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All Journal Jurnal Simetris Jurnal Karya Pendidikan Matematika AKSIOMA: Jurnal Program Studi Pendidikan Matematika EDU-MAT: Jurnal Pendidikan Matematika Eduma : Mathematics Education Learning and Teaching Al Ishlah Jurnal Pendidikan Language Literacy: Journal of Linguistics, Literature, and Language Teaching Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Tarbawi : Jurnal Ilmu Pendidikan Martabe : Jurnal Pengabdian Kepada Masyarakat Teorema: Teori dan Riset Matematika JURNAL NUSANTARA APLIKASI MANAJEMEN BISNIS Saintifik : Jurnal Matematika, Sains, dan Pembelajarannya Psychology, Evaluation, and Technology in Educational Research Al-Khwarizmi: Jurnal Pendidikan Matematika dan Ilmu Pengetahuan Alam Jurnal Onoma: Pendidikan, Bahasa, dan Sastra Jurnal Ilmiah Pendidikan Matematika Al Qalasadi Square : Journal of Mathematics and Mathematics Education Community Empowerment Journal of Mathematics Education and Science International Journal of Business, Law, and Education EMTEKA: Jurnal Pendidikan Matematika JagoMIPA: Jurnal Pendidikan Matematika dan IPA International Journal of English and Applied Linguistics (IJEAL) ADMA: Jurnal Pengabdian dan Pemberdayaan Masyarakat As-Sidanah : Jurnal Pengabdian Masyarakat Sulawesi Tenggara Educational Journal Jurnal Pengabdian Masyarakat Tjut Nyak Dhien Arus Jurnal Psikologi dan Pendidikan JOURNAL OF CHEMICAL NATURAL RESOURCES (JCNaR) Al Basirah SEUNEUBOK LADA: Jurnal ilmu-ilmu Sejarah, Sosial, Budaya dan Kependidikan Geographica: Science and Education Journal Jurnal Sains Natural JME (Journal of Mathematics Education) Journal of Mathematics and Applied Statistics VISA: Journal of Vision and Ideas JME (Journal of Mathematics Education)
Chairuddin Chairuddin
Universitas Sembilanbelas November Kolaka
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Neuroscience Nursing Physics Public Health Social Sciences Other

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Synthesis of Cationic Surfactant N, N-(2-Laurate-Ethyl) Stearamidium Chloride Chairuddin
Journal of Chemical Natural Resources Vol. 3 No. 2 (2021): Journal of Chemical Natural Resources
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (943.965 KB) | DOI: 10.32734/jcnar.v3i2.9362

Abstract

The cationic surfactant of N, N-(2-Lauric-Ethyl) Stearamidium Chloride had been successfully synthesized. It is long-chain alkyl surfactant derivative from ammonium salt with amide. Cationic surfactants that are synthesized from fatty acid derivatives are stearic acid and lauric acid. Stearic acid is used as stearamide-making material which is the product of methyl stearate amidation with diethanolamine use methoxide sodium catalyst. Lauric acid was used as esterification material with stearamide thus obtaining N, N-(2-Lauric-Ethyl) Stearamide of alcanolamide ester. Alcanolamide ester continued by salting reaction use HCl gas until obtained cationic surfactant of N, N-(2-Lauric-Ethyl) Stearimidium Chloride. Each compound analyzed function groups by FT-IR spectrophotometric with the analyzed change of melting points, and a part compound analyzed surface tension characteristic with measuring Critical Micelle Concentration (CMC) with use Du Nouy ring method. The analysis product obtained shows that methyl stearate by yield in the amount of 91.66% shows that melting point of 40.5°C, stearamide with yield in the amount of 87.6% show that melting point as 185°C by CMC value 0.133 mol/ L in 40.7 dyne/cm surface tension. Alcanolamide ester with a yield in the amount of 84.7% has a melting point of 55°C by a CMC value of 0.067 mol/L in 36.1 dyne/cm surface tension, and cationic surfactant has a melting point of 45°C by CMC value 0.055 mol/L in 31,1 dyne/cm surface tension. stearamide with a yield in the amount of 87.6% show that melting point of 185°C by a CMC value of 0.133 mol/L in 40.7 dyne/cm surface tension. Alcanolamide ester with a yield in the amount of 84.7% has a melting point of 55°C by a CMC value of 0.067 mol/L in 36.1 dyne/cm surface tension, and cationic surfactant has melting point as 45°C by CMC value 0.055 mol/L in 31,1 dyne/cm surface tension. stearamide with a yield in the amount of 87.6% show that melting point of 185°C by a CMC value of 0.133 mol/L in 40.7 dyne/cm surface tension. Alcanolamide ester with a yield in the amount of 84.7% has a melting point of 55°C by a CMC value of 0.067 mol/L in 36.1 dyne/cm surface tension, and cationic surfactant has a melting point of 45°C by CMC value 0.055 mol/L in 31,1 dyne/cm surface tension.
Determination of Copper and Zinc Content in Soil Based on Soil Position and Depth in Palm and Rambutan Garden Area Perangin Angin, Elsa Sucita; Chairuddin
Journal of Chemical Natural Resources Vol. 4 No. 2 (2022): Journal of Chemical Natural Resources
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jcnar.v4i2.11969

Abstract

The determination of copper and zinc in soil based on the position and depth at the application land of palm oil in the Rambutan garden. Part of control land, between rorak and plant, and rorak at a depth of 0-20 cm, 20-40 cm and 40-60 cm. Each 3 g soil sample was destructed with 10 mL of HNO3 concentrated at 180ºC for 20 minutes. Cu and Zn's content was determined using Atomic Absorption Spectroscopy (AAS) at wavelength 324.7 nm and  213.9 nm, respectively. The analysis shows that Cu and Zn metal increase rorak at 84.0% and 57.7%, and soil between rorak and plant at 76.9% and 42.4%.
Comparative Study of Lead (Pb) Levels on the Goats Liver at Industrial and Non-Industrial Areas Using Atomic Absorption Spectrophotometry Method Chairuddin; PURBA, NORA MARIHOT; Bangun, Ahmad Darwin
Journal of Chemical Natural Resources Vol. 4 No. 2 (2022): Journal of Chemical Natural Resources
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jcnar.v4i2.11970

Abstract

The comparison of Lead in goat liver in an industrial and non-industrial area. The goat liver was drily digested, and then the ash of the goat liver dissolved with HNO3(p). Qualitative test using Inductively Coupled Plasma – Optical Emission (ICP – OES) where the sample results obtained I (Industrial area) = 0.088 ppm, sample II (Industrial area) = 0.080 ppm, sample III (Industrial area) = 0.086 ppm and sample IV (Non-Industrial area) = 0.022 ppm and Quantitative test determination of Pb content using Atomic Absorption Spectrophotometry (AAS) at a wavelength for Pb 217.0 nm. The result of the determination showed that the content in Lead of sample A (Non-Industrial Area) = 0.4585 mg/Kg, sample B (Non-Industrial Area) = 0.4490 mg/Kg, sample C (Industrial area) = 0.8761 mg/Kg and sample D (Industrial area) = 0.8622 mg/Kg. However, Pb of metal content fulfilled SNI 7387:2009 that 1.0 mg/Kg.
Analysis of Grade X Students' Conceptual Understanding in Solving Problems on Exponential and Logarithmic Competency Tests Based on Apos Theory Ramadhan, Nur Ihsan; Chairuddin, Chairuddin; Tahir, Tahir
JME (Journal of Mathematics Education) Vol 10, No 2 (2025): JME (Jul - Dec)
Publisher : Universitas Sembilanbelas November Kolaka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31327/jme.v10i2.2545

Abstract

This study aims to determine the level of students' understanding of mathematical concepts in exponents and logarithms based on APOS theory at SMA Negeri 4 Binongko. This study uses a qualitative approach with a descriptive method. The research subjects consisted of three tenth-grade students selected based on high, medium, and low ability levels. Data were obtained through competency tests and in-depth interviews, then analyzed based on the four stages of the APOS theory, namely action, process, object, and schema. The results showed that students with high ability had reached the schema stage, students with medium ability were at the object stage, and students with low ability were at the process stage. This indicates that there are differences in the level of conceptual understanding among students according to their respective abilities. Thus, the application of the APOS theory proved to be effective in identifying and mapping students' mathematical understanding of exponents and logarithms. These findings indicate that the APOS theory can be used as a basis for designing learning that encourages the development of students' conceptual understanding in mathematics.
THE EFFECTIVENESS OF THE ALEF DIGITAL CONTENT IN ENHANCING JUNIOR HIGH SCHOOL STUDENTS’ MATHEMATICAL UNDERSTANDING OF EXPONENTS Ulfa, Maria; Chairuddin, Chairuddin; Sari, Dian Ulfa
JME (Journal of Mathematics Education) Vol 10, No 2 (2025): JME (Jul - Dec)
Publisher : Universitas Sembilanbelas November Kolaka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31327/jme.v10i2.2544

Abstract

The integration of digital content in mathematics learning has become increasingly important to improve students’ engagement and conceptual understanding. This study aims to determine the effectiveness of using ALEF Education content on students’ mathematical understanding of exponents at SMP Negeri 1 Kolaka. This research employed a quantitative approach with a quasi-experimental design (post-test only control group), involving 48 eighth-grade students divided into an experimental and a control class. The experimental group learned using ALEF Education content integrated into classroom instruction, while the control group received conventional lessons without digital media. Data were collected through observations of teacher and student activities, as well as a mathematical comprehension test. The results showed that both teacher and student activities in the experimental class were higher (teachers: 84%; students: 80%) than in the control class (teachers: 81%; students: 72%). Students in the experimental group also achieved higher post-test scores (M = 19.54) than those in the control group (M = 19.48), and statistical analysis confirmed that the difference was significant at the 0.05 level. These findings indicate that ALEF Education content effectively improves students’ mathematical understanding and engagement in learning exponents. Integrating interactive and adaptive digital content into mathematics learning can thus serve as an innovative alternative to achieve meaningful and technology-enhanced learning outcomes in the 21st-century classroom.
PEDAGOGICAL CHANGE IN THE AI ERA: INDONESIAN EFL TEACHERS' VOICES AND CONTEXTUAL CONSTRAINT Rahmiati, Rahmiati; Al Tasa, Fiza Rauzika; Sanjaya, Muhammad Arif; Zulida, Evi; Hasrina, Noliza; Isda, Irma Dewi; Chairuddin, Chairuddin
Language Literacy: Journal of Linguistics, Literature, and Language Teaching Vol 9, No 2: December 2025
Publisher : Universitas Islam Sumatera Utara (UISU)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/ll.v1i1.12185

Abstract

This study examines how Indonesian English as Foreign Language (EFL) teachers perceive and negotiate pedagogical change arising from the integration of Artificial Intelligence (AI) into language instruction. This research uses an interpretive qualitative approach through semi-structured interviews with seven teachers from diverse institutional backgrounds in Sumatera. Thematic analysis identified six key themes: (1) pedagogical change through AI integration, (2) evolving teacher identity, (3) reflective professional agency, (4) contextual constraints, (5) students' engagement and critical awareness, and (6) the need for instructional support and teacher training. Findings indicate that AI tools, such as ChatGPT and Grammarly, have facilitated a shift toward more student-centered, project-based, and reflective teaching practices. Teachers reported a redefinition of their roles from content transmitters to facilitators and mentors, with an increasing emphasis on assessing learning processes rather than outcomes. However, AI integration was hindered by infrastructural limitations, unequal access to technology, and a lack of AI literacy. The study reveals that technological transformation in ELT is not merely technical but also shaped by contextual realities and teacher identity. It highlights the need for context-sensitive professional development and inclusive policy support that enhance teachers' adaptive capacities in an AI-mediated learning environment.
EXPLORING MATHEMATICS LEARNING PRACTICES AT SMA NEGERI 1 LALOLAE imelda, imelda; Tahir, Tahir; Chairuddin, Chairuddin; Karunia, Karunia
JME (Journal of Mathematics Education) Vol 10, No 2 (2025): JME (Jul - Dec)
Publisher : Universitas Sembilanbelas November Kolaka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31327/jme.v10i2.2535

Abstract

This study aims to analyze mathematics learning strategies at SMA Negeri 1 Lalolae by exploring teaching methods, learning media, and student responses to identify more effective strategies for improving learning quality. This study employed a qualitative descriptive approach with an exploratory design. Data were collected through classroom observations, interviews with mathematics teachers, and questionnaires completed by 80 students. The findings reveal that lecture and problem-solving methods are most preferred by students, whereas discussion and project-based approaches are still rarely applied. Visual media were found helpful in supporting understanding; however, the use of digital applications remained limited. Students generally responded positively to learning, although their active participation and conceptual understanding still need improvement. The study concludes that the application of varied and appropriate methods and media can foster active student engagement and improve motivation and understanding in learning mathematics.
Improving E-Sport Player Loyalty: An Overview of the Game Industry in JABOTABEK, Indonesia Widjaja, William; Samudra , Andika; Chairuddin; Rachman, Adryan; Alvita, Meilisa
Jurnal Nusantara Aplikasi Manajemen Bisnis Vol 9 No 2 (2024): Jurnal Nusantara Aplikasi Manajemen Bisnis
Publisher : UNIVERSITAS NUSANTARA PGRI KEDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/nusamba.v9i2.21176

Abstract

Research Aim: This study investigates the impact of experiential values ​​and promotional activities on player satisfaction, which affects player loyalty in the e-sports industry in the Jabodetabek area. Approach: This study uses the Structural Equation Modeling-Partial Least Squares (SEM-PLS) approach to test the proposed hypotheses and achieve the research objectives. Questionnaires were distributed to 100 respondents who identified as e-sports players in the Jabodetabek area. Research Findings: This study found that experiential values ​​have a positive and significant effect on player satisfaction in the e-sports industry in the Jabodetabek area. However, promotional activities do not significantly affect e-sports player satisfaction. This means that esports companies' promotional efforts may not significantly impact player satisfaction. Theoretical Contribution: This finding suggests that the theory of satisfaction on loyalty also applies to the Jabodetabek esports industry. Practical Implications: This study has significant practical implications for e-sports companies looking to enhance the value of the player experience by increasing the complexity of their games' features. Research Limitations: This study is limited to the Jabodetabek area and may not reflect the same conditions in other areas.
Exploring and analyzing mathematics learning activities through a constructivist approach: A case study Permatasari, Dwi; Tahir, Tahir; Chairuddin, Chairuddin
Psychology, Evaluation, and Technology in Educational Research Vol. 8 No. 1 (2025)
Publisher : Research and Social Study Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33292/petier.v8i1.310

Abstract

This study aims to explore and analyze the application of a constructivist approach in mathematics learning at SMA Negeri 1 Lalolae. The research employed a descriptive qualitative method with data triangulation through classroom observations, teacher interviews, and student questionnaires. The findings indicate that constructivist elements have been partially implemented, as reflected in classroom discussions, opportunities for students to express arguments, and activities that encourage independent problem solving. Students showed positive responses in terms of increased motivation and learning engagement, although some students remained passive and experienced difficulties in constructing concepts independently. In conclusion, the implementation of a constructivist approach in mathematics learning at SMA Negeri 1 Lalolae has not yet been optimal and requires support in the form of improved learning facilities and teacher training to enhance its effectiveness and sustainability.
Analisis Kemampuan Problem Solving Siswa pada Materi Eksponen Melalui PBL Berbasis Polya Rusyda Auliya; Tahir, Tahir; Chairuddin, Chairuddin; Erfina, Erfina
Square : Journal of Mathematics and Mathematics Education Vol. 7 No. 2 (2025)
Publisher : UIN Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study aims to analyze the problem-solving abilities of tenth-grade students at SMAN 1 Lalolae on the topic of exponents after the implementation of problem-based learning (PBL) with reference to Polya’s problem-solving stages. The background of this research is based on the limited number of studies that specifically examine students’ problem-solving skills in exponents through the application of PBL with a Polya-based approach. The research employed a descriptive qualitative method with ten students from SMAN 1 Lalolae selected using purposive sampling, representing high, medium, and low ability categories. Data were collected through problem-solving tasks on exponents and semi-structured interviews, then analyzed using Polya’s indicators, which include understanding the problem, devising a plan, carrying out the plan, and reviewing the solution. The findings indicate that high-ability students were able to solve problems systematically from understanding the problem to obtaining the correct solution, although the evaluation stage was not yet optimal. Medium-ability students were able to write down information and formulas but often struggled in selecting appropriate strategies, resulting in partially incorrect answers. Meanwhile, low-ability students encountered difficulties from the initial stage, demonstrated unclear strategies, and produced incorrect solutions.  The findings suggest the need to develop scaffolding strategies to support students with moderate and low levels of ability. The application of PBL was proven to enhance students’ engagement and problem-solving abilities, although evaluation and reflection aspects still need improvement.
Co-Authors Adryan Rachman Agus Kurniawan Akbar Nasrum Akob, Bachtiar Al Tasa, Fiza Rauzika Amirul Mukminin ANDIKA SAPUTRA Anwar Matondang, Saiful Arafah, Burhanuddin Arhita, Siska Asro Asro Aswin Aswin Ayu Asriani Baharudin Baharudin Bangun, Ahmad Darwin Bania, Allif Syahputra Cut Nuraini Dian Ulfa Sari Dwi Permatasari Efendi Barus, Efendi Erfina, Erfina Fairus, Fairus Faridy, Najihatul Farman, Farman Febrian , Fadri Febrian, Fadri Fitriyani Hali Fitriyani Hali Fitriyani Hali Fitriyani Hali, Fitriyani Gulton, Jamahir Guntur Arie Wibowo, Guntur Arie Halidin S.Pd., M.PMat Halidin, Halidin Hannani, Nabilah Harry Agusnar Hasrina, Noliza Herlina Herlina Herwanto, Patah Hidayati, Ully Husain, Dayana Sabila Husnaini, Nadia Indra Purnomo Irajuana Haidar Irma Dewi Isda Isra Djabbar Jahring Jumino Suhadi, Jumino Karunia, Karunia La Ode Sirad Manugeren, M Marbun, Roberta Maria Ulfa Marillah, Dima Marniati Marniati Marniati Marniati, Marniati Martins, Agus Meiliati, Rafika Meilisa Alvita Muhammad Fuad Muhammad Reza Muhammad, Dian Nasarudin Nasarudin Nasruddin Nasruddin Nasruddin Nasruddin Nisa Miftachurohmah Nuraini Nuraini Nurliza Lubis Nuzwaty, Nuzwaty Ovan Ovan Padri, Abdul Robi Perangin Angin, Elsa Sucita PURBA, NORA MARIHOT Purnama Sari, Riezky Rahmah Fithriani Rahmi, Ummi Rahmiati Rahmiati Rahmiati Ramadhan, Nur Ihsan Ridhonul Rahman Rinda Rini Mastuti Rusyda Auliya Salido, Achmad Samudra , Andika Sanjani, Ade Riska Sanjaya, Muhammad Arif Sari, Dian Ulfa Sari, Dian Ulfa Sarimuddin, Sarimuddin Setiana, Diana Sinaga, Sorbakti sirad, La Ode Siwi, Purwanto Sufri Mashuri Surlam, Ananda Eka Puspita Susanti, Gemi Syukur, Moh Rezky Tahir Tahir Tahir Tahir Tahir, Tahir Tasni, Nurfaida Tia, Elis Wilda Purnama Sari William Widjaja Zulida, Evi