Erritali M.,Sultan Moulay Slimane University
Indonesian Journal of Electrical Engineering and Computer Science | Year: 2016
The growth in the volume of text data such as books and articles in libraries for centuries has imposed to establish effective mechanisms to locate them. Early techniques such as abstraction, indexing and the use of classification categories have marked the birth of a new field of research called “Information Retrieval”. Information Retrieval (IR) can be defined as the task of defining models and systems whose purpose is to facilitate access to a set of documents in electronic form (corpus) to allow a user to find the relevant ones for him, that is to say, the contents which matches with the information needs of the user. Most of the models of information retrieval use a specific data structure to index a corpus which is called “inverted file” or “reverse index”. This inverted file collects information on all terms over the corpus documents specifying the identifiers of documents that contain the term in question, the frequency of each term in the documents of the corpus, the positions of the occurrences of the word. In this paper we use an oriented object database (db4o) instead of the inverted file, that is to say, instead to search a term in the inverted file, we will search it in the db4o database. The purpose of this work is to make a comparative study to see if the oriented object databases may be competing for the inverse index in terms of access speed and resource consumption using a large volume of data. © 2016 Institute of Advanced Engineering and Science. All rights reserved.
Hamadi F.,Sultan Moulay Slimane University
Mikrobiologiia | Year: 2011
A simple and rapid method, Microbial adhesion to hexadecane, for estimating the cell surface charge is proposed. This method is based on the determination of cell affinity to hexadecane at low ionic strength and at high ionic strength. The difference between these two affinities can provide the relative cell surface charge. The application of this method for Staphylococcus aureus and Escherichia coli show that the profile of surface charge evolution as a function ofpH was similar to these obtained by microelectrophoresis method.
Mouayn Z.,Sultan Moulay Slimane University
Journal of Physics A: Mathematical and Theoretical | Year: 2010
A class of generalized coherent states with a new type of the identity resolution is constructed by replacing the labeling parameter z n/√n! of the canonical coherent states by Meixner-Pollaczek polynomials with specific parameters. The constructed coherent states belong to the state Hilbert space of the Gol'dman-Krivchenkov Hamiltonian. © 2010 IOP Publishing Ltd.
Mouayn Z.,Sultan Moulay Slimane University
Journal of Mathematical Physics | Year: 2012
We construct a class of generalized phase coherent states |e iθ γ, α, ε >, indexed by points e iθ of the unit circle and depending on three positive parameters γ, α, and ε, by replacing the labeling coefficient Z n/√n! of the canonical coherent states by circular Jacobi polynomials g n γ with parameter γ ≥ 0. The special case of γ = 0 corresponds to the well-known phase coherent states. The constructed states are superposition of eigenstates of a one-parameter pseudoharmonic oscillator depending on α and constitute a resolution of the identity of the state Hilbert space at the limit ε → 0 +. Closed form for their wavefunctions are obtained in the case α = γ + 1 and their associated coherent states transforms are defined. © 2012 American Institute of Physics.
Malaoui A.,Sultan Moulay Slimane University
Proceedings of the International Conference on Microelectronics, ICM | Year: 2016
In this paper, an electronic temperature control system is presented. This contribution aims to provide a not expensive prototype, fast and accurate, which can be used by research laboratories to control the temperature for electrical measurements. This device is based on the implementation of the PID algorithm in an embedded system at 10-bit Analog/Digital Converter (ADC). The electronic schematics and results of this controller are presented and compared with those with an old 8-bits ADC controller and with a standard laboratory regulator. Initial tests are performed on the temperature control of a photovoltaic junction to measure its intrinsic electrical parameters. The obtained results show the range and levels of the advantages of this device. © 2015 IEEE.
Moubarik A.,Sultan Moulay Slimane University
Journal of Adhesion | Year: 2015
The rheological properties of sugar cane bagasse lignin-phenol formaldehyde (PF) (30% lignin-PF) resins were studied using oscillation tests. The bagasse lignin was introduced in the classic adhesive formulation in order to supply a part of PF. Rheological qualities of optimal lignin-PF (30% lignin-PF) resins and commercial PF resin were assessed by using a rotary rheometer (ARES). Dynamic rheological measurements, performed at low strain in the linear range, are useful to characterize the network properties of resins. The results obtained showed that the time sweep indicates excellent structural stability of optimal lignin-PF (30% lignin-PF) resins and commercial PF resin. The elastic modulus is greater than the viscous one showing a remarkable elastic character of the resins, and the performed frequency sweeps show a typical spectrum of a "weak gels" structure. The time dependence at 125°C shows that the optimum cure time is 7.5 min. © 2015 Taylor and Francis Group, LLC.
Aitalioubrahim M.,Sultan Moulay Slimane University
Journal of Dynamical and Control Systems | Year: 2016
We give sufficient conditions to assure the existence of viable solutions for second-order functional differential inclusions in separable Banach spaces. We consider the case when the constraint is moving. © 2016 Springer Science+Business Media New York
El Gharras H.,Sultan Moulay Slimane University
Natural Product Communications | Year: 2011
We have analyzed the stability of betalains in juices prepared from Moroccan yellow cactus pears (Opuntia ficus indica (L.) Mill.) as a function of temperature and pH. The experiments were carried out at temperatures ranging from 80 to 100°C with juices at pH 3.5, 5 and 6.5. The degree of pigment retention decreased when the temperature increased. The degradation constant rates were determined for thermal degradation rates of pseudo-first order. The Arrhenius plot obtained for the degradation of betaxanthin from the yellow fruits was not linear. Regardless of the temperature of treatment, the lowest degradation was obtained for pH 5. When some stabilizers were tested for the protection of pigments, the results showed that ascorbic acid was a better protective agent at pH 3.5, increasing the protection by 40%. The inhibitive action of betalain pigments extracted from cactus pears towards corrosion of stainless steel in phosphoric acid was investigated using electrochemical polarization and electrochemical impedance spectroscopy (EIS) methods. It was found that the presence of natural pigments reduces the corrosion rate of the tested metal, especially on addition of the red pigments (97%). The inhibition efficiency increases as the pigment concentration of extracts increases. It was also found that the pigments tested act as mixed inhibitors. The inhibitive action of the extracts is discussed in term of adsorption and that such adsorption follows a Langmuir adsorption isotherm. The calculated values of the free energy of adsorption indicated that the adsorption process is spontaneous.
Malaoui A.,Sultan Moulay Slimane University
Proceedings of IEEE/ACS International Conference on Computer Systems and Applications, AICCSA | Year: 2016
This paper discusses design and implementation of an operational architecture of practical work remote controlled using embedded systems. This architecture relates to university courses in electronics, such as new approaches of low-cost remote labs. Students can access these labs from a local network in the university at any time and frequently compared to conventional teaching, without being fixed by the conventional schedule. This strategy can solve the problems related to the big number of registrants in Moroccan Faculties, particularly in open access institutions. The hardware and software parts of this prototype are presented and analyzed because they can be generalized in other disciplines. The hardware part is formed with a Arduino microcontroller, which controls an electronic manipulation of a single-phase rectifier, considered as example of a remote controlled manipulation. The evaluation of this educational system is performed by students in the discipline of electronics and industrial systems, which shows the benefits of this realization. © 2015 IEEE.
Barakat A.,Sultan Moulay Slimane University
Arabian Journal of Geosciences | Year: 2015
The Ourika gold showing lies in the High Atlas of Morocco, near Marrakech. It is mainly hosted by Precambrian gneiss and basic dykes, and is controlled by shear zones. Gold mineralization occurs mainly within quartz structures. Fracturing and mineralization are interpreted to have occurred in three stages. Early and intermediate stages involved the deposition of an arsenopyrite–pyrite–quartz–chlorite assemblage, and a chalcopyrite–arsenopyrite–pyrite–quartz–chlorite assemblage, respectively. Early intermediate stage fluid inclusions belong to the C-H-O-N system typical of the retrograde metamorphism that affects the Pan-African terranes at P-T conditions of 140–300 MPa and 240–450 °C, and moderate ductile–brittle deformation. Deposition of native gold, bismuth, bismuthinite and galena during the ore stage from low-salinity aqueous fluids was related to downward penetration of meteoric waters, trapped at P-T conditions of 20–110 MPa and 170–210 °C. Evolving physical conditions and fluid compositions from early to late fluid stages played important roles in ore-forming processes. Owing to structural observations, ore-forming fluids could be linked to regional Variscan hydrothermal event. Gold crystallised as native particles in microfissures crosscutting earlier sulphides. Thus, the gold deposition was late, and appears as a consequence of deeply penetration of oxidising fluids favoured by microfracturing of the already ore (As–Fe–Cu) structures. © 2014, Saudi Society for Geosciences.