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The present work aims to contributing to the perspective of using lead acid batteries for the storage of energy produced by photovoltaic plants. After a review of different models tackling the performance of lead acid batteries, we opted for the electrochemical approach and based our study on the evolution of the electrolyte specific gravity during charge/discharge cycling tests of a 12 V lead acid...
In a previous work, a fully predictable and a sub-linear-runtime heuristic for the multiplication by a constant based on the radix-2r arithmetic was developed. It is called RADIX-2r. In this paper we focalize on the optimization of the average number of additions (Avg) to make RADIX-2r more competitive with the existing heuristics. In this work, the obtained results are compared only to the standard...
In this paper, we present semi-analytical modeling and optimization approaches based on genetic algorithm computation to improve the electrical performance of amorphous SiGe thin-film solar cell including multi-trench region. The key idea behind the proposed investigation is to model the electrical efficiency using 2D numerical database and analytical fitting. Semi-analytical expression of the efficiency...
This paper presents the design of a Small Size ultra-wideband microstrip patch antenna. The antenna, which is microstrip-line fed, has a partial ground plane flushed with the feed line. The substrate is based on the inexpensive FR4 material, and the patch is circular in shape with a rectangular slot incorporated. The antenna was designed, simulated and optimized over HFSS (high frequency structures...
In this paper, the main idea of the proposed method is to build a secure image transmission combining watermarking and encryption techniques. From one hand, it consists of an image embedded in another one using a Discrete Wavelet Transform (DWT) to guarantee the process of watermarking. Then, the resultant watermarked image is encrypted using the master 4D discrete-time hyperchaotic Henon maps. From...
A simple method based on that described in the international standard NE ISO 5167 is implemented to determine the mass flow rate and other parameters. The control procedures of calculation used for every measurement instrument will be developed according to the conditions of working and material available on site.
The students' portal represents a major part among university information systems. Lack of components distribution is a gap that leads to many problems in students' portals in most of universities worldwide, which is due to tightly-coupled components in the current portal framework. This paper reviews the common features of the general portal structure. A comparison between the traditional students'...
Parabolic trough solar thermal power plant is considered as one of the most mature, successful, proven and attractive technologies to produce electricity. The aim of this present study is to compare parabolic trough solar power plant with integrated thermal storage and fossil fuel backup system using two different heat transfer fluid (HTF); synthetic oil and molten salt. The comparison in their design,...
Facial demographic classification is an attractive topic in computer vision. Attributes such as age and gender can be used in many real life application such as face recognition and internet safety for minors. In this paper, we present a novel approach for age estimation and gender classification under uncontrolled conditions following the standard protocols for fair comparaison. Our proposed approach...
A triple band bowtie antenna with multiband operations for Long-Term Evolution (LTE2300/2500) and WLAN (5.8 GHz) applications is presented and studied in this paper. The antenna is designed using transmission line method; this antenna is suitable to be embedded inside the casing of the laptop computer. Three operating bands covering 2.3ߝ2.4, and 2.5ߝ2.69 GHz for the LTE and 5.725ߝ5.852 GHz for WLAN...
The aim of this paper is to present an approach to economically improve the overall performance, dependability, reliability and availability of electricity generation power plants in south of Algeria by integrating renewable energy. A prefeasibility study of a hybrid 9×1.9MW Diesel power generation plant in Tindouf (Algeria) from conventional and renewable energy sources will help to improve the performances...
This paper presents a numerical study of heat transfer during melting of phase change material (PCM) encapsulated in spherical container of thermal energy storage, with dispersion of solid nanoparticles within phase change material. The finite volume method has been used to resolve the energy equation in both solid and liquid phases in transient regime. The mathematical model is based on the conjugate...
In the present work, thin films of zinc oxide (ZnO) were deposited by sol-gel associated to spin coating method. Sol was prepared using zinc acetate, 2-Methoxyethanol and monoethanolamine (MEA) as starting materials. Films were grown using solgel method associated to spin coating method. ZnO films morphology was investigated by Scanning Electron Microscope. SEM images reveal that films are composed...
This paper investigates a new and simple control design for underatuated mechanical system with control diagram flow in tree structure. In such systems, the control input is related to more than one degree of freedom simultaneously. The idea is to include in the control law expression terms that act on theses variables at the same time. The procedure is applied to the stabilization of the popular...
The One Class Auto Associative Neural Network (AANN) has been investigated for solving various problems. Nonetheless, it is sensitive to the presence of outliers in the training set, which is known problem for one-class classifiers. For this, attempts have been done via proposing the use of efficient kernel and ensemble method to reduce the effect of outliers for one class support vector machine classifier...
Todays biometric systems are vulnerable to spoof attacks made by non-real faces. The problem is when a person shows in front of camera a print photo or a picture from cell phone. We study in this paper an anti-spoofing solution for distinguishing between 'live' and 'fake' faces. In our approach we used overlapping block LBP operator to extract features in each region of the image. To reduce the features...
Recently, numerical simulations have been used to study important physical phenomena in microfluidics application. A topic of great interest in this field is that of microdrops manipulation, which is applied to lab-on-a-chip devices for biomedical testing and synthesis. Computational fluid dynamics (CFD) analysis of microdrops flow was performed to simulate the design channel of Yung-Chieh et al....
This paper addresses the problem of speech quality enhancement and acoustic noise reduction by adaptive blind source separation algorithms. Recently, several two-channel forward-and-backward structures have been proposed for acoustic noise reduction based on normalized least-mean-square (NLMS) algorithm. The backward structure presents the good performance compared with its direct version (forward)...
Adaptive modulation requires knowledge of channel state information (CSI) at the receiver by inserting pilot symbols in the transmitted signal. In This paper we focuses on the Adaptive Coded Modulation (ACM) system, where the data symbols and power allocation variable are optimized. The pilot spacing and power allocation are adaptively changed in an optimal way according to the conditions channel...
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