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arXiv 2018年

作者： Sinclair, Josiah Spierings, David Brodutch, Aharon Steinberg, Aephraim M. Centre for Quantum Information and Quantum Control and Institute for Optical Sciences Department of Physics University of Toronto 60 St. George Street TorontoONM5S 1A7 Canada Edward S. Rogers Sr. Department of Electrical & Computer Engineering 10 King's College Road TorontoONM5S 3G4 Canada Canadian Institute For Advanced Research MaRS Centre West Tower 661 University Ave. TorontoONM5G 1M1 Canada

Constructing an ontology for quantum theory is challenging, in part due to unavoidable measurement back-action. The Aharonov-Albert-Vaidman weak measurement formalism provides a method to predict measurement results (weak values) in a regime where back-action is negligible. The weak value appears analogous to a classical conditional mean and in fact, has a number of features that further suggest it may be interpreted as being related to some underlying ontological model. However, the ontology appears bizarre since the weak values are complex and unbounded. Here, we study weak values in the context of a recent quantum optical experiment involving two-photon interactions. The results of the experiment are reinterpreted within a 'stochastic optics' model of light. The model is based on standard (Maxwell) electromagnetic theory, supplemented by stochastic fluctuations of the electromagnetic fields. We show that the conditional means of the electric field intensities correspond to the experimentally observed weak values. This is a provocative result, as it suggests that at least within this experiment, the weak value gives us information about the average of an ontological quantity (the intensity). We study the breakdown of the stochastic optics model, which occurs outside the experimentally probed regime, and in particular in the limit where the weak value predicts 'anomalous' results. Copyright © 2018, The Authors. All rights reserved.

关键词： Stochastic systems

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Gradient material model in analysis of mechanical joints of CFRP laminate

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AIP Conference Proceedings 2018年第1期1922卷

作者： Krzysztof Puchała Szymczyk Elżbieta Jerzy Jachimowicz Paweł Bogusz 1Department of Mechanics and Applied Computer Science Faculty of Mechanical Engineering Military University of Technology Kaliskiego Street 2 00-908 Warsaw Poland e-mail: kmiis@wat.edu.pl

Mechanical joints (e.g. bolted) used for decades are proved to be reliable. They can be assembled and applied in very rough conditions since they are less sensitive to environmental effects than other types of joints (e.g. adhesive). Therefore, they are still employed in aircraft design. High specific stiffness and strength of composite materials (especially CFRP) cause a continuous increase in their usage in aircraft structures. In general, composites are brittle materials and more notch sensitive than metal alloys. Hole making is a necessary stage in manufacturing of a mechanical joint. Holes vicinities are the areas of high stress concentrations and determine load capability of the whole structure. Therefore, mechanical joints of composite parts require a special focus during both a designing and a manufacturing process. The aim of the paper is analysis of potential local material weakness/deterioration caused by a drilling process and its influence on the global response of a mechanical joint. The specimen in the form of a double-shear joint was analyzed. The weakened areas were identified on the basis of NDT ultrasonic analysis. A simple gradient material model was proposed to describe the hole vicinity. Numerical simulations were performed and compared to experimental results.

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Mixed-ADC/DAC multipair massive MIMO relaying systems: Performance analysis and power optimization

arXiv

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arXiv 2018年

作者： Zhang, Jiayi Dai, Linglong He, Ziyan Ai, Bo Dobre, Octavia A. School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China National Mobile Communications Research Laboratory Southeast University Nanjing210096 China Department of Electronic Engineering Tsinghua University Beijing100084 China School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA30332 United States State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing100044 China Faculty of Engineering and Applied Science Memorial University St. John'sNLA1B 3X5 Canada

High power consumption and expensive hardware are two bottlenecks for practical massive multiple-input multipleoutput (mMIMO) systems. One promising solution is to employ low-resolution analog-to-digital converters (ADCs) and digital-toanalog converters (DACs). In this paper, we consider a general multipair mMIMO relaying system with a mixed-ADC/DAC architecture, in which some antennas are connected to lowresolution ADCs/DACs, while the rest of the antennas are connected to high-resolution ADCs/DACs. Leveraging on the additive quantization noise model, both exact and approximate closed-form expressions for the achievable rate are derived. It is shown that the achievable rate can approach the unquantized one by using only 2-3 bits of resolutions. Moreover, a power scaling law is presented to reveal that the transmit power can be scaled down inversely proportional to the number of antennas at the relay. We further propose an efficient power allocation scheme by solving a complementary geometric programming problem. In addition, a trade-off between the achievable rate and power consumption for different numbers of low-resolution ADCs/DACs is investigated by deriving the energy efficiency. Our results reveal that the large antenna array can be exploited to enable the mixed- ADC/DAC architecture, which significantly reduces the power consumption and hardware cost for practical mMIMO systems. Copyright © 2018, The Authors. All rights reserved.

关键词： Energy efficiency

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Design and initial study of porous core electromagnet for levitation applications

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AIP Conference Proceedings 2018年第1期2029卷

作者： Adam Piłat Bartosz Sikora 1AGH University of Science and Technology Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering Department of Automatic Control and Robotics Mickiewicza 30 30-059 Krakow Poland

A concept of the porous core electromagnet is studied. The form for the electromagnet core was printed using 3D technique. The core was manufactured manually using iron filings and cured in room temperature and air pressure. The aim of this paper is to deliver initial analysis of the proposed powder core together with the modelling procedure by the using finite element method, and to compare the experimental results of the manually manufactured electromagnet. The material property of the numerical model was adjusted to fit the experimental results. Finally, the electromagnet was tested in the levitation real–time experiment.

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New method for the determination of the linear attenuation coefficient of γ rays in matter

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AIP Conference Proceedings 2019年第1期2075卷

作者： E. Adamides A. Kavadjiklis S. K. Koutroubas P. Koutroubas N. Moshonas 1Department of Physics Chemistry and Materials Technology STEF Technological Educational Institute of Piraeus P. Ralli and Thivon 250 GR-12244 Egaleo Greece 2School of Applied Mathematical and Physical Science National Technical University of Athens 9 Iroon Polytechniou GR-15773 Athens Greece 3School of Electrical and Computer Engineering National Technical University of Athens 9 Iroon Polytechniou GR-15773 Athens Greece

In our previous participations to the Panhellenic Physics Conference (PPC) we refer to detailed and accurate measurements of 60Co γ-ray attenuation in various absorbers, that our team has performed, and their meaning as well. In the present article we extended these measurements in even more absorbers which already cover a wide range of atomic number Zeff, from very large values (Hg) to very small ones (H2O). Our experiments reveal some interesting phenomena like the systematic influence of the build-up effect. This systematic behavior can be used in order to determine the linear coefficient of γ-ray attenuation in matter.

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Robust real-time implementation of adaptive feedback cancellation using noise injection algorithm on smartphone

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Proceedings of Meetings on Acoustics 2018年第1期33卷

作者： Parth Mishra Serkan Tokgoz Issa M. S. Panahi 1Department of Electrical and Computer Engineering University of Texas at Dallas Richardson TEXAS 75080 USA parthm694@*** sxt167830@utdallas.edu imp015000@utdallas.edu

We propose a low latency smartphone-based application that demonstrates the real-time operation to cancel the negative effects of acoustic feedback arising from the coupling between the speaker and the microphone of the smartphone or similar device utilizing the robust Noise Injection (NI) method. We make use of multiple noise injections of short duration to estimate the filter coefficients of an appropriate order between the speaker and the microphone, in order to perform the feedback cancellation effectively in real-time. Our motive behind the development of this application is to perform an effective acoustic feedback cancellation irrespective of the position of speaker and the microphone on the platform under consideration. With the proposed application, we can estimate the transfer function between speaker and microphone in the changing room acoustics making the feedback cancellation very effective. A real-time implementation on an Android-based smartphone is presented in this paper.

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Corrigendum to “Assessing sustainability of soybean supply in China: Evidence from provincial production and trade data” [J. Clean. Prod. (2020) 245 119006]

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Journal of Cleaner Production 2021年 297卷

作者： Fei Wu Yong Geng Yuquan Zhang Chenxing Ji Yifan Chen Lu Sun Wei Xie Tariq Ali Tsuyoshi Fujita School of Environmental Science and Engineering Shanghai Jiao Tong University Minhang Shanghai 200240 China School of International and Public Affairs Shanghai Jiao Tong University Xuhui Shanghai 200030 China China Institute for Urban Governance Shanghai Jiao Tong University No. 800 Dongchuan Road Minhang Shanghai 200240 China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China China-UK Low Carbon College Shanghai Jiao Tong University No.3 Yinlian Road Pudong New Area Shanghai 201306 China Department of Electrical Engineering and Computer Science University of California Irvine Irvine 92629 USA School of Geographic Sciences East China Normal University No. 500 Dongchuan Road Minhang Shanghai 200241 China Center for Social and Environmental Systems Research National Institute for Environmental Studies 16-2 Onogawa Tsukuba Ibaraki 305-8506 Japan Department of Environment Systems Graduate School of Frontier Sciences The University of Tokyo 5-1-5 Kashiwanoha 277-8563 Japan China Center for Agricultural Policy School of Advanced Agricultural Sciences Peking University No.5 Yiheyuan Road Haidian District Beijing 100871 China North China University of Technology No.5 Jinyuanzhuang Road Shijingshan District Beijing 100144 China

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Multi-criterion statistical model for online advertisement system

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AIP Conference Proceedings 2018年第1期2016卷

作者： Boo Siong Khoo Hee Kooi Khoo 1Department of Computer Science and Digital Technologies Pandon Building Northumbria University Newcastle upon Tyne United Kingdom 2Department of Computing School of Engineering Computing and Built Environment KDU Penang University College Georgetown Malaysia

Nowadays, online advertising is very famous and evolving over the past decades that users feel that it is annoying and wasting of time to view the advertisements. Presently, technologies have improvise to include data mining technique that is able to study your preferences and behaviors to predict and provide advertisements that suit the users’ needs. The effectiveness of advertising is high due to the system able to gather data behaviors and provide advertisements based on the users’ needs. A multi-criterion statistical model is established to provide user with closest possible matches of advertisements. The proposed model identifies the returning users based on various aspects of behaviors as well as previous session to identify the type of user that previously recorded in the system. Then, the information for the behaviors are collected and then classified into two groups; users’ behaviors, users’ preferences, and survey to obtain top three categories based on the frequencies of revisiting for an advertisement. As a result, the accurate advertisements will be displayed to the online users.

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A Novel Technique for Quantifying Clusters Based on Small Squares in a Spatial Prisoner’s Dilemma

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Procedia computer Science 2017年 112卷 2497-2505页

作者： Ryota Matsumoto Masahiro Tokumitsu Hironao Koshimizu Yoshiteru Ishida Department of Electrical and Control Engineering National Institute of Technology Yonago College 4448 Hikonacho Yonago Tottori 683-0854 Japan Department of Liberal Arts National Institute of Technology Yonago College 4448 Hikonacho Yonago Tottori 683-0854 Japan Department of Computer Science and Engineering Toyohashi University of Technology 1-1 Hibarigaoka Toyohashi Aichi 441-8580 Japan

A number of studies have revealed and investigated how the clusters organized by cooperators emerge in a spatial prisoner’s dilemma. However, a qualitative analysis of the clusters formed by the cooperators has not yet been studied. This paper aims to propose a new technique for quantifying clusters that consist of players with cooperative strategies. The proposed method can be applied to the spatial prisoner’s dilemma in a square lattice network. In the proposed method, a minimum cluster is defined as a group of the cooperators based on a small square (2 by 2). This paper also defines a degree of the clusters by extending the small squares that based on how the players organize themselves into coordinated groups. The authors analyze and compare with typical examples of the clusters in the spatial prisoner’s dilemma. By analyzing the examples, this paper demonstrates that the proposed method quantifies the degree of the clusters organized by the cooperators. The authors also examine the significance of the proposed method by the simulations of the spatial prisoner’s dilemma.

关键词： Spatial prisoner’s dilemma prisoner’s dilemma game theory clusters of cooperators cluster index of cooperators cooperative strategies

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Entropic uncertainty relations and the measurement range problem, with consequences for high-dimensional quantum key distribution

arXiv

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arXiv 2018年

作者： Bourassa, J. Eli Lo, Hoi-Kwong Department of Physics University of Toronto 60 St. George St. TorontoONM5S 1A7 Canada Center for Quantum Information and Quantum Control University of Toronto 80 St. George St. TorontoONM5S3H6 Canada Department of Electrical and Computer Engineering University of Toronto 10 King's College Road TorontoONM5S 3G4 Canada

The measurement range problem, where one cannot determine the data outside the range of the detector, limits the characterization of entanglement in high-dimensional quantum systems when employing, among other tools from information theory, the entropic uncertainty relations. Practically, the measurement range problem weakens the security of entanglementbased large-alphabet quantum key distribution (QKD) employing degrees of freedom including time-frequency or electric field quadrature. We present a modified entropic uncertainty relation that circumvents the measurement range problem under certain conditions, and apply it to well-known QKD protocols. For time-frequency QKD, although our bound is an improvement, we find that high channel loss poses a problem for its feasibility. In homodyne-based continuous variable QKD, we find our bound provides a quantitative way to monitor for saturation attacks. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum cryptography

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