Searcharxiv⌕ Search

arXiv subjects

F. Quiñonez

Publications and source records attributed to F. Quiñonez.

3 recordsLinked to original sources
arXiv2020

sPad of Super Accuracy and Geometry in Old Babylon. -- sPad de Súper Exactitud y Geometría en la Antigua Babilonia

Recently it has been discovered that on a stone tablet over 3800 years old, the Plimpton-322 table, are carved the geometric relations that exist between the sides of 15 right triangles chosen in a very special way. Due to its property as a super accuracy calculation tool, in this work we have called it sPad by stone pad, and we have calculated its machine accuracy $ε_m$. Additionally, we present the physical and astrophysical constants most used in science and engineering in sexagesimal base. ----- Reciéntemente se ha descubierto que en una tableta de piedra de más de 3800 años de antigüedad, la Tabla Plimpton 322, están ta\-lla\-das las relaciones geométricas que existen entre los lados de 15 triángulos rectángulos escogidos de manera muy especial. Debido a su propiedad como herramienta de cálculo súper preciso, en este trabajo la hemos llamado sPad por \emph{stone pad}, y hemos calculado su exactitud de máquina $ε_{m}$. Adicionalmente presentamos las constantes físicas y astrofísicas más usadas en ciencia e ingeniería en base sexagesimal.

math.HO↗
arXiv2019

Radiation Dose Charts for Long Geodetic and Polar Flights with CARI-7A

We have calculated by using CARI-7A the effective and ambient radiation doses absorbed by a reference human phantom inside aircrafts with cruise speed, and averaged ascent/descent rates as presented by real airplanes such as: Airbus 380, Boeing 777, 787, Hercules C-130 and Twin Otter DHC-6, in a sample of flight aerial routes in a range of flight levels. In the sample, fifteen routes are between the longest non-stop flight around the world, where four flights pass over the Arctic and we have considered one air route involving the Antarctica with two additional special cases. The Earth curvature based on model WGS84 was taken into account for every point in each route by using the INVERSE3D software. Then we constructed radiation dose charts according to the ICRP-103 conditions by using the radiometric results coming from the CARI-7A simulations. These charts present the effective absorbed radiation dose as a function of flight level and flight time in a year of normal operations of the crew as recommended by the FAA. We have also characterized geographically and kinematically the cosmic effective radiation absorption rates at Earth's atmosphere in terms of the structure and order of polynomials in the altitude. From the flight with the leading rate of irradiation we found a thumb rule to estimate the effective absorbed radiation dose and the ambient equivalent dose that gives a superior threshold for any flight of the sample and perhaps on Earth, valid in altitude interval [20000, 50000] ft.

physics.med-ph↗