Jurnal ITATS

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VAPOR IDENTIFICATION SYSTEM USING QUARTZ RESONATOR SENSOR ARRAY AND SUPPORT VECTOR MACHINE

ABSTRACT
It has been developed a vapor identification system using gas sensor array and Support Vector Machine (SVM)
pattern recognition. Sensor array consists of several quartz resonator sensors coated with different polymer materials in
order to have a specific pattern to the vapor. In this study, the Field Programmable Gate Array was used as counters and
other functions to interface the sensor array with a computer. Frequency change was measured by a counter with a period
of one second. Vapors used in the experiment were kerosene, methanol, gasoline and alcohol. The data analysis was taken
from the frequency changes after vapor injection. Sensors were cleaned to get the initial condition using nitrogen gas. For
vapor data collecting, the measurements were performed eight times for each sample. The set of digital data was then
stored as a database. Principle Component Analysis was used to visualize the performance of the sensor array to
discriminate each vapor. The set of vapor pattern obtained by the sensor array was then identified by SVM algorithm.
Experiment results showed that the SVM could identify each vapor with a success rate of 97.2%. The results of this study
will be used for further research to detect the low concentrations of vapors contained in human breath for medical
diagnoses.
Keywords: quartz resonator sensor array, SVM, vapor identification.

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jeas_1214_1350_Hary Agus

IMPLEMENTATION OF WIRELESS MOBILE SENSOR BASED ON FUZZY LOGIC CONTROL FOR LPG GAS PIPELINE LEAKAGE MONITORING

ABSTRACT
The main purpose of the leakage detection system on a gas pipeline is to give a warning of the dangers related to
a gas leak that could endanger human lives and cause material loss. There is a wide range of gas detection systems used to
provide an early detection and warning in the event of a leak in a gas pipeline, one of which that is wired monitoring
system. However, in its implementation, the wired-based monitoring system has many shortcomings. To overcome the
disadvantages of the wired monitoring system, a wireless-based sensor network in detecting and monitoring gas pipelines
is applied in this study by implementing mobile sensors as key components of the data collection. LPG mobile sensors
used in this study are equipped with a pipe tracking algorithm based on fuzzy logic control algorithm, so they can easily
track and monitor the installation of a gas pipeline. Fuzzy logic control achieves a success rate of 70%. The overall system
testing results in the average error of 18.5%, indicating that the mobile wireless sensors can already detect leakage in LPG
gas pipelines.
Keywords: mobile sensors, pipe tracking, TGS2610 Gas sensor.

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jeas_1214_1349_Riny Sulistyowati

BIOFUEL PRODUCTION FROM CANDLENUT OIL USING CATALYTIC CRACKING PROCESS WITH ZN/HZSM-5 CATALYST

ABSTRACT
Biofuel is an alternative energy product that is environmentally friendly. Biofuel production is one of resolving
the problems of energy shortage and global warming. This research aims to study the process of biofuel production from
candlenut oil. The research was carried out by reacting the candlenut oil in a micro fixed bed reactor with diameter of 1 cm
and length of 16.4 cm. Catalytic cracking method with Zn/HZSM-5 catalyst was used in this process. The effect of reactor
temperature and nitrogen flow rate on the quality of biofuel was studied. Biofuel products were analyzed using Gas
Chromatography. Biofuel composition is obtained by comparing the chromatogram of biofuels to the standart
chromatogram. The result proves that biodiesel was the highest fraction of biofuels. The highest percentage of biodiesel
was 80.75 % at a temperature of 325 °C and a nitrogen flow rate of 60 ml/min. Biofuel density was in the range of 0.81 to
0.84 g/ml. This biofuel had a cetane number of 74.8. Biofuel had octane number of 124.7, 114.7, and 119.7 using RON,
MON, and AKI methods respectively. Biofuel had higher heating value of 19.269 btu/lb. Cetane number of biofuel was 46,
7% greater than that of fuel European Standard EN 590. This product can be recommended as a cetane improver.
Keywords: biofuel, candlenut oil, cetane, improver, Zn/HZSM-5.

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jeas_1114_1304_agus budi

CLAY SOIL STABILIZATION WITH LIME EFFECT THE VALUE CBR AND SWELLING

ABSTRACT
Subgrade was a very important part to support all construction loads on it. If the clay subgrade that had
unfavorable properties, such as low CBR, the high swelling when applied to the construction of the road subgrade soil
would produce a soil that is easily damaged. For that, if used in the construction of CBR value should be towering so that
it can withstand a load on it. The swelling would reduce the volume of soil that is stable when it rains the soil is not
swollen, otherwise when the dry season does not shrink too high. Ground improvement methods used in this study was
stabilization of lime-soil, using a mixture of percentage 5%, 10% and 15% of the lime. Tests performed on the Atterberg
limits, Compaction (Standard Proctor Test), C.B.R laboratory, and Swelling. The results of the study about a large
percentage of the value of lime plasticity (liquid limit, plasticity index) decreased with the increasing compaction. The
average CBR value is increased for the natural soil to percentage 5% and 10% of lime, while the percentage of 15%
decreased. For the swelling, the percentage of 15% lime with 24 hours immersion showed 45.28% increase in swelling of
the normal soil (i.e. 31.67% to 17.33%) So in general the best for clay soil stabilization is Pakuwon area where the
addition of 10% lime CBR values obtained optimum and could reduce swelling value.
Keywords: lime, stabilization, CBR, swelling.

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jeas_1014_1244___gati

STUDY THE USE OF ADDITIONAL MATERIALS TO IMPROVE QUALITY CONCRETE USING THE SAND WITH HIGH LEVELS SLUDGE

ABSTRACT
With the increasing use of concrete in the construction industry, the more the effort to make it. According to ISO,
the sand used for the concrete mix should not contain levels of sludge, which is more than 5%. In reality, however, the
field-level implementation sludge contained in the sand for the concrete mix is often overlooked, because to achieve a level
of mud that is less than 5% sand, must be washed first. For washing the sand in large quantities will require plenty of water
and quite a long time. Previous researchers conducted a study on the effect of aggregate mud content; the quality of the
concrete, the results obtained from these studies that the mud content of 7% to 20% decreased the compressive strength of
concrete is not too significant to normal, with the percentage decrease of 0.432%, 0.996 %, 2.847%, 4.858%. Based on the
findings above, this time researchers will conduct experiments with the manufacture of concrete mixtures in the laboratory
using additional materials such as cement and fly ash with a percentage based on the excess mud contained levels on a
sand. The test specimen used in the form of the cylinder size 150mm x 300mm, used sand containing mud content of 18%
and 20%, in which the experiment makes 5 Variations specimen, variation 1 by adding 13% of cement by weight of
cement to the sand with 18% mud content, variation 2 by adding 15% cement, 20% for mud levels. Variation 3 adds the fly
Ash 13%, while variation 4 adding 15% fly ash. For variety of 5, use sand containing mud with content of 3.6% as a
comparison for Normal Concrete. The result showed an average compressive strength of concrete for variation 1 is
22,45Mpa the medium compressive strength of concrete for variation 2 is equal to 21.90 MPa. Then the mean compressive
strength of concrete of variation of 3 is equal to 25.14 MPa. Next the mean compressive strength of concrete is equal to
28.20 MPa for variation 4. Finally, the compressive strength of concrete for variation of 5 is equal to 21.94 MPa. Thus
variation 1 has increased the compressive strength of concrete by 2.32%. Variation 2 decreased by 0.18%. Variation 3 an
increase of 14.58%. Variation 4 an increase of 28.53% against the normal concrete (Variation 5)

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jeas_0914_1209_DEWI-PERTIWI