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Cloud computing model in higher education

IOP Conference Series: materials science and engineering 2020年第1期852卷

作者： Bagus Mulyawan Raymond Kosala Benny Ranti Suhono Harso Supangkat Binus Graduate Program Doctor of Computer Science Bina Nusantara University Jakarta Indonesia Faculty of Information Technology Universitas Tarumanagara Jakarta 11440 Computer Science Department Faculty of Computer Science Universitas Indonesia Indonesia 16424 Schoolof Electrical Engineering and Informatics Bandung Institute of Technology Bandung Indonesia

Currently, higher education is institutions that should be managed as a global business institution. Higher education should improve continually its business processes according to the demands of increasing its stakeholders. of the problems faced in the development of educational, activities if related to the use of information technology for each service in higher education for stakeholders is the issue of available funds. Cloud computing also has advantages related to infrastructure and maintenance and increases operating efficiency. Most institutions are currently moving towards cloud computing technology to reduce operational costs. For achieving these objectives, the institutions need to be supported by reliable technology. This study aim to propose cloud model for education and IT Governance conceptual framework for Cloud Computing model adoption, Tarumanagara University as a study case.

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Closing of the Induced Gap in a Hybrid Superconductor-Semiconductor Nanowire

arXiv

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arXiv 2020年

作者： Puglia, D. Martinez, E.A. Ménard, G.C. Pöschl, A. Gronin, S. Gardner, G.C. Kallaher, R. Manfra, M.J. Marcus, C.M. Higginbotham, A.P. Casparis, L. Microsoft Quantum Labs Copenhagen Center for Quantum Devices Niels Bohr Institute University of Copenhagen Universitetsparken 5 Copenhagen2100 Denmark Institute of Science and Technology Austria Am Campus 1 Klosterneuburg3400 Austria Microsoft Quantum Purdue Birck Nanotechnology Center Purdue University West LafayetteIN United States Department of Physics and Astronomy Purdue University West LafayetteIN United States School of Materials Engineering Purdue University West LafayetteIN United States School of Electrical and Computer Engineering Purdue University West LafayetteIN United States

Hybrid superconductor-semiconductor nanowires are predicted to undergo a field-induced phase transition from a trivial to a topological superconductor, marked by the closure and re-opening of the excitation gap, followed by the emergence of Majorana bound states at the nanowire ends [1, 2]. Many local density-of-states measurements have reported signatures of the topological phase [3], however this interpretation has been challenged by alternative explanations [4–10]. Here, by measuring nonlocal conductance, we identify the closure of the excitation gap in the bulk of the semiconductor before the emergence of zero-bias peaks. This observation is inconsistent with scenarios where zero-bias peaks occur due to end-states with a trivially gapped bulk, which have been extensively considered in the theoretical [4–10] and experimental [11–13] literature. We observe that after the gap closes, nonlocal signals fluctuate strongly and persist irrespective of the presence of local-conductance zero-bias peaks. Thus, our observations are also incompatible with a simple picture of clean topological superconductivity [1, 2]. This work presents a new experimental approach for probing the spatial extent of states in Majorana wires, and reveals the presence of a regime with a continuum of spatially extended states and uncorrelated zero-bias peaks. Copyright © 2020, The Authors. All rights reserved.

关键词： Nanowires

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Reprint of "Effect of substrate bias on biocompatibility of amorphous carbon coatings deposited on Ti6Al4V by PECVD"

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Surface and Coatings Technology 2019年 376卷 124787-000页

作者： Cho, Yun-Shao Liao, Li-Kai Hsu, Chia-Hsun Hsu, Yu-Hsuan Wu, Wan-Yu Liao, Shu-Chuan Chen, Kun-Hui Lui, Ping-Wing Zhang, Sam Lien, Shui-Yang Department of Materials Science and Engineering Da-Yeh University Chunghua51591 Taiwan Department of Computer Science Peking University Peking102600 China School of Opto-electonic and Communication Engineering Xiamen University of Technology Xiamen361024 China Bachelor Program for Design and Materials for Medical Equipment and Devices Da-Yeh University Changhua51591 Taiwan Department of Orthopedics Taichung Veterans General Hospital Taichung40705 Taiwan Department of Anesthesiology Taichung Veterans General Hospital Taichung40705 Taiwan Department of Medical Research Taichung Veterans General Hospital Taichung40705 Taiwan Faculty of Materials and Energy Southwest University Chongqing400715 China

Long service life of implants is of high importance to patients. This study deposited amorphous carbon (a-C) coatings on biomedical grade Ti6Al4V substrate using plasma-enhanced chemical vapor deposition (PECVD). The effect of substrate bias power on microstructure and corrosion of the coatings is investigated and compared with the bare Ti6Al4V substrate. The experimental results show that the substrate bias power of 30 W leads to amorphous carbon in microstructure. With increased bias nanocrystalline graphite appears. All coated samples have significant improvements in corrosion resistivity as compared to Ti6Al4V alone. The sample deposited at bias power of 30 W with a thickness of 150 nm demonstrated the lowest corrosion current of 6.47 nA/cm2 and the lowest corrosion rate of 8.05 nm/year, which can postpone the corrosion of the Ti6Al4V substrate for at least 18 years. From the in-vitro cell culture studies, the best sample also registered the higher cell viability and biocompatibility as compared to bare Ti6Al4V, thus could be helpful in promoting healing. © 2019

关键词： Ternary alloys

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Development of a smartphone-based app for determination of formaldehyde concentration indoors 15

Development of a smartphone-based app for determination of f...

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15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018

作者： Zhang, Siyang Shapiro, Nicholas Gehrke, Gretchen Castner, Jessica Liu, Zhenlei Guo, Beverly Zhang, Jianshun Haines, Sarah Kormos, David Frey, Paige Qin, Rongjun Dannemiller, Karen C. Department of Computer Science and Engineering Ohio State University United States Public Laboratory for Open Technology and Science Department of Mechanical and Aerospace Engineering Syracuse University Environmental Science Graduate Program Ohio State University United States Department of Civil Environmental and Geodetic Engineering College of Engineering Ohio State University United States Strand Associates Incorporated Department of Electrical and Computer Engineering Ohio State University United States Department of Environmental Health Sciences College of Public Health Ohio State University United States

ISBN: (纸本)9781713826514

Formaldehyde is a ubiquitous contaminant in the indoor environment that is both a carcinogen and irritant. The goal of this project is to develop a smartphone-based app for use by citizen scientists or researchers that can be paired with low-cost colorimetric badges for detection of indoor formaldehyde. We conducted both national and geographically-targeted surveys prior to app design. We have subsequently developed the app and conducted a beta test. Surveys of 147 individuals indicated broad public interest in formaldehyde testing using smartphone technology. Testing of the badges indicated consistent change in illumination with increasing formaldehyde exposure. Beta testing indicated users were able to navigate the existing app, and highlighted areas for improvement including incorporation of public surveys. Planned future analysis includes extensive calibration testing and a community-based field test. © 2018 15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018. All rights reserved.

关键词： Formaldehyde

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Coordinate Dual Averaging for Decentralized Online Optimization with Nonseparable Global Objectives

Coordinate Dual Averaging for Decentralized Online Optimizat...

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作者： Lee, Soomin Nedic, Angelia Raginsky, Maxim Department of Mechanical Engineering and Materials Science Duke University DurhamNC27708 United States Department of Industrial and Enterprise Systems Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States

We consider a decentralized online convex optimization problem in a network of agents, where each agent controls only a coordinate (or a part) of the global decision vector. For such a problem, we propose two decentralized variants (ODA-C and ODA-PS) of Nesterov's primal-dual algorithm with dual averaging. In ODA-C, to mitigate the disagreements on the primal-vector updates, the agents implement a generalization of the local information-exchange dynamics recently proposed by Li and Marden [1] over a static undirected graph. In ODA-PS, the agents implement the broadcast-based push-sum dynamics [2] over a time-varying sequence of uniformly connected digraphs. We show that the regret bounds in both cases have sublinear growth of O(T), with the time horizon T, when the stepsize is of the form 1t and the objective functions are Lipschitz-continuous convex functions with Lipschitz gradients. We also implement the proposed algorithms on a sensor network to complement our theoretical analysis. © 2014 IEEE.

关键词： Convex optimization

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Electromagnetic aspects of practical approaches to realization of intelligent metasurfaces

arXiv

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arXiv 2019年

作者： Liu, F. Tsilipakos, O. Wang, X. Pitilakis, A. Tasolamprou, A.C. Mirmoosa, M.S. Kwon, D.-H. Kossifos, K. Georgiou, J. Kafesaki, M. Soukoulis, C.M. Tretyakov, S.A. Aalto University Department of Electronics and Nanoengineering Maarintie 8 Espoo02150 Finland Foundation for Research and Technology Hellas Heraklion71110 Greece Aristotle University of Thessaloniki Dept. of Electrical and Computer Engineering Thessaloniki Greece University of Massachusetts Amherst Dept. of Electrical and Computer Engineering Massachusetts United States University of Cyprus Department of Electrical and Computer Engineering 1 Panepistimiou Avenue Aglanzia Nicosia2109 Singapore University of Crete Department of Materials Science and Technology Heraklion Crete71003 Greece Ames Laboratory Dept. of Physics and Astronomy Iowa State University AmesIW50011 United States

We thoroughly investigate the electromagnetic response of intelligent functional metasurfaces. We study two distinct designs operating at different frequency regimes, namely, a switch-fabric-based design for GHz frequencies and a graphene-based approach for THz band, and discuss the respective practical design considerations. The performance for tunable perfect absorption applications is assessed in both cases. Copyright © 2019, The Authors. All rights reserved.

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Evidence of rotational Fröhlich coupling in polaronic trions

arXiv

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arXiv 2019年

作者： Trushin, Maxim Sarkar, Soumya Mathew, Sinu Goswami, Sreetosh Adam, Shaffique Venkatesan, T. Centre for Advanced 2D Materials National University of Singapore Singapore117546 Singapore NUSNNI NanoCore National University of Singapore Singapore117411 Department of Physics National University of Singapore Singapore117551 Singapore Yale-NUS College Singapore138527 Singapore Department of Electrical and Computer Engineering and Materials Science and Engineering National University of Singapore Singapore117583 Singapore

Electrons commonly couple through Fröhlich interactions with longitudinal optical phonons to form polarons. However, trions possess a finite angular momentum and should therefore couple instead to rotational optical phonons. This creates a polaronic trion whose binding energy would be determined by the crystallographic orientation of the lattice. Here, we demonstrate theoretically within the Fröhlich approach and experimentally by photoluminescence emission that the binding energy of the bare trion (20 meV) is significantly enhanced by the phonons at the interface between two-dimensional semiconductor MoS2 and bulk transition metal oxide SrTiO3. The low-temperature binding energy changes from 60 meV in [001]-oriented substrates to 90 meV for [111] orientation, a result of the counter-intuitive interplay between the rotational axis of the MoS2 trion and that of the SrTiO3 phonon mode. Copyright © 2019, The Authors. All rights reserved.

关键词： Binding energy

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Exploring interfacial exchange coupling and sublattice effect in heavy metal/ferrimagnetic insulator heterostructures using Hall measurements, x-ray magnetic circular dichroism, and neutron reflectometry

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Physical Review B 2019年第10期99卷 104401-104401页

作者： Qiming Shao Alexander Grutter Yawen Liu Guoqiang Yu Chao-Yao Yang Dustin A. Gilbert Elke Arenholz Padraic Shafer Xiaoyu Che Chi Tang Mohammed Aldosary Aryan Navabi Qing Lin He Brian J. Kirby Jing Shi Kang L. Wang Department of Electrical and Computer Engineering University of California Los Angeles California 90095 USA NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland 20899-6102 USA Department of Physics and Astronomy University of California Riverside California 92521 USA Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Materials Science and Engineering University of Tennessee Knoxville Tennessee 37996 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics and Astronomy King Saud University Riyadh 11451 Saudi Arabia International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Department of Physics and Astronomy Department of Materials Science and Engineering University of California Los Angeles California 90095 USA

We use temperature-dependent Hall measurements to identify contributions of spin Hall, magnetic proximity, and sublattice effects to the anomalous Hall signal in heavy metal/ferrimagnetic insulator heterostructures with perpendicular magnetic anisotropy. This approach enables detection of both the magnetic proximity effect onset temperature and the magnetization compensation temperature and provides essential information regarding the interfacial exchange coupling. Onset of a magnetic proximity effect yields a local extremum in the temperature-dependent anomalous Hall signal, which occurs at higher temperature as magnetic insulator thickness increases. This magnetic proximity effect onset occurs at much higher temperature in Pt than W. The magnetization compensation point is identified by a sharp anomalous Hall sign change and divergent coercive field. We directly probe the magnetic proximity effect using x-ray magnetic circular dichroism and polarized neutron reflectometry, which reveal an antiferromagnetic coupling between W and the magnetic insulator. Finally, we summarize the exchange-coupling configurations and the anomalous Hall-effect sign of the magnetized heavy metal in various heavy metal/magnetic insulator heterostructures.

关键词： Spintronics Magnetic insulators

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Metamorphosis of discontinuity lines and rectification of magnetic flux avalanches in the presence of noncentrosymmetric pinning forces

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Physical Review B 2021年第22期103卷 224514-224514页

作者： M. Motta L. Burger Lu Jiang J. D. González Acosta Ž. L. Jelić F. Colauto W. A. Ortiz T. H. Johansen M. V. Milošević C. Cirillo C. Attanasio Cun Xue A. V. Silhanek B. Vanderheyden Departamento de Física Universidade Federal de São Carlos 13565-905 São Carlos São Paulo Brazil Montefiore Research Unit Department of Electrical Engineering and Computer Science Université de Liège 4000 Sart Tilman Belgium School of Aeronautics Northwestern Polytechnical University Xi'an 710072 China Facultad de Ingeniería Universidad del Magdalena Santa Marta Colombia Departement Fysica Universiteit Antwerpen Groenenborgerlaan 171 B-2020 Antwerpen Belgium Nokia Bell Labs Antwerp Belgium Department of Physics University of Oslo POB 1048 Blindern 0316 Oslo Norway CNR-SPIN c/o Università degli Studi di Salerno I-84084 Fisciano (Sa) Italy Dipartimento di Fisica “E.R. Caianiello” Università degli Studi di Salerno I-84084 Fisciano (Sa) Italy School of Mechanics Civil Engineering and Architecture and MIIT Key Laboratory of Dynamics and Control of Complex Systems Northwestern Polytechnical University Xi'an 710072 China Experimental Physics of Nanostructured Materials Q-MAT CESAM Université de Liège B-4000 Sart Tilman Belgium

Considering a noncentrosymmetric pinning texture composed of a square array of triangular holes, the magnetic flux penetration and expulsion are investigated experimentally and theoretically. A direct visualization of the magnetic landscape obtained using a magneto-optical technique on a Nb film is complemented by a multiscale numerical modeling. This combined approach allows the magnetic flux dynamics to be identified from the single flux quantum limit up to the macroscopic electromagnetic response. Within the theoretical framework provided by time-dependent Ginzburg-Landau simulations, an estimation of the in-plane current anisotropy is obtained and its dependence with the radius of the curvature of hole vertices is addressed. These simulations show that current crowding plays an important role in channeling the flux motion, favoring hole-to-hole flux hopping rather than promoting interstitial flux displacement in between the holes. The resulting anisotropy of the critical current density gives rise to a distinct pattern of discontinuity lines for increasing and decreasing applied magnetic fields, in sharp contrast to the invariable patterns reported for centrosymmetric pinning potentials. This observation is partially accounted for by the rectification effect, as demonstrated by finite-element modeling. At low temperatures, where magnetic field penetration is dominated by thermomagnetic instabilities, highly directional magnetic flux avalanches with a fingerlike shape are observed to propagate along the easy axis of the pinning potential. This morphology is reproduced by numerical simulations. Our findings demonstrate that anisotropic pinning landscapes and, in particular, ratchet potentials produce subtle modifications to the critical state field profile that are reflected in the distribution of discontinuity lines.

关键词： Flux pinning Magneto-optical effect Monolayer films Superconductors Finite-element method Landau-Ginzburg theory

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Low Noise, High Gain-Bandwidth Photodetectors Using Cycling Exciting Process (CEP) as Amplification Mechanism

Low Noise, High Gain-Bandwidth Photodetectors Using Cycling ...

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IEEE Conference on Electron Devices and Solid-State Circuits

作者： Lujiang Yan Yugang Yu Zihan Xu Iftikhar Niaz Mohammad Abu Raihan Miah Alex Ce Zhang Jiayun Zhou Yuhwa Lo Electrical and Computer Engineering Department UCSD Materials Science and Engineering UCSD CA 9500 Gilman Drive USA

ISBN: (纸本)9781538662359

We report a new physical mechanism, cycling excitation process (CEP), that produces intrinsic gain for photocurrent. The CEP process has shown much greater efficiency and lower noise than the impact ionization process, the mechanism for avalanche photodetectors. Using the CEP process, we have obtained detectors of low excess noise and a record high gain-bandwidth product of over 2 THz. Above all, such performance was obtained from a thin (30nm) layer of amorphous silicon as the gain medium.

关键词： Photoconductivity Impact ionization Detectors Avalanche photodiodes Amorphous silicon Noise measurement

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