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arXiv 2023年

作者： Song, Z.M. Zhao, N. Ge, H. Li, T.T. Yang, J. Wang, L. Fu, Y. Zhang, Y.Z. Wang, S.M. Mei, J.W. He, H. Guo, S. Wu, L.S. Sheng, J.M. Department of Physics Southern University of Science and Technology Shenzhen518055 China Department of Chemsitry Southern University of Science and Technology Shenzhen518055 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and Technology Shenzhen518055 China Beijing100190 China International Quantum Academy Shenzhen518048 China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Guangdong Shenzhen518045 China Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen518055 China

We report a detailed study of the magnetic properties of KBaGd(BO3)2, in which magnetic Gd3+ (S = 7/2) ions form into two-dimensional triangular layers. Magnetization, specific heat and magnetocaloric effect (MCE) measurements have been performed on KBaGd(BO3)2 single crystals. The results show that a long-range antiferromagnetic state is established below TN = 0.24 K. In zero fields, only about half of the full entropy is released at TN, indicating that not all the magnetic moments are frozen below the ordering temperature, as expected from the geometrical frustration of the triangular spin lattice. Further studies under external fields were performed down to 50 mK, and the magnetic phase diagrams are established with magnetic fields applied both within and perpendicular to the triangular plane. KBaGd(BO3)2 serves as an example of a two-dimensional triangular lattice with large spin values (S = 7/2) and can be directly compared with the isostructure KBaR(BO3)2 (R = Dy-Yb) family of doublet ground states, which exhibit effective spins of S = 1/2. Copyright © 2023, The Authors. All rights reserved.

关键词： Specific heat

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Corrigendum to “Reduced graphene oxide/hierarchal spinel nickel cobaltite nanoflowers composites for supercapacitor electrodes with ultrahigh capacitive and excellent rate performance” [Ceram. Int. 48(9) (2022) 12460–12466]

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Ceramics International 2022年第13期48卷 19511-19512页

作者： M. Imranullah Tousif Hussain Riaz Ahmad Urooj Shuaib Philips O. Agboola Imran Shakir Centre for Advanced Studies in Physics (CASP) Pakistan Department of Physics GC University Lahore Pakistan College of Engineering Al-Muzahmia Branch King Saud University P.O. BOX 800 Riyadh 11421 Saudi Arabia Department of Materials Science and Engineering University of California Lose Angles USA

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Lower lumbar vertebrae replacement by FEA based assessment of suitable ceramic polymer composites

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materials Today: Proceedings 2023年 90卷 226-233页

作者： Prakriti Prasad Shatakshi Roy Kathan Bhavsar Utkarsh Chadha Tarun Kataray Vezhavendhan R Tolera Kuma Eticha School of Mechanical Engineering (SMEC) Vellore Institute Technology (VIT) Vellore Tamilnadu 632014 India School of Bio Sciences and Technology (SBST) Vellore Institute of Technology (VIT) Vellore Tamilnadu 632014 India Department of Materials Science and Engineering School of Graduate Studies University of Toronto Toronto Ontario M5S 1A1 Canada Department of Biology College of Natural and Computational Sciences Ambo University Ambo Ethiopia

Using bio-materials to develop a safe, secure, and prime substitute as an external entity to interact inside a human environment is a demanding area of research and expertise. The lumbar spine is the most common site for injury in the spinal column as it bears the majority of the human body’s weight while also undergoing significant prolonged loading and stress. In the same direction, a cost-effective Artificial Lumbar vertebra is designed and recognized to be implanted in the spinal region of a body to replace injured or disfigured counterparts. By harnessing the power of 3D bioprinting , biomaterials, and FEA , the paper proves that a simple bio-printed flexible lumbar vertebrae can be integrated into the body to work in conjunction with the rest of the spinal cord just as any other of the vertebrae do, thereby working in coordination with humans. The material thus obtained will be capable of replacing the injuries in the vertebrae caused by mechanical failures like compressive loading, vertebral slip, or vertebral joint fusion. An overall lightweight structure consisting of a firm material is looked forward to for the paper’s fusion. This insight, research, and design have led to the development of the research paper.

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Scientific Machine Learning Framework to Understand Flash Graphene Synthesis

arXiv

引用

arXiv 2023年

作者： Sattari, Kianoosh Eddy, Lucas Beckham, Jacob L. Wyss, Kevin M. Byfield, Richard Qian, Long Tour, James M. Lin, Jian Department of Mechanical and Aerospace Engineering University of Missouri ColumbiaMO65211 United States Department of Chemistry 6100 Main Street HoustonTX77005 United States Applied Physics Program Smalley-Curl Institute 6100 Main Street HoustonTX77005 United States Department of Materials Science and NanoEngineering 6100 Main Street HoustonTX77005 United States Department of Computer Science and Engineering NanoCarbon Center The Welch Institute for Advanced Materials Rice University 6100 Main Street HoustonTX77005 United States

Flash Joule heating (FJH) is a far-from-equilibrium (FFE) processing method for converting low-value carbon-based materials to flash graphene (FG). Despite its promise in scalability and performance, attempts to explore the reaction mechanism have been limited due to complexity involved in the FFE process. Data-driven machine learning (ML) models effectively account for this complexity, but the model training requires considerable amount of experimental data. To tackle this challenge, we constructed a scientific ML (SML) framework trained by using both direct processing variables and indirect, physics-informed variables to predict the FG yield. The indirect variables include current-derived features (final current, maximum current, and charge density) predicted from the proxy ML models and reaction temperatures simulated from multi-physics modeling. With the combined indirect features, the final ML model achieves an average R2 score of 0.81 ± 0.05 and an average RMSE of 12.1% ± 2.0% in predicting the FG yield, which is significantly higher than the model trained without them (R2 of 0.73 ± 0.05 and an RMSE of 14.3% ± 2.0%). Feature importance analysis validates the key roles of these indirect features in determining the reaction outcome. These results illustrate the promise of this SML to elucidate FFE material synthesis outcomes, thus paving a new avenue to processing other datasets from the materials systems involving the same or different FFE processes. Copyright © 2023, The Authors. All rights reserved.

关键词： Graphene

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Effect of Gd3+/Nd3+- dual doped borate glasses on the physical and spectroscopic properties for the NIR emission at 1.069 µm

引用

Optik 2023年第1期290卷

作者： Manyum, P. Rittisut, W. Mool-am-kha, P. Wantana, N. Ruangtaweep, Y. Rujirawat, S. Yimnirun, R. Kidkhunthod, P. Prasatkhetragarn, A. Kothan, S. Kim, H.J. Minh, P.H. Kaewkhao, J. School of Physics and Center of Excellence in High Energy Physics and Astrophysics Suranaree University of Technology Nakhon Ratchasima30000 Thailand Construction Materials Group Engineering Materials Division Department of Science Service Ministry of Higher Education Science Research and Innovation Bangkok10400 Thailand Physics Program Faculty of Science and Technology Nakhon Pathom Rajabhat University Nakhon Pathom 73000 Thailand Center of Excellence in Glass Technology and Materials Science Nakhon Pathom Rajabhat University Nakhon Pathom 73000 Thailand 111 University Avenue Muang Nakhon Ratchasima30000 Thailand Rayong Wangchan21210 Thailand Rayong Wangchan21210 Thailand Applied Science Program School of Science University of Phayao Phayao56000 Thailand Center of Radiation Research and Medical Imaging Department of Radiologic Technology Faculty of Associated Medical Sciences Chiang Mai University Chiang Mai50200 Thailand Department of Physics Kyungpook National University Daegu41566 Korea Republic of Institute of Physics Vietnam Academy of Science and Technology 10 Dao Tan Ba Dinh Hanoi Viet Nam

Near-infrared luminescence properties of dual doped Gd3+/Nd3+-incorporated glasses were manufactured using the melt-quenching technique and characterized by several techniques. The modification in glass structure may be seen in the differences in density, molar volume, and refractive index that occur when the amount of lanthanide oxide in the glass increases. The spectroscopic properties of Nd3+ in these glasses are quite well understood, and the observed optical characteristics may be used to process and eventually determine laser properties. According to the results of XANES, the Nd oxidation state remains the predominant peak for Nd3+ in all of the samples. The transition from 4I9/2 to 4G5/2 +2G7/2 is important for the strongest band in the absorption spectra, which can be seen at 584 nm. The luminescence spectra show peaks caused by 4F3/2→4IJ (J=11/2, 13/2) at three excitation wavelengths of 526, 574 and 805 nm. After the processing, we created glass samples for the study of photoluminescence with various amounts of Nd2O3 incorporated into the best host, 25Li2O-5Al2O3-2.5Gd2O3-(67.5-X)B2O3-XNd2O3. Based on luminescence intensity, it is determined that 1.0 mol% of Nd2O3 is the concentration quenching in the studied glasses. The 4F3/2 →4I11/2 transition at 1069 nm, excited by 526, 578 and 803 nm, has the highest emission intensity. The combined findings of the glasses demonstrate that near-infrared luminescence may be successfully used with them. All of the analysis shows that the dual doped Gd3+/Nd3+ borate glass would be a potential solid-state laser candidate. © 2023 Elsevier GmbH

关键词： Neodymium compounds

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Leveraging Optical Anisotropy of the Morpho Butterfly Wing for Quantitative, Stain-Free, and Contact-Free Assessment of Biological Tissue Microstructures

arXiv

引用

arXiv 2024年

作者： Kirya, Paula Mestre-Farrera, Aida Yang, Jing Poulikakos, Lisa V. Department of Mechanical and Aerospace Engineering Program of Materials Science and Engineering UC San Diego 9500 Gilman Drive La Jolla CA92093 United States Department of Pharmacology Moores Cancer Center UC San Diego 3855 Health Sciences Drive La Jolla CA92093 United States Department of Pediatrics UC San Diego 9500 Gilman Drive La Jolla CA92093 United States

Changes in the density and organization of fibrous biological tissues often accompany the progression of serious diseases ranging from fibrosis to neurodegenerative diseases, heart disease and cancer. However, challenges in cost, complexity, or precision faced by existing imaging methodologies pose barriers to elucidating the role of tissue microstructure in disease. Here, we leverage the intrinsic optical anisotropy of the Morpho butterfly wing and introduce Morpho-Enhanced Polarized Light Microscopy (MorE-PoL), a stain- and contact-free imaging platform which enhances and quantifies the birefringent material properties of fibrous biological tissues. We develop a mathematical model, based on Jones calculus, which quantifies fibrous tissue density and organization. As a representative example, we analyze collagen-dense and collagen-sparse human breast cancer tissue sections and leverage our technique to assess the microstructural properties of distinct regions of interest. We compare our results with conventional Hematoxylin and Eosin (H&E) staining procedures and second harmonic generation (SHG) microscopy for fibrillar collagen detection. Our findings demonstrate that our MorE-PoL technique provides a robust, quantitative, and accessible route toward analyzing biological tissue microstructures, with great potential for application to a broad range of biological materials. Copyright © 2024, The Authors. All rights reserved.

关键词： Collagen

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Intermetallic Nanoparticles on N-Doped Carbon Nanotubes as Multi-Active Catalysts for Oxygen Reduction, Ethanol Oxidation, And Zinc-Air Battery

SSRN

引用

SSRN 2023年

作者： Roy, Nipa Ahmed, Mohammad Shamsuddin Jeon, Seungwon Department of Chemistry Institute of Basic Science Chonnam National University Gwangju500-757 Korea Republic of Department of Physics Yeungnam University Gyeongsan38541 Korea Republic of Department of Materials Science and Engineering Chonnam National University Gwangju61186 Korea Republic of Institute of Energy Studies University of North Dakota Grand ForksND58202 United States

Intermetallic nanomaterials are unique in terms of their band gap, atomic-level arrangement, and well-defined stoichiometry which allows to exhibit significantly enhanced electrocatalytic activity. However, the preparation of durable intermetallic catalysts with a lower content of platinum group metals is challenging, while the lack of control over the loss of active components limits their long-term application due to weak interaction in between support and active sites. Here, we have designed the intermetallic alloyed nanoparticles (NPs) of PdY on N-doped carbon nanotubes (PdY/NCNTs) as a multifunctional catalyst for oxygen reduction reaction (ORR), ethanol oxidation reaction (EOR), and zinc-air battery (ZAB). The strong adhesion through nitrogen ensures the anchoring of PdY NPs onto the NCNTs, which restrains atomic migration and sinter during their conversion to intermetallic phases. This study confirms that there is negligible active site leaching owing to the strong and multiple dative bonds between the NCNTs and PdY NPs. Therefore, it exhibits remarkable catalytic activity resulting in the mass activity of 1317 and 2902 mA at jk and jf for ORR and EOR, respectively, and remains stable for a longer period. Additionally, the PdY/NCNT-containing air cathode fabricated ZAB achieves higher power density (0.236 W cm−2) compared to the benchmark Pt/C. © 2023, The Authors. All rights reserved.

关键词： Carbon nanotubes

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Mathematical modelling and optimization of parameters for Al-Si-Fe aluminum alloy reinforced by Al 2 O 3 and graphite particles using Taguchi method

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materials Today: Proceedings 2021年 44卷 979-986页

作者： Robale Dinsa Daba Devendra Kumar Sinha Habtamu Beri Satyam Shivam Gautam Gulam Mohammed Sayeed Ahmed Ram Sewak Singh Program of Mechanical Design and Manufacturing Engineering School of Mechanical Chemical and Materials Engineering ASTU ADAMA Ethiopia Department of Mechanical Engineering North Eastern Regional Institute of Science and Technology Itanagar India Department of Electronics and Communication School of Electrical Engineering and Computing ASTU ADAMA Ethiopia

In the present scenario the aluminum and its alloys are preferred due to requirement of lightweight high strength material. The present research article interrogates experimentally the study of actual density and porosity using powder metallurgy method. The experimental design is done using Taguchi L 16 orthogonal array. Actual density and porosity has been analyzed based on ‘smaller is best’ basis. Actual density and porosity are calculated using Archimedes principle. The leverage of four levels and five process parameters such as weight percentage of Al 2 O 3 , weight percentage of graphite, compaction pressure, compaction time and milling time are considered. Results reveal that Al 2 O 3 weight percentage has the highest leverage on density followed by compaction time and graphite weight percentage.

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Oxygen-producing composite dressing activated by photothermal and piezoelectric effects for accelerated healing of infected wounds

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Chemical engineering Journal 2023年 476卷

作者： Lai, Yen-Han Roy Barman, Snigdha Ganguly, Anindita Pal, Arnab Yu, Jui-Han Chou, Syun-Hong Huang, E-Wen Lin, Zong-Hong Chen, San-Yuan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Institute of Biomedical Engineering National Tsing Hua University Hsinchu30013 Taiwan Department of Biomedical Engineering National Taiwan University Taipei10617 Taiwan Graduate Institute of Biomedical Science China Medical University Hospital Taichung40400 Taiwan School of Dentistry College of Dental Medicine Kaohsiung Medical University Kaohsiung80708 Taiwan International Intercollegiate Ph.D. Program National Tsing Hua University Hsinchu30013 Taiwan

The process of wound healing is often obstructed by the prevalence of bacterial infection at the wound site. Hence, innovative strategies to alleviate infection is extremely necessary to realize effective wound recovery in a timely manner. Here, we report a self-activated composite dressing consisting of piezoelectric and photothermal functional layers for combating wound infection and provide the desired treatment. The synergistic dressing is functionalized with piezoelectric Poly-L-lactic acid (PLLA) which under the effect of ultrasound irradiation controllably generates reactive oxygen species (ROS) for antibacterial activity, thus facilitating the dressing to inhibit the growth of bacteria at the wound bed. Further, the dressing is modified with calcium peroxide (CaO2) which can effectively convert the generated ROS into molecular oxygen (O2) in presence of catalase enzyme for treating chronic hypoxia in the infected wounds. The sustained generation of O2 by the wound dressing augmented the cell proliferation, migration and tissue regeneration aiding in wound healing. By combining the inherent photothermal activity of reduced graphene oxide (rGO), the synergistic dressing under NIR irradiation enhanced the wound recovery by upregulating the heat shock protein 90 (Hsp90) secretion owing to the heat generation on the wounds. The results obtained demonstrate that the self-triggered multifunctional wound dressing is a promising candidate for clinical treatment of infected wounds with a user-friendly interface. © 2023 Elsevier B.V.

关键词： Ultrasonics

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Micromechanical Origin of Heat Transfer to Granular Flow

arXiv

引用

arXiv 2023年

作者： Zhang, Xintong Adapa, Sarath Feng, Tianshi Zeng, Jian Chung, Ka Man Ho, Clifford Albrecht, Kevin Chen, Renkun Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla CA92093 United States Program in Materials Science and Engineering University of California San Diego La Jolla CA92093 United States Concentrating Solar Technologies Department Sandia National Laboratories 1515 Eubank Blvd. SE AlbuquerqueNM87123 United States

Heat transfer across a granular flow is comprised of two resistances in series: near the wall and within the bulk particle bed, neither of which is well understood due to the lack of experimental probes to separate their respective contribution. Here, we use a frequency modulated photothermal technique to separately quantify the thermal resistances in the near-wall and the bulk bed regions of particles in flowing states. Compared to the stationary state, the flowing leads to a higher near-wall resistance and a lower thermal conductivity of bulk beds. Coupled with discrete element method simulation, we show that the near-wall resistance can be explained by particle diffusion in granular flows. Copyright © 2023, The Authors. All rights reserved.

关键词： Heat resistance

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