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Mahraz A.O.,University of Ghardaia | Bouhalouan D.,University of Oran 1 | Adla A.,University of Oran 1
Procedia Computer Science | Year: 2016

Distributed environments that use decision making systems help decision makers in their tasks related to distributed decision making problem solving; it's called facilitating virtual decision making process. Several technologies have been developed to help actors to achieve the decision making process in traditional context (meeting room). However, such technologies still have their limitations in real-time communication and efficient collaboration when are used in distributed environments. This paper presents some existing technologies, frameworks and describes issues to automate a list of functions that can be used to facilitate the process of decision making in distributed environments. © 2016 Published by Elsevier B.V.


PubMed | CNRS Chemical Engineering Laboratory, University of Ghardaia, Laboratoire Of Biologie Des Systemes Microbiens Lbsm and Northumbria University
Type: Journal Article | Journal: Journal de mycologie medicale | Year: 2016

A new strain of actinobacteria, designated ACD1, was isolated from a Saharan soil sample in the Hoggar region (Algeria). Morphological study led to this strain being classified as a member of the Actinomadura genus. Phylogenetic analysis based on the 16S rRNA gene showed that the strain is closely related to Actinomadurasediminis DSM 45500(T) (98.5% sequence similarity). Furthermore, strain ACD1 presented a strong activity against mycotoxigenic and phytopathogenic fungi, including Aspergillus and Fusarium strains, and other pathogenic microorganisms. The kinetics of antimicrobial activity were investigated on ISP-2, Bennett and TSB media. Four solvents (n-hexane, dichloromethane, ethyl acetate and n-butanol) were used for the extraction of the produced antibiotic. The highest antimicrobial activity was obtained using the butanolic extract from the ISP-2 medium after seven days of fermentation culture. The active antibiotic was purified by reverse-phase HPLC using a C18 column. The UV-visible and mass spectra were determined. The minimum inhibitory concentrations (MIC) of this antibiotic were determined against pathogenic microorganisms.


Ganghoffer J.-F.,LEMTA ENSEM | Kabouya N.,University of Ghardaia | Mefti N.,Enitec
Journal of Biomechanics | Year: 2010

Models of the adhesion of a population of cells in a plane flow are developed, considering the dilute regime. Cells considered as rigid punctual entities are virtually injected at regular times within a plane channel limited by two fixed planes. The pressure profile is supposed to be triangular (constant gradient), in accordance with the assumptions of a Poiseuille flow. The cell adherence to the channel wall is governed by the balance of forces, accounting for gravity, non-specific physical interactions, such as electrostatic effects (repulsive) and Van der Waals forces (attractive), specific adhesive forces representing the ligand-receptor interactions, and friction between cells and the fluid in the vicinity of the endothelium wall. The spatial distribution of the adhesion molecules along the wall is supposed to be a random event, accounted for by a stochastic spatial variability of the dipolar moments of those molecules, according to a Gaussian process. Experimental trends reported for the rate of aggregation of L-selectin mediated leukocytes under shear flow are in qualitative accordance with the evolution versus time of adhering cells obtained by the present simulations. The effect of the maximal injection pressure on those kinetics is assessed. © 2009 Elsevier Ltd. All rights reserved.


Sadine S.E.,University of Ouargla | Sadine S.E.,University of Ghardaia | Bissati S.,University of Ouargla | Lourenco W.R.,French Natural History Museum
Comptes Rendus - Biologies | Year: 2016

Since the early 2000s, the genus Buthus Leach, 1815 (family Buthidae) has been the subject of an important number of studies. These concerned particularly the species belonging to the 'Buthus occitanus' complex. A number of populations previously considered as subspecies or varieties of B. occitanus Leach were raised to the rank of species, but also many new species have been described. Most of the species considered in these studies come from North Africa, in particular from Morocco, Mauritania, Chad, Sudan and Egypt, but only two new species were recorded from Algeria. At present, one more new species of Buthus is described from the Algerian Saharan Desert, raising the number of confirmed Buthus in Algeria to five. Since most Buthus species from North Africa, and in particular those from Algeria, inhabit more mesic environments than the Saharan Central compartment, the new species appears as the first true deserticolous species found in this country. © 2015 Academie des sciences.


Lourenco W.R.,French Natural History Museum | Sadine S.E.,University of Ouargla | Sadine S.E.,University of Ghardaia
Comptes Rendus - Biologies | Year: 2014

Taxonomic considerations are given for the genus Lissothus Vachon, 1948 (Scorpiones, Buthidae). Two species are currently known, Lissothus bernardi Vachon, 1948 from Libya and Lissothus occidentalis Vachon, 1950 from Mauritania. In this contribution, a new species, Lissothus chaambi sp. n., is described from the desert of Central Algeria. The new species is most closely related to L. bernardi. The geographical distribution of the genus is discussed. © 2014 Académie des sciences.


PubMed | CNRS Systematics, Biodiversity and Evolution Institute, University of Ouargla and University of Ghardaia
Type: Journal Article | Journal: Comptes rendus biologies | Year: 2016

Since the early 2000s, the genus Buthus Leach, 1815 (family Buthidae) has been the subject of an important number of studies. These concerned particularly the species belonging to the Buthus occitanus complex. A number of populations previously considered as subspecies or varieties of B. occitanus Leach were raised to the rank of species, but also many new species have been described. Most of the species considered in these studies come from North Africa, in particular from Morocco, Mauritania, Chad, Sudan and Egypt, but only two new species were recorded from Algeria. At present, one more new species of Buthus is described from the Algerian Saharan Desert, raising the number of confirmed Buthus in Algeria to five. Since most Buthus species from North Africa, and in particular those from Algeria, inhabit more mesic environments than the Saharan Central compartment, the new species appears as the first true deserticolous species found in this country.


Bouderba H.,University of Ghardaia | Beddiaf R.,University of Batna
Modern Physics Letters B | Year: 2014

In the present work, based on first-principles calculations, we show that it is possible to obtain a new high pressure polymorph of the CaSi2 compound with a Laves structure. It corresponds to the MgCu2-type (C15) which is one of the three most important Laves phases. We also show that the two other structures, MgNi2- and MgZn2-types are very competitive energetically and are possible candidates for finite temperature investigations. © 2014 World Scientific Publishing Company.


Oulad-Naoui S.,University of Ghardaia | Cherroun H.,University of Laghouat | Ziadi D.,CNRS Informatics Systems Laboratory
DATA 2015 - 4th International Conference on Data Management Technologies and Applications, Proceedings | Year: 2015

It is well-known that developing a unifying theory is one of the most important issues in Data Mining research. In the last two decades, a great deal has been devoted to the algorithmic aspects of the Frequent Itemset (FI) Mining problem. We are motivated by the need of formal modeling in the field. Thus, we introduce and analyze, in this theoretical study, a new model for the FI mining task. Indeed, we encode the itemsets as words over an ordered alphabet, and state this problem by a formal series over the counting semiring (ℕ,+,×,0,1), whose the range constitutes the itemsets and the coefficients their supports. This formalism offers many advantages in both fundamental and practical aspects: The introduction of a clear and unified theoretical framework through which we can express the main FI-approaches, the possibility of their generalization to mine other more complex objects, and their incrementalization and/or parallelization; in practice, we explain how this problem can be seen as that of word recognition by an automaton, allowing an efficient implementation in O(|Q|) space and O(|FL||Q||) time, where Q is the set of states of the automaton used for representing the data, and FL the set of prefixial maximal FI.


PubMed | DSMZ German Collection of Microorganisms and Cell Cultures, Mohammed V University, University of Ghardaia and Blida University
Type: Journal Article | Journal: International journal of systematic and evolutionary microbiology | Year: 2015

Two actinomycete strains, designated H225(T) and H137, were isolated from two soil samples collected from the arid region of Ahbas at Bni-Isguen (Mzab), located in the Algerian Sahara. Phylogenetic analyses based on 16S rRNA gene sequences indicated that the novel strains should be assigned to the genus Prauserella of the family Pseudonocardiaceae , and they were therefore subjected to a polyphasic taxonomic study. These two strains contained meso-diaminopimelic acid as the diagnostic diamino acid and arabinose and galactose as major whole-cell sugars. The diagnostic phospholipid was phosphatidylethanolamine. The predominant menaquinone was MK-9(H4), and the major fatty acid was iso-C16 : 0. DNA-DNA hybridization values between strain H225(T) and its closest phylogenetic neighbours, namely Prauserella flava DSM 45265(T), Prauserella alba DSM 44590(T), Prauserella aidingensis DSM 45266(T), Prauserella salsuginis DSM 45264(T) and Prauserella sediminis DSM 45267(T), were clearly below the 70% threshold used for species delineation. The genomic DNA G+C content of strains H225(T) and H137 was 70.4 mol%. On the basis of phenotypic and genotypic data, strains H225(T) and H137(T) are considered to represent a novel species of the genus Prauserella , for which the name Prauserella isguenensis sp. nov. is proposed. The type strain is H225(T) (=DSM 46664(T)= CECT 8577(T)).


Hamed B.,University of Ghardaia | Fatiha R.,University of Ghardaia
Transactions on Electrical and Electronic Materials | Year: 2015

Our work is based on the development of a numerical model to develop a methodology for predicting the aging and breakdown in insulation due to the dynamics of space charge packets. The model of bipolar charge transports is proposed to simulate space charge dynamic for high DC voltage in law-density polyethylene (LDPE), taking into account the trapping and detrapping of recombination phenomena, this model has been developed and experimentally validation. Theoretical formulation of the physical problem is based on the Poisson, the continuity and the transport equations as well as on the appropriate models for injection. Numerical results provide temporal and local distributions of the electric field, the space charge density for the different kinds of charges, conduction and displacement current densities, and the external current. © 2015 KIEEME. All rights reserved.

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