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All Journal Jurnal Rekayasa Mesin Jurnal Komposit : Jurnal Ilmu-Ilmu Teknik Sipil Entalpi Pendidikan Kimia SEARCH: Science Education Research
Coa, Sri Astuti Rahman
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Chemistry Civil Engineering, Building, Construction & Architecture Education Engineering Mechanical Engineering Social Sciences Transportation Other

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Pemanfaatan Limbah Serat Alam Kulit Buah Kelor Sebagai Papan Komposit yang Diperkuat Polimer Unsaturated Polyester Resin Jayadin, Jayadin; Nisa, Kartini Rahman; Siti Zuraidah; Leto, Kristina Tresia; Coa, Sri Astuti Rahman; Nurhadyati, Nurhadyati; Mujiburohman, Muhammad; Hikmatiar, Hamzarudin
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 2 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i2.17786

Abstract

The use of Composite Materials with natural fiber reinforcement is starting to be widely known in the manufacturing industry, environmentally friendly and recyclable materials. Composites are made to obtain lightweight structures, have higher strength or stiffness, energy absorption and design, have low prices and natural fibers are also easy to obtain, especially moringa fruit skin which is very abundant in the East Nusa Tenggara region, especially in Sikka Regency. This study aims to determine the Bending strength, impact energy and seawater absorption capacity. The research materials are moringa fruit skin fiber and polyester resin. Moringa fruit skin fiber is a waste that is rarely used so it can be a serious waste. This specimen is used with the Cold Compressing Molding method (Molds that are loaded at room temperature). The results of the study showed optimal conditions at a volume fraction of 25%, providing the highest Bending strength of 8,888 MPa, the highest impact energy of 0.196 J / mm2, and the lowest seawater absorption value of 0.79%.
Utilization of Moringa Fruit Peel Waste and Sawdust as Hybrid Composite Boards with Polyester Resin Matrix Leto, Kristina Tresia; Jayadin; Ridwan, Mastura; Coa, Sri Astuti Rahman; Nisa, Kartini Rahman; Mujiburohman, Muhammad; Ismiralda, Ismiralda; Farizi, Zakaria Al
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.6941

Abstract

Environmental damage, previously considered a local problem, has now developed into a global issue, with waste becoming an increasingly pressing issue, especially in developing countries. Inadequate waste management has the potential to cause serious impacts on environmental sustainability and human health. One type of waste that has not been optimally utilized is moringa fruit peel waste and wood sawdust. This waste often causes soil and air pollution because it is left to pile up and burned. Therefore, this study aims to develop a Hybrid composite that combines moringa fruit peel waste and wood sawdust as a reinforcing material, as well as to test the mechanical and physical properties of the resulting composite board. This study uses an experimental approach in the laboratory with variations in waste composition (15%: 5%: 80%), (20%: 10%: 70%), (25%: 15%: 60%) and a composite board thickness of 1 cm. Testing parameters include tensile tests, compression tests, and water absorption. The tensile test results show that the composition of 15% moringa fruit peel fiber and 5% wood sawdust produces the highest tensile strength of 13.622 Mpa. Compression tests showed that a composition of 20% moringa rind fiber and 10% sawdust produced the highest compressive strength of 25.527 MPa. Water absorption tests showed that a composition of 25% moringa rind fiber and 15% sawdust had the lowest, or optimal, water absorption of 1.8%.
Pemanfaatan Aplikasi Socrative Untuk Meningkatkan Hasil Belajar Pada Materi Hakikat Ilmu Kimia Jayadin, Jayadin; Mahmud, Chusnul Mar’iyah; Malmar, Mutia; Rahman, Safitri; Setiawati, Ayuni; Rahman Coa, Sri Astuti; Leto, Kristina Tresia; Nisa, Kartini Rahman
Entalpi Pendidikan Kimia Vol 7 No 1 (2026)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/epk.v7i1.521

Abstract

Pendidikan adalah suatu usaha untuk mengubah tingkah laku dan sikap seseorang atau kelompok individu dalam melaksanakan pembelajaran dengan tujuan membantu peserta didik menjadi lebih dewasa secara berpikir dan bersikap. Penelitian ini adalah penelitian kuantitatif dengan desain penelitian Pra-Experimen design dan one group pretest posttest design. Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan media aplikasi Socrative terhadap hasil belajar kimia SMAS ST. Petrus Kewapante. Adapun Teknik pengumpulan data yang digunakan dalam penelitian ini adalah tes hasil belajar melalui pretest dan posttest. Instrumen yang digunakan dalam penelitian ini adalah tes hasil belajar. Kemudian untuk Teknik analisis data yang digunakan dalam penelitian ini adalah analisis deskriptif, uji normalitas Shapiro-wilk, Uji Paired sample t-test, dan perhitungan N-gain menggunakan software IBM SPSS statistics 26. Penelitian ini bertujuan untuk mengukur efektivitas perlakuan pembelajaran terhadap peningkatan hasil belajar siswa melalui desain pretest dan posttest. Hasil menunjukan peningkatan rata-rata nilai dari 40.25 menjadi 70.25 dan penurunan standar devisiasi, yang menandakan hasil belajar lebih merata. Uji Shapiro-wilk menunjukan data berdistribusi normal, dan uji paired sample t-test menghasilkan nilai signifikansi 0.000 < 0.05 yang berarti terdapat perbedaan signifikan antara nilai pretest dan posttest. Rata-rata N-Gain sebesar 0.50 termasuk kategori sedang, yang mengindikasikan perlakuan cukup efektif meningkatkan pemahaman siswa
The Implementation of the Snakes and Ladders Game as a Learning Tool to improve Learning Outcomes in the Topic of Reaction Rates Nadila, Nadila; Jayadin, Jayadin; Coa, Sri Astuti Rahman
SEARCH: Science Education Research Journal Vol. 4 No. 2 (2026): April 2026
Publisher : IAIN Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47945/search.v4i2.2816

Abstract

Learning is a process of interaction between teachers, students, and their supporting elements, which are interrelated. However, in practice, students still have a low level of understanding of reaction rates, accompanied by suboptimal learning interest, resulting in less than optimal learning outcomes. One way to address this problem is to utilize engaging and interactive learning media, such as the chemical snakes and ladders game. This media is designed to help students understand the concept of reaction rates in a more enjoyable and meaningful way. This study aimed to determine the effect of using the chemical snakes and ladders game on student learning outcomes in reaction rates. The study was conducted at Waigete 1 State Senior High School using an experimental method with a one-group pretest-posttest design. Data collection was conducted through observation, interviews, and documentation, while data analysis was carried out using SPSS. Analysis techniques included a normality test, an N-Gain test, and a hypothesis test. The results showed a normally distributed data with a significance value of 0.096 for the pretest and 0.184 for the posttest. The N-Gain test obtained a percentage of 53 percent, which is categorized as moderate. Descriptive statistical tests showed that the data were centered around the mean value. The one sample test produced a significance value of 0.001 which is smaller than 0.05 so H1 is accepted.
Co-Authors Farizi, Zakaria Al hikmatiar, hamzarudin Ismiralda, Ismiralda Jayadin Kristina Tresia Leto Mahmud, Chusnul Mar’iyah Malmar, Mutia Mujiburohman, Muhammad Nadila, Nadila Nisa, Kartini Rahman Nurhadyati, Nurhadyati Rahman, Safitri Ridwan, Mastura Setiawati, Ayuni Siti Zuraidah