541 research outputs found
Three-dimensional particle size and position measurement by linear complex amplitude Wiener filtering; 35473233
Digital in-line holography (DIH) combined with a Wiener filter has been applied to measure particle size and position in the flow inside a capillary model, seeded with magnetic particles (3µm) and with solid opaque particles that simulated red and white cells. The proposed filtering process takes advantage of the linearity implicit in the numerical reconstruction of the object complex amplitude. A modified DIH set-up, with a tilted illumination beam, was used as it presents two main advantages: it solves the twin image issue associated to in-line holography and increases the out-of-plane resolution. Experiments show that the proposed method discriminates particles within a range from 3 to 30µm with a sensitivity of 0.5µm. © 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreemen
Depression symptoms and mortality in elderly peruvian navy veterans: a retrospective cohort study
Abstract: Our study was design to determine the association between depressive symptoms and mortality in adults over 60 years old Navy Peruvian Veterans. We performed a retrospective cohort study based on a previous cohort study. A total of 1681 patients over 60 years old were included between 2010–2015. Demographic information, self-reported information about falls, physical frailty assessment, tobacco consumption, hypertension, Type 2 Diabetes Mellitus, Chronic Obstructive Pulmonary Disease and was collected. Depression was assessed by the short form of the Geriatric Depression Scale. We found that depressive symptoms were present in 24.9% of the participants and 40.5% of them died. Mortality risk in patients with depressive symptoms, physical frailty, and male sex was: RR of 23.1 (95% CI: 11.7–45.7), 3.84 (95% CI: 2.16–6.82), and 1.37 (95% CI: 1.07–1.75) respectively. We concluded that depressive symptoms in Peruvian retired military personnel and their immediate relatives are high and are significatively associated with mortality. Also, being male and frail was associated with an increased risk of death. This reinforces that early detection and assessment of depressive symptoms could be an opportunity to improve the health status of older adults
DISEÑO DEL PULSO ÓPTIMO DE RIEGO EN EL CULTIVO DE FRESA CON EL MODELO NUMÉRICO HYDRUS 2D
[ES] El cultivo intensivo de fresa, que se desarrolla en macrotúneles de plástico sobre
lomos acolchados, demanda volúmenes importantes de agua para satisfacer las
necesidades hídricas del cultivo así como para labores de preparación del suelo o alomado
y riego de apoyo en la fase de plantación. El riego de la fresa es especialmente complejo
dado que es un cultivo que se produce bajo plástico en suelos muy arenosos (habitualmente
con un contenido de arena superior al 90%), con escasa capacidad de retención de agua. A
pesar de esta dificultad, no es habitual que exista una programación del riego basada en la
medida de las principales variables que afectan al cálculo de las necesidades hídricas del
cultivo. En este trabajo se proponen medidas de mejora en el manejo del riego, basadas en
la determinación del pulso óptimo que evite las pérdidas por percolación en tres fases de
desarrollo del cultivo. Para ello se ha utilizado el modelo de simulación del movimiento del
agua en el suelo Hydrus 2D. Se han simulado diferentes estrategias de riego para aplicar la
ETc del cultivo con emisores de 5 l.h-1.m en tres etapas diferentes del cultivo, inicio,
mediados, y final de campaña y en las que por término medio se necesitan tiempos de riego
que oscilan entre los 10-20 minutos al inicio de la campaña y 40-60 minutos al final de
campañaGarcía Morillo, J.; Rodríguez-Díaz, J.; Martín Arroyo, M.; Camacho Poyato, E.; Montesinos Barrios, P. (2015). DISEÑO DEL PULSO ÓPTIMO DE RIEGO EN EL CULTIVO DE FRESA CON EL MODELO NUMÉRICO HYDRUS 2D. En XXXIII CONGRESO NACIONAL DE RIEGOS. Valencia 16-18 junio de 2015. Editorial Universitat Politècnica de València. https://doi.org/10.4995/CNRiegos.2015.1472OC
The scope of language contact as a constraint factor in language change: The periphrasis haber de plus infinitive in a corpus of language immediacy in modern Spanish
In this work an empirical study grounded in the principles and methods of the comparative variationist framework is conducted to measure the scope of language contact as a factor constraining some potentially diverging uses of a Spanish verbal periphrasis that has undergone a sharp decline over the last century (haber de plus infinitive). The analysis is based on three independent samples of text that correspond to three dialectal areas of peninsular Spanish (monolingual zones, Catalan-speaking linguistic territories and the north-western linguistic area). These samples, extracted from a corpus made up of texts of communicative immediacy from the 19th and the first half of the 20th centuries, confirm the existence of a certain linguistic convergence in the expressive habits of the speakers in the bilingual communities. In each region, however, the outcomes are different, due to parallel differences in the structural position of the periphrasis in each language. However, a thorough analysis of the variable context that surrounds the periphrasis shows that the observed differences do not affect the essence of the underlying grammar of this variant, whose decline (which favours tener que plus infinitive and becomes faster as the 20th century advances) is constrained by identical linguistic and extralinguistic conditioning factors in all the dialectal areas
EL RIEGO DE PRECISIÓN EN EL CULTIVO DE FRESA EN LA PROVINCIA DE HUELVA
[ES] El cultivo de fresa es el cultivo con mayor repercusión económica y social de la
provincia de Huelva, ya que España es el principal productor de fresa fresca de Europa y el
segundo del mundo, situándose el 95% de esa producción en la provincia de Huelva. Sin
embargo, la zona donde se desarrolla el cultivo, el entorno del Parque Nacional de Doñana,
es una de las zonas de mayor sensibilidad ambiental de Europa y cualquier actividad que se
desarrolle debe evitar impactos negativos en el mismo. De lo anterior se deduce la
necesidad de buscar un equilibrio para que agricultura y medio ambiente puedan convivir en
el entorno de Doñana. Este trabajo se centra precisamente en eso, en optimizar el uso del
agua en la zona mediante la implantación del riego de precisión en el cultivo de fresa, que
consiste en dar a la planta el agua que necesita en el momento adecuado. La implantación
de un sistema de riego de precisión se ha llevado a cabo en la campaña 2013/2014 en una
finca comercial de la zona Almonte-El Rocío, provincia de Huelva. Para ello se ha
implantado un ensayo en 5 sectores distintos, cada uno con un tipo de emisor diferente, en
el que se realizó una programación óptima del riego basada en el cálculo de las
necesidades teóricas del cultivo, el análisis hidráulico del sector y el movimiento del agua en
el suelo, y cuyo comportamiento se comparó con un sector testigo manejado por el
agricultor. Estas técnicas permitieron ahorrar un 43% de agua, en las condiciones
particulares de suelo, variedad y configuración de la red riego de la finca de ensayo,
obteniéndose un ligero aumento de producción respecto al manejo tradicional del agricultor,
lo que se tradujo en un incremento de la rentabilidad del cultivo y de una mejora de la
sostenibilidad en la producción intensiva de fresas.Martín Arroyo, M.; Fernandez García, I.; Gonzalez Perea, R.; García Morillo, J.; Rodríguez Díaz, J.; Camacho Poyato, E.; Montesinos Barrios, P. (2015). EL RIEGO DE PRECISIÓN EN EL CULTIVO DE FRESA EN LA PROVINCIA DE HUELVA. En XXXIII CONGRESO NACIONAL DE RIEGOS. Valencia 16-18 junio de 2015. Editorial Universitat Politècnica de València. https://doi.org/10.4995/CNRiegos.2015.1462OC
Measurement of the Crab Nebula Spectrum Past 100 TeV with HAWC
We present TeV gamma-ray observations of the Crab Nebula, the standard
reference source in ground-based gamma-ray astronomy, using data from the High
Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory. In this analysis we use
two independent energy-estimation methods that utilize extensive air shower
variables such as the core position, shower angle, and shower lateral energy
distribution. In contrast, the previously published HAWC energy spectrum
roughly estimated the shower energy with only the number of photomultipliers
triggered. This new methodology yields a much improved energy resolution over
the previous analysis and extends HAWC's ability to accurately measure
gamma-ray energies well beyond 100 TeV. The energy spectrum of the Crab Nebula
is well fit to a log parabola shape with emission up to at least 100 TeV. For the first
estimator, a ground parameter that utilizes fits to the lateral distribution
function to measure the charge density 40 meters from the shower axis, the
best-fit values are
=(2.350.04)10 (TeV cm
s), =2.790.02, and
=0.100.01. For the second estimator, a neural
network which uses the charge distribution in annuli around the core and other
variables, these values are
=(2.310.02)10 (TeV cm
s), =2.730.02, and
=0.060.010.02. The first set of uncertainties are statistical;
the second set are systematic. Both methods yield compatible results. These
measurements are the highest-energy observation of a gamma-ray source to date.Comment: published in Ap
Very high energy particle acceleration powered by the jets of the microquasar SS 433
SS 433 is a binary system containing a supergiant star that is overflowing
its Roche lobe with matter accreting onto a compact object (either a black hole
or neutron star). Two jets of ionized matter with a bulk velocity of
extend from the binary, perpendicular to the line of sight, and
terminate inside W50, a supernova remnant that is being distorted by the jets.
SS 433 differs from other microquasars in that the accretion is believed to be
super-Eddington, and the luminosity of the system is erg
s. The lobes of W50 in which the jets terminate, about 40 pc from the
central source, are expected to accelerate charged particles, and indeed radio
and X-ray emission consistent with electron synchrotron emission in a magnetic
field have been observed. At higher energies (>100 GeV), the particle fluxes of
rays from X-ray hotspots around SS 433 have been reported as flux
upper limits. In this energy regime, it has been unclear whether the emission
is dominated by electrons that are interacting with photons from the cosmic
microwave background through inverse-Compton scattering or by protons
interacting with the ambient gas. Here we report TeV -ray observations
of the SS 433/W50 system where the lobes are spatially resolved. The TeV
emission is localized to structures in the lobes, far from the center of the
system where the jets are formed. We have measured photon energies of at least
25 TeV, and these are certainly not Doppler boosted, because of the viewing
geometry. We conclude that the emission from radio to TeV energies is
consistent with a single population of electrons with energies extending to at
least hundreds of TeV in a magnetic field of ~micro-Gauss.Comment: Preprint version of Nature paper. Contacts: S. BenZvi, B. Dingus, K.
Fang, C.D. Rho , H. Zhang, H. Zho
Association Between the Use of a Mobile Health Strategy App and Biological Changes in Breast Cancer Survivors: Prospective Pre-Post Study
The objectives of this study were to: (1) check whether it is feasible to find changes in inflammation biomarkers
through an mHealth strategy app as a delivery mechanism of an intervention to monitor energy balance; and (2) discover potential
predictors of change of these markers in breast cancer survivors (BCSs). Analyzing changes in inflammatory biomarker concentrations after using the mHealth app, differences between
preassessment CRP (4899.04 pg/ml; SD 1085.25) and IL-6 (87.15 pg/ml; SD 33.59) and postassessment CRP (4221.24 pg/ml;
SD 911.55) and IL-6 (60.53 pg/ml; SD 36.31) showed a significant decrease in both markers, with a mean difference of –635.25
pg/ml (95% CI –935.65 to –334.85; P<.001) in CRP and –26.61 pg/ml (95% CI –42.51 to –10.71; P=.002) in IL-6. Stepwise
regression analyses revealed that changes in global quality of life, as well as uMARS score and hormonal therapy, were possible predictors of change in CRP concentration after using the mHealth app. In the same way, the type of tumor removal surgery
conducted, as well as changes in weight and pain score, were possible predictors of change in IL-6 concentration after using the
app. In conclusion, through the results of this study, we hypothesize that there is a possible association between an
mHealth energy balance monitoring strategy and biological changes in BCSs. These changes could be explained by different
biopsychosocial parameters, such as the use of the application itself, quality of life, pain, type of tumor removal surgery, hormonal
treatment or obesity.The study was funded by the Spanish Ministry of Economy and Competitiveness (Plan Estatal de I+D+I 2013-2016), Fondo de
Investigación Sanitaria del Instituto de Salud Carlos III (PI14/01627), Fondos Estructurales de la Unión Europea (FEDER), and
by the Spanish Ministry of Education (FPU14/01069 and FPU17/00939)
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