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INDONESIA
TEKNIK
Published by Universitas Diponegoro
ISSN : 08521697     EISSN : 24609919     DOI : -
Core Subject : Engineering,
Engineering
Journal yang mempublikasikan artikel-artikel ilmiah dari berbagai disiplin ilmu rekayasa/keteknikan. Artikel-artikel yang dipublikasikan di Jurnal TEKNIK meliputi hasil-hasil penelitian ilmiah asli (prioritas utama), artikel ulasan ilmiah yang bersifat baru (tidak prioritas), atau komentar atau kritik terhadap tulisan ilmiah yang dipublikasikan oleh Jurnal TEKNIK.
Arjuna Subject : -
Articles 522 Documents
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Analysis of Changes in Sedimentation Volume of Kuwil Kawangkoan Reservoir with USLE Method and Area Reduction Method Widyatama, Radya Gading; Suharyanto, Suharyanto
TEKNIK Vol 46, No 2 (2025) April 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i2.65307

Abstract

Sediment deposited in the reservoir will increase in line with the total erosion rate. This causes the dead storage capacity of the reservoir to siltation, so studies need to be performed to estimate the amount of erosion rate and sediment distribution during the reservoir's operational period. The study location is at the Kuwil Kawangkoan Reservoir, North Minahasa Regency, North Sulawesi Province. The study aims to determine the reservoir erosion rate using the USLE Method based on Geographic Information Systems (GIS) and to analyze changes in the reservoir sedimentation storage volume using the Area Reduction Method. Based on the analysis, the volume of sediment deposited in the Kuwil Kawangkoan Reservoir catchment area is 307,382.08 m3/tahun. Over a 50-year lifespan, the predicted total volume of settled sediment is 15.369 million m3. The results of the sediment distribution analysis indicate that after 50 years, only 17.82% of the dead storage capacity will remain. Initially, the dead storage capacity of the reservoir was 7.63 million m³, but it is projected to decrease to 1.36 million m³ at an elevation of +77.00 m, below the intake elevation. Since the intake elevation of the Kuwil Kawangkoan Reservoir is at +83.50 m, the operation of Kuwil Kawangkoan Reservoir to fulfil water demand downstream is relatively unaffected.
The Impact of Sepaku Semoi Dam Construction on the Reduction of Tengin River Discharge Using the HEC-HMS Model Simbolon, Bernas; Suripin, Suripin; Suharyanto, Suharyanto
TEKNIK Vol 46, No 2 (2025) April 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i2.67796

Abstract

Floods are one of the most frequent hydrometeorological disasters in Indonesia, particularly in river basin areas. One of the river basins frequently experiencing floods is the Sepaku Watershed (DAS Sepaku). In recent years, the intensity and frequency of flooding in this area have increased. To mitigate future occurrences, flood routing (reservoir routing) calculations are necessary. One of the measures to reduce flooding is the construction of a dam. In response, the Central Government, through the Ministry of Public Works and Housing, has undertaken the development of Sepaku Semoi Dam in Penajam Paser Utara Regency, as part of efforts to optimize water resource potential within the territorial area of the future capital city (IKN). The Sepaku Semoi Dam is projected to supply raw water at a rate of approximately 2,500 liters per second, mitigate flooding, and support tourism. This study aims to analyze flood discharge at the Sepaku Semoi Dam using the HEC-HMS model with the reservoir routing method. The modeling seeks to rapidly estimate flood discharge and assess how changes in storage capacity influence peak discharge conditions, as well as to analyze the impact of dam construction. The flood routing analysis results indicate that the flood reduction for Q1000-year return period is 74.34%, while the outflow discharge for Q50-year return period is 105.7 m³/s, which is lower than the capacity of the Tengin River downstream of the Sepaku Semoi Dam.
Economic and Performance Analysis of Bioethanol Production from Aren and Palm Biomass Using Ionic Liquid with SuperPro Designer as a Transportation Energy Transition Strategy Maulidin, Ihsan; Utami, Amaliyah Rohsari I.; Sugiwati, Sri
TEKNIK Vol 46, No 1 (2025) January 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i1.67678

Abstract

This Increasing energy consumption has caused energy availability to become increasingly scarce, especially in Indonesia. Therefore, developing renewable energy sources, such as biofuels, is becoming increasingly important to support the energy transition in the transportation sector. One type of biofuel that is promising is bioethanol, which can be produced from biomass such as sugar palm and palm oil. However, the development of bioethanol still faces obstacles in terms of effectiveness, time, and production costs. Performance and economic analysis of bioethanol production from sugar palm and oil palm biomass with ionic liquid (IL) has been carried out using SuperPro Designer (SPD) software. This process begins with testing biomass characteristics to determine the most optimal sugar palm composition. Simulations with experimental conditions show that the optimal IL and biomass ratios are 1 g/g, resulting in ethanol concentrations of 92 g/L and 94 g/L, respectively, close to the theoretical results with 96% conversion of biomass to ethanol. Ethanol production on a factory scale shows cost reductions of up to 30% from initial prices. With the abundant availability of biomass, bioethanol production from sugar palm and palm oil has great potential to be developed in Indonesia, supporting the energy transition strategy in the transportation sector and reducing dependence on fossil fuels.
Cross Operator Charging Station Access Simulator Priyasta, Dwidharma; Hadiyanto, Hadiyanto; Septiawan, Reza; Cesar, Wahyu
TEKNIK Vol 46, No 1 (2025) January 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i1.67465

Abstract

The use of battery-based electric vehicles (KLBB) continues to increase, so the ease of using the Public Electric Vehicle Charging Station (SPKLU) infrastructure for recharging electric vehicle batteries must be considered to increase public confidence. One of the problems in using electric vehicles is the concern about long-distance travel (range anxiety) due to limited battery capacity and the minimal number of SPKLUs. This research aims to provide a tool to simulate cross-operator charging stations using the EV roaming method. In this approach, charging station users only need to be registered with one SPKLU operator to use other charging stations. This research develops a set of simulation models called the EV Roaming Simulator and simulates several EV roaming scenarios concerning the basic functionality of four state-of-the-art EV roaming protocols. The simulator consists of three Open Charge Point Protocol (OCPP)-based models: the Charge Point Model, the Central System Model, and the National Access Point Model, representing charging stations, central systems, and roaming hubs. The simulator is capable of executing the given EV roaming scenario. It has the potential to be further developed and used in developing various newly proposed EV roaming systems.
Vertical Deformation of Manikin Asphalt Concrete Core Dam Using Mohr-Coulomb and Hardening Soil Material Models with Plaxis 2D Software Gewangga, Arya Bakti; Sadono, Kresno Wikan
TEKNIK Vol 46, No 2 (2025) April 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i2.67680

Abstract

Optimization of Dredging Location Determination in Sutami Reservoir Using the Cut and Fill Method Pambudi, Tri; Nugroho, Hari; Suripin, Suripin
TEKNIK Vol 46, No 2 (2025) April 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i2.67919

Abstract

The Sutami Dam is located on the Brantas River, precisely in Karangkates Village, Sumberpucung District, Malang Regency. The Sutami Dam has been in operation for fifty-one years. Based on observations in the field, the rate of sedimentation entering the Sutami Reservoir is quite high, resulting in shallowing in the reservoir storage area up to the intake gate, which can affect the performance and productive life of the reservoir. This research is conducted to evaluate the planning of mapping dredging locations, the potential sediment that can be dredged, and the increase in the volume capacity of the dredging equipment. This research uses data from bathymetry, which is then analyzed for sedimentation and scour values compared between 2019 and 2022. For soil parameter data, laboratory test results such as grain size analysis and hydrometer analysis are utilized. Data analysis using the cut-fill method in ArcMap 10.8.2 software. The results of this research show that in carrying out dredging activities in the reservoir area, it is necessary to divide the dredging location into two zones with two types of dredgers that have different specifications. To increase the dredging volume capacity in the Sutami Reservoir using the scenario of using two existing dredgers and the addition of two new dredgers, an increase in the dredging capacity in the Sutami Reservoir of 1,702,189.00 m³ per year was obtained.
The Role of Algae in Biofuel Production: Potentials and Challenges for Sustainable Transportation Sari, Dessy Agustina; Djaeni, Moh.; Hadiyanto, Hadiyanto; Prasetyaningrum, Aji
TEKNIK Vol 46, No 1 (2025) January 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i1.67532

Abstract

This study aims to explore the potential of algae for sustainable biofuel production by examining their molecular biology and the use of advanced cultivation techniques. As concerns over greenhouse gas emissions and rising transportation energy costs grow, algae offer a promising alternative for fuel derived from both food and non-food sources. This review looks at the main biological pathways involved in making biofuels from algae. It focuses on species diversity, lipid content, and new technologies like photobioreactors and magnetic nanoparticle harvesting. The results showcase noteworthy advancements in biotechnology and genetic engineering that boost algae productivity and fuel yield, while also critically examining the environmental impacts such as CO2 emissions and water use, as well as the economic and policy challenges through a life cycle analysis. Adopting a global perspective, this review emphasizes the role of international collaboration and technology transfer in overcoming barriers. Conclusion: Algae-based biofuels hold considerable potential for reducing CO2 and supporting sustainable transportation, yet scaling up production and lowering costs remain challenges. Future research should focus on improving integrated biorefinery platforms, exploring CO2 capture, and promoting international partnerships.
Use of Hydrotreated Vegetable Oil from Palm Oil Sludge by Catalytic Hydrogenation Method as a Solution to Reduce Greenhouse Gas Emission Alfarizi, Fariz; Mubarok, Haris; Arinanda, Ida Bagus Made Krishna
TEKNIK Vol 46, No 1 (2025) January 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i1.67568

Abstract

Indonesia sebagai produsen minyak sawit terbesar di dunia memiliki potensi besar dalam memanfaatkan lumpur sawit (SPO) untuk menghasilkan Hydrotreated Vegetable Oil (HVO). Penelitian ini mengeksplorasi peran HVO dari SPO sebagai solusi strategis dalam transisi energi yang adil, khususnya untuk sektor transportasi. Melalui proses hidrogenasi katalitik, HVO menawarkan pengurangan emisi Gas Rumah Kaca (GRK) hingga 80% dibandingkan bahan bakar fosil, sekaligus mendukung target energi terbarukan nasional. Inovasi ini tidak hanya mengurangi ketergantungan Indonesia terhadap impor bahan bakar fosil tetapi juga mendukung prinsip ekonomi sirkular. Pengembangan teknologi dan kebijakan yang tepat sangat dibutuhkan untuk memastikan keberlanjutan dan skala produksi HVO dari SPO.
Coal Mine Slope Stability Analysis Using the Rock Mass Rating (RMR), Slope Mass Rating (SMR) Method, and Morgenstren-Price Limit Equilibrium for the Low Wall Pit Area Y PT. Bina Sarana Sukses, Lahat Regency, South Sumatra Najib, Najib; Belia, Nanda Putri; Hidayatillah, Ahmad Syauqi; Nugroho, Kevin Setyo Adi
TEKNIK Vol 45, No 2 (2024): August 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i2.57786

Abstract

Open pit mining has a complex connection to excavation and stockpiling operations, which can potentially induce slope instability. The analysis of slope stability is crucial to prevent slope failure, which has the potential to result in major losses. The study on slope stability was performed at the low wall pit Y area of PT. Bina Sarana Sukses site MAS in Lahat Regency. This research aimed to analyze the rock mass classifications, determine the safety factor values, and provide recommendations for mitigating landslide occurrences. The techniques employed in this study include the RMR and SMR methods for assessing the susceptibility of landslides, collectively with the Morgenstern-price limit equilibrium approach for estimating the stability of the slope. Based on the analysis of the rock mass rating (RMR) and slope mass rating (SMR), Block B2 exhibits a 20% likelihood of experiencing landslides, specifically due to block joint characteristics. On the other hand, Blocks B4 and B5 show a 40% potential for landslides, primarily associated with flat or wedge-type block joints. The force produced by friction under saturated conditions is comparatively lower than that observed under dry conditions. During the final design phase in 2022, it was observed that Blocks B4 and B5 exhibit critical and dangerous safety factors when saturated. Hence, the proposal has been suggested to enhance slope stability. Further, it is recommended to monitor the geotechnical piles periodically. We hope this research results as a valuable resource for evaluating and assessing slope stability, including artificial and natural slopes.
Improving Solvolysis Rate Via Under Glass-Transition Temperatures Quenching Followed by Roll Bending of Carbon Fiber Reinforced Polymer Composite Sukanto, Heru; Kusharjanta, Bambang; Kaavessina, Mujtahid
TEKNIK Vol 45, No 3 (2024): December 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i3.59296

Abstract

Reusing carbon fiber once it has been used as reinforcement in composite structures involves a complex recycling technique. This recycling process requires a strategy to ensure the recycled carbon fiber meets technical standards. Among various recycling processes, the solvolysis technique yields carbon fiber with high purity. However, solvolysis is also the most time-consuming method. This study proposes using quenching and roll-bending pretreatments, which increase the contact surface area between the composite and the solvent solution for expediting the solvolysis process of carbon fiber reinforced polymer (CFRP) composite. Quenching was performed by heating the composite to 75°C, 100°C, and 125°C before immersing it in water at room temperature. Roll bending was designed based on the principle of three-point bending and aimed to induce a strain in the composite that exceeds the strain of the epoxy resin. Quenching at 75°C, followed by roll bending, resulted in a 21% increase in the surface area of the composite. This increased area improved the solvolysis efficiency of CFRP composites by up to 21% after four days of immersion in a mixture of acetone and acetic acid.

Page 49 of 53 | Total Record : 522

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