47 research outputs found
Les Structures Spatiales de l'Est Algérien. Les maillages territoriaux, urbains et routiers.
No full textThe regional analysis is an investigation very complex due to the definition that, a region consists on some irregular and complicated parameters which are sometimes visible and other time invisible, and also mobile or immobile but in continuous and interdependent relation. Gathering all the spatial components is almost impossible, however a consideration should be taken towards some factors that are essential and decided. These lead to emphasise on some principal split up and spread out characterising any site or region.One of the main aims of this study is to define or to find out for an approch between the previous spatial confirmation and the actual one, across the oriental part of Algeria or "Eastern Algeria".Based on three types of meshs or networks, which are scaled as follow:+ The region or site with its equivalent "wilaya or communes in the algerian administrative way;+ The urban netmork;+ The netmork system of communication or connection including rail-tramways...Every type of these systems has been submitted to a dtailed study and evolution, starting from almost the antic time until the present. Results have led to a typical system of configuration, which has been correlated to some theorotical models by using some modern tools of investigation.As a result, we found that what ever is a system of meshs or netmork taken in consideration, the eastern part of Algeria "Est Algérien" has demonstrated a typical exemple of a space which present some distinguishable shappes opposite to each other, whatever is the used method. Conséquently, we concluded that the region "Est Algérien" is dominated by two combined or coupled spatial systems:+ A classical and traditionnel system, characterising the marginal areas (oocidental part off the Tell, south part of the hight lands "hauts plateaux", the Nememcha area, the Hodna basin and the Saharien Atlas) show most of the time a delay up and a split up concerning differents fields;+ Owning to the colonial power, another system has been created or noticed; it concerns the linear polarisation along the main systems of communication.Consequently, in fact the model is concerned with an anisotropic area presenting a succession of forms which are gratuated in polarised pseudo-areas located arround the essential civic centers (centres urbains) and well connected by the presence of communication ways along a preferential axis. Moreover on each part of this main system, some spatial pseudo-systems have been subsisted and lasted.L'analyse régionale est une investigation délicate puisqu'une région est un ensemble hétéroclite et complexe d'invariants et de paramètres, visibles ou invisibles, mobiles ou inertes, en relation continue et interdépendante. Cerner toutes les composantes spatiales d'une région donnée est presque du domaine de l'impossible; seulement, il faut que les facteurs pris en considération soient essentiels et déterminants et permettent donc de mettre en relief les principaux écarts et décalages qui caractérisent une région quelconque.C'est ainsi que l'objectif qui a déterminé la démarche de notre étude a été d'essayer de dépeindre la configuration spatiale antérieure et actuelle de l'Algérie à travers sa partie orientale qui est "l'Est Algérien". Pour tenter d'y parvenir, nous avons pris en considération trois types de maillages qui sont les territoires (wilayas et communes), le réseau urbain (toute taille confondue) et le réseau des voies de communication avec la trame routière et le réseau ferroviaire. Pour chaque type de réseau (territoires, réseau urbain et voies de communication), il a été à chaque fois nécessaire de présenter son évolution depuis presque l'antiquité, d'étudier sa configuration actuelle puis de la confronter avec des modèles théoriques en utilisant des outils d'analyse et d'investigation mis au point dans ce contexte.Il ressort cependant que quel que soit le réseau ou le maillage pris en considération, l'Est Algérien s'est toujours montré comme un exemple typique d'un espace qui présente des formes opposées identifiables quelle que soit la méthode d'analyse utilisée. Il en résulte ainsi que la région, c'est à dire l'Est Algérien, est dominée par deux systèmes spatiaux dualistes :+ un système classique traditionnel caractérisant les régions périphériques (partie occidentale du Tell, sud des Hautes Plaines ou la Steppe, les Nememcha, la région du Hodna et l'Atlas Saharien) qui accusent souvent des retards et des décalages négatifs dans tous les domaines;+ un système spatial hérité légué principalement par le pouvoir colonial et qui se présente globalement comme une région polarisée linéairement le long des principales voies de communication en reliant les villes les plus importantes.Il s'agit en fait du modèle de la région anisotropique qui se présente sous la forme d'une succession de sous-régions polarisées autour de grands centres urbains et bien connectés par les voies de communication suivant un axe préferentiel. De part et d'autre de ce premier système hérité subsistent des sous-systèmes spatiaux marginaux
URBAN GROWTH ANALYSIS USING REMOTE SENSING AND GIS TECHNIQUES TO SUPPORT DECISION-MAKING IN ALGERIA—THE CASE OF THE CITY OF SETIF
No full textRapid urbanization in Algeria is causing significant problems, such as the emergence of unplanned neighborhoods, and local authorities need to apply modern tools like geomatics to monitor and update spatial planning databases to support sustainable development. More to the point, these tools—geographic information systems (GIS) and remote sensing (RS) are of assistance to update the spatial planning and development database so as to support the decision-making. In fact, for understanding the purpose of the process of urban growth in the region of the interior high plateaus, we chose the city of Setif as it represents an urban and economic pole in the region. Besides, economic activities exacerbate the phenomenon of rapid and unplanned urban growth alongside the environmental impact thereof. In the light of the obtained results, there exists a significant increase in urban lands and a significant decline in forests and agricultural lands, as the urban area has tripled from 10.4% in 1985 to 20.3 in 2003 and to 29.7% in 2021. At the same time, the agricultural area has then shrunk from 76.4% in 1985 to 65.8 in 2003 and to 55.5% in 2021, while the forest areas have decreased from 5.04% in 1985 to 4.4 in 2003 and to 2.3% in 2021
Correction:Experimental Study of the Impact of Folding Wingtip Devices on Aircraft Flight Mechanics and Handling Qualities (AIAA SciTech Forum and Exposition, 2023)
No full textCorrection Notice 1. One more author needs to be included to the author list: Huaiyuan Gu, Ronald Cheung, Fintan Healy, Djamel Rezgui, Mark Lowenberg, Jonathan Cooper Author(s) Affiliations: Professor of Flight Dynamics, Department of Aerospace Engineering, University of Bristol 2. Figure 9 caption needs to be changed to: Comparison of the drag curves of (a)(b) straight wing and (c)(d) swept wing with various hinge conditions. 3. Figure 11 caption needs to be changed to: Schematic representation of the shift of aerodynamic centre on the (a) straight and (b) swept wings caused by different hinge conditions. 4. Figure 23 caption needs to be changed to: Comparison of the short period damping and frequency measured from (a) straight wing model and (b) swept wing model incorporating various hinge conditions.</p
Unsupervised assignment for dynamic author name disambiguation in bibliographic citations
No full textFil: Gómez García, Carlos Andrés. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina
Unsupervised assignment for dynamic author name disambiguation in bibliographic citations
No full textFil: Gómez García, Carlos Andrés. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina
Rapid application development in the internet of things : a model-based approach
No full textThe Internet of Things (IoT) is a vision in which physical and digital objects are connected and cooperate to achieve particular goals. Unfortunately, the extent of expertise required to incorporate intelligent hardware, software, and computer network still presents a significant challenge. Service-oriented IoT middleware have been proposed quite often to solve this problem. However, they are mostly designed for professional developers with a high degree of flexibility and extensive features. Consequently, tool’s simplicity is often sacrificed, and they present a steep learning curve for entry-level developers. This dissertation aims at addressing this gap by elaborating the state-of-the-art in IoT developments and proposing IoTLink, a rapid IoT software development tool for novice developers. For designing IoTLink, the author reviewed the available IoT architectures. A typical pattern suggests that a physical object must be uniquely identifiable, has physical qualities that partly can be sensed by sensors, and has some capabilities or services that could affect the environment. Virtual entities may act as proxies to execute services and retrieving information about the physical objects. IoTLink is designed for enabling inexperienced developers to develop proxies representing domain objects and abstracting individual sensors and actuators. IoTLink design concept comprises a five layered architecture. The first layer is responsible for abstracting communication with heterogeneous data sources. The second layer deals with sensor fusion components to process and fuse sensor data into useful information. The third layer is concerned with the definitions of domain models and the concrete objects. The fourth layer provides output components, including interfaces to the application logic, distributed applications, and databases to store the information about the virtual objects. The fifth layer abstracts the application logic that access the domain objects. IoTLink employs a model driven approach for wiring these components visually. The visual model is then serialized into XML data and used to generate a Java implementation which can be executed as proxies. In addition, IoTLink offers a discovery broker allowing developers to share and discover IoT resources within the internet. The key advantage of IoTLink discovery is the ability to detect if similar devices are described with synonymous terms. This approach increases the discoverability of similar devices described with diverse terms. The author evaluated the practicability of IoTLink and model-driven approach within three distinct case studies in European research projects. The result shows that it could reduce approximately 2/3 of the development efforts. In addition, the author compared IoTLink’s usability to a Java middleware approach in a controlled experiment performed by 24 participants. The results show that IoTLink could on average reduce 44% of the development time and 48% of mistakes. Moreover, when used by developers with less than five years object-oriented experience, IoTLink was able to reduce up to 57% of mistakes compared to Java development
A proposal for a separative network to evacuate drainage waters and pluvial waters of stagnation in arid zones (Ain Sahra locality, Touggourt, Algeria)
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