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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) JURNAL PENDIDIKAN TAMBUSAI Journal of Civil Engineering and Vocational Education Journal of Experimental and Applied Physics
Jhora, Fadhila Ulfa
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Physics Social Sciences Transportation

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Effect of Polyvinyl Alcohol (PVA) Concentration and Stirring Time on The Mechanical Properties of Biodegradable Plastic from Kepok Banana Peel Starch Doni, Monica Anatasya; Jonuarti, Riri; Wulan, Ratna; Jhora, Fadhila Ulfa
CIVED Vol. 10 No. 3 (2023): September 2023
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/cived.v10i3.499

Abstract

One solution is to use bioplastics, which can replace synthetic plastics that are difficult to decompose. Starch is one of the materials used in the manufacture of bioplastics because it is naturally degradable. However, bioplastics made from starch tend to be brittle and easily damaged, so additional materials are needed to overcome this problem. Polyvinyl alcohol (PVA) is one of the materials used in the manufacture of bioplastics because it has properties that can be degraded naturally, is non-toxic, and is able to form good quality plastic films. This study aims to examine the effect of PVA concentration and stirring time on the mechanical properties of biodegradable plastic derived from kepok banana peels. This study used a completely randomized design with three variations of PVA concentration (3%, 4%, and 5%) and three variations of stirring time (25 minutes, 35 minutes, and 45 minutes). The results showed that at a PVA concentration of 5% with a stirring time of 45 minutes, bioplastics showed the best quality with a tensile strength value of 2.25 MPa, the best elongation at break was 416%, and the best elasticity was 0.541. In biodegradation, all samples were completely degraded within 7 days. It can be included that the addition of PVA concentration and the length of stirring effecth the mechanical properties of bioplastics but not on the biodegradation test.
Analysis of the Influence Mass Variations of Banana STEM Fibres with Polypropylene (PP) Matrix on Accoustic and Porosity Properties Santika, Viera Alvio; Darvina, Yenni; Ratnawulan, Ratnawulan; Jhora, Fadhila Ulfa
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.54

Abstract

Noise pollution is sound that you do not want to hear or is known as noise. If people hears loud noises continuously, it can disrupt hearing function. Therefore, it is necessary to have noise control by making an acoustic material that will be coated on the room's walls. A cheap and environmentally friendly alternative material is using banana stem waste from the fibre taken and with polypropylene as a fibre binder. This research aims to determine the effect of variations in the mass composition of banana stem fibre with the matrix polypropylene on the value of the acoustic properties and porosity, and determine the relationship between porosity with acoustic properties. Characteristics of the acoustics that will be measured are sound absorption coefficient, sound reflection coefficient, and transmission loss. The method used is using a characterizaton tool with one microphone impedance tube and porosity test tool with a digital scale. Acoustic material is made by varying the mass percentage in the ratio of polypropylene and midrib fibre banana, namely 90%:10%; 85%:15%; 80%:20%; 75%:25%; and 70%:30%. Based on the research results, it is known that the more fibre composition in the composite, the sound absorption coefficient values, transmission loss values, and porosity values were higher produced, but the resulting sound reflection coefficient value was lower. Then, the relationship between porosity with acoustic properties was that the higher porosity value, the resulting sound absorption coefficient and transmission loss value are higher too. However, the resulting sound reflection coefficient value was getting lower.
Effect of The Camposition Nanocomposite Fe3O4-Graphene Oxide on Optical Properties Synthesized from Coconut Shell Charcoal Angraini, Sri; Gusnedi, Gusnedi; Jonuarti, Riri; Jhora, Fadhila Ulfa
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.60

Abstract

This study aims to determine the effect of Fe3O4 nanocomposite composition: Graphene Oxide on the optical properties of Fe3O4 Graphene Oxide nanocomposite by obtaining the results of absorbance value, transmittance, reflectance, and band gap value based on UV-Vis test. Graphene oxide used in this study is made from biomass waste coconut shell charcoal which contains carbon elements, most of whose pores are still covered by hydrocarbons and other organic compounds and the charcoal is used as activated carbon through an activation process, then synthesized using the modified hummers method. In this study, three variations were used, namely 20%: 80%; 30%; 70%; 40%: The results show that the effect of Fe3O4-Graphene Oxide Nanocomposite Composition on coconut shell waste using a UV-Vis spectrometer, the absorbance value of each sample was obtained in the range of 200-290 nm.. In the results of gap energy research with 3 variations respectively 3.269 eV, 3.79 eV, 3.91 eV obtained that if the variation of graphene oxide is higher than the value of the energy gap produced is smaller, so the addition of graphene oxide from coconut shell waste has the effect of reducing the energy gap of graphene oxide.
Desain E-LKPD Pencemaran Lingkungan Terintegrasi Model PBL untuk Menstimulasi Literasi Lingkungan Peserta Didik Raysa, Afrila; Asrizal, Asrizal; Yurnetti, Yurnetti; Jhora, Fadhila Ulfa
Jurnal Pendidikan Tambusai Vol. 8 No. 3 (2024)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

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

Abstract

Pembelajaran abad 21 menuntut peserta didik untuk mempunyai kemampuan literasi yang baik. Mengacu studi pendahuluan, literasi lingkungan peserta didik masih rendah. Satu di antara cara untuk menangani masalah ini yakni menyediakan bahan ajar inovatif pada pembelajaran. E-LKPD pencemaran lingkungan terintegrasi model PBL menjadi aspek penting untuk menstimulasi literasi lingkungan peserta didik. Tujuan dari penelitian ini ialah untuk menghasilkan e-LKPD yang valid serta praktis. Jenis penelitian ini ialah Design Research (DR) memakai model pengembangan 4D yang mencakup tahap pendefenisian (define), tahap perancangan (design), tahap pengembangan (development), serta tahap penyebaran (disseminate). Objek penelitian yaitu E-LKPD pencemaran lingkungan terintegrasi model PBL untuk menstimulasi literasi lingkungan peserta didik. penelitian ini dibatasi sampai tahap development. Guru dan peserta didik berperan sebagai subjek yang dapat mengevaluasi kepraktisan produk. Instrumen yang dipakai untuk pengumpulan data yakni uji validitas serta praktikalitas. Teknik analisis data yang dipakai yakni teknik analisis statistik deskriprif. Dari hasil analisis data yang dilaksanakan, diraih dua hasil penelitian. Hasil penelitian pertama memperlihatkan terkait e-LKPD memiliki validitas sebesar 85,9 yang tergolong pada kategori sangat baik. Hasil penelitian kedua memperlihatkan terkait kepraktisan e-LKPD yang dinilai oleh guru serta peserta didik mempunyai nilai 85,7 serta 90,7 yang tergolong pada kategori sangat baik. Hasil penelitian ini memperlihatkan terkait e-LKPD pencemaran lingkungan terintegrasi model PBL valid dan praktis, sehingga masuk pada kategori sangat baik untuk dipakai pada pembelajaran fisika.
Pengaruh Variasi Temperatur dan Waktu Pembakaran Eceng Gondok terhadap Kadar Silika dan Sifat Mekanik Beton Silika Yulifarma, Rika; Jonuarti, Riri; Yohandri, Yohandri; Jhora, Fadhila Ulfa
Jurnal Pendidikan Tambusai Vol. 9 No. 2 (2025): Agustus
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v9i2.31030

Abstract

Penelitian ini mengevaluasi pengaruh suhu dan waktu pembakaran eceng gondok terhadap ukuran partikel, pola difraksi amorf, kandungan silika, serta pengaruhnya terhadap kuat tekan, densitas, dan sudut kontak beton. Abu eceng gondok yang kaya silika dapat digunakan sebagai bahan tambahan beton karena sifatnya yang pozzolan, meningkatkan kekuatan dan daya tahan. Penelitian ini menggunakan suhu 500°C dan 600°C dengan waktu pembakaran 90 dan 150 menit. Analisis Scanning Electron Microscope (SEM) menunjukkan nanopartikel eceng gondok berukuran kurang dari 1 nm. X-Ray Diffraction (XRD) menunjukkan pola amorf dengan puncak pada 2θ sekitar 21,8°. X-Ray Fluorescence (XRF) menunjukkan bahwa pembakaran pada suhu 600°C selama 150 menit menghasilkan kandungan silika tertinggi sebesar 84,96%. Dengan demikian, kondisi optimal adalah 600°C selama 150 menit. Beton dengan abu ini menunjukkan penurunan kuat tekan sebesar 0,7% (di bawah 1%), namun kekuatannya meningkat pada umur 14 hari, memenuhi standar mutu. Sudut kontak beton silika berumur 14 hari adalah 98,663°, dan densitas beton normal mencapai 2354,077 kg/m³. Oleh karena itu, penggunaan abu eceng gondok dalam produksi beton layak dan menguntungkan.
Enhancing Science Learning Activities through the Implementation of Discovery Learning and Teaching at the Right Level Method Ismail, Irfan Ananda; Jhora, Fadhila Ulfa; Qadriati, Qadriati; Insani, Munadia
Jurnal Penelitian Pendidikan IPA Vol 10 No 4 (2024): April
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i4.7359

Abstract

Education plays a vital role in cultivating qualified future generations, with active student participation serving as an indicator of effective learning processes. Preliminary observations at SMP Negeri 32 Padang revealed low engagement levels in science classes, prompting the need for interventions to boost students' involvement. The primary objective of this classroom action research was to enhance student engagement in science learning activities through implementing the Discovery Learning model and Teaching at the Right Level approach in a Grade 8 classroom at SMP Negeri 32 Padang. The study was conducted over three cycles, each consisting of planning, acting, observing, and reflecting phases. Data on student engagement in science learning activities was collected through observations using a rubric. The initial data in Cycle I revealed low engagement at 36.72%. After implementing interventions integrating Discovery Learning activities and personalized scaffolding based on students' ability levels in Cycles II and III, student engagement progressively increased to 45.76% and 62.28% respectively. Surveys and interviews indicated students found the learner-centered, inquiry-based activities more enjoyable and effective for understanding compared to traditional instruction. The findings demonstrate the potential of combining Discovery Learning and Teaching at the Right Level methods to significantly improve learning participation by stimulating intrinsic motivation through autonomous exploration while providing individualized support. The research offers practical strategies for enhancing science education engagement and contributes to the Kurikulum Merdeka goals of fostering participatory, flexible learning environments tailored to students' unique needs
Co-Authors Angraini, Sri Asrizal Doni, Monica Anatasya Gusnedi Gusnedi Insani, Munadia Ismail, Irfan Ananda Qadriati, Qadriati Ratna Wulan Raysa, Afrila Riri Jonuarti Santika, Viera Alvio Yenni Darvina Yohandri Bow Yulifarma, Rika Yurnetti, Yurnetti