniquely engineered properties not found in naturally occurring materials, have garnered significant attention for their potential in various engineering applications. This study explores the mechanical behavior of sandwich plate structures utilizing the Kresling origami pattern, fabricated through a straightforward 3D printing process. By conducting 3-point bending and compression tests, as well as simulations with Abaqus software, the research investigates the distinctive mechanical properties and performance enhancements these origami-inspired structures offer under mechanical loading. This study is noteworthy for being the first to investigate the bending characteristics of sandwich structures utilizing the two cell Kresling pattern or double Kresling, an area that has not been previously explored. Utilizing the Kresling structure in sandwich panels poses a challenge due to its rotational behavior. To address this, we employ a double Kresling pattern, which confines the rotation to the middle layer. This approach ensures that the outer layers remain stable, maintaining the overall integrity of the sandwich panel structure during deformation under mechanical loading. The findings reveal that the 3D-printed Kresling origami core significantly reduces weight while maintaining structural integrity, making it especially beneficial for aerospace engineering, where lightweight yet strong materials are crucial. This research highlights the potential of Kresling-patterned sandwich plates to improve efficiency and performance in supersonic vehicles, providing valuable insights into their structural efficiency and applicability in advanced engineering fields. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Compression testing

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Multi-criteria decision model for selection of a material suitable to lightning strike protection in aerospace applications

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Materials Today: Proceedings 2022年 59卷 725-733页

作者： Himagireesh, Ch. Ramji, K. Durga Prasad, K.G. Hari Kiran, V. Department of Mechanical Engineering Engineering and Technology Program GayatriVidyaParishad College for Degree & P.G.Courses Andhra Pradesh Visakhapatnam India Department of Mechanical Engineering Andhra University Visakhapatnam India Department of Mechanical Engineering Avanthi Institute of Engineering and Technology Andhra Pradesh India

In order to protect the aerospace structures against electromagneticinterference (EMI) caused by lightning strikes, metallic meshes or foils are currently being used. But the additional weight of metallic meshes cause counterbalance of weight saving imparted by the composite materials. In this context, Al6061 hybrid metal matrix composite specimens with different proportions of SiC, Al2O3 and fly ash particulates as reinforcement materials have been prepared and tested their characteristics suitability to lightning strike protection (LSP). As there is a conflicting nature among these properties a multi-criteria decision model using AHP, Entropy and TOPSIS techniques with a view to select appropriate specimen to meet the objective. The results of the proposed decision model are compared with that of the other methods VIKOR and PROMETHEE so as to validate the results. The same weightages for the properties are used in all the three methods. The proposed decision model is the robust one for ranking of the materials. © 2021

关键词： Aluminum oxide

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Wind energy as a source of green hydrogen production in the USA

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Clean Energy 2023年第1期7卷 8-22页

作者： Ashish Sedai Rabin Dhakal Shishir Gautam Bijaya Kumar Sedhain Biraj Singh Thapa Hanna Moussa Suhas Pol National Wind Institute Texas Tech UniversityLubbockTX 79401USA Department of Mechanical Engineering Texas Tech UniversityLubbockTX 79401USA Department of Mechanical Engineering Tribhuvan UniversityPurbanchal CampusDharanNepal Green Hydrogen Lab Department of Mechanical EngineeringKathmandu UniversityDhulikhelNepal Wind Energy Program Texas Tech UniversityLubbockTX 79401USA

The study incorporates an overview of the green hydrogen-production potential from wind energy in the USA,its application in power generation and the scope of substituting grey and blue hydrogen for industrial *** 10 million metric tons of grey and blue hydrogen is produced in the USA annually to fulfil the industrial demand,whereas,for 1 million metric tons of hydrogen generated,13 million metric tons of CO_(2) are released into the *** research aims to provide a state-of-the-art review of the green hydrogen technology value chain and a case study on the production of green hydrogen from an 8-MW wind turbine installed in the southern plain region of *** research estimates that the wind-farm capacity of 130 gigawatt-hours is required to substitute grey and blue hydrogen for fulfilling the current US annual industrial hydrogen demand of 10 million metric *** study investi-gates hydrogen-storage methods and the scope of green hydrogen-based storage facilities for energy produced from a wind *** research focuses on the USA’s potential to meet all its industrial and other hydrogen application requirements through green hydrogen.

关键词： green hydrogen wind energy electrolysis greenhouse gases

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