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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences INDONESIAN JOURNAL OF APPLIED PHYSICS Al-MARSHAD: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan Journal of Environmental Science and Sustainable Development Didaktika: Jurnal Kependidikan ALACRITY : Journal Of Education Elementary School: Jurnal Pendidikan dan Pembelajaran ke-SD-an Time in Physics: Journal for Theoretical, Instrumentation, Material-Molecular, and Education Physics EDUCARE: Journal of Primary Education
Ariefka, Reza
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Humanities Astronomy Earth & Planetary Sciences Education Energy Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Capacitance Value Analysis of Composites of Activated Cashew Shells Charcoal and Iron Sand Muhammad Anas; Vivi Hastuti Rufa Mongkito; Mardiana Napirah; Suritno Fayanto; Amiruddin Takda; Reza Ariefka
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.59494

Abstract

This study aims to determine the use of iron sand extract and cashew nut shell activated charcoal in the capacitor manufacturing process and determine the effect of grain size on the capacitor capacitance with electrodes from a composite of iron sand extraction and activated charcoal from cashew nutshells. The sample preparation of cashew nutshell activated charcoal was carried out by carbonation and activation methods at a temperature of 700 0C and continued by extracting iron sand. The results of the iron sand extract were then crushed using a mortar, followed by varying the mass fraction of iron sand starting at 40%, 60%, and 80% for each particle size (60 mesh, 100 mesh, and 200 mesh). Then composite the iron sand extract and activated charcoal mixed for 4 hours, and added 0.7 mL of LiNO3 1M solution. The analysis showed that the highest specific capacitance was found in the 200 mesh grain size, namely 0.0695 F/g.
Predicting Ocean Current Temperature Off the East Coast of America with XGBoost and Random Forest Algorithms Using Rstudio Alfaris, Lulut; Firdaus, Anas Noor; Nyuswantoro, Ukta Indra; Siagian, Ruben Cornelius; Muhammad, Aldi Cahya; Hassan, Rohana; Aunzo, Jr., Rodulfo T.; Ariefka, Reza
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 2 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.2.273-284

Abstract

This research investigates the comparative predictive efficacy of two leading machine learning methodologies, specifically the XGBoost and Random Forest models, in estimating ocean temperature dynamics in the TS Gulf Stream and Labrador Current regions along the east coast of North America. Using annual temperature datasets and relevant oceanographic parameters, the data is carefully processed, cleaned and sorted into training and test subsets via the RStudio Platform. The performance evaluation model is carried out using predetermined machine learning assessment criteria, including Mean Absolute Error (MAE), Root Mean Squared Error (RMSE), Mean Squared Error (MSE), and R-squared. The results show the superiority of the XGBoost model compared to Random Forest in terms of prediction accuracy and minimizing prediction errors. The XGBoost model shows lower MSE values and higher R-squared values than the Random Forest model, indicating its better capacity in explaining data variations. XGBoost consistently provides more accurate predictions and shows higher sensitivity in identifying important factors influencing ocean temperature fluctuations than Random Forest. This research significantly improves understanding and prognostic capabilities regarding ocean temperature dynamics in the TS Gulf Stream and Labrador Current regions. Empirical evidence underlines the efficacy of the XGBoost model in predicting ocean temperatures in the studied region. Continuous model evaluation and parameter refinement for both methodologies is critical to establishing standards for optimal prediction performance. The findings of this research have implications for the fields of oceanography and climate science, and offer potential pathways to comprehensively understand and mitigate the impacts of climate change on marine ecosystems.
Exploring Celestial Object Characteristics: An In-depth Analysis of Quasars, Stars, and White Dwarfs Using the Sloan Digital Sky Survey (SDSS) Dataset Siagian, Ruben Cornelius; Nurahman, Arip; Sinaga, Goldberd Harmuda Duva; Ariefka, Reza; Pribadi, Pandu
TIME in Physics Vol. 2 No. 1 (2024): March
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2024.v2i1p1-16

Abstract

This research utilizes the Sloan Digital Sky Survey (SDSS) dataset, examining 12,884 observations to explore quasars, stars, and white dwarf objects. Magnitude data and coordinates across five filter bands are analyzed, revealing unique features through statistical methods. The identification of 77,429 quasars with 15 dimensions enhances the dataset. Thorough analyses of stellar and white dwarf classes, coupled with visualization techniques, unveil variable relationships. Residual validation and Gaussian kernel density plots confirm significant class differences. Non-linear regression and a normal distribution mixture model depict complex variable relationships. A parallel coordinates plot aids in interpreting data patterns, while predictive modeling via regression exposes meaningful coefficients. Logistic regression effectively classifies astronomical objects in the SDSS training data. This research contributes to understanding celestial object characteristics, offering valuable insights for astronomers and astrophysicists in analyzing large-scale astronomical datasets.
Augmented Reality in Solar System Learning at Primary School Level in Indonesia: A systematic literature review Ariefka, Reza; Fauziah, Rosynanda Nur; Saputri, Agatha
Al-Marshad: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan Vol 9, No 2 (2023): Al-Marshad
Publisher : University of Muhammadiyah Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/jam.v9i2.16504

Abstract

A systematic review of the use of AR in learning about the solar system in primary schools in Indonesia was conducted. This review identified 25 articles using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) framework. We examined the tools used to develop AR, the type of AR used, the focus of the research, and the benefits of AR for solar system learning. Our findings show that the most commonly used tool for developing AR is Unity, and the most popular type of AR used is marker-based AR. Most of the research focuses on development and only a few on effectiveness and implementation. The use of AR is known to improve learning outcomes, critical thinking skills, scientific literacy, visual spatial skills and student curiosity. This systematic review provides researchers and educators with avenues for future research.
The Effect of Problem Based-Learning Based on Science Edutainment on Students’ Logical Thinking Ariefka, Reza; Sari, Sasmita
EDUCARE: Journal of Primary Education Vol. 4 No. 1 (2023): EDUCARE: Journal of Primary Education
Publisher : Fakultas Tarbiyah dan Ilmu Keguruan Universitas Islam Negeri Kiai Haji Achmad Siddiq Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35719/educare.v4i1.199

Abstract

The problem-based learning model based on science edutainment, presents a problem in each concept of game-based material. The main characteristic of the learning model used in this study is using games to help students understand problem-based material in an entertaining way. This study aimed to examine the effect of the problem based-learning based on science edutainment in scientific content on students’ logical thinking. The type of research used in this research is quantitative research. This study had conducted in class IV of 45 students at SD Negeri Buay Pemaca. Data collection techniques included interviews, observation, documentation, and tests. Based on statistical tests, the independent sample t-test showed a significant value of 0.000 > 0.05, meaning that the science edutainment problem based-learning model had influenced students' logical thinking. The conclusion of this study is that the problem-based learning model based on science edutainment in science lessons has an effect on the logical thinking abilities of fourth grade elementary school students.
Pengaruh Penggunaan Alat Peraga Pembentukan Urine Terhadap Kemampuan Literasi Sains Siswa SD Anggreni, Monica; Ariefka, Reza
ALACRITY : Journal of Education Volume 5 Nomor 1 Februari 2025
Publisher : LPPPI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52121/alacrity.v5i1.654

Abstract

In Indonesia, according to the 2022 PISA results, students' scientific literacy is in a low category, equivalent to the results obtained in 2006, and is ranked 68th out of 81 countries. Based on existing problems, innovation is needed to increase scientific literacy, one of which is using science teaching aids. This research examines the effect of using urine formation teaching aids on the scientific literacy abilities of grade IV students at SDN 2 Riang Bandung. In this research, the method used is a quantitative method in which the research experiments with a one-group pretest-posttest design, and the data collection techniques are in the form of observation, tests, and documentation. The data processing technique was obtained through test instrument testing and hypothesis testing. From processing this data, the normality test value was obtained, which had a pretest value of 0.171, then the post-test value was 0.051, which stated that the value was normal. Then the homogeneity test which has a pretest value of 0.075 which is explained that the value is greater than 0.05 which is stated that the value is homogeneous. Finally, the paired sample t-test has a pretest value of 0.000, which means the value is smaller than 0.05. Thus it can be stated that the null hypothesis value (Ho) is rejected and the hypothesis (Ha) is accepted. Hypothesis testing proves that using urine formation props on the scientific literacy skills of elementary school students has a great influence on class IV of SDN 2 Riang Bandung.           
Pengaruh Penggunaan Alat Peraga Tata Surya Terhadap Kemampuan Literasi Sains Siswa SD Prasetya Suseno, Bima; Ariefka, Reza
Elementary School: Jurnal Pendidikan dan Pembelajaran ke-SD-an Vol. 12 No. 1 (2025): ELEMENTARY SCHOOL (Jurnal Pendidikan dan Pembelajaran Ke-SD-an)
Publisher : Universitas PGRI Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31316/esjurnal.v12i1.4440

Abstract

Di Indonesia, menurut hasil PISA 2022 untuk literasi sains siswa termasuk dalam kategori rendah, setara dengan hasil yang diperoleh pada pada 2006 lalu dan berada di peringkat 68 dari 81 negara. Berdasarkan masalah tersebut, diperlukan inovasi untuk meningkatkan literasi sains siswa salah satunya adalah penggunaan alat peraga sains. Dalam penelitian ini bertujuan untuk mengkaji pengaruh penggunaan alat peraga tata surya terhadap kemampuan literasi sains siswa kelas VI di SDN Tepungsari. Metode penelitian yang akan digunakan pada penelitian ini adalah pre-eksperimen. Sampel dalam penelitian ini 24 siswa kelas VI. Desain penelitian yang digunakan adalah One-Group Pretest-Posttest Design. Teknik pengumpulan data menggunakan observasi, tes dan dokumentasi. Teknik analisis data melalui uji instrumen tes dan uji hipotesis. Dari pengolahan data diperoleh nilai uji normalitas Shapiro wilk dengan nilai pretest diperoleh nilai sebesar 0,070, dengan nilai posttest sebesar 0,109 dan uji paired sample t-test dieroleh nilai sebesar 0,000 yang berarti lebih kecil dari nilai sig 0,05, dengan demikian dapat dinyatakan hipotesis nol (Ho) ditolak dan hipotesis alternatif (Ha) diterima. Pengujian hipotesis membuktikan bahwa penggunaan alat peraga berpengaruh terhadap peningkatan literasi sains kelas VI SDN Tepungsari.
Pengaruh Model Pictorial Riddle Berbantuan Aplikasi Canva Terhadap Kemampuan Literasi Sains Siswa SD Materi Sifat-Sifat Benda Ariefka, Reza; Ariyanti, Etika
ALACRITY : Journal of Education Volume 5 Nomor 1 Februari 2025
Publisher : LPPPI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52121/alacrity.v5i1.704

Abstract

This study aims to analyze the effect of the Pictorial Riddle learning model assisted by the Canva application on the scientific literacy skills of elementary school students on the material properties of objects. This study uses a quantitative method with a True Experimental Design. The research sample consisted of 22 fifth-grade students of SD Negeri 1 Karang Melati, which were divided into an experimental class (11 students) and a control class (11 students). The pre-test results showed an average score of 55.63 in the experimental class and 51.81 in the control class. After treatment, the post-test results increased to 73.18 in the experimental class and 61.81 in the control class. The Paired Sample T-Test test showed a significant difference between the pre-test and post-test with a sig. Value of 0.001 (<0.05), while the Independent Sample T-Test test showed a significant difference between the experimental and control classes with a sig. Value of 0.000 (<0.05). The results of this study indicate that the Pictorial Riddle model assisted by Canva significantly improves students' scientific literacy skills.
Pengaruh Model Pembelajaran Project Based Learning Terhadap Pemahaman Konsep IPA Siswa Sekolah Dasar Aryani, Eka; Ariefka, Reza
ALACRITY : Journal of Education Volume 5 Nomor 1 Februari 2025
Publisher : LPPPI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52121/alacrity.v5i1.705

Abstract

This study aims to determine the significant effect of using the Project Based Learning learning model on students' understanding of science concepts in elementary schools. The research method used is an experiment (quasi-experiment) with a non-equivalent control group design. The population in this study were all fourth-grade students of SDN 5 Kampung Baru. The research sample used was 50 students, namely 25 students of class IV A and 25 of class IV B. The data collection technique used was a multiple-choice test. The results of this study were obtained through the Independent Sample T-test or hypothesis test with a significance value of <,001. Based on the results of these values, it can be concluded that the probability of significance <0.05 so that H_a is accepted and H_o is rejected. From these results, it can be concluded that the project-based learning model has an effect on the understanding of science concepts of fourth-grade students at SDN 5 Kampung Baru.
Pengaruh Model Pembelajaran Carousel Feedback Terhadap Kemampuan Literasi Sains Mata Pelajaran IPA Kelas 3 Sekolah Dasar Aryani, Devi; Ariefka, Reza
ALACRITY : Journal of Education Volume 5 Nomor 1 Februari 2025
Publisher : LPPPI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52121/alacrity.v5i1.706

Abstract

This study aims to analyze the effect of the Carousel Feedback learning model on the scientific literacy skills of grade 3 students of Rejodadi Elementary School in science subjects. The research method used is pre-experiment design with a One-Group Pretest-Posttest. The research sample consisted of 23 students selected through probability sampling techniques. The research instrument was a science literacy test that had been tested for validity and reliability. The results showed a significant increase in students' average scores, from 57.17 (pretest) to 68.26 (posttest). The Paired Sample T-Test statistical test showed a significance value of 0.000 (<0.05), which indicated a significant effect of the Carousel Feedback learning model on students' scientific literacy. Thus, this learning model can be an effective alternative to improving scientific literacy in elementary schools.
Co-Authors Aditya, Reviyanti Agatha Saputri Aldi Cahya Muhammad Amiruddin Takda Anggreni, Monica Ariyanti, Etika Aryani, Devi Aunzo, Jr., Rodulfo T. Eka Aryani, Eka Fauziah, Rosynanda Nur Firdaus, Anas Noor Goldbert Harmuda Duva Sinaga Hassan, Rohana Karim, Mohammad Alfin Khafidotul Khoriyah Lulut Alfaris Mardiana Napirah Muhammad Anas Nurahman, Arip Nyuswantoro, Ukta Indra Prasetya Suseno, Bima Pribadi, Pandu Rahdiana, Nana Rosely, Annisa Sahroni, Taufik Roni, Mr. Sari, Sasmita Sasmita Sari Siagian, Ruben Cornelius Suhara, Ade Suritno Fayanto Vivi Hastuti Rufa Mongkito Yasin, Verdi