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All Journal ISTORIA INFORMASI Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Harmoni Sosial: Jurnal Pendidikan IPS Diakronika Jantra Journal of Social Studies (JSS) Unri Conference Series: Community Engagement Media Didaktika
Aman aman
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Journal : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

 1 
Pengaruh Parameter Rasio Liquid-Solid, Suhu Dan Lama Perawatan Terhadap Kuat Tekan Paving Blok Geopolimer Thomson Simanjuntak; Aman Aman; Ahmad Fadli
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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Fly ash as a substitute for cement shows potential waste utilization. The objective of the research is to find the optimum parameter to produce geopolymer. Use of fly ash type F from Paiton Probolingo power plant, fine aggregate of sand,NaOH 14M and Na2SiO3 solution. The liquid activator/solid (fly ash) ratio varies 0.3; 0.5 and 0.7 and treatment temperature variations from room temperature (30), 60, 80 and 100 oC and curing time of 3, 7, 14 and 28 days. The modulus activator ratio of Na2SiO3 / NaOH is 2 and the ratio of fly ash to aggregate is 1: 3. Compressive strength obtained 314.20 kg/cm2 at optimum ratio of liquid/solid 0.5 and curing at 80 oC and 28 days.Keywords: Fly ash; Geopolymer; Paving block; Compressive Strength; Modulus.
Pengaruh Jumlah Penambahan Graphene Nanosheets (GNSs) Dan Gliserol Terhadap Sifat Mekanis Coating Komposit Berbasis Polyvinyl Alcohol (PVA) Abdul Rasyid Amrin; Amun Amri; Aman Aman
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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Polyvinyl alcohol (PVA) based conductive coatings composite wih the addition of graphene nanosheets (GNSs) have been successfully synthesized. Composites were synthesized using the solution mixing method and were tested their conductive properties, mechanical properties (tensile strength, elongation at break, and young modulus), morphology, and functional group analysis. The results showed that the addition of graphene increased the electrical conductivity, tensile strength, and Young modulus, but decreased elongation at break composite coating. Addition of glycerol increased elongation at break, but decreased the electrical conductivity, tensile strength, and Young modulus. The highest electrical conductivity was 1.11 x 10-3 s/m obtained by adding 3% graphene, the highest tensile strength was 25,894 MPa obtained by adding 3% graphene, the highest elongation was 250.862% obtained by adding 2%wt glycerol, and the highest modulus young was 18,496 MPa obtained by adding 3% graphene. Based on the results of the study, the PVA-based conductive composite coating with the addition of graphene nanosheets has a good perspective to develop further. Keywords: coating composite, glycerol, graphene, PVA
Pengaruh Suhu Sintering Pada Pembuatan Prototipe Replika Tulang Berbasis Hidroksiapatit Dengan Metode Starch Consolidation Adi Mulyadi Putra; Aman Aman; Ahmad Fadli
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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3D bone replica based on porous Hydroxyapatite (HA) is a candidate bone implant material that has similarities to the original bone. Starch consolidation is one of the methods for making HA scaffold The purpose of this research are to determine the effect of sintering temperature on porous HA characteristics. This research was conducted by mixing 20 grams of HA with 8 grams of sago starch and 25 ml of distilled water to form slurry. The slurry formed was then stirred at 400 rpm. The mixture was then put into a mold. Then the mixture in the mold was heated to 100oC for 60 minutes. After that, the green bodies are removed from the mould and dried in an oven at 80°C for 24 hours and 110°C for 8 hours. The dried sample is then put into the furnace. Combustion is carried out at a temperature of 600˚C and ended with sintering at a temperature of 1250˚C with the increasing rate of sintering temperature at 2°C/minute and holding time for 1 hour. The higher the sintering temperature causing the density, shrinkage and bending stress to be greather. Sintered bodies show density in the range of 2.52-2,56 gr/cm3, shrinkage 35.87–39.47% and bending stress 4,026.49 MPa. Keywords: bending stress; bone replica; hydroxypatite; sintering
Pembuatan Geopolimer Ringan Berbasis Fly Ash Batubara Dengan Penambahan Styrofoam Nurwulandari Saputri; Amun Amri; Aman Aman
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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This study aims to make coal fly ash based light geopolymers with the addition of styrofoam as a lightweight aggregate. The light geopolymers was prepared by mixing the coal fly ash and high concentration of alkaline activator solution, with styrofoam. The mixture was then molded and formed to the geopolymers mortar and cured at temperature of 25℃ for 28 days. The results indicated that the addition of styrofoam decreased the compressive strength and density of geopolymer mortar. The highest compressive strength was obtained from sample with the addition of 1.5% -wt styrofoam and the size of 1 > x ≤ 5 mm styrofoam, which 8.8 MPa. The mechanical properties of geopolymer mortar were affected by the amount of styrofoam added and the size distribution of styrofoam in the geopolymer matrix. Keywords : alkali activators, geopolymer, styrofoam
Pengaruh Penambahan Grafena Dan Waktu Kalsinasi Terhadap Karakteristik Batu Bata Puji Rahmawati Dwi Sukma; Amun Amri; Aman Aman
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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This study aims to produce bricks with the addition of few layers graphene (FLG) and to study the effects of graphene addition and calcination time to the characteristics of the bricks produced. The brick-graphene composites synthesis was started from the manufacture of FLG using the turbulence-assisted shear exfoliation (TASE) method. The graphene was then added to the prepared clay, and formed size 5x5x5 cm3 and dried at room temperature for a week. Then the bricks were calcined with variations of 1-5 hours, and the addition of graphene 5-15%wt in furnace at temperature of 800ºC. The mechanical properties of bricks were obtained from compressive strength and porosity tests. With the addition of graphene and the length of time calcination increased the compressive strength and decreases the porosity in bricks. The results showed that the highest compressive strength (6 MPa) was exhibited by sample with the addition of 15% wt graphene and 5 hours calcination time. The lowest porosity (8%) was showed by sample with the addition of 15% wt graphene and 5-hours calcination time. The structure and morphology of graphene were characterized with the fourier transform infrared spectrophotometer (FTIR) and scanning electron microscopy (SEM), while the crystal size of graphene was probed using the diffraction x-ray (X-RD). The XRD test showed the crystal size FLG of 25.5nm, while the SEM results show that graphene was evenly diffused.Keywords : additives, graphene, clay, compressive strength, porosity
Pirolisis Biomassa Pelepah Sawit Menjadi Bio - Oil Dengan Katalis Natural Zeolit Dealuminated (NZA) Rajib Azri; Syaiful Bahri; Aman Aman
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Petroleum as a primary energy source at this time, increasingly limited supply. Beside the population growth will lead to the increasing need for petroleum. To overcome these problems needed alternative energy sources that can be updated is one of the bio-oil. Bio-oil produced by pyrolysis process using biomass with warming, in the absence of oxygen. The purpose of this study was to determine the effect of variations in the catalyst on the yield of bio-oil produced, knowing the value of density, viscosity, acid number and flash point of bio-oil as well as knowing the chemical components of the bio-oil by GC-MS method. Pyrolysis uses palm frond as much as 50 grams along with 500 ml silinap with NZA catalysts variation of 0%, 1%, 2%, 3%, and 4% w / w with a stirring speed of 300 rpm and a temperature of 320 º C for 120 minutes. In this penelitiam largest yield obtained on the catalyst NZA 3% variation of 44.4%. Characteristics of physical properties obtained are: density of 0.996 g / ml, 11.733 cSt viscosity, acid number 79.34 g NaOH / g sample, as well as the flash point 58 º C. The results of GC-MS analysis, the dominant chemical components in bio-oil are acetic acid (40.90%); methanol (9.60%); methyl ester (2.30%); phenol (32.88%); 2-furancarboxaldehyde (8.98%).Keywords : Bio-oil, Pyrolysis, NZA, Palm Frond
Konversi Termal kayu ketapang (Terminalia Catappal) Menjadi Bio-Oil Dengan Teknologi Pirolisis Menggunakan Katalis NiMo/NZA Ari Aditia Sukma; Syaiful Bahri; Aman Aman
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Availability of fossil fuels are depleting resulted in higher mining costs and selling prices to the public. In addition, the results of its combustion also releases GHG to the environment. One way to reduce the use of fossil fuels is produce bio-oil through pyrolysis technology. Ketapang rod is a huge potential used as feedstock for bio-oil production because its high cellulose content (41.80%). Synthesis of bio-oil from Ketapang stem begins with the process of size reduction of biomass and natural zeolite to -100+200 mesh size. Then, into the natural zeolite impregnated Ni and Mo to form the bimetallic catalyst NiMo/NZA. The catalyst is then activated through the stages of calcination, oxidation, and reduction. Pyrolysis process is done by varying the weight percentage of catalyst to biomass, ie: 1.5%, 2%, 2.5%, and 3% w/w. In addition, the catalytic pyrolysis process is carried 3% NZA only  and 3% NiMo/NZA were activated by calcination process alone. The highest yield was obtained on the use of catalysts NiMo/NZA perfect activated which amounted to 91.05%. From physics analysis performed on the bio-oil obtained: density of 0.91 g/ml, viscosity 10.839 cSt, acid number 46.954 mg NaOH/g sample, flash point 52oC, and the heating value 42.66 MJ/Kg. The figures are included in the range of physical characteristics of diesel-oil. Five (5) the dominant compound results of chemical analysis by GC-MS of the bio-oil from Ketapang rod by using a catalyst NiMo/NZA 3% by weight are: 3,4,4-trimethyl-2-nonene (10.29%), isobutylene (8.84%), 2,2-dimethyl-butane (8.05%), 3,4,4-trimethyl-2-pentene (5.76%), and 2-methyl-1-heptene (5.26%).  Keywords: Bio-oil, Pyrolysis, and Catalyst NiMo/NZA
Pirolisis Limbah Pelepah Sawit Menjadi Bio Oil Menggunakan Ni.Mo/Lempung Cengar Adelina Samosir; Syaiful Bahri; Aman Aman
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Fuel is a very important energy. The increase need fuel and diminishing avaibility of fossil fuel. It is also increasing awareness to find alternative energy technology. one of thesealternatives energy is bio-oil. bio-oil is a fuel, organic liquid produced by pyrolysis process. Pyrolysis of biomass a palm midrib. in a palm tree produces 40-50 midrib/tree/year so thatone hectare of palm can produce 6400 to 7500 midrib/year. manufacture of bio-oil with pyrolysis process can be done using Ni-Mo catalyst/Clay. This study aims to find the performance of the catalyst Ni-Mo/Clay Cengar (0%, 1%, 3% and 5% w / w biomass) against yeild bio-oil produced and characterize physical and chemical properties. pyrolysis palm midrib -40+60 mesh size of 50 grams, 0.5 grams of catalyst in 500 ml silinap performed at a temperature of 330 oC. The development Ni-Mo metal on clay cengar shown to affect the yield bio-oil is obtained, while the results obtained yield at 0%, 1%, 3% and 5%, respectively, 49.40%, 58.87%, 53.11% and 49.92%. bio-oil yield results that the maximum 58.87% obtained on treatment using a metal carrier Ni-Mo/clay cengar 1%. characterizationbiooil physical properties of of Ni-Mo/clay impurity 1% w/w has physical characteristics that density 0.9466 g/ml, 10.87 cSt viscosity, flash point 55C, and acid number 0.0751 g NaOH /g sample. based on the results of the analysis of the chemical components bio-oil is best obtained in the treatment bio-oil Ni-Mo/clay impurity 3% w/w bio-oil contains alcohol 7.35%, 0.35% phenol and other compounds 6.72% hydrocracking.Keyword : Bio-oil, a palm midrib, Pyrolysis, Ni.Mo/Clay Cengar
Co-Authors Abdul Rasyid Amrin Adelina Samosir Adi Mulyadi Putra Ahmad Fadli Ajat Sudrajat Amun Amri Ari Aditia Sukma Arrazaq, Naufal Raffi Jamrut Jamrut Kholid Irsani Lia Yuliana Nurwulandari Saputri Puji Rahmawati Dwi Sukma Rajib Azri Saefur Rochmat SYAIFUL BAHRI Thomson Simanjuntak Wahyu Ragil Wiwik Hendriani Zulkarnain Zulkarnain