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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

Author-ID : 1228480

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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ANALISIS PENGARUH REAGEN MAX GOLD DAN GRINDING TIME TERHADAP RECOVERY Au Roby Maryudi; Amirin Kusmiran; Rita Desiasni
Hexagon Jurnal Teknik dan Sains Vol 1 No 1 (2020): HEXAGON - Edisi 1
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

PT XX is one of the largest copper companies in the world. There are 2 main minerals spread in PT XX, namely copper (Cu) and Gold (Au). With a processing capacity of 120,000 tons per day, PT XX is able to produce around 2000 tons of concentrate per day. There are several problems in processing, including decreasing the acquisition of grade and recovery of copper and gold because the gold content is still covered in impurities. The sample used is derived from cleaner, namely Polishing mill produck. This study aims to see the effect of grinding time on Au recovery and grade concentrate and see the effect of Max Gold and Pax reagents on recovery of Au and Au grade. The method used is grinding and flotation. The grinding process varies 0, 5 and 10 minutes and flotation using reagents and max gold, based on the results of the study it was found that the smaller the particle size with 10 minutes grinding using the pax reagent the grade and recovery gain increased for grade 6.62 ppm and recovery 84.7%.

PENGARUH VOLUME SERBUK TERHADAP LAJU PENYERAPAN AIR PADA KOMPOSIT PARTIKEL TONGKOL JAGUNG (CORN COB) DENGAN MATRIKS EPOKSI Maulana Malik Ibrahim; Rita Desiasni; Fauzi Widyawati
Hexagon Jurnal Teknik dan Sains Vol 2 No 1 (2021): HEXAGON - Edisi 3
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Serbuk tongkol jagung adalah limbah alam yang digunakan sebagai penguat pada komposit papan partikel. Limbah tongkol jagung sangat berlimpah di Kabupaten Sumbawa Besar, NTB. Pada umumnya tongkol jagung mengandung bahan selulosa murni yang dapat menjadi bahan pengisi alternatif karena sifat seratnya yang kuat (modulus tinggi). Antara rantai-rantai selulosa terdapat ikatan hidrogen yang kuat, sehingga menghasilkan struktur kristalin. Untuk menentukan sifat fisik terhadap limbah tongkol jagung dalam pemanfaatannya. Oleh karena itu limbah tongkol jagung dijadikan sebagai media komposit papan partikel. Serbuk tongkol jagung menggunakan ukuran partikel 70 Mesh dengan variasi volume 30%, 40%, 50%, 60%, 70%. Pembuatan komposit dilakukan dengan metode hand lay up dengan campuran resin epoxy dan hardener menggunakan standar pengujian SNI 03-2105-2006. Hasil yang diperoleh dari uji daya serap air menunjukkan bahwa semakin meningkat variasi volume yang digunakan pada komposit maka semakin tinggi daya serap air pada papan partikel dan semakin lama waktu perendaman yang digunakan makan semakin tinggi persentase yang didapatkan. Sedangkan hasil dari persentase berat terendah yaitu pada variasi volume partikel 30% dengan lama waktu 24 jam sebesar 1.4% dan persentase tertinggi yaitu pada variasi volume partikel 70% dengan lama waktu perendaman yaitu 72 jam sebesar 14.2%. Dari hasil penelitian yang dilakukan menunjukkan bahwa komposit serbuk tongkol jagung dengan resin epoxy pada variasi volume 30% yang lebih baik dibandingkan dengan variasi volume 70%.

Indonesia PENGARUH UKURAN PARTIKELTERHADAP SIFAT FISIK DAN MEKANIK KOMPOSIT LIMBAH GERGAJI KAYU JATI DENGAN MATRIK RESIN EPOXY: PENGARUH UKURAN PARTIKELTERHADAP SIFAT FISIK DAN MEKANIK KOMPOSIT LIMBAH GERGAJI KAYU JATI DENGAN MATRIK RESIN EPOXY rita desiasni; Fauzi Widyawati; Riza Monica
Hexagon Jurnal Teknik dan Sains Vol 3 No 1 (2022): HEXAGON - Edisi 5
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

The physical and mechanical properties of particle composite materials are influenced by particle size. Variations in particle size will form different physical and mechanical properties. The size variations used are 100 mesh, 150 mesh, 200 mesh. The comparison between matrix and particles is 70% : 30% using the hand lay-up method. The test consists of physical tests, namely density and thickness expansion as well as mechanical tests consisting of Modulus Of Rapture (MOR) and Modulus Of Elasticity (MOE). The results of the physical density test were at a value of 0.93-1.02 g/cm3, the best density was at a particle size of 100 mesh with a value of 1.02 g/cm3. While the thickness test obtained values ??ranging from 9.3-9.8%, with the highest thickness development of 9.8% at a particle size of 100 mesh. While the results of the mechanical test itself, all variations in mesh size meet the standard, namely the highest MOR test is obtained in the 100 mesh variation, with a value of 341.15 kgf/cm2, while in the MOE test none of which meets the standards of SNI 03-2105-2006, the highest mesh variation is obtained by mesh. obtained at mesh 100 that is 8072.49 kgf/cm2.

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

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.

Effect of addition of organic inhibitor of kersen leaf extract (Muntingia calabura L) on corrosion rate on A36 steel in seawater media Syamsul Hidayat; Rita Desiasni; Nita Novia
Jurnal Pijar Mipa Vol. 18 No. 4 (2023): July 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i4.5237

Organic inhibitors utilization to reduce corrosion rate on metal has been widely studied because of their environmentally friendly nature. This study aims to calculate the value of the corrosion rate of A36 steel, the efficiency of inhibitors from the extract of Kersen leaf, and determine the corrosion that occurs in the material of A36 steel. The method used is weight loss. The sample was immersed for seven days with inhibitor concentration variations of 0 ppm, 100 ppm, 200 ppm, 300 ppm, 400 ppm, and 500 ppm. The results showed that the extract of Kersen leaf can reduce the corrosion rate. The corrosion rate decreases as the number concentration of the inhibitor is added to the test medium. In contrast, the inhibitor efficiency increases with increasing amounts of inhibitor concentrations added to the test medium. The lowest corrosion rate value and the highest efficiency at adding 500 ppm inhibitor concentration are 0,0767 mmpy and 38,83%, respectively. Based on the results of the microstructure of A36 steel after immersion, pitting corrosion is formed in the form of holes on the steel surface. On steel without inhibitors, corrosion products are more, and the surface is rougher than steel samples added with inhibitors.

Analisis Pengaruh Konsentrasi Natrium Hidroksida terhadap Sifat Mekanik Biokomposit Berpenguat Serat Sisal Kusmiran, Amirin; Desiasni, Rita
Jurnal Fisika Vol 10, No 2 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jf.v10i2.25462

The mechanical properties of natural fibers are continuous development as the alternatively synthetic fibers because of the natural fibers are non-corrosive, lightweight, and environmental advantages. However, these fibers have poor interfacial adhesion properties as the fibers if used as bio-composite material. This problem can be solved by the surface modification method by the sodium hydroxide treatment used to improve the mechanical properties. A sodium hydroxide concentration which it used at 0 wt%, 5 wt%, 10 wt%, and 15 wt% and the sisal fibers were soaked in that a concentration for 2 hours. Furthermore, the bio-composite fabrication is conducted by hand lay-up technique which is using both sisals as the fibers and epoxy resin as the matrix. The tensile test RTG-1250 results show that the maximum mechanical properties, such as strains, Young's modulus, and elongation, was obtained at sodium hydroxide 5 wt% than others where the values of these mechanical properties were 25.334 MPa, 16.111 GPa, and 1.572%, respectively. The morphological evaluation carried out using a scanning electron microscope showed that the alkali sodium hydroxide treatment was improved interfacial adhesion between fiber and matrix. Finally, sodium hydroxide alkali treatment of more than 5% can be able to sisal fiber cracks so that the mechanical properties of bio-composite can decrease continuously.

Preliminary Research for Fault Identification as Disaster Mitigation in Sumbawa Besar Using Geophysics and Geology Methods Hayatuzzahra, Sayidatina; Jayatri, Adella Ulyandana; Desiasni, Rita
Journal of Earth and Marine Technology (JEMT) Vol 4, No 2 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v4i2.5704

Faults are conditions under which rocks are displaced from their original positions. Its presence is closely related to its high tectonic activity. Fault movement can trigger earthquake disasters. Therefore, various studies on faults are important for carrying out disaster mitigation efforts. This study aims to identify the existence of faults in Sumbawa Besar as a disaster mitigation effort. The method used was a combination of geophysical methods and geological field observations. Geophysical methods include the average shear wave method (VS30) and the gravity method. The geological method consists of direct geological observations (geomorphology and structural geology) in the research area. The results of research based on geophysical methods, namely the gravity method, showed that in the research area, there were indications of thrust faults, which were then strengthened by VS30 analysis, which showed the existence of weak zones along the suspected fault lines. The results of field data collection and geological data analysis show that no surface fault characteristics were found in the research area.

PENGARUH FRAKSI VOLUME SERAT SISAL DAN FILLER SERBUK KAYU JATI TERHADAP KEKUATAN TEKAN DAN TARIK PAPAN KOMPOSIT Fitriah Assyurah, Dwi Nurul; Desiasni, Rita; Widyawati, Fauzi
Hexagon Vol 5 No 1 (2024): HEXAGON - Edisi 9
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i1.3147

Semakin meningkatnya permintaan akan bahan material ramah lingkungan untuk mengurangi dampak negatif terhadap kualitas udara global, kesehatan dan iklim global. Beberapa peneliti mulai fokus pada komposit berbasis biokomposit. Komposit dari serat alam dan partikel alam merupakan salah satu alternatif untuk komposit polimer karena keunggulannya dibandingkan dengan serat sintetis. Pada penelitian ini fraksi volume yang digunakan antara serat sisal dan serbuk kayu jati yaitu 5% serat : 15% partikel, 10% serat : 10% partikel, dan 15% serat : 5% partikel dengan volume resin tetap yaitu 80% menggunakan standar ASTM untuk uji bending dan uji tarik. Dari pengujian yang dilakukan, akan didapatkan beberapa data hasil pengujiam, nilai uji bending yaitu MOE teringgi pada variasi 15% serat : 5% partikel dengan nilai 6334,67 MPa dan nilai MOR sebesar 98,21 MPa diikuti dengan hasil terrendah pada variasi 5% serat : 15% partikel dengan nilai MOE sebesar 3987,13 MPa dan nilai MOR sebesar 68,19 MPa. Pada uji tarik didapatkan hasil tertinggi pada variasi 15% serat : 5% partikel dengan nilai nilai tegangan sebesar 71,36 MPa, regangan sebesar 1,61%, dan modulus elastisitas memperoleh nilai sebesar 44,31 GPa, pada variasi 10% serat : 10% partikel diperoleh hasil uji tarik terendah nilai tegangan 50,26 MPa, regangan sebesar 1,34%, dan modulus elastisitas sebesar 37,56 GPa. Hasil dari pengujian menunjukkan bahwa semakin meningkatnya fraksi volume serat membuat kekuakatan mekanik komposit semakin tinggi, penambahan serbuk kayu sebagai campuran filler komposit berfungsi untuk mengisi kekosongan pada pada selah-selah serat dan matriks saat proses pembuatan komposit.

PENGARUH VARIASI VOLUME LIMBAH SERBUK KAYU MAHONI DENGAN PERLAKUAN ALKALI TERHADAP KEKUATAN MEKANIK DAN MIKROSTRUKTUR KOMPOSIT PARTIKEL fatma, fatmawati hendrik; Desiasni, Rita; Widyawati, Fauzi
Hexagon Vol 5 No 1 (2024): HEXAGON - Edisi 9
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i1.3636

Kekuatan sifat mekanik dan fisik material komposit partikel dipengaruhi oleh fraksi volume serbuk dan matriks. Variasi fraksi yang digunakan 30:70%, 50:50%, dan 70:30% dengan metode hand lay up. Perlakuan awal dilakukan dengan perendaman NaOH 2% selama 1 jam. Hasil pengujian mekanik MOE treatment mendapatkan nilai uji tertinggi pada fraksi volume serbuk 30:70% yaitu 6145,51 kgf/cm² dan nilai uji MOR tertinggi pada fraksi volume 30:70% yaitu 167,38 kgf/cm². Sedangkan nilai MOE non-treatment tertinggi pada fraksi volume serbuk 30:70% yaitu 5540,9 kgf/cm² dan nilai uji MOR tertinggi pada fraksi volume 30:70% yaitu 156,6 kgf/cm². Hasil pengujian sifat fisik kerapatan tertinggi pada fraksi volume serbuk treatment 30:70% sebesar 0,87 gr/cm³ dan kerapatan tertinggi pada fraksi volume serbuk non-treatment 30:70% sebesar 0,78 gr/cm³. Hasil uji mekanik MOE tidak memenuhi standar JIS A 5908-2003 sedangkan uji mekanik MOR dan uji fisik telah memenuhi standar JIS A 5908-2003. Hasil pengujian mikrostruktur menunjukkan bahwa pada fraksi volume serbuk treatment 30:70% terlihat partikel lebih kasar yang menyatu sempurna dengan matriks. Sedangkan pada fraksi volume serbuk non- treatment 30:70% terlihat partikel lebih halus dan serbuk dengan matriks seakan tidak merekat dengan baik hal ini karena lapisan lilin yang ada pada serbuk

PENGARUH VARIASI VOLUME LIMBAH SERBUK KAYU MAHONI TERHADAP KEKUATAN FISIK, MEKANIK DAN MIKROSTRUKTUR KOMPOSIT PARTIKEL Desiasni, Rita; Widyawati, Fauzi; Nabila, Maitsa Fikri; Saiful, Muhammad
Hexagon Jurnal Teknik dan Sains Vol 5 No 2 (2024): HEXAGON - Edisi 10
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i2.4143

The strength of the mechanical and physical properties of particle composite materials is influenced by the volume fraction of the powder and matrix. The pretreatment was carried out by soaking 2% NaOH for 1 hour. The results of the MOE treatment mechanical highest test value at the powder volume fraction of 30:70%, which was 6145.51 kgf/cm² and the highest MOR test value at the 30:70% volume fraction, which was 167.38 kgf/cm². Meanwhile, the highest non-treatment MOE value at the 30:70% powder volume fraction was 5540.9 kgf/cm² and the highest MOR test value at the 30:70% volume fraction was 156.6 kgf/cm². The results of the physical properties test were the highest density at the 30:70% powder volume fraction of 0.87 gr/cm³ and the highest density at the 30:70% non-treatment powder volume fraction of 0.78 gr/cm³. The results of the MOE mechanical test do not meet the JIS A 5908-2003 standard while the MOR mechanical test and physical test have met the JIS A 5908- 2003 standard. The results of microstructure testing showed that at a fraction of powder volume of 30:70% it was seen that the particles were coarser which blended perfectly with the matrix.

Co-Authors Ainun Amirin Kusmiran Antoni Arin Komalasari Bahtiar, Syamsul Chandra, Rico fatma, fatmawati hendrik Fauzi Widyawati fifin, handi Fitriah Assyurah, Dwi Nurul Hayatuzzahra, Sayidatina I Putu Widiantara I Putu Widiantara Izzati, Nurul Jayatri, Adella Ulyandana Kallo, Nandhita Suri Kamur, Sudarwin Mardiana Mardiana Maulana Malik Ibrahim Mega Trishuta Pathiassana Melfa Utari Mietra Anggara Muhammad Riski, Muhammad Muhammad, Saiful Nabila, Maitsa Fikri Nita Novia Nofrohu Retongga Nur Azman Nuraga, Welly Nuraga, Welly Handa Puspasari, Fitri Ridwan Tanjung Riza Monica Rizqi Prastowo Roby Maryudi Safitra, Robby Mardian Safitra, Roby Mardiyan Salsabila Sopiandi Sukarsih . Surya Ningsih Syamsul Bahtiar Syamsul Hidayat Syamsul Hidayat Tri Kusmita Triani, Triani Urip Nurwijayanto Prabowo Wafdan Muzakki Yanuar, Emsal Zainurrahman, Muhammad

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