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Dynamics of self-hybridized exciton–polaritons in 2D halide perovskites

Light(Science & Applications) 2024年第1期13卷 13-22页

作者： Surendra B.Anantharaman Jason Lynch Christopher E.Stevens Christopher Munley Chentao Li Jin Hou Hao Zhang Andrew Torma Thomas Darlington Francis Coen Kevin Li Arka Majumdar PJames Schuck Aditya Mohite Hayk Harutyunyan Joshua R.Hendrickson Deep Jariwala Department of Electrical and Systems Engineering University of PennsylvaniaPhiladelphiaPA19104USA KBR Inc. BeavercreekOH45431USA Air Force Research Laboratory Sensors DirectorateWright-Patterson Air Force BaseOH45433USA Department of Physics University of WashingtonSeattleWA98195USA Department of Physics Emory UniversityAtlantaGA30322USA Department of Chemical and Biomolecular Engineering Rice UniversityHoustonTX77005USA Department of Materials Science and Nanoengineering Rice UniversityHoustonTX77005USA Applied Physics Program Smalley‐Curl InstituteRice UniversityHoustonTX77005USA Department of Mechanical Engineering Columbia UniversityNew YorkNY10027USA Department of Electrical and Computer Engineering University of WashingtonSeattleWA98195USA

Excitons,bound electron–hole pairs,in two-dimensional hybrid organic inorganic perovskites(2D HOIPs)are capable of forming hybrid light-matter states known as exciton-polaritons(E–Ps)when the excitonic medium is confined in an optical *** the case of 2D HOIPs,they can self-hybridize into E–Ps at specific thicknesses of the HOIP crystals that form a resonant optical cavity with the ***,the fundamental properties of these self-hybridized E–Ps in 2D HOIPs,including their role in ultrafast energy and/or charge transfer at interfaces,remain ***,we demonstrate that>0.5µm thick 2D HOIP crystals on Au substrates are capable of supporting multiple-orders of self-hybridized E–P *** E–Ps have high Q factors(>100)and modulate the optical dispersion for the crystal to enhance sub-gap absorption and *** varying excitation energy and ultrafast measurements,we also confirm energy transfer from higher energy E–Ps to lower energy E–***,we also demonstrate that E–Ps are capable of charge transport and transfer at *** findings provide new insights into charge and energy transfer in E–Ps opening new opportunities towards their manipulation for polaritonic devices.

关键词： charge polar excitation

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A chaotic firefly algorithm applied to reliability-redundancy optimization

A chaotic firefly algorithm applied to reliability-redundanc...

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Congress on Evolutionary Computation

作者： Leandro dos Santos Coelho Diego Luís de Andrade Bernert Viviana Cocco Mariani Industrial and Systems Engineering Graduate Program PPGEPS Pontifical Catholic University of Paraná Curitiba Parana Brazil Department of Mechanical Engineering PPGEPS Pontifical Catholic University of Paraná Curitiba Parana Brazil

The reliability-redundancy allocation problem can be approached as a mixed-integer programming problem. It has been solved by using optimization techniques such as dynamic programming, integer programming, and mixed-integer non linear programming. On the other hand, a broad class of meta heuristics has been developed for reliability-redundancy optimization. Recently, a new meta-heuristics called firefly algorithm (FA) algorithm has emerged. The FA is a stochastic metaheuristic approach based on the idealized behavior of the flashing characteristics of fireflies. In FA, the flashing light can be formulated in such a way that it is associated with the objective function to be optimized, which makes it possible to formulate the firefly algorithm. This paper introduces a modified FA approach combined with chaotic sequences (FAC) applied to reliability-redundancy optimization. In this context, an example of mixed integer programming in reliability-redundancy design of an overspeed protection system for a gas turbine is evaluated. In this application domain, FAC was found to outperform the previously best-known solutions available.

关键词： Fires Optimization Chaos Algorithm design and analysis Benchmark testing Redundancy

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Redesigning a college-wide multidisciplinary engineering design program at RIT

Redesigning a college-wide multidisciplinary engineering des...

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114th Annual ASEE Conference and Exposition, 2007

作者： Walter, Wayne Webb, Jeffrey Smith, Mark DeBartolo, Elizabeth Bailey, Margaret Slack, George Rochester Institute of Technology United States Department of Mechanical Engineering RIT United States Engineering Modeling and Simulations Group Southeast Division of Applied Research Associates Programs Rochester Institute of Technology United States United States Engineering Honors Program United States Multidisciplinary Capstone Design Leadership Team United States Senior Design and Digital Systems United States Xerox Corp Bosch Corp. United States

Since 2002, the Kate Gleason College of engineering (KGCOE) at the Rochester Institute of Technology (RIT) has seen its Multidisciplinary Senior Design (MSD) program grow from a small pilot project into a college-wide initiative, involving four departments and almost 400 students annually. While subtle adjustments have been made each year, a major redesign effort was undertaken prior to the 2006 academic year to improve program alignment with departmental objectives, to improve delivery efficiency and effectiveness, and to improve student and faculty satisfaction. The project definition process was overhauled to focus on the definition of related projects within a set of disciplinary "tracks," consistent with academic programs and faculty interests. Emphasis was placed on development of reusable and scalable platforms to lay the foundation for future project extensions, and to encourage cross-project and cross-department collaboration. To reduce startup time normally associated with student projects, day-long workshops were developed for the first four weeks that forced intense focus on customer requirements, engineering specifications, and concept development and selection. The workshop structure and format further encouraged collaboration within and across teams. Lastly, a Wiki-based online environment was created to support knowledge capture and emergent collaboration. This paper provides an overview of changes to the MSD program in three key areas: course delivery, project definition, and communications infrastructure. Attention is given to innovative approaches to challenges inherent in serving a large and diverse constituency with limited resources. © American Society for engineering Education, 2007.

关键词： Curricula

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A normative differential evolution approach for estimation of heat transfer coefficient during freezing treatment by inverse analysis

A normative differential evolution approach for estimation o...

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Congress on Evolutionary Computation

作者： Viviana Cocco Mariani Carlos Eduardo Klein Luiz Guilherme Justi Luvizotto Leandro dos Santos Coelho Department of Mechanical Engineering PPGEM Pontifical Catholic University of Paraná Curitiba Parana Brazil Industrial and Systems Engineering Graduate Program PPGEPS Pontifical Catholic University of Paraná Curitiba Parana Brazil

Among the existing meta-heuristic optimization algorithms, a well-known branch is the differential evolution (DE). DE is a powerful population-based algorithm of evolutionary computation field designed for solving global optimization problems which only has a few control parameters. With an eye to improve the performance of DE, in this paper, a DE approach combined with a cultural algorithm technique based on normative knowledge (NDE) is investigated to estimate the heat transfer coefficient during freezing treatment by inverse analysis. Numerical results for inverse heat transfer problem demonstrate the applicability and efficiency of the NDE algorithm. In this application, NDE approach outperforms a classical DE approach in terms of quality of solution.

关键词： Heat transfer Optimization Temperature measurement Cultural differences Algorithm design and analysis Evolutionary computation Temperature

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Optimising phase change materials for ventilated building components in sustainable building design: a comprehensive review

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Energy and Buildings 2025年

作者： Farhan Lafta Rashid Mudhar A. Al-Obaidi Wadhah Amer Hatem Najah M.L. Al Maimuri Arman Ameen Shabbir Ahmad Ephraim Bonah Agyekum Saif Ali Kadhim Karrar A. Hammoodi Petroleum Engineering Department College of Engineering University of Kerbala Karbala 56001 Iraq Technical Instructor Training Institute Middle Technical University Baghdad 10074 Iraq Middle Technical University Technical Institute of Baquba Baquba Diyala 32001 Iraq Building and Construction Techniques Engineering Department College of Engineering and Engineering Techniques Al-Mustaqbal University Hillah Babylon 51001 Iraq Department of Building Engineering Energy Systems and Sustainability Science University of Gävle 801 76 Gävle Sweden Graduate Program of Ocean Engineering School of Engineering Universidade Federal do Rio Grande Rio Grande Italia Avenue km 8 96201-900 Brazil Institute of Geophysics and Geomatics China University of Geosciences Wuhan 430074 China Department of Nuclear and Renewable Energy Ural Federal University Named after the First President of Russia Boris Yeltsin 19 Mira Street Ekaterinburg 620002 Russia Western Caspian University 31 Istiglaliyyat Street AZ1001 Baku Azerbaijan Istanbul Okan University Tuzla Campus 34959 Tuzla Istanbul Turkey Mechanical Engineering Department University of Technology – Iraq Baghdad Iraq College of Engineering University of Al Maarif Al Anbar Iraq

The rise in energy-efficient, sustainable building operations necessitates the development of advanced innovations that reduce heating and cooling demands while maintaining comfortable indoor thermal conditions. Phase change materials (PCMs) demonstrate significant potential as a stabilization mechanism through latent heat storage for managing residential indoor temperatures; however, their integration into systems requires further optimisation. This review examines PCM-assisted ventilation technologies—specifically ventilated façades, roofs, and windows—highlighting their energy performance, which ranges from 7.7 % to 32.8 %, and their capacity to reduce peak temperatures by 2.5 °C to 7.02 °C. These improvements are influenced by PCM thickness of 15–35  mm and melting temperatures of 15–37 °C. The combination of PCM-enhanced hybrid systems with natural or mechanical ventilation has shown greater operational effectiveness, particularly in hot climates and when integrated with adaptive control systems to achieve optimal performance. Despite their benefits, widespread adoption of PCM technologies is hindered by high material costs, hysteresis effects, and limited discharge cycle efficiency. Nevertheless, PCM-enhanced ventilation systems have proven capable of supporting sustainable, low-energy buildings. Continued research is needed to develop cost-effective design strategies, automated control mechanisms, and climate-responsive optimisations to fully realize their potential.

关键词： Energy-efficient ventilation systems Phase change materials (PCMs) Residential buildings Sustainable thermal management

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Improvement of product strength and press formability of Al-Mg-Si alloy sheets by resistance heat treatment and artificial aging

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Keikinzoku/Journal of Japan Institute of Light Metals 2006年第6期56卷 313-316页

作者： Ishiguro, Minoru Maki, Seijiro Mori, Ken-Ichiro Doctoral Program of Mechanical and Structural System Engineering Toyohashi University of Technology 1-1 Hibarigaoka Tempaku-cho Toyohashi-shi Aichi 441-8580 Department of Production Systems Engineering Toyohashi University of Technology Toyohashi-shi Aichi

A treatment consisting of resistance heat treatment and artificial aging was developed to improve the product strength and press formability of Al-Mg-Si alloy sheets having paint bake hardenability used for automobile body panels. In this treatment, the sheets are re-solution heat-treated by resistance heating and water quenching just before the press forming. The formed sheets are artificially aged just after the press forming to increase the product strength. In the experiment, Al-0.60%Si-0.74%Mg (A6061) alloy sheets were chosen. The solution heat treatment of the sheets was sufficiently accomplished by the rapid resistance heat treatment, and the press formability of the sheets was improved. The hardness of formed products is increased by the artificial aging and paint bake hardening. It was found that the present heat treatment is effective in improving the product strength and press formability of the Al-Mg-Si alloy sheets having the paint bake hardenability.

关键词： Aluminum alloys

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Wavelet neural network approach applied to biomechanics of swimming

Wavelet neural network approach applied to biomechanics of s...

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UK Workshop on Computational Intelligence (UKCI)

作者： Weslly Puchalski Viviana Cocco Mariani Felipe Fidelis Schauenburg Leandro dos Santos Coelho Industrial and Systems Engineering Graduate Program PPGEPS Pontifical Catholic University of Parana Curitiba Brazil Department of Mechanical Engineering University of Parana Curitiba Brazil Department of Electrical Engineering Federal University of Parana Curitiba Brazil

An artificial neural network (ANN) consists of a number of interconnecting artificial neurons and employs mathematical or computational models for information processing. ANNs are suitable for handling large amounts of dynamic, noisy and nonlinear data. On the other hand, the wavelet theory provides a multi-resolution approximation for discriminate functions. The combination of the wavelet transforms theory with the basic concept of ANNs leads to new mapping networks called wavelet neural networks (WNNs) or wavenets, which are proposed as an alternative to feedforward ANNs for approximating arbitrary nonlinear functions. Generalized from radial basis function ANNs, WNNs are in fact feed-forward neural networks with one hidden layer, radial wavelets as activation functions in the hidden nodes and a linear output layer. The contribution of this paper is to evaluate the WNNs to model a parathlete swimmer behavior. The parathlete swimmer swims the breaststroke style using biomechanics data generated by the software tool called SWUMSUIT, which was developed in Tokyo Technological Institute in Japan. The forecasted results clearly show that WNN has good prediction properties. The proposed WNN modeling approach can benefit disabled swimmers (parathletes) to gain competitive advantage by studying the biomechanics involved in the sport and considering the help of simulations systems.

关键词： Wavelet transforms Biomechanics Mathematical model Modeling Biological system modeling Force Artificial neural networks

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Steering Control for Autonomous Vehicles Using PID Control with Gradient Descent Tuning and Behavioral Cloning

Steering Control for Autonomous Vehicles Using PID Control w...

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Novel Intelligent and Leading Emerging Sciences Conference (NILES)

作者： Mohamed Esmail Abed Mo'men Aly Hossam Hassan Ammar Raafat Shalaby Mechanical Engineering Program School of Engineering and applied sciences Nile University Shaikh Zayed City Egypt Smart Engineering Systems Research Center (SESC) School of Engineering and Applied Science Nile University Shaikh Zayed City Egypt

ISBN: (数字)9781728182261

ISBN: (纸本)9781728182278

In this paper we implement and evaluate two ways of controlling the steering angle of an autonomous vehicle, PID control with manual tuning followed by gradient descent algorithm tuning-which is able to enhance the performance through self-adjusting the controller parameters-and using supervised machine learning through the end-to-end deep learning for self-driving car which implement Convolutional Neural Network (CNN) to predict the steering angle for a given instance of a track. The verification testing went through two phases: software simulation using python for first run testing and C++ for simulation followed by track testing with a vehicle prototype. The proposed PID steering control system exhibits more stable steering commands-less oscillations-which makes it better than CNN Behavioral cloning control model. However, CNN Behavioral Cloning model may show better results after many several hours of training.

关键词： Automobiles Tuning Training Cameras Testing Mathematical model Wheels

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Effect of Overload and Underload on Subsequent Deformation Behavior during Cyclic Deformation

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Zairyo/Journal of the Society of Materials Science, Japan 2022年第2期71卷 159-166页

作者： Kondou, Ryouji Yama, Katsunari Energy and Environmental Program School of Engineering Faculty of Engineering University of the Ryukyus Nishihara-cho Nakagami-gun Okinawa903-0213 Japan Department of Mechanical Systems Engineering Graduate School of Engineering and Science University of the Ryukyus Nishihara-cho Nakagami-gun Okinawa903-0213 Japan

A multi-scale analysis of elasto-plastic deformation and dislocation movement and accumulation of tricrystalline models during cyclic deformation was performed. The accumulation of dislocations in geometrically necessary dislocations (GNDs) and statistically stored dislocations (SSDs) was investigated in detail. Experimental observations have shown that fatigue life and fatigue crack propagation are also deteriorated when the material is subjected to overload or underload. However, in the microscopic and mesoscopic regions, where the effects of the crack tip shape change are not related to the size of the crack tip, a different phenomenon is essentially occurring. In this paper, the effects of overload and underload are investigated using a simple model without a crack. From the analysis results, it was found that the dislocation structure generated in the material subjected to overload or underload affects the subsequent deformation behavior. However, even though the absolute values are the same, the effects of overloading and underloading on the subsequent deformation are different, and underloading increases the non-uniformity of the subsequent deformation, which is on the dangerous side, while overloading decreases with increasing the number of repetitions. ©2022 The Society of Materials Science, Japan

关键词： Crack tips

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Single-input control of multiple fluid-driven elastic actuators via interaction between bi-stability and viscosity

arXiv

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arXiv 2019年

作者： Ben-Haim, Eran Salem, Lior Or, Yizhar Gat, Amir D. Faculty of Mechanical Engineering Technion - Israel Institute of Technology Haifa32000 Israel Technion Autonomous Systems Program Technion - Israel Institute of Technology Haifa3200003 Israel

A leading concept in soft robotics actuation, as well as in microfluidics applications such as valves in lab-on-a-chip devices, is applying pressurized flow in cavities embedded within elastic bodies. Generating complex deformation patterns typically requires control of several inputs, which greatly complicates the system’s operation. In this work, we present a novel method for single-input control of a serial chain of bi-stable elastic chambers connected by thin tubes. Controlling a single flow rate at the chain’s inlet, we induce an irreversible sequence of transitions that can reach any desired state combination of all bi-stable elements. Mathematical formulation and analysis of the system’s dynamics reveal that these transitions are enabled thanks to bi-stability combined with pressure lag induced by viscous resistance. The results are demonstrated via numerical simulations combined with experiments for chains of up to 5 chambers, using water-diluted glycerol as the injected fluid. The proposed technique has a promising potential for development of sophisticated soft actuators with minimalistic control. Copyright © 2019, The Authors. All rights reserved.

关键词： Actuators

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