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Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Core Subject : Engineering,
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Articles 3,145 Documents
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Pengaruh Kecepatan Pengadukan Terhadap Kinetika Reaksi Pembentukan Hidroksiapatit (HAp) Dari Precipitated Calcium Carbonate (PCC) Cangkang Telur Itik Melalui Proses Presipitasi Bintoro Bintoro; Yelmida Azis; Fajril Akbar
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

Hydroxyapatite (Ca10(PO4)6(OH)2) is a calcium phosphate compound that has been widely used as a bone implant material because its chemical composition is identical with natural bone. The purposes of this research are synthesis, characterization and study of kinetics of hydroxyapatite formation reaction with PCC (Precipitated Calcium Carbonate) base material of duck eggshell using precipitation method. In this study the samples were taken every 10 minutes as much as 10 mL for 1 hour of stirring, continued stirring up to 24 hours with variation of stirring speed (100; 150; 200; 250; 300 rpm) and ageing for 24 hours. The analysis of Ca concentration in the filtrate was done using the complexometry method. Hydroxyapatite is characterized by XRD. The crystalline structure and the calcium phosphate group in the sample indicate the hydroxyapatite compound. Kinetic synthesis reactions follow the second order equation with the value of reaction rate constant obtained by 0,6277, 0,7284, 0,7668, 0,5674, 0,6285 minutes-1. Keywords: Hydroxyapatite, kinetics reaction, PCC, duck’s eggshell, precipitation, second order
Analisis Kinerja Kompresor Gas Reciprocating C-401 Menggunakan Metode Kenaikan Enthalpy Di PT. Energi Mega Persada Rahmad Fauzi; Syafri Syafri; Asral Asral
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

In heavy lifting equipment that works pneumatically, the compressor is used in its function as an air filling device for power sources. A compressor when viewed from the way it works, there are two types of compressors, each of which works differently. The first type is a compressor with a positive displacement work method and the second is a compressor with a dynamic working method. Where the difference between the two types is the first positive displacement type compressor, this compressor model works by inserting air into a closed space, then at the same time the volume of the space is reduced, then the pressure inside will naturally increase. This high pressure which is used for various purposes in accordance with the designation of the compressor. This positive displacement compressor is used in reciprocating compressors and rotary. Meanwhile on the dynamic model compressor, the volume of space is fixed but the air inside the space is given speed. Then at the same time the speed is changed to pressure. This happens because the air in the room whose volume is still under pressure. Compressors that use this dynamic model are usually on turbo axial flow devices. Reciprocating gas compressors located at PT. Energi Mega Persada (EMP) Riau, has experienced a decline in performance, causing the performance of the compressor gas to be not optimal in compressing gas.Keywords: Enthalpy Rise Method, Reciprocating Gas Compressor, Peformance Decrease.
Pengaruh Kuat Arus Dan Laju Alir Pada Pengolahan Air Payau Menjadi Air Bersih Dengan Metode Elektrokoagulasi Menggunakan Reaktor Listrik Kontinyu Jhon Alperdo; Idral Amri; Drastinawati Drastinawati
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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Abstract

Brackish water was a usual the result of saltwater intrusion to the groundwater. It is due to the environmental degradation. Brackish water containing high levels of metal pollution like Fe, Cl, Mn, Zn, etc. Brackish water also usually having high levels of TDS and pH values brackish water acidic.Therefore, brackish water should be treated first that fit for using as fresh water. Brackish water treatment plant run based on the electrocoagulation. This method has the potential to purify brackish water and decrease the metal content contained such as Fe without the addition of coagulants. The purpose of this study was to determine the application of electrocoagulation to be used to neutralize pH, and reduce levels of TDS and Fe on brackish water and also to determine the effect of changes in flow rate and current to neutralize pH, and reduce TDS and Fe levels in brackish water. The parameters tested included pH, TDS (Total Dissolved Solid), and Fe using AAS. The electrocoagulation process uses electrical power that flows in the direction of the electrode. The electrocoagulation reactor was paired with a cable connected to the power supply then connected to an electric current with variations currents (1,4 ;2 ; 2,6 A) and variations in flow rate (0,53 ; 1,15 ; 2,7 L/min). The results of this study found that the optimum conditions were obtained at current of 2,6 A and flow rates of 0,53L/min with increasing pH from 5,8 to 6,8, decreasing TDS from 480 to 295 mg/L, Fe decrease of 66,97% from 0,5971mg/L to 0,1972 mg/L. Therefore, based on the results of parameter being tested, brackish water processed with electrocoagulation using continuous electric reactor is in line with the portable water quality standards based on Permenkes RI No.492-2010.Keywords: Brackish water, current, electrocoagulation, flow rate
Pengaruh Variasi Diameter Dan Jarak Kolom Campuran Abu Terbang Dan Abu Dasar Dengan Pola Segi Empat Terhadap Daya Dukung Tanah Gambut Aisyah Putri; Muhardi Muhardi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Group of columns that inserted in the soft soil will increase shear strength and density of the soil, reduce soil settlement and liquefaction potential, and increase bearing capacity ofthe soil. Things that must be considered in columns design are diameter, length, space, and pattern of the columns group. This study aims to see the effect of diameter and columnspacing on bearing capacity of peat. Variation of diameter that used in this study are 3 cm, 4 cm, and 5,5 cm. Variation of space that used in this study are 1,25D, 1,5D, and 1,75D.The results of laboratory testing indicate that increasing the diameter dan decreasing the space between columns will increase bearing capacity of stabilized peat. Maximumbearing capacity given by 5,5 cm diameter and 1,25D space variation. The increasing of bearing capacity reaches 74,49%. The results of theoretical analysis give different tendency.Increasing of diameter dan space between columns will increase bearing capacity of the stabilized peat. This tendency difference is due to the influence of overlap between soils withinthe unit cell due to the very close space of the column.Keywords : stone column, diameter, space, bearing capacity
Simulasi Dan Pemodelan Software Defined Network (SDN) Untuk Manajemen Jaringan Data UR Rian Arighi Mahan; Linna Oktaviana Sari; Ery Safrianti
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

Computer Network is the fundamental part of telecommunication. Computer network has been developed to fulfill the needs of humanity. Nowadays, the centralized network is needed to control the network traffic easily. Software Defined Network (SDN) is centralized network that provide the separated data plane and control plane in different system. This study provides the network Universitas Riau (UR) with SDN. The mininet was used to design and simulate UR design network using SDN. Theresult shows that the simulated network has the delay value of 0.506 ms. Compared to delay of UR existing network value of 13.874 ms, the simulated network provides a better performance than the existing network. In conclusion, SDN can be considered to implemented in UR network because its delay value is less than ITU standard 150 ms and less than existing network.Keywords : Network, Centralized, SDN, Delay.
Analisis Keandalan Transformator Daya Menggunakan Metode Distribusi Weibull Di Gardu Induk Garuda Sakti Pekanbaru Suryadi, Suryadi; Firdaus, Firdaus
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

To provide a reliable service, the power system must remain intact and able to cope with various problems that may occur. In this study discussed on Power Transformer Reliability Analysis Method Using Weibull distribution based on the value of the MTTF. Weibull statistics have been widely used as a mathematical method for calculating failure rate, reliability, and predict the remaining life time of equipment. From the calculation, the parameter value is 1.8402 shape and scale parameter value is 1.1711. MTTF value of 0.3597 years, the uptime value of 2.6402 years, reliability value of 0.8800.Keywords: Reliability, Distribution Weibull.
Karakteristik Hujan Jam-Jaman Berdasarkan Data Satelit TRMM JAXA Kabupaten Pelalawan Khotimah, Gina Khusnul; Handayani, Yohanna Lilis; Fauzi, Manyuk
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Rainfall characteristic is a feature or kind of rainfall every hour, in the rainfall duration or rainfall distribution. Rainfall duration is the time that counts as rainfall begin to descend until its stops. Rainfall distribution is expressed in a time function that describes the variation in depth of rainfall during expressed in the graph. Rainfall characteristic analysis in this research in Pelalawan Regency based on TRMM JAXA data. The results of this research its rainfall duration higher the average rainfall is also higher. The more of events then average rainfall is getting smaller. One hour duration the rainfall distribution similar uniform distribution, two hour duration the rainfall distribution similar Modified Mononobe distribution, three to nine hour and eleven to thirteen hour duration the rainfall distribution similar Alternating Block Method, and ten hour, fourteen to eighty one hour duration similar irregular distribution.Keywords: Rainfall Characteristic, Rainfall Duration , Rainfall Distribution.
Pengaruh Penggunaan Abu Bata Dan Semen Sebagai Bahan Pengisi (Filler) Terhadap Uji Karakteristik Marshall Pada Campuran Laston Lapis Antara (AC-BC) Fachrul Willian; Muhammad Shalahuddin; Gunawan Wibisono
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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Asphalt concrete is a mixture of asphalt, coarse aggregate, fine aggregate and filler. Many types of filler have been used to improve asphalt concrete performance. In this research, a combined ofbrick ash and portland cement was used as filler. As wasted products, this mixed filler can be used as an alternative replacement of Portland cement due to their similar chemical compounds. Thespecifications used follow the 2010 revision 3 Bina Marga General Specifications standard using the Marshall method. This research combined brick ash and portland cement at ratio of 0:100,25:75, 50:50, 75:25 and 100:0, asphalt content varied were 5%, 5.5%, 6%, 6.5% and 7%. The optimum fillers contents for each variation i.e. 6.08%, 6.43%, 5.83%, 6.20% and 5.50%respectively. The results present that all variations fulfill specification. The variation suggested as a mixture is a variation off 100:0, because that variations fulfill the specified spesifications economically.Keywords: portland cement, brick ash, AC-BC, Bina Marga Specifications 2010 Revision
Pengaruh Kadar Filler ZnO, Plasticizer Gliserol Dan Nisbah Air Terhadap Sifat Dan Morfologi Bioplastik Berbasis Pati Sagu Syahputra, Annur Fauzi; Bahruddin, Bahruddin; HS, Irdoni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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The need of plastic as plastic bags, food or goods packaging progressively increasing. Bioplastics is one alternative to conventional plastics that are harmful to the environment.one of the ingredients that can be used as bioplastics is starch, but starch-based bioplastics are still lacking at the mechanical properties. The purpose of this study was to determine thecharacteristics of sago starch, determine the effect of water ratio, the composition of the ZnO filler and plasticizer glycerol on mechanical properties and morphology of bioplastics. Sagostarch was tested for the composition of amylose and amylopectin, while the bioplastics is tested for mechanical properties such as tensile strength (tensile strenght), elongation, wateruptake, biodegradation, and dispersion of the filler through SEM (Scanning Electron Microscopy) and analyzed using Response Surface Methodology (RSM) , Significance levelused in this study is 0.05 so that the most significant variables can be determined from pvalue value of <0.05 and a lack of fit> 0.05, which indicates that the model according to theresearch results. The factors that most significantly influence all responses are ZnO filler composition and followed by the plasticizer and water ratio. Best results are obtained on thecomposition of 15% filler, plasticizer 10% and the ratio of water 100 ml with a tensile strength of 15.484 MPa, elongation 2.691%, water uptake 28%, and 22.12% biodegradation.Key Words : bioplastics, filler ZnO, glycerol, starch, biodegradation
Adsorpsi Tembaga (Cu (II)) Menggunakan Limbah Cangkang Kepiting Rida Sari Juli Anti; Drastinawati Drastinawati; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Adsorption is one of the most widely used techniques for controlling water pollution. Adsorption kinetics are very important to determine the performance of the adsorbent and get the mechanism that occurs during the adsorption process. The purpose of this study was to determine the effect of metal concentration and adsorption time on crab shell absorption and to test the Cu (II)adsorption kinetics model using pseudo first order (Lagergren) and pseudo second order kinetics (Ho and McKay). Cu (II) solution with varying concentrations of 1,981 mg/l; 4,138 mg/l and6,263 mg/l are adsorbed using crab shells. The solution sample was taken with a time interval of 0, 10, 20, 30, 60, 90, 120 and 150 minutes as much as 10 mL then centrifuged. The centrifugedfiltrate is then analyzed using AAS to measure the remaining Cu (II) concentration. The results showed that the highest of adsorption capacity at the concentration of Cu (II) metal 1,981 mg/lwas 0,737 mg/g in the 30 minute; the concentration of 4,138 mg/l was 1,784 mg/g in the 60 minute and the concentration of 6,263 mg/l was 2,816 mg/g in the 90 minute. The fitted kineticmodel for Cu (II) adsorption using crab shells is pseudo second order model (Ho and McKay) with k2 value is 2,225; 1,432; 1,345 g/mg.min and qe value is 0,737; 1,784; 2,816 mg/g for aconcentration of 1,981; 4,138 and 6,263 mg/l.Keywords : adsorption, crab shells, Cu (II), adsorption capacity, kinetics.

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