1,024 research outputs found
Co-design of a controller and its digital implementation: the MOBY-DIC2 toolbox for embedded model predictive control
Several software tools are available in the literature for the design and embedded implementation of linear model predictive control (MPC), both in its implicit and explicit (either exact or approximate) forms. Most of them generate C code for easy implementation on a microcontroller, and the others can convert the C code into hardware description language code for implementation on a field programmable gate array (FPGA). However, a unified tool allowing one to generate efficient embedded MPC for an FPGA, starting from the definition of the plant and its constraints, was still missing. The MOBY-DIC2 toolbox described in this brief bridges this gap. To illustrate its functionalities, the tool is exploited to embed the controller and observer for a real buck power converter in an FPGA. This implementation achieves a latency of about 30 µs with the implicit controller and 240 μs with the approximate explicit controller
La scheda interattiva di INNOVance per prodotti in laterizio
Anche per i laterizi la scheda tecnica di prodotto, sviluppata nell’ambito del pro getto INNOVance, assume un ruolo fondamentale a supporto della progettazione e della gestione delle informazioni nelle diverse fasi del processo edilizio. L’insieme di dati contenuti in ciascuna scheda sarà associato alla rappresentazione di oggetti innovativi di tipo BIM 'Building Information Model
Effects of High Charge Densities in Multi-GEM Detectors
A comprehensive study, supported by systematic measurements and numerical
computations, of the intrinsic limits of multi-GEM detectors when exposed to
very high particle fluxes or operated at very large gains is presented. The
observed variations of the gain, of the ion back-flow, and of the pulse height
spectra are explained in terms of the effects of the spatial distribution of
positive ions and their movement throughout the amplification structure. The
intrinsic dynamic character of the processes involved imposes the use of a
non-standard simulation tool for the interpretation of the measurements.
Computations done with a Finite Element Analysis software reproduce the
observed behaviour of the detector. The impact of this detailed description of
the detector in extreme conditions is multiple: it clarifies some detector
behaviours already observed, it helps in defining intrinsic limits of the GEM
technology, and it suggests ways to extend them.Comment: 5 pages, 6 figures, 2015 IEEE Nuclear Science Symposiu
Charge Transfer Properties Through Graphene Layers in Gas Detectors
Graphene is a single layer of carbon atoms arranged in a honeycomb lattice
with remarkable mechanical, electrical and optical properties. For the first
time graphene layers suspended on copper meshes were installed into a gas
detector equipped with a gaseous electron multiplier. Measurements of low
energy electron and ion transfer through graphene were conducted. In this paper
we describe the sample preparation for suspended graphene layers, the testing
procedures and we discuss the preliminary results followed by a prospect of
further applications.Comment: 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference
with the 21st Symposium on Room-Temperature Semiconductor X-Ray and Gamma-Ray
Detectors, 4 pages, 8 figure
The Resistive-Plate WELL with Argon mixtures - a robust gaseous radiation detector
A thin single-element THGEM-based, Resistive-Plate WELL (RPWELL) detector was
operated with 150 GeV/c muon and pion beams in Ne/(5%CH), Ar/(5%CH) and
Ar/(7%CO); signals were recorded with 1 cm square pads and SRS/APV25
electronics. Detection efficiency values greater than 98% were reached in all
the gas mixtures, at average pad multiplicity of 1.2. The use of the
10{\Omega}cm resistive plate resulted in a completely discharge-free
operation also in intense pion beams. The efficiency remained essentially
constant at 98-99% up to fluxes of 10Hz/cm, dropping by a few %
when approaching 10 Hz/cm. These results pave the way towards
cost-effective, robust, efficient, large-scale detectors for a variety of
applications in future particle, astro-particle and applied fields. A potential
target application is digital hadron calorimetry.Comment: presented at the 2016 VIenna Conf. On instrumentation. Submitted to
the Conference proceeding
SpBase: the sea urchin genome database and web site
SpBase is a system of databases focused on the genomic information from sea urchins and related echinoderms. It is exposed to the public through a web site served with open source software (http://spbase.org/). The enterprise was undertaken to provide an easily used collection of information to directly support experimental work on these useful research models in cell and developmental biology. The information served from the databases emerges from the draft genomic sequence of the purple sea urchin, Strongylocentrotus purpuratus and includes sequence data and genomic resource descriptions for other members of the echinoderm clade which in total span 540 million years of evolutionary time. This version of the system contains two assemblies of the purple sea urchin genome, associated expressed sequences, gene annotations and accessory resources. Search mechanisms for the sequences and the gene annotations are provided. Because the system is maintained along with the Sea Urchin Genome resource, a database of sequenced clones is also provided
Identification of invisible biological traces in forensic evidences by hyperspectral NIR imaging combined with chemometrics
Mercury in fishes from Augusta Bay (southern Italy): Risk assessment and health implication
Our study reports on the total mercury (HgT) concentrations measured in the muscles and livers of several
benthic, demersal and pelagic fish species caught inside and outside of Augusta Bay (southern Italy),
a semi-enclosed marine area, highly contaminated by the uncontrolled (since the 1950s to 1978s) discharge
of the largest European petrochemical plant. Mercury levels in fish tissues are discussed with
regard to specific habitat, size and/or age of the specimens and HgT distribution in the bottom sediments.
Results suggest a still active Hg release mechanism from the polluted sediments to the marine environment.
Also, the high HgT concentrations measured in fishes caught in the external area of the bay imply a
potential role of Augusta Bay as a pollutant source for the Mediterranean ecosystem. Finally, values of
hazard target quotient (THQ) and estimated weekly intake (EWI) demonstrate that consumption of fishes
caught inside the bay represents a serious risk for human health. Also, data indicate that intake of fishes
caught from the external area of the bay, especially for that concern demersal and benthic species, could
be represent a significant component of risk for the local population
Observation of strong wavelength-shifting in the argon-tetrafluoromethane system
We report the scintillation spectra of Ar-CF mixtures in the range
210-800~nm, obtained under X-ray irradiation for various pressures (1-5~bar)
and concentrations (0-100%). Special care was taken to eliminate effects
related to space charge and recombination, so that results can be extrapolated
following conventional wisdom to those expected for minimum ionizing particles
under the typical electric fields employed in gaseous instrumentation. Our
study sheds light into the microscopic pathways leading to scintillation in
this family of mixtures.Comment: Updated to match current journal submissio
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