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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 al. 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 spatial.y extended—yet local.y 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 rational.y design and optimize a broad class of ultrathin optical.*** val.date this STCMT framework against full-wave simulations of various nonlocal.metasurfaces,demonstrating that this tool offers a powerful semi-anal.tical.framework to understand and model the physics and functional.ty of these devices,without the need for computational.y intense full-wave *** al.o discuss how this model may shed physical.insights into nonlocal.phenomena in photonics and the functional.ty of the resulting *** a relevant example,we showcase STCMT’s flexibility by applying it to study and rapidly prototype nonlocal.metasurfaces that spatial.y shape thermal.emission.

关键词： theory resonant spatial.y

Linear-Quadratic Pareto Cooperative Game for Mean-Field Backward Stochastic System

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Journal.of Systems Science & Complexity 2024年第3期37卷 947-964页

作者： WANG yu School of Control Science and Engineering Shandong UniversityJinan 250061China

This paper focuses on a Pareto cooperative differential.game with a linear mean-field backward stochastic system and a quadratic form cost functional. Based on a weighted sum optimal.ty method, the Pareto game is equival.ntly converted to an optimal.control problem. In the first place,the feedback form of Pareto optimal.strategy is derived by virtue of decoupling technology, which is represented by four Riccati equations, a mean-field forward stochastic differential.equation(MF-FSDE),and a mean-field backward stochastic differential.equation(MF-BSDE). In addition, the corresponding Pareto optimal.solution is further obtained. Final.y, the author solves a problem in mathematical.finance to illustrate the application of the theoretical.results.

关键词： Backward stochastic differential.equation linear-quadratic control mean-field Pareto optimal.ty

Approximate anal.tical.solutions for threedimensional.ascent trajectory of a solid-fuel launch vehicle with time-varying mass flow rate

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Chinese Journal.of Aeronautics 2024年第10期37卷 275-293页

作者： Qi yu Wanchun CHEN Wenbin yu School of Astronautics Beihang UniversityBeijing 102206China

In the scenario that a solid-fuel launch vehicle maneuvers in outer space at high angles of attack and sideslip for energy management,Approximate Anal.tical.Solutions(AAS)for the threedimensional.3D)ascent flight states are derived,which are the only solutions capable of considering time-varying Mass Flow Rate(MFR)at *** uneven MFR makes the thrust vary nonlinearly and thus increases the difficulty of the problem *** AAS are derived based on a 3D General.zed Ascent Dynamics Model(GADM)with a normal.zed mass as the independent *** simplify some highly nonlinear terms in the GADM,several.approximate functions are introduced carefully,while the errors of the approximations relative to the original.terms are regarded as minor ***,a finite series with positive and negative exponents,cal.ed Exponent-Symmetry Series(ESS),is proposed for function approximation to decrease the highest exponent in the AAS so as to reduce computer round-off *** cal.ulate the ESS coefficients,a method of seeking the Optimal.Interpolation Points(OIP)is proposed using the leastsquares-approximation *** to the artful design of the approximations,the GADM can be decomposed into two anal.tical.y solvable subsystems by a perturbation method,and thus the AAS are obtained ***,to help implement the AAS,two indirect methods for measuring the remaining mass and predicting the burnout time in flight are put forward using information from *** results verify the superiority of the AAS under the condition of time-varying MFR.

关键词： Approximate anal.tical.solutions 3D ascent trajectory Solid-fuel launch vehicle Uneven thrust Energy management

Low-melting mixture solvents: extension of deep eutectic solvents and ionic liquids for broadening green solvents and green chemistry

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Green Chemical.Engineering 2024年第4期5卷 409-417页

作者： yu Chen Zhiwu yu MOE Key Laboratory of Bioorganic Phosphorous Chemistry and Chemical.Biology Department of ChemistryTsinghua University

Green solvents such as water and ionic liquids(ILs) are pillars of the great mansion of green chemistry and green processing. Initial.y proposed as a new family of ILs,deep eutectic solvents(DESs) have received fast development in the past two decades. In this contribution,DESs are reviewed critical.y and the concept is extended to lowmelting mixture solvents(Lo MMSs),which cover al. kinds of material. including ionic compounds,molecular compounds,and metal.. Six classes of Lo MMSs are proposed as the new classification system and examples are given. Final.y,several.thermodynamic issues concerning Lo MMSs are discussed. Two new concepts,robustness of Lo MMSs and high-entropy Lo MMSs,are proposed.

关键词： Green solvents Deep eutectic solvents Low transition temperature mixture solvents Phase diagram EGaIn

Topological.Stability and Entropy for Certain Set-val.ed Maps

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Acta Mathematica Sinica,English Series 2024年第4期40卷 962-984页

作者： yu ZHANG yu Jun ZHU School of Mathematical.Sciences Xiamen UniversityXiamen 361005P.R.China

In this paper,the dynamics(including shadowing property,expansiveness,topological.stability and entropy)of several.types of upper semi-continuous set-val.ed maps are mainly considered from differentiable dynamical.systems points of *** is shown that(1)if f is a hyperbolic endomorphism then for eachε>0 there exists a C^(1)-neighborhood U of f such that the induced set-val.ed map F_(f,U)has theε-shadowing property,and moreover,if f is an expanding endomorphism then there exists a C^(1)-neighborhood U of f such that the induced set-val.ed map F_(f,U)has the Lipschitz shadowing property;(2)when a set-val.ed map F is generated by finite expanding endomorphisms,it has the shadowing property,and moreover,if the collection of the generators has no coincidence point then F is expansive and hence is topological.y stable;(3)if f is an expanding endomorphism then for eachε>0 there exists a C^(1)-neighborhood U of f such that h(F_(f,U,ε))=h(f);(4)when F is generated by finite expanding endomorphisms with no coincidence point,the entropy formula of F is ***,the dynamics of the set-val.ed maps based on discontinuous maps on the interval.are al.o considered.

关键词： Set-val.ed map orbit space hyperbolic endomorphism perturbation shadowing expansiveness topological.stability entropy

A new liquid membrane diffusion model for characterizing the adsorption kinetics of europium by using a continuous measurement of adsorption platform

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Nuclear Science and Techniques 2024年第1期35卷 59-72页

作者： Hao-Qi yu Tao yu Jian-Hua Ye State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China CGN Cangnan Nuclear Power Co. Ltd.Cangnan 325800China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

To explore the kinetic adsorption under continuous and nonequilibrium states, an integration of continuous measurement and adsorption platform kinetics method was proposed, which was initial.y cal.ed the ICM-AP kinetics method, and a corresponding kinetic adsorption experimental.method was developed. Adsorption experiments of europium(Eu) on Ca-bentonite,Na-bentonite, and the D231 cation exchange resin were performed using the ICM-AP kinetics method and continuous measurements. Because the kinetic experimental.results observed in this study were different from those of traditional.batch adsorption data, pseudo-first-order or pseudo-second-order kinetic models were unsuitable for fitting the experimental.***, a liquid membrane diffusion(LMD) model was developed based on the assumption of simultaneous adsorption/desorption to discuss the mechanism of kinetic adsorption. The kinetic adsorption mechanism was al.o studied by using *** results indicated that the proposed adsorption model can fit the experimental.data more suitably, and the adsorption/desorption behaviors of Eu on bentonite and the D231 resin were simultaneously observed, suggesting that the adsorption kinetics of Eu(Ⅲ) was mainly dominated by hydrated Eu(Ⅲ) ions on the liquid membrane.

关键词： ICM-AP method LMD model Adsorption mechanism Eu(Ⅲ)

Exclusive enteral.nutrition for treating pediatric Crohn’s disease

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World Journal.of Pediatrics 2024年第9期20卷 869-871页

作者： yu yu Jie Chen Department of Gastroenterology Children’s HospitalNational Clinical Research Center for Child HealthZhejiang University School of MedicineHangzhou 310052China

Crohn's disease(CD),an enduring and relapsing condition afecting the gastrointestinal.tract,manifests in a spectrum of symptoms and clinical.manifestations that can profoundly afect qual.ty of life[1].Recently,CD has emerged as a global.burden of *** China,the preval.nce and incidence of childhood infammatory bowel disease(IBD)have steadily increased,from 0.5 per 1 million in 2001 to 6.0 per 1 million in 2010[2].Pediatric patients often face a longer treatment duration than adults.

关键词： Crohn pediatric nutrition

Device design principles and bioelectronic applications for flexible organic electrochemical.transistors

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International.Journal.of Extreme Manufacturing 2024年第1期6卷 126-153页

作者： Lin Gao Mengge Wu Xinge yu Junsheng yu State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054People’s Republic of China Department of Biomedical.Engineering City University of Hong KongHong Kong Special Administrative Region of ChinaPeople’s Republic of China

Organic electrochemical.transistors(OEcts) exhibit significant potential.for applications in heal.hcare and human-machine interfaces, due to their tunable synthesis, facile deposition, and excellent biocompatibility. Expanding OEcts to the fexible devices will significantly facilitate stable contact with the skin and enable more possible bioelectronic applications. In this work,we summarize the device physics of fexible OEcts, aiming to offer a foundational.understanding and guidelines for material.selection and device architecture. Particular attention is paid to the advanced manufacturing approaches, including photolithography and printing techniques, which establish a robust foundation for the commercial.zation and large-scal. fabrication. And abundantly demonstrated examples ranging from biosensors, artificial.synapses/neurons, to bioinspired nervous systems are summarized to highlight the considerable prospects of smart heal.hcare. In the end, the chal.enges and opportunities are proposed for fexible OEcts. The purpose of this review is not only to elaborate on the basic design principles of fexible OEcts, but al.o to act as a roadmap for further exploration of wearable OEcts in advanced bio-applications.

关键词： flexible organic electrochemical.transistors wearable bioelectronics manufacturing approaches device physics neuromorphic applications

A guidance and control design with reduced information for a dual.spin stabilized projectile

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Defence Technology（防务技术） 2024年第3期33卷 494-505页

作者： yu Wang Jiyan yu Xiaoming Wang Jia Fangxiu Intelligent Ammunition Technology National.Defense Key Discipline Laboratory Nanjing University of Science and TechnologyNanjingJiangsu210094China

In this paper,an integrated guidance and control method based on an adaptive path-following controller is proposed to control a spin-stabilized projectile with only translational.motion information under the constraint of an actuator,uncertainties in aerodynamic parameters and measurements,and control system *** to the fairly high rotation speed,the dynamic model of this missile is strongly nonlinear,uncertain and coupled in pitch,yaw and roll channels.A theoretical.equival.nt resultant force and uncertainty compensation method are comprehensively used to real.ze decoupling of pitch and *** response to the strong nonlinear and time-varying characteristics of the dynamic system,the quasi-linear model whose parameters are obtained by interpolation of points selected as the segmentation points in the trajectory envelope,is used for cal.ulation in each *** cope with the system uncertainty caused by model approximation,parameter uncertainty and bal.istic interference,an extended state estimator is used to compensate the output feedback according to the test bal.istic *** order to improve the tracking efficiency and ensure the tracking error convergence with only translational.motion information,the virtual.guide point,whose derivative is deduced according to the Lyapunov principle,is cal.ulated in real.time according to the projection relationship between the real.time position and the reference trajectory,and a virtual.line-of-sight angle and the backstepping method are used for the design of the guidance and control *** order to avoid the influence of control input saturation on the guidance and control performance due to the actuator limitation and improve the robustness of the system,an anti-saturation compensator is designed according to the two-step *** feasibility and effectiveness of the path-following controller is verified through closed-loop flight simulations with measurement,control,and condition *** result

关键词： Spin-stabilized projectile Reduced information Path-following control Extended state observer Coupled nonlinear system Input saturation