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arXiv 2019年

作者： Ochmann, Sebastian Klein, Reinhard Institute of Computer Science II University of Bonn Germany

Orienting surface normals correctly and consistently is a fundamental problem in geometry processing. Applications such as visualization, feature detection, and geometry reconstruction often rely on the availability of correctly oriented normals. Many existing approaches for automatic orientation of normals on meshes or point clouds make severe assumptions on the input data or the topology of the underlying object which are not applicable to real-world measurements of urban scenes. In contrast, our approach is specifically tailored to the challenging case of unstructured indoor point cloud scans of multi-story, multi-room buildings. We evaluate the correctness and speed of our approach on multiple real-world point cloud datasets. Copyright © 2019, The Authors. All rights reserved.

关键词： Geometry

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Duality in vector optimization with domination structures

Applied Set-Valued Analysis and Optimization

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Applied Set-Valued Analysis and Optimization 2019年第3期1卷 319-335页

作者： Bao, Truong Quang Le, Thanh T.A.M. Tammer, Christiane Tuan, Vu A.N.H. Department of Mathematics and Computer Science Northern Michigan University United States Institute of Mathematics Faculty of Natural Sciences II Martin-Luther-University Halle-Wittenberg Germany Faculty of Basic Sciences University of Transport and Communications Hanoi Viet Nam

In this paper, we study duality schemes for vector optimization problems with respect to variable domination structures by using an appropriate extension of the so-called Gerstewitz nonlinear scalarization function for dealing with weakly nondominated solutions. We apply these results to multiobjective location problems with variable domination structures. For nondominated solutions, we use a general scalarization function which is strictly monotone with respect to the domination structure. The strict monotonicity of our proposed function is also discussed. © 2019 Applied Set-Valued Analysis and Optimization.

关键词： Multiobjective optimization

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Generation of simple, connected, non-isomorphic random graphs 6th

Generation of simple, connected, non-isomorphic random graph...

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6th International Doctoral Symposium on Applied Computation and Security Systems, ACSS 2019

作者： Chakraborty, Maumita Chowdhury, Sumon Pal, Rajat Kumar Department of Information Technology Institute of Engineering and Management Salt Lake Sector V Kolkata700091 India Tata Consultancy Services Gitanjali Park Action Area II New Town Kolkata700156 India Department of Computer Science and Engineering University of Calcutta JD-2 Sector III Salt Lake Kolkata700106 India

ISBN: (纸本)9789811389610

In graph theory, generation of random graphs finds a wide range of applications in different scheduling problems, approximation algorithms, problems involving modeling and simulation, different database applications, and obviously to test the performance of any algorithm. The algorithm, which has been devised in this paper, is mainly for the purpose of providing test bed for checking performance of other algorithms. It generates different non-isomorphic graph instances of a given order and having unique number of edges. The number of such instances possible for a graph of given order has also been subsequently formulated. Different such graph instances of different orders, generated in a uniform computing environment, and the computing time required for such generations have also been included in this paper. The simplicity and efficiency of the algorithm, subsequently proved in the paper, give us a new insight in the area of random graph generation and have called for further research scope in the domain. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Graph theory

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PIEMAP: Personalized inverse eikonal model from cardiac electro-anatomical maps

arXiv

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arXiv 2020年

作者： Grandits, Thomas Pezzuto, Simone Lubrecht, Jolijn M. Pock, Thomas Plank, Gernot Krause, Rolf Institute of Computer Graphics and Vision Graz University of Technology Austria Center for Computational Medicine in Cardiology Institute of Computational Science Università della Svizzera italiana Lugano Switzerland Institute of Biophysics Medical University of Graz Austria BioTechMed-Graz Austria

Electroanatomical mapping, a keystone diagnostic tool in cardiac electrophysiology studies, can provide high-density maps of the local electric properties of the tissue. It is therefore tempting to use such data to better individualize current patient-specific models of the heart through a data assimilation procedure and to extract potentially insightful information such as conduction properties. Parameter identification for state-of-the-art cardiac models is however a challenging task. In this work, we introduce a novel inverse problem for inferring the anisotropic structure of the conductivity tensor, that is fiber orientation and conduction velocity along and across fibers, of an eikonal model for cardiac activation. The proposed method, named PIEMAP, performed robustly with synthetic data and showed promising results with clinical data. These results suggest that PIEMAP could be a useful supplement in future clinical workflows of personalized therapies. Copyright © 2020, The Authors. All rights reserved.

关键词： Heart

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On the origin of molecular oxygen on the surface of Ganymede

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ICARUS 2022年 383卷

作者： Migliorini, A. Kanuchova, Z. Ioppolo, S. Barbieri, M. Jones, N. C. Hoffmann, S. V. Strazzulla, G. Tosi, F. Piccioni, G. [a]Institute of Space Astrophysics and Planetology IAPS-INAF Rome 00133 Italy [b]Astronomical Institute of Slovak Academy of Sciences Tatranská Lomnica 059 60 Slovakia [c]School of Electronic Engineering and Computer Science Queen Mary University of London London E1 4NS UK [d]Therma GmbH Europaarkaden II Bratustrasse 7 64293 Darmstadt Germany [e]ISA Department of Physics and Astronomy Aarhus University 8000 Aarhus C Denmark [f]Osservatorio Astrofisico di Catania INAF Catania 95123 Italy

Since its first identification on the surface of Ganymede in 1995, molecular oxygen (O-2) ice has been at the center of a scientific debate as the surface temperature of the Jovian moon is on average well above the freezing point of O-2. Laboratory evidence suggested that solid O-2 may either exist in a cold (< 50 K) subsurface layer of the icy surface of Ganymede, or it is in an atmospheric haze of the moon. Alternatively, O-2 is constantly replenished at the surface through ion irradiation of water-containing ices. A conclusive answer on the existence of solid O-2 on the surface of Ganymede is hampered by the lack of detailed, extensive observational datasets. We present new ground-based, high-resolution spectroscopic observations of Ganymede's surface obtained at the Telescopio Nazionale Galileo. These are combined with dedicated laboratory measurements of ultraviolet-visible (UV-vis) photoabsorption spectra of O-2 ice, both pure and mixed with other species of potential interest for the Galilean satellites. Our study confirms that the two bands identified in the visible spectra of Ganymede's surface are due to the (1,0) and (0,0) transition bands of O-2 ice. Oxygen-rich ice mixtures including water (H2O) and carbon dioxide (CO2) can reproduce observational reflectance data of the Ganymede's surface better than pure O-2 ice in the temperature range 20-35 K. Solid H2O and CO2 also provide an environment where O-2 ice can be trapped at higher temperatures than its pure ice desorption under vacuum space conditions. Our experiments at different temperatures show also that the (1,0)/(0,0) ratio in case of the CO2:O-2 = 1:2 ice mixture at 35 K has the closest value to observations, while at 30 K the (1,0)/(0,0) ratio seems to be mixture independent with the exception of the N-2:O-2 = 1:2 ice mixture. The present work will be part of a laboratory spectroscopic database in support of the ESA/JUICE mission to the Jovian system.

关键词： Cosmochemistry- ultraviolet observations- ices UV spectroscopy-Jupiter Satellites-satellites Surfaces

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A review of medical artificial intelligence

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Global Health Journal 2020年第2期4卷 42-45页

作者： Rong Liu Yan Rong Zhehao Peng Institute of Medical Innovation and Transformation Puren Hospital of Wuhan1 Benxi RoadWuhan 430081China School of Medicine Wuhan University of Science and TechnologyNo.1Huangjia Lake University TownWuhan 430065China Department of Computer Science College of EngineeringNorth Carolina State UniversityCampus Box 8206890 Oval DriveEngineering Building IIRaleighNC 27695USA

Since the concept of“artificial intelligence”was introduced in 1956,it has led to numerous technological innovations in human medicine and completely changed the traditional model of *** this study,we mainly explain the application of artificial intelligence in various fields of medicine from four aspects:machine learning,intelligent robot,image recognition technology,and expert *** addition,we discuss the existing problems and future trends in these *** recent years,through the development of globalization,various research institutions around the world has conducted a number of researches on this ***,medical artificial intelligence has attained significant breakthroughs and will demonstrate wide development prospection in the future.

关键词： Medical artificial intelligence Machine learning Intelligent robot Image recognition Expert system

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Localization transition induced by programmable disorder

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Physical Review B 2022年第13期105卷 134201-134201页

作者： Jaime L. C. da C. Filho Zoe Gonzalez Izquierdo Andreia Saguia Tameem Albash Itay Hen Marcelo S. Sarandy Instituto Federal do Pará - Campus Castanhal BR 316 Km 61 Saudade II 68740-970 Castanhal PA Brazil QuAIL NASA Ames Research Center Moffett Field California 94035 USA USRA Research Institute for Advanced Computer Science Mountain View California 94043 USA Instituto de Física Universidade Federal Fluminense Av. Gal. Milton Tavares de Souza s/n Gragoatá 24210-346 Niterói Rio de Janeiro Brazil Department of Electrical and Computer Engineering University of New Mexico Albuquerque New Mexico 87131 USA Department of Physics and Astronomy and Center for Quantum Information and Control CQuIC University of New Mexico Albuquerque New Mexico 87131 USA Department of Physics and Astronomy and Center for Quantum Information Science & Technology University of Southern California Los Angeles California 90089 USA Information Sciences Institute University of Southern California Marina del Rey California 90292 USA

We investigate the occurrence of many-body localization (MBL) on a spin-1/2 transverse-field Ising model defined on a Chimera connectivity graph with random exchange interactions and longitudinal fields. We observe a transition from an ergodic phase to a nonthermal phase for individual energy eigenstates induced by a critical disorder strength for the Ising parameters. Our result follows from the analysis of both the mean half-system block entanglement and the energy-level statistics. We identify the critical point associated with this transition using the maximum variance of the block entanglement over the disorder ensemble as a function of the disorder strength. The calculated energy density phase diagram shows the existence of a mobility edge in the energy spectrum. In terms of the energy-level statistics, the system changes from the Gaussian orthogonal ensemble for weak disorder to a Poisson distribution limit for strong randomness, which implies localization behavior. We then realize the time-independent disordered Ising Hamiltonian experimentally using a reverse annealing quench-pause-quench protocol on a D-wave 2000Q programmable quantum annealer. We characterize the transition from the thermal to the localized phase through magnetization measurements at the end of the annealing dynamics, and the results are compatible with our theoretical prediction for the critical point. However, the same behavior can be reproduced using a classical spin-vector Monte Carlo simulation, which suggests that genuine quantum signatures of the phase transition remain out of reach using this experimental platform and protocol.

关键词： Adiabatic quantum optimization Many-body localization Disordered systems Quantum spin models Annealing

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Modeling of adsorptive removal of azithromycin from aquatic media by CoFe₂O₄_/NiO anchored microalgae-derived nitrogen-doped porous activated carbon adsorbent and colorimetric quantifying of azithromycin in pharmaceutical products

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Chemosphere 2023年第1期329卷 138635页

作者： Ameen, Fuad Mostafazadeh, Reza Hamidian, Yasamin Erk, Nevin Sanati, Afsaneh L. Karaman, Ceren Ayati, Ali Department of Botany and Microbiology College of Science King Saud University Riyadh 11451 Saudi Arabia Ankara University Faculty of Pharmacy Department of Analytical Chemistry Ankara 06560 Turkey Institute of Systems and Robotics Department of Electrical and Computer Engineering University of Coimbra Polo II Coimbra 3030-290 Portugal Akdeniz University Vocational School of Technical Sciences Department of Electricity and Energy Antalya 07070 Turkey ChemBio Cluster ITMO University Lomonosova Street 9 Saint Petersburg 191002 Russian Federation

Herein, it was aimed to optimize the removal process of Azithromycin (Azi) from the aquatic environment via CoFe2O4/NiO nanoparticles anchored onto the microalgae-derived nitrogen-doped porous activated carbon (N-PAC)... 详细信息

Herein, it was aimed to optimize the removal process of Azithromycin (Azi) from the aquatic environment via CoFe₂O₄_/NiO nanoparticles anchored onto the microalgae-derived nitrogen-doped porous activated carbon (N-PAC), besides developing a colorimetric method for the swift monitoring of Azi in pharmaceutical products. In this study, the Spirulina platensis (Sp) was used as a biomass resource for fabricating CoFe₂O₄/NiO@N-PAC adsorbent. The pores of N-PAC mainly entail mesoporous structures with a mean pore diameter of 21.546 nm and total cavity volume (V_total) of 0.033578 cm³. g⁻¹. The adsorption studies offered that 98.5% of Azi in aqueous media could remove by CoFe₂O₄/NiO@N-PAC. For the cyclic stability analysis, the adsorbent was separated magnetically and assessed at the end of five adsorption-desorption cycles with a negligible decrease in adsorption. The kinetic modeling revealed that the adsorption of Azi onto the CoFe₂O₄/NiO@N-PAC was well-fitted to the second-order reaction kinetics, and the highest adsorption capacity was found as 2000 mg. g⁻¹ at 25 °C based on the Langmuir adsorption isotherm model at 0.8 g. L⁻¹ adsorbent concentration. The Freundlich isotherm model had the best agreement with the experimental data. Thermodynamic modeling indicated the spontaneous and exothermic nature of the adsorption process. Moreover, the effects of pH, temperature, and operating time were also optimized in the colorimetric Azi detection. The blue ion-pair complexes between Azi and Coomassie Brilliant Blue G-250 (CBBG-250) reagent followed Beer's law at wavelengths of 640 nm in the concentration range of 1.0 μM to 1.0 mM with a 0.94 μM limit of detection (LOD). In addition, the selectivity of Azi determination was verified in presence of various species. Furthermore, the applicability of CBBG-250 dye for quantifying

关键词： Adsorption Adsorption modeling Azithromycin Biomass-derived activated carbon Spectrophotometry Spirulina platensis

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Persistent flat band splitting and strong selective band renormalization in a kagome magnet thin film

arXiv

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arXiv 2024年

作者： Ren, Zheng Huang, Jianwei Tan, Hengxin Biswas, Ananya Pulkkinen, Aki Zhang, Yichen Xie, Yaofeng Yue, Ziqin Chen, Lei Xie, Fang Allen, Kevin Wu, Han Ren, Qirui Rajapitamahuni, Anil Kundu, Asish K. Vescovo, Elio Kono, Junichiro Morosan, Emilia Dai, Pengcheng Zhu, Jian-Xin Si, Qimiao Minár, Ján Yan, Binghai Yi, Ming Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Condensed Matter Physics Weizmann Institute of Science Rehovot Israel New Technologies-Research Center University of West Bohemia Plzeň301 00 Czech Republic Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States National Synchrotron Light Source II Brookhaven National Lab UptonNY United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Chemistry Rice University HoustonTX77005 United States Theoretical Division Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM United States

Magnetic kagome materials provide a fascinating playground for exploring the interplay of magnetism, correlation and topology. Many magnetic kagome systems have been reported including the binary FemXn (X=Sn, Ge;m:n = 3:1, 3:2, 1:1) family and the rare earth RMn6Sn6 (R = rare earth) family, where their kagome flat bands are calculated to be near the Fermi level in the paramagnetic phase. While partially filling a kagome flat band is predicted to give rise to a Stoner-type ferromagnetism, experimental visualization of the magnetic splitting across the ordering temperature has not been reported for any of these systems due to the high ordering temperatures, hence leaving the nature of magnetism in kagome magnets an open question. Here, we probe the electronic structure with angle-resolved photoemission spectroscopy in a kagome magnet thin film FeSn synthesized using molecular beam epitaxy. We identify the exchange-split kagome flat bands, whose splitting persists above the magnetic ordering temperature, indicative of a local moment picture. Such local moments in the presence of the topological flat band are consistent with the compact molecular orbitals predicted in theory. We further observe a large spin-orbital selective band renormalization in the Fe dxy+dx2-y2spin majority channel reminiscent of the orbital selective correlation effects in the iron-based superconductors. Our discovery of the coexistence of local moments with topological flat bands in a kagome system echoes similar findings in magic-angle twisted bilayer graphene, and provides a basis for theoretical effort towards modeling correlation effects in magnetic flat band systems. © 2024, CC BY.

关键词： Iron-based Superconductors

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Unveiling the Role of Biological and Environmental Factors and the Piscivory in the Recruitment Success of Pikeperch (Stizostedion Lucioperca)

SSRN

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SSRN 2024年

作者： Tesfaye, Million Jůza, Tomáš Šmejkal, Marek Soukalová, Katerina Bartoň, Daniel Blabolil, Petr Čech, Martin Hejzlar, Josef Prchalová, Marie Muška, Milan Tušer, Michal Kočvara, Luboš Sajdlová, Zuzana Draštík, Vladislav Martinez, Carlos de Moraes, Karlos Ribeiro Říha, Milan Vašek, Mojmír Symonová, Radka Brabec, Marek Kubečka, Jan Souza, Allan T. Biology Centre of the Czech Academy of Sciences Institute of Hydrobiology Na Sádkách 7 České Budějovice370 05 Czech Republic Faculty of Fisheries and Protection of Waters South Bohemian Research Centre for Aquaculture and Biodiversity of Hydrocenoses University of South Bohemia in České Budějovice Zátiší 728/II Vodňany389 25 Czech Republic University of South Bohemia Faculty of Science Department of Ecosystem Biology Branišovská 1760a České Budějovice370 05 Czech Republic School of Biochemical Engineering Pontificia Universidad Católica de Valparaíso Av. Brasil 2085 Valparaíso2340000 Chile Institute of Computer Science Czech Academy of Sciences Prague182 00 Czech Republic Institute for Atmospheric and Earth System Research INAR Forest Sciences Faculty of Agriculture and Forestry University of Helsinki P.O. Box 27 00014 Finland

Pikeperch (Sander lucioperca) is an important fish species in Eurasian water bodies. However, its recruitment has declined in some lakes, necessitating a better understanding of its ecological process. In the first summer, young-of-the-year (YOY) pikeperch can be grouped into three sub-cohorts: extremely small (ES), ordinary fingerlings, and piscivorous. We analyzed 12 years of biotic and abiotic data collected between 2003 and 2022 at Lipno Reservoir (Czechia) to identify drivers of variability in the abundance of piscivorous YOY pikeperch and their impact on the new year class. Using the Bayesian horseshoe prior approach and linear regression, we observed that a higher abundance of ES conspecifics and YOY perch, coupled with increased densities of large cladocerans in July and August, positively impacted the abundance of piscivorous YOY. Additionally, August precipitation positively affected this sub-cohort. The abundance of 1+ pikeperch was positively influenced by the abundance of piscivorous and ordinary YOYs recorded in the preceding year. We concluded that all three sub-cohorts contribute to the recruitment success of pikeperch, with piscivorous and ordinary sub-cohorts having a more direct effect, while ES sub-cohorts indirectly enhance piscivory pikeperch. The study provides novel insight into factors influencing the recruitment success of pikeperch and aids forecasting capabilities. © 2024, The Authors. All rights reserved.

关键词： Reservoirs (water)

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