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All Journal International Journal of Renewable Energy Development Journal of Degraded and Mining Lands Management JOIV : International Journal on Informatics Visualization AL ISHLAH Jurnal Pendidikan Emerging Science Journal JURNAL INTEGRASI JURNAL PENDIDIKAN TAMBUSAI Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Sainstek : Jurnal Sains dan Teknologi Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika JIFP (Jurnal Ilmu Fisika dan Pembelajarannya) MASALIQ: Jurnal Pendidikan dan Sains Georest: Geoscience, Remote Sensing, and Technology Gudang Jurnal Multidisiplin Ilmu International Journal of Renewable Energy Development
Pakhrur Razi
Universitas Negeri Padang
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Other

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Pengelolaan Sampah Plastik Daerah Kepulauan di Siberut Selatan Mentawai Nofi Yendri Sudiar; Asrizal Asrizal; Pakhrur Razi; Mohammad Isa Gautama
ABDI: Jurnal Pengabdian dan Pemberdayaan Masyarakat Vol 4 No 2 (2022): Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat
Publisher : Labor Jurusan Sosiologi, Fakultas Ilmu Sosial, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/abdi.v4i2.299

Abstract

Day to day, the volume of plastic waste in Indonesia is increasing along with the increasing number of products and people's consumption patterns. According to data in 2021, the total national waste was 68.5 million tons. The main thing that must be done to overcome the case is to reduce the volume of plastic waste from its source through community empowerment about the importance of caring for environmental cleanliness. Problems regarding the management of plastic waste in the islands of South Siberut, among others, most (83.3%) of the community still do not separate organic and inorganic waste. Second, most (61.1%) of the community have not separated plastic waste. Furthermore, most people (83.3%) have never made compost from household waste. Finally, most (77.8%) of the people shopping at the market have not brought their own shopping bags. This community service activity is carried out through lecture presentation methods, discussions and workshops. This activity aims to increase public awareness about the dangers of plastic waste, and transform people's behavior to be able to manage the flow of plastic waste independently. From the results of the community service program that has been carried out, there has been an increase in public interest in the context of changing behavior in managing plastic waste.
Profile of Students’ Character in the Reading to Learn (R2L) Model in Improving Scientific Literacy Skills Arief Muttaqiin; Aisyah Salsabila Dwi Ananda; Putri Aulia; Pakhrur Razi; Yusefarina Yusefarina; Lahara Yanuarsi
AL-ISHLAH: Jurnal Pendidikan Vol 14, No 4 (2022): AL-ISHLAH: Jurnal Pendidikan
Publisher : STAI Hubbulwathan Duri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35445/alishlah.v14i4.1503

Abstract

This study aims to determine the description of the character of students during learning with the Reading to Learn (R2L) Model in order to improve their scientific literacy skills. This learning was carried out for 3 meetings on dynamic electricity material. During the study, observations were made by two observers using an observation sheet containing the student's character. Aspects of student character observed in this study were curiosity, adaptability, social behavior, and initiative. The students observed consisted of four classes. The number of students involved was 64 students (n=64). Based on observations, the highest character that emerges from students during learning is the character of socio-cultural behavior (52.95%), while the lowest character is curiosity (44.44%).
Studi Geologi Terhadap Analisis Kestabilan Lereng Menggunakan Metode RMR (Rock Mass Rating) Pada Jalan Daerah Koto Lamo, Kecamatan Kapur Sembilan, Sumatera Barat Husnul Kausarian; Muhammad Yusuf; Adi Suryadi; Pakhrur Razi; Fitri Mairizki
JURNAL INTEGRASI Vol 15 No 1 (2023): Jurnal Integrasi - April 2023
Publisher : Pusat Penelitian dan Pengabdian Masyarakat Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/ji.v15i1.5450

Abstract

geographically, the research area is located at coordinates 0°21'12."- 0° 22' 50." latitude and 00°10'53" - 100°33'44.4620" longitude. the study is in the koto lamo and surrounding areas, Kapur Sembilan district, West Sumatra Province. the purpose of this study was to determine the level of slope stability in the study area using the UCS (Uniaxial Compressive Strength) analysis method for intact rock strength, RMR (Rock Mass Rating) and stereographic. From the field data, there are 10 scanlines of the main research objects. Geological mapping shows the slopes are sandstone. From the rock analysis UCS (Uniaxial Compressive Strength), the strength of intact rock the average value of the Schmidt hammer test is 13.08, while the density value of rock samples is 25.86 KN⁄m³. From these results obtained a Uniaxial Compressive Strength (UCS) value of 19 mpa, included in the weight 2 with a weak category. Then the results of the RMR (Rock Mass Rating) analysis are worth 35.4 with RMR class IV (poor).
Development of Physics Learning Based on Video Integrated Flipped Classroom Model Using Moodle Silfi sutri Insani; Pakhrur Razi
PILLAR OF PHYSICS EDUCATION Vol 16, No 2 (2023)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14545171074

Abstract

21st century education requires students to have skills that can answer the challenges of revolution 4.0. Skills that should be mastered are data, technology and human literacy. However, the government's efforts to issue policies to implement scientific literacy of the 2013 Curriculum to boost Indonesian education have not been optimized by schools. This is known by the lack of technology adoption in learning tools by educators. In order for students to have skills in the era of revolution 4.0, a learning resource was developed in the form of physics learning based on video integrated Flipped Classroom using Moodle. The purpose of this study is determine the validity and practicality of physics learning videos. This research was conducted using the Research and Development (R&D) model and quantitative descriptive methodology. This research using validity and practicality instrument test for analyze data to know satisfied product learning. Product validation was carried out by expert and received a score of 88 with a very valid category. After making revisions according to expert advice, practicality test was carried out at SMAN 1 Pariaman. Practicality was carried out by physics teachers and students in limit scale. Practicality results were obtained with a score of 86 from teacher responses and a score of 87 from participant responses. From the results of validity and practicality, the physics learning based on video integrated flipped classroom model using Moodle is categorized as very valid and very satisfied  so it is feasible to use in the learning process in the classroom.
Numerical Analysis of Energy Converter for Wave Energy Power Generation-Pendulum System Jamrud Aminuddin; Mukhtar Effendi; Nurhayati Nurhayati; Agustina Widiyani; Pakhrur Razi; Wihantoro Wihantoro; Abdullah Nur Aziz; R Farzand Abdullatif; Sunardi Sunardi; Bilalodin Bilalodin; A Arifin
International Journal of Renewable Energy Development Vol 9, No 2 (2020): July 2020
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.9.2.255-261

Abstract

The wave energy power generation-pendulum system (WEPG-PS) is a four-wheeled instrument designed to convert wave power into electric energy. The first wheel is connected to the pendulum by a double freewheel, the second and third are ordinary wheels, while the fourth is a converter component that is axially connected to the electric generator. This design used the Euler-Lagrange formalism and Runge-Kutta method to examine an ideal dimension and determine the numerical solution of the equation of motion related to the rotation speed of the wheels. The result showed that the WEPG-PS' converter system rotated properly when its mass, length, and moment of inertia are 10 kg, 2.0 m, and 0.25 kgm2, respectively. This is in addition to when the radius of the first, second, third, and fourth wheels are 0.5, 0.4, 0.2, and 0.01 m, with inertia values of 0.005, 0.004, 0.003, and 0.1 kgm2. The converter system has the ability to rotate the fourth wheel, which acts as the handle of an electric generator at an angular frequency of approximately 500 - 600 rad/s. The converter system is optimally rotated when driven by a minimum force of 5 N and maximum friction of 0.05. Therefore, the system is used to generate electricity at an amplitude of 0.3 - 0.61 m, 220 V with 50 Hz. Besides, the lower rotation speed and frequency of the energy converter of the WEPG-PS (300 rad/s) and induction generator (50 Hz) were able to generate electric power of 7.5 kW. 
Analysis of Extreme Rainfall in Padang Using GSMaP Satellite Imagery: Case Study of the July 2023 Flood : Approach Using GSMaP Satellite Data Rozi, Hanifsyah; Razi, Pakhrur; Amir, Harman; Sudiar, Nofi Yendri; Rinadi, Aulia
Georest Vol. 2 No. 2 (2024): Georest (In Press)
Publisher : EarthCare

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57265/georest.v2i2.32

Abstract

Extreme rainfall is a major cause of major flooding in coastal areas, such as Padang, Indonesia. This study analyzes the extreme rainfall event that caused the Padang flood on July 14, 2023 using rainfall data from the Global Satellite Rainfall Mapping system (GSMaP). The aim is to evaluate the spatial and temporal distribution of rainfall during the event and assess the accuracy of GSMaP satellite imagery in capturing the heavy rainfall that caused the flooding. GSMaP satellite data were processed to examine the intensity and distribution of rainfall from July 13, 2023 to July 14, 2023. The analysis showed that rainfall occurred evenly over the entire Padang area, with a peak rainfall intensity of 20-99 mm/day on July 13 and a much higher intensity of 145-434 mm/day on July 14, as recorded by ground-based rain stations. The peak rainfall on the first day occurred at 14:00 UTC, and on the second day at 00:00 UTC. Although GSMaP effectively captured the large-scale rainfall pattern, differences were seen in the local intensity. This continuous rainfall causes severe waterlogging, which then escalates into flooding, which is classified as extreme rainfall. These findings demonstrate the utility of GSMaP in monitoring extreme rainfall, especially in areas with limited ground-based observation infrastructure, and emphasize the role of satellite data in improving early warning systems and flood management strategies in flood-prone areas such as Padang.
Extreme Rainfall Trends and Hydrometeorological Disasters in Tropical Regions: Implications for Climate Resilience Yanfatriani, Elsa; Marzuki, Marzuki; Vonnisa, Mutya; Razi, Pakhrur; Hapsoro, Cahyo A.; Ramadhan, Ravidho; Yusnaini, Helmi
Emerging Science Journal Vol 8, No 5 (2024): October
Publisher : Ital Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/ESJ-2024-08-05-012

Abstract

Hydrometeorological disasters due to extreme weather events represent a significant threat to the security of life in Jambi Province. In order to develop effective strategies for mitigating this threat, it is essential to gain a comprehensive understanding of the underlying dynamics that give rise to such disasters. Despite the high frequency of these events, more research is needed on the complex relationship between trends in extreme indices and the frequency of hydrometeorological disasters in this region. This study addresses this gap by utilizing rainfall data from 2008 to 2020 from the Integrated Multi-satellite Retrievals for GPM (IMERG) and hydrometeorological disaster data from the National Disaster Management Agency (BNPB). A range of extreme rainfall indices, including PRCPTOT, R85P, R95P, R99P, CWD, CDD, R1mm, R10mm, R20mm, R50mm, RX1Day, RX5Day, and SDII, were subjected to careful analysis concerning hydrometeorological disasters, including floods, landslides, tornadoes, droughts, and forest fires. Notable results indicate a significant increasing trend (p < 0.05) for the CWD index, while decreasing trends are observed for R85P, R95P, R99P, R50mm, RX1Day, RX5Day, and SDII. PRCPTOT and R20mm show decreasing trends, and CDD shows an increasing trend, although it is not statistically significant (p > 0.05). Subsequently, there was a significant increase in landslides and tornadoes, while forest fires and floods showed an insignificant increase (p > 0.05). Drought exhibited a significant decreasing trend in Jambi. Correlation analysis revealed the complex relationship between extreme weather indices and hydrometeorological disasters. The positive correlations observed between most extreme rainfall indices and floods and landslides, except for CDD, indicate that extreme rainfall is the primary cause of these disasters in Jambi. The correlation is particularly pronounced in areas with mountainous topography, where landslides are more prevalent. The positive correlations observed between CDD and droughts and forest fires suggest that periods of reduced rainfall and increased drought contribute to these disasters. This correlation is more robust in districts with extensive peatlands. The results provide valuable insights into the vulnerability of Jambi Province to hydrometeorological disasters and highlight the importance of understanding regional variations in extreme weather events. These findings improve our understanding of the interactions between climate indices and disasters and provide the basis for informed risk reduction and adaptation strategies in changing climatic conditions. Doi: 10.28991/ESJ-2024-08-05-012 Full Text: PDF
Pemanfaatan Limbah Tongkol Jagung Sebagai Briket Arang : Potensi Energi Alternatif Dan Ekonomi Di SMAN 10 Solok Selatan Zulazhari; Hamdi; Pakhrur Razi
Gudang Jurnal Multidisiplin Ilmu Vol. 3 No. 1 (2025): GJMI - JANUARI
Publisher : PT. Gudang Pustaka Cendekia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59435/gjmi.v3i1.1271

Abstract

Karena ketersediaan sumber energi utama yang terbatas, pengembangan sumber energi alternatif diperlukan untuk pemenuhan konsumsi energi yang sangat tinggi dan untuk mengurangi penggunaan bahan bakar fosil dalam aktivitas rumah tangga dan bisnis. Biomassa dan bahan limbah organik adalah dua dari banyak sumber energi alternatif yang dapat diperbaharui yang tersedia di Indonesia (Putro, 2014). Salah satu cara yang dapat dilakukan untuk mengatasi krisis ini adalah dengan mengembangkan briket. Sebaliknya, untuk menjaga kelestarian lingkungan pertanian, masalah produksi sampah, terutama sampah pertanian seperti tongkol jagung, harus ditangani. Salah satu cara untuk memecahkan masalah ini adalah dengan mengolah sampah dari produksi pertanian menjadi briket. Program Penguatan Profil Pelajar Pancasila (P5), yang berfokus pada gaya hidup berkelanjutan, meminta sekolah untuk mengambil bagian dalam upaya pemenuhan energi dengan mempertimbangkan potensi lokal. Salah satu kegiatan program P5 itu adalah "Pemanfaatan limbah tongkol jagunng sebagai briket arang: potensi energi alternatif dan ekonomi di SMAN 10 Solok Selatan". Hasil penelitian menunjukkan bahwa limbah tongkol jagung dapat digunakan sebagai bahan dasar untuk membuat produk arang briket. Ciri-ciri fisik arang briket yang dihasilkan membuatnya ideal untuk digunakan sebagai bahan bakar alternatif. Briket arang yang dihasilkan berbentuk silinder berdiameter lima sentimeter dan tinggi tiga sentimeter. Uji fisik menunjukkan bahwa briket memiliki kekuatan yang cukup keras dengan jenis perekat tepung kanji dengan persentase masing-masing 5%, 10%, dan 15%. Hasil uji nyala menunjukkan bahwa briket hanya membutuhkan satu menit untuk menyala menjadi bara api yang siap digunakan
Pengaruh ENSO dan IOD Terhadap Curah Hujan di Indonesia Fadila, Husnul; Yendri Sudiar, Nofi; Razi, Pakhrur; Zulhendra, Zulhendra
Jurnal Pendidikan Tambusai Vol. 9 No. 1 (2025)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

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

Abstract

Penelitian ini memiliki tujuan untuk mengkaji pengaruh fenomena ENSO (El Niño Southern Oscillation) dan IOD (Indian Ocean Dipole) terhadap pola curah hujan di Indonesia. Fenomena ENSO dan IOD dipengaruhi oleh perubahan suhu permukaan laut, dengan IOD terjadi di wilayah tropis Samudra Hindia dan El Niño-La Niña di Samudra Pasifik. Data yang digunakan dalam studi ini mencakup Indeks Niño 3.4, Indeks Dipole Mode, serta data curah hujan. Hasil penelitian menunjukkan bahwa di stasiun dengan tipe curah hujan monsun, seperti Bali dan Jawa Timur, terdapat korelasi signifikan dengan kategori rendah dan sangat rendah. Di stasiun dengan tipe curah hujan ekuatorial, seperti Sumatra Barat dan Kalimantan Barat, korelasi yang ditemukan ada yang signifikan dan ada yang tidak, dengan kategori rendah dan sangat rendah. Hal serupa juga ditemukan pada stasiun dengan tipe curah hujan lokal, seperti Maluku dan Papua.
Pengaruh Volatile Organic Compounds(VOC) dan Radiasi Matahari terhadap Konsentrasi Ozon Permukaan di Bukit Kototabang Bukittinggi Bahri, Aliefa Zunaida; Sudiar, Nofi Yendri; Razi, Pakhrur; Zulhendra, Zulhendra
Jurnal Pendidikan Tambusai Vol. 9 No. 1 (2025)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v9i1.25480

Abstract

Penelitian ini akan menganalisis secara mendalam bagaimana senyawa organik volatil (Volatile Organic Compounds/VOC) dan radiasi matahari terhadap konsentrasi ozon permukaan di Stasiun GAW Bukit Kototabang, Bukittinggi. Data VOC meliputi etanol dan propanol, serta data intensitas radiasi matahari, dianalisis sebagai variabel independen yang memengaruhi pembentukan ozon permukaan melalui reaksi fotokimia. Metode yang di implementasikan dalam analisis ini adalah regresi linier berganda untuk memahami kekuatan hubungan antarvariabel dan tingkat kontribusi masing-masing variabel terhadap konsentrasi ozon permukaan. Hasil penelitian menunjukkan bahwa VOC dan radiasi matahari berkontribusi positif terhadap peningkatan konsentrasi ozon permukaan, dengan intensitas maksimum terjadi pada siang hari. Secara statistik, analisis regresi menunjukkan nilai R-squared sebesar 79%, yang mengindikasikan bahwa kombinasi radiasi matahari dan konsentrasi VOC dapat menjelaskan sebagian besar variasi ozon permukaan di lokasi penelitian. Namun, yang tersisa senilai 21% mungkin dipengaruhi oleh variabel eksternal yang tidak dikaji dalam penelitian ini, seperti kelembapan udara, suhu, dan emisi dari sumber antropogenik lainnya.
Co-Authors A Arifin Abdullah Nur Aziz Abdullah Nur Aziz Addriani, Ranti Adi Suryadi Adree Octova Aisyah Salsabila Dwi Ananda Akmam Akmam Akmam Amali Putra Amalia Putri, Amalia Aminuddin, Jamrud Andika, Heru Anofa Liona Arief Muttaqiin Arifin, A Asrizal Bahri, Aliefa Zunaida Bilalodin Bilalodin Fadila, Husnul Farzand Abdullatif fitri mairizki Gautama, Mohammad Isa Genov Zulmartin Hamdi Hamdi Hamdi Handayani, Sri Gusti Hapsoro, Cahyo A. Harman Amir Hidayati Hidayati Husna, Rahmi Juita Husnul Kausarian Ifdil Ifdil Izumi, Yuta Jamrud Aminuddin Josaphat Tetuko Sri Sumantyo Komaini, Anton Lahara Yanuarsi Marsa, Indira Marzuki Marzuki Mega Oktisa Melnix, Frennadito Muhammad Bohori MUHAMMAD YUSUF Mukhtar Effendi Mukhtar Effendi Mutya Vonnisa Nishi, Katsunoshin Nofi Yendri Sudiar Nofi Yendri Sudiar Nurhayati Nurhayati Nurhayati Nurhayati Putri Aulia R Farzand Abdullatif rahmi juita husna Ramadhan, Ravidho Rena Ramadhani Putri Revielni Sandra Rinadi, Aulia Rozi, Hanifsyah Saputri, Deby Yeriza Silfi sutri Insani Sri Wahyu Hidayati Sunardi Sunardi Sunardi Sunardi Thamrin Thamrin Widia Mai Yetri Widiyani, Agustina Wihantoro Wihantoro Wihantoro Wihantoro Yanfatriani, Elsa Yanuar Kiram Yasmin, Putri Yendri Sudiar, Nofi Yenni Darvina Yohandri Bow Yoszi Mingsi Anaperta Yusefarina Yusefarina Yusnaini, Helmi Zakaria, Jaffri Bin Zulazhari Zulhendra Zulhendra Zulhendri Kamus