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
144 Documents
<![CDATA[Calculation and Design of Transmission System in the Design of Empty Palm Oil Fruit Bunches Chopper Machine with a Capacity of 100 Kg / Hour ]]>
<![CDATA[Dimitra Meidina Kusnadi]]>;
<![CDATA[Mashuri Mashuri]]>;
<![CDATA[Muhammad Dimasromanda Hidayatullah]]>;
<![CDATA[Muhammad Lukman Hakim]]>;
<![CDATA[Suhariyanto Suhariyanto]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 9, No 3 (2023) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v9i3.a18578
<![CDATA[The waste of empty palm fruit bunches (EFB) as compost material and as fiber material needs to go through a decomposition and chopping process to simplify the processing process. The empty palm fruit bunches (EFB) chopping machine has now been developed in various regions using various types of transmission, propulsion, and also various models. The design of chopping machines is also increasingly diverse in line with the increasing market demand for processed products from empty palm fruit bunches (EFB). Based on these conditions, an appropriate transmission system is needed to lighten the workload of the machine, increase production yields, and save production costs. From the results of the research, it was found that the empty palm fruit bunches chopping machine with a total capacity of 100 kg / hour was tested. The machine is driven by an electric motor with a power of 4 kW and a rotational speed of 1440 rpm, which is transmitted using a pulley and belt open drive transmission system. The power from the machine is transmitted to the cutting section to chop the empty palm fruit bunches well]]>
<![CDATA[The Effect of Cabbage Waste Pretreatment on Lignocellulose Content for Bioethanol Production ]]>
<![CDATA[Dewi, Luthfi Kurnia]]>;
<![CDATA[Setyobudi, Sadiah Tulus]]>;
<![CDATA[Kurnianti, Nurul Fajria]]>;
<![CDATA[Nirwana, Wa Ode Cakra]]>;
<![CDATA[Andriana, Rifa Rahma]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 10, No 2 (2024) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v10i2.a19270
<![CDATA[Cabbage waste represents a resource rich in lignocellulose, offering substantial potential as a raw material for bioethanol production. However, the nature of lignocellulosic complexes necessitates effective pretreatment strategies to enhance cellulose accessibility. This study aims to determine the effect of pretreatment on cabbage waste on changes in lignocellulosic content before and after pre-treatment to determine the influence of solution concentration and pretreatment duration of cabbage waste on the level of reducing sugars, which will subsequently affect bioethanol fermentation. In this research, cabbage waste was pretreated using H2SO4 1 M and alkaline NaOH 1 M for 1 hour to determine the pretreatment agent that produced the highest cellulose content. Furthermore, the concentration (1 M; 1.5 M; 2 M) and the pretreatment time (1 hour; 1.5 hours; 2 hours) will be varied to produce the highest reducing sugar content, which will be continued to the Simultaneous Saccharification and Fermentation (SSF). The results showed that pretreatment using H2SO4 produced the highest change in cellulose content. Pre-treatment using H2SO4 at a concentration of 1.5 M for 1.5 hours produced the highest reducing sugar concentration of 0.32 g/L. The highest bioethanol content was obtained during fermentation for 72 hours at 22.25%.]]>
<![CDATA[Numerical Procedure for Modeling Crack Closure Induced Plasticity ]]>
<![CDATA[Julendra Bambang Ariatedja]]>;
<![CDATA[Wajan Berata]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 9, No 3 (2023) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v9i3.a19560
<![CDATA[Numerical procedures are utilized to predict crack closure-induced plasticity on planar surfaces. Skinner's algorithm is presented as an APDL macro command set. Procedures for controlling element size are developed to ensure the continuity of element size gradation. A loading generator is constructed using the *dim parameter, and the Newman model is explored for comparison. The analysis, based on conducted research, yields results lower than 0.05Sy.]]>
<![CDATA[Analyzing the Performance of Reverse Osmosis Membranes After the Cleaning Process: Case study Performed at PT. XYZ. ]]>
<![CDATA[Afandy, Moh. Azhar]]>;
<![CDATA[Khatimah, Khusnul]]>;
<![CDATA[Sawali, Fikrah Dian Indrawati]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 10, No 2 (2024) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v10i2.a20537
<![CDATA[PT. XYZ uses a reverse osmosis (RO) system in demin water treatment. One of the weaknesses of the RO system is the formation of fouling on the membrane, which can reduce the performance of the membrane, so it is necessary to carry out an appropriate cleaning process to remove deposits on the surface of the membrane, restore the separation characteristics, and restore the normal capacity of the system. This research aims to examine the effect of cleaning on the performance of reverse osmosis membranes in the PT. XYZ with requirements for reverse osmosis membrane type FILMTEC BW30–400 IG. The research was conducted for 8 weeks by collecting data on the reverse osmosis control box and control room in the form of product flow rate, feed conductivity, and product conductivity. Based on the results of the study, it can be concluded that the effect of cleaning on membrane performance can only extend the life of the membrane and cannot meet the specifications for the working parameters of the reverse osmosis membrane, which can be seen in the salt rejection, salt passage, and flux values obtained in this study.]]>
<![CDATA[OBSAFER: Hydrogen Power Plant from Soybean Straw and Tofu Liquid Waste in Kediri District ]]>
<![CDATA[Nugroho, Aldi]]>;
<![CDATA[Septianus, Yohanes Maruli Arga]]>;
<![CDATA[Faizin, Miladia]]>;
<![CDATA[Firdaus, Muhammad Dimmas]]>;
<![CDATA[Rafi Afwa, Ahmad Rifaldi]]>;
<![CDATA[Bahetha, Amelia]]>;
<![CDATA[Muthmainnah, Salsabila Aminatun]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 10, No 1 (2024) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v10i1.a19179
<![CDATA[Industrial developments result in higher consumption of electrical energy with considerable emissions. Efforts to develop alternative energy are carried out to overcome climate change. Hydrogen, as a clean energy, can be produced from biomass, such as soybean straw waste. The OBSAFER innovation was created to optimize the use of soybean straw and tofu liquid waste in electrical power. The process began with soybean straw waste pre-treated with NaOH and entered into a bioreactor for a dark fermentation process with Clostridium butyricum to produce hydrogen, methane, and carbon dioxide. Then, the gas is separated by a CH4 filter and a CO2 filter, so the main product is hydrogen. The OBSAFER technology can produce 821,751 kWh/year from 21.6 tons of soybean straw waste and Clostridium butyricum from tofu liquid waste.]]>
<![CDATA[Smart Urban Farming Based on Internet of Things Using Soil Moisture Control and Application of Liquid Fertilizer to Mustard ]]>
<![CDATA[Mashuri Mashuri]]>;
<![CDATA[Muhammad Lukman Hakim]]>;
<![CDATA[Achmad Zubaidi]]>;
<![CDATA[Dika Andini Suryandari]]>;
<![CDATA[Dimitra Meidina Kusnadi]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 9, No 3 (2023) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v9i3.a18446
<![CDATA[Soil conditions significantly impact plant growth. Liquid fertilizer is used to optimize plant growth, and soil moisture is crucial too. Insufficient moisture causes withering, while excess leads to reduced soil oxygen. To monitor soil moisture, researchers developed an IoT-based Smart Urban Farming device using ESP32 microcontroller and 6 soil moisture sensors. The system operates through CNC Milling with X and Z axes movement. ADC pin on ESP32 reads sensor values, controlled and monitored by thinger.io. The device can work automatically or manually. Input and output testing ensures performance assessment. Soil moisture sensor testing yields 2091-3998 bits range, stepper motor testing shows 1.96% highest error, and water pump testing takes 0.05 seconds/milliliter. Mustard plants use a 60% set point for soil moisture, and the pump activates at 55%. The device shows good performance with an error range of 0.03% - 0.08%, demonstrating the effectiveness of the smart urban farming system.]]>
<![CDATA[Stress-Strain Behavior of Confined Class C Fly Ash-Based Geopolymer Concrete ]]>
<![CDATA[Ummah, Galih Syifa’ul]]>;
<![CDATA[Piscesa, Bambang]]>;
<![CDATA[Tajunnisa, Yuyun]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 10, No 2 (2024) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v10i2.a20757
<![CDATA[Fly ash-based geopolymer cement has recently attracted attention due to its application potential, as well as being an alternative binder with low emissions compared to conventional portland cement in concrete production. Studies intended on the mechanical properties and behaviors of structural elements produced from class C fly ash-based geopolymer concrete are important to improve the implementation. This study aimed to determine the effect of confinement on the behavior of class C fly ash-based geopolymer concrete and portland cement-based concrete. 6 specimens were made with class C fly ash-based geopolymer concrete tested under axial loading. Then, 6 specimens were made with ordinary portland cement-based concrete for comparison. The variable considered in this study is the pitch of confinement. The effect of the pitch of confinement on the enhancement strength and stress-strain of class C fly ash-based geopolymer concrete was obtained. The analytical model proposed by Richard et al. was selected to evaluate the ultimate compressive strength and ultimate compressive strain of confined geopolymer concrete in this study. The results showed that confinement reinforcement improved the strength and ductility of class C fly ash-based geopolymer concrete.]]>
<![CDATA[Performance Changes in Mass and Compressive Strength of High-Calcium Fly Ash Based Geopolymer Concrete Due to Sodium Sulphate Exposure ]]>
<![CDATA[Tajunnisa, Yuyun]]>;
<![CDATA[Husin, Nur Achmad]]>;
<![CDATA[Kusbiantoro, Andri]]>;
<![CDATA[Daffa Azmi, Ahmad]]>;
<![CDATA[Fadilah Ashara, Khansa]]>;
<![CDATA[Shigeishi, Mitsuhiro]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 10, No 1 (2024) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v10i1.a16232
<![CDATA[The sulfate environment is one of the conditions that significantly affect the durability of concrete. Sulfate attack causes cracks and affects the quality of the concrete. Therefore, it is necessary to innovate concrete that can withstand the aggression of this sulfate attack. Geopolymer concrete is a breakthrough that can be developed as an alternative material without using Portland cement as the ingredients, yet by using class F fly ash as the primary source material. On the other hand, the availability of class C fly ash with high CaO content is highly abundant in Indonesia. The high calcium content in this fly ash will cause the fresh geopolymer concrete to harden rapidly. Previous studies used sucrose as an additive to overcome this rapid hardening problem. However, its effect on the geopolymer concrete exposed to sulfate ingression requires further investigation. In this study, the geopolymer concrete was produced by using class C fly ash and sucrose. The sulfate ingression was simulated by immersing the concrete specimen in the sodium sulfate solution while the mass changes and compressive strength were examined. pH measurement of the sodium sulfate solution was also carried out to provide a different perspective on the data analysis. Cylindrical specimens, measuring 10 cm x 20 cm, were produced using the dry-mixing method and the characteristic strength of 28 MPa according to SNI 2847–2019. From the results, geopolymer concrete with sucrose showed a high workability performance through the high slump value obtained. Nevertheless, the experimental results also indicated the declining strength of geopolymer concrete after the sulfate exposure. However, only a slight reduction was observed. The strength residue still satisfies the minimum requirement of SNI 2847-2019. It shows the potential of geopolymer concrete to be used as a construction material in a harsh environment with high sulfate content.]]>
<![CDATA[Physicochemical Properties of Crude and Purified of Glucomannan Flours ]]>
<![CDATA[Heksa, Ayu Cahyarani]]>;
<![CDATA[Rahmawati, Yeni]]>;
<![CDATA[Nurkhamidah, Siti]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 10, No 2 (2024) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v10i2.a20625
<![CDATA[Konjac glucomannan (KGM) is a versatile polysaccharide extracted from Amorphophallus species tubers. Commonly, extracted crude porang flour still has some impurities which limits the application of utilizing the material. High purity of processed glucomannan flour could satisfy the demand of growing awareness of healthy diet and industrial scale production. In this study, the physicochemical properties of purified glucomannan flour compared with crude porang flour were investigated. Thermal stability of the purified flour was increased indicated by higher degradation temperature, which was revealed by Thermogravimetric Analysis (TGA). The structural characteristics were investigated by FTIR and X-ray Diffraction (XRD) analysis. In addition, Scanning Electron Microscopy (SEM) was conducted to study the morphology and grain size of crude and purified flours. The results revealed that purified glucomannan flour has better thermal stability, higher crystallinity, smaller granule size and significantly higher viscosity compared to crude flour.]]>
<![CDATA[Implementation of Air Sweep to Prevent Blockages on The Salt Crystallization Process ]]>
<![CDATA[Mirmanto, Heru]]>;
<![CDATA[Anzip, Arino]]>;
<![CDATA[Zulhidayat, Dedy]]>;
<![CDATA[Sarsetiyanto, Joko]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 10, No 1 (2024) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v10i1.a19197
<![CDATA[In the process of crystallization salt, blockages often occur due to the large amount of salt that sticks to the wall’s hopper of the crusher machine. Seeing this condition, a Salt Cleaning Tool was designed using the air sweep method. In the first step of the design, a survey was carried out to find out how thick and the area of salt that sticks over a certain period. Furthermore, experiments were carried out to determine the position of the nozzle and the air pressure needed to knock out the salt attached to the hopper. The control system uses Arduino hardware as a micro controller tool. The experimental results require that the spray direction is tangential to the hopper surface, so the nozzle on the market needs to be modified. Likewise, an air pressure of 6 bar .is required and a burst time period of every 3 seconds with a nozzle opening time of 250 milliseconds with the condition that three solenoids are open together. Modification of the nozzle The control system uses Arduino hardware as a micro controller tool. The implementation of the air sweep as a salt cleaning tool has been successful, this is evidenced by operation of the crusher machine without problems]]>
