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International Conference on Electrical engineering and Informatics (ICon EEI)

作者： Nurhalim Dani Ali Syaiful Bahri Yusni Ikhwan Siregar Zulfan Saam Juandi Muhammad Suwondo Suwondo Iswadi Hasyim Rosma Postgraduate Program and Electrical Engineering Dept. Enviromental Science University of Riau Pekanbaru Indonesia Chemical Enginerring Dept. University of Riau Pekanbaru Indonesia Enviromental Sciences Dept. University of Riau Pekanbaru Indonesia Physics Science Dept. University of Riau Pekanbaru Indonesia Electrical Engineering Dept. University of Riau Pekanbaru Indonesia

ISBN: (数字)9798331540791

ISBN: (纸本)9798331540807

Solar photovoltaic (PV) systems are becoming the future type of power plant to meet the electrical energy needs of buildings. The open roof of the building facing the sky has the potential to harvest energy from solar energy. The roof of the Faculty of engineering Laboratory Building at Riau University has the potential to be used to capture solar energy. In this study, the research is focused on designing a comprehensive solar PV system that adapts to the geographical conditions of the campus. The data was calculated using software to design and analyze the rooftop PV system. Meteorological data was collected using an automatic weather station (AWS). The data measured through the AWS includes solar irradiation, temperature, humidity, and wind speed. The data is sampled once every 5 minutes, resulting in 12 data points per hour. The amount of data for one day is 12 multiplied by 24 hours. The total data for one month is obtained by multiplying the daily data by the number of days in the month. In details of this study, the PV panels were installed on the roof space of the Laboratory Building which is grid-connected. In addition, detailed technical analysis including effective roof area, roof orientation, number of panels and power capacity of the proposed PV were analyzed. As the result an effective roof area of 1,510.500 m2, the total number of panels of 656 pieces, the total power capacity of 229,600 Wp, and the total amount of energy generated by the module array of 160,545 kWh per year were achieved respectively. The energy delivered to the grid amounted to as much as 155,414 kWh per year. The specific energy generated was 677 kWh/KWp/year and the Performance Ratio (PR) reached 82%.

关键词： Temperature measurement Photovoltaic systems Electrical engineering Electric potential Wind speed Buildings Solar energy Software Inverters Solar radiation

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Ab initio phonon transport across grain boundaries in graphene using machine learning based on small dataset

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Physical Review Materials 2022年第4期6卷 044004-044004页

作者： Amirreza Hashemi Ruiqiang Guo Keivan Esfarjani Sangyeop Lee Computational Modeling and Simulation Program University of Pittsburgh Pittsburgh Pennsylvania 15261 USA Department of Mechanical Engineering and Materials Science University of Pittsburgh Pittsburgh Pennsylvania 15261 USA Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville Virginia 22904 USA Department of Materials Science and Engineering University of Virginia Charlottesville Virginia 22904 USA Department of Physics University of Virginia Charlottesville Virginia 22904 USA Department of Physics and Astronomy University of Pittsburgh Pittsburgh Pennsylvania 15261 USA

Establishing the structure-property relationship for grain boundaries (GBs) is critical for developing next-generation functional materials but has been severely hampered due to its extremely large configurational space. Atomistic simulations with low computational cost and high predictive power are strongly desirable, but the conventional simulations using empirical interatomic potentials and density functional theory suffer from the lack of predictive power and high computational cost, respectively. A machine learning interatomic potential (MLIP) recently emerged but often requires extensive size of the training dataset, making it a less feasible approach. Here, we demonstrate that an MLIP trained with a rationally designed small training dataset can predict thermal transport across GBs in graphene with ab initio accuracy at an affordable computational cost. We employed a rational approach based on the structural unit model to find a small set of GBs that can represent the entire configurational space and thus can serve as a cost-effective training dataset for the MLIP. Only 5 GBs were found to be enough to represent the entire configurational space of graphene GBs. Using the atomistic Green's function approach and the MLIP, we revealed that the structure-thermal resistance relation in graphene does not follow the common understanding that large dislocation density causes larger thermal resistance. In fact, thermal resistance is nearly independent of dislocation density at room temperature and is higher when the dislocation density is small at sub-room temperature. We explain this intriguing behavior with the buckling near a GB causing a strong scattering of flexural phonon modes. In this paper, we show that a machine learning technique combined with conventional wisdom (e.g., structural unit model) can extend the recent success of ab initio thermal transport simulation, which has been mostly limited to single crystals, to complex yet practically important polycry

关键词： Phonons Graphene Landauer formula Machine learning

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Chiral, Topological, and Knotted Colloids in Liquid Crystals

arXiv

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arXiv 2024年

作者： Yuan, Ye Smalyukh, Ivan I. Hiroshima University Hiroshima Higashi-Hiroshima739-8526 Japan Department of Physics Department of Electrical Computer and Energy Engineering Materials Science and Engineering Program Soft Materials Research Center University of Colorado BoulderCO80309 United States Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado BoulderCO80309 United States

The geometric shape, symmetry, and topology of colloidal particles often allow for controlling colloidal phase behavior and physical properties of these soft matter systems. In liquid crystalline dispersions, colloidal particles with low symmetry and nontrivial topology of surface confinement are of particular interest, including surfaces shaped as handlebodies, spirals, knots, multi-component links, and so on. These types of colloidal surfaces induce topologically nontrivial three-dimensional director field configurations and topological defects. Director switching by electric fields, laser tweezing of defects, and local photo-thermal melting of the liquid crystal host medium promote transformations among many stable and metastable particle-induced director configurations that can be revealed by means of direct label-free three-dimensional nonlinear optical imaging. The interplay between topologies of colloidal surfaces, director fields, and defects is found to show a number of unexpected features, such as knotting and linking of line defects, often uniquely arising from the nonpolar nature of the nematic director field. This review article highlights fascinating examples of new physical behavior arising from the interplay of nematic molecular order and both chiral symmetry and topology of colloidal inclusions within the nematic host. Furthermore, the article concludes with a brief discussion of how these findings may lay the groundwork for new types of topology-dictated self-assembly in soft condensed matter leading to novel mesostructured composite materials, as well as for experimental insights into the pure-math aspects of low-dimensional topology. © 2024, CC BY.

关键词： Crystal symmetry

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Quantum aspects of hydrodynamic transport from weak electron-impurity scattering

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Physical Review B 2020年第12期101卷 121107(R)-121107(R)页

作者： Aaron Hui Samuel Lederer Vadim Oganesyan Eun-Ah Kim School of Applied & Engineering Physics Cornell University Ithaca New York 14853 USA Department of Physics Cornell University Ithaca New York 14853 USA Department of Physics and Astronomy College of Staten Island CUNY Staten Island New York 10314 USA Physics Program and Initiative for the Theoretical Sciences The Graduate Center CUNY New York New York 10016 USA

Recent experimental observations of apparently hydrodynamic electronic transport have generated much excitement. However, the understanding of the observed nonlocal transport (whirlpool) effects and parabolic (Poiseuille-like) current profiles has largely been motivated by a phenomenological analogy to classical fluids. This is due to difficulty in incorporating strong correlations in quantum mechanical calculation of transport, which has been the primary angle for interpreting the apparently hydrodynamic transport. Here we demonstrate that even free-fermion systems, in the presence of (inevitable) disorder, exhibit nonlocal conductivity effects such as those observed in experiments because of the fermionic system's long-range entangled nature. On the basis of explicit calculations of the conductivity at finite wave vector, σ(q), for selected weakly disordered free-fermion systems, we propose experimental strategies for demonstrating distinctive quantum effects in nonlocal transport at odds with the expectations of classical kinetic theory. Our results imply that the observation of whirlpools or other “hydrodynamic” effects does not guarantee the dominance of electron-electron scattering over electron-impurity scattering.

关键词： Electrical conductivity Quantum field theory Disordered systems Hydrodynamics

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Electronic-photonic quantum systems on-chip

Electronic-photonic quantum systems on-chip

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Quantum 2.0, QUANTUM 2022

作者： Wang, Imbert Ramesh, Anirudh Kramnik, Danielius Fargas Cabanillas, Josep M. Stojanović, Vladimir Kumar, Prem Popović, Miloš A. Department of Electrical and Computer Engineering Photonics Center Boston University BostonMA02215 United States Graduate Program in Applied Physics Northwestern University EvanstonIL60208 United States Department of Electrical Engineering and Computer Science UC Berkeley BerkeleyCA94720 United States Center for Photonic Communication and Computing Dept. of Electrical and Computer Eng. Northwestern University EvanstonIL60208 United States

We present progress towards realizing electronic-photonic quantum systems on-chip;particularly, entangled photon-pair sources, placing them in the context of previous work, and outlining our vision for mass-producible... 详细信息

ISBN: (纸本)9781957171111

关键词： Quantum entanglement

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Overcoming intensity saturation in second harmonic nonlinear intersubband polaritonic metasurfaces using two-level systems 13

Overcoming intensity saturation in second harmonic nonlinear...

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Photonic and Phononic Properties of Engineered Nanostructures XIII 2023

作者： Krakofsky, Jonas H. Stich, Simon Cotrufo, Michele Mekawy, Ahmed Mann, Sander A. Köninger, Anna Boehm, Gerhard Alù, Andrea Belkin, Mikhail A. Walter Schottky Institute Technical University of Munich GarchingD-85748 Germany Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center City University of New York New YorkNY10016 United States Department of Electrical Engineering City College The City University of New York New YorkNY10031 United States

ISBN: (纸本)9781510659674

Nonlinear metasurfaces based on coupling of intersubband transitions in n-doped semiconductor heterostructures with optical modes in nanoresonators provide the largest known second-order nonlinear response in condensed matter systems in the mid-infrared spectral range. However, these giant nonlinearities are only present at relatively low pumping intensities which limits the maximum achievable frequency conversion efficiency. We experimentally investigate a new nonlinear intersubband metasurface design for second harmonic generation based on two-level nonlinear intersubband system that provides high nonlinearity combined with significantly reduced intensity saturation compared to the intersubband metasurfaces based on three-level intersubband systems demonstrated so far. © 2023 SPIE.

关键词： Harmonic generation

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Developing best practices for teaching scientific documentation: Toward a better understand of how lab notebooks contribute to knowledge-building in engineering design and experimentation

Developing best practices for teaching scientific documentat...

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2020 ASEE Virtual Annual Conference, ASEE 2020

作者： Evans, Rick Moses, Jeffrey Nathans-Kelly, Traci M. Engineering Communications Program College of Engineering Cornell University United States School of Applied and Engineering Physics College of Engineering Cornell University United States Cornell University United States

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Funneling of Lattice Vibrations Through Topological Phathways in Mid-Infrared Metasurfaces

Funneling of Lattice Vibrations Through Topological Phathway...

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CLEO: Science and Innovations, S and I 2022

作者： Guddala, S. Komissarenko, F. Kiriushechkina, S. Vakulenko, A. Li, M. Menon, V.M. Alù, A. Khanikaev, A.B. Department of Electrical Engineering City College of the City University of New York New YorkNY10031 United States Department of Physics City College of New York New YorkNY10031 United States Physics Program Graduate Center of the City University of New York New YorkNY10016 United States Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States

We demonstrate novel hybrid states of strongly-coupled photon and lattice vibrations in hexagonal boron nitride (hBN) integrated with mid-infrared metasurface and show their unconventional helical nature and resilient... 详细信息

ISBN: (纸本)9781557528209

关键词： Infrared devices

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A physical picture of liquid–liquid phase separation of proteins

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Journal of Molecular Liquids 2025年 424卷

作者： Kinoshita, Masahiro Hayashi, Tomohiko Nakamura, Yuka Yoshimori, Akira Katahira, Masato Nagata, Takashi Department of Chemistry of Science Chiba University 1-33 Yayoi-cho Inage Chiba263-8522 Japan Institute of Advanced Energy Kyoto University Kyoto Uji611-0011 Japan Interdisciplinary Program of Biomedical Engineering Assistive Technology and Art and Sports Sciences Faculty of Engineering Niigata University 8050 Ikarashi 2-no-cho Nishi-ku Niigata950-2181 Japan Department of Physics Niigata University Niigata950-2181 Japan

Liquid-liquid phase separation (LLPS) of proteins, by which they assemble and partition into a protein-dense phase and a protein-dilute phase, has caught much attention due to its essential roles in a variety of biological processes. Nevertheless, its mechanism remains to be unveiled. Here we develop a physical picture covering almost all the aspects of LLPSs of diverse systems. In our view, when only the proteins are looked at, one of the two phases is liquid-like and the other is gas-like. We relate LLPS to gas–liquid phase separation (GLPS) of simple fluids wherein the pivotal quantity is kBT (kB is the Boltzmann constant and T is the absolute temperature) divided by the absolute value of the minimum of interaction potential between fluid particles. GLPS occurs only if the pivotal quantity is sufficiently small. For LLPS, the interaction potential must be replaced by the potential of mean force (PMF) between protein molecules in aqueous solution. We do not explicitly consider aqueous solution, and its influence on properties of protein molecules is incorporated in PMF. PMF can reach its deep minimum when the two protein molecules associate. A physical interpretation is given for GLPS from a statistical-mechanics point of view, and it is extended to LLPS. In the extension, we discuss not only the similarities between the two phase separations but also the physical factors to be taken into account only in LLPS due to the fact that proteins are large molecules possessing polyatomic structures and they are immersed in aqueous solution. LLPS can be categorized as a biological self-assembly process. By reconsidering the results obtained in our earlier studies on biological self-assembly processes, we specify the entropic and energetic factors driving or opposing coacervation (association) of protein molecules followed by LLPS. We clarify the differences between LLPSs of folded proteins (i.e., proteins in the native states) and intrinsically disordered proteins. There c

关键词： Alkali halides

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Natural features, wettability, and optical diffraction patterns on an elastomeric replica of a superhydrophobic leaf derived via soft lithography

Natural features, wettability, and optical diffraction patte...

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Optical Manipulation and Structured Materials Conference 2023

作者： Budlayan, Marco Laurence M. Palangyos, Dina C. Patricio, Jonathan N. Arco, Susan D. Guerrero, Raphael A. Department of Physics Ateneo de Manila University Loyola Heights Quezon City1108 Philippines Mathematics and Natural Sciences Department College of Computing Pangasinan State University Pangasinan Urdaneta Philippines Materials Science and Engineering Program College of Science University of the Philippines Diliman Diliman Quezon City1101 Philippines Synthetic Organic Chemistry Laboratory Institute of Chemistry College of Science University of the Philippines Diliman Diliman Quezon City1101 Philippines

ISBN: (纸本)9781510663398

Surface features of natural materials such as cuticles, shells, and leaves continue to be used as models for creating sophisticated infrastructure, landscape, and microdevice designs. Optical microscopy is the easiest and most accessible tool for examining such surface features and micropatterns. This method, however, fails to probe opaque surfaces like thick skin and leaves since it needs enough light to penetrate the sample. In this work, we demonstrate the feasibility of probing the natural structures of a superhydrophobic leaf using simple optical microscopy by replicating the leaf surface on an elastomer via soft lithography. Optical images of the replica revealed intricate details of features present on the leaf, including the stoma, cuticle boundary, and trichome. Contact angle measurements were also conducted to investigate the wettability of the real leaves and their replicas. Finally, we utilized the fabricated replicas as optical gratings that were observed to generate various diffraction patterns with fluctuating intensities. Our work offers a new perspective on alternative optical microscopy strategies and optical beam tuning using biomimetic, low-cost materials. © 2023 SPIE.

关键词： Contact angle

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