1,931 research outputs found
CdWO4 scintillating bolometer for Double Beta Decay: Light and Heat anticorrelation, light yield and quenching factors
We report the performances of a 0.51 kg CdWO4 scintillating bolometer to be
used for future Double Beta Decay Experiments. The simultaneous read-out of the
heat and the scintillation light allows to discriminate between different
interacting particles aiming at the disentanglement and the reduction of
background contribution, key issue for next generation experiments. We will
describe the observed anticorrelation between the heat and the light signal and
we will show how this feature can be used in order to increase the energy
resolution of the bolometer over the entire energy spectrum, improving up to a
factor 2.6 on the 2615 keV line of 208Tl. The detector was tested in a 433 h
background measurement that permitted to estimate extremely low internal trace
contaminations of 232Th and 238U. The light yield of gamma/beta, alpha and
neutrons is presented. Furthermore we developed a method in order to correctly
evaluate the absolute thermal quenching factor of alpha particles in
scintillating bolometers.Comment: 8 pages 7 figure
Global Tracking Passivity--based PI Control of Bilinear Systems and its Application to the Boost and Modular Multilevel Converters
This paper deals with the problem of trajectory tracking of a class of
bilinear systems with time--varying measurable disturbance. A set of matrices
{A,B_i} has been identified, via a linear matrix inequality, for which it is
possible to ensure global tracking of (admissible, differentiable) trajectories
with a simple linear time--varying PI controller. Instrumental to establish the
result is the construction of an output signal with respect to which the
incremental model is passive. The result is applied to the boost and the
modular multilevel converter for which experimental results are given.Comment: 9 pages, 10 figure
Generation of Noise Time Series with arbitrary Power Spectrum
Noise simulation is a very powerful tool in signal analysis helping to
foresee the system performance in real experimental situations. Time series
generation is however a hard challenge when a robust model of the noise sources
is missing. We present here a simple computational technique which allows the
generation of noise samples of fixed length, given a desired power spectrum. A
few applications of the method are also discussed.Comment: 4 pages, 7 figure
LDL-C: Lower is Better for Longer - Even at Low Risk
Background: Low-density lipoprotein cholesterol (LDL-C) causes atherosclerotic disease, as demonstrated in experimental and epidemiological cohorts, randomised controlled trials, and Mendelian randomisation studies.
Main text: There is considerable inconsistency between existing guidelines as to how to effectively manage patients at low overall risk of cardiovascular disease (CVD) who have persistently elevated levels of LDL-C.
We propose a step-by-step practical approach for the management of cardiovascular risks in individuals with low ( 140 mg/dL, 3.6 mmol/L) LDL-C. The strategy proposed is based on the level of adherence to lifestyle interventions (LSI), and in case of non-adherence, stepwise practical management, including lipid-lowering therapy, is recommended to achieve a target LDL-C levels (< 115 mg/dL, 3.0 mmol/L).
Conclusions: Further studies are necessary to answer the questions on the long-term efficacy, safety, and cost-effectiveness of the suggested approach. This is critical, considering the ever-increasing numbers of such low-risk patients seen in clinical practice
Sull’interpretazione di alcuni eventi sismici particolari registrati dalla Rete Sismica Nazionale Centralizzata
Il presente lavoro costituisce un contributo nel campo dell’interpretazione e del riconoscimento delle
forme d’onda generate durante un evento sismico sia di origine naturale sia artificiale. In esso vengono
descritti una serie di fenomeni particolari studiati nel corso degli anni da parte del gruppo di analisti
che si occupa dell’interpretazione dei dati sismici registrati dalla Rete Sismica Nazionale Centralizzata
(RSNC) dell’Istituto Nazionale di Geofisica e Vulcanologia (INGV).
Vengono, inoltre, presentati alcuni eventi “contemporanei” locali nonché alcuni casi di eventi locali
“contemporanei” ad eventi regionali o telesismici. Successivamente sono illustrati alcuni esempi di
eventi sismici “caratteristici” sia di origine naturale (terremoti profondi, eruzioni vulcaniche, terremoti
di origine vulcanica e frane) sia di origine artificiale (esplosioni). La presente pubblicazione, oltre ad
avere un carattere divulgativo riguardante le esperienze maturate negli ultimi anni dal gruppo di lavoro,
ha anche lo scopo di mettere in evidenza alcune peculiarità della sismicità presente nel territorio
italiano
An innovative technique for the investigation of the 4-fold forbidden beta-decay of V
For the first time a Vanadium-based crystal was operated as cryogenic
particle detector. The scintillating low temperature calorimetric technique was
used for the characterization of a 22 g YVO crystal aiming at the
investigation of the 4-fold forbidden non-unique decay of V.
The excellent bolometric performance of the compound together with high light
output of the crystal makes it an outstanding technique for the study of such
elusive rate process. The internal radioactive contaminations of the crystal
are also investigated showing that an improvement on the current status of
material selection and purification are needed, U and Th
are measured at the level of 28 mBq/kg, 1.3 Bq/kg and 28 mBq/kg, respectively.
In this work, we also discuss a future upgrade of the experimental set-up which
may pave the road for the detection of the rare V decay
ZnMoO4: a promising bolometer for neutrinoless double beta decay searches
We investigate the performances of two ZnMoO4 scintillating crystals operated
as bolometers, in view of a next generation experiment to search the
neutrinoless double beta decay of Mo-100. We present the results of the alpha
vs beta/gamma discrimination, obtained through the scintillation light as well
as through the study of the shape of the thermal signal alone. The
discrimination capability obtained at the 2615 keV line of Tl-208 is 8 sigma,
using the heat-light scatter plot, while it exceeds 20 sigma using the shape of
the thermal pulse alone. The achieved FWHM energy resolution ranges from 2.4
keV (at 238 keV) to 5.7 keV (at 2615 keV). The internal radioactive
contaminations of the ZnMoO4 crystals were evaluated through a 407 hours
background measurement. The obtained limit is < 32 microBq/kg for Th-228 and
Ra-226. These values were used for a Monte Carlo simulation aimed at evaluating
the achievable background level of a possible, future array of enriched ZnMoO4
crystals.Comment: 9 pages, 8 figure
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