93 research outputs found
Agricultural and non-agricultural outputs and energy consumption in Tunisia: empirical evidences from cointegration and causality
No full textThis short paper investigates the cointegration and causality link between energy consumption and agricultural, non-agricultural outputs (manufacturing sector and services sector) and overall gross domestic product in Tunisia for 1971-2003 period. Empirical results suggest that there is only unidirectional causality running from agricultural and non-agricultural sectors to energy consumption as well as from overall GDP growth to energy consumption. This unidirectional causality signifies a less energy dependent economy and suggests that it is sectoral growth that drives the energy consumption in Tunisia and not vice versa. Empirical results suggest also that Tunisian agricultural sector growth does not depend on energy, and high consumption of energy do not implies more productivity in the short run for this sector.energy consumption, output growth, causality, cointegration, Tunisia, Resource /Energy Economics and Policy,
Intersection and minimax inequality with a generalized coercivity in h-spaces
No full textWe define a generalized coercivity type condition for correspondence defined on atopological vector space endowed with a generalized convex structure. An extension of the Fan’smatching theorem is obtained and used to prove results on coincidence, fixed point and minimaxinequality with a weakned compactness condition.Corresponding Author:
Dr. Souhail Chebbi, Associate Professor, Department of Mathematics, College of Sciences, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia. Email: [email protected]
Wind regime and development of star dune on Erg Chebbi (South Marocco)
No full textWydmy gwiaździste (wydmy piramidalne, demkhas, ghourds, rhourds, oghrouds) są najmniej rozpoznanymi formami akumulacji eolicznej. Ich występowanie wiąże się z obszarami charakteryzującymi się złożonym reżimem wiatru - o co najmniej trzech kierunkach wiatru wydmotwórczego. Wykorzystując przestrzenne modele 16 form wydmowych, wykonane na podstawie szczegółowych pomiarów terenowych, przeanalizowano kształt wydm ergu Chebbi. Położenie i przebieg ramion porównano z reżimem wiatru. Określono dominujące kierunki wiatru wydmotwórczego dla wydm gwiaździstych oraz wydm poprzecznych w różnych fazach rozwoju, od form inicjalnych do dojrzałych. Stwierdzono, że rozwój wydm gwiaździstych ergu Chebbi związany jest tylko z dwoma kierunkami wiatru wydmotwórczego: SW i NE. Uzyskane wyniki pozwalają wnioskować, że obszary, na których dominują dwa kierunki wiatru, stanowią potencjalne regiony tworzenia się wydm gwiaździstych.Star dunes (pyramid dunes, demkhas, ghourds, rhourds, oghrouds) are the least studied dune type. Their development is typically associated with multidirectional wind regime. The aim of the study was to analyze the star dunes shape and correlate it with wind regime. This was made on the basis of detailed field measurements conducted within the Erg Chebbi (S Morocco), which allow to create 3D models of 16 dune forms. The position and orientation of dune arms were compared with wind regime. This allow to determine the main wind directions, which influence the development of star and transverse dunes in this area. The analysis is made for dune in different stages, from initial to mature forms. The results show that development of star dune on Erg Chebbi is connected with two wind directions, SW and NE wind. This allows to conclude that the areas with two dominant wind directions (bimodal wind regime) are the potential regions of star dune development
Preliminary characterization of biosurfactant produced by a PAH-degrading Paenibacillus sp. under thermophilic conditions
No full textThe capacities of a biosurfactant producing and polycyclic aromatic hydrocarbon (PAH) utilizing bacterium, namely, strain 1C, isolated from an Algerian contaminated soil, were investigated. Strain 1C belonged to the Paenibacillus genus and was closely related to the specie Paenibacillus popilliae, with 16S rRNA gene sequence similarity of 98.4 %. It was able to produce biosurfactant using olive oil as substrate. The biosurfactant production was shown by surface tension (32.6 mN/m) after 24 h of incubation at 45 °C and 150 rpm. The biosurfactant(s) retained its properties during exposure to elevated temperatures (70 °C), relatively high salinity (20 % NaCl), and a wide range of pH values (2–10). The infrared spectroscopy (FTIR) revealed that its chemical structure belonged to lipopeptide class. The critical micelle concentration (CMC) of this biosurfactant was about 0.5 g/l with 29.4 mN/m. In addition, the surface active compound(s) produced by strain 1C enhanced PAH solubility and showed a significant antimicrobial activity against pathogens. In addition to its biosurfactant production, strain 1C was shown to be able to utilize PAHs as the sole carbon and energy sources. Strain 1C as hydrocarbonoclastic bacteria and its interesting surface active agent may be used for cleaning the environments polluted with polyaromatic hydrocarbons
CO2 emissions, energy consumption and economic growth in Tunisia
No full textThe aim of this country specific study is to understand long and short-run linkages between economic growth, energy consumption and CO2 emission using Tunisian data over the period 1971-2004. Statistical findings indicate that economic growth, energy consumption and CO2 emission are related in the long-run and provide some evidence of inefficient use of energy in Tunisia, since environmental pressure tends to rise faster than economic growth. In the short run, results support the argument that economic growth exerts a positive “causal” influence on energy consumption growth. In addition, results from impulse response do not confirm the hypothesis that an increase in pollution level induces economic expansion. Although Tunisia has no commitment to reduce Greenhouse Gas emissions, energy efficiency investments and emission reduction policies will not hurt economic activities and can be a feasible policy tool for Tunisia.CO2 emissions, Energy Consumption, Economic Growth, Tunisia, Resource /Energy Economics and Policy,
RATING AND OTHER FACTORS EXPLAINING THE CORPORATE CREDIT SPREAD: EMPIRICAL EVIDENCE FROM TUNISIAN BOND MARKET
No full textThis is an examination of the determinants of corporate bond credit spreads using both primary and secondary market spreads for Tunisian corporate bonds. The factors which I use as explanatory variables in our estimations can be divided into three categories: market variables, issue and issuer characteristics. To some extent, these three categories correspond to the different types of risk, namely interest rate risk, liquidity risk and credit risk. Using OLS regressions, our empirical results indicate that primary market spreads are sensible to issue characteristics such as rating. Also, spreads observed in secondary market are sensible to market variables namely Exchange Index and Slope, characteristics issuers and issues (Rating and Time to maturity). This is the first study to indicate that the explanatory power of factors depends of spreads modelled. Hence, corporate credit spreads are driven by both default and interest rate risk for the secondary market and only by default risk for the primary market.credit spread, interest rate risk, liquidity risk, rating
Crystal structure of methyl 1-(4-fluorobenzyl)-4-methoxy-5-oxopyrrolidine-3-carboxylate, C<sub>14</sub>H<sub>16</sub>FNO<sub>4</sub>
No full textAbstract
C14H16FNO4, monoclinic, P21/n (no. 14), a = 10.189(4) Å, b = 7.742(2) Å, c = 17.240(5) Å, β = 94.50(1)°, V = 1355.8(7) Å3, Z = 4, R
gt(F) = 0.0420, wR
ref(F
2) = 0.1183, T = 295 K.</jats:p
O169 The Tunisian gynecologist puts itself in “Basic Laparoscopic Skills” for a better patient forecast
No full text
L'œuvre de Jules Vallès (une écriture de combat)
No full textCette thèse consacrée à l œuvre de Jules Vallès a pour objectif d analyser le processus qui conduit un auteur à faire de l écriture un outil de résistance et de revendication, voire une arme. À cette fin, il faudra questionner la place de l écrivain dans les contextes littéraire et social de l époque : la dialectique du moi et du peuple, le tiraillement entre l individuel et le collectif Une première partie est consacrée aux débuts de Vallès dans la littérature et à ses tentatives d intégrer le champ littéraire de l époque. Une deuxième partie analyse la genèse de l œuvre romanesque à travers les différents articles de journaux ainsi que dans les premières ébauches de ce qui sera son grand œuvre, le roman de l exil. C est en particulier la lecture de la correspondance entre Vallès et ses amis Arthur Arnould et Hector Malot qui permet de sonder ses vraies motivations romanesques et ses interminables hésitations quant à la nature de son projet. Une troisième partie tente de démontrer chez Vallès une certaine constance des schémas et questionnements entre sa production journalistico-littéraire d avant l exil et sa production littéraire.This thesis, devoted to the work of Jules Vallès, has for objective the analysis of the process that drives an author to make of writing a tool of resistance, protest and even a weapon. Therefore, it will be necessary to question the work of the writer in the literary and social contexts of the era : the dialectic of the self and the group . The first part is devoted to Vallès first emergence in the world of literature and his attempts to adopt the literary norms of the era. The second part analyses the origin of the Novel through the different journalistic-writings, as well as, the rough outline of what will be his great work : the novel of the exile. The process is mainly based on Vallès correspondence with his friends : Arthur Arnould and Hector Malot, which allows probing his true novelistic motivations and his endless hesitations as for the nature of his project. The third part tries to demonstrate in Vallès a schematic constancy and questioning concerning his pre-exile literary production and journalistic literary production.ST DENIS-BU PARIS8 (930662101) / SudocSudocFranceF
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