Browsing 007 Πολυτεχνική Σχολή / Faculty of Engineering by Title
Now showing items 5228-5247 of 5273
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Conference Object
Wireless data broadcast in systems of hierarchical cellular organization
(2003)In recent years, both wireless data broadcast (WDB) and hierarchical cell structure (HCS) have attracted the attention of the scientific community, yet they have been treated as entirely separate research topics. This paper ...
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Conference Object
Wireless fading channels: Modeling, estimation and identification from measurements
(2005)This paper is concerned with modeling and system identification of wireless channels. The models employed are in state space form, while the identification method uses the Expectation-Maximization (EM) algorithm and Kalman ...
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Article
Wireless information and power transfer in cooperative networks with spatially random relays
(2014)
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Article
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Book Chapter
Wireless Power Transfer
(John Wiley & Sons, Ltd, 2018)Large-scale wireless networks are characterized by the existence of multi-user interference due to the concurrent transmission of the network's terminals. In networks where the main focus is wireless power transfer (WPT), ...
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Conference Object
Wireless Powered Cognitive Communications with Asynchronous Channel Access
(2019)Future machine type networks, such as the Internet of Things (IoT), will be characterized by sporadic transmissions of short packets. In this paper, we study an asynchronous channel access model performed by a primary ad ...
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Article
A Wireless Powered Feedback Protocol for Opportunistic Beamforming Using Rectenna Arrays
(2018)This paper proposes an opportunistic beamforming (OBF) protocol with limited feedback in the context of wireless powered communication networks. The terminals are randomly deployed around an access point (AP) and are ...
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Article
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Article
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Conference Object
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Article
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Article
X-Ray diffraction investigations of magnetron sputtered TiCN coatings
(1995)X-ray diffraction measurements were performed on titanium carbonitride coatings produced in an electron enhanced, unbalanced magnetron system. The films were deposited onto AISI 316 stainless steel substrates with an argon ...
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Book
Xenobiotics in the urban water cycle: mass flows, environmental processes, mitigation and treatment strategies
(Springer, 2010)
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Article
Yield behavior of commercial Al-Si alloys in the semisolid state
(2004)Systematic experimental work and modeling efforts have been conducted to characterize the yield behavior of commercial aluminum alloys in the semisolid state. In this study, extensive compression experiments were performed ...
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Conference Object
A zero beam-squinting leaky-wave antenna using NRI-TL metamaterials
(Institute of Electrical and Electronics Engineers Inc., 2015)A planar zero beam-squinting leaky-wave antenna is proposed at 5 GHz, consisting of a periodic arrangement of negative-refractive-index transmission-line (NRI-TL) metamaterial unit cells. The antenna is centre-fed through ...
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Article
Zero-Delay Rate Distortion via Filtering for Vector-Valued Gaussian Sources
(2018)We deal with zero-delay source coding of a vector-valued Gauss-Markov source subject to a mean-squared error (MSE) fidelity criterion characterized by the operational zero-delay vector-valued Gaussian rate distortion ...
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Article
Zn3N2nanowires: Growth, properties and oxidation
(2013)Zinc nitride (Zn3N2) nanowires (NWs) with diameters of 50 to 100 nm and a cubic crystal structure have been grown on 1 nm Au/Al2O3via the reaction of Zn with NH3including H2between 500°C and 600°C. These exhibited an optical ...
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Conference Object
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Book
Ανάλυση κατασκευών: σύγχρονες μέθοδοι με χρήση ηλεκτρονικών υπολογιστών
(Εκδόσεις Παπασωτηρίου, 2009)
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Book