ONE STEP ELECTRODEPOSITION OF CuInSe2 THIN FILMS

Formation of CuInSe2 (CIS) thin films from aqueous solution containing citrate as complexing agent is reported. The surface morphology and the composition of the deposited films are characterized by scanning electron microscopy (SEM). The texture of the deposits and their compositions are analyzed by X-ray diffraction and transmission electron microscopy (TEM). Annealing of the films at 350°C in flowing argon electrodeposited at potentials in the range [-0.24, -0.4 (V vs Ag/AgCl)] resulted in the formation of alpha-Cu 2 Se (JCPDS 24-1131) and CuSe (JCPDS 6-0427). On the contrary, annealing in the same conditions of the films electrodeposited between -0.4 and -0.6 V vs Ag/AgCl led to the formation of chalcopyrite CuInSe 2 (JCPDS 23-209) with alpha-Cu 2 Se (JCPDS 24-1131) as secondary phase. The formation of CuInSe 2 films with a chalcopyrite structure and good stoichiometry is observed.Formation of CuInSe2 (CIS) thin films from aqueous solution containing citrate as complexing agent is reported. The surface morphology and the composition of the deposited films are characterized by scanning electron microscopy (SEM). The texture of the deposits and their compositions are analyzed by X-ray diffraction and transmission electron microscopy (TEM). Annealing of the films at 350°C in flowing argon electrodeposited at potentials in the range [-0.24, -0.4 (V vs Ag/AgCl)] resulted in the formation of alpha-Cu 2 Se (JCPDS 24-1131) and CuSe (JCPDS 6-0427). On the contrary, annealing in the same conditions of the films electrodeposited between -0.4 and -0.6 V vs Ag/AgCl led to the formation of chalcopyrite CuInSe 2 (JCPDS 23-209) with alpha-Cu 2 Se (JCPDS 24-1131) as secondary phase. The formation of CuInSe 2 films with a chalcopyrite structure and good stoichiometry is observed

Physical properties of CdSexTe1-x thin films prepared by electrodeposition

The cadmium chalcogenides CdSexTe1-x (0≤x ≤1 ) thin films have been electrodeposited onto ITO coated glass substrates from an acid sulphate solution at 90 °C. The structure, the composition and the morphology have been studied as a function of the x coefficient by XRD, EDAX, optical absorbance and AFM techniques. All deposits have a cubic structure with a preferred orientation along the (111) direction. The composition in the films is found to vary linearly with the composition in the solution. The increase of the amount of tellurium in the CdSexTe1-x films decreases the band gap down to 1.35 eV and increases the lattice constant. The photoelectrochemical studies in a polysulfide electrolyte show that CdSexTe1-x thin films behave as n-type semiconductors.The cadmium chalcogenides CdSexTe1-x (0≤x ≤1 ) thin films have been electrodeposited onto ITO coated glass substrates from an acid sulphate solution at 90 °C. The structure, the composition and the morphology have been studied as a function of the x coefficient by XRD, EDAX, optical absorbance and AFM techniques. All deposits have a cubic structure with a preferred orientation along the (111) direction. The composition in the films is found to vary linearly with the composition in the solution. The increase of the amount of tellurium in the CdSexTe1-x films decreases the band gap down to 1.35 eV and increases the lattice constant. The photoelectrochemical studies in a polysulfide electrolyte show that CdSexTe1-x thin films behave as n-type semiconductors

Effect of heat treatment with CdCl2 on the electrodeposited CdTe/CdS heterojunction

CdS/CdTe heterojunction was subjected to chemical treatment commonly used in photovoltaic device fabrication to determine the resulting microscopic effect on the morphology and structure. CdS and CdTe thin films were electrodeposited successively onto indium tin oxide (ITO) from aqueous solution. Containing CdCl2 and Na2S2O3 for the deposition of thin film windows, the ITO/CdS resulting substrates was then used for the deposition of CdTe thin film absorber using aqueous solution of CdSO4 and TeO2. Next CdCl2 dip followed by 400°C heat treatment was used to modify the CdTe/CdS surface and interface. Scanning electron microscopy (SEM) and Atomic force microscopy (AFM) were used to evaluate the resulting surface morphology. X-ray diffraction analysis reveals that the heat treatment enhances the recrystallisation and shifts the CdTe peaks towards a smaller lattice parameter.CdS/CdTe heterojunction was subjected to chemical treatment commonly used in photovoltaic device fabrication to determine the resulting microscopic effect on the morphology and structure. CdS and CdTe thin films were electrodeposited successively onto indium tin oxide (ITO) from aqueous solution. Containing CdCl2 and Na2S2O3 for the deposition of thin film windows, the ITO/CdS resulting substrates was then used for the deposition of CdTe thin film absorber using aqueous solution of CdSO4 and TeO2. Next CdCl2 dip followed by 400°C heat treatment was used to modify the CdTe/CdS surface and interface. Scanning electron microscopy (SEM) and Atomic force microscopy (AFM) were used to evaluate the resulting surface morphology. X-ray diffraction analysis reveals that the heat treatment enhances the recrystallisation and shifts the CdTe peaks towards a smaller lattice parameter

Influence de la fertilisation azotée sur l'activité nitrate réductase et sur les teneurs en nitrates des feuilles et racines principales de la betterave à sucre (Beta vulgaris Var. Maghribel)

L'activité nitrate réductase (ANR) a été mesurée dans les feuilles (limbes et pétioles) et dans les racines pivotantes (partie sous le collet, partie médiane et pointe de la racine principale) de la betterave à sucre cultivée en plein champ. L'ANR est toujours élevée dans les jeunes tissus racinaires ou foliaires. Elle se localise surtout au niveau du limbe. Au fur et à mesure que la plante se développe, l'ANR diminue dans les différents organes et surtout dans la racine; elle diminue au cours de la tubérisation pour s'annuler vers le 140ème jour après semis. L'évolution de cette ANR suit celle des teneurs en nitrates des différents organes. L'effet de l'azote sur l'ANR et sur les teneurs en nitrates est très hautement significatif

Surface Optical Waves at Air/Metal Interfaces: Surface Plasmon Polaritons

The surface plasmon resonance (SPR) phenomenon has been known for nearly five decades now; since then this method has made great advances in terms of instrumentation development and applications, and it still attracts researchers because of certain subtle issues that could benefit from it mainly detection and analysis of chemical and biochemical substances in different areas including medicine, environmental monitoring, biotechnology and drug and food monitoring. Our interest is focused on the use of this technique for studying thin coating and some application in nanophotonics. In this paper, we discuss the configuration of surface plasmons at air/metal interface by Atenuated total reflection (ATR) technique in the Kretchman configuration, and we present preliminary experimental results on surface plasmons at a Ag/air interface that we obtained in our laboratory.The surface plasmon resonance (SPR) phenomenon has been known for nearly five decades now; since then this method has made great advances in terms of instrumentation development and applications, and it still attracts researchers because of certain subtle issues that could benefit from it mainly detection and analysis of chemical and biochemical substances in different areas including medicine, environmental monitoring, biotechnology and drug and food monitoring. Our interest is focused on the use of this technique for studying thin coating and some application in nanophotonics. In this paper, we discuss the configuration of surface plasmons at air/metal interface by Atenuated total reflection (ATR) technique in the Kretchman configuration, and we present preliminary experimental results on surface plasmons at a Ag/air interface that we obtained in our laboratory

Éléments d’aide au contrôle de gestion et au management de l’agrumiculture au Maroc

L’étude est dédiée aux grandes entreprises agrumicoles structurées et décentralisées. Elle fournit les éléments agronomiques et financiers pour un modèle de contrôle de gestion de type bottom-up concevable à partir de l’expérience sur la nouvelle agrumiculture née du plan Maroc Vert. Le modèle suppose la transparence, un travail en partenariat fermes-contrôle de gestion, un système d’information fiable et une fluidité de circulation de l’information. En agriculture, il n’y a pas d’analogie parfaite avec l’industrie concernant l’évaluation des écarts de performance par rapport aux objectifs de gestion affichés par le budget. Dans l’industrie, les mêmes inputs et le même process produisent en général le même résultat, ce qui facilite amplement l’analyse des écarts constatés et aide beaucoup à proposer des mesures correctives. En agriculture, avec une même quantité d’inputs (eau, engrais, pesticides), et un même process de production (porte greffe, variété, densité, taille), le résultat peut être très différent selon l’année climatique, la région ou le type de sol. Par conséquent, le plus important dans cette activité, n’est pas l’écart de performance lui-même, mais de pouvoir expliquer la part de cet écart qui revient à la gestion et celle due aux facteurs externes non maitrisables du milieu. Une contre-performance sur la productivité ou la qualité peut être la conséquence d’effets pervers d’un Chergui (chute des fruits, marbrures, coup de soleil) alors qu’aucune modification n’a été apportée au process usuel de production. De même qu’une excellente performance est parfois en partie le fait d’une année climatique favorable et d’un bon prix sur le marché et non d’un effort particulier de gestion. Cette énorme difficulté à prévoir avec une certaine confiance, ce que sera le comportement du verger d’une année à l’autre, rend donc malaisé l’usage de « normes » figées pour le contrôle de gestion. C’est pourquoi dans la présente étude, l’effort a plus porté sur l’exploration des causes des écarts autour des chiffres moyens que sur les chiffres eux-mêmes. Au Maroc, on est en présence d’un système économique libéral certes, mais la surproduction avec l’idée d’ensuite vendre les agrumes « a dime a dozen » ou de laisser la main invisible d’Adam Smith réguler le marché n’a jamais été un objectif du plan Maroc Vert. Le but recherché, est plutôt de produire pour ensuite exporter davantage afin d’améliorer la balance commerciale du pays. Aujourd’hui, on est en situation d’offre excessive en petits fruits aggravée par un Export qui peine à monter en charge, il est donc légitime que chacun cherche à tirer son épingle du jeu. Faute de pouvoir agir sur les prix, la mission basique du contrôle de gestion est donc de maîtriser au moins les charges. Même si la vraie solution pour le Maroc, aurait été plutôt d’instaurer un super-contrôle de gestion innovant de type filière avec notamment des prérogatives de gel provisoire des plantations, le temps de conquérir de nouveaux marchés. Ce que nous craignions est maintenant arrivé en 2018, c'est-à-dire finir après autant d’investissements par vendre la clémentine de qualité sur le marché local à 10cts/kg. L’étude suggère entre autres, comment sortir de cette période trouble et surmonter la crise avec un minimum de dégâts pour le producteur. Mots clés : Contrôle de gestion, agrumes, MarocThe study concerns the large structured and decentralized citrus fruit companies. It provides the agronomic and financial tools for management control. The present management model is based on a bottom-up design. It is inspired from the new citrus cropping experience born from the Green Morocco plan. The model assumes transparency, farm and management control partnership, reliable information system and fluidity of information. In agriculture, there is no perfect analogy with the industry sector concerning the assessment of performance gaps compared to the management objectives reported by the budget. In industry, the same inputs combined to the same process generally produce the same result. Thus, the analysis of the observed performance gaps become easier and corrective measures can be suggested. In agriculture, the result can’t be similar even the same amount of inputs (water, fertilizer, pesticides), and the same production process (rootstock, cultivar, density, pruning) have been used. This situation is related to climatic year, location and soil type. Therefore, the most important in agricultural activity, is to explain the causes of the performance gap. Then, to classify these causes into manageable factors and not manageable factors of the environment. A low performance on productivity or quality can be related to the negative effect of “Chergui” wind (fall, physical damage, sunburn, ...) even we keep the same usual production process. Also, an excellent performance is sometimes related to a very good climate year and not to a specific management effort. The enormous difficulty of predicting confidently the orchard behavior, for each year, constrains the establishment of fixed "standards" useful for management control. Thus, in the present study, we try to explore causes of deviations around average numbers. In Morocco, a liberal economy is established. However, the overproduction with the idea of selling the citrus fruit as dime a dozen or leaving the Adam Smith invisible hand regulates the market has never been the goal of the Green Morocco Plan. Such plan aims to produce and to export more in order to improve the country's trade balance. Today, we are in a situation of excessive clementine supply aggravated by the difficulty to increase export quantity. This situation pushes each producer to perform well. Regarding the difficulty to regulate prices, the basic mission of the management control is to master at least the production costs. The true solution would to introduce an innovative super-control management of citrus sector. This management would include a provisional plantation freezing waiting for finding new markets. In fact, the feared problem is occurred in 2018. Indeed, high quality clementine has been sold at 10 cts kg-1. on the local market after many investments of the producer. The study aims to give suggestions to producers on how to manage this troubled period and overcome the crisis with minimal damage. Key words: Management control, citrus fruits, Morocc

Éléments d’aide au contrôle de gestion et au management de l’agrumiculture au Maroc

L’étude est dédiée aux grandes entreprises agrumicoles structurées et décentralisées. Elle fournit les éléments agronomiques et financiers pour un modèle de contrôle de gestion de type bottom-up concevable à partir de l’expérience sur la nouvelle agrumiculture née du plan Maroc Vert. Le modèle suppose la transparence, un travail en partenariat fermes-contrôle de gestion, un système d’information fiable et une fluidité de circulation de l’information. En agriculture, il n’y a pas d’analogie parfaite avec l’industrie concernant l’évaluation des écarts de performance par rapport aux objectifs de gestion affichés par le budget. Dans l’industrie, les mêmes inputs et le même process produisent en général le même résultat, ce qui facilite amplement l’analyse des écarts constatés et aide beaucoup à proposer des mesures correctives. En agriculture, avec une même quantité d’inputs (eau, engrais, pesticides), et un même process de production (porte greffe, variété, densité, taille), le résultat peut être très différent selon l’année climatique, la région ou le type de sol. Par conséquent, le plus important dans cette activité, n’est pas l’écart de performance lui-même, mais de pouvoir expliquer la part de cet écart qui revient à la gestion et celle due aux facteurs externes non maitrisables du milieu. Une contre-performance sur la productivité ou la qualité peut être la conséquence d’effets pervers d’un Chergui (chute des fruits, marbrures, coup de soleil) alors qu’aucune modification n’a été apportée au process usuel de production. De même qu’une excellente performance est parfois en partie le fait d’une année climatique favorable et d’un bon prix sur le marché et non d’un effort particulier de gestion. Cette énorme difficulté à prévoir avec une certaine confiance, ce que sera le comportement du verger d’une année à l’autre, rend donc malaisé l’usage de « normes » figées pour le contrôle de gestion. C’est pourquoi dans la présente étude, l’effort a plus porté sur l’exploration des causes des écarts autour des chiffres moyens que sur les chiffres eux-mêmes. Au Maroc, on est en présence d’un système économique libéral certes, mais la surproduction avec l’idée d’ensuite vendre les agrumes « a dime a dozen » ou de laisser la main invisible d’Adam Smith réguler le marché n’a jamais été un objectif du plan Maroc Vert. Le but recherché, est plutôt de produire pour ensuite exporter davantage afin d’améliorer la balance commerciale du pays. Aujourd’hui, on est en situation d’offre excessive en petits fruits aggravée par un Export qui peine à monter en charge, il est donc légitime que chacun cherche à tirer son épingle du jeu. Faute de pouvoir agir sur les prix, la mission basique du contrôle de gestion est donc de maîtriser au moins les charges. Même si la vraie solution pour le Maroc, aurait été plutôt d’instaurer un super-contrôle de gestion innovant de type filière avec notamment des prérogatives de gel provisoire des plantations, le temps de conquérir de nouveaux marchés. Ce que nous craignions est maintenant arrivé en 2018, c'est-à-dire finir après autant d’investissements par vendre la clémentine de qualité sur le marché local à 10cts/kg. L’étude suggère entre autres, comment sortir de cette période trouble et surmonter la crise avec un minimum de dégâts pour le producteur. Mots clés : Contrôle de gestion, agrumes, MarocThe study concerns the large structured and decentralized citrus fruit companies. It provides the agronomic and financial tools for management control. The present management model is based on a bottom-up design. It is inspired from the new citrus cropping experience born from the Green Morocco plan. The model assumes transparency, farm and management control partnership, reliable information system and fluidity of information. In agriculture, there is no perfect analogy with the industry sector concerning the assessment of performance gaps compared to the management objectives reported by the budget. In industry, the same inputs combined to the same process generally produce the same result. Thus, the analysis of the observed performance gaps become easier and corrective measures can be suggested. In agriculture, the result can’t be similar even the same amount of inputs (water, fertilizer, pesticides), and the same production process (rootstock, cultivar, density, pruning) have been used. This situation is related to climatic year, location and soil type. Therefore, the most important in agricultural activity, is to explain the causes of the performance gap. Then, to classify these causes into manageable factors and not manageable factors of the environment. A low performance on productivity or quality can be related to the negative effect of “Chergui” wind (fall, physical damage, sunburn, ...) even we keep the same usual production process. Also, an excellent performance is sometimes related to a very good climate year and not to a specific management effort. The enormous difficulty of predicting confidently the orchard behavior, for each year, constrains the establishment of fixed "standards" useful for management control. Thus, in the present study, we try to explore causes of deviations around average numbers. In Morocco, a liberal economy is established. However, the overproduction with the idea of selling the citrus fruit as dime a dozen or leaving the Adam Smith invisible hand regulates the market has never been the goal of the Green Morocco Plan. Such plan aims to produce and to export more in order to improve the country's trade balance. Today, we are in a situation of excessive clementine supply aggravated by the difficulty to increase export quantity. This situation pushes each producer to perform well. Regarding the difficulty to regulate prices, the basic mission of the management control is to master at least the production costs. The true solution would to introduce an innovative super-control management of citrus sector. This management would include a provisional plantation freezing waiting for finding new markets. In fact, the feared problem is occurred in 2018. Indeed, high quality clementine has been sold at 10 cts kg-1. on the local market after many investments of the producer. The study aims to give suggestions to producers on how to manage this troubled period and overcome the crisis with minimal damage. Key words: Management control, citrus fruits, Morocc

Modeling, Evaluation, and Scale on Artificial Pedestrians: A Literature Review

Modeling pedestrian dynamics and their implementation in a computer are challenging and important issues in the knowledge areas of transportation and computer simulation. The aim of this article is to provide a bibliographic outlook so that the reader may have quick access to the most relevant works related to this problem. We have used three main axes to organize the article's contents: pedestrian models, validation techniques, and multiscale approaches. The backbone of this work is the classification of existing pedestrian models; we have organized the works in the literature under five categories, according to the techniques used for implementing the operational level in each pedestrian model. Then the main existing validation methods, oriented to evaluate the behavioral quality of the simulation systems, are reviewed. Furthermore, we review the key issues that arise when facing multiscale pedestrian modeling, where we first focus on the behavioral scale (combinations of micro and macro pedestrian models) and second on the scale size (from individuals to crowds). The article begins by introducing the main characteristics of walking dynamics and its analysis tools and concludes with a discussion about the contributions that different knowledge fields can make in the near future to this exciting area