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Lineaments Extraction from Gravity Data by Automatic Lineament Tracing Method in Sidi Bouzid Basin (Central Tunisia): Structural Framework Inference andHydrogeological Implication  [PDF]
Hajer Azaiez, Hakim Gabtni, Imen Bouyahya, Dorra Tanfous, Mourad Bedir
International Journal of Geosciences (IJG) , 2011, DOI: 10.4236/ijg.2011.23040
Abstract: The gravity method may be used in the exploration of deep sedimentary basins. It allows the structuring and the lateral and vertical extent of sedimentary fill to be determined. This study has concerned a qualitative and quantitative gravity analysis of Sidi Bouzid Basin in Central Tunisia. Bouguer anomaly analysis and Gravity data filtering allows us to emphasize the structures affecting the basin. The Automatic Lineament Tracing method helps to quantify the different gravity responses of faults located in the shallow and deep sedimentary sections and in the basement. The elaborated structural map of the study area constitutes a useful document for rationalizing the future groundwater exploration in the arid area of central Tunisia since it shows faults dipping and deep hydrogeologic sub-basin delineation.
Wind Energy Conversion Systems Adapted to the Tunisian Sites  [PDF]
Fathi Ben Amar, Mustapha Elamouri
Smart Grid and Renewable Energy (SGRE) , 2013, DOI: 10.4236/sgre.2013.41009
Abstract:

The choice of a wind turbine for a given site is a very significant operation. It is advised to make an in-depth study on the characteristics of the aerogenerator and the implantation site before any installation of a wind farm for choosing well the system best adapted to the energy needs. The objective of this study is to sensitize the users of the wind energy on the various problems involved in the aerogenerator installation on any site and to provide a decision-making aid to the judicious choice of the wind system best adapted. The idea is to estimate, for a selected implantation site, the energy production and the operating time of several wind systems. We can thus select the aerogenerator best adapted by making a compromise between a maximum recovery of energy and a high time of production. The influence height of the aerogenerator on energy profitability is also studied. We apply this step to the twenty six Tunisian synoptic sites by implantation scenarios of seven wind systems of various nominal speeds in function of the height.

Hydrochemical and Isotopic Study of Groundwater in the North Djeffara Aquifer, Gulf of Gabès, Southern Tunisia  [PDF]
Mohamed Fethi Ben Hamouda, Ahmed Mamou, Jelloul Bejaoui, Klaus Froehlich
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.48A001
Abstract:

The northern Djeffara aquifer system is located in the southeast ofTunisiaand extends over an area of400 km2. This multilayer system of aquifers is essentially recharged by infiltration of rain and by groundwater of the Continental Inter-calaire aquifer, and occurs mainly at two levels between 0 and180 mdepth that belong to the Mio-Pliocene to form the aquifers. A combined hydrogeologic and isotopic investigation using several chemical and isotopic tracers’, i.e., major ions, δ18O, δ2H and tritium, was carried out in order to determine the sources of water recharge to the aquifer and the origin of salinity. The results of geochemical and isotopic studies show that the groundwater in the south of the study area represents a mixture of the Djeffara aquifer groundwater and locally infiltrates modern recharge. In the northern part, the groundwater which resembles that of the Sekhira aquifer originates from locally infiltrated rain and runoff. The salinity of the groundwater is caused by dissolution of evaporate rocks (gypsum and halite minerals) in the aquifer system. The stable isotopes data do not support the hypothesis of mixing with seawater.

Ecological Study of Two Grasses: Cenchrus ciliaris and Digitaria commutate Endangered Autochthonous of the Dry Zone of Tunisia  [PDF]
Imen Dhib, Abdessalem Abdessamad, Mustapha Ksontini, Ali Ferchichi
Open Journal of Forestry (OJF) , 2014, DOI: 10.4236/ojf.2014.44041
Abstract:
The Saharian ecosystems present an important intensity of rising sensitization to: Erosion, and desertification whose impacts are irreversible. On the one hand, the weakness of the yield and the poverty of soil lead to a limited biodiversity. In addition to these difficulties, hydra is the main cause of the rarification of certain pastoral species such as Cenchrus ciliaris and Digitaria commutata. The ecological study underlines a distribution of these species which are very dependent on water resources in the dry regions of Tunisia. The bioclimatic (temperature, pluviometry) variations lead to modifications to these species from one area to another which are translated through several parameters. Concerning the number of bundles, the difference is important. The national park of Bouhedma records the highest number, compared with Bni khdach, Jerba, Khanguit aicha and Matmata respectively. The variation inter-site of study also is considerable by the study of the morphological parameters (height, number and length of leaves by bundle, number of ear) whose bundles of the national park Bouhedma occupy the first class.
Vertical Accuracy Assessment of SRTM Ver 4.1 and ASTER GDEM Ver 2 Using GPS Measurements in Central West of Tunisia  [PDF]
Ali Chaieb, Noamen Rebai, Samir Bouaziz
Journal of Geographic Information System (JGIS) , 2016, DOI: 10.4236/jgis.2016.81006
Abstract: This paper focuses on the quality of the vertical accuracy of two Digital Elevation Models, corresponding to Kasserine region, central west Tunisia. The vertical accuracy assessment is based on 23 GPS ground control points belonging to the study area. We applied a statistic analysis approach and established 3 elevation profiles corresponding to GPS, ASTER and SRTM. The erected statistical analysis reveals that the Root Mean Squared Error (RMSE) was 8.88 and 10.13 respectively for SRTM and ASTER DTMs. 2D elevation profiles constructed for GPS measurements, ASTER and SRTM, highlight that both DTMs underestimate the true elevation and that SRTM DTM is quite closer to the GPS elevation profile. Relying on this investigation, we think that both DTMs are significant for the vertical accuracy assessment and we urge that SRTM DTM might scheme the Kasserine area features better than ASTER DTM.
Epidemiology of Occupational Asthma in Tunisia: Results of a First National Study  [PDF]
Maoua Maher, El Maalel Olfa, Boughattas Wided, Chatti Souhail, Gharbi Ezzeddine, Kammoun Houda, Kalboussi Houda, Mlaouah Jabrane, Abbassi Ammar, Brahem Aicha, Loukil Mouna, Haj Salah Habib, Ben Khdimallah Khaled, Masmoudi Tasnim, Benzarti Mohamed, Debbabi Faten, Mrizak Néjib
Occupational Diseases and Environmental Medicine (ODEM) , 2016, DOI: 10.4236/odem.2016.42004
Abstract: Introduction: Apart from its increasingly important frequency, occupational asthma (OA) has become the most important cause of occupational respiratory disorders in developed countries. The number of etiological agents continues to grow following the constant introduction of new harmful substances in industry. Objectives: Determine the prevalence and incidence of OA in our country, the socio-occupational characteristics of asthmatics, and study the forensic and social impact of such pathology. Material and Methods: An exhaustive retrospective epidemiological study was conducted in Tunisia about charts of occupational asthma cases recognized by the competent commissions of the National Medical Care Fund (CNAM) during the period ranging from January 1st 2000 to December 31st 2008. Results: 361 occupational asthma cases, accounting for a prevalence of 7.17% of all occupational diseases, were recognized during the period of the study. Occupational asthma annual incidence was estimated to be 24.42 cases per 1000000 workers. Our study population was mainly women with a sex ratio of 0.86. More than a half (57.6%) of recognized OA cases were working in the textile industry sector. Concerning the asthmatics’ professional career, most of recognized OA cases (n = 225 i.e. 70.6% of cases) kept their jobs, whereas 58 patients did not. The professional career was linked to gender with a job loss that is 1.79 time more important in asthmatic women. Conclusion: The incidence of occupational asthma in Tunisia is comparable?with that found in other Mediterranean countries. A rigorous and adequate prevention is necessary and allows reducing the importance of this occupational pathology and its serious consequences.
Deep Water Status in Southwestern Tunisia  [PDF]
Thouraya Zemni, Mohsen Ben Alaya, Fouad Zargouni, Lahmaidi Moumni
Journal of Water Resource and Protection (JWARP) , 2016, DOI: 10.4236/jwarp.2016.86054
Abstract: Due to the water demand growth in southwestern Tunisia, particularly in Segui Gafsa-Tozeur area, the Tunisian Government launched a research program for new water resources in the lower Cretaceous layers within the Hauterivian and Barremian age. The present study highlights the major results of this project and defines the ability of the Barremian and Hauterivian series to be or not as good usable aquifers in this region. Seismic data show that the studied levels are located in deep trough with a very high depth. The water collected from the drilled wells in this region shows a very high salinity (80 g/l to 130 g/l) with a very low water level (-162 m/TN). These water levels are in hydrological isolation by faulting (faults trending NE-SW and NW-SE) with the Jerid area, where these layers are good water bearing. Thus, the studied series can't be considered as encouraging usable aquifers in the future. These results are crucial to make a decision and represent the guideline for research strategies in South-West Tunisia. Consequently, the government focuses on water search within the Turonian level which showed much more encouraging signs.
Multiplication et bulbaison in vitro du gla eul (Gladiolus grandiflorus Hort.)
Bettaieb, T.,Denden, M.,Hajlaoui, I.,Mhamdi, M.
Tropicultura , 2007,
Abstract: In vitro Multiplication and Bulb Formation of (Gladiolus grandiflorus Hort.). In order to set up a new bulb formation and micropropagation of gladiolus in vitro, trials were undertaken using two ornemental gladiolus cultivars 'Peter pears' and 'White friend ship'. The explants used are apical buds with 2 to 3 mm length taken from the cormes. In vitro initiation and multiplication were done for the two cultivars on Murashige and Skoog medium to which 2 mg. l-1 of BA and 0.5 mgl-1 of AIB were added. In vitro root development and bulb formation have been occurred in MS Agar Agar medium with 0.5 mg.l-1 of AIB 30 days later than the same MS medium containing 6% of saccharose and without Agar.
Hepatitis C Virus Antibodies in Dialysis Patients in Tunisia: A Single Center Study
Sassi F,Gorgi Y,Ayed K,Abdallah T
Saudi Journal of Kidney Diseases and Transplantation , 2000,
Abstract: Fifty-eight patients on maintenance hemodialysis in a dialysis unit at Tunis, Tunisia were tested for anti-hepatitis C virus (anti-HCV) antibodies by second generation ELISA test, and for HCV-RNA by nested reverse transcriptase polymerase chain reaction (RT-PCR) of 5′ non-coding region. Specificity of the antibodies was confirmed by immunoblot test. HCV genotype was defined using INNO-LIPA test. Twenty-seven out of 58 patients (46.5%) were reactive by ELISA. Transaminase levels were assessed over a six-month period and showed normal average values. Fourteen of the 27 anti-HCV positive patients (51%) were positive by RT-PCR. Type 1b HCV genotype was the most prevalent, seen in all the dialysis patients and one patient in addition, was co-infected with genotype 4. There was a significant correlation between the duration on dialysis (over five years) and the prevalence of anti-HCV-positive patients (P< 0.005) while no correlation existed between the number of blood transfusions and the presence of anti-HCV antibodies. The present study illustrates the high prevalence of HCV infection among Tunisian dialysis patients (51%) and indicates that the spread may be nosocomial rather than transfusion-related.
The Effect of Overweight on The Risk of Recurrence in Tunisian Patients with Operable Breast Cancer  [PDF]
Inès Ayadi Masmoudi, Amine Masmoudi, Nabil Toumi, Afef Khanfir, Mounir Frikha, Jamel Daoud
Journal of Cancer Therapy (JCT) , 2011, DOI: 10.4236/jct.2011.23040
Abstract: Obesity is associated with worse breast cancer outcomes in Western and Asian women. The present study was to determine the relation of body mass index (BMI) to disease-free survival (DFS) in Tunisian patients with operable breast cancer. We retrospectively reviewed data from 223 patients with operable breast cancer treated with primary surgery and adjuvant epirubicin-based chemotherapy. Patients were categorized into lower-BMI (<27.5 kg/m2; N=114) v higher-BMI (>27.5 kg/m2; N=113). Patients’and disease characteristics, including tumor size and lymph node status, were similar between the 2 groups. With a median follow-up of 56 months, there were 42 and 30 DFS events in the lower- and higher-BMI group, respectively (adjusted hazard ratio (HR): 0.74; 95% CI, 0.43 to 1.26; p=0.26). A significant interaction (p<0.001) was found between BMI category and time, with a significant DFS advantage for the higher-BMI group after 3 years (adjusted HR: 0.28; 95% CI, i to 0.86; p=0.03). We conclude that overweight is associated with a decreased risk of late recurrence in Tunisian patients with operable breast cancer.
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