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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 : Department of Mechanical Engineering, University of Udayana

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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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/dli.6.1.p.20-25

Abstract

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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Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.16.1.12-19

Abstract

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. 
Penerapan Model Student Teams Achievement Division Terhadap Kemampuan Pemahaman Konsep Matematika Siswa Kelas VIII Yanuar, Yanuar; Sukmawati, Klara Iswara; Arifin, Samsul
UNION: Jurnal Ilmiah Pendidikan Matematika Vol 7, No 1 (2019)
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (567.09 KB) | DOI: 10.30738/union.v7i1.3151

Abstract

Matematika merupakan salah satu cabang ilmu pengetahuan yang sangat penting. Hal ini dikarenakan matematika berguna bagi kehidupan manusia dan juga mendasari perkembangan teknologi modern, serta peran penting dalam berbagai disiplin dan memajukan daya piker manusia. Namun data dari TIMSS 2011 menunjukan bahwa kemampuan siswa khususnya kemampuan pemahaman konsep masih rendah. Kemampuan pemahaman konsep adalah hal yang paling mendasar dalam pembelajaran matematika karena sebagai prasyarat untuk menguasai materi selanjutnya. Salah satu pembelajaran yang dapat digunakan sebagai upaya untuk mengembangkan kemampuan pemahaman konsep matematis siswa adalah pembelajaran Student Teams Achievement Divisions (STAD). Penelitian ini bertujuan untuk mengetahui apakah rata-rata kemampuan pemahaman konsep matematis siswa yang memperoleh dengan pembelajaran STAD lebih tinggi dibandingkan dengan siswa yang memperoleh pembelajaran yang diterapkan disekolah. Penelitian ini merupakan penelitian kuantitatif menggunakan metode eksperimen dengan desain quasi eksperiment tipe non equivalent posttest only control group design. Populasi dalam penelitian ini adalah seluruh siswa kelas VIII SMP Negeri 1 Simpang Pesak, Belitung Timur dengan jumlah sampel 80 siswa. Instrumen yang digunakan dalam penelitian ini yaitu tes kemampuan pemahaman konsep matematis siswa. Teknik pengambilan sampel menggunakan convenience sampling. Sampel pada penelitian ini adalah siswa kelas VIIIB sebagai kelas eksperimen sebanyak 20 siswa dan kelas VIIIC sebagai kelas kontrol sebanyak 20 siswa. Berdasarkan pengolahan data menggunakan Mann Whitney diperoleh nilai Zhitung = 2,090 dan Ztabel = 1,65, dikarenakan  Zhitung > Ztabel, maka dapat disimpulkan bahwa rata-rata kemampuan pemahaman konsep matematis siswa yang memperoleh pembelajaran STAD Lebih tinggi dibandingkan dengan siswa yang memperoleh pembelajaran dengan konvensional.
Karateristik dan Peramalan Pasang Surut di Perairan Pagar Jaya, Lampung T, M Iskandar Wijaya; Yanuar, Yanuar
Proceeding Simposium Nasional Kelautan dan Perikanan No 6 (2019): PROSIDING SIMPOSIUM NASIONAL VI KELAUTAN DAN PERIKANAN
Publisher : Proceeding Simposium Nasional Kelautan dan Perikanan

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Abstract

Pasang surut adalah peristiwa alam tentang naik turunnya permukaan air laut yang terjadi secaraberulang-ulang dan teratur karena adanya gaya gravitasi benda ? benda di langit terutama bulandan matahari terhadap massa air laut di bumi. Karateristik dan peramalan pasang surut dapatdiketahui dengan cara perhitungan mengenai data amplitudo dan beda fase yang merupakankomponen pasang surut. Peramalan pasang surut ditujukan untuk memperoleh informasi tinggimuka air laut di masa mendatang pada saat dan lokasi tertentu. Penelitian ini bertujuan untukmengetahui karateristik pasang surut dengan metode Admiralty meramalkan pasang surut denganmenggunakan software World Tide dan mengetahui kedudukan muka air laut di perairan DesaPagar Jaya, Lampung selama 5 tahun ke depan. Penelitian ini dilaksanakan pada tanggal 8 April ?22 April 2019 di Perairan Desa Pagar Jaya Lampung. Data yang digunakan dalam penelitian iniadalah data pasang surut pengamatan pada lokasi penelitian dan koordinat lokasi penelitian.Metode yang digunakan dalam penelitian ini adalah metode studi kasus dimana dalam penelitianini data penelitian berupa angka yang dianalisa secara kuantitatif dengan metode Admiralty danWorld Tide yang akan menghasilkan karateristik pasang surut di perairan berupa nilai koefisienyang akan digunakan untuk mengetahui tipe pasang surut, LLWL dan HHWL di suatu perairan.Hasil penelitian dengan mengunakan metode Admiralty menunjukan bahwa tipe pasang surut diPerairan Desa Pagar Jaya, Lampung adalah tipe pasang surut campuran condong ke harian gandaatau mixed tide prevailing semidiurnal dengan nilai Formzahl sebesar 0,52. Nilai Mean Sea Level(MSL) sebesar 96 cm, nilai Higest High Water Level (HHWL) sebesar 167 cm, dan nilai LowestLow Water Level sebesar 25 cm. Peramalan pasang surut menggunakan World Tides dengan nilaiMRE sebesar 0,3% menunjukan bahwa HHWL tertinggi terjadi di bulan Desember 2021 dengannilai sebesar 178 cm dan LLWL terendah terjadi di bulan Juni 2021 dengan nilai sebesar 19 cm.Kata kunci: pasang surut, peramalan, admiralty, world tides, Lampung
Transformasi Masyarakat Miskin Menjadi Entrepneur Melalui Kolaborasi Yanuar, Yanuar
Jurnal Manajemen Vol 15, No 1 (2011): February 2011
Publisher : Fakultas Ekonomi dan Bisnis, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jm.v15i1.407

Abstract

The poverty is one of the critical problems that a nation has because it will decrease the citizen living such as bad condition of their health, lack of nutrition, low level of ecucation, les productivity which affects on the national productivity.
PENGARUH PERATURAN BANK INDONESIA TENTANG KREDIT UMKM TERHADAP TOTAL KREDIT, RASIO KREDIT UMKM, RISIKO, EFISIENSI DAN PROFITABILITAS BANK PEMBANGUNAN DAERAH Santosa, Bagus; Yanuar, Yanuar
Jurnal Manajemen Bisnis dan Kewirausahaan Vol 4, No 2 (2020): Jurnal Manajemen Bisnis dan Kewirausahaan
Publisher : Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmbk.v4i2.7522

Abstract

This research aims to analyze the effect of Bank of Indonesia Regulation on Micro, Small, and Medium Enterprises (MSME) loans towards the Loan Disbursed, MSME Loan Ratio, Risk, Efficiency, and Profitability of Regional Development Banks.  This research analyzes the financial data from 10 BPDs over 10 years period to understand the Loan Disbursed, MSME Loan Ratio, Risk, Efficiency, and Profitability of the BPDs before and after the implementation of Regulation Number 14/22/PBI/2012. The financial data were analyzed using the Paired-Sample t-test. Findings show that the overall loan disbursed by BPDs in the period of 2013-2017 or after the Regulation on MSME loans was implemented, is higher than that in the period of 2008-2012 or before the regulation was implemented. However, while the regulation aims to increase the MSME loan disbursed by the banks, the MSME Loan Ratio in the period of 2013-2017 was lower than that in the period of 2008-2012. The Risk, measured by Non-Performing Loan, in the period of 2013-2017 was also increased. The regulation also affects the profitability of the BPDs negatively. The Efficiency, measured by Operating Expenses Operating Income, was not significantly affected by the regulation. The results may inform the regulators to assist the BPDs in responding to the regulation so it could affect BPDs in a more positive way. This may also inform the banks on their financial conditions so they can plan for strategic approaches and develop appropriate schemes on disbursing MSME loans.
FAKTOR-FAKTOR YANG MEMENGARUHI PROFITABILITAS BANK UMUM SYARIAH DI INDONESIA Phuanerys, Eliza Christabella; Yanuar, Yanuar
Jurnal Manajemen Bisnis dan Kewirausahaan Vol 4, No 3 (2020): Jurnal Manajemen Bisnis dan Kewirausahaan
Publisher : Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmbk.v4i3.7908

Abstract

This study was conducted to analyze the effect of the Capital Adequacy, Asset Quality, Management Efficiency and Liquidity Management ratios on profitability proxied by bank Return On Assets (ROA), by analyzing the annual financial statements that have been published in 2013-2017. The variables used in analyzing the financial statements of Sharia Commercial Banks that are sampled are Asset Quality which is proxied by Non Performing Financing (NPF), Liquidity Management which is proxied by Financing to Debt Ratio (FDR), Management Efficiency proxied by Net Operating Margin (NOM), and Capital Adequacy proxied by Capital Adequacy Ratio (CAR). The sample in this study was 11 Islamic commercial banks for 5 years, namely 2013-2017. The results showed that Capital Adequacy, Asset Quality, and Liquidity Management significantly influenced the profitability of Islamic commercial banks. Whereas Management Efficiency does not affect the profitability of Islamic commercial banks. Based on these results, Sharia Commercial Banks in Indonesia must increase capital, reduce problematic financing by improving internal processes, and increase bank liquidity by increasing fundraising.