Scipedia: Collection of Articles on Engineering

Cold Fusion by Cherenkov Radiation in a Unique Ceramic

Roshdy Barsoum — Tue, 27 Apr 2021 18:04:02 +0200

Cold Fusion can be generated by a unique Ceramic of Hydrated Alkali Aluminum Silicates (Ref. 2). We have shown that a standard battery electrolyte can be used with either Lithium or Lead batteries. Some of the major application is to generate clean energy for Unmanned Vehicles, cars and many public transportations vehicles giving them unlimited range of operations.

Investigation on the performance of ‘Fino’ materials to stabilize expansive soil: A case study in Yeka Sub-City, Addis Ababa, Ethiopia

Emer T. Quezon — Tue, 23 Feb 2021 18:48:12 +0100

Expansive soil swells when it is wet, and it will shrink when it dries. Due to this behavior of the soil, the strength and other properties of soil are inferior. To improve its properties, it is necessary to stabilize the soil with different stabilizers. Soil stabilization is a process to treat the soil to maintain, alter, or improve expansive soil performance. In this study, the potential of 'Fino' as stabilizing additive to expansive soil was investigated for the improving engineering properties of expansive soil to be used as subgrade material. The evaluation involved the determination of the Free Swell test, CBR test, Atterberg's limits, and the Proctor test of expansive soil in its natural state as well as when mixed with varying proportions of 'Fino.' The practices were performed on six proportions 5%, 10%, 15%, 20%, 25% and 30 % with expansive soil. The research result indicated a considerable reduction in Swelling, and the Maximum dry Density of soil was improved. Optimum moisture content decreased in increasing 'Fino.' At 30% of 'Fino,' the CBR values of expansive soil increased from 1.06% to 5.94%, Liquid Limit decreased from 95.2% to 29.4%, plasticity index decreased from 57.24% to 17.82% and the degree of expansion of the natural subgrade soil has reduced from 'very high to medium.' Hence, it is concluded that the 'Fino' at 30% has shown significant improvement in the expansive soil's engineering properties meeting the ERA and AASHTO Standard specifications requirements for road subgrade material.

Effect of limit equilibrium zone energy on the volume of coal and gas outburst

Jinzhang Jia — Tue, 08 Sep 2020 09:19:01 +0200

In order to study the effect of the limit equilibrium zone energy in front of the heading face on the volume of coal and gas outburst, the concept of coal-gas mixed matrix was put forward, then the width of the limit equilibrium zone was calculated, and thus the energy transformation mathematical model of the limit equilibrium zone was established through theoretical analysis and mathematical derivation. In addition, the energy density calculation formula of the limit equilibrium zone was derived and then the intensity prediction formula of coal and gas outburst was derived combining elastic energy of coal body, expansion energy of gas, crushing work and throwing work of coal body. The results showed that the energy in the limit equilibrium zone has a certain effect on the volume of coal and gas outburst and the intensity prediction formula has high accuracy in Yangou Coal Mine. These conclusions have certain guiding significance for energy calculation and intensity prediction of coal and gas outburst.

COMPACTACION DE UN SUELO CON RODILLO VIBRANTE

Javier Jenaro Mac-Lennan — Tue, 23 Oct 2018 11:33:02 +0200

Se establece una ecuación que trata una función dependiente del
espacio y el tiempo cuya aplicació resulta el desplazamiento como una
onda que discurre en un medio isó}tropo el cual ofrece una resistencia a
su paso modulada por la constante elástica o módulo de reacción
del suelo. Resolviendo la correspondiente ecuación diferencial se
obtiene la función de onda correspondiente la cual da la deformación
en cada punto del substrato, y determinando el máximo tiempo de
permanecia de la carga necesario para que se desarrolle la m\'{a}xima
deformación obtenemos el valor de consolidación de la deformación.