
ARPN Journal of Engineering and Applied
Sciences February
2010  Vol. 5 No. 2 


Title: 
Determination
of the concentration of ammonia that could have lethal effect on
fish pond 
Author (s): 
Joel Ogbonna
F. and Amajuoy Chinomso A. 
Abstract: 
A local fish farmer experienced high mortality
rate of fishes from his fish pond located in a city of Port
Harcourt, Nigeria. In order to ascertain the cause of the
death of these fishes, some selected physicochemical and
microbiological parameters were used to determine the
concentration which resulted in lethal effect on the fishes.
Test results indicated that among the parameters determined,
the concentration of ammonia in both the storage tank and
aquarium exceeded the maximum limit of 0.2mg/l for aquatic
life. The ammonia concentrations from test results ranged from
0.25mg/l to 0.50mg/l. The sample with 0.50mg/l also indicated
the highest level of total coliform of
3.52 x 10^{3}(cfu/100ml)
as against the sample with 0.25mg/l with Total Coliform of 0.0
(cfu/100ml). Moreover, higher values of pH (7.45), TDS
(104mg/l), Electrical conductivity (208µScm^{1}),
Chloride (75.76mg/l), Nitrate (2.00mg/l), Calcium (0.94mg/l)
respectively were seen in the sample with the highest level of
ammonia (0.5mg/l). The death of the fishes was more evident
with the sample having 0.5mg/l, followed by the sample with
0.35mg/l of ammonia. Test result therefore confirms that
ammonia concentration of above 0.20mg/l in fish ponds has a
tendency to harm the fishes. 



Title: 
Effect of
nonstandard curing methods on the compressive strength of
laterized concrete 
Author (s): 
Felix F.
Udoeyo, Robert Brooks, Christopher Utam, Philip UdoInyang and
Eno C. Ukpong 
Abstract: 
Thirty concrete mixes of
differing waterbinder ratio containing 0, 10, 20, 30, 40 and
50 % laterite as a partial replacement for sand were used to
prepare laterized concrete specimens for the study of the
effect of nonstandard curing methods on the strength of
specimen. The effectiveness of a curing method was measured
quantitatively as the ratio of the compressive strength of
specimen cured using the nonstandard method to those cursed
using the standard watercuring method specified in the
BS1881: Part 3:1970 (control). The results of the
investigation show that with continuous wetting of the
nonstandard curing media by sprinkling with water, the
strength of the concrete obtained could be comparable to those
cured using the control method. Of the four nonstandard curing
methods considered in the study it was observed that the
strength of sand and sawdustcured specimen were in some
instances the same as or higher than those of the standard
cured specimens at early age (7days). Although at later age
(28 days) there were significant differences between the
strength of specimens cured using the nonstandard methods and
those of corresponding laterite content and waterbinder ratio
cured using the control method as established by ttest, the
designed strength of 20 MPa was attained by all specimens
cured using the nonstandard methods, which is indicative that
these nonstandard methods could be used as alternative to the
standard water curing, especially in situations where much
water may not be available for curing specimens. 



Title: 
Active
control of the flow behind a backward facing step by a periodic
perturbation 
Author (s): 
Zouhaier
Mehrez, Mourad Bouterra, Afif El Cafsi, Ali Belghith and Patrick
Le Quere 
Abstract: 
In this paper
the active control of the turbulent separated and reattaching
flow over a backward facing step is studied numerically by the
Large Eddy Simulation (LES) method. The objective of the
control consists to modify the separation phenomenon of the
fluid in the edge of the step by application a periodic
perturbation. The perturbation is realized by zeronet
alternative suction and blowing of the fluid in the step edge
into a separated shear layer. The found results showed the
reduction of the reattachment length and enhancement of the
shedding vortical frequency by the applied periodic
perturbation. Also, the existence of an optimum frequency, Stp
= 0.25, in term of promotion of reattachment and the increase
of shedding vortical frequency. At this perturbation frequency
an important modification of the dynamic of the flow is
observed. The modifications observed at the optimum frequency
are noticeable as the perturbation amplitude increases. 



Title: 
Average and
instantaneous fuel consumption of Iranian conventional tractor
with moldboard plow in tillage 
Author (s): 
H.
Fathollahzadeh, H. Mobli, A. Rajabipour, S. Minaee, A. Jafari
and S.M.H. Tabatabaie 
Abstract: 
John Deere 3140 tractors work
powerful and useful in Iran farmlands now. In this study two
flow meter sensors were used for measuring tractor fuel
consumption and the measurement system was installed on diesel
engine of a 72.3KW John Deer 3140. A threeshare moldboard
plow was used for studying the effect of plow depth variations
on tractor fuel consumption. Results showed that the tractor
with the moldboard plow attached and operating at depths of
0.15, 0.25 and 0.35 m consumes 27.446, 30.096 and 34.06 liters
of fuel per hectare, respectively. Increasing plow depth from
0.15 to 0.25 and 0.15 to 0.35 m increases fuel consumption by
9.66 and 24.1%, respectively. The average fuel consumption is
30 L/ha in the common plow depth of 0.2 to 0.25 m which is
close to results reported from other parts of the world.
Instantaneous fuel consumption during operation of moldboard
plow at three depths shows increase of instantaneous fuel
consumption when working depth increases. In the farm
experiments, only working depth of plow was changed but
variations in timeconsumption diagram showed that there were
other factors affecting draft and thereby fuel consumption
during operation. 



Title: 
Fuzzy
transportation problem with additional restrictions 
Author (s): 
Debashis
Dutta and A. Satyanarayana Murthy 
Abstract: 
This paper deals with the
transportation problem with additional impurity restrictions
where costs are not deterministic numbers but imprecise ones.
Here, the elements of the cost matrix are subnormal fuzzy
intervals with strictly increasing linear membership
functions. By the MaxMin criterion suggested by Bellman and
Zadeh, the fuzzy transportation problem can be treated as
a mixed integer nonlinear programming problem. We show that
this problem can be simplified into a linear fractional
programming problem. This fractional programming problem is
solved by the method given by Kanti Swarup. 



Title: 
Investigations and study on the effect of AR glass polymer
fibres in selfcompacting selfcuring concrete 
Author (s): 
S. U. Kannan,
Selvamony C., M. S. Ravikumar and S. Basil Gnanappa 
Abstract: 
This experimental study is
exposing the relationship between permeability and compression
strength of AR Glass fiberreinforced concrete. In addition,
it inspects the influence of AR Glass fiber reinforcement on
concrete permeability. The AR Glass fibers decrease
permeability of specimens with increased volume of fibres.
Here an attempt is made to study the permeability of super
plasticised concrete with different types of fibres. The
fibres are added at the percentages varying from 0.2% to 1.0%
by weight of cement at intervals of 0.20%. To maintain a good
workability, superplasticiser is added at the dosages of 0.8%
by weight of cement. The dosage is arrived considering the
workability and strength on simultaneous reduction of cement
and water content ranging from 5% to 20% of the reference
concrete. The experiment was conducted in a six cell
permeability cell at the pressure of 10 kg/cm^{2} for
100 hours. Water permeability test is conducted as per IS:
30851987 and it is found that on addition of fibres, the
coefficient of permeability of concrete is reduced
considerably. 



Title: 
Selecting
proper connection points for ycapacitor to reduce EMI in SMPS 
Author (s): 
Milind M. Jha,
Kunj Behari Naik and Shyama P. Das 
Abstract: 
Ycapacitors are used to reduce
EMI in SMPS. This is a capacitor connected between primary and
secondary of the SMPS transformer to bypass EMI currents and
thus preventing them to reach mains port. Proper connections
points for this capacitor are discussed and experimental
results are analyzed to verify their effectiveness. 



Title: 
Emission and
performance characteristics of Karanja biodiesel and its blends
in a C.I. engine and its economics 
Author (s): 
Nagarhalli M. V., Nandedkar V. M. and Mohite K.
C. 
Abstract: 
In the present investigation
experimental work has been carried out to analyze the emission
and performance characteristics of a single cylinder 3.67 kW,
compression ignition engine fuelled with mineral diesel and
dieselbiodiesel blends at an injection pressure of 200 bar.
The performance parameters evaluated were break thermal
efficiency, break specific energy consumption (BSEC) and the
emissions measured were carbon monoxide (CO), carbon dioxide
(CO_{2}), hydrocarbon (HC), and oxides of nitrogen (NOx). The results of experimental investigation with biodiesel
blends were compared with that of baseline diesel. The results
indicate that the CO emissions were slightly higher, HC
emissions decreased from 12.8% for B20 and 2.85% for B40, NOx emissions decreased up to 39% for B20 and 28% for B40.
The efficiency decreased slightly for blends in comparison
with diesel. The BSEC was slightly more for B20 and B40. From
the investigation it can be concluded that biodiesel can be
used as an alternative to diesel in a compression ignition
engine without any engine modifications. 



Title: 
Effects on
major power quality issues due to incoming induction generators
in power system 
Author (s): 
K. S. Sandhu
and Sudhir Sharma 
Abstract: 
This paper presents a laboratory
study on the effects of integration of induction generators on
grid power quality parameters such as voltage, frequency power
factor, harmonics and reactive power. Study is carried out
with different switching sequence of grid connected induction
generators. The analysis is done with two squirrel cage
induction generators and one wound rotor induction generator
coupled to DC shunt motors. Experimental results as obtained
with different switching sequence are found to be very
interesting and useful for final recommendations. 



Title: 
Improving the
environmental cooling for aircoolers by using the indirect
cooling method 
Author (s): 
Farhan A.
Khmamas 
Abstract: 
Aircoolers are widely used as
a cheap and convenient method for cooling; however, noise,
humidity, smoking, and difficulty in controlling the interior
temperature are its major disadvantages. In this research, we
suggest using the indirect evaporative cooling method instead
of the direct method. In this method the aircooler is
modified to operate as a cooling tower to produce cooling
water by the evaporation process; this represents the outdoor unit. The cooled water is pumped to the indoor unit
which consists of a fan coil unit. Many experiments were
carried out to calculate the evaporation cooling effectiveness
(ECE) in case of the direct and indirect cooling (forced or
natural). The results for the two cases were compared. It is
concluded that the ECE reduces by 15% for forced evaporation
case, and by 22% for the natural case, as compared with the
direct case and (with in 30/5/2008 and 16/6/2008). 



Title: 
Quintic Bsplines
Galerkin method for fifth order boundary value problems 
Author (s): 
K. N. S. Kasi Wiswanadham and P. Murali Krishna 
Abstract: 
A finite element method
involving Galerkin method with quintic Bsplines as basis
functions has been developed to solve fifth order special case
boundary value problems. The basis functions are redefined
into a new set of basis functions which vanish on the boundary
where the Dirichlet types of boundary conditions are
prescribed. The method is tested for solving both linear and
nonlinear boundary value problems and is compared with the
methods available in literature. 



Title: 
Cuette flow
of two immiscible fluids between two permeable beds 
Author (s): 
T. V. A. P.
Sastry, M. Venkata Krishna, S. Sreenadh
and M. V. Ramanamurthy 
Abstract: 
Couette flow of two viscous,
incompressible, immiscible fluids in a channel bounded by
permeable beds is investigated. The lower bed is of finite
thickness with high permeability and the upper bed is of
infinite thickness with low permeability. The flow in the
lower permeable bed is described by Brinkman equation whereas
the flow in the upper permeable bed is described by Darcy’s
law. The flow between the two beds is governed by NavierStokes
equations. The velocity field and the mass flow rate are
obtained. It is observed that the velocity is in increasing
trend with the increment in the Reynolds number. 






 