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8th International Conference on Electronics, Materials Engineering and Nano-technology, IEMENTech 2025

作者： Bala, Sourav Sarkar, Sudipta Maity, Santanu Mukhopadhyay, Sumita School of Advanced Materials Indian Institute of Engineering Science and Technology Green Energy and Sensor Systems Howrah Shibpur India

ISBN: (纸本)9798331520762

In the absence of conventional energy sources renewable energy is the only suitable option left. Multiple renewable energy sources like Hydroelectric Energy, Tidal Energy, Geothermal Energy, and Solar Electrical Energy are becoming popular every day. There are multiple reasons such as its availability in small to large sizes, predictability, easy installation, smooth maintenance process, drop in system installation cost, and mostly fast return on investment. With the increase in demand for solar photovoltaic panels, the demand for producing higher power output from less area is increasing rapidly. Hence with every breakthrough, the efficiency of the Photovoltaic Panel is increasing rapidly. With continuous development, the PV modules are developed in such a way that light can be absorbed from the front and rear on both sides. In the Bi-facial module, the direct sunlight gets absorbed from the front, and the albedo is also absorbed from the back to increase the power generation further. With the implementation of half-cut technology, the shading losses are minimized further. Rapid development is also being done on MPPT and Inverter to improve efficiency. Presently a generalized mathematical model for bifacial half-cut module is not published in any literature. In this paper, the research gap is covered by designing a Bifacial Half-cut PV Module along with an MPPT and also a bidirectional DC-DC Converter for charging and discharging of Battery Bank. Finally, we have integrated the system and also have simulated the designed system to check its stability. Such a model helps in analyzing and validating performance characteristics of commercially available bifacial modules and half-cut modules. © 2025 IEEE.

关键词： Tidal power

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Terahertz polarization modulator based on chiral metasurface integrated with vanadium dioxide

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Optics Letters 2025年第10期50卷 3345-3348页

作者： Luo, Li Zhou, Ling Zou, Yuxin Yang, Jiaqi Huo, Jiahui Yang, Xu Lv, Yuanyuan Bian, Jingjing Peng, Sui Liu, Bo Pan, Yudong He, Jin Li, Jie Yao, Jianquan Sichuan Province Key Laboratory of Optoelectronic Sensor Devices and Systems College of Optoelectronic Engineering Chengdu IC Valley Industrial College Chengdu University of Information Technology Chengdu610225 China Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center Chengdu University of Information Technology Chengdu610225 China Chengdu Advanced Metal Materials Industry Technology Research Institute Limited Company Chengdu610300 China School of Precision Instruments and Opto-Electronics Engineering Tianjin University Tianjin300072 China

Conventional optical polarization modulation depends on block birefringent devices, and currently there are still no commercial polarization modulation devices available for terahertz beams in free space. Metasurfaces present more opportunities for the manipulation of optical and terahertz waves, which are advantageous for highly efficient polarization modulation devices. In this paper, what we believe to be a new chiral metasurface for the polarization modulation of reflected terahertz waves is proposed that consists of vanadium dioxide (VO2) combined with metal patterns for active chiral meta-atoms. Through electric stimulation, dynamic modulation of the polarization state can be achieved. The results indicate that the metasurface shows a strong circular dichroism at an operating frequency of 0.192 THz. In the insulating state, the absorption of the right-circularly polarized (RCP) wave is significantly higher than that of the left-circularly polarized (LCP) wave. By adjusting the transition state of VO2, the chirality of the structure is reduced, enabling the reflected wave to be switched from a circularly polarized state to a linearly polarized one. The absorption and polarization of terahertz wave can also be controlled by the incident angle. This method is anticipated to promote the development of terahertz communication and imaging technologies. © 2025 Optica Publishing Group. All rights are reserved.

关键词： Circular polarization

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Fabry–Perot interference optical fiber biosensor based on the ECF for label-free DNA detection

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Applied Optics 2025年第9期64卷 2255-2260页

作者： Wang, Lina Li, Chong Cai, Jun Wu, Shenbing Dai, Mingxia Geng, Youfu Yi, Duo Li, Xuejin College of Electronic Engineering Huainan Normal University Huainan232038 China Shenzhen Key Laboratory of Sensor Technology Shenzhen University Shenzhen518060 China Shenzhen Key Laboratory of Advanced Thin Films and Applications College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China School of Science and Engineering Chinese University of Hong Kong Shenzhen518172 China

A fiber-optic biosensor based on self-reference parallel Fabry–Perot interference (FPI) is proposed for label-free DNA detection. The parallel FPI is formed by fusing a section of exposed core fiber (ECF) in SMF and MMF. Adopting the air cavity of the ECF as a reference, a self-reference differential phase demodulation technique is designed to improve the stability and resolution of the demodulation system. By functionalizing the fiber surface, the sensor can efficiently capture complementary DNA (cDNA). In addition, the specific selection performance of the sensor is explored using non-complementary DNA (N-cDNA). The experimental results show that the sensor exhibits a good linear response in the concentration range of 1 to 5 µM, and the sensitivity reaches 5.53◦/µM. The detection concentration can be as low as 1 µM. The proposed fiber-optic DNA biosensor has good sensitivity and selectivity and has broad prospects in the fields of biomedical diagnostics, environmental monitoring, and food safety detection. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Optical fibers

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Reinforcement Learning for Mobile Robot's Environment Exploration

Reinforcement Learning for Mobile Robot's Environment Explor...

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Robotics and Technologies for Industrial Automation (ROBOTHIA), IEEE International Conference on

作者： Saif Alahdal Nasr Abdalmanan Kamarulzaman Kamarudin Muhammad Aizat Abu Bakar Mohd Rizal Manan Ahmad Shakaff Ali Yeon Syed Muhammad Mamduh Faculty of Electrical Engineering & Technology Universiti Malaysia Perlis Arau Malaysia Center of Excellence for Advanced Sensor Technology Faculty of Electrical Engineering & Technology Universiti Malaysia Perlis Arau Malaysia Faculty of Electrical Engineering & Technology Universiti Malaysia Perlis Perlis Malaysia Center of Excellence for Advanced Sensor Technology Universiti Malaysia Perlis Arau Malaysia

ISBN: (数字)9798350356755

ISBN: (纸本)9798350356762

The field of mobile robotics has become increasingly significant in today's technology-driven world, with applications ranging from autonomous vehicles to automated delivery systems. This project aims to enhance the capabilities of mobile robots in navigating and exploring unfamiliar environments by developing and implementing a Reinforcement Learning (RL) model. The core objective is to enable these robots to autonomously explore, navigate, and adapt to new surroundings efficiently. By integrating the RL model into a mobile robot using the Robot Operating System (ROS), the project evaluates the system's efficiency through comprehensive ground experiments. The research compares the RL-based approach with established exploration methods, emphasizing the effectiveness of the Value Iteration algorithm, a dynamic programming algorithm for Markov Decision Processes (MDPs). Controlled experiments conducted in a 6×3 meter flat space with static obstacles and a 2D lidar sensor provide valuable insights into the RL model's performance and potential real-world applications. The findings highlight the advantages of the Value Iteration algorithm over traditional exploration methods, demonstrating its potential for improving autonomous robotic navigation and exploration.

关键词： Adaptation models Accuracy Service robots Heuristic algorithms Reinforcement learning Robot sensing systems Robustness Dynamic programming Mobile robots Robots

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Design and Simulation of a PV System with Battery Storage Using Bifacial Halfcut Module

Design and Simulation of a PV System with Battery Storage Us...

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International Conference on Electronics, Materials Engineering and Nano-technology (IEMENTech)

作者： Sourav Bala Sudipta Sarkar Santanu Maity Sumita Mukhopadhyay Green Energy and Sensor Systems School of Advanced Materials Indian Institute of Engineering Science and Technology Shibpur Howrah India

ISBN: (数字)9798331520762

ISBN: (纸本)9798331520779

关键词： Photovoltaic systems Geothermal energy Mathematical models Stability analysis Inverters Batteries Maintenance Tidal energy MATLAB Investment

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Quenching-induced surface reconstruction of perovskite oxides activating bifunctional sites towards oxygen electrodes for recharge zinc–air batteries

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Energy Storage Materials 2025年 78卷

作者： Li, Kaixin Li, Ying Han, Xu Shao, Qi Lü, Zhe School of Physics Harbin Institute of Technology Heilongjiang Harbin150001 China Heilongjiang Provincial Key Laboratory of Advanced Quantum Functional Materials and Sensor components China

Exploring effective and dependable bifunctional oxygen electrode catalysts remains a persistent challenge for impeding the advancement of zinc-air batteries (ZABs). Herein, we propose an innovative solution quenching strategy to engineer a self-adaptive perovskite oxide/hydroxide heterojunction with dynamically reconfigurable active sites. Through deliberate Fe-ion doping and controlled oxygen defect engineering, this approach enables in situ surface reconstruction under operational conditions, effectively activating a lattice oxygen-mediated reaction pathway (LOM). The optimized quenched PrBaCo2O6-δ catalyst demonstrates exceptional bifunctionality with a remarkably reduced OER/ORR potential gap of 117 mV (ΔE = EOER@10mA/cm² - EORR@E1/2), outperforming most reported perovskite analogs in alkaline media. When deployed in zinc-air batteries, the catalyst enables excellent cyclability with a record power conversion efficiency of 64.8% and maintains stability for 300 hrs of cycling with a cycle efficiency decay rate of less than 7.3%. Our findings not only provide novel perspectives for designing self-optimizing electrocatalysts through defect-mediated phase engineering but also provide a paradigm for high-stability Zn-Air battery systems. © 2025 Elsevier B.V.

关键词： Zinc air batteries

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A Review on High Entropy Alloys as Metallic Biomaterials: Fabrication, Properties, Applications, Challenges, and Future Prospects

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Biomedical Materials and Devices 2025年 1-30页

作者： Adhikari, Jaideep Saha, Prerona Mandal, Pritam Sinha, Sudip Kumar Seikh, Asiful H. Mohammed, Jabair A. Ghosh, Manojit School of Advanced Materials Green Energy and Sensor Systems Indian Institute of Engineering Science and Technology Shibpur Howrah 711103 India Department of Metallurgy and Materials Engineering Indian Institute of Engineering Science and Technology Shibpur Howrah 711103 India Department of Metallurgical and Materials Engineering National Institute of Technology Raipur 492010 India Center of Excellence for Research in Engineering Materials (CEREM) Deanship of Scientific Research King Saud University Riyadh 11421 Saudi Arabia

In recent years, designing alloys with diverse elements or high entropy alloys (HEAs) has received significant research interest for biomedical applications, particularly bone repair techniques that use materials with excellent strength and biocompatibility. This review paper transitions from the core HEA concept to factors influencing cell-material interactions. The application area for Bio-HEA was not only fixed to orthopaedic implants;prospects in photothermal, bioimaging, biosensors, and therapeutics have also been discussed. Another focus of this review is identifying suitable elements that can elucidate reduced toxicity with enhanced antimicrobial activity. Critical discussions on lowering elastic modulus techniques for bio-HEAs have been provided that mitigate stress-shielding effect-related implant rejection. Further, corrosion and wear resistance and their impact on cellular functions have been discussed. Synthesis of HEA as a bulk material and the nuances of HEA as a nanoparticle have been discussed along with high entropy-based other systems for biomedical applications. The review further delves into HEA composite fabrication and its applicability as a coating material. Concepts like strength-ductility trade-off, the impact of elemental alloy composition on corrosion and other physical properties, strengthening mechanism, and single-phase stability concepts were discussed in connection to the Bio-HEA. The paper concludes by identifying the present challenges limiting the clinical translation of HEAs and exploring future in-depth research directions involving computational modelling and advanced manufacturing to optimize HEAs for biomedical use further. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.

关键词： Antimicrobial mechanism Bio-high entropy alloys Corrosion and wear resistance Implant host response

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Engineering design of feedstock powder and relevant thermal-mechanical performance of thermal/environmental barrier coatings

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Journal of advanced Ceramics 2025年第2期14卷 37-56页

作者： Xinchang Feng Fangwei Guo Lirong Luo Yuzhang Wang Yun Long Xiaofeng Zhao Fei Pan Lei Guo Qingfeng Zeng Jing Feng Chunlei Wan Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China National Engineering Research Center of Special Equipment and Power System for Ship and Marine Engineering Shanghai 200030China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Advanced Nuclear Energy Technology Nuclear Power Institute of ChinaChengdu 610213China Innovative Sensor Technology IST AG Ebnat-Kappel 9642Switzerland School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Tianmushan Laboratory Hangzhou 311115China School of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

The development of aeroengine with a high thrust-weight ratio poses great challenges for current top-coating thermal barrier coatings (TBCs) and environmental barrier coatings (EBCs) in service. Medium/high-entropy ceramics are highly promising candidate material for advanced TBCs/EBCs owing to their low thermal conductivity, high melting point, high-temperature stability, and calcium–magnesium–alumino–silicate (CMAS) resistance. Most feedstock powder used for medium/high-entropy TBCs/EBCs is prepared via traditional spray drying, which cannot fully exploit the advantages of multicomponent ceramics. The density, sphericity, inner structure, and flowability of feedstock powder affect their melting state during the thermal spraying process, which strongly affects the microstructure and properties of the deposited coatings. Therefore, the deposited coatings exhibit phase segregation, amorphous phases, and microstructure defects owing to unpredictable variations in feedstock powder with random morphologies and structures. Here, the structure and properties of feedstock powder prepared by state-of-the-art granulation technologies and their influences on the deposited coatings were systematically investigated, which can provide guidance for configuration optimization of feedstock powder and the manufacturing accuracy of the deposited coating. This review aims to bridge the gap between cutting-edge ceramics and advanced engineering technologies, thus providing concrete background knowledge and crucial guidelines for designing and developing TBCs/EBCs.

关键词： thermal/environmental barrier coatings(TBCs/EBCs) spraying ceramic powder multiscale structure control high-entropy ceramics thermal-mechanical performance

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Recent progress in metal-organic frameworks(Part Ⅱ—material application)

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Science China Chemistry 2025年第5期68卷 1642-1702页

作者： Jiandong Pang Wentao Jiang Xue-Wen Zhang Hao-Long Zhou Yuxiu Sun Wei Gong Bin Wang Fuyin Ma Linwei He Long Chen Qiang Chen He-Qi Zheng Yuanjing Cui Wen-Jie Shi Chao Zhang Mei Wang Yue-Biao Zhang Jie-Peng Zhang Chongli Zhong Yong Cui Shuao Wang Jian-Rong Li Guodong Qian Tong-Bu Lu Huan Pang Xian-He Bu School of Materials Science and Engineering Nankai University School of Physical Science and Technology Shanghai Tech University MOE Key Laboratory of Bioinorganic and Synthetic Chemistry GBRCE for Functional Molecular EngineeringSchool of ChemistryIGCMESun Yat-sen University Department of Chemistry Shantou University School of Chemical Engineering and Technology Tiangong University School of Chemistry and Chemical Engineering Shanghai Jiao Tong University State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary SciencesSoochow University College of Materials Science & Engineering Beijing University of Technology State Key Laboratory of Silicon and Advanced Semiconductor Materials Cyrus Tang Center for Sensor Materials and ApplicationsSchool of Materials Science & EngineeringZhejiang University Institute for New Energy Materials and Low Carbon Technologies School of Materials Science and EngineeringTianjin University of Technology School of Chemistry and Chemical Engineering Yangzhou University

As a class of functional crystalline porous materials, metal-organic frameworks(MOFs) gained rapid development in the past three decades and a large number of MOFs with ordered structures, high surface areas, and functionalized channels have been investigated. MOFs and MOF-derived/composite materials show great potential in many application fields. In this review, we discussed the main applications of MOFs and MOF-derived/composite materials in small molecule storage, separation, luminescence, sensing, multitype catalysis, and energy storage. In addition, challenges and problems in the future research of MOFs-related fields are also discussed.

关键词： metal-organic frameworks storage and separation sensing and detection multitype catalysis energy storage

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Ti-diffused KTN waveguide enabling intensity modulation based on the quadratic electro-optic effect

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Optics Express 2025年第11期33卷 23269-23279页

作者： Tao Wang Yu Wang Peng Tan Bohan Xing Zhenghao Li Mingxuan Liu Ziyao Zhu Hao Tian School of Physics Harbin Institute of Technology Harbin 150001 China Heilongjiang Provincial Key Laboratory of Advanced Quantum Functional Materials and Sensor devices Harbin 150001 China tanpeng@*** Key Laboratory of Micro-Nano Optoelectronic Information System Ministry of Industry and Information Technology Harbin 150001 China

Optical waveguides are fundamental components in integrated optics, enabling the confinement of light beams at micron and nanometer scales. The performance of electro-optic materials is the key to realizing waveguide-based modulation devices. Potassium tantalate niobate (KTN) crystals exhibit exceptional quadratic electro-optic effects, making them highly promising for applications in optical waveguides and electro-optic modulators. This study explored a novel, to our knowledge, optical waveguide leveraging the quadratic electro-optic effect of KTN crystals. Buried waveguides with a width of 10 μm were fabricated in KTN crystals using the titanium ion diffusion method. The impact of ion diffusion on the crystal structure of KTN was analyzed using confocal Raman spectroscopy. Based on the optical waveguide, an intensity modulator with a single waveguide and an extinction ratio of 14.2 dB at 1550 nm was developed. The modulator's different modulation functions were evaluated without and with an applied bias voltage. This research offers valuable insights for the design and production of low-driving, efficient electro-optic modulation devices in integrated optics.

关键词： Kerr effect Light beams Lithium niobate waveguides Nonlinear effects Nonlinear optics applications Optical frequency conversion

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