A Statistical Learning Regression Model Utilized To Determine Predictive Factors of Social Distancing During COVID-19 Pandemic

In an application of the mathematical theory of statistics, predictive regression modelling can be used to determine if there is a trend to predict the response variable of social distancing in terms of multiple predictor input “predictor” variables. In this study the social distancing is measured as the percentage reduction in average mobility by GPS records, and the mathematical results obtained are interpreted to determine what factors drive that response. This study was done on county level data from the state of Florida during the COVID-19 pandemic, and it is found that the most deterministic predictors are county population density along with median income

A Statistical Learning Regression Model utilized to determine predictive factors of social distancing during COVID-19 pandemic

In an application of the mathematical theory of statistics, predictive regression modeling can be used to determine if there is a trend to predict the response variable of social distancing in terms of multiple predictor input variables. In this study, the social distancing was measured as the percentage reduction in average mobility by GPS records, and the mathematical results obtained are interpreted to determine what factors drive that response. This study was done with county level data obtained from the State of Florida during the COVID-19 pandemic. The predicting factors found that were most deterministic was the county population density along with median income

MODELLING WITHIN-PLANT SPATIAL DEPENDENCIES OF COTTON YIELD

In field experiments during 1987-1990, cotton plants were grown under 8 different levels of nitrogen application to assess the impact of nitrogen fertilization on the fruiting and yield distribution of cotton within the plant (Boquet et al. 1993).lr.dividual boll weights and average seedcotton yield were determined at each fruiting site fur each main-stem node along the plant. Various models of dependence and independence are possible to explain and account for the dependencies of the yields among the sites and nodes of the plant. Here we investigate models of total yield per node and yield per node adjusted for the number of sites using several models for the spatial dependence among the nodes. Typical univariate models would either assume a simple homogeneous error structure or a compound symmetry error structure among the nodes, leading to the split-plot-type models. A multivariate unstructured approach ignores obvious spatial dependencies among the nodes. Spatial models and ante-dependence models permit a parsimonious summary of the error structure and are compared with the compound symmetry and multivariate models

Fibre optic monitoring of a deep circular excavation

This paper describes part of the monitoring undertaken at Abbey Mills shaft F, one of the main shafts of Thames Water's Lee tunnel project in London, UK. This shaft, with an external diameter of 30 m and 73 m deep, is one of the largest ever constructed in the UK and consequently penetrates layered and challenging ground conditions (Terrace Gravel, London Clay, Lambeth Group, Thanet Sand Formation, Chalk Formation). Three out of the twenty 1·2 m thick and 84 m deep diaphragm wall panels were equipped with fibre optic instrumentation. Bending and circumferential hoop strains were measured using Brillouin optical time-domain reflectometry and analysis technologies. These measurements showed that the overall radial movement of the wall was very small. Prior to excavation during a dewatering trial, the shaft may have experienced three-dimensional deformation due to differential water pressures. During excavation, the measured hoop and bending strains of the wall in the chalk exceeded the predictions. This appears to be related to the verticality tolerances of the diaphragm wall and lower circumferential hoop stiffness of the diaphragm walls at deep depths. The findings from this case study provide valuable information for future deep shafts in London. The authors would like to thank Thames Water Ltd and the Lee Tunnel Project Management Team for making the field study possible in the first place.This is the accepted manuscript. The final version is available from ICE Publishing at http://www.icevirtuallibrary.com/content/article/10.1680/geng.13.00036

Relativistic models of magnetars: structure and deformations

We find numerical solutions of the coupled system of Einstein-Maxwell's equations with a linear approach, in which the magnetic field acts as a perturbation of a spherical neutron star. In our study, magnetic fields having both poloidal and toroidal components are considered, and higher order multipoles are also included. We evaluate the deformations induced by different field configurations, paying special attention to those for which the star has a prolate shape. We also explore the dependence of the stellar deformation on the particular choice of the equation of state and on the mass of the star. Our results show that, for neutron stars with mass M = 1.4 Msun and surface magnetic fields of the order of 10^15 G, a quadrupole ellipticity of the order of 10^(-6) - 10^(-5) should be expected. Low mass neutron stars are in principle subject to larger deformations (quadrupole ellipticities up to 10^(-3) in the most extreme case). The effect of quadrupolar magnetic fields is comparable to that of dipolar components. A magnetic field permeating the whole star is normally needed to obtain negative quadrupole ellipticities, while fields confined to the crust typically produce positive quadrupole ellipticities.Comment: 25 pages, 9 figures, submitted to MNRA

Carga asociada a la administración de rivastigmina transdérmica y a su presentación oral en cuidadores de pacientes con enfermedad de Alzheimer

Introducción: La enfermedad de Alzheimer (EA) es la demencia más común en la vejez, y conlleva un elevado estrés y una importante carga familiar. Objetivo: Evaluar las diferencias en satisfacción y carga asociada a la administración de rivastigmina por vía transdérmica y oral en cuidadores de pacientes con EA. Material y métodos: Estudio observacional, transversal y multicéntrico que incluyó a cuidadores de pacientes con EA de leve a moderadamente grave tratados con rivastigmina. Se evaluó la molestia asociada a la administración, la carga soportada y la satisfacción con el tratamiento. Resultados: Se incluyeron 497 cuidadores/grupo. La edad media de los cuidadores fue de 58,1 ± 14,2 años, y cerca del 75% eran mujeres. La mayoría de cuidadores eran parientes cercanos. La dificultad para tragar la medicación supuso molestias medias o elevadas al 38,2% de los cuidadores del grupo oral, mientras que la dificultad para colocar el parche lo fue para el 4,6%. El tratamiento transdérmico alcanza molestias medias de 6,7 puntos y el oral de 10,1 (p <0,0001); la sobrecarga no mostró diferencias significativas (21,4 ± 7,2 frente a 21,5 ± 6,9, respectivamente). Respecto a la facilidad de uso, el 88,3% consideró fácil o muy fácil el parche, y el 71,2% la cápsula. La afectación de la vida del cuidador fue nula o muy ocasional en el 66,4% con tratamiento transdérmico, frente al 51,1% con tratamiento oral. El 75,1% se mostraron satisfechos con el tratamiento transdérmico, frente al 55,9% con el oral (p <0,0001). Conclusiones: Los cuidadores de pacientes con EA mostraron una mayor satisfacción con el tratamiento de rivastigmina transdérmica y menores molestias asociadas

Carga asociada a la administración de rivastigmina transdérmica y a su presentación oral en cuidadores de pacientes con enfermedad de Alzheimer

Introducción: La enfermedad de Alzheimer (EA) es la demencia más común en la vejez, y conlleva un elevado estrés y una importante carga familiar. Objetivo: Evaluar las diferencias en satisfacción y carga asociada a la administración de rivastigmina por vía transdérmica y oral en cuidadores de pacientes con EA. Material y métodos: Estudio observacional, transversal y multicéntrico que incluyó a cuidadores de pacientes con EA de leve a moderadamente grave tratados con rivastigmina. Se evaluó la molestia asociada a la administración, la carga soportada y la satisfacción con el tratamiento. Resultados: Se incluyeron 497 cuidadores/grupo. La edad media de los cuidadores fue de 58,1 ± 14,2 años, y cerca del 75% eran mujeres. La mayoría de cuidadores eran parientes cercanos. La dificultad para tragar la medicación supuso molestias medias o elevadas al 38,2% de los cuidadores del grupo oral, mientras que la dificultad para colocar el parche lo fue para el 4,6%. El tratamiento transdérmico alcanza molestias medias de 6,7 puntos y el oral de 10,1 (p <0,0001); la sobrecarga no mostró diferencias significativas (21,4 ± 7,2 frente a 21,5 ± 6,9, respectivamente). Respecto a la facilidad de uso, el 88,3% consideró fácil o muy fácil el parche, y el 71,2% la cápsula. La afectación de la vida del cuidador fue nula o muy ocasional en el 66,4% con tratamiento transdérmico, frente al 51,1% con tratamiento oral. El 75,1% se mostraron satisfechos con el tratamiento transdérmico, frente al 55,9% con el oral (p <0,0001). Conclusiones: Los cuidadores de pacientes con EA mostraron una mayor satisfacción con el tratamiento de rivastigmina transdérmica y menores molestias asociadas

Residue management in double-crop systems: Impact on soybean growth and yield

Double-crop soybeans [Glycine max(L.) Merr.] have the potential to be a productive and profitable system. However, due to delayed planting, double-crop soybeans frequently experience lower yields and higher stress. Because planting is a major production constraint, a critical practice is the management of previous wheat residue. Trials were established in 2012, 2013, and 2014 in Saint Joseph, LA, and in 2013 and 2014 in Winnsboro, LA. The four residue management treatments investigated included conventionally tilled, planted into burned residue, planted into mowed residue, and planted into standing wheat residue. Vegetative and reproductive growth parameters, as well as yield, were used to evaluate the influence of residue management on productivity. Overall, residue management did not have a significant impact on early season growth parameters, except for plant height in 2012 at St. Joseph; however, it did significantly influence yield at both locations. In Saint Joseph in 2012, yields from planting into wheat residue were significantly lower than burned and mowed plots (1.2 compared with 2.8 and 2.7 Mg ha-1, respectively), and tilled treatments yielded significantly less than all three nontilled treatments in 2013 and 2014. In Winnsboro, planting into residue left on the soil surface resulted in significantly higher yields than when residue was removed. Overall, leaving residue on the soil surface provided stable yields across years and locations; however, not managing the residue can result in diminished yields. Therefore, practices such as mowing of wheat residue prior to planting provide an alternative to traditional no-till planting.Peer reviewedPlant and Soil Science