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ARPN Journal of Engineering and
Applied Sciences March 2022 | Vol. 17 No. 6 |
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Title: |
Comparative assessment of the effect of
Polyurethane-Aluminum roofing and Non-Polyurethane roofing for
sustainable thermal comfort |
Author (s): |
I. P. Okokpujie, J. E. Sinebe, V. Essien,
S. E. Kelechi, J. Azeta and K. O. Okokpujie |
Abstract: |
Due
to the ozone layer depletion, many houses suffer from high thermal solar
radiation effects during the dry season in Nigeria's southern and
northern parts. This issue makes the use of an insulated roofing system
more significant to have a comfortable environment. This research aims
to proffer a solution by evaluating the performance of Polyurethane's (P.U.)
foam as a thermal insulation material embedded in the aluminum roofing
system for adequate human comfort. The thermal analysis was carried out
using a data logger to obtain the temperature data with time variation
for the two house models' indoor and outdoor environments. The study was
carried out for two hours in the morning, afternoon, and evening for
both the Polyurethane Aluminum roofing and the Non-Polyurethane roofing.
The authors employed a contour plot for one-factor analysis to study the
time variation effects on the roofing house models. The results show
that the P.U. embedded aluminum roofing sheet reduces the temperature by
5% in the morning, 16% in the afternoon, and 10% in the evening compared
with the Non-Polyurethane roofing sheet. Furthermore, the P.U. foam
application on the aluminum roofing shows a uniform heat distribution
and provides a sustainable, eco-friendly environment. This study
recommends that the manufacturing industry producing roofing sheets
should be use PU-form as an insulation material for cleaner and
eco-friendly thermal comfort. |
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Title: |
A novel boost converter based fuzzy logic
method for fast and accurate Maximum Power Point Tracking to control a
Stand-alone photovoltaic system |
Author (s): |
Rida Abdelmoumene, Ahmed Amine Barakate,
Azeddine Wahbi, Mouhib Omar, Abdessamad Benlafkih and Abdelkader
Hadjoudja |
Abstract: |
The
growth of Stand-alone photovoltaic systems has increased the demand for
high quality of energy produced and sustainable satisfaction of the load
power demands. In this paper a new of DC-DC Boost converter used to
control a stand-alone photovoltaic system by a fast and accurate fuzzy
logic Maximum Point Power Tracking algorithm is presented. In this
context the MPPT algorithm was used to extract the maximum available
power from the Photovoltaic module under particular environmental
conditions by controlling the duty cycle of the DC-DC converter. This
design depends heavily on two main components of the converter circuit,
namely; inductor and capacitor. All tests on the he proposed systems are
achieved in a simulation environment using MATLAB/Simulink software.
Therefore, the analysis results show that the proposed DC-DC Boost
converter demonstrates its significant advantages over traditional
systems in terms of power variation and optimal settling time. |
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Title: |
Comparative analysis on the cost of
software development model based on Weibull family lifetime distribution |
Author (s): |
Hyo-Jeong Bae |
Abstract: |
In
this study, properties of software development cost were analyzed by
applying the Weibull family lifetime distributions (Lindley, Rayleigh,
Type-2 Gumbel) which are utilized in the reliability evaluation field to
the software development model. Also, the Weibull family distribution
models were compared with the Goel-Okumoto basic model to verify cost
property, and the optimal development cost model was presented. For this
study, a total solution was performed using software failure time data
generated during desktop application operation, parameter calculations
were solved using the maximum likelihood estimation (MLE) method, and
nonlinear equations were calculated using the binary method. As a
result, fist, when the testing cost per unit time and the cost of
eliminating a single fault detected during the development testing
process increase, the development cost increases, but the release time
does not change. However, if the fault correction cost detected by the
operator during normal system operation increases, the development cost
increased along with the delay of the release time. Second, it can be
confirmed that the Lindley distribution model is efficient among the
proposed models as it has the best performance in terms of development
cost and releasing time. Third, if software developers and operators can
use this analytical information efficiently, they can explore the cost
of economic development by predicting relevant attributes. |
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Title: |
Towards an IoT-Based acoustic monitoring
system in smart cities |
Author (s): |
Tuyen Phong Truong and Nghia Trung Nguyen |
Abstract: |
This
article presents the design and implementation of a noise level
monitoring system based on the Internet of Things (IoT) technology.
MSP32P401R, a high-performance and low-power consumption microcontroller
of Texas Instruments, is used to execute a dedicated C program that
controls the sampling process of the sound stream from a MEMS microphone
and then computation the corresponding sound pressure level in decibels.
The obtained data is encapsulated, uploaded, and stored into a Firebase
real-time database using a NodeMCU ESP8266 module for the Internet
connection. The noise level values and also the results of data analysis
and statistics are visualized as charts allowing people to rapidly
observe and evaluate the noise level in the surveyed area. The initial
results of this study can be extended to set up an automated system for
surveillance and alert of noise pollution in smart cities. |
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Title: |
The influence of Spectral Responses on the
Structures heights: Case of the RHiss river earthquake in Morocco
(6.3MW) - seismogenic source 4 (Rif Oriental - Al Hoceima - Alboran) |
Author (s): |
Yassine Razzouk, Khadija Baba and Mohamed
Ahatri |
Abstract: |
Morocco is located in a risky geographical area: The Ibero-Maghrebi
Mediterranean zone, which is situated on the “seismic belt”, known for
its seismic instability and comprising high risk areas. Each year,
hundreds of earthquakes of different magnitudes are recorded by seismic
surveillance stations belong to the National Institute of Geophysics.
The aim of this paper is to study the influence of Spectral Responses on
the Structures as well as to make a comparison with the requirements of
the Moroccan seismic construction regulations (RPS) 2000 revised in 2011
in the case of the Rhiss river earthquake saved in seismogenic source 4
(Rif Oriental - Al Hoceima - Alboran). |
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Title: |
Aircraft landing control system built in
the class of "fold" catastrophe |
Author (s): |
G. Uskenbayeva, M. Beisenbi, A. Shukirova,
Zh. Abdugulova and L. Rzayeva |
Abstract: |
The
article investigates the problem of ensuring the robust stability of the
control system for the landing of an aircraft. The control law,
presented in the form of one-parameter structurally stable mappings,
makes it possible to build a control system with an extremely increased
potential for robust stability, while the synthesized control system
remains stable in a wide range of changes in the uncertain parameters of
the object and the set parameters of the control device. In the study,
when designing a landing control system for an aircraft, the
restrictions imposed by the aircraft design are assumed to be
permissible and constant, and their disturbing effects are not
considered. |
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Title: |
Power Speed Reduction Units for general
aviation part 8: Casing design for Metal Direct Additive Manufacturing |
Author (s): |
Luca Piancastelli, Eugenio Pezzuti and
Stefano Cassani |
Abstract: |
This
paper introduces a practical design procedure for Direct Metal Addictive
Manufacturing (AM) by Hybrid Selective Laser Sintering or Melting (SLS/SLM).
Theoretically AM frees the designer from many design constraints,
practically it introduces new problems and it requires a brand new
design of the part. Hybrid manufacturing reduces the problems without
solving them totally. Supports can be introduced but represent a waste
of time during manufacturing and during the post-mill removal. Before a
3D-printed metal part becomes usable, it has already undergone
significant post-processing in the form of CNC milling, hot-hyping,
shot-peening or sand-blasting. Powder-bed fusion parts shows a quite
rough surface finish. Considering that post-milling will be necessary in
any case, surface finish is less important than other issues metal 3D
printing. For example, very small cavities form within the part as it is
being built. These defects lead to cracks during the part life cycle.
Too few power applied by the wiper, too low laser intensity, excessive
or inefficient cooling are the most common causes. Geometry of the part,
optimized printing pattern and machine parameters are used to address
these problems. AM machine operators have to tune their machines for a
given material and print job. In the SLS/SLM process, density is
achieved with quality powders, optimized build parameters and controlled
machine environment. Hot isostatic pressing treatment as a post-process
removes the porosity and reveals excessive defect by deforming the part.
Residual stress is a result of the printing process. As the powder is
melted and cooled, expansion and contraction occur. The residual stress
is compressive at the center of the part and tensile at the boundary
surfaces. Therefore, thin walled continuous parts are to be preferred.
In fact the classical ribbed structure has several thickness
discontinuity requiring continuous adjustment in the build pattern and
in laser modulation. To ensure the quality of the part material, the
initial layers of the print are removed via CNC milling after the build
is complete. Unfortunately, the thermal stress of the substrate will
cause the part itself to warp modifying its geometry. Support structures
are positioned in the right locations to prevent distortion or warpage.
In addition, overhanging surfaces or down-skins faces have poorer
surface finish ad are subjected to warping. For this reason they also
need additional supports. For these reasons, the Direct Metal AM part
may have a completely different geometry than a cast component. An
example of redesigning of a PSRU (Power Speed Reduction Unit) is
provided in this paper. |
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Title: |
A framework for air pollution monitoring
in smart cities by using IoT and smart sensors |
Author (s): |
Arshad Ali |
Abstract: |
In
the last half century, the world population migrated from villages to
cities due to lack of facilities, education institutes, medical services
and job opportunities in the remote areas. Due to this migration the big
cities are under pressure to remain live-able and healthier because
population increasing quickly as compare to the services infrastructure.
As the city’s population increasing very rapidly and demand for the
civic facilities remains very high. One of the major addition is the
road traffic which become the big contributor in air pollution and make
the environment very unhealthy. In modern era, it is important to
persistently monitor the environmental pollution of city to make it
healthier and live-able. Internet of Things (IoT) with smart sensor
system is the solution which can be used to monitor the city for various
purposes and one of them is the pollution monitoring in big cities.
Sensor system can be installed and managed by integrating with IoT and
be monitored by sitting in city central office. In this research work, a
framework for air quality monitoring is proposed to monitor
environmental pollution for the smart cities by using IoT and smart
sensors. The proposed system is capable to measure the humidity, carbon
emission, temperature, smoke, sound and other hazardous particulate in
the atmosphere and send the measurements to city central office where it
is analyzed for further actions for the betterment of city environment.
Collected data is banked in a data bank for future use and also can be
shared with other research institute and environmental agencies. |
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Title: |
Manufacturing and development of MgB2
super conducting wire through hot rolling process |
Author (s): |
Satrio Herbirowo, Alex S. Purba, Vinda
Puspasari, Perdinan Sinuhaji, Nofrijon Sofyan, Akhmad Herman Yuwono and
Agung Imaduddin |
Abstract: |
In
this study, the synthesis and manufacture of MgB2/SS 316L
Superconducting Wire by In-Situ method through hot rolling with a
variety of sintering temperature and holding time with the novelty of
the SS316 sheath and hot rolling method were carried out to maintain the
size reduction results without stress concentration and minimal defects.
MgB2 is a superconducting material with a critical temperature of ~39 K.
Hot rolling process with a variety of sintering temperature and holding
time was carried out to observe its effect on the superconductivity
characteristics of MgB2. The process of synthesis and sample preparation
begins by measuring and cutting the SS3I6L tube and weighing the raw
materials, which were Mg and B powders with a ratio of 1:2 according to
stoichiometric calculations. The material was then grounded for 2 hours
using an agate mortar and then put into an SS 316L stainless steel tube
where it was completely compacted. Then, the sintering process was
carried out using a muffle furnace with variations in sintering
temperature of 780°C, 800°C, 820°C and holding time for 1 hour and 3
hours. After that, hot rolling process was carried out on each sample
with a temperature of 300°C. The samples were characterized by XRD,
Cryogenic Magnet and SEM-EDS. The identification through XRD showed that
the phases formed were MgB2, MgO, Fe. The Cryogenic Magnet test showed
superconductivity at a sintered temperature of 800°C and 820°C with a
holding time of 1 hour, where for a sintered temperature of 800°C, it
has a Tconset of 39.55 K and a Tczero of 34.69 K while at sintered
temperature of 820°C the TcOnset is 38, 44 K TcZero is 31.30 K. However,
in the MgB2 sample, the sintered temperature of 780°C with a holding
time of 1 hour did not show superconductivity properties. Meanwhile,
sintering temperature variation of 780°C, 800°C, 820°C with a holding
time of 3 hours showed superconductivity properties, namely the
appearance of TConset and TCzero in each sample. The morphological
structure and elemental composition were seen through SEM-EDS, where the
surface morphology had a hexagonal grain shape. As the sintering
temperature and holding time increase, the surface morphology of the
grains becomes denser and more regular so that the porosity is smaller. |
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Title: |
Optimization of fish - based sausage main
contents using response surface methodology-rheological studies |
Author (s): |
M. Abd Elgadir |
Abstract: |
The
objective of this study was to optimize the contents of fish-based
sausage as a rheological function of main contents using response
surface methodology. Response surface methodology (RSM) was applied to
evaluate the effects of the multiple ratios of added minced fish
(20-50), sago starch (10-40) and ice water (10-35) on rheological
properties of the product. Twenty different formulations of the sausage
were prepared using red tilapia fish (Oreochromis niloticus), sago
starch (Metroxylon sagu), and ice water. The samples were investigated
by dynamic rheological measurement in the temperature range from 30 -
90°C, for 5 min. in order to obtain find a suitable formulation which
has minimum onset temperature of gelatinization (To), minimum peak
temperature of gelatinization (Tp), minimum storage modulus (G’) and
maximum loss modulus (G”). The optimum ratios of the contents were found
at 20:10.2: 10, minced fish, starch, and ice water, respectively.
Therefore, when a better gelatinization properties fish sausage is
formulated, the optimum ratios of added contents (minced fish: starch:
ice water) should be 2: 1.2: 1, respectively. |
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Title: |
Empirical model for biodiesel-diesel
blending using different processing technologies and feedstock |
Author (s): |
M. S. Gad, Ashraf Amin and Ibrahim Mustafa |
Abstract: |
An
empirical model for predicting the relationship between the properties
of the biodiesel–diesel fuel blends (the density, flash point, cetane
number, kinematic viscosity, and calorific value of the biodiesel–diesel
fuel blend) and biodiesel fractions is developed. The developed model
represents a universal model for predicting the properties of the
biodiesel-diesel blend. The results of the experimental correlations
data were near the predicted mathematical equation with a confidence
level of 95%.The results indicated R2 = 0.95-0.99 in calculating the
biodiesel/diesel blends densities as a function of the biodiesel volume
proportion. Similarly, the results showed that R2 ranges from 0.97 to
0.99 in predicting flashpoint and kinematic viscosity. To achieve an
optimum blend of biodiesel with diesel, several feed stocks/preparation
methods can be conducted to achieve the superior blend. |
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Title: |
Digital road construction enterprise
solutions |
Author (s): |
Nadezhda Filippova, Michael Shilimov,
Irina Odinokova, Vitaliy Gaevskiy and Andrey Ostroukh |
Abstract: |
Paper
proposes the concept of digital road construction enterprise, that
integrates the processes of interaction control systems road
construction machinery. On the system tasked motion control construction
machinery and spatial position and its working bodies, dispatching
transport operations in real time. Search technologies appropriate to
the level of economic justification of the main criterion of promotion
of automation in the roads construction. Pairing interactive modeling
with intelligent data frees engineers and architects to quickly analyze
changes and design options in the physical environment. The potential
impact is huge for saving time on rework, accelerating the building
phase, and producing higher-quality projects. |
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Title: |
Impact of hall on peristaltic flow of a
newtonian fluid in a vertical channel through a porous medium |
Author (s): |
G. Ravindranath Reddy and K. Ramakrishna
Reddy |
Abstract: |
A study
is carried out to examine the influence of Hall effects on the
peristaltic flow of Newtonian fluid through porous medium under the
assumption of long wave length in a two- dimensional vertical channel.
The non-dimensional flow governing equations with boundary conditions
are solved for axil velocity and axial pressure gradient. The influence
of various emerging parameters on the pumping characteristics are
studied and explained with the aid of graphs. |
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Title: |
Comparative analysis of IGP protocols of
an Enterprise Network |
Author (s): |
Gowtham Sri Vishwesh, Rithvik S., Likhitha
Reddy K. and Ravikumar C. V. |
Abstract: |
This
paper shows an usage of IPV4 & IPV6 logical addressing for an Enterprise
Network Various configuration's done in this network are Access Control
Lists (ACL’s) on Edge Router of an Organization Network connected to ISP
router to block some services from our Network to outside internet. NAT
is done in edge router of an organization to secure organizations
private IP addresses. Virtual LAN’s (VLAN’s) is done in each switch of
an organization which provides layer2 security. The best interior
gateway protocol can be found in an Enterprise network by comparative
analysis. |
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Title: |
A functional model with double control
loop for safe autonomous robot navigation |
Author (s): |
Fredy H. Martínez S., Faiber Robayo
Betancourt and Fernando Martínez S. |
Abstract: |
The
design of robotic platforms for service robotics applications requires a
good solution to the problem of autonomous mobility. One of the basic
tasks of these robots is to navigate through structured environments
with large displacements while traveling a predefined path. A good
solution to this problem is the visual identification of the path and
characteristics of the environment (free space and obstacles) using
digital cameras and processing of its information to infer the possible
movements of the robot. In this paper, we propose a navigation scheme
based on visual feedback formed by two control loops. The first control
loop corresponds to a visual memory strategy based on a convolutional
neural network. The training of the control system is performed using
images with characteristic elements of the navigation environment
(different obstacles and different cases of free paths, with and without
a navigation path). The system is propagated over the robot using the
current images of two cameras in stereoscopic configuration. The second
control loop defines specific distances to the obstacles using
stereoscopic vision. This second control loop aims to quickly identify
points of the obstacles in front of the robot from the images using a
bacterial interaction model. These points are mapped in the planes of
projection of the environment to establish the distance to the obstacle.
Here, we introduce a complete framework that efficiently performs
stereoscopic vision-based analysis in real-time, by significantly
reducing the computational cost. Our strategy does not require
modifications to the environment, nor special camera schemes in the
robot, so it can be used in many robot topologies and many different
environments without major adjustments. Simulations and real-world
experiments show the validity and performance of the proposal. |
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