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Search Results: 1 - 10 of 9446 matches for " Ahmed Madani "
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Assessment and Evaluation of Band Ratios, Brovey and HSV Techniques for Lithologic Discrimination and Mapping Using Landsat ETM+ and SPOT-5 Data  [PDF]
Ahmed Madani
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.51002

This study aims to assess and to evaluate band ratios, brovey and HSV (Hue-Saturation-Value) techniques for discrimination and mapping the basement rock units exposed at Wadi Bulghah area, Saudi Arabia using multispectral Landsat ETM+ and SPOT-5 panchromatic data. FieldSpec instrument is utilized to collect the spectral data of diorite, marble, gossan and volcanics, the main rock units exposed at the study area. Spectral profile of diorite exhibits very distinguished absorption features around 2.20 μm and 2.35 μm wavelength regions. These absorption features lead to lowering the band ratio values within the band-7 wavelength region. Diorite intrusions appear to have grey and dark grey image signatures on 7/3 and 7/2 band ratio images respectively. On the false color composite ratio image (7/3:R; 7/2:G and 5/2:B), diorite, marble, gossan and volcanics have very dark brown, dark blue, white and yellowish brown image signatures respectively. Image fusion between previously mentioned FCC ratio image and high spatial resolution (5 meters) SPOT-5 panchromatic image is carried out by using brovey and HSV transformation

Examination of the Level of Heavy Metals in Wastewater of Bandar Abbas Wastewater Treatment Plant  [PDF]
Gholamreza Mansourri, Mehrzad Madani
Open Journal of Ecology (OJE) , 2016, DOI: 10.4236/oje.2016.62006
Abstract: One of the main environmental pollutants is heavy metals. Due to extensive usage in industry, these metals enter biological cycle rapidly and contaminated water and soil resources rapidly. In this work, lead, copper, zinc and chromium of Bandar Abbas wastewater are examined. For this research, nine stations were set for measurement in urban level in Bandar Abbas and sampling of aforesaid metals was performed in fall and winter 2006 in these stations. After extraction and preparation operations using APDC-MIBK, samples were measured using flame atomic absorption system. According to results, concentrate of studied metals was lower than allowable standard value set by Iran environmental protection organization for agricultural purposes and sewage to ground level waters. In addition, efficiency of Bandar Abbas wastewater treatment plant to remove these metals is 40% - 70% from which highest removal is for zinc as much as 71.1% and lowest level is for copper as much as 40.5%. However, copper level was higher than allowable level for agricultural purposes in spring and summer (0.21 mg/L and 0.23 mg/L, respectively) and lower in fall and winter (0.103 mg/L and 0.098 mg/L, respectively). Furthermore, changes in concentration of metals in these stations in various seasons were measured and analyzed using one-way variance analysis and simultaneous effects of time and place on measured variables were analyzed using two-way variance analysis.
Hepatitis C virus infections reported in Saudi Arabia over 11 years of surveillance
Madani Tariq
Annals of Saudi Medicine , 2007,
De la campagne à la ville : échanges, exploitation et immigration dans le Maghreb médiéval From countryside to the city: exchanges, exploitation, and immigration in the medieval Maghrib
Tariq Madani
Revue des Mondes Musulmans et de la Méditerranée , 2012, DOI: 10.4000/remmm.6413
Abstract: The relation between Maghribi cities and their hinterland has yet to be explored in depth. Insufficient archives and the lack of archaeological approaches are slowing down the understanding of the various manifestations of this issue. Without being aware of the economic, social, and cultural phenomena of the countryside, it is not yet possible to ask fundamental historical questions. A theoretical and historical contextualization shows diverse cases and complex relations that are not unilateral between Islamic cities and their hinterland. In other words, one cannot reach reliable conclusions concerning global or regional history without putting together, across centuries, exploitative relations along with interdependency within a division of labor and resources that link the city with its environment. Marketing agricultural produces and products in the city, the natural function of an outlet for rural population, the function of a judicial and administrative center, and the function of a locus for acculturation of multiple ethnic groups, are aspects less conflictual of these relations that should be included in discussion, in order to recapture them at the stage of a synthesis.
The Yamabe problem with singularities
Farid Madani
Mathematics , 2008, DOI: 10.1016/j.bulsci.2007.09.004
Abstract: Let $(M,g)$ be a compact Riemannian manifold of dimension $n\geq 3$. Under some assumptions, we prove that there exists a positive function $\varphi$ solution of the following Yamabe type equation \Delta \varphi+ h\varphi= \tilde h \varphi^{\frac{n+2}{n-2}} where $h\in L^p(M)$, $p>n/2$ and $\tilde h\in \mathbb R$. We give the regularity of $\varphi$ with respect to the value of $p$. Finally, we consider the results in geometry when $g$ is a singular Riemannian metric and $h=\frac{n-2}{4(n-1)}R_g$, where $R_g$ is the scalar curvature of $g$.
Hebey-Vaugon conjecture II
Farid Madani
Mathematics , 2011,
Abstract: In this paper we consider the remaining cases of Hebey-Vaugon conjecture.
Equivariant Yamabe problem and Hebey-Vaugon conjecture
Farid Madani
Mathematics , 2009, DOI: 10.1016/j.jfa.2009.10.002
Abstract: In their study of the Yamabe problem in the presence of isometry group, Hebey and Vaugon announced a conjecture. This conjecture generalizes Aubin's conjecture, which has already been proven and is sufficient to solve the Yamabe problem. In this paper, we generalize Aubin's theorem and we prove the Hebey--Vaugon conjecture in some new cases.
A detailed proof of a theorem of Aubin
Farid Madani
Mathematics , 2013,
Abstract: In this note we give a detailed proof of a theorem of Aubin.
Le probléme de Yamabe avec singularités et la conjecture de Hebey-Vaugon
Farid Madani
Mathematics , 2009,
Abstract: In the first part of this thesis, we study the Yamabe problem with singularities, that we can announce as follow: Given a compact Riemannian manifold $(M,g)$, find a constant scalar curvature metric, conformal to $g$, when $g$ has not necessarily the usual regularity (it can be $C^1$). To solve this problem, we start the study of the Yamabe type equations. We show that all the known properties in the smooth case are still valid. Under some assumptions, we prove the existence and uniqueness of solutions. The second part is dedicated to the Hebey-Vaugon conjecture, stated in their paper about the equivariant Yamabe problem. We prove that this conjecture is true in some new cases, after we generalize T. Aubin's theorem.
Polynomial Value Iteration Algorithms for Detrerminstic MDPs
Omid Madani
Computer Science , 2012,
Abstract: Value iteration is a commonly used and empirically competitive method in solving many Markov decision process problems. However, it is known that value iteration has only pseudo-polynomial complexity in general. We establish a somewhat surprising polynomial bound for value iteration on deterministic Markov decision (DMDP) problems. We show that the basic value iteration procedure converges to the highest average reward cycle on a DMDP problem in heta(n^2) iterations, or heta(mn^2) total time, where n denotes the number of states, and m the number of edges. We give two extensions of value iteration that solve the DMDP in heta(mn) time. We explore the analysis of policy iteration algorithms and report on an empirical study of value iteration showing that its convergence is much faster on random sparse graphs.
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