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International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt)

作者： Mostafa Emara Hesham ElSawy Sameh Sorour Samir Al-Ghadhban Mohamed-Slim Alouini Tareq Y. Al-Naffouri Department of Electrical Engineering King Fahd University of Petroleum and Minerals (KFUPM) Saudi Arabia King Abdullah University of Science and Technology Thuwal SA Department of Electrical and Computer Engineering University of Idaho USA CEMSE Division EE program King Abdullah University of Science and Technology (KAUST) Saudi Arabia

ISBN: (纸本)9781509047109

Cache-enabled base station (BS) densification, denoted as a fog radio access network (F-RAN), is foreseen as a key component of 5G cellular networks. F-RAN enables storing popular files at the network edge (i.e., BS caches), which empowers local communication and alleviates traffic congestions at the core/backhaul network. The hitting probability, which is the probability of successfully transmitting popular files request from the network edge, is a fundamental key performance indicator (KPI) for F-RAN. This paper develops a scheduling aware mathematical framework, based on stochastic geometry, to characterize the hitting probability of F-RAN in a multi-channel environment. To this end, we assess and compare the performance of two caching distribution schemes, namely, uniform caching and Zipf caching. The numerical results show that the commonly used single channel environment leads to pessimistic assessment for the hitting probability of F-RAN. Furthermore, the numerical results manifest the superiority of the Zipf caching scheme and quantify the hitting probability gains in terms of the number of channels and cache size.

关键词： Stochastic processes Mathematical model Geometry Interference Cellular networks Numerical models Conferences

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Study of large-grained n-type polycrystalline silicon thin films made by the solid phase crystallization method

Study of large-grained n-type polycrystalline silicon thin f...

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2013 IEEE 39th Photovoltaic Specialists Conference (PVSC)

作者： A. Kumar P.I. Widenborg F. Law H. Hidayat G.K. Dalapati A. G. Aberle Department of Electrical and Computer Engineering National University of Singapore Singapore Solar Energy Research Institute of Singapore National University of Singapore Singapore Institute of Materials Research and Engineering A *STAR (Agency for Science Technology and Research) Singapore

N-type polycrystalline silicon (poly-Si) films with large grains exceeding 30 μm in width are successfully prepared by the solid phase crystallization (SPC) technique on glass through a control of the PH 3 gas flow rate. The grains in the poly-Si films are investigated by electron backscatter diffraction (EBSD) and are found to be randomly oriented, whereby the average grain size ranges from 4.3 to 18 μm. The grain size in the poly-Si film increases with increasing PH 3 gas flow rate. The impact of the PH 3 flow rate on the crystal quality and the electronic properties of the poly-Si thin-film solar cells are systematically investigated using UV reflectance and Hall effect measurements. A Hall mobility of about 71.5 cm 2 /Vs for n + doped poly-Si films with a carrier concentration of 2.3×10 19 cm -3 is obtained.

关键词： Films Grain size Fluid flow Silicon Photovoltaic cells Hall effect

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Near infrared optical upconverter based on i-In0.53Ga0.47As/C60 photovoltaic junction

Near infrared optical upconverter based on i-In0.53Ga0.47As/...

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Conference on Lasers and Electro-Optics, CLEO 2009

作者： Chen, Jun Ban, Dayan Helander, Michael G. Lu, Zhenghong Graf, Marcel SpringThorpe, Anthony J. Liu, H.C. Department of Electrical and Computer Engineering University of Waterloo 200 University Avenue West Waterloo N2L 3G1 Canada Department of Materials Science and Engineering University of Toronto 184 College Street Toronto M5S 3E4 Canada Institute for Microstructural Sciences National Research Council M-50 1200 Montreal Road Ottawa K1A 0R6 Canada

We report a near-infrared to visible-light optical upconverter by the integration of an i-In0.53Ga0.47As/C60 junction and organic light emitting diode. This device shows the photovoltaic effect of i-In0.53Ga0.47As/C60... 详细信息

ISBN: (纸本)9781557528698

关键词： Photovoltaic effects

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Multifunctional Fiber-based Optoacoustic Emitter for Non-genetic Bidirectional Neural Communication

arXiv

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arXiv 2023年

作者： Zheng, Nan Jiang, Ying Jiang, Shan Kim, Jongwoon Li, Yueming Cheng, Ji-Xin Jia, Xiaoting Yang, Chen Division of Materials Science and Engineering Boston University BostonMA United States Department of Biomedical Engineering Boston University BostonMA United States Bradley Department of Electrical and Computer Engineering Virginia Tech BlacksburgVA United States Department of Mechanical Engineering Boston University BostonMA United States Department of Chemistry Boston University BostonMA United States Department of Electrical and Computer Engineering Boston University BostonMA United States

A bidirectional brain interface with both "write" and "read" functions can be an important tool for fundamental studies and potential clinical treatments for neurological diseases. Here we report a miniaturized multifunctional fiber based optoacoustic emitter (mFOE) that first integrates simultaneous non-genetic optoacoustic stimulation for "write" and electrophysiology recording of neural circuits for "read". The non-genetic feature addresses the challenges of the viral transfection required by optogenetics in primates and human. The orthogonality between optoacoustic waves and electrical field provides a solution to avoid the interference between electrical stimulation and recording. We first validated the non-genetic stimulation function of the mFOE in rat cultured neurons using calcium imaging. In vivo application of mFOE for successful simultaneous optoacoustic stimulation and electrical recording of brain activities was confirmed in mouse hippocampus in both acute and chronical applications up to 1 month. Minimal brain tissue damage has been confirmed after these applications. The capability of non-genetic neural stimulation and recording enabled by mFOE opens up new possibilities for the investigation of neural circuits and brings new insights into the study of ultrasound neurostimulation. Copyright © 2023, The Authors. All rights reserved.

关键词： Electrophysiology

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Noncontact manipulation of Ni nanowires using a rotating magnetic field

Noncontact manipulation of Ni nanowires using a rotating mag...

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IEEE Conference on Nanotechnology

作者： Li Zhang Yang Lu Lixin Dong R. Pei Jun Lou Bradley E. Kratochvil Bradley J. Nelson Institute of Robotics and Intelligent Systems ETH Zurich Zurich Switzerland Department of Mechanical Engineering & Materials Science Rice University Houston TX USA Department of Electrical & Computer Engineering Michigan State University East Lansing MI USA

ISBN: (纸本)9781424448326

Ni nanowires (NWs) are driven in water using a rotating magnetic field. The NWs show various locomotion performances under different boundary conditions. Pure rotation occurs when the two ends of the NWs are homogenously constrained. However, if the boundary conditions are different at the two ends of the NWs, tumbling motion, i.e., rotation plus translation, will be generated, which leads to the propulsion of NWs near a wall. These motions of NWs can be steered by the magnetic field. In addition, we present that the two NWs self-assemble to form a single NW with the magnetic field. The results imply that magnetic field is a promising approach for noncontact manipulation of Ni NWs or other 1-D ferromagnetic nanostructures at low Reynolds number aqueous environment in a controllable fashion.

关键词： Nanowires Magnetic fields Nanostructures Propulsion Boundary conditions Intelligent robots Biomedical optical imaging Optical sensors Magnetic liquids Electrodes

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Synergetic Effect of Ligand Removal, Reparation, and Surface Encapsulation of Cspbbr3 Quantum Dots with Improved Brightness and Stability

SSRN

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SSRN 2022年

作者： Song, Jang-Kun Zhang, Yi Song, Suk-Ho Yoo, Jae-In Kim, Hyo-Bin Shan, Qingsong Zeng, Haibo Department of Electrical and Computer Engineering Sungkyunkwan University Jangan-Gu Gyeonggi-do Suwon16419 Korea Republic of MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics & Nanomaterials School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing210094 China

Colloidal CsPbBr3 perovskite quantum dots (PQDs) are promising optoelectronic materials for use in solution-processed photoelectric devices. However, fabricating PQD thin films with high efficiency and good stability is still challenging. In this study, we investigate the synergetic effects of ligand removal using MeOAc washing, defect repair using cesium acetate (CsAc), and surface encapsulation using hexamethyldisilazane (HMDS) on the photoluminescence (PL) intensity and ambient stability of PQD thin films. The PL intensity is significantly improved by ligand removal and defect repair, and ambient stability is governed primarily by the SiO passivation process. However, the synergetic effect of these post-treatments is also important;the highest PL intensity and the best ambient stability are observed for the sample treated by all three post treatments in the proper order. The PL intensity is enhanced by a factor of up to 3.4, and the ambient instability is reduced by approximately 40 % compared with that of the untreated sample. Defect repair using CsAc is achievable only after the ligand is completely removed. Thus, these results provide essential information and an approach for post-treatments to obtain PQD films with high efficiency and robust stability. © 2022, The Authors. All rights reserved.

关键词： Stability

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Robust Coupling between Structural and Electronic Transitions in a Mott Material

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Physical Review Letters 2019年第5期122卷 057601-057601页

作者： Yoav Kalcheim Nikita Butakov Nicolas M. Vargas Min-Han Lee Javier del Valle Juan Trastoy Pavel Salev Jon Schuller Ivan K. Schuller Department of Physics and Center for Advanced Nanoscience University of California San Diego La Jolla California 92093 USA Department of Electrical and Computer Engineering University of California Santa Barbara Santa Barbara California 93106 USA Material Science and Engineering Program University of California San Diego La Jolla California 92093 USA

The interdependences of different phase transitions in Mott materials are fundamental to the understanding of the mechanisms behind them. One of the most important relations is between the ubiquitous structural and electronic transitions. Using IR spectroscopy, optical reflectivity, and x-ray diffraction, we show that the metal-insulator transition is coupled to the structural phase transition in V2O3 films. This coupling persists even in films with widely varying transition temperatures and strains. Our findings are in contrast to recent experimental findings and theoretical predictions. Using V2O3 as a model system, we discuss the pitfalls in measurements of the electronic and structural states of Mott materials in general, calling for a critical examination of previous work in this field. Our findings also have important implications for the performance of Mott materials in next-generation neuromorphic computing technology.

关键词： Crystal growth Crystal orientation Crystal structure Crystal symmetry Crystallization Electronic structure Peierls transition Phase transitions Spin state transition Strain Antiferromagnets Mott insulators Stimuli-responsive materials Strongly correlated systems Thin films Cavity resonators Crystallography Fourier transform infrared spectroscopy Resistivity measurements Scanning techniques Sputtering Strain engineering X-ray diffraction

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Lightweight Monolithic Microcell CPV for Space

Lightweight Monolithic Microcell CPV for Space

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2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)

作者： Christian J. Ruud Jared S. Price Brent Fisher Baomin Wang Noel C. Giebink Department of Materials Science and Engineering The Pennsylvania State University University Park Pennsylvania USA School of Electrical Engineering and Computer Science The Pennsylvania State University University Park Pennsylvania USA H-NU Systems LLC Bethesda Maryland USA

Concentrating photovoltaics (CPV) can increase the efficiency and reduce the cost of photovoltaic power in space. We introduce a new monolithic, ultrathin, and lightweight CPV paradigm based on a transfer-printed microscale solar cell array. In our reflective design, the microcell array is embedded in a radiation-tolerant glass optic that delivers 83% optical efficiency with a ±7° acceptance angle at 32× geometric gain. The system is

关键词： Optical reflection Microcell networks Glass Geometrical optics Optical device fabrication Optical refraction Adaptive optics

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Vortex chirality in an array of ferromagnetic dots

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Physical Review B 2002年第17期65卷 172419-172419页

作者： M. Grimsditch P. Vavassori V. Novosad V. Metlushko H. Shima Y. Otani K. Fukamichi Materials Science Division Argonne National Laboratory Argonne Illinois 60439 INFM Dipartimento di Fisica Universitá di Ferrara I-44100 Italy Department of Electrical Engineering and Computer Science University of Illinois at Chicago Chicago Illinois 60607 Department of Materials Science Graduate School of Engineering Tohoku University Sendai 980-8579 Japan Japan Science & Technology Corporation CREST Kawaguchi 3320012 Japan

Magnetization of an array of submicron permalloy dots was investigated using the diffracted magneto-optical Kerr effect. The shapes of the higher-order hysteresis loops are explained by the magnetic form factors associated with a vortex spin structure in each disk. The imaginary part of the form factor also explains the unexpected measured differences between hysteresis loops obtained on positive and negative diffraction orders. Shape effects account for the coherent chirality of the vortices over the array.

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Capacitive sensing for degradation assessment in bismaleimide/glass-fiber composites

Capacitive sensing for degradation assessment in bismaleimid...

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Conference on electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Connor Daily Robert Sheldon Vinay Dayal Nicola Bowlerl Department of Materials Science and Engineering Iowa State University Ames IA USA Department of Computer and Electrical Engineering Iowa State University Ames IA USA Center for Nondestructive Evaluation Iowa State University Ames IA USA

New aircraft designs increasingly contain more components made from polymer matrix composites, in both primary and secondary roles. This demands new monitoring techniques that emphasize the role played by polymer matrix degradation in the failure of these parts. The polymer matrix does not take significant load in tension but must transfer shear load. The present work investigates changes in surface chemistry due to accelerated thermo-oxidative aging on a bismaleimide (BMI) laminate system reinforced with woven glass fiber. BMI is used for high temperature applications up to 230 °C. Samples are isothermally aged at various temperatures whose selection is guided by degradation steps revealed by thermo-gravimetric analysis. Permittivity of aged samples is measured as a function of frequency from 200 Hz to 2 MHz, using a parallel-plate electrode design. Results are compared with measured interlaminar shear stress to assess the suitability of capacitive sensing as a method for nondestructive monitoring of thermo-oxidative aging in this material system.

关键词： Aging Degradation Temperature measurement Electrodes Permittivity Polymers Frequency measurement

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