25,627 research outputs found
Performances of a Newly High Sensitive Trilayer F/Cu/F GMI Sensor
We have selected stress-annealed nanocrystalline Fe-based ribbons for
ferromagnetic/copper/ferromagnetic sensors exhibiting high magneto-impedance
ratio. Longitudinal magneto-impedance reaches 400% at 60 kHz and longitudinal
magneto-resistance increases up to 1300% around 200 kHz.Comment: 4 pages, 6 figures, Sensors and Actuators A (in review
A Framework for Responsive Environments
In this paper, we define Responsive Environments as adaptive ven- ues that possess context awareness, deliver ubiquitous computing and natural interaction. They also yield a pre-determined User Experience. We propose a framework for the development and assessment of such environments and we discuss applying the framework to some examples. Highlighting benefits and usefulness of the framework
Geometric scaling of purely-elastic flow instabilities
We present a combined experimental, numerical and theoretical investigation
of the geometric scaling of the onset of a purely-elastic flow instability in a
serpentine channel. Good qualitative agreement is obtained between experiments,
using dilute solutions of flexible polymers in microfluidic devices, and
two-dimensional numerical simulations using the UCM model. The results are
confirmed by a simple theoretical analysis, based on the dimensionless
criterion proposed by Pakdel-McKinley for onset of a purely-elastic
instability
Fisiologia e tecnologia pós-colheita do pedúnculo do caju.
O extenso territorio brasileiro, caracterizado por variadas condicoes climaticas e por distintos tipos de solos, apresenta uma producao agricola extremamente diversificada, que confere ao pais o titulo de principal produtor mundial de varios produtos. A fruticultura, nao obstante representar apenas 5% das areas cultivadas no pais, e uma das atividades capazes de assegurar ao Brasil um percentual significativo do volume de producao global, colocando-se em primeiro lugar no ranking dos produtores de frutas (FAO, 1992 e Carraro & Cunha, 1994). Apesar da importancia do setor para o pais, nao existe paralelismo entre aumento da producao e avanco de tecnologias de pos-colheita capazes de minimizar as perdas.bitstream/item/34621/1/Dc-017.pd
Remote experimentation: integrating research, education, and industrial application
This paper presents a low-cost scaled model of a silo for drying and airing cereal grains. It allows the control and monitor of several parameters associated to the silo's operation, through a remote accessible infrastructure. The scaled model consists of a 2.50 m wide × 2.10 m long plant with all control and monitor capacities provided by micro-Web servers. An application running on the micro-Web servers enables storing all parameters in a data basis for later analysis. The implemented model aims to support a remote experimentation facility for technological education, research-oriented tutorials, and industrial applications. Given the low-cost requirement, this remote facility can be easily replicated in other institutions to support a network of remote labs, which encompasses the concurrent access of several users (e.g. students)
From cheating to teaching: a path for conversion of illegal gambling machines
Video poker machines, a former symbol of fraud and gambling in Brazil, are now being
converted into computer-based educational tools for Brazilian public primary schools and also
for governmental and non-governmental institutions dealing with communities of poverty and
social exclusion, in an attempt to reduce poverty risks (decrease money spent on gambling)
and promote social inclusion (increase access and motivation to education). Thousands of
illegal gambling machines are seized by federal authorities, in Brazil, every year, and usually
destroyed at the end of the criminal apprehension process.
This paper describes a project developed by the University of Southern Santa Catarina, Brazil,
responsible for the conversion process of gambling machines, and the social inclusion
opportunities derived from it. All project members worked on a volunteer basis, seeking to
promote social inclusion of Brazilian young boys and girls, namely through digital inclusion. So
far, the project has been able to convert over 200 gambling machines and install them in over
40 public primary schools, thus directly benefiting more than 12,000 schoolchildren.
The initial motivation behind this project was technology based, however the different options
arising from the conversion process of the gambling machines have also motivated a rather
innovative and unique experience in allowing schoolchildren and young people with special
(educational) needs to access to computer-based pedagogical applications. The availability of these converted machines also helps to place Information and
Communication Technologies (ICT) in the very daily educational environment of these children
and youngsters, thus serving social and cultural inclusion aspects, by establishing a dialogue
with the community and their technological expectations, and also directly contributing to their
digital literacy
Functionalizing self-assembled GaN quantum dot superlattices by Eu-implantation
Self-assembled GaN quantum dots (QDs) stacked in superlattices (SL) with AlN spacer layers were implanted with Europium ions to fluences of 1013, 1014, and 1015 cm−2. The damage level introduced in the QDs by the implantation stays well below that of thick GaN epilayers. For the lowest fluence, the structural properties remain unchanged after implantation and annealing while for higher fluences the implantation damage causes an expansion of the SL in the [0001] direction which increases with implantation fluence and is only partly reversed after thermal annealing at 1000 °C. Nevertheless, in all cases, the SL quality remains very good after implantation and annealing with Eu ions incorporated preferentially into near-substitutional cation sites. Eu3+ optical activation is achieved after annealing in all samples. In the sample implanted with the lowest fluence, the Eu3+ emission arises mainly from Eu incorporated inside the QDs while for the higher fluences only the emission from Eu inside the AlN-buffer, capping, and spacer layers is observed.
© 2010 American Institute of PhysicsFCT-PTDC/CTM/100756/2008program PESSOA EGIDE/GRICESFCT-SFRH/BD/45774/2008FCT-SFRH/BD/44635/200
The extended gaussian ensemble and metastabilities in the Blume-Capel model
The Blume-Capel model with infinite-range interactions presents analytical
solutions in both canonical and microcanonical ensembles and therefore, its
phase diagram is known in both ensembles. This model exhibits nonequivalent
solutions and the microcanonical thermodynamical features present peculiar
behaviors like nonconcave entropy, negative specific heat, and a jump in the
thermodynamical temperature. Examples of nonequivalent ensembles are in general
related to systems with long-range interactions that undergo canonical
first-order phase transitions. Recently, the extended gaussian ensemble (EGE)
solution was obtained for this model. The gaussian ensemble and its extended
version can be considered as a regularization of the microcanonical ensemble.
They are known to play the role of an interpolating ensemble between the
microcanonical and the canonical ones. Here, we explicitly show how the
microcanonical energy equilibrium states related to the metastable and unstable
canonical solutions for the Blume-Capel model are recovered from EGE, which
presents a concave "extended" entropy as a function of energy.Comment: 6 pages, 5 eps figures. Presented at the XI Latin American Workshop
on Nonlinear Phenomena, October 05-09 (2009), B\'uzios (RJ), Brazil. To
appear in JPC
A Framework for Responsive Environments
In this paper, we define Responsive Environments as adaptive ven- ues that possess context awareness, deliver ubiquitous computing and natural interaction. They also yield a pre-determined User Experience. We propose a framework for the development and assessment of such environments and we discuss applying the framework to some examples. Highlighting benefits and usefulness of the framework
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