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Yusnimar Sahan
Universitas Riau
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing Public Health Social Sciences Other

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Pemanfaatan Daun Nanas Sebagai Bahan Alternatif Filler Dalam Sintesis Komposit: Dengan Variasi Tebal Komposit Dan Persen Berat Serat Riski Adi Mulia; Idral Amri; Yusnimar Yusnimar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Composite with suitable mechanical properties were needed to meet SNI in the operation of tank in water treatment unit. Some things that can effect it were thick composites and percent weight of fiber. This research aims to make composites with natural fiber fillers from pineapple leaves, acknowledge the optimum tensile strength and flexural strength in composites with variations in composite thickness, and acknowledge the optimum tensile strength and flexural strength in composites with variations in fiber weight. In this research the material used is pineapple fiber with a fiber weight of 15%, 25%, 35%, 45%, with variations of thickness 1; 2 3 4; and 5 mm, used Polyester BQTN 157 as its matrix. Made in press mold, tensile srength tested the standard carried out with ASTM 638-02 and bending standards with the standard reference ASTM D 790-02. Tested was carried out on variations in fiber weight 15%, 25%, 35%, 45%, and variations in composite thickness 1; 2 3 4; and 5 mm . From the tests that have been carried out obtained maximum tensile strength of 63.02 MPa, at 45% by weight of fiber and 5 mm thick, while on bending testing the optimal average on fiber weight was 45% with a thickness of 1 mm which was equal to 445.50 MPa. This result was suitable with SNI for tank operation in the water treatment unit..Keywords : bending strength, tensile strength, polyester, pineapple fiber
Pemisahan Emas Pada Ram (Random Access Memory) Komputer : Pengaruh Variasi Rasio Jumlah Sampel : Volume Pelarut HNO3 Dan Jenis Presipitan Restika Rahayu; Yusnimar Yusnimar; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Gold metal has been using in electronics and telecommunication industry, for example, computer RAM . The separation of gold from the computer's RAM has been done in this study. To get the maximum results in the separation of the gold used variations in the ratio of the number of samples : HNO3 solvent volume ( w/v 1:3 ; 1:6 ; 1:9 ) and the type of precipitant ( NaHSO3 and H2C2O4 ) . In this study, a certain number of samples is used computer RAM with a size of 1-3 mm then it is been leaching with HNO3 at a temperature of 70˚C for 1 hour. The precipitate formed is separated from the filtrate. The precipitate was dissolved in Aqua Regia at a temperature of 70˚C for 30 minutes further diluted with Aqua DM until the volume is 50 mL . Au concentration was analyzed by AAS Atomic Absorption Spectrophotometry and Au deposited with NaHSO3 and H2C2O4 . Based on the analysis result, the maximum Au concentration at the former computer RAM is equal to 54.95 ppm. For 5 grams of the sample , the maximum weight of Au precipitate obtained 0.72 grams by using H2C2O4 as a precipitant .Keyword : Au, RAM computer, Leaching, Precipitant
Pemisahan Emas Pada Video Graphic Array (VGA) Komputer Dengan Metode Elektrolisis Dan Presipitasi Muhammad Nur Rahim Sjam; Yusnimar Yusnimar; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Gold has been using in electronics and telecommunication industry, for example, Video Graphic Array (VGA) computer. To get the maximum results in the separation of the gold used variations potential difference ( 6; 9; 12 volt ) and the type of precipitant (NaHSO3 and H2C2O4) . In this study, 5 gram of samples VGA is electrolyzed by using H2SO4 for 1 hour. The precipitate formed is separated from the filtrate. The precipitate was dissolved in Aqua Regia at a temperature of 70˚C for 30 minutes further diluted with Aqua DM until the volume is 50 mL . Au concentration was analyzed by AAS (Atomic Absorption Spectrophotometry) and Au deposited with NaHSO3 and H2C2O4 . Based on the analysis result, the maximum Au concentration at the former VGA computer is equal to 181,36 ppm. For 5 grams of the sample , the maximum weight of Au precipitate obtained 1,07 grams by using NaHSO3 as a precipitant .Keywords : Au, VGA computer, Electrolysis, Precipitant
Sintesis Kitosan Dari Limbah Cangkang Kepiting Dengan Variasi Suhu Dan Waktu Pada Proses Deasetilasi Rusma Yanti; Drastinawati Drastinawati; Yusnimar Yusnimar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Chitosan is a biopolymer produced from the chitin deacetylation process that is widely present in the outer skin of crustacean animals such as shrimp and crabs. This study aims to determine the effect of temperature and reaction time on the deacetylation process and chitosan characterization analysis (yield, moisture content, ash content, and deacetylation degree). Crab shell crab with size of 100 mesh. The chitin found in the crab shell powder was isolated by deproteinization and demineralization processes. The resulting chitin is then transformed into chitosan by deacetylation process under operating conditions at 100 °C, 110 °C and 120 °C, 50% NaOH concentration, chitin mass ratio and NaOH volume 1:20 (b / v), stirring rate 150 rpm, and reaction time of 1 hour, 2 hours and 3 hours. The results showed that the higher the temperature and the duration of reaction time caused an increase in the degree of deacetylation and a decrease in yield and ash content, while the water content had no effect. Chitosan obtained has a yield of 38.14 - 60.36%, moisture content of 1.78 - 3.57%, ash content 0.75-1.75% and deacetylation degree 72,47 – 86,75%.Keywords: biopolymer, chitin, chitosan, deacetylation, deacetylation degree
Pemisahan Emas Pada PC Mainboard Komputer : Pengaruh Rasio Sampel : HNO3 Dan Jenis Presipitan Esti Rahmat Tini; Yusnimar Yusnimar; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Gold (Au) has been used widely in the electronics and telecommunications industries. In the Printed Circuit (PC mainboard, the former metal there are approximately 80-1000 ppm Au. In this study Au has been separated from PC Mainboard with treatment variation ratio of the amount of samples and HNO3 (1: 3; 1: 6; and 1: 9 w/v) and the type of precipitants (NaHSO3 and H2C2O4). Gold content was determined by Atomic Absorption Spectrophotometry. For 5 grams PC mainboard sample with a size of 1-10 mm was leaching with HNO 3 at T=70°C for 1 hour, the precipitate formed is separated from the filtrate. Then, the precipitate obtained was leaching with aqua regia at T=70°C for 30 minutes, the precipitate dissolved and further it diluted with aqua DM until it is volume 50 mL. Later, concentration Au is analyzed by AAS and Au are deposited using a precipitant H2C2O4 and NaHSO3. According to the result, content of Au in the PC mainboard is 300 ppm. For 5 grams amount of sample is obtained maximum weight of 2.14 grams Au deposition using H2C2O4 as a precipitant.Keywords: Au, leaching, PC Mainboard, precipitant.
Pemanfaatan Limbahdaun Nanas Sebagai Bahan Alternatiffiller Dalampembuatan Komposit : Dengan Variasi Posisi Serat Dan Jumlah Lapisan Serat Reza Andreano D; Idral Amri; Yusnimar Yusnimar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

At the moment composite is one of the alternative materials being developed and widely used in the industrial world. Composites that use natural fibers are chosen because they are also environmentally friendly besides cheap. One of the natural fibers around us and has good potential is pineapple leaf fibers. This study aims to determine the effect of the number of fiber layers and position of pineapple leaf fibers on the mechanical properties of composites where the resin used in this study is polyesther resin. In this study an analysis of the composite strength, elasticity and elasticity was carried out. This study uses pineapple leaf fibers with variations of 1 layer of fiber, 2 layers of fiber, 3 layers of fiber and variations in the position of the fibers, namely below, in the middle, above. The results showed that the highest mechanical properties were obtained by composites with 3 layers of fiber with tensile strength values of 65.09 MPa, flexural strength of 327.1 MPa and elastic modulus of 5917.3 MPa. The resulting composite has met fiberglass reinforced plastic specification standards for water treatment units based on SNI 7504:2011. Keywords: composite, fiber, pineapple leaves, polyesther
KONVERSI TEPUNG SAGU MENJADI SIRUP GLUKOSA DENGAN MENGGUNAKAN KATALIS ASAM KLORIDAv Edi Sutanto; Yusnimar Sahan; Deby Octavia
Jurnal Sagu Vol 13, No 1 (2014)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (213.935 KB) | DOI: 10.31258/sagu.v13i1.2132

Abstract

Sago is one of carbohydrates potential resource for foods and raw materials in industries. Sago can beconverted to a glucose syrup by using HCl 0,5N as a catalyst. The purpose of this research is make glucosesyrup with the process of hydrolysis of sago flour and determining the influence of temperature, volume theaddition of acid and hydrolysis time on reducing sugar concentration of syrup produced. In order to get thehighest of glucose concentration in these syrup, in this research sago hydrolysis process have been doneunder variation of the volume acid (10, 15 and 20 ml), the hydrolysis temperatures (105, 115 and 125 o C) andthe hydrolysis time (15, 30 and 45 minutes). The glucose syrup were analyzed, such as water content by SNI08-7070-2005 and glucose content by the Nelson-Somogyi method. Based on the result, the highest ofglucose content in this syrup is 67.7% under condition the addition of 0.5 N HCl volume by 15 ml, hydrolysistime 30 minutes and temperature of 125 o C. The resulting glucose syrup meets the standard based on SNI 01-2978-1992 namely glucose concentration of more than 30% and a water content of less than 20%.Key words: glucose, glucose syrup, hydrolysis, HCl, sago starch
Synthesis and Characterization of Hydroxyapatite from Duck Eggshell by Wet Precipitation Process Yelmida Azis; Cory Dian Alfarisi; Komalasari Komalasari; Khairat Khairat; Yusnimar Sahan
Journal of Applied Materials and Technology Vol. 3 No. 1 (2021): September 2021
Publisher : AMTS and Faculty of Engineering - Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/Jamt.3.1.8-11

Abstract

Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is the most stable form of calcium phosphate and widely used in various medical applications, mainly in orthopedics and dentistry due to its close similarities with the inorganic mineral component of bone and teeth. This study aims to synthesize hydroxyapatite from duck eggshell using the precipitation method. The duck eggshell was calcined, hydrated (slaking) and underwent carbonation to form Precipitated Calcium Carbonate (PCC).  Afterwards, (NH4)2HPO4 was added to produce HAp by varying the molar ratio of Ca/P by 1.67, 1.77 and 1.87 and stirring speed by 200, 250, 300rpm under basic condition (pH 10 – 11). The best results were obtained at a molar ratio of 1.77 with 200rpm stirring speed. Furthermore, the X-ray Diffraction (XRD) analysis showed that its crystals were hexagonal with sizes of 23.062nm, in the absence of other crystalline phases. Therefore, the hydroxyapatite was obtained in the agglomerates form with a specific surface area of ??55.929m2/g.
Produksi Biodiesel Dari Minyak Nyamplung Dengan Katalis Ni/Lempung Taufik Kharnofa; Syaiful Bahri; Yusnimar Yusnimar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The research has been done to produce biodiesel from calophyllum inophyllum oil with Ni/clay catalyst. Several variations of the process variables were done to assess its influence on acquisition (yield) of biodiesel and quality of biodiesel produced. The variables are used consist of a dependent variable and independent variable. Dependent variables are calophyllum inophyllum oil weight 50 grams, the catalyst concentration Ni / clay 0.5%-b oil, reaction temperature of 60 °C and a reaction time of 90 minutes, while the independent variable which variation mole ratio of oil : methanol 1: 6, 1: 9 and variations of Ni metal impregnation 0% -w (no metal) 1%-w, 2%-w and 3%-w samples of clay. This research has given result the highest yield of 95.36% biodiesel obtained in the use of Ni(3%)/clay catalyst and the mole ratio of oil : methanol of 1: 9. The biodiesel produced has a density of 883 kg/m3, kinematic viscosity of 4,46 mm2/s, acid number of 0.50 mg KOH / g sample and the flash point of 155°C respectively.Keywords: Biodiesel, Ni/Clay Catalyst, Calophyllum Inophyllum Oil
Pembuatan Biodiesel Dari Minyak Biji Bintaro Dengan Reaksi Transesterifikasi Dan Katalis Lempung Ratna Dian Armalita; Syaiful Bahri; Yusnimar Yusnimar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Biodiesel is one of the alternative energy made from the transesterification reaction between vegetable oils and methanol. One potential source of vegetable oil to be developed in Indonesia is bintaro seed oil. Plant bintaro as a non-food crop so it will not compete with food needs as well as cultivated plants are now widely used as an ornamental plant reforestation and on the edge of the highway. This study aims to create crude biodiesel from oil of the seeds bintaro. In this study the effect of amount of clay catalyst (0.5%, 1%, 1.5%) and effect of the mole ratio of methanol-oil (3: 1, 6: 1 , 9: 1) are studied in biodiesel produced and determined the characteristics of biodiesel from oil seeds bintaro. The study begins from raw material preparation which includes drying and grinding. Furthermore, bintaro seed oil is extracted and followed by degumming to remove impurities contained in the oil. Acquisition of the highest of crude biodiesel yield obtained by 91.70% in conditions reactan is ratio of 9 : 1 and amount of catalyst 0.5%. Results characteristics of crude biodiesel such as density 40oC of 890 kg/m3, 4.7 cSt viscosity kinematic 40oC, acid number of 0.59 mg-KOH/g. Based on analysis of GC-MS (Gas Chromatography-Mass Spectromatry) shows that the composition of crude biodiesel are methyl Oleat bintaro 53.92%, 25.91% methyl palmitate and methyl linoleic 20.16%.Keyword : biodiesel, clay, bintaro seed oil
Co-Authors , Deviona, , Ahmad Fadli Aisyah Rani Alfarisi, Cory Dian Alhabsy Affif Aman, Azka Amun Amri Andi Muhammad s, Andi Muhammad Annisa Ulhasanah Apriliani, Prapita Aqilla Cahyani Ardiansyah, M. Frendy Armaini, Armaini Arofi, Habib Barata Aditya Prawiranegara Bhaskoro A. Muthohar Chairul Chairul Chairul Chairul, Chairul Darliansyah, Danny Darmiyati, Siti Deby Octavia Deni Afrika Desadria, Renny Desi Heltina Dian Agustin Drastinawati Drastinawati Drastinawati Drastinawati, Drastinawati E, Sutanto E, Yenie Edi Sutanto Edo Prima Arif Edwidya Ocktaviani Armay Eliza, Mutia Emelda, Retta Esti Rahmat Tini Evelyn Evelyn Evelyn EVELYN EVELYN Fadli, Deno Febri Feni Nopriza Fermi, Iwan Fitri Zulva Hasanah Hamsyah Adhari Hasby Herdinasrul Hasibuan, Muhammad Ilham Febrian Mahodum Heliyanti, Sri Heni Sugesti Idral Amri Indrawati . Indriana, Hanifah Intan Fitra Martin, Intan Fitra Irwanda, Juni Isnaini Isnaini J. N. Rahman Juliani Dafis Kamarullah, Rahmat Khafid Ali Mahdi, Khafid Ali Khairat Khairat, Khairat Khamaluddin Aditya Kiki Despramita Komalasari Komalasari Komalasari Komalasari Komalasari Komalasari M. Iwan Fermi Maria Peratenta Sembiring Mashuri Mashuri Mhd Taufik Kurniawan Misrulina Misrulina Muhammad Amri Muhammad Ismet Muhammad Nur Rahim Sjam muhammad rizky, muhammad Mukhlisoh Arifah Mulyadi . Nurul Azizah Nurwijayanti Ohi, Hiroshi P. Ningendah Pebriansyah Putra Putri, Alivia Hardana Quentena, Novi Rahmadahana, Suci Rahmi Adisti Rahmi, Sri Wahdini Ramadona, Aulia Ratna Dian Armalita Restika Rahayu Reza Andreano D Ricson Rinaldi Riski Adi Mulia Rispiandi, Fadli Rizaldi Saputra Rozzana Sri Irianty Run Bunga Dewi Rusma Yanti S, Muhammad Rizki Sasmitra, Dani Sayyidhani, Muhammad Hisna Sherly Fitri Rahmadhani Silvia Reni Yenti siti rahmah Sri Helianty Sri Herlianty Sukiman Hernanda Surya Romadani SYAIFUL BAHRI Syamsu Herman Syelvia Putri Utami Tasman, Annaya Qamara Taufik Kharnofa Utama, Panca Setia Wahyu Rahmadhan Wisrayetti Wisrayetti Wulandari, Siti Rahmi Indri Yelmida Azis Yulfiana Sultana Yulva Gemy Yusra, Arif Zultiniar Zultiniar