Search results for " Misure"
showing 10 items of 421 documents
Gamma-ray irradiation tests of CMOS sensors used in imaging techniques
2014
Technologically-enhanced electronic image sensors are used in various fields as diagnostic techniques in medicine or space applications. In the latter case the devices can be exposed to intense radiation fluxes over time which may impair the functioning of the same equipment. In this paper we report the results of gamma-ray irradiation tests on CMOS image sensors simulating the space radiation over a long time period. Gamma-ray irradiation tests were car ried out by means of IGS-3 gamma irradiation facility of Palermo Uni ver sity, based on 60Co sources with dif fer ent ac tiv i ties. To re duce the dose rate and re al ize a nar row gamma-ray beam, a lead-collimation sys tem was pur posely …
Incremental heuristic approach for meter placement in radial distribution systems
2019
The evolution of modern power distribution systems into smart grids requires the development of dedicated state estimation (SE) algorithms for real-time identification of the overall system state variables. This paper proposes a strategy to evaluate the minimum number and best position of power injection meters in radial distribution systems for SE purposes. Measurement points are identified with the aim of reducing uncertainty in branch power flow estimations. An incremental heuristic meter placement (IHMP) approach is proposed to select the locations and total number of power measurements. The meter placement procedure was implemented for a backward/forward load flow algorithm proposed by…
Uncertainty evaluation in the differential measurements of power losses in a power drive system
2021
Abstract In order to guarantee a correct classification in the standardized energy efficiency classes, the current standards concerning the power drive systems prescribe that their power losses must be evaluated with great accuracy. This circumstance involves the usage of expensive measurement systems, since accurate instrumentation, skilled personnel and controlled environments are required. During the design stage of a power drive system, however, the measurement of the absolute value of its power losses is not always needed. Often, in fact, it is enough to assess the power losses variations caused by a modification of either hardware or software sections of the power drive system. In the…
On the methodologies for the calibration of static electricity meters in the presence of harmonic distortion
2010
This paper is focused on the problems related to the calibration of static electricity meters with nonsinusoidal test waveforms. This is an up-to-date issue since the harmonic distortion levels are ever increasing, especially in low-voltage power systems, and in such conditions the performances of the modern static electricity meters can be negatively affected, depending on the implemented measurement algorithm. Thus it is important to test the meters with nonsinusoidal waveforms. The paper analyzes the problems related to both the choice of the test signals to be used for calibration and the implemented metric, with a particular focus on the reactive energy meters. The analysis is supporte…
Measurement Uncertainty of Harmonic Emission Indicators based on IEEE Std. 1459-2010
2020
The study presented in this paper is aimed at analyzing the measurement uncertainty impact on the evaluation of some power ratio parameters for harmonic emissions assessment based on IEEE Std. 1459-2010 apparent power decomposition. In addition to power factors for line utilization and harmonic pollution levels evaluation defined in the Standard, the study covers also some new parameters, which have been introduced by the authors as IEEE Std. 1459-2010 power quantities ratios. The measurement of the aforesaid parameters is implemented on a PC-based wattmeter, in order to investigate the measurement uncertainty impact on the evaluation of the power ratios. The obtained results show that, in …
Analysis of radionuclide concentration in air released through the stack of a radiopharmaceutical production facility
2014
The quantities of positron emitting radionuclides used in medical diagnostics and the number of radiopharmaceutical production facilities have been estimated to be growing worldwide. In this field, an amount of these radionuclides might become airborne and escape into the environment during the process of production and/or during administration by hospital personnel. Therefore, the analysis of dose to the operating staff as well as to the public, due to releases through the stack, is a very important issue. To this end, sampling and measurement of radionuclide concentration in air released through the stack of a Nuclear Medicine Center (NMC), provided with a cyclotron for radiopharmaceutica…
Realizzazione di un banco di misura e di un modello in Simulink per la ricerca e la caratterizzazione di reti di accoppiamento per la trasmissione di…
2010
Campagna di misure sulla rete elettrica dell’isola di Favignana per la caratterizzazione di reti di accoppiamento per la trasmissione di segnali su c…
2010
La "carcerazione degli infanti" nella lettura della Corte costituzionale
2015
Nota a Corte cost., 22 ottobre 2014, n. 239. Con la sentenza appena richiamata la Corte costituzionale dichiara l’illegittimità costituzionale dell’art. 4 bis, comma 1, della legge 26 luglio 1975, n. 354, in riferimento agli artt. 3, 29, 30 e 31 della Costituzione, nella parte in cui non esclude dal divieto di concessione dei benefici penitenziari la misura della detenzione domiciliare speciale, prevista dall’art. 47 quinquies della legge 26 luglio 1975, n. 354, e la misura della detenzione domiciliare, disciplinata dall’art. 47 ter, comma 1, lett. a) e b), della medesima legge.
Valutazione dell’andamento del fondo continuo in uno spettro gamma complesso per la determinazione dei limiti di rivelazione
2022
Nella valutazione della minima attività rivelabile (MDA, minimum detectable activity) per dato radionuclide in uno spettro gamma complesso, la determinazione dei conteggi di fondo da considerare nelle computazioni viene, a volte, complicata dalla presenza di molti picchi fotoelettrici che rendono l’andamento del fondo continuo estremamente variabile per i molteplici effetti di dispersione e fattori di interferenza. Ne consegue che la valutazione di MDA deve essere effettuata dopo l’analisi complessiva dello spettro gamma, per tenere conto dei contributi di tutte le emissioni gamma dei radionuclidi presenti in un dato campione. Per emissioni gamma di debole intensità, che non sono identifica…