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
 205   206   207   208   209 
Perancangan Antena Smartphone Mimo 8X8 Multi Layer Untuk Jaringan Komunikasi Nirkabel 5G Franatha, Vickri Wira; Rahayu, Yusnita
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

Currently, research on MIMO microstrip antennas to support fifth generation (5G) technology is increasing. This is because high data rate is required. A 28 GHz frequency is one of the mobile allocation frequencies approved by the Federal Communication Commission (FCC). In this research, Multiple Input Multiple Output (MIMO) 8x8 smartphone antenna working on 28 GHz using Computer Simulation Technology (CST) Microwave Studio simulation software is designed. The antenna is designed with 4 layers of the same substrate using aperture coupled technique. The aperture coupled technique allows the antenna to generate large bandwidth. Based on simulation result data, This antenna gives the result of parameter simulation values such as bandwidth impedance 2.38 GHz (8.5%), return loss -45.912 dB, Voltage Standing Wave Ratio (VSWR) 1.01 and gain 12.5 dB at 28 GHz. The design of antenna is expected to be applied at mobile smartphones and work on millimeterwave mobile communications systems in the future.Keywords: MIMO, Aperture Coupled, Milimeterwave
Pengaruh Variasi Volume Konsentrasi Bakteri Bacillus Subtilis Terhadap Sifat Fisik Beton Fajar Priandoko; Zulfikar Djauhari; Enno Yuniarto
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

In general, construction in Indonesia still uses concrete as a building material. It is proven by more than 60% of projects in Indonesia were using concrete as its construction material. Starts from the simplest constructions to the complex technology projects, concrete becomes an inevitable need. Concrete has several advantages and disadvantages. The problem that often occurs in concrete is it can crack either due to physical changes from the concrete itself or external influences. One way to solve this problem is to use the Bacillus Subtilis bacterium as a concrete mixture. This bacterium is capable of repairing cracks in concrete. That is why this research will use BacillusSubtilis bacteria with different variations in volume concentration, it will be 105 cells / 20 ml, 105 cells / 25 ml and 105 cells / 30 ml as much as 25 ml in castings of 0.1 m3. This research will investigate the physical properties of concrete, which are workability, porosity, and shrinkage of concrete. The test objects are cylindrical and soaked in normal water for 28 days and 56 days. The workability test results showed the highest slump value obtained in bacterial concrete with a concentration of 105 cells / 30 ml with a slumpvalue of 12 cm. The lowest porosity values of 28 and 56 days ages were obtained in bacterial concrete concentrations of 105 cells / 20 ml with porosity values of 12.83% and 10.31%, respectively. The concrete bacteria concentration of 105 cells / 20 ml also has the smallest shrinkage value of 0.064 mm. The addition of Bacillus Subtilis bacteria witha concentration of 105 cells / 20 ml was the most optimal of all variations of theconcentration used to the physical properties test of concrete.Keywords: Concrete, Volume Concentration, Bacillus Subtilis, Physical Properties
Pemurnian Bioetanol Hasil Fermentasi Nira Nipah Menggunakan Proses Destilasi-Adsorpsi Menggunakan Adsorben Silica Gel Shintia Oktaviani; Chairul Chairul; Silvia Reni Yenti
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

The rapid rate of world population growth conduces demand and supply of fuel is not balance. So that, energy reserves has been depleted in large numbers. Especially fossil fuels which is a main energy. The government has compiled program and policy for development of bioethanol and biodiesel to resolve energy crisis in indonesia which targeted in 2025 can be approximately 15-20% fuels need to fulfill transportation sector and the national industry. This research aims to produce bioethanol fuel grade-adsorption using distillation methods, determine the effect of the ratio of silica gel: bioethanol and height of the adsorbent in the column for producing bioethanol fuel grade. The raw material is bioethanol from nipa sap fermentation results with 13% ethanol content. Ethanol content obtained not too high previously, so that should be took a process that can be increase the purity of bioethanol with distillation process-adsorption. This research divided into two stages. First stage is nipa sap bioethanol distiled up to 96% concentration and second stage is distillation-adsorption using silica gel adsorbent. Independent variables on this research is ratio of silica gel : bioethanol and height of adsorbent in the adsorption column. The most influence process to review bioethanol purification is distillation-adsorption silica gel with ratio: ethanol 1:2 and a height of adsorbent in the column is 3.5 cm with purity of 99,6% and had been categorized fuel grade bioethanol.Keywords: Silica gel, bioethanol, bioethanol fuel grade, nypa, distillation adsorption process
Analisis Kerusakan Mesin CNC Milling Menggunakan Metode Fault Tree Analysis (FTA) Dan Failure Mode And Effect Analysis (FMEA) (Studi Kasus Mesin CNC Milling Di Lab. Jurusan Teknik Mesin, Universitas Riau) Saputra, Rio Agus; Susilawati, Anita
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

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

Abstract

The CNC machines are computer-controlled machines using numeric codes, symbols and letters as command data. A CNC Milling machine at the Mechanical Engineering Laboratory of the University of Riau has damaged and disrupted engine performance. The purpose of this study is to determine the types of damage, causes, and efforts and suggestions of actions that can be done to improve engine performance for CNC milling in Riau University Laboratory. The method is used in this research of the Fault Tree Analysis (FTA) method which is used to find the caused of the damage to the basic event and Failure Mode and Effect Analysis (FMEA) that is used to search priority problem through Risk Priority Number (RPN). The result showed damaged of components such as pneumatic cylinders of protective door, ATC pneumatic brauer units, pneumatic valves and saddle. The result of critical component analysis of leakage on pneumatic valve component was the most critical risk with RPN of 448. The actions to reduce the highest of RPN were repairing, prevention and maintenance on the CNC milling machine. Proposed repair was the replacement of components that have been damaged and optimize the precautions and maintenance in accordance with the instructions in the manual book.Keyword: FTA, FMEA, RPN, CNC Milling machine
Pengaruh Kuat Arus Dan Waktu Kontak Pada Proses Elektrokoagulasi Menggunakan Sel Al-Al Dengan Ketebalan 1 mm Untuk Penyisihan TDS Dari Limbah Cair Lumpur Bor Apriyanto, Apriyanto; Daud, Syarfi; MS, Edward HS
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

Liquid waste of the drilling mud is a waste that requires processing before it is released into the environment. Direct discharges to the environment especially to river may cause a risk in the water. Electrocoagulation is one of the alternative methods for wastewater treatment. Electrocoagulation is an electrochemical method for water treatment where on the anode occur the release of active coagulant in the form of metal ions while on the cathode electrolysis reaction occurs which release of hydrogen gas. In this electrocoagulation research the sample use liquid waste of drilling mud PT CPI Duri with TDS value 12.390-14.910 mg/L and pH 7,37-7,98. The research was conducted by batch systems. The electrode that used is Aluminum with size 20 cm x 10 cm x 1 mm. The variations used are electric currents (1, 2, 3, 4, 5 A) and contact time (15, 30, 45, 60, 75 min). Result of the research with treatment of contact time 45 minutes and the electric current of 5 A is the most effective treatment to reduce TDS from 14.800 mg/L to be 10.490 mg/L or reduce by 29,12% and the highest pH increase from 7,38 to be 8,76 or increase by 18,7% at treatment with a contact time of 75 minutes and the electric current of 4 A.Key words : Electrocoagulation, TDS, Aluminium Electroda, Batch System.
Kinerja Teknik Pengomposan Limbah Tandan Kosong Sawit Menggunakan Metode Windrow Aerob Ditinjau Dari Rasio C/N Adinda Ryvania Abrir; Adrianto Ahmad; David Andrio
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

The palm oil industry is currently experiencing very rapid development which is marked by the increase of CPO production resulting the increase of waste product. The main solid waste from the palm oil industry is Empty Fruit Bunch (EFB) that contains high organic matter which has an impact on environmental pollution if not handled well. The composting process is one of the alternative method to reducing environmental pollution caused by waste EFB. However, the composting process takes a long time. Therefore, it is important to do a breakthrough to speed up the processing time. In this research, EFB composting process is done by adding a mixed culture that is useful as a starter and POME as a nutrition source. The purpose of this research was to determine the effect of adding POME toward C/N ratio in the windrow aerob composting. In composting process takes place with variations by adding POME 0%, 20%, 30%, and 40%. Treatment with addition of 30% POME showed the best result with the value of C/N ratio was 11.66 with a pH of 6.98, a temperature of 32.33C and a moisture content of 40.6%. with 25 days period of time. The conclusion of this research is that the addition of POME has an effect on reducing the C/N ratio and accelerating composting time.Keywords: Composting Process, C/N Ratio, Empty Fruit Bunch, Palm Oil MillEffluent (POME), Windrow
Pembuatan Bahan Bakar Padat Dari Pelepah Sawit Menggunakan Proses Torefaksi Pada Variasi Suhu Waktu Torefaksi Rina Maryenti; Komalasari Komalasari; Zuchra Helwani
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

Oil Palm Fronds can be used as alternative energy source by using torrefaction process. Oil Palm Fronds has a calorific value of 15439.39 kJ/kg. The calorific value can be increased by torrefaction. Torrefaction is a pre-treatment process of biomass into solid fuel within temperature range of 200 - 300 oC in an inert condition. This research aims to produce solid fuel from oil palm fronds and study the effect of variation in temperature and time torrefaction towards characteristic of solid fuel resulted. Torrefaction of oil palm fronds was using fixed bed horizontal reactor at temperature of 250 - 300 oC and time of 20 - 40 minutes. Product quality resulted was calorific value, mass yield, energy yield and proximate. The result obtained for calorific value in range was 18152.26 - 24060.32 kJ/kg, mass yield was 45.22 - 75.04 %, and energy yield was 70.49 - 88.23 %. Proximate analysis resulted in the form of moisture content was 3.42 - 5.44 %, ash content was 4.67 - 6.89 %, volatile content was 38.63 - 65.34 %, and fixed carbon was 24.55 - 51.06 %.Keywords: calorific value, energy yield, mass yield, oil palm fronds,torrefaction.
Karakteristik Tegangan Tembus Arus Bolak Balik Pada Minyak Jarak Pagar (Jatropha curcas) Sebagai Alternatif Isolasi Cair Rendy Kamerlisa Putra; Fri Murdiya
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

Oil insulation generally use mineral oil because it has good heat absorption and dielectric characteristics as an insulator. Because of mineral oil is less friendly environmental, so important to find a solution to overcome them. This research aims to determine the feasibility of Jatropha curcas oil as an alternative oil insulation. This study has used variations of gap and water content to determine the effect on the breakdown voltage. The test result of the breakdown voltage of Jatropha curcas oil is compared to the breakdown voltage of the Shell Diala S2 ZU-1 oil. Futhermore the final result is found that the average of the breakdown voltage of Jatropha curcas is higher than Shell Diala S2 ZU-1 oil. The end of this study has achieved average values of breakdown voltage with lesser water concentration i.e. 2,17 %, 1,96%, 1,86%, etc. Prerequirements of the oil insulation must be agreed with the following standards i.e SPLN 49-91: 1982 and IEC 60296-2003. It’s explained that water concentrationt must fulfilled less than 3% (30 mg/kg). In this research Jatropha curcas oil have water concentration which complied to IEC 60296-2003 standard. SPLN 49-91: 1982 has declared that oil insulation must require the value of flash point ≥ 140°C, viscosity ≤ 40 cSt, pour point ≤ -30 °C, and density ≥ 0,859 gr/cm3. The result from this research should be fulfilled the caracteristic of breakdown voltage, flash point and water concentration that Jatropha curcas oil.Keywords: Oil insulation,breakdown voltage, jatropha oil.
Isoterm Dan Termodinamika Adsorpsi Pada Methylene Blue Menggunakan Hidroksiapatit Dian Novita Rahmawaty; Yelmida Azis; Cory Dian Alfarisi
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

The adsorption model was carried out to find out the appropriate adsorption mechanism in the methylene blue adsorption process using hydroxyapatite. The aim of this study was todetermine the equilibrium time, the effects of methylene blue’s initial concentration, adsorption temperatures and the adsorption models. Analysis was conducted by spectrophotometric method, then tested on the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (DRK) isotherm model. The result showed that the best initial concentration of methylene blue for adsorption temperature 30℃ with adsorption capacity 2,090 mg/g and 41,79% of removal efficiency. The adsorption followed the Freundlich isotherm model. Thethermodynamic parameters (ΔH = -8,4 kJ/mol, ΔG < 0 dan ΔS = -80,70 J/mol K) indicated that he adsorption process was a physically and spontaneously excothermic reaction.Keywords: adsorption, Freundlich, hydroxyapatite, isotherm, methylene blue.
Pemanfaatan Logam Aluminium (Al) Pada Kaleng Minuman Soda Menjadi Tawas Loisa Rosalia Sitompul; Elvi Yenie; Shinta Elystia
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

The waste problem in Indonesia is a very complex issue. The example of waste that have huge amount of quantities is beverages cans. Waste cans can be reduced by utilizing from recycle the aluminum content to be the main material of potassium alum (KAI (SO4) 2.12H2O). In this study used carbonated drinks. The concentration of aluminium in soda cans is 84%, the concetration can be determined using Atomic Absorption Spectrophotometry (ASS). The variables used in this study is variation of KOH concentration whitin 20%, 30%, and 40% and the variation of H2SO4 concentration whitin 6M, 8M, and 10 M. From the results of this study showed optimum yield is 98.52% occurred at a concentration of 40% KOH and H2SO4 8M. Characteristic of this alum is having insoluble part in water of 0% and 5.39% aluminium in alum.Keywords : Cans, potassium alum

Page 207 of 315 | Total Record : 3145

 205   206   207   208   209 

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