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INDONESIA
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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Isolasi Kitin Dari Limbah Cangkang Kepiting (Scylla SP) Dengan Variasi Pelarut Pada Proses Bleaching Frederika Mawarni Adilasari Nduru; Drastinawati Drastinawati; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Crab shell is a waste that reach 50-60% of total weight, with chitin content of 20-30%. Chitin is biopolymer commercially used in biochemistry, medicine, textile, agriculture and others. The main aim of this research is to compare the level of lightness and whiteness of chitin produced in the bleaching process with organic and inorganic solvents. The research was started by reducing the size of the crab shell into a powder. Chitin was isolated by deproteination process using 3.5% NaOH and demineralization process using HCl 1N, followed by bleaching process with organic solvents variation of methanol; ethanol; acetone; ethanol:acetone (1:1), inorganic solvents of NaOCl 4%; Ca(OCl)2 3%; H2O2 3%, and the combination of acetone fallowed by NaOCl 0.315%. The result obtained is chitin without bleaching process with a yield of 24.44%, water content of 4%, and ash content of 1.75%. The IR spectrum analyzed before and after bleaching process showed relativity similiar absorption and were not affected by the solvent used in bleaching process. The color of chitin was analyzed using colorimeter. The result is the use of acetone fallowed by NaOCl 0.315% yileding chitin with 100% lighteness, 99.95% whiteness and categorized as white.Keywords: bleaching, crab shell, chitin, lightness, and whiteness.
Coworking Space Di Pekanbaru Dengan Pendekatan Prinsip Arsitektur Organik Frank Lloyd Wright Silmi Azula; Wahyu Hidayat; Yohannes Firzal
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

The high growth of start-ups in Pekanbaru has resulted in a growing need for office facilities that allows workers to be able to rent work facilities. However, the rental office are currentlyless efficient. This has become one of the difficulties, especially for new start ups. So coworking space is needed as a public space facility that can function as a container for work. Coworking space is workspace facility that is used together, shared and open by everyone. In building coworking space must also be able to share with the environment.Therefore, the selection of Frank Lloyd Wright's organic architectural principles was deemed appropriate for the design of coworking space buildings. The data collection methods usedare primary and secondary data. The result of this design is the design of coworking space Pekanbaru with the principle approach of Frank Lloyd Wright's Architecture. Using case studies with the same functions and themes, as well as the application of the principles of Frank Lloyd Wright's Architecture consisting of simplicity and calmness, design style,natural correlation, natural color, material properties, and spiritual integrity.Keywords: Coworking space, Frank Lloyd Wright, Organic
Pengaruh Penambahan Kapur Dan Abu Batu Bata Terhadap Nilai Kuat Tekan Bebas Dan CBR Pada Tanah Lempung Kecamatan Tenayan Raya Prayogo, Giri; Nugroho, Soewignjo Agus; Fatnanta, Ferry
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Abstract

A Tenayan Raya subdistrict is an area where there is an adequate thick of clay layer. This condition is seen during rain that the soil become softer, while in dry conditions there are many cracks on that soil. In case, it can cause some damages to the building due to the tilt of the building's foundation as an effect of shrinkage soil. Tenayan Raya also known as a brick production area. The brick production process may generate ash as a waste of brick kilns which has not been utilized optimally. This study aims to utilize brick ash as an additive material to improve clay properties in term of reducing its shrinkage feature. A certain amount of brick ash were mixed to clay soil and lime also were two added as a companion of a stabilizing agent. Some variation properties of two additive materials were applied in the sample of UCS and CBR tests. The effect of curing and soaking time was also be checked in term of UCS and CBR value changed. Based on properties tests, the clay soil classified standard. The mixture of 80% clay + 10% lime + 10% brick ash, in OMC condition, has the maximum of UCS and CBR laboratory test value. Curing and soaking time also has a significant contribution in increasing UCS and CBR value. The maximum value of both tests was reached at day 7th of curing and soaking time.Keywords : Clay, Swelling, Stabilization, Lime, Brick ash, Soil bearing capacity
Kultivasi Mikroalga Menggunakan Media Af6 Berdasarkan Perbedaan Volume Solution A Media Af6 Febrina Adelina Sigalingging; Padil Padil; Sri Rezeki Muria
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

Microalgae are microscopic plant organisms that live in waters. Nutrition is one of the important factors for the growth of microalgae. Optimization of nutrition is expected to increase the growth of microalgae. In cultivating laboratory scale microalgae, AF6 media is used as a source of nutrition. One stock of AF6 media material is solution A contains lots of nitrogen. This research purpose for determining the effect of the difference in volume of AF6 media solution A on growth rate and doubling time of various microalgae cultivated in AF6 media. In this research observations of cell density microalgae Chlorella sp. (6) and Chlamydomonas sp. (4, 5, 19, chl) on the volume of solution A media AF6 2, 3 and 4 ml were carried out by UV-VIS spectrophotometer with a wavelength of 680 nm. The results showed that specific growth rate highest and shortest doubling time occurs on the addition of a volume of 4 ml of solution A AF6 media. Microalgae that have a highest specific growth rate and shortest doubling time are Chlamydomonas sp. Microalgae. (19) 0.91/day and 0.75/day, respectively. Therefore, microalgae Chlamydomonas sp. (19) can be cultivated on a commercial scale to be processed into the products we want.Keywords: lipids, microalgae, AF6 media, optical density, solution A
Analisa Dampak Distributed Generation (DG) Dalam Perhitungan Drop Tegangan Pada Jaringan Distribusi Muhammad Septian Dwi Cahyo; Azriyenni Azhari Zakri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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Abstract

The power plant is a long way from the center of the load, and this results in considerable power losses and electrical voltage on the distribution of electrical power. This loss is caused by a long electrical transmission line and the type of conductor used. In the distribution of electrical energy through transmission and distribution, a voltage drop will take place throughout the line. This study will evaluate the magnitude of the voltage drop that occurs at the Jendral Sudirman feeder in Pekanbaru, Riau. There are several methods that can be made to improve the voltage drop. So this study will use the Distributed Generation (DG) installation method in the distribution network. In the initial data collection, the voltage drop on the feeder was 18.657 kV, equivalent to 6.72%. The voltage drop value exceeded the PLN standard, which was 5% of the nominal voltage. To improve the voltage drop in DG pair on the distribution network on the general Sudirman road feeder of 19.893 kV. Finally, from the analysis obtained the value of the voltage drop becomes reduced from before the installation of DG with the DG installed. The value of the voltage drop produced is far better at 0.53%, and this value has met the standard PLN that has been set.Keywords: Distributed Generation, Power Flow, Voltage Drop
Upgrading Crude Bio-Oil (CBO) Dari Biomassa Menjadi Upgrade Bio-Oil (UBO) Dengan Katalis Ni/Lempung Subangkit Julio Jaya; Syaiful Bahri; Edy Saputra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
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Objective of this research is to upgrade quality of bio-oil product from biomass of acacia. In this study several parameters were determined such us determine the effect of temperature reaction and ethanol : bio-oil ratio. And then compared physical and chemical characteristic of crude bio-oil (CBO) to upgraded bio-oil (UBO). In upgrading process, mixture of bio-oil and ethanol 36 gram, Ni/clay catalyst 0,3 gram, with variation of ethanol : bio-oil ratio are 5:1 (30 gram ethanol : 6 gram bio-oil), 3:1 (27:9) , 2:1 (24:12) and 1:1 (18:18) as well as temperature reaction variations are 60, 70 and 80 oC. The highest result on bio-oil yields 1:1 ratio and 60 oC was away 79,25% with calorific value increase from 3,784 into 18,339 MJ/kg. The dominant chemical components in crude bio-oil (CBO) such us aldehydes (58,91%), acids (13,43%) and esthers (12,26%) while in upgraded bio-oil (UBO) such us aldehydes (27,45%), phenols and furans (22,75%), alkanes and alkenes (19,48%), esthers (14,84%) and acids (1,53%) respectively. Keywords: bio-oil, upgrading bio-oil, crude bio-oil (CBO), upgraded bio-oil (UBO)
Prediksi Tingkat Kerusakan Portal Baja Bertingkat Berdasarkan Riwayat Waktu Gempa Pulau Sumatera Dengan Metode Backpropagation Neural Network (BPNN) Vindi Trisatria; Reni Suryanita; Ismeddiyanto Ismeddiyanto
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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Abstract

Indonesia one of the countries that prone to earthquakes which is tectonic and volcanic. Earthquake can damage a building, therefore the planning of earthquake resistant building is a requirement for an earthquake prone areas like in Indonesia and that planning must notice to the response of structure. One of the solution to predict the structural response and the damage level of multilevel steel portals is using the Artificial Neural Network (ANN). Thestructure model that author review is a multilevel steel portals which consisting of 3 models (5 levels, 10 levels and 15 levels). The structure is modeling with the finite element softwareand receives earthquake loads based on the time history of the Cape Mendocino earthquake that will be scaled on 10 capital of the provinces in Sumatera island. Artificial Neural Network(ANN) with backpropagation method is designed by using MATLAB program which is the input of this ANN is displacement, velocity and acceleration of three models that have beendesigned. The output that will be generated is damage level of the steel portal in the category of Safe, Immidiate Occupancy (IO), Life Safety (LS) or in conditions of Collapse Prevention(CP). Artificial neural network is trained by 8 earthquake data that owned by the capital of the provinces, and 2 remaining data from Padang City and Pekanbaru City that use forsimulation process. Based on the research, the model of artificial neural network has the potential accuracy to predict the damage level of structural between 90% -99%. From the result of simulation by ANN with 702 data from capital provinces of Padang and Pekanbaru City, 98,5% data could be predicted correctly by ANN. These results have shown that ANN is able to predict the damage level of multilevel steel portals in all of capital provinces in Sumatera Island.Keywords: multilevel steel portals, 3 structural model, structure response, time history, damage level, Artificial Neural Network.
Sistem High Rate Algae Reactor (HRAR) Untuk Menyisihkan BOD Pada Palm Oil Mill Effluent (POME) Vonny Meidina Rizani; Shinta Elystia; Sri Rezeki Muria
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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Abstract

In Indonesia, Palm Oil Mill Effluent (POME) treatment generally used open pond system, but this system cannot utilize nutrients properly. High Rate Algae Reactor (HRAR) system can be the solution of this problem. HRAR can increase the growth of microalgae and bacterial, while eliminating pollutants in wastewater. This research aim to investigate the effect of microalgae suspension concentration towards the removal efficiency of Biochemical Oxygen Demand (BOD). Based on the research results, 25% of microalgae suspension concentration showed the best removal efficiency of BOD, was 86,07%.Keywords: High Rate Algae Reactor (HRAR), Microalgae-Bacterial Consortium, Palm Oil Mill Effluent (POME), Biochemical Oxygen Demand (BOD),
Analisis Perencanaan Bendung (Studi Kasus Bendung Botung) Sadewa Sabihi; Manyuk Fauzi; Siswanto Siswanto
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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This research will discuss the analysis of the stability of the dam in the area Botung against weir botung in the area Botung it self actually has no weir bronjong but the dam is temporary and has damaged it needs to be made weir remains to be utilized in the long term, so it takes the design of the lighthouse and the pool megrim secure against rolling, sliding and piping. Based on the results of the discussion of final project study entitled "Analysis weir Planning Case of Studies weir Botung" it can be concluded, using data of rain 10 Years of 2005-2014 years gained 100 year flood discharge plan for, Q100= 16.617 m3/sec. High water levels in the upstream dam is 2,456 m, and the water level downstream of the weir is 0.673 m, while the weir height following the existing dam is not fixed in the amount of 1,35m. And the dimensions of the flood discharge obtained value Froude of 7.632, and been building an megrim type USBR of type III. Safety Factor Values sliding obtained a value of 1.74 ≥1.5 and qualify. Safety Factor Values rolling obtained a value of 2.10 ≥1.5 and qualify. Planning this dam safe against piping for WCR value of 4.145 which is secure against gravel and clay.Keywords: weir, Curved tile, stability of the dam, rolling, sliding and piping
Fenomena Hidrolis Pada Pintu Sorong Fahmiahsan, Rosyadah; Mudjiatko, Mudjiatko; Rinaldi, Rinaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Abstract

The sluice gate is a hydraulic structure that used for controlling the discharge on dam or irrigation canal. Their discharge coefficient depends on geometric and hydraulic parameters. Swamee (1992) presents two formulas for calculating the discharge coefficient (Cd) for free flow and submerged flow based on Henry’s Curve (1950). Laboratory models used to find out the flow phenomenon that was formed due to a difference in the edge shape of the sluice gate and increased gate base. The simulation done by varying the height of the gate opening (a) and the discharge (Q). The results of the study obtained the length of water jumps (Lj) formed on the sluice gate with edge 450 is longer than the sluice gate with edge 900. The discharge coefficient (Cd) value on the sluice gate with edge 450 is higher than the discharge coefficient (Cd) value on the gate with edge 900. The energy loss trendline (ΔE) obtained shows the value of ΔE increases with increasing h2/h1. The value of the critical flow coefficient range (Ckr) on the sluice gate with edge 450 and 900 increases with the increase in base height. The results of this study also add to the long trendline of previous research that has been done by Klaas (2009).Keywords: Discharge Coefficient, Energy Loss, Hydraulic Jump, Sluice Gate

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