Search results for "Power"
showing 10 items of 5099 documents
On the distribution of lightning current among interconnected grounding systems in medium voltage grids
2018
This paper presents the results of a first investigation on the effects of lightning stroke on medium voltage installations' grounding systems, interconnected with the metal shields of the Medium Voltage (MV) distribution grid cables or with bare buried copper ropes. The study enables us to evaluate the distribution of the lightning current among interconnected ground electrodes in order to estimate if the interconnection, usually created to reduce ground potential rise during a single-line-to-ground fault, can give place to dangerous situations far from the installation hit by the lightning stroke. Four different case studies of direct lightning stroke are presented and discussed: (1) two …
Analysis of Lipophilic Extractives from Fast Pyrolysis Bio-Oils
2022
Fast pyrolysis bio-oils (FPBOs) originating from forest residues contain extractive-derived substances, which may form a separate, sticky layer with char particles on the surface of these bio-oils. In this study, first, the removal of extractive-derived substances from the bio-oil top phase was studied by common solvents with different polarities. In this case, the results indicated that when aimed at the maximum yield of single-phase fuel oil and thus the maximum amount of extractives removed, the use of n-heptane or n-hexane seems to be of benefit for this purpose. For safety reasons, the use of n-heptane was recommended. Second, an analysis practice (extraction time and the way of mixing…
Recent Progress in the WCLL Breeding Blanket Design for the DEMO Fusion Reactor
2018
The water-cooled lithium-lead (PbLi) breeding blanket is one of the candidate systems considered for the implementation in the European Demonstration Power Plant (DEMO) nuclear fusion reactor. This concept employs PbLi liquid metal as tritium breeder and neutron multiplier, water pressurized at 15.5 MPa as the coolant, and EUROFER as the structural material. The current design is based on the single module segment approach and follows the requirements of the DEMO-2015 baseline design. The module is constituted by a basic toroidal-radial cell that is recursively repeated along the poloidal direction where the liquid metal flows along a radial-poloidal path. The heat generated by the fusion r…
Associations between muscle strength, spirometric pulmonary function and mobility in healthy older adults
2014
Background: Pathological obstruction in lungs leads to severe decreases in muscle strength and mobility in patients suffering from chronic obstructive pulmonary disease. The purpose of this study was to investigate the interdependency between muscle strength, spirometric pulmonary functions and mobility outcomes in healthy older men and women, where skeletal muscle and pulmonary function decline without interference of overt disease. Methods: 135 69 to 81‐yr‐old participants were recruited into the cross‐sectional study, which was performed as a part of European study MyoAge. Full, partial and no mediation models were constructed to assess the interdependency between muscle strength (handgr…
L’impresa mafiosa? Colletti bianchi e crimini di potere
2016
Assumendo una prospettiva multidisciplinare e partendo dai risultati di una ricerca condotta sul campo tra il 2013 e il 2015, il volume esamina il complesso network delle relazioni interne ed esterne a due gruppi di imprese sequestrate e confiscate per infiltrazioni mafiose, osservandone i cambiamenti negli aspetti economici, finanziari, organizzativi e sociali sia nel periodo che precede il sequestro o la confisca, sia nel periodo in cui il provvedimento è in corso. L’elevato dinamismo che caratterizza i crimini messi in atto dagli imprenditori coinvolti e il contesto in cui avvengono rendono assimilabili, sotto molti punti di vista, i casi considerati alla cosiddetta criminalità dei colle…
LA IMAGEN CONSTRUIDA DEL PODER REAL EN LA CORONA DE ARAGÓN (SIGLOS XIII-XV): CASAS, CEREMONIAL Y MAGNIFICENCIA
2007
Command and obedience do not exist without emotional forms of shaping control. This is especially notable in the Kingdom of Aragon, since the heterogeneity of its territories was not only unified through the titles of the royal family, but the ceremonials, the aesthetic simplicity and balance of the buildings formed the charismatic ostentation of a command that demonstrated its power through the prizes seized from the enemy, the stately architectural forms and the civil rites of recognition. No existe el mando y obediencia sin formas sentimentales de conformar dominio. Esto es especialmente notable en el Reino de Aragón, pues la heterogeneidad de sus territorios, no sólo se unificaba median…
Molecular dynamics simulations of heavy ion induced defects in SiC Schottky diodes
2018
Heavy ion irradiation increases the leakage current in reverse-biased SiC Schottky diodes. This letter demonstrates, via molecular dynamics simulations, that a combination of bias and ion-deposited energy is required to produce the degradation. Peer reviewed
Modeling biomass char gasification kinetics for improving prediction of carbon conversion in a fluidized bed gasifier
2014
Gasification of biomass in a fluidized bed (FB) was modeled based on kinetic data obtained from previously conducted thermo- gravimetic analysis. The thermogravimetric analysis experiments were designed to closely resemble conditions in a real FB gasifier by using high sample heating rates, in situ devolatilization and gas atmospheres of H 2 O / H 2 and CO 2 / CO mixtures. Several char kinetic models were evaluated based on their ability to predict char conversion based on the thermogravimetric data. A modified version of the random pore model was shown to provide good fitting of the char reactivity and suitability for use in a reactor model. An updated FB reactor model which incorporates t…
Molecular dynamics simulations of heavy ion induced defects in SiC Schottky diodes
2018
Heavy ion irradiation increases the leakage current in reverse-biased SiC Schottky diodes. This work demonstrates, via molecular dynamics simulations, that a combination of bias and ion-deposited energy is required to produce the degradation peerReviewed
Perceived Retaliation Against Internal Whistleblowers: Evidence From Public Institutions in Sub-Saharan Africa
2014
The study uses power relations theory to investigate existence of perceived retaliation against internal whistleblowers in Sub-Saharan Africa using evidence from employees in public institutions of Kenya. Focus was on the way perceived retaliation is related to seriousness of wrongdoing, whistleblower psychological power and management support to whistleblowers. The research design was quantitative, exploratory and analytical using cross-sectional data. Respondents were selected using simple random sampling and requested to complete a self-administered questionnaire. Findings were that perceived retaliation against whistleblowers exists and it was positively correlated to position of a wron…