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All Journal 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) 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 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 JURNAL MUARA PENDIDIKAN JRFES Journal of Experimental and Applied Physics
Yohandri
Department Of Physics, Universitas Negeri Padang
Aerospace Engineering Agriculture, Biological Sciences & Forestry 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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Synthesis of Graphene Oxide from Sugarcane Bagasse by Using Modified Hummers Method as a Microwave Absorber Rahma, Mila Devita; Ramli, -; Gusnedi, -; Yohandri, -
PILLAR OF PHYSICS Vol 17, No 2 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14821171074

Abstract

Bagasse, a residue from sugarcane processing, is chosen as the raw material due to its potential as an environmentally friendly, inexpensive, and easily obtainable carbon source. The modified Hummers method is a modification of the original Hummers method, incorporating thermal treatment in the initial synthesis stage to enhance the efficiency and quality of synthesis. The thermal treatment aims to improve the efficiency and quality of the synthesized graphene oxide. The modification is carried out in the synthesis process to obtain a high-quality product with better efficiency. Furthermore, this modification can also reduce synthesis time and minimize the risk of damage to the raw material. After the synthesis process is completed, the produced graphene oxide is characterized using various analytical techniques, including Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The synthesized graphene oxide is then tested for its ability to absorb microwaves at X-band frequencies (8-12 GHz). The characterization results indicate that the synthesized graphene oxide possesses a homogeneous structure with thin graphene layers and a clean surface. Moreover, the graphene oxide also exhibits excellent microwave absorption properties at an X-band frequency of 10.16 GHz, with a reflection loss value of -23.94 dB, absorption coefficient of 93.65%, and absorption bandwidth of 1.13 GHz. The test results demonstrate that the graphene oxide derived from bagasse exhibits significant absorption capabilities towards microwaves at specific frequencies. This indicates the potential application of graphene oxide as an effective microwave absorber material.
Design and Construction of Air Quality Monitoring System using Node MCU IoT Based Wulandari, Vivi; Yohandri, -
PILLAR OF PHYSICS Vol 17, No 2 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13471171074

Abstract

Air as a natural resource affects human life and other natural resources. Air consists of about 78% Nitrogen, 20% Oxygen, 1.07% consists of Neon (Ne), Helium (He), Methane (CH4) and Hydrogen (H2), 0.9% Argon and the remaining 0.03% Carbon Dioxide (CO2). This research is a type of engineering research. Data collection was carried out by direct measurement. For direct data collection, it was carried out by monitoring levels of CO2, CO, temperature, and humidity, for data collection from each parameter, 5 variations were given for measurement. Based on the objectives of the research, the results of the design specifications of the tool are obtained, namely the percentage level of accuracy of the average measurement produced by air quality monitoring which is 97.78%, the average percentage of relative error obtained is 2.24%. Therefore, it can be concluded that the specifications for the performance of the tool are that the components that make up the tool can work well
Electronic Pad To Paragliding Landing Score System Based Internet Of Things (IOT) Venezia Ferly Wiranda; Yohandri
Journal of Experimental and Applied Physics Vol 1 No 2 (2023): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i2.11

Abstract

Advances in technology allow sports equipment to become more efficient, easier to use, and have more use value. One of the technological advancements in the field of paragliding is the existence of a tool that can measure paragliding accuracy scores without having to measure them manually. However, this tool is still difficult to obtain because the price is expensive and the diameter is still 22 cm, so if a paragliding athlete lands outside the tool it is still measured manually. Therefore, an Internet of Things (IoT) based electronic pad with a diameter of 100 cm was developed. This electronic pad is designed to use a push button as a detector to get a paragliding screening accuracy score and a Radio Frequency Identification (RFID) sensor is used to detect the identity code of the intended athlete. The output of the tool appears on Google Sheets and in the Android application to make it easier to record scores for the superior accuracy of paragliding athletes. The type of research used is engineered research, namely research that applies knowledge in the form of tool design or design. The direct result of the research is the measurement of the heart rate score and the identity code of the paragliding athlete and for the indirect measurement results in the form of the accuracy of the electronic pad device is 1 and the accuracy of the tool is 1. Based on the results of its accuracy and precision, this electronic pad tool is suitable for measuring landing accuracy scores and paragliding athlete identity codes.
Design and Construction of Air Quality Monitoring System using NodeMCU IoT-Based Vivi Wulandari; Yohandri
Journal of Experimental and Applied Physics Vol 1 No 2 (2023): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i2.23

Abstract

Air as a natural resource affects human life and other natural resources. Air consists of about 78% Nitrogen, 20% Oxygen, 1.07% consists of Neon (Ne), Helium (He), Methane (CH4) and Hydrogen (H2), 0.9% Argon and the remaining 0.03% Carbon Dioxide (CO2). This research is a type of engineering research. Data collection was carried out by direct measurement. For direct data collection, it was carried out by monitoring levels of CO2, CO, temperature, and humidity, for data collection from each parameter, 5 variations were given for measurement. Based on the objectives of the research, the results of the design specifications of the tool are obtained, namely the percentage level of accuracy of the average measurement produced by air quality monitoring which is 97.78%, the average percentage of relative error obtained is 2.24%. Therefore, it can be concluded that the specifications for the performance of the tool are that the components that make up the tool can work well.  
Development of Measurement Instrument of Translation Motion in Constant Acceleration Experiment using Infrared Obstacle Avoidance Sensor Module and MPU 6050 Based on ATmega32U4 Microcontroller Ilham Hafidzh Wijaya; Yohandri Yohandri; Asrizal Asrizal; Yulkifli Yulkifli
Journal of Experimental and Applied Physics Vol 1 No 3 (2023): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i3.29

Abstract

Physics is a field of study that holds significant influence in the development of science and technology. Many natural phenomena are related to physics and can be explained through experiments. From the results of conducted research, it is known that measurements for Translation Motion in Constant Acceleration experiments were carried out manually using standard measuring tools. The limitations of these measuring tools rendered the process impractical and susceptible to errors. To overcome these limitations, an experimental device equipped with automated digital measurement instruments was developed. The objective of this research is to ascertain the design specifications and performance specifications of the experimental device. The performance specifications of the experimental device include a track length of 2 meters and a width of 13mm. It involves the use of a servo motor, Infrared Obstacle Avoidance Sensor Module, and MPU 6050. The design specifications of the experimental device include an angle measurement accuracy of 92%, time measurement accuracy of 89%, velocity measurement accuracy of 87%, and time measurement precision of 92%. So, it is concluded that the measurement instrument can work properly.
Designing Automatic Safe Security Devices Using Microcontroller Based RFID and Fingerprint Angga Saputra; Yohandri Yohandri
Journal of Experimental and Applied Physics Vol 1 No 3 (2023): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i3.35

Abstract

A safe is a fire-resistant metal cabinet or box that is usually used by the owner to store valuables (such as money, valuable papers, jewelry, etc.) from thieves/burglars. Safes are generally in the form of cubes/blocks or cylinders. Safes are usually wall-mounted, as well as large room-shaped safes. But not a few also know the weaknesses of the security so that the safe is easily stolen. Based on the description above, in this study the authors are interested in designing an automatic safe system using a fingerprint microcontroller-based in the main system, this automatic safe is regulated by the Arduino Atmega 2560 microcontroller with the Arduino IDE programming language. The safe system automatically works when the user enters the fingerprint and RFID tag correctly, the safe will open. Based on data analysis, it is obtained in the form of a mechanical tool in the test, the characteristics of the sensor, accuracy and precision of the tool are obtained. The characteristics of the sensor can be seen from the fingerprint sensor and RFID sensor. The accuracy value of the sensor on the tool, namely the fingerprint sensor and RFID sensor, the accuracy is very good, the accuracy of the RFID sensor voltage is 99.73% while the accuracy value of the RFID sensor has very good accuracy.
PENGEMBANGAN E-MODUL IPA BERBASIS PjBL (Project Based Learning) PADA KELAS VIII UNTUK MENINGKATKAN KETERAMPILAN BERPIKIR KRITIS PESERTA DIDIK Suci Ana Yolanda; Yohandri
Jurnal Penelitian Pendidikan IPA Vol 11 No 10 (2025): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i10.12283

Abstract

Exercise questions used by educators are still in the form of questions that are classified as easy and have not been able to improve the ability to think critically One of the learning needs of learners is a learning resource that is in accordance with the development of the 21st century. (e-module). The purpose of this research is to produce a project-based learning (PjBL)-based science e-module with valid, practical, and effective categories.with valid, practical, and effective categories. This research is a type of research and development with the ADDIE development model, namely Analyze, Design, Development, Implementation, Evaluation. The research instrument consists of a preliminary questionnaire, validation instrument, practicality instrument, and effectiveness instrument. Data analysis techniques consist of preliminary study data, validity data, practicality data, and effectiveness data. Based on the results of the assessment of project-based learning (PjBL) based science e-modules conducted by experts, the results obtained with an average validation by media experts, material experts and linguists are in the valid category. The practicality of e-modules assessed by teachers and students of SMPN 6 Padang Panjang is in the practical and very practical categories. Effectiveness, project-based learning (PjBL) based science e-modules are in the effective category. Based on the results of the study, it can be concluded that project-based learning-based science e-modules meet the criteria of valid, practical, and effective.
Co-Authors - Asrizal - Asrizal - Asrizal, - - Yulkifli - Yulkifli Abdul Razak 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 Auliya Sifa Fauziyyah Bastian Wahyudi Cahyati, Mona Trisna Citra Syefriana Deski Beri Desnita Dewi Puspa Sari Dewi Puspa Sari, Dewi Puspa Diliarosta, S. Dinata, Marta 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 Fitra Maryulis Fitri Afriani Fitri Arsih Fuja Novitra Gusnedi Gusnedi Gusnedi, - Hamdi Rifai Hanifa Yoanda Hardeli Hardeli Hary Sanjaya Hary Sanjaya Hary Sanjaya Hary Sanjaya Heri -Maryono 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 Minda Azhar Mirza Muhammad Waqar Mitri Selisne Moulia Fadhilah Muhammad Gani Ariski Muhammad Irsyad Muhammad Rahfiqa Zainal Naurah Nazhifah Nilam Nilam 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 Rikizaputra Rikizaputra Rio Anshari Risa Noviarti Robby Zeffry Robika Alkadri S. Solheri Sari, Yulis Septianas Selisne, Mitri Siltri, Dina Mulya Silvi Yulia Sari Siregar, A. M. Siti Aisyah Suci Ana Yolanda Suci Ramadhani Sudarma, T. F. Surahman, D. Syafriani Syafriani Syufrawardi Syufrawardi 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 Yenni Darvina Yohanna Dasriyani Yohanna Dasriyani Yosi Dwi Anggreni Yulhendri Yulhendri Yulis Septianas Sari Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli YUNALDI YUNALDI Yurnetti Yurnetti Zulhendri Kamus Zulpadrianto Z Zulyusri Zulyusri Zurian Affandi