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GIS Education and Research at E tv s Loránd University, Faculty of Informatics
Roberto Giachetta,István László,István Elek,István Fekete
Agrárinformatika Folyóirat , 2011,
Abstract: In past years, geographical information systems have undergone spectacular development. Beside traditional applications some new areas have been opened by the spreading of navigation systems and the publication of geoinformation via Internet. Software products supporting geoinformatics have also undergone tremendous development. The paradigm shift should be followed by the education of professionals. This article presents several educational and research results achieved at ELTE Faculty of Informatics, supported by institutional cooperation. In 2004, one year after the Faculty had been established, the Geoinformatics educational module started as a part of software engineering education at master level. Up to now, more than 400 students have completed the module. In parallel with education, research has started as well. Its topics include the development of University Digital Map Library (EDIT), automatic raster-vector conversion of maps, and the development of an open source GIS framework called AEGIS. Another field of research, the segment-based evaluation of remote sensing images is carried out in cooperation with the Institute of Geodesy, Cartography and Remote Sensing. The theoretical results obtained were formerly used only in the thematic mapping of land cover. However, the methods investigated recently appeared in three novel applications. Beyond giving presentations in subject Analysis of Remote Sensing Images within the Geoinformatics educational module, the researchers of F MI provide the possibility to students to complete their professional practice in the Institute.
Solar retrofitting in social housing: a case study in Savona
Andrea Giachetta
Techne : Journal of Technology for Architecture and Environment , 2012,
Abstract: In relation to the social Housing’s theme, sustainable requalification interventions on the building heritage in the urban fringes dating back to the WWII postwar play an important role as those are characterized by buildings which offer poor energy performances. These interventions are potentially very effective, although at the same time they raise implementation and management issues, with which it is fundamental to confront, with a view to pursue serious housing and social policies. With this object in view, the introduction of a recently completed intervention in a social housing borough in Savona, also through the use of passive solar systems, offers suggestions and hints for reflection, due to the repeatibility of some adopted solutions and design principles.
Project for a renewable energy research centre
Andrea Giachetta
Techne : Journal of Technology for Architecture and Environment , 2011,
Abstract: In Liguria, where sustainable approaches to the design, construction and management of buildings enjoy scant currency, the idea of a company from Milan (FERA s.r.l.) setting up a research centre for studies into renewable energy resources, could well open up very interesting development opportunities. The project includes: environmental rehabilitation (restoration) projects; strategies for the protection of water resources and waste management systems; passive and active solar systems (solar thermal and experiments with thermodynamic solar energy); hyperinsulation systems, passive cooling of buildings; use of natural materials; bio-climatic use of vegetation. The author describes the project content within the context of the multidisciplinary work that has gone into it.
Diffusion of Sustainable Construction Practices. A Case of International Cooperation  [PDF]
Andrea Giachetta, Katia Perini, Adriano Magliocco
Open Journal of Energy Efficiency (OJEE) , 2013, DOI: 10.4236/ojee.2013.21008
Abstract: Data shows that buildings play an important role in the field of energy efficiency and environmental sustainability. The exchange of information among different countries is a key element to promote a wider diffusion of practices for sustainable development in the fields of architecture and urban planning, contributing to the improvement of new skills and economic and production activities, while also reducing the environmental impact of construction on the territory. An international cooperation can lead an exchange of experiences and practices, which could play a fundamental role since countries can have similar problems to deal with, as it happens for the specific identity of the Mediterranean territory in coastal and rural areas. This paper analyses a case of international cooperation, the project SCORE, “Sustainable COnstruction in Rural and fragile areas for energy Efficiency”, financed under the European MED Programme with the purpose to promote sustainable energy policies in the construction sector on fragile coastal and rural Mediterranean areas.
Stress-Energy-Momentum of Affine-Metric Gravity. Generalized Komar Superportential
G. Giachetta,G. Sardanashvily
Physics , 1995, DOI: 10.1088/0264-9381/13/6/001
Abstract: In case of the Einstein's gravitation theory and its first order Palatini reformulation, the stress-energy-momentum of gravity has been proved to reduce to the Komar superpotential. We generalize this result to the affine-metric theory of gravity in case of general connections and arbitrary Lagrangian densities invariant under general covariant transformations. In this case, the stress-energy-momentum of gravity comes to the generalized Komar superpotential depending on a Lagrangian density in a precise way.
Dirac Equation in Gauge and Affine-Metric Gravitation Theories
G. Giachetta,G. Sardanashvily
Physics , 1995,
Abstract: We show that the covariant derivative of Dirac fermion fields in the presence of a general linear connection on a world manifold is universal for Einstein's, gauge and affine-metric gravitation theories.
Stress-Energy-Momentum Tensors in Lagrangian Field Theory. Part 2. Gravitational Superpotential
G. Giachetta,G. Sardanashvily
Physics , 1995,
Abstract: Our investigation of differential conservation laws in Lagrangian field theory is based on the first variational formula which provides the canonical decomposition of the Lie derivative of a Lagrangian density by a projectable vector field on a bundle (Part 1: gr-qc/9510061). If a Lagrangian density is invariant under a certain class of bundle isomorphisms, its Lie derivative by the associated vector fields vanishes and the corresponding differential conservation laws take place. If these vector fields depend on derivatives of parameters of bundle transformations, the conserved current reduces to a superpotential. This Part of the work is devoted to gravitational superpotentials. The invariance of a gravitational Lagrangian density under general covariant transformations leads to the stress-energy-momentum conservation law where the energy-momentum flow of gravity reduces to the corresponding generalized Komar superpotential. The associated energy-momentum (pseudo) tensor can be defined and calculated on solutions of metric and affine-metric gravitational models.
Stress-Energy-Momentum Tensors in Lagrangian Field Theory. Part 1. Superpotentials
G. Giachetta,G. Sardanashvily
Physics , 1995,
Abstract: Differential conservation laws in Lagrangian field theory are usually related to symmetries of a Lagrangian density and are obtained if the Lie derivative of a Lagrangian density by a certain class of vector fields on a fiber bundle vanishes. However, only two field models meet this property in fact. In gauge theory of exact internal symmetries, the Lie derivative by vertical vector fields corresponding to gauge transformations is equal to zero. The corresponding N\"oether current is reduced to a superpotential that provides invariance of the N\"oether conservation law under gauge transformations. In the gravitation theory, we meet the phenomenon of "hidden energy". Only the superpotential part of energy-momentum of gravity and matter is observed when the general covariant transformations are exact. Other parts of energy-momentum display themselves if the invariance under general covariance transformations is broken, e.g., by a background world metric. In this case, the Lie derivatives of Lagrangian densities by vector fields which call into play the stress-energy-momentum tensors fail to be equal to zero in general. We base our analysis of differential conservation laws on the canonical decomposition of the Lie derivative of a Lagrangian density $L$ by a projectable vector field on a bundle and with respect to different Lepagian equivalents of $L$. Different Lepagian equivalents lead to conserved quantities which differ from each other in superpotential terms. We have different stress-energy-momentum tensors depending on different lifts of vector fields on a base onto a bundle. Moreover, different solutions of the same Euler-Lagrange equations may require different energy-momentum tensors. We show that different stress-energy-momentum tensors differ from each other in N\"oether currents. As
What is geometry in quantum theory
G. Sardanashvily,G. Giachetta
Physics , 2004,
Abstract: In this scientific preface to the first issue of International Journal of Geometric Methods in Modern Physics, we briefly survey some peculiarities of geometric techniques in quantum models.
Advanced Mechanics. Mathematical Introduction
G. Giachetta,L. Mangiarotti,G. Sardanashvily
Physics , 2009,
Abstract: Classical non-relativistic mechanics in a general setting of time-dependent transformations and reference frame changes is formulated in the terms of fibre bundles over the time-axis R. Connections on fibre bundles are the main ingredient in this formulation of mechanics which thus is covariant under reference frame transformations. The basic notions of a non-relativistic reference frame, a relative velocity, a free motion equation, a relative acceleration, an external force are formulated. Newtonian, Lagrangian, Hamiltonian mechanical systems and the relations between them are defined. Lagrangian and Hamiltonian conservation laws are considered.
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