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Rapid visualization of latent fingerprints using novel CaSiO_3:Sm^(3+) nanophosphors fabricated via ultrasound route

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Journal of Rare Earths 2019年第1期37卷 32-44,M0003页

作者： R.B.Basavaraj G.P.Darshan B.Daruka Prasad S.C.Sharma H.Nagabhushana Prof.C.N.R.Rao Centre for Advanced Materials Tumkur University Department of Physics Acharya Institute of Graduate Studies Department of Physics B M S Institute of Technology and ManagementVTU Affiliated Department of Mechanical Engineering Jain UniversityAdvisor Jain Group of Institutions

Latent fingerprints (LFPs) were the most significant identification method for individualization. Most commonly available fingerprints (FPs) in crime spot investigation were latent and patent types. Generally,LFPs were invisible and thus the effective visualization technique necessitates for the analysis of such FPs. In the past years, many traditional visualization techniques have been employed, but suffered with low resolution, sensitivity, contrast and high background noise. To overcome such limitations, we synthesized Sm^(3+) doped CaSiO_3 nanophosphors (NPs) via an ultrasound irradiation route using mimosa pudica (m. p.)leaves extract as a bio-surfactant. The morphological behavior of the prepared samples was extensively studied by varying the concentration of the m. p. extract, ultrasound irradiation duration, pH level of the precursor solution and sonication power. The photoluminescence (PL) emission spectra exhibit characteristic peaks at～561,601 and 647 nm, which were attributed to^5G_(5/2)→~6H_J(J=5/2,7/2 and 9/2) transitions of Sm^(3+) *** Judd-Ofelt(J-O) intensity parameters and other radiative properties were estimated using PL data. The Commission International de I'Eclairage (CIE) color coordinates were positioned in orange-red region shows average correlated color temperature (CCT) value of～3576 K. The optimized samples can be used as a labeling agent for the visualization of LFPs on various porous and non-porous surfaces under normal light irradiation. The visualized FPs reveals well defined ridge characteristics, namely whorl, loop,arch, bifurcation, eye, island, bridge, sweat pores, etc, with high sensitivity, selectivity, low contrast and background hindrance. Aforementioned results evidence that the prepared CaSiO_3:Sm^(3+) NPs were promising luminescent materials for solid state lighting and forensic applications.

关键词： Ultrasonication,synthesis Photoluminescence Fingerprint Photometric properties Judd-Ofelt analysis Rare earths

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Localization through RGB-D Camera for the Quad-rotor 15

Localization through RGB-D Camera for the Quad-rotor

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15th International Conference on Computing Communication and Networking Technologies, ICCCNT 2024

作者： Prabhakar, Vidit Datt Pandey, Vijay Kumar Sharma, Anuj Kumar Sandhan, Tushar Centre for Advanced Studies AKTU Department of Mechatronics Lucknow India Indian Institute of Technology Department of Electrical Engineering Kanpur India

ISBN: (纸本)9798350370249

This paper presents a thorough investigation into the implementation of a localization system using a RGB-D camera that prioritizes computational efficiency. The study focuses on utilizing the Oak D Pro depth camera, which includes an in-built Inertial Measurement Unit. Visual Odometry is used to estimate the camera pose which is lighter in computation than other algorithms like Simultaneous Localization and Mapping. The IMU is used to obtain the camera pose due to the presence of drift during the camera's fast motion. The readings are fused together to get the correct camera pose by employing the Extended Kalman Filter for sensor fusion, achieving seamless integration of VO and IMU. This research explores the adaptation of Visual Inertial Odometry system for an autonomous Unmanned Aerial Vehicles applications, specifically for a quad-rotor/drone. © 2024 IEEE.

关键词： Extended Kalman filters

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A basic overview on brake disc wear

A basic overview on brake disc wear

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International Body engineering Conference and Exhibition and Automotive and Transportation technology Conference

作者： Dante, Roberto C. Navire, Carlo Monterrey Technology Institute and Advanced Studies Campus of Mexico City Mexico Phoebus Tech. Engineering Inc. Isibond

Wear of brake disc is normally faced with sophisticated experimental methods, a basic overview on the phenomena related to disc wear is presented in this paper. DTV consists in a heterogeneous wear of the disc surface and it is caused by two factors: run-out and the mechanism of disc wear. The importance of DTV is due to the vehicle vibrations that high DTV values can cause during braking. A model, that considers iron oxide layer evolution on disc surface, can evidence some of the principal characteristics of disc wear. In this model the wear rates of disc gray cast iron and iron oxide layer are considered as some of the principal factors in DTV evolution, as well as the kinetics of the chemical reactions involved. Copyright © 2002 Society of Automotive Engineers, Inc.

关键词： Iron oxides

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Implementation of 1553B bus protocol on FPGA board using digital phase lock loop

Implementation of 1553B bus protocol on FPGA board using dig...

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2012 International Conference on Emerging Technologies, ICET 2012

作者： Yousaf, Jawad Irshad, Mohsin Mehmood, Iftekhar Institute of Space Technology Islamabad Pakistan University of Western Ontario London ON Canada Center for Advanced Studies in Engineering Islamabad Pakistan

ISBN: (纸本)9781467344517

In this paper, a new technique for the implementation of MIL-STD-1553B bus protocol on FPGA board using digital phase lock loop is presented. Digital phase lock loop (DPLL) is used for data clock recovery from encoded manchester data of the channel at receiver end, instead of implementing common practice of initiating a separate clock for encoded manchester data processing. Usage of DPLL, resolves the synchronization issues, a major concern in high data rate embedded systems and increases the integrity and reliability of the system. Proof of concept is validated by implementing a 1553B bus transaction (BC to RT) on FPGA board with its different modules like UART, Bus controller, Manchester encoder/decoder and Digital phase lock loop. © 2012 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Psoriasis Skin Disease Identification Using Support Vector Machine(SVM) Image Classification and Determining the Growth Rate 8

Psoriasis Skin Disease Identification Using Support Vector M...

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8th International Virtual Conference on Biosignals, Images, and Instrumentation, ICBSII 2022

作者： Thamizhvani, T.R. Ajayan, Aparna K Sannidhya, V. Hemalatha, R.J. Chandrasekaran, R. Department of Biomedical Engineering Vel's Institute of Science Technology and Advanced Studies Tamil Nadu Chennai600 117 India

In the Indian population, a larger part is under the subsistence level. Most of the people are living in areas of poor sanitation and have very little access to good medical facilities. From time to time, they don't have the notice to go to a physician at the absolute time. The condition has been defined as a skin disorder or disease wherever there is a failure to induce the right identification and treatment in time typically ends up in advanced stages. Skin diseases tend to be itchy and cover the body easily. Among them, Psoriasis exists as a chronic inflammatory disease characterized by scaly patches on the skin. The proposed system focuses on SVM segmentation and scaling of 2D processed skin pore images of Psoriasis. The Feature Scaling Technique uses color, contrast, and image texture along with a combination of SVM classification features to diagnose and come up with a treatment solution. This computer-assisted image processing system removes erythematous from the psoriasis image for analysis and determination of growth rate. Therefore, earlier identification cuts back the symptoms of the illness and helps in developing a condition that indulges the strategies to live along with the disease condition called Psoriasis. © Published under licence by IOP Publishing Ltd.

关键词： Support vector machines

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Pulse generation of erbium-doped fiber laser based on liquid-exfoliated FePS3

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Chinese Physics B 2019年第8期28卷 172-178页

作者： Qing Yin Jin Wang Xin-Yao Shi Tao Wang Jie Yang Xin-Xin Zhao Zhen-Jiang Shen Jian Wu Kai Zhang Pu Zhou Zong-Fu Jiang Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123China College of Advanced Interdisciplinary StudiesNational University of Defense TechnologyChangsha 410073China i-Lab Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China College of Physics and Electronic Engineering Hainan Normal UniversityHaikou 571158China

As a preferable material in the field of photo-detection and catalysis,the characteristics of FePS3 in broad wavelength range have been proven by many experimental ***,FePS3 has not been used as a saturable absorber(SA)in fiber lasers *** propose and demonstrate the generation of a single wavelength and dual-wavelength based on an Er-doped fiber laser(EDFL)at 1.5μm by using an innovative FePS3 saturable absorber for the first *** result shows that a stable passively Q-switched pulse can be generated,which demonstrates that the new two-dimensional(2D)material FePS3 served as SA provides a valid method to realize passively Q-switched *** addition,we achieve the output of the dual-wavelength pulse by properly rotating the polarization *** the best of our knowledge,the dual-wavelength pulse EDFL could be applied in biomedicine,spectroscopy,and sensing research.

关键词： fiber laser Q-switched FePS3

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Detection of Irregular Shapes Resembling Non-Uniform Gaps for UAV Navigation 15

Detection of Irregular Shapes Resembling Non-Uniform Gaps fo...

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15th International Conference on Computing Communication and Networking Technologies, ICCCNT 2024

作者： Singh, Shashi Kumar Sharma, Anuj Kumar Sandhan, Tushar Aktu Centre For Advanced Studies Department of Mechatronics Lucknow India Indian Institute of Technology Department of Electrical Engineering Kanpur India

ISBN: (纸本)9798350370249

This research paper presents a novel approach for the detection and segmentation of non-uniform gaps to facilitate safe autonomous navigation of UAVs (Unmanned Aerial Vehicles) using the YOLOv8 deep learning model. The methodology comprises three key stages: data collection, annotation, and model training using the YOLOv8 architecture. Initially, the model is trained on regular shapes images such as lines, triangles, quadrilateral and hexagons which also resembles the many real-world scenarios to establish a foundational understanding before transitioning to non-uniform gaps. We solved the problem of data scarcity through synthetic to natural data training process. Non-uniform gaps, simulated to real-world, data is meticulously annotated to train the YOLOv8 model, ensuring robustness across diverse scenarios. A post-processing step is introduced to find the centroid of the segmentation mask of detected gaps, providing actionable guidance for UAV maneuvering with proper clearance. Experimental results demonstrate the efficacy of the proposed approach in accurately detecting and segmenting non-uniform gaps, showcasing its potential for real-world deployment in various applications. This research contributes to advancing UAVs navigation by providing a reliable solution for safe passage through complex environments. © 2024 IEEE.

关键词： CNN-based detection and segmentation Non-uniform gaps Regular shapes UAVs

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On-site Testing and Preventive Maintenance for a Fire Automation System Employing PSO, FA and ANN Algorithms 1

On-site Testing and Preventive Maintenance for a Fire Automa...

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1st IEEE International Conference on Emerging Research in Computational Science, ICERCS 2023

作者： Rubini, B. Kalaiarasi, G. Vasuki, S. Pradeep Kumar, S. Murugan, Suganiya Arul Stephen, C. Vels Institute of Science Technology and Advanced Studies Department of Electrical and Electronics Engineering Pallavaram Chennai India Vignan Foundation for Science Technology and Research Deemed to Be University Department of Advanced Computer Science and Engineering Andhrapradesh Guntur India M. Kumarasamy College of Engineering Department of Electronics and Communication Engineering Tamilnadu Karur India Srm Institute of Science and Technology Department of Computing Technologies Kaattankulathur Chennai India Vels Institute of Science Technology and Advanced Studies Department of Electronics and Communication Engineering Pallavaram Chennai India

ISBN: (纸本)9798350359756

engineering elements influencing in commercial and government buildings fire safety rendition buildings have been deliberated. For both new and existing buildings, all variables such as structure of building, damage due to fire from prevention compartments, Time of incidents evacuation routes should be control leverage on people's evacuation routes, controlled, and additional standard fire protection equipment are imposed. This page outlines the classes of diesel fire pumps, batteries, and pumping systems, besides the elements prompting fire rendition. Onsite diesel generator pump must be connected to a hydrant and the water pumping pressure range must be customized to 8 bar using a pressure gauge. The substantive intent of this concert is to reinforce firefighter safety. Only experienced technicians and training professionals in fire guard are responsible for this part. To simulate the battery tightness position, an extra-critical condition has been considered. Owing to the position of the fire safety properties and battery reaction in buildings, the Firefly and Particle Swarm optimization algorithms have been exerted on the iterations with objective values used for analysis in the iterative process using Matlab 2021 software. Two well-known algorithms are compared to see which provides the best results. The ANN serves as a tool for analyzing and optimizing the pump's rendition in maintaining an adequate water supply for fire emergencies. © 2023 IEEE.

关键词： Fires

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Ag_(24)Au cluster decorated mesoporous Co_(3)O_(4)for highly selective and efficient photothermal CO_(2)hydrogenation

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Nano Research 2022年第6期15卷 4965-4972页

作者： Yan Xiong Xu Liu Yi Hu Dong Gu Minghang Jiang Zuoxiu Tie Zhong Jin MOE Key Laboratory of Mesoscopic Chemistry MOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Suzhou Tierui New Energy Technology Co.Ltd. Suzhou 215228China The Institute for Advanced Studies Wuhan UniversityWuhan 430072China

Photothermal carbon dioxide hydrogenation represents a promising route to reduce the emission of greenhouse gas CO_(2)and produce value-added chemicals,but the selectivity and stability of photothermal catalysts need to be ***,we report the rational fabrication of well-defined Ag_(24)Au cluster decorated highly ordered nanorod-like mesoporous Co_(3)O_(4)(Ag_(24)Au/mesoCo_(3)O_(4))for highly efficient and selective CO_(2)*** orderly assembled meso-Co_(3)O_(4)nanorods were prepared via a nanocasting method,offering large surface area and abundant active sites for CO_(2)adsorption and ***,the catalytic activity and selectivity were further improved by molecule-like Ag_(24)Au cluster decoration and reaction temperature *** Ag_(24)Au/meso-Co_(3)O_(4)composite catalyst exhibited an ultrahigh CH_(4)yield rate of 204 mmol·g^(−1)·h^(−1)and a greatly improved CH_(4)selectivity of 82%for CO_(2)hydrogenation,significantly higher than those of pristine meso-Co_(3)O_(4)*** mechanism of the photothermal catalytic performance improvement was verified by CO_(2)temperature-programmed desorption and time-resolved transient photoluminescence,revealing that CO_(2)molecules underwent a vigorous adsorption and rapid activation process over Ag_(24)Au/meso-Co_(3)O_(4).The hot electrons created by the localized surface plasmon resonance effect of Ag_(24)Au clusters facilitated the charge transfer for subsequent multi-electron CO_(2)hydrogeneration processes,resulting in a significant increase in the productivity and selectivity for CO_(2)-to-CH_(4)*** work suggests that the rational coupling of well-defined metal atom clusters and ordered transition metal compound nanostructures could open a new avenue towards photoinduced green chemistry processes for efficient CO_(2)recycling and reutilization.

关键词： mesoporous Co_(3)O_(4) Ag_(24)Au clusters CO_(2)hydrogenation photothermal catalytic

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Optimization of dissimilar aluminum alloy by friction stir welding process control variables with multiple objectives 1

Optimization of dissimilar aluminum alloy by friction stir w...

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1st International Conference on Physics and Energy 2021, ICPAE 2021

作者： Kumar, S.D. Pugazhenthi, R. Danial, S. Ajith Arul Swaminathan, G. Department of Mechanical Engineering Department of Mechanical Engineering Vels Institute of Science and Technology and Advanced Studies Chennai-117 India Department of Mechanical Engineering SRM Institute of Science and Technology Ramapuram Campus Chennai-89 India

The progress of FSW has offered a different approach for fabricating superior class weld. This paper deals with optimization of process control variables influencing weld features in customized friction stir butt welding having multiple objectives of 6 mm thick dissimilar plates of AA7075 and AA6101 using Taguchi grey relational approach. The L27 orthogonal array has been employed to Obtain the experimental trails and the joints have been fabricated in a laboratory stage friction stir welding equipment by changing tool rotation speed, worktable translational speed, tool plunge force and tool pin shape. After welding, tensile and impact strength of the weld have been evaluated and found that optimum ultimate tensile strength of 129 Mpa., maximum yield strength of 119.21Mpa, maximum % of elongation 24.64% and impact strength 23Mpa simultaneously in FSW process variables of Tool rotation speed is 1200 rpm, transvers speed of 30 mm/min and axial force is at 5 kN. Based on the experimental results optimum levels of process control variables were obtained using grey relation rating and compared with confirmation test. © 2021 institute of Physics Publishing. All rights reserved.

关键词： Friction stir welding

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