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Manik, Tetti Novalina
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Journal : Jurnal Natural Scientiae

 1 
Studi Alkalisasi Serat Tandan Kosong Kelapa Sawit Sebagai Penguat Komposit Material Akustik. Meilina, Putri; Haryanti, Ninis Hadi; Manik, Tetti Novalina
Jurnal Natural Scientiae Vol 4, No 1 (2024): Mei 2024
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jns.v4i1.12565

Abstract

The use of empty oil palm fruit bunches as reinforcement in making composite boards has been carried out. Palm oil empty bunch fiber was obtained in the Kotabaru area, South Kalimantan. Palm oil empty fruit bunch fiber is hydrophilic which causes low adhesive properties between the fiber and the matrix so it is necessary to alkalize with 3% NaOH for 5 hours first. Alkalization has increased the cellulose content by 19.36% and reduced the lignin component by 9.04% and other components, such as hemicellulose, pectin, fat and others by 59.63%. Making composite boards uses the hand lay-up method and has succeeded in improving physical and mechanical properties. Water content according to SNI. The acoustic performance of composite boards shows significant results. The acoustic properties of composite boards without alkalization are sound absorbing, while with alkalization they are reflective. These results are supported by FTIR and SEM morphology results, which show that the interfacial bonding properties between the fiber and the matrix increase, thereby changing the acoustic performance of the TKKS composite board.Keywords:  Alkalization, hand lay-up, acoustic performance, absorption, reflection.
Interpretasi Struktur Bawah Permukaan Menggunakan Metode Magnetik di Sekitar Gedung Auditorium ULM Banjarbaru, Kalimantan Selatan Safitri, Normala; Siregar, Simon Sadok; Sudarningsih, Sudarningsih; Manik, Tetti Novalina
Jurnal Natural Scientiae Vol 5, No 2 (2025)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jns.v5i2.17485

Abstract

Subsurface interpretation research has been carried out using the magnetic method with the aim of knowing the value of magnetic anomalies and subsurface rock structures around the ULM Banjarbaru Auditorium Building.In this study, data was collected using the PPM G-856 tool, which performed up to 55 measurements with a 5 m spacing between points.  According to the research findings, the magnetic field anomaly values in the study area range -1252.2 nT – 1725.4 nT. The 2D modeling results show that the study area is the Dahor formation, which consists of claystone,siltstone, and rock sand. The results of measuring the susceptibility value of each rock are 0.01; 0.015 and 0.018 SI for claystone,  0.001 and 0.0011 SI for siltstone, and 0.02 SI for rock sand.
Co-Authors Akbar, Arief Rahmad Maulana Anny Sulaswatty, Anny Az Zahra, Aisyah Nur Budi Kristanto Darminto . Dewi Sri Susanti Egi Agustian Erdiansyah Rezamela, Erdiansyah Gusti Atika Urfa Hafiizh Prasetia, Hafiizh Hendris Hendarsyah Kurniawan, Hendris Hendarsyah Hindarto, Imam Ibrahim Ibrahim Ida Ayu Putu Sri Widnyani Iwan Yahya Khayanti, Yuni Sri Krisdianto Sugiyanto Mashuri Mashuri Meilina, Putri Muhammad Zainuri Nasrulloh, Amar Vijai Ninis Hadi Haryanti, Ninis Hadi Nova Annisa, Nova Oni Soesanto Purba, Santi Carolina Rahmat Eko Sanjaya Rahmat Yunus Ramadhoni, Benni F Rasjava, Achmad Ramadhanna'il Safitri, Normala Santoso, Tanto Budi Sembiring, Rinawati Shaliha, Shaliha Simon Sadok Siregar, Simon Sadok Sri Cahyo Wahyono Suarso, Eka Sudarningsih Sudarningsih Sudarningsih, Rusdiansyah Suryajaya Suryajaya, Suryajaya Susilo, Tanto Budi Sutomo Sutomo Thresye Thresye Thresye,, Thresye, Totok Wianto Yuyun Hidayat