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3rd IEEE Industrial Electronics Society Annual On-Line Conference, ONCON 2024

作者： Bhowmick, Supratik Chakraborty, Soham Maiti, Suman Indian Institute of Technology Kharagpur Department of Electrical Engineering Kharagpur721302 India Calcutta University UG Program of Electrical Engineering Department of Applied Physics Kolkata700009 India

ISBN: (纸本)9798331540319

This paper proposes a pulse skipping based combined frequency and duty ratio control for a series resonant converter which is targeted for voltage regulator applications. The proposed pulse skipping control combines duty ratio based phase shifted control for maintaining output voltage at its reference value, along with frequency based control which assists in development of the pulse skipping algorithm. This algorithm is structured so that pulses are skipped in generated gate pulses for upper switching devices present in the converter whenever the output voltage tries to be higher than its specified maximum value or be lower than its specified minimum value. These maximum and minimum voltages are determined based on its reference voltage and allowable voltage ripple within which the oscillations in output voltage are desired to be in. The converter system with the proposed control method is simulated in MATLAB/Simulink environment to validate its performance under transient conditions e.g., variation in load resistance and output voltage reference. The system performance with proposed method is also compared with conventional method where the proposed control demonstrates its superiority by significantly minimizing the output voltage ripple. © 2024 IEEE.

关键词： Resonant converters

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Migration and proliferation drive the emergence of patterns in co-cultures of differentiating vascular progenitor cells

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Mathematical Biosciences and engineering 2024年第8期21卷 6731-6757页

作者： Zamora Alvarado, Jose E. McCloskey, Kara E. Gopinathan, Ajay School of Engineering University of California Merced MercedCA95343 United States Graduate Program in Materials and Biomaterials Science and Engineering University of California Merced MercedCA95343 United States Department of Physics University of California Merced MercedCA95343 United States

Vascular cells self-organize into unique structures guided by cell proliferation, migration, and/or differentiation from neighboring cells, mechanical factors, and/or soluble signals. However, the relative contribution of each of these factors remains unclear. Our objective was to develop a computational model to explore the different factors affecting the emerging micropatterns in 2D. This was accomplished by developing a stochastic on-lattice population-based model starting with vascular progenitor cells with the potential to proliferate, migrate, and/or differentiate into either endothelial cells or smooth muscle cells. The simulation results yielded patterns that were qualitatively and quantitatively consistent with experimental observations. Our results suggested that post-differentiation cell migration and proliferation when balanced could generate between 30–70% of each cell type enabling the formation of vascular patterns. Moreover, the cell-to-cell sensing could enhance the robustness of this patterning. These findings computationally supported that 2D patterning is mechanistically similar to current microfluidic platforms that take advantage of the migration-directed self-assembly of mature endothelial and mural cells to generate perfusable 3D vasculature in permissible hydrogel environments and suggest that stem or progenitor cells may not be fully necessary components in many tissue formations like those formed by vasculogenesis. ©2024 the Author(s)

关键词： Endothelial cells

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Measurement of ionization produced by 254 eVnr nuclear recoils in germanium

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Physical Review D 2024年第8期110卷 083043页

作者： A. R. L. Kavner I. Jovanovic Applied Physics Program Department of Nuclear Engineering and Radiological Sciences

Ionization produced by low-energy nuclear recoils is among the primary direct signatures of dark matter interactions. Despite the urgency of dark matter detection and the recent measurements of coherent elastic neutrino-nucleus scattering, detector response to nuclear recoils is not well characterized in the keVnr and sub−keVnr regime across a variety of materials. We have reperformed a measurement of the ionization produced by monoenergetic 254 eVnr nuclear recoils in Ge with improved digital electronics and additional systematic studies. Our results indicate an ionization yield of 64±8 eVee corresponding to a quenching factor of 25%±3%, greater than the 14% predicted by the Lindhard model. This ionization enhancement could greatly improve the sensitivity of high-purity Ge detectors in dark matter detection and measurement of neutrinos via coherent scattering.

关键词： Dark matter Dark matter direct detection Energy levels Neutron physics Nuclear astrophysics Particle dark matter

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Numeracy literacy ability in atomic wave physics spectrum practicum activities among prospective physics teachers 1

Numeracy literacy ability in atomic wave physics spectrum pr...

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1st International Seminar on physics and Its Application, IsoPA 2024

作者： Sunarti, T. Wasis Jauhariyah, M.N.R. Setyarsih, W. Zainuddin, A. Zakaria, A. Hakim, S.R. Wandhira, R. Physics Education Study Program Universitas Negeri Surabaya Surabaya Indonesia Department of Electrical and Electronics Engineering Universitas Negeri Yogyakarta Yogyakarta Indonesia

This research aims to determine the level of numeracy literacy skills of prospective physics teachers. This research uses descriptive research with a quantitative approach. The subjects of this research were prospective physics teachers who took part in waves courses and electromagnetic wave spectrum practicums in the physics education study program at Surabaya State University in 2 classes, with 23 people in each class. The instruments used are 3 test questions that measure literacy skills (finding information, interpreting, evaluating) and 8 questions that measure numeracy skills, namely, numeracy, reasoning, and application. The research data was analyzed quantitatively and descriptively. The results of the research showed that variations in the level of numeracy literacy skills before the atomic spectrum practicum activity were in the basic category, with an average of 49.5% of students having answered correctly as many as 46 students, then they were given treatment by carrying out EM wave practicum, the numeracy literacy abilities of students after being given the treatment were in the category requiring special intervention, there were 5 people, in the basic category there were 10 people, in the advanced category there were 18 people. In the very advanced category, there were 7 people. Overall, students have quite good abilities in finding information, interpreting information, evaluating information, and understanding information, which is in the advanced category with a percentage of correct answers of 74.12%, 72.98%, 72.70%, and 71, respectively. At the same time, the indicators of applying information and reasoning are still in the basic category at 32.46%. So, it can be concluded that students' numeracy literacy skills are quite good. However, several other treatments are still needed to improve literacy and numeracy skills. © 2024 Institute of physics Publishing. All rights reserved.

关键词： Students

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Chiral phonon-induced magnetization in cerium fluorides

Chiral phonon-induced magnetization in cerium fluorides

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Luo, Jiaming Lin, Tong Zhang, Junjie Chen, Xiaotong Blackert, Elizabeth R. Xu, Rui Yakobson, Boris I. Zhu, Hanyu Department of Materials Science and Nano Engineering Rice University Houston United States Applied Physics Graduate Program Rice University Houston United States

We report that circularly polarized terahertz light pulses can drive chiral phonons, which then induce an effective quasi-static magnetic field on the order of 1 tesla to polarize the paramagnetic cerium fluoride. ... 详细信息

ISBN: (纸本)9781957171395

关键词： Phonons

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Comment on "Electrical Switch of Poisson's Ratio in IV-VI Monolayers via Pseudophase Transitions"

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JOURNAL OF PHYSICAL CHEMISTRY LETTERS 2022年第16期13卷 3609-3610页

作者： Jangir, Arun Ho, Duc Tam Schwingenschlogl, Udo Applied Physics Program Physical Science and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia

Significant modulation of Poisson's ratio of IV-VI semiconductor monolayers in an electric field was claimed to be discovered by first-principles calculations in The Journal of Physical Chemistry Letters, 2021,12,... 详细信息

关键词： Monolayers

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Potato Leaf Disease Detection by Means of Vision Transformer and CoAtNet Architecture 5

Potato Leaf Disease Detection by Means of Vision Transformer...

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5th IEEE International Conference on Technology, Informatics, Management, engineering and Environment, TIME-E 2024

作者： Kenan Sergio, Mesa Anugerah Stevano Siallagan, Ariel Brandon Joelianto, Endra Institut Teknologi Bandung Engineering Physics Study Program Bandung Indonesia Institut Teknologi Bandung Instrumentation Control and Automation Research Group Bandung Indonesia

ISBN: (纸本)9798350364743

Potatoes are a food source that is beneficial for humans in various aspects, such as having nutritional and economic value. However, potato plants are susceptible to many diseases. To address this issue, various researchers have suggested methods utilizing machine learning and image processing for automatic disease type detection. This paper introduces a disease detection model for potato leaf images, employing two computer vision techniques: Vision Transformer (ViT) and CoAtNet. The dataset used in this paper consisted of 30,760 augmented images divided into seven classes. The ViT model had a test accuracy of 99.32% and a validation accuracy of99.12%. Meanwhile, the CoAtNEt model had a test accuracy of 99.58 % and a validation accuracy of 99.48 %. These results show that both models can be used in the detection of potato leaf diseases. © 2024 IEEE.

关键词： CoAtNet image processing leaf disease potato vision transformer

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Ultrafast dynamics of chiral phonons in tungsten disulfide

Ultrafast dynamics of chiral phonons in tungsten disulfide

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Lin, Tong Chen, Xiaotong Xu, Rui Luo, Jiaming Zhu, Hanyu Department of Materials Science and Nano Engineering Rice University Houston United States Applied Physics Graduate Program Rice University Houston United States

Linearly and circularly polarized phonons in monolayer WS2 are directly excited by resonant infrared pulses. The dynamics of coherent and incoherent chiral phonons are measured by time-resolved Raman spectroscopy and ... 详细信息

ISBN: (纸本)9781957171395

关键词： Time-resolved spectroscopy

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Experiment and simulation to determine the optimum orientation of building-integrated photovoltaic on tropical building façades considering annual daylight performance and energy yield

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Energy and Built Environment 2024年第3期5卷 414-425页

作者： Rizki A.Mangkuto Dhian Nur Aziz T.Tresna Ikhwan M.Hermawan Justin Pradipta Nurul Jamala Beta Paramita Atthaillah Building Physics Research Group Faculty of Industrial TechnologyInstitut Teknologi BandungLabtek VIJl.Ganesha 10Bandung 40132Indonesia Engineering Physics Program Faculty of Industrial TechnologyInstitut Teknologi BandungLabtek VIJl.Ganesha 10Bandung 40132Indonesia Engineering Physics Research Group Faculty of Industrial TechnologyInstitut Teknologi BandungLabtek VIJl.Ganesha 10Bandung 40132Indonesia Department of Architecture Faculty of EngineeringHasanuddin UniversityJl.Poros Malino Km.6Gowa 92171Indonesia Architecture Study Program Faculty of Technology and Vocational EducationUniversitas Pendidikan IndonesiaJl.Dr.Setiabudhi 229Bandung 40152Indonesia Architecture Program Faculty of EngineeringUniversitas MalikussalehJl.Cot Teungku NieAceh Utara 24355Indonesia

Building-Integrated Photovoltaic(BIPV)on vertical façades is a potential PV application in today’s *** performance of BIPV on façades is significantly influenced by the façade *** tropical cities,the optimum façade orientation,in terms of maximum energy yield and daylight performance,cannot be simply determined,due to relatively symmetrical sun path throughout the *** study therefore aims to determine the optimum orientation for BIPV on tropical building faç*** achieve the objective,experiment,modelling,and computational simulation are conducted to evaluate the BIPV energy yield and to predict the indoor daylight performance in a scale-model building with a 105Wp monocrystalline silicon PV,facing each cardinal orienta-tion in Bandung,*** South orientation yields practically zero ASE_(1000,250),providing the best annual daylight performance,and yielding the most desirable value in four out of five daylight *** greatest annual energy yield is at the North orientation,providing 179-186 kWh(95%prediction interval)per year,but with larger uncertainty compared to that at the South,due to direct sunlight *** on three different objective functions,the South orientation is considered optimum for placing the BIPV panel on the prototype façade in the location.

关键词： Building-integrated photovoltaic Orientation Daylight metric Energy yield Tropical building façade

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Design and Implementation of Four Cables Suspended Cable-driven Parallel Robot for Pendulum Batik Machine

Design and Implementation of Four Cables Suspended Cable-dri...

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2023 International Conference on Advanced Mechatronics, Intelligent Manufacture and Industrial Automation, ICAMIMIA 2023

作者： Juwandana, Alfisena Ekawati, Estiyanti Budi, Eko Mursito Radityo Putri, Indah Kudiya, Komarudin Institut Teknologi Bandung Instrumentation and Control Graduate Program Bandung Indonesia Institut Teknologi Bandung Engineering Physics Research Group Departement of Engineering Physics Bandung Indonesia Rumah Batik Komar Bandung Indonesia

ISBN: (纸本)9798350309225

This study researches the fusion of Indonesian traditional batik art with modernity called the Batik Pendulum. A machine based on Cable-Driven Parallel Robot (CDPR) architecture has been developed to automate the process of Batik Pendulum drawing. The suspended CDPR design uses four cables to provide flexibility and space efficiency. An artist may draw rough pendulum patterns utilizing a tablet as a human interface, which are then coded into coordinate-based code and sent to a microcontroller. The microcontroller drives four stepper motors to synchronize the length of the cables. Therefore, the platform carrying the wax can be moved to create the desired batik patterns. The machine was tested by dripping the paint on the fabric along the test path to validate the accuracy of the patterns. The Mean Absolute Percentage Error test results for the x, y, and radius axes were 1.63%, 1.95%, and 6.33%, while the maximum error values in the movement of the x, y, and radius axes were 8.64, 18.3, and 24.08 mm. This research represents a significant step in preserving Indonesia's cultural heritage while embracing contemporary creativity. © 2023 IEEE.

关键词： Microcontrollers

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