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Over layer sensing using terahertz meta-material split ring resonator

Sensor Letters 2016年第4期14卷 447-450页

作者： Naeem, Nadeem Ismail, Alyani Alhawari, Adam Reda Hassan Mahdi, Mohd Adzir Faculty of Engineering Universiti Putra Malaysia Serdang Selangor43300 Malaysia Department of Computer and Communication Systems Engineering Research Center of Excellence for Wireless and Photonics Networks Universiti Putra Malaysia Serdang Selangor43300 Malaysia

Over layer sensing of thin dielectric layers using novel meta-material inspired split rings resonator based sensor is reported in this letter. The sensor is designed to work in terahertz frequency. The contribution of the proposed split ring resonator based terahertz sensor is in the sub-wavelength size simple planar structure design with high quality factor that effectively detects the presence of very thin dielectric sample layers as a function of sensor split gap area coverage. © 2016 American Scientific Publishers.

关键词： Ring gages

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Detection, location, and estimation of severity of interturn faults in power transformers

Detection, location, and estimation of severity of interturn...

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Compatibility in Power Electronics (CPE)

作者： Jawad Faiz J. Gharaeei S. Lotfifard Center of Excellence on Applied Electromagnetic Systems University of Tehran Tehran Iran School of Electrical Engineering and Computer Science Washington State University Pullman Washington USA

Interturn faults (ITFs) in power transformers is the major cause of transformer failures. If this fault is not quickly detected, it can be extended and led to catastrophic failure and a complete transformer breakdown. This can generate high costs for repair or replacement and financial loss due to the power outage. The objective of this paper is detection of low severities ITF under unbalanced load, unbalanced supply, external short circuits and locating the faulty phase. An appropriate index based on negative sequence current for detecting, locating and determining fault severity is introduced. Time stepping finite elements method is used to verify the performance of the suggested index in fault detection of power transformers.

关键词： Circuit faults Windings Oil insulation Power transformer insulation Mathematical model Current transformers

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Device Architecture for Coupling Spin Qubits Via an Intermediate Quantum State

arXiv

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arXiv 2017年

作者： Croot, X.G. Pauka, S.J. Watson, J.D. Gardner, G.C. Fallahi, S. Manfra, M.J. Reilly, D.J. ARC Centre of Excellence for Engineered Quantum Systems School of Physics University of Sydney SydneyNSW2006 Australia Department of Physics and Astronomy Purdue University West LafayetteIN47907 United States Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States Station Q Purdue Purdue University West LafayetteIN47907 United States School of Materials Engineering School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States Microsoft Corporation Station Q Sydney University of Sydney SydneyNSW2006 Australia

We demonstrate a scalable device architecture that facilitates indirect exchange between singlet-triplet spin qubits, mediated by an intermediate quantum state. The device comprises five quantum dots, which can be independently loaded and unloaded via tunnelling to adjacent reservoirs, avoiding charge latch-up common in linear dot arrays. In a step towards realizing two-qubit entanglement based on indirect exchange, the architecture permits precise control over tunnel rates between the singlet-triplet qubits and the intermediate state. We show that by separating qubits by ∼ 1 µm, the residual capacitive coupling between them is reduced to ∼ 7 µeV. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum entanglement

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Inferring origin-destination flows using mobile phone data: A case study of Senegal

Inferring origin-destination flows using mobile phone data: ...

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International Conference on Electrical engineering/Electronics, computer, Telecommunications and Information Technology, ECTI-CON

作者： Merkebe Getachew Demissie Francisco Antunes Carlos Bento Santi Phithakkitnukoon Titipat Sukhvibul Universidade de Coimbra Coimbra Coimbra PT Center for Informatics and Systems of the University of Coimbra (CISUC) Coimbra Portugal Excellence Center in Infrastructure Technology and Transportation Engineering (ExCITE) and Department of Computer Engineering Chiang Mai University Chiang Mai Thailand

In transportation planning, estimating the movement of people between a set of origins and destinations is a challenging task. This has been inferred in two way: from data on household socioeconomic attributes in each study zone or based on the characteristics of the study zones such as population, employment, number of cars, etc. However, developing these models can be difficult, especially in the developing countries where transport planners have limited budget to collect detailed transportation data. In this study, we use mobile phone data to estimate the origin-destination (OD) flows between districts of Senegal. We have developed two approaches to estimate commuting trips, recurring travel between one's place of residence and place of work, and irregular trips, which are not recurring, but found to be predominant in developing countries. The inferred OD flows from sample users are expanded using the total population from census data. The results demonstrate how mobile phone data can be used to sense movement of large portion of population more regularly and with reduced cost, especially, in circumstances where relevant data are unavailable or in poor supply.

关键词： Mobile handsets Sociology Statistics Estimation Transportation Urban areas Planning

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Analysis and Design of Coupling Capacitors for Contactless Capacitive Power Transfer systems

Analysis and Design of Coupling Capacitors for Contactless C...

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Transportation Electrification Conference and Expo

作者： Deepak Rozario Najath Abdul Azeez Sheldon S. Williamson Smart Transportation Electrification and Energy Research (STEER) Group Advanced Storage Systems and Electric Transportation (ASSET) Laboratory UOIT-Automotive Center of Excellence (UOIT-ACE) Department of Electrical Computer and Software Engineering Fac

ISBN: (纸本)9781509004041

This paper is focused on the analysis and design of the capacitive plates of the capacitive wireless power transfer system. The coupling structure resembles a loosely coupled capacitor. The electric field coupling interface is the most vital part of the wireless technology. The coupling interface determines the capacitance of the coupling capacitors, maximum power transfer, frequency and overall efficiency of the system. The paper is dedicated to understand the behaviour of the system with respect to the structural construction, frequency of operation and factors that affect the power transfer of the system. The various arrangements and configurations of the capacitive power transfer (CPT) are discussed. The important factors affects the value of coupling capacitance are discussed. Based on results obtained from the analysis, a design guide line is laid out for the construction of the coupling capacitors. The design guidelines addresses critical issues such as operational voltage, temperature stability and selection of the dielectric material. The construction of the system is simple, rugged and inexpensive, which makes it a great contender among the other wireless technology.

关键词： Capacitor circuits chargers energy storage modelling surface charging transportation

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A Modified Resonant Converter for Wireless Capacitive Power Transfer systems used in Battery Charging Applications

A Modified Resonant Converter for Wireless Capacitive Power ...

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Transportation Electrification Conference and Expo

ISBN: (纸本)9781509004041

The paper outlines a capacitive power transfer (CPT) system for higher power applications. The paper summarizes the operating principle, power electronics requirement and modeling of a basic CPT system. The high frequency converter is the drive force of the contactless system. The high frequency converters found in literature are discussed with their advantages and their drawbacks. With the knowledge of the converters used, an existing topology is modified to fit the capacitive interface of the capacitive power transfer system. The modified LLC resonant converters has several advantages over the traditional converters used for contactless CPT .The converter has a very high power density and can be used for very high power applications. One of the greatest advantages the modified LLC resonant converter is the ability to work off resonance and the inherent ability to buck or boost as per its gain plot. The converter exhibits efficiencies greater than 90%. The design of the proposed topology along with its advantages over the existing topologies for small distance applications are listed.

关键词： Capacitive Circuits Wireless Power Transfer Power Electronics Surface Charging Transportation

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Gate-sensing charge pockets in the semiconductor qubit environment

arXiv

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arXiv 2017年

作者： Croot, X.G. Pauka, S.J. Lu, H. Gossard, A.C. Watson, J.D. Gardner, G.C. Fallahi, S. Manfra, M.J. Reillyy, D.J. ARC Centre of Excellence for Engineered Quantum Systems School of Physics University of Sydney SydneyNSW2006 Australia Materials Department University of California Santa BarbaraCA93106 United States Department of Physics and Astronomy Purdue University West LafayetteIN47907 United States Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States Station Q Purdue Purdue University West LafayetteIN47907 United States School of Materials Engineering School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States Microsoft Corporation Station Q Sydney University of Sydney SydneyNSW2006 Australia

We report the use of dispersive gate sensing (DGS) as a means of probing the charge environment of heterostructure-based qubit devices. The DGS technique, which detects small shifts in the quantum capacitance associated with single-electron tunnel events, is shown to be sensitive to pockets of charge in the potential-landscape likely under, and surrounding, the surface gates that define qubits and their readout sensors. Configuring a quantum point contact (QPC) as a localised emitter, we show how these charge pockets are activated by the relaxation of electrons tunnelling through a barrier. The presence of charge pockets creates uncontrolled offsets in gate-bias and their thermal activation by on-chip tunnel currents suggests further sources of charge-noise that lead to decoherence in semiconductor qubits. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum chemistry

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Raising fairness issue of vehicle routing problem

Raising fairness issue of vehicle routing problem

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IEEE International Conference on Intelligent Transportation engineering (ICITE)

作者： Saiful Azad Leonardo Badia Arafatur Rahman Jasni Mohamad Zain Faculty of Computer Systems & Software Engineering University Malaysia Pahang Gambang Kuantan Malaysia UMP IBM Center of Excellence Gambang Kuantan Malaysia Department of Information Engineering University of Padova Padova Italy Universiti Malaysia Pahang Kuantan Pahang MY

ISBN: (纸本)9781467390491

Since fairness deals with the quality of distributing the jobs and creates an ambience that is free from any discrimination, any distribution management problem must take fairness issue into consideration. Again, since the Vehicle Routing Problem (VRP) is also a distribution management problem, any VRP solving algorithm must consider the fairness when solutions are explored. However, most of the proposed VRP solving algorithms do not take this issue into consideration. In this paper, we raise this issue with sufficient evidences. In this course of action, following contributions are made in this paper: i) fairness issue is raised analytically, and to support this, an extensive simulation campaign is performed, ii) the VRP is discussed through a practical application, namely Garbage Collection Problem (GCP), and later it is mathematically formulated, iii) a Genetic Algorithm (GA) is employed to explore feasible solutions for the given application (i.e., GCP), and iv) some future research directives are noted, which will help the researchers to extend this work.

关键词： Silicon Vehicles Genetic algorithms Vehicle routing Mathematical model Analytical models Urban areas

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Design a technique for minimizing unnecessary handoff in mobile wireless networks 4

Design a technique for minimizing unnecessary handoff in mob...

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4th International Conference on Software engineering and computer systems, ICSECS 2015

作者： Rahman, Md. Arafatur Salih, Qusay Medhat Zolkipli, Mohamad Fadli Bin Faculty of Computer Systems and Software Engineering University Malaysia Pahang Malaysia IBM Center of Excellence University Malaysia Pahang Malaysia

ISBN: (纸本)9781467367226

Unnecessary handoff is one of the key issues in mobile wireless network, since it consumes the network's resources that degrades the performance of the network. Handoff appears when the Receive Signal Strength (RSS) of a mobile node becomes below threshold value (i.e., an acceptable level of RSS for ensuring communication). Subsequently, the mobile node starts scanning to discover a new RSS from neighbors Access Point (AP) to keep continuing the communication. However, traditional handoff algorithm is not accurate due to only depend on the RSS. It is affected by many factors (e.g., shadowing, scattering, reflection, etc.) that initiate unnecessary handoff decision. In this paper, a new technique is proposed to mitigate the unnecessary handoff. The simulation result confirms the effectiveness of the proposal. © 2015 IEEE.

关键词： Wireless networks

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Local wafer temperature non-uniformity correction with laser irradiation

Local wafer temperature non-uniformity correction with laser...

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IEEE/SEMI Conference and Workshop on Advanced Semiconductor Manufacturing

作者： Preetham P. Rao Applied Materials Computer Aided Engineering Center of Excellence Bangalore India

The application of correcting small temperature non-uniformity on Silicon wafers using local irradiation with spatially scanning laser beams was analyzed. The objective of the study was to understand the specifications of such a laser beam to elevate the temperature of a wafer locally by 1 to 5°C. A detailed analytical model has been developed for predicting power level, exposure time, scanning speed, and the beam characteristics. The model has been derived by solving the three dimensional transient heat equation using Green's function approach. Various wafer characteristics, such as the surface reflectivity, material absorption coefficient, and thermal properties have been built into the formulation as parameters, so that several what-if scenarios can be evaluated with ease and accuracy. Existing analytical methods in literature for prediction of laser irradiated substrate temperatures assume infinite thickness of the substrate. In this study, it has been found that this approximation could result in significant errors particularly for the present application of interest, where the wafer thickness is finite and the focus is on relatively small local temperature rise in short exposure durations. Numerical models were also developed to mimic some particular cases using a commercial finite volume method solver. The numerical and analytical results show an excellent agreement. The analytical model allows for a more diverse range of variables than the finite volume numerical models.

关键词： Laser beams Substrates Mathematical model Heating Radiation effects Silicon Absorption

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