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SSRN 2022年

作者： Gyan, Emmanuel Erick Goa, Pal Amoako, George Inkoom, Stephen Antwi Nyarko, Linda Department of Pharmaceutical Sciences Faculty of Applied Sciences Sunyani Technical University Sunyani Ghana Department of Physics Norwegian University of Science and Technology Trondheim Norway Department of Physics School of Physical Sciences University of Cape Coast- Ghana Ghana Radiation Protection Institute Ghana Atomic Energy Commission. Legon- Accra Ghana Department of Pharmaceutical Sciences Faculty of Applied Sciences Sunyani Technical University Sunyani Ghana

IntroductionIn digital radiography, optimizing patient radiation dose has become necessary due to the potential of overexposure. The image contrast has no direct relationship to the exposure factors as in screen-film *** and methodsA female rando anthropomorphic phantom manufactured by Phantom Laboratory Salem, New York with model RAN100 was used for this study. The X-ray beam was focused at the inferior border of the scapula and collimated to the region of interest. Exposure factors were set from 70, 80, 90, 100, 110 and 120 kVp on 1.6 to 4 mAs. MATLAB program version R2018b (9, 5, 0, 944444) was used to develop the equation describing the relationship between inverse EI, mAs, kVp and the patient radiation *** mathematical equation describing the relationship between mAs, kVp and inverse EI for chest PA. was developed. . The result also shows an inverse relationship between exposure indicator and entrance skin *** relationship developed indicated that EI could be used as an effective and efficient tool for patient dose optimization. However, each radiographic facility should optimize its own EI values. IntroductionIn digital radiography, optimizing patient radiation dose has become necessary due to the potential of overexposure. The image contrast has no direct relationship to the exposure factors as in screen-film *** and methodsA female rando anthropomorphic phantom manufactured by Phantom Laboratory Salem, New York with model RAN100 was used for this study. The X-ray beam was focused at the inferior border of the scapula and collimated to the region of interest. Exposure factors were set from 70, 80, 90, 100, 110 and 120 kVp on 1.6 to 4 mAs. MATLAB program version R2018b (9, 5, 0, 944444) was used to develop the equation describing the relationship between inverse EI, mAs, kVp and the patient radiation *** mathematical equation describing the relationship between mAs, kVp and inverse EI for ches

关键词： Phantoms

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On b-acyclic chromatic number of a graph

arXiv

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arXiv 2022年

作者： Anholcer, Marcin Cichacz, Sylwia Peterin, Iztok Poznań University of Economics and Business Institute of Informatics and Quantitative Economy Al.Niepodleglości 10 Poznań61-875 Poland AGH University of Science and Technology Faculty of Applied Mathematics Al. Mickiewicza 30 Kraków30-059 Poland University of Maribor Faculty of Electrical Engineering and Computer Science Koroška 46 Maribor2000 Slovenia

Let G be a graph. We introduce the acyclic b-chromatic number of G as an analogue to the b-chromatic number of G. An acyclic coloring of a graph G is a map c: V (G) → {1,..., k} such that c(u) ≠ c(v) for any uv ∈ E(G) and the induced subgraph on vertices of any two colors i, j ∈ {1,..., k} induces a forest. On the set of all acyclic colorings of G we define a relation whose transitive closure is a strict partial order. The minimum cardinality of its minimal element is then the acyclic chromatic number A(G) of G and the maximum cardinality of its minimal element is the acyclic b-chromatic number Ab(G) of G. We present several properties of Ab(G). In particular, we derive Ab(G) for several known graph families, derive some bounds for Ab(G), compare Ab(G) with some other parameters and generalize some influential tools from b-colorings to acyclic *** Codes 05C15 © 2022, CC BY-NC-ND.

关键词： Coloring

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Chaos-chaos intermittency synchronization induced by feedback signals and stochastic noise in coupled chaotic systems

Chaos-chaos intermittency synchronization induced by feedbac...

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作者： Nobukawa, Sou Wagatsuma, Nobuhiko Nishimura, Haruhiko Department of Computer Science Chiba Institute of Technology Narashino-shi275-0016 Japan Faculty of Science Department of Information Science Toho University Funabashi-shi274-8510 Japan Graduate School of Applied Informatics University of Hyogo Kobe-shi650-0047 Japan

Various types of synchronization phenomena have been reported in coupled chaotic systems. In recent years, the applications of these phenomena have been advancing for utilization in sensor network systems, secure communication systems, and biomedical systems. Specifically, chaos-chaos intermittency (CCI) synchronization is a characterized synchronization phenomenon. Previously, we proposed a new chaos control method, termed as the "reduced region of orbit (RRO) method," to achieve CCI synchronization using external feedback signals. This method has been gathering research attention because of its ability to induce CCI synchronization;this can be achieved even if internal system parameters cannot be adjusted by external factors. Further, additive stochastic noise is known to have a similar effect. The objective of this study was to compare the performance of the RRO method and the method that applies stochastic noise, both of which are capable of inducing CCI synchronization. The results showed that even though CCI synchronization can be realized using both control methods under the induced attractor merging condition, the RRO method possesses higher adoptability and accomplishes a higher degree of CCI synchronization compared to additive stochastic noise. This advantage might facilitate the application of synchronization in coupled chaotic systems. © 2020 The Institute of Electronics, Information and Communication Engineers

关键词： Synchronization

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A new discord definition and an efficient time series discord detection method using GPUs 3

A new discord definition and an efficient time series discor...

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3rd International Conference on Software Engineering and Development, ICSED 2021

作者： Thi Thu Huynh, Thuy Tuan Duong, Anh Thi Ngoc Vo, Chau Faculty of Computer Science and Engineering Ho Chi Minh City Viet Nam University of Technology - VNU-HCM Ho Chi Minh City Viet Nam Center for Applied Information Technology Ton Duc Thang University Ho Chi Minh City Viet Nam Department of It Hcm City University of Foreign Languages and Information Technology Ho Chi Minh city Viet Nam

ISBN: (纸本)9781450385213

Discord is the most unusual subsequence in a time series. Most of the methods for discord detection in time series belong to the window-based category which uses a sliding window with a pre-specified length. Besides, a discord may appear twice or more times so that any instance of this discord does not qualify to be an abnormal. In addition, computational cost of window-based methods for discord detection is still high. In this paper, we propose a GPU-based parallel method, called KBF_GPU, for time series discord detection with a new definition of discord and no requirement for a pre-specified discord length. With the new discord definition, KBF_GPU can detect exactly the discord in case of there are more than one similar discords in time series. By using GPU programming techniques to parallelize Brute-Force algorithm with the new discord definition, our proposed KBF_GPU can run about 10,216 times faster than Brute-Force algorithm with the new discord definition on average over seven benchmark datasets. © 2021 ACM.

关键词： Graphics processing unit

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Growth and characterization of ultrathin cobalt ferrite films on Pt(111)

arXiv

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arXiv 2022年

作者： Soria, G.D. Freindl, K. Prieto, J.E. Quesada, A. De La Figuera, J. Spiridis, N. Korecki, J. Marco, J.F. Instituto de Química Física Rocasolano CSIC MadridE-28006 Spain Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences Kraków30-239 Poland Instituto de Cerámica y Vidrio CSIC MadridE-28049 Spain AGH University of Science and Technology Faculty of Physics and Applied Computer Science Kraków30-259 Poland

CoFe2O4thin films (5 nm and 20 nm thick) were grown by oxygen assisted molecular beam epitaxy on Pt(111) at 523 K and subsequently annealed at 773 K in vacuum or oxygen. They were characterized insitu using Auger Electron Spectroscopy, Low-Energy Electron Diffraction, Scanning Tunneling Microscopy and Conversion Electron Mössbauer Spectroscopy. The as-grown films were composed of small, nanometric grains. Annealing of the films produced an increase in the grain size and gave rise to magnetic order at room temperature, although with a fraction of the films remaining in the paramagnetic state. Annealing also induced cobalt segregation to the surface of the thicker films. The measured Mössbauer spectra at low temperature were indicative of cobalt ferrite, the both films showing very similar hyperfine patterns. Annealing in oxygen or vacuum affected the cationic distribution, which was closer to that expected for an inverse spinel in the case of annealing in an oxygen atmosphere. © 2022, CC BY-NC-ND.

关键词： Annealing

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Rbgei3 Based Inorganic Perovskite Solar Cell Using Green Synthesized Cucro2 as Htl: A Comprehensive Study

SSRN

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SSRN 2022年

作者： Sarkar, D.K. Mottakin, M. Hasan, A.K. Mahmud Selvanathan, V. Sobayel, Khan Khan, M.N.I. Rabbani, A.F.M. Masum Shahinuzzaman, Md Aminuzzaman, Mohammod Anuar, Farah H. Suemasu, Takashi Sopian, Kamaruzzaman Akhtaruzzaman, Md Bangladesh Council of Scientific and Industrial Research Bangladesh The National University of Malaysia Selangor Bangi43600 Malaysia Department of Applied Chemistry and Chemical E ngineering Rajshahi University Rajshahi6205 Bangladesh Department of Applied Chemistry and Chemical Engineering Bangabandhu Sheikh Mujibur Rahman Science and Technology University Gopalganj8100 Bangladesh Dhaka1205 Bangladesh Materials Science Division Atomic Energy Centre Bangladesh Atomic Energy Commission Dhaka1000 Bangladesh Bangladesh Bangabandhu Science and Technology Fellowship Trust Ministry of Science and Technology Bangladesh Perak Campus Jalan Universiti Bandar Barat Perak D. R. Kampar31900 Malaysia Department of Chemistry Faculty of Science Universiti Kebangsaan Malaysia @The National University of Malaysia Selangor Darul Ehsan Bangi43600 Malaysia Department of Applied Physics Faculty of Pure and Applied Sciences Tsukuba University Ibaraki Tsukuba305-8573 Japan

The delafossite, CuCrO 2 was prepared by the green synthesized method and characterized by XRD, FESEM-EDX, and UV-Visible Spectrophotometric techniques. According to the XRD pattern, the crystallites are polycrystalline phases, and a prominent peak has been observed at the indexed plan (012) with a corresponding 2θ angle of 36.4°. Bandgap (E g ) has been calculated by Tauc plot using UV-Vis data, and the calculated bandgap is 3.0 eV. These results are applied for simulation study in Pb-free RbGeI 3- based inorganic perovskite device using CuCrO 2 as hole transporting material (HTL). HTL thickness, diffusion length, interface defect, carrier concentration, activation energy, and temperature effects on the device performance have been explored by SCAPS-1D simulation software. In the optimized condition, the simulated result shows the device efficiency is 23.8 %, corresponding V oc , J sc and FF of 0.89 V, 33.7 mA cm −2, and 79.2 %, respectively. A study of activation energy for the device elucidates that the significant recombination is Shockley Read Hall (SRH) type at the (RbGeI 3 /CuCrO 2 ) interface layer. The result of temperature impact has supported better thermal stability. ITO is suitable front contact for the proposed p-i-n structure. The study reveals that the delafossite, CuCrO 2 can be a potential HTM for Pb-free inorganic perovskite solar cells. © 2022, The Authors. All rights reserved.

关键词： Perovskite

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Estimation of Thermodynamic Parameters for Better Conservation of Fresh Tomato (Lycopersicum esculentum)

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Advances in Chemical Engineering and science 2023年第2期13卷 149-171页

作者： Clément Ahouannou Codjo Goudjinou Sibiath G. Osséni Julien Adounkpe Waliou Amoussa Hounkpatin Basile Kounouhewa Laboratory of Energetic and Mechanic Applied (LEMA) High Polytechnic of Abomey-Calavi (EPAC) Abomey-Calavi University (UAC) Cotonou Republic of Benin Laboratory of Energetic and Mechanic Applied (LEMA) High Polytechnic of Abomey-Calavi (EPAC) Abomey-Calavi Univer-sity (UAC) Cotonou Republic of Benin Units of Research in Enzyme Engineering and Food (URGEA) Laboratory of Study and Applied Chemistry Research (LERCA) High Polytechnic of Abomey-Calavi Abomey-Calavi University Cotonou Republic of Benin Laboratory of Applied Ecology Faculty of Agronomic Sciences University of Abomey Calavi Cotonou Republic of Benin Laboratory of Human Nutrition and Food Sciences Faculty of Agronomic Sciences University of Abomey Calavi Cotonou Republic of Benin Laboratory of Radiation Physics Faculty of Science and Technology University of Abomey-Calavi (LPR/FAST/UAC Benin) Cotonou Republic of Benin

Knowledge of the state of water balance of agro-food products is an essential step in drying or storage operations for preservation. Our study made it possible to determine the thermodynamic parameters which influence the storage conditions of fresh tomatoes grown in the south of Benin;and to predict its hygroscopic behavior during post-harvest storage. The desorption isotherms obtained at 40℃, 50℃ and 60℃, by the static gravimetric method using saturated saline solutions, are compared with those of the theoretical models of Brunauer, Emmet and Teller (BET), SMITH, PELEG and Guggenheim-Anderson-Boer (GAB). An adjustment of the experimental points, on the theoretical models, was made thanks to the numerical method which exploits the fminsearch algorithm under the MATLAB software, version R2018a. The GAB model at 50℃ faithfully reproduces the experimental desorption curves for water activities from 5.5% to 82.3%. The net isosteric heat of sorption was determined using the Clausius-Clapeyron equation, it increases when the degree of dehydration of the product increases. The applied isokinetic theory and enthalpy-entropy compensation are consistent.

关键词： Tomato Isotherms Theoretical Trend Model Thermodynamic Properties Heat of Sorption

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Observation of a Strongly Isospin-Mixed Doublet in Si26 via β-Delayed Two-Proton Decay of P26

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Physical Review Letters 2022年第24期129卷 242502-242502页

作者： J. J. Liu (刘嘉健) X. X. Xu (徐新星) L. J. Sun (孙立杰) C. X. Yuan (袁岑溪) K. Kaneko (金子和也) Y. Sun (孙扬) P. F. Liang (梁鹏飞) H. Y. Wu (吴鸿毅) G. Z. Shi (石国柱) C. J. Lin (林承键) J. Lee (李晓菁) S. M. Wang (王思敏) C. Qi (亓冲) J. G. Li (李健国) H. H. Li (李红蕙) Latsamy Xayavong Z. H. Li (李智焕) P. J. Li (李朋杰) Y. Y. Yang (杨彦云) H. Jian (简豪) Y. F. Gao (高雨枫) R. Fan (范锐) S. X. Zha (查思贤) F. C. Dai (戴凡超) H. F. Zhu (朱浩钒) J. H. Li (李金海) Z. F. Chang (常志芳) S. L. Qin (覃淑炼) Z. Z. Zhang (张朝展) B. S. Cai (蔡博帅) R. F. Chen (陈若富) J. S. Wang (王建松) D. X. Wang (王东玺) K. Wang (王康) F. F. Duan (段芳芳) Y. H. Lam (蓝乙华) P. Ma (马朋) Z. H. Gao (高志浩) Q. Hu (胡强) Z. Bai (白真) J. B. Ma (马军兵) J. G. Wang (王建国) C. G. Wu (武晨光) D. W. Luo (罗迪雯) Y. Jiang (蒋颖) Y. Liu (刘洋) D. S. Hou (侯东升) R. Li (李忍) N. R. Ma (马南茹) W. H. Ma (马维虎) G. M. Yu (余功明) D. Patel S. Y. Jin (金树亚) Y. F. Wang (王煜峰) Y. C. Yu (余悦超) L. Y. Hu (胡力元) X. Wang (王翔) H. L. Zang (臧宏亮) K. L. Wang (王凯龙) B. Ding (丁兵) Q. Q. Zhao (赵青青) L. Yang (杨磊) P. W. Wen (温培威) F. Yang (杨峰) H. M. Jia (贾会明) G. L. Zhang (张高龙) M. Pan (潘敏) X. Y. Wang (汪小雨) H. H. Sun (孙浩瀚) H. S. Xu (徐瑚珊) X. H. Zhou (周小红) Y. H. Zhang (张玉虎) Z. G. Hu (胡正国) M. Wang (王猛) M. L. Liu (柳敏良) H. J. Ong (王惠仁) W. Q. Yang (杨维青) CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China Department of Physics The University of Hong Kong Hong Kong China Department of Nuclear Physics China Institute of Atomic Energy Beijing 102413 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516003 China School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China National Superconducting Cyclotron Laboratory Michigan State University East Lansing Michigan 48824 USA Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen University Zhuhai 519082 China Department of Physics Kyushu Sangyo University Fukuoka 813-8503 Japan State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China College of Physics and Technology & Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal University Guilin 541004 China Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) Institute of Modern Physics Fudan University Shanghai 200433 China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan University Shanghai 200438 China KTH Royal Institute of Technology SE-100 44 Stockholm Sweden Department of Physics Faculty of Natural Sciences National University of Laos Vientiane 01080 Laos College of Science Huzhou University Huzhou 313000 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin 150001 China Department of Physics Sardar Vallabhbhai National Institute of Technology Surat 395007 India School of Physics and Astronomy Yunnan University Kunming 6

β decay of proton-rich nuclei plays an important role in exploring isospin mixing. The β decay of P26 at the proton drip line is studied using double-sided silicon strip detectors operating in conjunction with high-purity germanium detectors. The T=2 isobaric analog state (IAS) at 13 055 keV and two new high-lying states at 13 380 and 11 912 keV in Si26 are unambiguously identified through β-delayed two-proton emission (β2p). Angular correlations of two protons emitted from Si26 excited states populated by P26 β decay are measured, which suggests that the two protons are emitted mainly sequentially. We report the first observation of a strongly isospin-mixed doublet that deexcites mainly via two-proton decay. The isospin mixing matrix element between the Si26 IAS and the nearby 13 380-keV state is determined to be 130(21) keV, and this result represents the strongest mixing, highest excitation energy, and largest level spacing of a doublet ever observed in β-decay experiments.

关键词： Beta decay Nuclear structure & decays Proton emission 20 ≤ A ≤ 38

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Spatial and Temporal Coherence in Strongly Coupled Plasmonic Bose-Einstein Condensates

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Physical Review Letters 2021年第25期127卷 255301-255301页

作者： Antti J. Moilanen Konstantinos S. Daskalakis Jani M. Taskinen Päivi Törmä Department of Applied Physics Aalto University School of Science P.O. Box 15100 Aalto FI-00076 Finland Department of Mechanical and Materials Engineering Turku University Faculty of Technology Turku FI-20014 Finland

We report first-order spatial and temporal correlations in strongly coupled plasmonic Bose-Einstein condensates. The condensate is large, more than 20 times the spatial coherence length of the polaritons in the uncondensed system and 100 times the healing length, making plasmonic lattices an attractive platform for studying long-range spatial correlations in two dimensions. We find that both spatial and temporal coherence display nonexponential decay; the results suggest power-law or stretched exponential behavior with different exponents for spatial and temporal correlation decays.

关键词： Bose gases Bose-Einstein condensates Exciton polariton Light-matter interaction Metamaterials Nanophotonics Photonics Plasmonics Plasmons Polaritons Quantum optics Surface plasmon polariton

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The Use of Statin-Class Compounds to Suppress Methanogenesis in Lake Sediment Inoculated Microbial Fuel Cells

SSRN

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SSRN 2022年

作者： Jayathilake, Chamindu Dilangani, Gayani P. Bandara, Sampath Nazeer, Zumaira Thilini, Nirath Bandara, Wijendra Herath, Ajith C. Kyazze, Godfrey Fernando, Eustace Y. Department of Biology Faculty of Applied Sciences Rajarata University Mihintale50300 Sri Lanka Faculty of Technology Rajarata University 50300 Sri Lanka Department of Physics Faculty of Science University of Peradeniya Sri Lanka Department of Chemistry Faculty of Applied Sciences Rajarata University 50300 Sri Lanka Faculty of Life Sciences University of Westminster 115 New Cavendish Street LondonW1W 6UW United Kingdom

Methanogenesis conducted by archaea acts as a competing metabolic pathway that diverts available carbon and electrons away from exo-electrogenic metabolism in mixed culture inoculated microbial fuel cells (MFCs). Statin-class compounds are known to selectively inhibit eukaryotic and archaeal versions of HMG Co-A reductase (class-I) enzyme. This study demonstrated that the two statin compounds Simvastatin and Atorvastatin were effective in suppressing methanogenesis in MFCs. Power densities increased 2 fold compared to control (to 63 ± 1.8 mW/m 2 ) and 2.5 fold (to 69.5 ± 1.8 mW/m 2 ) with Simvastatin and Atorvastatin addition respectively. There was an almost complete suppression of CH 4 production when statins were added. Quantitative FISH (qFISH) analysis showed that methanogens Methanosarcina, Metanobacteria and Methanomicrobiales together with all archaea were almost completely suppressed when statins were supplemented into MFC anodes. This study demonstrated that the statins addition can be used to boost power densities in MFCs. © 2022, The Authors. All rights reserved.

关键词： Microbial fuel cells

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