IPTEK The Journal of Engineering
IPTEK The Journal of Engineering (E-ISSN: 2337-8557) is an academic journal on the issued related to engineering and technology. IPTEK The Journal of Engineering published first time in August 2014. From 2014-2018 (Volume 1-4) IPTEK The Journal of Engineering publish three issues (numbers) annually (April, August, and December). Since 2019 published annually in April and August. It is open to all scientist, researchers, education practitioners, and other scholars. Therefore this journal welcomes various topics in different engineering disciplines. Our target is to reach all universities, research centers and institutes in the globe. Call for Papers IPTEK The Journal of Engineering is an open-access journal, which means that visitors all over the world could read, download, cite, and distribute papers published in this journal for free. We adopt a peer-review model, which insured fast publishing and convenient submission. In addition to peer-reviewed original research papers, the Editorial Board welcomes original research reports, state-of-the-art reviews and communications in the broadly defined field of engineering science and technology. Theses, dissertations, research papers, and reviews are all acceptable for publication. All topics should relevant to the issues faced by industries, governments, and communities. The broad-based topics may be covered by the following knowledge areas: Computer Engineering and Information Systems (Telematics, Algorithms and Programming, Network Based Computing, Smart Computing and Vision, Intelligent Information Management, Computer Architecture and Networking, Applied Modeling and Computing, Graphics Interaction and Games, Software engineering, Information Technology Infrastructure and Security, Information Systems Management, Data Engineering and Business Intelligence, Data Acquisition and Information Dissemination, Enterprise System, and Smart Cities and Cyber Security) Civil Infrastructure Engineering (Hydrotechnics and Surveying, Construction Implementation Management, Building Materials and Structures, and Transportation and Geotechnics) Mechanical Engineering (Energy Convertion, Metallurgical and Materials Engineering, Mechanical Design, and Manufacture) Electrical Engineering Automation (Cyber Physical, Automation, and Industrial Robots, Programmable Logic Controller and Control System, Antennas and Propagation, Instrumentation, Measurement and Power System Identification, Multimedia Telecommunications Network, Multimedia Communication, Electric Energy Conversion, Electric Power System Simulation, High voltage, System and Cybernetics, Microelectronics and Embedded Systems, Biocybernetics, Instrumentation and Biomedical Signal Processing, Multimedia Computing and Machine Intelligence, and Digital Signal Processing) Chemical Engineering (Applied Chemistry, Biochemical and Bioprocess, Advance Functional Materials and Analysis, Thermodynamic, Chemical Reaction, Material and Nanocomposite, Bioenergy, Wastewater Treatment, Process Integration, Fluid Mechanic, and Sustainable Industrial Systems) Instrumentation Engineering (Control Instrumentation, Measurement Instrumentation, Photonic Engineering, Vibration and Acoustics, and Embedded Systems and Physical Cyber) Business Statistics (Business Analytic, and Quality and Productivity Engineering) And physical, chemical, biological, and environmental sciences that are directly related to engineering.
Articles
96 Documents
<![CDATA[Influence of the Compression Ratio and Duration Injection on Performance and Emission of Sinjai Engine Type Flexible Fuel Engine 150 cc Fueled Bioethanol E70 ]]>
<![CDATA[Hanapi Hasan]]>;
<![CDATA[Bambang Sudarmanta]]>;
<![CDATA[Marthen Paloboran]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 3, No 3 (2017) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v3i3.a3167
<![CDATA[In this study, the effects of using gasoline (E0) and gasoline-ethanol blends E70 on engine performance and exhaust emissions have been experimentally investigated. The investigation was conducted on a single-cylinder, four-stroke, spark ignition engine. The experiments were performed by varying the compression ratio and duration injection (100%, 125%, 150%, 175% and 200%) at a speed of 2000 up to 8000 rpm at full open throttle. The experimental results showed that blending gasoline with ethanol slightly increased the torque and decreased carbon monoxide (CO) and hydrocarbon (HC) emissions. It was also found that blending with ethanol allows increasing the compression ratio without knock occurrence]]>
<![CDATA[Development of ECU (Electronic Control Unit) to Maintain Stability of Biogas Fuelled Generator ]]>
<![CDATA[Totok Soehartanto]]>;
<![CDATA[Dwi Nur Fitriyanah]]>;
<![CDATA[Putri Yeni Aisyah]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 6, No 2 (2020) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v6i3.a7264
<![CDATA[Biogas fueled generator has a unique character because the converter kit on the generator has the characteristic of absorbing the biogas supply. Therefore, in this study, biogas is accommodated in a plastic container equipped with a valve that can adjust the amount of biogas supply pressure. Combustion in the Genset combustion chamber will occur if the ratio of air supply and supply of biogas (AFR = Air to Fuel Ratio) meets the stoichiometric number. So a ratio control is needed on air supply and biogas supply, which can follow changes in biogas conditions in plastic bags and generator loads. For this reason, this paper presents an ECU (Electronic Control Unit) that can regulate the ratio of air supply to biogas supply by using a servo motor valve, which is commanded by a control signal from the ECU. The resulting ECU prototype is equipped with a multi-input connector (to receive the signal output of CH4 methane gas sensor and the biogas supply pressure sensor), multi-output (control signal to the servo motor valve), and multi regulators to adjust the Set Point value for the methane gas content CH4, the value of the set point of the biogas supply pressure and to tune the value of the proportional gain control (KP). The results of the ECU performance test by trial and error by giving a dummy input signal (analogy to the signal output of methane gas sensor and the analog of the pressure sensor output signal in the form of an electric voltage generated from the signal generator) can drive the servo motor, valve air supply, and servo motor, valve supply biogas. Accordance with the gain control input from the regulator. ]]>
<![CDATA[Performance of Seawater Activated Battery as Alternative Energy Resources ]]>
<![CDATA[Masrufaiyah Masrufaiyah]]>;
<![CDATA[Ridho Hantoro]]>;
<![CDATA[Gunawan Nugroho]]>;
<![CDATA[Totok R Biyanto]]>;
<![CDATA[Nur Laila Hamidah]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 3, No 1 (2017) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v3i1.a2266
<![CDATA[Research on Freshwater and Seawater batteries, which using Al and Cu electrodes at variation of different electrolyte salinity, distance between electrodes and flowrate of electrolyte has been carried out. The galvanostatic discharge and Electrochemical Impedance Spectroscopy (EIS) of Al and Cu in seawater were investigated. The results showed the optimum condition with significant average potential discharge of 45,02 mV and current of 0,440 mA obtained from combination of 5% electrolyte salinity, 2 cm space between electrodes and 0,5 liter/hour electrolyte rate. EIS studies revealed that the Al and Cu interficial electrochemical process in seawater was determined by an activation controlled reaction]]>
<![CDATA[Modeling Risk Factors for Total Paralysis of Stroke Patients in RSUD Dr. R. Sosodoro Djatikoesoemo Bojonegoro Using Binary Logistic Regression ]]>
<![CDATA[Puji Hidayatus Sholikhah]]>;
<![CDATA[Sri Pingit Wulandari]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 6, No 1 (2020) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v6i2.a7225
<![CDATA[One of the causes of death in Bojonegoro Regency is stroke. Stroke is a nervous system function disorder that occurs suddenly and is caused by circulatory disorders of the brain. From 2015 to March 2018, stroke has always been ranked first as the type of disease that most patients suffer in RSUD Dr. R. Sosodoro Djatikoesoemo Bojonegoro. Stroke can cause sufferers to experience limited ability to carry out daily activities (eating, dressing, defecating, bathing, and moving) because there are limbs that are paralyzed so it is difficult to move. Therefore, this study aims to describe the characteristics of stroke patients and to analyze the risk factors that cause stroke patients get totally paralyzed using binary logistic regression. The data used in the form of secondary data obtained from the results of medical records of stroke patients who were hospitalized at RSUD Dr. R. Sosodoro Djatikoesoemo Bojonegoro from January to March 2018. Based on the results of the analysis showed that the majority of stroke patients are over 55 years old and males also the risk factors that cause stroke patients geet totally paralyzed are the type of stroke and previous history of stroke.]]>
<![CDATA[Auto Berthing – a Solution for Achieving Zero Waiting Time at Harbour ]]>
<![CDATA[Aulia Siti Aisjah]]>;
<![CDATA[A A Masroeri]]>;
<![CDATA[Aries Sulisetiyono]]>;
<![CDATA[Randika Gunawan]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 1, No 1 (2014) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v1i1.a477
<![CDATA[Tanjung Perak Port is one of biggest harbour in Indonesia. The shipping start from Karang Jamuang to Naval Base. The moving is use help of scout ships and tug boat. A control system can be applied to anchored ships , to replace the role of tug and scout boat. Movement from the parking position to the anchored involve auto maneuver and auto berthing. Both auto system is designed using fuzzy logic control. Input of control from sensors and guidance according to the path leading to the dock, and to anticipate the environmental disturbance factors (that is ocean currents). Control rules are unique, according to the type and size of vessel. In the case study to AHTS vessels, berthing auto show good ability. The heading error of 0.04° to the direction parallel to the dock, and the range of distances error is 0.16 to 2.16 meters from the desired position. Reduction of processing time leaning point to Jamrud dock is 33 minutes.]]>
<![CDATA[The Effect of Fan Blade Radiator Gas Turbin Generator Angle on Auxiliary Cooling Water System Performance ]]>
<![CDATA[Erryawan Kusuma]]>;
<![CDATA[Agus Sigit Pramono]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 5, No 1 (2019) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v5i1.a5023
<![CDATA[Auxiliary Cooling Water System (ACWS) on Gas turbine Blok 1 No 3 Muara Karang has declined its reliability because of 4 fan radiators must be operated due to increasing ambient air temperature and increase inspection interval from 8000 to 32.000 EOH after Upgrade in turbine part. This study aims to optimize Radiator ACWS performance by increasing the cooling fan air mass flow by changing the fan blade angle so it can be operated with 3 fan on and 1 fan standby. This research began with taking data each measurement at 11°, 13°, 15°, 17°, and 19°. Then, it will simulated by software to know the influence of air mass flow addition due to the change of the blade fan angle to the radiator water outlet temperature and to know the input operating parameters when the temperature outlet radiator is 46°C. The results of this study is validation of experimental and numerical data calculations that have errors below 5%. The maximum angle of fan blade can be set until 19°. At 16.7° with operation 3 of 4 fan on, radiator temperature output is 46° and heat disposed is 627.2 kW where this value is the same value as the current condition.]]>
<![CDATA[Effect of Holding Time and Cooling Medium on Microstructure and Hardness of AISI 8655 in Hardening Process ]]>
<![CDATA[Alvian Toto Wibisono]]>;
<![CDATA[Mavindra Ramadhani]]>;
<![CDATA[Rochman Rochiem]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 4, No 3 (2018) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v4i3.a4280
<![CDATA[The microstructure transformation of AISI 8655, affecting to hardness and impact properties in various hardening processes, has been investigated in this work. AISI 8655 specimens which had been prepared before hardening processes were heated to austenite temperature and held for 30 minutes and 60 minutes then continued by rapid cooling in various medium (air, oil and water). The hardened steel specimens were tested by optical microscope to observe microstructure, brinell test and impact test respectively to measure hardness and impact strength properties. Martensite and bainite were microstructures that appeared after hardening processes. The holding time for 30 minutes gave higher hardness properties than the holding time for 60 minutes. However, the holding time for 60 minutes performed higher impact strength than that for 30 minutes. The highest of hardness was performed by the specimen cooled in water medium at 552 BHN and the highest of impact strength was performed by the specimen cooled in air medium at 7.2 J/mm2.]]>
<![CDATA[Analysis of Import Gate Out Service Using Control Chart in PT Terminal Petikemas Surabaya ]]>
<![CDATA[Rafly Septianarta Putra]]>;
<![CDATA[Iis Dewi Ratih]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 7, No 1 (2021) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v7i1.a7460
<![CDATA[Goods from abroad entering Indonesia must go through several stages of inspection. One of the final inspection stages of imported goods is through the import gate out of PT Terminal Petikemas Surabaya (PT TPS). Import Gate Out is the entry and exit access for each truck that will carry out activities in the area of PT TPS. The gate itself functions as a place to identify containers that will enter whether they are in accordance with the data and as a place of confirmation for the commanderer who will leave the port whether it has been completed and is in accordance with the existing procedures. In the import gate out process, there are operators in charge to ensure that the incoming or outgoing containers are in accordance with the existing system at PT TPS. In carrying out its duties, gate operators are expected to have the skills and speed to serve every container that will enter or leave PT TPS. To determine the extent of the performance duration of the gate operator PT TPS a research was conducted on the service time of the import gate out operator using descriptive analysis and control charts. This research was conducted using data collection techniques by observation. The results of this study indicate that the average transaction per day is 33.5 seconds.]]>
<![CDATA[The Factor Analysis That Has Significant Influence on The Timing of Implementation of Infrastructure Development LRT (Light Rail Transit) Projects in Jabodebek ]]>
<![CDATA[Faisal Fahmi]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 3, No 2 (2017) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v3i2.a2797
<![CDATA[Jakarta Bogor Depok Light Rail Transit or abbreviated as LRT Jabodebek is a Mass Transit system with light rail (LRT) which is planned to be built in Jakarta, Indonesia and connecting Jakarta with surrounding cities like Bekasi and Bogor. One of the most important problem in the construction of this Jabodebek LRT is the delay in implementation time. This study aims to determine the factors that have a significant influence on the timing of the implementation on Jabodebek LRT. This research used descriptive method. The instruments that used in data collection is through questionnaire technique (questionnaire). This research will discuss about the application of the TOPSIS method in classifying which factors are the most significant to the time of construction on Jabodebek LRT. The weighting critriea and the classification criteria using Topsis. The results of this study indicate that land handover aspect is the first rank to be considered as the main factor causing project delay with preference value 0.9. The second aspect is the preparation of a good work plan with a preference value of 0.82. The third aspect is the selection of improper construction methods with the preference value of 0.8 and the fourth aspect which is not less important to be considered is the funding aspect of the project activity with the preference value 0.79. The author recommends that the decision makers should consider these aspects so that project implementation time can be well controlled so that there is no delay to know which factor is the most significant with respect to time in the implementation time of the project Jabodebek LRT.]]>
<![CDATA[21 Bar Yoshimin Boiler Maintenance with Controlling Residual Phosphate ]]>
<![CDATA[Afan Hamzah]]>;
<![CDATA[Agung Subaykto]]>;
<![CDATA[Agus Surono]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 6, No 2 (2020) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v6i3.a8117
<![CDATA[Boiler as the steam generator is usually utilized as a turbine drive and other industrial processes. Boiler needs good treatment and surveillance to keep its best performance. Boiler water (BW) and boiler feed water (BFW) quality control is essential in boiler maintenance since it preserves boiler from crust, corrosion, and carry over, moreover, it also prevents boiler pipe to break. Boiler maintenance in sugar refinery factory is carried out by controlling the quality of BFW, Chemical injection (inner maintenance) and blowdown of boiler water. BFW mineral content (SiO2 , total hardness) is maintained as small as possible using a softener (cation resin) or demineralization unit (cation and anion resin). Chemical injection is performed by the addition of soda in order to control the pH of boiler water. Phosphate addition aims to tie up total hardness level which is caused by concentration process of water boiler and slipped of hard water from BFW. Blowdown process has purpose to reduce crust and corrosion caused by mineral concentrate inside boiler. The experiment was conducted by controlling pH of BFW from 7.5-8.5, maximum total hardness at 3 ppm, maximum SiO2 concentration at 3 ppm and maximum Total Dissolve Solid (TDS) at 100 ppm while BW was controlled its pH at 10.5-11, maximum total hardness at 20 ppm, maximum SiO2 concentration at 50 ppm, maximum Total Dissolve Solid (TDS) at 2000 ppm, and residual phosphate ion between 4 – 10 ppm. The experiment time was adjusted as a milled day or about for 140 days. The result of the experiment showed that the treatment had a good impact on the condition of the boiler drum pipe.]]>
