Title: |
Simulation of
indoor air flow for a room with windows at their adjacent walls
under various wind flow direction using CFD |
Author (s): |
D. Prakash
and P. Ravikumar |
Abstract: |
The present paper is about to study the effect
of wind direction on thermal comfort in a office room with
windows at their adjacent walls. As a preliminary work, a
suitable turbulence model was selected by analyzing the
various turbulence models like Standard K-e,
Renormalization-group (RNG) K-e and Realizable K-e model and
their closeness to the experimental results are predicted.
From the preliminary study, Standard K-e model is selected as
a suitable turbulence model for this thermal comfort study.
The CFD simulation is also checked for grid independence test.
Secondly, the effect of wind direction on thermal comfort was
analyzed by including the fluctuation of wind direction. The
CFD simulated mass flow rate for all wind directions are
compared with the network work model and the maximum
discrepancy obtained is 9.97% which is within the accepted
level. The indoor air flow pattern, temperature distributions,
are predicted and these results are very much useful to
identify the most comfort and un comfort zones prevailed
inside the room for various wind directions. |
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Title: |
Stability
analysis of paralleled single ended primary inductance
converters |
Author (s): |
A. Ezhilarasi
and M. Ramaswamy |
Abstract: |
The small signal model offers an encouraging
scope to examine the steady state stability and there from
establish a viable operating range for power converters. The
theory of Eigen value analysis facilitates to predict the
stable operation and introduce appropriate measures to regain
its equilibrium in the event of an exigency. The paper
attempts to develop a methodology through the use of
compensators to ensure that the Eigen values of the
characteristic equation of the converter lie in the left half
of the S plane. It includes the philosophy of a master slave
current sharing mechanism in the scheme to arrive at
satisfactory servo and regulatory results. The performance of
the parallel connected SEPIC (Single Ended primary Inductance
Converters) system is evaluated using time and frequency
domain plots on a MATLAB platform to project the suitability
of the proposed approach in practical applications.
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Title: |
Interaction
effect of space frame-strap footing-soil system on forces in
superstructure |
Author (s): |
Vivek Garg
and M.S. Hora |
Abstract: |
The conventional method of
building frame analysis assumes that columns are resting on
unyielding supports. In reality, the supporting soil strata
deforms unevenly under the action of loads, which causes
redistribution of forces in the frame members and stresses in
the supporting soil media. In the past, many researchers
investigated and emphasized the need of soil-structure
interaction analysis. There may exist a situation where
column(s) of a building are located near adjoining property
line. In this situation, an eccentric footing is generally
provided. This causes angular rotation in such individual
footings due to moment developed by eccentric loading. The
strap beams may be provided under such circumstances in order
to control the rotation within permissible values. However, in
India the normal practice is to provide individual column
footings without strap beams. In the present work, the
interaction analysis of a three-bay three-storey RCC space
frame- footing-strap beam-soil system is carried out to
investigate the interaction behavior using the finite element
method. The frame, foundation and supporting soil mass are
considered to be linear elastic and to act as a single
compatible structural unit for more realistic analysis. The
analyses have been carried out to evaluate the axial force and
moment in columns, bending moments and shear force in floor,
plinth and strap beams. The comparison is made between the
non-interaction and interaction analyses. The emphasis is made
on the necessity of interaction analysis using strap beams.
The inclusion of strap beams in the foundation will prevent
failure/distress of the structure likely to be caused by heavy
moments induced when only eccentric isolated footings are
used. |
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Title: |
UML based web
service regression testing using test cases: a case study |
Author (s): |
Rajani Kanta
Mohanty, Binod Kumar Pattanayak and Durga Prasad Mohapatra |
Abstract: |
Web services represent the class
of Service Oriented Architecture (SOA) based applications with
a hugely diversified domain. Web service regression testing
presents a set of challenges to the tester which need to be
overcome in order to provide a reliable performance of the
desired application. Code based regression testing approaches
present a lot of difficulties as the tester needs to know the
code which is in most cases not possible. In this paper, we
address a UML based regression testing method independent of
the code using test cases generated from use cases in the
context of a case study. |
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Title: |
Ultrasonic
tests on setting properties of cementitious systems |
Author (s): |
V. M.
Sounthararajan and A. Sivakumar |
Abstract: |
Continuous monitoring of strength gain in fresh
cementitious system is an important assessment for determining
the long term strength gain properties in concrete. The
present study is aimed to evaluate the setting characteristics
of fresh cementitious systems containing ordinary Portland
cement (OPC) and flyash blended cement. Also, the influence of
accelerators on the rate of strength gain in flyash concrete
was studied systematically. A fabricated plexiglass mould was
used to monitor the setting properties of fresh cement paste
using an ultrasonic pulse velocity at different time intervals
for different cementitious systems. The test results indicated
that the pozzolanic reaction of flyash in cement was enhanced
with the addition of accelerator. Also, a drastic reduction in
setting time was noticed for large replacement of flyash (40%)
at increased dosage of accelerator (upto 3%). However, the
rate of hardening was found to be consistently higher for an
optimum flyash replacement (30%) in cement with1% of
accelerator dosage and exhibited a highest compressive
strength of 42.21 MPa. It can also be concluded from the
ultrasonic pulse velocity test results that the cementitious
system containing 20% flyash in cement with the addition of 3%
accelerator dosage recorded a good improvement in the early
age strength. |
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Title: |
Strength
properties of geopolymer mortar containing binary and ternary
blends of bentonite |
Author (s): |
K. Srinivasan
and A. Sivakumar |
Abstract: |
Geopolymer based cementitious
binder is one of the recent findings in the emerging concrete
technology. The present study investigates the setting and
strength properties of geopolymer mixtures containing binary
combinations of bentonite-flyash, bentonite-cement, bentonite-silica-fume
and ternary blends of bentonite-flyash-lime. The effect of
lime and alkali activator (sodium hydroxide) on the
geopolymerisation of bentonite was studied systematically. The
experimental results showed that the initial and final setting
time of binary mixtures containing bentonite and silica fume
(5%) with alkali activator (NaOH) showed early setting time of
30 minutes compared to other geopolymer mixtures. It was also
noted that compressive strength of ternary mixtures containing
40% bentonite, 30% flyash and 30% lime (M16) attained the
maximum strength of 24.74 MPa at 28 days. The highest rate of
strength gain was observed at early curing period (7 days) for
the ternary mixtures (M14) consisting of 80% bentonite, 10%
flyash and 10% lime compared to other mixtures. It can be
realized from the experimental study that, geopolymerisation
reaction was effective for the specimens cured at 100°C hot
air oven. |
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Title: |
Phosphorus
solubilizing and IAA production activities in plant growth
promoting rhizobacteria from brazilian soils under sugarcane
cultivation |
Author (s): |
Rosangela
Naomi Inui - Kishi, Luciano Takeshi Kishi, Simone Cristina
Picchi, José Carlos Barbosa, Maria Teresa Olivério Lemos,
Jackson Marcondes and Eliana Gertrudes de Macedo Lemos |
Abstract: |
Plant Growth Promoting Rhizobacteria (PGPR) has
been used as a biofertilizer, bringing benefits to agriculture
as Phosphorus Solubilizing Bacteria (PSB), indole-acetic acid
(IAA) producers, and with other activites. The goal of this
report was the identification of PGPR from soils under
sugarcane crops by 16S rRNA sequencing, and the
evaluation of the ability of phosphorus solublizing and IAA
production by biological assays. The isolates of this work
were obtained from three areas of sugarcane crop from São
Paulo State, Brazil. All isolates came from rhizosphere soil,
and in a total of 60 isolates just 10 have showed high ability
in phosphorus solubilizing. The selection of PSB may be done
by phenotypic and/or genotypic characterization. Among ten
isolates Enterobacter sp. (FJ890899), Entrobacter
homaechei subsp. verschuerennii (FJ890998),
Burkholderia sp. (FJ890895), and Labrys portucalensis (FJ890891) were able to IAA production. |
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Title: |
Behavior of
high performance fiber reinforced concrete columns |
Author (s): |
Wasan Ismail
Khalil, Ikbal Naeem Gorgis and Zeinab Raad Mahdi |
Abstract: |
An experimental program was carried out in this
research to investigate the behavior of square short high
performance concrete columns with and without steel fiber under
concentric compression loading. The effect of concrete
strength, percent of longitudinal reinforcement, spacing of
lateral confined stirrups, volumetric steel fiber ratio and
aspect ratio of steel fiber on the uniaxial behavior of
reinforced HPC columns were presented and discussed. The
results show that adding discrete fibers to HPC mixtures in
reinforced concrete columns not only prevents the premature
spalling of the concrete cover but also increases the strength
and ductility of the axially loaded reinforced columns. More
confinement is required in HPC columns in comparison with that
normal strength concrete to achieve the desired post-beak
deformability. |
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Title: |
Experimental
investigation of performance, emission and combustion
characteristics of kirloskar TVI DI diesel engine using
diesel-ethanol-surfactant as fuel |
Author (s): |
R.
Parthasarathi, S. Gowri and C. G Saravanan |
Abstract: |
An experimental investigation is carried out to
analyze the effect of different diesel-ethanol blended fuels
on the engine performance, combustion and emissions, such as
Brake specific fuel consumption, Brake thermal efficiency
cylinder pressure, Heat release rate, oxides of nitrogen,
hydrocarbon and smoke density. The experiments were conducted
on a single cylinder four stroke water-cooled naturally
aspirated open chamber (DI) Kirloskar TVI diesel engine
fuelled with neat diesel and diesel-ethanol-Tween80
(Surfactant) blends at an injection pressure of 220 kgf/cm2
with constant speed of 1500 rpm at varying load condition. The
results indicate that the emulsified fuel decrease the
specific fuel consumption and increase the brake thermal
efficiency. This is due lower heating value of blended fuel.
Among the blends the D50 E40 concentrations shows the highest
oxides of nitrogen, Hydrocarbon and lowest smoke density were
obtained at maximum brake power of the engine. The cylinder
pressure and heat release rate are higher and recorded as 76
bar and 152 kJ/m3deg for D50 E40 blends than other
blends and neat diesel fuel. |
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Title: |
Meti-lis
model to estimate H2s emission rates from to lich river, Vietnam |
Author (s): |
Nguyen Huu
Huan, Nguyen Xuan Hai, Tran Yem and Nguyen Nhan Tuan |
Abstract: |
This paper assessed the water quality in To
Lich River through contaminated indicators such as DO, COD,
and BOD5. The emission of H2S from the
river water had impacted the ambient air quality in the
riparian areas of To Lich River in Hoang Liet Ward, Hoang Mai
District, Ha Noi City. The measured concentration of H2S
in ambient air in the riparian area varied within the range of
48.7 ± 23.1μg/m3. The H2S emissions rate
from wastewater in the To Lich River was estimated about 2,
828.0 mg/m/h. METI-LIS model can be applied to forecast H2S
emission rate from To Lich River. The predicted results showed
the close relationship with the measured values by correlation
coefficient R2 = 0.9197. |
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Title: |
FPGA based
fiber optic gyroscope signal denoising using discrete wavelet
transform |
Author (s): |
P. Rangababu,
K. Shravan Kumar and Samrat L. Sabat |
Abstract: |
This paper presents field
programmable gate array (FPGA) implementation of the
forward/inverse discrete wavelet transform for denoising Fiber
Optic Gyroscope (FOG) signal. In this work an extensive study
on the effect of different threshold techniques of DWT
algorithm are carried out denoising the FOG signal. Different
architectures such as multiply and accumulate (MAC),
Distributed Arithmetic (DA) and Systolic MAC are used to
implemented the DWT algorithm on XILINX Virtex-5FXT-1136 FPGA
development board. The resource utilization of all the three
architectures are compared and the experimental result
concludes that the DA architecture is the optimum architecture
that gives latency of 1057 clock cycles for processing 1024
samples with maximum operating frequency as 174 MHz. Further
the DWT algorithm reduces the drift by 5 and 100 times for
denoising the gyroscope and accelerometer signal of the
considered FOG. These results confirmed a DWT shows good
improvement of denoising for processing the noisy FOG and
accelerometer signal. |
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Title: |
Cost benefit
analysis in Kosmaç limestone deposit republic of Kosovo |
Author (s): |
S. Hyseni, B.
Durmishaj, A. Bytyqi, I. Alliu
and A. Berisha |
Abstract: |
In this
paper is present a functional model as very important for the
economic evaluation study in the deposits of carbonate rocks.
One such model is applied to mineral deposit limestone
“Kosmaç" which uses the company Doni Fert. So for a fair
assessment of investment in technology to acquire a cubic
meter of useful minerals, should question Benefit/Cost
Analyses (B/C) for these mineral resources in Kosovo. |
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Title: |
Experimental
study on emission and performance analysis of non edible rice
bran oil as an alternative fuel for direct injection diesel
engine |
Author (s): |
Prasad Baburao Rampure, C Venkataramana Reddy
and K Vijayakumar Reddy |
Abstract: |
The financial growth of the
country is measured by efficient use of natural resources
especially fuel. Fossil fuels have played a dominant role in
the rapid industrialization of the world and thereby increased
and improved quality of life. However, due to the threat of
supply crunch ever rising prices and the effect of green house
gases caused by conventional fuels there is an urgent need to
explore the possibility of using straight vegetable oils
(unmodified) as alternative fuels to reduce the pollution and
to increase the energy self-reliance of the country,
especially in rural areas. The study aims to investigate
experimentally the performance analysis of non-edible rice
bran oil, a straight vegetable oil [SVO] and its blends with
diesel as fuel and also to investigate the exhaust emission
characteristics in the single cylinder, direct injection, four
stroke diesel engines typically used in Indian agricultural
sector. Experiments were conducted by using the blends of
diesel with non-edible rice bran oil in various proportions
from ten to one hundred percentages by volume and at varying
engine loads. Studies have found that the use of blends of
more viscous non-edible rice bran oil and diesel in various
percentages result in the decrease in the NOX
emission while the brake thermal efficiency reduces
marginally. |
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Title: |
SAR reduction
in slotted PIFA for mobile handsets using RF shield |
Author (s): |
T. Anita
Jones Mary and C. S Ravichandran |
Abstract: |
This
paper proposes a multiband handset antenna combining PIFA and
novel slots on a radiating patch of PIFA for mobile
applications. Two slots were introduced in order to embody 900
and 1800 MHz band. Radiation patterns are computed in free
space as well as in the presence of the head. Specific
Absorption Rate (SAR) of the slotted PIFA antenna is
calculated and is compared with the SAR limits in the safety
standards. SAR is investigated,
by discussing the effect of
RF shield which is introduced between the
slotted PIFA antenna and head. Simulation results show that
with the introduction of the RF shield of thickness of 1mm,
SAR reduces by 12%. All simulations are done in FEKO software. |
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Title: |
Rainfall
intensity variation for observed data and derived data - a case
study of Imphal |
Author (s): |
Zameer Ahmed,
D Rammohan Rao, K. Ram Mohan Reddy and Ellam Raj |
Abstract: |
For estimation of runoff
especially for urban areas short duration rainfalls are
necessary. However especially in developing countries like
India availability of short duration rainfalls is scarce and
data available is mostly for daily rainfall data. In such
cases determination of design rainfall is becoming an
approximation and thus leading to frequent failure of drainage
network and subsequent floods. In the absence of short
duration rainfall data, data is generated for short durations
like 1hr, 2hr, 3-hr, 6-hr and 12-hr rainfall values were
obtained using an Indian Meteorological Department (IMD)
empirical reduction formula is used in the absence of observed
data (t-hour rainfall). Frequency analysis was then carried
out to establish Intensity-Duration-Frequency (IDF)
relationships. In the present study an attempt has made to
find the difference of intensity of rainfalls obtained from
observed data and derived data by taking Imphal rainfall data
which is available for 15 min time interval. |
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Title: |
Maintenance management for public
infrastructure for Malaysian local authorities |
Author (s): |
Hamimah Adnan, Zafrul Fazry Mohd
Fauzi, Ismail Rahmat and Azizan Supardi |
Abstract: |
Proper and timely maintenance
and rehabilitation of facilities is essential for safe
operations and the overall economics. Decisions as to what,
where, when, and how maintenance and rehabilitation should be
performed need to be made. These decisions must consider
condition, but budget constraints and other tangible and
intangible issues also affect the decision-making process.
However, this public satisfaction level is unachieved due to
lack of proper facilities management and lack of awareness
among the local authorities’ staffs in Malaysia. This research
investigates current implementation in maintenance management
and to make recommendations to improve infrastructure
maintenance management in Malaysian local authorities Through
the interviews and questionnaires that are directly being
conducted with the maintenance personnel give a clearer
picture on the problems arise by the maintenance personnel in
local authorities during carrying out their infrastructure
maintenance work. Approach used by most of the local
authorities in taking action on the maintenance of
infrastructure works are almost the same except their
different ways of selecting or appointing the contractors are
a bit different. Views from the maintenance personnel
regarding the obstacles arise in carrying the maintenance
works has to be address correctly, so that the maintenance
works for the infrastructure facilities are to be carried out
effectively. |
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Title: |
Characterization on the strength properties of pelletized fly
ash aggregate |
Author (s): |
P. Gomathi
and A. Sivakumar |
Abstract: |
The present study focused on the
production of alkali activated flyash lightweight aggregate by
means of pelletization. The basic physical properties and
mechanical characteristics of lightweight aggregate produced
were analyzed systematically. Factors affecting the efficiency
of pelletization process such as type of binder, moisture
content, process duration and alkali content were evaluated.
Further, characterization of aggregates was evaluated based on
the specific gravity, gradation, density and aggregate
crushing strength. It was observed from the test results that
the pelletization efficiency of different aggregates was found
to be maximum when the angle of pelletizer is set to 36º with
an optimized speed of 55 rpm. Also, compared to other types of
pelletized flyash aggregates, the aggregates containing flyash
mixed with 20% cement and 12M NaOH exhibited a higher crushing
strength of 13.72 MPa with minimum water absorption of 18.33%.
With the optimum addition of water upto 31% during
pelletization, the efficiency and strength of aggregates were
found to be increased. In addition, the optimum pelletization
duration (15 to 20 minutes) resulted in higher compaction
energy with uniform size of aggregates. Also, the addition of
alkali (NaOH) to flyash aggregates showed higher strength gain
within shorter curing period in hot air oven. |
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