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International Journal of Research and Reviews in Applied Sciences
ISSN: 2076-734X, EISSN: 2076-7366
Volume 22, Issue 3(March, 2015)
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1. |
OPTIMIZATION OF CONCRETE MADE WITH ABAKALIKI QUARRY DUST AS FINE AGGREGATE USING SCHEFFE’S OPTIMIZATION MODEL |
by Chijioke Chiemela, Okoye Peter C., Nwosu Pius C., Oke O. Mong & Ndubuisi Christian O. |
Abstract |
In
recent years, Nigeria has witness rapid development especially in the area of infrastructural
development like roads, bridges, buildings etc. The conventional methods used in
concrete mixing have its own peculiar problems, like time wasting, material wasting
and errors. These problems have been the cause of structural failures which has
given rise to loss of life and properties. Hence the need to development a method
that will take care of all these anomalies witness in the conventional method. This
work is aim at removing these anomalies by the use of Scheffes Optimization method.
This optimization method can predict the compressive strength of a concrete given
the mix ratios and also predict the mix ratios required to give a compressive strength
for a particular concrete made by completely replacing river sand with quarry dust.
With this method it will be easy to predict the compressive strength of concrete
based on the type of structure it is to be used for, there by eliminating the problems
associated with structural collapse due to errors in concrete mixing by conventional
method.
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Source: |
International Journal of Research and Reviews in Applied Sciences
March 2015-- Vol. 22 Issue 3-- 2015 |
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2. |
APROXIMATE SOLUTION FOR A COUPLED SYSTEM OF DIFFERENTIAL EQUATIONS ARISING FROM A THERMAL IGNITION PROBLEM |
by Sidrah Ahmed, Faqir Shah & Nadeem Salamat
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Abstract |
This article presents the approximate series solution of a coupled system of a partial
differential equations and ordinary differential equations. The couples system arises
from fast ignitig catalytic converters in automobile engineering. The homotopy analysis
method (HAM) is applied to obtain the series solution. The HAM solution contains
an auxiliary parameter which provides a convenient way of controlling the convergence
region of series solution. Results are presented for different case studies and
is compared for a case where the continuous solution is explicitly known.
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Source: |
International Journal of Research and Reviews in Applied Sciences
March 2015-- Vol. 22 Issue 3-- 2015 |
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3. |
DETERMINATION OF EQUIVALENT ELECTRIC CIRCUIT PARAMETERS OF SINGLE-PHASE POWER TRANSFORMERS WITH DIFFERENT NUMBER OF WINDING TURNS |
by Antônio Flavio Licarião Nogueira, Leonardo José Amador Salas Maldonado, Douglas Morais de Melo, Kamila Mariana Devegili & Arthur Garcia Bartsch |
Abstract |
Static
finite element solutions are used to determine the electrical equivalent circuit
parameters of a single-phase transformer with different number of winding turns
in the primary and secondary circuits. The lumped elements of the electric equivalent
circuit correspond to the various physical phenomena in the transformer. The study
introduces the sequence of operations necessary to evaluate the parameters of the
conventional T-shaped transformer equivalent circuit by means of the numerically
simulated open-circuit and bucking tests. The academic problem concerns a step-down
transformer with turns-ratio 2:1. The discussion clarifies the concepts of self-,
mutual- and total inductances of a giving winding, and how to compute them separately.
The discussion also places emphasis on the relationship between the voltage drop
on a given transformer winding and the source voltage under open-circuit and bucking
test operations.
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Source: |
International Journal of Research and Reviews in Applied Sciences
March 2015-- Vol. 22 Issue 3-- 2015 |
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