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Specta Journal of Technology
Published by Institut Teknologi Kalimantan
ISSN : 25492713     EISSN : 26229099     DOI : https://doi.org/10.0610/specta.v2i3
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Environmental Science
SPECTA journal is published by Lembaga Penelitian dan Pengabdian kepada Masyarakat, Institut Teknologi Kalimantan, Balikpapann Indonesia. SPECTA is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in the field of Physics, Mathematics, Mechanical Engineering, Electrical Engineering, Chemical Engineering, Materials and Metallurgy, Civil Engineering, Industrial Engineering, Naval Engineering, Urban Planning, Informatics, Information System, Environmental Engineering, and Ocean Engineering. SPECTA accepts submission from all over the world, especially from Indonesia.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 10 Documents
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Search results for , issue "Vol. 9 No. 3 (2025): Specta Journal of Technology" : 10 Documents clear
Pengaruh Proses Solution Treatment dan Shot Peening Terhadap Kekuatan Mekanik dan Struktur Mikro Baja Mangan Austenitik Untuk Komponen Frognose Rel Wahyu, Wahyu Tian; Ramdan, Raden Dadan
SPECTA Journal of Technology Vol. 9 No. 3 (2025): Specta Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v9i3.952

Abstract

Wessel is a part of the railway track which functions as track switching. One of the components of Wessel, which is made through the casting process is called frognose. Frognose is the most critical component in the Wessel crossing, as it must withstand the impact load caused by the movement of train wheels. The production of frognose follows the EN 15689 standard and the Minister of Transportation Regulation of the Republic of Indonesia No. 60 of 2012. Austenitic manganese steel ASTM A 128 Grade C is chosen as the main material. This austenitic manganese steel has high-strain hardening properties when subjected to static, dynamic, and impact loads on its surface. In this study, a heat treatment process is used to improve the mechanical properties and carbide solubility of the casting results. Cooling the object from the casting process causes carbide growth which is caused by the cooling rate. Therefore, solution treatment is necessary to dissolve the carbides. The solution treatment process is carried out at various temperatures 1075ºC, 1150ºC, and 1225ºC. Subsequently, the optimized material from the solution treatment is subjected to shot peening deformation. Based on the research results, the solution treatment process at 1150ºC temperature shows the best toughness, thus it will be continued with the shot peening deformation process. The deformation caused by the shot peening process is able to change the crystal orientation by forming twinning, thereby increasing the material hardness value. The best mechanical properties are obtained in sample ST2 followed by the SP12 process with a combination of hardness value of 35 HRC at a depth of 0.05mm; impact energy of 82,92 joule/cm2 and mostly carbide-free microstructure.
Perancangan dan Penilaian Kinerja Kompor Berbahan Bakar Minyak Jelantah Berbasis Teknologi FFEAS Metode French Setiawan, Rizal Justian; Ma'ruf, Khakam; Darmono; Khosyiati, Nur Evirda; Azizah, Nur
SPECTA Journal of Technology Vol. 9 No. 3 (2025): Specta Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v9i3.1072

Abstract

Waste cooking oil or used cooking oil is potentially carcinogenic waste and dangerous to human health if used for cooking repeatedly. If waste cooking oil is disposed of in the environment, it can harm soil structure by impeding water movement in soil pores. Therefore, the development of waste cooking oil stove technology designed using the French method can be a solution to utilize waste cooking oil as an alternative fuel. The results of this research are a stove design and device that can use used cooking oil. This stove uses abundant waste cooking oil with efficient and clean combustion results through the use of FFEAS Technology. This stove uses a floating wick and an excess air system which makes the combustion process easier. The performance of the stove being developed can be seen in several tests such as ignition combustion duration, required pressure, operational time, fuel consumption rate, sensible heat, and latent heat. The results of three tests that have been conducted show that the average ignition duration of the stove is 12 minutes, the optimal pressure is 4-5 bar, the fuel consumption rate is 8.34ml/minute, the average latent heat is 1,095.82 watts, and the average sensible heat is 132.48 watts.
Pemodelan Matematika dan Kendali Optimal Penyebaran Penyakit Malaria di Kabupaten Panajam Paser Utara Ahmad Maulana Syafi'i; Sari, Yosinta
SPECTA Journal of Technology Vol. 9 No. 3 (2025): Specta Journal of Technology
Publisher : LPPM ITK

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Abstract

In this paper, the dynamics of malaria transmission model in Panajam Paser Utara Regency are given. The SISI (Susceptible Human-Infected Human-Susceptible Vector-Infected Vector) model is used in this paper by assuming that the human population can be infected with malaria more than once. The model parameters are estimated based on monthly cumulative data of malaria cases in Panajam Paser Utara Regency in 2023-2024 using the Kalman Filter method. The simulation results show that the comparison of the estimated value and the actual value in cases of humans infected with malaria in Panajam Paser Utara Regency in 2023-2024 produces a MAPE of 6.27% so that it can be concluded that the level of forecasting accuracy is high because it is <10%. Furthermore, two controls are considered to minimize the spread of malaria, namely human contact prevention measures with mosquitoes and mosquito spraying. Then the dynamic optimization problem is solved using the Pontryagin Minimum Principle method. The goal is to reduce the population of infected humans and mosquitoes by minimizing the costs incurred for mosquito prevention and spraying. Numerical results are presented to show that both controls can effectively minimize the spread of malaria.
Analisis Kelayakan Investasi pada Studi Kasus Perusahaan Properti Ciputra Group Menggunakan Metode Cost Benefit Analysis Shauma Salsabiilla, Risqi’a; Oktar, Adnan; Rahmawati, Febri; Alif. S, Muh Ikhsan
SPECTA Journal of Technology Vol. 9 No. 3 (2025): Specta Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v9i3.8481355

Abstract

The purpose of this study is to analyze the investment feasibility of Ciputra Group real estate projects using Cost-Benefit Analysis (CBA). Secondary data in the form of financial statements of Ciputra Development Tbk from 2005-2023 were used with the analysis tools of Net Present Value (NPV), Internal Rate of Return (IRR), and Benefit Cost Ratio (BCR). The project is assumed to have a four-year investment period (2020-2023). The analysis results show that the project is worth investing with a positive NPV of IDR5.37 trillion, an IRR of 3.4512% which is higher than the discount rate of 3%, and a BCR of 1.22. In addition, a sensitivity analysis was conducted to measure how changes in assumptions affect the results. The findings recommend investing in Ciputra Group's real estate projects as they have the potential to provide significant economic benefits to the company.
IMPLEMENTASI MANAJEMEN RISIKO PERUSAHAAN STUDI KASUS START UP CIRO WASTE Reza Fahlevi, Mohammad; Deny Arthawan Sugih Prabowo, I Putu; Shauma Salsabiilla, Risqi’a; Amanda Aulia Putri, Ghea; Alyaa Farraas, Ghina; Nurhadi Efendi, Muhammad
SPECTA Journal of Technology Vol. 9 No. 3 (2025): Specta Journal of Technology
Publisher : LPPM ITK

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Abstract

Sustainability-oriented waste management startups such as Ciro waste require comprehensive risk analysis to ensure operational stability and support long-term business growth. Despite operating in a highly regulated and complex sector—facing challenges such as strict environmental policies, raw material price volatility, and operational hazards including workplace accidents and ecological impacts—Ciro waste has yet to establish a documented risk management framework. This study aims to identify, evaluate, and design risk mitigation strategies aligned with the startup's business model. The methodology involves qualitative analysis of core business processes and risk mapping based on the ISO 31000 framework. The findings indicate that implementing a structured risk management approach not only minimizes potential operational disruptions but also enhances business resilience and strengthens the company’s reputation as a responsible and sustainable enterprise. These insights serve as a foundation for recommending the integration of risk management practices into Ciro waste’s overall business strategy, thereby fostering innovation in a competitive and sustainability-driven waste management industry.
Analisis Emisi Gas Rumah Kaca Pada Pengelolaan Sampah di Institut Teknologi Kalimantan Menggunakan Metodologi Intergovernmental Panel on Climate Change: Analisis Emisi Gas Rumah Kaca Pada Pengelolaan Sampah di Institut Teknologi Kalimantan Bunga', Samuel; Rahendaputri, Chandra Suryani; Yorika, Rahmi; Rini, Intan Dwi Wahyu Setyo; Maulana, Melisa Triandini
SPECTA Journal of Technology Vol. 9 No. 3 (2025): Specta Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v9i3.8481427

Abstract

Institut Teknologi Kalimantan uses a solid waste disposal system for waste management. Waste is being delivered straight to the dump (TPA) without any kind of processing or recycling. The goal of this research is to analyze greenhouse gas emissions generated from the current waste management practices at Institut Teknologi Kalimantan, as well as to evaluate emissions under Three alternative scenarios. The research method complies with IPCC 2019. Scenario 1 integrated landfilling with organic waste composting and a high recycling rate (RF: 80%). Scenario 2 involved waste incineration, organic waste composting, and a moderate recycling rate (RF: 50%). Finally, Scenario 3 focused on waste incineration combined with organic waste composting. The research findings indicate that paper waste is the largest contributor to greenhouse gas emissions in Scenario 0, accounting for 52% of the total emissions produced. Among the three scenarios analyzed, Scenario 3 generated the highest overall greenhouse gas emissions. In this scenario, waste incineration emerged as the predominant source, contributing 93% of the total emissions in Scenario 3. The types of waste contributing to greenhouse gas emissions in solid waste disposal under Scenario 0 are organic waste (food scraps), paper waste, and wood waste. Among these, paper waste produces the highest greenhouse gas emissions due to its high Degradable Organic Carbon (DOC) content. Based on the three scenarios, and assuming without considering economic aspects or control measures, waste incineration was found to produce the highest emissions compared to landfill disposal and composting.
Optimasi Rute Distribusi pada Heterogeneous Capacitated Vehicle Routing Problem (HCVRP) Menggunakan Algoritma Evolutionary (Studi Kasus: CV. XYZ) Willis, Tito Bisma May; Pasaribu, Melly Rosinta; Sandra, Al Dian Devina; Miftah, Tarizza Alya Nurul
SPECTA Journal of Technology Vol. 9 No. 3 (2025): Specta Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v9i3.8481430

Abstract

CV. XYZ is a company engaged in the field of goods delivery services that must distribute to various customer points every day. With the number of vehicles and delivery routes that continue to grow, the company faces challenges in managing efficient routes. If delivery is carried out without optimal route planning, there can be wasted mileage, increased fuel costs, and delays in delivery that can reduce customer satisfaction. This study tries to provide a solution with a combination approach between the Capacitated Vehicle Routing Problem (CVRP) and Heterogeneous Vehicle Routing Problem (HVRP) methods using the Evolutionary Algorithm feature in Microsoft Excel. The main problem to be answered in this study is how to determine the most optimal route and how much distance savings are obtained from the optimization results. The steps in the study start from initial observation, collecting customer and vehicle data, creating a route model, processing data with Excel, to analyzing the results. From the optimization results, the total initial mileage before optimization was 318.7 km, which was then successfully reduced to 300.44 km after processing with Solver, resulting in a difference savings of 18.26 km. These findings indicate that a mathematical method approach in delivery route planning can have a significant impact on the company's distribution efficiency and operational costs.
Inovasi Pengolahan Limbah Baglog Jamur Tiram Menjadi Kompos Dengan Mol Nasi Basi Sebagai Bioaktivator Febrianti, Nia; Basransyah; Safitri, Nuri Dwi
SPECTA Journal of Technology Vol. 9 No. 3 (2025): Specta Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v9i3.8481444

Abstract

Oyster Mushroom Cultivation at KM 15, Balikpapan City produces up to 4,000 kg of baglog waste within a 3-month period. The baglog waste, which serves as the growing medium for oyster mushrooms, is merely stacked and discarded into the surrounding forest without proper treatment. Accumulation of baglog waste can cause environmental pollution as it becomes a breeding ground for wild fungi. Composting offers a potential solution for managing baglog waste. The composting process requires the addition of an activator to accelerate decomposition, such as fermented rice-based Local Microorganisms (MOL), which contain Lactobacillus sp. and Saccharomyces sp. Rice-based MOL is rich in carbohydrates, which serve as nutrients for microorganisms. This study aims to analyze the quality of compost produced from oyster mushroom baglog waste using rice-based MOL as a bioactivator, as well as to determine the effect and optimal volume of MOL on compost quality. The composting process was carried out using the aerobic Takakura method at a laboratory scale over a 30-day period. The variations of rice-based MOL used were 0 mL, 100 mL, and 250 mL. The quality of the resulting compost was compared against the Indonesian National Standard (SNI) 19-7030-2004. The results of the study showed that the control treatment, as well as the addition of 100 mL and 250 mL of MOL, met the compost quality standards for temperature, pH, odor, color, texture, moisture content, nitrogen, phosphorus, organic carbon, and C/N ratio. However, the potassium parameter did not meet the standard. Based on the graph, the addition of rice-based MOL indicates a positive effect on compost quality improvement. The optimum MOL volume for all parameters was 250 mL, although the potassium parameter still did not meet the SNI 19-7030-2004.
Aplikasi Campuran Ekstrak Kulit Nanas dan Biji Pepaya sebagai Biokoagulan untuk Penurunan Fe, Mn, dan Kekeruhan pada Air Asam Tambang dengan Metode Jar Test Ismi Khairunnissa Ariani; Rina Noor Hayati; Riza Hudayarizka; Cut Keumala Banaget; Krisma Nabilla
SPECTA Journal of Technology Vol. 9 No. 3 (2025): Specta Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v9i3.8481486

Abstract

Acid mine drainage can pollute the environment if not treated properly. Acid mine drainage can be treated using the coagulation-flocculation jar test method with pineapple peel and papaya seed biocoagulants to reduce the contaminants contained therein. The purpose of this study was to determine the characteristics of acid mine drainage, analyze the effect of biocoagulant dosage and analyze the variation of slow stirring time in reducing Fe, Mn, Turbidity parameters in Acid Mine Drainage. The research variables used were biocoagulant dosage of 0.5 - 2.5 gr/500 mL and slow mixing time of 10 - 30 minutes. Based on the characteristic test, acid mine drainage has content that exceeds the quality standard. The optimum biocoagulant dose was 0.5 gr/500 mL with Fe parameter removal efficiency of 66.56% with a concentration of 18.3 mg/L, Mn of 8.71% with a concentration of 12.78 mg/L, and Turbidity of 78.87% with a concentration of 5.33 NTU. The optimum stirring time is 10 minutes with Fe removal efficiency of 61.71%, Mn of 71.18%, and Turbidity of 63.12%.
Optimalisasi Pengolahan Air Limbah Laundry Menggunakan Media Zeolit dan Karbon Aktif dalam Filter Kombinasi Dua Tabung Kompak: Optimalisasi Pengolahan Air Limbah Laundry menggunakan Media Zeolit dan Karbon Aktif dalam Filter Kombinasi Dua Tabung Kompak Muhammad Bagas Grahandikha, Muhammad Bagas; Pradiko, Hary; Rochaeni, Anni
SPECTA Journal of Technology Vol. 9 No. 3 (2025): Specta Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v9i3.8481751

Abstract

Laundry wastewater is a source of environmental pollution that requires attention because it contains various compounds such as surfactants, suspended solids, and organic compounds that have the potential to damage the quality of groundwater and surface water. This study aims to optimize laundry wastewater treatment in a compact two-tube combination filter containing zeolite and activated carbon media. The filter treats artificial laundry wastewater made with three concentration variations. The variations tested were the flow rate and wastewater concentration. The results showed that the best removal efficiency occurred when the zeolite media was positioned in the inner tube with a downward flow direction, then flowed to the activated carbon media in the outer tube with a downward flow direction as well. The best removal efficiency was achieved at a medium flow rate (0.06 L/s and an initial concentration of COD of 143 mg/L, surfactant of 27.5 mg/L, and TSS of 117 mg/L) with a COD removal efficiency of 67%, surfactant of 64%, and TSS of 91%. Several parameters have met the quality standards stipulated in Yogyakarta Special Region Regulation No. 7 of 2016 concerning Wastewater Quality Standards. Therefore, a combination filter with two compact tubes using zeolite and activated carbon media could be a solution to improve environmental quality..

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