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Emerging Technology (INCET), International Conference for

作者： Tharun R Pavithra G S v Sreekanth N Shyam Sundar Harshitha T G Department of Electronics and Communication Engineering(ECE) Sai Vidya Institute of Technology(SVIT) Visvesvaraya Technological University (VTU)

ISBN: (数字)9798350361155

ISBN: (纸本)9798350361162

Technological developments in milking machines have drastically changed the industry of dairy products by increasing both productivity and effectiveness. To address the fuel issue and the current problem of milk machines being too expensive for farmers to buy manually operated pumps, less expensive than the milk machines that are used currently, were developed. In order to reduce the manpower needed to operate and to reduce the effort of humans to pump milk, artificial hands are being employed to pump milk. The primary focus of the system is the machine's operation, which needs on electricity to function. Since there won't always be an electrical supply in communities, we've integrated solar and battery power as a backup. The quality of milk was analyzed and different milk quality parameters were tabulated using random forest algorithm. The testing was carried out for 100ml milk samples. Additionally, it has the ability to sense the flow of milk and control the speed at which cows are milked.

关键词： Productivity Industries Dairy products Pumps Food industry Forestry Maintenance

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SIMULATION BASED design ENHANCEMENT OF MULTILAYER GAN AND INN/GAN/ALN MSM PHOTODETECTORS FOR ULTRAvIOLET SENSING

arXiv

引用

arXiv 2025年

作者： Kilin, Mustafa Tanrıverdi, Orkun Karahan, Buldan Yasar, Firat Medical Services and Techniques Adiyaman University Adiyaman Turkey Electrical and Electronics Engineering Department Adiyaman University Gaziantep Turkey Electrical and Electronics Engineering Department Hasan Kalyoncu University Gaziantep Turkey Microdevice Laboratory Jet Propulsion Laboratory NASA PasadenaCA91101 United States

A GaN-based photodetector structure was optimized and modeled in the mesa region, incorporating a nickel-gold contact layer on a sapphire substrate to enhance ultraviolet (Uv) detection. To further improve performance, an alternative design integrating thin InN (top) and AlN (buffer) layers was proposed. These additional layers were introduced to enhance carrier transport and optical absorption within the device. Following mesa thickness simulations, a silicon carbide (SiC) substrate was tested to assess its impact on detector performance. Each simulation phase aimed to optimize current-voltage (I-v) characteristics, photoabsorption rate, and spectral responsivity, ensuring the design approached realistic operational conditions. A new Sapphire/GaN(p-type)/GaN/GaN(n-type)/Ni/Au detector was designed based on the optimized buffer layer thicknesses in the mesa region, using parameters from the Sapphire/AlN/GaN/InN/Ni/Au structure. This new detector was further optimized as a function of doping concentration. Additionally, the contact electrode finger thickness and inter-finger spacing were geometrically refined to maximize performance. This comprehensive simulation study demonstrates a significant enhancement in photodetector response through structural and doping optimizations. Normalized I-v characteristics revealed a photocurrent increase of 1.16-fold to 1.38-fold at each optimization stage. Similarly, mesa region thickness optimizations improved the photoabsorption rate from 1.9727 × 1024 1/***3 to 2.1824 × 1024 1/***3. Furthermore, the spectral responsivity in the Uv region increased from 0.2800 × 10−7A to 0.4796 × 10−7A at *** results show significant improvements in the structural and electrical performance of GaN-based photodetectors, providing a promising way to develop high-efficiency Uv detection devices. © 2025, CC BY-NC-ND.

关键词： Gallium nitride

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Transient Response and Stability Improvement of Buck Converter by Using Digital Predictive v2C Peak Control

Transient Response and Stability Improvement of Buck Convert...

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第35届中国控制与决策会议

作者： Chong Zhang Chen Chen Ming Zhang Run Min School of Information Science and Engineering Wuhan University of Science and Technology Beijing Institute of Spacecraft System Engineering China Academy of Space Technology School of Optical and Electronic Information Huazhong University of Science and Technology

v control is widely used in Buck converter due to its good transient ***,its control performance is highly dependent on the value of the equivalent series resistance of the output capacitor,which may even lead to system *** overcome this issue,a digital predictive v C peak control algorithm is ***,the system structure of buck converter based on digital predictive v C control is *** control object of the inner loop is the weighted value of inductor current and output voltage instead of only output ***,according to the geometric characteristics of inductor current and output voltage ripples,the predictive v C peak control algorithm is *** can eliminate the inner loop feedback voltage disturbance within two switching cycles and effectively avoid subharmonic ***,the small-signal model analysis of Buck converter with the proposed algorithm is carried out to derive the open-loop transfer function,which guides the optimal design of the outer loop ***,simulation results prove the proposed algorithm has improved transient response and stability than v control.

关键词： v2C Control Digital Predictive Control Buck Converter Peak Control

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GaAs Truncated Cone Nanowire Array-Based Solar Cells with Carrier Selective Contacts

GaAs Truncated Cone Nanowire Array-Based Solar Cells with Ca...

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International Conference on Numerical Simulation of Optoelectronic Devices, (NUSOD)

作者： Sumit Sagar Manisha Rautela Jitendra Kumar Amitesh Kumar Samrat Mukhopadhyay Department of Electronics Engineering Indian Institute of Technology (Indian School of Mines) Dhanbad Jharkhand

ISBN: (数字)9798350390537

ISBN: (纸本)9798350390544

Recent advancements in solar cell technology have unveiled the potential of nanowire (NW) structures, particularly those incorporating III-v materials, for enhanced light absorption and reduced material consumption compared to traditional planar designs. Our research introduces a novel core-shell heterojunction design featuring a p-type GaAs truncated cone NW core and ShN 4 /TiO 2 shell. In this study, the short-circuit current density (J sc ), open-circuit voltage (v oc ), power conversion efficiency (PCE) and fill factor (FF) are evaluated to determine the optoelectronic performance of the investigated NWs. Through comprehensive simulations, it has been demonstrated that the optimized structure significantly reduces optical losses and improves minority carrier transport, achieving a power efficiency of 22.487% with an enhancement of 49.74% over conventional truncated cone NWs. This innovative approach yielded a short circuit current density of 26.45 mA/cm2, marking a significant advancement in radial junction NW solar cells.

关键词： Absorption Photovoltaic cells Short-circuit currents Gallium arsenide Doping voltage Heterojunctions Semiconductor process modeling Power conversion Integrated circuit modeling

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Investigations of photo-transient properties and applications as photosensors in well-characterized tin telluride (SnTe) single crystal

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MATERIALS CHEMISTRY AND PHYSICS 2024年 314卷

作者： Bodarya, vijaykumar Jagani, Hirenkumar Shantilal Patel, Abhishek vyas, C. U. Gohil, Jagrutiba Pathak, v. M. Sardar Patel Univ Dept Phys Vallabh Vidyanagar 388120 India AN Patel Post Grad Inst Sci & Res Dept Phys Anand 388001 India Gyanmanjari Innovat Univ Dept Phys Bhavnagar 364002 Gujarat India

The current scenario demands new semiconducting materials for the development of fast-reacting sensors, detectors, and special solid-state devices. On the way to finding a solution, alloy engineering has emerged as a vital option for the research community. The present study focuses on the investigation of photo-transient properties and the potential application of a well-characterised Tin Telluride (SnTe) single crystal as a photo-sensor. SnTe has attracted significant attention due to its promising optoelectronic properties and its large suitability for a variety of applications in various fields of material engineering. The present work employs various characterizations/.vm, dmjmof grown single crystals to understand their structural, morphological, and electrical properties. Furthermore, the photo-transient properties of SnTe were investigated by an in-house design setup to study its photo-driven reaction under different illumination conditions. The results reveal the excellent photoresponse of the fitted sample, suggesting a fast response time, high sensitivity, and wide spectral reacting ability of the grown crystalline material. Additionally, we explore the feasibility of SnTe as a photosensor by investigating its performance under environmental conditions. The findings indicate that SnTe exhibits remarkable stability and reliability, making it a promising candidate for photo-sensing applications. The insights obtained from this investigation contribute to the understanding of the photo-transient behaviour of SnTe and provide valuable knowledge of optical and photo-responsive parameters for designing efficient photosensors using grown material.

关键词： SnTe DvT Photo -transient Photo -sensor Photodetector

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Essential semiconductor films in micro-/nano-biosensors: current scenarios

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JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS 2021年 127卷 302-311页

作者： Gopinath, Subash C. B. Ramanathan, Santheraleka Yasin, Mohd Najib Mohd Shapiai, Mohd Ibrahim Ismail, Zool Hilmi Subramaniam, Sreeramanan Univ Malaysia Perlis Inst Nano Elect Engn Kangar 01000 Perlis Malaysia Univ Malaysia Perlis Fac Chem Engn Technol Arau 02600 Perlis Malaysia Univ Sains Malaysia USM Ctr Chem Biol CCB Bayan Lepas 11900 Penang Malaysia Univ Malaysia Perlis Fac Elect Engn Technol Adv Commun Engn ACE Ctr Excellence Arau 02600 Perlis Malaysia Univ Teknol Malaysia Ctr Artificial Intelligence & Robot Jalan Sultan Yahya Petra Kuala Lumpur 54100 Malaysia Univ Sains Malaysia USM Sch Biol Sci George Town 11800 Penang Malaysia

Background: engineering nanoscale matter in a controlled functional system has expanded the area of science in the state-of-art of nanotechnology. The urgency in introducing real-time health monitoring sensors and rapid diagnostic tools in medical health is indeed high and crucial to date. The efforts are accompanied by nanotechnology to improve the sensors performances. In this line, semiconductor materials (Silicon/Silica) have been in well-focus to develop micro-/nano-sensors. Methods: Further, additional layering such as metal oxide and graphene material have elevated the current scenario in biosensor developments. Among these, two-dimensional graphene nanomaterial owns its remarkable mechanical, electronic, electrochemical, and optical properties, has excited the medical field to develop graphene-based biosensors for human health diagnosis and monitoring. The oxygen rich graphene materials enhance the bio-functionalization of recognition bio-elements for excellent graphene-based bio-sensor development. Significance: This review encloses the excellence of semiconductor materials in conjunction with biosensors for monitoring health and diagnosis. The advances and challenges encountered with developing semicon-ductors for nanobiosensors from laboratory set-up to the novel hand-held device for rapid and accurate human health care are outlined. (c) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.v. All rights reserved.

关键词： Nanomaterial Semiconductor industry Nanobiosensor Signal transduction

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LiFall: Passive Indoor Fall Detection System Based on Illumination and visible Light Communication Networks

LiFall: Passive Indoor Fall Detection System Based on Illumi...

引用

2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Xu, Zhancong Liang, Chenxin Wang, Jingyang Ruan, Liguang Li, Jiarong Dong, Yuhan Ding, Wenbo Song, Jian Tsinghua University Shenzhen International Graduate School Shenzhen China Peng Cheng Laboratory Shenzhen China RISC-V International Open Source Laboratory Shenzhen China Tsinghua University Department of Electronic Engineering Beijing China

ISBN: (纸本)9798350375909

Effective fall detection is a critical component of indoor health monitoring for individuals. The most widely used wearable devices are not convenient, especially for the elderly. Another approach of passive solutions usually use RGB camera, millimeter-wave radar, or WiFi. However, they bring about issues of privacy infringement and/or electromagnetic interference. Among them, visible light-based systems can avoid these issues, however, they require customized light sources and highly sensitive receivers, making it expensive for deployment. Motivated by these previous works, we aim to design a passive, low-invasiveness, and low-cost fall detection system. In this work, we propose LiFall, a passive fall detection system based on illumination and visible light communication (vLC) networks, which eliminates the need for hardware modifications to current devices. LiFall detects human falls by analyzing the intensity variation of the received optical signals captured by the low-cost photodetectors. Subsequently, we propose an innovative signal segmentation algorithm tailored for accurately segmenting human activities in the time series. Compared to existing double-window segmentation schemes, our method enhances the signal integrity by 20%. In order to identify falls, we analyze the temporal statistical features and waveform characteristics derived from human activity signals and adopt the lightweight classifiers of support vector machines (SvM) and random forests (RF) for fall detection. We deploy LiFall system in various typical indoor scenarios and collect human fall and other daily activity data for system performance evaluation. Experimental results demonstrate that LiFall is able to achieve a fall detection accuracy exceeding 90% in different typical indoor settings without compromising illumination and communication. © 2024 IEEE.

关键词： Fall detection

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Thermo-chemical Characterisation of Fe–Ni Alloys for Space Applications 1st

Thermo-chemical Characterisation of Fe–Ni Alloys for Space ...

引用

1st International Conference on Futuristic Advancements in Materials , Manufacturing and Thermal Sciences, ICFAMMT 2022

作者： Ghotekar, Yogesh varma, Ravi Kumar Shah, v.M. Modi, H.M. vora, A.P. Lal, A.K. Makwana, B.A. Ahmedabad India Mechanical Quality Assurance Group Ahmedabad India Ahmedabad India Gandhinagar India

ISBN: (纸本)9789811949173

In aerospace applications, Iron-Nickel (Fe–Ni) alloys are first choice of structural designers, whenever high strength and low thermal expansion are required for spacecraft subsystems. Fe–Ni alloy have an extraordinarily minimum thermal expansion, and dimensions were nearly invariable even at cryogenic temperatures, popularly it is called Invar. This alloy is used as a structural component in optical payloads and accelerometer in spacecraft systems. For enhancing the thermal conductivity of Fe–Ni alloys, Cobalt and Silver elements were added to alloy. Cobalt added in Invar alloy called as Kovar, whereas if silver is added, then it is called Silvar. Kovar acts as sealing alloys in space applications specific to commutation satellites. This paper highlights on the estimation of thermal properties and chemical constituents of Fe–Ni alloys. Study reveals that, Invar has 64.271% of Fe, 35.15% of Ni and total 0.608% of other constituents. As the temperature increases from −150 to 200 °C, thermal conductivity of Invar increased from the 12.567 to 18.420 W/(m K). Thermal conductivity of Fe–Ni alloy is enhanced up to 21.454 W/(m K) by addition of 17% Cobalt, whereas addition of 32.2% of silver will enhance the thermal conductivity up to 51.084 W/(m K). For Invar, mean coefficient of thermal expansion (CTE) of 1.998 ppm/°C observed for 150 °C to 200 °C temperature range while in case of Kovar and Silvar alloy, mean CTE enhances up to 7.018 ppm/°C and 6.928 ppm/°C, respectively. current study provides the valuable thermal data at sub-ambient and higher cryogenic temperature for thermal design of systems. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Thermal conductivity

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Finite-element assembly approach of optical quantum walk networks

arXiv

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arXiv 2024年

作者： Schwarze, Christopher R. Simon, David S. Manni, Anthony D. Ndao, Abdoulaye Sergienko, Alexander v. Department of Electrical and Computer Engineering & Photonics Center Boston University 8 Saint Mary's St. BostonMA02215 United States Department of Physics and Astronomy Stonehill College 320 Washington Street EastonMA02357 United States Department of Electrical and Computer Engineering University of California La Jolla San DiegoCA92093-0401 United States Department of Physics Boston University 590 Commonwealth Avenue BostonMA02215 United States

We present a finite-element approach for computing the aggregate scattering matrix of a network of linear coherent scatterers. These might be optical scatterers or more general scattering coins studied in quantum walk theory. While techniques exist for two-dimensional lattices of feed-forward scatterers, the present approach is applicable to any network configuration of any collection of scatterers. Unlike traditional finite-element methods in optics, this method does not directly solve Maxwell's equations;instead it is used to assemble and solve a linear, coupled scattering problem that emerges after Maxwell's equations are abstracted within the scattering matrix method. With this approach, a global unitary is assembled corresponding to one time step of the quantum walk on the network. After applying the relevant boundary conditions to this global matrix, the problem becomes non-unitary, and possesses a steady-state solution which is the output scattering state. We provide an algorithm to obtain this steady-state solution exactly using a matrix inversion, yielding the scattering state without requiring a direct calculation of the eigenspectrum. The approach is then numerically validated on a coupled-cavity interferometer example that possesses a known, closed-form solution. Finally, the method is shown to be a generalization of the Redheffer star product, which describes scatterers on one-dimensional lattices (2-regular graphs) and is often applied to the design of thin-film optics, making the current approach an invaluable tool for the design and validation of high-dimensional phase-reprogrammable optical devices and study of quantum walks on arbitrary graphs. © 2024, CC BY.

关键词： Matrix algebra

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Eu^(3+)-Bi^(3+)Codoping Double Perovskites for Single-Component White-Light-Emitting Diodes

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Energy Material Advances 2023年第1期4卷 175-184页

作者： Tianyuan Wang Donglei Zhou Zhongzheng Yu Tingting Zhou Rui Sun Yuqi Wang Xiaomei Sun Yue Wang Yongzhi Shao Hongwei Song State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun130012China Cavendish Laboratory University of CambridgeCambridgeCB30HEUK

Double perovskites(DPs)with Cs_(2)AgInCl_(6) composition,as one of the lead-free perovskites,have been in the spotlight owing to their intriguing optical properties,namely,self-trapped exciton(STE)emission and dopant-induced ***,the current DPs still face the challenge of low photoluminescence efficiency and cannot be applied in ***,we synthesize the Bi^(3+)and Eu^(3+)codoped Cs_(2)AgInCl_(6) DPs,which displays enhanced STE and Eu^(3+)ions characteristic *** results indicate that the Eu^(3+)ions mainly substitute the In sites and can increase the radiative recombination rate and exciton binding energy of STEs,which is discovered that Eu^(3+)ions can promote the localization of STEs by breaking the inversion symmetry of the Cs_(2)AgInCl_(6) *** existence of Bi^(3+)ions decreases the excitation(absorption)energy,provides a new absorption channel,and increases the energy transfer rate to Eu^(3+)*** adjusting the Bi^(3+)and Eu^(3+)concentrations,a maximum photoluminescence quantum yield of 80.1%is obtained in 6%Eu^(3+)and 0.5%Bi^(3+)codoped Cs_(2)AgInCl_(6) ***,the high-quality single-component white-light-emitting diodes based on Bi^(3+)and Eu^(3+)codoped Cs_(2)AgInCl_(6) DPs and a 410-nm commercial ultraviolet chip are fabricated with the optimum color rendering index of 89,the optimal luminous efficiency of 88.1 lm/W,and a half-lifetime of 1,493 *** work puts forward an effective lanthanide and transition metals codoping strategy to design single-component white-light emitter,taking a big step forward for the application lead-free DPs.

关键词： perovskite doping rendering

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