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Spatio-temporal coupled mode theory for nonlocal metasurfaces

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Light(Science & Applications) 2024年第2期13卷 267-282页

作者： Adam Overvig sander A.Mann Andrea Alù Photonics Initiative Advanced Science Research CenterCity University of New YorkNew YorkNY10031USA Physics Program Graduate Center of the City University of New YorkNew YorkNY10016USA

Diffractive nonlocal metasurfaces have recently opened a broad range of exciting developments in nanophotonics research and applications,leveraging spatially extended—yet locally patterned—resonant modes to control light with new degrees of *** conventional grating responses are elegantly captured by temporal coupled mode theory,current approaches are not well equipped to capture the arbitrary spatial response observed in the nascent field of nonlocal ***,we introduce spatio-temporal coupled mode theory(STCMT),capable of elegantly capturing the key features of the resonant response of wavefront-shaping nonlocal *** framework can quantitatively guide nonlocal metasurface design while maintaining compatibility with local metasurface frameworks,making it a powerful tool to rationally design and optimize a broad class of ultrathin optical *** validate this STCMT framework against full-wave simulations of various nonlocal metasurfaces,demonstrating that this tool offers a powerful semi-analytical framework to understand and model the physics and functionality of these devices,without the need for computationally intense full-wave *** also discuss how this model may shed physical insights into nonlocal phenomena in photonics and the functionality of the resulting *** a relevant example,we showcase STCMT’s flexibility by applying it to study and rapidly prototype nonlocal metasurfaces that spatially shape thermal emission.

关键词： theory resonant spatially

Annealing-induced long-range charge density wave order in magnetic kagome FeGe:Fluctuations and disordered structure

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Science China(Physics,Mechanics & Astronomy) 2024年第11期Mechanics & Astronomy) .卷 116-125页

作者： Chenfei Shi Yi Liu Bishal Baran Maity Qi Wang Surya Rohith Kotla Sitaram Ramakrishnan Claudio Eisele Harshit Agarwal Leila Noohinejad Qian Tao Baojuan Kang Zhefeng Lou Xiaohui Yang Yanpeng Qi Xiao Lin Zhu-An Xu Arumugam Thamizhavel Guang-Han Cao sander van Smaalen Shixun Cao Jin-Ke Bao Department of Physics Materials Genome Institute Institute for Quantum Science and TechnologyShanghai University Key Laboratory of Quantum Precision Measurement of Zhejiang Province School of Physics Zhejiang University of Technology School of Physics Zhejiang University Department of Condensed Matter Physics and Materials Science Tata Institute of Fundamental Research School of Physical Science and Technology ShanghaiTech University ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Laboratory of Crystallography University of Bayreuth Department of Quantum Matter AdSE Hiroshima University P24 PETRA Ⅲ Deutsches Elektronen-Synchrotron DESY Key Laboratory for Quantum Materials of Zhejiang Province School of Science Westlake University Department of Physics China Jiliang University Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech University Collaborative Innovation Centre of Advanced Microstructures Nanjing University Shanghai Key Laboratory of High Temperature Superconductors Shanghai University School of Physics Hangzhou Normal University

Charge density wave（CDW） in kagome materials with the geometric frustration is able to carry unconventional ***, a CDW has been observed below the antiferromagnetic order in kagome FeGe, in which magnetism and CDW are intertwined to form an emergent quantum ground state. However, the CDW is only short-ranged and the structural modulation originating from it has yet to be determined experimentally. Here we realize a long-range CDW order by post-annealing process,and resolve the structure model through single crystal X-ray diffraction. Occupational disorder of Ge resulting from short-range CDW correlations above TCDWis identified from structure refinements. The partial dimerization of Ge along the c axis is unveiled to be the dominant distortion for the CDW. Occupational disorder of Ge is also proved to exist in the CDW phase due to the random selection of partially dimerized Ge sites. Our work provides useful insights for understanding the unconventional nature of the CDW in FeGe.

关键词： charge density wave kagome disordered structure fluctuations

Dynamic flowsheet simulation of re-entrainment from particle layers formed inside electrostatic precipitators

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Particuology 2020年第6期18卷 41-47页

作者： Soren sander Udo Fritsching Particles and Process Engineering University of BremenBibliothekstrasse 128359 BremenGermany Process Engineering Leibniz-lnstitutfiir Werkstofforientierte Technologien-IWTBadgasteiner Strasse 328359 BremenGermany

Electrostatic precipitators clean away the particulate matter of exhaust gases in manifold industrial *** studies of particle separation in the size range of several 100 nm to 25μm is of particular interest for the prediction of precipitation efficiencies and *** typically cover the transport of particles towards walls of the ***,no model yet covers the possible re-entrainment of particles from layers formed at the walls back into the gas *** study presents the implementation of a new time-resolving model for electrostatic precipitation utilizing a re-entrainment *** data support the results of *** model uses a statistical approach based on properties of the particulate layer forming at the precipitator *** model is used for the analysis of the redispersion of particles in a laboratory-scale electrostatic precipitator(sander,Gawor,&Fritsching,2018).Results show reduced precipitation efficiencies for particles larger than 5μm as particles have higher kinetic impact energies and lower bounding energy at the layer *** dynamics reveal a steady-state behavior of the separation for CaCO3(limestone,trademark"Ulmer WeissR")while Al2O3(trademark"Pural NFR")precipitation is affected by layer buildup at the walls increasing over several minutes.

关键词： Electrostatic precipitator Flow sheet model Redispersion and re-entrainment Gas cleaning Particle layer

Acquired cancer tyrosine kinase inhibitor resistance: ROS as critical determinants

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Signal Transduction and Targeted Therapy 2022年第1期7卷 17-18页

作者： sander Bekeschus ZIK plasmatis Leibniz Institute for Plasma Science and Technology(INP)Felix-Hausdorff-Str.217489 GreifswaldGermany

The ability of a minority of cancer cells lineages to withstand drug-induced toxicity and re-enter cell cycling in the presence of the drug has been observed for long,but the underlying mechanisms remained *** work published in Nature by Oren and colleagues used barcode lentiviral library labeling to prominently discern antioxidant profiles,among others,being the primary underlying cellular program that governs proliferation under tyrosine kinase inhibitor(TKI)drug pressure.^(1)

关键词： cancer drug cycling

Separating polydisperse particles using electrostatic precipitators with wire and spiked-wire discharge electrode design

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Particuology 2018年第3期16卷 10-17页

作者： Soren sander Steffen Gawor Udo Fritsching Process Engineering Stiftung Institut ffir Werlcstofftechnik Badgasteiner Strasse 3 28359 Bremen Germany Particles and Process Engineering University of Bremen Bibliothekstrasse 1 28359 Bremen. Germany

Numerical simulations of electrostatic precipitators featuring wire and spiked electrode designs were performed to determine particle behavior and separation efficiency. The applied-voltage mechanism that alters the flow structure of particles through ionic winds and mean electric fields are revealed. Numeri- cal studies throughout the past years have shown these structures for channel and pipe configurations. However, less attention was given to field averaging for the ni,~r-product and electric field. Our study focuses on this averaging and illustrates relevant differences between multidimensional setups concern- ~ng these fields. Turbulence was modeled using the Reynolds-averaged Navier-Stokes equations with a second-order Reynolds-stress-model closure. A high three-dimensionality of the ionic wind-induced turbulence is presented. This leads to an increase in the submicron-particle precipitation rate. The results confirm the dependence of separation efficiency on particle density and permittivity, thereby showing the advantages of spiked wires compared with wire-plate setups used in electrostatic precipitators.

关键词： Electro-hydrodynamic CFD simulation Electrostatic particle precipitation Electrode design Collection efficiency

A Compatible Embedded-Hybridized Discontinuous Galerkin Method for the Stokes-Darcy-Transport Problem

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Communications on Applied Mathematics and Computation 2022年第1期4卷 293-318页

作者： Aycil Cesmelioglu sander Rhebergen Department ofMathematicsandStatistics OaklandUniversityRochesterMI48309USA Department ofAppliedMathematics UniversityofWaterlooWaterlooONN2L3G1Canada

We present a stability and error analysis of an embedded-hybridized discontinuous Galerkin(EDG-HDG)finite element method for coupled Stokes-Darcy flow and *** flow problem,governed by the Stokes-Darcy equations,is discretized by a recently introduced exactly mass conserving EDG-HDG method while an embedded discontinuous Galerkin(EDG)method is used to discretize the transport *** show that the coupled flow and transport discretization are compatible and ***,we show the existence and uniqueness of the semi-discrete transport problem and develop optimal a priori error *** provide numerical examples illustrating the theoretical *** particu-lar,we compare the compatible EDG-HDG discretization to a discretization of the coupled Stokes-Darcy and transport problem that is not *** demonstrate that where the incompatible discretization may result in spurious oscillations in the solution to the trans-port problem,the compatible discretization is free of *** additional numerical example with realistic parameters is also presented.

关键词： Stokes-Darcyflow Coupled flowandtransport Beavers-Joseph-Saffman Embedded andhybridizedmethods Discontinuous Galerkin Multiphysics

TRANSCRANIAL NEAR-INFRARED SPECTROSCOPY OF SMOKING BRAINS

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Journal of Innovative Optical Health Sciences 2009年第3期2卷 227-234页

作者： OLIVIA PUCCI sander STEPANOV VLADISLAV TORONOV Department of Physics Ryerson University 350 Victoria StreetTorontoONCanada M5B 2K3

We used a mobile wireless near-infrared sensor for the noninvasive recording of cerebral hemoglobin concentration changes during cigarette *** measurement included 5 min of rest,5 min of smoking imitation,and 5 min of actual *** observed significant effects of the tobacco smoking on temporal changes in the human brain at time scales ranging from 200 ms to about 1 *** most reproducible effects were an increase of the heartbeat rate and a decrease in the heartbeat power spectral density during *** but highly individual changes due to smoking were observed in temporal patterns of hemodynamic fluctuations in 5–50 s time *** have also found statistically significant slow increases in both oxy-and deoxy-hemoglobin concentrations during smoking.

关键词： Near-infrared spectroscopy hemoglobin brain smoking

Design and Development of a Wheel-less Snake Robot with Active Stiffness Control for Adaptive Pedal Wave Locomotion

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Journal of Bionic Engineering 2019年第4期16卷 593-607页

作者： Mohammadali Javaheri Koopaee sander Bal Christopher Pretty Xiaoqi Chen Mechanical Engineering Department University of CanterburyChristchurch 8041New Zealand Manufacturing Futures Research Institute Swinburne University of TechnologyHawthorn 3122Australia

This paper presents the design and manufacture process of a wheel-less,modular snake robot with series elastic actuators to reliably measure motor torque signal and investigate the effectiveness of active stiffness control for achieving adaptive snake-like locomotion.A polyurethane based elastic element to be attached between the motor and the links at each joint was designed and manufactured using water jet cutter,which makes the final design easier to develop and more cost-effective,compared to existing snake robots with torque measurement *** reliability of such torque measurement mechanism was examined using simulated dynamical model of pedal wave motion,which proves the efficacy of the design.A distributed control system was also designed,which with the help of an admittance controller,enables active control of the joint stiffness to achieve adaptive snake robot pedal wave locomotion to climb over obstacles,which unlike existing methods does not require prior information about the location of the *** effectiveness of the proposed controller in comparison to open-loop control strategy was verified by the number of *** results show the capability of the robot to successfully climb over obstacles with the height of more than 55%of the diameter of the snake robot modules.

关键词： modular snake robot series elastic actuator active stiffness control pedal wave locomotion adaptive locomotion

Obesity Across Cultures

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Fudan Journal of the Humanities and Social Sciences 2016年第1期9卷 5-23页

作者： sander L. Gilmat Emory University Atlanta GA 30345 USA

In a world in which, according to public health authorities and the media, everyone seems to be getting fatter, what does fat mean when we look across cultures？ Is being fat the same in China as in the USA？ How does... 详细信息

关键词： Obesity · China ·History · Culture