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Experimental Demonstration of a Bilayer Thermal Cloak

Physical Review Letters 2014年第5期112卷 054302-054302页

作者： Tiancheng Han Xue Bai Dongliang Gao John T. L. Thong Baowen Li Cheng-Wei Qiu Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117583 Republic of Singapore Department of Physics and Centre for Computational Science and Engineering National University of Singapore Singapore 117546 Republic of Singapore NUS Graduate School for Integrative Sciences and Engineering National University of SingaporeKent Ridge 119620 Republic of Singapore Center for Phononics and Thermal Energy Science School of Physics Science and Engineering Tongji University 200092 Shanghai China

Invisibility has attracted intensive research in various communities, e.g., optics, electromagnetics, acoustics, thermodynamics, dc, etc. However, many experimental demonstrations have only been achieved by virtue of simplified approaches due to the inhomogeneous and extreme parameters imposed by the transformation-optic method, and usually require a challenging realization with metamaterials. In this Letter, we demonstrate a bilayer thermal cloak made of bulk isotropic materials, and it has been validated as an exact cloak. We experimentally verified its ability to maintain the heat front and its heat protection capabilities in a 2D proof-of-concept experiment. The robustness of this scheme is validated in both 2D (including oblique heat front incidence) and 3D configurations. The proposed scheme may open a new avenue to control the diffusive heat flow in ways inconceivable with phonons, and also inspire new alternatives to the functionalities promised by transformation optics.

关键词： CLOAKING devices BILAYERS (Solid state physics) BULK solids HEAT transfer PHONONS EXPERIMENTAL design

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Identifying drug (cocaine) intake events from acute physiological response in the presence of free-living physical activity

Identifying drug (cocaine) intake events from acute physiolo...

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International Symposium on Information Processing in Sensor Networks (IPSN)

作者： Syed Monowar Hossain Amin Ahsan Ali Md. Mahbubur Rahman Emre Ertine David Epstein Ashley Kennedy Kenzie Preston Annie Umbricht Yixin Chen Santosh Kumar Dept. of Computer Science University of Memphis Dept of Electrical & Computer Engineering Ohio State University NIDA Intramural Research Program Dept. of Psychiatry and Behavioral Sciences Johns Hopkins University Dept of Computer Science and Engg. Washington University in St. Louise

A variety of health and behavioral states can potentially be inferred from physiological measurements that can now be collected in the natural free-living environment. The major challenge, however, is to develop computational models for automated detection of health events that can work reliably in the natural field environment. In this paper, we develop a physiologically-informed model to automatically detect drug (cocaine) use events in the free-living environment of participants from their electrocardiogram (ECG) measurements. The key to reliably detecting drug use events in the field is to incorporate the knowledge of autonomic nervous system (ANS) behavior in the model development so as to decompose the activation effect of cocaine from the natural recovery behavior of the parasympathetic nervous system (after an episode of physical activity). We collect 89 days of data from 9 active drug users in two residential lab environments and 922 days of data from 42 active drug users in the field environment, for a total of 11,283 hours. We develop a model that tracks the natural recovery by the parasympathetic nervous system and then estimates the dampening caused to the recovery by the activation of the sympathetic nervous system due to cocaine. We develop efficient methods to screen and clean the ECG time series data and extract candidate windows to assess for potential drug use. We then apply our model on the recovery segments from these windows. Our model achieves 100% true positive rate while keeping the false positive rate to 0.87/day over (9+ hours/day of) lab data and to 1.13/day over (11+ hours/day of) field data.

关键词： Drugs Sensors Electrocardiography Physiology Data models Heart rate Reliability

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Room Temperature Frenkel-Wannier-Mott Hybridization of Degenerate Excitons in a Strongly Coupled Microcavity

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Physical Review Letters 2014年第7期112卷 076401-076401页

作者： Michael Slootsky Xiaoze Liu Vinod M. Menon Stephen R. Forrest Department of Physics University of Michigan Ann Arbor Michigan 48109 USA Department of Physics Graduate Center and Department of Physics Queens College City University of New York New York New York 11367 USA Department of Electrical Engineering and Computer Science and Department of Materials Science and Engineering University of Michigan Ann Arbor Michigan 48109 USA

Hybrid organic-inorganic polaritons are formed by the simultaneous strong coupling of two degenerate excitons and a microcavity photon at room temperature. Wannier-Mott and Frenkel excitons in spatially separated ZnO and 3,4,7,8-napthalene tetracarboxylic dianhydride (NTCDA) layers, respectively, placed in a single Fabry-Perot microcavity contribute to the interaction with the cavity. A Rabi splitting of (322±8) meV between the upper and middle branches of the three branch polariton energy-momentum dispersion is observed. This is compared to only (224±22) meV and (218±8) meV Rabi splittings for NTCDA-only and ZnO-only reference cavities, respectively, and indicates that the excitonic component of the polariton is a Frenkel-Wannier-Mott hybrid. Unlike previous reports of hybrid polaritons, the mixing of the organic and inorganic eigenstates occurs independently of angle due to their energetic degeneracy, and can be tailored by adjusting the optical field distribution within the cavity.

关键词： ORBITAL hybridization (Chemistry) EXCITON theory POLARITONS DISPERSION relations COULOMB functions

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Scattering assisted launch of SPR modes in Au films

Scattering assisted launch of SPR modes in Au films

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Optical Sensors, 2014

作者： Canning, J. Karim, A. Tzoumis, N. Tan, Y. Patyk, R. Trimby, P. Interdisciplinary Photonics Laboratories School of Chemistry The University of Sydney 222 Madsen Building F09 Sydney2006 Australia Institute of Photonics Technology Jinan University Guangzhou510632 China Graduate School of Electrical Engineering and Applied Computer Science Federal University of Technology-Paraná Curitiba PR80230-901 Brazil The University of Sydney Sydney2006 Australia

ISBN: (纸本)9781557528209

We report the excitation of a surface plasmon resonance (SPR) close to the orthogonal axis of a gold (Au) film on borosilicate glass. The need for prisms is removed simplifying the practical requirements for photonic devices and sensors. Spectroscopic measurement of SPR spectral shifts ~5o incidence within a reflection spectrophotometer for two liquids are taken. © 2014 OSA.

关键词： Surface plasmon resonance

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A method for identifying distribution pattern of cone cells in retina image

A method for identifying distribution pattern of cone cells ...

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Proceedings of the Biannual World Automation Congress

作者： Ken'ichi Morooka Yuanting Ji Oscar Martinez Mozos Tokuo Tsuji Ryo Kurazume Peter K. Ahnelt Graduate School of Information Science and Electrical Engineering Kyushu University Fukuoka Japan School of Computer Science University of Lincoln Lincoln United Kingdom Dept. Neurophysiology and Neuropharmacology Medical University of Vienna Vienna Austria

This paper proposes a method to identify the spatial distribution patterns of cone cells related with blood vessel in a given retina image. We define three types of the distribution patterns between cones and vessels. Positive correlation distribution (PCD) and negative correlation distribution (NCD) indicate that the cones tend to be close to or far from the vessels. While the cone cells do not have significant correlation with vessels, the cone distribution is regarded as the random distribution (RD). In our method, RD is modeled by many virtual retina images, each of which is generated by the vessels extracted from the original retina image and the virtual cells are selected randomly from the image. Using the virtual images, we estimate the distribution range of RD. When the distribution of the original cells is above the upper limit or below the lower limit of the RD distribution, the cell distribution is NCD or PCD. Otherwise, the cell distribution is regarded as RD.

关键词： Correlation Biology Image resolution

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Transient Eletronics: Biodegradable Thin Metal Foils and Spin‐On Glass Materials for Transient Electronics (Adv. Funct. Mater. 12/2015)

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Advanced Functional Materials 2015年第12期25卷

作者： Seung‐Kyun Kang Suk‐Won Hwang Sooyoun Yu Jung‐Hun Seo Elise A. Corbin Jiho Shin Dae Seung Wie Rashid Bashir Zhenqiang Ma John A. Rogers Department of Materials Science and Engineering Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana IL 61801 USA KU‐KIST Graduate School of Converging Science and Technology Korea University Seoul 136‐701 Korea Department of Chemical and Biomolecular Engineering University of Illinois at Urbana‐Champaign Urbana IL 61801 USA Department of Electrical and Computer Engineering University of Wisconsin‐Madison Madison WI 53706 USA Department of Bioengineering University of Illinois at Urbana‐Champaign Urbana IL 61801 USA Department of Chemistry Mechanical Science and Engineering and Department of Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology University of Illinois at Urbana‐Champaign Urbana IL 61801 USA

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A simple relay selection algorithm in multi user OFDM based cooperative CR networks

A simple relay selection algorithm in multi user OFDM based ...

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International Symposium on Telecommunications, IST

作者： Ahmad Farjami Vahid Tabataba Vakili Shahriar Shirvani Moghaddam Faculty of Graduate Studies Islamic Azad University (IAU) Tehran Iran School of Electrical Engineering Iran University of Science and Technology (IUST) Narmak Tehran Iran Faculty of Electrical and Computer Engineering Shahid Rajaee Teacher Training University (SRTTU) Lavizan Tehran Iran

This paper presents a simple relay selection algorithm in multiuser orthogonal frequency-division multiplexing (MU-OFDM) cooperative Cognitive Radio (CR) networks to enhance normalized sum capacity of secondary users (SUs). After simplifying three node relay network to its equivalent two node network with equivalent gain on each subcarrier, a simple method for relay selection is used which considers interference on primary users. In addition simple relay selection algorithm proposed. This simple algorithm selects the relay-node for each source-node by a fixed power allocation on all subcarriers (SCs) in independent phase before joint subcarrier and power allocation algorithm are performed. Simulation results demonstrate that this relay selection algorithm can significantly enhance normalized sum capacity of SUs compared to random relay selection algorithm.

关键词： Relays Resource management Cognitive radio OFDM Joints Signal to noise ratio

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An algorithm for computing all-terminal reliability bounds

An algorithm for computing all-terminal reliability bounds

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International Workshop on Reliable Networks Design and Modeling (RNDM)

作者： Jaime Silva Teresa Gomes David Tipper Lúcia Martins Velin Kounev Department of Physics CFC University of Coimbra Coimbra Portugal INESC Coimbra Coimbra Portugal Department of Electrical and Computer Engineering University of Coimbra Coimbra Portugal Graduate Telecommunications and Networking Program University of Pittsburgh Pittsburgh PA

The exact calculation of all-terminal reliability is not feasible in large networks. Hence estimation techniques and lower and upper bounds for all-terminal reliability have been utilized. We propose using an ordered subset of the mincuts and an ordered subset of minpaths to calculate an all-terminal reliability upper and lower bound, respectively. The advantage of the proposed approach results from the fact that it does not require the enumeration of all mincuts or all minpaths as required by other bounds. The performance of the algorithm is compared with the first two Bonferroni bounds, for networks where all mincuts could be calculated. The results show that the proposed approach is computationally feasible and reasonably accurate. Thus allowing one to obtain bounds when it not possible to enumerate all mincuts or all minpaths.

关键词： Availability Probability Telecommunication network reliability Upper bound computer network reliability Reliability engineering

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Erratum to: Measurement of the W boson polarisation in [Formula: see text] events from pp collisions at [Formula: see text] in the lepton + jets channel with ATLAS

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The European physical journal. C, Particles and fields 2019年第1期79卷 19页

作者： M Aaboud G Aad B Abbott J Abdallah O Abdinov B Abeloos O S AbouZeid N L Abraham H Abramowicz H Abreu R Abreu Y Abulaiti B S Acharya S Adachi L Adamczyk D L Adams J Adelman S Adomeit T Adye A A Affolder T Agatonovic-Jovin J A Aguilar-Saavedra S P Ahlen F Ahmadov G Aielli H Akerstedt T P A Åkesson A V Akimov G L Alberghi J Albert S Albrand M J Alconada Verzini M Aleksa I N Aleksandrov C Alexa G Alexander T Alexopoulos M Alhroob B Ali M Aliev G Alimonti J Alison S P Alkire B M M Allbrooke B W Allen P P Allport A Aloisio A Alonso F Alonso C Alpigiani A A Alshehri M Alstaty B Alvarez Gonzalez D Álvarez Piqueras M G Alviggi B T Amadio Y Amaral Coutinho C Amelung D Amidei S P Amor Dos Santos A Amorim S Amoroso G Amundsen C Anastopoulos L S Ancu N Andari T Andeen C F Anders J K Anders K J Anderson A Andreazza V Andrei S Angelidakis I Angelozzi A Angerami F Anghinolfi A V Anisenkov N Anjos A Annovi C Antel M Antonelli A Antonov D J Antrim F Anulli M Aoki L Aperio Bella G Arabidze Y Arai J P Araque V Araujo Ferraz A T H Arce F A Arduh J-F Arguin S Argyropoulos M Arik A J Armbruster L J Armitage O Arnaez H Arnold M Arratia O Arslan A Artamonov G Artoni S Artz S Asai N Asbah A Ashkenazi B Åsman L Asquith K Assamagan R Astalos M Atkinson N B Atlay K Augsten G Avolio B Axen M K Ayoub G Azuelos M A Baak A E Baas M J Baca H Bachacou K Bachas M Backes M Backhaus P Bagiacchi P Bagnaia Y Bai J T Baines M Bajic O K Baker E M Baldin P Balek T Balestri F Balli W K Balunas E Banas Sw Banerjee A A E Bannoura L Barak E L Barberio D Barberis M Barbero T Barillari M-S Barisits T Barklow N Barlow S L Barnes B M Barnett R M Barnett Z Barnovska-Blenessy A Baroncelli G Barone A J Barr L Barranco Navarro F Barreiro J Barreiro Guimarães da Costa R Bartoldus A E Barton P Bartos A Basalaev A Bassalat R L Bates S J Batista J R Batley M Battaglia M Bauce F Bauer H S Bawa J B Beacham M D Beattie T Beau P H Beauchemin P Bechtle H P Beck K Becker M Becker M Beckingham C Becot A J Beddall A Beddall V A Bednyakov M Bedognetti C P Bee L J Beemster T A Bee 180Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco. 115CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France. 144Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman OK USA. 10Department of Physics The University of Texas at Arlington Arlington TX USA. Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan. 148LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France. 183Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz CA USA. 199Department of Physics and Astronomy University of Sussex Brighton UK. 203Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel. 202Department of Physics Technion: Israel Institute of Technology Haifa Israel. 147Center for High Energy Physics University of Oregon Eugene OR USA. 195Department of Physics Stockholm University Stockholm Sweden. 196The Oskar Klein Centre Stockholm Sweden. 217INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy. 218ICTP Trieste Italy. 205International Center for Elementary Particle Physics and Department of Physics The University of Tokyo Tokyo Japan. 60Faculty of Physics and Applied Computer Science AGH University of Science and Technology Kraków Poland. 36Physics Department Brookhaven National Laboratory Upton NY USA. 139Department of Physics Northern Illinois University DeKalb IL USA. 130Fakultät für Physik Ludwig-Maximilians-Universität München Munich Germany. 170Particle Physics Department Rutherford Appleton Laboratory Didcot UK. 16Institute of Physics University of Belgrade Belgrade Serbia. 159Laboratório de Instrumentação e Física Experimental de Partículas-LIP Lisbon Portugal. 164Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain. 30Department of Physics Boston University Boston MA USA. 94Joint Institute for Nuclear Research JINR Dubna Dubna Russia. 173INFN Sezione d

[This corrects the article DOI: 10.1140/epjc/s10052-017-4819-4.].

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Temperature-dependent time-resolved photoluminescence study of monocrystalline CdTe/MgCdTe double heterostructures with low defect density

Temperature-dependent time-resolved photoluminescence study ...

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2014 IEEE 40th Photovoltaic Specialist Conference (PVSC)

作者： Xin-Hao Zhao Michael J. DiNezza Shi Liu Pathiraja A. R. D. Jayathilaka Odille C. Noriega Thomas H. Myers Yong-Hang Zhang School for Engineering of Matter Transport and Energy Arizona State University Tempe Arizona School of Electrical Computer and Energy Engineering Arizona State University Tempe Arizona Material Science Engineering & Commercialization Program Texas State University San Marcos TX

Confocal photoluminescence scans of monocrystalline CdTe/MgCdTe double heterostructures epitaxially grown on lattice-matched InSb substrates reveal very low twin defect density, below 1 × 10 5 cm -2 . Room-temperature Shockley-Read-Hall (SRH) lifetimes of these samples are determined in the range of 35 ns to 86 ns using time-resolved photoluminescence (TRPL) measurements. Temperature-dependent TRPL measurements show that the carrier lifetime reaches a peak of 910 ns at 200 K. Excitation-dependent PL measurements reveal the radiative recombination coefficient of CdTe to be 4.3 × 10 -9 cm 3 ·s -1 .

关键词： Temperature measurement Thickness measurement Nuclear measurements Abstracts Indexes Molecular beam epitaxial growth

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