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The paper presents the progress of our study of the whole process mathematical model for a supercritical coal-fired power plant. The modelling procedure is rooted from thermodynamic and engineering principles with reference to the previously published literatures. Model unknown parameters are identified using Genetic Algorithms (GAs) with 600MW supercritical power plant on-site measurement data. The...
In this paper we present a sequential computation method of the state vector, for pre-established time intervals or punctually. Based on discrete circuit models with direct or iterative companion diagrams, the proposed method is intended to a wide range of analog dynamic circuits: linear or nonlinear circuits with or without excess elements or magnetically coupled inductors. Feasibility, accessibility...
The objective of this research work is the design and implementation of a post-processing algorithm or “search and localization engine” that will be used for the characterization of partial discharges (PD) and the location of the source in order to assess the condition of paper-oil insulation systems. The PD is measured with two acoustic sensors (ultrasonic PZT) and one electric sensor (HF ferrite)...
Wind energy has been focused as an inexhaustible and abundant energy source for electrical power generation and its penetration level has increased dramatically worldwide in recent years. However, its intermittence nature is still a universally faced challenge. As a possible solution, energy storage technology hybrid with renewable power generation process is considered as one of options in recent...
The purpose of this chapter is to present how to determine and reduce specific absorption rate (SAR) on mobile phone user. Both experimental measurement technique and a numerical computing method are expressed here. Furthermore, an application on reduction of SAR value induced in human head is carried out with numerical computing. Mobile phone working at 900 MHz frequency shielded with copper is considered...
The chapter presents an efficient way to mitigate the magnetic field resulting from the three-phase 500 kV single circuit overhead transmission line existing in Egypt, by using a passive loop conductor. The aim of this chapter is to reduce the amount of land required as right-of-way. The chapter used an accurate method for the evaluation of 50 Hz magnetic field produced by overhead transmission lines...
Recent approaches for time-domain analysis of lumped circuits deal with differential-algebraic-equation (DAE) systems instead of SPICE-type resistive models. Although simple and powerful, DAE models based on modified nodal approaches require some restrictions related to redundant variables or circuit topology. In this context, the paper proposes an improved version that allows treating nonlinear analog...
A new version of Absolute Polar Duty Cycle Division Multiplexing transmission scheme over Wavelength Division Multiplexing system is proposed. We modeled and analyzed a method to improve the performance of AP-DCDM over WDM system by using Dual-Drive Mach–Zehnder-Modulator (DD-MZM). Almost 4.1 dB improvement in receiver sensitivity of 1.28 Tbit/s (32 × 40 Gbit/s) AP-DCDM-WDM over 320 km fiber is achieved...
The importance of wireless communications has been growing. Performance is a crucial issue, resulting in more reliable and efficient communications. Security is equally important. Laboratory measurements are made about several performance aspects of Wi-Fi (IEEE 802.11a, b, g) WEP point-to-point links. A contribution is given to performance evaluation of this technology, using two types of access points...
This chapter analyzes the specific absorption rate (SAR) induced in human head model of various sizes by a mobile phone at 900 and 1800 MHz. Specifically the study is considering in SAR between adults and children. Moreover, these differences are assessed for compliance with international safety guidelines. Also the effects of these head models on the most important terms for a mobile terminal antenna...
Wireless communications have been increasingly important. Besides Wi-Fi, FSO plays a very relevant technological role in this context. Performance is essential, resulting in more reliable and efficient communications. A 1.14 km FSO medium range link has been successfully implemented for high requirement applications at Gbps. An extended experimental performance evaluation of this link has been carried...
WLAN fingerprint-based positioning systems are a viable solution for estimating the location of mobile stations. Recently, various machine learning techniques have been applied to the WLAN fingerprint-based positioning systems to further enhance their accuracy. Due to the noisy characteristics of RF signals as well as the lack of the study on environmental factors affecting the signal propagation,...
A non-linear image filtering scheme is described. The scheme is inspired by the dual domain bilateral filter but owing to much simpler pixel weighting arrangement the computation of the result is much faster. The scheme relies on two principal assumptions: equal weight of all pixels within an isotropic kernel and a constraint imposed on the intensity of pixels within the kernel. The constraint is...
A new blind speech separation (BSS) method of convolutive mixtures is presented. This method uses a sample-by-sample algorithm to perform the subband decomposition by mimicking the processing performed by the human ear. The unknown source signals are separated by maximizing the entropy of a transformed set of signal mixtures through the use of a gradient ascent algorithm. Experimental results show...
Thrombosis of implanted heart valve is a rare but lethal complication for patients with mechanical heart valve. Echocardiogram of mechanical heart valves is necessary to diagnose valve thrombosis definitely. Because of the difficulty in making early diagnosis of thrombosis, and the cost of diagnosis equipment and operators, improving noninvasive, cheap and simple methods to evaluate the functionality...
Non-preemptive schedulers remain a very popular choice for practitioners of resource constrained real-time embedded systems. This chapter is concerned with the non-preemptive version of the Earliest Deadline First algorithm (npEDF). Although several key results indicate that npEDF should be considered a viable choice for use in resource-constrained real-time systems, these systems have traditionally...
Modern construction management require real-time and accurate information for sharing among all the parties involved to undertake efficient and effective planning as well as execution of the projects. Research projects conducted during the last decade have concluded that information management is a critical factor in construction project performance and plays an essential role in managing the construction...
Active collaboration is undoubtedly one of the most important aspects within e-business. In addition to companies collaborating on ways to increase productivity and cut costs, there is a growing need for in-depth discussion and negotiations on their individual and collective security. This paper extends previous work on a tool aimed at supporting the cross-enterprise security negotiations process...
In this article (based on “Kyrillidis L, Mayes K, Markantonakis K (2010) Web server on a SIM card. Lecture notes in engineering and computer science: Proceedings of the World Congress on Engineering 2010, WCE 2010, 30 June–2 July 2010, London, UK, pp 253–259”) we discuss about the integration of a web server on a SIM card and we attempt an analysis from various perspectives (management, operation,...
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