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4th International Conference on Advanced Materials and Modern Manufacturing, ICAMMM 2021

作者： Kumar, Gorlea Thrinadh Ananthvenkata Tarun Singh, Shalini Shukla, Ashish Resnina, N. Belyaev, S. Palani, I.A. Paul, C.P. Mechatronics and Instrumentation Lab Discipline of Mechanical Engineering Indian Institute of Technology Indore Madhya Pradesh Indore453552 India Saint-Petersburg State University Saint-Petersburg199034 Russia Laser Technology Division Raja Ramanna Centre for Advanced Technology Madhya Pradesh Indore452012 India Homi Bhabha National Institute Maharashtra Anushaktinagar Mumbai400094 India

ISBN: (纸本)9789811902437

Wire arc additive manufacturing (WAAM) is one of the metal additive manufacturing methods in which rapid fabrication is possible for components of big size. A significant amount of heat energy is transferred to the workpiece during this process, with a defined idle period so that the workpiece cools down between each layer of deposition. This variable cooling rate technique keeps the workpiece from collapsing and crack growth by maintaining a proper inter-pass temperature. The main challenge is to choose an inter-pass ambient cooling time to mitigate the residual stresses and distortions induced in the workpiece. A numerical model is developed to study the variation of residual stress with respect to change in the cooling time of WAAM process. The material’s thermal and mechanical behaviour was instigated using finite element analysis, by introducing DFLUX SUBROUTINE within ABAQUS 6.20 SOFTWARE. The simulation results were analyzed and the optimum inter-pass cooling time obtained was 800 sec. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Distortions Goldak heat source Residual stress WAAM

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Advection and Thermal Diode

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Chinese Physics Letters 2021年第3期38卷 22-28页

作者： Ying Li Jiaxin Li Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationCollege of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab of Advanced Micro/Nano Electronic Devices&Smart Systems of ZhejiangZhejiang UniversityHangzhou 310027China International Joint Innovation Center Zhejiang UniversityHaining 314400China School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001China

We prove that under the condition of closed boundary to mass flux, pure advection is not a valid mechanism to make a practical thermal diode. Among the various designs of thermal diodes, many of them involve circulating fluid flow, such as in thermosyphons. However, those designs often employ natural convection, which is basically a nonlinear process. It thus remains unclear how the pure advection of temperature field induced by a decoupled velocity field influences the symmetry of heat transfer. Here we study three typical models with pure advection:one with open boundary, one with closed boundary at unsteady state, and one with closed boundary at steady state. It is shown that only the last model is practical, while it cannot become a thermal diode. Finally, a general proof is given for our claim by analyzing the diffusive reciprocity.

关键词： process. state. boundary

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MLAR-Net: A multilevel attention-based ResNet module for the automated recognition of emotions using single-channel EEG signals

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IEEE Access 2025年 13卷 99122-99144页

作者： Maithri, M. Raghavendra, U. Gudigar, Anjan Kumar Praharaj, Samir Sriram, Karthikeyan Salvi, Massimo Hong Yeong, Chai Molinari, Filippo Rajendra Acharya, U. Manipal Academy of Higher Education Manipal Institute of Technology Department of Mechatronics Manipal 576104 India Manipal Academy of Higher Education Manipal Institute of Technology Department of Instrumentation and Control Engineering Karnataka Manipal 576104 India Taylor’s University School of Medicine Faculty of Health and Medical Sciences Digital Health and Medical Advancement Impact Laboratory Subang Jaya 47500 Malaysia Kasturba Medical College Manipal Academy of Higher Education Department of Psychiatry Manipal Karnataka Manipal 576104 India Manipal Academy of Higher Education Manipal Institute of Technology Department of Electrical & Electronics Engineering Karnataka Manipal 576104 India Politecnico di Torino Biolab PoliToBIOMed Lab Department of Electronics and Telecommunications Corso Duca degli Abruzzi 24 Turin 10129 Italy University of Southern Queensland School of Mathematics Physics and Computing Springfield Australia University of Southern Queensland Centre for Health Research Australia

Human emotion recognition is important as it finds applications in multiple domains such as medicine, entertainment, and military. However, accurately identifying emotions remains challenging due to humans’ ability to hide or suppress their emotional expressions. Hence it becomes important to recognize emotions by using brain signals as they provide more reliable data. Brain signals can be captured using Electroencephalograms (EEG) electrodes. Most used EEG devices come with multiple channels. However, not all channel information is important for emotion recognition. Another issue with the existing dataset is the availability of a small quantity of samples. To address these challenges, we propose MLAR-Net, a novel multilevel attention module for emotion recognition using single-channel EEG signals. Our approach converts EEG signals into spectrograms using multiple parameters to generate a large set of images. This data is then processed through our proposed MLAR-Net, which integrates a multilevel attention module with ResNet18 architecture. Our study identifies channel number 24 (T7) as the most effective for emotion classification, achieving an average accuracy of 98.06% using a cubic support vector machine and a maximum accuracy of 99.51% using fine K-Nearest Neighbors. The study was conducted using the SEED dataset. It is a publicly available dataset developed by capturing EEG signals from fifteen subjects for three classes of emotions, namely positive, negative, and neutral. The results achieved by the proposed study show an improvement of around 4 to 5% compared to state-of-the-art studies using the same channel. This performance surpasses existing state-of-the-art methods for single-channel EEG-based emotion recognition. Furthermore, we highlight the top-performing channels that can be used for real-time implementation of the system with a minimum number of channels. © 2013 IEEE.

关键词： attention-based ResNet Emotion recognition explainable AI single-channel EEG spectrograms

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Laser-induced graphene-Embedded electrospun PVDF-ZnO: A synergistic piezo-tribo nanogenerator for efficient energy harvesting

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Carbon 2025年 243卷

作者： Divya Chauhan Arpit Kumar Singh Sabatini Tyagi Palani Iyamperumal Anand Seeram Ramakrishna Manish Kumar Srivastava Department of Physical Sciences Banasthali Vidyapith Rajasthan 304022 India Mechatronics and Instrumentation Engineering Lab Indian Institute of Technology Indore 452020 India Department of Mechanical Engineering College of Design and Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore

This study presents development and performance evaluation of piezo-triboelectric hybrid nanogenerators (PTENGs) based on electrospun PVDF nanofibers modified with laser-induced graphene (LIG) and ZnO nanorods. By integrating piezoelectric and triboelectric mechanisms, the devices demonstrate significantly enhanced energy harvesting efficiency. The incorporation of LIG is expected to facilitate charge transport because of its conductive nature, while ZnO nanorods promotes β-phase crystallization in PVDF and enhances dipole alignment. X-ray diffraction and FTIR analyses confirms peak β-phase content of 84.7 % for PLZ-1.5 composition, while DSC reveals enhanced thermal stability and crystallinity (up to 86.4 %). SEM imaging shows improved fiber morphology, partial alignment, and reduced diameter distribution contributing to superior polarization efficiency. The direct piezoelectric charge coefficient (d 33 ) reaches 50 pC/N for PLZ-1.5, indicating enhanced electromechanical coupling. The PLZ-1.5 exhibited highest output voltage (∼200 V) and power density (∼52 mW/cm 3 ) that could glow 82 LEDs. Electrical output trends under varying load resistances confirm the critical role of nanofiller optimization in enhancing performance. These findings show importance of controlled nanofiller integration for maximizing efficiency of PTENGs. The optimized hybrid devices show great potential for application in self-powered sensors, wearable electronics, and next-generation portable energy harvesting systems.

关键词： Electrospun PVDF-ZnO fibers Flexible electronics Hybrid nanogenerator Laser-induced graphene (LIG)

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Analysis of actuation characteristics of CuAlNiMn/Polyimide thin film shape memory alloy

Analysis of actuation characteristics of CuAlNiMn/Polyimide ...

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2019 International Mechanical engineering Congress, IMEC 2019

作者： Geetha, M. Dhanalakshmi, K. Jayachandran, S. Palani, I.A. Sathish Kumar, V. Department of Instrumentation and Control Engineering National Institute of Technology Tiruchirappalli620021 India Mechatronics and Instrumentation Lab Discipline of Mechanical Engineering Indian Institute of Technology Indore453331 India Mechanical Engineering Kongunadu College of Engineering and Technology Tiruchirappalli621215 India

The article presents the study of the deformation of an SMA bimorph actuator during static heating. The thermomechanical behavior of thin film CuAlNiMn shape memory alloy (SMA) on polyimide substrate is analyzed using finite element method. The analysis is carried out for three different geometries to obtain the displacement when temperature is varied. The actuation characteristics of the SMA bimorph are studied through direct heating and joule heating techniques. The surface morphology and composition of the bimorph sample are obtained using the Scanning Electron Microscope (SEM). The numerical analysis of the thermomechanical behavior of a thin film CuAlNiMn SMA bimorph is carried out using the finite element method. The procedure is applied for a double-legged cantilever configuration of the bimorph to obtain the actuation in terms of displacement;by varying the temperature. The same is repeated for semi-circular and pentagon shapes of the bimorph to obtain the influence of area on the displacement. It is observed that SMA bimorph displaces with the rise in temperature and the magnitude of displacement increases with the increase in surface area of different geometries. The physical actuation characteristic of CuAlNiMn-polyamide bimorph is studied by thermal heating and electrical heating of the sample, which confirm the shape memory effect of the SMA and provide the displacement characteristics of the bimorph when applying an electrical current. © 2019 Elsevier Ltd.

关键词： Aluminum alloys

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Laser Hybrid Wire Arc Additive Manufacturing for Fabricating Thin Sections

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Transactions of the Indian National Academy of engineering 2021年第1期7卷 175-183页

作者： Singh, Shalini Jinoop, A. N. Kumar, G. T. A. V. Tarun Shukla, Ashish Palani, I. A. Resnina, N. Paul, C. P. Prashanth, K. G. Mechatronics and Instrumentation Lab Discipline of Mechanical Engineering Indian Institute of Technology Indore India Laser Technology Division Raja Ramanna Centre for Advanced Technology Indore India Homi Bhabha National Institute Mumbai India Saint-Petersburg State University Saint-Petersburg Russia Department of Mechanical and Industrial Engineering Tallinn University of Technology Tallinn Estonia Erich Schmid Institute of Materials Science Austrian Academy of Sciences Leoben Austria CBCMT Vellore Institute of Technology Vellore India

Thin section fabrication is one of the major issues associated with the WAAM technique because of its very high feature size (~ 100 times) in comparison to other additive manufacturing processes like Selective Laser Melting (SLM), electron beam additive manufacturing (EBAM), etc. Weld pool instability, residual stress formation, spatter generation and distortion are some of the other issues in WAAM. As a result, fabricating thin sections is difficult using WAAM and thus, a hybrid approach involving laser treatment before the deposition is used in the present work. Laser marking changes the surface energy of the surface because of the changes in the surface roughness after laser treatment. Subsequently, the wettability of the surface changes and the melt pool flows into the laser marked area, which reduces the spatter. In the present work, a minimum of 1.8 mm width was achieved after laser marking. Comprehensive characterizations are also carried out to compare the microstructure and mechanical properties of WAAM samples with and without laser marking.

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Optical and structural analysis of surfactant assisted hydrothermal growth zno nanostructures 19th

Optical and structural analysis of surfactant assisted hydro...

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19th International Workshop on Physics of Semiconductor Devices, IWPSD 2017

作者： Agrawal, Jitesh Dixit, Tejendra Palani, I.A. Singh, Vipul Department of Electrical Engineering IIT Indore IndoreMadhya Pradesh India Mechatronics and Instrumentation Lab Department of Mechanical Engineering IIT Indore IndoreMadhya Pradesh India Centre of Material Science and Engineering IIT Indore IndoreMadhya Pradesh India

ISBN: (纸本)9783319976037

Hydrothermally grown ZnO nanostructures have shown high defect level emission and poor adhesivity with the substrate that was highly undesirable for optoelectronic device applications. Therefore, in this work, we have targeted these critical issues by using the surfactant (Na3C6H5O7) in the hydrothermal growth of ZnO nanostructures. Different morphologies of the nanostructures such as nano-plates and honey comb structures have been obtained by varying the surfactant concentration in the precursor solution. This has led to the significant enhancement in the NBE (near band emission) to DLE (deep level emission) ratio in the photoluminescence analysis. These ZnO nanostructures can be potential candidates for the fabrication of next generation optoelectronic devices. © Springer Nature Switzerland AG 2019.

关键词： Optoelectronic devices

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Correction to: Post-processing of Wire Arc Additive Manufactured Stainless Steel 308L to Enhance Compression and Corrosion Behavior using Laser Shock Peening Process

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Journal of Materials engineering and Performance 2023年第17期33卷 9282-9282页

作者： Thangamani, Geethapriyan Palani, I. A. Singh, Mayank K. Rai, Dhirendra K. Priyan, V. G. Shanmuga Subbu, S. Kanmani Mechatronics and Instrumentation Laboratory Department of Mechanical Engineering Indian Institute of Technology Indore Indore India Department of Applied Science and Technology (DISAT) Politecnico Di Torino Torino Italy Sustainable Energy and Environmental Materials (SEEM) Lab Department of Metallurgy Engineering and Materials Science (MEMS) Indian Institute of Technology Indore Indore India Department of Mechanical Engineering Indian Institute of Technology Palakkad Palakkad India

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Reciprocity of thermal diffusion in time-modulated systems

arXiv

引用

arXiv 2021年

作者： Li, Jiaxin Li, Ying Cao, Pei-Chao Zheng, Xu Peng, Yu-Gui Li, Baowen Zhu, Xue-Feng Alù, Andrea Qiu, Cheng-Wei Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore School of Mechatronics Engineering Harbin Institute of Technology Harbin150001 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab. of Advanced Micro Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University Hangzhou310027 China International Joint Innovation Center ZJU-UIUC Institute Electromagnetics Academy at Zhejiang University Zhejiang University Haining314400 China School of Physics and Innovation Institute Huazhong University of Science and Technology Wuhan430074 China Department of Physics University of Colorado BoulderCO80309 United States Department of Electrical Engineering City University of New York New YorkNY10031 United States Department of Mechanical Engineering University of Colorado BoulderCO80309 United States

The reciprocity principle governs the symmetry in transmission of electromagnetic and acoustic waves, as well as the diffusion of heat between two points in space, with important consequences for thermal management and energy harvesting. There has been significant recent interest in materials with time-modulated properties, which have been shown to efficiently break reciprocity for light, sound, and even charge diffusion. Quite surprisingly, here we show that, from a practical point of view, time modulation cannot generally be used to break reciprocity for thermal diffusion. We establish a theoretical framework to accurately describe the behavior of diffusive processes under time modulation, and prove that thermal reciprocity in dynamic materials is generally preserved by the continuity equation, unless some external bias or special material is considered. We then experimentally demonstrate reciprocal heat transfer in a time-modulated device. Our findings correct previous misconceptions regarding reciprocity breaking for thermal diffusion, revealing the generality of symmetry constraints in heat transfer, and clarifying its differences from other transport processes in what concerns the principles of reciprocity and microscopic reversibility. © 2021, CC BY.

关键词： Energy harvesting

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256 MHz, 1 W 780 nm femtosecond fiber laser for two-photon microscopy

256 MHz, 1 W 780 nm femtosecond fiber laser for two-photon m...

引用

Conference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2018

作者： Yang, Wan Wu, Danlei Liu, Guanyu Chen, Bingying Feng, Lishuang Zhang, Zhigang Wang, Aimin State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China Key Lab Precision Opto-mechatronics Technology Ministry of Education School of Instrumentation Science and Optoelectronics Engineering Beihang University Beijing100191 China

A robust 780 nm femtosecond fiber laser was demonstrated with 191 fs pulse width, 256 MHz repetition rate and 1 W average power. It is ideal for two-photon microscopic imaging. © OSA 2018

ISBN: (纸本)9781943580453

A robust 780 nm femtosecond fiber laser was demonstrated with 191 fs pulse width, 256 MHz repetition rate and 1 W average power. It is ideal for two-photon microscopic imaging. © OSA 2018

关键词： Pulse repetition rate

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