212 research outputs found
A 400 Hz, 100 kVA, digitally controlled UPS for airport installations
Abstract -The paper describes analysis, design and prototyping in reduced scale of a digitally controlled inverter for uninterruptible power supply (UPS) applications. The converter is rated for 100 kVA nominal power and 400 Hz, three-phase, 220 V sinusoidal output voltage. The final equipment is meant to be installed in airport docks and used as the aircraft's electrical power supply during refuelling and loading operations. It will be manufactured with different power ratings ranging from 30 to 300 kVA. The power converter and digital control circuits are devised to provide rated voltage and frequency with a fairly low output impedance, so as to keep the voltage total harmonic distortion (THD) small even in the presence of highly distorting loads. Simulation results for the rated converter and experimental results from a scaled (5 kVA) prototype are given, which illustrate the expected converter performance
A new FSA approach for in situ -ray spectroscopy
An increasing demand of environmental radioactivity monitoring comes both
from the scientific community and from the society. This requires accurate,
reliable and fast response preferably from portable radiation detectors. Thanks
to recent improvements in the technology, -spectroscopy with sodium
iodide scintillators has been proved to be an excellent tool for in-situ
measurements for the identification and quantitative determination of
-ray emitting radioisotopes, reducing time and costs. Both for
geological and civil purposes not only K, U, and Th have
to be measured, but there is also a growing interest to determine the
abundances of anthropic elements, like Cs and I, which are used
to monitor the effect of nuclear accidents or other human activities.
The Full Spectrum Analysis (FSA) approach has been chosen to analyze the
-spectra. The Non Negative Least Square (NNLS) and the energy
calibration adjustment have been implemented in this method for the first time
in order to correct the intrinsic problem related with the
minimization which could lead to artifacts and non physical results in the
analysis.
A new calibration procedure has been developed for the FSA method by using in
situ -spectra instead of calibration pad spectra. Finally, the new
method has been validated by acquiring -spectra with a 10.16 cm x 10.16
cm sodium iodide detector in 80 different sites in the Ombrone basin, in
Tuscany. The results from the FSA method have been compared with the laboratory
measurements by using HPGe detectors on soil samples collected in the different
sites, showing a satisfactory agreement between them. In particular, the
Cs isotopes has been implemented in the analysis since it has been
found not negligible during the in-situ measurements.Comment: accepted by Science of Total Environment: 8 pages, 10 figures, 3
table
Estudo da variabilidade genética de plantas oriundas da embriogênese somática de genótipos de batata-doce utilizando marcadores RAPD.
bitstream/CNPH-2009/31499/1/bpd_10.pd
Análise de transferibilidade de primers microssatélites de Cucumis melo para Cucurbita moschata e Luffa cylindric.
bitstream/CENARGEN/29527/1/bp203.pd
Mapping of natural radioelements using gamma-ray spectrometry: Tuscany Region case of study.
http://www.fe.infn.it/u/mantovani/CV/Proceedings/Bezzon_11a.pd
Mapa genético baseado em marcadores microssatélites e RAPD utilizando populações de melhoramento contrastante para teor de fibra no feijoeiro comum (Phaseolus vulgaris L.).
O objetivo deste trabalho foi à construção de um mapa genético do feijoeiro comum, utilizando populações de melhoramento contrastante para o teor de fibra com base em marcadores microssatélites e RAPD
A multivariate spatial interpolation of airborne {\gamma}-ray data using the geological constraints
In this paper we present maps of K, eU, and eTh abundances of Elba Island
(Italy) obtained with a multivariate spatial interpolation of airborne
{\gamma}-ray data using the constraints of the geologic map. The radiometric
measurements were performed by a module of four NaI(Tl) crystals of 16 L
mounted on an autogyro. We applied the collocated cokriging (CCoK) as a
multivariate estimation method for interpolating the primary under-sampled
airborne {\gamma}-ray data considering the well-sampled geological information
as ancillary variables. A random number has been assigned to each of 73
geological formations identified in the geological map at scale 1:10,000. The
non-dependency of the estimated results from the random numbering process has
been tested for three distinct models. The experimental cross-semivariograms
constructed for radioelement-geology couples show well-defined co-variability
structures for both direct and crossed variograms. The high statistical
correlations among K, eU, and eTh measurements are confirmed also by the same
maximum distance of spatial autocorrelation. Combining the smoothing effects of
probabilistic interpolator and the abrupt discontinuities of the geological
map, the results show a distinct correlation between the geological formation
and radioactivity content. The contour of Mt. Capanne pluton can be
distinguished by high K, eU and eTh abundances, while different degrees of
radioactivity content identify the tectonic units. A clear anomaly of high K
content in the Mt. Calamita promontory confirms the presence of felsic dykes
and hydrothermal veins not reported in our geological map. Although we assign a
unique number to each geological formation, the method shows that the internal
variability of the radiometric data is not biased by the multivariate
interpolation.Comment: 43 pages, 9 figures, 5 tables. In Remote Sensing of Environment
(2013
- …