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All Journal BERKALA FISIKA Sainstek SEMIRATA 2015 Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Ilmiah Pendidikan Fisika Spektra: Jurnal Fisika dan Aplikasinya JURNAL EKSAKTA PENDIDIKAN (JEP) JURNAL PENDIDIKAN TAMBUSAI Jurnal Teori dan Aplikasi Fisika Abdi Dosen : Jurnal Pengabdian Pada Masyarakat Pelita Eksakta Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Jurnal Humanities Pengabdian Kepada Masyarakat Jurnal Ilmiah Profesi Pendidikan Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Journal of Comprehensive Science MASALIQ: Jurnal Pendidikan dan Sains Journal of Innovative Physics Teaching (JIPT) Journal of Climate Change Society Physics Learning and Education Journal of Experimental and Applied Physics
Yenni Darvina
Universias Negeri Padang
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Environmental Science Health Professions Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Other

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Analysis of XRD Characterization of Fe3O4/Polypyrrole Nanocomposite Prepared by Sol-Gel Method Febriani, Annisa; Ramli, -; Gusnedi, -; Darvina, Yenni
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: 10.24036/13525171074

Abstract

Nanocomposites can be thought of as solid structures with nanometer-scale dimensions that repeat at the distances between different structural constituents. In this study, Fe3O4 was used as a filler and Polypyrrole polymer as the matrix material. This research was conducted by varying the Fe3O4: Polypyrrole composition of 5 variations including 30%, 40%, 50%, 60%, and 70% w/w. This research was conducted to analyze the results of the XRD characterization of Fe3O4/Polypyrrole nanocomposite using the sol-gel method. The tool used in this research is X-Ray Diffraction (XRD) obtained the phase structure, crystal size, and microstrain. Based on the results of the study, the greater the polypyrrole composition, the greater the crystal size and microstrain. Details of the results are described in this paper.
THE EFFECT OF THE SEARCH, SOLVE, CREATE, AND SHARE MODEL ON STUDENTS’ SCIENCE PROCESS SKILLS IN MEASUREMENT MATERIAL Miftahurrahmah, Miftahurrahmah; Darvina, Yenni; Yurnetti, Yurnetti; Novitra, Fuja
PILLAR OF PHYSICS EDUCATION Vol 17, No 4 (2024)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/16691171074

Abstract

This research aims to determine the impact of using the Search, Solve, Create, and Share (SSCS) learning model on students' science process skills in measurement material. The research method used is a pre-experiment with one group pretest-posttest design. The sample in this study was obtained through simple random sampling technique. Science process skills data were obtained using performance assessments. The results of hypothesis testing using the paired sample t-test can be concluded that th>tt, namely 5.874> 2.056. Based on the statistics, H0 is denied and Hi is accepted, indicating a significant difference between students' average pretest and posttest scores. The rise in student learning outcomes is considered moderate with score 0.304. The effect size test findings received a price of 1.22 which are in the high range. It is possible to conclude that giving treatment using the SSCS learning model has a significant effect on student science process skills on measurement material in the high range.
Pengembangan Bahan Ajar Digital Suhu dan Kalor Berbasis Model PBL Berbantuan Flip Pdf Professional untuk Siswa Fase F SMAN 7 Padang Ilahiyah, Fitratul; Darvina, Yenni; Ratnawulan, Ratnawulan; Ulfa Jhora, Fadhila
Jurnal Ilmiah Profesi Pendidikan Vol. 10 No. 1 (2025): Februari
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jipp.v10i1.3097

Abstract

SMAN 7 Padang telah memiliki berbagai bahan ajar, termasuk bahan ajar digital yang dikembangkan oleh guru untuk proses pembelajaran. Namun, belum ada bahan ajar digital yang berbasis model PBL. Terdapat peluang untuk meningkatkan kualitas pembelajaran dengan bahan ajar berbasis teknologi yang menarik, guna meningkatkan minat, motivasi, dan gaya belajar siswa dalam Fisika. Flip PDF Profesional merupakan software untuk mengonversi materi dalam format file PDF menjadi bentuk buku elektronik (e-book) yang dapat ditambahkan gambar/ilustrasi, animasi, dan video yang menarik. Dalam penelitian yang akan dikembangkan oleh peneliti yaitu pengembangan Bahan Ajar Digital Suhu dan Kalor Berbasis Model PBL berbantuan Flip Pdf Profesional Untuk Siswa Fase-F Pada E-learning SMAN 7 Padang. Jenis penelitian yang digunakan peneliti adalah penelitian dan pengembangan atau yang disebut istilah Research Development (R&D), menggunakan skala Aiken dalam mengolah data. Kesimpulan penelitian yaitu Bahan Ajar Digital Suhu dan kalor berbasis model PBL berbantuan flip pdf professional  untuk siswa fase F telah diperoleh produk yang valid dan layak digunakan setelah melakukan evaluasi oleh ahli dengan rata-rata nilai validitas sebesar 0,85. Hasil pengujian praktikalitas dari produk bahan ajar digital suhu dan kalor berbasis model model PBL berbantuan flip pdf professional untuk siswa fase F telah didapatkan produk yang praktis dan dapat digunakan dalam pembelajaran Fisika. Hal ini dibuktikkan dari penilaian praktikalitas yang diberikan kepada guru dengan rata-rata persentase sebesar 98,9% kategori sangat praktis, kemudian disebarkan kepada satu kelas di kelas XI dengan rata-rata persentase sebesar 88,7% berada dalam kategori sangat praktis.
Analysis of Optical Properties of Graphene Oxide from Bamboo Petung (Dendrocalamus Asper) Synthesized by Modified Hummer Method Indah Safira; Ramli; Yenni Darvina; Fadhila Ulfa Jhora
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.v1i2.20

Abstract

Carbon, hydrogen and oxygen are abundant in the structure of graphene oxide (GO), often known as graphene. In this study, petung bamboo was used in the manufacture of graphene oxide. The aim of this research is to find out how the sintering temperature influences the ability of graphene oxide to absorb waves. The modified hummer method is used to oxidize graphite and produce Graphene Oxide. This research was divided into several parts, namely burning carbonized petung bamboo, production of graphene oxide, and sonication and neutralization of graphene oxide using sintering temperatures of 300°C, 350°C, 400°C and 450°C. The synthesis results were characterized using a UV-Vis spectrometer to obtain an absorption spectrum resulting in a band gap of 2.68 eV-4.38 eV in Petung bamboo at a sintering temperature of 300oC - 400oC, the bandgap increasing as the sintering temperature increased. At a sintering temperature of 400oC - 450oC the band gap value decreases which is influenced by the results of cell changes from refinement which can change the band structure thereby affecting the size of the band gap. The absorption value obtained in the optical properties decreases because the high sintering temperature causes the reaction rate to become faster so that the absorption value becomes lower.
Determination of Thermal Conductivity and Porosity of Composite Panels from Fibers, Bagasse Powder and Polypropylene (PP) Plastic Waste Azca Aryadiva Mahengga; Yenni Darvina; Ramli Ramli; Fadhila Ulfha Jhora
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.v1i3.36

Abstract

Global warming causes temperatures on the earth's surface to increase. High temperatures during the day will make the temperature in the room of the residential house increase. The impact will affect the warmth of residents. One of the causes of the increase in indoor temperature is due to the absorption of solar heat by the components of the walls and roof. One alternative that can be done is the manufacture of composite panels that act as heat insulators using bagasse fibers, bagasse powder and the matrix of polypropylene plastic waste with low thermal conductivity, and high porosity. The composition of the composite varies the percentage of fibers and powders with a fixed percentage of polypropylene plastic waste of 90%. The percentage variation of polypropylene plastic waste of bagasse fiber and powder used is 100%:0%:0%, 90%:10%:0%, 90%:8%:2%, 90%:6%:4%, 90%:4%:6%, 90%:2%:8%, and 90%:0%:10%. Based on the test results, successive thermal conductivity values were 0.226715 W/moC, 0.16241 W/moC, 0.13543 W/moC, 0.09582 W/moC, 0.11457 W/moC, 0.15351 W/moC, 0.18276 W/moC. The porosity values of successive samples were 0.63116%, 2.84024%, 3.36151%, 3.85179%, 3.24880%, 3.09383%, 2.65145%. From the test results, it was obtained that variation 4 had the highest thermal conductivity value with a value of 0.09582 W / moC. while the highest porosity value was obtained in variation 4 with a value of 3.85179%. Composite panels with a variation of 4, and a variation of 5 are optimum variations that can be used as a good heat insulation material.
The use of Electronic Nose in Machine Learning-Based of Jengkol (Archidendron Pauchiflorum) Andkabauseeds (Archidendron Bubalinum) Authentication Mustika, Dian Putri; Darvina, Yenni; Yulkifli, Y; Triyana, Kuwat
PILLAR OF PHYSICS Vol 18, No 1 (2025)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/16783171074

Abstract

This research is based on the fact that this difference in economic value can create a potential motive for counterffeiting, although to date there has been no concrete evidence that counterfeiting between these two types of seeds has occurred. Basically, however, jengkol and kabau are also quite similar physically, especially when they are chopped, making it difficult to distinguish them visually even though they have different odors. The sample preparation tools used are digital scales and knives. While the data collection tools used are electronic nose, personal computer, data logger, usb, drain pump, teflon hose, 100 ml beaker, and acrylic box. The materials used are jengkol and kabau seeds.The method used is experimental, where jengkol and kabau are put into a glass beaker which will be tested using an enose connected using a teflon hose and the output results are seen in the data logger.The model used is support vector machine. The performance of the external test data on the SVM model with RBF kernel can be seen in Figure 9. It can be seen that out of 200 data, there are 2 data that are misclassified. Where from the confution matrices, the accuracy is 99.00, Recall_0 is 99.00, and Recall_1 is 99.00. This shows that the model that has been developed remains stable despite changes in the retrieval method and by being carried out in different weeks.
Effects of Implementing the Discovery Learning Model on Students' Critical Thinking Skills in Fluid Material Aulia, Mhd Reyfanza Aulia; Darvina, Yenni; Desnita, Desnita; Suherman, Dea Stivani
Journal of Innovative Physics Teaching Vol. 3 No. 1 (2025): Journal of Innovative Physics Teaching (JIPT)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jipt/vol3-iss1/87

Abstract

Twenty first century education requires students to possess critical thinking skills as part of their core competencies. This study aims to determine the effect of the Discovery Learning model on improving students’ critical thinking skills in both affective and cognitive domains. The research employed a pre-experimental method with a one-group pretest-posttest design, and the sample was selected using a simple random sampling technique. The instruments used were observation sheets and tests designed to measure critical thinking skills in both domains. The results showed a significant improvement in students' affective and cognitive abilities after the implementation of the Discovery Learning model. In the affective domain, the average score increased from 67.50 to 83.33, with an N-Gain of 0.487 (moderate category) and an Effect Size of 1.174 (high impact). The cognitive domain showed improvement across four critical thinking indicators, with an average N-Gain of 0.660 (moderate) and an Effect Size of 5.633 (high). The hypothesis test result (th = 30.854 > tt = 2.045) indicating a significant influence of the Discovery Learning model on the development of students’ critical thinking skills. Thus, the implementation of the Discovery Learning model is proven effective in enhancing students' critical thinking skills in both affective and cognitive aspects.
Diferensiasi Jahe Emprit Menggunakan Genose 118c Berbasis Principal Component Analysis Pratama, Rayvol Dion; Yulkifli, Yulkifli; Darvina, Yenni; Nofriandi, Alwi; Audia, Washilla
Journal of Comprehensive Science Vol. 4 No. 5 (2025): Journal of Comprehensive Science (JCS)
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/jcs.v4i5.3160

Abstract

Indonesia merupakan salah satu produsen jahe terbesar di dunia, namun kualitas dan keaslian jahe yang beredar di pasaran, khususnya dalam bentuk bubuk, rentan terhadap pemalsuan. Oleh karena itu, diperlukan metode autentikasi yang cepat, akurat, dan efisien. Penelitian ini bertujuan untuk membedakan jahe emprit berdasarkan variasi massa, suhu pemanasan, dan waktu pemanasan menggunakan teknologi electronic nose (GeNose 118C) yang dikombinasikan dengan metode Principal Component Analysis (PCA). Sampel diuji berdasarkan parameter massa (3g, 6g, 9g), suhu (40°C–90°C), dan waktu pemanasan (5–15 menit), kemudian diekstraksi nilai maksimum dari sinyal 8 sensor gas dan dianalisis menggunakan PCA dua dimensi (PC1 dan PC2). Hasil menunjukkan bahwa metode ini mampu membedakan sampel dengan baik: variasi massa (PC1 = 94,59%), variasi suhu (PC1 = 92,17%), dan variasi waktu pemanasan (PC1 = 96,01%). Temuan ini membuktikan efektivitas E-nose berbasis PCA dalam klasifikasi jahe emprit melalui deteksi senyawa volatil. Implikasi penelitian ini penting bagi pengembangan sistem autentikasi rempah-rempah berbasis aroma yang cepat, murah, dan aplikatif, terutama dalam industri pengolahan herbal dan kontrol mutu pangan.
Peran Biostarter EM-4 dan Feses Kuda terhadap Kualitas Biogas dari Serat Ampas Tebu Asfaha, Auzha Hira; Darvina, Yenni
MASALIQ Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i4.6390

Abstract

The rising global demand for energy, particularly from fossil fuel sources, has triggered an energy crisis that necessitates the exploration of alternative solutions. One promising effort is the utilization of renewable energy in the form of biogas, which can be produced from agricultural waste such as sugarcane bagasse and livestock waste such as horse manure. This study aims to analyze the effects of horse manure and the EM-4 biostarter on the quality of the biogas produced. An experimental method was employed using a batch-type digester reactor with three different feedstock compositions: 50% sugarcane bagasse (SB):50% horse manure (HM), 40%SB:60%HM, and 30%SB:70%HM. The parameters observed included initial and final pH, gas pressure, gas temperature, and flame color testing. The results show that the addition of EM-4 biostarter accelerates the gas formation process, yields higher gas pressure, and improves the overall quality of the biogas. Moreover, increasing the proportion of horse manure enhances the decomposition of sugarcane fibers, leading to greater gas volume production. The study concludes that the optimal combination of horse manure and EM-4 biostarter is effective in improving both the quality and quantity of biogas, while supporting waste utilization as a renewable energy source. The practical implications of these findings emphasize the importance of managing the digester environment safely to prevent leakage and external disturbances during biogas production.
Effect of Variations in Banana Frond Fiber Composition with Polyurethane Matrix on Composite Panels Acoustic Properties and Porosity Oktavia, Vini; Darvina, Yenni; Ramli, Ramli; Hidayat, Rahmat
Journal of Experimental and Applied Physics Vol 1 No 1 (2023): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i1.3

Abstract

Noise can damage one's health, affect one's comfort, cause stress, and make activities not run smoothly. Making acoustic materials is one of the efforts made to overcome noise pollution. The material used in this study comes from banana fiber with a polyurethane matrix. This research material is easily and widely available. The advantage of this study is to determine the effect of variations in the composition of banana stem fiber with a polyurethane matrix on the values of the sound reflection coefficient, sound absorption coefficient, sound transmission loss, and porosity. The method used is a hand lay-up with a single microphone tube impedance characterization tool and an analytical balance. In this study, variations in the composition of the composite panels with fiber and matrix variations were carried out, namely 60%:40%, 70%:30%, and 80%:20%. Based on the findings of this study, the higher the sound absorption coefficient, sound transmission loss, and porosity, the lower the sound reflection coefficient. If the frequency used is higher, the values of the sound absorption coefficient and transmission loss increase, while the reflection coefficient decreases for the entire frequency range. If the porosity is higher, the acoustic properties will be better, which is indicated by an increase in the value of the sound absorption coefficient and the value of the sound transmission loss. High porosity will comply with the ISO 11654:1997 standard.
Co-Authors - Afrizal - Rahmi - Ramli - Ramli - Syakbaniah - Yulkifli - Yulkifli Abdul Azis Abdul Aziz Ade Aprilia Ade Usra Berli Afdatul Zikri Ahmad Fauzi Aifah Fauziah Akmam Akmam Alif Yulanda Putri Almunazar, Fauziyah Alqadri, Dheo Alwi Nofriandi Amali Putra Ambran Hartono amira tiara wulandari Andari Oktafiani Anisa Meysi Wardi Annisa Febriani, Annisa Anofa Liona Anwar, Suci Aprilia Cahaya Ari Arfandi arifaldi arifaldi Asfaha, Auzha Hira Asrad Hafizah Asrizal Asrizal Asrizal Atika Dwi Maharani Zuler Audia, Washilla Aulia, Mhd Reyfanza Aulia Azca Aryadiva Mahengga Azura Carolina Harsani Azzahra, Zakia Bella Salsa Bella Sukma Putri Chairunnas Chairunnas Cici Ramayanti Dara Putri Pratama Desnita Desra Yarsina Dicko Maulana Syahdan Diffa Azilia Dila Alhumaira Dola Afriyenti Edi Sanjaya Elsa Imelda Elsa Okta Memori Elsa Rahmayuni everly aberta Fadhila Ulfa Jhora Fadilla Septiani Fadillah Ulfah Fakhrur Rhozy Fani, Meylin Sir Fanny Rahmatina Rahim Fatni Mufit Fatni Mutfit Fauziyah, Faadhilah Febrian Syah Febrian, Nanda Festiyed Fio Adella Illahi Firda Annisa Fitrah Ayu fitri rahmi Fitria Murti Fran Surya Andi Fredy Pratama Frima Suci Agustia Fuja Novitra Gina Fadilah NST Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi, - Gustika Yonanda Hamdi Rifai Hardina, Yuli Harman Amir Hasya Syahmi Hazrati Ashel Hersha Hanifa Hidayati Hidayati Hidayati Hidayati Hidayati Hidayati Hifzi, Zudiya Hilmi Rizki Anjani Hrp, Abdul Maulub Hufri Hufri Ihsania Ikrima Kinanti Ilahi, Fitratul Indah Safira Indah Septia Ningsih Indah Tri Handini Indri Syukra Innes Andriani Iryani Iryani Ismathul Dinny Jasmine, Alifa Jhora, Fadhila Jhora, Fadhila Ulfa Jhora, Fadhilla Ulfa Kasih Syirpia Khairunnisa Khairunnisa Kuwat Triyana Lestra, Dila Ayu Letmi Dwiridal Lidya Agraini Lucya Sinurat Lusi Oktavia Masril Masril Masril Masril Masril Masril Masril Masril masril masril Melani Alvino Miftahurrahmah Miftahurrahmah, Miftahurrahmah Muhammad Ikmal Muhammad Rivai Murtiani Murtiani Murtiani Murtiani Mustika, Dian Putri mutia faizah apriani Mutia Risma Mutia Yussavel Navis Nabila, Aliya Nadia Ardianti Nadia Ramadhanty Nadila Putri Bungsu Nadya Aztifa Nadya Yunestika Nawiyah, Nawiyah Nazifah, Naurah Nia Nursurila Nidya Yulfriska Nidya Yulfriska Novelia Prima Nur Anisa Nur Sahfitri Nurhasanah Nurhasanah Nurhijjah Tiur S Nurmala Sari Lubis Oktavia, Vini Onny Gustira Pakhrur Razi Pertama, Indri Saputri Pratama, Rayvol Dion Pratiwi Mailisa Prima Nora Ananda Puput Mulya Sari Pusri Mela Putra Adil Putra, Amali Putri Diana Putri Dwi Sundari Putri Rasti Ramadhani Radha Firaina Rahma Tilla Dwi Lestari Rahma Yeni Rahmadini, Fadhilla Rahmat Hidayat Rahmat Hidayat Rahmi Zulva Ramadhani, Dinda Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli, - Rara Nur Rida M.Y Ratnawulan . Renol Afrizon Resti Novela Retna Junia Revi Febrina Sari Ria Monica Rifi Wasrika Rima Melani Putri Rio Anshari Riolin Putri Artiwi Riri Jonuarti Riri Raihannil Jannah Riyasni, Selma rizka fauziah Rizki Rizki Romizah Marta Salma Amalia As Shidiq Santika, Viera Alvio Sari, Mona Berlian Septia, Zahwa Setivawani, Andrisa Shinta Kumala Silmi Hidayatullah03 Silvi Trisna Silvi Yulia Sari Siti Riva Darwata Slivi Yulia Sari Solly Aryza Sonia Nur Riza Sovia Yulianti Srisa Oktaweri Suci Wahyuni Suherman, Dea Stivani Suryani Fadhilah Syafri, Syafri Syafriani - - Syafriani Syafriani Syafriani Syafriani Syafriani Syafriani Syafrinaldi Syafrinaldi Syahputra , Ilham Syair Nandi Tiwi Novalia Syahari Tri Agunaisy Tria Sukma Sandi Trio Junira Fernando Ulfa Jhora, Fadhila Ulfa Jhora, Fadhilla Ully Nuraidina Ummiatul Fitri Vanessa Febta Sindani Varadila Sahanaya wahyu dilla abdullah Wahyudil Hayat wahyuni hafnisyah Wahyuni Satria Dewi Widara, Rofifah Windri Suci Gaitari Yeni Mustika Sari Yogi Putra Yohandri Yohandri Bow Yolvi Oktaviani Yona Sri Mantia Yosi Febriani Yudha, Fauzan Syafril Yulhendri Yulhendri Yulia Febrina Yulia Sari, Silvi Yulkifi Yulkifi Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli, Y Yunita Ela Saputri Yuri Yanti Yurnetti Yurnetti Yurnetti Yurnetti Yurnetti, Yurnetti Zakiya, Zara Zara Zakiya Zoni, Muhammad Ari Zulhendri Kamus Zulma, Degito