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ARPN Journal of Engineering and
Applied Sciences December
2009 | Vol. 4 No. 10 |
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Title: |
Evaluation
of water poverty index in Ondo State, Nigeria |
Author (s): |
Olotu
Yahaya, Akinro A. O., Mogaji Kehinde O. and B. Ologunagba |
Abstract: |
An increasing world
population exerts a continually growing demand on usable freshwater
resource and matching the demand with supply of safe drinking water has
resulted to serious social-economic constraints. Time and drudgery
involved to access safe drinking resulted to loss of human capital, thus
affects nearly every household activity. This paper focuses on the
evaluation of Water Poverty Index (WPI) as an integrated tool veritable
for all the local government areas in Ondo State of Nigeria to address
their water sector. Simple time analysis and composite index approaches
were employed to compute WPI values in all the sampled areas. Variables
such as water resource, access to safe water, use of water and
environmental impacts were considered. The ranking of WPI values from
the two approaches shows that Ese-Odo is the most water-stressed with
least WPI values of 10.1 points (composite index) and highest value of
1.4minsl-1 (simple time analysis), while Owo, Ondo-West and Ose local
government areas are less water stressed with WPI values of 0.55 minsl-1,17.8;
0.53 minsl-1,16.2; and 0.5 minsl-1,17.1
respectively. The results obtained indicate that constructive investment
in water and sanitation improves Human Development Index (HDI). However,
this paper concludes that to prevent the occurrence of virtual water
situation and improve water supply, researches of this nature should be
conducted from time to time and government at all levels should
holistically address the problem. |
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Title: |
Robust minimum variance controller using
over-parameterized controller |
Author (s): |
M. M. Al-Imam and M. M. Mustafa |
Abstract: |
In this article, a
robust, stable and fast calculable controller that reduces the variance
to the minimum for minimal and non-minimal phase Linear Time Invariant (LTI)
system is proposed. The calculation is based on an algorithm that
overcomes the complexity of conventional methods. The algorithm utilizes
Diophantine Equation to obtain over- parameterized transfer function
polynomial forms that contribute to the variance reduction. It
analytically proves that increasing the order of the parameterized
controller’s coefficients makes the variance converge to the minimum,
while maintaining the same simplicity of calculation. Simulated examples
for different LTI models support our findings. |
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Title: |
The characteristics of brazed plate heat
exchangers with different chevron angles |
Author (s): |
M. Amala Justus Selvam, Senthil Kumar P
and S. Muthuraman |
Abstract: |
Experiments to measure
the condensation heat transfer coefficient and the pressure drop in
brazed plate heat exchangers (BPHEs) were performed with the
refrigerants R410A and R22. Brazed plate heat exchangers with different
chevron angles of 45_, 35_, and 20_ were used. Varying the mass flux,
the condensation temperature, and the vapor quality of the refrigerant,
we measured the condensation heat transfer coefficient and the pressure
drops. Both the heat transfer coefficient and the pressure drop
increased proportionally with the mass flux and the vapor quality and
inversely with the condensation temperature and the chevron angle.
Correlations of the Nusselt number and the friction factor with the
geometric parameters are suggested for the tested BPHEs. |
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Title: |
Influence of wall properties on the
peristaltic motion of a Herschel-Bulkley fluid in a channel |
Author (s): |
G. C. Sankad and G.
Radhakrishnamacharya |
Abstract: |
Peristaltic motion of a
Herschel-Bulkley fluid in a two-dimensional channel with wall effects is
studied. Assuming that the wave length of the peristaltic wave is large
in comparison to the mean half width of the channel, a perturbation
method of solution is obtained in terms of wall slope parameter, under
dynamic boundary conditions. Closed form expressions are derived for the
stream function and average velocity and the effects of pertinent
parameters on these flow variables have been studied. It has been
observed that the time average velocity decreases with yield stress and
power law index. Further, the time average velocity increases with
rigidity in the wall. It has been observed that trapping occurs and the
size of the trapped bolus increases with power-law index. |
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Title: |
Determination of transient and steady
state cutting in face milling operation using recurrence quantification
analysis |
Author (s): |
Shridhar D. Mhalsekar, Mohan G.,
Shrikantha S. Rao and K. V. Gangadharan |
Abstract: |
Typical face milling
operation involves transient and steady state cutting phases.
Identification and distinction of the cutting state will primarily help
in understanding the fundamentals of forced vibration, deflection and
dynamic stability in milling system at the beginning and end of a
cutting pass. Such type of investigation has advantages in process
planning, tool geometry optimization and on-line fault diagnosis. An
effort to provide estimation of transient and steady state cutting has
been made using Recurrence Quantification Analysis (RQA) of vibration
signals. RQA is a novel nonlinear analytical tool. It starts with
construction of recurrence plot using embedded dimension and time delay.
The recurrence plot is than quantified resulting in RQA. Face milling of
H11 chromium steel has been carried out at two different cutting
conditions and analysed. The resulting RQA parameters could identify and
distinguish transient and steady state cutting. |
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Title: |
Coupled finite-infinite elements modeling
of building frame-soil interaction system |
Author (s): |
Ramakant Agrawal and M. S. Hora |
Abstract: |
The soil-structure
interaction analysis of structures is a complex and broad area of
research in structural and geo-technical engineering. It deals with
study of mechanics of interaction between foundation, soil and
superstructure or its parts buried in soil to investigate the
interaction behaviour. In common structural design practice the
foundation loads from structure analysis are obtained without
considering allowance for soil settlements. The foundation settlements
are estimated assuming a perfectly flexible structure. A powerful
numerical tool like finite element method can be used to analyze the
composite system. The finite element modeling of the domain of the
building frame-soil interaction system needs variety of isoparametric
elements with different degrees of freedom. The superstructure is
discretized with conventional isoparametric elements while the soil mass
with coupled finite-infinite elements having different decay patterns to
model the far field behaviour. This paper presents the modeling of plane
frame-foundation beam-soil system for elasto-plastic interaction
analysis considering the entire system to act as a single integral
compatible structural unit using finite-infinite element. The forces in
the frame members (beams and columns) and the foundation beam have been
evaluated and compared with conventional frame analysis. |
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Title: |
Effect of in-plane forces in beam-column
junction of RC substitute frame in the linear regime |
Author (s): |
Amiya Kr. Samanta and S. Tripathi |
Abstract: |
The practicing
professionals mostly prefer to employ approximate models for the purpose
of design of a structural domain. Model based on such method ignores a
designer to evaluate the deformation pattern of the structure as a
whole, as the actual 3D problems are over-simplified into 2D problems
using line elements based on certain assumptions. Thus a designer
handles a problem keeping him in darkness in these areas, rather adopts
a conservative approach in view of quick and easy solution for the
purpose at hand. Moreover reinforcement requirement remains on much
higher side, thereby increasing hazards in detailing as well as
construction site along with overall cost of the structure. Also in
earlier days, sophisticated tools like various FEM packages were not
also available commercially and easily in the market. Hence frames
/structures were analyzed as grid structure /wire mesh. Although a wire
mess gives some idea about the deformation pattern, but it’s unable to
handle the complicated situations. It has been shown with the aid of
present study of RC substitute frame that the values of bending stresses
obtained thus are exceptionally on conservative side compared to the
analysis output using FEM package, e.g. Abaqus. Here the behaviour of a
substitute frame has been presented, following 3 different methods.
Various results obtained have been compared to assess their potentiality
and suitability in understanding true behaviour of such a system. |
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Title: |
Developing a neuro fuzzy model to predict
the properties of Alsi12 alloy |
Author (s): |
K. Srinivasulu Reddy and G. Ranga
Janardhana |
Abstract: |
The effects of
modification and vibration during solidification of Aluminum-Silicon
eutectic alloy (AlSi12) are studied and compared with unmodified alloy.
Sodium and Strontium are used as modifiers. Horizontal sinusoidal
vibration at different frequencies was imposed using a vibration Table.
It was found that modification treatment improves properties such as
ultimate tensile strength (UTS), percentage elongation, hardness,
toughness, cutting force, electrical conductivity, thermal conductivity,
fluidity, porosity and fatigue strength and optimum values were found
for sodium and strontium weight addition of modifier. Self organized
feature map (SOFM) network model is developed using Neuro Solutions
package. Genetic algorithm is used to optimize the model developed.
Further, neuro fuzzy model (CANFIS) is developed and compared the
results with neural network model developed. Sensitivity analysis is
carried out to measure the relative importance of the inputs of the
model and how the model output varies in response to variation of an
input. The developed models were validated experimentally. |
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Title: |
Using a paraffin wax-aluminum composite as
a thermal storage material in a solar air heater |
Author (s): |
Alkilani Mahmud, Sopian K., Alghoul M. A.
and Mat Sohif |
Abstract: |
This paper presents a
theoretical investigation of thermal and physical properties of a phase
change material PCM consists of paraffin wax with 5% aluminum powder,
this composite used as a thermal storage compound in a solar air heater,
the compound supposed be encapsulated in cylinders as a solar absorber
in cross flow of pumped air. An indoor simulation supposed that the PCM
initially heated by solar simulator until liquid phase temperature
(50˚C) while the pumped air over the cylinders at room temperature
(28˚C), results show that the air temperature gained due to thermal
energy discharge process decreases with increasing of air mass flow
rate, and the freezing time for this compound takes long time interval
for the lower mass flow rates. |
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Title: |
A novel algorithm to extract exact
fundamental frequency components during faults for digital protection of
power system |
Author (s): |
P. Suresh Babu, S. V. Jayaram Kumar and P.
Rohini Krishna Chaitanya |
Abstract: |
Whenever fault occurs
in power system, the operating quantities contain serious harmonics and
decaying DC in addition to fundamental frequency component. In order to
ensure better protection to the power system, protective relays must
filter their inputs to reject unwanted quantities and to retain desired
signal quantities. In addition, the decaying dc and higher order
harmonics seriously decreases the precision and convergence speed of
extraction of fundamental frequency signal. Accuracy and convergent
speed of filter algorithms of protective relays had received great
attention. A novel approach is proposed which combines the appropriate
analog low pass filter and modified Full Cycle Discrete Fourier
Transform (FCDFT) algorithm to remove the decaying DC from input signals
for protection. The proposed algorithm was tested for Line to Ground
faults on 345KV, 200km overhead transmission lines. Electromagnetic
Transient Program (EMTP) and Power System Computer Aided Design (PSCAD)
were used to generate fault current signals under different fault
locations and fault inception angles. The results shows that the
proposed technique accurately measures the fundamental frequency
component regardless of the characteristic frequency component as well
as the decaying dc offset components. |
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Title: |
Formalism for fuzzy automation Petri Nets
to Ladder Logic Diagrams |
Author (s): |
P. R.Venkateswaran, Jayadev Bhat and S.
Meenatchisundaram |
Abstract: |
Process automation has
been the default standard for industries since processors are
prominently figured in the scheme of production. The significant
characteristic of Process automation is clarity in the definition of
tasks, sequence of operation and concurrency. Programmable Logic
Controllers are a set of this morphing of processors prominently favored
in the Process Automation due to its ease of use, ruggedness and low
cost. PLC, as it is abbreviated is preferred also because of most
important reason - ease of programming. Programming of PLC was started
with Ladder Logic Diagrams and in spite of other developed high level
languages plays a prominent role even today. This problem however is
recognized and programming for DES is suggested via a modified approach
called Grafcet. In this paper, a fuzzy formalism is introduced into the
modeling system as Fuzzy Automation Petri Nets (FAPN) and formal method
for conversion of this FAPN into LLD is suggested. |
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Title: |
Implementation of echo state neural
network for single point tool wear estimation using hybrid aluminum
silicon carbide metal matrix composite |
Author (s): |
M. Kathirvel, K. Palanikumar and S.
Muthuraman |
Abstract: |
In this research work,
estimation of tool wear for the CBN / PCD tool has been done by using
Echostate neural network during machining of Al6061 metal matrix
composite. AN estimation percentage of 90.62% has been achieved. |
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