The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The present work was devoted to investigate the kinetic behavior of an industrial-scale ebullated bed reactor, licensed by Axens Co., in Lukoil refinery at Bourgas, Bulgaria. Another objective of the present work is to formulate a steady state mathematical model to predict the profile of products along the reactor, and to investigate effects of the operating variables [e.g., operating temperature,...
This paper provides a general dynamic mathematical model of Multiple Unified Power Flow Controllers (UPFC) development; those installed into any selected lines of a Multi-Machine power system network. The development will be based on two UPFCs installed into the New England Power System (NEPS) grid. This mathematical development applicable on any Multi-Machine network based on the required number...
This paper provides a procedure to analyze and model EEG (electroencephalogram) signal as a time series using ARIMA-GARCH to predict an epileptic attack. The heteroskedasticity of EEG signal is examined through the ARCH or GARCH, (Autoregressive conditional heteroskedasticity, Generalized autoregressive conditional heteroskedasticity) test. The best ARIMA-GARCH model in AIC sense is utilized to measure...
Mobile networks consist of one or more mobile IP-subnets and is viewed as one connected unit to the internet via one or more Mobile Router (MR). When MR is connecting to the other MR in the other mobile network, it makes a structure known as Nested Mobile Network. In this structure each level of connected router has a Bi-directional tunnel between each pair of MR and its Home Agent (HA) must be established...
A PV array is composed of a number of series and parallel modules to meet the voltage, current and power requirements. In this paper, a modified Perturb and Observe (P&O) Maximum Power Point Tracking (MPPT) technique is presented. The modified P&O is used in the maximum power point tracking of a partially shaded PV system. The electrical performance of the proposed partial shaded P&O MPPT...
Enhancement of fault ride through capability of Doubly Fed Induction Generator (DFIG) is demanding issue in developed countries. In this paper crowbar circuit is implemented for limitation of fault current while the Adaptive Sliding Mode Controller (ASMC) & Adaptive Fuzzy controller (AFC) based on Levenberg-Marquardt algorithm is proposed to enhance fault ride through capability. The Adaptive...
The main aim of this paper is to investigate the performance of two iterative methods i.e. Gauss-Seidel (GS) and 2-Point Explicit Group (2-EG) in solving dense linear system associated with the numerical solution of first kind linear Fredholm integral equations. The formulation and implementation of the both methods are presented. In addition, some numerical results are also included to verify the...
Inverse problems arise in various areas of science and engineering. These problems are not only difficult to solve numerically, but they also require a large amount of computer resources both in time and memory. It is therefore not surprising that inverse problems are often solved using techniques from high-performance computing. We consider the parallelization of an inverse problem in the field of...
A smart microwave sensor for non-destructive thickness measurement of paint and dielectric coating of metallic plates is presented. The sensor is based on low cost microstrip transmission line with a Complementary Split-Ring Resonator (CSRR) in the ground plan. The CSRR sensor experiences a frequency shift proportional to the thickness of a dielectric layer backed with metallic plate as described...
The power conversion from variable AC voltage into a desired AC voltage with fixed magnitude and fixed frequency is attracting more attention especially in case of grid-connected wind generation system. Indeed, the Direct Matrix Converter (DMC) can be used as a suitable solution for such AC/AC conversion to fulfill the requirement of the output voltage with desired magnitude and frequency. This paper...
Remote energy efficiency for wireless micro sensor devices in multimedia, signal processing and communication technologies is of paramount interest not only for ensuring continuous network operation despite primary battery limitations, but also for reducing carbon footprint in communication systems. Increasing demands of energy supply for micro devices, in particular, with the advance of complex multimedia...
Power system stabilizers (PSSs) are added to excitation system to enhance the damping during low frequency oscillations. This paper presents a study of fuzzy logic power system stabilizer (PSS) for stability enhancement of a single machine power system. In order to accomplish the stability enhancement, two approaches to design Fuzzy Logic Power System Stabilizers (FLPSS) as follows: 1-FLC1 has Speed...
A good model of object shape is essential in applications such as segmentation, object detection, inpainting and graphics. For example, when performing segmentation, local constraints on the shape can help where the object boundary is noisy or unclear, and global constraints can resolve ambiguities where background clutter looks similar to part of the object. In general, the stronger the model of...
In this paper, an aircraft roll control system based on design an autopilot that controls the roll angle of an aircraft is modeled using Matlab/Simulink. Firstly, modeling phase begins with a derivation of suitable mathematical model to describe the lateral directional motion of an aircraft. Then, the Linear Quadratic Controller (LQR) and Fuzzy Logic Controller (FLC) are developed for controlling...
This paper discusses the aerodynamics characteristics of Blended Wing Body — Baseline II E2, unmanned aerial vehicle aircraft. A computational method, Computational Fluid Dynamic (CFD) Star CCM+ software has been performed to obtain the aerodynamics characteristic of the BWB. The aerodynamic characteristics prediction of BWB-Baseline II E2 aircraft was obtained through CFD analysis using unstructured...
This paper proposes a cooperative spectrum sensing algorithm based on distributed fusion strategy and maintained probability of false alarm for cognitive radio. It further introduces a reporting strategy that discusses how cooperative sensing in distributed manner can select among possible candidate nodes in order to reduce bandwidth requirement. We adopted a dynamic distributed architecture for cooperative...
The grounded metal guard rings are useful in isolating the coupling of inductors to other on-chip inductors as well as other components. These guard rings influence the performance of the inductor itself. This paper investigates and analyzes the electromagnetic (EM) coupling of the guard ring to the inductor and investigates its impacts on its performance parameters such as the quality-factor (Q)...
This paper describes the implementation of fuzzy based Handwriting Recognition (HR) system in VHDL. Key motivation of the design is to reduce computational complexity and performance enhancement. Fuzzy intelligent technique is used to tackle inherent ambiguities in different handwriting recognition. This system is capable of recognizing handwritten characters such as one segment, distinguish characters...
In orthogonal frequency division multiplexing (OFDM) system, the frequency offset in mobile radio channel leads to the loss of sub-carrier orthogonality which causes inter-carrier interference (ICI). As a result, the performance of the system will degrade. The authors have proposed an efficient scheme for ICI cancellation. Simulation results show that the proposed scheme outperforms the conventional...
Electricity demand forecasting is known as one of the most important challenges in managing supply and demand of electricity and has been studied from different views. Electrical load forecast might be performed over different time intervals of short, medium and long term. Various techniques have been proposed for short term, medium term or long term load forecasting. In this study we employ Adaptive...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.