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
311 Documents
<![CDATA[Performance Changes in Mass and Compressive Strength of High-Calcium Fly Ash Based Geopolymer Concrete Due to Sodium Sulphate Exposure ]]>
<![CDATA[Yuyun Tajunnisa]]>;
<![CDATA[Nur Achmad Husin]]>;
<![CDATA[Andri Kusbiantoro]]>;
<![CDATA[Ahmad Daffa Azmi]]>;
<![CDATA[Khansa Fadilah Ashara]]>;
<![CDATA[Mitsuhiro Shigeishi]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 10 No. 1 (2024) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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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[Shallot Price Forecasting in Three Locations in Indonesia Using Generalized Space-Time Autoregressive Model ]]>
<![CDATA[Lidwina Galuh Wandira]]>;
<![CDATA[Mike Prastuti]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 10 No. 1 (2024) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j23378557.v10i1.a17592
<![CDATA[Shallots are one of the commodities that have an important role for the economy in Indonesia. Many shallot farmers, especially in production center areas, depend for their economy on shallot farming. The price of shallots in Indonesia during 2010-2022 fluctuated quite a bit. This is because the demand for shallots tends to increase over time, while shallot production is seasonal, and the distribution is uneven. The fluctuation of shallot prices and the huge costs of shallot farming result in risk and uncertainty for farmers. The forecasting method used is Generalized Space-Time Autoregressive (GSTAR). The results of the best model for predicting shallot prices in three locations in Indonesia, namely Cirebon, Tegal, and Madiun based on RMSE values, namely the GSTAR (31)-I(1) model use inverse distance normalization weights. Forecasting results for the highest shallot prices in Cirebon, Tegal and Madiun occur in the first week of August 2022. Meanwhile the lowest shallot prices in Cirebon and Madiun occur in the fifth week of August 2022, however the lowest shallot prices in Tegal occur in the fourth week of August 2022. Shallot price movement patterns in Cirebon, Tegal, and Madiun for the next 14 periods will continue to fluctuate but tends to show a downward trend. This was caused by several regions entering the harvest season, resulting in a spike in yields at the same time. As a result, the yield of shallots in the three locations was abundant and caused the price of shallots to decrease.]]>
<![CDATA[Effect of Variation of Adsorbent and pH Doses on Boron Adsorption Using DMAPAA-co-DMAPAAQ Hydrogel ]]>
<![CDATA[M Aldi Nugroho]]>;
<![CDATA[Alfian Rosyad Tsany]]>;
<![CDATA[Silma Elvaretta Aska]]>;
<![CDATA[Dimas Gilang Venanto]]>;
<![CDATA[Erlangga Ardiansyah]]>;
<![CDATA[Lulu Sekar Taji]]>;
<![CDATA[Eva Oktavia Ningrum]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 10 No. 1 (2024) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j23378557.v10i1.a19154
<![CDATA[Boron is very dangerous for living things. The boron concentration allowed for drinking water is less than 1 mg/L. If not standard, boron causes nausea, lethargy, diarrhea, vomiting, dermatitis, and a risk of miscarriage in pregnant women. Thus, this research investigated the effect of variations in adsorbent dosage and pH on boron adsorption using the DMAPAA-co-DMAPAAQ hydrogel. The research began with the hydrogel synthesis process, which continued with the batch-mode sorption study. Based on research results, the higher the adsorbent dosage, the more boron is adsorbed. The highest removal percentage with an adsorbent amount of 0.5 g/L was 19.89% for pH 3, and for an adsorbent dosage of 2 g/L was 19.52% for pH 9. The highest percent removal was at pH 11. The DMAPAA-co-DMAPAAQ hydrogel adsorbent is shown to be environmentally friendly compared to commercial resins because the commercial resins are not biodegradable, making them difficult to recycle, causing more damage to the environment.]]>
<![CDATA[Technical Study of Ship Plate Firing Process Time with Variation of Deformation Values ]]>
<![CDATA[Didik Hardianto]]>;
<![CDATA[Tri Agung Kristiyono]]>;
<![CDATA[Bagus Kusuma Aditya]]>;
<![CDATA[Sinung Widiyanto]]>;
<![CDATA[Safriudin Rifandi]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 10 No. 1 (2024) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j23378557.v10i1.a18594
<![CDATA[In the process of shipbuilding production and repair, deformation is sometimes encountered due to several factors, starting from load pressure, pulling, lifting, and welding processes. A fairing process is carried out to overcome the plate deformation, in which the plate is heated and cooled simultaneously. The method used in this research is direct time measurement during the fairing process on test plate specimens with variations in the depth of deformation curvature. The data obtained, processed, and analyzed to obtain an estimate of the fairing processing time the longer the fairing process takes, following the equation Y = 41.285X + 530.94, where X is the deformation angle, and Y is the estimation fairing processing time area per half square meter.]]>
<![CDATA[OBSAFER: Hydrogen Power Plant from Soybean Straw and Tofu Liquid Waste in Kediri District ]]>
<![CDATA[M Aldi Nugroho]]>;
<![CDATA[Yohanes Maruli Arga Septianus]]>;
<![CDATA[Miladia Faizin]]>;
<![CDATA[Muhammad Dimmas Firdaus]]>;
<![CDATA[Ahmad Rifaldi Rafi Afwa]]>;
<![CDATA[Amelia Bahetha]]>;
<![CDATA[Salsabila Aminatun Muthmainnah]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 10 No. 1 (2024) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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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[Implementation of Air Sweep to Prevent Blockages on The Salt Crystallization Process ]]>
<![CDATA[Heru Mirmanto]]>;
<![CDATA[Arino Anzip]]>;
<![CDATA[Dedy Zulhidayat]]>;
<![CDATA[Joko Sarsetiyanto]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 10 No. 1 (2024) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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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.]]>
<![CDATA[Design of an Integrated Temporary Storage for Hazardous and Toxic Material Wastes 4.0 Case Study in The Department of Industrial Chemical Engineering ]]>
<![CDATA[Farida Rahmawati]]>;
<![CDATA[Purwodarmianto]]>;
<![CDATA[Slamet Hariono]]>;
<![CDATA[Muhammad Dadang]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 10 No. 1 (2024) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j23378557.v10i1.a19252
<![CDATA[The Department of Industrial Chemical Engineering is one of the departments within the Faculty of Vocation at Institut Sepuluh Nopember Surabaya (ITS). It has four laboratories. The activities conducted in these laboratories, both in terms of practical work and research, generate hazardous and toxic waste that should be stored in a temporary waste storage facility. Temporary storage is crucial for safely containing hazardous and toxic Hazardous waste until it can be properly processed, disposed of, or transported to a permanent storage location. The primary goals of this facility are containment, separation, safety, and compliance with environmental regulations. The design and features of the facility play a crucial role in ensuring the effectiveness of temporary storage. Secondary containment structures, chemical compatibility measures, ventilation systems, safety protocols, and emergency response equipment are the primary components of this facility. These elements work together to prevent leaks, control chemical reactions, disperse hazardous vapours, maintain safety, and enable rapid emergency response. This research provides knowledge on the design of temporary storage facilities for hazardous and toxic materials, with technical specifications following regulations. Effective temporary storage management can protect human health and the environment and promote sustainable waste management practices.]]>
<![CDATA[Development and Analysis of an Innovative Precast Concrete U-Shell Beam ]]>
<![CDATA[Budi Suswanto]]>;
<![CDATA[Data Iranata]]>;
<![CDATA[I Gusti Putu Raka]]>;
<![CDATA[Yanisfa Septiarsilia]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 10 No. 1 (2024) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j23378557.v10i1.a20049
<![CDATA[Precast concrete offers several advantages compared to conventional systems; precast concrete structure technology has become a strategy to enhance standardization, quality control, labor efficiency, and reduce environmental impact and construction pollution. The U-Shell precast beam is a reinforced concrete beam with a 'U' shape designed to enhance practicality and expedite the construction process as it does not require additional formwork and shoring during implementation. The U-Shell beam functions as a permanent formwork, and its design follows either monolithic or conventional methods. In multi-story buildings, using U-Shell beam can increase practical value, reduce costs, and improve time efficiency because they do not require additional formwork and scaffolding in the implementation application. This research involves the development of U-Shell precast beams, structure loading considering various loads, modeling using computer program to determine the structural reactions on each element, reinforcement design for the U-Shell beam structure, and analysis of the lifting and assembly of U-Shell precast beam. The building selected for reviewing U-Shell beams is the Building with a Special Moment Resisting Frame System. From the results of the analysis, the researcher drew several conclusions regarding the reinforcement design for the U-Shell beam under both conditions. In the condition before composite, the number of installed main reinforcements is 6 with a diameter of 13 mm, while in the condition after composite, the number increases to 8 with a diameter of 16 mm. Lifting reinforcement requires a diameter of 10 mm. The difference in reinforcement between before composite and after composite conditions is because before the composite the beam is still receiving self-load, whereas for the after composite condition the change in moment occurs. After all, the beam has received self-load and other loads. The development and analysis of an innovative precast concrete U-Sheel beam has complied with strength and serviceability.]]>
<![CDATA[The Effect of Cabbage Waste Pretreatment on Lignocellulose Content for Bioethanol Production ]]>
<![CDATA[Luthfi Kurnia Dewi]]>;
<![CDATA[Sadiah Tulus Setyobudi]]>;
<![CDATA[Nurul Fajria Kurnianti]]>;
<![CDATA[Wa Ode Cakra Nirwana]]>;
<![CDATA[Rifa Rahma Andriana]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 10 No. 2 (2024) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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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[Dual Mode: Establishing a Line-of-Sight Communication and Object Detection using Infrared Sensor Module ]]>
<![CDATA[Abqori Aula]]>;
<![CDATA[Dedy Suryadi]]>;
<![CDATA[Jamhir Islami]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 10 No. 2 (2024) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j23378557.v10i2.a19555
<![CDATA[Miniature wheeled mobile robot is a very reliable and feasibly cheap material for robotic research. The cheap mobile robot can be repurposed for other task. This paper especially highlights the implementation of mobile robot for navigation. One of the purpose of navigation is to avoid collision. One of the most prevailing usage for object avoidance is infrared module. However, infrared signal can also be used for direct communication. In this paper, a dual mode function of infrared sensor module is presented. Using the same infrared module, communication and object detection are established. The proposed infrared module and switching algorithm are applied to a group of Arduino powered wheeled mobile robots. Preliminary lab-scaled tests show that the solution proposed in this paper perform well. Using an artificial experimental setup, the result shows that 19 out of 20 experiments (at 95% probability) were successful of detecting an object. The result also shows that 18 out of 20 simulations (at 90% probability) were able to successfully conduct a communication.]]>
