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Attachment ability of combined biomimetic adhesive micro-textures of different shapes

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Friction 2023年第8期11卷 1430-1441页

作者： David BADLER yuri KLIGERMAN Haytam KASEM Faculty of Mechanical Engineering Technion-Israel Institute of TechnologyHaifa 3200003Israel Department of Mechanical Engineering Azrieli College of EngineeringJerusalem 9103501Israel

There are various potential applications of biomimetic adhesive solutions including climbing robotic systems,mobile sensor platforms,and biomedical applications such as patches for external *** resistance to both normal and tangential loads,however,is a critical issue that still needs to be *** animals have developed exceptional attachment mechanisms based on combined fibrillar elements of different shapes and *** investigation of combined biomimetic adhesive micro-textures on tribological performances such as adhesion,friction,and peeling resistance is needed to apply this idea to the design of an artificial texture having similar“biomimetic”*** the present study,we demonstrate that combinations of different shapes of biomimetic adhesive micro-textures show increased efficiency under different contact environments and enable long-term adhesive *** work sheds light on combinations of different element shapes inspired by nature and their adhesive efficiency as a function of the ratio of each biomimetic element,as well as their spatial repartition.

关键词： biomimetic micro-textures adhesion friction peeling

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Seeing is believing

Light(Science & Applications) 2022年第3期11卷 6-7页

作者： Sergey Krasikov yuri Kivshar Nonlinear Physics Center Research School of PhysicsAustralian National UniversityCanberra ACT 2601Australia and School of Physics and EngineeringITMO UniversitySt.Petersburg197101Russia

Bound states in the continuum are realized in many optical systems as“dark states”,and their presence can be detected in the regime of leaky modes via resonances in *** the authors reveal previously unseen structure... 详细信息

关键词： states dielectric continuum

One-Variable Attack on the Industrial Fault Classification System and Its Defense

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Engineering 2022年第12期19卷 240-251页

作者： Yue Zhuo yuri A.W.Shardt Zhiqiang Ge State Key Laboratory of Industrial Control Technology College of Control Science and EngineeringZhejiang UniversityHangzhou 310027China Department of Automation Engineering Technische Universität IlmenauIlmenau D-98684Germany

Recently developed fault classification methods for industrial processes are mainly ***,models based on deep neural networks have significantly improved fault classification accuracy owing to the inclusion of a large number of data ***,these data-driven models are vulnerable to adversarial attacks;thus,small perturbations on the samples can cause the models to provide incorrect fault *** recent studies have demonstrated the vulnerability of machine learning methods and the existence of adversarial *** paper proposes a black-box attack method with an extreme constraint for a safe-critical industrial fault classification system:Only one variable can be perturbed to craft adversarial ***,to hide the adversarial samples in the visualization space,a Jacobian matrix is used to guide the perturbed variable selection,making the adversarial samples in the dimensional reduction space invisible to the human *** the one-variable attack(OVA)method,we explore the vulnerability of industrial variables and fault types,which can help understand the geometric characteristics of fault classification *** on the attack method,a corresponding adversarial training defense method is also proposed,which efficiently defends against an OVA and improves the prediction accuracy of the *** experiments,the proposed method was tested on two datasets from the Tennessee–Eastman process(TEP)and steel plates(SP).We explore the vulnerability and correlation within variables and faults and verify the effectiveness of OVAs and defenses for various classifiers and *** industrial fault classification systems,the attack success rate of our method is close to(on TEP)or even higher than(on SP)the current most effective first-order white-box attack method,which requires perturbation of all variables.

关键词： Adversarial samples Black-box attack Industrial data security Fault classification system

cell2mol:encoding chemistry to interpret crystallographic data

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npj Computational Materials 2022年第1期8卷 1787-1794页

作者： Sergi Vela Ruben Laplaza yuri Cho Clémence Corminboeuf Laboratory for Computational Molecular Design(LCMD) Institute of Chemical Sciences and Engineering(ISIC)École Polytechnique Fédérale de Lausanne(EPFL)CH-1015LausanneSwitzerland National Centre for Computational Design and Discovery of Novel Materials(NCCR MARVEL) Ecole Polytechnique Fédérale de Lausanne1015LausanneSwitzerland National Centre for Competence in Research“Sustainable chemical processes through catalysis(NCCR Catalysis)” École Polytechnique Fédérale de Lausanne1015LausanneSwitzerland

The creation and maintenance of crystallographic data repositories is one of the greatest data-related achievements in *** such as the Cambridge Structural Database host what is likely the most diverse collection of synthesizable *** properly mined,they could be the basis for the large-scale exploration of new regions of the chemical space using quantum chemistry(QC).Yet,it is currently challenging to retrieve all the necessary information for QC codes based exclusively on the available structural data,especially for transition metal *** overcome this limitation,we present cell2mol,a software that interprets crystallographic data and retrieves the connectivity and total charge of molecules,including the oxidation state(OS)of metal *** demonstrate that cell2mol outperforms other popular methods at assigning the metal OS,while offering a comprehensive interpretation of the unit *** code is made available,as well as reliable QC-ready databases totaling 31k transition metal complexes and 13k ligands that contain incomparable chemical diversity.

关键词： offering overcome properly

Intelligent metaphotonics empowered by machine learning

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Opto-Electronic Advances 2022年第3期5卷 1-24页

作者： Sergey Krasikov Aaron Tranter Andrey Bogdanov yuri Kivshar Nonlinear Physics Center Research School of PhysicsThe Australian National UniversityCanberra ACT 2601Australia School of Physics and Engineering ITMO UniversitySt.Petersburg 197101Russia Centre for Quantum Computation and Communication Technology Department of Quantum ScienceResearch School of PhysicsThe Australian National UniversityCanberraACT 2601Australia

In the recent years,a dramatic boost of the research is observed at the junction of photonics,machine learning and artifi-cial intelligence.A new methodology can be applied to the description of a variety of photonic systems including optical waveguides,nanoantennas,and *** novel approaches underpin the fundamental principles of light-matter interaction developed for a smart design of intelligent photonic *** intelligence and machine learn-ing penetrate rapidly into the fundamental physics of light,and they provide effective tools for the study of the field of metaphotonics driven by optically induced electric and magnetic *** we overview the evaluation of meta-photonics induced by artificial intelligence and present a summary of the concepts of machine learning with some specif-ic examples developed and demonstrated for metasystems and metasurfaces.

关键词： metaphotonics machine learning artificial intelligence

Impulse controls in optimal harvesting of age-structured populations

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生物数学学报:英文版 2023年第7期16卷 197-218页

作者： Natali Hritonenko Nobuyuki Kato yuri Yatsenko Department of Mathematics Prairie View A&M University PrairieViewTX77446USA Faculty of Electrical and Computer Engineering Kanazawa University Kanazawa920-1192Japan Dunham College of Business Houston Baptist University 7502FondrenHouston TX 77074USA

A nonlinear optimal control problem in the Lotka-McKendrick population model is *** describes rational management of age-structured farmed populations in aquaculture and indoor *** generalized functions,we prove the impulse nature of optimal *** analytic solutions for sustainable harvesting strategies are obtained and used to analyze the optimal dynamics of harvesting age and rotation under technological innovations.

关键词： Age-structured populations aquaculture optimal harvesting relaxed optimal controls Dirac measure

Experimental demonstration of robust nanophotonic devices optimized by topological inverse design with energy constraint

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Photonics Research 2022年第7期10卷 1787-1802页

作者： GUOWU ZHANG DAN-XIA XU yuri GRINBERG ODILE LIBOIRON-LADOUCEUR Department of Electrical and Computer Engineering McGill UniversityMontréalQuebec H3A 0E9Canada National Research Council Canada OttawaOntario K1A 0R6Canada

In this paper,we present the experimental results for integrated photonic devices optimized with an energyconstrained inverse design *** this constraint is applied,optimizations are directed to solutions that contain the optical field inside the waveguide core medium,leading to more robust designs with relatively larger minimum feature *** optimize three components:a mode converter(MC),a 1310 nm/1550 nm wavelength duplexer,and a three-channel C-band wavelength demultiplexer for coarse wavelength division multiplexing(CWDM)application with 50 nm channel *** energy constraint leads to nearly binarized structures without applying independent binarization *** also reduces the appearance of small *** the MC,well-binarized design,improved insertion loss,and cross talk are obtained as a ***,the proposed constraint improves the robustness to fabrication imperfections as shown in the duplexer *** energy constraint optimization,the corresponding spectrum shifts for the duplexer under±10 nm dimensional variations are reduced from 105 nm to 55 nm and from 72 nm to 60 nm for the 1310 nm and 1550 nm channel,*** the CWDM demultiplexer,robustness toward±10 nm fabrication error is improved by a factor of *** introduction of the energy constraint into topological optimization demonstrates computational gain with better-performing designs.

关键词： waveguide constraint inverse

A Semi-Implicit Fractional Step Method Immersed Boundary Method for the Numerical Simulation of Natural Convection Non-Boussinesq Flows

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Communications in Computational Physics 2022年第8期32卷 737-778页

作者： Dmitry Zviaga Ido Silverman Alexander Gelfgat yuri Feldman Department of Mechanical Engineering Ben-Gurion University of the NegevP.O.Box 653Beer-Sheva 84105Israel Soreq Nuclear Research Center 81000 YavneIsrael School of Mechanical Engineering Tel Aviv UniversityTel Aviv 6997801Israel

The paper presents a novel pressure-corrected formulation of the immersed boundary method(IBM)for the simulation of fully compressible non-Boussinesq natural convection *** formulation incorporated into the pressure-based fractional step approach facilitates simulation of the flows in the presence of an immersed body characterized by a complex ***,we first present extensive grid independence and verification studies addressing incompressible pressure-driven flow in an extended channel and non-Boussinesq natural convection flow in a differentially heated ***,the steady-state non-Boussinesq natural convection flow developing in the presence of hot cylinders of various diameters placed within a cold square cavity is thoroughly *** obtained results are presented and analyzed in terms of the spatial distribution of path lines and temperature fields and of heat flux values typical of the hot cylinder and the cold cavity *** characteristics of multiple steady-state solutions discovered for several configurations are presented and discussed in detail.

关键词： Natural convection non-Boussinesq flows pressure-corrected immersed boundary method multiple steady state solutions

Isotopic Composition of Atmospheric Precipitation in the Cis-Ural Region

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Journal of Earth Science 2022年第3期33卷 831-838页

作者： Alena S.Kazantseva Olga I.Kadebskaya yuri V.Dublyansky Mining Institute of the Ural Branch of the Russian Academy of Sciences PermRussia Institute of Geology University of InnsbruckInnsbruckAustria

Using the Global Network of Isotopes in Precipitation(GNIP)method at three stations in the Cis-Ural region(Iskor,Perm,and Kungur),the monitoring results of the isotope composition of atmospheric precipitation conducted in 2016-2019 are *** lines of meteoric waters were obtained for each station and for the Cis-Ural region as a *** latitudinal zoning of changes in isotope parameters from north to south in the Cis-Ural region is noted,which is related to meteorological *** northern regions are characterized by isotopically light values compared to the southern ***,the correlation relationship between the isotopic compositions of atmospheric precipitation and meteorological parameters at each station is *** analysis data show that about 50%-90%of variations in the isotopic composition of precipitation within the annual cycle are determined by the air *** the same time,the amount of precipitation shows a relationship between the average strength and the isotopic composition of precipitation for a series of observations at Kungur Station;for a series of observations at Iskor and Perm stations,there is no *** in the relationship with meteorological data are explained by different sources of moisture introduction to the station and,accordingly,the formation of the isotopic composition of *** flow of moisture is controlled by the transfer of air masses in different directions,the formation of cyclones and ***,for the northern part of the region during the year is characterized by the predominance of cyclones,whereas for the southern-anticyclones.

关键词： precipitation isotopic composition Cis-Ural region correlation relationship Spear-man’s correlation coefficient