Niveles de severidad de las fallas en el pavimento articulado de la Av. Huáscar, Av. Manco Cápac, Av. Pachacútec y Av. Wiracocha del complejo Qhapac Ñan, Cajamarca 2016

RESUMEN La presente tesis tuvo como objetivo evaluar los niveles de severidad de las fallas del pavimento articulado de las vías del complejo Qhapac Ñan, específicamente Av. Huáscar, Av. Manco Cápac, Av. Pachacútec y Av. Wiracocha, usando, para su evaluación, el catálogo denominado “PATOLOGÍAS DEL PAVIMENTO ARTICULADO”, elaborado por los ingenieros Carlos Hernando Higuera Sandoval y Óscar Fabián Pacheco Merchán, de la Universidad de Medellín, Colombia. Según el expediente técnico la estructura del pavimento articulado de las vías del Qhapac Ñan ya especificadas posee, generalmente, una capa de adoquines de 8 cm de alto, una cama de arena de 5 cm de alto, una base granular de 25 cm de alto y una geomalla biaxial que separa a la base granular de la subrasante. Las variables evaluadas fueron las fallas presentes en el pavimento articulado de las vías del complejo Qhapac Ñan y el nivel de severidad de cada una de ellas. Para la toma de datos se usaron formatos de recolección de datos en los cuales figuraba la clasificación de cada tipo de falla, el grado de severidad y él área afectada por cada tipo. Al tener los datos tomados en campo, se procede con el trabajo de gabinete, que consistió en organizarlos según los tipos de falla, área de la falla respecto al área total, la cantidad de cada tipo de fallas de cada tramo analizado y los niveles de severidad. Se concluye que las fallas principales son deformaciones (abultamiento, ahuellamiento y depresiones) con un área de 153.460 metros cuadrados y desprendimientos (desgaste superficial y pérdida de arena) con un área de 272.580 metros cuadrados y su evaluación mediante el catálogo denominado “Patologías del pavimento articulado” indica un nivel alto de severidad, lo cual difiere con la hipótesis que indica un nivel de severidad medio. PALABRAS CLAVE: Pavimento articulado, fallas, severidad

Maternal outcomes and risk factors for COVID-19 severity among pregnant women.

Pregnant women may be at higher risk of severe complications associated with the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which may lead to obstetrical complications. We performed a case control study comparing pregnant women with severe coronavirus disease 19 (cases) to pregnant women with a milder form (controls) enrolled in the COVI-Preg international registry cohort between March 24 and July 26, 2020. Risk factors for severity, obstetrical and immediate neonatal outcomes were assessed. A total of 926 pregnant women with a positive test for SARS-CoV-2 were included, among which 92 (9.9%) presented with severe COVID-19 disease. Risk factors for severe maternal outcomes were pulmonary comorbidities [aOR 4.3, 95% CI 1.9-9.5], hypertensive disorders [aOR 2.7, 95% CI 1.0-7.0] and diabetes [aOR2.2, 95% CI 1.1-4.5]. Pregnant women with severe maternal outcomes were at higher risk of caesarean section [70.7% (n = 53/75)], preterm delivery [62.7% (n = 32/51)] and newborns requiring admission to the neonatal intensive care unit [41.3% (n = 31/75)]. In this study, several risk factors for developing severe complications of SARS-CoV-2 infection among pregnant women were identified including pulmonary comorbidities, hypertensive disorders and diabetes. Obstetrical and neonatal outcomes appear to be influenced by the severity of maternal disease

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements