Search results for " ground"

showing 10 items of 229 documents

La denitrificazione biologica delle acque di falda: studio di tre differenti substrati organici

2015

L’uso massiccio di fertilizzanti contenenti azoto è causa dei fenomeni di inquinamento diffuso delle acque di falda. In tale ottica, notevole interesse hanno recentemente riscosso i trattamenti biologici in situ, in grado di promuovere la denitrificazione delle acque di falda mediante la realizzazione di interventi che coniugano efficacia di rimozione e costi relativamente contenuti. Nella nota si riportano i risultati di una ricerca sul processo di denitrificazione eterotrofa, condotta utilizzando come fonte di carbonio tre materiali convenzionalmente considerati di scarto: corteccia di pino, sughero e sansa di olive. Lo studio è stato suddiviso in due fasi: la prima condotta in modalità b…

Settore ICAR/03 - Ingegneria Sanitaria-Ambientaledenitrificazione biologica in situ biobarriere PRB rilascio carbonio organico inquinamento acque di falda.in situ biological groundwater denitrification biobarriers PRB organic carbon release groundwater pollution.
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Nonlinear Response of RC Structures: Statistical Effects of Artificial Ground Motions

2020

The selection of seismic inputs for nonlinear dynamic analysis is widely debated, mainly focusing on the advantages and disadvantages provided by the choice of natural, simulated or artificial records. However, most of the available technical codes do not provide always the same suggestions and well-defined procedures for the generation of artificial ground motions. Considering that the strategy of the generation of accelerograms makes some doubts raise about the possible effect on the structural response, the work aims to investigate on the differences of the structural behavior by using accelerograms nominally equivalent but different in terms of stationarity. This paper presents a compar…

Settore ICAR/09 - Tecnica Delle CostruzioniAccelerationNonlinear systemNonlinear dynamic analysis Artificial ground motions Incremental dynamic analysis Fragility curves Reinforced concrete structures.business.industryComputer scienceWork (physics)Structure (category theory)Point (geometry)Structural engineeringbusinessReinforced concreteIncremental Dynamic Analysis
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Giuseppe Samonà e la “spina dorsale” di Gibellina Nuova

2020

Nel 1970 Giuseppe Samonà coordina il gruppo di progettazione formato da Vittorio Gregotti, Gianni Pirrone e Alberto Samonà per il Progetto del Centro civico, commerciale e culturale di Gibellina Nuova. Del piano è realizzato il municipio e poi, rielaborato e in altro luogo, il teatro. I monumenti, fondati su un asse pedonale in quota connesso a un suolo artificiale articolato, esprimono l’unità architettura – urbanistica e anticipano, per certi versi, una riflessione successiva del Direttore dello IUAV sulla dialettica fra urbano e rurale.

Settore ICAR/14 - Composizione Architettonica E UrbanaIn 1970 Giuseppe Samonà coordinated a design team (with Vittorio Gregotti Gianni Pirrone and Alberto Samonà) for the project of the Civic Commercial and Cultural Centre of Gibellina Nuova. From this plan among the monuments just the town hall was built. The theatre was proposed later for a different place. The buildings should have been linked to a pedestrian axial gangway connected to an articulated artificial ground. The complex should have shown the unity between architecture and urban planning anticipating in some ways a later Samona’s reflection about the dialectic between urban and rural.
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Life cycle analysis of innovative building materials based on circular coffee ground supply chain

2022

The construction sector is widely recognized as one of the most polluting mainly due to its intensive exploitation of natural resources and large energy consumption to produce traditional building materials. In the last years, alternative building materials have been developed with the aim to reduce the environmental burden of this sector. In particular, the use of geopolymer mortars as alternative cementitious materials is gaining increasing acceptance among scientists. Numerous laboratory studies demonstrate their suitability for construction applications, highlighting the potential environmental benefits that can be obtained from their large-scale production. This study aims to perform a…

Settore ING-IND/17 - Impianti Industriali MeccaniciGeneral MedicineCircular economy Food waste Life Cycle Assessment Spent Coffee Ground
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Android tool to evaluate grounding resistance

2015

In the absence of sources of rapidly varying field, the study of the potential distribution determined, in a linear medium, by a geometrically complex grounding may be conducted by applying the method of superposition of the effects, known as method of subareas of Maxwell. Such approach can be usefully employed in an educational tool intended for students of electrical engineering.

Settore ING-IND/31 - ElettrotecnicaEngineeringSuperposition principleGroundbusiness.industryLightning groundingControl engineeringAndroid (operating system)businessHumanoid robotSimulationGrounding resistanceLinear medium2015 IEEE International Telecommunications Energy Conference (INTELEC)
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Ground Fault Current Distribution in Substations Supplied by Nonuniform Multi-Section Lines

2007

he paper presents a general method for computing the distribution of substation ground fault current. The feeding line can be entirely homogeneous along its whole length or consisting of two or more different sections, i.e. part overhead and part underground cable. Based on the two-port theory, the proposed method allows to take into account all the relevant conductively and inductively coupled parameters which take part to the distribution of the fault current and can be easily implemented in a computer program. Numerical examples demonstrate the high efficiency of the proposed method.

Settore ING-IND/33 - Sistemi Elettrici Per L'EnergiaGrounding ground fault current fault application transfer.
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Practical tables for the design of the grounding systems in distribution networks in presence of metallic interconnection

2009

The present paper deals with the dependence of the ground current, due to a single-line-to-ground fault in a secondary substation, on the electrical and geometrical parameters of a Medium Voltage distribution network in which a metallic interconnection between the grounding systems is realized. Examining different situations, some easy-to-use tables are provided for a practical approach to the design of the ground electrodes of the secondary substations in these networks. The relevance of the work is due to the lack in the international standards of specific indications on how to consider the presence of the interconnection elements in distribution networks.

Settore ING-IND/33 - Sistemi Elettrici Per L'EnergiaInterconnection Ground Fault Grounding Systems
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Guidelines and Conceptual Design of the Grounding System of the DTT Experimental Facility

2022

The Divertor Tokamak Test (DTT) is an experimental nuclear fusion reactor currently under construction at the ENEA research center in Frascati and whose first plasma is expected in 2025. The present article shows the conceptual philosophy and the guidelines behind the design of the grounding system of the DTT. The article focuses on the main target of the grounding system and on the main technical standards to refer to for the design.

Settore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/32DTT grounding lightning protectionSettore ING-IND/31 - ElettrotecnicaSettore ING-IND/312022 IEEE 21st Mediterranean Electrotechnical Conference (MELECON)
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Rateless Codes Performance Analysis in Correlated Channel Model for GEO Free Space Optics Downlinks

2012

Settore ING-INF/03 - TelecomunicazioniFree Space Optics (FSO) technologies for satellite communications offer several advantages: wide bandwidth high rate capability immunity to electromagnetic interference and small equipment size. Thus they are suitable for inter-satellite links deep space communications and also for high data rate ground-to-satellite/satellite-to-ground communications. Nevertheless FSO links suffer impairments that cause power signal degradation at the receiver. Scattering and absorption cause power signal attenuations predictable by suitable deterministic models. Optical turbulence causes random irradiance fluctuations which can generate signal fading events and can thereby only be predicted by statistical models. Attenuation and fading events can corrupt FSO links and so it would be recommended to add mitigation error codes on the communication link. FSO channel can be described as an erasure channel: fading events can cause erasure errors. We have identified in rateless codes (RCs) a suitable solution to be employed in FSO links. RCs do not need feedback and they add a redundant coding on the source data that allows the receiver to recover the whole payload despite erasure errors. We implemented two different of rateless codes: Luby Transform (LT) and Raptor. We analyzed their performances on a simulated turbulent GEO FSO downlink (1 Gbps - OOK modulation) at a 106 μm wavelength and for different values of zenith angles. Assuming a plane-wave propagation and employing Hufnagel-Valley we modeled the downlink using: 1) a temporal correlated channel model based on Gamma-Gamma probability distribution and 2) an irradiance covariance function that we converted on a time function using Taylor frozen eddies hypothesis. Our new channel model is able to simulate irradiance fluctuations at different turbulence conditions as it will be shown in the full paper. We will also report performance results of LT and Raptor codes at overhead range varying between 0 and 50% and for different values of source packets.Settore ING-INF/01 - Elettronica
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Grounding concepts as emerging clusters in multiple conceptual spaces

2018

A novel framework for symbol grounding in artificial agents is presented, which relies on the key idea that concepts "emerge" implicitly at the perceptual level as clusters of points with similar features forming homogeneous regions in multiple perceptual Conceptual Spaces (pCS). Such spaces describe percepts such as color, texture, shape, and position that in turn are the properties of the objects populating the agent's environment. Objects are represented in a suitable object Conceptual Space where all their features are composed together again using clustering in pCSs. Symbols will be learned from such a tensor space. A detailed description of both the framework and its theoretical found…

Settore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniConceptual SpaceTensorComputer Science (all)Symbol GroundingClustering
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