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Drag Reduction Suspensi Bakteri Selulosa pada Aliran Crude Oil dalam Pipa Spiral Yanuar, Yanuar; Kurniawan, Kurniawan; Rendi, Rendi; Habib, Habib; Edwin, Edwin; Vaul, Vaul
Jurnal Energi Dan Manufaktur Vol 8, No 1 (2015): April 2015
Publisher : Jurnal Energi Dan Manufaktur

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Abstract

Pressure drop adalah salah satu aspek penting yang mempengaruhi konsumsi energi yangdigunakan dalam suatu transportasi fluida menggunakan pipa. Drag Reduction Agent (DRA)merupakan salah satu alternatif untuk mengurangi timbulnya pressure drop pada aliran fluidadalam pipa dengan menambahkan sejumlah zat aditif kedalam aliran. Zat aditif yang digunakandalam penelitian ini berupa fiber bakteri selulosa. Penelitian ini bertujuan untuk mengetahuikarekteristik drag reduction dalam aliran minyak mentah (crude oil) dalam pipa spiral denganrasio P/Di 7.6. Re= 10^3 - 5.10^4. Dalam penelitian ini juga digunakan pipa bulat dengandiameter 17 mm sebagai pembanding. Penambahan bakteri selulosa dengan konsentrasi 250ppm, 500 ppm, dan 750 ppm pada aliran crude oil dapat mengurangi drag pada pipa spiralataupun pipa bulat. Drag reduction pada pipa bulat sebesar 15 % dan pada pipa spiral 13 %.Kata kunci : Pressure drop, bakteri selulosa, crude oil, pipa spiral.Pressure drop is one of the important aspects that influence the energy consumption used in atransport fluid using a pipe. Drag Reduction Agent (DRA) is one alternative to reduce theoccurence of pressure drop in the fluid flow in a pipe by adding additives into the flow. Additivesused in this study is bacterial cellulose fiber suspension. This study aims to determine thecharacteristics of drag reduction in the flow of crude oil in a spiral pipe with the ratio P/Di 7.6.Reynolds number was 10^3 - 5.10^4. In this study also used a circular pipe with a diameter of17 mm for comparison. The addition of bacterial cellulose with a concentration of 250 ppm, 500ppm, and 750 ppm in the crude oil flow to reduce drag in spiral pipe or circular. From thisresearch, the drag reduction on circular pipe by 15% and 13% in the spiral pipe.Keywords : Pressure drop, bacterial cellulose, crude oil, spiral pipe
Emisi Metan Sektor Pertanian Kampung Iklim Desa Mukti Jaya Kecamatan Rimba Melintang Kabupaten Rokan Hilir Provinsi Riau Desvita, Yenny; Erwin, Erwin; Yanuar, Yanuar; Saam, Zulfan
Dinamika Lingkungan Indonesia Vol 6, No 1 (2019)
Publisher : Universitas Riau

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Methane emissions of agriculture sector in Indonesia from year to year increase. To reduce the rate of methane emissions increase, the Indonesian government in 2012 through the Ministry of Environment launched the Kampung Iklim program. One of the villages included in Kampung Iklim Program is Mukti Jaya Village, Rimba Melintang Sub-district, Rokan Hilir Regency, Riau Province. This research aims to analyze methane emission model of agriculture. The research was conducted through survey by field research method. Research location in Mukti Village Rimba Melintang District Rokan Hilir Regency Riau Province. The value of methane rice land emissions in Mukti Jaya Village from 2011-2015 has increased due to changes in some methane producing parameters. The use of Cisadane varieties produced the highest methane emissions compared to the Ciherang and Dodokan varieties of 0.00029 Gg CH4/year/ ha.
Exploring the Link between Supply Chain Agility, Supply Chain Cost, Supply Chain Responsiveness, Global supply Chain Risk Management, and Contribution in Global Manufacturing: An Indonesian Perspective Arifin, Agus Zainul; Yanuar, Yanuar; M.N, Nuryasman
International Journal of Supply Chain Management Vol 7, No 5 (2018): International Journal of Supply Chain Management (IJSCM)
Publisher : International Journal of Supply Chain Management

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During last decade, supply chain management has emerged as a key for sustainable completive advantages. Increasing globalization has given birth to new philosophies and businessman has started focusing on the new ways of occupying market share. However, the share of Indonesia in global production has decreased from 31.953% in the start of this year to 20% in 2017. Which shows a gradual decrease of 11% in 16 years. To address this issue, the ultimate objective of this study is to develop a framework to boost global manufacturing through supply chain activities. This objective was achieved by examining the effect of supply chain agility, effective supply chain cost, supply chain responsiveness and risk management practices. Survey questionnaires was used to collect the data and PLS SEM used to analyze the data. It is found that supply chain agility, effective supply chain cost and supply chain responsiveness has significant positive effect on global manufacturing. Moreover, risk management practices as a moderating variable strengthen this effect and enhances the global manufacturing activities. 
PENENTUAN SIFAT MAGNETIK PASIR DAN DEBU SEPANJANG JALAN KARTAMA KOTA PEKANBARU MENGGUNAKAN MAGNETIC PROBE PASCO PS-2162 Nainggolan, Maria Sonya Nauli; Erwin, Erwin; Yanuar, Yanuar; Malik, Usman
Komunikasi Fisika Indonesia Vol 16, No 1 (2019)
Publisher : Universitas Riau

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Topsoil is the recipient of various kinds pollutants, especially heavy metals. Heavy metals have been detected in sand and dust along the highway. Measuring the magnetic properties of road sediment along Kartama road in Pekanbaru City has been done. The magnetic properties measured are magnetic degree, magnetic and mass susceptibility using magnetic induction measurement.  The Samples were taken at sixteen locations with the amount of 1 or 2 kg for each point location, the samples were named as samples 16, 7a7e, 8a8e. The magnetic particles of the samples were separated from sand and dust using Iron Sand Separator and later using Neodymium Iron Boron (NdFeB) magnet. The total magnetic induction of the samples and concentrates were measured using Pasco Magnetic Probe PS-2162. In order to measure the magnetic induction of the samples, a solenoid of 3 cm in diameter, length of 10 cm and 2000 of windings was made. The empty solenoid magnetic induction was measured as a function of applied current ranging from 210 A and as a function of horizontal distance of 15 mm from the the solenoid ends. Total magnetic induction (samples and concentrates) was measured for the applied currents of 6 A. The results showed that the highest magnetic degree obtained from the sample number 7e that is 2.54% and the lowest level obtained from the sample number 3 that is 0.17%. The highest magnetic susceptibility value obtained from the sample number 7b was is 9158.12 , and the lowest magnetic susceptibility value obtained from the sample number 2 with the value of 3125.52 . Based on the mass susceptibility values of the concentrate obtained that the sand and dust along the road Kartama Pekanbaru which are in the interval 4.6 to 8.0, they implies that the mass susceptibility of the samples is in the range of Ilmenite phase FeTiO3or antiferromagnetic.