Search results for "STD"
showing 10 items of 47 documents
A DAQ-based sampling wattmeter for IEEE Std. 1459-2010 powers measurements. Uncertainty evaluation in nonsinusoidal conditions
2015
Abstract This paper presents the evaluation of the metrological performances of a DAQ-based sampling wattmeter (DAQ-SW) for the measurement of IEEE Std. 1459-2010 power quantities in non-sinusoidal conditions. The instrument makes use of two commercial data acquisition (DAQ) boards, a non-inductive current shunt, a personal computer and a commercial software for data processing. Starting from the results of an experimental characterization of the two instrument channels with non-sinusoidal voltages and currents and a correlation analysis, the combined standard uncertainties of IEEE Std. 1459-2010 quantities are evaluated, following the approach of the ISO Guide to the Expression of Uncertai…
A New Measurement Method for the Detection of Harmonic Sources in Power Systems Based on the Approach of the IEEE Std. 1459–2000
2010
In this paper, a novel single-point strategy is proposed for the detection of the harmonic sources in power systems. The method is an improvement of a strategy previously proposed by the authors; it is developed from the IEEE Std 1459-2000 approach and it can be entirely implemented in the time domain, thus simplifying the measurement system. The effectiveness of the proposed method is evaluated by introducing simple decision-making rules and by taking the presence of the measurement transducers into account. Several simulations and experimental tests are presented, showing that the enhanced strategy is able to give an useful information on the detection of the dominant harmonic source upst…
La Polity Reticolare. Analisi e critica della governance come teoria
2011
Effect of Space charge accumulation inside the thermoplastic insulation of a loaded HVDC model cable
2021
The space charge accumulation phenomenon represents one of the main degradation factors for the dielectrics employed in the field of the HVDC transmission. For this reason, the recommendation IEEE Std 1732-2017 has been proposed. In that standard, due to the importance attributed at the space charge phenomenon, the experts suggest the introduction of the space charge measurement in HVDC cables during the prequalification or type tests, by means of the PEA method. However, despite for tests in flat specimens the PEA technique is well consolidated, for cable specimens difficulties are still present. In particular, the PEA cell output signal is strongly conditioned by the arranged measurement …
La stabilisation des jeunes docteurs sur le marché de l'emploi académique
2009
Modes of access to the academic career are generally regarded as crucial element of policy on science and higher education in a country. This can influence the future productivity of teaching and research in different countries. Our research is specifically concerned with the factors that may explain the conditions that lead to integration of researchers and lecturers in the academic career in France. More precisely, the paper analyses the factors affecting the access duration to a permanent job in the French academic sector. We use data from a French survey “Generation 2001”, carried out by the Cereq. We focus on a sample of 1400 individuals who obtained their PhDs in 2001 and were intervi…
Latviešu autoru darbu iestudējumi Latvijas teātros no 2006. gada līdz 2016. gadam: nacionālās identitātes diskurss
2016
Maģistra darba „Latviešu autoru darbu iestudējumi Latvijas teātros no 2006. gada līdz 2016. gadam: nacionālās identitātes diskurss” mērķis ir veikt latviešu autoru darbu teātra iestudējumu kritikas diskursa analīzi, lai noskaidrotu to, kāds nacionālās identitātes diskurss tiek atspoguļots teātra kritikā, kā arī noteikt to, kādas ir nacionālās identitātes konstrukcijas prakses teātra izrādēs. Darba teorētisko daļu veido nacionālās identitātes, diskursa teorija un postdramatiskuma teorija, kā arī ir aplūkota Latvijas teātra attīstība. Darba empīrisko daļu veido teātra recenziju kontentanalīze un diskursa analīze, kā arī septiņu teātra izrāžu semiotiskā analīze.
Immunoproteasome LMP2 60HH Variant Alters MBP Epitope Generation and Reduces the Risk to Develop Multiple Sclerosis in Italian Female Population
2010
BackgroundAlbeit several studies pointed out the pivotal role that CD4+T cells have in Multiple Sclerosis, the CD8+ T cells involvement in the pathology is still in its early phases of investigation. Proteasome degradation is the key step in the production of MHC class I-restricted epitopes and therefore its activity could be an important element in the activation and regulation of autoreactive CD8+ T cells in Multiple Sclerosis.Methodology/principal findingsImmunoproteasomes and PA28-alphabeta regulator are present in MS affected brain area and accumulated in plaques. They are expressed in cell types supposed to be involved in MS development such as neurons, endothelial cells, oligodendroc…
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 …
Sexual habits and risk factors for sexually transmitted diseases among medical students of Palermo’s University in 2010–2011.
2012
Background The Residency Program in Hygiene and Preventive Medicine at Palermo’s University has conducted a survey among the students of the local Medical School regarding their knowledge about Sexually Transmitted Diseases (STDs), with the aim to detect possible risk factors frequently associated with STDs. Objectives The study has been conducted with an anonymous questionnaire delivered, during classes, to the students attending the six years of Medical School. The medical residents on Hygiene and Preventive Medicine of the Department of Sciences for Health Promotion at Palermo’s University had previously made a short introduction about the study and its purpose and answered students’ que…
24M Progress Report. Period concerning this report: 01.01.2019-31.12.2019.
2019
During the second year of the project the main purpose was to design and develop smart fibre-reinforced plastic (FRP) plate by using the most environmentally stable nanocomposite (NC) configuration. As a result, within the support of collaboration partner Institute for Polymers, Composites and Biomaterials (IPCB, Portici, Italy) during Mobility#4 four basalt FRP plates were produced: two [0]8 plates impregnated with the epoxy or the NC, and two [0/45/90/-45]2 also impregnated with the epoxy or the NC, and two [0/45/90/-45]2. Additionally, a set of the specimens for the epoxy and epoxy filled with 0.1 wt.% of hybrid nanofiller (carbon nanotubes and nanofibers in the ratio 1:1) was developed …