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ARPN Journal of Engineering and
Applied Sciences
February 2021 | Vol. 16 No.
4 |
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Title: |
Numerical investigation of the air flow
inside a data center |
Author (s): |
Ahmed G. A. Allam, Mahmoud A. Fouad, Taher
M. A. Halawa and Ahmed A. Shawky |
Abstract: |
Data
centers nowadays consume vast amounts of energy due to high density
computational capabilities. Efficient energy consumption is a must to
face the increased thermal dissipation of such modern data centers.
Energy consumption can be addressed at multiple levels that include
cooling requirements. Data center cooling represents a large portion of
the energy consumed which can be minimized if best practices are applied
in relation to the design of the data center. CFD simulations are the
best tools to evaluate such practices in relation to the individual
design of each data center. A simple raised floor data center was
created using CFD software and two curtains were placed above the floor
diffuser opening. The inlet air velocity was changed multiple times as
well as the curtains heights. The results showed that: adding two
curtains improves the temperature profile of the higher racks at the
mid-plane, at low inlet velocities. |
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Title: |
Experimental design and analysis of lens
antenna for Massive MIMO communications |
Author (s): |
Haitham Al Fatli and Norshidah Katiran |
Abstract: |
Since
from last decade, the lens antenna technology gained significant
attention from researchers for various applications. Kinds of lenses
introduced to enhance efficiency and gain regardless of end-user
applications. The millimetre-wave beamspace communications are future
communication technology introduced for improving the data rate and user
capacity. However, the current solutions required the dedicated radio
frequency channel which leads to extra overhead of energy consumption
and cost efforts. Lens antenna technology has been proven an effective
technique for Massive MIMO communications to improve the data rate and
user capacity while achieving energy and spectral efficiency. In this
paper, we present the scheme and experimental examination of the lens
antenna based on Massive MIMO. The design of the lens antenna is
performed by using the magnifying glass. The transceiver model of
Massive MIMO consists of 60 lens antennas. This paper presents the
complete design methodology of lens antenna for wireless communications
and their experimental validations. |
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Title: |
Impact of climate change on the water
sector in the Singkoyo Watershed, central Sulawesi, Indonesia |
Author (s): |
I. Wayan Sutapa, Yassir Arafat, I. Gede
Tunas and Fitrianti |
Abstract: |
Climate change affects the water cycle on the face of the earth which
directly affects water availability. This study was conducted to
identify the hazards of climate change to the water sector that are
likely to occur in the Singkoyo Watershed. Some of the methods used
include: Penman-Monteith method, calibration solver, F. J. Mock model,
Mann Kendall and Sens (Makesens), relative distribution frequency (RDF)
and weighting. The data used are secondary data, namely rainfall and
climate of Singkoyo Station in the year 1986-2017. The results of the
analysis of rain and climate data indicate that climate change has
occurred in the Singkoyo Watershed. The hazard of decreasing water
availability occurs in all projection periods with the weight of the
hazards varying from the hazard of decreasing the availability of very
high, high, medium and low water. The hazard of flooding does not occur
this is seen from the decrease in the total runoff value (TRO) in the
projected condition. While drought hazards occur in all projection
periods with very high hazard weights due to a decrease in TRO = 120
mm/year, except for the period 2056 - 2065 there is a moderate drought
hazard with hazard weight 3, where TRO reduction is 86.94 mm/year. |
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Title: |
Classical and predictive control applied
to a DC/DC Buck-Boost converter |
Author (s): |
Diego F. Sendoya-Losada, Jesús D.
Quintero-Polanco and Johan J. Molina-Mosquera |
Abstract: |
In
this work, two controllers, a Proportional Integral (PI) and a
Model-based Predictive Controller (MPC), have been designed to regulate
a DC/DC Buck-Boost converter. First, the modeling and linearization of
the system was performed using a frequency response estimation method.
Then the PI controller was designed around a certain setpoint. Next, an
algorithm was designed according to the Extended Prediction
Self-Adaptive Control (EPSAC). Finally, the performance of the
controllers is evaluated for setpoint tracking and disturbance
rejection. |
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Title: |
Design and analysis of high-frequency
square Microstrip Patch antenna system |
Author (s): |
Aaron Don M. Africa, Phillip Christian C.
Cardino and John Rossi Rafael R. Llaga |
Abstract: |
Microstrip Patch antennas are one of the biggest electronics markets
being used in several industries and are responsible for many
communication networks and systems. This project proposed to create a
program using MATLAB to simulate a function that is similar to a
high-frequency Microstrip Patch. The produced program was made from
MATLAB with the aid of the antenna toolbox. Within this toolbox were
custom antennas which means it was possible to create unique antenna
geometry and meshes along with being able to determine the impedance
needed. Antenna Toolbox and PDE Modeler is a function MATLAB contains
commands for viewing the parameters when designing and analyzing MAPs. |
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Title: |
Identification of potential mineral in a
mining area plan using geoelectrical investigation |
Author (s): |
Muhammad Ichsan Ali, Gufran Darma Dirawan,
A. Muhammad Idkhan and Abdul Hafid Hasim |
Abstract: |
This
geological structure estimation is done by flowing an electric current
under the surface, then analyzing the different electrical resistance
depending on the rock's quality, the degree of density, and soil
moisture conditions. The research location is in East Kabaena, Bombana
Regency, Southeast Sulawesi Province. The type of tool used is the
G-Sound, a cheap and reliable resistivity (geoelectric) measurement
tool. The geoelectric method used in this exploration is the resistivity
method with the Schlumberger Method electrode configuration. Then the
interpretation of the geoelectric survey data using the IP2Win software
represents a sounding point. The results of field investigations found
that the limonite layer with groundwater content had a resistivity value
range of 0.28 -20.00 ohm-m. Then the limonite layer with a few chunks of
rock with a resistivity value of 50.00 - 150 ohm-meters. The saprolite
layer contains groundwater with a resistivity value of 100-200 ohm-m.
The bedrock layer with a resistivity value greater than 5.034.00 -
23.351.00 ohm-m is the lowest part of the laterite profile. The nickel
laterite is in the limonite and laterite layers with a resistivity value
of 50.00 - 150 ohm-m with an estimated layer depth between 3 - 50
meters. The thickness of the layer ranges from 8 - 15 meters. Boring
tests must accompany the use of geoelectric tools for the identification
of soil structures. Interpretation of geoelectric data on metallic
mineral resources includes the interpretation of geoelectric data into
geological conditions. |
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Title: |
Digital signal conditioning to read phase
difference for Surface Acoustic Wave (SAW) sensor |
Author (s): |
Leonardo Perez-Cortes, Diego Sendoya,
Carlos Vera, July Mora and Mario Arbulu |
Abstract: |
Surface Acoustic Wave (SAW) technology rapidly expands in modern sensing
applications. Temperature, pressure and gases can be measured by SAW
structure, configurable to be interrogated wirelessly. Presently, SAW
sensor signal conditioning is mainly oriented to read the
input-to-output phase difference by using analog circuits. Digital
solutions are few (or not) explored, and its feasibility to process SAW
signals in real conditions is unknown. This article studies two digital
methods based on cross-correlation function and Fourier transform. Here
is explained how good (or accurate) these methods read the phase
difference when one of its input signals has considerable noise and
attenuation, situation very common in SAW technology. This study has
never been performed up to now and particular attention is given here to
prove its feasibility. Our outcomes indicated that cross-correlation has
better results than Fourier transform. In attenuation, cross-correlation
reads the phase difference properly, but it is recommendable to apply
smooth filtering when noise is significant. This function was developed
by LabVIEW platform, whose noise and attenuation were included. |
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Title: |
Application of service-oriented computing
in computational science: Wave propagation and scattering in vegetation |
Author (s): |
Michael Yu-Chi Wu |
Abstract: |
In
the world where collaboration among multidisciplinary services is
necessary for continuous improvements, scientific computing,
unfortunately, lacks the infrastructure that allows for this type of
collaboration. As such, this paper recommends guidelines of
service-oriented, multi-layered designs through the exemplifications of
models, service-oriented architecture, architectural layers, service
compositions, and computational stages. The objective is to apply these
services-computing principles to the designs of scientific-computing
applications. To establish the validity of these suggestions, further
benchmarks that run on 32 computers have demonstrated consistent
speedups of at least 20 times with negligible latencies in service
orchestrations (under 1% of the total simulated time). This study
provides sciences with procedures that coalesce with technologies
through services computing platforms. |
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Title: |
Development of an interactive plant
monitoring device by using Arduino microcontroller |
Author (s): |
Zabidi M. I. Z. M., Idrus M. H., Abidin A.
F. Z., Hasim N. A. H., Harun M. H., Azahar A. H., Wook T. T. M. F. and
Said M. R. |
Abstract: |
Gardener conveys a wide range of plants which will have fluctuating
watering requirements for each plant must get the perfect measure of
water. An unreasonable measure of water may keep the plant's underlying
foundations from oxygen and thought to process them to decay; too less
water and the plant will now not get hold of the nutrients in wishes to
keep on existing. Besides, gardener mostly do not know how was the
character shown by plant instead of pets where they could show their
feeling when they are threatening. This experiment concentrated on the
best way to build up a framework utilising Arduino that controls all the
parameter required of plants life at the ideal time. Besides that, this
project proposed as no automation needed as we want it to be
interactively fun like playing a "Pou" game for real in terms of plants.
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Title: |
CFD analysis of Small Hydro Plant
Turbines: Case studies |
Author (s): |
Priyabrata Adhikary, Susmita Kundu and
Asis Mazumdar |
Abstract: |
Performance analysis of Small Hydro Turbine is an essential practice to
ensure that Small Hydro Plant performance is still at an acceptable
level. In addition, performance testing is required as a part of
programs to improve the efficiency, output, and economic performance of
small hydro plants along with Optimization which has been an important
focus in recent years. This study deals with three different Small Hydro
Turbines of various manufacturer or projects. Comparison between
simulation results and project/manufacturer data reveals a good
agreement. To the best of the author’s knowledge these novel approach
for CFD analysis of Small Hydro Turbines together using DSS Solidworks
Flow Simulation (FloEFD) is absent in renewable energy or fluid
mechanics literature due to its assessment complexity. |
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Title: |
Determination of the average reservoir
pressure for horizontal wells from buildup, drawdown and multi -rate
tests in homogeneous and naturally fractured formations by the TDS
technique |
Author (s): |
Freddy Humberto Escobar, Ángela María
Palomino and Daniel Suescún-Díaz |
Abstract: |
The
importance of the average reservoir pressure in all phases of the
hydrocarbon industry implies to conduct continues research for better
calculations of this property. In this paper the pseudo steady-state
pressure solution in hydraulically fractured wells combined with a
better determination of the effective wellbore radius is used to provide
accurate estimations of the average reservoir pressure. These solutions
initially presented for homogeneous formations are also extended to
naturally fractured reservoirs and expressions for reservoir shape
factors and average reservoir pressure are introduced for flow, pressure
buildup and multi-rate tests for either liquids or gas reservoirs. The
expressions are successfully tested with synthetic examples and compared
to calculations from material balance given absolute deviation errors
lower than 0.25 %. |
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Title: |
Determination of BESS impact in Local
Distribution System with Quasi-Dynamic Simulations study case: The IEEE
34 Nodes Test Feeder |
Author (s): |
Luis Felipe Gaitan, Juan David Gomez and
Edwin Rivas Trujillo |
Abstract: |
In
Colombia, Battery Energy Storage Systems (BESS) is expected to be
included in transmission and distribution power systems in the following
years. In this paper, Quasi-Dynamic Simulations are performed to
evaluate the BESS include impact in a Local Distribution System (LDS)
lightly loaded. Simulation is performed in the IEEE 34 Node Test Feeder
System modified with the Commercial and Industrial Colombian sectors
demand curves. BESS operates during two peaks of load profiles.
Voltages, Active and Reactive Power Levels are analyzed during a 24
hours period. Loading in transformers and distributions lines are
analyzed too, in order to verify the electrical behavior during the
operation of BESS. BESS do not increase considerably the voltage levels
in the nodes but modify the active power pro-file during the peaks of
the curves and change the reactive power levels in the LDS. The loading
in lines and transformers have important changes. The Quasi-Dynamic
simulation shows that is necessary include voltage regulators in a
distribution system to keep the levels in the adequate range. In a
distribution system lightly loaded the BESS cause small voltage changes
in the nodes. |
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Title: |
Classical and Predictive Control applied
to a DC/DC Boost converter |
Author (s): |
Santiago Cortés-Perdomo, Sergio A.
Rincón-Caupaz and Diego F. Sendoya-Losada |
Abstract: |
In
this work, two controllers, a Proportional Integral (PI) and a
Model-based Predictive Controller (MPC), have been designed to regulate
a DC/DC Boost converter. First, the modeling and linearization of the
system was performed using a frequency response estimation method. Then
the PI controller was designed around a certain setpoint. Next, an
algorithm was designed according to the Extended Prediction
Self-Adaptive Control (EPSAC). Finally, the performance of the
controllers is evaluated for setpoint tracking and disturbance
rejection. |
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Title: |
Design and implementation of a robotic
hand prosthesis under the tensegrity approach for transradial amputees |
Author (s): |
Miguel Ángel Tovar Cardozo, Ruthber
Rodriguez Serrezuela, Jorge Luis Aroca Trujillo, Roberto Sagaro Zamora
and Enrique Marañón Reyes |
Abstract: |
The
prosthesis of hands in some of the cases allow to reach the same
functionality that has a real hand. For this reason, in the development
of this document we present a functional hand and forearm prosthesis,
which allows providing a replacement option to those who, due to lack of
development of this part of the body or an amputation, do not have this
limb. To design this prototype, first some calculations of forces and
torques that the proposed system can support are made. Then, with the
support of a model designed in the software of Autodesk, simulations are
found in which the design is subjected to external forces, giving as
results the forces, deformations, tensions, among others, to which the
prototype can operate. |
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Title: |
An original passive integration of
sunspace towards energy efficiency in buildings |
Author (s): |
Hamid Eskandari, Pariz Amiri and Sajad
Rezaei |
Abstract: |
In
this study, a new passive solar system-a sunspace in combination with
solar chimney (SS)-is proposed to go well the challenges of energy
demand in buildings. Renewable strategies for heating demand to be
performed before regarding mechanical equipment. The SS system with an
area of 4 m2 on the southern facet of the building is supposed. The
simulation was conducted through the Energyplus software and validated
by experimental data. Based on the outcomes, utilizing the SS system in
buildings can increase the amount of heat gained. This is a practical
plan to support space heating in wintry months. Furthermore, natural
night ventilation over the SS can decrease the cooling load during warm
seasons. The results additionally show that the highest energy-saving
for heating and cooling observed in January and July respectively.
Finally, the annual economic benefit of the SS system regarding the
power saving will be 14.3% subsequently the extended charge for
installing the SS will be regained by 8 years ordinarily. |
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Title: |
Proposal for a Neuro-Fuzzy system for
Uveal Melanoma detection |
Author (s): |
Daniel F. Santos-Bustos and Helbert E.
Espitia-Cuchango |
Abstract: |
This
paper presents a proposal for a Neuro-Fuzzy system to detect cancer-type
Uveal Melanoma (UM). The proposed method integrates image processing
algorithms with neuro-fuzzy system to detect the Uveal Melanoma. The
results present the training process for two configurations of the neuro-fuzzy
system. Rules that are redundant in the system could be identified and
simplified. The model created using ANFIS provides a suitable system for
the detection of Uveal Melanoma obtaining results close to 90.2% of
accuracy. |
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