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All Journal VALENSI Jurnal Periodic Jurusan Kimia UNP Sainstek Jurnal Penelitian dan Pembelajaran Fisika Jurnal Pengajaran MIPA Jurnal Pendidikan IPA Indonesia Jurnal Sosioteknologi Setrum : Sistem Kendali-Tenaga-elektronika-telekomunikasi-komputer Jurnal Pendidikan Biologi Indonesia JOIV : International Journal on Informatics Visualization INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Jurnal Penelitian Pendidikan IPA (JPPIPA) Momentum: Physics Education Journal Spektra: Jurnal Fisika dan Aplikasinya JSKK (Jurnal Sains Keolahragaan dan Kesehatan) JURNAL EKSAKTA PENDIDIKAN (JEP) Bio-Lectura Kwangsan: Jurnal Teknologi Pendidikan Eksakta : Berkala Ilmiah Bidang MIPA Al-Ta'lim Pelita Eksakta Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Sainstek : Jurnal Sains dan Teknologi Indonesian Journal of Electrical Engineering and Computer Science Studies in Learning and Teaching Wahana Dedikasi : Jurnal PkM Ilmu Kependidikan Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram JURNAL MUARA PENDIDIKAN JRFES Jurnal Pengabdian Masyarakat Olahraga dan Kesehatan Journal of Experimental and Applied Physics
Yohandri
Department Of Physic, Universitas Negeri Padang
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Other

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Preparation of Thin Film CuSnO3 by Dip Coating Method: Structural, Optical, and Electrical Properties for Dye-Sensitized Solar Cell Applications Hary Sanjaya; Hermansyah Aziz; Yeni Stiadi; Syukri Arief; Yohandri Yohandri; Septian Budiman
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.50326

Abstract

This study addresses the critical need for cost-effective, earth-abundant alternatives to Indium Tin Oxide (ITO) by developing transparent and conductive Copper Stannate (CuSnO₃) thin films via sol-gel dip-coating. Using diethanolamine (DEA) and monoethanolamine (MEA) as chelating agents to enhance film stability and uniformity, the synthesized films were calcined at 550 °C, yielding predominantly amorphous structures that minimize grain boundary recombination. Characterization revealed crack-free morphologies with a thickness of approximately 1.88 μm, while optical analysis showed band gap energies ranging from 2.16 eV (DEA) to 2.31 eV (MEA), suitable for visible-light absorption. Electrical measurements indicated significant improvements in conductivity, with MEA-modified films achieving 173.58 S/m and DEA-modified films reaching 3600 S/m.When used as photoelectrodes in Dye-Sensitized Solar Cells (DSSCs) with natural sensitizers, the films demonstrated successful photovoltaic performance, with Quercetin yielding the highest power conversion efficiency of 0.26%, thereby validating solution-processed amorphous CuSnO₃ as a viable, low-cost material for scalable optoelectronic applications.
Prediction of Tropical Cyclone Trajectory and Intensity Using a Particle Motion Based Machine Learning Framework in the Southern Indian Budi Iman Samiaji; Yulkifli Yulkifli; Yohandri Yohandri; Nofi Yendri Sudiar; Supari Supari
Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol. 14 No. 2: April 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/j-ps.v14i2.19982

Abstract

Tropical cyclones in the Southern Indian Ocean pose severe threats to coastal infrastructure and socio-economic stability, yet predicting their recurving trajectories and intensity remains a significant meteorological challenge. This study evaluates the performance of a particle-motion-based machine learning framework, utilizing the Trackpy library, to forecast cyclone behavior. Leveraging historical data from 2018 to 2025 (JTWC and IBTrACS), the model treats cyclones as physical particles with temporal inertia, employing a multi-lag feature to capture movement momentum. Evaluation using a dataset of 115 cyclones (78:22 train/test ratio) reveals that the Trackpy framework achieves high spatial precision, with Mean Squared Error (MSE) values of 0.1728 for latitude (±33.3 km) and 1.0250 for longitude (±53.2 km). While the intensity prediction yielded a higher MSE of 47.7544 (approximately 6.9-knot deviation), the model successfully captured major strengthening and weakening phases across prominent cyclones, including TC Wallace and TC Neville. These findings demonstrate that integrating temporal inertia is highly effective for maintaining trajectory consistency, establishing Trackpy as a robust architectural foundation for operational forecasting. Further optimization via hybrid models and additional meteorological variables is recommended to enhance intensity accuracy.
Research Trends of Problem Based Learning (PBL) Model in Science Courses in Universities Media Roza; Minda Azhar; Yohandri Yohandri; Fitri Arsih
AT-TA'LIM Vol 30, No 1 (2023)
Publisher : Institut Agama Islam Negeri Imam Bonjol Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15548/jt.v30i1.761

Abstract

The PBL model has relevance and potential in developing 21st-century skills. This study uses the Systematic Literature Review method to identify PBL research trends in science courses at universities. A literature search using the app Publish or Perish with the Scopus database and data from journals indexed by SINTA (Science and Technology Index) in the last 10 years, from 2012 to 2021. In this study, there are 32 articles about PBL research in science lectures, including physics, chemistry, biology, and natural science.  The trend seen is a rise in publications addressing various facets of critical thinking abilities. Among research publications, quantitative research is the most common type. Quasi-Experimental designs are most often chosen by researchers, while RD designs are still little used. Chemistry is a subject that is most often chosen as a research subject. Meanwhile, the test is the most commonly used instrument for collecting data on 21st-century student skills
An Infusion Monitoring System With An Internet Of Things Based On Smartphone Naurah Nazhifah; Yohandri Yohandri
Journal of Experimental and Applied Physics Vol 3 No 4 (2025): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i4.158

Abstract

Infusion is one of the most frequently used medical mechanisms as a therapeutic. The volume of infusion fluid, when not monitored regularly, can harm the patient. When the infusion fluid has run out and is not immediately replaced, the air will enter the blood vessels. Infusion monitoring in Indonesia is still done manually. Previous research has developed an infusion monitoring device using Arduino however, this device generally lacks remote monitoring capabilities, thus tending to use microcontrollers inefficiently. To address these issues, an Infusion monitoring system was designed using the NodeMCU ESP8266. This device reads the number of infusion fluid drops using an Optocoupler sensor, and a Load cell sensor measures the percentage of remaining fluid. Measurement results can be detected easily and quickly via a smartphone. The innovation in this system lies in the Internet of Things (IoT), which enables remote control. The research conducted was to determine the design specifications and performance specifications of the device. This can be seen from the results of the device design specifications, namely the average accuracy of the infusion rate of the number of drops/minute is 98.89% with an average accuracy of 98%, while the average accuracy of the remaining infusion fluid percentage is 96.8% with an average accuracy of 98%. This system offers an efficient and controlled solution for combining infusion fluids. By integrating IoT technology, this research paves the way for the development of more advanced infusion monitoring systems, supporting improved patient care in the era of global healthcare
Development of physics e-module based on integrated project-based learning model with Ethno-STEM approach on smartphones for senior high school students Yulkifli Yulkifli; Yohandri Yohandri; Hasbi Azis
Momentum: Physics Education Journal Vol. 6 No. 1 (2022)
Publisher : Universitas PGRI Kanjuruhan Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21067/mpej.v6i1.6316

Abstract

Standard competency of graduate students of class XI in Physics learning is considered not optimal. One of the contributing factors is the unavailability of the Physics E-Module, which contains model steps and is integrated with a learning approach in order to direct students in active learning. This study aims to produce a Physics E-Module based on an integrated project-based learning model with an Ethno-STEM approach on smartphones for class XI high school students with valid, practical, and effective criteria. This is development research using the Plomp development model consisting of three stages: Preliminary Research, Development or Prototyping Phase, and Assessment Phase. The instruments used in this research include three questionnaires for preliminary study, validity and practicality, attitude observation sheets, written test sheets, and skills assessment sheets. The result obtained was a Physics E-Module based on an integrated project-based learning model with the Ethno-STEM approach on smartphones for class XI high school students who meet valid, practical, and effective criteria.
Peningkatan Income Genereting Melalui Pemanfaatan Pusat Layananan Pegnukuran kondisi fisik Nurul Ihsan; Anton Komaini; Yohandri Yohandri; Yulhendri Yulhendri
JURNAL PENGABDIAN MASYARAKAT OLAHRAGA DAN KESEHATAN (JASO) Vol. 3 No. 2 (2023): Jurnal Pengabdian Masyarakat Olahraga dan Kesehatan
Publisher : DEPARTEMEN KESEHATAN DAN REKREASI UNIVERSITAS NEGERI PADANG

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

Abstract

Pemanfaatan teknologi dalam ilmu keolahragaan merupakan sesuatu hal yang wajib diperhatikan oleh setiap praktisi serta akademisi keloahragaan. Pengukuran merupakan salah satu aspek penting dalam setiap tahapan pembinaan olahraga. dalam pengukuran, pemanfaatan teknologi sangat dianjurkan dalam mencapai validitas data yang akurat dan tepat. selain itu, pelaksanaan tes harus pula dilakukan sesuai prosesur dan ketentuan yang terstandar, dan ini memerlukan tenaga ahli dan berpengalaman serta tersertfikasi. Hirilisasi hasil penelitian diharapkan mampu memberikan berbagai manfaat dan menjadi salah satu asset yang dapat digunakan Perguruan tinggi dalam hal pendapatan. Tujuan kegiatan ini adalah mengembangkan sebuah pusar layanan tes dan pengukuran kondisi fisik yang diharapkan mampu memberikan sumbangan nyata pada masyarakat dalam hal pemanfaatan teknologi keolahragaan. Selain itu, Kegiatan ini diharapkan mampu menjadi salah satu sector yang dapat memberikan pendapatan bagi PT. Produk yang ditawarkan dalam program ini adalah Penyewaan alat-alat keolahragaan, pelayanan tes dan pengkuruan keolahragaan dan penjualan produk-produk hasil penelitian dosen yang berkaitan produk inovasi keolahragaan. Metode kegiatan dilaksanakan dengan pola Kerjasama dan pola penjulaan langsung dan tidak langsung. Indikator keberhasilan dilihat dari pemasukan yang diperoleh selama 1 tahun pelaksanaan yang dilihat dan dilaporkan pertriwulan. BErdasarkan evaluasi serta perhitungan clasflow, diketahui program telah berhasil memperoleh benefit sesuai dengan prediksi.
sebuah Pengaruh Pendekatan STEM Terhadap Kemampuan Berpikir Kritis Siswa : Meta Analisis Betty Mizarwan; Yohandri; Usmeldi
Jurnal Penelitian Pendidikan IPA Vol 12 No 6 (2026)
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i6.13972

Abstract

Indonesia's. STEM education is one method that may help students succeed in the modern world. This study set out to assess the quality of prior work that looked at how STEM education affected students' capacity for critical thinking. Level of education and learning model were the moderators taken into account in this research. In order to get quantitative data, the researchers used meta-analysis to determine the impact size of each study that was relevant. Journals acknowledged with an ISSN between 2020 and 2025 were the criterion used to look for national and international journals that have been researched by previous researchers. According to the impact size study of STEM education on students' critical thinking abilities, which was conducted across all educational levels and models, the findings were in the high category. This suggests that students' critical thinking abilities may be enhanced across all educational levels via the use of the STEM method in the classroom.
Co-Authors - Asrizal - Asrizal - Asrizal, - - Yulkifli - Yulkifli Abdul Razak Abubakar Adibil Mahdi Rahmad Hidayat Ahmad Fauzi Al Khudri Sembiring Alex Sandryadi Alfindri Zulkarnaini Ali Amran Alvissda Damai Ananda Putra Angela Widiya Pratama Angga Saputra Anggraini Anggraini Apriani Sijabat Arif Farma Putra Asrizal Asrizal Asrizal Aulia Asman Aulia Sofianora Auliya Sifa Fauziyyah Bastian Wahyudi Betty Mizarwan Budi Iman Samiaji Budiman Nasution Cahyati, Mona Trisna Citra Syefriana Deski Beri Desnita Dewi Puspa Sari Diliarosta, S. Djusmaini Djamas Elfiana Lathifa Rahma Emafri, Wenda Erin Ficrah Huda Even Triaga Fanny Rahmatina Rahim Farah Sarjani Farah Sarjani Farhan El Maulid Fauzan Al Haqqi Festiyed Festiyed Festiyed Festiyed Fitra Maryulis Fitri Afriani Fitri Arsih Fitri Arsih Fuja Novitra Gusnedi Gusnedi Gusnedi, - Hamdi Rifai Hanifa Yoanda Hardeli Hardeli Hary Sanjaya Hary Sanjaya Hary Sanjaya Hary Sanjaya Hary Sanjaya Hasbi Azis Heri -Maryono Hermansyah Aziz Heron Tarigan Hufri Hufri Ilham Alimuddin Ilham Hafidzh Wijaya Inandita Mardhiyah Indang Dewata Irena Retno Damayanti Irfan Muhammad Zaqi Irfandi Irfandi Josaphat Tetuko Sri Sumantyo Joshapat T. Sri Sumantyo Khairat, Raudhatul Khairunnisa Khairunnisa Komaini, Anton Kurnia Ashadi Laila Suryani Lily Handayani Linda Winiasri M. Yogi Riyantama Isjoni Maisa Fitri Marlince NK Nababan Marlince NK Nababan Marta Dinata Minda Azhar Minda Azhar Mirza Muhammad Waqar Mitri Selisne Moulia Fadhilah Muhammad Gani Ariski Muhammad Irsyad Muhammad Rahfiqa Zainal Naurah Nazhifah Naurah Nazhifah Nilam Nilam Nofi Yendri Sudiar Nofi Yendri Sudiar Nur Anisa Sati’at Nurhafizah Nurhafizah Nurhasanah Nurhasanah Nurhasnah, Nurhasnah Nurul Ihsan Palma Juanta Palma Juanta Puti Aulia Mardiah Putra, Ananda Putri Ayu Putri Yuliana Mahardika Putri, Yosa Aulya Rahadian Zainul Rahma Sari Rahma, Mila Devita Rahmat Dito Tri Wicaksono Rahmatul Fitria Rahmi Sukmawati Ramli Ramli Ramli Ramli Ramli, - Raudhah Awal Ridho Pratama Ridwan Abdullah Sani Rikizaputra Rikizaputra Rio Anshari Risa Noviarti Robby Zeffry Robika Alkadri Roza, Media S. Solheri Sari, Yulis Septianas Selisne, Mitri Septian Budiman Siltri, Dina Mulya Silvi Yulia Sari Siregar, A. M. Siti Aisyah Suci Ana Yolanda Suci Ramadhani Sudarma, T. F. Supari Supari Surahman, D. Syafriani Syafriani Syufrawardi Syufrawardi Syukri Arief Tomi Apra Santosa Ulfa Fadhilah Ulianas, Alizar Umar Kalmar Nizar Usmeldi Usmeldi Venezia Ferly Wiranda Viskia Manelza Vivi Wulandari Vivi Wulandari Wahyuni Satria Dewi Wahyunita Wulandari Wandika Wenda Emafri winni suhadi Yeni Stiadi Yenni Darvina Yerimadesi Yohanna Dasriyani Yohanna Dasriyani Yosi Dwi Anggreni Yul Ifda Tanjung Yulhendri Yulhendri Yulis Septianas Sari Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli YUNALDI YUNALDI Yurnetti Yurnetti Zulhendri Kamus Zulpadrianto Z Zulyusri Zulyusri Zulyusri, Zulyusri Zurian Affandi