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Advanced materials 2021年第19期33卷

作者： Veenasri Vallem Yasaman Sargolzaeiaval Mehmet Ozturk Ying-Chih Lai Michael D. Dickey Department of Chemical and Biomolecular Engineering North Carolina State University Raleigh NC 27695 USA Department of Electrical and Computer Engineering North Carolina State University Raleigh NC 27695 USA Department of Materials Science and Engineering National Chung Hsing University Taichung 402 Taiwan Innovation and Development Center of Sustainable Agriculture Research Center for Sustainable Energy and Nanotechnology National Chung Hsing University Taichung 402 Taiwan

5G Channel Model for 28 GHz frequency in Palembang

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Journal of Physics: Conference Series 2020年第1期1500卷

作者： B Alfaresi Z Nawawi R F Malik K Anwar Electrical Engineering Universitas Muhammadiyah Palembang Indonesia Doctoral Program of Engineering Science Universitas Sriwijaya Indonesia Electrical Engineering Universitas Sriwijaya Indonesia Computer Science Department Universitas Sriwijaya Indonesia Center for Advanced Wireless Technologies (AdWiTech) Telkom University Indonesia

Next generation wireless technology require a wide frequency band. Current technology use a frequency of below 3 GHz which cannot provide a wide frequency band due to quite dense frequency utilization. The mm-Wave frequency guarantee to provide a wide band frequency band. The use of mm-Wave frequency will be influenced by climate factors. The characteristics of a place will cause a different channel model. Channel Model is useful for minimizes errors and maximizes information transmission or bitrate in communication model. The Channel Model will be represented as a PDP (Power Delay Profile). Channel model performance uses the Outage performance parameter in Shannon Theorem Implementation. Validation results using the CP-OFDM system with 5G BPSK. The parameters used for validation are FER and BER. In this paper, channel models will be analysed based on the characteristic of Palembang area as a reference channel model in Outer of Indonesia. Hopefully, it can be used as a reference for the development 5G wireless system.

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Designing the Application of Security Text Messages into Audio Files Using Data Encryption Standard (DES) Algorithms Using the End of File (EOF) Method 1

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Designing the Application of Security Text Messages into Aud...

1st Workshop on Environmental science, Society, and Technology, WESTECH 2018

作者： Pardede, A.M.H. Pramana, Anggi Zarlis, Muhammad Iskandar, Akbar Manurung, Rosida Tiurma Sriadhi, S. Kurniawan, Citra Hasibuan, Abdurrozzaq Siregar, Nurintan Asyiah Sari, Ayu Esteka Mulyaningsih, Indrya Iskandar Alam, Teguh Hidayat Ibrahim Listyorini, Tri Winarno, Edy Tulus STMIK Kaputama Binjai Sumatera Utara Indonesia Department of Computer Science Universitas Sumatera Utara Medan Indonesia Department of Informatics STMIK AKBA Makassar Indonesia Graduate Program in Scientific Psychology Universitas Kristen Maranatha Indonesia Department of Electrical Engineering Universitas Negeri Medan Indonesia Department of Electrical Engineering Sekolah Tinggi Teknik Malang Indonesia Faculty of Engineering Universitas Islam Sumatera Utara Medan Indonesia Department of Management STIE Labuhanbatu Sumatera Utara Indonesia Department of Management STIE Sakti Alam Kerinci Jambi Indonesia Department of Indonesian Language Teaching Institut Agama Islam Negeri Syekh Nurjati Cirebon Indonesia Department of Informatics Engineering Universitas Muhammadiyah Sorong Sorong Indonesia Department of English Education Universitas Muhammadiyah Sorong Sorong Indonesia Department of Informatics Universitas Muria Kudus Indonesia Faculty of Information Technology Universitas Stikubank Semarang Indonesia Department of Mathematics Universitas Sumatera Utara Medan Indonesia

There are several ways to deal with security issues of confidential data sent via the internet, including using cryptographic techniques and steganography. Steganography is the science and art of concealing information / messages in a media in such a way that its existence is not detected by other parties who are not entitled to the information. Instead, cryptography disguises the meaning of a message, but does not hide that there is a message because the file looks suspicious. The Steganography technique used here was End Of File (EOF). The EOF technique described how to add data or files at the end of the image file. For this technique, the size of data or files that will be hidden could be larger than the size of the image file. The hidden data will be inserted at the end of the file so that it will not affect the image. This steganography application is also equipped with a cryptographic function Data Encryption Standard (DES) at the time of insertion of data that functions as a generator code and encrypts data, so that the security of a data in the file is more protected and protected from those who are not entitled to know the data. © Published under licence by IOP Publishing Ltd.

关键词： Steganography

Delta-doped β-Ga2O3 thin films and β-(Al0.26Ga0.74)2O3/β-Ga2O3 heterostructures grown by metalorganic vapor-phase epitaxy

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arXiv 2019年

作者： Ranga, Praneeth Bhattacharyya, Arkka Rishinaramangalam, Ashwin Ooi, Yu Kee Scarpulla, Michael A. Feezell, Daniel Krishnamoorthy, Sriram Department of Electrical and Computer Engineering University of Utah Salt Lake CityUT84112 United States Center for High Technology Materials University of New Mexico AlbuquerqueNM87106 United States Department of Materials Science and Engineering University of Utah Salt Lake CityUT84112 United States

We report on silicon delta doping of metalorganic vapor-phase epitaxy-grown β-Ga2O3 thin films using silane precursor. Delta-doped β-Ga2O3 epitaxial films are characterized using capacitance-voltage profiling and secondary-ion mass spectroscopy. Electron sheet charge density in the range of 2.9 x 1012 cm -2 to 8 x 1012 cm-2 with a half width at half maximum ranging from 6.2 nm – 3.5 nm is measured. We also demonstrate a high density (6.4 x 1012 cm-2) degenerate two-dimensional electron gas using a delta-doped β-(Al0.26Ga0.74)2O3/βGa2O3 heterostructure. Copyright © 2019, The Authors. All rights reserved.

关键词： Capacitance

Magnetic Control of Soft Chiral Phonons in PbTe

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arXiv 2021年

作者： Baydin, Andrey Hernandez, Felix G.G. Rodriguez-Vega, Martin Okazaki, Anderson K. Tay, Fuyang Timothy Noe, G. Katayama, Ikufumi Takeda, Jun Nojiri, Hiroyuki Rappl, Paulo H.O. Abramof, Eduardo Fiete, Gregory A. Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Instituto de Física Universidade de São Paulo SP São Paulo05508-090 Brazil Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States Laboratório Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais SP São José dos Campos12201-970 Brazil Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama240-8501 Japan Institute for Materials Research Tohoku University Sendai980-8577 Japan Department of Physics Northeastern University BostonMA02115 United States Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

PbTe crystals have a soft transverse optical phonon mode in the terahertz frequency range, which is known to efficiently decay into heat-carrying acoustic phonons, resulting in anomalously low thermal conductivity. Here, we studied this phonon via polarization-dependent terahertz spectroscopy. We observed softening of this mode with decreasing temperature, indicative of incipient ferroelectricity, which we explain through a model including strong anharmonicity with a quartic displacement term. In magnetic fields up to 25 T, the phonon mode splits into two modes with opposite handedness, exhibiting circular dichroism. Their frequencies display Zeeman splitting together with an overall diamagnetic shift with increasing magnetic field. Using a group-theoretical approach, we demonstrate that these observations are the result of magnetic field-induced morphic changes in the crystal symmetries through the Lorentz force exerted on the lattice ions. Thus, our study reveals a novel process of controlling phonon properties in a soft ionic lattice by a strong magnetic field. Copyright © 2021, The Authors. All rights reserved.

关键词： Magnetic fields

India's first robotic eye for time domain astrophysics: the GROWTH-India telescope

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arXiv 2022年

作者： Kumar, Harsh Bhalerao, Varun Anupama, G.C. Barway, Sudhanshu Basu, Judhajeet Deshmukh, Kunal De, Kishalay Dutta, Anirban Fremling, Christoffer Iyer, Hrishikesh Jassani, Adeem Joharle, Simran Karambelkar, Viraj Khandagale, Maitreya Krishna, K. Adithya Kulkarni, Sumeet Mate, Sujay Patil, Atharva Phanindra, D.V.S. Samantaray, Subham Sharma, Kritti Sharma, Yashvi Shenoy, Vedant Singh, Avinash Srivastava, Shubham Swain, Vishwajeet Waratkar, Gaurav Angchuk, Dorje Dorjay, Padma Dorjai, Tsewang Gyalson, Tsewang Jorphail, Sonam Mahay, Tashi Thsering Norbu, Rigzin Sharma, Tarun Kumar Stanzin, Jigmet Stanzin, Tsewang Stanzin, Urgain Department of Physics Indian Institute of Technology Bombay Powai400 076 India Indian Institute of Astrophysics 2nd Block 100 Feet Rd Koramangala Bangalore560 034 India Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay Powai Mumbai400076 India Department of Physics and Astronomy Texas Tech University PO Box 41051 LubbockTX79409 United States Division of Physics Mathematics and Astronomy California Institute of Technology PasadenaCA91125 United States MIT-Kavli Institute for Astrophysics and Space Research 77 Massachusetts Ave. CambridgeMA02139 United States Pondicherry University R.V. Nagar Kalapet Puducherry605014 India Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States Fergusson College Shivajinagar Maharashtra Pune411 004 India Heidelberg University Grabengasse 1 Heidelberg 691 17 Germany 204 Lewis Hall The University of Mississippi OxfordMS38677 United States Department of Astronomy and Astrophysics Tata Institute of Fundamental Research Mumbai400005 India Graduate Institute of Astronomy National Central University 32001 Taiwan Department of Mechanical Engineering Indian Institute of Technology Bombay Powai Mumbai400076 India Hiroshima Astrophysical Science Center Hiroshima University Hiroshima Higashi-Hiroshima739-8526 Japan Astrophysics Research Centre School of Mathematics and Physics Queen's University Belfast BelfastBT7 1NN United Kingdom 194 101 India Physikalisches Institut Universität zu Köln Zülpicher Strasse 77 Cologne50937 Germany

We present the design and performance of the GROWTH-India telescope, a 0.7 m robotic telescope dedicated to time domain astronomy. The telescope is equipped with a 4k back-illuminated camera gives a 0.82◦ field of view and a sensitivity of mg' ∼20.5 in 5-min exposures. Custom software handle observatory operations: attaining high on-sky observing efficiencies ( 80%) and allowing rapid response to targets of opportunity. The data processing pipelines are capable of performing PSF photometry as well as image subtraction for transient searches. We also present an overview of the GROWTH-India telescope's contributions to the studies of Gamma-ray Bursts, the electromagnetic counterparts to gravitational wave sources, supernovae, novae and solar system objects. Copyright © 2022, The Authors. All rights reserved.

关键词： Telescopes

Creating and manipulating a Laughlin-type ν = 1/3 fractional quantum Hall state on a quantum computer with linear depth circuits

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arXiv 2020年

作者： Rahmani, Armin Sung, Kevin J. Putterman, Harald Roushan, Pedram Ghaemi, Pouyan Jiang, Zhang Department of Physics and Astronomy and Advanced Materials Science and Engineering Center Western Washington University BellinghamWA98225 United States Kavli Institute for Theoretical Physics University of California Santa BarbaraCA93106 United States Google AI Quantum Santa BarbaraCA United States Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Physics Department City College of the City University of New York New YorkNY10031 United States Graduate Center of the City University of New York New YorkNY10016 United States

Here we present an efficient quantum algorithm to generate an equivalent many-body state to Laughlin’s ν = 1/3 fractional quantum Hall state on a digitized quantum computer. Our algorithm only uses quantum gates acting on neighboring qubits in a quasi one-dimensional setting, and its circuit depth is linear in the number of qubits, i.e., the number of Landau orbitals in the second quantized picture. We identify correlation functions that serve as signatures of the Laughlin state and discuss how to obtain them on a quantum computer. We also discuss a generalization of the algorithm for creating quasiparticles in the Laughlin state. This paves the way for several important studies, including quantum simulation of non-equilibrium dynamics and braiding of quasiparticles in quantum Hall states. Copyright © 2020, The Authors. All rights reserved.

关键词： Qubits

Unusual Formation of Point-Defect Complexes in the Ultrawide-Band-Gap Semiconductor β−Ga2O3

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Physical Review X 2019年第4期9卷 041027-041027页

作者： Jared M. Johnson Zhen Chen Joel B. Varley Christine M. Jackson Esmat Farzana Zeng Zhang Aaron R. Arehart Hsien-Lien Huang Arda Genc Steven A. Ringel Chris G. Van de Walle David A. Muller Jinwoo Hwang Department of Materials Science and Engineering The Ohio State University Columbus Ohio 43210 USA School of Applied and Engineering Physics Cornell University Ithaca New York 14853 USA Lawrence Livermore National Laboratory Livermore California 94550 USA Department of Electrical and Computer Engineering The Ohio State University Columbus Ohio 43210 USA Thermo Fisher Scientific Hillsboro Oregon 97124 USA Materials Department University of California Santa Barbara California 93106 USA Kavli Institute at Cornell for Nanoscale Science Cornell University Ithaca New York 14853 USA

Understanding the unique properties of ultra-wide band gap semiconductors requires detailed information about the exact nature of point defects and their role in determining the properties. Here, we report the first direct microscopic observation of an unusual formation of point defect complexes within the atomic-scale structure of β−Ga2O3 using high resolution scanning transmission electron microscopy (STEM). Each complex involves one cation interstitial atom paired with two cation vacancies. These divacancy-interstitial complexes correlate directly with structures obtained by density functional theory, which predicts them to be compensating acceptors in β−Ga2O3. This prediction is confirmed by a comparison between STEM data and deep level optical spectroscopy results, which reveals that these complexes correspond to a deep trap within the band gap, and that the development of the complexes is facilitated by Sn doping through increased vacancy concentration. These findings provide new insight on this emerging material’s unique response to the incorporation of impurities that can critically influence their properties.

关键词： Dopants Interstitials Point defects Vacancies

Synthetic dimension band structures on a Si CMOS photonic platform

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arXiv 2021年

作者： Balčytis, Armandas Ozawa, Tomoki Ota, Yasutomo Iwamoto, Satoshi Maeda, Jun Baba, Toshihiko Department of Electrical and Computer Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama240-8501 Japan Advanced Institute for Materials Research Tohoku University Sendai980-8577 Japan Institute for Nano Quantum Information Electronics The University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo153-8505 Japan Department of Applied Physics and Physico-Informatics Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan Research Center for Advanced Science and Technology The University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo153-8904 Japan Institute of Industrial Science The University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo153-8505 Japan

Synthetic dimensions, which simulate spatial coordinates using non-spatial degrees of freedom, are drawing interest in topological science and other fields for modelling higher-dimensional phenomena on simple structures. We present the first realization of a synthetic frequency dimension on a silicon ring resonator photonic device fabricated using a CMOS process. We confirm that its coupled modes correspond to a 1D tight-binding model through acquisition of up to 280 GHz bandwidth optical frequency comb-like spectra, and by measuring the first synthetic band structures on an integrated device. Furthermore, we realized two types of gauge potentials along the frequency dimension, and probed their effects through the associated band structures. An electric field analogue was produced via modulation detuning, whereas effective magnetic fields were induced using synchronized nearest- and second-nearest-neighbor coupling. Creation of coupled mode lattices and two effective forces on a monolithic Si CMOS device represents a key step towards wider adoption of topological principles. © 2021, CC BY.

关键词： Photonic devices

Assessing the Potential of GPT-4 to Annotate Medical Notes Across Different Languages and Countries: A Model Evaluation Study

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SSRN

SSRN 2024年

作者： Saad Menezes, Maria Clara Hoffman, Alexander F. Tan, Amelia L.M. Nalbandyan, Mariné Omenn, Gilbert S. Mazzotti, Diego R. Hernández-Arango, Alejandro Visweswaran, Shyam Venkatesh, Shruthi Mandl, Kenneth D. Bourgeois, Florence T. Lee, James W.K. Makmur, Andrew Hanauer, David A. Semanik, Michael G. Kerivan, Lauren T. Hill, Terra Forero, Julian Restrepo Castro, Carlos Andrés C.R. Vigna, Matteo Ceriana, Piero Abu-El-rub, Noor Avillach, Paul Bellazzi, Riccardo Callaci, Thomas Gutiérrez-Sacristán, Alba Malovini, Alberto Mathew, Jomol P. Morris, Michele Murthy, Venkatesh Parimbelli, Enea Patel, Lav P. Sáez, Carlos Samayamuthu, Malarkodi Jebathilagam Thompson, Jeffrey A. Tibollo, Valentina Xia, Zongqi Kohane, Isaac S. Harvard Medical School Department of Biomedical Informatics 10 Shattuck Street BostonMA02115 United States School of Medicine and Public Health University of Wisconsin-Madison Office of Informatics and Information Technology 750 Highland Ave MadisonWI53705 United States University of Michigan Department of Computational Medicine & Bioinformatics Internal Medicine Human Genetics Environmental Health 100 Washtenaw Avenue Ann ArborMI48109 United States University of Kansas Medical Center Division of Medical Informatics Division of Pulmonary Critical Care and Sleep Medicine Department of Internal Medicine 3901 Rainbow Blvd Kansas CityKS66160 United States University of Antioquia Hospital Alma Máter de Antioquia Department of Internal Medicine Calle 64 N°51 D - 154 Medellín Colombia University of Pittsburgh Department of Biomedical Informatics 5607 Baum Blvd PittsburghPA15206 United States University of Pittsburgh Department of Neurology 3501 5th Avenue PittsburghPA15206 United States Boston Children's Hospital Computational Health Informatics Program 300 Longwood Avenue BostonMA02115 United States Boston Children's Hospital Department of Pediatrics 300 Longwood Avenue BostonMA02115 United States National University Health System Department of Surgery 1E Kent Ridge Rd Singapore119228 Singapore National University Health System Department of Diagnostic Imaging 1E Kent Ridge Rd Singapore119228 Singapore University of Michigan Department of Learning Health Sciences NCRC 100 2800 Plymouth Road Ann ArborMI48109 United States University of Kansas Medical Center Department of Surgery 3901 Rainbow Blvd Kansas CityKS66160 United States Istituti Clinici Scientifici Maugeri IRCCS Respiratory rehabilitation unit Via Maugeri 10 Pavia27100 Italy University of Kansas Medical Center 3901 Rainbow Blvd Kansas CityKS66160 United States University of Pavia Department of Electrical Computer and Biomedical Engineering via Ferrata 5 Pavia2710

Background: Physicians invest hours creating patient notes, which are rich in information but difficult for computers to analyze due to their unstructured format. GPT-4 reshaped our ability to process text, yet it is unknown how well this model can handle medical notes. This project aims to compare GPT-4’s ability to annotate medical notes against experienced physicians across three different languages at multiple institutions and countries. Methods: This study included eight sites from four countries - the United States, Colombia, Singapore, and Italy. Each site contributed seven de-identified notes (admission, progress, or consult) from hospitalized patients. GPT-4 assessed each note by answering 14 questions, including demographic information, clinical judgments, data quality, and patients’ eligibility for a hypothetical study enrollment. For validation, two physicians from each site independently evaluated GPT-4's responses. Findings: Overall, 56 medical notes, written in English, Italian, and Spanish, were analyzed. A total of 784 responses from GPT-4 were generated. Both physicians agreed with GPT-4’s response 79% of the time (622/784, 95%CI 76-82%). Only one of the two physicians agreed with GPT-4’s response 10% of the time (82/784, 95%CI 8-13%). Neither physician agreed with GPT-4’s response 10% of the time (80/784, 95%CI 8-13%). Both physicians agreed with GPT-4 more often in notes written in Spanish and Italian than in English, with agreement rates of 88% (86/98, 95%CI 79-93%), 84% (82/98, 95%CI 75-90%), and 77% (454/588, 95%CI 74-80%), respectively. Hallucinations were rare (10/784, 95%CI 0-2%). GPT-4 correctly selected patients for a hypothetical study enrollment based on three criteria 90% of the time (95%CI 81-98%). Interpretation: The findings indicate that GPT-4 annotations demonstrated a high agreement rate with physicians across all languages. We also demonstrate GPT-4's potential to assist in patient selection for studies. Funding: None. Declarati

关键词： Medical computing