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91	Engineering	ABS-130
Bibliometric Analysis of Land Use Change Research Trends with Spatial Dynamics System Puryani (a), Chaeron M (a), Algary TA (b), Santoso DH (b*), Gadhing AP (b), Rusita E(b), Nandita Zahra(b), Zahirah AP(b), Fahri RA(b), Hilmi IK(b), Nuansa MR(b) Universitas Pembangunan Nasional Veteran Yogyakarta (a)Departement of Industrial Engineering, Faculty of Industrial Engineering, UPN Veteran Yogyakarta (b)Departement of Environmental Engineering, Faculty of Mineral Technology, UPN Veteran Yogyakarta *dian.hudawan[at]upnyk.ac.id Abstract This article describes the bibliometric nature of land use alteration with a particular focus on spatial dynamics. Through the use of Scopus^ metadata and advanced visualizations, the research explores the increasing popularity of publications about land use change, it focuses on topics like the influence of population growth on land use patterns, the dynamics of urban development, and the utilization of remote sensing and geographic information systems (GIS) for analyzing land use changes. The investigation also illuminates the collaborative landscape in the study of land use changes, it demonstrates a predominate pattern of collaboration between authors from developed countries and highlights the potential for increased interaction with scholars from developing countries. Additionally, the research identifies a concentration of investigations in areas like China, Indonesia, the U.S., and some European countries, this suggests that there are potential gaps in the distribution of research that need to be further explored. Additionally, the article highlights the value of ongoing research in areas like regional and city planning, urbanization dynamics, and population trends regarding land use alteration. Through the analysis of influential writers, the study identifies the core journals, and the most popular keywords, the study provides important information about the evolution of land use change research and its significance to environmental sustainability. Keywords: land use- land use change- spatial dynamics Share Link | Plain Format | Corresponding Author (Dian Hudawan Santoso)

92	Engineering	ABS-133
A Review: Transport Phenomena in Metal Powders Processings Hendy Roesma Wardhana, Mansyur Abdul Shaleh, Imam Prasetyo, Meirinda Anggrita Sari, Annida Justisia Mafruhah, Muhammad Ichsan, Naufal Fajar Gumati, Dwi Putra Prihandoyo Department of Metallurgical Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional Veteran Yogyakarta Abstract The era of Additive Manufacturing (AM) is a solution and also as a challenge for the manufacturing industry in the future. The development of upstream industries in terms of mineral and raw material processing need aware for following AM era. The demand for minerals as raw materials are predicted to increase to fulfil the market. However, the mitigation in the form of metal recycling is a key to prepare the AM era considering that mineral resources are limited in nature. Based on the latest technological developments, additive manufacturing by utilizing secondary resources is an interesting topic to develop. This review paper was conducted to provide a review of the metal atomization process as an additive manufacturing material from various feedstock materials. The discussion of the atomization process is carried out by comparing three methods, such as gas atomization, centrifugal atomization, and high remelting spheroidization. The conclusions of ideas consider the characteristics of the method, the operating process, and the powder morphology results. Keywords: Additive manufacturing, metal recycling, atomization process. Share Link | Plain Format | Corresponding Author (Hendy Roesma Wardhana)

93	Engineering	ABS-134
Challenges and Opportunities in the Recent DevelopmentsAluminium-Based Metal Matrix Composites: A Comprehensive Review Atik Setyani, Hendy Roesma Wardhana, Yuliawati, Andika Septian Niko Saputra, Sudaryanto Department of Metallurgical Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional Veteran Yogyakarta Abstract The development of aluminium metal matrix composites (AMMCs) has seen significant advancements in recent decades. This progress has been driven by industry demands for lighter yet stronger materials. This article provides a comprehensive review of the challenges and opportunities in the recent developments of AMMCs, covering methods, applications, and general testing. The main challenges in the fabrication of AMMCs include manufacturing processes, control of reinforcement particle distribution, wettability control of aluminium, microstructural homogeneity, selection of efficient and economical methods, and issues related to corrosion and wear resistance. The agglomeration of reinforcements due to the low wettability of aluminium remains a major issue in AMMCs, leading to poor mechanical properties and accelerated corrosion. On the other hand, technological advancements in nanocomposites, additive manufacturing techniques, and modern casting methods such as stir casting have opened new opportunities to enhance the performance and applications of AMMCs across various sectors, including defense, automotive, aerospace, and construction industries. This review aims to provide insights for researchers and practitioners in the development of AMMC materials, offering perspectives on overcoming existing challenges and leveraging emerging opportunities for further innovation Keywords: Alumunium metal matrix composite, challenges, method, aglomeration Share Link | Plain Format | Corresponding Author (Atik Setyani)

94	Engineering	ABS-136
Kinetic Study of Humic Acid Extraction from Oxidized Low Rank Coal: Shrinking Core Model Daniel Timotius*, Alit Istiani, Aldian Fahrialam, Hatta Muzaffar Arifin, Annisa Rizky Ramadhanty, Aditya Kurniawan, Himawan Tri Bayu Murti Petrus, Ferian Anggara,Yuni Kusumastuti, Mochammad Prahastomi Chemical Engineering Department, Faculty of Industrial Engineering, Universitas Pembangunan Nasional Veteran Yogyakarta, Jl. SWK 104, Yogyakarta 55283, Indonesia Chemical Engineering Department, Faculty of Engineering, Universitas Gadjah Mada, Jl Grafika 2 Yogyakarta 55281, Indonesia Department of Geological Engineering, Gadjah Mada University, Jl Grafika 2 Yogyakarta 55281, Indonesia Department of Geological Engineering, Universitas Pembangunan Nasional Veteran Yogyakarta, Jl. SWK 104, Yogyakarta 55283, Indonesia Abstract Humic acid is a complex mixture of partially decomposed organic materials found in soil, peat, and coal, known for its high molecular weight and heterogeneous composition. It plays a crucial role in soil fertility and plant growth by improving soil structure, enhancing nutrient availability, and aiding in water retention. In the current study, humic acid is extracted from oxidized low-rank coal. The oxidation and extraction are conducted using H2O2 and KOH solution, respectively. The kinetics is evaluated using shrinking core model. The shrinking core model in solid-liquid extraction describes a process where a solid particle reacts with a liquid, causing the reaction to progress inward from the outer surface, forming a shrinking unreacted core of solid. As the reaction proceeds, the reacted layer of the solid dissolves or diffuses into the liquid, while the unreacted core becomes progressively smaller until it is completely consumed. The result shows that the kinetics follow ash diffusion model. The obtained Activation energy and Arrhenius constant are 25.87 kJ/mol/K and 6.91 min-1. Keywords: Extraction, humic acid, kinetics, shrinking core model Share Link | Plain Format | Corresponding Author (Daniel Timotius)

95	Engineering	ABS-137
A Comprehensive Review of Machine Learning Methods for Sentiment and Emotion Categorization in Indonesian Social Media Nur Heri Cahyana(a), Yuli Fauziah(a*), Rochmat Husaini(a), Wisnalmawati(b), Tri Mardiana(b) (a) Informatics Engineering Department, Faculty of Industrial Engineering, Universitas Pembangunan Nasional Veteran Yogyakarta Jalan Babarsari 2 Tambak bayan Yogyakarta (b) Faculty of Economic and Bussiness Abstract Keywords: Sentiment Analysis, Machine Learning, Social Media Share Link | Plain Format | Corresponding Author (Yuli Fauziah)

96	Engineering	ABS-140
Comparison of Hydrochloric Acid (HCl) and Nitric Acid (HNO3) Usage in the Leaching Process and Silica Extraction from Fly Ash Uli Ulfa, Husna Muizzati Shabrina, Perwitasari, Heni Anggorowati, Gabriela Michelle Valentcia, Fadhlyatul Bella Nursiva Universitas Pembangunan Nasional Veteran Yogyakarta Abstract Waste from coal-burning power stations and other sectors that rely on coal as a source of energy is one of the environmental issues. Subsequently, a great deal of study was conducted on the application of flying ashes coal. Among the techniques for making use of the Flying Ashes of Coal is the extraction of silica. This study carried out the comparison in the usage of Acid solvent (HCl and HNO3) in the leaching process and silica extraction from fly ash with various temperature (30, 45,60,75, and 90 C) and time (1 and 2 hours). The highest percentage of leached solid was obtained at 42.15% using HCl solvent at 90 C for 2 hours. Meanwhile, the percentage of extracted silica obtained was 8% Keywords: Fly ash, Silica, HCl, HNO3, Extraction Share Link | Plain Format | Corresponding Author (Perwitasari Perwitasari)

97	Engineering	ABS-152
The effect of Alkali and salt water solution on mechanical and morphological properties of Musa fibers Mochamad Mussodaq, Sri Anom Amongjati, Imam Prabowo UPN Veteran Yogyakarta Abstract These days, environmental issues are a big concern and require attention, particularly in developing nations with dense populations like Indonesia where soil pollution from inorganic waste-that is, garbage that does not break down-is a major issue. The utilization of inorganic fibers like carbon and glass fiber is one of the reasons behind issues with soil pollution. Because glass fiber cannot naturally break down in the environment, using non-environmentally friendly materials in industry will have a negative impact on the environment. This study aims to use natural fibers, such musa fiber, to lessen environmental pollution. This is because it may break down naturally, reducing the amount of glass fiber or carbon fiber trash that cannot break down. The compatibility of fiber with other materials must be established before it can be utilized in its intended application. Alkalinization with NaOH and salt water treatment are two possible methods. Musa fibers were chemically treated by dipping them for five hours into a solution of NaOH alkaline compounds as well as salt water at concentrations of 5 and 10 M. Following the chemical treatments, the mechanical and microstructure characteristics of the abaca banana fibers were assessed using ASTM D 3379 and an optical microscope, respectively. Keywords: salt water treatment, Alkalization, Musa, mechanical properties Share Link | Plain Format | Corresponding Author (mochamad mussoddaq)

98	Engineering	ABS-155
Study of Slope Stability Using Seismic Refraction Method in Hilly Terrain of Dlingo, Bantul, Yogyakarta Rahmawati Fitrianingtyas (1*), Eko Wibowo (1), Thema Arrisaldi (2), Muhammad Fadeli Saputra (1), Yustisio Dianwiyono (1) 1) Geophysical Engineering Department, Faculty of Mineral Technology, UPN Veteran Yogyakarta, No.104, Condong Catur, Sleman, Daerah Istimewa Yogyakarta, 55281 2) Department of Geological Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta, Jl. Padjajaran, Sleman, Yogyakarta, 55283, Indonesia *rahmawati.fitrianingtyas[at]upnyk.ac.id Abstract This research aims to identify slope stability in hilly terrain based on subsurface formation using refraction seismic method. Measurements were taken at two locations using 24 geophones spaced 2 meters apart, resulting in a total line span of 48 meters at each location. The seismic refraction data processing techniques used in this study is time-term method. This methods was used to analyse the time-distance curve to obtain the velocity model. Based on the velocity distribution of the subsurface seismic waves, there are two distinct layers. The upper layer has a velocity of about 300 m/s, interpreted as unconsolidated soil, which is loose rock that are less dense. The lower layer, with a velocity of 800 m/s - 1764 m/s, is identified as denser rock such as andesite breccia. The upper layer with low velocity indicates a weak zone that is vulnerable to landslides, especially if triggered by heavy rainfall or seismic activity. Keywords: Slope stability- Landslide- Seismic- Refraction- Yogyakarta Share Link | Plain Format | Corresponding Author (Rahmawati Fitrianingtyas)

99	Engineering	ABS-156
Hydrogeochemical Characteristics, Sources and Human Health Risk Assessment of Heavy Metal Dispersion in Malifut, North Halmahera Peter Eka Rosadi (a*), Ilham Firmansyah (a), Hasywir Thaib Siri (a), Ayu Utami (b), Susanti Rina Nugraheni (c) a) Department of Mining Engineering, Faculty of Mineral and Energy Technology, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta, Jl. Padjajaran 104, Daerah Istimewa Yogyakarta 55283, Indonesia *peterekarosadi[at]upnyk.ac.id b) Department of Environmental Engineering, Faculty of Mineral and Energy Technology, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta, Jl. Padjajaran 104, Daerah Istimewa Yogyakarta 55283, Indonesia c) Department of Chemical Engineering, Faculty of Industrial Technology, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta, Jl. Padjajaran 104, Daerah Istimewa Yogyakarta 55283, Indonesia Abstract This study collected water samples for hydrogeochemical analysis, assessing heavy metal concentrations and potential health risks through exposure assessments and hazard quotients in Malifut, North Halmahera, which can be contaminated by volcanic activity and gold mining activity. The result revealed a range of pH levels and various types of water affected by rock interactions. The Water Hazard Index showed value range from 0.075 to 10.38 varying levels of toxicity, implying minimal to extreme toxicity of the water. Based on the results of the Risk Assessment, the calculated Hazard Index values indicate lower levels (<1) in surface water and (>1) for underground water, as well as low Carcinogenic Risk in surface river water and middle for underground water. Therefore, these results suggest that the contamination levels in the area are still within safe limits for various water uses. Regular monitoring and management of water quality must be conducted periodically. Keywords: Groundwater, risk assessment, hydrogeochemical Share Link | Plain Format | Corresponding Author (Peter Eka Rosadi)

100	Engineering	ABS-157
An Investigation of Aquifer Potential in Karst Area Using Geoelectric Approch with Schlumberger Configuration: A Case Study of Gunungkidul, Yogyakarta, Indonesia Eko Wibowo (1), Rahmawati Fitrianingtyas (1*), Riska Aprilia Triyadi (2), Haris Muhlisin (1) 1) Geophysical Engineering Department, Faculty of Mineral Technology, UPN Veteran Yogyakarta, No.104, Condong Catur, Sleman, Daerah Istimewa Yogyakarta, 552811 *rahmawati.fitrianingtyas[at]upnyk.ac.id 2) Environmental Engineering Department, Faculty of Mineral Technology, UPN Veteran Yogyakarta, No.104, Condong Catur, Sleman, Daerah Istimewa Yogyakarta, 552812 Abstract This study investigates aquifer potential in the karst area of Gunungkidul using the Schlumberger configuration of geoelectrical method. Measurements were conducted at 6 points along a path measuring 420 metres in length. The inversion technique was employed for the analysis of the data, with the objective of mapping the subsurface resistivity. The findings reveal significant variations in resistivity values, indicating the predominance of massive limestone with high resistivity across several soundings. Low resistivity patterns suggest the presence of perched aquifer, particularly at 12 meters in the second sounding, 13 meters in the third sounding, and 95,8 meters in the sixth sounding. However, the overall analysis indicates no distinct resistivity patterns indicating large-scale aquifers suitable for extensive utilization. These results underscore the complexity of aquifer distribution in karst landscapes, emphasizing the need for further research to enhance water resource management and sustainable development in the region. Keywords: Hydrogeology- Karst- Aquifer- Geoelectric- Schlumberger Share Link | Plain Format | Corresponding Author (Rahmawati Fitrianingtyas)

101	Engineering	ABS-158
Assessment of The Impact of Oil Pollution on Changes in Soil Physical Properties in The Old Oil Well Area of Wonocolo Village Agus Bambang Irawan, Herwin Lukito, Aditya Pandu W, R Agus Widodo, Fauzan Irfandy Universitas Pembangunan Nasional Veteran Yogyakarta Abstract Petroleum contamination of soil in the old petroleum well area of Wonocolo Village continues to occur along with petroleum mining activities by the people. This affects soil health, especially the parameters of soil physical properties. This study aims to assess the level of petroleum pollution in soil and its impact on changes in soil physical properties in the old petroleum well area of Wonocolo Village. The methods were field survey and laboratory analysis of TPH values of produced water, petroleum sludge, soil and soil texture and porosity parameters. The relationship of petroleum polluted soil to soil texture and porosity was analysed descriptively qualitatively. The results showed that the largest source of soil pollution came from the discharge of formation water into the surrounding environment. The largest petroleum pollution in the soil occurred at the steep slope location of 93,000 mg/kg, while the smallest petroleum pollution occurred at the location with a gentle slope of 53,00 mg/kg. The impact of petroleum pollution causes a decrease in soil porosity and changes in soil texture. Keywords: pollution, TPH, texture, porosity Share Link | Plain Format | Corresponding Author (Agus Bambang Irawan)

102	Engineering	ABS-159
The Effect of Using Chicken Egg Shell Waste as a Lime Mixture on pH Parameters in Acid Mine Water Kristanto Jiwo Saputro (1), Heru Suharyadi (1), Yusmardhany Yusuf (2), Bagoes Nur Muhammad (1), Nur Reza Muhammad Yusuf (1), Hanif Khalilullah (1), Sindi Mutika Sari (1) (1) Department of Mining Engineering , (2) Chemical Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional Veteran Yogyakarta, Abstract Mining using the open pit method involves water, oxygen and sulfide minerals, which have the potential to produce acid mine drainage. Acid mine drainage has a low pH, namely less than 4. This pH value is less than the environmental quality standard based on Ministerial Decree of the Minister of Environment Number. 113 of 2003 concerning Waste Water Quality Standards for Coal Mining Businesses and Activities. Therefore, neutralizing acid mine drainage is a necessity. One of the methods applied is the active method, namely by administering lime. Based on research by Anthony M. Muliwa (2018) regarding the evaluation of the performance of egg shell waste materials for remediation of acid mine water from coal disposal leachate, it was concluded that egg shells can be used as an alternative material to neutralize acid water but are still less effective. This research will simulate the effectiveness of egg shells using the quicklime mixing method in neutralizing acid mine drainage so that the correct mixing dose is obtained to neutralize acid mine drainage. Keywords: Acid mine drainage, egg shell Share Link | Plain Format | Corresponding Author (Kristanto Jiwo Saputro)

103	Engineering	ABS-163
Optimization of Moringa Seed Powder as a Disinfectant for Reducing E. Coli in Water at Kalurahan Kelor,Kapanewon Karangmojo, Gunungkidul Bambang Sugiarto, Retno Dwi Nyamiati, Heri Septya Kusuma, Maryana 1Departement of Chemical Engineering,Faculty of industrial Engineering,Universitas Pembangunan Nasional ^Veteran^ Yogyakarta,Indonesia 55283 2Department of Agrotechnology, Faculty of Agriculture, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta,Indonesia 55283 Abstract Kalurahan Kelor is one of the villages located in Gunungkidul, Yogyakarta. The problem faced by the community in Kelor is that during the dry season, the presence of traditional livestock farming leads to an increase in E. coli levels in groundwater, which affects the quality of the community^s drinking water supply. Moringa seeds can be utilized for water purification, specifically to reduce E. coli and Total Dissolved Solids (TDS) in drinking water sources. The dosage of Moringa powder significantly impacts the effectiveness of E. coli and TDS reduction, which also affects the taste, odor, and clarity of the water. This study will explore the method of obtaining Moringa powder by drying Moringa seeds followed by milling them, and then using the powder for water purification. Determining the optimal dosage is crucial to ensure that the taste, odor, and E. coli levels are reduced to meet hygienic standards for water that can be used as a food source. Keywords: Moringa seeds, Drying, Moringa powder, Dosage, Reduction of E. Coli and TDS Share Link | Plain Format | Corresponding Author (Retno Dwi Nyamiati)

104	Engineering	ABS-165
Application of Landsat Imagery for Landslide Hazard Mapping in Gumelar District, Banyumas Regency Daniel Radityo1, Septyo Uji Pratomo1, Nandra Eko Nugroho2, Arnia Fitri1, Dimas Cahya Wicaksana1, Muhammad Raihan Didi Murdana1 1Geological Engineering Department of UPN Veteran Yogyakarta 2Environmental Engineering Department of UPN Veteran Yogyakarta Abstract Landslides are land movements caused by both natural and human-induced factors. Natural factors are influenced by the area^s geological structure, rock type, slope gradient, and rainfall intensity, while human-induced factors are dynamic, such as land use and infrastructure development. Remote sensing techniques using satellite imagery can be applied to map landslide-prone areas. Satellite images are recordings of the earth^s surface of multiple bands with specific wavelengths. These bands are composited to enhance object visibility, simplifying land cover classification. In the case of Gumelar District, Banyumas Regency, the zoning of landslide-prone areas is mapped using a weighting and scoring method. The parameters influencing landslides, including geological structure, rock type, rainfall, slope, infrastructure, and land cover derived from satellite imagery, are weighted and scored. The results indicate that the landslide potential in Gumelar District is predominantly in the moderate to high category. Landslide-prone area mapping is crucial as a mitigation measure to minimize the impact of landslides. Keywords: landslides, satellite imagery, mapping, Gumelar District, ground movement. Share Link | Plain Format | Corresponding Author (Septyo Uji Pratomo)

105	Engineering	ABS-166
Extraction of Keratin Protein from Waste Chicken Feathers: The Effect of NaOH Concentration and Time Sri Wahyu Murni, Tutik Muji Setyoningrum, Herry Sofyan, Alim Nurjanah and Sandika Perdana Putra 1Department of Chemical Engineering, Faculty of Industrial Technology, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta, Indonesia Department of Information Engineering, Faculty of Industrial Technology, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta, Indonesia E-mail address sriwahyumurni[at]upnyk.ac.id Abstract Chicken feathers contains about 4-6% of total weight of chicken are most influential waste by-product from poultry farm and slaughter. Keratin protein is a fibrous protein that primar constituen of featrhers and is used in several application. This present work, protein was extracted from waste chicken feather and then protein powder was produced from drying of protein solution extract. The objective of this research was characterization the protein extract and to study the influence concentration NaOH anf time on yield protein extract. Experimental results on extrcation protein shows that at concentration NaOH was 1,75 N and 90 minute, yiels of crude protein was 94,8%. This is concluded that hydrolytic process can used to produced soluble protein. Caracterization powder protein extract by Fourier-Transform Infrared Spectroscopy (FTIR) shows that the protein extract remained their characteristic as protein. Keywords: protein, chicken feathers, extraction Share Link | Plain Format | Corresponding Author (Sri Wahyu Murni)

106	Engineering	ABS-175
Tracking the (Temporary) Dwellings of Prehistoric Humans in the Bumiayu Area and Surroundings, Brebes Regency, Central Java Ediyanto1, Istiana2, Monica Maharani3, Karyono4, Budi Santosa5, Dhani Firmansyah6 Prodi Teknik Geologi, Jurusan Teknik Geologi, Fakultas Teknologi Mineral UPN Veteran Yogyakarta, Jl. Padjajaran Jl. Ring Road Utara No.104, Ngropoh, Condongcatur, Kec. Depok, Kabupaten Sleman, DIY 55283 1,2, Prodi Teknik Geomatika, Jurusan Teknik Geologi, Fakultas Teknologi Mineral UPN Veteran Yogyakarta, Jl. Babarsari 2, Tambakbayan, Depok, Sleman, DIY 55283 3. Abstract The Bumiayu area and its surroundings in Brebes Regency, Central Java, are very similar to the Sangiran area in Sragen Regency, Central Java, regarding the discovery of vertebrate fossils and prehistoric human fossils. The rock unit (Formation) that contains many vertebrate fossils and prehistoric human fossils in Sangiran is the sandstone unit of the Kabuh Formation. In Bumiayu, the rock unit that contains vertebrate fossils and prehistoric human fossils is the sandstone unit of the Kaliglagah Formation. These two formations have similar lithological characteristics. For archaeologists, they believe that the life and death of vertebrates and prehistoric humans occurred at the site where the fossils were found. For geologists, the life and death of prehistoric humans did not occur at the site where the fossils were found, but they were transported from distant places carried by floods and deposited at the discovery site. This implies that the habitat of vertebrates and prehistoric humans was far from where the fossils were found. The purpose of this research is to track the (temporary) dwellings of prehistoric humans. To determine the source/headwaters of the river that transported and deposited the fossils, it is necessary to know the direction of the ancient currents by measuring the cross-bedded sediment structures present in the sandstone layers/units as a result of large floods. The research results show that the direction of the ancient currents is relatively northwest-southeast. This aligns with the locations of caves that have the potential to be (temporary) dwellings of prehistoric humans. One of the criteria for prehistoric human dwellings is the presence of a small river inside the cave that never dries up. This river exists due to a fault that cuts through the cave. Some caves believed to have the potential to be (temporary) dwellings of prehistoric humans include Lawa Cave in the Larangan area, Brebes, and Srewiti Cave in the Ajibarang area. Keywords: limestone cave, cross-bedded, (temporary) dwellings of prehistoric humans Share Link | Plain Format | Corresponding Author (Istiana Istiana)

107	Engineering	ABS-176
Enhancing Crude Oil Inventory Management: A Modified Wagner-Whitin Algorithm Approach Considering Storage Tank Capacity Constraint Nur Indrianti (a*), Raden Achmad Chairdino Leuveano (a), Salwa Hanim Abdul-Rashid (b), Andreas Mahendro Kuncoro (a), Yuli Liestyana (c) (a) Industrial Engineering Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Jalan Babarsari 2, Tambakbayan, Daerah Istimewa Yogyakarta 55281, Indonesia *n.indrianti[at]upnyk.ac.id (b) Centre of Product Design and Manufacturing, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia (c) Management Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Jalan Padjajaran No.104, Condongcatur, Daerah Istimewa Yogyakarta 55283, Indonesia Abstract Crude oil inventory control is a critical aspect of the operational management of the oil and gas industry. Fluctuating demand, high price volatility, supply uncertainty, and storage tank capacity can increase the complexity of crude oil inventory management. This study aims to develop a modified Wagner-Whitin algorithm (WWA) that considers storage tank capacity constraints in the context of crude oil inventory management. The problem of controlling crude oil raw material inventory from an oil refinery unit in Indonesia was used as a case study. Model validation was carried out by comparing the calculation results of the modified WWA with the calculation results of other inventory models, including Periodic Order Quantity, Silver-Meal Algorithm, Least Unit Cost, Part Period Algorithm (PPA), and Incremental PPA. The validation results show that the modified WWA provides the smallest variable inventory costs. It is concluded that the modified WWA has the potential to improve operational efficiency and substantially reduce inventory costs in the oil and gas industry. Keywords: inventory management, crude oil, Wagner-Whitin algorithm, capacity constraint Share Link | Plain Format | Corresponding Author (Nur Indrianti)

108	Engineering	ABS-177
Application of Linear Predictive Code (LPC) Feature Extraction for Reading Arabic Numbers with Support Vector Machine (SVM) Heriyanto, Budi Suyanto, Tunjung Wahyu Widayati UNIVERSITAS PEMBANGUNAN NASIONAL VETERAN YOGYAKARTA Abstract The pronunciation of the Arabic language is related to checking the suitability of the reading of the Arabic numerals numbers one to ten which are often read by Muslims. This research consists of three stages. The first stage, extraction of reading sound characteristics using Linear Predictive Code (LPC). The second stage is selecting the features that will be used as a feature table. The third stage is testing by checking the suitability of the reading of Arabic numbers applied in the recitation at the Nurul Huda Mosque. Testing checks the suitability of selecting the right features to the number of cepstral coefficients and frames. The features from LPC extraction are in the form of frame features and the average cepstral coefficient in each feature frame is directly checked with the reader with a reference. Research on the sound of reading Arabic numbers as well as feature extraction, feature selection, and checking the suitability of readings in application using LPC feature extraction at the Nurul Huda Mosque reached 85% with Support Vector Machine (SVM). Keywords: suitability, cepstral coefficient, frame, features, reference Share Link | Plain Format | Corresponding Author (HERIYANTO heriyanto)

109	Engineering	ABS-178
DEVELOPMENT OF SIDS (SCHEDULE INFORMATION DISPLAY SYSTEM) INFORMATICS PROGRAM LECTURES UPN ^VETERAN^ YOGYAKARTA Heriyanto, Novrido Charibaldi, Hari Prapcoyo, Frans Richard Kodong UNIVERSITAS PEMBANGUNAN NASIONAL VETERAN YOGYAKARTA Abstract The development of information technology makes a system practical, effective and efficient. One of the impacts is the ease of creating a scheduling information system in higher education. This research is a system design model which aims to develop a website-based scheduling information system displayed in the form of SIDS (Schedule Information Display System) with Wide Screen TV Technology to improve the effectiveness of lecturer performance and the learning process at UPN ^Veteran Informatics ^ Yogyakarta. SIDS was developed using the software development life cycle with a Prototype approach, where the prototype model was chosen because it makes it easier to design the SIDS appearance. The development of SIDS can improve the performance of the learning system involving lecturers, students and administrators in the Informatics Department. Keywords: display, design, management, scheduling, learning Share Link | Plain Format | Corresponding Author (HERIYANTO heriyanto)

110	Engineering	ABS-184
Comparison of effectiveness of rice husk ash and polyaluminum chloride in coagulation of palm oil mill effluent Indriana Lestari, Dwi Amalia, Jeremia Bernadin Perangin Angin, Muhammad Haekal Zenatik Department of Chemical Engineering, Faculty of Industrial Engineering, Indonesia, Universitas Pembangunan Nasional Vetern Yogyakarta Abstract This study aimed to evaluate the effectiveness of Rice Husk Ash (RHA) and polyaluminium chloride (PAC) as coagulants for removing Total Solids (TS) from POME. The study focused on coagulant dosage and settling time as key process parameters. Using RHA, the treatment achieved up to 47,27% TS removal under optimal conditions, which were 6.5 g of RHA and a 60-minute settling time. Similarly, PAC showed slightly better performance with a removal efficiency of 58,93% for total solids at an optimal dosage of 6.5 g and a 60-minute settling time. The results suggest that RHA could be a cost-effective alternative for PAC to treat POME. In addition, the SEM-EDX characterization results showed that the resulting RHA was amorphous with a silica content of 13.7%. Keywords: Coagulation, Palm Oil Mill Effluent, Rice Husk Ash, polyaluminum chloride Share Link | Plain Format | Corresponding Author (Dwi Amalia)

111	Engineering	ABS-186
Characteristics of Leachate and Its impact on River Water Quality (Case Study: Tanjungrejo Landfill Jekulo District, Kudus Regency, Central Java Province) Tissia Ayu Algary, Titi Tiara Anasstasia, Arika Bagus Perdana, Agus Bambang Irawan, Ziyaadatus Sayyidatur Rohmah, Anwar Rusydi, Farhan Mahbudin Lathif Universitas Pembangunan Nasional Veteran Yogyakarta Abstract The Tanjungrejo landfill site, covering an area of approximately 5.6 hectares, is located in Jekulo District, Kudus Regency, Central Java Province. This landfill employs a open dumping semi controlled landfill method for waste management which has led to several environmental issues, one of which is leachate problems. This study aims to assess how the characteristics of leachate from the landfill affect the quality of the Pigi river water. The methods used in this study include purposive sampling for collecting water samples of the river water and leachate samples and laboratory analysis to test the river water quality and leachate samples for parameters such as COD, BOD, and heavy metals. From the analysis of the sample data in this study, it can be concluded that the quality of leachate discharged from the IPL outlet into the river still exceeds the quality standard for the COD parameter, which is 9.225 mg/L. The leachate from Tanjungrejo landfill tends to be non-biodegradable, as indicated by a BOD/COD ratio of < 0.1. The discharged of leachate from the IPL into the river affects the river water quality status to moderately polluted. An evaluation of improvements for the IPL treatment is needed, focusing on reducing COD and Fe levels in leachate by added particularly non-biological treatment, in order to contribute to the enhancement of the Pigi River^s water quality status as the receiving surface water body for the leachate. Keywords: landfill, leachate, waste management Share Link | Plain Format | Corresponding Author (Tissia Ayu Algary)

112	Engineering	ABS-187
REDUCTION OF POLLUTANTS IN CHEMICAL WASTEWATER USING A COMBINATION OF ELECTROCOAGULATION AND PNEUMATIC AGITATION RR Dina Asrifah*, Aditya Pandu Wicaksono, Renung Reningtyas, Dewa Guritno, Ryhoma Sevin, Ghina Zhabrina, Alya Talitha Universitas Pembangunan Nasional Veteran Yogyakarta Abstract Laboratory activities involve the use of various chemical substances, both metallic and non-metallic, some of which are classified as hazardous and non-hazardous (non-B3). Used chemicals, whether hazardous or non-hazardous, can become waste that potentially endangers the environment and human health if not properly handled or treated. The management of waste from laboratory activities is still limited, often resulting in the storage of liquid waste in warehouses. Existing treatment methods include coagulation, flocculation, adsorption, electrocoagulation, filtration, and neutralization. In this study, the electrocoagulation method combined with pneumatic agitation is used. The purpose of the research was to enhance the effectiveness of chemical wastewater treatment, such combination of electrocoagulation with pneumatic agitation. The evaluation is based on two factors: the amount of coagulant used and variations in pH. The pollutant parameters tested include TDS (Total Dissolved Solids), TSS (Total Suspended Solids), turbidity, pH, salinity, Pb (lead), and COD (Chemical Oxygen Demand). The results indicated increasing the coagulant dose affects reducing turbidity, TSS, Pb, and COD. Increasing the coagulant dose does not affect reducing TDS and salinity. Increasing waste pH affects reducing turbidity, Pb, and COD. Increasing pH does not have a significant effect on reducing TSS, TDS, and salinity. Keywords: Chemical wastewater, Electrocoagulation, Pneumatic Agitation Share Link | Plain Format | Corresponding Author (RR Dina Asrifah)

113	Engineering	ABS-188
Characterization of Al2O3 Nanoparticles from AlCl3 with Syzygium aromaticum L. Leaf Solid Waste Extracts as Bioreductor Inassya Kraznaya Svezda, Wigo Sumahar, Indriana Lestari, Yuli Ristianingsih Chemical Engineering, Universitas Pembangunan Nasional Veteran Yogyakarta- Environtmental Engineering Universitas Pembangunan Nasional Veteran Yogyakarta Abstract This study aims to present the findings from characterizing the green synthesis of Al2O3 nanoparticles using Syzygium aromaticum L leaf solid waste extract as a bioreductor. The functional groups of the Al2O3 nanoparticles were examined through Fourier transform infrared (FTIR) spectroscopy. FTIR analysis showed that Al2O3 is characterized by (AlO)-OH bonds at 539,5 cm-1 and Al-O Vibration at 762 cm-1. Other bonds, such as O-H, indicating the presence of intramolecular hydrogen bonds, were observed at wavelength 3395,43 cm-1. Additionally, our results showed that the pseudo-first-order model for methylene blue adsorption offered the best fit of the experimental data. Keywords: Green synthesis, Al2O3 nanoparticles, bioreductor, Fourier transform infrared, waste Share Link | Plain Format | Corresponding Author (Indriana Lestari)

114	Engineering	ABS-190
Low-Cost Geoelectric Equipment: Design and Development of a Voltage Measurement System Suharsono, Wahyu Hidayat, Heru Suharyadi, Yudha Agung Pratama Geophysical Engineering Department, Faculty of Mineral Technology and Energy, UPN Veteran Yogyakarta Mining Engineering Department, Faculty of Mineral Technology and Energy, UPN Veteran Yogyakarta Abstract The measurements were performed using a KA3005D digital power supply capable of ranging from 0.01 to 30 volts. This power supply provided a reliable and adjustable source of voltage for the experiments. A Fluke 116 multimeter was used as the reference instrument, ensuring accurate and precise voltage measurements. Additionally, an ADS1256 analog-to-digital converter system was utilized to collect the data, allowing for digital capture and storage of the voltage readings. This research aims to develop cost-effective geophysical equipment that retains a high degree of measurement precision. The results, averaged and analyzed for standard deviation, showed a linear relationship between the reference value (x) and measured value (y) as ( y = 1.0071x - 0.0032 ), indicating high accuracy with a slight offset. The standard deviation, described by ( y = 0.0002x + 0.011), increased slightly with higher reference values, suggesting growing measurement uncertainty. Systematic error and relative error were analyzed, revealing linear and sub-linear patterns respectively. The system^s accuracy is generally satisfactory but requires improvements for low voltages (<5V) and higher precision for elevated measurement voltages. The microcontroller-based voltage measurement system with auto-ranging and a 24-bit ADC offers reliable and accurate measurements Keywords: ADS1256, Voltage Measurement, Geolectric Share Link | Plain Format | Corresponding Author (Suharsono Suharsono)

115	Engineering	ABS-193
Comparative Study of Landsat 8 Multispectral Analysis and Mineralogical Characterization of Iron Sands from the Coast of Kulon Progo, Yogyakarta Setia Pambudi, Sutarto, Maulana Yudinugroho, Frideni Yushandiana Putri Green Field, Abdullah Khafid Maruf, Naufal Aditya Putra, Maulidiya Fathien Hamidah Geological Engineering Department, Universitas Pembangunan Nasional Veteran Yogyakarta Abstract This study presents a comparative analysis between multispectral analysis using Landsat 8 data and mineralogical analysis of iron sands from the coast of Kulon Progo, Yogyakarta. The multispectral analysis distinguished three different iron minerals: ferric oxide, ferrous oxide, and hydroxyl minerals. Eight iron sand samples were analyzed using Landsat 8 data, combining band index and density slicing to effectively identify iron oxide mineral characteristics. The mineralogical analysis was conducted through grain counting using a binocular microscope. The results show that samples from areas with ferrous iron are dominated by magnetite. In contrast, samples from ferric iron areas are dominated by a combination of magnetite and hematite, with these areas typically kept moist due to sea currents. The hydroxyl mineral areas are characterized by the presence of magnetite, hematite, and some hydroxyl minerals such as goethite and clay minerals. This study highlights the effectiveness of combining multispectral and mineralogical analyses for detailed characterization of iron sands. The findings provide valuable insights into the distribution and composition of iron minerals in coastal regions, which can be crucial for environmental and geological studies. The use of Landsat 8 data and binocular microscope analysis demonstrates a robust method for identifying and quantifying different iron minerals in complex geological settings. Keywords: Landsat 8, Multispectral Analysis, Mineralogy, Iron Sands, Ferric Oxide, Ferrous Oxide, Hydroxyl Minerals Share Link | Plain Format | Corresponding Author (Setia Pambudi)

116	Engineering	ABS-201
Geological structure modeling derived from gravity data at the Purwodadi mud volcano complex, Central Java, Indonesia Ardian Novianto, Wahyu Hidayat, Bambang Bintarto, Ghiffari Aulia Adzli Sadi Utomo, Muhammad Asslam Ridho Geophysical Engineering Department, Faculty of Mineral and Energy Technology, UPN Veteran Yogyakarta, Yogyakarta, Indonesia Petroleum Engineering Department, Faculty of Mineral and Energy Technology, UPN Veteran Yogyakarta, Yogyakarta, Indonesia Abstract We present a subsurface geological model of the Purwodadi mud volcano complex. This study focuses on understanding the structural development and tectonic evolution to provide insights into the occurrence and formation of mud volcanoes within the Purwodadi region. By analyzing the subsurface geological structure and density variations using gravity data, the study aims to elucidate the underlying factors and processes that have shaped the Purwodadi mud volcano complex. The analysis of the subsurface structure is informed by Euler deconvolution techniques and 2.5-dimensional gravity modeling. The data used in this study is high-resolution gravity data collected across the Purwodadi mud volcano complex in Central Java, Indonesia. This high-quality gravity data provides detailed information about the subsurface geological structure and density variations within the study area. The 2.5D gravity model suggests two distinct tectonic episodes that have shaped the geological structure of the Purwodadi mud volcano complex. Initially, a strain phase led to the formation of syn-rift deposits, as the region underwent extensional tectonics. This was then followed by a compressional tectonic regime, which generated thrust faults and the development of a fold-thrust belt system. These two dominant fault systems exhibit a predominantly west-east orientation, reflecting the overall tectonic evolution of the study area. Keywords: Mud volcano, Gravity, Deconvolution Euler, Fold thrust belt. Share Link | Plain Format | Corresponding Author (Suharsono Suharsono)

117	Engineering	ABS-203
Analysis of Sensitivity to Parameters Affecting Hydraulic Conductivity Values in Fractured Media Tedy Agung Cahyadi, Faizal Agung Riyadi, Dymas Albert Nasrulah Arifaini, Thema Arrisaldi, Maulana Nafid Hakim Universitas Pembangunan Nasional Veteran Yogyakarta Abstract Hydrogeological modeling requires identifications of groundwater characteristics, particularly the hydraulic conductivity (K) value. Typically, a rock layer is assumed to be homogeneous with a predetermined K value, although in reality, this value can vary. Fractured rocks exhibit a higher degree of heterogeneity and complexity compared to sedimentary rocks. Sensitivity analysis is needed to assess the significance of contributing parameters towards the K value. K estimation uses geotechnical data such as Rock Quality Designation (RQD), joint spacing, joint separation, and lithology type from borehole cores. Regression analysis, correlation, coefficient of determination, and Standard Error of Estimate (SEE) are performed on these four parameters. Results show that joint separation has a correlation coefficient of -0.73 and a determination coefficient of 0.53, indicating the greatest influence. The lithology permeability index has the least influence, with a correlation coefficient of 0.27 and a determination coefficient of 0.07. Keywords: regression, sensitivity analysis, RQD, joint, separation, spacing, lithology Share Link | Plain Format | Corresponding Author (Faizal Agung Riyadi)

118	Engineering	ABS-205
laboratory test on stability of current and potential values using resistivity-meter controlled by Arduino microcontroller Hafiz Hamdalah (a*) , Wrego Seno Giamboro (a), Agris Setiawan (b), Yudha Agung Pratama (a) , Aldino Putra Anwar (a), Erika Ditya Safitri (a), Sunu Subekti (a) a) Geophysical Engineering Department, Faculty of Mineral Technology, Universitas Pembangunan Nasional Veteran Yogyakarta Jalan Padjajaran N0. 104, Condongcatur, Sleman, Yogyakarta *hafizhamdalah[at]upnyk.ac.id b) Geomatics Engineering Department, Faculty of Mineral Technology, Universitas Pembangunan Nasional Veteran Yogyakarta Jalan Padjajaran N0. 104, Condongcatur, Sleman, Yogyakarta Abstract Accuration of subsurface rock resistivity measurement is most important in geoelectrical exploration. One of factors is stability of current and potential measurement by the resistivity-meter. Resistivity-meter with manual system often results in unstable readings of current and potential values. This research tries to build resistivity-meter with automatic system based on Arduino microcontroller. This system to help speed up of data collection and stability of current and electric potential measurement caused by differences medium at subsurface. Based on laboratory tests with a circuit made to resemble measurements in the field, where the target resistance (R1) and surface soil resistance (R2) and C1 and C2 are the current. R1 varies from resistor 0.22, 0.5, 1, 5, 20, 100, 470, 2000 Ohm and R2 varies from 50, 100, 470, 1000, 2000, 3000, and 5000 ohm, to maintain performance and increase the temperature of resistor monitored using thermometer. The measurement results show the stability of the resistivity-meter readings with a microcontroller system with an average error of under 5% for current, potential and resistance parameters with various variations in R1 and R2 measurements, so it can be concluded that this tool is ready to carry out measurements on field scale. Keywords: Resistivitymeter- Arduino Microcontroller- Resistivity- geoelectrical Share Link | Plain Format | Corresponding Author (Hafiz Hamdalah)

119	Engineering	ABS-206
Visual Transformation to Enhance the Appeal of the Mining Technology Journal Website: A Case Study on User-Oriented Design Nurkhamim, Rika Ernawati, Shofa Rijalul Haq, Faizal Agung Riyadi, Heru Suharyadi Universitas Pembangunan Nasional Veteran Yogyakarta Abstract To support Indonesia^s Higher Education program, the Master^s Program in Mining Engineering at Universitas Pembangunan Nasional Veteran Yogyakarta emphasizes the importance of scientific journals. This proposal aims to enhance the Mining Technology Journal website by focusing on visual aspects to increase user appeal. Continuous improvement, development, and maintenance are essential for achieving national accreditation. The approach involves literature reviews, field studies, and electronic data collection, which will be integrated into the online system. Additionally, the research will analyze user interface (UI) and user experience (UX) design when accessing the website. The expected outcome is a comprehensive scientific journal management system that enables the Mining Technology Journal to be published regularly and continuously while obtaining national accreditation. Keywords: Website, Mining Technology Journal, Visual Share Link | Plain Format | Corresponding Author (Faizal Agung Riyadi)

120	Engineering	ABS-209
Designing Woven Patterns with Generative Adversarial Networks: A Comprehensive Survey Andiko Putro Suryotomo (a*), Bagus Muhammad Akbar (a), Dhimas Arief Dharmawan (a), Nur Indrianti (b), Anindia Az-Zahra (a), Sayang Sani (a), Devina Azzahra (b) a) Department of Informatics, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta Jl. Tambak Bayan No.2, Janti, Caturtunggal, Kec. Depok, Kabupaten Sleman, Daerah Istimewa Yogyakarta 55281, Indonesia *andiko.ps[at]upnyk.ac.id b) Department of Industrial Engineering, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta Jl. Tambak Bayan No.2, Janti, Caturtunggal, Kec. Depok, Kabupaten Sleman, Daerah Istimewa Yogyakarta 55281, Indonesia Abstract This paper investigates the use of Generative Adversarial Networks (GANs) in designing woven textile patterns, focusing on enhancing creativity and cultural relevance. It examines existing methods like StyleGAN and SinGAN, identifying limitations in generating diverse and emotionally resonant designs. Through experiments with the Ulos motif-a traditional textile from the Batak tribe-this study demonstrates the effectiveness of improved StyleGAN techniques in producing high-quality, varied motifs. The research emphasizes the need to integrate human creativity into GAN-driven processes to avoid homogenization and maintain cultural significance. It also addresses future challenges, including the need for more diverse datasets and ethical considerations in AI-generated design. This work contributes to the understanding of how GANs can be used to balance technical innovation with cultural and emotional depth in textile design. Keywords: AI-Driven Creativity, Cultural Relevance, Generative Adversarial Networks (GANs), Woven Textile Design Share Link | Plain Format | Corresponding Author (Dhimas Arief Dharmawan)

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