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Comparison of CMAS corrosion and sintering induced microstructural characteristics of APS thermal barrier coatings

Journal of Materials Science & Technology 2019年第3期35卷 440-447页

作者： Yiyou Wu Hua Luo Canying Cai Yanguo Wang Yichun Zhou Li Yang Guangwen Zhou School of Materials Science and Engineering Xiangtan University Key Laboratory of Low Dimensional Materials & Application Technology of Ministry of Education Xiangtan University Department of Mechanical Engineering & Materials Science and Engineering Program State University of New York at Binghamton

The microstructural features of high-temperature sintered and CaO-MgO-Al_2O_3-SiO_2(CMAS) corroded air plasma sprayed Y_2O_3 stabilized ZrO_2(YSZ) thermal barrier coatings(TBCs) under the thermal gradient condition were comparatively studied. As-sprayed YSZ has a lamellar structure and the lamellae are composed of closely aligned columnar crystals. The sintered and the CMAS corroded YSZ coatings maintain the t'-ZrO_2 phase as the as-sprayed YSZ coating. The sintered YSZ remains the lamellar structure with reduced interlamellar gaps and grains coarsening. After the CMAS corrosion, the top layer of the YSZ coating keeps its lamellar structure consisting of some columnar grains with the CMAS infiltration into the intergrain gaps and the formation of striped Zr_2Y_2 O_7. The typical lamellar structure transforms into more equiaxed grains in the middle and bottom layers of the ceramic coating along with significant infiltration of amorphous CMAS and anorthite formation in the bottom layer owing to the high contents of Ca and Al.

关键词： YSZ thermal barrier coating APS CMAS corrosion Anorthite

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Using tracheal breathing sounds and anthropometric information for screening obstructive sleep apnoea during wakefulness

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Journal of Medical engineering and Technology 2019年第2期43卷 111-123页

作者： Elwali, Ahmed Meza-Vargas, Sonia Moussavi, Zahra Biomedical Engineering Program University of Manitoba Winnipeg Canada Respirology Department University of Manitoba Winnipeg Canada Electrical and Computer Engineering Department University of Manitoba Winnipeg Canada

Obstructive sleep apnoea (OSA) is a common yet underdiagnosed disorder. Undiagnosed OSA significantly increases perioperative morbidity and mortality for OSA patients undergoing surgery, requiring full anaesthesia. Tracheal breathing sounds characteristics during wakefulness have shown a high correlation with the apnoea–hypopnea index (AHI), while they are also affected by the anthropometric parameters, e.g., sex, age, etc. This study investigates the effects of the anthropometric parameters on our new quick objective OSA screening tool during wakefulness. Breathing sounds of 122 individuals (71 with AHI 15 as OSA) were recorded during wakefulness in the supine position. The spectra and bi-spectra of 81 (47 non-OSA) individuals’ signals, which were randomly selected, were analysed as a training dataset to extract the most significant features with the lowest sensitivity to the anthropometric parameters. Using a support vector machine (SVM) classifier, these features resulted in 72.1, 64.7 and 77.5% testing classification accuracy, sensitivity and specificity, respectively. We also investigated classifying subjects into subgroups related to each anthropometric parameter and incorporating a voting procedure. This routine resulted in 83.6, 74.5 and 90.1% testing classification accuracy, sensitivity and specificity, respectively. In conclusion, it is possible to positively utilise the anthropometric information to enhance the classification accuracy for a reliable OSA screening procedure during wakefulness. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Classification (of information)

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Detection and severity classification of COVID-19 in CT images using deep learning

arXiv

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arXiv 2021年

作者： Qiblawey, Yazan Tahir, Anas Chowdhury, Muhammad E.H. Khandakar, Amith Kiranyaz, Serkan Rahman, Tawsifur Ibtehaz, Nabil Mahmud, Sakib Al-Madeed, Somaya Musharavati, Farayi Department of Electrical Engineering Qatar University Doha2713 Qatar Department of Biomedical Physics & Technology University of Dhaka Dhaka1000 Bangladesh Department of Computer Science and Engineering Bangladesh University of Engineering and Technology Dhaka1205 Bangladesh Department of Computer Science and Engineering Qatar University Doha2713 Qatar Mechanical & Industrial Engineering Department Qatar University Doha2713 Qatar

Since the breakout of coronavirus disease (COVID-19), the computer-aided diagnosis has become a necessity to prevent the spread of the virus. Detecting COVID-19 at an early stage is essential to reduce the mortality risk of the patients. In this study, a cascaded system is proposed to segment the lung, detect, localize, and quantify COVID-19 infections from computed tomography (CT) images Furthermore, the system classifies the severity of COVID-19 as mild, moderate, severe, or critical based on the percentage of infected lungs. An extensive set of experiments were performed using state-of-the-art deep Encoder-Decoder Convolutional Neural Networks (ED-CNNs), UNet, and Feature Pyramid Network (FPN), with different backbone (encoder) structures using the variants of DenseNet and ResNet. The conducted experiments showed the best performance for lung region segmentation with Dice Similarity Coefficient (DSC) of 97.19% and Intersection over Union (IoU) of 95.10% using U-Net model with the DenseNet 161 encoder. Furthermore, the proposed system achieved an elegant performance for COVID-19 infection segmentation with a DSC of 94.13% and IoU of 91.85% using the FPN model with the DenseNet201 encoder. The achieved performance is significantly superior to previous methods for COVID-19 lesion localization. Besides, the proposed system can reliably localize infection of various shapes and sizes, especially small infection regions, which are rarely considered in recent studies. Moreover, the proposed system achieved high COVID-19 detection performance with 99.64% sensitivity and 98.72% specificity. Finally, the system was able to discriminate between different severity levels of COVID-19 infection over a dataset of 1,110 subjects with sensitivity values of 98.3%, 71.2%, 77.8%, and 100% for mild, moderate, severe, and critical infections, respectively. Copyright © 2021, The Authors. All rights reserved.

关键词： Computer aided diagnosis

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Reconfigurable Assembly of Chiral Metamaterials on Solid Substrates

Reconfigurable Assembly of Chiral Metamaterials on Solid Sub...

引用

Novel Optical Materials and Applications, NOMA 2020

作者： Li, Jingang Zheng, Yuebing Materials Science and Engineering Program and Texas Materials Institute University of Texas at Austin AustinTX78712 United States Department of Mechanical Engineering University of Texas at Austin AustinTX78712 United States

We report an all-optical approach to build colloids into active chiral nanostructures on a solid substrate, where the chiroptical response can be tailored on-demand. © 2020 OSA - The Optical Society. All rights r... 详细信息

ISBN: (纸本)9781943580798

关键词： Substrates

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Clustering polycystic ovary syndrome laboratory results extracted from a large internet forum with machine learning

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Intelligence-Based Medicine 2024年 9卷 100135-100135页

作者： Emanuel, Rebecca H.K. Docherty, Paul D. Lunt, Helen Murray, Rua Campbell, Rebecca E. Department of Mechanical Engineering University of Canterbury Christchurch New Zealand Institute for Technical Medicine Furtwangen University Villingen-Schwenningen Germany Diabetes Services Health New Zealand Canterbury New Zealand School of Mathematics and Statistics University of Canterbury Christchurch New Zealand School of Biomedical Sciences Department of Physiology Centre for Neuroendocrinology University of Otago Dunedin New Zealand

Background: Polycystic Ovary Syndrome (PCOS) is reported to affect between 4% and 21% of reproductive aged people with ovaries. It is a heterogeneous condition with a lack of established phenotypes that address the range of reproductive and metabolic features present in PCOS. These reproductive and metabolic features may result in patients undergoing a variety of relevant laboratory tests. Previous work has led to the gathering of laboratory test results from a PCOS specific forum, hosted on a website called reddit. Objectives: In this paper, laboratory results and body mass index (BMI) posted on the PCOS reddit forum were clustered to show the usefulness of the PCOS forum for PCOS research and validate existing PCOS phenotypes or discover other appropriate phenotypes. Methods and results: Over 1500 sets of PCOS-related reddit laboratory test results and BMIs were clustered using nearest neighbour imputation and K-means clustering. However, only non-imputed data was included in the final clusters. Kernel Density Estimation plots were used to display the distinct clusters. The clustered test results suggested the existence of distinct metabolic and reproductive phenotypes, as well as a group displaying mild features of both types of dysregulations and a group skewed towards normal results. It was also possible to separate the groups further into distinct hypothyroid groups within the mixed dysregulation group and to separate insulin resistant and diabetes-like groups within the metabolic group. Conclusions: This research further validates the usefulness of exploring alternate data sources in the age of the internet and machine learning. The reddit clusters reinforced the existing notion that people with PCOS can be separated into a primarily metabolic pathology group, a primarily reproductive pathology group and an in between group with pathology in both domains. © 2024 The Authors

关键词： Clustering Internet research Machine learning PCOS

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Cubic Phase Metasurface for Three-Dimensional Optical Manipulation

Cubic Phase Metasurface for Three-Dimensional Optical Manipu...

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Frontiers in Optics + Laser Science 2021, FiO+LS 2021 - Part of Frontiers in Optics, FiO 2021

作者： Kuo, Hsin Yu Hsu, Hung-Chuan Vyas, Sunil Chu, Cheng Hung Chen, Mu Ku Shi, Xu Misawa, Hiroaki Lu, Yu-Jung Luo, Yuan Tsai, Din Ping Department of Physics National Taiwan University Taipei10617 Taiwan Research Center for Applied Sciences Academia Sinica Taipei11529 Taiwan Institute of Medical Device and Imaging National Taiwan University Taipei10051 Taiwan Department of Mechanical Engineering National Taiwan University Taipei10617 Taiwan Department of Electronic and Information Engineering The Hong Kong Polytechnic University 999077 Hong Kong Research Institute for Electronic Science Hokkaido University Sapporo001-0021 Japan YongLin Institute of Health National Taiwan University Taipei10672 Taiwan Department of Biomedical Engineering National Taiwan University Taipei10051 Taiwan

ISBN: (纸本)9781557528209

The optical tweezer is one of the important technique for contactless manipulation in biology to manipulate the motion of miniature objects. Here we design and fabricate the dielectric cubic phase metasurface to generate a polarization-independent Airy beam in visible. Moreover, the metasurface is integrated within the optical manipulation system and used to manipulate particles. Frontiers in Optics / Laser Science © Optica Publishing Group 2021.

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Investigation and Analysis of Green Refrigerant Zero ODP as an Alternative Refrigerant Lower Cost and GWP

Research Square

引用

Research Square 2021年

作者： Saengsikhiao, Piyanut Taweekun, Juntakan Maliwan, Kittinan Energy Technology Program Faculty of Engineering Prince of Songkla University Songkhla Hat Yai90112 Thailand Department of Mechanical and Mechatronics Engineering Faculty of Engineering Prince of Songkla University Songkhla Hat Yai90112 Thailand

This research presents the development of hydrocarbon refrigerant mixture in hydrofluorocarbon blend, a non-flammable refrigerant that was retrofitted to replace R22. The properties of all refrigerant, as analyzed using national institute of standards and technology (NIST) reference fluid thermodynamic and transport properties database (REFPROP) software and NIST vapor compression cycle model accounting for refrigerant thermodynamic and transport properties (CYCLE_D-HX) software, are in accordance with the CAN/ANSI/AHRI540 standards of the Air-Conditioning, Heating, and Refrigeration Institute (AHRI). The results of this research showed. The cooling coefficient of performance (COPc) of R453A was nearly R22 at all condition with zero ODP. The R453A can be retrofitted to replace R22A due to its composition of POE, Class A1 incombustibility, and lower toxicity. R453A is another alternate refrigerant option that is composed of 1.2% hydrocarbon (HCs) R600 (0.6%) and R601a (0.6%), and is consistent with the evolution of fourth-generation refrigerants that contain a mixture of HFCs, HFOs, HCs, and natural refrigerants, which are required to produce a low-GWP, zero-ozone-depletion-potential (ODP), high-capacity, low-operating-pressure, and nontoxic refrigerant. © 2021, CC BY.

关键词： Refrigerants

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Quasi-static perforation of the ceramic foam core sandwich panels impregnated with Newtonian and non-Newtonian fluids

arXiv

引用

arXiv 2021年

作者： Afrouzian, Ali Pouryazdian, Salman Liaghat, GolamHossein Bahramian, AhmadReza W. M. Keck Biomedical Materials Research Lab School of Mechanical and Materials Engineering Washington State University PullmanWA99164 United States School of Mechanical Engineering Tarbiat Modares University Tehran Iran Polymer Engineering Department Faculty of Chemical Engineering Tarbiat Modares University Tehran Iran School of Mechanical and Automotive Engineering Kingston University London London United Kingdom

In this research, mechanical response and energy absorption of ceramic foam sandwich panels filled with Newtonian and non-Newtonian fluid subjected to quasi-static indentation loads were investigated experimentally. In addition, the effects of number of face-sheet layers (face-sheet thickness) and boundary conditions on the mechanical response and energy absorption of sandwich panels were discussed. Sandwich panels consisted of two glass/epoxy face-sheets with different thicknesses (4 and 8 layers) and an open cell ceramic foam core. This foam saturated with Newtonian (Glycerol) and non-Newtonian (mixture of Ethylene glycol and Aerosil) fluids. Sandwich panels were tested in two different kinds of supporting conditions, simply-supported and fully fixed (clamped). Results showed that damage area in neat composite and STF filled sandwich panels are much higher than the glycerol filled foam core sandwich panels. Also, STF saturated sandwich panels absorbed higher energy compared with two other type of sandwich panels during quasi-static punch shear test. © 2021, CC BY.

关键词： Rheology

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A Biphasic Liquid System for Low-Power Optothermal Bubble Generation and Enhanced Surface Binding of Proteins

A Biphasic Liquid System for Low-Power Optothermal Bubble Ge...

引用

Novel Optical Materials and Applications, NOMA 2020

作者： Kim, Youngsun Zheng, Yuebing Materials Science and Engineering Program and Texas Materials Institute University of Texas at Austin AustinTX78712 United States Department of Mechanical Engineering University of Texas at Austin AustinTX78712 United States

A perfluoropentane-in-water biphasic system, capable of optothermally generating microbubbles at low power, enhanced surface binding of protein by the bulk-To-surface concentration with minimal loss in its activity. &... 详细信息

ISBN: (纸本)9781943580798

关键词： Proteins

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Oscillation Quenching in Stuart-Landau Oscillators via Dissimilar Repulsive Coupling

arXiv

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arXiv 2022年

作者： Dutta, Subhasanket Alamoudi, Omar Vakilna, Yash Shashank Pati, Sandipan Jalan, Sarika Complex Systems Lab Department of Physics Indian Institute of Technology Indore Khandwa Road Indore Simrol453552 India Texas Institute for Restorative Neurotechnologies The University of Texas Health Science Center at Houston HoustonTX77225 United States Department of Biosciences and Biomedical Engineering Indian Institute of Technology Indore Khandwa Road Simrol Indore453552 India Biomedical Engineering Program King Abdulaziz University Jeddah Saudi Arabia

Quenching of oscillations, namely amplitude and oscillations death, is an emerging phenomenon exhibited by many real-world complex systems. Here, we introduce a scheme that combines dissimilar couplings and repulsive feedback links for the interactions of Stuart Landau oscillators and analytically derive the conditions required for the amplitude death. Importantly, this analysis is independent of the network size, presents a generalized approach to calculate the stability conditions for various different coupling schemes, and befits for non-identical oscillators as well. Last, we discuss the similarities of the quenching of oscillations phenomenon with the postictal generalized EEG suppression in convulsive seizures. Copyright © 2022, The Authors. All rights reserved.

关键词： Quenching

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