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Numerical Analysis of Soliton Propagation in a Tapered Waveguide

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Journal of Optical Communications 2023年第4期44卷 535-538页

作者： raja, M.A. ranathive, S. Sivaram, M. Krishna Kumar, L. Vinoth Kumar, K. Amiri, Iraj S Department of Biomedical Engineering Dr. N.G.P. Institute of Technology Coimbatore India Department of CSE Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Chennai India Department of Computer Networking Lebanese French University Kurdistan Region Erbil Iraq Department of CSE Nehru Institute of Engineering & Technology Coimbatore India Department of EEE Karunya Institute of Technology and Sciences Coimbatore India Computational Optics Research Group Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Viet Nam

In this paper, dispersion decreased profiled tapered fiber is designed whose dispersion characteristics and soliton propagation is investigated numerically using darboux transformation. The result reveals that solitons pulse gets compression as it propagates along the length of the tapered region. © 2019 Walter de Gruyter GmbH, Berlin/Boston.

关键词： dispersion (waves)

A Cost-Effective Onboard Hydrogen Production Method Utilizing Hydrolysis of Al-Bi-Fe Alloy

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SSrN 2024年

作者： deng, rui Wang, Mingshuai Zhang, Hao Yao, ruijun Zheng, Kai Wang, Cuiping Liu, Xingjun College of Materials Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials Xiamen University Xiamen361005 China School of Materials Science and Engineering Harbin Institute of Technology Shenzhen518055 China Shenzhen R&D Center for Al-Based Hydrogen Hydrolysis Materials Shenzhen518055 China Xiamen Key Laboratory of High Performance Metals and Materials Xiamen University Xiamen361005 China

Leveraging the liquid phase immiscibility effect and phase diagram calculations, a sequence of alloy powders with varying Fe content was designed and fabricated utilizing gas atomization method. Microstructural characterizations, employing SEM, EdS, and Xrd analyses, revealed the successful formation of incomplete shell on the surfaces of Al-Bi-Fe powders, obviating the need for Sn doping. The study systematically investigates the influence of Fe doping on the microstructure and hydrolysis performance of these alloys in deionized water. Notably, Al-10Bi-7Fe exhibited the highest hydrogen production, reaching 961.0 Nml/g, while Al-10Bi-10Fe demonstrated the peak conversion rate at 92.99%. The hydrolysis activation energy of each Al-Bi-Fe alloy powder was calculated using the Arrhenius equation, indicating a reduction in activation energy achieved through Fe doping. © 2024, The Authors. All rights reserved.

关键词： Hydrolysis

design and Manufacture of a Bio-Based Functional Composite with Antibacterial, Antioxidant, and Improved Mechanical Properties Modified Poly (Butylene Adipate-Co-Terephthalate) (Pbat) by Curcumin and Maleic Anhydride

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SSrN 2024年

作者： Wu, Xiaokai Shu, dingbo Huang, Shaowen Yang, Chunping Li, Bo Huang, Shengnan Li, Juan Yin, Xiaogang College of Chemaretry and Materials Science Guizhou Normal University Guiyang550025 China R&D Department Guizhou Material Industrial Technology Institute Guiyang550014 China College of Materials and Metallurgy Guizhou University Guiyang550025 China Guizhou Academy of Testing and Analysis Guiyang550014 China

PBAT are popular because of its low cost, good biodegradability, and mechanical qualities. Maleic anhydride (SMA) can easily graft curcumin (CUr), which possesses antibacterial and antioxidant characteraretics, with a nucleating agent action and high darepersibility, resulting in the successful production of the functional modifier CUr-SMA. Thare study create PBAT composite films with various weight percentages of CUr-SMA (0.1, 0.3, 0.5, 0.7, and 0.9% w/w) using extrusion and blow molding techniques. Thare study chemically link CUr and SMA to create a robust and tight composite material. Thare study investigate the structure, mechanics, water vapor barrier capabilities, antibacterial and antioxidant properties, and fresh-keeping impact of the film. The composite exhibits an excellent composite effect, superior to that of single component blends, minimizes CUr-SMA migration, improves mechanical properties, and increases the barrier characteraretics of composite films. CUr-SMA and PBAT interact to produce a cross-linked network structure via chain extension reactions. Tensile strength increases by 56%, from 17.5 MPa to 27.3 MPa. The antioxidant activity are up to 72.26 percent. It possesses significant antibacterial properties against Staphylococcus aureus. PBAT/CUr-SMA films successfully enhance the shelf life of oyster mushrooms, strawberries, and apples due to their strong antioxidant, antibacterial, and waterproof qualities. © 2024, The Authors. All rights reserved.

关键词： Antioxidants

Influence of Crosslink density on the Interfacial Bonding Performance for Epoxy resin Towards Load-Induced Calcium Silicate Hydrate Gel

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SSrN 2023年

作者： Sun, dawei Wang, Jiaxin Wang, Hui Yan, Zheng Ma, Wenxu Ma, Xiaoyu Wang, Yali Ma, Zhongcheng Jin, Xiaodong Sun, Shibing Cui, Suping Wang, Zhiyong College of Materials Science and Engineering Beijing University of Technology Beijing100124 China State Key Laboratory of Solid Waste Reuse for Building Materials Beijing Building Materials Academy of Sciences Research Beijing100041 China Key Technologies R&D Program CNBM China

In epoxy-amine based self-healing cement-based materials, the uncontrollable stoichiometric ratio of both components in the cracks leads to the cured epoxy resin with various crosslink densities. Investigate the interaction mechanism between cured epoxy resin and C-S-H gel help us to optimize the final self-healing performances. In this work, the interaction between load-induced broken panels of C-S-H gel and cured epoxy resins with different crosslink densities (e.g., 0.23, 0.77, and 0.97) was studied through molecular dynamic methods. It was found that crosslink density plays an essential role in the geometrical size and atom distributions. Phase separation occurs at the low crosslink density due to the aggregation of amine molecules. The generation of fresh crosslink points limits the free motion of epoxy molecules with higher crosslink density. Meanwhile, the cured epoxy resin with higher crosslink density causes a high porosity in the interfacial region between the epoxy resin and C-S-H gel substrates. © 2023, The Authors. All rights reserved.

关键词： Epoxy resins

Microstructure evolution and mechanical behavior of Fe-Mn-Al-C low-density steel upon aging

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arXiv

arXiv 2023年

作者： Banis, Alexandros Gomez, Andrea Bliznuk, Vitaliy dutta, Aniruddha Sabirov, Ilchat Petrov, roumen H. Department of Electromechanical Systems and Metal Engineering Ghent University Ghent Belgium IMDEA Materials Institute Getafe Madrid Spain ArcelorMittal Global R&D Ghent Belgium Department of Materials Science and Engineering Delft University of Technology Delft Netherlands

This study focuses on the microstructure's evolution upon different aging conditions of a high-strength low-density steel with a composition of Fe-28Mn-9Al-1C. The steel is hot rolled, subsequently quenched without any solution treatment, and then aged under different conditions. The microstructure of the samples was studied by means of Scanning Electron Microscopy, Electron Backscatter diffraction, and Transmission Electron Microscopy. The aging treatment leads to the formation of an ordered face-centered cubic L12 phase named κcarbide. This study aims to characterize the formation and growth of these κ-carbides qualitatively and quantitatively under different aging conditions. Then, an effort is made to relate the fraction and size of this phase with the tensile properties of the steel to determine the optimal aging conditions that will lead to a good combination of strength and ductility. It has been found that the κ-carbides start to form intragranularly through concentration fluctuations of aluminum and manganese inside the austenite grain. Then, with the process of spinodal decomposition, they grow in size coherently with the matrix. during this process, the strength and hardness of the steel increase while maintaining a relatively high elongation. The best combination of high strength and ductility was achieved at the aging condition of 8 h at 550 °C with an ultimate tensile strength up to 1157 MPa and total elongation of 51%. Increasing the aging temperature and time, κ-carbides start to form intergranularly, lose their coherency with the matrix and severely compromise the hardness and strength. The shearing of the carbides during deformation is also studied. © 2023, CC BY-NC-Nd.

关键词： Scanning electron microscopy

Mn_(x)Cr_(0.3)Fe_(0.5)Co_(0.2)Ni_(0.5)Al_(0.3)high entropy alloys for magnetocaloric refrigeration near room temperature

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Journal of materials Science & technology 2021年第20期79卷 15-20页

作者： Zhihua dong Shuo Huang Valter Ström Guocai Chai Lajos Károly Varga Olle Eriksson Levente Vitos Applied Materials Physics Department of Materials Science and EngineeringKTH-Royal Institute of TechnologyStockholm SE-10044Sweden College of Materials Science and Engineering Chongqing UniversityChongqing 400030China Department of Physics and Astronomy Division of Materials TheoryUppsala UniversityUppsala SE-75121Sweden Department of Materials Science and Engineering KTH-Royal Institute of TechnologyStockholm SE-10044Sweden Division of Engineering Materials Department of Management and EngineeringLinköping UniversityLinköping SE-58183Sweden AB Sandvik Materials Technology R&D Center Sandviken SE-81181Sweden School of Science and Technology Örebro UniversityÖrebro SE-70281Sweden Research Institute for Solid State Physics and Optics Wigner Research Center for PhysicsP.O.Box 49H-1525 BudapestHungary

High entropy alloys(HEAs)based on transition metals display rich magnetic characteristics,however attempts on their application in energy efficient technologies remain ***,we explore the magnetocaloric application for a series of Mn_(x)Cr_(0.3)Fe_(0.5)Co_(0.2)Ni_(0.5)Al_(0.3)(0.8rated theoretical and experimental *** theory and experiment indicate the designed HEAs have the Curie temperature close to room temperature and is tunable with Mn concentration.A non-monotonic evolution is observed for both the entropy change and the relative cooling power with changing Mn *** underlying atomic mechanism is found to primarily emerge from the complex impact of Mn on *** magnetocaloric properties can be achieved by tuning Mn concentration in combination with controlling structural phase stability for the designed HEAs.

关键词： High entropy alloys Magnetocaloric materials Magnetic phase transition Experiment and Ab initio

Mechanistic Modeling of Continuous radial Flow Chromatography for Capture Step Purification of Biosimilar Monoclonal Antibody Therapeutic

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SSrN 2024年

作者： deulgaonkar, Prashant Nadeem, Mohd rana, Sunil Mahajani, Sanjay Tiwari, Sanjay Bhambure, rahul Chemical Engineering and Process Development Division CSIR-National Chemical Laboratory Pune411008 India Ghaziabad201002 India Indian Institute of Technology Bombay Mumbai400076 India Biotechnology R&D Lupin Limited Pune412115 India

We demonstrate use of mechanistic modeling assisted designing of scalable and efficient continuous multicolumn radial Protein A chromatography based purification step for biosimilar monoclonal antibody therapeutic. Protein A chromatography using continuous multicolumn chromatography has several benefits, including reduced buffer use, increased productivity, and small footprint. Productivity and capacity utilization (CU) of the continuous radial CaptureSMB process under varying operating conditions was predicted using the general rate mechanistic model framework and validated with the experimental results. Effect of critical process parameters like mAb feed concentration (c0), loading breakthrough % (s), and residence time (rT) on productivity and capacity utilization of radial flow continuous Protein A chromatography were evaluated. Model predictions were validated using the experimental results proving the reliability and feasibility of the modeling approach. At 3.00±0.20 mg/mL feed model mAb concentration, the model-based approach predicts 20.33 g/L/h productivity (rT= 2 minute, s=80%) using MabSelect™ PrismA resin. By conducting the continuous CaptureSMB experiment under the same operating conditions, this productivity forecast was verified experimentally and found to be 20.45 g/L/h. The results demonstrate the use of mechanistic modeling framework to predict the performance of continuous radial flow CaptureSMB chromatography for biosimilar monoclonal antibody therapeutic purification. © 2024, The Authors. All rights reserved.

关键词： radial flow

Advanced Hardware-In-The-Loop System for Guidance and Navigation Control Systems of Autonomous Underwater Vehicle

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Advanced Hardware-In-The-Loop System for Guidance and Naviga...

OCEANS

作者： Moon Hwan Kim Teasuk Yoo Kyungwon Nam Dept. of EE Engineering Yonsei University Seoul South Korea Maritime R&D Center LIG Nex1 Seongnam South Korea Agency for Defense Development Maritime Technology Research Institute Jinhae South Korea

ISBN: (数字)9798350362077

ISBN: (纸本)9798350362084

The integration of hardware and software, specifically the Guidance and Navigation Control (GNC) system, is cru-cial for achieving underwater positioning in autonomous systems like Autonomous Underwater Vehicles (AUVs). In our study, we present a novel Hardware-in-the-Loop System (HILS) framework that differs from traditional component-based approaches. This framework enables real-time interaction with the GNC loop, incorporates GPS simulation to enhance navigation accuracy, and utilizes an inertial measurement unit(IMU) and a Flight Motion Simulator (FMS) to capture real-time attitude dynamics. By connecting to a real-Time Computer, it effectively communicates with the AUV's GNC loop, taking into consideration actuator latency. Our experiments demonstrate the system's precision and dependability, establishing it as an innovative tool for AUV research and setting a precedent for future advancements.

关键词： Autonomous underwater vehicles Frequency modulation Three-dimensional displays Navigation Control systems real-time systems Software

design and Evaluation of an AUV with dual Acoustic Communication Modems

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Design and Evaluation of an AUV with Dual Acoustic Communica...

OCEANS

作者： Moon Hwan Kim Taesuk Yoo Yoonho Jeon Hyungi Jung Dept. E.E Engineering Yonsei University Seoul South Korea LIG Nexl Maritime R&D Center Seongnam South Korea Maritime Technology Research Institute Agency for Defense Development Jinhae South Korea

ISBN: (数字)9798350362077

ISBN: (纸本)9798350362084

In this paper, a method for designing and fabricating an autonomous underwater vehicle (AUV) with a dual Acoustic Communication Modem is presented. The aim is to ensure reli-able communication in challenging underwater environments. To achieve this, the AUV incorporates two underwater communication modems that use the FKS-FH and PSK-OFdM methods. The proposed AUV also includes a combined inertial measurement unit (IMU) and doppler velocity log (dVL) navigation system, as well as a non-linear controller. These features enable stable navigation and the collection of topographical information from the seabed. real-world sea trials were conducted to validate the AUV's performance in terms of precise control, stability, underwater communication, and navigation. The success rate and maximum communication distance of the underwater communication system were calculated. Furthermore, real-field tests were carried out to confirm the system's reliable underwater commu-nication and navigation capabilities. The successful integration of advanced navigation systems and underwater communication technologies into the AUV demonstrates its potential for complex marine tasks and operations.

关键词： Underwater communication Sea surface Measurement units Navigation Acoustic communication (telecommunication) Inertial navigation Modems