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All Journal Jurnal Penelitian dan Pembelajaran Fisika Jurnal Pendidikan IPA Indonesia Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Science and Technology Indonesia JIPF (Jurnal Ilmu Pendidikan Fisika) Jurnal Penelitian Pendidikan IPA (JPPIPA) Momentum: Physics Education Journal JURNAL EKSAKTA PENDIDIKAN (JEP) JPF : JURNAL PENDIDIKAN FISIKA JURNAL PENDIDIKAN TAMBUSAI International Journal of Educational Dynamics (IJEDS) Eksakta : Berkala Ilmiah Bidang MIPA Jurnal Lentera Pendidikan Pusat Penelitian LPPM UM Metro JURNAL PENDIDIKAN MIPA Pelita Eksakta Jurnal Ilmiah Profesi Pendidikan Natural Science: Jurnal Penelitian Bidang IPA dan Pendidikan IPA Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Al-DYAS : Jurnal Inovasi dan Pengabdian kepada Masyarakat Journal of Innovative Physics Teaching (JIPT) Physics Learning and Education Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Journal of Experimental and Applied Physics

Ratnawulan .

Departement Of Physics, Universitas Negeri Padang, Padang, 25132, Indonesia

Author-ID : 3501882

Agriculture, Biological Sciences & Forestry Astronomy 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 Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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THE EFFECT OF PH VARIATIONS ON THE STRUCTURE OF THE MnFe2O4/PS NANOCOMPOSITE LAYER AS SELF CLEANING Ipal Ipal; - Ratnawulan
PILLAR OF PHYSICS Vol 14, No 2 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12199171074

Manganese is a metal element found in group VII, has an atomic weight of 54.93u, with a boiling point of 20320˚C, while the melting point is 12470˚C, and has a reddish-gray color. Iron (III) oxide (Fe2O3) or also known as hematite or maghemite iron ore, iron hematite (α – Fe2O3) is a simple oxide which has a hexagonal (rhombohedral) structure and has the R3c space group. Manganese was used as reinforcement in this research, while the matrix used was polystyrene. In this study, 5 variations of pH MnFe2O4/PS, namely 5,6,7,8 and 9 nanocomposites were synthesized using the spin coating method with manganese oxide (MnO2) and iron ore (Fe2O3) precursors. The composite gel is dropped on the glass substrate then the drying process is carried out in an oven. MnFe2O4/PS nanocomposites were characterized using X-Ray Diffraction (XRD). giving acid and alkaline solutions affects the size of the crystals, when adding a base (25% Na4OH) the crystal size becomes small while when the acid is added (100% CO3COOH) the crystal size is larger. : pH 8: pH 9 an increase in crystal size and grain size occurs.

The Effect of Heavy Metal Pollutants on Bioluminescence Intensity of Luminous Mushrooms (Nenothopanus sp) Witriani Marvinatur Ihsan; Ratnawulan Ratnawulan
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 21 No. 2 (2020): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

In the South Coastal Forest area, West Sumatra, a luminous mushroom with the species Neonothopanus Sp. This research was conducted with the aim of seeing the effect of heavy metals on the bioluminescence reaction of luminous mushrooms. Starting from the effect of heavy metal concentrations on the intensity and inhibition coefficient of luminous mushroom biolumination. From the measurement results, the maximum intensity value of luminous mushrooms is 499.6 au occurring at a wavelength of 505 nm. At a wavelength of 505 nm, visible light is produced in green. The results obtained are in accordance with observations, because the light emitted by the glowing mushroom is green. If the concentration of heavy metals is greater, the intensity of the bioluminescent fungus (Neonothopanus sp) will decrease. The type of heavy metal affects the intensity of the fungus biolumination. The greatest decrease in intensity occurred in copper (Cu) and iron (Fe), zinc (Zn) and lead (Pb). If the heavy metal concentration is greater, the inhibition coefficient will be smaller. The greatest inhibition coefficient due to the presence of heavy metals occurs in copper (Cu) then iron (Fe), zinc (Zn) and the smallest is lead (Pb).

Efektivitas Buku Siswa IPA Terpadu dengan Tema Energi dalam Kehidupan berbasis Materi Lokal Menggunakan Model Integrated untuk Meningkatkan Kecakapan Abad 21 Zaitul Hidayat; Rahima Syabrina Sarmi; Ratnawulan Ratnawulan
JURNAL EKSAKTA PENDIDIKAN (JEP) Vol 4 No 1 (2020): JEP : Jurnal Eksakta Pendidikan
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jep/vol4-iss1/415

The current science student book is expected to have learning and assessment in it that is relevant to the demands of education now that is in accordance with 21stcentury learning that contains is critical and problem solving skills, creativity and innovation skills, collaboration skills, and communication skills it aims to develop the potential, talents and interests of students to have competent student who are ready to face global challenges. This article aims to evaluate the science student book with the theme of energy in life based integrated local materials using integrated models 21st century learning. Evaluation consists of testing the effectiveness of 21st century learning student’s skill after using this science student book. Thus, the results of study indicate that science student book with the theme of energy in life based integrated local materials using integrated models 21st century learning which is effectively used in student learning in class. Based on these result, it appears that science student book with the theme of energy in life based integrated local materials using integrated models can improve student’s High Order Thinking Skill (HOTS)

The Effect of Using Discovery Learning Model in High School Physics Learning: A Meta-Analysis Dwi Putri Ramadhani; Ratnawulan Ratnawulan
Jurnal Pendidikan Fisika Vol 10, No 2 (2022): PENDIDIKAN FISIKA
Publisher : Universitas Muhammadiyah Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26618/jpf.v10i2.6545

Discovery learning is one of the learning models recommended by the 2013 Indonesian curriculum to meet the demands of 21st-century learning. The purpose of this study is to determine the effect of the discovery learning model based on class level, learning materials, student learning competencies, and learning media used. This type of research is a meta-analysis by calculating the value of effect size (ES). The data collection technique in this study is using documentation techniques. The analytical techniques used are quantitative analysis for value and qualitative analysis to analyze research data. The study used 26 articles consisting of 21 national articles and 5 international articles. The results of this study indicate that, first, the discovery learning model is more effectively applied to class X with an ES of 1.38, which is in the high category. Second, the discovery learning model is more effectively applied to measurement material with an ES of 3.24, which is in the high category. Third, the discovery learning model is more effective for increasing learning competence in the form of mastery of concepts and critical thinking skills of students with an ES of 1.70, which is in the high category. Finally, the tracker software media is more effective in learning physics with ES 2.32, which is in the high category. Overall, it can be concluded that the discovery learning model has a positive effect on physics learning.

DIFFICULTY ANALYSIS OF STUDENTS OF CLASS X SMAN 3 SUNGAI PENUH IN SOLVING PHYSICS PROBLEMS IN THE FORM OF GRAPHIC IN STRAIGHT MOTION MATERIAL Korry Nilyani; - Ratnawulan; - Gusnedi; Renol Afrizon
PILLAR OF PHYSICS EDUCATION Vol 14, No 4 (2021)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12133171074

This study aims to determine the difficulties of students in solving physics problems in the form of graphs and profiles of students' difficulties in the material of straight motion. This research method is qualitative research. The population in this study were students of class X Science at the state senior high school 3 Sungai Penuh who had studied the material of straight motion. The sampling technique used is Simple Random Sampling, from this technique one trial class was selected, namely X Science 2 and one class as a sample, namely class X Science 1. The data collection method was diagnostic tests and was supported by interview results. The analysis was carried out using descriptive percentages.The results show that students' ability to solve physical problems with graphs has a low percentage of interpretation ability of 40.61%; interpolation ability of 30.6%; extrapolation ability of 30.46%; and the ability to transform by 39.65%. The student difficulty profile in this study based on the minimum criteria of mastery learning was still having difficulty for all indicators with an average of weak categories. The student's difficulty profile on the material profile is still having difficulties for all sub-materials with an average of weak categories. In the difficulty profile based on prerequisite knowledge, the proportion of students who have difficulty in determining the area of flat shapes is 51.72% including the medium category, the percentage of students' difficulty in arithmetic operations is 66.05% including the high category, the proportion of students' difficulties in linear equations is 72.41% included in the high category.

IDENTIFICATION OF STUDENT'S MISCONCEPTIONS ON STRAIGHT MOTION MATERIALS USING FOUR-TIER DIAGNOSTIC TEST AND CERTAINTY OF RESPONSE INDEX (CRI) Izzati Salsabilla Madina; Ratnawulan R; Silvi Yulia Sari; Putri Dwi Sundari; Tantri Mayasari
PILLAR OF PHYSICS EDUCATION Vol 15, No 1 (2022)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12658171074

Student’s understanding that is not in accordance with scientific concepts becomes an obstruction in the process of studying and effect on the result of studying itself. Therefore, an effort is needed to fix and find out the students’ misconception. Therefore, this study aims to identify the level of student’s concept understanding and misconceptions on the material of straight motion at SMAN 11 Padang, SMAN 13 Padang, and SMAN 16 Padang. This study is the descriptive research by using quantitative approach. The instrument used is the Four-Tier Multiple Choice Test with a Certainty of Response Index (CRI) scale. The study population was all students of class X at SMAN 11 Padang, SMAN 13 Padang, and SMAN 16 Padang in the academic year 2021/2022. The simple random sampling technique is used in this study as much as 20% of the total population, so the number of samples in this study was 135 students. The results indicate that the level of student’s concept understanding on the material of straight motion at SMAN 11 Padang, SMAN 13 Padang, and SMAN 16 Padang was in the low category with the level of misconceptions in the medium category. At SMAN 11 Padang the percentage of understanding concepts is 14.1% and misconceptions is 44.9%. At SMAN 13 Padang the percentage of understanding concepts is 13.2% and misconceptions is 47.7%. And at SMAN 16 Padang the percentage of understanding concepts is 12.6% and misconceptions is 55.7%. It can be stated that the level of student’s concept understanding is more dominant in the category of misconceptions in straight motion material.

Effect of The Volume of Banana Fiber As A Polymer Composite Amplifier With Polyester Resin Matrix On The Sound Absorption of Acoustic Materials rizka fauziah; - Ramli; Yenni Darvina; - Ratnawulan
PILLAR OF PHYSICS Vol 15, No 1 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12561171074

Research has been carried out on the banana fiber effect as a polymer composite amplifier with polyester resin matrix on the sound absorption of acoustic materials. Sound Absorber material is made with a variation in the volume of banana fiber that is different from polyester resin. The volume of banana fiber and polyester resin used is 15% Fiber: 85% Polyester Resin, 20% Fiber: 80% Polyester Resin, 25% Fiber: 25% Fiber: 75% Resin Polyester, 30% Fiber: 70% Polyester Resin, 35% Fiber: 65% Polyester Resin. So when made composite then the amount of banana fiber used and polyester resin is 100%. Research methods are carried out in the collection of banana fiber, composite manufacturing and testing of sound absorption properties using impedance tubes. The testing of coefficient sound reflection and also sound absorbance coefficient testing is done using sound level meter and signal generator by reference to principle the method of tube impedance via approach to the acoustic box. The banana fiber composite result and polyester resin are able to reflect the sound of highest which is 0.44 in a frequency 500 Hz with fiber 15%. While lowest sound reflection coefficient is 0.06 at a frequency of 8000 Hz and fiber 35%. While in the test the highest value absorbance coefficient that absorbs sound is = 0.94 at fiber volume 35%, and frequency 8000 Hz, while the lowest sound coefficient is 0.56 in fiber 15% and frequency 500 HZ

Development of Students’ Worksheets Based on Problem-Based Instruction (PBI) of Grade X Senior High School Elvira Diana. S; I Made Arnawa; Ratnawulan Ratnawulan
International Journal of Educational Dynamics Vol 2 No 1 (2019): International Jurnal of Educational Dynamics (IJEDs)
Publisher : Postgraduate School, Universitas Negeri Padang

This study is intended to produce senior high school students' mathematical worksheets based on valid, practical and effective problem-based instruction. Its effectiveness can be seen from the increase in positive activity and student learning outcomes. It is research and development by using the Plomp model by using three stages, namely the preliminary research, development or prototype phase, and assessment phase. The subjects were students of class X SMAN 1 Lembah Gumanti. The research instruments were interview guidelines, field notes, validation sheets, student and teacher response questionnaires, students’ activity observation sheets and learning achievement tests. This research has produced students’ worksheets that are valid, practical and effective. Students and teachers give a good response of students’ worksheet because it helps them in the learning process. Students can learn efficiently and understand the mathematical concepts easily. Students’ worksheet can also motivate students in learning so that there is enhancement between positive activities and learning outcomes.

Effect of Calcination Temperature on Microstructure, Porosity and Hardness of Cao/Sio2 Nanocomposites for Bone Implants Wardatul Ullya; Riri Jonuarti; - Ratnawulan
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13872171074

This research is a study on the effect of calcination temperature on microstructure, porosity, and hardness of CaO/SiO2 nanocomposites for bone implants made from natural materials of pensi shells and silica sand. The purpose of this study was to determine the effect of variations in calcination temperature on the morphological analysis of structural form, porosity, and hardness of CaO/SiO2 nanocomposites in samples for biomaterials and to determine whether CaO/SiO2 nanocomposites derived from pensi shells and quartz sand are possible to be applied as biomaterials. The results showed that the effect of variations in calcination temperature on the microstructure of bone implant samples was that the higher the calcination temperature would affect the microstructure's shape on the surface of the model where the surface formed was widening, and the grain size was getting smaller. In the porosity, it can be seen that there is diffusion between one grain and another. The grains melt with each other and close the pores from the outside, resulting in compaction at a temperature of 1000°C with a porosity value of 0.005% and the best hardness value of 4.8 kg/mm2.

The Effect of Fly Ash Composition on The Hydrophobic Absorption, and Strength Properties of Concrete Asri Vauzia; - Ratnawulan
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12978171074

The use of concrete in buildings that indicate direct contact with water such as concrete preparation and roof requires waterproof concrete. The air entering the concrete through the capillary tubes formed during the formation process can be reduced by reducing the diameter of the microcapillary. Fly Ash is an additive that has seeds that are smaller than cement. After the fly ash in the concrete mixture reacts with cement and water, the diameter of the microcapillary formed will be smaller. The purpose of this study is to determine the effects of variations in the composition of flying ash on the hydrophobic, absorption, and concrete strength. Variations in the composition of flying ash are 0%, 5%, 10%, 15%, and 20%. Based on the test, the percentage of absorption in concrete aged 7 reached an optimal value at 5% percentage of flying ash with a value of 0.363%, whereas in concrete aged 14 days optimal value is obtained at the percentage of flying ash 5% with a value of a 0.5%. The biggest contact angle for the variation of 0% flying ash at the age of 7 days is 128.79⁰ and the lowest value for the variation in flying 15% is 100.41⁰. The highest compressive strength value occurs in the percentage of flying ash at 0% is 30,945 in 7 days of concrete age, and the lowest concrete compressive strength value is the percentage of fly ash at 15%, namely 16.05 MPa for concrete age 14 days

Co-Authors - Hamdi AA Sudharmawan, AA Abdul Aziz Adilla, Rika Afrilla, Sonya Ahmad Fauzi Ahmad Fauzi aisyah fadillah Akmam Akmam Al Naim, A. F. Almunazar, Fauziyah Amelia Roza Haqu Amirullah, Fajar Fikri Anisa Janna Anisa Surya Annisa Kurniawati Aprianti, Rika Aria Ulfa Aris Alfikri Arni Sopianti Asri Devialita Asrizal - Betty Mizarwan Bizar al furqan Dafri Zaldi Dani Gustaman Syarif Delianis Pringgenis Desnita Desti Yuspita Sari Deswita, Pipi Devana Dhiya Purnama Sari, Salsabila Dian Septiana Dila Juliawati Djusmaini Djamas Doni, Rahma Dwi Putri Ramadhani Elvira Diana. S Emiliannur Emiliannur Ernita Susanti Ernmaniati Ramli Fadhila Ulfa Jhora Fadli M Fanny Rahmatina Rahim Faridah Lisa Supian Fatni Mufit Fauzi Ahmad Muda Fauziyah, Faadhilah Febriona, Fhica Febriya, Dhea Fitri, Hidayatul Forni, Francesca Fran Surya Andi Fuad Sofaturahman Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi, - Gusriandi, Dedi Gustaman Syarif Gusti, Dian Arima Gustika Yonanda Hamdi Rifai Hardina, Yuli Harman Amir Hayyu Yumna Hidayat, Zaitul Hidayati Hidayati Hidayati Hidayati Hidayatul Lisma, Rahmi Hosman, N. J. Hufri Hufri I Made Arnawa Idam Arif Ilahi, Fitratul Intan Purnama Yani Ipal Ipal Irna Humairah Ismira, Ismira Izzati Salsabilla Madina Jasmine, Alifa Jhora, Fadhila Jhora, Fadhila Ulfa Kharisma Marta Judenta Korry Nilyani Lailatul Rahmi Lathifa Zonesya Putri Letmi Dwiridal Letmi Dwiridal Lia Rifka Septiana M. Bayu Ihsan Maharani Erika Putri Maharani, M Maritza Syalsabilla Masril Masril Mayasari, Tantri Mira Syuriyani Mohd Azmi, M. S. Muhammad Ridwan Azizi Mutiara Kusuma Febriwanti nabila aulia rahma Nadia Raisa Aryani Nadiyyah, Khoirotun Najmiatul Fajri Naspin, Desi Ariyanti Nessa Aqila Novella Febriana Nur Azizah Nurhabibah Nasution Nurhayati Nurhayati PAT, Anggi Angelina PAT Angelina Putri Dwi Sundari Putri, Sri Fany Mulya Rahima Syabrina Sarmi Rahmad Efendi Rahmat Hidayat Rahmat Hidayat Rahmat Hidayat Raisa, Nadia Ramadhani, Dinda Ramli Ramli Renol Afrizon Renold Fernanda Retna Junia Rifka, Lia Riri Camara Putri Riri Jonuarti Riri Jonuarti Riri Yandari Rita Iranie Riyasni, Selma rizka fauziah Rizki Fernanda Rosa Ayuni Utami Rosi Selfia Putri Santika, Viera Alvio Saputri, Ririn Hustia Sarimai Sarimai Sarmi, Rahima Syabrina Septia, Zahwa Silvi Yulia Sari Sinthia Dwi Jayanti Sisi Gusti Putri Sofaturrohman, Fuad Suherman, Dea Stivani Sumanti, Syahputri Supian, F. L. Syafri Syafri Syafriani Syafriani Syafriani Syafriani, - Syahputra , Ilham Syakbaniah Syakbaniah Syalsabilla, Maritza Syuriyani, Mira Tho, S. W. Triana Dwi Restika Trisia Meidini, Ella Ulfa Jhora, Fadhila Ulfa Jhora, Fadhilla Ulfa Jhora, Fadila Urwatil Wuskha Usmeldi Usmeldi Vauzia, Vauzia Veni Wahyuni Vonny Tinedi Wardatul Ullya Widiasih, Widiasih Witriani Marvinatur Ihsan Wong, Y. Y. Yanna, Fitri Yedho Syahadha Yenni Darvina Yola sri Wahyuni Yuliani, Kurnia Dwi Yulianti, Lastri Yuliza Noerman, Kiki Yulkifli Yulkifli Yurnetti Yurnetti Zaitul Hidayat Zakirman Zaturrahmi Zaturrahmi Zoni, Muhammad Ari Zulhendra Zulhendra Zulhendri Kamus

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