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Nafez Nehme Harb

Assistant professor
Life & Earth Sciences department - Section III - Tripoli
Speciality: Environmental Geosciences
Specific Speciality: Hydrogeology

Positions
Teaching 7 Taught Courses
(2014-2015) BIOG 403 - Hydrogeology Lab

M1 Plant Biology and Environment

(2014-2015) BioG 402 - Hydrogeology

M1 Environmental and life Sciences - Option : Geology

(2014-2015) BIOG 404 - Paleontology

M1 Plant Biology and Environment

(2014-2015) BIOG 405 - Paleontology Lab

M1 Plant Biology and Environment

(2014-2015) Biol 114 - Organization of the plant living world and environment

BS Earth and life sciences

(2014-2015) Biol 217 - Zoology II (vertebrates)

BS Earth and life sciences

(2014-2015) Biol 247 - Zoology II (vertebrates) Lab

BS Earth and life sciences

Education
1990: Diplome de 3eme cycle

Universite d'Amiens
Gestion des entreprises

1981 - 1981: Diplome en Hydrologie et Hydrauliques souterraines

Institut de Geodynamique -Universite de Bordeaux III
Hydrogeologie

1980 - 1980: DEA

Universite de Bordeaux I
Geophysique et Application au domaine marin

PhD

universite de Bordeaux-France
Geologie Appliquee .Option : Hydrogeologie et Geophysique

Maitre de conference

Publications 4 publications
Samer Farkh, Nafez Harb, Katia Haddad, Zaher Zeaiter, Samir Farkh Improvement Of The U-Th Method For Dating Of Impure Calcite Having A Large Amount Of Clay And Very Low Uranium Content International Journal of Scientific & Technology Research 2015

Abstract: The U-Th method, also called series method of uranium, is improved by a new experimental protocol and successfully applied to the impure calcite (with uranium concentration <0,05 dpm/g) which was previously difficult to be dated accurately. Our experiments performed on 15 calcite samples taken from France and Morocco, have highlighted the importance of this methodological improvement by enabling: (i) the elimination of 100 % of clay residues, (ii) the reduction of calcite quantity necessary to the chemical manipulation from 20g to 5g, (iii) the analysis of calcite samples poor in uranium and on the other hand rich with clay and (iiii) the reduction of the lower limit of the U-Th method from 10 Kyrs to 6 Kyrs. The optimization of U-Th method in this work provided a better dating of the accurate age of calcite. Thus, this technique is important for the chemical analysis of stalagmite floors of different caves in the region of the Near East.

Ali Kanso (1), Antoine G. El Samrani (1), Emilio Nehmeh(2), Véronique Kazpard(1), Rawaa Ammar, Nafez Harb, Ahmad Kobaissi Valorizing Phosphogypsum as a Set Retarder in Portland (IJIRSE) International Journal of Innovative Research in Science & Engineering 2014

Phosphogypsum is a by-product in phosphate fertilizers and phosphoric acid industries. It is valorized as a set retarder in Portland cement replacing the gypsum rocks. In this study, influence of phosphogypsum contents on concrete and Portland cement properties was investigated. Phosphogypsum was mixed with Portland cement at different mass contents extended from 1 to 20% wt/wt. Setting time, specific area of Portland cement and response to compression strength were followed. Chemical characteristics and heavy metals release into buffered acidic and alkaline aqueous solutions were also investigated. Obtained results showed that less than 8% of phosphogypsum is the best mass content to enhance cement quality without altering significantly the mechanical properties. The highest compressive strength applied to concrete was recorded after 28 days under saturated humidity conditioning. Conversely, the increase of phosphogypsum content in cement over than 8% resulted in a decrease of mechanical strengths of the corresponding concrete. Metal leaching experiments were conducted on different mixture of concrete mortars immersed in buffered acid solutions. Leaching results have showed that highest concentration of chromium, zinc, copper and lead are transferred to aqueous media during the first three days of impregnation. Zinc had a particular behavior. It was entrapped in concrete mortars before being transferred into aqueous solutions. In addition, metal release was significantly enhanced when phosphogypsum contents increased in the cement.

Hussein Jaafar Kanbar, Nour Hanna, Antoine G. El Samrani, Veronique Kazpard, Ahmad Kobaissi, Nafez Harb & Nabil Amacha Metal binding in soil cores and sediments in the vicinity of a dammed agricultural and industrial watershed Environmental Monitoring and assessment 2014

The environment is witnessing a downgrade caused by the amelioration of the industrial and agricultural sectors, namely, soil and sediment compartments. For those reasons, a comparative study was done between soil cores and sediments taken from two locations in the Qaraaoun reservoir, Lebanon. The soil cores were partitioned into several layers. Each layer was analyzed for several physicochemical parameters, such as functional groups, particle size distribution, ζ-potential, texture, pH, electric conductivity, total dissolved solids, organic matter, cation exchange capacity, active and total calcareous, available sodium and potassium, and metal content (cadmium, copper, and lead). The metal content of each site was linked to soil composition and characteristics. The two sites showed distinguishable characteristics for features such as organic matter, pH, mineral fraction, calcareous, and metal content. The samples taken toward the south site (Q1), though contain lower organic matter than the other but are more calcareous, showed higher metal content in comparison to the other site (Q2) (average metal content of Q1 > Q2; for Cd 3.8 > 1.8 mg/kg, Cu 28.6 > 21.9 mg/kg, Pb 26.7 > 19 mg/kg). However, the metal content in this study did not correlate as much to the organic matter; rather, it was influenced by the location of the samples with respect to the dam, the reservoir’s hydrodynamics, the calcareous nature of the soil, and the variation of the industrial and agricultural influence on each site.

Nafez Harb, Katia Haddad and Samer Farkh CALCULATION OF TRANSVERSE RESISTANCE Lebanese Science Journal 2010

Serious difficulties are generally encountered during the interpretation of vertical electric sounding curves (VES). The purpose of this study is to correct the resistivity values of saturated aquifers by utilizing the conductivity and transverse resistance of the dry and saturated zones as revealed by resistivity well-logging technique. The true resistivity, ρ3, of the saturated zone, was calculated. The transverse resistance values were then corrected for all vertical electric sounding results. This procedure makes it possible to delineate and quantify underground water zones, based on the maps of hydrogeological and physical properties of aquifers.

Supervision 2 Supervised Students
La pollution biologique de l'eau potable

Oula Hassan
BioA 421 -Master 1- 2013

Par la multitude des sources de contamination des eaux, on a pu classer les eaux usees en trois classes majeures selon leurs caracteristiques physico-chimiques et biologiques. Il y a les eaux usees domestiques, les eaux usees industrielles, et les eaux usees pluviales et leur impact sur l'eau potable. Les principaux polluants biologiques sont soit des virus, soit des bacteries, ou des parasites.Les principales bacteries pathogenes et toxiques sont : Salmonella, Shigella, E. Coli, Vibrio Cholerae. Les bacteries indicatrices de pollution sont les Coliformes fecaux, et streptocoques fecaux. Les principaux virus sont ceux de l'hepatite et les virus causant les infections gastro-enterites. Pour les parasites, il y a les Helminthes et les protozoaires.

L'impact de la presence d'arsenic dans l'eau sur la sante de l'Homme.

Bochra Zaylaa
BioA 421-M1 -2013

La limite d'Arsenic dans l'eau potable selon l'OMS est de 0,01 mg/l. L'augmentation du taux d'Arsenic dans l'eau comme par exemple dans les villes industrielles tel que chekka augmente le risque de cancers de peau, des poumons , de la vessie et des reins chez les habitants.L'Arsenic se trouve naturellement dans les roches de la croute terrestre. Il peut s'infiltrer dans l'eau potable à partir de dépôts naturels ou d'écoulements des procédés agricoles.

Languages
Arabic

Native or bilingual proficiency

Dutch

Limited working proficiency

English

Professional working proficiency

French

Full professional proficiency