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31	Agriculture	ABS-199
Isolation and Identification of Fungal Pathogens from Coated Red Chili: Effect of Starch-Based Coating on Fungal Diversity Nova Wahyu Pratiwi (a*), Chimayatus Solichah (a), Rina Srilestari (a), Antik Suprihanti (b), Aloula Galuh Mehak (a), Ari Try Kurniawan (a), Rosyid Hidayat (a), Aulia Ardhi (c) (a) Department of Agrotechnology, Faculty of Agriculture, Universitas Pembangunan Nasional Veteran Yogyakarta, Indonesia *nova.wahyupratiwi[at]upnyk.ac.id (b) Department of Agribusiness, Faculty of Agriculture, Universitas Pembangunan Nasional Veteran Yogyakarta, Indonesia (c) Department of Food and Agricultural Product Technology, Faculty of Agricultural Technology, Universitas Gadjah Mada, Indonesia Abstract Red chili (Capsicum annum L.) is one of the popular agricultural products that is used in several Indonesian foods. As general postharvest commodities characteristics, red chili is susceptible to physical threats and microbial contamination, leading to rapid deterioration and spoilage. One strategy to maintain the quality of red chili is the application of protective coatings that is reported to inhibit the growth of pathogens. This study aimed to identify the isolated fungal pathogens from red chili peppers that had been protected with an edible starch-based coating. The formulations of the starch-based coating involved the utilization of Arenga (Arenga pinata) and sago (Metroxylon sagu) starch, which were subsequently used for coating the red chili. Fungal isolates from both groups were isolated and identified using macroscopic and microscopic techniques. The results showed that the coated red chili peppers had a significantly lower fungal growth than the uncoated samples after 21-day storage, with the viable fungal isolates morphologically identified as Fusarium sp., Colletotrichum sp., and Cercospora sp. Keywords: Edible coating, fungal pathogens, red chili, starch Share Link | Plain Format | Corresponding Author (Nova Wahyu Pratiwi)

32	Agriculture	ABS-208
Sustainable agricultural practices to ensure future food security and environmental sustainability Partoyo Department of Soil Science, Faculty of Agriculture, Universitas Pembangunan Nasional Veteran Yogyakarta. Jl. Padjadjaran (Lingkar Utara) Condongcatur Yogyakarta 55283 partoyo[at]upnyk.ac.id Abstract Implementing the concept of sustainable agriculture is very strategic to meet food production targets while preserving the environment simultaneously. The current food production paradigm prioritizes food security and emphasizes that food must be met sustainably in quantity with good nutritional quality. This changes in the paradigm of diet quality make sustainable agriculture face even more complex challenges due to the issue of climate change which requires agricultural practices to adapt and even mitigate the impacts of climate change. Conventional agricultural techniques have proven effective in producing food, but on the other hand pose a real threat to environmental sustainability due to excessive use of resources, pollution, and degradation of biodiversity. Sustainable agriculture is relevant because it supports environmentally friendly, economically viable, and socially just practices. This technology involves the application of advanced technologies, including precision agriculture, genetically engineered crops for higher yields and disease resistance, and the integration of renewable energy sources into agricultural practices, climate-smart agricultural practices. Several agricultural cultivation technologies emphasize agroecological practices, including crop rotation, organic farming, and regenerative agriculture, that improve soil quality, reduce synthetic agrochemicals, and increase biodiversity. In addition, sustainable agriculture supports using local resources and traditional knowledge to maintain ecological balance while ensuring food production. This review shows that implementing sustainable agricultural practices is not just an option but necessary to ensure future food security and environmental sustainability. Keywords: Agriculture sustainability, food security, conventional agriculture, modern agriculture, climate change, soil quality. Share Link | Plain Format | Corresponding Author (Partoyo PARTOYO)

33	Agriculture	ABS-218
EFFECT OF CLIMATE CONDITION ON POTATO (Solanum tuberosum L.) PRODUCTIVITY IN PENGALENGAN AND NORTH MINAHASA H.A.R. Utami1), RR. Rukmowati Brotodjojo1)*), Mofit E. Poerwanto 1), Khuswatun Hasanah1), Laszlo Lakatos2) 1)Universitas Pembangunan Nasional Veteran Yogyakarta, Indonesia 2)Eszterhazy Karoly Catholic University, Hungary Abstract Potato is one of the subtropical horticultural crops that are widely cultivated in the highlands in Indonesia. Pengalengan and South Minahasa are two regions in Indonesia that are famous for their potato production. This study aimed to compare the effect of climate condition on potato productivity in Indonesia. This study used inferential statistical methods with two variables, they were the dependent variable and independent variable. The dependent variable used was potato productivity data in Pengalengan and South Minahasa, while the independent variable used were temperatures and rainfalls. The data in this study was analyzed using correlation analysis. Based on the results of the correlation analysis, it was known that temperatures had had a negative correlation on potato productivity in Pengalengan and South Minahasa. Later, it was discovered that rainfalls had negative correlation on potato productivity in Pengalengan and South Minahasa. However, neither temperatures nor rainfalls, had a significant effect on national potato productivity in Indonesia. This could be caused by the use of varieties that have high productivity and have low sensitivity to temperature and rainfall fluctuation. Keywords: Potatoes, productivity, Temperatures, Rainfalls Share Link | Plain Format | Corresponding Author (R.R. Rukmowati Brotodjojo)

34	Agriculture	ABS-224
Strategy for Development of Chili Agroindustri Products as Food Sovereignty Support in Daerah Istimewa Yogyakarta Dwi Aulia Puspitaningrum (a)- Muhammad Maulana Azimatun Nur (b)- Budi Widayanto(c) a,c.Agribusiness Department, Faculty of Agriculture,UPN Veteran Yogyakarta, Indonesia b.Chemistry Engineering Department, Faculty of Industrial Engineering. UPN Veteran Yogyakarta, Indonesia Abstract ABSTRACT. Chili one of the barometer economic products of each of the region in Indonesia because of the impact of it^s Agroindustri to economic-social welfare from upstream until downstream. Many kinds of strategies had done to manage this product, but every year there are many problems around chili Agroindustri for example: price fluctuation, supply chain of chili- Sustainability product- Market structure etc. This research was conducted in Daerah Istimewa Yogyakarta (DIY). The aimed of this study were 1). To Identify The external and internal Factors that having role of the strategic to improve The Agroindustri especially chili product. 2) To analyze and get solution strategic of the chili business in this regency. The research method was descriptive model. This type of research was a case study. The method of respondents had taken by purposive method. The type data was primary and secondary data. The method of collecting data was Focus Group discussion (FGD), interview, observation, record. Techniques analysis data of description to find out performance, business development strategy with Internal Factor Evaluation (IFE), External Factor Evaluation (EFE), Internal-Eksternal Matrix (IE), matrix of Strenghts, Weakness, Opportunities, and Threats (SWOT), and the Quantitative Strategic Planning Matrix (QSPM). Based on the research that had been done, the results of the research showed that 1) The EFE value of 2,97 and IFE of 3,10 which were matched with the IE matrix, the results of the IE matrix mapping are in cell IV. This strength map lays out the grow and build strategy. The strategies that can be implemented will be as intensive strategies (market penetration, market development, and product development) or integration Strategies (backward integration, forward integration, and horizontal integration). The end of the research we concluded that intensive strategies better than Integration Strategi. . Keywords: Chili , strategy, External Factor, Internal Factor, Intensive, Integration. Share Link | Plain Format | Corresponding Author (Dwi Aulia Puspitaningrum)

35	Agriculture	ABS-226
Determining Selection Criteria to Identify High Yielding in The Mutant Chili Genotypes (Capsicum annuum L.) Nailan Nabila (a*), Paksi Mei Penggalih (b), Rima Margareta Retnyo Gumelar (a), Amalia Nurul Huda (a), Alim Nuur Huda (a), Herlisa Kartika Jati (a), Wahyu Rohmat Ferdianto (a) a) Departement of Agrotechnology , Faculty of Agriculture, UPN Veteran Yogyakarta nailan.nabila[at]upnyk.ac.id b) Departement of agribusiness, Faculty of Agriculture, UPN Veteran Yogyakarta Abstract The performance of production and breeding mainly depends on the interrelationships among phenotypic traits. Correlation, multiple linear regression, stepwise regression, and path analysis were executed to investigate the relationships between yield components in chilli. The study was aimed to identify the phenotypic traits that recommended as selection criteria for improving production in putative chili mutants. The study was conducted using an augmented design with 8 replications. The experimental material consisted of 81 mutant genotypes and 3 controls. Fruit weight per plant was positively and significantly correlated with plant height, dichotomous height, stem diameter, leaf length, leaf width, fruit weight, fruit length, fruit diameter, fruit flesh thickness, and number of fruits per plant. Multiple linear regression revealed that fruit weight and number of fruits per plant contributed significantly. Stepwise regression analysis showed that phenotypic traits that have a significant effect on fruit weight per plant were plant height, dichotomous height, leaf length, fruit weight, and number of fruits per plant. The phenotypic traits that have the largest direct effect on fruit weight per plant were the number of fruits per plant and leaf length. According to these results number of fruits per plant and leaf length are recommended as selection criteria for improving putative chili mutant yield and play a critical role in the selection of chili breeding programs. Keywords: correlation- direct effect- path analysis- stepwise regression Share Link | Plain Format | Corresponding Author (Nailan Nabila)

36	Agriculture	ABS-243
Physico-chemical Characterization of a Biochar using a Fourier Transform Infra-Red Spectrophotometer and Physical Analysis: A Preliminary Study for Preparation of Heavy Metal Absorption Research Djoko Mulyanto(a), Arif Umami(b), Miseri Roeslan Afani(a), Ali Munawar(a) a). Department of Soil Science, UPN Veteran Yogyakarta, Indonesia b). Department of Agrotechnology, UPN Veteran Yogyakarta, Indonesia Abstract Biochar is a stable carbon-rich material produced from biomass through a pyrolysis heating method. The high carbon content, large surface area of the particles, and functional groups and cavities in certain shapes make biochar potential for various purposes, especially the binding of heavy metals and other pollutants from various wastes. To optimally use biochar as an adsorbent, it is necessary to understand its physical and chemical characteristics. This study aimed to characterize the physico-chemical properties of a biochar obtained from a local agricultural field. The Biochar of rice straw, each at a heating temperature of 300, 500, and 700 oC, was ground through 5 mesh and analyzed using FTIR to determine its functional groups. Proximate analysis of each biochar includes the content (% by weight) of water, volatile substances, ash, and % by weight of carbon to determine the material^s efficiency at heating temperature. The results showed that the higher pyrolysis temperatures of 300, 500, and 700 0C successively showed increasing average moisture content of 1.9%, 2.4%, and 3.3%, decreasing volatile content of 27.5%, 18.5%, and 11.6%, increasing ash content of 44.3%, 50.5%, 54.85%, and rising fixed carbon content of 26%, 28.5%, and 30%. The chemical structure evolution of biochar during rapid pyrolysis was studied using the FTIR method. The signal strength of the peak for hydroxyl groups ( O - H ) weakened concerning the raised temperature, indicating a reduction in hydroxyl group content. Rising temperatures also caused the reduction of aliphatic hydrocarbon ( C - H ), carbonyl, and carboxyl (C - O) bonds, whereas aromatic hydrocarbon content demonstrated the development of aromatization. Keywords: Adsorbent, biochar of rice straw, physico-chemical characterization Share Link | Plain Format | Corresponding Author (Djoko Mulyanto)

37	Engineering	ABS-256
A Comprehensive Review of Coal Desulfurization Techniques: Flotation Methods and Biobeneficiation Edy Nursanto (1), Rofa Dzulfikri Bulopa (1,2), Imam Prasetyo (3), Hendy Roesma Wardhana (3), and Shofa Rijalul Haq (1*) 1) Department Mining Engineering, Universitas Pembangunan Nasional Veteran Yogyakarta, Indonesia * shofa.haq[at]upnyk.ac.id 2) PT Studio Mineral Batubara, Yogyakarta, Indonesia 3) Department Metalurgical Engineering, Universitas Pembangunan Nasional Veteran Yogyakarta, Indonesia Abstract This review article critically examines contemporary coal desulfurization methods, with a primary focus on flotation processes and biobeneficiation techniques. The review synthesizes findings from multiple studies that employ various reagents, including biooxidation agents, biosurfactants, and plant extracts, in the desulfurization of coal. These studies demonstrate the potential of alternative reagents, such as continuous flotation systems using palm oil derivatives and biosurfactants from Sapindus rarak, to significantly reduce sulfur content while preserving or enhancing the calorific value of coal. Additionally, the application of biobeneficiation, particularly using mixotrophic bacteria, is explored for its dual capability in sulfur and ash reduction, presenting a promising complementary approach to traditional flotation methods. The article provides a comparative analysis of these techniques, evaluating the effectiveness of each method under varying conditions, such as pH, flotation time, reagent concentration, and air flow rates. Optimal conditions for maximum sulfur recovery and calorific value retention are identified, offering valuable insights for the development of more efficient desulfurization processes. The review also highlights the environmental benefits of these techniques, emphasizing the importance of selecting environmentally friendly reagents to reduce the ecological impact of coal utilization. This comprehensive analysis aims to inform future research and development efforts, paving the way for more sustainable and effective coal desulfurization strategies that align with global energy and environmental goals. Keywords: Coal- Flotation- Bioreagent- Desulphurization Share Link | Plain Format | Corresponding Author (Shofa Rijalul Haq)

38	Engineering	ABS-257
Accuracy of Satellite Data vs. Conventional Methods in Estimating Evapotranspiration and Evaporation: A Hydrological Analysis of the Serang Kulon Progo Sub-Basin with Land Use Variations Yohana Noradika Maharani, I Putu Gema Bujangga Waisnawa, Nandra Eko Nugroho, Maulana Khafid Arrohman, Wisnu Aji Dwi Kristianto Jurusan Teknik Lingkungan, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia. Environmental Engineering Department, Universitas Pembangunan Nasional Veteran Yogyakarta Abstract The need to integrate advanced technology in water balance analysis is emphasized, where traditional methodologies are often still conventional. There is a necessity to incorporate cutting-edge technologies such as remote sensing and dynamic hydrological models in water balance analysis to produce accurate assessments considering both hydrological and meteorological perspectives. The research problem focuses on the reliability and accuracy of satellite data in estimating evaporation under various climatic conditions and land uses, comparing it with conventional measurement methods. The methods used to address the research problem include several aspects, such as: (1) Conventional evapotranspiration and evaporation calculations analyzed via remote sensing using bands on Landsat ETM 8/9, and (2) Conventional evapotranspiration and evaporation calculations using the Modified Penmann method. The analysis predominantly employs a combination of several supporting quantitative methods. The research results indicate a correlation between detailed conventional calculations and the broader area coverage achievable through remote sensing. However, remote sensing results should always be compared with conventional measurements, as there are significant differences between the two. This research presents two novelties: (1) Population novelty, that is providing study on smaller and more detailed sub-basins, and (2) Empirical evidence novelty that provide the impact of land use based on the estimation of evapotranspiration and evaporation. Keywords: Evaporation, Evapotranspiration, Remote Sensing, Landsat, Modified Penmann. Share Link | Plain Format | Corresponding Author (Yohana Noradika Maharani)

39	Engineering	ABS-259
Seismic Vulnerability of Multi-Storey Buildings at UPN ^Veteran^ Yogyakarta using the Floor Spectra Ratio Method Arif Rianto Budi Nugroho (a), Yohana Noradika Maharani (b*), Yody Rizkianto (a), Ikhsan (c), Ariska Rudyanto (c) a) Geological Engineering Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia b) Environmental Engineering Department, Study Program of Disaster Management, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia *yohananm[at]upnyk.ac.id c) Meteorological, Climatological, and Geophysical Agency, Indonesia. Abstract Yogyakarta^s location in a plate subduction zone and nearby land faults make it the most active earthquake-prone region in Indonesia from a tectonic perspective. In addition to tectonic reasons, the construction of high-rise buildings, the expansion of public infrastructure, and dense populations all contribute to sensitivity to earthquake disasters. According to historical accounts, structures collapsing and striking individuals or their inhabitants is the primary cause of fatalities during earthquakes. The objective of this study is to assess the seismic vulnerability of multi-story buildings in the UPN Veteran Yogyakarta neighborhood. To do this, floor spectra ratio (FSR) analysis will be used to calculate the building^s dynamic response. Significant spectrum amplification within a given time frame indicates a structure^s susceptibility to resonance. The region of UPN Veteran Yogyakarta has a maximal bedrock acceleration of 0.25 g and is prone to earthquakes. Building vulnerability is determined by the FSR method, which is particularly useful in earthquake-prone areas since it may detect the possibility of vibration amplification from horizontal resonance, a sign of a building^s seismic vulnerability. According to the research findings, the land value is 2.6 Hz and 2.7 Hz, whereas the average natural frequency value of the rectorate building is 3.3 Hz and 3.4 Hz. The average natural frequency of the integrated laboratory building is between 2.5 and 2.7 Hz, while the soil frequency is 2.7 Hz. Consequently, seismic waves passing through the Integrated Laboratory Building may resonate in accordance with ground conditions, while the Rectorate Building may be amplified by them. Keywords: Floor Spectral Ratio, Earthquake, Multi-storey buildings, Seismic vulnerability, UPN Veteran Yogyakarta Share Link | Plain Format | Corresponding Author (Yohana Noradika Maharani)

40	Engineering	ABS-4
Comparative Study on the Effectiveness of Removing Indigo Carmine and Crystal Violet Using Biochar from Durian Peel (Durio Zibethinus) Retno Dwi Nyamiati, Putri Restu Dewati, Muhammad Redo Ramadhan, Ika Wahyuning Widiarti 1Departement of Chemical Engineering,Faculty of industrial Engineering,Universitas Pembangunan Nasional ^Veteran^ Yogyakarta,Indonesia 55283 2Department of Environmental Engineering, Faculty of Mineral Technology Universitas Pembangunan Nasional ^Veteran^ Yogyakarta,Indonesia 55283 Abstract This study aims to compare the effectiveness of durian peel biochar in removing indigo carmine and crystal violet compounds from aqueous solutions. Biochar was produced from durian peels through a pyrolysis process. Adsorption tests were conducted using solutions of indigo carmine and crystal violet at the same initial concentrations. The parameters investigated included adsorption capacity, contact time, and pH. Data were analyzed using Langmuir and Freundlich adsorption isotherm models to evaluate the adsorption mechanisms and capacities. The results indicate that durian peel biochar is effective in adsorbing both dye compounds, with a higher adsorption capacity for crystal violet compared to indigo carmine. The maximum adsorption capacity for crystal violet was 6.844 mg/g, while for indigo carmine it was 192 mg/g. The optimal contact time was found to be 60 minutes for both compounds. The adsorption isotherms followed the Freundlich model for both crystal violet and indigo carmine, suggesting that the adsorption onto durian peel biochar is a heterogeneous process with a limited maximum adsorption capacity. Durian peel biochar proves to be an effective adsorbent for removing both indigo carmine and crystal violet, with higher effectiveness for indigo carmine compared to crystal violet. These findings indicate the potential of durian peel biochar as an environmentally friendly material for treating industrial wastewater containing synthetic dyes. Keywords: Biochar, durian peel, adsorption, indigo carmine, crystal violet, waste treatment Share Link | Plain Format | Corresponding Author (Retno Dwi Nyamiati)

41	Engineering	ABS-260
Tsunami Modeling Scenarios triggered by Undersea Landslides: Case Study of the Southern Region of Java Yohana Noradika Maharani (a*), Ikhsan (b), Fauzi (b), Lysa Dora Ayu Nugraini (c), Mochammad Prahastomi Muttahari (d) a) Environmental Engineering Department, Study Program of Disaster Management, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia *)yohananm[at]upnyk.ac.id b) Meteorological, Climatological, and Geophysical Agency, Indonesia c) Geomatics Engineering, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia d) Geological Engineering, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia Abstract The research models the potential tsunami damage resulting from landslides under the sea in Yogyakarta^s southern region. Six undersea landslides have been found on the eastern side of Sunda, between Central Java and Sumba Island, according to bathrimetric data. The waters to the south of Java, Indonesia, are particularly susceptible to avalanche tsunami events because of the unstable underwater slopes along the southern coast of Java and its close proximity to coastal areas with high population densities. The Cornell Multi-grid Coupled Tsunami Model (COMCOT) will be utilized in this research for modeling tsunami scenarios brought on by undersea landslides. A simulation of the propagation and run-up of tsunamis using bathymetry, topography, survey data, and marine characteristics is conducted in the southern portion of the Yogyakarta Special portion. A map of tsunami scenarios from tectonic causes (earthquakes) and underwater landslides was created by calculating the height and distance of tsunami inundation for landslide scenarios using different dimensions and volumes. According to the results of the tsunami modeling, the tsunami at Samas Beach in Sanden District achieved a height of 10.85 meters along the coast, with a submergence reach of 1.96 kilometers. On the Depok - Kretek District chain, the tsunami achieves a height of 8 meters, with a soaking range of 1.59 kilometers. Understanding the nature of underwater landslides and their potential to cause tsunamis is crucial for developing early warning systems and disaster preparedness in the region. Keywords: Undersea landslides, Tsunami, COMCOT, Modeling, Southern Java Share Link | Plain Format | Corresponding Author (Yohana Noradika Maharani)

42	Engineering	ABS-261
The Role of Disaster Safe Education Units in Earthquake Disaster Preparedness for Students as a Vulnerable Group - Literature Review Ahmad Syarif (a), Jaka Purwanta (b), Eko Teguh Paripurno (c), Yohana Noradika Maharani (d*), Johan Danu Prasetya (e) a) Student of Study Program of Disaster Management, Environmental Engineering Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia. b, c, d, e) Study Program of Disaster Management, Environmental Engineering Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia. *Corresponding author e-mail: yohananm[at]upnyk.ac.id Abstract Indonesia is positioned in an area prone to natural disasters due to its location near the tectonic plate boundary. Children are a susceptible population because of their lack of understanding of disaster dangers, particularly earthquakes, which frequently strike without notice. Earthquakes frequently kill people, particularly underprivileged children. Early earthquake mitigation education and simulation, particularly through the Disaster Safe Education Unit (SPAB) program in schools, is critical for disaster risk reduction. The purpose of this study is to assess the effectiveness of the disaster safety education curriculum in boosting preparation knowledge and behavior through a systematic review using meta-synthesis and meta-analysis approaches. The findings demonstrate that disaster preparedness education significantly improves students^ understanding of earthquakes and their attitudes and behaviors in response to them. The study^s conclusion highlights the significance of the SPAB program in raising students^ awareness of earthquake disaster preparedness because it is an essential step in enhancing the resilience of the school community to disasters by raising awareness of disasters and enhancing preparedness. It also highlights the necessity of incorporating disaster-safe education into the curriculum and conducting regular training sessions with local disaster management organizations. Keywords: Disaster safe education, Disaster preparedness, Earthquake, Students, SPAB Share Link | Plain Format | Corresponding Author (Jaka Purwanta)

43	Engineering	ABS-6
A Conceptual Model for Warehouse Management System in the Leathercraft Industry: An Integration of SSM and UML Vynska Amalia Permadi(a), Dian Indri Purnamasari(b*), Riza Prapascatama Agusdin(c), Partoyo (d) a,c) Informatics Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Jl. Babarsari 2, Tambakbayan, Sleman, Yogyakarta b) Accounting Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Jl. Padjajaran 104, Sleman, Yogyakarta *dian_indri[at]upnyk.ac.id d) Soil Science Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Jl. Padjajaran 104, Sleman, Yogyakarta Abstract The leathercraft industry, characterised by intricate manual processes and a heavy reliance on skilled artisans, presents unique challenges for warehouse management. Existing literature has not extensively explored the specific requirements of a Warehouse Management System (WMS) for this sector. This research proposes a conceptual model for a leathercraft WMS by integrating Soft Systems Methodology (SSM) and Unified Modelling Language (UML). SSM^s capacity to address complex and ill-structured systems aligns with the challenges of capturing the nuances of leathercraft operations, whilst UML provides a structured approach for translating the conceptual model into a practical system design. The findings of this research can serve as a valuable resource for the development of a WMS to enhance operational efficiency within the leathercraft industry. Keywords: Leathercraft industry, Soft Systems Methodology (SSM), Unified Modelling Language (UML), Warehouse Management System (WMS) Share Link | Plain Format | Corresponding Author (Dian Indri Purnamasari)

44	Engineering	ABS-7
An Analysis of Anaerobic Codigestion of Palm Oil Mill Effluent and Other Potential Feedstock Nina Anggita Wardani (a*), Danang Jaya (a), Tunjung Wahyu Widayati (a), Eko Nursubiyantoro (b) a) Chemical Engineering Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Jalan SWK 104 (Lingkar Utara), Sleman, 55283, Indonesia *nina.anggita[at]upnyk.ac.id b) Industrial Engineering Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Jalan Babarsari No. 2. Tambak Bayan, Sleman, 55281, Indonesia Abstract Widely recognized as a potential feedstock for generating biomethane, palm oil mill effluent (POME) availability may become limited. This condition will require alternative feedstocks. Anaerobic codigestion (ACoD) has been studied for optimizing POME processing. A significant advantage of ACoD is the optimal C:N ratio achieved by combining substrates without any pretreatment. Several studies on ACoD of POME and other palm oil wastes have been conducted. Co-digesting POME and decanter cake (DC) at 55&#8451- without any further additives for optimizing the C:N ratio resulted in a methane yield of 408.88 mL CH4/g VS. This paper will discuss the advantages of ACoD of POME and other wastes and suggest ACoD implementation in accordance with the future commitments of the palm oil industry. Keywords: C:N ratio- biomass- biogas- biomethane Share Link | Plain Format | Corresponding Author (Nina Anggita Wardani)

45	Engineering	ABS-8
Influence of Thermal Operation Condition on Anaerobic Digestion of Palm Oil Mill Effluent: A Review Nina Anggita Wardani (a*), Muhammad Redo Ramadhan (a), Dian Purnami Handayani (a), Eni Muryani (b) a) Chemical Engineering Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Jalan SWK 104 (Lingkar Utara), Sleman, 55283, Indonesia *nina.anggita[at]upnyk.ac.id b) Environmental Engineering Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Jalan SWK 104 (Lingkar Utara), Sleman, 55283, Indonesia Abstract Palm oil is one of the biggest commodities in tropical countries. Its massive production generates palm oil mill effluent (POME) as waste. Due to its high concentration of organic matter, POME should be processed before being released. One of the most promising methods for processing POME is anaerobic digestion (AD). AD is widely known as a sustainable technology implemented in various industries for processing their organic waste. Tropical countries prefer the AD process which operates under mesophilic conditions due to its similarity with tropical room temperature. Several studies on thermophilic AD of POME have found high methane concentrations, up to 77.33%. Future research should highlight the advantages of thermophilic AD, which are totally worth the tedious temperature control operation. Keywords: thermophilic- mesophilic- biogas- biomethane Share Link | Plain Format | Corresponding Author (Nina Anggita Wardani)

46	Engineering	ABS-265
Thermogenic And Biogenic Coalbed Gas in Samboja Area Kutai Basin East Kalimantan Teguh Setiawan1, Basuki Rahmad1, Siti Umiyatun1, Sugeng Raharjo1 1Doctoral Program, Geological Engineering, Department of Geological Engineering Faculty of Technology Mineral and Energy Universitas Pembangunan Nasional ^Veteran^ Yogyakarta, Indonesia Abstract Coal is one of the primary non-renewable energy sources in Indonesia. In coal, there are various gases, mainly methane gas. Currently, the utilization of coal gas energy, known as coalbed methane, is very limited. Coal gas origin analysis aims to determine the type of origin gas, thermogenic or biogenic so that this can determine potential areas for coalbed gas exploration and exploitation. A total of 2 drilling wells, X130 and X47, took ten core sample data on coal which were analyzed for gas isotopes d13C1 and dDC1- the result is d13C1 range between -37.3o/oo - (-61.3o/oo) and dDC1 range between -170o/oo - (-267o/oo). Based on gas isotope, it can be interpreted that the Samboja Area has three types of origin gas: biogenic, transition, and thermogenic. Keywords: Coal, gas isotope, biogenic, thermogenic. Share Link | Plain Format | Corresponding Author (Siti Umiyatun Choiriah)

47	Engineering	ABS-10
Monitoring Magma Deformation and SO2 Concentration of Ili Lewotolo Volcano in Multi-years using NSBAS InSAR and Sentinel-5P Naufal Setiawan1a, Maulana Yudinugroho1, Wanidya Ni^immallaili Hadining2, Amira Jasmine Dentalisya1, Fadhilla Febriani Khoiru Imroah1, Rana Jaladara1 1Geomatic Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta, Indonesia. 2Metalurgy Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta, Indonesia. Abstract In November 2020, the Ili Lewotolo Volcano erupted after eight years of dormancy, releasing ash, hot clouds, lava, and toxic gases. Thus, volcanic activity needs to be monitored periodically. This study analyzed magma movement speed and SO2 concentration after the eruption. Magma velocity was measured using Sentinel-1 images descending orbits with the New Small Baseline Subset (NSBAS) method, and SO2 levels were detected using Sentinel-5P images with Tropospheric Monitoring Instrument (TROPOMI), both utilizing Python programming. This innovative combination of multi-temporal InSAR and imaging spectrometry offers a new approach to volcano research. Our preliminary results showed a poor correlation in long-term InSAR results from the descending orbit due to dense vegetation. Post-eruption Sentinel-5P results indicated higher SO2 levels around the volcano. Future work will process the ascending orbit of Sentinel-1, correct the SO2 base map, and extend the analysis period. Keywords: Volcano, InSAR, NSBAS, Sentinel-5P, SO2 Share Link | Plain Format | Corresponding Author (Naufal Setiawan)

48	Engineering	ABS-266
Analysis of Mangrove Forest Vegetation Diversity (Location: Karimunjawa and Yogyakarta) Johan Danu Prasatya1, Avido Yulistan2, Purvadi Wahiyuni3, Fitrian Nujud Priyandeni 4, Hasna Ivithania Putri 5, Reshinda Zulfa 6 UPN ^Veteran^ Yogyakarta Abstract Mangrove forests are unique and diverse ecosystems, found in tropical and subtropical intertidal regions, especially in Indonesia. Mangrove ecosystems grow on sheltered beaches, lagoons, and river estuaries that are affected by the tides of sea water. The ecological function of mangroves is very important as a coastal protector from abrasion, a control of the rate of sedimentation in the upper reaches of the river, a control of the rate of seawater intrusion, a protected habitat for various marine life, and productivity for aquaculture commodities. The purpose of this study is to determine the diversity index and water quality in 3 mangrove forest locations, namely Karimunjawa, Kulonprogo, and Baros. The method used is purposive sampling with data collection directly in the field. The results obtained were that the diversity index value in the three locations was relatively low and in the range of 0 - 0.7552, and the quality of the aquatic environment in the three locations was relatively good. Keywords: Diversity, Mangroves, Waters Share Link | Plain Format | Corresponding Author (Johan Danu Prasetya)

49	Engineering	ABS-13
Improving the Batik MSME Information Systems by Applying 3D Geospatial Modeling Dwi Wahyuningrum, Oktavia Dewi Alfiani, Siti Rokhimah Universitas Pembangunan Nasional Veteran Yogyakarta Abstract The concept of geovisualization in 3D form can be an alternative to improve the visualization and promotion of MSME location information. The public as consumers is not only limited to visiting physically or viewing photos/ videos from the online account of batik MSMEs, but also gets an idea of the location where the business is located. This research aimed to apply the concept of geovisualization and develop a 3D model of Batik MSME locations in Yogyakarta City. This research utilized spatial data in the form of MSME locations in the form of coordinate points along with complementary information as attributes. Furthermore, data processing was carried out using the QGIS2ThreeJs plugin to produce geovisualization in a three-dimensional model. The result is a visualization of the distribution of Batik MSME locations in Yogyakarta City with a basemap from mapbox equipped with a 3D model. The whole thing is presented on a website-based platform. Keywords: Geospatial Information System, WebGIS Development, Geovisualization, 3D Modeling, Routing and Navigationt Share Link | Plain Format | Corresponding Author (Dwi Wahyuningrum)

50	Engineering	ABS-14
The Impact of Climate Change on Reservoir Water Quality - A Literature Review Nuha Amiratul Afifah, Riska Aprilia Triyadi, Tiara Sarastika, Fairy Virta Ramadhea, Rendy Colif Nurrahman, Syuhulin Darwobawong1 Department of Environmental Engineering UPN Veteran Yogyakarta, Jl. Pajajaran Condong Catur, Yogyakarta, Indonesia- Department of Soil Science UPN Veteran Yogyakarta, Jl. Pajajaran Condong Catur, Yogyakarta, Indonesia Abstract The emergence of climate change affects water resources such as reservoirs, which are essential in meeting the needs of households, agriculture and industries. This review uses a variety of sources to bring together the information about climate change effects on water quality in reservoirs. Rainfall patterns, increasing temperatures and altered runoff rates are significantly affected by changes in precipitation. The increased rain intensity causes more runoff into reservoirs containing higher amounts of sediments, nutrients and pollutants while prolonged periods of drought lower the water levels thus increasing pollutant concentrations. Such a trend is also associated with an increase in temperature that leads to thermal stratification as well as mixing processes that facilitate harmful algal blooms and chemical reactions within the medium. Additionally, this article captures regional differences in impacts and evaluates several mitigation techniques as well as adaptation approaches adopted. Moreover, by unraveling how climate change affects reservoir water quality managers can identify knowledge gaps and adapt to new environmental conditions through resilience building practices. Keywords: climate change, reservoir water quality, runoff and sediment, thermal stratification, mitigation and adaptation Share Link | Plain Format | Corresponding Author (Nuha Amiratul Afifah)

51	Engineering	ABS-15
Carbon Dioxide (CO2) Storage Modelling, Mechanisms, and Effects of Water Injection with sensitivity permeability Allen Haryanto Lukmana, Nahsya Aprilia Tuhulele, Avianto Kabul Pratiknyo, Ristiyan Ragil Putradianto, Andiko Putro Suryotomo Department of Petroleum Engineering, Faculty of Mineral Technology, UPN Veteran Yogyakarta, Jl. Ringroad Utara, Condongcatur, Yogyakarta, Indonesia, 55283 Department of Informatics, Faculty of Industrial Engineering, UPN Veteran Yogyakarta, Jl. Babarsari 2, Tambak Bayan, Yogyakarta, Indonesia, 55281 Abstract Carbon dioxide (CO2) sequestration is essential to address the rising levels of global CO2 emissions, which reached 30.6 gigatons in 2020 (IEA, 2020). Understanding the interplay between structural, residual, solubility, and mineral trapping mechanisms in carbon sequestration, particularly in water injection, is essential for effective climate change mitigation. Investigating these mechanisms under different water injection conditions is crucial for refining carbon sequestration methods. This research analyzes the effect of water injection on CO2 sequestration in high and low permeability reservoirs. By employing the Geochemical EOS Compositional Simulator (GEM), we analyzed the behavior of structural, residual, solubility, and mineral trapping mechanisms under varying water injection conditions. Results indicate that, in both high and low permeability reservoirs, the simultaneous injection of CO2 and water leads to a notable reduction in the amount of CO2 remaining in the supercritical phase, highlighting improved trapping efficiency through enhanced residual and solubility trapping mechanisms. The observed improvements in residual and solubility trapping with water injection indicate that this method can significantly enhance CO2 sequestration efficiency, minimize leakage risks, and bolster long-term storage stability. Our findings suggest that water injection is a promising strategy for enhancing CO2 sequestration and mitigating climate change. Keywords: CO2 emission, climate change, sequestration, trapping mechanism, water injection Share Link | Plain Format | Corresponding Author (Nahsya Aprilia Tuhulele)

52	Engineering	ABS-18
SYNTHESIS OF SYNTHETIC BRINE AS AN ALTERNATIVE FOR FORMATION WATER TESTING TO ESTIMATE SCALE INDEX (CO3 VARIALBLE IN FORMATION WATER) Fanata Yudha Nugraha (a*), Ega Dimas Saputra (a), Carin Nova Azzaria (a), Brian Tony (a), Dian Indri Astuti (a), I Putu Gema Bujangga Waisnawa (b) a) Petroleum Engineering Department, UPN ^Veteran^ Yogyakarta *fanata.yudha[at]upnyk.ac.id b) environmental Engineering Department, UPN ^Veteran^ Yogyakarta Abstract The decreased oil production due to scaling in production equipment results in losses. In oil wells, ions such as calcium, barium, carbonate, sulfate, magnesium, sodium, and chloride are commonly present in formation water and are the main contributors to scaling. This study focuses on creating synthetic brine with a composition resembling field formation water as an alternative solution for rapid laboratory-scale measurement of the scale index. The research involves stages of synthetic brine preparation, physical and chemical testing of the brine, comparison with formation water, and calculation of the Stability Index (SI) using Stiff & Davis method. The results indicate that synthetic brine can be prepared based on laboratory analysis of field samples by estimating the materials and masses present in formation water, thus allowing replication using natural or chemical materials in the laboratory while considering parameters such as pressure, temperature, and pH during the manufacturing process. The pH significantly impacts the risk of scale formation, where a slightly basic pH, around pH 8, supports higher concentrations of carbonate ions (CO32-) and bicarbonate ions (HCO3-), thereby increasing the risk of scale formation. Keywords: Synthetic Brine- Scale- Formation Water Share Link | Plain Format | Corresponding Author (Fanata Yudha Nugraha)

53	Engineering	ABS-19
The effects of artificial aging treatment on the mechanical properties of alumunium 7075 imam prabowo, muhammad ichsan, mansyur abdul shaleh, naufal setiawan Teknik Metalurgi, Universitas Pembangunan Nasional Veteran Yogyakarta Abstract The aerospace industry requires 7075 aluminium as a material for aircraft bodies, but it must have high strength and good corrosion resistance so that to obtain these properties, it is subjected to T6 aging heat treatment, which is carried out through Solution heat-treated, followed by aging at a higher temperature (around 160-190 C) to achieve maximum strength. To begin with, aluminium is cast to a high temperature of 550 C to dissolve the alloying elements in the matrix then rapid cooling is carried out and finally an aging process is carried out at a lower temperature, usually between 180 C. The aluminium was tested for tensile strength using ASTM E8/E8M standard and hardness using ASTM E384-17 standard.The 7075 T6 aluminium material has higher average tensile strength (UTS) and yield strength values than the 2075 T0 aluminium material, namely 442.053 MPa and 274.48 while the average UTS and yield strength values of 7075 T0 aluminium are 176.61 MPa and 61.27 MPa respectively. Elongation for 7075 T6 aluminium material is 18.02% and for 7075 T0 aluminium material, 19.27% is obtained for its elongation. In aluminium 7075 T0 obtained hardness test results of 54.66 HB, while in aluminium 7075 T6 obtained hardness test results of 148.27 HB. The value of tensile strength and yield strength in 7075 aluminium is higher than aluminium 7075 T0 as well as in aluminium 7075 T6. Keywords: alumunium 7075, tensile strength, hardness, T6 heat treatment, elongation Share Link | Plain Format | Corresponding Author (Imam Prabowo)

54	Engineering	ABS-20
Low-Rank Coal and Self-Combustion of Coal in Indonesia Edy Nursanto, Dessyanto Boedi Prasetyo, Bambang Supriyanta and Heru Suharyadi Universitas Pembangunan Nasional Veteran Yogyakarta Abstract Indonesia^s low-rank coal, also known as lignite, is a type of coal with a relatively low energy content, high moisture content, and high volatility. These characteristics make it more susceptible to spontaneous combustion, a significant challenge in coal mining and storage. Characteristics of Low-Rank Coal that is High Moisture Content: Typically contains 30-40% moisture, which can lead to a higher risk of spontaneous heating. High Volatility: The presence of volatile matter increases the tendency of the coal to ignite spontaneously. Low Energy Content: Lower calorific value compared to higher-rank coals like bituminous and anthracite. Self-combustion, or spontaneous combustion, occurs when coal heats up due to oxidation without an external heat source. The oxidation process generates heat, and if the heat is not dissipated, it can cause the coal to ignite. Factors Contributing to Self-Combustion Coal Properties: High moisture and volatile content increase susceptibility. Storage Conditions: Large coal piles with poor ventilation trap heat. Environmental Factors: High ambient temperatures and humidity can accelerate the oxidation process. Handling Practices: Crushing and transporting coal can expose fresh surfaces to oxidation. Managing the risks associated with low-rank coal and spontaneous combustion is crucial for safety and efficiency in the coal industry. By understanding the factors that contribute to self-combustion and implementing appropr Keywords: low-rank coal, self-combustion, mitigation of coal self-combustion Share Link | Plain Format | Corresponding Author (EDY NURSANTO)

55	Engineering	ABS-21
Simulation of ^U-Champ^ Biosurfactant Concentration and Soaking Time on Core Flooding to obtain the Optimum Scenario Harry Budiharjo Sulistyarso, Diyah Rosiani, Joko Pamungkas, Sayoga Heru P, Indah Widiyaningsih, Farizah Istifatkhul Nadhifa, Aici Ichtiarizak Machrifah UPN Veteran Yogyakarta and Politeknik Energi dan Mineral Akamigas Cepu Abstract A coreflooding experiment was conducted in the enhanced oil recovery (EOR) laboratory, where the biosurfactant ^U-Champ^ was injected into the synthetic core. The experiment demonstrated that it yielded a higher oil recovery compared to waterflooding. Regrettably, the experiment employed a sole concentration of biosurfactant. In order to determine the most favorable conditions for the ^U-Champ^ biosurfactant, a simulation experiment was conducted using commercially available software. Three scenarios have been developed to forecast the effectiveness of u-champ biosurfactant injection. The initial simulation emphasizes concentration, whereas the subsequent scenarios prioritize soaking time. The study found that the optimal outcome yielded an oil recovery rate of 87.46% by utilizing a 6% concentration of u-champ biosurfactant and soaking the solution for 1 hour, 8 hours, and 10 hours. This experiment yielded superior results compared to a laboratory experiment including a 7.5% concentration of u-champ biosurfactant. The experiment involved soaking the mixture for 1 hour, 24 hours, and 48 hours, resulting in an oil recovery rate of 81.58%. Keywords: Biosurfactant, soaking time, optimum scenario, Recovery Factor Share Link | Plain Format | Corresponding Author (Harry Budiharjo Sulistyarso)

56	Engineering	ABS-22
Domestic Wastewater Treatment Technologies for the Small-Scale Food Processing Industry in Indonesia: A Review Husna Muizzati Shabrina (a*), Nuha Amiratul Afifah (a), Yudhistira Saraswati (b), Muhammad Iqbal Miftahudin (a), Febrica Citra Faradilla (a), Ufiya Cahaya Adhina (a) a) Department of Environmental Engineering, UPN Veteran Yogyakarta, Jl. Padjajaran Ringroad no 104, Sleman 55283, Indonesia *husna.muizzati[at]upnyk.ac.id b) Department of Agribusiness, Jl. Padjajaran Ringroad no 104, Sleman 55283, Indonesia Abstract As Indonesia experiences rapid urbanization and industrial growth, managing wastewater effectively has become imperative to mitigate environmental pollution and safeguard public health. This review aims to identify and evaluate the effectiveness, cost-efficiency, and suitability of different treatment methods within the Indonesian context. Indonesia^s small-scale food processing sector, which includes activities like tofu production, palm sugar processing, and fish processing, produces substantial amounts of wastewater rich in organic matter and nutrients. Conventional treatment systems such as septic tanks and simple filtration units are commonly used but often fail to meet environmental regulations due to design flaws and inadequate maintenance. Advanced treatment technologies, including anaerobic digestion, constructed wetlands, and biofilters, have been introduced with varying levels of success. Anaerobic digesters are recognized for their ability to reduce organic load while generating biogas, providing a renewable energy source. Constructed wetlands are noted for their low operational costs and adaptability to different scales of operation, making them suitable for rural and semi-urban areas. The review also addresses the challenges small-scale food processors face, including financial limitations, lack of technical knowledge, and insufficient regulatory support, which impede the adoption of advanced treatment technologies. Recommendations for policy interventions include providing financial incentives, technical training, and fostering public-private partnerships to enhance the implementation of sustainable wastewater management practices. In conclusion, the adoption of appropriate wastewater treatment technologies in Indonesia^s small-scale food processing industry is crucial for environmental sustainability and public health. Collaborative efforts among stakeholders are essential to overcome existing barriers and promote the effective management of wastewater. Keywords: Domestic wastewater treatment, Small-scale food processing, Indonesia, Anaerobic digestion, Constructed wetlands Share Link | Plain Format | Corresponding Author (Husna Muizzati Shabrina)

57	Engineering	ABS-25
MAPPING THE POTENTIAL OF CARBON CAPTURE AND STORAGE IN THE PETROCHEMICAL INDUSTRY IN EAST JAVA Brian Tony (a), M. Firdaus Al Hakim (b*), Dessy Apriyanti (c), Damar Nandiwardhana (a), Puji Hartoyo (a), Fanata Y. Nugraha (a), Steven Chandra (d), Kesuma Ardhana Oerika (a) a) Department of Petroleum Engineering, UPN Veteran Yogyakarta, Indonesia b) Department of Geophysical Engineering, UPN Veteran Yogyakarta, Indonesia *muhamad.firdausalhakim[at]upnyk.ac.id c) Department of Geomatic Engineering, UPN Veteran Yogyakarta, Indonesia d) Department of Petroleum Engineering, Institut Teknologi Bandung, West Java, Indonesia Abstract East Javas petrochemical sector contributes significantly to greenhouse gas emissions, especially carbon dioxide (CO). The possibility for deploying Carbon Capture and Storage (CCS) technology within this industry needs to be thoroughly evaluated in order to address these emissions and help Indonesias commitments to lowering its carbon footprint. The purpose of this study is to map the potential of CCS in East Javas petrochemical industry by evaluating the opportunities, difficulties, and viability of its deployment. Industry papers, government publications, and scholarly research were among the main and secondary sources from which data for this study were gathered. To obtain thorough information, we assessed the sites and spoke with important stakeholders via surveys and interviews. The studys main objectives were to map potential geological storage locations in East Java, assess current CCS technology, and identify the main sources of CO2 emissions. Our research suggests that the petrochemical sector in East Java offers a large number of prospects for CCS. Numerous sites with high emissions have the infrastructure required to enable carbon capture procedures. Furthermore, the geological formations of East Java offer viable choices for the storage of CO2 multiple sites have been discovered that have high storage capacity and stability. The report does, however, also draw attention to a number of difficulties, such as the need for technology developments, regulatory obstacles, and high initial implementation costs. Engaging stakeholders and raising public awareness are essential to the effective implementation of CCS technologies. To address these issues and speed up the regions adoption of CCS, policy suggestions and strategic actions are put forth. Finally, a mapping of the potential of CCS in the petrochemical industry of East Java indicates both noteworthy problems and considerable prospects. Coordinated efforts by the government, business community, and academic institutions to address these problems can help Indonesia achieve its larger climate goals and open the door for sustainable carbon management. Keywords: Carbon Capture and Storage- CO2 sink- Carbon Capture Utilitation Storage CCUS Share Link | Plain Format | Corresponding Author (Brian Tony)

58	Engineering	ABS-26
APPLICATION MACHINE LEARNING (DECISION TREE) IN DETERMINING REACTIVATION CANDIDATES IDLE WELL AT PT. PERTAMINA EP REGIONAL 4 ZONE 11 CEPU FIELD Boni Swadesi, Hariyadi, Damar Nandiwardhana, Geovanny Branchiny Imasuly, and Herlina Jayadianti UPN Veteran Yogyakarta Abstract Indonesia has a tough challenge with realizing oil production of 1 million barrels per day by 2030 by relying on old fields or mature (brownfield), which seeks to exploit the remaining hydrocarbons. One of the targets is the reactivation of idle wells at PT. Pertamina EP Regional 4 zone 11 Cepu field, research and innovation development focused on production is carried out idle well. In this research, reactivation candidates were determined to idle well. The first stage is to define the problem to understand the influencing factors of idle well and information about recent developments in predicting the determination of reactivation candidates. Data collection in the form of primary and secondary documents for 2018-2023. The next stage is implementing Machine Learning (ML) (Decision Tree (DT)) to be able to overcome the problems of data accuracy and complexity, as well as create efficient and accurate classification patterns, a Web Application which can help decision-makers in determining which wells should be reactivated which can provide the best solution to the problem of increasing oil recovery. The research results show a high success rate on Accuracy Under Curve (AUC) and Receiver Operating Curve (ROC), amounting to 0.99 which shows that the classification model has a high probability, using entropy two potential wells were obtained for reactivation based on Lifting method (ESP) namely wells NGL-P-001 and TPN-004 with Well Cum Prod (Np, MBO) (107.89 then 132.570 MBO) then HC Remaining Potential (Oil, MBO) (4,609 and 52.42 MBO), with recommendations for improvement, namely Well Service. Of the two wells that meet the reactivation criteria based on the model decision tree, an evaluation is carried out by Decline Curve Analysis (DCA) where the lower the MSE, the better the fit and model Hyperbolic and Stretched Exponential, which yielded the lowest values of 1106.6 and 1142.35, thus indicating that the model may be the best fit among the models considered. The results of forecast production rate vs cumulative oil production were used to predict future oil production and cumulative oil amounting to 4451.22 BBL was obtained. Keywords: Machine Learning, Reactivation, Idle Well, Decision Tree, Increased Oil Recovery Share Link | Plain Format | Corresponding Author (Boni Swadesi)

59	Engineering	ABS-28
CO2 INJECTION PLANNING USING COMPOSITIONAL RESERVOIR SIMULATION: A REVIEW Dedi Kristanto, Hariyadi, Eko Widi P, Aditya Kurniawan, Unggul Setiadi N, Muhammad Iqbal Arizzqi Nuzli, Fadli Ramdhani UPN Veteran Yogyakarta Abstract Reservoir simulation modeling is a technique used in reservoir engineering to accurately represent or replicate a reservoir in the form of a physical reservoir. Reservoir simulation modeling is categorized into three types depending on specific requirements: black oil reservoir simulation, compositional reservoir simulation, and thermal reservoir simulation. This study employs compositional simulation to investigate the impact of liquid or gas composition on changes in PVP. Reservoir composition simulations are capable of describing a wide range of compositional situations that cannot be captured by black oil simulations. These conditions include reservoir fluid phase behavior, multi-contact miscibility, immiscible or near-miscible pressure, all of which are influenced by the composition of the reservoir. Composition is connected to phase characteristics such as viscosity, density during displacement, and the impact of Interfacial Tension (IFT) on the remaining oil saturation (Sor). CO2 injection can be classified into two categories: immiscible flooding and miscible flooding. The CO2 injection mechanism involves several methods: continuous injection, carbonate water injection (also known as CO2 slug injection followed by water), simultaneous CO2 and water injection, and simultaneous and alternating CO2 injection. When CO2 gas is present, it dissolves the oil, causing a decrease in its density and viscosity. One benefit of utilizing CO2 injection is the ability to acquire CO2 gas from waste gas or reservoirs that contain CO2. Carbon dioxide (CO2) is considered environmentally benign and has a low propensity for explosion. Keywords: compositional simulation, CO2 injection, simultaneous injection, alternating injection Share Link | Plain Format | Corresponding Author (Dedi Kristanto)

60	Engineering	ABS-29
INVESTIGATION OF SAND CONTROL USING RESIN AND GRAVEL PACK METHODS IN OVERCOMING SAND PROBLEMS: A REVIEW Suranto1, Boni Swadesi1, Dedi Kristanto1, Herlina Jayadianti2 UPN Veteran Yogyakarta Abstract The occurrence of sand production is a widespread problem in the oil and gas industry, frequently resulting in operational inefficiencies and damage to equipment. Efficient techniques for managing sand are crucial in order to address these difficulties and guarantee maximum productivity. This review examines the effectiveness of resin and gravel pack techniques in resolving sand-related issues, including a substantial amount of data, statistics, and case studies. The resin approach, which entails injecting resin-coated sand into the formation, has demonstrated potential in stabilizing unconsolidated formations. Resin systems have the ability to greatly decrease sand output by effectively bonding sand grains, hence improving the durability of formations. On the other hand, the gravel pack method, which involves depositing a layer of gravel between the formation and the wellbore, is well recognized as a reliable strategy for controlling sand. The significance of choosing the suitable gravel size to prevent the infiltration of sand while preserving permeability. Field applications statistics demonstrate that gravel packs can achieve sand retention efficiencies surpassing 90%, while having negligible impact on well productivity. Both the resin and gravel pack systems provide effective solutions for sand control, each with distinct benefits and constraints. When selecting a method, it is important to evaluate the peculiarities of the formation, operational aspects, and economic concerns. Additional investigation and practical experiments are necessary to improve these methods and expand their use in various geological environments. Keywords: gravel pack, sand control, resin, sand problem Share Link | Plain Format | Corresponding Author (Suranto Ahmad Muraji)

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