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All Journal JURNAL FISIKA Turbo : Jurnal Program Studi Teknik Mesin Jurnal Rekayasa Material, Manufaktur & Energi Jurnal Pengabdian Magister Pendidikan IPA Jurnal TAMBORA KURVATEK Journal of Earth and Marine Technology (JEMT) Bima Abdi: Jurnal Pengabdian Masyarakat Jurnal Pijar MIPA Society : Jurnal Jurusan Tadris IPS Jurnal Riset Fisika Indonesia Hexagon ARembeN
Rita Desiasni
Universitas Teknologi Sumbawa
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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Journal : Jurnal TAMBORA

 1 
ANALISIS PENGARUH VARIASI DOSIS REAGENT MODIFIER RA666 TERHADAP % RECOVERY Cu, Au dan CuASN Desiasni, Rita; Sopiandi; Kusmiran, Amirin
Jurnal TAMBORA Vol 3 No 2 (2019): EDISI 7
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (976.331 KB) | DOI: 10.36761/jt.v3i2.351

Abstract

PT. AMNT adalah salah satu tambang yang mengolah biji tembaga konsenterat. Strategi PT AMNT dalam menangani biji tambang untuk diproduksi dalam jangka panjang yaitu dengan membuat stockpile. Kondisi ore stockpile saat ini mengalami kontak antar oksigen yang terdapat di udara terbuka dengan timbunan biji tembaga sulfida menjadi sulfida-oxida (atou sulfida teroksidasi) yang umum terjadi peremukan partikel biji. Pengolahan biji yang telah mengalami oksidasi akan menyebabkan penurunan % recovery Cu, Au dan CuASN sehingga dalam penelitian ini mencoba menganalisis perbandingan selektivitas reagent modifier yang digunakan saat ini yaitu NaSH dengan metode As Plant Es -500 dengan pengaruh variasi dosis reagent modifier baru yaitu RA666  dengan penambahan dosis 50 g/t, 100 g/t dan 300 g/t sebagai pembanding dengan pengunaan NaSH. Pada penelitian ini didapatkan % recovery Cu, Au dan CuASN paling tinggi pada variasi dosis RA666 100 g/t dibandingkan dengan penggunaan NaSH menahan Es -500 dan variasi dosis RA666 lainnya dan perolehan terendah pada variasi dosis RA666 50 g/t dibandingkan dengan penggunaan NaSH menahan Es -500 dan variasi dosis lainnya. Ini menunjukan penggunaan dosis untuk penggunaan regen RA666 yang baik pada dosis 100 g/t.
PENGARUH ORIENTASI SERAT KOMPOSIT E-GLASS EPOXY TERHADAP SIFAT MEKANIK PEGAS DAUN TUNGGAL DENGAN METODE ELEMEN HINGGA Kusmiran, Amirin; Desiasni, Rita
Jurnal TAMBORA Vol. 4 No. 1 (2020): EDISI 9
Publisher : Wakil Rektor 3, Direktorat Pengabdian kepada Masyarakat dan Publikasi, Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1095.811 KB) | DOI: 10.36761/jt.v4i1.574

Abstract

Single leaf spring is one of the suspension systems on vehicles that function as vibration dampers which usually use steel. One type of steel that is often used in making single leaf springs is 55Si7 steel. However, at this time composite materials began to be used as an alternative material to replace steel. One of the composite materials used as a substitute for steel is E-glass epoxy. This study aims to determine differences in the characteristics of steel leaf springs and e-glass epoxy composites. In addition, the effect of orientation of the fiber direction to deformation, stress, and safety factors on leaf springs was also carried out in this study. The analytical method used is finite element. The results showed that the composite leaf springs had lower stress than steel leaf springs. E-glass epoxy composite leaf springs variation D (fiber orientation 45º / -45º) showed the lowest stress and highest safety factor with values ??of 596 MPa and 1.4 respectively.
PENGARUH VOLUME LIMBAH SERBUK KAYU JATI (TECTONA GRANDIS) TERHADAP DAYA SERAP AIR PADA KOMPOSIT PARTIKEL DENGAN MATRIKS EPOKSI Desiasni, Rita; Chandra, Rico; Widyawati, Fauzi
Jurnal TAMBORA Vol. 5 No. 2 (2021): EDISI 13
Publisher : Wakil Rektor 3, Direktorat Pengabdian kepada Masyarakat dan Publikasi, Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/jt.v5i2.1128

Abstract

The furniture industry is a company that utilizes forest products in the form of wood as the main raw material in the production process. The wood used by the furniture industry in Indonesia reaches 2.6 million m3 per year. The waste generated reached 54.24% of the total production. Sawmill waste generated as much as 1.4 million m3 per year. Based on field observations in several furniture industries in the Sumbawa Region, most industries produce sawdust waste that has not been used optimally, so that sawdust waste accumulates in the soil and decomposes which can trigger environmental pollution and water pollution. Teak sawdust waste has a high cellulose content so it plays an important role as a reinforcement raw material in the manufacture of particle composites. In this study using the hand lay up method of making composite particles by utilizing waste teak sawdust as raw material for reinforcement and epoxy matrix with volume variations of 30:70%, 40:60%, 50:50%, 60:40%, 70:30. %, to obtain quality composite characteristics. Water absorption obtained 14%, each composite specimen has met the standard of SNI 03-2105-2006. The results of physical tests on the water absorption of particleboard composites were the lowest at 0.48% at 30% powder volume with 24 hours immersion due to the wood powder being mixed and bonded evenly by the matrix so as to reduce voids, while the highest yield was 9.41% in 70% volume is due to the matrix not being able to bind evenly, causing voids to occur. It can be concluded that the increasing volume of powder and the length of time of immersion, the greater the percentage value of water absorption produced.
SIFAT FISIK DAN MEKANIK KOMPOSIT PAPAN PARTIKEL BERDASARKAN VARIASI UKURAN SERBUK KAYU MAHONI (SWIETENIA MACROPHYLLA) SEBAGAI MATERIAL ALTERNATIF : PAPAN KOMPOSIT Rita Desiasni; Nur Azman; Fauzi Widyawati
Jurnal TAMBORA Vol. 7 No. 2 (2023): EDISI 19
Publisher : Wakil Rektor 3, Direktorat Riset, Publikasi dan Inovasi, Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/jt.v7i2.2714

Abstract

Sifat fisik dan mekanik material papan komposit dipengaruhi oleh ukuran partikel. Variasi ukuran partikel akan membentuk sifat fisik dan mekanik yang berbeda. Variasi ukuran yang digunakan yaitu 20 mesh, 40 mesh, 60 mesh dan 80 mesh. Perbandingan matrix dan partikel yaitu 70% : 30 % menggunakan metode hand lay-up. Pengujiannya terdiri dari uji fisik yaitu kerapatan dan pengujian mekanik yang terdiri dari Modulus of Rupture (MOR) dan Modulus of Elasticity (MOE). Hasil pengujian fisik kerapatan berada pada nilai 0.76 gr/????????3 – 0.84 gr/????????3, kerapatan terbaik pada ukuran partikel 80 mesh dengan nilai 0.84 gr/????????3. Secara keseluruhan kerapatan papan komposit pada semua sampel memenuhi standar JIS A 5908 (2003) rentang nilai kerapatan 0.4 gr/????????3 – 0.9 gr/????????3. Sedangkan Modulus of Rupture MOR tertinggi terdapat pada variasi 80 mesh dengan nilai 29.1 MPa dan hasil terendah pada uji Modulus of Rupture (MOR) papan komposit pada 20 mesh dengan nilai 8.4 MPa. Hasil MOR Papan komposit memenuhi Standar JIS A 5908 (2003) dengan standar minimal 7.8 MPa. Sedangkan untuk nilai MOE menunjukkan hasil Modulus of Elasticity (MOE) maksimal pada 60 mesh yakni 1155.9 MPa. Namun hasil pengujian MOE belum memenuhi standar JIS A 5908 (2003) yang memiliki standar minimal papan komposit sebesar 1961 MPa.
Co-Authors Ainun Amirin Kusmiran Antoni Arin Komalasari Bahtiar, Syamsul Chandra, Rico Dwi Nurul Fitriah Assyurah fatmawati hendrik fatma Fauzi Widyawati fifin, handi Hayatuzzahra, Sayidatina I Putu Widiantara I Putu Widiantara Izzati, Nurul Jayatri, Adella Ulyandana Kamur, Sudarwin Mardiana Mardiana Maulana Malik Ibrahim Mega Trishuta Pathiassana Melfa Utari Mietra Anggara Muhammad Riski, Muhammad Muhammad, Saiful Nabila, Maitsa Fikri Nandhita Suri Kallo Nita Novia Nofrohu Retongga Nur Azman Nuraga, Welly Handa Puspasari, Fitri Ridwan Tanjung Riza Monica Rizqi Prastowo Robby Mardian Safitra Roby Mardiyan Safitra Roby Maryudi Safitra, Roby Mardiyan Salsabila Sayidatina Hayatuzzahra Sopiandi Sukarsih . Surya Ningsih Syamsul Bahtiar Syamsul Hidayat Syamsul Hidayat Tri Kusmita Triani, Triani Urip Nurwijayanto Prabowo Wafdan Muzakki Welly Handa Nuraga Welly Nuraga Yanuar, Emsal Zainurrahman, Muhammad