Search results for "stations"
showing 10 items of 159 documents
Legal Liability of Professional Engineers: The Case of a Fire at a Shopping Center
2019
In this paper, the authors discuss the legal liabilities of the professional engineer as both the engineer of record of a project and the construction site manager. In particular, this paper analyzes the case of a fire at an end-user MV/LV substation of a shopping center in Italy, occurred a few years after maintenance works on the electrical installation. The professional engineer who had designed and overseen the construction of the substation was accused of criminal negligence. The authors through the examination of applicable technical standards, as well as of safety regulations, demonstrate that the professional engineer had acted diligently and that there was no ground for the neglige…
Ground-Fault Current Transfer at the Transition Station of a Combined Overhead-Cable Line. A Parametric Analysis
2007
When a substation is fed by a combined overhead-cable transmission line, a significant part of the ground fault current flows through the grounded cable sheaths and discharges into the earth at the transition station, where cables are connected to the overhead line. If the transition station is a dead-end steel pole structure, the local ground electrode, small and of high resistance, could be inadequate to maintain the ground potential rise within safety limits in case of a fault to ground at the receiving end substation. Based on a circuit model approach, the paper presents a parametric analysis of the fault current distribution between the faulted substation and the transition station, ta…
Vers une européanisation du syndicalisme français ?
2013
International audience; Si l'espace syndical demeure encore largement national, la construction européenne, la mondialisation et son cortège de restructurations, la crise mondiale de 2008, puis celle de l'euro, et les réformes institutionnelles de l'Union européenne ne peuvent pas laisser les confédérations syndicales indifférentes. Elles s'efforcent donc d'investir, ou de réinvestir, le syndicalisme européen, de peser sur certaines décisions, de se mobiliser - pour certaines d'entre elles - contre de nouveaux traités (comme à l'occasion du Traité établissant une constitution pour l'Europe) ou sur diverses thématiques sociales (notamment au moyen d'euomanifestations). Ce chapitre aborde ces…
Fall of Potential Measurement of the Earth Resistance in Urban Environments: Accuracy Evaluation
2019
Both Standards EN 50522 and IEEE 81 propose the fall of potential method (FPM) to carry out the measurement of the resistance to earth ( $R_{\text{ES}}$ ) of an earthing system (ES). However, in urban areas, the recommended distances between the ES and auxiliary electrodes are not easy to respect, due to the presence of buildings and tarmac. Furthermore, unknown buried metallic parts and interconnections among ESs could modify the earth potential profile of the area, affecting the measurement results. In this paper, the key-issues that influence the measured $R_{\text{ES}}$ when the FPM is used in an urban environment are presented. A parametric analysis, carried out with Comsol Multiphysic…
Aggregation ofArgulus coregoni(Crustacea: Branchiura) on rainbow trout (Oncorhynchus mykiss): a consequence of host susceptibility or exposure?
2005
By sampling individual rainbow trout,Oncorhynchus mykiss, at a fish farm we showed thatArgulus coregoniwere aggregated within their host population. The relative significance of susceptibility and exposure generating the observed pattern was tested using experimental infections. We examined, whether rainbow trout developed protective resistance mechanisms against the louse following a challenge infection and if there was variation between individual trout in their susceptibility toA. coregonimetanauplii. Fish were exposed to 20A. coregonifor 5, 25, 50, 85 or 120 min and the numbers attaching recorded. Three weeks later, developing argulids were removed and the experiment repeated with a sta…
Seasonal dynamics of egg laying and egg-laying strategy of the ectoparasite Argulus coregoni (Crustacea: Branchiura).
2004
Substrate preferences, spatial aggregation patterns and seasonal dynamics in the egg laying of ectoparasiticArgulus coregoniwere studied at a commercial fish farm in Finland. Pilot experiments showed thatA. coregonifemales selected specific types of substrates for egg laying. Significantly moreA. coregonieggs were laid on dark substrates than on light ones suggesting the use of visual cues. Therefore, egg-laying plates of dark colour were constructed for further experiments. MostA. coregonieggs were deposited in locations in shadow and in the deepest water in a 2 m deep farming canal. Relatively more eggs were laid on bottom stones situated near each egg-laying trap than on artificial egg-l…
A new approach for an adaptive forest management planning to improve resilience of beech forests in relation to climate change: the LIFE AForClimate …
2019
ORAL MANIFESTATIONS IN GASTROESOPHAGEAL REFLUX DISEASE
2005
The gastroesophageal reflux (passage of gastric contents into the oesophagus and the mouth) is the main sign/symptom of a very frequent gastroesophageal reflux disease. Thus, acid regurgitation originates from stomach and it is responsible of the onset of tipical symptoms and mucosal injury. Also in oral cavity the noxious acid agent is able to injure oral cavity (soft and hard tissues). These involvementes are described from international literature, even if a greater interest has shown to date only for hard tissue injury.
Invenzione, composizione e tempo nell’architettura di Giuseppe Samonà; Invention, Composition and Time in the Architecture of Giuseppe Samonà
2016
Una riflessione su alcune costanti presenti nell’opera di Giuseppe Samonà deve anticipare un approfondimento dedicato esclusivamente alle centrali termiche realizzate in Sicilia dal 1955 al 1962. Si vogliono inquadrare le ragioni di alcune scelte senza per questo avere la pretesa di raggiungere un’esaustività critica rispetto alle molte questioni offerte dall’ampia produzione teorica e progettuale di Samonà. Se si osserva l’architettura di Samonà, in termini di invenzione e composizione ci si accorge come la cosiddetta “rivoluzione miracolosa”, non è una frattura ma una sorta di aggiornamento nel “già costruito” preso a riferimento. Il procedere di Samonà assoggettando frammenti e il rielab…
Rilievo ed elaborazione di dati laser acquisiti con sistemi MMS in un parco urbano
2013
Questo articolo riassume l'esperienza acquisita tra il 2012 e il 2013 dal Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale e dei Materiali dell'Università degli Studi di Palermo per l'indagine integrata del Parco Ninni Cassarà a Palermo, Italia, e la successiva sperimentazione di metodi, strumenti e tecniche basate su ricerche in corso, per quanto riguarda l'acquisizione e l'elaborazione dei dati GNSS e laser Scanner. Il lavoro è stato affrontato al fine di selezionare le tecniche meno costose e veloci da applicare in fase di acquisizione. Dopo la prima monumentazione di sedici punti di controllo distribuiti all'interno del sito e rilevati con ricevitori GNSS, la è stata pianific…