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IEEE International Symposium on Antennas and Propagation

作者： Ismail E. Uysal H. Arda Ulku Hakan Bagci Division of Computer Electrical and Mathematical Sciences and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

ISBN: (纸本)9781479978168

A marching on in time (MOT) scheme for solving the Poggio-Miller-Chan-Harrington-Wu-Tsai (PMCHWT) surface integral equation on plasmonic nanostructures is described. The proposed scheme calls for temporal convolutions of the permittivity and Green function of the plasmonic medium with the temporal basis function. Time domain samples of the permittivity and the Green function required by these convolutions are computed using a fast relaxed vector fitting (FRVF) algorithm. Numerical results demonstrate the accuracy and applicability of the proposed MOT-PMCHWT solver.

关键词： Transient analysis Green's function Dielectric constant Solvers Nanostructure Area integral basis functions Convolution

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Structural and excited-state properties of oligoacene crystals from first principles

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physical Review B 2016年第11期93卷 115206-115206页

作者： Tonatiuh Rangel Kristian Berland Sahar Sharifzadeh Florian Brown-Altvater Kyuho Lee Per Hyldgaard Leeor Kronik Jeffrey B. Neaton Molecular Foundry Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics University of California Berkeley California 94720-7300 USA Centre for Material Science and Nanotechnology University of Oslo NO-0316 Oslo Norway Department of Electrical and Computer Engineering and Division of Materials Science and Engineering Boston University Boston Massachusetts 02215 USA Department of Chemistry University of California Berkeley California 94720-7300 USA Department of Microtechnology and Nanoscience MC2 Chalmers University of TechnologySE-41296 Göteborg Sweden Materials Science and Applied Mathematics Malmö University Malmö SE-205 06 Sweden Department of Materials and Interfaces Weizmann Institute of Science Rehovoth 76100 Israel Kavli Energy NanoSciences Institute at Berkeley Berkeley California 94720-7300 USA

Molecular crystals are a prototypical class of van der Waals (vdW) bound organic materials with excited-state properties relevant for optoelectronics applications. Predicting the structure and excited-state properties of molecular crystals presents a challenge for electronic structure theory, as standard approximations to density functional theory (DFT) do not capture long-range vdW dispersion interactions and do not yield excited-state properties. In this work, we use a combination of DFT including vdW forces, using both nonlocal correlation functionals and pairwise correction methods, together with many-body perturbation theory (MBPT) to study the geometry and excited states, respectively, of the entire series of oligoacene crystals, from benzene to hexacene. We find that vdW methods can predict lattice constants within 1% of the experimental measurements, on par with the previously reported accuracy of pairwise approximations for the same systems. We further find that excitation energies are sensitive to geometry, but if optimized geometries are used MBPT can yield excited-state properties within a few tenths of an eV from experiment. We elucidate trends in MBPT-computed charged and neutral excitation energies across the acene series and discuss the role of common approximations used in MBPT.

关键词： Van der Waals interaction Organic semiconductors Density functional theory GW method Perturbative methods

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Analysis of transient electromagnetic wave interactions on graphene-based devices using integral equations

Analysis of transient electromagnetic wave interactions on g...

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USNC-URSI Radio science Meeting (Joint with AP-S Symposium)

作者： Yifei Shi Ismail E. Uysal Ping Li H. Arda Ulku Hakan Bagci Division of Computer Electrical and Mathematical Sciences and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

Graphene is a monolayer of carbon atoms structured in the form of a honeycomb lattice. Recent experimental studies have revealed that it can support surface plasmons at Terahertz frequencies thanks to its dispersive conductivity. Additionally, characteristics of these plasmons can be dynamically adjusted via electrostatic gating of the graphene sheet (K. S. Novoselov, et al., science, 306, 666–669, 2004). These properties suggest that graphene can be a building block for novel electromagnetic and photonic devices for applications in the fields of photovoltaics, bio-chemical sensing, all-optical computing, and flexible electronics. Simulation of electromagnetic interactions on graphene-based devices is not an easy task. The thickness of the graphene sheet is orders of magnitude smaller than any other geometrical dimension of the device. Consequently, discretization of such a device leads to significantly large number of unknowns and/or ill-conditioned matrix systems.

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Nanoimprint Lithography: Angle-Insensitive and CMOS-Compatible Subwavelength Color Printing (Advanced Optical Materials 11/2016)

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Advanced Optical Materials 2016年第11期4卷

作者： Kyu-Tae Lee Ji-Yun Jang Sang Jin Park Chengang Ji Sung-Mo Yang L. Jay Guo Hui Joon Park Department of Electrical Engineering and Computer Science The University of Michigan Ann Arbor MI 48109 USA Division of Energy Systems Research Ajou University Suwon 16499 South Korea Department of Electrical and Computer Engineering Ajou University Suwon 16499 South Korea

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Low Complexity Parameter Estimation For Off-the-Grid Targets

Low Complexity Parameter Estimation For Off-the-Grid Targets

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Sensor Signal Processing for Defence (SSPD)

作者： Seifallah Jardak Sajid Ahmed Mohamed-Slim Alouini Computer Electrical and Mathematical Science and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Makkah Province Saudi Arabia

In multiple-input multiple-output radar, to estimate the reflection coefficient, spatial location, and Doppler shift of a target, a derived cost function is usually evaluated and optimized over a grid of points. The performance of such algorithms is directly affected by the size of the grid: increasing the number of points will enhance the resolution of the algorithm but exponentially increase its complexity. In this work, to estimate the parameters of a target, a reduced complexity super resolution algorithm is proposed. For off-the-grid targets, it uses a low order two dimensional fast Fourier transform to determine a suboptimal solution and then an iterative algorithm to jointly estimate the spatial location and Doppler shift. Simulation results show that the mean square estimation error of the proposed estimators achieve the Craḿer-Rao lower bound.

关键词： Cost function Signal to noise ratio Doppler shift Iterative methods Estimation Interference Covariance matrices

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Understanding negative capacitance dynamics in ferroelectric capacitors 4

Understanding negative capacitance dynamics in ferroelectric...

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4th Berkeley Symposium on Energy Efficient Electronic Systems, E3S 2015

作者： Khan, Asif Islam Chatterjee, Korok Ramesh, Ramamoorthy Salahuddin, Sayeef Dept. of Electrical Engineering and Computer Sciences University of California CA94720 United States Dept. of Physics University of California CA94720 United States Dept. of Material Science and Engineering University of California CA94720 United States Material Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

ISBN: (纸本)9781467385688

We investigate negative capacitance transients-the time period during ferroelectric switching when the voltage across a ferroelectric changes in a direction opposite to that of the charge-by constructing a simple series network of an isolated single crystalline ferroelectric capacitor and an external resistor. A study of negative capacitance dynamics in such a circuit reveals that the time scale of this phenomenon is controlled by the external resistor rather than by the material dependent intrinsic speeds. As a canonical approach for directly measuring ferroelectric negative capacitance, these experiments could guide the efforts to stabilize negative capacitance in a transistor structure for sub-60 mV/decade subthreshold characteristics as well as help assess negative capacitance response speed at technologically relevant dimensions. © 2015 IEEE.

关键词： Resistors

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Core losses model of switched reluctance motor

Core losses model of switched reluctance motor

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Selected Problems of electrical engineering and Electronics (WZEE)

作者： Mirosław Wciślik Karol Suchenia Faculty of Electrical Engineering Division of Devices and Systems in Automatic Control Kielce Poland Faculty of Electrical Engineering Automatic Control and Computer Science Kielce University of Technology Kielce Poland

The paper deals with a mathematical model of switched reluctance motor, with stator of on induction motor. The parameters of this model were determined experimentally. The motor winding were supplied from different frequencies AC voltage source. Based on the measurements of current and voltage equivalent resistance and inductance of motor windings as a function of frequency were determined using the least squares method. The measurements for different rotation angle of the rotor were carried out. The measured resistance value was significantly higher than the value of the winding resistance because of “iron losses”. The losses are modeled as the losses of a single turn wound on the rotor core, representing the eddy currents circuit. The losses are dependent on the angle of the rotor rotation relative to the stator. Based on the relationship between the equivalent inductance and resistance of the motor measured and specified of the model, the parameters were determined.

关键词： Reluctance motors Mathematical model Windings Resistance Induction motors Radio frequency Magnetic cores

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Modeling and analysis of self-excited induction generator for wind energy conversion

Modeling and analysis of self-excited induction generator fo...

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Innovative Smart Grid Technologies (ISGT)

作者： Tarek Medalel Masaud P.K. Sen Department of Electrical Engineering & Computer Science Texas A&M University-Kingsville Kingsville Texas Division of Engineering Colorado School of Mines Golden Colorado

Self-Excited Induction Generators (SEIG) have recently emerged for wind energy conversion in remote and rural areas due to many advantages as standalone induction generator over Grid Connected Induction Generators. However, poor voltage and frequency regulation under varying load and speed is the prime disadvantage of standalone SEIG. Steady state analysis for such machines is important to understand their behavior under varying operating conditions. This paper presents a detailed d-q model of SEIG using Matlab/Simulink which contributes to the development of SEIG modeling with a limited complexity. From the generalized d-q model, the effect of different constraints such as, variation of prime mover speed, and excitation capacitor size, on the SEIG output built up process have been addressed and analyzed. The variation of the magnetizing inductance and the non-linearity is also considered.

关键词： Induction generators Mathematical model Rotors Load modeling Capacitors MATLAB Reactive power

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Comparison of Fragmentation Functions for Jets Dominated by Light Quarks and Gluons from pp and Pb+Pb Collisions in ATLAS

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physical Review Letters 2019年第4期123卷 042001-042001页

作者： M. Aaboud G. Aad B. Abbott O. Abdinov B. Abeloos D. K. Abhayasinghe S. H. Abidi O. S. AbouZeid N. L. Abraham H. Abramowicz H. Abreu Y. Abulaiti B. S. Acharya S. Adachi L. Adamczyk J. Adelman M. Adersberger A. Adiguzel T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alberghi J. Albert P. Albicocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos M. Alhroob B. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty B. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi B. T. Amadio Y. Amaral Coutinho L. Ambroz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei C. R. Anelli S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio Bella G. Arabidze J. P. Araque V. Araujo Ferraz R. Araujo Pereira A. T. H. Arce R. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos A. J. Armbruster L. J. Armitage A. Armstrong O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asbah A. Ashkenazi E. M. Asimakopoulou L. Asquith K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. B. Atlay K. Augsten G. Avolio R. Avramidou M. K. Ayoub G. Azuelos A. E. Baas M. J. Baca H. Bachacou K. Bachas M. Backes P. Bagnaia M. Bahmani H. Bahrasemani A. J. Bailey J. T. Baines M. Bajic C. Bakalis O. K. Baker P. J. Bakker D. Bakshi Gupta E. M. Baldin P. Balek F. Balli W. K. Balunas J. Balz E. Banas A. Bandyopadhyay S. Banerjee A. A. E. Bannoura L. Barak W. M. Barbe E. L. Barberio D. Barberis M. Barbero T. Barillari M-S. Barisits J. Barkeloo T. Barklow N. Barlow R. Barnea S. L. Barnes B. M. Barnett R. M. Barnett Z. Barnovska-Blenessy A. Baroncelli Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Universidad de Granada Granada (Spain) Spain Laboratório de Instrumentação e Física Experimental de Partículas—LIP Portugal Joint Institute for Nuclear Research Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Università di Roma Tor Vergata Roma Italy Faculty of Science Kyo

Charged-particle fragmentation functions for jets azimuthally balanced by a high-transverse-momentum, prompt, isolated photon are measured in 25 pb−1 of pp and 0.49 nb−1 of Pb+Pb collision data at 5.02 TeV per nucleon pair recorded with the ATLAS detector at the Large Hadron Collider. The measurements are compared to predictions of Monte Carlo generators and to measurements of inclusively selected jets. In pp collisions, a different jet fragmentation function in photon-tagged events from that in inclusive jet events arises from the difference in fragmentation between light quarks and gluons. The ratios of the fragmentation functions in Pb+Pb events to that in pp events are used to explore the parton color-charge dependence of jet quenching in the hot medium. In relatively peripheral collisions, fragmentation functions exhibit a similar modification pattern for photon-tagged and inclusive jets. However, photon-tagged jets are observed to have larger modifications than inclusive jets in central Pb+Pb events.

关键词： Quantum chromodynamics Quark & gluon jets Quark-gluon plasma Relativistic heavy-ion collisions Strong interaction

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HΛ3 and H‾Λ‾3 lifetime measurement in Pb–Pb collisions at s_NN=5.02 TeV via two-body decay

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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 2019年 797卷 134905-000页

作者： Acharya, S. Adamová, D. Adhya, S.P. Adler, A. Adolfsson, J. Aggarwal, M.M. Aglieri Rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Akindinov, A. Al-Turany, M. Alam, S.N. Albuquerque, D.S.D. Aleksandrov, D. Alessandro, B. Alfanda, H.M. Alfaro Molina, R. Ali, B. Ali, Y. Alici, A. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, D. Andrews, H.A. Andronic, A. Angeletti, M. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, R. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, R. Arratia, M. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, R. Aziz, S. Azmi, M.D. Badalà, A. Baek, Y.W. Bagnasco, S. Bai, X. Bailhache, R. Bala, R. Baldisseri, A. Ball, M. Balouza, S. Baral, R.C. Barbera, R. Barioglio, L. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartsch, E. Baruffaldi, F. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Batzing, P.C. Bauri, D. Bazo Alba, J.L. Bearden, I.G. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Bellwied, R. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, D. Bertens, R.A. Berzano, D. Besoiu, M.G. Betev, L. Bhasin, A. Bhat, I.R. Bhat, M.A. Bhatt, H. Bhattacharjee, B. Bianchi, A. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, R. Biswas, S. Blair, J.T. Blau, D. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boldizsár, L. Bolozdynya, A. Bombara, M. Bonomi, G. Borel, H. Borissov, A. Borri, M. Bossi, H. Botta, E. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broker, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Buckland, M.D. Budnikov, D. Buesching, H. Bufalino, S. Bugnon, O. Buhler, P. Buncic, P. Buthelezi, Z. Butt, J.B. Buxton, J.T. Bysiak, S.A. Caffarri, D. Caliva, A. Calvo Villar, E. Camacho, R.S. Camerini, P. Capon, A.A. Carnesecchi, F. Castillo Castellanos, J. Castro, A.J. Casula, E.A.R. Catalano, F. Ceballos Sanchez, C. Chakraborty, P. Chandra, S. Chang, B. Chang, W. Chapeland, S. Chartier, M. Chattopadhyay, S. Chauvin, A. Cheshkov, C. A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation Yerevan Armenia Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Bose Institute Department of Physics Centre for Astroparticle Physics and Space Science (CAPSS) Kolkata India Budker Institute for Nuclear Physics Novosibirsk Russian Federation California Polytechnic State University San Luis Obispo CA United States Central China Normal University Wuhan China Centre de Calcul de l'IN2P3 Villeurbanne Lyon France Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN) Havana Cuba Centro de Investigación y de Estudios Avanzados (CINVESTAV) Mexico City and Mérida Mexico Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” Rome Italy Chicago State University Chicago IL United States China Institute of Atomic Energy Beijing China Chonbuk National University Jeonju South Korea Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia COMSATS University Islamabad Islamabad Pakistan Creighton University Omaha NE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan South Korea Department of Physics Sejong University Seoul South Korea Department of Physics University of California Berkeley CA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica dell'Università ‘La Sapienza’ Sezione INFN Rome Italy Dipartimento di Fisica dell'Università Sezione INFN Cagliari Italy Dipartimento di Fisica dell'Università Sezione INFN Trieste Italy Dipartimento di Fisica dell'Università Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell'Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell'Università Sezione INFN Catania Italy Dipartimento

An improved value for the lifetime of the (anti-)hypertriton has been obtained using the data sample of Pb–Pb collisions at sNN=5.02 TeV collected by the ALICE experiment at the LHC. The (anti-)hypertriton has been r...

An improved value for the lifetime of the (anti-)hypertriton has been obtained using the data sample of Pb–Pb collisions at s_NN=5.02 TeV collected by the ALICE experiment at the LHC. The (anti-)hypertriton has been reconstructed via its charged two-body mesonic decay channel and the lifetime has been determined from an exponential fit to the dN/d(ct) spectrum. The measured value, τ=242₋₃₈ ⁺³⁴ (stat.) ± 17 (syst.) ps, is compatible with representative theoretical predictions, thus contributing to the solution of the longstanding hypertriton lifetime puzzle. © 2019 The Author

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