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On particle production, negative energy flux and acceleration horizons

Good, M. R. R.; Akhmetzhanova, G. (Nazarbayev University, 2014)

In the moving mirror model, removal of acceleration horizons gives rise to negative energy flux. The total emitted energy is positive and finite, in agreement with quantum inequalities and the second law of thermodynamics ...
On PWM Strategies and Current THD for Single- and Three-Phase Cascade H-Bridge Inverters with Non-Equal DC Sources

Akhmetov, Zhansen; Hammami, Manel; Grandi, Gabriele; Ruderman, Alex (MDPI, 2019-01-30)

Cascade H-bridge (CHB) inverter is an attractive choice for integration of DC sources of different nature, e.g., for distributed generation with energy storage, photovoltaic generation, etc. In general, non-equal DC ...
On scattered convex geometries

Adaricheva, Kira; Pouzet, Maurice (2015)

A convex geometry is a closure space satisfying the anti-exchange axiom. For several types of algebraic convex geometries we describe when the collection of closed sets is order scattered, in terms of obstructions to the ...
On Self-Oscillating Wireless Power Transfer

Tretyakov, Sergei; Ra’di, Younes; Simovski, Constantin; Valagiannopoulos, Constantinos (IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS), 2017-11-13)

Abstract—Conventional wireless power transfer systems consist of a microwave power generator located at one place and a microwave power receiver located at a distance. To realize efficient power transfer, the system ...
ON-SKY SILICON PHOTOMULTIPLIER DETECTOR PERFORMANCE MEASUREMENTS FOR MILLISECOND TO SUB-MICROSECOND OPTICAL SOURCE VARIABILITY STUDIES

Lau, Albert Wai Kit; Shafiee, Mehdi; Smoot, George F.; Grossan, Bruce; Li, Siyang; Maksut, Zhanat (arxiv, 2020)

In our Ultra-Fast Astronomy (UFA) program, we aim to improve measurements of variability of astro nomical targets on millisecond and shorter time scales. In this work, we present initial on-sky measurements of the performance ...
On Spin-Statistics and Bogoliubov Transformations in Flat Spacetime With Acceleration Conditions

Good, Michael R.R. (2013-02-01)

A single real scalar field of spin zero obeying the Klein-Gordon equation in flat spacetime under external conditions is considered in the context of the spin-statistics connection. An imposed accelerated boundary on the ...
ON TEMPERATURE-DEPENDENT SMALL-SIGNAL MODELLING OF GAN HEMTS USING ARTIFICIAL NEURAL NETWORKS AND SUPPORT VECTOR REGRESSION

Jarndal, Anwar; Husain, Saddam; Hashmi, Mohammad (IET Microwaves, Antennas & Propagation, 2021-04-09)

Machine learning‐based efficient temperature‐dependent small‐signal modelling ap proaches for GaN high electron mobility transistors (HEMTs) are presented by the authors here. The first method is an artificial neural ...
On the Buckling of Euler Graphene Beams Subject to Axial Compressive Load

Elgindi, Mohamed B. M.; Wei, Dongming; Soukiassian, Yeran; Liu, Yu (World Journal of Engineering and Technology, 2014)

In this paper, we consider the buckling of an Euler-Bernoulli graphene beam due to an axial compressive load. We formulate the problem as a non-linear (eigenvalue) two-point boundary value problem, prove some properties ...
ON THE CAUCHY PROBLEM FOR A NONLOCAL NONLINEAR SCHRÖDINGER EQUATION

Wang, Hongwei; Esfahani, Amin (Discrete and Continuous Dynamical Systems, 2022-12)

This paper considers the one-dimensional Schrödinger equation with nonlocal nonlinearity that describes the interactions of nonlinear dispersive waves. We obtain some the local well-posedness and ill-posedness result ...
ON THE DUALITY OF SCHWARZSCHILD-DE SITTER SPACETIME AND MOVING MIRROR

Fernandez-Silvestre, Diego; Foo, Joshua; Good, Michael R.R. (Classical and Quantum Gravity, 2022)

The Schwarzschild-de Sitter (SdS) metric is the simplest spacetime solution in general relativity with both a black hole event horizon and a cosmological event horizon. Since the Schwarzschild metric is the most ...
On the Energy Efficiency in Multi-user Multi-relay Coded Network

Qi, Nan; Xiao, Ming; Tsiftsis, Theodoros A.; Cao, Phuong L.; Skoglund, Mikael; Li, Lixin (2016)

In this paper, the energy efficiency (EE) of a cooperative diversity system with maximum diversity network coding (MDNC) is studied. In the considered system, channel state information (CSI) is only available at the ...
On the energy efficiency in multi-user multi-relay coded network

Qi, Nan; Xiao, Ming; Tsiftsis, Theodoros A.; Cao, Phuong L.; Skoglund, Mikael; Li, Lixin (Institute of Electrical and Electronics Engineers Inc., 2016-06-27)

In this paper, the energy efficiency (EE) of a cooperative diversity system with maximum diversity network coding (MDNC) is studied. In the considered system, channel state information (CSI) is only available at the receivers ...
On the Global Solvability of a Class of Fourth- Order Nonlinear Boundary Value Problems

Elgindi, Mohamed B. M.; Wei, Dongming (Mathematics Faculty Publications, 2012)

In this paper we prove the global solvability of a class of fourth-order nonlinear boundary value problems that govern the deformation of a Hollomon’s power-law plastic beam subject to an axial compression and nonlinear ...
On the Higher Order Statistics of the Channel Capacity in Dispersed Spectrum Cognitive Radio Systems Over Generalized Fading Channels

Tsiftsis, Theodoros A.; Foukalas, Fotis; Karagiannidis, George K.; Khattab, Tamer (IEEE Transactions on Vehicular Technology, 2016-05-01)

This work is devoted to the study of dispersed spectrum cognitive radio (CR) systems over independent and nonidentically distributed (i.n.i.d.) generalized fading channels. More specifically, this is performed in terms of ...
On the Joint Impact of Hardware Impairments and Imperfect CSI on Successive Decoding

Miridakis, Nikolaos I.; Tsiftsis, Theodoros A. (IEEE Transactions on Vehicular Technology, 2016)

In this paper, a spatial multiplexing multiple-input multiple-output (MIMO) system when hardware along with RF imperfections occur during the communication setup is analytically investigated. More specifically, the scenario ...
On the Local Origins of the Soviet Attack on “Religious” Waqf in the Uzbek SSR (1927)

Penati, Beatrice (Acta Slavica Iaponica, 2015)

This article studies when, how, and by whom the decision to nationalise land properties the rent from which supported mosques, shrines, and hostels (rather than schools) was first taken in Soviet Uzbekistan. Through a ...
ON THE MODELLING, ANALYSIS, AND DESIGN OF A SUBOPTIMAL CONTROLLER FOR A CLASS OF WIND/PV/BATTERY BASED DC MICROGRID

Arabshahi, Mohammad Reza; Torkaman, Hossein; Bagheri, Mehdi; Keyhani, Ali (IET Renewable Power Generation, 2021-11-19)

This study deals with the comprehensive modelling, analysis, and control of a DC microgrid (MG) in islanded mode. The proposed DC MG comprises a wind turbine, a photovoltaic (PV) source, battery storage, DC/DC source, and ...
ON THE PERSISTENCE OF SPATIAL ANALYTICITY FOR THE BEAM EQUATION

Dufera, Tamirat T.; Mebrate, Sileshi; Tesfahun, Achenef (Journal of Mathematical Analysis and Applications, 2022)

Persistence of spatial analyticity is studied for solution of the beam equation utt + (m + Δ2) u + |u| p−1u = 0 on Rn × R. In particular, for a class of analytic initial data with a uniform radius of analyticity σ0, we ...
ON THE PROPERTIES OF A DEFORMED EXTENSION OF THE NUT SPACE-TIME

Narzilloev, Bakhtiyor; Malafarina, Daniele; Abdujabbarov, Ahmadjon; Bambi, Cosimo (Springer Verlag, 2020-08)

We consider a class of space-times given by a stationary extension of the Zipoy–Voorhees metric that was found by Halilsoy. We show that the solutions do not describe rotating sources but must be interpreted, similarly to ...
On the QR decomposition of backslashfancyscript H -matrices

Benner, Peter; Mach, Thomas (Computing (Vienna/New York), 2010-06-09)

The hierarchical ( backslashfancyscriptH -) matrix format allows storing a variety of dense matrices from certain applications in a special data-sparse way with linear-polylogarithmic complexity. Many operations from linear ...