HADDI Bakhti

ZOUAOUI, Chahinez , MELIANI, Nassim Safwan

Étude et implémentation d’un système de détection de fuite d’eau base sur un modèle développé

BOUCHELIG, Siham , CHAKER, Amina

Conception d’une antenne bi-bande pour des applications 5G

GUELMINE, Nora Sakina , LADEJNEF, Manel

Simulation et conception d’un Filtre pour des applications médicales (Signaux ECG)

CHARIKH, YOUSRA , DOUCENE, HAFSA

Implémentation d’un système de détection De fuite autour d’un système de traitement De signal numérique

LAGUEAGUE Seyfeddine , OUALI Elhadj Taieb

Détection des fuites dans les réseaux de distribution d'eau

Imane, ZEGAAR , Aicha, GHERBI

Etude et conception d’un filtre passe bande à base de résonateur à saut d’impédance pour les systèmes de communication sans fil

Hana, KHIREDDINE

Etude et conception d’un filtre RF ULB pour des applications en télécommunications

Water distribution networks around the world suffer from leaks. These are due to the movements of various agents such as ground movements, and vibrations caused by road traffic without forgetting the nature of the ground. For this, permanent control is needed. In this work, we have developed a LabVIEW interface for the acquisition and processing of signals received from pressure transmitters. A Wifi system for transmitting and receiving signals from the pressure transmitters is used. To analyze signals to remotely detect anomalies that may occur on the network. The work is divided into two parts: a practical or hard part and a soft part. The hard one is used to obtain the signals containing the leakage information. The soft part is based on the application of signal processing techniques for the detection and location of the exact position of the leakage and therefore minimize the amount of water that is lost. Keywords: Leak, LabVIEW, WiFi, Detection, WDNS.

Citation

Haddi BAKHTI , ,(2023-07-10), Design of leaks detection and localization in WDNs based on LabVIEW and pressure signals,INTERNATIONAL CONFERENCE ON NONLINEAR SCIENCE AND COMPLEXITY, 2023,Istanbul-Turkey

Water is a precious, sometimes scarce resource that is crucial for all kinds of life. In the last two decades, the water demand has far exceeded the supply in many countries. It is also worth mentioning that distribution networks are constantly increasing. According to an international study 20-50% of the produced quantities are lost due to leaks. These leaks can cause significant economic losses and multiple water contaminations that are carried as a major health risk for the citizen. Therefore, network managers are always looking for fast and inexpensive harmless leak detection systems. The rapid detection of a leak in underground pipes is widely taken into account in the performance evaluation of water supply systems. In addition, detection methods should not interfere with the normal operation of water transport. To minimize the effect of false alarms (FA) that have a costly effect on infrastructure. These false alarms are produced by the use of the most widely used acoustic detectors in the world, which are usually based on the signal correlation technique to know the exact location of the leak in relation to one of the sensors. In this work, we present a new leak detector applied to a prototype pipe using highly sensitive pressure transmitters. For this purpose, we have applied the wavelet technique (DWT) for denoising our non-stationary signals from these transmitters. The STFT (Short time Fourier transform) will be used for the analysis of these non-stationary and non-linear signals coming from the leaks to know the exact position of the leak. Validation tests have proven the efficiency of our detector. Keywords: Leak, DWT: STFT, Detection, WDNS.

Citation

Haddi BAKHTI , ,(2023-07-10), DWT and STFT applied to Detect and locate leaks in WDNs,INTERNATIONAL CONFERENCE ON NONLINEAR SCIENCE AND COMPLEXITY, 2023,Istanbul-Turkey

The design of leak detection systems that occur on water pipes is a priority area of applied research that has an economic and health impact on the future of any nation. The various control systems and tools that currently exist throughout the world are designed to ensure permanent and effective monitoring of natural resources that have become rare and precious. The determining factor for the choice of a good detector is the cost in the first place, flexibility, and speed of processing. In this work, the basic idea is to simultaneously acquire from a new inexpensive electronic device two signals from two pressure transmitters installed on a prototype pipe carried out at the laboratory. These signals are usually immersed in noise. For this, denoising by an appropriate digital filter is indispensable. In our case, the Savitzky-Golay filter (S.G) presents its efficiency. The denoising performances are obtained from the calculation of SNR. The denoised signals are analysed to confirm the presence of the leak in the case of its existence. Mathematical equations are applied to determine the exact position of the leak with regards to one of the sensors. Validation tests are required to determine the position of the leak when the difference time between the signals is known.

Citation

Haddi BAKHTI , ,(2022), SG Filter and Speed of pressure wave applied to locate leak in water pipes netwoks,ICATEEE 2022,M'sila,Algeria

Nowadays, the generalization of wireless communication systems and the need to miniaturize antennas to allow their integration into small objects at ultra-high frequencies is growing. At these frequencies, the antenna is the bulkiest component and its miniaturization constitutes one of the most important current challenges for designers of communicating objects. The main objective of our work is the design of a dual-band patch antenna working for fifth-generation systems. For this purpose, we designed a miniature antenna having two resonance frequencies, one around 7GHz and the other around 28GHz. For this, our work is based on a classic rectangular patch antenna. Miniaturization techniques and ground plane deformation (GDS) are used to obtain the best performance. A parametric study was performed to see the most influential parameters to achieve the desired requirements. The influence of the geometrical parameters of the antenna on the resonance frequency, bandwidth, and directivity has been taken into consideration. The results obtained showed a good performance of the designed antenna.

Citation

Haddi BAKHTI , ,(2022), Design of a miniature bi-band patch antenna with asymmetrical feedline for 5G applications,ICATEEE 2022,M'sila,Algeria

The pipeline system is the most essential part of transporting potable water. In other words, pipes are the most crucial component of the water distribution system. Because of several factors, they suffer from holes in which water is lost, and therefore an economic loss to states and humanity. Responsible for the water distribution networks always try to minimize the damage. By working to find the most effective way to detect leaks in these networks. This article centers on a mathematical model of a hydraulic system that aims to locate leakage in water transmission pipes. Several optimization techniques can be used. We opted for the BBO (biogeography-based optimization) method because of its performance, in particular the execution time of its algorithm. This method is applied to determine the two parameters of the model (friction and dynamic viscosity) to obtain a good localization. We take GA as a method compared method with BBO.

Citation

Haddi BAKHTI , ,(2022), Parameterization and Validation of the Physical Coefficients of a WDNs by BBO,ICATEEE 2022,M'sila,Algeria

Water distribution systems (WDNs) suffer from leakage problems. The latter can cause damage to infrastructure and also act on public health by the penetration of microbes of waterborne diseases transmissible through the orifices of leaks as soon as a drop in pressure occurs. For this purpose, the network managers always look for the best devices to detect and locate in time the anomaly of the networks as soon as it appears. In order to realize a system of detection and location of leakage a prototype circuit was realized equipped with pressure sensors and a system of acquisition based on a Digital Signal Processor (DSP). Pressure measurements for specific distances were carried out. A digital filter was applied for denoising. Pairs of pressure values before and after leakage are applied to a mathematical model for localization. We opted to use nonlinear regression (RNL) for the determination of nonmeasurable physical parameters based on pre-localized leak positions. Validation tests are performed to demonstrate the effectiveness of the model. In our study, a divergence of the model used was found.

Citation

Haddi BAKHTI , ,(2022), RNL used for the verification of the efficiency of a localization model in a real WDNs,ICATEEE 2022,M'sila,Algeria

The dimensioning of photovoltaic systems is the major concern of researchers and power industry practitioners. This aims to improve energy efficiency and protect the conversion units by a consistent assessment of power conditioning circuits and interconnections for the PV application. In this context, this paper sets out to fulfill detailed modeling and control steps of a standalone photovoltaic (PV) power system with energy storage, according to practical specifications of the load, PV generation unit, and battery pack. The main goal is to estimate all unknown parameters, as the diode ideality factor and revers saturation current, the controller, and the PV link. The PV link interfacing the PV source circuit to the PV-side converter (PVSC) provides a filtering function to maintain a steady voltage at the link. The charge controller used in the PV-side converter is a DC/DC buck converter. It transfers the PV power to the battery and supplies the load. Using pulse- width modulation (PWM) technical, of which the switching duty cycle is the control-input variable; the PVSC power-conditioning circuit is permanently controlled by the maximum power point tracking (MPPT) algorithm to achieve the maximum energy. The battery pack voltage is properly maintained by the charge controller and specified to match the load voltage rating, to avoid a high ratio of voltage conversion. A method is proposed to integrate both the MPPT function and the battery cycle charge. The PV generator output and the power conditioning circuits, mainly constructed from switching- mode power converters, are nonlinear. An averaged model is then derived for dynamic analysis and controller synthesis, using the state-space averaging and linearization method. A PV array of nine PV modules configured into three strings is used in this application to demonstrate the effectiveness of modeling, design, control, and simulation. Simulation model for the controller and power interface is built and developed in short term, using the fundamental blocks of Matlab Simulink.

Citation

Haddi BAKHTI , Messaoud MAYOUF , , (2021), Optimum Parametric Identification of a Stand-Alone Photovoltaic System with Battery Storage and Optimization Controller Using Averaging Approach, Journal Européen des Systèmes Automatisés, Vol:54, Issue:1, pages:63-71, International Information and Engineering Technology Association (IIETA)

In the present work, a dynamic stochastic method is proposed and used for the synthesis of uniform linear antenna arrays. The proposed method combines the classical invasive weeds (IWO) and the mutation process, which makes it robust, and simple and shows flexibility to be adapted. The dynamic IWO applies the mutation process in the calculation of standard deviation during the spatial dispersal process of produced seeds while keeping the mean at the parent plants. In the mutation process, if special conditions were achieved, the standard deviation would be re-initialized. This proposed method tries to achieve an optimal array pattern by acting on the relative amplitude excitation of each element in the linear array for optimal inter-element spacing. The optimal array pattern has deep or broad nulls in some directions of interferences with low sidelobes level. The objective of the synthesis is to get amplitude excitations with a low dynamic range ratio (DRR), which facilitates the design of a beamforming feed network. To illustrate the robustness of the proposed method, numerical examples are presented and compared with the obtained results using the bees algorithm (BA), bacterial foraging algorithm (BFA), real genetic algorithm (RGA), and the corresponding reference array pattern for each example.

Citation

Haddi BAKHTI , , (2021), A Dynamic Invasive Weeds Optimization Applied to Null Control of Linear Antenna Arrays with Constrained DRR, Advanced Electromagnetics, Vol:10, Issue:1, pages:51-62, Advanced Electromagnetics

In the present work, a dynamic stochastic method is proposed and used for the synthesis of uniform linear antenna arrays. The proposed method combines the classical invasive weeds (IWO) and the mutation process, which makes it robust, simple and shows flexibility to be adapted. The dynamic IWO applies the mutation process in the calculation of standard deviation during the spatial dispersal process of produced seeds while keeping the mean at the parent plants. In the mutation process, if special conditions were achieved, the standard deviation would be re-initialized. This proposed method tries to achieve an optimal array pattern by acting on the relative amplitude excitation of each element in the linear array for an optimal inter-element spacing. The optimal array pattern has deep or broad nulls in some directions of interferences with low sidelobes level. The objective of the synthesis is to get amplitude excitations with low dynamic range ratio (DRR), which facilitates the design of beamforming feed network. To illustrate the robustness of the proposed method, numerical examples are presented and compared with the obtained results using bees algorithm (BA), bacterial foraging algorithm (BFA), real genetic algorithm (RGA), and the corresponding reference array pattern for each example.

Citation

ELhadi KENANE , Haddi BAKHTI , Haddi BAKHTI , Farid Djahli, , (2021), A Dynamic Invasive Weeds Optimization Applied to Null Control of Linear Antenna Arrays with Constrained DRR, Advanced Electromagnetics, Vol:10, Issue:1, pages:52-60, Advanced Electromagnetics

In the present work, a dynamic stochastic method is proposed and used for the synthesis of uniform linear antenna arrays. The proposed method combines the classical invasive weeds (IWO) and the mutation process, which makes it robust, simple and shows flexibility to be adapted. The dynamic IWO applies the mutation process in the calculation of standard deviation during the spatial dispersal process of produced seeds while keeping the mean at the parent plants. In the mutation process, if special conditions were achieved, the standard deviation would be re-initialized. This proposed method tries to achieve an optimal array pattern by acting on the relative amplitude excitation of each element in the linear array for an optimal inter-element spacing. The optimal array pattern has deep or broad nulls in some directions of interferences with low sidelobes level. The objective of the synthesis is to get amplitude excitations with low dynamic range ratio (DRR), which facilitates the design of beamforming feed network. To illustrate the robustness of the proposed method, numerical examples are presented and compared with the obtained results using bees algorithm (BA), bacterial foraging algorithm (BFA), real genetic algorithm (RGA), and the corresponding reference array pattern for each example.

Citation

ELhadi KENANE , Haddi BAKHTI , Haddi BAKHTI , Farid Djahli, , (2021), A Dynamic Invasive Weeds Optimization Applied to Null Control of Linear Antenna Arrays with Constrained DRR, Advanced Electromagnetics, Vol:10, Issue:1, pages:52-60, Advanced Electromagnetics

The main objective of this paper is to study the dielectric behavior of a ternary composite, made from a mixture of barium titanate (BT), copper oxide (CuO) in the same epoxy resin matrix (RE) maintained at 70% by volume fraction, while those of the other constituents are variable and completing each other in a way to achieve the remaining proportion, i.e. 30%. Random mixtures are made at room temperature and under atmospheric pressure. A dielectric characterization of this mixture type was performed by time-domain spectroscopy (TDS) over a frequency wide band (DC–3GHz). This has been carried out to illustrate the effect of copper oxide (CuO) simultaneously at low frequency (500MHz), in the presence of (BaTiO3), on the composite dielectric behavior. This has led consequently to make a comparison between the present acquired results and those of the ternary composite, where (CuO) act separately. The results obtained so far confirm the AC conductivity frequencies dependence, and fit the Jonscher’s law. In addition, It has been reported an increase of this conductivity σ_ACwhile the frequency goes up. However, the Static conductivity is affected clearly by the presence of CuO particles amount and these results show σ_(DC )plateau in the low frequency range. In fact, these characteristics are useful in many pragmatic engineering areas like microelectronics and telecommunications components manufacturing.

Citation

Haddi BAKHTI , ,(2020), The influence of CuO on the dielectric properties of BaTiO3-Epoxy resin composites,CNTEA1-2020,M'sila,Algeria

This work deals with the preparation and characterization of pure and Nickel-doped porous Tin oxide (SnO2) thin films, using Spray pyrolysis technique for an eventual application in optoelectronics. The structural, morphological, optical, and electrical properties of these prepared samples were investigated using various techniques. X-ray diffraction analysis confirmed the tetragonal structure of pure SnO2 and Ni-doped films. The preferred orientation of the crystallites changed from (110) to (200) with the film doped at 15.3 at.% Ni, with crystallite size of about 10 and 18 nm for 15.3 at.% Ni-doped and 5.6 at.% Ni-doped SnO2, respectively. Scanning Electron Microscopy shows that the 15.3 at.% Ni-doped SnO2 film surface is relatively homogeneous, while the 5.6 at.% Ni-doped film is highly porous. The measured contact angles are less than 90° for all the prepared samples confirming the hydrophilic character of all the films. Transmittance as high as 85% in the visible region was observed for 5.6 at.% Ni-doped films, while lower transmittance is observed for 15.3 at.% Ni-doped films. A decrease of the optical band gap and the resistivity with increasing Ni dopant concentration were also observed.

Citation

Noubeil GUERMAT , Haddi BAKHTI , Mehdi Khalfallah, Warda Daranfed, , (2020), Hydrophilic nickel doped porous SnO2 thin films prepared by spray pyrolysis, Physica Scripta, Vol:95, Issue:9, pages:095805, IOPSCIENCE

A lot of progress in computing systems components are devoted today to grant more support for parallelism. This, is likely affording much opportunities for High Performance Computing (HPC) applications developers who become now able to accelerate run-times progressively. Adapting algorithmic writings for parallelism paradigm likely leads to additional improvement in run-times. This paper deals with this matter. We carry an empirical measures to assess how interesting is to re-adapt algorithmic thinking for parallel processing context. We provide thorough comparisons of achievable accelerations among a number of different sorting algorithm kinds. We use a proprietary framework meant previously to serve as a front-end kernel in an automatic parallelization compiler and we populated it with interpolation to make performance predictions in large-scale parallelization. Sequential, semi parallel and parallel algorithms for sorting problem are all involved in the empiric tests considering different distributions for randomized input records. The results let to estimate how much the innovation of specific parallel algorithms could be more profitable than parallelization of serial programs.

Citation

Haddi BAKHTI , ,(2019), Would it be Profitable Enough to Re-adapt Algorithmic Thinking for Parallelism Paradigm,2019 2nd International Conference on new Trends in Computing Sciences (ICTCS),Amman, Jordan, Jordan

En este trabajo, investigamos y modelamos el comportamiento dieléctrico de un compuesto ternario preparado a temperatura ambiente, con una mezcla de resina epoxi (RE), titanato de bario (BaTiO3) y óxido de cobre (Cu2O) a varias proporciones y posteriormente sinterizado a tres temperaturas diferentes (150 °C, 200 °C y 250 °C) con el fin de determinar el efecto de la temperatura desinterizado sobre estos medios. La caracterización experimental de las muestras, en el rango DC- 6GHz, se realiza por reflectometría en el dominio de tiempo (TDR) utilizando el protocolo de múltiples reflexiones. Los compuestos sinterizados muestran una buena estabilidad dieléctrica con respecto a la frecuencia y una fuerte dependencia con la concentración de BaTiO3. Un proceso de relajación dieléctrica tiene lugar a baja frecuencia atribuible principalmente a la resina. Para describir y predecir el comportamiento dieléctrico de estos medios materiales en función de la concentración de cada una de los diferentes componentes, así como con la temperatura de sinterizado se utiliza finalmente un modelo modificado de Lichtenecker.

Citation

Haddi BAKHTI , ,(2019), Comportamiento dieléctrico de un compuesto ternario sinterizado, Resina-epoxi/BaTiO3/Cu2O, en la banda 0-6 GHz,,XXXVIIth Biennial Meeting of the Spanish Royal Society of Physics (RSEF),Zaragoza espana

Water is a vital resource for life as well as for the majority of energy industries. Finding a way to manage this water sustainably is essential at a time when the world’s water resources are already under increasing stress due to population growth and global warming. As a direct implication, saving water is coming very crucial. This work deals with the application of the empirical mode decomposition method to the detection and the localization of the leaks using acoustic signals issued from STM32F4 acquisition card. Firstly, the empirical mode decomposition method has been applied in the denoising of acquired signals leading to two estimated components on which we apply secondly the correlation method to detect and localize the leakage in water distribution network. Experimental obtained results using a developed hydraulic plant as well as the acquisition system confirm the efficiency of the proposed method to detect accurately the leaks compared to conventional leaks detection methods.

Citation

Haddi BAKHTI , , (2019), Experimental Validation of Hybrid EMD-Correlation Acoustic Digital Leaks Detector in Water Distribution Network System, I2M, Vol:18, Issue:6, pages:535-545, IIETA

The battery charging control within wind turbine applications is the most important challenge in standalone exploitation mode because of the random nature of wind energy and irregular use of electricity. Within this problematic, this paper deals with monitoring and control of a permanent magnet synchronous generator voltage for battery charging. In the proposed topology, the output direct drive PMSG is linked to the battery through a vector-controlled pulse modulated (PWM) rectifier. Most wind energy conversion systems are based on precise knowledge of the wind speed, which makes the adjustment of the charge voltage relatively complicated, and degrades the powers captured with erroneous measurements of this wind speed. In this context, all the efforts of this work are meant to simplify and improve the dynamic performance of the system. The technique used in this work is devoid of wind measurement. By neglecting different losses, the approach adopted leads us to the reference electromagnetic torque, assuming that the wind speed and consequently the rotational speed of the turbine vary slowly in steady state. Using the load current and voltage measures, the proposed controllers calculate permanently the power reference that corresponds to the fixed battery voltage. A vector control approach is adopted to achieve decoupled power control on the supply side power converter by generating the direct and quadrature control voltages. These voltages are necessary to generate the corresponding duty cycles of the PWM active switching devices. Hence, the PWM rectifier maintains the battery voltage at a fixed value by balancing both the rectifier output current and the load input current. To activate the vector control, two dynamic controllers are designed, simulated, and compared. The first controller is based on simple PI regulators. Meanwhile, the second one, which is a sliding mode technique, is applied to control the battery voltage. In order to assess the effectiveness of the used techniques, simulation models have been subjected to critical conditions of changing in speed and load. Simulation results revealed a poor accuracy of the first technique during transients and its close correlation under load disturbance. Whereas the sliding mode controller has high precision and strong robustness in steady state and during transient phases. The system simulation is performed using MATLAB/SIMULINK.

Citation

Haddi BAKHTI , , (2019), Monitoring and control of a permanent magnet synchronous generator-based wind turbine applied to battery charging, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, Vol:2019, Issue:1, pages:535-545, francis and taylor

Water is a vital resource for life as well as for the majority of energy industries. Finding a way to manage this water sustainably is essential at a time when the world’s water resources are already under increasing stress due to population growth and global warming. As a direct implication, saving water is coming very crucial. This work deals with the application of the empirical mode decomposition method to the detection and the localization of the leaks using acoustic signals issued from STM32F4 acquisition card. Firstly, the empirical mode decomposition method has been applied in the denoising of acquired signals leading to two estimated components on which we apply secondly the correlation method to detect and localize the leakage in water distribution network. Experimental obtained results using a developed hydraulic plant as well as the acquisition system confirm the efficiency of the proposed method to detect accurately the leaks compared to conventional leaks detection methods.

Citation

Haddi BAKHTI , Miloud BENTOUMI , ELhadi KENANE , Abdelghani Harrrag, , (2019), Experimental Validation of Hybrid EMD-Correlation Acoustic Digital Leaks Detector in Water Distribution Network System, Instrumentation Mesure Métrologie, Vol:18, Issue:6, pages:535-545, IIETA

This paper describes control system design of a small size vertical axis wind turbine for battery charging, using permanent magnet synchronous generator (PMSG). The direct drive PMSG is connected to the battery through a switch mode rectifier where a DC-DC buck converter is used to optimize the wind power. The use of speed sensor to the control system design complicates and adds more costs to the system. To resolve this problem, a sensorless maximum powertracking algorithm is proposed to calculate the current command that corresponds to maximum power output of the turbine. The DC-DC converter uses this current command to calculate the duty cycle which is necessary to control the pulse width modulated (PWM) active switching device. The system overview and modeling is presented, including characteristics of wind turbine, generator, batteries, power converter, control system, and supervisory system. A simulation of the system is performed using MATLAB/SIMULINK.

Citation

Haddi BAKHTI , , (2018), Sensorless control system design of a small size vertical axis wind turbine, Jordan Journal of Mechanical and Industrial Engineering, Vol:12, Issue:2, pages:93 - 98, Jordanian Ministry of Higher Education and Scientific Research in corporation with the Hashemite University

This paper describes the design of an automatic parallelization framework. The kernel supplied at its front end was suggested as an instrument for parallel potential assessment. It was used to measure the maximum achievable speedups in the major set of the CHStone benchmark suite programs. In such framework, we suggested the liberation of parallelism incrementally. We proposed a data dependency heuristic-based transformation method to make true dependences dissociation. We generated an internal representation (IR2), where the Banerjee test conditions are met. Two among three of Banerjee test conditions came to be committed. In shared memory many/multicore platforms, the third condition could be satisfied by privatization. We would be able to choose the safe and the opportune pairwise (mapping-privatization) scheme among a number of threads mapping scenarios that become available in the IR2 structure. Instrumentation on a subset of CHStone benchmark was carried out as a validity proof of our proposal, and the results confirmed that our framework kernel is robust.

Citation

Haddi BAKHTI , , (2018), Incremental Banerjee test conditions committing for robust parallelization framework, Turkish Journal of Electrical Engineering & Computer Sciences, Vol:26, Issue:5, pages:2595-2604, TÜBİTAK

The main goal of the present paper is the study of transmitted power control (TPC) algorithms for mobile cellular systems (UMTS). A novel power control algorithm and some already existing ones have been studied focusing on resolving the near-far problem that affects the performance of the system a whole. Unlike the other existing power control algorithms, and besides the dynamic step size, our Modified Adaptive Power Control algorithm (MAPC) shows its uniqueness in the intelligence added to restrict the oscillations of the estimated signal to interference ratio (SIR) around its target value by using a stabilization zone. Simulations were carried out to evaluate the robustness of the novel algorithm. The results show that the proposed algorithm outperforms the other existing power control algorithms.

Citation

Haddi BAKHTI , ,(2018), An Adaptive Power Control Algorithm For 3G Cellular Networks,2018 International Conference on Communications and Electrical Engineering (ICCEE),El Oued, Algeria, Algeria

The main goal of the present paper is the study of transmitted power control (TPC) algorithms for mobile cellular systems (UMTS). A novel power control algorithm and some already existing ones have been studied focusing on resolving the near-far problem that affects the performance of the system a whole. Unlike the other existing power control algorithms, and besides the dynamic step size, our Modified Adaptive Power Control algorithm (MAPC) shows its uniqueness in the intelligence added to restrict the oscillations of the estimated signal to interference ratio (SIR) around its target value by using a stabilization zone. Simulations were carried out to evaluate the robustness of the novel algorithm. The results show that the proposed algorithm outperforms the other existing power control algorithms.

Citation

ELhadi KENANE , Haddi BAKHTI , Miloud BENTOUMI , Fegriche Fatima zahra, Farid Djahli, ,(2018), An Adaptive Power Control Algorithm For 3G Cellular Networks,International Conference on Communications and Electrical Engineering,El Oued, Algeria

In this study, the authors propose and analyse a novel leak-detection method based on the ‘Haar’ continuous wavelet transform (CWT) and a double thresholding, i.e. CWTDT. Inspired by the idea of the binary integration technique in radar target detection, the algorithm analyses the non-stationary vibration signal issued from a water pipeline through which it decides whether or not there exists a leak in the water conveyance. To achieve this, the signal is first divided into several segments. Partial binary decisions within each segment are then obtained through the use of two preselected thresholds. The final binary decision is obtained by means of the ‘K out of L’ fusion rule. In doing this, the hardware leak system prototype is designed and a number of desirable leak positions in the water pipeline are first created to achieve the two best thresholds and ‘K out of L’ fusion rule. For comparison purposes, the performances of the proposed CWTDT method are assessed experimentally against those of the existing fast Fourier transform- and CWT-based methods under real operating conditions.

Citation

Haddi BAKHTI , , (2017), Wavelet DT method for water leak-detection using a vibration sensor: an experimental analysis, IET Signal Processing, Vol:11, Issue:4, pages:396 – 405, IET

In this paper, we investigate and model the dielectric behavior of a ternary composite prepared at room temperature with a mixture of epoxy resin (RE), barium titanate (BT) and copper oxide (Cu2O), sintered at three different temperatures (150 °C, 200 °C, and 250 °C). Time domain spectroscopy (TDS) is used to characterize samples in the range [DC to 2 GHz] by performing a particular study at low frequency (500 MHz). The latter focused on both the sintering and the Cu2O addition effects on a ternary composite dielectric behavior. These effects were quantified as a function of the BT volume fraction. For this purpose, we used an optimization method based on nonlinear regressions to determine the permittivity, to minimize systematic errors of this dielectric parameter, and to show the effect of Cu2O on it. Moreover, we attempt to explain the sintering temperature effect on this kind of mixtures through the modified Lichtenecker model. As a matter of fact, the importance of this law is allocated on one hand to the validation and concordance of the experimental results with those of the theory and on the other hand to the temperature effect investigation on the form factor given by the modified Lichtenecker law.

Citation

Haddi BAKHTI , , (2017), Dielectric behavior of a sintered heterogeneous ternary composite resin/BT/Cu2O, The European Physical Journal Applied Physics, Vol:80, Issue:2, pages:20202-1-9, EDP Sciences

In the development of dielectric composite,it is interesting to know the structure-property relationship at nanoscale level and the effect of each phase in the global properties of the material. In this context, we present an experimental analysisin the case of a ternary composite material. Several homogeneous microstructures samples with copper (II) oxide (CuO) and barium titanate (BaTiO 3) particles in powder form with various amounts dispersed in a host matrix of Epoxy Resin are prepared. Their dielectric permittivity spectra are measured using time domain Reflectometry (TDR) technique.Theexperimental data isanalyzed by means of electric modulus formalisms.In high frequency, the electrical modulus confirms the presence of two relaxations process.The real part of such composite presents a stability before the frequency where the relaxation phenomena appeared.The addition of the CuO does not affect the real part of permittivity significantly, but its effect is clear in the imaginary part and hence the AC conductivity.The conductivity indicates that the conduction is ionic and due to the ion of CuO primarily. According to results obtained from this study, we can made composite materials with desired characteristics using these two phases in the limits of their dielectric intrinsic permittivity.The manufacturing process of such composite is simple andcan be used in manufacture.In addition, the reproducibility of such composite ischecked in this study.

Citation

Haddi BAKHTI , ,(2015), Study of the effect of the CuO inthe dielectric properties of the nanocomposites Epoxy resin /BaTiO 3,4 th International Conference on Electrical Engineering (ICEE 2015),Boumerdès, Algeria

In this work, we present an experimental study on a novel ternary composite material. In this case, several samples with barium titanate (BaTiO3) and copper oxide (Cu2O) particles in powder form in various amounts dispersed in a host matrix of epoxy resin (Re/BT/Cu2O) are carried out and sintered at 150°C. Their dielectric constants spectra were measured in the frequency range DC–3GHz by time domain spectroscopy (TDS). Low frequency has also been performed throughout this work, and it has primarily concentrated on conductivity behaviour which may be attributed to the effects of a percolation process. Experimental data were analyzed by means of dielectric permittivity and electric modulus formalisms. The functionality of the composite systems is related to the abrupt variation of the real part of permittivity, and to the relaxation process of the Cu2O particles. In addition, the behaviour obtained experimentally has been validated by the random mixture law of Lichtenecker in order to predict the electromagnetic behaviour of such composite material.

Citation

Haddi BAKHTI , ,(2014), EXPERIMENTAL STUDY OF DIELECTRIC AND FUNCTIONAL PROPERTIES OF POLYMER MATRIX/Cu2O/BaTiO3 HETEROGENEOUS COMPOSITES IN BROAD BAND FREQUENCY,14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings,,bulgaria

Leak detection of water distribution networks is a problem that arouses theresponsibleauthorities for distribution all around the word. The reason, which involved researchers representing various disciplines to try to find a solution to the problem by implementing efficient devices in this field.Distributions networks are being degraded over time, which can cause leakage.To detect a leakequipment and techniquesare needed. They are constant progress with the development of technology. In this paper, the CWT (continuous wavelet transform) wassuggested as a technique for detecting and locating leaks in water distribution networks. The treatment using the CWT technique was foundas thebest solution for confirmation of the presence of a leakafter trying different signal analysis tools such as transforms (FFT, STFT, etc ....). The application was carried out in the laboratory with a short channel hybrid prototype (a part of steel followed by a part in PVC). Validations tests have shown the effectiveness of the method.

Citation

Haddi BAKHTI , ,(2014), A WAVELET APPROACH FOR DETECTION AND LOCATION OF LEAKS IN WATER DISTRIBUTION NETWORKS,14th International Multidisciplinary Scientific GeoConference SGEM 2014,,bulgaria