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arXiv 2019年

作者： Li, Zhipeng Wang, Tianmeng Jin, Chenhao Lu, Zhengguang Lian, Zhen Meng, Yuze Blei, Mark Gao, Mengnan Taniguchi, Takashi Watanabe, Kenji Ren, Tianhui Cao, Ting Tongay, Sefaattin Smirnov, Dmitry Zhang, Lifa Shi, Su-Fei School of Chemistry and Chemical Engineering Key Laboratory for Thin Film and Micro Fabrication of the Ministry of Education Shanghai Jiao Tong University Shanghai200240 China Department of Chemical and Biological Engineering Rensselaer Polytechnic Institute TroyNY12180 United States Kavli Institute at Cornell for Nanoscale Science IthacaNY14853 National High Magnetic Field Lab TallahasseeFL32310 United States Department of Physics Florida State University TallahasseeFL32306 United States College of Physics Nanjing University NanjingP. R.210093 China National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85287 United States Geballe Laboratory for Advanced Materials Stanford University StanfordCA94305 United States Department of Materials Science and Engineering University of Washington SeattleWA98195 United States Center for Quantum Transport and Thermal Energy Science School of Physics and Technology Nanjing Normal University Nanjing210023 China Department of Electrical Computer & Systems Engineering Rensselaer Polytechnic Institute TroyNY12180 United States

Inversion symmetry breaking and three-fold rotation symmetry grant the valley degree of freedom to the robust exciton in monolayer transition metal dichalcogenides (TMDCs), which can be exploited for valleytronics applications. However, the short lifetime of the exciton significantly constrains the possible applications. In contrast, dark exciton could be long-lived but does not necessarily possess the valley degree of freedom. In this work, we report the identification of the momentum-dark, intervalley exciton in monolayer WSe2 through low-temperature magneto-photoluminescence (PL) spectra. Interestingly, the intervalley exciton is brightened through the emission of a chiral phonon at the corners of the Brillouin zone (K point), and the pseudoangular momentum (PAM) of the phonon is transferred to the emitted photon to preserve the valley information. The chiral phonon energy is determined to be ~ 23 meV, based on the experimentally extracted exchange interaction (~ 7 meV), in excellent agreement with the theoretical expectation of 24.6 meV. The long-lived intervalley exciton with valley degree of freedom adds an exciting quasiparticle for valleytronics, and the coupling between the chiral phonon and intervalley exciton furnishes a venue for valley spin manipulation. Copyright © 2019, The Authors. All rights reserved.

关键词： Phonons

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1A study on big data I/O performance with modern storage systems

1A study on big data I/O performance with modern storage sys...

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IEEE International Conference on Big Data

作者： Kenji Nakashima Joichiro Kon Saneyasu Yamaguchi Gil Jae Lee José Fortes Electrical Engineering and Electronics Kogakuin University Graduate School Tokyo Japan Advanced Computer and Information Systems (ACIS) Lab University of Florida Gainesville USA

High-performance I/O is essential for big-data analyses. Modern storage systems utilize HDDs and SSDs mainly for achieving large capacity and high performance, respectively. Using an SSD as a cache for accesses to HDDs is one of the promising methods for improving large-scale I/O performance in modern computers. In addition, M.2 is increasing its importance in high-performance I/O processing. In this paper, we investigate the I/O performance of storage systems including M.2 SSD and SSD cache. Our experimental results show that big-data processing performance can improve significantly by using an M.2 SSD cache.

关键词： Performance evaluation Big Data computers Hard disks Solids Information management Conferences

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Theoretical Bound of CRLB for Energy Efficient Technique of RSS-Based Factor Graph Geolocation

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IOP Conference Series: Earth and Environmental Science 2018年第1期124卷

作者： Muhammad Reza Kahar Aziz Heriansyah EfaMaydhona Saputra Ardiansyah Musa Electrical Engineering Department InstitutTeknologi Sumatera Lampung Selatan INDONESIA Advanced Network Lab. School of Electronics & Computer Engineering Chonnam National University Gwangju SOUTH KOREA

To support the increase of wireless geolocation development as the key of the technology in the future, this paper proposes theoretical bound derivation, i.e., Cramer Rao lower bound (CRLB) for energy efficient of received signal strength (RSS)-based factor graph wireless geolocation technique. The theoretical bound derivation is crucially important to evaluate whether the energy efficient technique of RSS-based factor graph wireless geolocation is effective as well as to open the opportunity to further innovation of the technique. The CRLB is derived in this paper by using the Fisher information matrix (FIM) of the main formula of the RSS-based factor graph geolocation technique, which is lied on the Jacobian matrix. The simulation result shows that the derived CRLB has the highest accuracy as a bound shown by its lowest root mean squared error (RMSE) curve compared to the RMSE curve of the RSS-based factor graph geolocation technique. Hence, the derived CRLB becomes the lower bound for the efficient technique of RSS-based factor graph wireless geolocation.

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Rapid ultrasound-induced transient-liquid-phase bonding of aluminum-based materials in air for lightweight structure design

Rapid ultrasound-induced transient-liquid-phase bonding of a...

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第七届焊接科学与工程国际会议(WSE 2017)暨第三届计算机辅助焊接工程国际研讨会(CAWE 2017)

作者： Qian Wang Lin Zhu Jiuchun Yan Yuntao Li Xiaoyu Zhou Shengyong Chen School of Materials Science and Engineering Tianjin University of Technology State Key Lab of Advanced Welding and Joining Harbin Institute of Technology School of Computer and Communication Engineering Tianjin University of Technology

Conventional transient-liquid-phase bonding technologies often require vacuum atmosphere and intensive time. As a result, the application of TLP bonding in high-performance lightweight metal fabrications is limited, as is the case for joining Aluminum-based materials. In the present study, the inherent advantages of rapid ultrasound-induced transient-liquid-phase bonding approach was shown, aluminum-based materials were joining in air and the order of time was reduced to seconds. To extend TLP bonding to hypereutectic Al-Si alloys, we use a volatile interlayer of Zn foil between Al-50 Si alloys, and the ultrasound-induced transient-liquid-phase bonding processes were carried out at 390 °C in air. The fracture of oxide films along the edge of Si particles led to contact and inter-diffusion between aluminum substrate and Zn interlayer, and liquefied Zn-Al alloys were developed. The width of Zn-Al alloys gradually decreased with increasing the ultrasonic vibration time due to liquid squeezing out and accelerated diffusion. A stage of isothermal solidification existed, and the completion time was significantly shortened. In the liquid metal, the acoustic streaming and ultrasonic cavitations were induced. As the processes developed, much more Si particles, which were particulate-reinforced phases of Al-50 Si, gradually migrated to the center of soldering seam. The highest average shear strength of joints reached to 94.2 MPa, and the fracture mainly occurred at the base metal.

关键词： Rapid ultrasound-induced TLPB Aluminum-based materials Microstructures Mechanical properties

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CovidCTNet: An open-source deep learning approach to identify Covid-19 using CT image

arXiv

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arXiv 2020年

作者： Javaheri, Tahereh Homayounfar, Morteza Amoozgar, Zohreh Reiazi, Reza Homayounieh, Fatemeh Abbas, Engy Laali, Azadeh Radmard, Amir Reza Gharib, Mohammad Hadi Mousavi, Seyed Ali Javad Ghaemi, Omid Babaei, Rosa Mobin, Hadi Karimi Hosseinzadeh, Mehdi Jahanban-Esfahlan, Rana Seidi, Khaled Kalra, Mannudeep K. Zhang, Guanglan Chitkushev, L.T. Haibe-Kains, Benjamin Malekzadeh, Reza Rawassizadeh, Reza Health Informatics Lab Metropolitan College Boston University Boston United States Department of Biomedical Engineering Amirkabir University of Technology Tehran Iran Department of Radiation Oncology Massachusetts General Hospital Harvard Medical School Boston United States Princess Margaret Cancer Centre University of Toronto Toronto Canada Department of Medical Biophysics University of Toronto Toronto Canada Department of Medical Physics School of Medicine Iran university of Medical Sciences Department of Radiology Massachusetts General Hospital Harvard Medical School Boston United States Joint Department of Medical Imaging University of Toronto Toronto Canada Department of Infectious Diseases Firoozgar Hospital Iran University of Medical Sciences Tehran Iran Department of Radiology Shariati Hospital Tehran University of Medical Sciences Tehran Iran Department of Radiology Gloestan Rheumatology Research Center Golestan University of Medical Sciences Gorgan Iran Department of Internal Medicine Iran University of Medical Sciences Tehran Iran Department of Radiology Iran University of Medical Sciences Tehran Iran Institute of Research and Development Duy Tan University Da Nang550000 Viet Nam Health Management and Economics Research Center Iran University of Medical Sciences Tehran Iran Department of Medical Biotechnology School of Advanced Medical Sciences Tabriz University of Medical Sciences Tabriz Iran Department of Computer Science Metropolitan College Boston University Boston United States Department of Computer Science University of Toronto TorontoON Canada Ontario Institute for Cancer Research TorontoON Canada Vector Institute for Artificial Intelligence TorontoON Canada Digestive Disease Research Center Tehran University of Medical Sciences Tehran Iran

Coronavirus disease 2019 (Covid-19) is highly contagious with limited treatment options. Early and accurate diagnosis of Covid-19 is crucial in reducing the spread of the disease and its accompanied mortality. Currently, detection by reverse transcriptase polymerase chain reaction (RT-PCR) is the gold standard of outpatient and inpatient detection of Covid-19. RT-PCR is a rapid method, however, its accuracy in detection is only ~70-75%. Another approved strategy is computed tomography (CT) imaging. CT imaging has a much higher sensitivity of ~80-98%, but similar accuracy of 70%. To enhance the accuracy of CT imaging detection, we developed an open-source set of algorithms called CovidCTNet that successfully differentiates Covid-19 from community-acquired pneumonia (CAP) and other lung diseases. CovidCTNet increases the accuracy of CT imaging detection to 90% compared to radiologists (70%). The model is designed to work with heterogeneous and small sample sizes independent of the CT imaging hardware. In order to facilitate the detection of Covid-19 globally and assist radiologists and physicians in the screening process, we are releasing all algorithms and parametric details in an open-source format. Open-source sharing of our CovidCTNet enables developers to rapidly improve and optimize services, while preserving user privacy and data ownership. Copyright © 2020, The Authors. All rights reserved.

关键词： Coronavirus

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Efficient Discovery of Optimal N-Layered TMDC Hetero-Structures

Efficient Discovery of Optimal N-Layered TMDC Hetero-Structu...

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MRS Advances

作者： Bassman, Lindsay Rajak, Pankaj Kalia, Rajiv K. Nakano, Aiichiro Sha, Fei Aykol, Muratahan Huck, Patrick Persson, Kristin Sun, Jifeng Singh, David J. Vashishta, Priya Collaboratory for Advanced Computing and Simulations University of Southern California Los AngelesCA90089 United States Department of Physics University of Southern California Los AngelesCA90089 United States Department of Computer Science University of Southern California Los AngelesCA90089 United States Department of Chemical Engineering and Material Science University of Southern California Los AngelesCA90089 United States Department of Biological Sciences University of Southern California Los AngelesCA90089 United States Lawrence Berkeley National Lab 1 Cyclotron Rd BerkeleyCA94720 United States Department of Physics and Astronomy University of Missouri ColumbiaMO65211 United States

Vertical hetero-structures made from stacked monolayers of transition metal dichalcogenides (TMDC) are promising candidates for next-generation optoelectronic and thermoelectric devices. Identification of optimal layered materials for these applications requires the calculation of several physical properties, including electronic band structure and thermal transport coefficients. However, exhaustive screening of the material structure space using ab initio calculations is currently outside the bounds of existing computational resources. Furthermore, the functional form of how the physical properties relate to the structure is unknown, making gradient-based optimization unsuitable. Here, we present a model based on the Bayesian optimization technique to optimize layered TMDC hetero-structures, performing a minimal number of structure calculations. We use the electronic band gap and thermoelectric figure of merit as representative physical properties for optimization. The electronic band structure calculations were performed within the Materials Project framework, while thermoelectric properties were computed with BoltzTraP. With high probability, the Bayesian optimization process is able to discover the optimal hetero-structure after evaluation of only ∼20% of all possible 3-layered structures. In addition, we have used a Gaussian regression model to predict not only the band gap but also the valence band maximum and conduction band minimum energies as a function of the momentum. Copyright © Materials Research Society 2018.

关键词： Electronic structure

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Bidirectional controlled quantum teleportation using eight-qubit quantum channel in noisy environments

arXiv

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arXiv 2018年

作者： Sarvaghad-Moghaddam, Moein Ramezani, Zeinab Amiri, Is Quantum Design Automation Lab Amirkabir University of Technology Tehran Iran Department of Electrical and Computer Engineering Northeastern University BostonMA02115 United States Computational Optics Research Group Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Viet Nam

In this work, a novel protocol is proposed for bidirectional controlled quantum teleportation (BCQT) in which a quantum channel is used with the eight-qubit entangled state. Using the protocol, two users can teleport an arbitrary entangled state and a pure two-qubit state (QBS) to each other simultaneously under the permission of a third party in the role of controller. This protocol is based on the controlled-not operation, appropriate single-qubit (SIQ) UOs and SIQ measurements in the .. and ..-basis. Reduction of the predictability of the controllerfs qubit (QB) by the eavesdropper and also, an increasing degree of freedom of controller for controlling one of the users or both are other features of this protocol. Then, the proposed protocol is investigated in two typical noisy channels include the amplitude-damping noise (ADN) and the phase-damping noise (PDN). And finally, analysis of the protocol shows that it only depends on the amplitude of the initial state and the decoherence noisy rate (DR). Copyright © 2018, The Authors. All rights reserved.

关键词： Degrees of freedom (mechanics)

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CEPC Technical Design Report

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Radiation Detection Technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai Yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-Jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai Huacheng Cai Lorenzo Calibbi Junsong Cang Guofu Cao Jianshe Cao Antoine Chance Xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin Chen Danping Chen Fuqing Chen Fusan Chen Gang Chen Guoming Chen Hua-Xing Chen Huirun Chen Jinhui Chen Ji-Yuan Chen Kai Chen Mali Chen Mingjun Chen Mingshui Chen Ning Chen Shanhong Chen Shanzhen Chen Shao-Long Chen Shaomin Chen Shiqiang Chen Tianlu Chen Wei Chen Xiang Chen Xiaoyu Chen Xin Chen Xun Chen Xurong Chen Ye Chen Ying Chen Yukai Chen Zelin Chen Zilin Chen Gang Chen Boping Chen Chunhui Chen Hok Chuen Cheng Huajie Cheng Shan Cheng Tongguang Cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi Ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev Tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong Jianin AGH University of Science and Technology Faculty of Physics and Applied Computer ScienceKrakow Anhui University HefeiAnhui Applied Physics Department Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu University Institute of ScienceVaranasi Bandirma Onyedi Eylul University Bandirma Beihang University Beijing Beijing Computational Science Research Center Beijing Beijing Conveyi LTD Beijing Beijing Glass Research Institute Co. LtdBeijing Beijing Institute of Technology Beijing Beijing Normal University Beijing Brown University ProvidenceRI Budker Institute of Nuclear Physics Novosibirsk Cadi Ayyad University Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech Cairo University Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central China Normal University WuhanHubei Central South University ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa Chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan China academy of engineering physics MianyangSichuan China building materials academy Beijing China Center of Advanced Science and Technology Beijing China Institute of Atomic Energy Beijing China Jiliang University HangzhouZhejiang China Nuclear Instrument CO. LTDBeijing China University of Geosciences Beijing China University of Geosciences WuhanHubei China University of Mining and Technology XuzhouJiangsu China West Normal University NanchongSichuan Chongqing University Department of PhysicsChongqing Chulalongkorn University Bangkok City University of Hong Kong Department of PhysicsHong Kong Cockcroft Institute Daresbury Cornell University IthacaNY CPPM(AMU/IPhU&CNRS/INP) Marseille Dalian Minzu University DalianLiaoning Dalian University of Technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov Laboratory of Nuclear Problems of Joint Institute for Nuclear Research(DLNP JINR) Dubna East China University Of Science And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international *** complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2015)and the Conceptual Design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection *** is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2030s.

关键词： initiated exceeding precise

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Illumination insensitive efficient second-order minimization for planar object tracking

Illumination insensitive efficient second-order minimization...

引用

2017 IEEE International Conference on Robotics and Automation, ICRA 2017

作者： Chen, Lin Zhou, Fan Shen, Yu Tian, Xiang Ling, Haibin Chen, Yaowu Institute of Advanced Digital Technology and Instrument Zhejiang University China Key Laboratory for Biomedical Engineering Ministry of Education of China Zhejiang University China Meitu HiScene Lab HiScene Information Technologies Shanghai China Zhejiang Provincial Key Laboratory for Network Multimedia Technologies Hangzhou China Computer and Information Sciences Department Temple University United States

ISBN: (纸本)9781509046331

Tracking for planar objects is an important issue to vision-based robotic applications. In direct visual tracking (DVT) methods, the similarity between two images is often measured through the sum of squared differences (SSD) especially with the efficient second-order minimization (ESM) due to its simplicity and efficiency. However, SSD-based ESM is not robust to illumination changes since it is usually built upon the brightness constancy assumption. Contrast to image brightness, gradient orientations (GO) are invariant to both linear and non-linear illumination changes as verified in practice. Based on GO, we propose an illumination insensitive ESM method for planar object tracking in this paper. In order to introduce GO into the ESM, we generalized the original ESM formulas for multi-dimensional features. In addition, a denoising method based on the Perona-Malik function and a mask image were suggested to improve GO's robustness against image noise and low texture. Our experimental results on dataset for planar objects with illumination changes and a benchmark dataset confirm the proposed method is robust to illumination variations and capable to deal with the general tracking challenges. © 2017 IEEE.

关键词： Textures

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Topological Transitions Induced by Antiferromagnetism in a Thin-Film Topological Insulator

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Physical Review Letters 2018年第9期121卷 096802-096802页

作者： Qing Lin He Gen Yin Luyan Yu Alexander J. Grutter Lei Pan Chui-Zhen Chen Xiaoyu Che Guoqiang Yu Bin Zhang Qiming Shao Alexander L. Stern Brian Casas Jing Xia Xiaodong Han Brian J. Kirby Roger K. Lake K. T. Law Kang L. Wang Department of Electrical Engineering University of California Los Angeles California 90095 USA International Center for Quantum Materials Peking University Beijing 100871 China NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland 20899-6102 USA Department of Physics Hong Kong University of Science and Technology Clear Water Bay Hong Kong China Beijing Key Lab of Microstructure and Property of Advanced Materials Beijing University of Technology 100124 Beijing China Department of Physics and Astronomy University of California Irvine California 92697 USA Laboratory for Terascale and Terahertz Electronics (LATTE) Department of Electrical and Computer Engineering University of California Riverside Riverside California 92521 USA

Magnetism in topological insulators (TIs) opens a topologically nontrivial exchange band gap, providing an exciting platform for manipulating the topological order through an external magnetic field. Here, we show that the surface of an antiferromagnetic thin film can magnetize the top and the bottom TI surface states through interfacial couplings. During the magnetization reversal, intermediate spin configurations are ascribed from unsynchronized magnetic switchings. This unsynchronized switching develops antisymmetric magnetoresistance spikes during magnetization reversals, which might originate from a series of topological transitions. With the high Néel ordering temperature provided by the antiferromagnetic layers, the signature of the induced topological transition persists up to ∼90 K.

关键词： Antiferromagnetism Magnetic interactions Magnetization switching Topological materials Topological phases of matter Topological insulators

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