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2020 International Conference on Physics, Mechanics and Mathematical science, PMMS 2020

作者： Abdelhamid, Talaat Chen, Rongliang Alam, Mahbub Shenzhen Institutes of Advanced Technology Chinese Academy of Science Shenzhen China Institute for Turbulence-Noise-Vibration Interaction and Control Shenzhen Graduate School Harbin Institute of Technology Shenzhen China Physics and Mathematical Engineering Department Faculty of Electronic Engineering Menoufiya University Menouf Egypt Shenzhen Key Laboratory for Exascale Engineering and Scientific Computing Shenzhen China

This paper studies the prediction of the spatial-dependent-heat transfer coefficient γ(x) and- heat flux q(x), using the modified conjugate gradient method (MCGM). The mathematical formulation of the problem well defined and the existence of the minimizer is investigated. We establish the sensitivity and adjoint equations for computing the gradient with respect to γ(x) and q(x). The proposed algorithm 4.1 is derived for reconstructing γ(x) and q(x) using the MCGM. The numerical experiments are examined to show the efficiency and accuracy of the proposed method. Finally, some conclusions and remarks are given. © Published under licence by IOP Publishing Ltd.

关键词： Conjugate gradient method

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Status of the operations of CALET for 7.5 years on the International Space Station 38

Status of the operations of CALET for 7.5 years on the Inter...

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38th International Cosmic Ray Conference, ICRC 2023

作者： Tamura, T. Akaike, Y. Kobayashi, K. Adriani, O. Asano, K. Asaoka, Y. Berti, E. Bigongiari, G. Binns, W.R. Bongi, M. Brogi, P. Bruno, A. Cannady, N. Castellini, G. Checchia, C. Cherry, M.L. Collazuol, G. de Nolfo, G.A. Ebisawa, K. Ficklin, A.W. Fuke, H. Gonzi, S. Guzik, T.G. Hams, T. Hibino, K. Ichimura, M. Ioka, K. Ishizaki, W. Israel, M.H. Kasahara, K. Kataoka, J. Kataoka, R. Katayose, Y. Kato, C. Kawanaka, N. Kawakubo, Y. Kohri, K. Krawczynski, H.S. Krizmanic, J.F. Maestro, P. Marrocchesi, P.S. Messineo, A.M. Mitchell, J.W. Miyake, S. Moiseev, A.A. Mori, M. Mori, N. Motz, H.M. Munakata, K. Nakahira, S. Nishimura, J. Okuno, S. Ormes, J.F. Ozawa, S. Pacini, L. Papini, P. Rauch, B.F. Ricciarini, S.B. Sakai, K. Sakamoto, T. Sasaki, M. Shimizu, Y. Shiomi, A. Spillantini, P. Stolzi, F. Sugita, S. Sulaj, A. Takita, M. Tamura, T. Terasawa, T. Torii, S. Tsunesada, Y. Uchihori, Y. Vannuccini, E. Wefel, J.P. Yamaoka, K. Yanagita, S. Yoshida, A. Yoshida, K. Zober, W.V. Kanagawa University Faculty of Engineering Department of Applied Physics 3-27-1 Rokkakubashi Kanagawa-ku Yokohama Japan Department of Physics University of Florence Via Sansone 1 Sesto Fiorentino50019 Italy INFN Sezione di Firenze Via Sansone 1 Sesto Fiorentino50019 Italy Waseda Research Institute for Science and Engineering Waseda University 17 Kikuicho Shinjuku Tokyo162-0044 Japan JEM Utilization Center Human Spaceflight Technology Directorate Japan Aerospace Exploration Agency 2-1-1 Sengen Ibaraki Tsukuba305-8505 Japan Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa Chiba277-8582 Japan Via Madonna del Piano 10 Sesto Fiorentino50019 Italy Department of Physical Sciences Earth and Environment University of Siena via Roma 56 Siena53100 Italy INFN Sezione di Pisa Polo Fibonacci Largo B. Pontecorvo 3 Pisa56127 Italy Department of Physics McDonnell Center for the Space Sciences Washington University One Brookings Drive St. LouisMO63130-4899 United States Heliospheric Physics Laboratory NASA GSFC GreenbeltMD20771 United States Center for Space Sciences and Technology University of Maryland Baltimore County 1000 Hilltop Circle BaltimoreMD21250 United States Astroparticle Physics Laboratory NASA GSFC GreenbeltMD20771 United States Center for Research and Exploration in Space Sciences and Technology NASA GSFC GreenbeltMD20771 United States Department of Physics and Astronomy Louisiana State University 202 Nicholson Hall Baton RougeLA70803 United States Department of Physics and Astronomy University of Padova Via Marzolo 8 Padova35131 Italy INFN Sezione di Padova Via Marzolo 8 Padova35131 Italy Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo Kanagawa Sagamihara252-5210 Japan Kanagawa University 3-27-1 Rokkakubashi Kanagawa Kanagawa Yokohama221-8686 Japan Faculty of Science and Technology Graduate School of Science a

The CALorimetric Electron Telescope (CALET) has successfully been carrying out cosmic-ray observations on the International Space Station since October, 2015. CALET directly measures the cosmic-ray electron spectrum in the energy range of 1 GeV to 20 TeV with a 2 % energy resolution above 30 GeV. In addition, the instrument can measure the spectrum of gamma rays well into the TeV range, and the spectra of protons and nuclei up to a PeV. The scientific operations are implemented by taking into account orbital variations of geomagnetic rigidity cutoff. Scheduled command sequences are used to control the CALET observation modes on orbit. The high-energy (>10 GeV) trigger mode is always active for maintaining maximum exposure to high-energy electrons and other high-energy shower events. Also, around the ISS orbit, calibration data acquisition by, for example, recording pedestal and penetrating particle events, a low-energy electron trigger mode operating at high geomagnetic latitude, a low-energy gamma-ray trigger mode operating at low geomagnetic latitude, and an ultra-heavy trigger mode, are scheduled. As of June 30, 2023, the total observation time is 2818 days with a live time fraction of the total time around 86 %. Nearly 1.86 billion events are collected with the high-energy trigger. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmology

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Improving the Performance of 2d Perovskite Solar Cells by Carrier Trappings and Minifying the Grain Boundaries

SSRN

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SSRN 2022年

作者： Kim, Eun-Bi Akhtar, M. Shaheer Ameen, Sadia Umar, Ahmad Qasem, Hussam Shkir, Mohd Kaushik, Ajeet Mishra, Yogendra Kumar School of Chemical Engineering Jeonbuk National University Jeonbuk 54896 Korea Republic of Jeonbuk National University Jeonbuk Korea Republic of Advanced Materials and Devices Laboratory Department of Bio-Convergence Science Advanced Science Campus Jeonbuk National University 56212 Korea Republic of Department of Chemistry College of Science and Arts Najran University Najran11001 Saudi Arabia Najran University Najran11001 Saudi Arabia Riyadh11442 Saudi Arabia Department of Physics Faculty of Science King Khalid University Abha Saudi Arabia School of Science and Technology Glocal University Uttar Pradesh Saharanpur247001 India NanoBioTech Laboratory Health Systems Engineering Department of Environmental Engineering Florida Polytechnic University LakelandFL United States Mads Clausen Institute NanoSYD University of Southern Denmark Alsion 2 Sønderborg DK-6400 Denmark

Fabrication of 2D perovskite layers on 3D perovskite light absorbers, as the perovskite solar cells (PSCs), is being exploited to achieve high power-conversion efficiency (PCE) along with promising long-term stability. However, to improve the performance of PSCs, an intermediate layer of smart material is required which can fasciliate the desired interaction between two perovskite layers. The present work explores the role of 4-methoxyphenethylammonium (MPA+) cations as interfacing layer in 2D halide perovskite material towards developing an efficient PSCs. The effect of different ammonium salts (NH4Cl and NH4SCN) as additives in mixed halide MPA0.2MA0.8PbI3 is examined and the optoelectronic and photovoltaic responses of the developed PSCs are investigated in detail. Mixed halide MPA0.2MA0.8PbI3 thin film processed with NH4SCN additive showed an improved morphological and crystalline properties of fabricated PSCs as well as reduced non-radiative charge-carrier recombination rate. The NH4SCN/MPA0.2MA0.8PbI3 thin film based PSC demonstrated the highest PCE of ~15.1%, which is nearly 10% higher as compared to that of control PSC sample (~13.7 %) and NH4Cl/MPA0.2MA0.8PbI3 thin film PSC (7.53%). The NH4SCN/MPA0.2MA0.8PbI3 based PSC with highest efficiency, additionally showed a significantly improved device stability. It retained an efficieniecy value of ~95% of its initial even after exposure to ambient condition for over 100 hours. The presented NH4SCN/MPA0.2MA0.8PbI3 thin film based perovskite solar cell with high efficiency and high stability could open new avenues for improving the performance of solar cells and increase their contribution towards generation of renewable energy in future. © 2022, The Authors. All rights reserved.

关键词： Perovskite solar cells

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Influence of environmental dust accumulation on the performance and economics of solar energy systems: A comprehensive review

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Cleaner Energy systems 2024年 8卷

作者： Al-Sharafi, Abdullah Ahmadullah, Ahmad Bilal Hassan, Ghassan Al-Qahtani, Hussain Abubakar, Abba Abdulhamid Yilbas, Bekir Sami Mechanical Engineering Department King Fahd University of Petroleum & Minerals (KFUPM) Dhahran 31261 Saudi Arabia Interdisciplinary Research Center for Sustainable Energy Systems (IRC-SES) Research Institute King Fahd University of Petroleum & Minerals (KFUPM) Dhahran 31261 Saudi Arabia Researcher at K.A.CARE Energy Research & Innovation Center at Dhahran 31261 Saudi Arabia Department of Energy Engineering Engineering Faculty Kandahar University Kandahar 3801 Afghanistan Interdisciplinary Research Center for Advanced Materials (IRC-AM) Research Institute King Fahd University of Petroleum & Minerals (KFUPM) Dhahran 31261 Saudi Arabia Turkish Japanese University of Science and Technology Istanbul Turkey

The growing energy demand in contemporary societies, coupled with the environmental detriments of conventional energy sources, necessitates a shift towards sustainable alternatives such as solar energy. However, the efficiency of solar energy systems is contingent upon various factors including surface orientation, tilt angle, geographic location, climatic conditions, solar irradiation, humidity, and temperature. Nevertheless, dust deposition on the active surfaces of solar energy systems remains the primary factor that highly impacts the system's energy yield, profitability, and efficiency. This paper provides a comprehensive review of the impact of environmental dust accumulation on the performance of solar energy systems that comprise photovoltaic, flat plate collectors, concentrating solar collectors, or solar chimneys. The objectives of this paper extend to consider economic consequences and the cleaning cost due to dust accumulation on the active surfaces of solar energy systems. The annual revenue loss due to dust accumulation was estimated at up to 35 % for 20 % of solar radiation reduction due to dust accumulation and the cleaning costs ranged from 0.016 to 0.9 $/m² worldwide, depending on system type, location, and cleaning technique. The present study offers distinctive perspectives on the topic and provide valuable information to policymakers, researchers, end-users, and stakeholders in the solar energy industry. © 2024

关键词： Dust accumulation Dust characteristics Dust impacts Economic impacts Performance Solar energy

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Benthic bioturbations weaken the stability of blue carbon storage

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National science Open 2025年第2期4卷 205-218页

作者： Yingrong Huang Peng Zhang He-Bo Peng Feng Pan Yan Liu Kai Wang Yu Cai Jianyu Wang Zhenyan Wang Chunmiao Zheng Hailong Li Ding He Junjian Wang Chenyuan Dang Pengbao Wu Ji Chen Damien Maher Kai Xiao School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou 510006China Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems Fujian Key Laboratory of Coastal Pollution Prevention and ControlCollege of the Environment&EcologyXiamen UniversityXiamen 361102China Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen 318055China Center for Turbulence Research Stanford UniversityStanfordCA 94305USA Eastern Institute for Advanced Study Eastern Institute of TechnologyNingbo 315200China Department of Ocean Science and Center for Ocean Research in Hong Kong and MacaoThe Hong Kong University of Science and TechnologyHong Kong 999077China Hubei Key Laboratory of Multi-Media Pollution Cooperative Control in Yangtze Basin School of Environmental Science&EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Geography and Tourism Huizhou UniversityHuizhou 516007China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China Faculty of Science and Engineering Southern Cross UniversityLismoreNew South Wales 2480Australia CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China

Coastal ecosystems are known for their ability to sequester organic carbon(OC),termed“blue carbon”.The molecular composition of dissolved organic matter(DOM)can affect sediment OC content;however,the impact of benthic bioturbation on DOM properties and OC storage stability is not well *** study examined the effects of bio-turbation by fiddler crabs on DOM molecular properties and OC storage stability along the Chinese *** findings indicate that crab bioturbation enhanced the release of labile molecules by 59%on *** increase is controlled by the coupling reactions of iron and manganese minerals,and is influenced by climatic ***,fiddler crab bioturbation diminishes the durability of blue carbon storage,with the most significant effects observed in mangrove forests,followed by bare mudflats,tidal creek banks,and *** results underscore the critical role of benthic bioturbation in global blue carbon budgets.

关键词： blue carbon crab bioturbation Fe and Mn minerals climate change molecular level continental scale

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Novel symmetric numerical methods for solving symmetric mathematical problems

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International Journal of Circuits, systems and Signal Processing 2021年 15卷 1545-1557页

作者： Ibrahimov, V.R. Mehdiyeva, G.Y.U. Yue, Xiao-Guang Kaabar, Mohammed K.A. Noeiaghdam, Samad Juraev, Davron Aslonqulovich Institute of Control Systems named after Academician A.Huseynov BakuAZ1141 Azerbaijan Computational mathematics Baku State University BakuAZ1148 Azerbaijan Department of Computer Science and Engineering School of Sciences European University Cyprus Nicosia1516 Cyprus Institute of Mathematical Sciences Faculty of Science University of Malaya Kuala Lumpur50603 Malaysia Department of Mathematics and Statistics Washington State University PullmanWA99163 United States Industrial Mathematics Laboratory Baikal School of BRICS Irkutsk National Research Technical University Irkutsk664074 Russia Department of Applied Mathematics and Programming South Ural State University Lenin Prospect 76 Chelyabinsk454080 Russia Department of Natural Science Disciplines Higher Military Aviation School of the Republic of Uzbekistan Karshi City180100 Uzbekistan

—The mathematical model for many problems is arising in different industries of natural science, basically formulated using differential, integral and integro-differential equations. The investigation of these equations is conducted with the help of numerical integration theory. It is commonly known that a class of problems can be solved by applying numerical integration. The construction of the quadrature formula has a direct relation with the computation of definite integrals. The theory of definite integrals is used in geometry, physics, mechanics and in other related subjects of science. In this work, the existence and uniqueness of the solution of above-mentioned equations are investigated. By this way, the domain has been defined in which the solution of these problems is equivalent. All proposed four problems can be solved using one and the same methods. We define some domains in which the solution of one of these problems is also the solution of the other problems. Some stable methods with the degree p © 2021, North Atlantic University Union NAUN. All rights reserved.

关键词： Integrodifferential equations

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Adaptive control for flow and volume regulation in multi-producer district heating systems

arXiv

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arXiv 2021年

作者： Martinez, Juan Eduardo Machado Cucuzzella, Michele Pronk, Nina Scherpen, Jacquelien M.A. The Jan C. Willems Center for Systems and Control ENTEG Faculty of Science and Engineering University of Groningen Nijenborgh 4 Groningen9747 AG Netherlands The Department of Electrical Computer and Biomedical Engineering University of Pavia via Ferrata 5 Pavia27100 Italy

Flow and storage volume regulation is essential for the adequate transport and management of energy resources in district heating systems. In this letter, we propose a novel and suitably tailored-decentralized-adaptive control scheme addressing this problem whilst offering closed-loop stability guarantees. We focus on a system configuration comprising multiple heat producers, consumers and storage tanks exchanging energy through a common distribution network, which are features of modern and prospective district heating installations. The proposed controller is based on passivity, backstepping and (indirect) adaptive control theory. Copyright © 2021, The Authors. All rights reserved.

关键词： District heating

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Analysis of Factors Affecting Continuance Intention of E-Learning Adoption in Lecturers' Perspectives

Analysis of Factors Affecting Continuance Intention of E-Lea...

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Indonesia Malaysia Research Consortium Seminar 2018, IMRCS 2018

作者： Muqtadiroh, Feby Artwodini Herdiyanti, Anisah Wicaksono, Indra Usagawa, Tsuyoshi Department of Information Systems - ITS Indonesia Graduate School of Science and Technology Faculty of Engineering Faculty of Advanced Science and Technologoy Kumamoto University Japan

E-learning is an internet-based learning program. It has been adopted in Institut Teknologi Sepuluh Nopember (ITS) since 2006, and called SAHRE-ITS. It is managed by Directorate of Academic Affairs in ITS. Despite quite long adoption in ITS, there are still a number of problems to confront. One of them is lack of intent of the lecturers as the main and vital users to adopt e-learning continuously. The research was to identify factors affecting the continuance intention of lecturers to adopt SHARE-ITS using some model: expectation - confirmation model (ECM), technology acceptance model (TAM), theory of planned behaviour (TPB), and FLOW theory. The variables used comprised 10 variables, i.e.: perceived usefulness, perceived ease of use, attitude, perceived enjoyment, concentration, subjective norm, perceived behavioural control, confirmation, satisfaction, and continuance intention. The results of the research indicate some factors affecting the continuance intention of the lecturers to use SHARE-ITS and suggest some recommendations for strengthening those factors. This research showed the factors of lecture's satisfaction and perceived usefulness to SHAREITS positively and significantly affected the continuance intention to use SHARE-ITS. The factor of perceived ease of use among the lecturers positively and significantly affected the perceived usefulness among the lecturer towards SHARE-ITS. Those three factors were essential to consider as they affected the continued intention the lecturers to use SHARE-ITS. In addition, it is identified that the factor of perceived enjoyment in using SHARE-ITS by the lecturers positively and significantly affected their attitude in using SHARE-ITS. Accordingly, the researchers addressed recommendation within the contexts of service rendered by the administrator of SHARE-ITS, data integration, SHARE-ITS menu and navigation designs. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： E-learning

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Accurate Identification and Localization of Transmission Lines Under Complex Lighting for Distribution Network Power Supply Operation Robots

Accurate Identification and Localization of Transmission Lin...

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Chinese Automation Congress (CAC)

作者： Tianhe Liu Xin Chen Chenyu Hu Xu Jian Shengzu Li Gang Wang School of Automation China University of Geosciences Wuhan China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan China Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education Wuhan China Equipment Technology Center State Grid Hubei Electric Power Co. Ltd. Electric Power Science Research Institute Wuhan China Distribution Department State Grid Hubei Electric Power Co. Ltd. Wuhan Power Supply Company China

ISBN: (数字)9798350368604

ISBN: (纸本)9798350368611

Accurate identification and position of transmission lines is critical for robots to safely and effectively perform distribution network operations. However, such tasks are often challenged by complex lighting conditions, where depth information can be easily lost. Transmission lines have limited texture features and reflective surfaces, making it difficult to match image feature points. To address these challenges, this paper proposes a visual perception system for weak texture targets under complex lighting, based on an “eye-on-hand” configuration and a depth complementation algorithm. Furthermore, a high-precision identification and localization method for transmission line grasping points is developed, utilizing the fusion of binocular visual color maps and depth maps. The proposed method has been shown to effectively solve the problem of identifying and localizing the grasping points of transmission lines under complex lighting conditions. Experiments demonstrated that the method can improve the localization accuracy to within $\pm 4\text{mm}$ , outperforming other algorithms. The method is characterized as simple and efficient, and it enhances the environmental adaptability of distribution network robots.

关键词： Location awareness Visualization Power transmission lines Accuracy Image color analysis Lighting Distribution networks Grasping Wire Robots

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An exponential stability test for a messenger rna–micro rna ode model

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UPB Scientific Bulletin, Series A: Applied Mathematics and Physics 2020年第4期82卷 11-16页

作者： Olteanu, Mircea Ştefan, Radu Department of Mathematical Methods and Models Faculty of Applied Sciences University "Politehnica" of Bucharest Romania Department of Automatic Control and Systems Engineering Faculty of Automatic Control and Computer Science University "Politehnica" of Bucharest Romania

In this paper we obtain a numerically tractable test (sufficient condition) for the exponential stability of the unique positive equilibrium point of an ODE system. The result (Theorem 3.1) is based on Lyapunov theory and Linear Ma-trix Inequalities techniques. The ODE model is related to the messengerRNA-microRNA interaction. © 2020, Politechnica University of Bucharest. All rights reserved.

关键词： RNA

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