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All Journal Cannarium (Jurnal Ilmu-ilmu Pertanian) Jurnal Teknologi Terapan Jurnal Kehutanan Papuasia (Journal of Papuasia Forestry) Jurnal Pendidikan MIPA
Rahayu, Yuyu
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Mechanical Engineering Social Sciences

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Physical Behaviour of Wood Plastice Composite Made of Recycled High-Density Polyethylene (HDPE) Rahayu, Yuyu; Setiawan, Wahyu; Endra Gunawan; Susilo Budi Husodo
JURNAL KEHUTANAN PAPUASIA Vol. 9 No. 2 (2023): Jurnal Kehutanan Papuasia
Publisher : Fakultas Kehutanan UNIPA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46703/jurnalpapuasia.Vol9.Iss2.313

Abstract

This paper investigated the physical characteristics of wood–plastic composites, which were made using recycled high-density polyethylene (HDPE) and using wood flour from Pometia sp (Matoa), Intsia sp (Merbau) and Alstonia sp (Pulai) as filler. The sawdust was taken from local furniture industry and the HDPE was collected from recycled plastic bottles of mineral water. Composite panels were made from recycled HDPE through hot-press moulding produced excellent stability based on JIS and SNI Standard, especially for moisture content and swelling characteristics. The water absorption and targeted density were also measured. In this study we found that the water absorption and the density of the composite exceeded our expectation. The composites showed high variation average for water absorption. For the swelling behavior, the value is varied from 5.74% to 25.57% after 2 hours soaking and varied between 7.56% to 28.53% after 24 hours soaking. This study has shown the composites had a high possibility to be used for interior and non-structural purposes.
SIFAT FISIKA PAPAN SEMEN DARI CAMPURAN LIMBAH BATANG SAWIT Nadapdap, Rosmaina Julianti; Rahayu, Yuyu; Husodo, Susilo Budi
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.806

Abstract

This study investigates the physical properties of cement boards made from oil palm trunk waste and evaluates the effect of varying cement-to-palm trunk waste ratios (70:30, 75:25 and 80:20). The independent variable is the cement-to-waste ratio, and the dependent variables include density, moisture content, thickness swelling, and water absorption. Results show that the density of the boards ranges from 0.70 g/cm³ to 1.02 g/cm³, moisture content from 6.79% to 14.49%, thickness swelling after 24 hours of immersion from 17.50% to 70.00%, and water absorption from 40.41% to 68.04%. Ratio 70:30 and 75:25 meet Indonesian National Standard (SNI) criteria for density and moisture content, but thickness swelling exceeds the standard, indicating poor dimensional stability. Increasing cement content improves density and reduces moisture content, but challenges remain in achieving dimensional stability and water resistance. These findings suggest that while oil palm trunk waste can be used in cement board production, further optimization, such as additive incorporation or feedstock modification, is needed to enhance water resistance and stability.
UJI TOKSISITAS EKSTRAK JUNG RAHAB (Baeckea frutescens L.) DAN POTENSINYA SEBAGAI PENGAWET ALAMI KAYU Rahayu, Yuyu; Gunawan, Endra; Alan, Syahrul
Cannarium Vol 22, No 1 (2024)
Publisher : Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/cannarium.v22i1.8247

Abstract

Abstract Termites, which are destructive pests for both plants and wooden structures, pose a significant threat to humans. In Indonesia, termite attacks result in estimated annual economic losses of 1.67 trillion rupiah. To address this issue, effective termite control measures are essential. This study investigates the efficacy of poison extracted from jung rahab (Baeckea frutescens L.) against termites. The research employed an experimental approach with a completely randomized design (CRD), including two treatments and five replications. Concentrations tested were 10%, 15%, and 20%. Results revealed the highest retention value at 0.03494 g for the 10% concentration. However, this value remains below the SNI 01-5010.1-1999 standard. A 10% solution of Jung Rahab leaf extract significantly reduced termite mortality by 98.4%. All concentration treatments led to decreased weight in test samples compared to the control, indicating the inhibitory effect of Jung Rahab leaf extract on termite consumption. Solutions with concentrations of 10%, 15%, and 20% effectively suppressed termite feeding rates. Key words: Termites, extract, retention, mortality Abstrak Rayap merupakan salah satu jenis hama tanaman dan perusak kayu bangunan yang merugikan manusia. Kerugian ekonomis akibat serangan rayap di Indonesia diperkirakan mencapai 1,67 triliun rupiah per tahun. Oleh karena itu, pengendalian rayap menjadi suatu keharusan. Penelitian ini bertujuan untuk menentukan efektivitas racun dari ekstraksi jung rahab (Baeckea frutescens L.) terhadap rayap. Metode penelitian menggunakan desain eksperimental acak lengkap (CRD) dengan 2 perlakuan dan 5 ulangan. Variasi konsentrasi yang digunakan adalah 10%, 15%, dan 20%. Hasil penelitian menunjukkan bahwa nilai retensi tertinggi yang diperoleh adalah 0,03494 gram pada konsentrasi 10%. Namun, nilai retensi ini masih sangat rendah karena belum memenuhi standar SNI 01-5010.1-1999. Pemberian larutan ekstrak daun Jung Rahab (Baeckea frutescens L.) dengan konsentrasi 10% mampu mengurangi mortalitas rayap hingga 98,4%. Seluruh perlakuan konsentrasi mengalami penurunan berat contoh uji dibandingkan dengan kontrol. Hal ini menunjukkan bahwa larutan ekstrak daun Jung Rahab pada contoh uji mampu menghambat kemampuan rayap dalam mengonsumsi contoh uji. Kata Kunci: rayap, ekstrak, retensi, mortalitas
Profile of Students’ Critical Thinking Skills on the Concept of Pressure through Collaborative Sharing and Jumping Task Rahayu, Yuyu; Supriatna, Asep; Riandi, Riandi; Hendayana, Sumar
Jurnal Pendidikan MIPA Vol 23, No 2 (2022): Jurnal Pendidikan MIPA
Publisher : FKIP Universitas Lampung

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

Abstract

This study aims to analyze the profile of critical thinking skills students in science learning with collaborative learning design sharing and jumping tasks. Indicators of critical thinking skills used are based on Ennis (1985). The method used is descriptive qualitative. Lesson design sharing & jumping tasks consist of three core activities: sharing task 1, sharing task 2, and jumping task. The instruments used are observation and audio recording of the learning process. Data were analyzed by Transcript Based Lesson Analysis (TBLA). The results of the analysis show that the collaborative learning design of sharing and jumping tasks can bring up students' critical thinking skills. The profile of students' critical thinking skills in sharing task 1 activities found 6 indicators with the highest percentage at 58%, on sharing task 2 found 12 indicators with the highest percentage at 100%, and jumping task found 9 indicators with the highest percentage at 75%. Keywords: lesson design, critical thinking skills, TBLA, sharing & jumping task. DOI: http://dx.doi.org/10.23960/jpmipa/v23i2.pp701-711
Co-Authors Alan, Syahrul Asep Supriatna, Asep Endra Gunawan Endra Gunawan Mr Sumar Hendayana Nadapdap, Rosmaina Julianti Riandi Riandi Susilo Budi Husodo Wahyu Setiawan