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Robustness of gross primary production estimation from long-term reconstructed solar-induced chlorophyll fluorescence varies with greenness on a global scale

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Journal of Applied Remote Sensing 2025年第1期19卷

作者： Fu, Lijiang Xia, Qian Tang, Hao Chen, Junqing Tan, Jinglu Guo, Ya Jiangnan University Ministry of Education Key Laboratory of Advanced Process Control for Light Industry Wuxi China Changshu Institute of Technology School of Electrical Engineering and Automation Changshu China University of Missouri Department of Chemical and Biomedical Engineering ColumbiaMO United States

Long-term reconstructed solar-induced chlorophyll fluorescence (SIF) derived from raw gridded SIF has been used for the estimation of gross primary production (GPP), but the robustness of the spatial relationship may vary from location to location. We examined the often-used linear relationship between GPP and SIF in terms of R2 values for varied locations globally using three GPP datasets (FLUXCOM, VPM, PML) and three long-term reconstructed monthly SIF datasets (CSIF, SIF005, and RTSIF). The results show that the R2 value is a concave function of vegetation greenness level (NDVI) on an annual or seasonal basis. The average R2 is over 0.8 in areas where the annual average NDVI is in the range of 0.4 to 0.6, whereas the R2 is much lower where the annual average NDVI is less than 0.2 or greater than 0.8. Prediction of GPP or SIF by three methods from five major environmental variables revealed greater uncertainties in GPP and/or SIF at low or high greenness levels as an apparent cause of the low R2. The results offer useful insights into how global GPP may be effectively estimated from multi-satellite measured SIF. © 2025 Society of Photo-Optical instrumentation Engineers (SPIE).

关键词： Optical correlation

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Retrofittable Air Cell Cushion for Pressure Ulcer Protection using Piezo-Resistive Pressure Sensing 11

Retrofittable Air Cell Cushion for Pressure Ulcer Protection...

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11th RSI International Conference on Robotics and Mechatronics, ICRoM 2023

作者： Yadhu, B. Sanjana, C. Raamanujan, C. Dharshan, S. Chaudhari, Labhesh Dharsini, S. Maithreyan, G. National Institute of Technology Department of Production Engineering Tiruchirappalli India National Institute of Technology Department of Mechanical Engineering Tiruchirappalli India National Institute of Technology Department of Instrumentation and Control Engineering Tiruchirappalli India

ISBN: (纸本)9798350308105

Pressure ulcers are painful sores that occur by exposure to high-pressure points for a considerable time. This leads to a restriction in blood flow and tissue necrosis. In this work, A retrofittable sensor-integrated air cell-based cushion system was developed to address the issues. The system consists of an air cell array, a honeycomb-like cushion, a pneumatic control unit, and a resistance-based pressure sensor array. The prototype consists of 256 pressure cells on a 17- cm×22-cm sheet, which is flexible in two dimensions. High-pressure point detection and automatic unloading were carried out to address newly produced pressure places, followed by redistribution. Offloading and redistribution with pressure mapping enabled can objectify control of loading magnitude and duration impacts at the seated interface. © 2023 IEEE.

关键词： Pressure sensors

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Performance Comparison of Different controllers for Permanent Magnet Synchronous Motor Drive System

Performance Comparison of Different Controllers for Permanen...

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2023 International Conference on Circuit Power and Computing Technologies, ICCPCT 2023

作者： Sathyendra, K.S. Navada, Bhagya R. Manipal Institute of Technology Department of Instrumentation and Control Engineering Manipal Academy of Higher Education Manipal576104 India

ISBN: (纸本)9798350333244

A study on the performance of controllers is carried out for a PMSM Drive system used in Electric Vehicles. In recent times, PMSMs are considered as the most suitable AC machines for control applications because of their features like maximum torque or inertia ratio, top speed, peak efficiency, improved dynamic performance, smaller size, easy maintenance etc. With mentioned advantages, PMSM's are widely used for applications in the domain of robotics, transportation, aerospace, etc. A large number of control strategies are present to control the PM Synchronous Motors. In this article, Field Oriented control technique is employed to control the speed and torque of an Interior PMSM. A Mathematical Model of IPMSM in rotary orthogonal reference (d,q) frame is presented in this paper. Using this model, PI controllers are designed to control the speed and current of IPMSM. This work is implemented through simulation in PSIM software environment. © 2023 IEEE.

关键词： Vector control (Electric machinery)

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A Comparative Analysis of Different Batteries technology on Off-Grid Hybrid System 2

A Comparative Analysis of Different Batteries Technology on ...

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2nd IEEE International Conference on Measurement, instrumentation, control and Automation, ICMICA 2023

作者： Gaurav, Avinash Tyagi, Arjun Kumar, Bhavnesh Jha, Shyama Kant Netaji Subhash University of Technology Department of Electrical Engineering New Delhi110078 India University of Delhi Faculty of Technology Department of Electrical Engineering Delhi110007 India Netaji Subhas University of Technology Department of Instrumentation and Control Engineering New Delhi India

ISBN: (纸本)9798350355048

Several rural communities are still living with disrupted power supplies. Consequently, diesel generators are used for getting regular power supply to provide effective healthcare services. Usage of diesel generator not only have deteriorating impact on the environment, but also is an expensive alternative to grid supply. Usage of renewable energy systems with battery are becoming popular solution for feeding such kind of loads in the remote areas. In this work, an off-grid hybrid electrification system (HES) is designed which consists of Solar PV-Diesel Generator-Batteries for the regular supply of electricity to the available load of PHC, located in a remote area of Kaimur district in Bihar, India. Investigation is carried out for five different technologies of batteries Lead-acid (LA), Lithium-ion (LI), Vanadium flow (VF), Zinc bromide (ZB) and Nickel-iron (NI) which are incorporated with HES. An optimum configuration for a PHC has been designed taking all major techno-economic factors and renewable penetration into consideration. Investigation reveals that a vanadium flow-based hybrid electrification system is the most feasible solution with respect to the techno-economic perspective among all considered configurations. © 2024 IEEE.

关键词： Lithium-ion batteries

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Circular Slot Radiator for UWB and 5G-I Band Microwave Applications 3

Circular Slot Radiator for UWB and 5G-I Band Microwave Appli...

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3rd IEEE International Conference on Mobile Networks and Wireless Communications, ICMNWC 2023

作者： Nayak, Shashank S. Dhanush, C.V. Varun Yadav, Swati Varun Yadav, Manish Manipal Institute of Technology Department of Instrumentation and Control Engineering Manipal Academy of Higher Education Karnataka Manipal India

ISBN: (纸本)9798350317022

A Circular Slot Radiator for UWB and 5G-I Band Microwave Applications is the focus of this antenna design. he primary goal is to strike a delicate balance between complexity and size efficiency. On the front side of the antenna, you'll find a central slotted rectangular patch, which includes a circular slot and two rectangular slots positioned along the lower portion of the patch. The central feed mechanism is established using a 50-ohm strip line that connects to a microstrip line. Simultaneously, the rear side of the antenna incorporates a well-defined bottom plane to enhance its performance, especially at higher *** assess its performance comprehensively, the antenna undergoes simulation studies conducted using CST Microwave Studio. The substrate employed in these simulations is an FR-4 material with dimensions measuring 15x16x1.5 cubic millimeters, resulting in an electrical size of approximately 0.15λ0.16λ0.015λ. The simulation results are quite impressive, showcasing significant attributes such as an extensive impedance bandwidth spanning 127% and a return loss as low as -33 dB. These impressive characteristics cover a broad frequency range from 3.1 to 14 GHz, with a central frequency located at 8.5 GHz. Moreover, the radiation patterns of this antenna maintain consistency across the entire operational range, exhibiting stable polar patterns and delivering highly efficient performance. Notably, the antenna demonstrates a broad gain of 3.43 dBi and an efficiency rating of 79.5%. © 2023 IEEE.

关键词： 5G-I band Compact Antenna Gain impedance bandwidth Ultra-wideband

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Variation of Atmospheric Boundary Layer Height and Application of Forward Selection Technique during Diwali 11th

Variation of Atmospheric Boundary Layer Height and Applicati...

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11th International Conference on Advances in Metrology, AdMet 2022

作者： Kumar, Nishant Soni, Kirti Agarwal, Ravinder Water Resources Management and Rural Technologies Division CSIR—Advanced Materials and Process Research Bhopal India Electrical and Instrumentation Engineering Department Thapar Institute of Engineering and Technology Punjab Patiala India

ISBN: (纸本)9789819945962

During the Diwali festival in the Delhi region, the Atmospheric Boundary Layer (ABL) height is examined in relation to pollution (caused by firecrackers) and climatic conditions. Air quality, ABL height, and Ventilation Coefficient (VC) have all been studied over the past four years as a result of firecracker use. By employing a forward selection technique, we have determined the most important factors that influence the ABL's height. The primary goal of this study is to discover the air pollution parameter that has the greatest impact on the ABL height. SOund Detection And Ranging (SODAR) has become a key tool for the continuous monitoring of ABL height. On Diwali in 2014–2017, the daily average ABL height was 300, 660, 308, and 263 m, respectively. These year's heights were about 25, 15, and 6% lower than the comparable Pre-Diwali days in 2014, 2016, and 2017, respectively;nevertheless, they were 15% higher in 2015. Mean comparisons and correlations show that the burning of firecrackers on Diwali contributes significantly to the amount of particulate matter and gaseous pollutants in the atmosphere. Using a forward selection strategy to choose the most influential parameters, the strongest correlations between meteorological variables and pollution concentrations were found. Temperature, relative humidity, wind speed, NO2, and SO2 input variables were selected based on their importance in 2014–2017 using a forward selection technique. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Atmospheric boundary layer

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Design of Image-Based Autonomous Landing instrumentation and control System for Unmanned Quadrotor Vehicles 10

Design of Image-Based Autonomous Landing Instrumentation and...

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10th IEEE Information technology International Seminar, ITIS 2024

作者： Fauzan, Ihsan M. Mukhlish, Faqihza Prayoga, Aditya Ahmad, Robby Azhari Institut Teknologi Bandung Instrumentation and Control Master Program Faculty of Industrial Technology Indonesia Institut Teknologi Bandung Engineering Physics Research Group Center for Instrumentation Technology and Automation Indonesia PT. Sas Aero Sishan Engineering Department Indonesia

ISBN: (纸本)9798331521295

The study designs an instrumentation and control system for autonomous quadrotor landing using a visual marker as the landing target. For landing process, the marker used as a landing target is an embedded ArUco marker, capable for detection for both long range and close-range detection. Position of the quadrotor relative from the ArUco marker is estimated using Perspective-N-Point pose estimation. The estimation errors compared to actual measurements are under 20 cm, which is less than the distance between ArUco border and its center. To keep camera for facing downward during the flight, the 2 axis inertially stabilization platform (ISP). The designed ISP can maintain the camera orientation even when quadrotor angle has changed. The landing control system is made for two different scenarios. First scenario is for landing with Global Positioning System (GPS) support, and the second scenario is without GPS support. The landing control system in GPS support scenario uses velocity setpoint to control the quadrotor while in without GPS support scenario, control system uses angle-thrust setpoint to control quadrotor. Quadrotor landing control system can attempt landing on top of the ArUco marker in both scenarios. The trajectory Mean Average Error (MAE) of x and y coordinates and radius of the landing process is (0.108, 0.326, 0.359) m for GPS support scenario and (0.301, 0.251, 0.436) m for without GPS support scenario. © 2024 IEEE.

关键词： Global positioning system

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A Fuzzy Logic controller for Path Navigation of Brain-controlled Mobile Robots in Complex Simulated Environments 1

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control instrumentation System Conference, CISCON 2023

作者： Bhattacharjee, Rituraj Mukherjee, Subhradip Borah, Siddhanta Department of Instrumentation and Control Engineering Manipal Institute of Technology Manipal Academy of Higher Education Karnataka Manipal576104 India Department of Electronics and Instrumentation Engineering National Institute of Technology Nagaland Nagaland Chumukedima797103 India Department of Electronics and Communication Engineering MVJ College of Engineering Bengaluru India Department of Electronics and Communication Engineering Assam Engineering College Assam Guwahati India

ISBN: (数字)9789819758661

ISBN: (纸本)9789819758654

Electroencephalogram (EEG)-based mobile robots can be powerful everyday aids for persons with severe disabilities, especially if they need assistance in moving voluntarily. With the amalgamation of EEG signal processing, artificial intelligence algorithm and mobile robotics trajectory planning, it is possible to drive a mobile robot using noninvasively recorded brain activity. In this research work, with the help of MATLAB simulations, mobile robot path navigation has been shown where the target location was retrieved using EEG signal data processing. A fuzzy logic controller has been designed and presented to conduct the obstacle avoidance mechanism based on fuzzy logic. The fuzzy logic approach has been made functional with 25 sets of rules, dictating the movement positions. The autonomous navigation system uses this position to direct the mobile robot to the intended place while avoiding collisions with outside barriers. This approach could prove very useful in effective mobile robot path planning in brand new and unpredictable situations. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Mobile robots

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Factor analysis thermography for defect detection of panel paintings

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Quantitative InfraRed Thermography Journal 2023年第1期20卷 25-37页

作者： Liu, Kaixin Huang, Kai-Lun Sfarra, Stefano Yang, Jianguo Yi, Liu Yuan, Yao Institute of Process Equipment and Control Engineering Zhejiang University of Technology Hangzhou China Department of Chemical Engineering National Tsing Hua University Hsinchu Taiwan Department of Industrial and Information Engineering and Economics University of L’Aquila L’Aquila Italy

Active infrared thermography is an important non-destructive testing method used for revealing defect structures in materials. In many applications, thermographic data processing is necessary to extract defect features from a large number of thermal images. This work proposes to use a factor analysis thermography (FAT) method that automatically extracts defect features from thermograms via exploratory factor analysis, in tandem with a fuzzy c-means (FCM) clustering algorithm to segment the defects and background. By means of factor rotation, factor analysis minimises the complexity of factor loadings and makes the results more interpretable. Consequently, the defect information is extracted while large signal-to-noise ratios are obtained. Employing the FCM image segmentation algorithm on factor loading images reduces the interference of background on human visual detection. Additionally, the parameter selection is emphasised and addressed. Experiments on a panel painting illustrate that the proposed method promotes the accuracy and efficiency of thermographic detection of defects, compared with the popular principal component thermography (PCT) method. © 2021 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Nondestructive examination

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Graph convolutional network soft sensor for process quality prediction

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Journal of process control 2023年第1期123卷 12-25页

作者： Jia, Mingwei Xu, Danya Yang, Tao Liu, Yi Yao, Yuan Institute of Process Equipment and Control Engineering Zhejiang University of Technology Hangzhou310023 China State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang110819 China Department of Chemical Engineering National Tsing Hua University Hsinchu30013 Taiwan

The nonlinear time-varying characteristics of the process industry can be modeled using numerous data-driven soft sensor methods. However, the intrinsic relationships among the variables, especially the localized spatial–temporal correlations that shed light on model behavior, have received little attention. In this study, a soft sensor based on a graph convolutional network is constructed by introducing the concept of graph to process modeling. The focus is on obtaining localized spatial–temporal correlations that aid in comprehending the intricate interactions among the variables included in the soft sensor. The model is trained by considering the regularization terms and it learns distinctive localized spatial–temporal correlations in an end-to-end manner. Furthermore, long-term dependence is established via temporal convolution. Thus, both the localized spatial–temporal correlations and time-series properties are captured. The feasibility of the proposed soft sensor is illustrated using two fermentation processes. The localized spatial–temporal correlations of this case study are visualized, and they demonstrate that the soft sensor is not a black-box model;instead, it is consistent with process knowledge. © 2023 Elsevier Ltd

关键词： Convolution

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