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All Journal E-Dimas: Jurnal Pengabdian kepada Masyarakat REiD (Research and Evaluation in Education) INDONESIAN JOURNAL OF APPLIED PHYSICS Indonesian Physical Review PIKAT Khidmatuna: Journal of Research and Community Service Journal on Mathematics Education
Septiana, Atut Reni
Department Of Physics, Institut Teknologi Kalimantan
Humanities Astronomy Computer Science & IT Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Efek Penggunaan Cairan Ionik sebagai Aditif terhadap Konduktivitas Ionik Elektrolit Baterai Ion Litium Atut Reni Septiana; Evvy Kartini; Wagiyo Honggowiranto; Sudaryanto Sudaryanto; Rahmat Hidayat
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (434.136 KB) | DOI: 10.13057/ijap.v9i02.31700

Abstract

Teknologi baterai litium ion merupakan alternatif penyuplai energi pada peralatan portabel, divais elektronik, dan aplikasi tenaga tinggi seperti kendaraan listrik dan penyimpanan daya untuk energi terbarukan. Pada baterai litium ion, elektrolit memainkan peranan penting pada performa baterai. Elektrolit baterai litium ion, pada umumnya terdiri dari garam litium yang dilarutkan dalam pelarut organik dan aditif. Namun, LiPF6 tidak stabil secara termal dan mempengaruhi performa baterai secara signifikan. Selain itu, pelarut standar (konvensional) juga memiliki beberapa kekurangan jika diaplikasikan pada kendaraan listrik. Terkait dengan masalah tersebut, penggunaan elektrolit jenis lainnya, yakni garam litium, seperti lithium bis (trifluoromethylsulfonyl) imide (LiTFSI) yang dapat dikombinasikan dengan cairan ionik menjadi sangat penting untuk dikaji. Oleh karena itu, dalam penelitian ini telah dikaji karakteristik konduktivitas ionik elektrolit berbasis LiTFSI. Pengukuran konduktivitas ionik elektrolit (LiTFSI) dalam pelarut karbonat dengan dan tanpa cairan ionik BMIMTFSI sebagai aditif telah dilakukan. Konduktivitas ionik elektrolit LiTFSI dalam pelarut karbonat dengan tambahan cairan ionik lebih tinggi dibandingkan LiTFSI tanpa tambahan cairan ionik, masing-masing yaitu 3.1 mS/cm and 2.7 mS/cm.
Pelatihan Pengelolaan Learning Management System di SDN 012 Balikpapan Utara dalam Meningkatkan Kualitas Pembelajaran di Era Covid-19 Atut Reni Septiana; Dian Mart Shoodiqin; Menasita Mayantasari; Yohanes Dwi Saputra; Rahmania Rahmania
E-Dimas: Jurnal Pengabdian kepada Masyarakat Vol 14, No 1 (2023): E-DIMAS
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/e-dimas.v14i1.6800

Abstract

SDN 012 Balikpapan Utara terletak di Jalan Giri Mulyo KM 14 RT 22 Kelurahan Karang Joang, Balikpapan Utara. Program pengabdian kepada masyarakat ini dilandasi oleh permasalahan yang terjadi di pihak mitra yaitu SDN 012 Balikpapan Utara. Adanya pandemi covid-19 mengharuskan para siswa belajar dari rumah. Di sisi lain, para guru di SDN 012 Balikpapan Utara menghadapi beberapa tantangan mengenai pembelajaran daring. Mereka belum menguasai penggunaan learning management system dalam pembelajaran daring. Sebelumnya mereka terbiasa menggunakan Whatsapp sebagai media pembelajaran online, namun saat ini Whatsapp tidak bisa digunakan sebagai satu-satunya media pembelajaran daring. Untuk mengatasi permasalahan tersebut, kami mengenalkan dan melakukan pelatihan penggunaan aplikasi atau teknologi yang mendukung pembelajaran daring. Media yang digunakan dalam hal ini adalah google classroom, google form dan google meet. Pada kegiatan ini, kami juga melakukan klinik privat pelatihan bagi para guru yang ingin mempelajari materi pelatihan lebih dalam. Pelatihan ini melibatkan 11 guru sebagai peserta dan 5 pemateri dari dosen yang dibantu oleh 6 mahasiswa. Dari hasil survey yang sudah dilakukan, semua guru merasakan banyak manfaat dengan adanya kegiatan ini. Pengetahuan mereka tentang learning management system untuk pembelajaran daring pun meningkat. Para guru pun dapat melakukan pembelajaran dengan lebih baik dan mudah.
PEMBELAJARAN IPA DENGAN METODE PENDEKATAN DISCOVERY PADA SISWA DI SDN 012 BALIKPAPAN UTARA Dian Mart Shoodiqin; Menasita Mayantasari; Febrian Dedi Sastrawan; Fadli Robiandi; Atut Reni Septiana
Jurnal Pengabdian Kepada Masyarakat ITK (PIKAT) Vol. 1 No. 1 (2020): Jurnal Pengabdian Kepada Masyarakat
Publisher : LPPM Institut Teknologi Kalimantan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (621.564 KB) | DOI: 10.35718/pikat.v1i1.290

Abstract

SDN 012 Balikpapan Utara terletak di Jalan Giri Mulyo KM 14 RT 22 Kelurahan Karang Joang, Balikpapan Utara. Selama ini, pembelajaran IPA di SDN 012 Balikpapan Utara menggunakan pendekatan pembelajaran konvensional atau strategi pembelajaran tradisional di mana guru mentransformasi ilmu pengetahuannya dengan menggunakan metode ceramah dan pembelajaran berpusat pada guru (teacher centered). Pada pengabdian ini, kami membantu pihak sekolah SDN 012 Balikpapan Utara untuk memberikan pembelajaran IPA dengan metode pendekatan pembelajaran discovery. Dengan metode pembelajaran yang menarik diharapkan siswa lebih mudah dalam memahami materi. Kegiatan pembelajaran dengan metode discovery ini diberikan pada siswa Kelas VI SDN 012 Balikpapan Utara. Ada tiga tahap kegiatan yang dilakukan pada pengabdian kepada masyarakat ini, yaitu tahap perencanaan, pelaksanaan, dan refleksi. Berdasarkan hasil kegiatan yang telah dilakukan, terlihat bahwa kegiatan pembelajaran IPA dengan metode discovery menunjukkan peningkatan pemahaman materi IPA pada siswa Kelas VI di SDN 012 Balikpapan Utara. Selain itu, siswa mengikuti kegiatan pembelajaran dengan antusias dan selalu terlibat aktif dalam setiap aktivitas proses pembelajaran.
Comparison of item characteristic analysis models of reading literacy test with polytomous Item Response Theory Harsana, Firyal Nabila; Retnawati, Heri; Dewanti, Septinda Rima; Lumenyela, Rogers Andrew; Sotlikova, Rimajon; Adzima, Maulana Fatahillah; Septiana, Atut Reni
REID (Research and Evaluation in Education) Vol. 10 No. 2 (2024)
Publisher : Graduate School of Universitas Negeri Yogyakarta & Himpunan Evaluasi Pendidikan Indonesia (HEPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/reid.v10i2.77852

Abstract

This study aims to compare the analysis model of the characteristics of reading literacy items with the polytomous item response theory, which uses the Graded Response Model (GRM), Partial Credit Model (PCM), Generalized Partial Credit Model (GPCM), and Nominal Reasons Model (NRM). This research is quantitative research in nature, and secondary data were used from about 1000 test takers' responses to reading literacy items in the 2018 reading literacy study analyzed with the R program. This model comparison was carried out so that the analysis results obtained were more accurate in representing the level of reading literacy skills in Indonesia. The results show that the GPCM model is the fit model with an AIC value of 23753.89 and a BIC value of 24042.45, and the number of suitable testlets is 7 out of a total of 7 testlets. Based on the relationship between information function scores and SEM, reading literacy items provide higher information when participants' abilities range between -2.3 and +2.
The Training of Physics Olympiad for Students at SMA IT Al-Auliya Balikpapan Shoodiqin, Dian Mart; Febrian Dedi Sastrawan; Meidi Arisalwadi; Atut Reni Septiana; Rahmania
Khidmatuna (Jurnal Pengabdian Kepada Masyarakat) Vol 2 No 2 (2023): May
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58330/khidmatuna.v3i1.382

Abstract

The Capital City of Indonesia will be moved from Jakarta to Penajam Paser Utara, East Kalimantan. Balikpapan, as the nearest big city from Penajam Paser Utara, has a huge potential in the development of science and technology in the future. However, achieving greater potential requires dedication, effort and hard work. Through this community service activity, it is expected that the enthusiasm of the young generation, especially high school students, related to the world of science (Physics) will increase. In this activity, the community engagement team provides a training regarding problem solving to physics olympaid question. Lecturing (material enrichment) and group discussion (answering examples of Physics Olympiad questions) methods were used in this activity. The result shows that the students’ ability in problem solving skill increased. It can be seen from the pre-test and post-test scores. Furthermore, one of the trained students won the competition in city level, Balikpapan City, and had a chance to join the competition in province level. Based on the result, Balikpapan's young generation has an enermous potential to develop science and technology. Hopefully, in the future this activity can be held in a wider and sustainable scope.
Mathematical reasoning and communication word problems with mathematical problem-solving orientation: A relation between the skills Aljura, Ahmad Naufal; Retnawati, Heri; Dewanti, Septinda Rima; Kassymova, Gulzhaina Kuralbayevna; Sotlikova, Rimajon; Septiana, Atut Reni
Journal on Mathematics Education Vol. 16 No. 2 (2025): Journal on Mathematics Education
Publisher : Universitas Sriwijaya in collaboration with Indonesian Mathematical Society (IndoMS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22342/jme.v16i2.pp529-558

Abstract

Developing students’ mathematical reasoning skills (MRS) and mathematical communication skills (MCS) is crucial, as both are foundational to effective mathematical problem-solving (MPS). Despite their theoretical interconnectedness, limited empirical evidence exists on how MRS and MCS relate to MPS, particularly in problem-based contexts. This study investigates the relationship between MRS and MCS within an MPS-oriented framework using a quantitative, descriptive correlational design. A modified mathematical word problem (MWP) essay test was administered to 117 students across two pilot classes. The test items were designed to elicit reasoning and communication processes associated with MPS. Psychometric analyses—including evidence of content validity (Aiken’s V), consequential validity, reliability indices (α and ω), and item-level metrics (discrimination and difficulty)—confirmed the instrument’s robustness. Factor analysis supported a unidimensional structure aligned with MPS. Correlational analyses revealed significant positive associations between MRS and MCS, meeting bivariate normality assumptions. Pearson’s r was 0.529 (95% CI: 0.261–0.722), Spearman’s ρ was 0.493 (95% CI: 0.215–0.697), and Kendall’s τ was 0.400 (95% CI: 0.101–0.632), indicating a strong relationship. These findings underscore the interdependence of reasoning and communication skills in the context of MPS. The study also offers a detailed analysis of student obstacles in solving MWPs, offering a nuanced understanding of cognitive and linguistic dimensions in MPS. Implications are discussed for researchers, policymakers, and educators, particularly in designing instructional interventions that strengthen MRS and MCS in support of MPS.
APLIKASI METODE SELF-POTENTIAL UNTUK PEMETAAN BAWAH PERMUKAAN DI AREA KAMPUS ITK Arisalwadi, Meidi; Cahyani, Rori Shanaz; Septiana, Atut Reni; Rahmania, Rahmania; Sastrawan, Febrian Dedi
Indonesian Physical Review Vol. 3 No. 3 (2020)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v3i3.65

Abstract

Identified subsurface composition remains one of the important things in development, such as finds out potential that is below the surface, this research in Institut Teknologi Kalimantan Campus (ITK). This study aims to identify distribute potential values and finds out the source of anomalies in the ITK Campus area. This study uses the Self-Potential method with a fixed-base technique. The data obtained in the form of potential difference (delta V) data, base potential data and measurement point coordinates. The data was corrected by daily base variation, daily correction and reference correction. After obtaining a potential value from the correction at each measurement point, the data processing was done using surfer 11 software. The results of data processing were obtained isopotential contour map and qualitative interpretation which could be seen distribution of potential different values. On the isopotential contour map, slicing of two cross sections selected indicates the source of anomaly. Anomalous potential values of 45 mV to -55 mV indicated anomalous sources namely electrolyte potential in groundwater with positive anomaly values negative up to hundreds of mV. And, there was a potential for a liquid flowwith a positive and negative anomaly ≤ 100 mV
SINTESIS DAN KARAKTERISASI KARBON AKTIF DARI PREKURSOR BATUBARA Septiana, Atut Reni; Teluma, Yosef Christian Riki; Rifani, Agus
Indonesian Physical Review Vol. 5 No. 1 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i1.121

Abstract

In this work, coal derived activated carbon has been synthesized successfully. The activated carbon was prepared by soaking coal powder in KOH solution and continued by activation at varied temperature, i.e. 400, 500, and 600ËšC. The performance of the activated carbon was examined by X-Ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), moisture content, and iodine adsorption. The XRD data analysis results indicated the amorphous structure of carbon and revealed the more amorphous carbon as the higher of the activation temperature. The characterization using FTIR exhibited the presence of functional groups such as hydroxyl, carboxylic acid, ketone, amino, and so on. The lowest moisture content was achieved by activated carbon which was activated at 400ËšC, namely 3.77%, while the moisture content for activation temperature at 500 and 600ËšC were 5.3 and 7.74 % respectively. Moreover, the adsorption of iodine increased by the increase of the activation temperature due to high pore surfaces of the activated carbon
Co-Authors Adzima, Maulana Fatahillah Aljura, Ahmad Naufal Cahyani, Rori Shanaz Evvy Kartini Fadli Robiandi Febrian Dedi Sastrawan Harsana, Firyal Nabila Heri Retnawati Kassymova, Gulzhaina Kuralbayevna Lumenyela, Rogers Andrew Meidi Arisalwadi Meidi Arisalwadi Menasita Mayantasari Menasita Mayantasari Rahmania Rahmania Rahmania Rahmat Hidayat Rifani, Agus Sastrawan, Febrian Dedi Septinda Rima Dewanti shoodiqin, dian mart Sotlikova, Rimajon Sudaryanto Sudaryanto Teluma, Yosef Christian Riki Wagiyo Honggowiranto Yohanes Dwi Saputra