130 research outputs found
Le capital immatĂ©riel et lâattractivitĂ© des investissements direct Ă©trangers : relation tumultueuse- modĂ©lisation Ă©conomĂ©trique- « Cas du secteur industriel Marocain
Lâobjectif de cet article est dâĂ©tudier la relation dâimpact entre le capital immatĂ©riel et lâattractivitĂ© des IDE sur le plan thĂ©orique et empirique. Au niveau du sous-bassement thĂ©orique, nous analyserons les mĂ©canismes par lesquels le capital immatĂ©riel peut stimuler un transfert des processus de production dâun pays vers un autre. Sur le plan empirique, nous vĂ©rifierons cette relation, dans le cas du secteur industriel au Maroc, via une modĂ©lisation Ă©conomĂ©trique en utilisant le modĂšle de rĂ©gression linĂ©aire multiple. Cet article rĂ©pond Ă la problĂ©matique suivante : Dans quelle mesure lâinvestissement en capital immatĂ©riel peut-il ĂȘtre une source dâattractivitĂ© des investissements directs Ă©trangers au Maroc ?Lâobjectif de cet article est dâĂ©tudier la relation dâimpact entre le capital immatĂ©riel et lâattractivitĂ© des IDE sur le plan thĂ©orique et empirique. Au niveau du sous-bassement thĂ©orique, nous analyserons les mĂ©canismes par lesquels le capital immatĂ©riel peut stimuler un transfert des processus de production dâun pays vers un autre. Sur le plan empirique, nous vĂ©rifierons cette relation, dans le cas du secteur industriel au Maroc, via une modĂ©lisation Ă©conomĂ©trique en utilisant le modĂšle de rĂ©gression linĂ©aire multiple. Cet article rĂ©pond Ă la problĂ©matique suivante : Dans quelle mesure lâinvestissement en capital immatĂ©riel peut-il ĂȘtre une source dâattractivitĂ© des investissements directs Ă©trangers au Maroc
Identification of the xenometabolome and novel contaminant markers in fish exposed to a wastewater treatment works effluent
Fish can bioconcentrate complex mixtures of xenobiotics arising from exposure
to wastewater effluents discharged into surface waters. Wastewaters contain a complex
mixture of organic compounds and little is known about their uptake into fish and their
health effects. In this study, a chemical profiling approach was used to characterize the
profile of xenobiotics and their metabolites (the xenometabolome) in biofluids (bile and
plasma) of juvenile rainbow trout (Oncorhynchus mykiss) exposed to a wastewater
effluent. Metabolite profiles of effluent-exposed fish were compared with that from
control fish exposed to uncontaminated river water. Samples were analysed by ultra
performance liquid chromatography-time-of-flight mass spectrometry and data analysed
by multivariate statistics. Exposure to effluent resulted in accumulation in trout bile of
alkylsulfophenyl and alkylpolyethoxy carboxylates, as well as glucuronide conjugates
of nonylphenol ethoxylates, alcohol ethoxylates, naphthols, chlorinated xylenols and
phenoxyphenols, chlorophenes, resin acids, mefenamic acid and oxybenzone. Nonconjugated or sulphate conjugates of many of these contaminants were also detected in plasma of effluent-exposed trout. In addition, changes in the concentrations of endogenously derived metabolites were also detected in trout plasma, and these included an increase in blood bile acids, methylbutryolcarnitine and a decrease in
sphingosine levels. These observations were verified in a further exposure of sexually mature roach (Rutilus rutilus) to concentrations of the same effluent. Exposure to 50%
or 100% effluent resulted in dose dependent increases in blood concentrations of xenobiotics, taurocholic acid, syprinol sulphate and lysophospholipids and decreases in
sphingosine levels. This work reveals the complex nature of xenobiotics accumulating in effluent-exposed fish together with the identification of changes in concentrations of
lipid metabolites associated with hepatotoxicity. These results reveal, for the first time, that metabolite profiling techniques can be used to screen for uptake of complex mixtures of contaminants into fish and also for the detection of natural metabolite pathways in the organism that are disrupted due to exposure to multiple xenobiotics
Lâinvestissement en capital immateÌriel, levier pour la preÌdiction de lâeÌvolution de la balance commerciale au Maroc : modeÌlisation eÌconomeÌtrique -cas des importations-
Suite au deÌplacement des forces motrices de lâeÌconomie et, depuis que lâeÌconomie de lâimmateÌrielle est theÌoriseÌe, il est admis que la production eÌtait contingente des moyens aÌ mettre en Ćuvre pour la reÌaliser. Lâinvestissement en capital immateÌriel releÌve dâabord dâun choix des deÌcideurs eÌconomiques du secteur public. Ces deÌcideurs peuvent intervenir sur le marcheÌ pour piloter et orienter lâinvestissement immateÌriel afin dâagir positivement sur le niveau de la balance commerciale.
Lâobjectif de notre contribution est de veÌrifier la relation entre le capital immateÌriel et sa capaciteÌ aÌ preÌdire lâeÌvolution de la balance commerciale au Maroc tout en prenant en compte les importations dans le cas empirique. En premier lieu, nous mobiliserons les theÌories les plus pertinente dâune part et, dâautre part, nous reÌaliserons une modeÌlisation eÌconomeÌtrique, via le modeÌle de reÌgression lineÌaire multiple, appliqueÌe dans le cas du Maroc. Les reÌsultats de notre article indiquent que lâinvestissement en capital immateÌriel peut preÌdire lâeÌvolution des importations via les effets de synergie. Nous avons deÌtermineÌ les indicateurs qui permettraient dâimpacter les importations
OPTIMISATION MULTIOBJECTIF APPLIQUEE A UN RESEAU ALGERIEN DE TRANSPORT DâELECTRICITE CONTENANT UNE SOURCE EOLIENNE
LâoriginalitĂ© de ce travail consiste Ă introduire une nouvelle contrainte correspondante aux exigences de la stabilitĂ© transitoire du rĂ©seau Ă©lectrique aprĂšs intĂ©gration des sources Ă©oliennes et ce dans la formulation du problĂšme dâoptimisation des pertes de puissance et lâĂ©mission des gaz toxiques dĂ©gagĂ©s Ă partir des centrales Ă©lectriques alimentant ce rĂ©seau. Pour ce faire, un code de calcul basĂ© sur les algorithmes gĂ©nĂ©tiques a Ă©tĂ© Ă©laborĂ© en introduisant une matrice contenant les diffĂ©rents pourcentages de puissances de la source Ă©olienne avec leurs taux limites de pĂ©nĂ©tration considĂ©rĂ©s comme une contrainte dâinĂ©galitĂ© supplĂ©mentaire dite contrainte de stabilitĂ© transitoire. Le rĂ©seau algĂ©rien de transport dâĂ©lectricitĂ© est choisi comme un rĂ©seau test pour vĂ©rifier les performances de cette mĂ©thode oĂč les rĂ©sultats des diffĂ©rentes simulations sont trĂšs satisfaisants. ModĂ©lisation
Dynamics of the polynomial differential systems with homogeneous nonlinearities and a star node
AgraĂŻments: The first and third author is partially supported by the Algerian Ministry of Higher Education and Scientific Research.We consider the class of polynomial differential equations Ëx = λx + Pn(x, y), yË = λy + Qn(x, y), in R2 where Pn(x, y) and Qn(x, y) are homogeneous polynomials of degree n > 1 and λ Ìž= 0, i.e. the class of polynomial differential systems with homogeneous nonlinearities with a star node at the origin. We prove that these systems are Darboux integrable. Moreover, for these systems we study the existence and non-existence of limit cycles surrounding the equilibrium point located at the origin
Estimation for Motion in Tracking and Detection Objects with Kalman Filter
The Kalman filter has long been regarded as the optimal solution to many applications in computer vision for example the tracking objects, prediction and correction tasks. Its use in the analysis of visual motion has been documented frequently, we can use in computer vision and open cv in different applications in reality for example robotics, military image and video, medical applications, security in public and privacy society, etc. In this paper, we investigate the implementation of a Matlab code for a Kalman Filter using three algorithm for tracking and detection objects in video sequences (block-matching (Motion Estimation) and Camshift Meanshift (localization, detection and tracking object)). The Kalman filter is presented in three steps: prediction, estimation (correction) and update. The first step is a prediction for the parameters of the tracking and detection objects. The second step is a correction and estimation of the prediction parameters. The important application in Kalman filter is the localization and tracking mono-objects and multi-objects are given in results. This works presents the extension of an integrated modeling and simulation tool for the tracking and detection objects in computer vision described at different models of algorithms in implementation systems
Surface-related properties of perovskite CH3NH3PbI3 thin films by aerosol-assisted chemical vapour deposition
A modified three-step aerosol-assisted chemical vapour deposition process was used to grow dense and uniform CH3NH3PbI3 thin films directly on borosilicate glass. The resulting photoluminescence spectrum was blue shifted with respect to its bandgap. X-ray photoelectron spectroscopy studies confirmed non-stoichiometric lead : iodine ratios within the films, due to decomposition of the CH3NH3PbI3 layers over time into lead iodide and the release of ammonia and hydrogen iodide. The complex refractive index and dielectric function of the deposited thin films were determined by variable angle spectroscopic ellipsometry
Experimental study of two-phase flow structure and pressure drop across a sudden contraction in horizontal pipe
Two-phase flow, particularly; gas-liquid flow is widely encountered in industrial applications like boilers, condensers, evaporators and reactors. These systems often exhibit complex geometry consisting on singularities such as expansions, contractions, orifices, bends etc. The presence of geometrical singularities in pipes may affect significantly the behavior of two-phase flow and subsequently the resulting pressure drop. Therefore, it is an important subject of investigation in particular when the application concerns design, safety and economical operations. This study investigates the pressure change and ïŹow pattern subject to the inïŹuence of a sudden contraction. The pressures through sudden contraction in horizontal circular pipes have been measured with a capacitive differential pressure transducer, using air and water as the working fluids. The pressure drop is determined by extrapolating the pressure profiles upstream and downstream of the contraction. The larger and smaller tube diameters are 40 mm and 30 mm, respectively, with an area contraction ratio >\u1d70e= 0.567 . The ranges of the gas and liquid superficial velocity were 0.54 to 5.5 m/s and 0.011 up to 0.24 m/s respectively. It is noted that the sudden change in cross-section have a signiïŹcant inïŹuence on the downstream phase distribution of the air-water ïŹow. In addition, close to the sudden contraction, a significant pressure drop occurs for single phase flow (water). While, for two-phase flow cases, a local pressure minimum was not detectable, the vena contracta phenomenon may not occur at all especially at low flow rates
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