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Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
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Articles 3,145 Documents
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Analisis Performa Alat Planishing Hammer Melalui Metode Elemen Hingga Dan Eksperimen Sugianto, Irwan; Afrizal, Efi; Arief, Dodi Sofyan
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Planishing hammer is a tool for plate forming with a utilizing impact force that happened as a result of hammer’s impact. This research was conducted to find the performance of planishing hammer, then do some methods to get value of force that happened. As for the method used are manual calculation, experimental, and simulation. Simulation method was done by Finite Element Method (FEM) concept using commercial software, collusion Abaqus. The experiment performed with metal formed to plate, where at planishing hammer pasted a strain gauge that activated by microcontroller and used Arduino UNO which can be connected directly to a computer to see the stress that happened to hammer. The experiment was conducted to get the maximum force of forwarded from electric motor ¼ HP with principle of power transmission utilizing eccentric shaft for until the plate is deformed. For manual calculation was used mechanism 4 bars, wherein the linear velocity were calculated by analytic methods. Based manual calculation method, the value of  force 2413.86735 N. By experimental method thrice, the value of force are 2748.081 N,  2775.518 N and 2742.478 N, and with simulation the value of force is 2165.961 N. Keywords: Plate, Software, Strain Gauge, Maximum force, Deformation
Kaji Eksperimental Variasi Jarak Turbin Angin Venturi Dengan Turbin Angin Propeler Terhadap Performa Hybrid Wind Turbine Eldhy Susetio; Iwan Kurniawan
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 hybrid wind turbine in this study is a horizontal axis wind turbine, whichcombining of two different wind turbines.A turbine propeller shaft is 2 m in diameter with blade profiles of S833 and ball wind energy (venturi turbine) of 0.5 meters by the number blade of 5 pieces. Venturi turbine is placed in front of the propeller turbine. This study varying the distance between the rear hub of Venturi turbine by propeller turbine hub is 5 cm, 10 cm and 15 cm. Testing begins with collecting data on the turbine propeller, then performed the retrieval of data from the merger of Venturi turbine with turbine propeller hub by varying the distance between the two turbines. This study suggests that the addition of Venturi wind turbine in front of the propeller wind turbine produces round and a higher power than the wind turbine propellers without Venturi wind turbine in front of it. The addition of the power generated in the generator's turbine hybrid that a distance of 5 cm power generators will increase the amount of 12.7%, while at a distance of 10 cm power generator increases the amount of 28.5%, and the last on the addition of 15 cm distance power generators increased 34.3% magnitude. Keywords: Hybrid wind turbine, Venturi turbine, turbine propeller
Pemetaan Sebaran Tempat Pembuangan Sampah (TPS) Ilegal Di Wilayah Pengembangan I Kota Pekanbaru Medio Novindra Putra Bayu; Jecky Asmura; 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

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Abstract

Pekanbaru City as one of the metropolitan cities with a population of 1,064,566 people can produce 450,000 kg of daily waste in 2016 to be processed at the Muara Fajar TPA. The Development Area (WP) I which consists of Limapuluh, Senapelan, Sail, Sukajadi Districts, Pekanbaru City and has a total population of 175,666 inhabitants with a total area of 19.97 Km2. The high population and waste generated needs to be balanced with an adequate waste management system to avoid the formation of Illegal TPS. The purpose of this study is to map and measure TPS volumes and to analyze geophysical, anthropogenic and community characteristics by distributing questionnaires and conducting interviews. This research was conducted by conducting a direct visit to the study area with the help of the Garmin 60CSx GPS, the results of the review were then mapped with the ArcMap 10.3 application. The results of the field survey were obtained as many as 16 illegal TPS points in WP I with a total garbage volume measured of 58,514 m3. The existence factor of the river does not affect the emergence of Illegal TPS. For the type of land, it was concluded that vacant land is the most potential place for Illegal TPS, for the most potent type of road is the type of local road, the level of education and knowledge will influence attitudes and behavior of waste management, because the low level of education and lack of knowledge will increase attitudes and unhealthy behavior. The number of illegal dumping increases with the increasing number of respondents with other types of work or unemployment.Keyword: Geographic Information System (GIS) Illegal Dumping, ArcMAP, Mapping Ilegall Dumping
Aktivitas Fotodegradasi Fenol Dengan Variasi Suhu Degradasi Menggunakan Komposit Tio2-Cnt(Cocopas) Nadhia Gasani Putri; Desi Heltina; Panca Setia Utama
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
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Abstract

Phenols found in the wastewater of some industries have acute toxicity. The photocatalysis process can be used to degrade organic compounds such as phenols. To increase the photocatalytic activity of TiO2, a composite formation was formed between TiO2 and carbon nanotubes (CNT). Before being composited, CNT dispersion was carried out using cocoPAS surfactant as dispersing agent. The purpose of this study is to determine the effect of degradation temperature on phenol degradation. The process of making TiO2-CNT(cocoPAS) composites begins by dispersing CNT with cocoPAS surfactants and then composite with TiO2. Photocatalytic activity of the TiO2-CNT(cocoPAS) composite was tested at an initial phenol concentration of 30 ppm with variation of degradation temperature of 30,40 and 50ºC for 4 hours under UV light. Morphology of TiO2-CNT(cocoPAS) composites were characterized using SEM and phenol concentrations were characterized using a UV-Vis spectrophotometer. The highest degradation of phenols by TiO2-CNT(cocoPAS) composites at the initial phenol concentration of 30 ppm was at the degradation temperature of 50ºC, which was 35.59%.Keywords : photocatalysis, composite, TiO2, CNT, cocoPAS, phenol, temperature
Degradasi Karet Alam Menggunakan Katalis CoCl2 Dengan Variasi Waktu Reaksi Ivan Fadhillah; Said Zul Amraini; Bahruddin Bahruddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
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Abstract

Liquid Natural Rubber (LNR) is a product of natural rubber latex depolymerization process whose molecular weight specifications are influenced by several factors. Two of them are CoCl2 catalyst content and depolymerization reaction time. This study aims to synthesize Liquid Natural Rubber (LNR) from Latex Natural Rubber and determine the effect of variations in the addition of CoCl2 catalyst levels and reaction time to the molecular weight of the resulting LNR. The first treatment in this study had several stages, namely the preparation of raw materials including dilution of natural rubber latex resulting from cutting of rubber trees into natural rubber latex with dry rubber content (DRC) 20%. After that, the process of depolymerization was continued with the help of a CoCl2 catalyst which varied the levels of CoCl2 1 phr, reaction times 7, 8 and 9 hours, stirring speed of 250 rpm and stirring temperature of 70 ºC. The final stage of LNR purification was using methanol, toluene and oven at a temperature of 70ºC. The LNR products obtained are liquid and semi-gel. The formed LNR has functional groups and structures that conform to the LNR formation specifications. While the Mn LNR molecular weight value with a variation of ,reaction time, did not experience a significant difference for each additional reaction time.Keywords : liquid natural rubber, gel permeation chromatography, cobalt dichlorite, depolymerization and dried rubber crumb.
Characteristic Soils "Soap" At Site Project Of Pekanbaru Mayor's Office Joshua, Norman; Fatnanta, Ferry; Nugroho, S A
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
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Soil characteristic in field did not always meet specifications in planning to carrying out construction works . A good construction such as roads, buildings , and other construction will be able to last long if its supported by a good foundation soil ( Hartosukma , 2005) . One of the site project of Pekanbaru, there are soils are fragile when seen by direct eyes and can cause problems in the construction field. Therefore , the research would take up to study the characteristics of soils “soap” at the site project of Pekanbaru Mayor’s Office Development through the physical and mechanical properties of the soil type .Keywords: “ Soap ” Soils, Characteristics, Pekanbaru
Sintesis Biodiesel Dari Minyak Nyamplung (Calophyllum Inophyllum) Menggunakan Katalis Geopolimer: Pengaruh Konsentrasi Katalis Dan Rasio Mol Minyak:Metanol Sugesti, Heni; Saputra, Edy; Helwani, Zuchra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Biodiesel is a product of transesterification reaction fat/oil and methanol with the aid of catalyst. Catalysts is commonly used in the production of biodiesel is strong base catalysts such as NaOH and KOH which is difficult to separate from the product of the reaction because it has the same phase as the reactant. Therefore, it is necessary to develop catalyst technology in order to get the production process becomes more economical, applicable and environmentally friendly, one of the catalyst is geopolymer. Geopolymers are synthesized by reacting potassium silicate, metakaolin, and bottom ash. Geopolymers is used in transesterification reaction. The process variables are weight of oil 50 grams, stirring rate 400 rpm, reaction time 120 minutes, and temperature of 65 oC, with catalyst 2% (w/w) and mole ratio of methanol:oil 1:12. The yield of biodiesel 96.62% with density 878.3 kg/m3, viscosity 4.395 mm2/s, the acid number of 0.3575 mg-KOH/g biodiesel and the flash point 134.25 °C comply with the SNI standards (SNI 7182: 2015).Keywords: biodiesel, calophyllum inophyllum oil, geopolymer, transesterification, yield
Analisis Pengaruh Bentuk Mata Tool Punch Terhadap Gaya Dan Kualitas Pemotongan Pada Proses Blanking Lubis, Fahri Asrizal; Yohanes, Yohanes
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Abstract

presses (punch) and mold (dies). In the process of blanking the shape of the workpiece (product) that is produced is round in the form of slabs, this form is the simplest easily measured and observed. Burr (sharpangle on the cutting edge of the sheet) is one of the characteristics of the results of cutting on the part of the workpiece (product) formed in the blanking process, these characteristics are influenced by the type of material,clearance dies, sharpness and shape of the eye tool punch. There are three criteria for failing or safe burr formation, which are categorized as good judgments if the burr height is very small, categorized as mediumrating if the height of burr approaches the limiting curve but still in the area of the safe curve, it is categorized as bad if the height of the burr is very large. In this study the blanking process uses mild steel plates with a platethickness of 1.5 mm. The punch tool used is four, namely the punch tool A, B, C, and D. The tool punch materialuses HSS with a diameter of 16 mm while for dies using AISI 4340. The clearance dies used is 0,09 mm. From the results of the research that has been done, it can be concluded that the blanking process using the punch tool requires a working pressure of 115 bar with the smallest burr height of 0,12 mm and the largest of 0,47 mm. The blanking process using the punch B tool requires a working pressure of 50 bar with the smallest burrheight of 0,10 mm, and the largest of 0,24 mm. The blanking process using the punch C tool requires a working pressure of 119 bar with the smallest burr height of 0,55 mm and the largest of 0,75 mm. The blanking processusing the punch D tool requires a working pressure of 60 bar with the smallest burr height of 0,15 mm and the largest of 0,36 mm.Keywords: Blanking Process, Tool Punch, Dies, Burr
Pembuatan Grease Dari Minyak Jelantah: Pengaruh Nisbah Mol LiOHNaOH Dan Nisbah Base Oil-Thickening Agent Terhadap Karakteristik Grease Rizky Sandy Harahap; Irdoni Irdoni; Bahruddin Bahruddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
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Greases are used between rubbing metal surfaces to reduce friction. The utilized base oil could be vegetable oir or mineral oil. The objective of this research are to produce greasefrom waste cooking oil and to study the LiOH-NaOH ratio and base oil effect to grease characteristics. Grease-making methods comprised base oil (waste cooking oil) preparation, saponification to made thickening agent, and blending process with stirring speed 650 rpm among thickening agent, base oil and additive for the grease-making. The variations used were LiOH-NaOH ratio (90:10; 80:20; 70:30) and base oil:thickening agent ratio (75:20; 77,5:17,5; 80:15; 82,5:12,5; 85:10). The test methods conducted were penetration test ASTMD217 for grease consistency and dropping point ASTM D566. The best grease obtained belong to grease specification and performance parameter for NLGI grade A quality levelwith thickening agent formulation LiOH:NaOH ratio 90:10 and grease formulation base oil:thickening agent ratio 75:20 with penetration 227 (0,1 mm), NLGI number 3 (25 oC) anddropping point 139 oC.Keyword : dropping point test, grease, penetration test, waste cooking oil.
Pembuatan Bioetanol Dari Nira Nipah Menggunakan Bakteri Zymomonas Mobilis Dengan Variasi Pemekatan Medium Dan Waktu Fermentasi Wahyu Mey Riswanto; Silvia Reni Yenti; Chairul Chairul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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The existence of Nypa palm is abundant in Riau province. Nypa can potentially supply biofuels because Its sap has a sugar content of 15-20% which can be converted into bioethanol. Bioethanol is ethanol produced from raw materials containing starch, sugar and cellulose through a process of fermentation and distillation that can be used as an alternative fuel which is environmentally friendly and renewable. To be Able to produce bioethanol from nypa sap in a laboratory scale, it is necessary to study the manufacture of bioethanol from nypa sap through fermentation by using Zymomonas mobilis fermentation medium volume of 2 liters. The objective of the research is to convert the sugar in the nypa sap through fermentation into bioethanol and to observe the effect of concentration medium of the juice in the fermentation and fermentation time on bioethanol production using Zymomonas mobilis. Through the process of fermentation using Zymomonas mobilis, glucose is converted into ethanol and carbon dioxide. Preparation starter was made with yeast inoculum process Zymomonas mobilis at 10% of the fermentation medium, therefore it can be adaptable and ready for fermentation. Fermentation takes place in batches with a volume of 2 liters of fermentation medium, concentration variations sap by evaporation at 10; 20; 30% (v/v) as well as variations in the fermentation time of 12; 24; 36; 48; 60; 72 and 84 hours. Temperature fermentation at room temperatur is 25 – 30oC. Ethanol concentration was Analyzed by using Gas Chromatography. Optimum conditions of bioethanol production from Nypa Sap were shown having 30% concentrated medium variation, and fermentation hours 60th about 15,164 % (v/v) or 111,689 mg/ml.Keywords: bioethanol, concentrated, nypa Sap, zymomonas mobilis

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