Page 4 (data 91 to 120 of 171) | Displayed ini 30 data/page
<< PREV 1 2 3 4 5 6 NEXT >>

91	Chemistry	ABS-154
Assessment of macronutrient dynamics in a tropical watershed: A study from Bengkulu River and Estuary Indonesia Wiwit (a*), Idha Yulia Ikhsani (b), Nurhamidah (a), Dwita Oktiarni (c) a) Study Program of Chemistry Education, Faculty of Teacher Training and Education, University of Bengkulu, Jalan W.R. Supratman Kandang Limun, Bengkulu, Indonesia *wiwit[at]unib.ac.id b) Research Center for Oceanography, National Research and Innovation Agency, Jalan Pasir Putih 1 Ancol, Jakarta, Indonesia c) Study Program of Chemistry, Faculty of Mathematics and Natural Sciences, University of Bengkulu, Jalan W.R. Supratman Kandang Limun, Bengkulu, Indonesia Abstract This study assessed the sources, transport, and distribution of macronutrients including nitrate, nitrite, silicate, and phosphate starting from the upper stream of the Bengkulu River which is the biggest river in Bengkulu Province to the coastal seawater of the eastern tropical Indian Ocean. The sampling was conducted during the dry season in July 2024. The water samples were collected from the surface waters of 15 stations. The macronutrients in the water samples were determined using a spectrophotometer UV-Vis following the Strickland and Parsons (1972) method. Macronutrient analysis was conducted in the Integrated Marine Biosphere Research Laboratory of BRIN Jakarta Indonesia. The concentration of analysed macronutrients ranged from 0.005 - 0.058 mgN-NO3/L for nitrate, <0.001 - 0.014 mgN-NO2/L for nitrite, 0.163 - 9.314 mgSi-Si(OH)4/L for silicate, and 0.01 - 0.085 mgP-PO4-/L for phosphate. Several stations, including stations 6, 10, and 14, exhibited relatively elevated nitrate concentrations, which were further supported by similarly high levels of phosphate. Stations 6, 10, and 14, situated near areas of intense anthropogenic activity in Bengkulu City, suggest that human-induced inputs have enriched the water environment with macronutrients. The highest silicate concentration was observed at station 1, located upstream in the Bengkulu River. This aligns with previous findings and underscores the role of weathering processes in controlling silicate distribution. Compared to the macronutrient concentration guidelines for river water set by Indonesian Government Regulation 2021 No. 22, the nitrite concentrations at certain river stations exceeded the safety threshold for aquatic biota, whereas nitrate and phosphate levels remained within the safe range. Keywords: Bengkulu River, estuary, macronutrients, environmental assessment Share Link | Plain Format | Corresponding Author (Wiwit Wiwit)

92	Chemistry	ABS-155
Identification Chemistry Pre-Service Teacher^s Misconception on The Topic Atomic Structure Rika Siti Syaadah (a*), Maria Paristiowati (b), Hayyun Lisdiana (b) Universitas Negeri Jakarta Abstract This study aimed to identifying pre-service teachers^ misconceptions in atomic structure through three-tier diagnostic test. Misconceptions are inaccurate understandings held by students which often became obstacles in learning (Duit & Treagust, 2008). Students thoose who have misconceptions about atomic structure will have difficulty to understanding others chemical matterials are related to atomic stucture. The study employ survey as a methodology which involved 138 pre-service chemistry teachers. The instrument used in this study was a 10 questions three-tier diagnostic test compiled by Treagust. Results showed pre-service teachers held misconceptions about atomic size (64,493%), particle of an atom and element (60,507%), atom in periodic table (73,9%), element symbol (41,66%). Based on findings it is recommended to implement teaching strategies and assesment that relate to material characteristics. Keywords: , pre-service teachers, misconceptions, atomic structure, diagnostic-test, three-tier Share Link | Plain Format | Corresponding Author (Rika Siti Syaadah)

93	Chemistry	ABS-159
Feasibility Study of Purple Sweet Potato (Ipomea batatas L.) Beet Extract as An Acid Base Titration Indicator Sura Menda Ginting (a), Ezra Winnerita Malau (a) (a) Chemistry Education, University of Bengkulu Abstract Acid Base titration is an analytical method for acid or base concentration determination. Acid-base indicators is often used to determine the endpoint of the titration where it shows a contrast colour change. For acid-base titrations, these changes should be near or at the pH range of equivalent point of the titrant and the analyte. Plant extract contains anthocyanin can be used as acid-base indicators as anthocyanin can form flavylium (AH+) which has red color in acid condition and deprotonated into carbinol followed by quinoidal base in base condition, which has pale color and bluish purple respectively. Purple sweet potato beet extract can be used as an alternative of acid-base indicators as it contains anthocyanin. However, to use it as acid-base titration, the color change must be at the pH range of the equivalent point. The extract shows the color change from pink/purple in acid condition, to colorless and then to green followed by yellow when tested with solution from pH 1-14. Further investigations by spectrophotometer UV-Visible shows changes in &#955-max from 518-558 nm (purple/pink) at pH range from 1-9 to 600-616 nm (green/blue) at pH range of 10-11. Application of this indicator to the titration process shows that the concentration difference between calculation and the actual concentration is between 0,1-0,9 % where it is concluded that the performance of the indicator is effective for titration process Keywords: purple sweet potato- titration- indicator Share Link | Plain Format | Corresponding Author (Sura Menda Ginting)

94	Chemistry	ABS-160
Microwave-assisted activated carbon from oil palm trunk waste for lead removal: Characterization, equilibrium, and kinetic studies Miftahul Khair (a*), Rozia Elina (a), Delviana Dwi Jaya (a), Desy Kurniawati (a), Ardi (b) (a) Department of Chemistry, Universitas Negeri Padang, Padang, 25131, Indonesia *miftah[at]fmipa.unp.ac.id (b) Department of Biology, Universitas Negeri Padang, Padang, 25131, Indonesia Abstract The economic value of oil palm trunk waste can be enhanced by converting it into activated carbon. This study aims to produce activated carbon from oil palm trunk waste using microwave activation, following green chemistry principles. The study involved two stages: carbonization at varying temperatures (250, 300, and 350 C) for different durations (60, 90, 120, and 150 minutes) and microwave activation. The activation stage was conducted with and without deionized water (5:1 ratio) at different microwave powers (150, 300, and 450 watts) and radiation times (1, 2, 3, 4, and 5 minutes). The optimum carbonization conditions were 250 C for 60 minutes, resulting in a fixed carbon content of 74.88% and an iodine number of 401.6537 mg/g. The optimum microwave activation conditions were 450 watts for 3 minutes, which increased the iodine number to 813.5856 mg/g, indicating the potential of the material as an adsorbent. The characteristics of the produced carbon met the Indonesian National Standard (SNI) 06-3730-1995. Fourier Transform Infrared (FTIR) spectroscopy confirmed the presence of hydroxyl (-OH), carbonyl (C-O), alkene (C=C), and alkane (C-H) functional groups in the activated carbon. X-Ray Diffraction (XRD) analysis revealed the crystalline graphitic structure of the carbon. The optimum conditions for lead (Pb2+) adsorption were determined as pH 4, an initial Pb2+ concentration of 100 ppm, and a contact time of 160 minutes. The adsorption isotherm followed the Langmuir model with a high regression coefficient (R2 = 0.9932) and a maximum adsorption capacity of 3.1806 mg/g. The pseudo-second-order kinetic model best described the adsorption process, with a rate constant (K) of 0.0003 g/mg min and R2 = 0.9119. This study demonstrates the successful production of activated carbon from oil palm trunk waste using microwave activation. The produced activated carbon exhibited high efficiency for Pb2+ removal, making it a promising adsorbent for wastewater treatment. Keywords: Oil palm trunk waste, microwave activation, activated carbon, lead removal, adsorption isotherm, adsorption kinetics Share Link | Plain Format | Corresponding Author (Miftahul Khair)

95	Chemistry	ABS-161
Developing Soft Skills and 21st Century Competencies through STEAM Projects in Acid-Base and Buffer Solution Topics Hayyun Lisdiana*, Achmad Ridwan, Elma Suryani, Tritiyatma Hadinugrahaningsih, Egavairanti Intania Bilqis Chemistry Education, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta Abstract This research aims to develop soft skills and 21st century skills through project-based learning (PjBL) through the STEAM (Science, Engineering, Technology, Art, and Mathematic) project in the study of acid -base equilibrium, salt hydrolysis and buffer solutions. Participants in this study were 32 students in chemistry class 2024. The research method used is a qualitative method. The focus of this research is the integrations and learning implications of the PjBL learning model in the Dillemmas STEAM project on acid -base equilibrium, salt hydrolysis and buffer solutions. The STEAM project carried out is a poster about topic dilemmas story. Data collection techniques through interviews, reflective journals, classroom observations, supported by CCVLES Questionnaire and 21st Century Skill^s . The results showed that students were interested and motivated in making STEAM projects. 21st Century skills, which consist of life and career skills, learning and innovation skills, and technology skills, are evident in the use of this approach. Other implications that arise such as curiosity, responsible, aplly chemistry in daily live, motivation, empathize with communication, respect each other and self-confidence emerge in the learning-making process. This STEAM approach can be used as an alternative in learning chemistry. Keywords: STEAM approach, 21st Century skills, CCVLES, PjBL, acid-base equilibrium, salt hydrolysis, buffer solutions Share Link | Plain Format | Corresponding Author (Hayyun Lisdiana)

96	Chemistry	ABS-162
Integration of Plastic Waste Pyrolysis Technology in STEM-Chemistry Learning to Improve Students^ Environmental Knowledge and Attitude Euis Nursaadah*1, Raidatul Fannyda2, Aceng Ruyani1 1Magister in Natural Science Education, Universitas Bengkulu 2MAN Insan Cendikia Bengkulu Tengah Abstract STEM (Science, Technology, Engineering, and Mathematics)-based learning generally utilizes complex real-life problems such as waste management, fuel needs, environmental pollution management and others as a learning context. This study integrates the plastic waste pyrolysis process as a learning context by applying knowledge and practices from various disciplines to STEM chemistry learning. Students^ environmental knowledge and attitudes were analyzed after using integrated hydrocarbon concept teaching materials for STEM-based plastic waste pyrolysis. The research method used was a quasi-experimental design with a two-group pre-test-post-test design. Both the control and experimental classes each consisted of 16 students at MAN Insan Cendikia Bengkulu. The learning process in the control class implemented STEM learning using learning media in the form of plastic waste pyrolysis modules and videos. The experimental class implemented STEM learning using modules, videos, and direct plastic waste pyrolysis practicums. The results showed that the average percentage of N-Gain environmental knowledge in the experimental class was 67.32 while the control class was 46.67. In addition, the environmental care attitude of students in the experimental class in the domain of environmental appreciation is 88, environmental attention is 80, environmental sensitivity is 88, and environmental problem solving motivation is 83, while the control class percentages for each indicator are 75, 72, 78, and 80. STEM-based learning that includes various media and practical methods has been proven to provide additional benefits, deepening students^ understanding, and increasing student involvement in environmental issues. Keywords: pyrolysis, plastics, waste, STEM, chemistry Share Link | Plain Format | Corresponding Author (Euis Nursaadah)

97	Chemistry	ABS-164
Please Just Try to Submit This Sample AbstractThe Synthesis of CaO-SiO2 Heterogeneus Catalyst Based Cockle Shell and Areca Nut Fiber Waste for Biodiesel Production from CPO Nurhayati, Muhdarina, Mukhlis, T. Abu Hanifah and Siti saidah Siregar1 Universitas Riau Abstract Keywords: Heterogeneous Catalyst, Biodiesel, CaO-SiO2, waste shell, transesterification Share Link | Plain Format | Corresponding Author (Nurhayati Nurhayati)

98	Chemistry	ABS-168
Synthesis of Chalcone-Coumarin Hybrid with the Assistance of Ultrasonic Waves and In Silico Test of alpha Glucosidase Enzyme Aldi Dwi Febrianto(a*), Hanhan Dianhar(b), Elsa Vera Nanda(c) a) Chemistry, Jakarta State University Jl. Rawamangun Muka, RT.11/RW.14, Rawamangun, Pulo Gadung, Kota Jakarta Timur, DKI Jakarta. *aldidwi145[at]gmail.com (b) Faculty of Mathematics and Natural Sciences Abstract Type 2 diabetes mellitus is one of the diseases that is quite common in Indonesia, even in the world. Several commercial drugs have been developed, but they cause various side effects that can be detrimental so that research is needed to develop drug candidates from natural compounds. Secondary metabolites such as chalcones and coumarins show interesting bioactivity as antidiabetics, making it possible to form hybrid compounds from chalcones and coumarins to increasing their bioactivity. In addition, hybrid compounds also have the advantage of reducing side effects and overcoming drug resistance compared to their precursor compounds. In this study, nine chalcone-coumarin hybrid compounds were synthesized by ultrasonic method using H2SO4 catalyst and glacial acetic acid solvent. The yield obtained was 31.56 - 83.00% with 3-[(2E)-3-(4- methoxyphenyl)prop-2-enoyl]-8-methoxy-2H-chromen-2-one (B2) receiving the highest yield. The nine hybrid compounds were tested for molecular docking against alpha glucosidase enzyme and it was found that all compounds had good potential as potential agents against diabetes with the compound 3-[(2E)-3-(4- methoxyphenyl)prop-2-enoyl]-7-hydroxy-2H-chromen-2-one (CI) having the highest Gibbs free energy and Ki values, namely -8.53 kcal/mol and 0.56 mikro molar Keywords: anti-diabetic, type 2 diabetes mellitus, chalcone-coumarin hybrid, ultrasonic. Share Link | Plain Format | Corresponding Author (Aldi Dwi Febrianto)

99	Chemistry	ABS-184
Preparation and Characterization of Pt/TiO2 Nanotube Arrays (TNAs) cathode using Photoreduction Method for Hydrogen evolutionust Try to Submit This Sample Abstract Sherly Kasuma Warda Ningsih1,2, Rahmat Wibowo1, Jarnuzi Gunlazuardi1* 1 Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, 16424, Indonesia 2Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Kampus Air Tawar, Padang 25132, Indonesia Abstract TiO2 nanotube arrays were fabricated using two step anodization method. TNAs have been modified by photoreduction technique with Pt as the cathode in the photoelectrocatalytic zone for reduction reaction of H+ to produce hydrogen. TNAs with Pt was modified using hexachloroplatinic acid (H2PtCl6) as the precursor by immersion of this solution on the TNA substrate. Pt/TNAs were characterized using SEM-EDX, XRD, UV-Vis DRS, Raman Spectroscopy, Photoluminescence (PL), and photoelectrochemical analysis. The results show that the morphology of TNAs in the tube forms 2.1 &#61549-m in height, and Pt nanoparticles are formed on the mouth wall of the tube with a size of around 10 nm. EDX analysis was carried out to determine the composition of Pt/TNAs is around 0.15%, Ti 37.09%, and O 62.76%, indicating that Pt has been decorated on the TNAs photoanode. The band gap value of Pt/TNAs is around 2.82 eV. The diffractogram shows three groups of diffraction peaks, indicating the presence of anatase TiO2, Ti as a substrate, and Pt, which has been modified in the TNAs. The Raman peaks of TNAs are confirmed to appear at Raman shifts of 144.75, 196.51, 395.94- 517.14, and 638.85 cm-1, indicating the active Raman phonon modes Eg(1), Eg(2), B1g(1), A1g(1)+ B1g(2) and Eg(3), respectively. PEC cathodes for hydrogen production using Pt-decorated TNAs have been successfully prepared using photoreduction. Keywords: TNAs, Pt, photoreduction, cathode, photoelectrocatalytic Share Link | Plain Format | Corresponding Author (Sherly Kasuma Warda Ningsih)

100	Chemistry	ABS-185
Biosorption of Cd2+ Metal Ions using Longan Peels Modified with Cationic Surfactant CTAB (Cetyltrimethylammonium Bromide) Desy Kurniawati1*, Popi Patricia1, Sherly Kusuma Warda Ningsih1, Deski Beri1, Linda Hevira2 1Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Negeri Padang, Padang, West Sumatera 2Department of Pharmacy, Faculty of Health Science, Universitas Mohammad Natsir Bukittinggi, Bukittiinggi, West Sumatera Abstract Heavy metal pollution of aquatic ecosystems poses a significant health risk to humans and endangers ecosystems. One of the harmful heavy metals is the Cd2+ ion. The threshold for cadmium ions allowed in water is 0.01 mg/L. Biosorption is one effective method for mitigating the impact of metal pollution, using biosorbents derived from agricultural and plantation waste. Biosorbent from longan peels, modified with the cationic surfactant CTAB, aims to increase the sorption capacity of biomass for heavy metal ions. This research was conducted using the batch method. The results from various conditions identified the optimum state of Cd2+ ion sorption at pH 5 and a concentration of 400 ppm, with an absorption capacity of 12.5 mg/g. An adsorption isotherm study was conducted, yielding a Langmuir equation with a regression coefficient value (R2 = 0.6862) and a Freundlich isotherm with a regression value (R2 = 0.9594). The Freundlich isotherm produced a regression coefficient value closer to one, indicating it is a better fit, with a maximum sorption capacity of 25.906 mg/g. Keywords: Biosorption, Cadmium, Longan peels, Surfactant, Waste Share Link | Plain Format | Corresponding Author (Desy Kurniawati)

101	Computational Science	ABS-55
Optimization of Support Vector Machine Performance for Prediction of Stunting Status in Toddlers Irfan Fadil (a*), Ucu Koswara (b) a) Faculty of Information Technology, Sebelas April University Jalan Angkrek Situ No. 19 Sumedang,Indonesia *fadilirfan[at]unsap.ac.id b) Faculty of Teacher Training and Education, Sebelas April University Jalan Angkrek Situ No. 19 Sumedang, Indonesia Abstract Indonesia is one of the countries with various nutritional issues. Indonesia is still working hard to overcome nutrition issues, one of them is stunting. In Sumedang Regency, the percentage of stunted toddlers is the highest compared to other nutrition issues. Stunting is a major threat to the quality of human resources in the future. The purpose of this research is to optimize the performance of the Support Vector Machine (SVM) algorithm to produce a good model for classifying or predicting stunting status in toddlers. In this study, the performance of the SVM algorithm will be tested in predicting the stunting status of toddlers using data from Tanjungmedar District, which is the area with the most stunting cases in Sumedang Regency in 2020. Our tests use RapidMiner software and apply the SMOTE (Synthetic Minority Oversampling Technique) to overcome imbalanced datasets so as to optimize the resulting performance. Performance assessment uses confusion matrix to measure Accuracy, Precision, Recall, and F1-score. The results show that SMOTE can optimize the performance of the SVM algorithm by balancing the distribution of target classes on the dataset. At the beginning of testing, the SVM model can produce an accuracy of 85.10%. After applying SMOTE, the accuracy of the SVM model increased to 89.08%. Based on the results of the research conducted, it can be concluded that the SVM classifier with SMOTE optimization is appropriate to be used as a model for classifying or predicting stunting status in toddlers. Keywords: Data Mining-Support Vector Machine-SMOTE-Stunting Share Link | Plain Format | Corresponding Author (Irfan Fadil)

102	Computational Science	ABS-112
DESIGN OF SHARIA PEER TO PEER LENDING INFORMATION SYSTEM FOR ANDROID BASED MSMEs (AMINAH)to Submit This Sample Abstract Med Irzal, Togu Annaaf Kumara, Ari Hendarno Universitas Negeri Jakarta Abstract Based on survey results from the Indonesian Central Statistics Agency (BPS), it was noted that 69.02% of the assistance needed by MSMEs to survive was business capital. MSMEs that do not have official business entities have difficulty gaining access to funding sources, whether from conventional banking, cooperatives or government programs. The Central Statistics Agency also noted that there were very few MSEs who took business loans from banks for various reasons, including 6.36% because they did not know the procedures, 7.34% because the procedures were difficult, 1.09% because the application was rejected, 12, 69% due to high interest rates, and 12.37% did not have collateral. To help micro, small and medium enterprise (MSME) owners overcome capital shortages, the author will create an information system that implements Financial Technology (Fintech) with the concept of sharia-based peer to peer lending. This system will provide loans without complicated fees and high interest rates. This system will also act as a liaison between business owners who need loans and capital owners who want to help others. Based on the results of black box testing, this sharia peer to peer lending (Aminah) information system shows that its functionality is running well, with an average score of 90%. This shows that the system as a whole has met user expectations. Apart from that, the system was also considered very suitable for use, with an average score of 89%. Keywords: Sharia peer to peer lending, Financial Technology, MSMEs, Android. Share Link | Plain Format | Corresponding Author (Ari Hendarno)

103	Computational Science	ABS-135
Text Mining for Mapping Key Factors and Trends in Technology-Enhanced Problem Solving in Teaching and Learning Geometry Della Maulidiya, Nur Aliyyah Irsal Universitas Bengkulu, Sekolah Tinggi Pertanahan Nasional Abstract Integrating technology in geometry problem-solving holds substantial potential for enhancing students^ mathematical problem-solving skills. Many research articles on the use of technology in geometry problem-solving education have been published, offering a rich source of secondary data for mapping research trends, identifying key factors, and understanding challenges in implementing technology in this domain. This study utilizes text mining techniques using R software to process and analyze 197 journal articles from the ERIC database, covering 79 journals and 344 authors. The analysis includes performance analysis (annual publication trends and three-field plot) and co-word analysis based on keywords plus, titles, and abstracts. Findings indicate significant growth in this research area, with an annual growth rate of 32.26% between 1985 and 2024. Topic trend analysis reveals a progression in the research focus, shifting from the role of software as a teaching aid to a crucial, integrated component of active learning. Co-word analysis, including keyword frequency extraction, trend topics, and factorial analysis, identifies critical factors for implementing technology in geometry problem-solving, such as using dynamic software, developing spatial abilities, and the preparedness and competence of teachers in integrating technology. However, challenges such as limited access, difficulties adapting technology for complex geometry tasks, and concerns regarding the validity of technology-based learning approaches present significant barriers that must be addressed to optimize technology use in geometry education. These insights provide valuable guidance for educational technology developers, researchers, and educators aiming to enhance the effectiveness of technology integration in geometry instruction. Keywords: Geometry Problem Solving, Technology-Enhanced Learning, Educational Technology, Dynamic Software, Text Mining, Share Link | Plain Format | Corresponding Author (Della Maulidiya)

104	Computational Science	ABS-181
Identification of DNA Mutations in Coffea liberica from Kepulauan Meranti Using Next Generation Sequencing Tisha Melia, Fatayat, Ninik Nihayatul Wahibah and Siti Fatonah Faculty of Mathematics and Natural Sciences, Universitas Riau Abstract Coffee is Indonesia^s most prominent agricultural product, cultivated primarily as either robusta (Coffea canephora Pierre ex A. Froehner) or arabica (Coffea arabica L.). It is unfortunate that these two coffee species are not well suited for cultivation on peatlands. The Ministry of Agriculture has introduced two superior varieties, Liberoid Meranti 1 (Lim 1) and Liberoid Meranti 2 (Lim 2), derived from the Coffea liberica species found in Kepulauan Meranti. These two varieties offer the dual benefit of being suitable for planting on peatlands and exhibiting resistance to leaf rust disease. Unfortunately, scientific studies on these two coffee varieties are currently limited to the investigation of disease resistance genes. Consequently, there is a necessity for scientific studies to gather genetic data from Lim 1 and Lim 2 with the objective of investigating their high adaptability in peatlands. The DNA was extracted and subsequently sequenced using next-generation sequencing technology, allowing for the reading of DNA sequences from six plants. Three plants were selected from each variety for analysis. A total of 414 million sequencing reads were successfully mapped to the C. canephora genome, with an average of 69 million mapped reads per sample. The mapped reads were used to identify single nucleotide polymorphisms (SNPs) and small indels. Many of the identified DNA mutations were specific to each variety, thus making them suitable for use as variety identification markers. The study provides a comprehensive investigation into the DNA mutations present in Lim 1 and Lim 2. This will not only enrich the genetic data in public databases, but also provide a foundation for investigating the evolution and habitat adaptation of these two varieties. Keywords: bioinformatics- DNA- mutation- Coffea liberica- genomics Share Link | Plain Format | Corresponding Author (Tisha Melia)

105	Computational Science	ABS-187
Application of naive Bayes Algorithm in Expert System for Diagnosing Chili Plant Diseases Based on Growth Phase on Peatland Fatayat1 Wahyu Lestari2 Alfirman3 Kampus Bina Widya Km 12,5 Fakultas FMIPA Simpang Baru Pekanbaru 28293 Riau Indonesia Abstract Agricultural development on peatlands has its own challenges, especially in the cultivation of chili plants that are susceptible to various diseases. Therefore, an expert system is needed that can help farmers diagnose chili plant diseases quickly and accurately based on the plant growth phase. This research aims to apply the naive Bayes algorithm to the expert system for diagnosing Capsicum annum L (Chili) plant diseases.The expert system is able to diagnose several types of diseases on chili plants in peatlands, such as anthracnose, fusarium wilt, and leaf curl disease. Each diagnosis is based on symptoms observed in each phase of plant growth, from the vegetative phase to the generative phase. From the results of the calculation of the naive Bayes algorithm classification of trial data, there are 8 symptoms of the disease contained in the sample of disease symptoms: G102, G104, G0112, and G114. To determine the results of classification vi with eight codes, the name of the disease has the largest multiplication result with a value of 2.94 by using the equation two formula on codes P102, P104, and P106 according to the name of the disease. This research can be further developed with other crops grown on peatlands or other soils and using different applications to be developed in the field of agriculture in diagnosing plant diseases and various other crops, especially on peatlands that have characteristics at high soil moisture levels, low soil PH, and a tendency to fire or rapid chemical changes. This research also has prospects for collaboration with agricultural research institutions and the government in order to develop technologies to increase agricultural productivity. using this system as part of a smart agriculture support program for farmers in various regions. Keywords: Peatland Disease Diagnosis naive Bayes Expert System for Chili Plants Share Link | Plain Format | Corresponding Author (fatayat fatayat)

106	Mathematics	ABS-6
Photomath Application for Learning Algebra: Preliminary Study on School in Border Area Meiva Marthaulina Lestari Siahaan (a*), Cecilia Novianti Salsinha (a), Lailin Hijriani (a), Selestina Nahak (a), Farida Daniel (b) a) Department of Mathematics Education, University of Timor Jalan Eltari KM 7, Kefamenanu, NTT, Indonesia *meivamarthaulina[at]unimor.ac.id b) Department of Mathematics, Soe Institute of Education Jalan Badak No. 5A, Soe, NTT, Indonesia Abstract Integrated learning with technology can stimulate students to be motivated to understand material and then carry out independent learning and to learn anywhere. The teacher as a facilitator who interprets work steps and directs the use of technology. Photomath AI technology is considered easy-to-use since it can be accessed via smartphone and performes answer instructions for users. Algebra is important material as a transition from elementary to middle school, thus it is the beginning of the concrete to abstract thinking system experienced by students. The aim of this research is to determine the effect of using photomath on students^ cognitive abilities and measure students^ attitudes towards using photomath in terms of motivation, belief and readiness. The instruments used were pretest, posttest and questionnaire. This research is also an initial study of the use of technology in a school in the border area. This research uses qualitative and quantitative methods. The qualitative method for analyzing student answers is assisted by photomath. The quantitative method is pre-experiment with One-group pretest-posttest design. The results of this research were that there was an increase in test scores by 36.25%, students^ learning motivation in using photomath was 82.97%, which is very strong motivation, students^ trust in photomath was 88.13%, which is very strong, and students^ readiness in using it photomath is 78.97%, which is strong in students^ readiness to use photomath. After using Photomath, students more understand each stage of working on algebra questions so that Photomath helps students in providing answers to algebra questions. Keywords: Algebra- Border area- Photomath- Preliminary study Share Link | Plain Format | Corresponding Author (Meiva Marthaulina Lestari Siahaan)

107	Mathematics	ABS-14
On -N--Soft Hyperstructures Fakhry Asad Agusfrianto[1], Yudi Mahatma[1] [1] Mathematics Study Program, Universitas Negeri Jakarta, Indonesia Abstract The notion of soft sets is an extension of fuzzy sets. This notion first introduced by Molodtsov in 1999. There are many types of soft sets, one of them is -N--soft sets. In previous research, -N--soft sets can be applied on algebraic structures, such as groups, rings, and modules. Since hyperstructures is a generalization of algebraic structures, inspired by previous research, this paper aims to introduced new concepts on -N--soft sets, this concept is called -N--soft hyperstructures. In this paper, the discussion focuses on the definition of -N--soft hypergroups, -N--soft join spaces to the definition of homomorphisms on -N--soft hypergroups. Keywords: Please Just Try to Submit This Sample Abstract Share Link | Plain Format | Corresponding Author (Fakhry Asad Agusfrianto)

108	Mathematics	ABS-17
Integrating SDGs into Numeracy Tasks: Assessing Indonesian High School Math Teachers^ Problem Posing Skills through Nutrional Facts Khaerun Nisa (a*), Vivi Novita Sari (b) a) Research Center for Education, National Research and Innovation Agency, Jakarta 12710, Indonesia *khae003[at]brin.go.id b) State Islamic High School 1 Bulukumba, South Sulawesi 92552, Indonesia Abstract The nutritional facts on food and beverage packaging, including portion sizes, caloric content, and macro- and micronutrient information, offer a rich mathematical framework for problem formulation. This study explores how nutritional data can be used to create mathematical tasks aligned with the Sustainable Development Goals (SDGs), specifically SDG 3 (Good Health and Well-Being) and SDG 4 (Quality Education). Given the rising incidence of early-onset kidney failure among Indonesian youth, there is a critical need for enhanced nutritional education. We evaluated 22 mathematical tasks designed by 12 educators from the Mathematics Teachers^ Forum (MGMP) in Bulukumba, South Sulawesi, Indonesia, who teach grades 10 and 11 under the Merdeka Curriculum. The tasks were analyzed based on their contextual use and cognitive processing levels. The findings show a range of context applications, primarily at the first-order level, and most tasks demonstrated application-level cognitive processing, with only a few classified as reasoning tasks. However, tasks with second-order contexts often involved reasoning. These results highlight the potential for developing more sophisticated and contextually relevant mathematical problems using nutritional data, which can enhance mathematics education and improve students^ nutritional awareness, addressing public health issues like early-onset kidney failure. Keywords: Mathematics teachers - Numeracy taks - Nutrition facts - Problem posing - SDGs. Share Link | Plain Format | Corresponding Author (Khaerun Nisa)

109	Mathematics	ABS-22
Exploring Pre-service Mathematics Teachers^ Perceptions of ICT Use in Mathematics Teaching in Indonesia St. Aflahah (a*), Nursyam Anaguna (b) a) National Research and Innovation Agency, Indonesia *staf001[at]brin.go.id b) University of West Sulawesi, Indonesia Abstract This study aimed to explore pre-service mathematics teachers^ perceptions of ICT use in mathematics teaching in Indonesia, their experiences in using ICT during their teaching training for three months, and the consistency between their perceptions and the Indonesian curriculum standards of ICT integration in teaching. Participants included three pre-service mathematics teachers who have learned four courses related to technology use in mathematics teaching which are algorithm and computer programming, web programming, mathematics computation, and mathematical statistics and they have completed teaching training in secondary schools in Makassar for three months. A case study methodology with semi structured interview was utilized in this study. Technology acceptance model (TAM) was used as a framework in constructing the interview questions to explore detailed information from the participants. Research results presented that three pre-service mathematics teachers perceived the usefulness and ease of use of ICT integration in mathematics teaching. They also showed positive attitudes towards ICT use in mathematics teaching and behavioral intention to use ICT in their actual teaching. They found that their university education which facilitates courses related to technology use in mathematics teaching and sufficient learning facilities helped them to use ICT during their teaching training. However, some educational issues which are not controlled by pre-service mathematics teachers hinder the implementation of ICT use in their teaching. The inadequate learning facilities in schools and the immature concept of ICT use in mathematics teaching in the curriculum were the problems emerged in this study. In relation to the Indonesian curriculum standards of ICT integration in teaching, all participants^ perceptions were consistent with such standards. They used ICT in their mathematics teaching, particularly using technological tools. They also used ICT to communicate with students and improve their capacity as the future teachers. Finally, this has implications for pre-service and in-service teachers, the government, education policy makers, stakeholders, researchers, and those with responsibility for creating the strong link between tertiary education and school curriculum, and the availability of facilities to support the implementation of ICT use in teaching. Keywords: ICT use- mathematic teaching- pre-service mathematics teachers- perception Share Link | Plain Format | Corresponding Author (St Aflahah)

110	Mathematics	ABS-30
ETHNOMATHEMATICS: TRADITIONAL MUSICAL INSTRUMENT ^SALUANG^ IN WEST SUMATRA FATHUR RAHMI UIN SJECH M.DJAMIL DJAMBEK BUKITTINGGI Abstract Mathematics is one type of learning that is integrated into everyday life, including culture. Indonesia is famous for its diverse cultures, including the Minangkabau culture in West Sumatra. Mathematical concepts are embedded in cultural practices, this is usually called ethnomathematics. Minang ethnomathematics is mathematics found in Minang culture and is usually implemented in activities in society. Traditional musical instruments are one of the unique things in a culture. Saluang is one of the traditional musical instruments of the Minang tribe. The aim of this research is to understand the mathematical concepts of saluang and understand the application of ethnomathematics to the saluang musical instrument. The research method used is descriptive qualitative. Data was found from direct observation, interviews, literature review and documentation. The results obtained from this research are that the saluang musical instrument contains cultural values and mathematical concepts at the same time which include plane shapes, spatial shapes and number patterns. Keywords: Ethnomathematics- Minang Culture- Saluang Share Link | Plain Format | Corresponding Author (Fathur Rahmi)

111	Mathematics	ABS-35
Mathematical Reasoning: An Analysis of Madrasah Ibtidaiyah Prospective Teacher Education (PGMI) Teachers Abilities Arsyiyatul Alawiyah (a*), Ratna Widianti Utami (b), Rahmat Hidayat (b) Universitas Siliwangi(a*) Tasikmalaya, Indonesia arsy71[at]gmail.com STAI Putra Galuh Ciamis (b) Ciamis, Indonesia Abstract Mathematical reasoning is the process of drawing conclusions about a number of ideas based on existing facts when solving mathematical problems. This reasoning ability is one of the abilities that must be possessed when learning Mathematics. Given the importance of reasoning ability, prospective teachers are expected to have the ability to develop their own Mathematical reasoning. The research aims to analyze the athematical reasoning ability of Madrasah Ibtidaiyah Teacher Education (PGMI) novice teachers abilities at STAI Putra Galuh Ciamis. The type of research used is mixed method. The subjects in the research were 21 prospective teachers from the Madrasah Ibtidaiyah Prospective Teacher Education study program. Subjects were taken using the purposive sampling technique. Data analysis techniques include data reduction, data presentation, data interpretation, and conclusion drawing. The research provides results showing that as many as 58% of prospective teachers are still in the very low category in their Mathematical reasoning skills. Mathematical reasoning ability on indicators of analyzing Mathematical situations has an average of 69% in the moderate category, then on indicators of planning the solution process 63% in the moderate category, solving problems with systematic steps 57% in the low category, and drawing logical conclusions 50% in the very low category. Keywords: Mathematical reasoning ability, prospective teachers Share Link | Plain Format | Corresponding Author (ARSYIYATUL ALAWIYAH)

112	Mathematics	ABS-36
AHP-TOWS in Couple Entrepreneurs: Case of SME Herbal Business Martino Wibowo 1, a) Yanto Sidik Pratiknyo 2, b) Universitas Terbuka Abstract Research into husband and wife entrepreneurship as a romantic couple is an alternative in developing entrepreneurship with the concept of AHP TOWS This research shows that the AHP approach which uses TOWS for strategy selection as criteria and alternative strategies can be used to identify the success of a business, especially in couple entrepreneurs. SWOT and TOWS analysis can be used to continue with AHP. Keywords: AHP, TOWS, Herbal, Couple entrepreneurs Share Link | Plain Format | Corresponding Author (Yanto Sidik Pratiknyo)

113	Mathematics	ABS-37
Estimating Air Pollution Index in Indonesia as Effort to Increase Life Expectancy Fanny Novika Trisakti School of Insurance Abstract High levels of unhealthy Air Pollution Index (API) can severely impact human health and the environment. Thus, effective preparation for such risk events relies on precise estimation of unhealthy API levels. This study proposes the Hierarchical Generalized Pareto Distribution (H-GPD) Method based on the Bayesian framework to obtain accurate estimation of API exceedance in Indonesia. This study will look at the provinces with the worst API as an effort to obtain great benefits if they succeed in cleaning the air effectively so that they can increase life expectancy. To produce the model, three parameters are determined in H-GDP, namely location, scale and shape in each province in Indonesia. Unhealthy API are governed by the Fu distribution function of variable x above the threshold u = 100. The data used in this study are data from IQAir in Indonesia and BMKG. Furthermore, the GDP parameters will be identified and the spatial and seasonal impacts on the marginal density of API data exceedances will be determined using the Hierarchical Model. The accuracy of the model using Goodness of fit through Deviance Information Criteria (DIC) and Akaike^s Information Criteria (AIC). The results show that provinces that have unhealthy API are South Sumatra, West Java, DKI Jakarta, East Java and Central Kalimantan. Keywords: Air Polution Index- Deviance Information Criteria- Hierarchical Generalized Pareto Distribution- Life Expentancy- Share Link | Plain Format | Corresponding Author (Fanny Novika)

114	Mathematics	ABS-39
Development of the X-NUM game on students numeracy skill Makmuri, Tian Abdul Aziz, Ari Hendarno, Savitri, I Gede Eka Pahlguna, Arga Widya Samudera Universitas Negeri Jakarta Abstract This research aims to develop an Android-based mathematics game that integrates concept of number. Data was collected through a questionnaire involving 37 elementary and junior high school students as the main target of this research. The results of the questionnaire showed that 75.5% considered math as a difficult subject at school. There are 91.1% of students like playing games on smartphones and 75.7% feel interested in learning math through games. And 73% of students think that concept of numbers will be more fun if learned by using games. The game is implemented on the Android platform to enhance accessibility and usability on mobile devices. This game is implemented on Android platform to enhance accessibility and usability on mobile devices. The prototyping method was used in the development of this game to enable rapid iteration and continuous functionality testing. The main development tools used are Unity and C# programming language. Testing was conducted through blackbox testing, expert validation, and User Acceptance Testing (UAT) methods to ensure the reliability and quality of the game. Keywords: math game, concept of numbers, android, prototyping method, Unity, C#, blackbox, UAT Share Link | Plain Format | Corresponding Author (Tian Abdul Aziz)

115	Mathematics	ABS-40
The Use of Geometry Expression for Solving Mathematical Modelling Problems: A Ferris Wheel Case Tian Abdul Aziz, Makmuri, Lukman El Hakim Universitas Negeri Jakarta Abstract In the last few years there has been a growing research interest in school mathematical modelling. However, most of the previous studies do not consider the use of technological tools. The study explains how to use a specific technological tool to deal with a mathematical modelling problem, namely A Ferris wheel case. The problem required secondary school students to construct linkage the concepts of trigonometry, circles, velocity, and distance. We propose a step-by-step process for solving this mathematical modelling problem using the Geometry Expression. Subsequently, the result obtained by technological tool is compared with the results obtained by paper pencil calculation method. At the end, we provide the strength and the weaknesses of using this technological tool. Keywords: Mathematical Modelling- Geometry Expression- Technological tool- Secondary School: Students Share Link | Plain Format | Corresponding Author (Tian Abdul Aziz)

116	Mathematics	ABS-66
Learning One-Variable Linear Equation with the Wetland Environments Context by Using Interactive Media Harja Santana Purba (a), R. Ati Sukmawati (a*), Calista Ramadhan (a) (a) FKIP Universitas Lambung Mangkurat Abstract The purpose of this study was to describe the learning outcomes of students on the material of One-Variable Linear Equation in the context of a wetland environment, using interactive media. This study is a quasi-experimental study. The research sample was students of SMP Negeri 13 Banjarmasin. The research instruments consisted of learning outcome test sheets and questionnaires. The data analysis techniques used were descriptive and inferential statistics. The results showed that there was a significant difference in the N-gain values &#8203-&#8203-of the control class and the experimental class. Based on the results of this study, the interactive media can be used by teachers as an alternative learning media to support student-centered learning. Keywords: interactive media, wetland environment, one-variable linear equations Share Link | Plain Format | Corresponding Author (R. Ati Sukmawati)

117	Mathematics	ABS-68
TOTAL VERTEX IRREGULARITY STRENGTH FOR THE AMALGAMATION PRODUCT OF PRISM AND TRIANGLE GRAPH Susilawati, Syahidah, G. H. Putri, R. Kurnia, N. G. Tampubolon, A. Rahman Faculty of Mathematics and Natural Sciences, Universitas Riau, Jalan H. R. Soebrantas, Kel. Simpang Baru, Kec.Tampan, Pekanbaru Abstract Let G=(V(G),E(G)) be a graph and k be a positive integer. A k-total labeling of G is a function f:V(G)&#8746-E(G)&#8594-{1,2,...,k}. Based on the labeling f, the weight of a vertex v is denoted by wf(v), where wf(v)=f(v)+&#8721-&#9618-&#12310-f(uv)&#12311- for uv&#8712-E(G). A k-total labeling of G is called a vertex irregular total k-labeling if no two distinct vertices have the same weight. The total vertex irregularity strength of G, denoted by tvs(G), is the smallest value of k such that G has a vertex irregular total k-labeling. Consider the graphs G and H, with orders n and m, respectively. The amalgamation of Amal (G,H) is a graph that formed by taking one copy of G and n copy of H, and merging one vertex from each graph G and H in each i-th copy for 1&#8804-i&#8804-n. In this paper we studies about total vertex irregularity strength for the amalgamation product of prism and triangle graph Amal(P_2 &#12310-&#9633-C&#12311-_n,C_3 ). The result show that tvs(Amal(P_2&#9633-&#9633-(C_n ),C_3 ))=&#8968-(4n+2)/3&#8969-. Keywords: Vertex irregularity strength, labelling graph, amalgamation Share Link | Plain Format | Corresponding Author (Susilawati Susilawati)

118	Mathematics	ABS-79
Arithmetic Modifications of Pentagonal Fuzzy Numbers and G-Inverse Applications Era Napra Tilopa, Mashadi, Sri Gemawati University of Riau Abstract Pentagonal fuzzy numbers are an extension of triangular fuzzy numbers. This paper presents various alternatives for the arithmetic operations of pentagonal fuzzy numbers, including addition, subtraction, scalar multiplication, multiplication, division, and inversion. Some researchers have defined the inverse of pentagonal fuzzy numbers in parametric form. However, this approach does not always result in a x a inverse is an identity. which affects the process of determining the inverse of pentagonal fuzzy number matrices. In this paper, the author has introduced new arithmetic modifications for the multiplication, division, and inversion of pentagonal fuzzy numbers. The modified arithmetic results have been used to determine the inverse of pentagonal fuzzy matrices. Additionally, new arithmetic modifications have been developed to determine the G-Inverse for any m x n pentagonal fuzzy matrix or singular matrix. Thus, the application of pentagonal fuzzy numbers using inversion and G-Inverse can produce appropriate solutions. Keywords: Fuzzy numbers, Arithmetic of fuzzy numbers, Inverse of pentagonal fuzzy number matrices, G-Inverse. Share Link | Plain Format | Corresponding Author (Era Napra Tilopa Sihombing)

119	Mathematics	ABS-85
New Algebraic Alternative for Hexagonal Fuzzy Numbers and Its Application in Determine M-P-Inverse Dian Ayu Puspita, Mashadi, Sri Gemawati Department of Mathematics, Faculty of Mathematics and Natural Sciences, Riau University, Pekanbaru, 28293, Indonesia Abstract Various authors have provided multiple alternatives for the algebra of hexagonal fuzzy numbers. One of the fundamental issues with the various algebraic alternatives presented by different authors is the absence of a inverse such that a x a inverse is identity. As a result, many applications of hexagonal fuzzy numbers have consistently yielded incompatible solutions. In this paper, the author constructs a new algebra by using two midpoints for the algebra of multiplication, division, and inversion of arbitrary hexagonal fuzzy numbers. The newly constructed algebra is then developed to determine the M-P-Inverse for any mx n hexagonal fuzzy matrix. Consequently, all applications of hexagonal fuzzy numbers using inverses and M-P-Inverses will yield compatible solutions. Keywords: Fuzzy number arithmetic, Hexagonal fuzzy numbers, M-P-Inverse Share Link | Plain Format | Corresponding Author (Dian Ayu Puspita)

120	Mathematics	ABS-86
Mathematics in Culture: Revealing Hidden Secrets Behinds Indonesian Traditional Ceremonies Magdalena Wangge, Dadan Dasari, Turmudi Indonesian University of Education Abstract Ethnomathematics explores the intersection of mathematics and culture, reflecting how mathematical concepts manifest within local traditions. In culturally rich Indonesia, ethnomathematics holds increasing relevance. This study investigates the presence of mathematical principles in traditional ceremonies, revealing their integration in various cultural elements such as clothing, dances, tools, and ritual. Utilizing a systematic literature review (SLR) method, 27 articles from 2018 to 2024 were analyzed to identity ethnomathematical concepts in Indonesian cultural practices. Findings highlight common patterns like geometric shapes, measurement techniques, and symmetry, evident in artefacts, traditional attire, and ceremonial practices. Additionally, the study underscores the variation in mathematical applications across different regions, reflecting Indonesia^s cultural diversity. These insights have significant implications for developing a more contextual and relevant mathematics education. By connecting mathematical concepts with local culture, ethnomathematics enhances student engagement and understanding, making learning more meaningful and culturally grounded. This approach not only enriches mathematical education but also helps preserve and appreciate Indonesia^s unique cultural heritage, promoting a more inclusive and diverse educational framework. Keywords: Artefacts, Mathematics education, Ceremonial practices, Traditional attire, Contextual learning Share Link | Plain Format | Corresponding Author (Magdalena Wangge)

Page 4 (data 91 to 120 of 171) | Displayed ini 30 data/page
<< PREV 1 2 3 4 5 6 NEXT >>

Powered By Konfrenzi Ultimate 1.832M-Build8 © 2007-2025 All Rights Reserved