cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota pekanbaru,
Riau
INDONESIA
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Engineering
Arjuna Subject : -
Articles 3,145 Documents
 214   215   216   217   218 
Proses Seeding Dan Aklimatisasi Kultur Tercampur Pada Pengolahan Anaerob Limbah Cair Produksi Minyak Sawit Gusti Rahayu; David Andrio; Nina Veronika
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Palm Oil Mill Effluent (POME) was high strength organic wastewater contained COD 50.000 – 70.000 mg/l. Mixed cultures used in this research is from cow dung. To increase concentration of bacteria on the inokulum and decreased lag phase on anaerobic treatment for treat it, the anaerobic mixed culture bacteria should be seeding process and acclimatized toward POME. The bioreactor of seeding process and acclimatization using circulating batch reaktor with worked volume 15 L and 5 L, respectively. Ratio wastewater to biomass bacteria was 70:30 (% V/V). This study use 3 variation of heat temperature of mixed culture anaerob that is 35° C for 1 hour; 70° C for 30 minutes; 100o C for 15 minutes with control. The parameter observed in this research was VSS and COD. Seeding process was doing in 5 days with highest VSS on day’s 5 was 8.280 mg/L and COD total concentration was 36.454 mg/L. Acclimatization process was doing on three stages, each of the 5 days. The most increase of VSS at the third stages of acclimatization was found within R1 (heat pretreatment inoculum 35° C for 1 hour) was 880 mg/L/day and the most reduction of soluble COD was found within R3 (heat pretreatment inoculum 100° C for 15 minutes) was 14,30%. Keywords : POME, mixed culture, circulating batch reactor,seeding, acclimatization, COD, VSS,
Uji In-Vitro Hidroksiapatit Berpori Menggunakan Larutan Simulated Body Fluid (SBF) Dengan Variasi Penambahan Pati Kentang Deska Deska; Ahmad Fadli; Zultiniar Zultiniar
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

One method of biological hydroxyapatite testing is in vitro, which is testing material outside the system or not directly on living things. Some ways include using cell culture media, test tubes or Simulated Body Fluid (SBF) solutions. The purpose of this study was to test in-vitro porous hydroxyapatite with variations in potato starch using a Simulated Body Fluid (SBF) solution. This research was conducted by mixing 4 and 6 grams of potato starch with 12 grams of HA, 35 mL aquadest. The slurry is stirred at 150 rpm for 3 hours. Then the slurry is put into a mold and dried in an oven at 80˚C for 24 hours and 120˚C for 8 hours. The dried green bodies are burned at 600°C and the sintering process at 1250°C. Furthermore porous hydroxyapatite was soaked using the SBF solution for 28 days. Samples were analyzed using XRD analysis and SEM analysis. Based on SEM analysis apatite layers were formed in all samples. Samples had an average pore diameter of 96.66 μm and 105.8 μm. Where the crystallinity value of the samples obtained by 73.75% and 77.19%. The addition of potato starch to the sample can enlarge pore diameter, facilitate ion exchange and increase sample resistance during the immersion process using SBF solution.Keywords: potato starch, hydroxyapatite, Simulated Body Fluid, in-vitro test
Pemanfaatan Limbah Oil Sludge Untuk Campuran Beraspal Jenis Laston Pengikat (AC-BC) Dengan Pengujian Marshall) Trivia Ariska; Gunawan Wibisono; Alfian Malik
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Petroleum industry has an important role in supplying fuel necessaries. In process to produce pretoleum crude oil into various of petroleum based products also emerged waste products includesolids, liquids and gases. Solid waste products which found from poduction activities of the industry produce called Oil Sludge. Oil sludge is categorized as hazardous and toxic waste (B3) because the characteristic and the concentration can contaminate the environment. This research aims to investigate the potential of oil sludge as a partial replacement of asphalt in Asphalt Concrete -Binder Course (AC-BC). In this study the variation of oil sludge addition was 0%, 4%, 6% and 8% of the weight of asphalt. The addition of oil sludge decreased the optimum asphalt content (OAC) and increased the unit weight of the asphalt concrete mixture. This is caused by the fine grains contained in the oil sludge. Based on the Marshall characteristics test results, the maximum allowable content of oil sludge that could be used was 4% with 6.65% of OAC and 948,03 kg of average stability value which satisfied the specifications of Bina Marga 2010 Revision 3.Keyword : oil sludge, asphalt concrete, AC-BC, marshall, Specification of Bina Marga 2010 Revision 3
Kalibrasi Metode Clark Dan Snyder Durasi 3 Jam Dan 6 Jam DAS Siak Bagian Hulu Dengan HEC-HMS Rohman Rosyid; Yohanna Lilis Handayani; Bambang Sujatmoko
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Upper Siak watersheds have increased discharge due to land use change. This study aims to determine the method of transforming the Upper Siak watershed. Various hydrological modeling to calculate flood discharge has been developed, one of which used in this research is HEC-HMS (Hydrologic Engineering Center-Hydrologic Modeling System). The transform method used is the Clark method and the Snyder method for modeling the HEC-HMS output flood discharge. Input calibration is daily rainfall data, hourly discharge, and 2012 land use map. Based on the calibration results showed that the method of flood discharge Clark duration of 3 hours and 6 hours have Percent value error in peak flow of 0.00 and 0.02. Snyder method of 3 and 6 hours duration have error value in peak flow of 0.01 and 0.01.Keywords: land use change, calibration, flood discharge, HEC-HMS
Analisis Pengaruh Penyekatan Kanal Terhadap Pembasahan Di Lahan Gambut (Studi Kasus: Desa Lukun, Kecamatan Tebing Tinggi Timur, Kabupaten Kepulauan Meranti) Rahmayati Aprillia Putri; Rinaldi Rinaldi; Sigit Sutikno
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

One of the factors causing fires in peatlands is due to the condition of dry peat. This condition can be caused by uncontrolled human activities such as digging canals that can lead a significant decreasing change of groundwater level in peatlands and cause peat to become dry. The Government of Indonesia, through BRG, is attempting to Rewetting the peatland by canal blocking. How effective the impact of canal blocking is analyzed in this study. To analyze the fluctuation of groundwater level as impact of canal blocking changes before and after canal blocking using water level loggers. Groundwater level monitoring was carried out on 3 transects, namely, 1 transect in the downstream side which is 100 m from the canalblock and 2 transects in the upstream side which is 114 m and 491 m from the canal block. The results showed that the canalblock had a good impact for keeping groundwater elevation and keeping peatland on always wet condition until 419 m with an increase of 0,005 m to the upstream area from canalblock and around 240 m with an increase of 0,005 m perpendicular to the canal.Key words: peatland, canal blocking, Rewetting
Penyisihan Kadar COD Dan TSS Pada Limbah Cair Pewarnaan Batik Mengunakan Metode Elektrokoagulasi Yesi Arnita; Shinta Elystia; Ivnaini Andesgur
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Wastewater from the textile industry has adverse effects on the environment if disposed of into the waters without any processing. Naphtol is one of the sources of pollutant wastewater coloring batik. Electrocoagulation is one of the alternative method of processing wastewater textiles. This research aims to know the efficiency decreased levels of COD and TSS contained in wastewater through the process electrocoagulation. Research carried out in batch by using aluminium as electrodes that size 17cm by 17cm x 3cm. The size of the reactor electrocoagulation is 30cm x 25cm x 25cm, 1 cm electrode spacing and waste from Volume 10 L. The voltage used was 10, 15, and 20 volts and then sample taken on 15, 30 and 45 minutes while electrodes from the electricity. The analysis showed a decrease in concentration on the parameters of the tested where the span of the efficiency of the allowance for a maximum range of the COD (80-00, 98, 20 %) and TSS (90, 83 % - 95, 83 %). This condition occurs at the time of tension 20 volts in 45 minutes. Based on the Anova to use SPSS.16, found that the voltage and time factor affecting the decrease in the concentration of 94.8% COD and TSS 93.1%. The rest is affected by unknown factors.Keywords: Electrocoagulation, wastewater batik, voltage, contact time, COD
Pembuatan Biodiesel Dari Minyak Biji Kapuk (Ceiba Pentandra) Dengan Katalis Lempung Teraktivasi; Pengaruh Kecepatan Pengadukan Erlisa Yanuari Putri; Syaiful Bahri; Edy Saputra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Biodiesel producted by transesterifiation reaction which on energy source. Biodiesel was developed in Indonesia as an anticipatis of energy crisis problem suppported by goverment national energy policy. This research is aimed to make biodiesel from cotton seed oil, studying the effect of agitation speed to the amount of biodiesel produced and determined the best catalyst activated by acid or base, and determined the characteristics of biodiesel produced. The transesterification process was occured at a temperature of 60oC, on weight of oil 100 grams, reaction time 1,5 hours, mole ratio of oil to methanol 1 : 9, catalyst concentration 0,5% -weight of oil for varions of agitation rate 400, 500 and 600 rpm, and variations of catalyst acid 0,47, 0,62 and 0,78% and alkaline activated with a concentration of 0,33, 0,44 and 0,66%. From the result was obtained the highest biodiesel yield of 95,45% for alkaline activated 0,66% for agitation speed of 400 rpm. Characterization of physical properties of biodiesel obtained here density of 878 kg/m3, 3,03 mm2/s kinematic viscosity, acid number 0.34 mg KOH/g sample, and the flash point 195oC.Keywords: biodiesel, clay catalysts, activation of acids and bases, transesterification
Efek Aktivasi H2SO4 Terhadap Lempung Sebagai Katalis Dalam Pembuatan Biodiesel Dari Crude Palm Oil (CPO) Muhammad Disro; Syaiful Bahri; Khairat Khairat
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Indonesia petroleum consumed are increasing, while hot Indonesia's petroleum reserves are depleting so that fuel substitution needs to be sought. Recent years, a lot of research has done, purposed to find an alternative source one of that is biodiesel. Raw material for biodiesel production can be from animal fat or vegetable oil. Crude palm oil (CPO) one of an alternative raw material. This research is aimed to produce biodiesel from CPO, studying factors which influences production process, such as catalyst, recycle and regeneration as well as to determine the physical and chemical properties of biodiesel produced. The transesterification process was done, a mole ratio of oil: methanol 1: 9, oil mass 50 grams, weight of the catalyst 1%-wt, having temperature of 60°C for 90 minutes. Clay catalysts are activated with acids, and then recycle and regeneration of catalyst. Result given by of alkaline activation of the catalyst 90.16%. Based on characterization of physical properties of biodiesel, result as follow density 0.869 g/ml, kinematic viscosity 4,65 mm2/s, the flash point 120oC and cetane number 51,74. The catalyst regeneration proved not a 100% of catalyst reactived.Keywords: biodiesel, clay, recycle, regeneration, transesterification
Permodelan Resiko Sistem Manajemen Integritas Pada Jaringan Pipa Transmisi Gas Alam Di Energi Mega Persada (EMP) Bentu Ltd Dengan Menggunakan Standar API RP 581 Ardi, Muhammad; Syafri, Syafri
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In order to identify the reliability level of the pipeline which is one of the company's assets stated by this critical equipment. Diversity in the gas production plant, an integrated methodology with economic operational conditions, equipment life and in accordance with the direction of achieving a reliable, safe goal for the entire life of the design. The solution to reduce the risk of decreasing production in the Oil and Gas industry sector is one of the risks caused by the low reliability of the pipeline, not even identified at all, the Pipeline Integrity Management System includes modeling or simulation carried out through a continuous assessment process of a system in terms of design, construction, operation, maintenance in accordance with natural gas pipelines. The action taken to implement this modeling is to find and integrate existing information, identify the causes of failure and carry out risk analysis, develop integrity management plans, implement integrity management programs namely inspection and surveiy, analyze the results to decide the right program (repair or replacement) of the pipeline network, evaluates the actions taken, then reports and makes continuous improvements.Keywords: Pipeline, inspection, maintenance, repair, Pipeline Integrity Management System, Risk assessment.
PERAMALAN JUMLAH PENERIMAAN SISWA BARU DI SSEKOLAH DASAR DHARMMALOKA PEKANBARU DENGAN MENGGUNAKAN METODE EXPONENTIAL SMOOTHING Salim, Kelvin Rainey; Sari, Linna Oktaviana
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

To be able to make informed decisions regarding school policy, one of them is to determine the prediction of the number of students receiving on new academic school year. Prediction is one of the keys to success of decision making because the value of predictions of new students can be used as a reference to determine a decision. The Single Exponential Smoothing method is used to determine the predictions of student acceptance in the period of the next school year. Exponential Smoothing method is a fairly good forecasting method for long-term and medium-term forecasting. The main advantage of the Exponential Smoothing method is that it is seen from the ease of operation that is relatively low, there is little doubt whether better accuracy can always be achieved using (QS) Quantitative systems or deconposition methods that are intuitively interesting. Data to be processed is the number of student admissions for the period 1999/2000 to 2018/2019 and presented in the data for the academic year. The results obtained from this study are the results of analysis of a single exponential method to obtain information on predictions of new student admissions and the level of accuracy with MAPE.Keywords: prediction, forecasting, Single Exponential Smoothing, quantitatif.

Page 216 of 315 | Total Record : 3145

 214   215   216   217   218 

Filter by Year

2014 2022


Reset
Filter By Issues
All Issue Vol 9 (2022): Edisi 1 Januari s/d Juni 2022 Vol 8 (2021): Edisi 2 Juli s/d Desember 2021 Vol 8 (2021): Edisi 1 Januari s/d Juni 2021 Vol 7 (2020): Edisi 2 Juli s/d Desember 2020 Vol 7 (2020): Edisi 1 Januari s/d Juni 2020 Vol 6 (2019): Edisi 2 Juli s/d Desember 2019 Vol 6 (2019): Edisi 2 Juli s/d Desember 2019 Vol 6 (2019): Edisi 1 Januari s/d Juni 2019 Vol 6 (2019): Edisi 1 Januari s/d Juni 2019 Vol 5 (2018): Edisi 2 Juli s/d Desember 2018 Vol 5 (2018): Edisi 2 Juli s/d Desember 2018 Vol 5 (2018): Edisi 1 Januari s/d Juni 2018 Vol 5 (2018): Edisi 1 Januari s/d Juni 2018 Vol 5, No 1 (2018): Wisuda April Tahun 2018 Vol 5, No 1 (2018): Wisuda April Tahun 2018 Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017 Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017 Vol 4, No 1 (2017): Wisuda Februari Tahun 2017 Vol 4, No 1 (2017): Wisuda Februari Tahun 2017 Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016 Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016 Vol 3, No 1 (2016): Wisuda Februari Tahun 2016 Vol 3, No 1 (2016): Wisuda Februari Tahun 2016 Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015 Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015 Vol 2, No 1 (2015): Wisuda Februari Tahun 2015 Vol 2, No 1 (2015): Wisuda Februari Tahun 2015 Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014 Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014 Vol 1, No 1 (2014): Wisuda Februari Tahun 2014 Vol 1, No 1 (2014): Wisuda Februari Tahun 2014 More Issue