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ARPN Journal of Engineering and
Applied Sciences January 2020 | Vol. 15 No.
2 |
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Title: |
Effect of a suspension system on the
design parameters of flexible pavements using finite-layer modeling |
Author (s): |
Julián Andrés Pulecio Díaz, Myriam Rocío
Pallares M. and Wilson Rodríguez Calderón |
Abstract: |
The
effect of a suspension system on the design parameters of asphalt layer
in a flexible pavement using finite layers freeware "3D-Move Analysis
V2.1" is evaluated. This is done trying to reproduce more closely the
contact and stress of the design axle (80kN) having as new input
variables the damping and dynamic movement which are not currently
applied in Colombian practice. To validate, the elastic multilayer
EverStress©5.0 software was used. The results of the strain can conclude
that the asphalt pavement designs developed with analytical methods may
be slightly oversized and consequently, the cost of construction of
pavements increases. This study allows to analyze the sensitivity of
various factors that may affect the design of asphalt pavements. |
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Title: |
Analysis of dynamic wheel loads of a
semi-trailer truck with air-spring and leaf- spring suspension systems |
Author (s): |
Le Van Quynh, Bui Van Cuong, Nguyen Van
Liem, Le Xuan Long and Vu The Truyen |
Abstract: |
In
order to analyze the vertical dynamic tire loads of a semi-trailer truck
acting on road surface equipped with air- and leaf- spring suspension
systems, a half- vehicle dynamic model with 12 degrees of freedom is
developed under random road excitation. A dynamic load coefficient (DLC)
is chosen as objective function and Matlab/Simulink software is used to
simulate and analyze the vehicle dynamic model. The performance dynamic
wheel load of both air- and leaf- spring suspension systems are analyzed
under different operating conditions such as different vehicle speeds,
road surface roughness and vehicle loads. The obtained results indicate
that the air-spring suspension systems reduced the dynamic tire loads
acting on road surface better than the leaf-spring suspension systems
under all operating conditions. Especially, the DLC values at all axles
with air-spring suspension systems are significantly reduced by 3.72%,
55.91%, 50.53%, 31.47% and 25.45% in comparison with the leaf-spring
suspension systems, respectively when vehicle moves on the ISO class B
road surface roughness at v=20 m/s and full load. |
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Title: |
Non-linear behavior of reinforced concrete
semi-rigid joints under lateral loads |
Author (s): |
Khair Al-Deen Bsisu and Ibrahim
Altarabsheh |
Abstract: |
The
main goal of this study is to investigate the nonlinear performance of
concrete connections considering their actual flexural stiffness under
lateral excitation. First, the joints were applied to cyclic lateral
loading. From the developed experimental models, the actual relation
between connections’ rotation and its corresponding moment were
obtained. Second, an ANSYS model was developed to determine the
connections’ rotation and its corresponding moment for the RC
connections based on their size, concrete strength and rebar details.
The connection rotation is equal that from the experimental models. The
study concluded that modeling connections as rigid connections will
significantly overestimate the stiffness of RC buildings and give
erroneous structural responses. |
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Title: |
Conversion of agricultural biomass corn
residues: impact on power generation and sustainable emissions reduction
in Nigeria |
Author (s): |
Yekini Suberu Mohammed, Aminu Asumo Maruf,
Abdulkadir Saidu Shettima, Yusuf Yunusa Sanni and Audu Nasiru |
Abstract: |
Nigeria is presently drifting towards making an ambitious commitment to
renewable energy development. Small scale solar energy is currently
being harnessed for rural electrification in Nigeria but the use of
biomass especially agricultural residues for power generation is largely
neglected. Therefore, in this paper, the assessment of the potential of
three corn (maize) residues for power generation is conducted for the
geo-political zones in the country. Different corn residues (stalk, cob,
and straw) were processed into dried samples with particles diameter of
0.35-0.42 mm and used experimentally in IKA C2000 bomb calorimeter for
the determination of lower heating values. Crop-to-residue ratios of the
selected residues were also determined using standard laboratory
analysis while a mathematical computational method was used for the
estimation of the potential bioenergy of the residues. A total of 145.2
PJ (40.3 TWh) of the potential bioenergy estimated from the residues is
equal to approximately one-half of the total electricity consumption of
26.26 TWh in the country in 2016. The energy potential also represents
4,604 MW of electricity and the current national electric power
generating capacity fluctuates between 4000-5000 MW. A total of 9416991
Gg of emissions that could be saved using the residues for power
generation was also calculated for all the geopolitical zones. Findings
revealed that the bioenergy potential of 4,604 MW estimated from the
selected corn residues can produce a substantial amount of the national
electricity demand. The estimated emissions potential is mainly from
carbon dioxide (CO2), carbon monoxide (CO) and methane (CH4) known for
their high level of anthropogenic environmental pollution. |
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Title: |
Machine learning based automatic defect
detection in non stationary thermal wave imaging |
Author (s): |
A. Vijayalakshmi, V. S. Ghali, G. V. P.
Chandrasekhar Yadav, V. Gopitilak and Muzammil Parvez M. |
Abstract: |
Detection of subsurface non uniformity is crucial in deciding the
strength of objects for various industrial applications. Non stationary
thermal wave imaging is emerging as a reliable qualitative assessment
procedure to detect anomalies in a wide range of materials. This paper
proposes a supervised machine learning based classification modality to
detect the subsurface defects using quadratic frequency modulated
thermal wave imaging and experimentation has been carried over glass
fibre reinforced polymer material (GFRP) with 10 Teflon patches having
different depths and sizes and Carbon fibre reinforced polymer (CFRP)
with 25 bottom holes having different sizes and depths. In this paper
three well known supervised machine learning techniques Decision tree
(DT), Support vector machine (SVM) and k-nearest neighbour (KNN)
classifiers are used for defect detection. Detection capability and
reliability of defect detection have been assessed using signal to noise
ratio and probability of detection respectively. |
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Title: |
Design of an ASK modulation digital signal
conversion system |
Author (s): |
Aaron Don M. Africa, John Joseph M.
Castillo, Luis Anton D. Nieto and Shawn Reece T. Wu |
Abstract: |
Digital modulation is a special kind of modulation where the message
signal is digital in nature and has three types that consist of the ASK
(Amplitude Shift Keying), FSK (Frequency Shift Keying), and PSK (Phase
Shift Keying). The ASK (Amplitude Shift Keying) is a modulation method
to compress bits into each pulse of a signal transmission where the
amplitude of the carrier wave is changed according to the digital input
signal, therefore, making it analogous to AM (Analog Modulation). If the
digital signal value is 1 then the carrier wave amplitude remains the
same. When the digital signal value is 0 the amplitude of the carrier
wave is much weaker. At present, the ASK is utilized at nearly every
digital communication devices, cellular phones and televisions included.
Certain devices like satellites and smart televisions manipulate two
parallel ASK links which are 16 in level and has a 90-degree phase
rotation. The 16 by 16 integration is further acknowledged as a 256 QAM.
This research will design an ASK modulation digital signal conversion
system. |
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Title: |
Horizontal layout bend of bridges
structure effects on the static design internal forces: Evaluation and
optimization study |
Author (s): |
Ali Fadhil Naser and Hussam Ali Mohammed |
Abstract: |
Horizontal layout bend was an important factor in the design of bridges
structure depending on nature of bridge location within construction
area. The aim of this study was to evaluate and optimize the different
designs of bridge horizontal layout bends and compare the results with
horizontal layout straight of bridge by depending on the application of
static analysis according to finite element analysis method. Static
analysis results showed that the straight model had the minimum values
of static internal forces. Therefore, this model gave higher resistance
to effects of applied loads and the horizontal layout straight of this
type of bridges was suitable for design. |
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Title: |
Object sorting in an extended work area
using collaborative robotics and DAG-CNN |
Author (s): |
Javier O. Pinzón-Arenas and Robinson
Jiménez-Moreno |
Abstract: |
The
following paper presents the development of an algorithm for grouping
and ordering of up to 10 different objects, where segmentation
techniques are used for background elimination for the detection
process, and a CNN (convolutional neuronal network) type DAG (Directed
Acyclic Graph) for the classification of the elements. The algorithm
detects and classifies the objects found on a table and controls an
anthropomorphic manipulative robot to take each one and deliver it to a
second robot, which takes the object and moves it to the grouping zone,
where it orders each received element, one next to another, at a
constant distance between them. A CNG type DAG with an accuracy of 100%
was used, whose input is a rectangular image of 70x35 pixels that
contains the object to be classified, and outputs the classification of
each element, its location on the table, its dimensions (width and
height), and its orientation in degrees, managing to interact and order
up to 10 elements, both in simulation and in a physical environment. |
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Title: |
A review of solid waste management in
Nigeria |
Author (s): |
Oyije A. O., Ndububa O. I. and Ndububa E.
E. |
Abstract: |
Inappropriate disposal of these untreated trashes can be injurious to
humans and the environment. Air pollution, underground water
contamination, land degradation, soil contamination and habitat
deterioration can be caused by inappropriate waste disposal. The poor
state of the management of solid wastes is accompanied by poor
implementation of policies and lack of proper sensitization of the
public which worsens the situation, resulting in pollution of urban
surface and ground water resources. The review shows that municipal
solid waste is made up of residential or household waste; commercial
wastes/ institutional trash and municipal services
wastes. Values for solid waste generation in two States are found to
vary from 0.13 kg/capita/day in Ogbomosho, Oyo State to
0.71 kg/capita/day in Ado-Ekiti, Ekiti State. Typical composition
of municipal solid waste in Nigeria is found to consist of paper, metal,
glass, textile, plastic, ash dust, organic content and other
micro-elements. Waste reduction is presented to be the most efficient
way to reduce the negative health impacts and environmental influence of
a waste. It is imperative that inappropriate method of solid waste
management should be addressed through effective implementation of
policies and proper sensitization of the public. |
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Title: |
Grid number and expansion factor for the
solution of scalar convection-dominated equation: Comparison between the
method of ‘shooting’ and that of finite-difference |
Author (s): |
Aslam Abdullah |
Abstract: |
There
have been many researches which focus on the grid quality in
computational fluid dynamics. Despite it is known that, for instance,
the higher the grid number, the more accurate the results, systematic
framework for the selection of grid numbers based on some flow
parameters remains as an open-ended issue. This paper highlights some
findings on the idea of such framework, and considers grid number and
grid expansion factor as two of many factors which contribute to result
accurateness. In particular, it takes scalar convection-dominated
equation solution into account, in order to show that the grid number
and expansion factor are predictable for a range of Peclet number of
interests. Two methods are used to solve the equation. They are shooting
method as well as that of finite-difference. Relationship between grid
expansion factor and Peclet number, and that between grid number and
Peclet number for both methods are then discussed. The results prove the
predictability of the grid parameters of interest, and shed light on
more general framework for the selection of grid parameters based on
flow parameters. |
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Title: |
Statistical analysis of concrete
reinforcement strength for analysis of reinforced concrete construction |
Author (s): |
Zuzana Marcalikova and Radim Cajka |
Abstract: |
The
article deals with the determination of static characteristics of
concrete reinforcement for selected cross-sections. The aim of the paper
is to provide a comprehensive processing of a set of laboratory data
that can be used in probabilistic calculation or stochastic modeling.
Specifically, three test series are processed that differ in diameter.
At the same time, the selected diameters also have different
manufacturing methods for B500A and B500B. Part of the contribution is
regression analysis and determination of the confidence band. The test
results are compared with the declared values of the manufacturer and
the design standard. |
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Title: |
A comparison of L25 GRA and L25 Taguchi
Statistical Method for optimizing 16 nm DG-FinFET on output variation |
Author (s): |
Ameer F. Roslan, F. Salehuddin, A. S. M.
Zain, K. E. Kaharudin and I. Ahmad |
Abstract: |
The
repercussions of a 16 nm double-gate FinFET (DG-FinFET) design against
two different optimization methods are investigated and examined. The
drive current (ION) and leakage current (IOFF) ramifications towards the
adjustment of six process parameter that incorporates polysilicon doping
dose, polysilicon doping tilt, Source/Drain doping dose, Source/Drain
doping tilt, VTH doping dose and VTH doping tilt for both L25 Orthogonal
Array (OA) Grey Relational Analysis (GRA) as well as an L25 OA of
Taguchi Statistical Method (TSM). However, with TSM, a consideration of
noise factor in gate oxidation temperature and polysilicon oxidation
temperature is included. The utilization of ATLAS and ATHENA modules
enables respective design simulation as well as characterizations of
device’s electrical attributes to be performed. Subsequent to the
initial responses from the design simulation, implementation of both TSM
and GRA have been implemented separately to assist in process parameter
optimization in view to optimize the output responses. The factor
percentage of Signal-to-noise ratio determined the process parameter’s
effectivity. The most prominent factor is similar for both TSM and TSM-based
GRA for which is the polysilicon doping tilt, whereby for L25 OA TSM, the ION and IOFF obtained after the optimization
are 1559.97 µA/µm and 33.03 pA/µm that brings the ION/IOFF ratio to
47.23 ? 106 as opposed to more insignificant 32.49 ? 106 on
pre-optimized simulation. Meanwhile small increment of ratio at 48.01 x
106 from respective values of 1656.27 µA/µm and 34.49 pA/µm for the TSM-based
GRA proves that both optimization techniques have met the predictions of
International Technology Roadmap for Semiconductors (ITRS) 2013. |
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Title: |
Creation of reinforced concrete structures
of a complex geometric shape |
Author (s): |
S. Bugaevsky, N. Smirnova, A. Filatova, E.
Sinkovskaya and A. Ignatenko |
Abstract: |
The
analysis of modern technologies for the creation of buildings as a whole
or of individual structural elements of a complex geometric shape is
carried out. The aim of the study is to develop a new architectural and
construction system “Monofant” using a self-supporting skeleton for the
construction of monolithic reinforced concrete buildings and structures
of a complex geometric shape. The subject of the research is the
formation of a self-supporting skeleton consisting of a reinforcement
cage and non-removable liners-void formers. On the basis of the shape of
the main carrier element in the form of a Mobius loop, the layout of
liners-void formers is made. The form of liners is adopted in the form
of three-sided prisms of two sizes, based on the condition of minimizing
the number of elements of the internal fixed formwork, as well as
ensuring the rigidity of the structure. A comparison of three variants
of the assembly technology of a self-supporting skeleton for the
erection of a structure in the form of a Mobius loop is made. The task
of creating a technology of manufacturing foam polystyrene liners for
the construction of lightweight reinforced concrete structures of a
complex geometric shape is solved. A “virtual”catalogue of fixed
polystyrene liners for various curvilinear surfaces is obtained. |
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Title: |
Investigation on behaviour of FRP Tube
Encased Concrete columns with and without reinforcement |
Author (s): |
N. Lokeshwaran, Elikinty Raviteja and
Pavithra C. |
Abstract: |
This
paper presents analytical study of the Fiber Reinforced Polymer (FRP)
Tubes Encased Concrete columns with and without reinforcement and
comparing the results with conventional concrete. FRP encased concrete
system was developed as a new structural component for a masonry
building and heritage structures. FRP encased concrete columns are light
in weight and good in compression, flexibility and an anti-corrosion
material. An analytical model has been created to forecast the axial
compressive behaviour of Glass Fiber Reinforced Polymer (GFRP) columns
using Finite Element software (FEM). The energy absorption capacity and
stiffness characteristics are determined in this investigation. This
study involves 12 specimens of height 500 mm and diameter 200 mm with
different thickness. The significance of different thickness on the
axial compressive behaviour of GFRP Tube columns has been studied. The
static and non-linear loading analysis is done the specimen. The results
proved that the mechanical strength of GFRP tube columns are 30% higher
than conventional concrete columns. |
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Title: |
Experimental studies of metamaterials
application in transmission lines based on coaxial waveguide |
Author (s): |
D. S. Ryzhenko, M. O. Makeev and G. N.
Kuvyrkin |
Abstract: |
The
paper focuses on the use of metamaterials for the improvement of
existing microwave devices of the waveguide type. In particular, it
describes theoretical and experimental studies of the transmission line
based on coaxial waveguide containing metamaterial. Also, the
possibility of using metamaterials for the creating a rejection filter
based on such transmission line is shown. |
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Title: |
Debris-flows in Peninsular Malaysia:
Topography, geology, mechanism and sediment discharge |
Author (s): |
Jimjali Ahmed, Mohd. Raihan Taha, Mohd.
Anuri Ghazali, Che Hassandi Abdullah and Senro Kuraoka |
Abstract: |
Debris-flows caused the highest number of deaths amongst the many types
of landslides in Malaysia due to its high velocity, and the travel
distance that it covers. As such, 8 events which occurred from 2001 till
2007 were chosen to ascertain the preparatory and triggering factors for
debris-flows in Peninsular Malaysia. Site investigations and laboratory
tests were conducted and documented in 2010 with detailed description of
the debris-flow channels which are useful for deduction of the
debris-flow mechanism and sediment discharge estimation. The influences
of slope gradient, catchment area and geology on the initiation and
deposition of debris-flows are examined and sediment discharge volumes
are estimated based on field investigation and calculated based on
Japanese guidelines. It is concluded that for the study sites, the bed
gradient of initiation zones are more than 20o while the catchment area
ranges from 0.2km2 to 3.5km2. The gradient of the banks along the flow
path are typically close to 50o forming a V-Shape channel. All
initiation locations occurred in weathered granitic rock and are also
near to metamorphic formation. The particle size comprises of 75%
cobbles and boulders and 25% sandy silt which is typical of weathered
granite. The most prevalent mechanism of debris-flow in Peninsular
Malaysia is gully bed erosion. Landslide induced debris-flows and
collapse of natural dam are also possible. The potential sediment
discharge volumes estimated based on the field studies show similar
trend with the data in Japan with a sediment yield of about 14,200m3 per
event per km2 of catchment area. |
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Title: |
NetFPGA: Status, uses, developments,
challenges, and evaluation |
Author (s): |
Dixon Salcedo Morillo, César Guerrero
Santander and Albeiro Cortés Cabezas |
Abstract: |
The
constant growth of the Internet, driven by the demand for timely access
to data center networks; has meant that the technological platforms
necessary to achieve this purpose are outside the current budgets. In
this order to make and validate relevant, timely and relevant
contributions; it is necessary that a wider community, access to
evaluation, experimentation and demonstration environments with
specifications that can be compared with existing networking solutions.
This article introduces the NetFPGA, which is a platform to develop
network hardware for reconfigurable and rapid prototyping. It’s
introduces the application areas in high-performance networks,
advantages for traffic analysis, packet flow, hardware acceleration,
power consumption and parallel processing in real time. Likewise, it
presents the advantages of the platform for research, education,
innovation, and future trends of this platform. Finally, we present a
performance evaluation of the tool called OSNT (Open-Source Network
Tester) and shows that OSNT has 95% accuracy of timestamp with
resolution of 10ns for the generation of TCP traffic, and 90% efficiency
capturing packets at 10Gbps of full line-rate. |
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