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181	Engineering	ABS-123
PRELIMINARY STUDY OF THE BEST VARIABLES USING SURFACTANT SLS IN EOR APPLICATION WITH CRUDE OIL LEDOK Edi Untoro1* and Slamet Priyanto2 1Ministry of Energy and Mineral Resources Education and Training Agency (ESDM) Akamigas Cepu Mineral Energy Polytec hnic (PEM), Cepu, Central Java, Indonesia 2Department of Chemical Engineering, Faculty of Engineering, Diponegoro University, Semarang, Central Java, 50275, Indonesia. Abstract The demand for fuel oil in various industries, households, vehicles is increasing. This has resulted in decreased petroleum production in line with the decline in oil reserves in Indonesia. Therefore, Enhanced Oil Recovery (EOR) technology is needed to maximize old wells with large oil reserves, for example in the Ledok oil well, Cepu, Central Java, Indonesia. The purpose of this study was to study the best variables in the manufacture of surfactants from pulp-paper industrial waste in the form of black liquor. From the oil wells in Ledok-Cepu, crude oil and natural formation water were carried out. After that the SLS surfactant obtained was carried out by a qualitative FTIR test and its potential on the core flooding EOR, the results showed that the surfactants tested for compatibility with natural formation water met the requirements as surfactants for EOR. In qualitative analysis, FTIR shows the presence of sulfonate groups and ether groups in the surfactant, that the sulfonation reaction has gone well as a surfactant for EOR. After that, the core flooding test was carried out by injecting oil, brine, and surfactants, the best yield was with a formation water concentration of 5,000 ppm with a yield of 79 percent, and IFT reached 10^-1 dyne cm. Keywords: SLS surfactant- SLS potential- Core Flooding- Enhanced Oil Recovery (EOR) Share Link | Plain Format | Corresponding Author (Edi Untoro)

182	Engineering	ABS-383
modeling of automatic transmission control systems on LPG vehicles Suroto Munahar, Muji Setiyo, Bagiyo Condro Purnomo Muhammadiyah University of Magelang Abstract Currently, vehicles with the concept of bi-fuel (gasoline / LPG) are being developed. Given this concept offers many advantages, including higher efficiency, lower emissions and high octane content. However, the application of bi-fuel vehicles has many problems, especially in the automatic transmission control system. This happens because LPG / gasoline has different characteristics. LPG combustion engines have a longer flame propagation speed than gasoline. This condition causes the energy response generated to be slower. In addition, the current automatic transmission control system has not been able to read the angle of the road so that, in many cases the engine suddenly turns off when climbing because the system is not able to read road conditions. Because of this, this study develops an automatic transmission control system model for LPG vehicles that can adjust the angle of the road. The method applied is using a fuzzy logic controller (FLC). The simulation results show that the control system is able to adjust the characteristics of LPG and the angle of the road. In conclusion, the model made is very promising to be implemented in real vehicles. Keywords: LPG, automatic transmission, control systems, gasoline Share Link | Plain Format | Corresponding Author (suroto munahar)

183	Engineering	ABS-128
Development of Indonesian Well Head Generation Unit (Small Scale) Based on Regulation and Law in The PT. Geo Dipa Unit Dieng Case Study Akhmad Sofyan (a), Hari Sumantri Aka (a), Ade Maulana Rizaldy (a), Bambang Yudho Suranta (a) a) Politeknik Energi dan Mineral Akamigas Cepu Jalan Gajah Mada no. 38 Cepu Kab. Blora Jawa Tengah 58315 www.akamigas.ac.id Abstract Geothermal energy is one of the environmental friendly energy to generate electricity. Heat energy in the form of steam and hot water that existed inside the earth is flowed to the surface and goes into production and generator facilities to generate electrical energy. Currently, there are many types of electricity generation for geothermal, such as separated cycle, single flash, binary cycle and combined cycle. These types of generators are power plants with a capacity of 65-110 MWe and require a large area, many wells, large facilities and of course large capital. However, there are types of power plants that can be developed in a fast time, namely Wellhead Generating Unit. In the manufacture of a Wellhead Generating Unit, steam is extracted from the well and converted to electricity at the wellhead. This type of generator can produce electricity in relatively short time and simpler equipment. Indonesia has only one example of developing a Wellhead Generating Unit (Small Scale) in the PLTP PT. Geo Dipa Energi Dieng with a capacity of 10 MWe. In addition, the following are some of the regulations governing geothermal energy in Indonesia, namely Law No. 21 of 2014 concerning Geothermal Energy, Presidential Regulation No. 3 of 2016 concerning the Acceleration of the Implementation of National Strategic Projects, Government Regulation No. 7/2017 concerning Geothermal Energy for Indirect Use, the aspect of land clearing is regulated in Law number 4/2009 concerning Minerba. The sale and purchase agreement is regulated in the Minister of Energy and Mineral Resources Regulation Number 10 of 2017 and environmental impact is regulated in the Government Regulation of the Republic of Indonesia Number 27 of 1999 concerning Environmental Impact Analysis. Enacted on May 7, 1999. From the above legislation, the Wellhead Generating Unit (Small Scale) is the same as an ordinary conventional generator, but what distinguishes only the capacity generated by this generator. Keywords: Geothermal Energy- Well Head Generating Unit- Law- Presidential Regulation- Government Regulation Share Link | Plain Format | Corresponding Author (Akhmad Sofyan)

184	Engineering	ABS-129
RIG TIME REDUCTION DURING KICK HANDLING OPERATION IN EXPLORATION WELL X BY APPLYING DRILLERS METHOD Bambang Yudho Suranta(a), Akhmad Sofyan(a), Didin Chaerudin Irwansyah(a) PEM AKAMIGAS Abstract This journal will describe on how the kick handling time is reduced from the actual condition by applying Drillers Method in Well X. This well is an exploration well with the main objective at the 9,000 ft range of depth in Kujung Formation, which has been identified as a gas hydrocarbon reservoir zone. Before reaching the total depth, the drilling operation involves four kick occurrences. This Kick happened for the last time at the depth of 8,525 ft and it needed two times kill mud circulation to handle the kick. Furthermore, the time needed to control the kick was 13.5 hours by applying the Engineers Method. Moreover, even the well control operation was successfully done, Engineers Method may caused some serious problems since this method allows gas migration to the surface without expansion when the kill mud preparation needs longer time. Thus, this method is evaluated with the Drillers Method as the comparison, resulting the recommendation of well control method for Exploration Well X by considering the kick handling time, produced pressure, operational complexity, and hole problem aspect. Then the recommended well control method is simulated with Landmark software to predict the produced pressure during the well control operation in Exploration Well X. Through this recommendation, kick handling time in Exploration Well X is reduced to be 4.3 hours only with 69,493.39 USD of cost saving. Keywords: Kick, Well Control, Drillers Method, Engineers Method, Blowout Share Link | Plain Format | Corresponding Author (Bambang yudho Suranta)

185	Engineering	ABS-130
Design Of PV-Wind Turbine Mobile Container for Disaster Area Using HOMER, A Case study: Cepu - Central Java A Sahrin (a*) , E Utami(a), MA Fathoni(a) a) Politeknik Energi dan Mineral Akamigas Jl. Gajah Mada No.38 Cepu alfin.sahrin[at]esdm.go.id Abstract Abstract. This paper aims to design a system in the form of a PV (module) - Wind Turbine Mobile container for the first solution of the disaster area application in the Cepu city of Blora, Central Java. The solution given is to make a mobile container that can assemble a short time as an independent renewable energy source with the devices used to help supply energy and easy to move. The design use hybrid energy consist of PV (module), wind turbine, inverter, water pump, reverse osmosis, lighting, and charger facilities for communication equipment. In the design process using the HOMER (Hybrid Optimization of Multiple Energy Resources) software, it can design a system and simulate and determine the best system configuration. In this paper, model four configurations between the power capacity of the PV (module) and the wind turbine to obtain the optimal configuration. The simulation result show configuration of 1 proposed grid-connected with load profile load is 9267-watt using capacity PV (module) 250 WP and a wind turbine 1 kW, and this system is feasible to apply. Keywords: mobile container- disaster area- hybrid energy- Homer software Share Link | Plain Format | Corresponding Author (Alfin Sahrin)

186	Engineering	ABS-131
MECHANICAL PROPERTIES IDENTIFICATION OF VULCANIZED RUBBER BY USING MOONEY-RIVLIN METHOD Budi Setiyana, Rifky Ismail, S. Sugiyanto, J. Jamari Mechanical Engineering Department, Faculty of Engineering, University of Diponegoro, Jl. Prof. Soedharto SH, Kampus Tembalang, Semarang 50275 Abstract Identification of the mechanical properties of rubber is important to predict its performance. Due to hyper-elastic and nonlinear properties of rubber behavior, identification of its mechanical properties is more difficult than on metals. The mechanical properties of rubber are often expressed as a Strain Energy Function (SEF). Mechanical properties identification to obtain the SEF data is studied here. The analyzed rubber is vulcanized rubber, both hard and soft compound that are usually used as tire. Based on Mooney-Rivlin method, analysis of the tensile test results was conducted to obtain the SEF data. Verification was carried out by entering the SEF data into numerical simulation. Simulation using FE software was constructed as the friction contact between the rubber and its counter-surface. Results show that the values of stress and friction force in the hard compound is slightly greater than soft compound in the same cases. Fluctuating values was obtained along friction that was commonly seen in rubber friction. Additionally, by obtaining the SEF data, other mechanical properties can be predicted such as rubber hardness and rubber deformation when subjected to loading. Therefore, the mechanical performance of the rubber can be easily investigated Keywords: Mechanical properties - Strain Energy Function - Vulcanized rubber Share Link | Plain Format | Corresponding Author (Budi Setiyana)

187	Engineering	ABS-132
Application of Polymerization Technology for Increasing of Quality Oil and Gas Production Oksil Venriza (a*), Puspa Ratu (a), Andian Ari Istiningrum (a) (a) Politeknik Energi Dan Mineral AKAMIGAS, Cepu, Jawa Tengah, Indonesia Jl. Gajah Mada no 38 Cepu Blora Jawa Tengah *email : oksilvenriza[at]esdm.go.id Abstract Polymer is a chemical injection at EOR study that have expected to increasing production oil and gas, the pressing efficiency and good sweeping efficiency so that the oil recovery can be increased after water flooding from the initial oil reserve (OOIP) in the reservoir. This research will carry out the stages of making a hygroscopic polymer that is resistant to EOR conditions. This time the polymer is made using Glycidyl Methacrylate (GMA) as a monomer, Ethylene Dymethacrylate (EDMA) as a croslinker and alcohol group solvent as a porogen and trimethylamine and arginine as active group formers. This polymer is expected to be a polymer that has amine and hydroxyl functionalities and is synthetic organic polymer. The scenarios for variations in polymer concentration are 10 ppm, 20 ppm, and 50 ppm, as well as for variations in salinity of 1000 and 10,000 ppm. Meanwhile, the Trimetylamine concentration was 0.5% and 1%. In this situation, the optimum conditions were obtained at a polymer concentration of 50 ppm with Trimeylamine 1% at a salinity of 10,000 ppm, meaning that there is a linearity relationship between the increase in concentration and the resulting interface interaction. This condition needs to be developed again to get stabilization and ripeability in the repetition process in increasing the production of old wells. The test will be carried out at a temperature of 85&#730-C and observations are made of the physical properties of the fluid, including viscosity and interface interaction to seem a comparison of the physical properties of the fluid between the polymer and production water. Keywords: GMA, EDMA, Polymer, Interface Interaction, Salinity. Share Link | Plain Format | Corresponding Author (Oksil Venriza)

188	Engineering	ABS-388
The effect of fuel injection pressure on the diesel engine performances Toto Sugiarto, Wawan Purwanto, Dwi Sudarno Putra, Multharizal Khidayat, Alim Kusuma Universitas Negeri Padang Abstract The purpose of this paper is to reveal the effect of fuel injection pressure on the power and torque of a diesel engine. The research method used is the experimental method. Pressure variations of 110 kg/cm2, 120 kg/cm2 and 130 kg/cm2 were applied to a 1981 Chevrolet LUV diesel car. From the experimental results of research conducted at the Automotive Engineering Vehicle Workshop, Faculty of Engineering, Universitas Negeri Padang, it was found that, at a standard pressure of 120 kg/cm2 obtained an average car power of 29.6 kW at 4470 RPM and 81.65 Nm of torque at 2455 RPM. When the injector pressure is reduced by 110 kg/cm2, engine power decreases by 17.1% and torque decreases by 16.2%. When the injector pressure is increased to 130 kg/cm2, there is an increase in engine power by 4.05% and a decrease in torque by 14.89%. Keywords: Diesel Engine, Power, Torque, injection pressure, variations Share Link | Plain Format | Corresponding Author (Wawan Purwanto)

189	Engineering	ABS-134
Temperature Control In The R-101 Reactor With Comparing The Ziegler Nichols And Tyreus-Luyben Tuning Methods E Utami (a*), A Sahrin(a), N Maulidya(a) a) Refinery Instrumentation Engineering, Politeknik Energi dan Mineral Akamigas Jalan Gajah Mada 38, Cepu 58315, Indonesia *ernautami[at]esdm.go.id Abstract The R-101 reactor is one of the units in the Catalytic Condensation Unit (CCU), XXX Refinery. This reactor functions to reprocess the mixed C4 feed originating from the RCC Complex processing to have a higher selling value such as propylene and LPG. In this reactor, there is a polymerization reaction between the feed and the catalyst and exothermic heat transfer so that a series of control instrumentation is needed to maintain the temperature of the incoming feed at the reactor inlet. Temperature is a factor influencing conversion. The temperature control system in the reactor R-101 is a series of cascade controls by temperature outlet heater E-102 with flow steam flowing in heater E-102. This control system will be more effective if the system response is stable, namely the shorter ascent and steady-state parameters, as well as the small overshoot value. One way to do this is by tuning the PID parameters of the controller. After tuning the PID parameters for temperature control in the Reactor R 101A, it can be seen that the response graph with the Ziegler Nichols method has the most stable response compared to the actual process response and the Tyreus-Luyben tuning method but still has the same delay time parameter of 90 seconds, the long incline and steady-state is 500 seconds, but the smallest overshoot is only 0.9%. Keywords: Cascade Control, Ziegler Nichols method, Tyreus-Luyben method, Reactor process Share Link | Plain Format | Corresponding Author (Erna Utami)

190	Engineering	ABS-139
The impacts of a long residue addition to the briquette quality of Ketapang fruit and Siwalan fruit skin charcoals using amylum as additive and a manual briquette machine Suparno a, W.R. Hatiningrum b, A. Huzein c, R.D. Syahputra c, A.D Rahangmetang c , HH Naim c a Assistant Profesor at Politeknik Energi dan Mineral AKAMIGAS,58315, Indonesia b Associate Profesor at Politeknik Energi dan Mineral AKAMIGAS,58315, Indonesia c Students at Politeknik Energi dan Mineral AKAMIGAS, 58315, Indonesia Abstract A Long residue is a bottom product of an atmospheric distillation unit of crude oil. Generally this product is further processed in a refinery secondary unit to produce more yield. In case there is no refinery secondary process this bottom product is mixed with chemicals to produce marine fuel oil. This paper aims to describe the impacts of a long residue addition to the briquette quality of Ketapang or Terminalia catappa fruit and Siwalan or Borassus flabellifer L fruit skin charcoals using amylum as additive and a manual briquette machine. Each briquette composition consisted 10%, 20% and, 30% weight of long residue and, 5% weight of amylum. A manual briquette machine was used to mold the briquette. The Briquette results, then, were analyzed based on their proximate parameters and porosity. The analysis shows that the higher the long residue addition the better the briquette proximate analysis result. Some parameters such as porosity, moisture content and, calorific value fulfill the Briquette Indonesian standard nevertheless parameters such as FC, ash and, volatile matter contents need to be improved. These three last parameters relate to the raw materials chosen and, the performance of a charcoal furnace used. The compressive strength of the briquettes also does not fulfill the requirement as a manual molding machine was used for briquette process. Keywords: long residue- ketapang- siwalan- briquette- proximate analysis Share Link | Plain Format | Corresponding Author (Woro Rukmi Hatiningrum)

191	Engineering	ABS-395
Effect of The Number of FRP layers on Axial Compressive Behavior of High Strength Lightweight Concrete Wrapped with Carbon Fiber Reinforced Polymer Butje A. Louk Fanggi, Obed O. N. Nenobais, Anie A. Tuati, Abia E. Mata Politeknik Negeri Kupang Abstract Lightweight concrete has unique properties. However, the performance of such concrete that is wrapped with fiber-reinforced polymer is less investigated. This study investigates the effectiveness of covering high strength light weight concrete with carbon fiber reinforced polymer. Fourteen specimens with a different number of FRP layers were cast and tested. It is observed that increasing the number of FRP layers reduced the effectiveness of wrapping the concrete with carbon FRP. Keywords: Lightweight concrete, High Strength Concrete, FRP Share Link | Plain Format | Corresponding Author (Butje Alfonsius Louk Fanggi)

192	Engineering	ABS-140
The Influence of Lamina Wood on The Physical Properties, The Nature of Mechanics, The Strong Class on The Combination of Sengon Wood And Merbau Wood Joko Suryono 1), Yudi Pranoto 2) Civil Engineering Department of Samarinda State Polytechnic - Indonesia Abstract Wood is a material used by man to meet his life needs, both as building materials and other tools. Conditions as a construction component require large size, one that can be by making lamina wood. This study is the influence of lamina on physical properties, mechanical properties, healthy classes using MUF adhesives, which can provide knowledge, so it is utilized as an alternative to solid wood. Static bending strength test objects for 3 layers are 0.6 cm each (each layer 0.6 cm x 2 cm x 36 cm), while the thickness of the material size tests static bending strength for 5 layers of 0.4 cm (size 0.4 cm x 2 cm x 36 cm). Sliding Strength test object 2 layers thick size 2.5 cm ( size 2.5 cm x 5 cm x 5 cm). Deutsches Institut for Normung Standard (DIN) 52186. The value of lamina wood content is between 21.19% to 12.43%, density value between 0.58 g/cm3 to 0.73 g/cm3, lamina wood shear strength between 0.31 kN/cm2 to 0.64 kN/cm2, MOE between 619.17 kN/cm2 to 1327.50 kN/cm2, MOR between 5.11 kN/cm2 to 8.45 kN/cm2. Diversity analysis shows that the combination of wood type factor (A) and layer count factor (B) significantly affects MOE diversity analysis of 100.93** and 16.77**. For (MOR) significant influences of 5.66* and 7.07*. In contrast, adhesive and shear strength significantly affect on diversity analysis of 11.71** and 9.03**. Merbau wood as face/back and Sengon wood as core (p. 3 and 5) can be classified as strong grade II-III. For Modulus Of Rupture (MOR) on the treatment of Sengon wood as face/back and Merbau wood as core (3 and 5) as well as Merbau wood as face/end and Sengon wood as meat ( 3 and 5) can be classified into strong grades II-III. Keywords: Lamina wood, Physical properties, Mechanics, MOE and MOR Share Link | Plain Format | Corresponding Author (Joko Suryono)

193	Engineering	ABS-396
Influence of The number of FRP layers on Compressive Behavior of Glass Fiber Reinforced Polymer Confined High Strength Concrete Made of Lightweight Artificial Aggregates Butje A. Louk Fanggi, Ambros R. L. Wayan, Jusuf W. M. Rafael, Abia E. Mata Politeknik Negeri Kupang Abstract Lightweight concrete has some advantages that are not owned by other types of concrete. However, the performance of such concrete when wrapping with fiber-reinforced polymer is less investigated. This study investigates the effectiveness of covering high strength lightweight concrete with glass fiber reinforced polymer. Fourteen specimens made of lightweight artificial aggregate wrapped with a different number of FRP layers were cast and tested. It is shown that increasing the number of FRP layers reduced the effectiveness of wrapping the concrete with carbon FRP. Keywords: Lightweight concrete, High Strength Concrete, FRP Share Link | Plain Format | Corresponding Author (Butje Alfonsius Louk Fanggi)

194	Engineering	ABS-142
Evaluation Factors Causing A Losses in the System of Receiving, Storage and Distribution Diesel Fuel in PT Badak NGL Oksil Venriza(a*), Miftahul Jannah(a), Tri Warcono(a), Adi Luhung Pekerti (b) (a) Logistic Oil and Gas, Politeknik Energi dan Mineral Akamigas, Cepu, Jawa Tengah, Indonesia Jl. Gaja Mada No 38 Cepu (B) PT. Badak NGL Abstract Diesel fuel is a liquid fuel used in diesel engines. Diesel fuel is a petroleum fraction that has gone through a series of fraction separations. Petroleum is a mixture of hydrocarbons that are formed naturally. In general, in the liquid phase which is stored in the fuel storage tank under certain conditions. variance is a plan or target of an outcome. The variance gives an indication or a warning that the operation did not go as planned. Variance in this study is divided into two possibilities, namely losses and gains. Losses are a decrease in product volume (quantity) in each product movement and storage. While the gain is the increase in volume (quantity) of the product in each product movement and storage. PT Badak NGL has three diesel fuel operation categories, namely receiving, storage, and distribution. In the diesel fuel reception system, variance losses of -8.25% are obtained in liters units of 15&#8304-C. In the internal diesel fuel distribution system the loss value of 24,742 liters is observed. Based on the results of the calculation of losses, a fishbone diagram is made to analyze the factors causing losses in the company. Fishbone diagram analysis shows that there are several things the company needs to improve to reduce the possibilities of losses in the future. Based on observations made, recommendations that can be considered by companies include- implementation of SOPs, improve procedures considered to be lacking, addendums related to addition of clauses to limit losses, custody transfers, and determination of units used, perform maintenance of facilities and facilities in reception, hoarding and distribution operations, and improve employee competence by providing special diesel fuel handling training. Keywords: Diesel fuel, fishbone diagram, variance, losses and gain, receiving, storage, distribution of diesel fuel, control system Share Link | Plain Format | Corresponding Author (Oksil Venriza)

195	Engineering	ABS-143
THE READINESS OF BATUR METAL CASTING INDUSTRY TO FACE SOCIETY 5.0 Vivin Zulfa Atina (a), Anas Yusuf Mahmudi (b) a) Politeknik Manufaktur Ceper Klaten, Batur, Tegalrejo, Ceper, Klaten, Indonesia. Tel. +62-813-27783095, Fax. +62-272-552968. Email: *vivinzulfa0810[at]gmail.com b)Politeknik Manufaktur Ceper Klaten, Batur, Tegalrejo, Ceper, Klaten, Indonesia. Tel. +62-813-27783095, Fax. +62-272-552968. Abstract The Batur Metal Casting Industry is a metal casting industrial area that has been established since ancient times. The development of the industrial society 5.0 will certainly be a new problem if it is not accompanied by technological developments. Therefore, this study focuses on discussing the knowledge and readiness of the metal casting industry technology for the industrial society 5.0. This research has an important goal which is to be reference data as a foundation for determining policies to government, to provide protection and support the metal casting industry players. The method used in collecting this data was interviews and questionnaires involving 80 respondents. Data obtained from filling out the questionnaire by respondents consisting of three Metal Casting Industries in Batur village, Ceper, Klaten. These companies are Kop. Batur Jaya, PT. Aneka Adhi Logam and PT. Cipta Guna Lestari. The method in processing data uses SPSS 18 and Excel. 30 respondents outside the sample have been tested for validity and reliability using SPSS. The results are reliable, 76.5. The results of data processing showed that 64% of respondents thought that their industries had not yet used automatic machines. 61% of respondents think that the metal casting industry still uses manual systems in the manufacturing process. Therefore the conclusion is that the industrial society 5.0 has not yet been fully implemented in the metal casting industry because the technology used is still manual and not yet automatic. Keywords: Technology, Metal, Casting, Society 5.0 Share Link | Plain Format | Corresponding Author (Vivin Zulfa Atina)

196	Engineering	ABS-402
Uji Coba Pesawat Televisi BIS Agus Setiawan, Bagus Setiawan, Cagus Setiawan UNIMMA Abstract OKE OKE OKE Keywords: Oke, Eko Share Link | Plain Format | Corresponding Author (Agus Setiawan)

197	Engineering	ABS-406
ANP and AHP Method Approaches In Selecting of Tourism Attraction in Samarinda Noor Alam Hadiwijaya- Arbain Politeknik Negeri Samarinda Abstract The tourism sector, especially in the city of Samarinda and its surroundings, is a sector that is experiencing quite dynamic development in supporting economic growth in the area. Apart from being one of the centers of education, Samarinda is also part of a tourist destination city in East Kalimantan. The objectives to be achieved in this study are to analyze and design, as well as to find out as well as compare the outputs or rankings of the two methods that will be used in supporting decisions for the selection of tourist objects in the city of Samarinda. Determining the criteria in this study was carried out through literature studies, surveys and interviews with related stakeholders, especially in the tourism sector. Furthermore, the criteria and sub-criteria are given a pairwise comparison assessment with a preference between 1-9 for the AHP method, then the ANP method will add an assessment of mutual influence between the criteria. The results to be obtained in this study can determine the best tourism object from several alternatives based on ranking as well as to determine the comparison of the output of the two methods whether the same or different. Keywords: Tourism Attraction, ANP, AHP, Multi-criteria decision-making Share Link | Plain Format | Corresponding Author (Noor Alam Hadiwijaya)

198	Engineering	ABS-151
Study of Wear on The Metal on Polycarbonate Urethane (PCU) Contact in Total Hip Arthroplasty using Finite Element Method Study of Wear on The Metal on Polycarbonate Urethane (PCU) Contact in Total Hip Arthroplasty using Finite Element Method Wahyu Dwi Lestari (a*), Luluk Edahwati(a), Ndaru Adyono(a), Rifky Ismail (b), J Jamari(b), A P Bayuseno(b) Department of Mechanical Engineering, Faculty of Engineering, University of Pembangunan Nasional ^Veteran^ Jawa Timur, East Java, Indonesia, Jl. Raya Rungkut Madya, Gunung Anyar, Surabaya, Indonesia, Phone : +62 (031) 870 6369 *wahyu.dwi.tm[at]upnjatim.ac.id Department of Mechanical Engineering, Faculty of Engineering, Diponegoro University Jl. Prof. Soedarto, Tembalang, Semarang 50275, Indonesia, Phone: 024-7460059 Abstract Latterly, the polycarbonare urethane (PCU) has suggested a viable substitude to conventional bearings. The aim of this study is to determine the von Mises stress and contact pressure as a function of different of acetabular cup thickness. The analysis of this study was conducted by the finite element method. Six variation of acetabular liner thickness (5mm, 10mm, 15mm, 20mm, 30mm, and 40mm) were used in this simulation. The contact pressure was determined to predict the wear performance of PCU acetabular liner. The result shown that the thicker of the acetabular liner, the smaller the contact pressure and the smaller the contact radius. Thus predictable that the thinner the PCU acetabular liner, the higher the wear rate Keywords: #PCU #contact pressure #von Mises Share Link | Plain Format | Corresponding Author (Wahyu Dwi Lestari)

199	Engineering	ABS-155
Formation of Struvite from dairy cow urine by aeration and crystallization using a vertical reactor Luluk Edahwati (a*), Wahyu Dwi Lestari (a), Sutiyono (a), J Jamari (b), A P Bayuseno (b) Department of Mechanical Engineering, Faculty of Engineering, University of Pembangunan Nasional ^Veteran^ Jawa Timur, East Java, Indonesia, Jl. Raya Rungkut Madya, Gunung Anyar, Surabaya, Indonesia, Phone : +62 (031) 870 6369 *Lulukedahwati[at]gmail.com Department of Mechanical Engineering, Faculty of Engineering, Diponegoro University Jl. Prof. Soedarto, Tembalang, Semarang 50275, Indonesia, Phone: 024-7460059 Abstract Struvite is a white crystal which is chemically known as magnesium ammonium phosphorus hexahydrate (MgNH4PO4&#42895-6H2O) which is formed with the same molar ratio. Struvite dissolves readily in acidic conditions and slightly soluble in neutral and alkaline conditions. The phosphate and ammonium content in the urine of dairy cows has a high amount too. The process of forming struvite from dairy cow urine is carried out using the aeration method in a vertical reactor. MAP solution was prepared by reacting Mg: NH4: PO4 using a molar ratio of 1: 1: 1. The solution was made at pH 9 while temperature variations were 25, 35, 45 oC. The air rate is kept at a cost of 0.5 liters / minute. The struvite precipitate obtained was filtered and then dried. The results showed that the percentage of phosphate and ammonium as the best struvite formers at 45&#730-C was 33.2% and 26.9%. Keywords: #aeration #crystallization #struvite #urine #vertical reactor Share Link | Plain Format | Corresponding Author (Luluk Edahwati)

200	Engineering	ABS-168
Military Type III Anodizing: The optimal limit within hardening process of aluminium alloy at near zero temperature Ndaru Adyono, W D Lestari, Luluk Endahwati University Pembangunan Nasional Veteran Jawa Timur Abstract Hard anodization was a method that can enhance aluminium alloy surface characteristics by growing an aluminum anodic oxide (AAO) film on it surface. This method was very applicable to obtain a thick and hard coating. This process was carried out at galvanostatic potentiostatic mode at high current densities (j = 4.2 A/dm2), high target voltages (Vt = 30 to 60 V) and low electrolyte temperature. Two sulfuric acid electrolyte was compared, the first solution was sulfuric acid 11 percent vol., the second one was sulfuric acid 11 percent vol. plus oxalic acid 1 percent wt, both of them was conditioned at below 5 degree celcius. The maximum AAO film thickness and hardness obtained was 110.01 micrometer and 400 HV. The increasment of target voltage was directly proportional to the increase in thickness and hardness of the AAO film. The results of this study could be synergized with the manufacturing process of aluminum alloy-based (Al6061) components at the product finishing stage. The logarithmic regression in the function of target voltage could be used to estimate film thickness and hardness of the films. Keywords: Aluminium Alloy 6061, Aluminium Anodic Oxide, Hard Anodizing Share Link | Plain Format | Corresponding Author (Ndaru Adyono)

201	Engineering	ABS-173
Comparison Of Effectiveness Of Stemming Algorithms In Indonesian Documents Dyah Mustikasari(a), Ida Widaningrum(b*), Rizal Arifin(c), Wahyu Henggal Eka Putri(d) a) Universitas Muhammadiyah Ponorogo b) Universitas Muhammadiyah Ponorogo *iwidaningrum[at]umpo.ac.id c) Universitas Muhammadiyah Ponorogo d) Universitas Muhammadiyah Ponorogo Abstract Stemming is a process to determine basic word with some rules. In Bahasa Indonesia, the way is to eliminate prefixes, infixes, suffixes, or combination of prefixes and suffixes in derivative words. Several stemming algorithms for Bahasa Indonesia have been developed. But their effectiveness has not been studied. In this study, these three stemming algorithms will be compared. We used 900 affixes to conduct the comparison. Each word is searched for their basic words using the three algorithms. The basic word resulted then referred to KBBI or Indonesian dictionary to see whether they are right. Comparison process of stemming show that Sastrawi^s could do the best stemming that 95,2% of the affix words tested could be root words. The Nazief & Adriani Algorithm resulted 92,4%, while Arifin Setiono^s finished at 89%. It could state that Arifin Setiono^s needs a lot of improvement because many affixed words could not return to the root word. Keywords: Effectiveness- Stemming- Indonesian Share Link | Plain Format | Corresponding Author (Dyah Mustikasari)

202	Engineering	ABS-176
The Design and Analysis of Oil Cooler System on Motorcycle 100 CC of Engine Volume Rinasa Agistya Anugrah, Muhammad Hanif Darminto Universitas Muhammadiyah Yogyakarta Abstract The oil cooler cooling system is a cooling system engine that serves to reduce the temperature of lubricating oil contained in the cylinder. The oil cooler system aims to keep the oil temperatures stable to keep the maximum lubrication system. This temperature measurement aims to determine the difference between engine temperature before and after the installation of the oil cooler system on the Honda Supra X 100 motorcycle and to know the influence of track variation on engine temperature. The result of the data obtained from the engine temperature data before and after the installation of oil cooler system is that there is a difference of engine temperature before and after the installation of oil cooler system on the Honda Supra X 100 motorcycle with an average of 25% reduction and there is the influence of track variation to engine temperature. The effect makes the temperature drop in the front of the head is larger than the other surfaces. Keywords: Analysis, design, oil cooler, engine temperature Share Link | Plain Format | Corresponding Author (Rinasa Agistya Anugrah)

203	Engineering	ABS-179
The Classification for Corroded Reinforced Concrete Beams using Linear Discriminant Analysis Ahmad Zaki (a,*), Zainah Ibrahim, Yessi Jusman (a) Department of Civil Engineering, Faculty of Engineering, Universitas Muhammadiyah Yogyakarta *ahmad.zaki[at]umy.ac.id (b) Department of Civil Engineering, Faculty of Engineering, University of Malaya (c) Department of Electrical Engineering, Faculty of Engineering, Universitas Muhammadiyah Yogyakarta Abstract Corrosion of the steel reinforcements in RC structures is a worldwide problem. The corrosion has been recognized as the major deterioration mechanism which affects RC degradation due to the environmental actions. The costs of repair and maintenance of corroded structures worldwide exceed billions of dollars per year. It becomes necessary that the effects of steel reinforcement corrosion to the functionality of RC structures be detected at an early stage and studied in detail using acoustic emission (AE) technique in order to provide effective means of remedial. The purpose of the study is damage classification method for corroded reinforced concrete (RC) beams using AE data. This study proposes a damage classification method for corroded reinforced concrete (RC) beams subjected to flexural loading by linear discriminant analysis (LDA) of acoustic emission (AE) data. In this study, damage classification of the corroded beam specimens using AE parameters and LDA has been successfully conducted. RA value of AE parameter experienced a significant drop at Stage 2. Furthermore, the drop of RA value is used for the classification using LDA. The classification data give information in terms of statistical features based on the correlation of the distribution data. The effectiveness of LDA has been demonstrated empirically to classify the corroded beam to the classification with the high accuracy. The promising results obtained in the analysis are proposed to classify the fracture type of the corroded specimens. Keywords: Corrosion, Concrete, Acoustic Emission, AE parameters, LDA Share Link | Plain Format | Corresponding Author (Ahmad Zaki)

204	Engineering	ABS-185
Proposed Reversed Supply Chain as Problem Solver for Case of Returned Beef Products during the Covid-19 Pandemic Paduloh Paduloh (1*), Taufik Djatna (2) (1)Industrial Engineering, Bhayangkara Jakarta Raya University, 12140, Indonesia (2)Agro-Industrial Engineering, IPB University, 16680, Indonesia Abstract Beef is an agro-industrial product that is perishable has a high risk in the pandemic era. Where the Covid-19 pandemic has an impact on decreasing consumption of products in various sectors, including beef, with the closure of restaurants and cafes, it will affect the accumulation of beef supplies so that the quality decreases and causes multiple problems. This study aims to provide solutions for beef products returned from customers not to become waste and have a detrimental impact on the company. To design a reverse supply chain model research, it begins with field observations, designing a reverse supply chain network strategy, and creating a reverse supply chain flow process. The economic value of beef returned from customers is maximized by selling it to customers who do not store meat, and it runs out quickly or to meat-based industries. Products that cannot be consumed by humans can be used as animal or livestock feed. From the research, it was found that the reverse supply chain can have a positive impact on the economic value of the product and an indirect effect on the environment by preventing the product from turning into waste. Keywords: Reverse Supply Chain- Beef- Returned product- Covid-19. Share Link | Plain Format | Corresponding Author (Paduloh Paduloh)

205	Engineering	ABS-208
CFD Simulation Analysis of Thrust Bearing Lubrication Performance with Height of Texture Variation and Cavitation Modeling M Muchammad (a*), M Tauviqirrahman (a), H Nurahman (a), J Jamari (a) a) Laboratory for Engineering Design and Tribology, Mechanical Engineering Department, Diponegoro University, Indonesia Abstract Increasing bearing performance can be done in load support by adding texture on the bearing surfaces. In this paper, a study of height textured effect on hydrodynamic thrust bearing by considering cavitation is presented. The textured surface is applied in rectangular geometric with several dimension. Single-textured thrust bearing with several height was analyzed by numerical methods based on Reynolds equation and 2D CFD model analysis based on Navier-Stokes equation. The result showed that the pressure distribution with higher textured surfaces can increases the load support in hydrodinamic thrust bearings, in other words height of the texture will affect thrust bearing performance. Keywords: Thrust bearing- cavitation- load support- texture Share Link | Plain Format | Corresponding Author (M. Muchammad)

206	Engineering	ABS-209
Validity of Navier-Stokes Equation in Single-Textured Thrust Bearing by Considering Reynolds Number and Cell Aspect Ratio M Muchammad (a*), M Tauviqirrahman (a), H Nurahman (a), J Jamari (a) Laboratory for Engineering Design and Tribology, Mechanical Engineering Department, Diponegoro University, Indonesia Abstract Research about hydrodynamic thrust bearing always been developed, the most concern is case about texture with several configuration. Numerical approaches using Reynolds equations and CFD simulation based on Navier-Stokes equations are a common method that used to analyze bearing performance, but not all bearings can be examined by these two methods. Therefore, to find out parameter and boundary, it is necessary to analyze the effect of thrust bearing geometry by using Reynolds equation and Navier-Stokes equation. Single-textuerd thrust bearing with several geometry by certain reynolds number and cell aspect ratio was analyzed by CFD, and will be compared with the results based on the Reynolds equation. The result showed that the thrust bearing with proper cell aspect ratio and reynold number configuration could be analyzed using both methods, so we must configure velocity and use geometry correctly Keywords: Thrust bearings- texture- cell aspect ratio- reynolds number Share Link | Plain Format | Corresponding Author (M. Muchammad)

207	Engineering	ABS-210
Utilization of Industrial Waste as Soil Stabilizer to Enhance Direct Shear Strength Anita Setyowati Srie Gunarti (a*), Irwan Raharja (b) a) Faculty of Engineering, Universitas Islam 45 Jalan Cut Meutia No. 83 Bekasi, Indonesia (b) Faculty of Information Technology, Universitas Bina Sarana Informatika Jalan Banten No.1, Karangpawitan, Kabupaten Karawang, Jawa Barat, Indonesia Abstract A problem that often occurs in industrial areas is roads damage that are caused by the low carrying capacity of their subgrade as well as by over capacity of heavy vehicles passing through that roads. A lot of waste that is produced in industrial areas, which also another problem, can be used as soil stabilizers. This study proposed a method using industrial waste as stabilization material to improve the carrying capacity of the soil. Testing materials are prepared for both original and stabilized soil using three types of industrial waste, namely Silica Sand waste, and Dust Sand Foundry. One of mechanical property tests, i.e. direct shear test, was conducted with different percentage of waste for each sample. Result showed that there was 36.8% increase in the internal shear angle of the modified soil with 2.5% Dust Sand Foundry additives without the addition of Silica sand waste compared to the internal shear angle of the original soil. Keywords: industrial waste- direct shear- clay- dust sand foundry- silica sand Share Link | Plain Format | Corresponding Author (Anita Setyowati Srie Gunarti)

208	Engineering	ABS-216
Application of Continuous Wavelet Transform to Layer Boundaries Detection from Gamma Ray Log Arya Dwi Candra(a*), Bambang Yudho Suranta(a), Sulistyono(a), Nur L. Maulidiyah(b), Andri Syafriya(c), Dessy Widya(c), Sungkono(b) a) Oil and Gas Production Engineering Department, Politeknik Energi dan Mineral Akamigas, 58315, Indonesia b) Department of Physics, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, 60111, Indonesia c) PetroChina International Jabung Ltd., Jakarta, Indonesia. Abstract Layer boundary analysis is an important process in determining the net pay value. Although the layer boundary can be determined manually through mud log data, it can also be determined automatically by signal analysis using wavelet transform. This analysis uses the gamma ray (GR) log data and the resistivity log. The type of wavelet used is Continuous Wavelet Transform (CWT). The CWT workflow begins with a blocking trace process to find inflection points in the GR log data and the resistivity log based on derivative analysis by convoluting the signal with the wavelet operator that matches the original frequency. Several parameters are required as input of the wavelet transform method such as number of layers detected and minimum thickness requirements which are 3 and 1. As for the input, the percentage of layer extract varies from 25%, 30% and 35%. The result of the comparison of layer boundaries from mud log data with CWT has the lowest difference in the yield of layer extract 35%. Where the results of the layer boundary on the mud log data on NP 1, NP 2, P 1, P 2 and P 3 wells are 155, 248, 29, 10 and 343, respectively, while the results of the bed boundary with 35% layers extract at NP 1, NP 2, P 1, P 2 and P 3 wells are 168, 192, 30, 11 and 312 layers, respectively. The big difference of layer number identification in the NP1, NP2 and P3 is presumably because the CWT algorithm does not involve thin layer analysis (less than 1 ft). Keywords: Layer boundary- Continuous Wavelet Transform- Log Gamma Ray- Mud Log- Talang Akar Formation, South Sumatra Basin Share Link | Plain Format | Corresponding Author (Arya Dwi Candra)

209	Engineering	ABS-225
EFFECT OF RUBBER DEFORMATION ALONG SLIDING CONTACT ON ITS STRESS AND FRICTION FORCE: A NUMERICAL INVESTIGATION Budi Setiyana, Rifky Ismail, S. Sugiyanto, J. Jamari Mechanical Engineering Department, Faculty of Engineering, University of Diponegoro, Jl. Prof. Soedharto SH, Kampus Tembalang, Semarang 50275 Abstract Rubber is a material that easily deforms when subjected to friction, such as in tires, seals and transmission belts. It is very important to understand the relationship of deformation to its stress and friction forces that occur on the rubber. The stress and friction force that occur are closely related to the strength and braking capacity of the rubber, especially for the rubber used in tires. This paper investigates the effect of rubber deformation along friction on its stress and friction force of the rubber surface. Friction contact between the rubber surface and a rigid indenter is modelled numerically using Finite Element (FE) software. Analyzed rubber is Styrene Butadiene Rubber (SBR) and considered as a hyper-elastic material based on Mooney-Rivlin model. Analysis is carried out at specified depth of indentation, surface roughness and sliding speed. Results show that the degree of deformation will be higher for the larger indentation depth and surface roughness. Along friction, the high degree of deformation causes high stress and friction forces of the rubber surface, however, fluctuating value of those parameters is obtained here. Keywords: deformation, Finite Element, friction, rubber Share Link | Plain Format | Corresponding Author (Budi Setiyana)

210	Engineering	ABS-227
Low Level Controller Analysis using Digital PID Controller on Self Balancing Robot in Corrugated Path Seta Samsiana, Setyo Supratno, Bayu Cendana Faculty of Engineering, Universitas Islam 45 Bekasi Abstract Two-wheel self-balancing robot is a mobile robot that has two wheels on the right and left that will not be balanced without the controller.The PID controller can be used to control the robot^s position in order to maintain its balance whileruns on a bumpy road by adjusting the corresponding proportional constant (Kp), integral constant (Ki) and derivative constant (Kd)by using trial and error method. Control system analysis is based on 3 aspects of analysis, those aretransient response analysis, steady state response analysis and stability analysis. The results of the trial and error method in this study are that the robot can maintain its balance whlie runs on a bumpy road with values of Kp = 50, Ki = 170 and Kd = 2.2. The results of the analysis of the PID parameters are the self balancing robot^s responses included in the overdamped category, with a value of% error steady state =1.078% and robot stability included in the marginal stable category. Keywords: Self Balancing Robot, PID,Trial and Error Share Link | Plain Format | Corresponding Author (Seta Samsiana)

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