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Creating and controlling exceptional points of non-Hermitian Hamiltonians via homodyne Lindbladian invariance

Physical Review A 2022年第4期106卷 042210-042210页

作者： Fabrizio Minganti Dolf Huybrechts Cyril Elouard Franco Nori Ievgen I. Arkhipov Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) CH-1015 Lausanne Switzerland Center for Quantum Science and Engineering Ecole Polytechnique Fédérale de Lausanne (EPFL) CH-1015 Lausanne Switzerland Univ Lyon Ens de Lyon CNRS Laboratoire de Physique F-69342 Lyon France Inria ENS Lyon LIP F-69342 Lyon Cedex 07 France Theoretical Quantum Physics Laboratory RIKEN Cluster for Pioneering Research Wako-shi Saitama 351-0198 Japan RIKEN Center for Quantum Computing (RQC) Wako-shi Saitama 351-0198 Japan Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Joint Laboratory of Optics of Palacký University and Institute of Physics of CAS Faculty of Science Palacký University 17. listopadu 12 771 46 Olomouc Czech Republic

The exceptional points (EPs) of non-Hermitian Hamiltonians (NHHs) are spectral degeneracies associated with coalescing eigenvalues and eigenvectors, which are associated with remarkable dynamical properties. These EPs can be generated experimentally in open quantum systems, evolving under a Lindblad equation, by postselecting on trajectories that present no quantum jumps, such that the dynamics is ruled by a NHH. Interestingly, changing the way the information used for postselection is collected leads to different unravelings, i.e., different set of trajectories, which average to the same Lindblad equation, but are associated with a different NHH. Here, we exploit this mechanism to create and control EPs solely by changing the measurement we postselect on. Our scheme is based on a realistic homodyne reading of the emitted leaking photons with a weak-intensity laser (a process that we call β-dyne), which we show generates a tunable NHH, that can exhibit EPs even though the system does have any in the absence of the laser. We consider a few illustrative examples pointing out the dramatic effects that different postselections can have on the spectral features of the NHH, paving the road towards engineering of EPs in simple quantum systems.

关键词： Quantum measurements Stochastic differential equations

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Feature Location Benchmark for Decomposing and Reusing Android Apps

arXiv

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arXiv 2020年

作者： Tang, Yutian Zhou, Hao Xu, Zhou Luo, Xiapu Cai, Yan Zhang, Tao Department of Computing Hong Kong Polytechnic University Hong Kong School of Big Data and Software Engineering Chongqing University China State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences China Faculty of Information Technology Macau University of Science and Technology China

Software reuse enables developers to reuse architecture, programs and other software artifacts. Realizing a systematical reuse in software brings a large amount of benefits for stakeholders, including lower maintenance efforts, lower development costs, and time to market. Unfortunately, currently implementing a framework for large-scale software reuse in Android apps is still a huge problem, regarding the complexity of the task and lacking of practical technical support from either tools or domain experts. Therefore, proposing a feature location benchmark for apps will help developers either optimize their feature location techniques or reuse the assets created in the benchmark for reusing. In this paper, we release a feature location benchmark, which can be used for those developers, who intend to compose software product lines (SPL) and release reuse in apps. The benchmark not only contributes to the research community for reuse research, but also helps participants in industry for optimizing their architecture and enhancing modularity. In addition, we also develop an Android Studio plugin named caIDE for developers to view and operate on the benchmark. Copyright © 2020, The Authors. All rights reserved.

关键词： Computer software reusability

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Adsorptive removal of arsenic from drinking water using KOH-modified sewage sludge-derived biochar

Cleaner Water

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Cleaner Water 2024年 2卷

作者： Ahsan Shah Arun Arjunan Anusha Thumma Julia Zakharova Timothy Bolarinwa Shreah Devi Maryam Batool School of Engineering Computing and Mathematical Sciences University of Wolverhampton WV1 1LY UK Department of Pharmaceutical Sciences College of Pharmacy Nova Southeastern University Fort Lauderdale FL USA School of Architecture and Built Environment University of Wolverhampton WV1 1LY UK Faculty of Science and Engineering University of Wolverhampton WV1 1LY UK Department of Chemistry University of Sahiwal Sahiwal Pakistan

This paper reveals a green chemistry approach to remove arsenic (As +3 ) from water using potassium hydroxide (KOH) modified sewage sludge-derived biochar (SSDB-KOH). Characterisation of the morphology, particle size and composition of the SSDB-KOH pre- and post-adsorption confirmed porous and heterogenous surface favouring adsorption. At ambient temperature (20 °C), the SSDB-KOH dose of 20 g/l achieved 98 % arsenite removal at nearly neutral solution pH (8). This compared favourably with pristine SSDB, where the performance was limited to 41.6 % removal. The enhanced arsenite adsorption of SSDB-KOH was informed by several mechanisms, including ionic interactions, pore filling and metal-pi interactions. The experimental data fits closely with the Langmuir isotherm and pseudo-second-order kinetic models, revealing monolayer adsorption and the chemical interaction between adsorbents and the adsorbate. The spontaneous and endothermic nature of the process was confirmed by the negative value of ΔG and the positive value of ΔH, respectively. The performance of the biochar was evaluated for four-cycle regeneration. Finally, a cost analysis was performed to demonstrate the economic feasibility of using SSDB-KOH to remove arsenic from water.

关键词： Adsorption KOH-modified biochar Arsenic Batch study Regeneration Drinking water

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Understanding metric-related pitfalls in image analysis validation

arXiv

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arXiv 2023年

作者： Reinke, Annika Tizabi, Minu D. Baumgartner, Michael Eisenmann, Matthias Heckmann-Nötzel, Doreen Kavur, A. Emre Rädsch, Tim Sudre, Carole H. Acion, Laura Antonelli, Michela Arbel, Tal Bakas, Spyridon Benis, Arriel Blaschko, Matthew B. Buettner, Florian Cardoso, M. Jorge Cheplygina, Veronika Chen, Jianxu Christodoulou, Evangelia Cimini, Beth A. Collins, Gary S. Farahani, Keyvan Ferrer, Luciana Galdran, Adrian van Ginneken, Bram Glocker, Ben Godau, Patrick Haase, Robert Hashimoto, Daniel A. Hoffman, Michael M. Huisman, Merel Isensee, Fabian Jannin, Pierre Kahn, Charles E. Kainmueller, Dagmar Kainz, Bernhard Karargyris, Alexandros Karthikesalingam, Alan Kenngott, Hannes Kleesiek, Jens Kofler, Florian Kooi, Thijs Kopp-Schneider, Annette Kozubek, Michal Kreshuk, Anna Kurc, Tahsin Landman, Bennett A. Litjens, Geert Madani, Amin Maier-Hein, Klaus Martel, Anne L. Mattson, Peter Meijering, Erik Menze, Bjoern Moons, Karel G.M. Müller, Henning Nichyporuk, Brennan Nickel, Felix Petersen, Jens Rafelski, Susanne M. Rajpoot, Nasir Reyes, Mauricio Riegler, Michael A. Rieke, Nicola Saez-Rodriguez, Julio Sánchez, Clara I. Shetty, Shravya Summers, Ronald M. Taha, Abdel A. Tiulpin, Aleksei Tsaftaris, Sotirios A. van Calster, Ben Varoquaux, Gaël Yaniv, Ziv R. Jäger, Paul F. Maier-Hein, Lena Faculty of Mathematics and Computer Science Heidelberg University Heidelberg Germany Heidelberg Division of Intelligent Medical Systems Germany NCT Heidelberg A Partnership Between DKFZ University Medical Center Heidelberg Germany Heidelberg Division of Medical Image Computing Germany Heidelberg Division of Intelligent Medical Systems Germany MRC Unit for Lifelong Health and Ageing UCL Centre for Medical Image Computing Department of Computer Science University College London London United Kingdom School of Biomedical Engineering and Imaging Science King’s College London London United Kingdom Instituto de Cálculo CONICET – Universidad de Buenos Aires Buenos Aires Argentina Centre for Medical Image Computing University College London London United Kingdom McGill University Montreal Canada Division of Computational Pathology Dept of Pathology & Laboratory Medicine Indiana University School of Medicine IU Health Information and Translational Sciences Building Indianapolis United States University of Pennsylvania Richards Medical Research Laboratories FL7 PhiladelphiaPA United States Department of Digital Medical Technologies Holon Institute of Technology Holon Israel European Federation for Medical Informatics Le Mont-sur-Lausanne Switzerland Center for Processing Speech and Images Department of Electrical Engineering KU Leuven Leuven Belgium partner site Frankfurt/Mainz a partnership between DKFZ and UCT Frankfurt Marburg Germany Heidelberg Germany Goethe University Frankfurt Department of Medicine Germany Goethe University Frankfurt Department of Informatics Germany and Frankfurt Cancer Insititute Germany Department of Computer Science IT University of Copenhagen Copenhagen Denmark Leibniz-Institut für Analytische Wissenschaften – ISAS – e.V. Dortmund Germany Imaging Platform Broad Institute of MIT and Harvard CambridgeMA United States Centre for Statistics in Medicine University of Oxford Oxford United Kingdom Center for Biomedical In

Validation metrics are key for tracking scientific progress and bridging the current chasm between artificial intelligence (AI) research and its translation into practice. However, increasing evidence shows that particularly in image analysis, metrics are often chosen inadequately. While taking into account the individual strengths, weaknesses, and limitations of validation metrics is a critical prerequisite to making educated choices, the relevant knowledge is currently scattered and poorly accessible to individual researchers. Based on a multi-stage Delphi process conducted by a multidisciplinary expert consortium as well as extensive community feedback, the present work provides the first reliable and comprehensive common point of access to information on pitfalls related to validation metrics in image analysis. While focused on biomedical image analysis, the addressed pitfalls generalize across application domains and are categorized according to a newly created, domain-agnostic taxonomy. The work serves to enhance global comprehension of a key topic in image analysis validation. © 2023, CC BY.

关键词： Computer vision

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Anionic Ordering in Pb2Ti4O9F2 Revisited by Nuclear Magnetic Resonance and Density Functional Theory

arXiv

引用

arXiv 2021年

作者： Oka, Kengo Ichibha, Tom Kato, Daichi Noda, Yasuto Tominaga, Yusuke Yamada, Kosei Iwasaki, Mitsunobu Noma, Naoki Hongo, Kenta Maezono, Ryo Reboredo, Fernando A. Department of Applied Chemistry Faculty of Science and Engineering Kindai University Osaka Higashiosaka577-8502 Japan Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Energy and Hydrocarbon Chemistry Graduate School of Engineering Kyoto University Kyoto615-8510 Japan Division of Chemistry Graduate School of Science Kyoto University Kyoto606-8502 Japan Joint Research Center Kindai University Osaka Higashiosaka577-8502 Japan Research Center for Advanced Computing Infrastructure JAIST Asahidai 1-1 Ishikawa Nomi923-1292 Japan School of Information Science JAIST Asahidai 1-1 Ishikawa Nomi923-1292 Japan

A combination of 19F magic angle spinning (MAS) nuclear magnetic resonance (NMR) and density functional theory (DFT) were used to study the ordering of F atoms in Pb2Ti4O9F2. This analysis revealed that F atoms predominantly occupy two of the six available inequivalent sites in a ratio of 73:27. DFT-based calculations explained the preference of F occupation on these sites and quantitatively reproduced the experimental occupation ratio, independent of the choice of functional. We concluded that the Pb atom's 6s2 lone pair may play a role (∼0.1 eV/f.u.) in determining the majority and minority F occupation sites with partial density of states and crystal orbital Hamiltonian population analyses applied to the DFT wave functions. Copyright © 2021, The Authors. All rights reserved.

关键词： Density functional theory

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A λ3mm line survey towards the circumstellar envelope of the carbon-rich AGB star IRC+10216 (CW Leo)

arXiv

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arXiv 2024年

作者： Tuo, Juan Li, Xiaohu Sun, Jixian Millar, Tom J. Zhang, Yong Qiu, Jianjie Quan, Donghui Esimbek, Jarken Zhou, Jianjun Gao, Yu Chang, Qiang Xiao, Lin Feng, Yanan Miao, Zhenzhen Ma, Rong Szczerba, Ryszard Fang, Xuan Xinjiang Astronomical Observatory Chinese Academy of Sciences 150 Science 1-Street Urumqi Xinjiang830011 China University of Chinese Academy of Sciences Beijing100049 China Xinjiang Key Laboratory of Radio Astrophysics 150 Science1-Street Urumqi Xinjiang830011 China Purple Mountain Observatory Chinese Academy of Sciences Nanjing210034 China Key Laboratory of Radio Astronomy Chinese Academy of Sciences Nanjing210034 China Astrophysics Research Centre School of Mathematics and Physics Queen's University Belfast BelfastBT7 1NN United Kingdom School of Physics and Astronomy Sun Yat-sen University Guangzhou510275 China Laboratory for Space Research Faculty of Science The University of Hong Kong Hong Kong Hong Kong Astronomical Computing Research Center Zhejiang Laboratory Hangzhou311100 China Department of Astronomy Xiamen University Fujian Xiamen361005 China School of Physics and Optoelectronic Engineering Shandong University of Technology Zibo Shandong255000 China College of Science Changchun Institute of Technology Jilin Changchun130012 China Nicolaus Copernicus Astronomical Center Rabiańska 8 Toruń87-100 Poland National Astronomical Observatories Chinese Academy of Sciences A20 Datun Road Chaoyang District Beijing100012 China

We present an unbiased λ 3mm spectral line survey (between 84.5 and 115.8 GHz), conducted by the Purple Mountain Observatory 13.7 meter radio telescope, together with updated modeling results, towards the carbon-rich Asymptotic Giant Branch star, IRC+10216 (CW Leo). A total of 75 spectral lines (96 transitions) are detected, and identified to arise from 19 molecules: C2H, l-C3H, C4H, CN, C3N, HC3N, HC5N, HCN, HNC, CH3CN, MgNC, CO, c-C3H2, SiC2, SiO, SiS, CS, C2S, C3S, and their isotopologues. Among them, one molecular emission line (H13CCCN J = 13-12) is discovered in IRC+10216 for the first time. The excitation temperature, column density, and fractional abundance of the detected species are deduced by assuming they are in local thermodynamic equilibrium. In addition, the isotopic ratios of [12C]/[13C], [32S]/[34S], [28Si]/[29Si], and [12C34S]/[13C32S] are obtained and found to be consistent with previous studies. Finally, we summarize all of the 106 species detected in IRC+10216 to date with their observed and modeled column densities for the convenience of future studies. Copyright © 2024, The Authors. All rights reserved.

关键词： High frequency telecommunication lines

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Correction: Machine learning classification meets migraine: recommendations for study evaluation

引用

The journal of headache and pain 2024年第1期25卷 223页

作者： Igor Petrušić Andrej Savić Katarina Mitrović Nebojša Bačanin Gabriele Sebastianelli Daniele Secci Gianluca Coppola Laboratory for Advanced Analysis of Neuroimages Faculty of Physical Chemistry University of Belgrade Belgrade Serbia. ip7med@***. Science and Research Centre School of Electrical Engineering University of Belgrade University of Belgrade Belgrade Serbia. Department of Information Technologies Faculty of Technical Sciences Čačak University of Kragujevac Čačak Serbia. Department of Informatics and Computing Singidunum University Belgrade Serbia. Department of Medico-Surgical Sciences and Biotechnologies Sapienza University of Rome Polo Pontino ICOT Latina Italy. Department of Engineering and Architecture University of Parma Parma Italy.

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Corrigendum to "Novel dynamic fuzzy Decision-Making framework for COVID-19 vaccine dose recipients" [J. Adv. Res. 37 (2022) 147-168]

引用

Journal of advanced research 2023年 45卷 193页

作者： O S Albahri A A Zaidan A S Albahri H A Alsattar Rawia Mohammed Uwe Aickelin Gang Kou F M Jumaah Mahmood M Salih A H Alamoodi B B Zaidan Mamoun Alazab Alhamzah Alnoor Jameel R Al-Obaidie Computer Techniques Engineering Department Mazaya University College Thi-Qar Nassiriya Iraq. Faculty of Engineering & IT British University in Dubai United Arab Emirates. Electronic address: aws.alaa@fskik.upsi.edu.my. Iraqi Commission for Computers and Informatics (ICCI) Baghdad Iraq. Faculty of Engineering & IT British University in Dubai United Arab Emirates. School of Computing and Information Systems University of Melbourne 700 Swanston Street Victoria 3010 Australia. School of Business Administration Faculty of Business Administration Southwestern University of Finance and Economics Chengdu 611130 China. Department of Advanced Applications and Embedded Systems Intel Corporation Plot 6 Bayan Lepas Technoplex 11900 Georgetown Pulau Pinang Malaysia. Department of Computer Science Computer Science and Mathematics College Tikrit University Tikrit Iraq. Department of Computing Faculty of Arts Computing and Creative Industry Universiti Pendidikan Sultan Idris (UPSI) Perak Malaysia. Future Technology Research Center National Yunlin University of Science and Technology 123 University Road Section 3 Douliou Yunlin 64002 Taiwan ROC. College of Engineering IT and Environment Charles Darwin University NT Australia. School of Management Universiti Sains Malaysia Pulau Pinang Malaysia. Department of Biology Faculty of Science and Mathematics Universiti Pendidikan Sultan Idris Tanjong Malim Perak 35900 Malaysia.

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Optimization and fabrication of pure poly lactic acid (PLA) using hot press compression moulding

引用

IOP Conference Series: Materials science and engineering 2021年第1期1136卷

作者： M J Kamran E Jayamani K H Soon Y C Wong Department of Mechanical Engineering Faculty of Engineering Computing and Science Swinburne University of Technology 93350 Kuching Sarawak Malaysia Department of Mechanical Engineering and Product Design Engineering Swinburne University of Technology 3122 Hawthorn Melbourne Australia

Biodegradable poly lactic acid (PLA) samples were optimized and fabricated for flexural, tensile, hardness, and dielectric testing, according to the American Society for Testing Materials (ASTM). In order to achieve the highest value of tensile strength, flexural strength, and hardness, hot pressing compression molding was utilized to optimize PLA. Furthermore, not enough research was available regarding the preparation of PLA samples or composites using hot press compression molding. However, different processing variables such as temperature, pressure, compression time, holding and cooling time played huge roles. Each of these variables were investigated in order to optimize the PLA properties. Composites samples were also produced using the optimized processing parameters. These samples were then tested for tensile strength, which was 2.2 Mpa, flexural strength, 7.6 Mpa, Rockwell hardness C scale, 59, and dielectric constant/loss. The highest dielectric constant value achieved was 1.07810 at 1kHz frequency, and the highest amount of dielectric loss was 0.14910 at 2MHz frequency.

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Selection and impact of leading edge on boundary layer transition

Research Square

引用

Research Square 2020年

作者： Bhatia, Dinesh Devraj Yadav, Devinder Yang, Guangjun Wang, Jian School of Aerospace Engineering University of Glasgow 599493 Singapore School of Aerospace Engineering University of Nottingham Ningbo315100 China School of Aeronautics Northwestern Polytechnical University Xi’an710072 China Faculty of Science Engineering and Computing Kingston University London LondonSW15 3DW United Kingdom

The choice of leading edge aspect ratio (AR) plays a crucial role when planning boundary layer experimental wind tunnel tests on a flat plate. Poor selection of the leading-edge profile hampers the effectiveness of the experiment and increases testing costs associated with interchanging of leading edges to attain accurate results. Thus, the appropriate selection of the leading edge is a very crucial part of the wind tunnel experimental process. The authors, in this paper, argue that the curvature of the leading edge and thus the AR are of paramount importance to attain accurate results from wind tunnel testing. In this paper, the authors have tested 7 different elliptical leading edges and compared their performance with an ideal leading edge with zero thickness. Experimental and computational has been presented for leading edges ranging from AR6 to AR20. Results were evaluated for boundary layer transition onset location and it was found that AR20 has the least influence on the flow structure when compared the ideal leading edge. A study of the flow structure at the stagnation point indicates an increase in adverse pressure gradient with an increase in the AR but also a decrease in the size of the stagnation region. The presence of a higher AR leading edge reduces the turbulent spot production rate which is one of the primary causes of boundary layer transition. The authors have presented a correlation which makes it easier for aerodynamicists to quantify the impact of the leading-edge AR on transition. A case is also presented to compare the relative performance of a wedge and the higher AR leading edge which gives potential researchers the choice between an elliptical or a wedge-shaped leading edge. © 2020, CC BY.

关键词： Aspect ratio

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