Reaction fronts in inclined tubes under a Poiseuille flow

Reaction fronts of chemical activity propagate with velocities that depend on the angle of inclination of the container. Buoyancy forces due to changes in chemical composition across the front will affect the velocity and shape of the front. If an external Poiseuille flow is imposed, the conditions of propagation would also change depending on the strength of this flow. Fronts in vertical tubes can change from flat to nonaxisymmetric, and then to axisymmetric as the density gradient is increased. Imposing a Poiseuille flow or tilting the tube changes how this sequence takes place. In this paper, we study the combined effects of convection and forced Poiseuille flow in inclined tubes, solving numerically the reaction-diffusion equations coupled to the Navier- Stokes equations

Environmental Law Updates

En este trabajo de investigación, se llevó a cabo un exhaustivo análisis sobre el problema de la localización en interiores (indoor). Existen diversas tecnologías que nos pueden ayudar a determinar la localización en interiores, en nuestro caso decidimos usar beacons marca Estimote que son transmisores Bluetooth de Baja Energía (BLE) que emiten señales broadcast (Es la transmisión de datos que serán recibitos por toda la red), a su vez decidimos diseñar un perceptrón múltiple capa a ser entrenado por la regla delta generalizada backpropagation (Propagación hacia atrás de errores o retropropagación) encargado de procesar la data RSSI (Received Signal Strength Indication) de los Beacons captada por el dispositivo móvil y de esta forma determinar la zona en la que nos posicionamos. Nuestras pruebas demostrarán que nuestra localización en interiores (indoor) alcanzará una presión que se encuentre entre los 1 y 4 metros tal y como lo estipula el fabricante

Application of the entropy of approximation for the nonlinear characterizationin patients with Chagas disease

Chagas disease American trypanosomiasis is caused by a flagellated parasite: Trypanosoma cruzi, transmitted by an insect of the genus Triatoma and also by blood transfusions. In Latin America, the number of infected people is approximately 6 million, with a population exposed to the risk of infection of 550000. It is our interest to develop a non-invasive and low-cost methodology, capable of detecting any early cardiac alteration that also allows us to see dysautonomia or dysfunction within 24 hours and with this it could be used to detect any cardiac alteration caused by T early Cruzi. For this, we analyzed the 24-hour Holter ECG records in 107 patients with ECG abnormalities (CH2), 102 patients without ECG alterations (CH1) who had positive serological results for Chagas disease and 83 volunteers without positive serological results for Chagas disease (CONTROL). Approximate entropy was used to quantify the regularity of electrocardiograms (ECG) in the three groups. We analyzed 288 ECG segments per patient. Significant differences were found between the CONTROL-CH1, CONTROL-CH2 and CH1-CH2 groups.Postprint (published version