521 research outputs found
PM fractional machines adopting bonded magnets: effect of different magnetizations on the energetic performance
The adoption of Permanent Magnets in small brushless machines for automotive applications is becoming frequent. Some research on bonded magnets is being carried on to substitute the ferrites. In the paper the parallel and radial magnetizations are considered: the different process complexity levels are analyzed and the effects on the iron losses and the energetic performances are evaluated by means of a simulation analysis and its experimental validatio
Rejection of randomly coinciding events in ZnMoO scintillating bolometers
Random coincidence of events (particularly from two neutrino double beta
decay) could be one of the main sources of background in the search for
neutrinoless double beta decay with cryogenic bolometers due to their poor time
resolution. Pulse-shape discrimination by using front edge analysis, mean-time
and methods was applied to discriminate randomly coinciding events in
ZnMoO cryogenic scintillating bolometers. These events can be effectively
rejected at the level of 99% by the analysis of the heat signals with rise-time
of about 14 ms and signal-to-noise ratio of 900, and at the level of 92% by the
analysis of the light signals with rise-time of about 3 ms and signal-to-noise
ratio of 30, under the requirement to detect 95% of single events. These
rejection efficiencies are compatible with extremely low background levels in
the region of interest of neutrinoless double beta decay of Mo for
enriched ZnMoO detectors, of the order of counts/(y keV kg).
Pulse-shape parameters have been chosen on the basis of the performance of a
real massive ZnMoO scintillating bolometer. Importance of the
signal-to-noise ratio, correct finding of the signal start and choice of an
appropriate sampling frequency are discussed
Temperatures evaluation in an integrated motor drive for traction applications
The integrated propulsion motor is a drive designed for an individual self-driven container rail-platform wagon developed in the ldquointegrated standard transport unitrdquo research and development project, supported by the European commission. This paper presents the study of the motor and the converter temperatures at rated and overload working conditions. The problem is afforded by combining the simulation (finite-element method and lumped-parameter models) and the experimental approaches. For this purpose, a dedicated experimental setup has been designed and realized
Transport stirrup jars in Late Mycenaean Tiryns: Maritime Transport Containers and commodity movement in political context
Transport jars from the Mycenaean citadel of Tiryns, a coastal centre in the Bronze Age, were analysed in a macroscopic and petrographic study. Over 400 vessels and vessel fragments, mostly Transport Stirrup Jars (TSJs) and Canaanite jars, were recorded; around a quarter of them were selected for analysis. The vessels derive from both the upper and lower citadel, with a few from the lower town. Their chronological span ranges from Late Helladic (LH) IIIB1 to LH IIIC Developed (ca 1300â1070 BC) but the bulk of the material dates to LH IIIB2 (ca 1200 BC), and comes from dumps derived from the final destruction of the palace. Several sources are suggested for the TSJs, some of which are inscribed with Linear B: Kythera, the eastern Aegean (perhaps Kos), Kontopigado-Alimos in Attica, Corinth and several other mainland sources, as yet unidentified. It is suggested that a large group of TSJs with shape and decoration derived from central Cretan types were produced in the vicinity of the Argive Plain. Two thirds of the TSJs, however, come from Crete. With the exception of one from the Vrokastro area of east Crete, these are evenly derived from the Chania plain and the western edge of the Mesara plain in central Crete, where the Minoan centres of Kommos, Phaistos and Ayia Triada are located. We discuss the implications of all this for our understanding of the economy and society of Crete after the destruction of the palace of Knossos, and for the relationship between Crete and the Mycenaean palatial centres in the Argolid
The role of sexual orientation in the relationships between body perception, body weight dissatisfaction, physical comparison, and eating psychopathology in the cisgender population
Purpose: Body weight dissatisfaction (BWD) and visual body perception are specific aspects that can influence the own body image, and that can concur with the development or the maintenance of specific psychopathological dimensions of different psychiatric disorders. The sexual orientation is a fundamental but understudied aspect in this field, and, for this reason, the purpose of this study is to improve knowledge about the relationships among BWD, visual body size-perception, and sexual orientation. Methods: A total of 1033 individuals participated in an online survey. Physical comparison, depression, and self-esteem was evaluated, as well as sexual orientation and the presence of an eating disorder. A Figure Rating Scale was used to assess different valences of body weight, and mediation analyses were performed to investigated specific relationships between psychological aspects. Results: Bisexual women and gay men reported significantly higher BWD than other groups (p < 0.001); instead, higher body misperception was present in gay men (p = 0.001). Physical appearance comparison mediated the effect of sexual orientation in both BWD and perceptual distortion. No difference emerged between women with a history of eating disorders and without, as regards the value of body weight attributed to attractiveness, health, and presence on social media. Conclusion: This study contributes to understanding the relationship between sexual orientations and body image representation and evaluation. Physical appearance comparisons should be considered as critical psychological factors that can improve and affect well-being. The impact on subjects with high levels of eating concerns is also discussed. Level of evidence: Level III: case\u2013control analytic study
H-Bridge Converter as Basic Switching Topology Workbench in Power Electronics Teaching
This article deals with an effective power electronics learning setup based on a Full-Bridge converter used to teach electrical energy conversion experimentally. In the proposed learning by doing methodology, the hardware and the software are properly mixed in order to obtain an easy-to-use experimental learning environment. In this paper, the H-Bridge is the fundamental brick to
build studentsâ knowledge on the main topics of power electronics converter circuit in different operative conditions. This H-Bridge comes with a reconfigurable output LCL to achieve several basic DC-DC powerconverters topologies. Converter current and voltage switching behavior can be investigated using the proposed setup. Furthermore, the friendly hardware and software
set-up allows studying the converter modulation and control techniques of the different power electronics circuits
A multi-site real-time co-simulation platform for the testing of control strategies of distributed storage and V2G in distribution networks
© 2016 IEEE and EPE Association. This paper presents a real-time co-simulation platform aimed to test control strategies for the management of the interaction between a smart grid and active prosumers. The main feature of the proposed framework relies on the multi-site approach that allows the decoupling between the network model and the system under test. This allows separate testing with the exchange of a limited amount of information between the two systems, helping to preserve the confidentiality of data belonging to different parties. As an example the paper addresses the development and testing of a distributed storage and vehicle-to-grid management system connected to a real distribution network model
Background suppression in massive TeO bolometers with Neganov-Luke amplified light detectors
Bolometric detectors are excellent devices for the investigation of
neutrinoless double-beta decay (0). The observation of such
decay would demonstrate the violation of lepton number, and at the same time it
would necessarily imply that neutrinos have a Majorana character. The
sensitivity of cryogenic detectors based on TeO is strongly limited by the
alpha background in the region of interest for the 0 of
Te. It has been demonstrated that particle discrimination in TeO
bolometers is possible measuring the Cherenkov light produced by particle
interactions. However an event-by-event discrimination with NTD-based light
detectors has to be demonstrated. We will discuss the performance of a
highly-sensitive light detector exploiting the Neganov-Luke effect for signal
amplification. The detector, being operated with NTD-thermistor and coupled to
a 750 g TeO crystal, shows the ability for an event-by-event identification
of electron/gamma and alpha particles. The extremely low detector baseline
noise, RMS 19 eV, demonstrates the possibility to enhance the sensitivity of
TeO-based 0 experiment to an unprecedented level
Health-related quality of life assessment in eating disorders: adjustment and validation of a specific scale with the inclusion of an interpersonal domain
Purpose: Quality of life is a fundamental aspect of both clinical practice and research on eating disorders (ED) due to the significant impacts these disorders have on everyday life. Disorder-specific scales can improve the quality of research and findings and offer greater sensitivity and responsiveness. However, no specific instrument is available in Italian for ED. The aim of this paper is to adjust and to validate a reliable scale with specific items regarding physical and interpersonal well-being. Methods: The Italian version of the Eating Disorder Quality of Life (IEDQOL) scale was developed, on the basis of the original English scale, with the addition of items pertaining to physical well-being and interpersonal interactions. In this study, 180 ED patients and 190 healthy controls from the community were enrolled both from inpatient units and outpatient services. A statistical analysis with an exploratory factorial approach was performed in order to validate the tool. Results: The results showed that the IEDQOL has very good psychometric properties with testâretest validity and sensitivity between patients and controls (d = 2.17 for total score). Moreover, the interpersonal domain showed excellent psychometric values (Cronbachâs α > 0.70 in all the subgroups) and a robust correlation with other quality of life constructs. Conclusion: Future studies on the Italian population should use IEDQOL as outcome element that can be useful also with other disorder-specific psychopathological constructs and corroborate the reliability of the data. Future research in the ED field should only use this specific tool. Level of evidence: Caseâcontrol analytic study, Level III
High-dose-rate brachytherapy for high-grade vaginal intraepithelial neoplasia: A dosimetric analysis
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