276 research outputs found
Desarrollo e implementación de un sistema de estadísticas y delitos cometidos en la ciudad de Guayaquil
The objective of this project consist in the implementation of a Crime Statistics System , to allow the register of complaints by citizens who are victims of crime, those complaints are obtained from the police station. It will generate statistical reports based on collected reports given period of time as weekly, monthly and yearly, which can be downloaded in pdf format.
The system is developed in two applications, one for administration, creation of reports and other that involve in give information of statistics of the previous week and reports to download, besides a section for registration of online complaints which objective is satisfy with statistics, and indicate how many complaints have been made in the police station
Fractional transformation-based decentralized robust control of a coupled-tank system for industrial applications
Petrochemical and dairy industries, waste management, and paper manufacturing fall
under the category of process industries where flow and liquid control are essential. Even when
liquids are mixed or chemically treated in interconnected tanks, the fluid and flow should constantly
be observed and controlled, especially when dealing with nonlinearity and imperfect plant models.
In this study, we propose a nonlinear dynamic multiple-input multiple-output (MIMO) plant model.
This model is then transformed through linearization, a technique frequently utilized in the analysis
and modeling of fractional processes, and decoupling for decentralized fixed-structure H-infinity
robust control design. Simulation tests based on MATLAB and SIMULINK are subsequently executed.
Numerous assessments are conducted to evaluate tracking performance, external disturbance re jection, and plant parameter fluctuations to gauge the effectiveness of the proposed model. The
objective of this work is to provide a framework that anticipates potential outcomes, paving the way
for implementing a reliable controller synthesis for MIMO-connected tanks in real-world scenarios.This research was partially funded by FONDECYT grant number 1200525 (V.L.) from
the National Agency for Research and Development (ANID) of the Chilean government under the
Ministry of Science, Technology, Knowledge, and Innovation; and by Portuguese funds through the
CMAT—Research Centre of Mathematics of University of Minho—within projects UIDB/00013/2020
and UIDP/00013/2020 (C.C.)
Constraints on Hidden Sector Gaugino Condensation
We study the phenomenology of a class of models describing modular invariant
gaugino condensation in the hidden sector of a low-energy effective theory
derived from the heterotic string. Placing simple demands on the resulting
observable sector, such as a supersymmetry-breaking scale of approximately 1
TeV, a vacuum with properly broken electroweak symmetry, superpartner masses
above current direct search limits, etc., results in significant restrictions
on the possible configurations of the hidden sector.Comment: 33 pages, 10 figures. Full postscript also available from
http://phyweb.lbl.gov/theorygroup/papers/44305.p
Phenomenological Aspects of Heterotic Orbifold Models at One Loop
We provide a detailed study of the phenomenology of orbifold
compactifications of the heterotic string within the context of supergravity
effective theories. Our investigation focuses on those models where the soft
Lagrangian is dominated by loop contributions to the various soft supersymmetry
breaking parameters. Such models typically predict non-universal soft masses
and are thus significantly different from minimal supergravity and other
universal models. We consider the pattern of masses that are governed by these
soft terms and investigate the implications of certain indirect constraints on
supersymmetric models, such as flavor-changing neutral currents, the anomalous
magnetic moment of the muon and the density of thermal relic neutralinos. These
string-motivated models show novel behavior that interpolates between the
phenomenology of unified supergravity models and models dominated by the
superconformal anomaly.Comment: 47 pages, 14 figure
Statistical characterization of vaccinated cases and deaths due to COVID-19: methodology and case study in South America
Many studies have been performed in different regions of the world as a result of the COVID-19 pandemic. In this work, we perform a statistical study related to the number of vaccinated cases and the number of deaths due to COVID-19 in ten South American countries. Our objective is to group countries according to the aforementioned variables. Once the groups of countries are built, they are characterized based on common properties of countries in the same group and differences between countries that are in different groups. Countries are grouped using principal component analysis and K-means analysis. These methods are combined in a single procedure that we propose for the classification of the countries. Regarding both variables, the countries were classified into three groups. Political decisions, availability of resources, bargaining power with suppliers and health infrastructure among others are some of the factors that can affect both the vaccination process and the timely care of infected people to avoid death. In general, the countries acted in a timely manner in relation to the vaccination of their citizens with the exception of two countries. Regarding the number of deaths, all countries reached peaks at some point in the study period
Searching for non-Gaussianity in the VSA data
We have tested Very Small Array (VSA) observations of three regions of sky
for the presence of non-Gaussianity, using high-order cumulants, Minkowski
functionals, a wavelet-based test and a Bayesian joint power
spectrum/non-Gaussianity analysis. We find the data from two regions to be
consistent with Gaussianity. In the third region, we obtain a 96.7% detection
of non-Gaussianity using the wavelet test. We perform simulations to
characterise the tests, and conclude that this is consistent with expected
residual point source contamination. There is therefore no evidence that this
detection is of cosmological origin. Our simulations show that the tests would
be sensitive to any residual point sources above the data's source subtraction
level of 20 mJy. The tests are also sensitive to cosmic string networks at an
rms fluctuation level of (i.e. equivalent to the best-fit observed
value). They are not sensitive to string-induced fluctuations if an equal rms
of Gaussian CDM fluctuations is added, thereby reducing the fluctuations due to
the strings network to rms . We especially highlight the usefulness
of non-Gaussianity testing in eliminating systematic effects from our data.Comment: Minor corrections; accepted for publication to MNRA
Dynamic Edematous Response of the Human Heart to Myocardial Infarction Implications for Assessing Myocardial Area at Risk and Salvage
BACKGROUND: Clinical protocols aimed to characterize the post-myocardial
infarction (MI) heart by cardiac magnetic resonance (CMR) need to be
standardized to take account of dynamic biological phenomena evolving
early after the index ischemic event. Here, we evaluated the time course
of edema reaction in patients with ST-segment-elevation MI by CMR and
assessed its implications for myocardium-at-risk (MaR) quantification
both in patients and in a large-animal model.
METHODS: A total of 16 patients with anterior ST-segment-elevation MI
successfully treated by primary angioplasty and 16 matched controls were
prospectively recruited. In total, 94 clinical CMR examinations were
performed: patients with ST-segment-elevation MI were serially scanned
(within the first 3 hours after reperfusion and at 1, 4, 7, and 40
days), and controls were scanned only once. T2 relaxation time in the
myocardium (T2 mapping) and the extent of edema on T2-weighted short-tau
triple inversion-recovery (ie, CMR-MaR) were evaluated at all time
points. In the experimental study, 20 pigs underwent 40-minute
ischemia/reperfusion followed by serial CMR examinations at 120 minutes
and 1, 4, and 7 days after reperfusion. Reference MaR was assessed by
contrast-multidetector computed tomography during the index coronary
occlusion. Generalized linear mixed models were used to take account of
repeated measurements.
RESULTS: In humans, T2 relaxation time in the ischemic myocardium
declines significantly from early after reperfusion to 24 hours, and
then increases up to day 4, reaching a plateau from which it decreases
from day 7. Consequently, edema extent measured by T2-weighted short-tau
triple inversion-recovery (CMR-MaR) varied with the timing of the CMR
examination. These findings were confirmed in the experimental model by
showing that only CMR-MaR values for day 4 and day 7 postreperfusion,
coinciding with the deferred edema wave, were similar to values measured
by reference contrast-multidetector computed tomography.
CONCLUSIONS: Post-MI edema in patients follows a bimodal pattern that
affects CMR estimates of MaR. Dynamic changes in
post-ST-segment-elevation MI edema highlight the need for
standardization of CMR timing to retrospectively delineate MaR and
quantify myocardial salvage. According to the present clinical and
experimental data, a time window between days 4 and 7 post-MI seems a
good compromise solution for standardization. Further studies are needed
to study the effect of other factors on these variables.This study was partially supported by a competitive grant from the
Spanish Society of Cardiology (Proyectos de Investigacion Traslacional
en Cardiologia de la Sociedad Espanola de Cardiologia 2015, for the
project Caracterizacion tiSUlar miocaRdica con resonancia magnetica en
pacientes tras inFarto agudo de mioCardio con elevacioN de ST sometidos
a angloplastia Coronaria primaria. Estudio SURF-CNIC), by a competitive
grant from the Carlos III Institute of Health-Fondo de Investigacion
Sanitaria- and the European Regional Development Fund (ERDF/FEDER)
(PI10/02268 and PI13/01979), the Spanish Ministry of economy, industry,
and competitiveness (MEIC) and ERDF/FEDER SAF2013-49663-EXP. Dr
Fernandez-Jimenez holds a FICNIC fellowship from the Fundacio Jesus
Serra, the Fundacion Interhospitalaria de Investigacion Cardiovascular,
and the Centro Nacional de Investigaciones Cardiovasculares Carlos III
(CNIC), and Dr Aguero is a FP7-PEOPLE-2013-ITN-Cardionext fellow. This
study forms part of a Master Research Agreement between the CNIC and
Philips Healthcare, and is part of a bilateral research program between
Hospital de Salamanca Cardiology Department and the CNIC. This research
program is part of an institutional agreement between FIIS-Fundacion
Jimenez Diaz and CNIC. The CNIC is supported by the MEIC and the Pro
CNIC Foundation, and is a Severo Ochoa Center of Excellence (MEIC award
SEV-2015-0505).S
Theory-Motivated Benchmark Models and Superpartners at the Tevatron
Recently published benchmark models have contained rather heavy
superpartners. To test the robustness of this result, several benchmark models
have been constructed based on theoretically well-motivated approaches,
particularly string-based ones. These include variations on anomaly and
gauge-mediated models, as well as gravity mediation. The resulting spectra
often have light gauginos that are produced in significant quantities at the
Tevatron collider, or will be at a 500 GeV linear collider. The signatures also
provide interesting challenges for the LHC. In addition, these models usually
account for electroweak symmetry breaking with relatively less fine-tuning than
previous benchmark models.Comment: 44 pages, 4 figures; some typos corrected. Revisions reflect
published versio
DIAGNÓSTICO DE LESIONES BUCALES EN ALGUNAS LOCALIDADES DE PORTOVIEJO, ECUADOR
Oral cancer is a global health problem with increasing incidence and mortality rates, which is why screening programs have been implemented for the population in some countries. On the other hand, the presence of the most relevant risk factors for these diseases in the population of Manabi Province, Ecuador is recognized, especially the consumption of alcoholic beverages, smoking, high insolation, characteristic of the region as a protective factor of these pathologies. The objective of the work was to diagnose oral lesions in some localities of Portoviejo, Ecuador. An exploratory descriptive epidemiological study was carried out during the period 2013 to 2016. The study population in the first stage was the general population of the parishes of 18 de Octubre, Riochico, San Placido, Crucita, Colón, of the San Pablo sector, of the military fort Manabí, Ecuador, and the dental clinics of the Universidad San Gregorio de Portoviejo. The most relevant risk factors for the population studied were the consumption of alcoholic beverages, smoking, sun exposure and the use of ill-fitting prostheses. The diagnostic results of the studied population show leukoplakia with 29 cases and squamous cell carcinoma of the oral cavity with nine cases. It is concluded that the high prevalence of lesions such as oral cancer found shows the importance of including the systematic examination of the oral cavity in dental practice, a fact that can drastically reduce the incidence and prevalence of oral cancer.El cáncer bucal es un problema de salud global con una incidencia y tasas de mortalidad en aumento por lo cual se han implementado programas de cribaje para la población en algunos países. Por otra parte, es reconocida la presencia de los factores de riesgo de mayor relevancia para estas enfermedades en la población de la Provincia Manabí, Ecuador especialmente el consumo de bebidas alcohólicas, el hábito de fumar, la alta insolación, característica de la región como factor protector de estas patologías. El objetivo del trabajo fue diagnosticar lesiones bucales en algunas localidades de Portoviejo, Ecuador. Se realizó un estudio epidemiológico descriptivo exploratorio, durante el período 2013 hasta 2016. La población de estudio en la primera etapa fueron la población general de las parroquias 18 de Octubre, Riochico, San Plácido, Crucita, Colón, del sector San Pablo, del fuerte militar Manabí, Ecuador y de las clínicas odontológicas de la Universidad San Gregorio de Portoviejo. Se identificaron como factores de riesgo más relevantes, para la población estudiada, el consumo de bebidas alcohólicas, el hábito de fumar, la exposición solar y el uso de prótesis mal ajustadas. Los resultados diagnósticos de la población estudiada muestran la leucoplasia con 29 casos y Carcinoma epidermoide de cavidad bucal en nueve casos. Se concluye que la alta prevalencia de lesiones como de cáncer bucal hallada muestran la importancia de incluir en la práctica odontológica el examen sistemático de la cavidad oral, hecho que puede disminuir drásticamente la incidencia y prevalencia del cáncer bucal
QUIJOTE scientific results -- XIII. Intensity and polarization study of supernova remnants in the QUIJOTE-MFI wide survey: CTB 80, Cygnus Loop, HB 21, CTA 1, Tycho and HB 9
We use the new QUIJOTE-MFI wide survey (11, 13, 17 and 19 GHz) to produce
spectral energy distributions (SEDs), on an angular scale of 1 deg, of the
supernova remnants (SNRs) CTB 80, Cygnus Loop, HB 21, CTA 1, Tycho and HB 9. We
provide new measurements of the polarized synchrotron radiation in the
microwave range. For each SNR, the intensity and polarization SEDs are obtained
and modelled by combining QUIJOTE-MFI maps with ancillary data. In intensity,
we confirm the curved power law spectra of CTB 80 and HB 21 with a break
frequency at 2.0 GHz and 5.0 GHz
respectively; and spectral indices respectively below and above the spectral
break of and for CTB 80, and and
for HB 21. In addition, we provide upper limits on the Anomalous
Microwave Emission (AME), suggesting that the AME contribution is negligible
towards these remnants. From a simultaneous intensity and polarization fit, we
recover synchrotron spectral indices as flat as , and the whole sample
has a mean and scatter of . The polarization fractions have a
mean and scatter of \%. When combining our results with the
measurements from other QUIJOTE studies of SNRs, we find that radio spectral
indices are flatter for mature SNRs, and particularly flatter for CTB 80
() and HB 21 (). In addition, the
evolution of the spectral indices against the SNRs age is modelled with a
power-law function, providing an exponent and amplitude
(normalised at 10 kyr), which are conservative with respect to
previous studies of our Galaxy and the Large Magellanic Cloud.Comment: 33 pages, 15 figure, 15 tables. Submitted to MNRAS. QUIJOTE data maps
available at https://research.iac.es/proyecto/quijot
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