7,919 research outputs found
A Tesseract-based Optical Character Recognition for a Text-to-Braille Code Conversion
This study provided a platform that converts printed text documents into corresponding braille code that will trigger the palpable output of the braille cells. The system is composed of two main parts: the image scanner and the microcontroller-based braille platform. The image scanner captures the printed text document and performs a series of pre-processing algorithms where the processed image will be subjected to character recognition using Tesseract. It is open-source software for character recognition capable of recognizing text characters in different fonts and sizes. SimpleCV, also an open-source software for computer vision and a simpler version of an OpenCV, was utilized in pre-processing of images where binarization, filtering, edge detection, and character segmentation are performed. This will allow the microcontroller-based braille platform to interpret the printed characters from the generated braille code in ASCII format that will trigger the palpable output of the braille cells. The developed system was subjected to functionality and accuracy testing to assess its performance. Accuracy was based on the capability of the system to produce the right braille outputs that match the scanned line of text which are in Arial font. The testing was conducted utilizing the Arial font size of 12, 14, 16, 18, 20, 22, and 24. Results show that the system is capable of recognizing text with greater than 85 % accuracy starting at font size 18 with an average accuracy of 88.09 % and increases accordingly as the font size increases
A two-layer shallow water model for bedload sediment transport: convergence to Saint-Venant-Exner model
A two-layer shallow water type model is proposed to describe bedload sediment
transport. The upper layer is filled by water and the lower one by sediment.
The key point falls on the definition of the friction laws between the two
layers, which are a generalization of those introduced in Fern\'andez-Nieto et
al. (ESAIM: M2AN, 51:115-145, 2017). This definition allows to apply properly
the two-layer shallow water model for the case of intense and slow bedload
sediment transport. Moreover, we prove that the two-layer model converges to a
Saint-Venant-Exner system (SVE) including gravitational effects when the ratio
between the hydrodynamic and morphodynamic time scales is small. The SVE with
gravitational effects is a degenerated nonlinear parabolic system. This means
that its numerical approximation is very expensive from a computational point
of view, see for example T. Morales de Luna et al. (J. Sci. Comp., 48(1):
258-273, 2011). In this work, gravitational effects are introduced into the
two-layer system without such extra computational cost. Finally, we also
consider a generalization of the model that includes a non-hydrostatic pressure
correction for the fluid layer and the boundary condition at the sediment
surface. Numerical tests show that the model provides promising results and
behave well in low transport rate regimes as well as in many other situations
Formal deduction of the Saint-Venant-Exner model including arbitrarily sloping sediment beds and associated energy
In this work we present a deduction of the Saint-Venant-Exner model through
an asymptotic analysis of the Navier-Stokes equations. A multi-scale analysis
is performed in order to take into account that the velocity of the sediment
layer is smaller than the one of the fluid layer. This leads us to consider a
shallow water type system for the fluid layer and a lubrication Reynolds
equation for the sediment one. This deduction provides some improvements with
respect to the classical Saint-Venant-Exner model: (i) the deduced model has an
associated energy. Moreover, it allows us to explain why classical models do
not have an associated energy and how to modify them in order to recover a
model with this property. (ii) The model incorporates naturally a necessary
modification that must be taken into account in order to be applied to
arbitrarily sloping beds. Furthermore, we show that this modification is
different of the ones considered classically, and that it coincides with a
classical one only if the solution has a constant free surface. (iii) The
deduced solid transport discharge naturally depends on the thickness of the
moving sediment layer, what allows to ensure sediment mass conservation.
Moreover, we include a simplified version of the model for the case of
quasi-stationary regimes. Some of these simplified models correspond to the
generalization of classical ones such as Meyer-PeterM\"uller and
Ashida-Michiue models. Three numerical tests are presented to study the
evolution of a dune for several definition of the repose angle, to see the
influence of the proposed definition of the effective shear stress in
comparison with the classical one, and by comparing with experimental data.Comment: 44 pages, sumbitted to Advances in Water Resources 17 july 201
Longitudinal oscillations in density stratified and expanding solar waveguides
Waves and oscillations can provide vital information about the internal
structure of waveguides they propagate in. Here, we analytically investigate
the effects of density and magnetic stratification on linear longitudinal
magnetohydrodynamic (MHD) waves. The focus of this paper is to study the
eigenmodes of these oscillations. It is our specific aim is to understand what
happens to these MHD waves generated in flux tubes with non-constant (e.g.,
expanding or magnetic bottle) cross-sectional area and density variations. The
governing equation of the longitudinal mode is derived and solved analytically
and numerically. In particular, the limit of the thin flux tube approximation
is examined. The general solution describing the slow longitudinal MHD waves in
an expanding magnetic flux tube with constant density is found. Longitudinal
MHD waves in density stratified loops with constant magnetic field are also
analyzed. From analytical solutions, the frequency ratio of the first overtone
and fundamental mode is investigated in stratified waveguides. For small
expansion, a linear dependence between the frequency ratio and the expansion
factor is found. From numerical calculations it was found that the frequency
ratio strongly depends on the density profile chosen and, in general, the
numerical results are in agreement with the analytical results. The relevance
of these results for solar magneto-seismology is discussed.Comment: 10 pages, 5 figures, published in ApJ, uses emulateap
On the classical-quantum correspondence for the scattering dwell time
Using results from the theory of dynamical systems, we derive a general
expression for the classical average scattering dwell time, tau_av. Remarkably,
tau_av depends only on a ratio of phase space volumes. We further show that,
for a wide class of systems, the average classical dwell time is not in
correspondence with the energy average of the quantum Wigner time delay.Comment: 5 pages, 1 figur
Population stability: regulating size in the presence of an adversary
We introduce a new coordination problem in distributed computing that we call
the population stability problem. A system of agents each with limited memory
and communication, as well as the ability to replicate and self-destruct, is
subjected to attacks by a worst-case adversary that can at a bounded rate (1)
delete agents chosen arbitrarily and (2) insert additional agents with
arbitrary initial state into the system. The goal is perpetually to maintain a
population whose size is within a constant factor of the target size . The
problem is inspired by the ability of complex biological systems composed of a
multitude of memory-limited individual cells to maintain a stable population
size in an adverse environment. Such biological mechanisms allow organisms to
heal after trauma or to recover from excessive cell proliferation caused by
inflammation, disease, or normal development.
We present a population stability protocol in a communication model that is a
synchronous variant of the population model of Angluin et al. In each round,
pairs of agents selected at random meet and exchange messages, where at least a
constant fraction of agents is matched in each round. Our protocol uses
three-bit messages and states per agent. We emphasize that
our protocol can handle an adversary that can both insert and delete agents, a
setting in which existing approximate counting techniques do not seem to apply.
The protocol relies on a novel coloring strategy in which the population size
is encoded in the variance of the distribution of colors. Individual agents can
locally obtain a weak estimate of the population size by sampling from the
distribution, and make individual decisions that robustly maintain a stable
global population size
Produção de biomassa na época chuvosa em caatinga manipulada na região norte do estado do Ceará.
A Caatinga é o bioma típico do semiárido brasileiro. Este bioma, que se encontra em diferentes estádios de sucessão secundária, é dominado por espécies herbáceas e lenhosas arbustivas, com pouco ou nenhum valor forrageiro. Possivelmente, isto foi conseqüência do manejo pastoril inadequado (superpastejo) ao longo da utilização da Caatinga como pastagem nativa. Assim, este trabalho teve como objetivos, avaliar a produção de biomassa na vegetação manipulada da Caatinga. Foram coletadas mensalmente amostras do estrato herbáceo e arbustivo (até 1,5 metro de altura) de uma Caatinga manejada, na fazenda experimental da Embrapa Caprinos e Ovinos, no município de Sobral, Ceará-Brasil. As amostras foram coletadas, utilizando-se molduras de ferro chato, aos 30, 60, 90, 120, 150 e 180 dias de crescimento da Caatinga, durante a estação das chuvas. A produção total de biomassa foi de 14.469,57 kgMS.ha-¹ no período analisado, sendo junho o mês de maior produção (3.687,75 kgMS.ha)
Basin structure in the two-dimensional dissipative circle map
Fractal basin structure in the two-dimensional dissipative circle map is
examined in detail. Numerically obtained basin appears to be riddling in the
parameter region where two periodic orbits co-exist near a boundary crisis, but
it is shown to consist of layers of thin bands.Comment: published in J. Phys. Soc. Jpn., 72, 1943-1947 (2003
Formal deduction of the Saint-Venant-Exner model including arbitrarily sloping sediment beds and associated energy
In this work we present a deduction of the Saint-Venant-Exner model through
an asymptotic analysis of the Navier-Stokes equations. A multi-scale analysis is
performed in order to take into account that the velocity of the sediment layer is
smaller than the one of the
uid layer. This leads us to consider a shallow water
type system for the
uid layer and a lubrication Reynolds equation for the sediment
one. This deduction provides some improvements with respect to the classical Saint-
Venant-Exner model: (i) the deduced model has an associated energy. Moreover,
it allows us to explain why classical models do not have an associated energy and
how to modify them in order to recover a model with this property. (ii) The model
incorporates naturally a necessary modi cation that must be taken into account in
order to be applied to arbitrarily sloping beds. Furthermore, we show that this
modi cation is di erent of the ones considered classically, and that it coincides with
a classical one only if the solution has a constant free surface. (iii) The deduced
solid transport discharge naturally depends on the thickness of the moving sediment
layer, what allows to ensure sediment mass conservation. Moreover, we include a
simpli ed version of the model for the case of quasi-stationary regimes. Some of these
simpli ed models correspond to the generalization of classical ones such as Meyer-
Peter&M uller and Ashida-Michiue models. Three numerical tests are presented to
study the evolution of a dune for several de nition of the repose angle, to see the
in
uence of the proposed de nition of the e ective shear stress in comparison with
the classical one, and by comparing with experimental data
Combination of Electrochemical Processes with Membrane Bioreactors for Wastewater Treatment and Fouling Control: A Review
This paper provides a critical review about the integration of electrochemical processes into membrane bioreactors (MBR) in order to understand the influence of these processes on wastewater treatment performance and membrane fouling control. The integration can be realized either in an internal or an external configuration. Electrically enhanced membrane bioreactors or electro membrane bioreactors (eMBRs) combine biodegradation, electrochemical and membrane filtration processes into one system providing higher effluent quality as compared to conventional MBRs and activated sludge plants. Furthermore, electrochemical processes, such as electrocoagulation, electrophoresis, and electroosmosis, help to mitigate deposition of foulants into the membrane and enhance sludge dewaterability by controlling the morphological properties and mobility of the colloidal particles and bulk liquid. Intermittent application of minute electric field has proven to reduce energy consumption and operational cost as well as minimize the negative effect of direct current field on microbial activity which are some of the main concerns in eMBR technology. The present review discusses important design considerations of eMBR, its advantages as well as its applications to different types of wastewater. It also presents several challenges that need to be addressed for future development of this hybrid technology which include treatment of high strength industrial wastewater and removal of emerging contaminants, optimization study, cost benefit analysis and the possible combination with microbial electrolysis cell for biohydrogen production
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