Based on the semi-empirical methods to obtain the vibration model of molecule, the zigzag single-... more Based on the semi-empirical methods to obtain the vibration model of molecule, the zigzag single-walled Boron nitride nanotube (BNNTs) with (8, 0) structure were investigated. Geometry optimizations and vibrational frequencies of BNNTs were carried out at AM1, CNDO, MNDO, M1NDO3 and MC using hyperchem 6 suites of program. The combination and their normalization coefficients of (8, 0) nanotube in C6V point group was calculated and the effect of dielectric constants on the mechanism of these vibrations in nanotubes was studied. This study show that in the high dielectric, the frequency of vibration has alternative behavior, but by the decreasing of the dielectric, this behavior change to stable situation of geometry.
This paper presents a new bi-objective multi-modal hub location problem with multiple assignment ... more This paper presents a new bi-objective multi-modal hub location problem with multiple assignment and capacity considerations for the design of an urban public transportation network under uncertainty. Because of the high construction costs of hub links in an urban public transportation network, it is not economic to create a complete hub network. Moreover, the demand is assumed to be dependent on the utility proposed by each hub. Thus, the elasticity of the demand is considered in this paper. The presented model also has the ability to compute the number of each type of transportation vehicles between every two hubs. The objectives of this model are to maximize the benefits of transportation by establishing hub facilities and to minimize the total transportation time. Since exact values of some parameters are not known in advance, a fuzzy multi-objective programming based approach is proposed to optimally solve small-sized problems. For medium and large-sized problems, a meta-heuris...
Engineering Geology for Society and Territory - Volume 5, 2014
Swelling soils (below S2) due to volumetric clays changes under various atmospheric dryness and w... more Swelling soils (below S2) due to volumetric clays changes under various atmospheric dryness and wet climatic conditions, induce small topographic surface displacements and therefore affects and deforms overlying buildings. It is a major concern for societies due to both its large spatial extension and to its so expensive costs for remediation. The aim of this work is therefore to locate, characterize and to quantify those small humidity-dependant topographic displacements through new interferometric methods such as Differential Interferometry (DinSAR) as well as Persistent Scatterers Interferometry (PSI) applied to the Paris area (France). If the Differential Radar Interferometry (DinSAR) is a method that enables one to map relative surface displacements from two different radar images acquired on a specific area with a different time span. It gives a rather poor monitoring result in the eastern Paris Basin due to the paucity (versus lack) of coherence in the Paris surroundings despite they are highly affected by recent dryness hazards (last major crisis in 2003). On the contrary, most promising and interesting results are obtained through Persistent Scatterer Interferometry (PSI) that revealed so precisely the absolute surface continuous displacements through time of the topography due to the variation of geometry of the swelling soils (below S2). The latter are highly linked to seasonal climatic parameters as highlighted by the processing of more than 400 ascending and descending radar images. We then succeed to monitor the small topographic displacements through time of the eastern Paris area. In order to validate this approach, we used an home made GIS data base where we compare quaternary geology, lithology, vegetations, buildings and deformed buildings and topographic displacements acquired with interferometric studies. As a result, we realized herein that the vegetation and specifically trees are of first order for the individual building deformations due to S2. Furthermore we note that each trees species have a specific behaviour toward S2 due to both their root geometry (planimetric versus vertical geometry) and their maturity. We propose herein to calculate the potential S2 deformation due to the trees evapotranspiration by quantifiing by trees average altitude above the ground depending of species. Therefore each species of trees due to their differential evapo-transpiration have a specific «planimetric extension agressivity». By combining the geometry of the roots of the trees (surficial contrasting to vertical) and looking for both our wok in the fields and the bibliography, we were herein able to determine the planimetric extension of the « underground water pumping agressivity of each trees species » on swelling soils deformation which is directly related to evapotranspiration. This application presents high potential to better understand the swelling soils natural hazards and the induced and associated geological processes on the individual buildings.
The density functional theory (DFT) has been used to simultaneously investigate physic/chemi-sorp... more The density functional theory (DFT) has been used to simultaneously investigate physic/chemi-sorption properties of oxygen on the (5, 5) boron nitride nanotube (BNNT). Geometry optimizations were carried out at B3LYP/6-31G*level of theory using gaussian 98 suites of program. physisorption of O2outside the BNNT with a vertical orientation to the tube axis above a boron atom is the most stable state of physisorption and its binding energy is -0.775 kcal/mol. In the chemisorption of O2molecule, the most stable state is above two adjacent B and N atoms of a hexagon with a B-N bond length of 2.503 Å and the binding energy of adsorbed oxygen atoms -14.389 kcal/mol. Based on these results, We also provide the effects of O2adsorption on the electronic properties of BNNTs.
Based on the semi-empirical methods to obtain the vibration model of molecule, the zigzag single-... more Based on the semi-empirical methods to obtain the vibration model of molecule, the zigzag single-walled Boron nitride nanotube (BNNTs) with (8, 0) structure were investigated. Geometry optimizations and vibrational frequencies of BNNTs were carried out at AM1, CNDO, MNDO, M1NDO3 and MC using hyperchem 6 suites of program. The combination and their normalization coefficients of (8, 0) nanotube in C6V point group was calculated and the effect of dielectric constants on the mechanism of these vibrations in nanotubes was studied. This study show that in the high dielectric, the frequency of vibration has alternative behavior, but by the decreasing of the dielectric, this behavior change to stable situation of geometry.
This paper presents a new bi-objective multi-modal hub location problem with multiple assignment ... more This paper presents a new bi-objective multi-modal hub location problem with multiple assignment and capacity considerations for the design of an urban public transportation network under uncertainty. Because of the high construction costs of hub links in an urban public transportation network, it is not economic to create a complete hub network. Moreover, the demand is assumed to be dependent on the utility proposed by each hub. Thus, the elasticity of the demand is considered in this paper. The presented model also has the ability to compute the number of each type of transportation vehicles between every two hubs. The objectives of this model are to maximize the benefits of transportation by establishing hub facilities and to minimize the total transportation time. Since exact values of some parameters are not known in advance, a fuzzy multi-objective programming based approach is proposed to optimally solve small-sized problems. For medium and large-sized problems, a meta-heuris...
Engineering Geology for Society and Territory - Volume 5, 2014
Swelling soils (below S2) due to volumetric clays changes under various atmospheric dryness and w... more Swelling soils (below S2) due to volumetric clays changes under various atmospheric dryness and wet climatic conditions, induce small topographic surface displacements and therefore affects and deforms overlying buildings. It is a major concern for societies due to both its large spatial extension and to its so expensive costs for remediation. The aim of this work is therefore to locate, characterize and to quantify those small humidity-dependant topographic displacements through new interferometric methods such as Differential Interferometry (DinSAR) as well as Persistent Scatterers Interferometry (PSI) applied to the Paris area (France). If the Differential Radar Interferometry (DinSAR) is a method that enables one to map relative surface displacements from two different radar images acquired on a specific area with a different time span. It gives a rather poor monitoring result in the eastern Paris Basin due to the paucity (versus lack) of coherence in the Paris surroundings despite they are highly affected by recent dryness hazards (last major crisis in 2003). On the contrary, most promising and interesting results are obtained through Persistent Scatterer Interferometry (PSI) that revealed so precisely the absolute surface continuous displacements through time of the topography due to the variation of geometry of the swelling soils (below S2). The latter are highly linked to seasonal climatic parameters as highlighted by the processing of more than 400 ascending and descending radar images. We then succeed to monitor the small topographic displacements through time of the eastern Paris area. In order to validate this approach, we used an home made GIS data base where we compare quaternary geology, lithology, vegetations, buildings and deformed buildings and topographic displacements acquired with interferometric studies. As a result, we realized herein that the vegetation and specifically trees are of first order for the individual building deformations due to S2. Furthermore we note that each trees species have a specific behaviour toward S2 due to both their root geometry (planimetric versus vertical geometry) and their maturity. We propose herein to calculate the potential S2 deformation due to the trees evapotranspiration by quantifiing by trees average altitude above the ground depending of species. Therefore each species of trees due to their differential evapo-transpiration have a specific «planimetric extension agressivity». By combining the geometry of the roots of the trees (surficial contrasting to vertical) and looking for both our wok in the fields and the bibliography, we were herein able to determine the planimetric extension of the « underground water pumping agressivity of each trees species » on swelling soils deformation which is directly related to evapotranspiration. This application presents high potential to better understand the swelling soils natural hazards and the induced and associated geological processes on the individual buildings.
The density functional theory (DFT) has been used to simultaneously investigate physic/chemi-sorp... more The density functional theory (DFT) has been used to simultaneously investigate physic/chemi-sorption properties of oxygen on the (5, 5) boron nitride nanotube (BNNT). Geometry optimizations were carried out at B3LYP/6-31G*level of theory using gaussian 98 suites of program. physisorption of O2outside the BNNT with a vertical orientation to the tube axis above a boron atom is the most stable state of physisorption and its binding energy is -0.775 kcal/mol. In the chemisorption of O2molecule, the most stable state is above two adjacent B and N atoms of a hexagon with a B-N bond length of 2.503 Å and the binding energy of adsorbed oxygen atoms -14.389 kcal/mol. Based on these results, We also provide the effects of O2adsorption on the electronic properties of BNNTs.
Uploads
Papers by f. kaveh