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

作者： Mishra, Mukul Vijayalakshmi, G. Reddy, B. Manjula, M. Rathi, Snehal R. Hemelatha, S. Chitkara University Institute of Engineering and Technology Chitkara University Centre for Interdisciplinary Research for Business and Technology Punjab India Prince Shri Venkateshwara Padmavathy Engineering College Department of Electronics and Communication Engineering Chennai127 India Chitkara University Chitkara Centre for Research and Development Himachal Pradesh 174103 India School of Sciences Department of Physics & Electronics Karnataka Bangalore India Vishwakarma Institute of Information Technology Department of Computer Engineering Pune India Karpagam Academy of Higher Education Department of Computer Science Engineering Coimbatore641021 India

ISBN: (纸本)9798350370249

This paper explores the layout and analysis of satellite constellation systems for worldwide insurance and capacity, with unique cognizance on geostationary orbit (GEO) structures as well as low Earth orbit (LEO) and medium Earth orbit (MEO) constellations. It starts off evolved by way of describing the technical necessities of such networks, which include the quantity of satellites inside the constellation, the orbital parameters, the system architecture and the communications era in vicinity, and examines the advantages and challenges associated with every solution. The paper then presents a top level view of the related value, trade-offs, and affects associated with numerous nominal layout parameters which includes latency decision, latency, structural complexity, payload capacity, and electricity. an in depth analysis of optimization techniques used to reduce the value and maximize the performance of the constellation is also supplied, with unique dialogue on the role of community topology and the type of orbit choice. Subsequently, the paper gives some practical insights related to the implementation and operation of a constellation system, similarly summarizing the predicted blessings in phrases of progressed insurance, ability, and latency for global packages. © 2024 IEEE.

关键词： Geostationary satellites

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Bose-Einstein Condensate Vortices with Hypercylindrical Symmetry using Zeroth-order Dimensional Perturbation Theory

arXiv

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arXiv 2024年

作者： Fite, Maria Isabelle McKinney, B.A. Department of Physics and Engineering Physics University of Tulsa TulsaOK74104 United States Tandy School of Computer Science University of Tulsa TulsaOK74104 United States

We investigate D-dimensional atomic Bose-Einstein condensates in a hypercylindrical trap with a vortex core along the z-axis and quantized circulation ℏm. We analytically approximate the hypercylindrical Gross-Pitaevskii equation using dimensional perturbation theory, where the perturbation parameter is δ = 1/(D + 2|m| - 3). We analyze lower effective dimensions due to trap anisotropy, and we compute properties of vortices in higher dimensions motivated by the study of synthetic dimensions, where additional dimensions can be simulated experimentally, and by holographic duality, where a higher-dimensional gravitational model corresponds to a lower-dimensional quantum model. We derive zeroth-order (δ → 0) semiclassical approximations for the condensate density, energy, chemical potential, and critical vortex rotation speed in arbitrary dimensions. In the zeroth-order approximation, we observe crossings between energy levels for different dimensions as a function of interaction strength and anisotropy parameters. Copyright © 2024, The Authors. All rights reserved.

关键词： Anisotropy

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Non-Hermitian chiral degeneracy of gated graphene metasurfaces

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Light(science & Applications) 2023年第5期12卷 766-775页

作者： Soojeong Baek Sang Hyun Park Donghak Oh Kanghee Lee Sangha Lee Hosub Lim Taewoo Ha Hyun Sung Park Shuang Zhang Lan Yang Bumki Min Teun-Teun Kim Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daehak-ro 291Daejeon 34141Republic of Korea Department of Electrical and Computer Engineering University of Minnesota200 Union street SEMinneapolisMN 55455USA Harvard Institute of Medicine Harvard Medical SchoolHarvard UniversityBrigham and Women's Hospital25 Shattuck StreetBostonMA 02215USA Center for Integrated Nanostructure Physics Institute for Basic Science(IBS)Sungkyunkwan UniversitySeobu-ro 2066Suwon 16419Republic of Korea Samsung Advanced Institute of Technology Samsung ElectronicsSamsung-roSuwon 16678Republic of Korea Department of Physics The University of Hong KongPokfulam RoadHong Kong Special Administrative RegionChina Department of Electrical and Systems Engineering Washington University1 Brookings DriveSaint LouisMO 63130USA Department of Physics Korea Advanced Institute of Science and Technology(KAIST)Daehak-ro 291Daejeon 34141Republic of Korea Department of Physics University of UlsanDaehakroUlsan 44610Republic of Korea Korea Research Institute of Standards and Science(KRISS) Gajeong-ro 267Daejeon 34113Republic of Korea

Non-Hermitian degeneracies,also known as exceptional points(EPs),have been the focus of much attention due to their singular eigenvalue surface ***,as pertaining to a non-Hermitian metasurface platform,the reduction of an eigenspace dimensionality at the EP has been investigated mostly in a passive repetitive ***,we propose an electrical and spectral way of resolving chiral EPs and clarifying the consequences of chiral mode collapsing of a non-Hermitian gated graphene *** specifically,the measured non-Hermitian Jones matrix in parameter space enables the quantification of nonorthogonality of polarisation eigenstates and half-integer topological charges associated with a chiral ***,the output polarisation state can be made orthogonal to the coalesced polarisation eigenstate of the metasurface,revealing the missing dimension at the chiral *** addition,the maximal nonorthogonality at the chiral EP leads to a blocking of one of the cross-polarised transmission pathways and,consequently,the observation of enhanced asymmetric polarisation *** anticipate that electrically controllable non-Hermitian metasurface platforms can serve as an interesting framework for the investigation of rich non-Hermitian polarisation dynamics around chiral EPs.

关键词： structure chiral integer

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Retraction Note: Nanostructure analysis in polymeric materials with ion beam based Raman spectroscopy for retinoblastoma tumor imaging using ensemble machine learning technique

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Optical and Quantum Electronics 2024年第10期56卷 1-2页

作者： Sur, Souvik Sudhakara Reddy, M. Paikaray, Divya Barve, Amit Faujdar, Manu Sharma, Sachin Awasthi, Aishwary Department of Chemistry Teerthanker Mahaveer University Moradabad India Department of Physics and Electronics School of Sciences Bangalore India Department of Computer Science and IT Arka Jain University Jamshedpur India Department of Computer Science and Engineering Parul University Vadodara India Department of Physics Vivekananda Global University Jaipur India School of Engineering and Computing Dev Bhoomi Uttarakhand University Dehradun India Department of Mechanical Engineering Sanskriti University Mathura India

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Terahertz Absorption & Raman Studies of Environmental Impact on Marble

Terahertz Absorption & Raman Studies of Environmental Impact...

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International Conference on Infrared and Millimeter Waves

作者： Puspita Chanda Naini Bajaj Aparajita Bandyopadhyay Amartya Sengupta Karl Bertling A.D. Rakic Dept of Physics Indian Institute of Technology Delhi New Delhi India School of Electrical Engineering and Computer Science The University of Queensland Brisbane Australia

ISBN: (数字)9798350370324

ISBN: (纸本)9798350370331

The rapid degradation of marble monuments and buildings in recent times due to acidification caused by anthropogenic impact on global environment poses significant concerns for heritage conservationists. The adverse effects of acid rain or the dry deposition of sulfur dioxide on marble cultural heritage structures greatly diminish their longevity and resilience. This study explores the efficacy of employing Terahertz Time Domain Spectroscopy (THz-TDS) in conjunction with Raman Spectroscopy and Energy Dispersive X-ray (EDX) methods to evaluate acid-induced damage in marble samples.

关键词： Degradation Spectroscopy Rain Raman scattering Sensors Sulfur Cultural differences Time-domain analysis Dispersion Resilience

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Shaping terahertz harmonic frequency combs with frequency dependent external reflectors

arXiv

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arXiv 2024年

作者： Silvestri, Carlo Qi, Xiaoqiong Taimre, Thomas Rakić, Aleksandar D. School of Physics University of Sydney SydneyNSW2006 Australia School of Electrical Engineering and Computer Science The University of Queensland BrisbaneQLD4072 Australia School of Mathematics and Physics The University of Queensland BrisbaneQLD4072 Australia

We present a method for engineering harmonic frequency combs (HFCs) in the terahertz spectral region. This approach involves interfacing a quantum cascade laser (QCL) with an external reflector featuring frequency-dependent reflectivity. A notable advantage of this method over existing ones is its dual functionality in shaping HFCs, allowing for control over both the frequency offset and comb spacing based on the external reflectivity profile. Moreover, the resulting HFCs manifest as sequences of short pulses in the time domain. Consequently, our method enables the generation of ultrashort picosecond pulses passively, providing a distinct alternative to conventional pulse generation systems reliant on active bias current modulation, which struggle with modulation frequencies significantly higher than the first beatnote. This offers intriguing prospects for utilizing HFCs in pump and probe spectroscopy, a field already recognized in the literature as one of the most compelling applications of these states. Furthermore, we demonstrate that these HFCs can be triggered from an initial condition of free-running unlocked dynamics, eliminating the need for assuming free-running comb emission. Thus, the utilization of an external, frequency-dependent reflector is capable of enhancing the coherence of the QCL emission. Copyright © 2024, The Authors. All rights reserved.

关键词： Quantum cascade lasers

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Retraction Note: Features fusion based novel approach for efficient blood vessel segmentation from fundus images

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Multimedia Tools and Applications 2024年第37期83卷 85497-85498页

作者： Singh, Law Kumar Khanna, Munish Mansukhani, Dheeraj Thawkar, Shankar Singh, Rekha Department of Computer Engineering and Applications GLA University Mathura India School of Computing Science and Engineering Galgotias University Greater Noida India Department of Computer Science and Engineering Hindustan College of Science and Technology Mathura India Department of Information Technology Hindustan College of Science and Technology Mathura India Department of Physics Uttar Pradesh Rajarshi Tandon Open University Prayagraj India

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Fluorinated Polymer Additives in Spiro-Ometad to Improve the Efficiency and Stability of Perovskite Solar Cells

SSRN

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SSRN 2023年

作者： Tabi, Grace Dansoa Nguyen, Dang-Thuan Liang, Wensheng Ji, Wenzhong Lu, Teng Tran-Phu, Thanh Lee Cheong Lem, Olivier Mayon, Azul Osorio Huang, Keqing Chang, Li-Chun Zhan, Hualin Ahmad, Viqar Mahmud, Md. Arafat Hou, Yihui Wang, Wei Bui, Anh Dinh Nguyen, Hieu T. Liu, Yun Shen, Heping Catchpole, Kylie R. Weber, Klaus J. White, Thomas P. Walter, Daniel Duong, The School of Engineering and Computer Science The Australian National University Canberra2601 Australia Research School of Chemistry College of Science The Australian National University Canberra2601 Australia Department of Electronic Materials Engineering Research School of Physics The Australian National University CanberraACT2600 Australia School of Physics The University of Sydney Sydney2006 Australia Engineering and Computer Science

This study demonstrates the transformative impact of incorporating poly(vinylidene fluoride-co-trifluoroethylene) P(VDF-TRFE) as an additive in the hole transport layer (HTL) of 2,2',7,7'-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene (Spiro-OMeTAD). The P(VDF-TRFE) additive forms resilient coordination bonds with 4-tert-butylpyridine (TBP) and lithium bis(trifluoromethanesulfonyl)imide additives, which mitigates TBP evaporation and improves Spiro-OMeTAD film quality. In addition, we observed improvements in solar cell current-voltage characteristics consistent with increased Spiro-OMeTAD conductivity and suppressed non-radiative recombination at the HTL/perovskite interface. P(VDF-TRFE)-integrated devices exhibit an increment in power conversion efficiency (PCE) up to 24.1% (reverse scan) from a reference PCE of 21.4%. Furthermore, the unencapsulated P(VDF-TRFE)-integrated devices demonstrate improved stability, retaining over 90% PCE after 45 days in an ambient atmosphere in the dark and 94% PCE after 1080 hours of continuous light-soaking in a nitrogen environment. This work demonstrates how additive engineering, as exemplified by P(VDF-TRFE), can effectively address stability and performance challenges within Spiro-OMeTAD in perovskite solar cells. © 2023, The Authors. All rights reserved.

关键词： Morphology

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High-Performance Digital Signal Processing Circuit Design and Analysis for Wireless Communication Systems 4

High-Performance Digital Signal Processing Circuit Design an...

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4th International Conference on Smart Electronics and Communication, ICOSEC 2023

作者： Kanika Shankar, R. Eswaramoorthi, R. Jeya Sheela, J. Joselin Suri, Ashish Vellachi, N. Srm Institute of Science and Technology Department of Computer Science and Engineering Uttar Pradesh Ghaziabad201204 India Kongunadu College of Engineering and Technology Department of Electrical and Electronic Engineering Thottiam621215 India Department of Electronics and Communication Engineering Tamil Nadu Namakal637215 India Saveetha School of Engineering Department of Electronics and Communication Engineering Tamil Nadu Chennai602105 India School of Electronics and Communication Engineering Shri Mata Vaishno Devi University Jammu and Kashmir Katra182320 India Department of Physics Tamil Nadu Dindigul624622 India

ISBN: (纸本)9798350300888

DSP circuits are used to perform various signal processing tasks, such as filtering, modulation, demodulation, and encoding. The demand for high-performance DSP circuits is increasing as wireless communication systems continue to evolve into a faster and more efficient signal processing. One of the challenges in designing high-performance DSP circuits is to balance the trade-offs between power consumption, performance, and area utilization. Here, this study proposes a novel algorithmic approach, which is a combination of Support Vector Machine (SVM) and Convolutional Neural Network (CNN). Novel algorithms can be used to improve the efficiency and speed of DSP circuits. These algorithms can be implemented by using various hardware architectures, such as Digital Signal Processors (DSPs), Application-Specific Integrated Circuits (ASICs), and Field Programmable Gate Arrays (FPGAs). Hardware implementation involves designing and optimizing the circuitry to implement the selected architecture. This involves optimizing the layout, routing, and placement of the components to minimize the area and power consumption. Performance evaluation involves testing and measuring a circuit's performance to ensure that it meets the design specifications. In conclusion, high-performance DSP circuit design and analysis for wireless communication systems using novel algorithms is essential for meeting the ever-increasing demand for faster and more efficient signal processing. The design process involves several stages, including algorithm design, architectural selection, hardware implementation, and performance evaluation, and requires a deep understanding of both DSP theory and hardware design. © 2023 IEEE.

关键词： Digital signal processing

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Value Chain in the Recycling of Photovoltaic Modules 9

Value Chain in the Recycling of Photovoltaic Modules

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9th International Conference on science, Technology, engineering and Mathematics, ICONSTEM 2024

作者： Bharathi, G.P. Yamunaa, P. Farook, S. Varshney, Niharika Poornashri, Mathangi R Kumar, M. Jogendra Sri Sai Ram Institute of Technology Department of Computer And Communication Engineering Tamil Nadu Chennai600044 India Peri Institute of Technology Department of Electrical And Electronics Engineering Tamil Nadu Chennai600048 India School of Engineering Mohan Babu University Department of Electrical And Electronics Engineering Andhra Pradesh Tirupathi517102 India Graphic Era Deemed To Be University Department of Electrical Engineering Uttarakhand Dehradun248002 India Department of Physics Tamil Nadu Dindigul624622 India KoneruLakshmaiah Education Foundation Department of Computer Science And Engineering Andhra Pradesh Vaddeswaram522302 India

ISBN: (纸本)9798350365092

The quantity of photovoltaic (PV) frameworks entering the waste stream will increment as the sun oriented photovoltaic business extends. The equivalent is anticipated for lithium-particle batteries utilized in electric vehicles, which can be allowed a subsequent opportunity in the wake of filling in as car power sources by going about as fixed energy capacity units for sustainable power sources like sunlight-based PV. This paper's principal objective is to audit 'cutting edge' research on the sun-oriented PV esteem chain (from item plan to item end-of-life), including its key stages, cycles, and partner connections, to pinpoint areas along the worth chain where roundabout methodologies could be applied, consequently propelling the PV business' change towards circularity exhaustively. This study investigates the suitability of recycling techniques for glasslike silicon (Si) PV modules from a monetary stance. Subsequently, this article takes on an incorporated worth chain point of view, frames a portion of the deterrents to circularity that industry members should survive, and puts forth the defense that these impediments will introduce potential open doors for both laid out players and new contenders to develop inside a roundabout PV industry. © 2024 IEEE.

关键词： Recycling

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