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Visualization of Methamphetamine-Contaminated Fingermarks on Glass Surfaces by Field Emission Scanning Electron Microscope for Forensic Investigation

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Journal of Forensic Science and Medicine 2023年第1期9卷 6-11页

作者： Sarah Aliah Amir Sarifudin Kah Haw Chang Bee Ee Khoo Ahmad Fahmi Lim Abdullah Forensic Science Program School of Health SciencesHealth CampusUniversiti Sains MalaysiaKelantanMalaysia Mechatronic Engineering Program School of Electrical and Electronic EngineeringEngineering CampusUniversiti Sains MalaysiaPenangMalaysia

Background:Fingermark is an individual’s primary identification *** is helpful in determining individuals involved in illegal activities and is frequently encountered in clandestine *** forensic investigation,the critical question to be answered is whether a fingermark was left on a surface before or after the initiation of an unlawful *** and Objectives:This study aimed to investigate the visualization of methamphetamine-contaminated fingermarks on glass surfaces and estimate the immediacy of their *** and Methods:In this study,the prior-deposition contaminated fingermarks,i.e.,fingermarks deposited a surface priorly contaminated by methamphetamine,and the postdeposition contaminated fingermarks,i.e.,fingermarks deposited on a clean surface but subsequently contaminated with methamphetamine were visualized and compared using Field Emission Scanning Electron Microscope(FESEM).Results:Under FESEM,the latent fingermarks and the crystalline structure of methamphetamine were clearly *** postdeposition contaminated fingermarks appeared in smudge conditions in all the three replicate samples,where the ridge and nonridge areas could not be *** the contrary,the prior-deposition contaminated fingermark demonstrated distinct separations between ridges and ***,the application of fingerprint powders reduced the possibility to determine the immediacy of ***:To conclude,both prior-deposition contaminated fingermarks and postdeposition contaminated fingermarks can be discriminated,providing information on the instance when a fingermark was left on a surface.

关键词： Fingermark methamphetamine scanning electron microscope visualization powder

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Control engineering investigation of the effects of proliferative diabetic retinopathy on the crystalline lens and ciliary muscle dynamic behavior

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Research on Biomedical engineering 2023年第3期39卷 663-676页

作者： Oliveira, Rebeca Hannah de M. Silva, Mayla dos S. Nunes, Gustavo A. M. A. Faria, Rafael Mendes Santos, Kleriston Silva Rosa, Leandro L. F. Rosa, Mário F. F. Rosa, Suélia de S. R. F. Department of Biomedical Engineering Johns Hopkins University School of Medicine BaltimoreMD United States Postgraduate Program in Mechatronic Systems University of Brasília DF Brasilia Brazil Optometry Clinic GO Goiânia Brazil Biomedical Engineering Graduate Program University of Brasília DF Brasilia Brazil University of Brasilia – UnB DF Brasilia Brazil

Purpose: Proliferative diabetic retinopathy (PDR) affects more than 100 million adults worldwide and is one of the primary diseases leading to blindness and affecting the eye’s retina. Few papers mention its impact on the anterior segment of the eye. Methods: We present a novel bond graph model of the human eye calibrated with data from the literature to simulate the effects of retinopathy on lens behavior. Through mathematical representation in state space and transfer functions, we simulate the dynamic responses of the physiological and pathological systems. Results: The dynamic response to impulse inputs shows a distinct peak amplitude (0.01 difference) and transient time (0.0001 s) for PDR and Healthy systems at Region B (lens and ciliary muscle). Qualitative increase in ocular vasculature aggravation attenuates PDR dynamic response to unitary step input compared to Healthy (50% decay at 20 days of simulation) at Region B. Conclusions: The model suggests the potential impact of PDR on ciliary muscle behavior, which can have a clinical translation on diagnosis, follow-up, and treatment of the disease. It can be used for future studies on the effects of retinopathy on different ocular regions. © 2023, The Author(s), under exclusive licence to The Brazilian Society of Biomedical engineering.

关键词： Eye protection

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Automated Box Classification in a Virtual Industrial Environment Using Machine Vision Algorithms

Automated Box Classification in a Virtual Industrial Environ...

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International Conference on Control, mechatronics and Automation (ICCMA)

作者： Juan C. Guacheta-Alba Anny Astrid Espitia Cubillos Robinson Jimenez Moreno Mechanical Engineering Program Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil Industrial Engineering Program Universidad Militar Nueva Granada Bogotá Colombia Mechatronic Engineering Program Universidad Militar Nueva Granada Bogotá Colombia

ISBN: (数字)9798331517519

ISBN: (纸本)9798331517526

This article presents the development and evaluation of an automated system for box classification based on the detection of some ISO 780:2015 symbols, using a UR5 robotic manipulator and advanced machine vision techniques. The methodology integrates sensors, vision algorithms, and robotics to achieve precise classification. The UR5 manipulator, with six degrees of freedom, was kinematically modeled using Denavit-Hartenberg parameters, allowing for the calculation of the end-effector’s position and orientation. The system employs the Speeded-Up Robust Features (SURF) algorithm for the detection and classification of symbols on the boxes. Simulation results in CoppeliaSim, processed in MATLAB, reveal an average detection time of 55 milliseconds and a recognition rate exceeding 95%, even under varying lighting and orientation conditions. The system demonstrates high precision and flexibility in handling boxes of different sizes and arrangements, validating its efficiency in automated virtual industrial environments.

关键词： Accuracy Service robots Machine vision Heuristic algorithms Robot kinematics Symbols Lighting Robot sensing systems Classification algorithms Trajectory

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Comparison between FLL and PLL in frequency estimation to supply distributed virtual inertia

Renewable Energy and Power Quality Journal

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Renewable Energy and Power Quality Journal 2024年第1期22卷 111-116页

作者： Novoa, Erland Tafur, Julio C. Rosas, Damian Sal Y. Department of Engineering-Mechatronic Engineering Master Degree Program Pontificia Universidad Católica del Perú Peru Department of Engineering-Control and Automation Engineering Master Degree Program Pontificia Universidad Católica del Perú Peru LAAS-CNRS University of Toulouse Toulouse31031 France

To connect renewable energy sources (e.g. solar or wind) on the grid, an inverter or electronic converter is used. However, a traditional inverter has no inertia in the face of frequency changes. Unlike the inertia of the rotor of a synchronous generator. Frequency variations are a product of the imbalance between the energy generated and the grid loads. If the frequency is too far from its nominal value or if the rate of change of frequency (RoCoF) is high, it can affect the synchronism of the generators that feed the grid. Therefore, power cuts are made in sectors on the grid, thus preventing instability from spreading to other sectors on the grid, which translates into large economic losses. Solutions such as inverters with virtual inertia (or emulated inertia) are a good alternative due to their structural simplicity and low cost, compared to other solutions such as synchronous condensers, for example. For the virtual inertial control strategy, the grid frequency needs to be measured. This article compares the use of a phase-locked loop (PLL) or a frequency-locked loop (FLL) for frequency estimation and its effect on inertia emulation. The proposed control designs are validated through simulations. © 2024, European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ). All rights reserved.

关键词： Phase locked loops

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Characterization of Quasi-Bound State in the Continuum Structures for Terahertz Band Applications

Characterization of Quasi-Bound State in the Continuum Struc...

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International Conference on Infrared and Millimeter Waves

作者： Fang-Jou Wang Yi-An Wei Bo-Chien Peng Chin-Pao Cheng Chan-Shan Yang Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei Taiwan Department of Mechatronic Engineering National Taiwan Normal University Taipei Taiwan

ISBN: (数字)9798350370324

ISBN: (纸本)9798350370331

The Bound State in the Continuum (BIC) has gained widespread attention, yet conventional metasurfaces often suffer from significant Ohmic losses due to metallic structures. In contrast, our groundbreaking THz resonance modulator, crafted from pure PMMA and ceramic materials using advanced CNC machining, represents a novel approach. This digital manufacturing method allows unparalleled flexibility, resulting in high-quality THz modulators with superior performance and efficiency. By overcoming the limitations of metallic structures, our suspended grating structure achieves a high Q-factor, crucial for optimizing vibrational efficiency. This advancement marks a pivotal moment in THz technology, promising a bright future for applications in communication and sensing.

关键词： Q-factor Modulation Machining Metasurfaces Resonance Sensors Manufacturing Ceramics Gratings Terahertz communications

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Intelligent and Optimal System for Monitoring Environmental Variables and Solar Luminosity, with solar path tracker and telemetry

Renewable Energy and Power Quality Journal

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Renewable Energy and Power Quality Journal 2024年第5期22卷 43-48页

作者： Alan Calderón Ch, J. Gamarra, Benjamín Barriga Tafur Sotelo, Julio C. Ugarte, Fernando Jiménez Applied Nanophysics Institute for Physics Technical University of Ilmenau Ilmenau98693 Germany Control Engineering and Automation Master Program Mechatronic Engineering Master Program Energy laboratory Engineering Department Pontificia Universidad Católica del Perú Peru Aplicaciones Avanzadas en Sistema Mecatrónicos JACH S. A. C

In this proposed research are analyzed general solutions and techniques to optimize the solar luminosity measurement by a designed smart system, as well as its usability by the solar energy conversion and its storing. However, many times, this kind of systems have not an optimal solar path tracker and as a consequence it can not be measured the full solar luminosity during all the day, therefore, in this work are designed optimal mathematical models and algorithms to enhance the solar path tracker according to measure solar luminosity and getting optimal solar energy conversion/storing, which is useful to study geographical conditions before to build solar energy conversion centers. As well as, in this research also is studied and suggested some techniques to get wireless data communication regarding the measured environmental variables, measured solar luminosity and stored electrical energy as a consequence of the solar energy conversion, which can be transmitted, so far away, to a central monitoring center by Radio Frequency (RF) waves. © 2024, European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ). All rights reserved.

关键词： energy-saving Modulating Function (MF) nanostructures smart sensors Solar path tracker transducers wireless data transmission

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Characterization of a new triaxial nanofiber membrane and osteogenic differentiation capacity of human bone marrow mesenchymal stem cells for bone repair

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Journal of Materials Research 2025年 1-18页

作者： Altundag-Erdogan, Özlem Çetinkaya, Hayrullah Çelebi-Saltik, Betül Altun, Belgin Şahin, Mehtap Mağden, Gamze Kara Öteyaka, Mustafa Özgür Department of Stem Cell Sciences Graduate School of Health Sciences and Center for Stem Cell Research and Development Hacettepe University Sihhiye Ankara06100 Turkey Department of Chemical Engineering Eskisehir Osmangazi University Eskişehir26040 Turkey Vocational School Health Services Hacettepe University Sihhiye Ankara06100 Turkey BUGAMED Biotechnology Industry and Trade Inc Eskişehir26380 Turkey Eskişehir Vocational School Electronics and Automation Eskisehir Osmangazi University Mechatronic Program Eskişehir26250 Turkey

A triaxial nanofiber membrane was developed using a custom triaxial nozzle during electrospinning. The membrane consisted of three layers (outer middle (PVA-Collagen Type I-BMP-2), and inner (PVA-nHAP)). TEM revealed the diameters of the outer, middle, and inner layers as 167.5, 142.6, and 119.3 nm, respectively. The triaxial nanofiber membrane exhibited superior tensile strength (36 MPa) and elastic modulus (2.5 GPa), along with a roughness of 359 nm and hydrophilic properties. In addition, it demonstrated a 200% swelling ratio and reduced bacterial colonization by 10.8-fold. Both Calcium deposition and ALP activity were significantly higher and increased expression of BSP (eightfold), OCN (13-fold), and OPN (488-fold) genes were observed in membrane + OST groups (p © The Author(s), under exclusive licence to The Materials Research Society 2025.

关键词： Bone

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Experimental Study of a Flat Solar Collector with Thermal Energy Storage, Applying Improvements Based on Bibliometric Review and CAD Simulation 4th

Experimental Study of a Flat Solar Collector with Thermal En...

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4th International Conference on Applied Technologies, ICAT 2022

作者： Rincon-Quintero, A.D. Rondon-Romero, W.L. Maradey-Lazaro, J.G. Lengerke, O. Sandoval-Rodriguez, C.L. Acosta-Cardenas, O.A. Faculty of Natural Sciences and Engineering Unidades Tecnológicas de Santander Student Street 9-82 Bucaramanga680005 Colombia Department of Energy Engineering University of the Basque Country Plaza Ingeniero Torres Quevedo nº1 Bilbao48013 Spain Mechatronic Engineering Program Universidad Autónoma de Bucaramanga Avenida 42#48-11 Cabecera del Llano Bucaramanga680003 Colombia

ISBN: (纸本)9783031249709

The research shows the development process of a 3 m2 flat solar collector, composed of three modules of 1 m2 each, with labyrinth trap geometry, turbulence ridges and thermal energy storage tanks, the latter using different types of phase change materials (PCM), specifically two types of paraffins with melting points in the range of 48 to 58 ℃. Additionally, one of its modules filled with motor oil. During the first phase, a bibliometric exploration methodology is carried out with VOSviewer Software, identifying prominent technologies in the subject, which allows the design and simulation of a prototype using CAD Software. Subsequently, when implementing it, an analysis of the behavior of the vacuum collector with respect to the use of thermal energy storage is carried out, identifying the advantages in the use of PCM. Among the results, a working power close to 450 W and an approximate efficiency of 25% stand out, contrasting with the simulation, the importance of PCMs in increasing the efficiency of these devices used in different applications is concluded. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Thermal energy

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Simulation and Experiment of a Boost Converter With Four-Layer Voltage Multipliers

Simulation and Experiment of a Boost Converter With Four-Lay...

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Mediterranean Electrotechnical Conference (MELECON)

作者： Wei-Cheng Lin Mei-Yung Chen Kai-Jun Pai Department of Mechatronic Engineering National Taiwan Normal University Taipei Taiwan R.O.C. Undergraduate Program of Vehicle and Energy Engineering National Taiwan Normal University Taipei Taiwan R.O.C.

ISBN: (数字)9798350387025

ISBN: (纸本)9798350387032

This study developed a boost converter with four-layer voltage multipliers. Compared to the proposed power topology with the traditional boost converter, the high boost conversion ratio can be achieved and the voltage stress on the power switch can be reduced. In this study, the boost converter incorporated four-layer voltage multipliers, all inductors were operated in the continuous conduction mode. Moreover, a commercial pulse-width modulation controller was used to control the boost converter with the voltage multipliers. Using the circuit simulation software − PSIM, the circuit element parameters were developed and designed.

关键词： Circuit simulation Prototypes Modulation Switches Software Topology Timing

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Terahertz characterization of functional composite material based on ABS mixed with ceramic powder

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Optical Materials Express 2023年第9期13卷 2622-2632页

作者： Peng, Hsin Y.I. Wei, Y.I.-A.N. Lin, K.A.O.-C.H.I. Hsu, S.H.E.N.-F.U. Chen, J.Y.H.-C.H.E.R.N. Cheng, C.H.I.N.-P.A.O. Yang, C.H.A.N.-S.H.A.N. Department of Mechatronic Engineering National Taiwan Normal University Taipei 106010 Taiwan Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei 11677 Taiwan Center for Measurement Standards Industrial Technology Research Institute Hsinchu 31040 Taiwan Advanced ACEBiotek Co. Ltd. Hsinchu 30261 Taiwan Micro/Nano Device Inspection and Research Center National Taiwan Normal University Taipei 106 Taiwan

Terahertz (THz) radiation is especially the frequency band that the developers of sixth-generation wireless communication networks aim to exploit. Thus, the research and development of relevant components have been an important issue. Studies have shown that ceramic materials demonstrate the properties of low optical loss and high refractive index when subjected to THz radiation. Furthermore, when a ceramic material is mixed into a polymeric material, it can effectively improve the latter’s mechanical strength. Therefore, in this study, we conducted heat treatment on the powders of four ceramic materials: Al2O3, SiO2, ZrSiO4, and quartz. Next, we respectively mixed each powder of the ceramic materials into each powder of acrylonitrile butadiene styrene (ABS). Then, we measured all the mixtures’ optic properties under THz radiation by observing their X-ray diffraction patterns. Measurement results indicated that SiO2 had a phase transition when it was calcined to 1100°C, and its optical coefficient also changed with the phase transition. After ABS was mixed with a ceramic material, the mixture’s effective refractive index increased as the mixture was subjected to THz radiation. Moreover, after ABS was mixed with Al2O3, quartz, heat-treated Al₂O₃, heat-treated quartz, and heat-treated SiO₂, the mixtures’ effective refractive index increased, and their absorption coefficients decreased. Therefore, mixing a specific ceramic material into ABS, a common polymer, can not only improve the mechanical performance of ABS but also give ABS fine optical properties such as an increased effective refractive index and a decreased absorption coefficient under THz radiation. © 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Absorption coefficient Aluminum oxide Composite materials Effective medium theory Effective refractive index Refractive index

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