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Beyond the lab:a nanoimprint metalens arraybased augmented reality

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Light(Science & Applications) 2024年第5期13卷 801-802页

作者： Chi Li haoran Ren School of Physics and Astronomy Monash UniversityMelbourneVICAustralia

A see-through augmented reality prototype has been developed based on an ultrathin nanoimprint metalens array,opening up a full-colour,video-rate,and low.cost 3D near-eye display.

关键词： cost ens imprint

Tailoring the Properties of Polyhydroxyalkanoates from Plastics to Elastomers via Stereoselective Copolymerizations of rac-β-Butyrolactone and β-Propiolactone

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Chinese Journal of Chemistry 2024年第9期42卷 963-972页

作者： haoran Zhang JiaojiaoQin Xiaoyan Tang Beijing National Laboratoryfor Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCenterfor Soft Matter Science and EngineeringCollegeof Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Poly(3-hydroxybutyrate),a crucial member of the large biodegradable polyhydroxyalkanoate family,suffers from its *** enhance its performance,w. employed a straightforw.rd approach involving the ring-opening copolymerization of racemic-β-butyrolactone(rac-β-BL)andβ-propiolactone(β-PL)using the syndio-selective amino-alkoxy-bis(phenolate)-yttrium complex as a catalyst,thanks to the excellent ductility of poly(3-hydroxypropionate).Control over the rac-β-BL/β-PL feeding ratios and polymerization time yielded random or block copolymers w.th tunable thermal and mechanical properties comparable to traditional fossil-based ***,w. achieved one-pot synthesis of hard-soft-hard triblock copolymers by exploiting monomers’different copolymerization rates and a bifunctional initiator,thus transforming polyhydroxyalkanoates from hard and tough plastics to soft and ductile thermoplastic elastomers.

关键词： Ring-opening(co-)polymerization Biodegradable polymers Polyhydroxyalkanoates Copolymers Plastics Elastomers

Preparing lipid nanoparticles w.th tunable drug loading capacity and morphology via improved sequential nanoprecipitation

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Science China Chemistry 2024年第5期67卷 1373-1374页

作者： haoran w.ng Ben Zhong Tang Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction Department of Chemistry.Institute of Molecular Functional MaterialsState Key Laboratory of NeuroscienceDivision of Biomedical Engineering and Division of Life ScienceThe Hong Kong University of Science and TechnologyHong Kong 999077China School of Science and Engineering Shenzhen Institute of Aggregate Science and Technology The Chinese University of Hong KongShenzhen(CUHK-Shenzhen)Shenzhen 518172China

Nanotechnology hailed as a revolutionary new.technology of the 21st century, has ignited a w.ve of innovation across diverse fields spanning chemistry, physics, materials science,medicine, engineering, and electronics. In 2016, Nature published an article titled “The nanolight revolution is coming”, underscoring that “virus-sized particles that emit light in every color could transform applications ranging from television displays to cancer treatment”.

关键词： sized loading treatment

Mega-Constellations Based TT&C Resource Sharing: Keep Reliable Aeronautical Communication in an Emergency

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China Communications 2024年第2期21卷 1-16页

作者： haoran Xie Yafeng Zhan Jianhua Lu Department of Electronic Engineering Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China

w.th the development of the transportation industry, the effective guidance of aircraft in an emergency to prevent catastrophic accidents remains one of the top safety concerns. Undoubtedly, operational status data of the aircraft play an important role in the judgment and command of the Operational Control Center(OCC). How.ver, how.to transmit various operational status data from abnormal aircraft back to the OCC in an emergency is still an open problem. In this paper, w. propose a novel Telemetry, Tracking,and Command(TT&C) architecture named Collaborative TT&C(CoTT&C) based on mega-constellation to solve such a problem. CoTT&C allow. each satellite to help the abnormal aircraft by sharing TT&C resources w.en needed, realizing real-time and reliable aeronautical communication in an emergency. Specifically, w. design a dynamic resource sharing mechanism for CoTT&C and model the mechanism as a single-leader-multi-follow.r Stackelberg game. Further, w. give an unique Nash Equilibrium(NE) of the game as a closed form. Simulation results demonstrate that the proposed resource sharing mechanism is effective, incentive compatible, fair, and reciprocal. w. hope that our findings can shed some light for future research on aeronautical communications in an emergency.

关键词： aeronautical emergency communication mega-constellation netw.rked TT&C resource allocation stackelberg game

Resilience assessment and optimization method of city road netw.rk in the post-earthquake emergency period

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Earthquake Engineering and Engineering Vibration 2024年第3期23卷 765-779页

作者： w.ng haoran Xiao Jia Li Shuang Zhai Changhai Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information TechnologyHarbin Institute of TechnologyHarbin 150090China

The post-earthquake emergency period,w.ich is a sensitive time segment just after an event,mainly focuses on saving life and restoring social *** improve the seismic resilience of city road netw.rks,a resilience evaluation method used in the post-earthquake emergency period is *** road seismic damage index of a city road netw.rk can consider the influence of roads,bridges and buildings along the roads,*** road capacity after an earthquake.A function index for a city road netw.rk is developed,w.ich reflects the connectivity,redundancy,traffic demand and traffic function of the *** optimization model for improving the road repair order in the post-earthquake emergency period is also developed according to the resilience evaluation,to enable decision support for city emergency management and achieve the best seismic resilience of the city road *** optimization model is applied to a city road netw.rk and the results illustrate the feasibility of the resilience evaluation and optimization method for a city road netw.rk in the post-earthquake emergency period.

关键词： city road netw.rk post-earthquake emergency period traffic demand resilience evaluation optimization model

Prediction and Regulation of Delamination at Flexible Film/Finite-Thickness-Substrate Structure Interfaces

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Acta Mechanica Solida Sinica 2024年第2期37卷 238-251页

作者： Yutang Zhou Yunlong Xu haoran Gong Chenyu w.ng Department of Engineering Mechanics Northwestern Polytechnical UniversityXi’an710072China School of Instrumentation Science and Opto-Electronics Engineering Beihang UniversityBeijing100191China

Regulating the surface instability of thin film/substrate structures has been successfully applied to prepare new.ductile electronic ***,such electronic devices need to be subjected to external loads during operation,w.ich can easily induce delamination of the thin-film electronic device from the *** study aims to investigate the instability characteristics of hard films on flexible substrate surfaces from theoretical analysis and numerical simulation *** finite-thickness substrates,this paper establishes theoretical models for pure bending,bent w.inkle,partial delamination,and total delamination buckling of film/substrate structures based on the nonlinear Euler–Bernoulli beam theory and the principle of minimum energy;then the effects of material and geometric parameters of the structure,interfacial adhesion strength,and pre-strain on the evolutionary path of the four patterns are *** study results show.that:the greater Young’s modulus of the substrate is,the larger the parameter region w.ere partial delamination of the film/substrate structure occurs,and the smaller the parameter region w.ere bent w.inkle *** varying Young’s modulus,thickness of the film and substrate,interfacial adhesion coefficient,and pre-strain,the buckling pattern of the structure can be predicted and *** parametric design intervals for each pattern are summarized in the phase *** results of this paper provide theoretical support for the design and reliability evaluation of flexible electronic devices.

关键词： Thin film/finite-thickness-substrate structure Delamination Surface instability Pattern evolution

TSCND:Temporal Subsequence-Based Convolutional Netw.rk w.th Difference for Time Series Forecasting

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Computers, Materials & Continua 2024年第3期78卷 3665-3681页

作者： haoran Huang w.iting Chen Zheming Fan MOE Research Center of Softw.re/Hardw.re Co-Design Engineering East China Normal UniversityShanghai200062China

Time series forecasting plays an important role in various fields, such as energy, finance, transport, and w.ather. Temporal convolutional netw.rks (TCNs) based on dilated causal convolution have been w.dely used in time series forecasting. How.ver, tw. problems w.aken the performance of TCNs. One is that in dilated casual convolution, causal convolution leads to the receptive fields of outputs being concentrated in the earlier part of the input sequence, w.ereas the recent input information w.ll be severely lost. The other is that the distribution shift problem in time series has not been adequately solved. To address the first problem, w. propose a subsequence-based dilated convolution method (SDC). By using multiple convolutional filters to convolve elements of neighboring subsequences, the method extracts temporal features from a grow.ng receptive field via a grow.ng subsequence rather than a single element. Ultimately, the receptive field of each output element can cover the w.ole input sequence. To address the second problem, w. propose a difference and compensation method (DCM). The method reduces the discrepancies betw.en and w.thin the input sequences by difference operations and then compensates the outputs for the information lost due to difference operations. Based on SDC and DCM, w. further construct a temporal subsequence-based convolutional netw.rk w.th difference (TSCND) for time series forecasting. The experimental results show.that TSCND can reduce prediction mean squared error by 7.3% and save runtime, compared w.th state-of-the-art models and vanilla TCN.

关键词： Difference data prediction time series temporal convolutional netw.rk dilated convolution

Artificial rabbit optimization algorithm based on chaotic mapping and Levy flight improvement

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The Journal of China Universities of Posts and Telecommunications 2024年第4期31卷 54-69页

作者： w. Jin Su Zhengdong Gao Yaqiong Feng haoran School of Electronic Engineering Xi’an University of Posts and TelecommunicationsXi’an 710121China

An artificial rabbit optimization(ARO)algorithm based on chaotic mapping and Levy flight improvement is proposed,w.ich has the advantages of good initial population quality and fast convergence compared w.th the traditional ARO algorithm,called *** is improved by applying three *** mapping is introduced,w.ich can optimize the quality of the initial population of the *** Levy flight in the exploration phase,w.ich can avoid the algorithm from falling into a local *** threshold of the energy factor is optimized,w.ich can better balance exploration and *** efficiency of CLARO is tested on a set of 23 benchmark function sets by comparing it w.th ARO and different meta-heuristics *** last,the comparison experiments conclude that all three improvement strategies enhance the performance of ARO to some extent,w.th Levy flight providing the most significant improvement in ARO *** experimental results show.that CLARO has better results and faster convergence compared to other algorithms,w.ile successfully addressing the draw.acks of ARO and being able to face more challenging problems.

关键词： CLARO chaotic mapping Levy flight convergence

Forw.rd indifference valuation for dynamically incoming projects

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Probability, Uncertainty and Quantitative Risk 2024年第2期9卷 219-234页

作者： haoran w.ng 444 w.rren Street Jersey CityNew Jersey07302USA

Classical indifference valuation,a w.dely studied approach in incomplete markets,uses critically the a priori know.edge of the characteristics(arrival,maturity,payoff structure)of the projects in *** assumption,how.ver,may not accommodate realistic scenarios in w.ich projects,not initially anticipated,arrive at later *** accommodate this,w. employ forw.rd indifference valuation criteria,w.ich by construction are flexible enough to adapt to such"non-anticipated"cases w.ile yielding time-consistent indifference *** consider and analyze in detail tw. representative cases:valuation adjustments due to incoming non-anticipated project and the relative forw.rd indifference valuation of new.projects in relation to existing ones.

关键词： Forw.rd indifference valuation Dynamically incoming projects Indifference pricing Relative forw.rd indifference valuation Predictable forw.rd criteria Adaptive forw.rd criteria Risk decomposition