INTEK: Jurnal Penelitian
INTEK: Jurnal Penelitian sebagai wadah komunikasi ilmiah antar akademisi, peneliti dan praktisi dalam menyebarluaskan hasil penelitian. Jurnal INTEK Terbit 2 Kali dalam setahun yaitu pada Bulan April dan Oktober, dan memuat hasil-hasil penelitian dalam bidang Rekayasa Teknik Mesin, Rekayasa Teknik Energi, Rekayasa Teknik Elektro, Rekayasa Teknik Komputer, Rekayasa Teknik Kimia, Rekayasa Teknik Sipil. Jurnal INTEK adalah jurnal elektronik yang dikelola oleh Politeknik Negeri Ujung Pandang mengundang para peneliti dan praktisi untuk mengirimkan naskah ke INTEK. Proses Peer Review dilakukan setiap naskah yang masuk akan direview oleh dua orang reviewer. Jurnal INTEK juga telah bekerjasama dengan Ikatan Ahli Teknik Ketenagalistrikan Indonesia (IATKI).
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<![CDATA[Analysis Of Mechanical Properties SMAW (Shielded Metal Arc Welding) Welding Joints Of Portable Electric Hydraulic Jack Frame ]]>
<![CDATA[Andika Wisnujati]]>;
<![CDATA[Juni Andryansyah]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 7, No 2 (2020): October 2020 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v7i2.2134
<![CDATA[Welding is a very important part of the development and growth of the industry because it has a role in engineering, reparation, and construction. Shielded Metal Arc Welding (SMAW) or the conventional arc welding process is particularly dominant in structural joints, pressure vessels and in maintenance and repair work. In welding, different metals are joined economically and at a much faster rate as compared with other fabrication processes like riveting and casting. The purpose of this research is to find out the cooling media cooler against SMAW smelter tensile strength by using the E6013 electrode. This study uses low carbon steel material that has levels Fe = 98,3%; C = 0,30%, Si = 0,23%. The material is given 75A welding current with cooling variation on the connection result using oil, water, and room temperature. The highest tensile stress value obtained in the oil cooling treatment was 844,76 N/mm2, the highest strain value was obtained on the raw materials of 16%, the highest elasticity value was obtained in the oil cooling treatment of 703.96 N/mm2. According to the research results can be concluded that the variations of cooling media greatly affect the strength of the welding connection.]]>
<![CDATA[Groundwater Pumping Management in Controlling Seawater Up-Coning in The North Coastal Area of Makassar ]]>
<![CDATA[Sugiarto Badaruddin]]>;
<![CDATA[Akhmad Azis]]>;
<![CDATA[Muhammad Fadhil Ashari]]>;
<![CDATA[Miftahul Jannah]]>;
<![CDATA[Ilham Ali]]>;
<![CDATA[Muhammad Ihsan]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 7, No 2 (2020): October 2020 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v7i2.2634
<![CDATA[In big cities, communities generally consume clean water from local water supply company which uses surface water sources. However, due to the limitations of the company in supplying water, particularly in the dry season, an alternative is required, such as using groundwater without causing over-exploitation. This study aims to determine the optimal rate of groundwater pumping in the coastal aquifer to avoid seawater up coning using SEAWAT V.4 numerical model. The research method was carried out using a GEO-7X GPS device to obtain coordinate's location, land elevation and observation well distance from the coastline. Secondary data in the form of aquifer thickness data and geological map of the site were obtained from previous studies. The salinity test results show that the average salinity value of the ten water samples from observation wells is 36.8 mg/l, which means that the water is categorized as non-saline water (freshwater). These data are in line with the groundwater utilization monitoring activity report of Makassar City Environment Office in 2018, which reported that Ujung Tanah and Wajo Districts were found to be free from seawater intrusion. Even so, the potential for seawater intrusion is still considered high because of the location of community groundwater wells are near from the coast. One of the efforts to prevent seawater up coning is by limiting groundwater pumping. From the numerical modeling results, it is found that the maximum groundwater discharge in the research site, namely P3 is 20% of total flow rate(0.3 m3/day), P5 is 20% (1.32 m3/day), P6 is 40% (0.52 m3/day) and P10 is 20%(0.63 m3/day).]]>
<![CDATA[Public Transport Mode Model Selection for public Transport Users in the City of Makassar Based on the Change of Speed Travel Variables ]]>
<![CDATA[Syahlendra Syahlendra]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 7, No 2 (2020): October 2020 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v7i2.2682
<![CDATA[The increasing number of private vehicles shows that the public transportation system in Makassar has not been maximized. this is also due to the absence of other alternative public transportation modes that can be used by the community in their activities. This study aims to determine the preference of public modes of choice if offered other alternatives, especially public transport with greater capacity. Public transportation offered in this study is busway and monorail. In this study the community was faced with 3 modes of choice namely city transportation, monorail, and busway. The data collection method used was a survey with stated preference based questionnaires, which reviewed nine conditions for variable change in travel speed. The construction of the model was carried out using STATA software and city transportation was used as the base outcome. The model is based on discrete selection models and is analyzed by the multinomial logit model. The results showed that in the nine conditions of change in travel speed, the mode of city transportation was still more dominantly chosen by the community.]]>
<![CDATA[Influence of Curing Conditions on Strength Characteristics of Sea Sand Mortar ]]>
<![CDATA[Irka Tangke Datu]]>;
<![CDATA[Adiwijaya Ali]]>;
<![CDATA[Nur Aisyah Jalali]]>;
<![CDATA[Khairil Khairil]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 7, No 2 (2020): October 2020 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v7i2.2720
<![CDATA[This present paper aims to investigate strength characteristics of cement mortar using natural sea sand as fine aggregate in different curing conditions. Research was carried out with making mortar mixtures by two types of cement, Portland Composite Cement (PCC) and Pozzolana Portland Cement (PPC) with tap water as mixing water. Characteristics of fine aggregate and strength of cement mortar use river sand (RS), sea sand (SS), and washed sea sand (WS) were observed. Further, specimens of cube mortar in size of 50 mm x 50 mm x 50 mm of six mortar mixture series were casted according to Indonesian Standard. At 24 hours after cube specimens were casted, cube mortar specimens were cured in three curing conditions such as tap water curing (TC), seawater curing (SC) and air curing (AC). After curing at certain period (3-day, 7-day, 14-day, and 28-day), cube mortar samples were tested in compressive strength. Results concluded that sea sand aggregate improve characteristic of mortar in compressive strength up to 28 days in all curing conditions, and there was no significant effect of type of curing water (TC and SC) on 28-day strength performance of mortar was obtained. In addition, sea sand could potentially be utilized as an aggregate in production of mortar and/or concrete.]]>
<![CDATA[Design of Microcontroller Based Fire Detector with Output Warning SMS Information and Automatic Extinguisher ]]>
<![CDATA[Abdul Zain]]>;
<![CDATA[Rudi Hartono]]>;
<![CDATA[Sri Handani W]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 7, No 2 (2020): October 2020 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v7i2.2639
<![CDATA[Conflagration is an unpredictable tragedy. It may occur whether in the woodland areas or in the residential areas. Typically, it would only be recognized if indeed the flames spread and the smoke intensified. This study aims to detect fires using the MQ-2 smoke sensor, DS18b20 temperature sensor, and fire sensor. Using Arduino Uno as the controller, this system’s output is in the form of an alarm buzzer, Short Message Service (SMS) information using SIM800L, and an automatic fire pump. This system operates to detect the temperature shifts, the smoke concentration and the existence of a fire point which triggers an alarm in the form of a siren if two out of the three sensors are activated. It, then, sends information by Short Message Service (SMS) and automatically triggers the pump as the result. The fire sensor can detect hotspots with a maximum distance of 80 cm and the DS18b20 temperature sensor has an average reading error of 0.27 ° C with a maximum reading error of 0.5 ° C. The MQ-2 smoke sensor can detect smoke where the change in smoke concentration is directly proportional to the sensor output voltage. There are three conditions to determine fire conditions, namely the temperature sensor reads more than equal to 55 ° C and the fire sensor is active, or the temperature sensor reads more than equal to 55 ° C and the smoke sensor reads more than equal to 1000 ppm, or the fire sensor is active and smoke sensor reads greater than equal to 1000 ppm.]]>
<![CDATA[Adaptive Power Charge Using PID Controller on DC Load Application ]]>
<![CDATA[Farid Dwi Murdianto]]>;
<![CDATA[Indhana Sudiharto]]>;
<![CDATA[Irianto Irianto]]>;
<![CDATA[Ayu Wulandari]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 7, No 2 (2020): October 2020 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v7i2.2652
<![CDATA[Battery is a very important necessity as an electrical energy storage for DC load type. However, as electric energy storage, the battery has a limit storage capacity. The battery must be recharged when the electrical energy stored in the battery has been exhausted to keep the DC load in operation. Unfortunately, batteries in different types of DC loads have different voltages and capacities. So for charging the battery also requires a different voltage. While the existing battery charger is generally static specifically for one type of battery. From this problem, the paper proposed an adaptive power charge system. A system that can adaptively charge electrical energy on batteries that have different voltages and capacities through one port. The converter used in this paper is the buck converter to lower the output voltage from the input voltage. The system uses tracking duty cycle to know the type of DC load. After knowing the type of dc load then the system determines the setting point voltage. To keep the output voltage stable, the system uses PID control. With this adaptive power charge, the charging process will be more efficient and multifunction because it can be used for various types of DC load. The system can provide an output voltage of 19 volts when connected to a laptop and provides an output voltage of 5 volts when connected to a mobile phone on setling time 10ms.]]>
<![CDATA[The Effectiveness of Kesum Leaves (Polygonum Minus) In Reducing of Free Fatty Acids In Used Cooking Oil ]]>
<![CDATA[Gervacia Jenny Ratnawaty]]>;
<![CDATA[Ratih Indrawati]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 7, No 2 (2020): October 2020 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v7i2.2715
<![CDATA[This study aims to determine the effect of adding kesum leaves (polygonum minus) to used cooking oil on reducing levels of free fatty acids. This type of research is quasi experimental. The population in this study is used cooking oil and the sample used is used cooking oil that has been added with the leaves of kesum with 5 treatments and replicated 5 times so that the total sample is 25.From the results, it was found that the average reduction in free fatty acid levels in used cooking oil before adding the leaves of kesum was 7,12%, which had added kesum leaves as much as 20 grams of 6.93%, 40 grams of 5.36%, 60 gr at 3.93%, 80 gr at 3.26% and 100 gr at 1.62%. The results of the analysis using linear regression test, it is known that the addition of 20 grams and 40 grams of p-value is 0.026 and 0.021 (p <0.05), respectively, so Ha is accepted, that is, there is a relationship between the effectiveness of leaves of kesum (polygonum minus) in reducing levels of fatty acid numbers. free of used cooking oil, namely the addition of 20 and 40 grams. Whereas in the addition of 60, 80 and 100 grams of kesum leaves there was no relationship that was shown with a p value> 0.05.]]>
<![CDATA[The Use of Nutmeg Shell as a Lightweight Concrete Material ]]>
<![CDATA[Budiman Budiman]]>;
<![CDATA[Imran Imran]]>;
<![CDATA[James WTP]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 7, No 2 (2020): October 2020 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v7i2.2640
<![CDATA[Lightweight concrete is concrete that has a lighter density than concrete in general. Nutmeg shell utilization as coarse aggregate is expected to be the added material in the lightweight concrete mixture. The purpose of this study is to determine characteristics of the concrete aggregate and the compressive strength of the concrete design based on the DOE (Department of Environment) method and the SNI Standard. In this research, the use of nugmet shell was varied as follows: 10%, 20%, 30%, 40% and 50% of the concrete weight. The research result shows that the amount of nugmet shell used into the concrete mixture affects the compressive strength of the concrete characteristics (fck’). The compressive strength of the concrete characteristics increases with the increase in the amount of nutmeg shell used in the concrete mixture. The compressie strength increases consecutively from 28.42 kg /cm2, 31.65 kg / cm2 to 32.68 kg /cm2 with the increase in the amount of nutmeg shell: 10%, 20% and 30%. Then, it decreases into 29 , 09 kg /cm2 and 27.38 cm2 with further increasing 40% and 50% nutmeg shell of the concrete weight. The average weight of the concrete mixture using nutmeg shell was 1202 kg/m3with the maximum compressive strength value of 3.2 MPa, thus it could be categorized as the lightweight concrete. ]]>
<![CDATA[Coconut Water as Organic Inhibitor on Corrosion of Low Carbon Steel in 3.5% NaCl Solution ]]>
<![CDATA[Ramang Magga]]>;
<![CDATA[Muhammad Zuchry]]>;
<![CDATA[Yusnaini arifin]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 7, No 2 (2020): October 2020 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v7i2.2690
<![CDATA[Investigating coconut water as inhibitors to protect low-carbon steel from corrosion in 3.5% NaCl has been studied by weight loss method. The weight loss of steel was identified by immersion test. The coconut water used was young and old coconut water. The concentration of coconut water, whether young and old, in 3.5% NaCl was varied. The results showed that the corrosion rate of steel decreased with increasing coconut water concentration. Furthermore, old coconut water can further reduce the rate of corrosion in mild steel comparing young coconut water.]]>
<![CDATA[Effect of FSW Heating Base Temperature on Tensile Strength and Hardness of AA 1100 Welds ]]>
<![CDATA[Syamsul Hadi]]>;
<![CDATA[Agus Setiawan]]>;
<![CDATA[Pipit Wahyu Nugroho]]>;
<![CDATA[Adi Dwi Hermansyah]]>;
<![CDATA[Anas Nur Alfisahri]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 7, No 2 (2020): October 2020 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v7i2.2623
<![CDATA[The research objective was to determine the effect of heating base temperature on tensile strength and hardness of AA 1100 welds in Friction Stir Welding (FSW). The research methodology includes preparing work pieces of size 150 mm x 100 mm x 3.6 mm from aluminium alloy AA1100 series, making work piece clamps that are suitable for the milling machine used, preparing heating plates 500 Watt for FSW, preparing tools from AISI-H13 material with a shoulder diameter of 20 mm and pin size of M5 x 3.4 mm for FSW, the implementation of FSW with a rotating speed of 1750 rpm and translation speed of 10 mm/minute, preparing hardness test specimens, preparing tensile test specimens refers to ASTM E8-13a, and data analysis of hardness test and tensile test results. The FSW results show that the hardness value increases with the increase in the width of the heating plate linearly for a temperature of 200oC from 10 mm to 30 mm which indicates better conditions, meanwhile decreases at a temperature of 175oC for heating plate width from 10 mm to 20 mm, but increases to 30 mm which is different for the temperature of 250oC and temperature of 300oC which have increased from 10 mm to 20 mm, but decreases towards 30 mm, and than the correlation between AA 1100 tensile strength and surface hardness of 3 heating plate widths is shown with the function of tensile strength, s (MPa) = -0.9699 x surface hardness (HV) + 102.01.]]>
