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INTEK: Jurnal Penelitian
Published by Politeknik Negeri Ujung Pandang
ISSN : 23390700     EISSN : 26155427     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Engineering
INTEK is a journal managed by the Journal and Publication Development Unit of Ujung Pandang State Polytechnic, which is published twice a year, in April and October. The journal INTEK has also been indexed. The INTEK Journal accepts research scripts in the fields of technology and engineering such as: Electrical, Mechanical, Civil and Chemical Engineering.
Arjuna Subject : Umum - Umum
Articles 211 Documents
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Studi Pendahuluan Ekstraksi Bertingkat Minyak Biji Mangga Arumanis (Mangifera Indica) Menggunalan Pelarut N-Heksan dan Etanol Masúd, Fajriyati; Puspitasari, Puspitasari
INTEK: Jurnal Penelitian Vol 4 No 1 (2017): April 2017
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (338.99 KB) | DOI: 10.31963/intek.v4i1.92

Abstract

Mango seeds containing oil of about 20-37%, is one source of vegetable oil that has not been touched. Mango seed oil contains polyphenols, so the potential is developed as a functional food. Mango seed oil contains high solid, it can be developed into a product resembling spreadable margarine. The aim of this study was to determine the ratio of solvent, temperature, and time is optimum for extracting mango seed oil. Mango seed oil has been extracted by multistage extraction with hexane and ethanol. Extraction process was performed using reflux method at 30, 35, 40, 45, 50, 55, 60°C, for 1, 2, 3, 4, 5, 6 hours, with solvent ratio of 1: 2, 1: 3, 1: 4, 1: 5, 1: 6. The results showed that the ratio of solvent 1: 4, 50°C for 4 hours is the best condition for extracting mango seed oil by multistage extraction using n-hexane and ethanol.
Aplikasi Aktuator Pneumatik sebagai Simulator Beban Dinamis Vertikal pada Mekanisme Suspensi Roda Kendaraan Seperempat Ka’ka, Simon; Himran, Syukri; Renreng, Ilyas; Sutresman, Onny
INTEK: Jurnal Penelitian Vol 5 No 2 (2018): Oktober 2018
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1853.039 KB) | DOI: 10.31963/intek.v5i2.580

Abstract

Driving comfort for riders and passengers is a keytarget to be achieved. Fluctuations in vehicle loads, bumps,perforated surfaces, and other road damage will greatly affectthe vehicle suspension working system. This study aims tocalculate the vertical dynamic load of the vehicle actually whichoccurs on road construction after through the vehicle wheelsuspension mechanism. The Pneumatic cylinder that was drivenby pressurized air directly weigh on the spring and ShockAbsorber that contained on the wheels of the vehicle. The loadfluctuations of the medium weight category vehicle aredetermined by the regulation of the amount of pressurized airentering into the pneumatic cylinder chamber pushing the pistonand connecting rods. The deviation that occurs duringcompression on the Spring and Shock Absorber, is substitutedinto the vehicle dynamic load equation by taking also themagnitude of the spring stiffness constant, and the fluid or gascoefficient of the damper. The results showed that the magnitudeof the displacement when the compression force worked hassignificantly influenced the amount of vertical dynamic load ofthe vehicle that overlies the road construction. Experimentalresults using pneumatic actuators instead of real dynamic vehicleloads illustrate the characteristics of the relationship betweenwork pressure and dynamic load. If the working pressure of P2(bar) is given great, the vertical dynamic load Ft (N) whichoverloads the structure of the road is also greater. From thegraph shows that shock absorbers have greater ability to reducedynamic load vertically when compared to spring ability.
Calculating the Power Demand in Turning of AISI 316L Stainless Steel Through the Cutting Forces Data Nur, Rusdi
INTEK: Jurnal Penelitian Vol 3 No 1 (2016): April 2016
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (416.844 KB) | DOI: 10.31963/intek.v3i1.24

Abstract

Abstract—Austenitic stainless steel AISI 316L has been widely used for orthopedic implants due to its mechanical properties, corrosion resistance and biocompatibility. Machining of austenitic stainless steel are often regarded as 'difficult to machine' and classed a single group of steels, based on experience with the most common austenitic types. This paper presents a methodology for practical calculation of power demand based on cutting force that will be compared with experimental results especially turning process. Based on a previously proposed definition, the power demand in metal cutting is the energy required cutting. This paper provides a complete list of mathematical expressions needed for the calculation of power demand and demonstrates their utility for turning operation of austenitic stainless steel using coated and uncoated carbide.
Pengaruh Air Laut sebagai Air Pencampur dan Air Perawatan pada Karakteristik Pasta Semen dan Mortar Ali, Adiwijaya; Datu, Irka Tangke
INTEK: Jurnal Penelitian Vol 5 No 1 (2018): April 2018
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (411.679 KB) | DOI: 10.31963/intek.v5i1.196

Abstract

The goal of this research is to investigate the influence of seawater as mixing water and curing water on characteristics of cement paste and mortar. Research was conducted with making mixtures of cement paste and mortar using two kind of cement, Portland Composite Cement (PCC) and Pozzolana Portland Cement (PPC) with seawater as mixing water. Characteristics of fine aggregate and characteristics of cement paste with seawater mixing were investigated. Furthermore, 144 cube mortar specimens in size of 5 cm x 5 cm x 5 cm in four series mortar mixtures were casted according with SNI 03-6825-2002. At 24 hours after specimens were casted, cube mortar specimens were cured in tap water curing (TC), seawater curing (SC) and air curing (AC). After achievement at certain curing day of 3, 7, 14 and 28 days, cube mortar samples were tested in compressive strength. Results concluded that seawater mixing improves compressive strength of mortar up to 28 days in all curing conditions, TC, SC and AC. Moreover, strength of mortar is not affected by type of curing water, tap water or seawater.
Modification and Testing of Wind Turbine with Double Savonius Yunus, A. M. Shiddiq; Wahdah, Adhe
INTEK: Jurnal Penelitian Vol 3 No 1 (2016): April 2016
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1082.03 KB) | DOI: 10.31963/intek.v3i1.8

Abstract

Indonesia geographically located at tropical region where the wind is very fluctuate and relatively slow. Therefore it is important for designer to investigate the proper design of the slow wind speed turbine that applicable in Indonesia. In this paper, Savonius wind turbine is selected and modified with double level to explore its capability in generating voltage. The main aim of this study is to investigate the performance of the double Savonius turbine in term of its capability in generating voltage. In experimental test, it can be obtained that the double Savonius Turbine could effectively generate 12V at 3 m/s and 17V at 5.4 m/s.
Perancangan Website Sekolah pada SDN 103 Kabupaten Sinjai sebagai Salah Satu Sarana Pembelajaran Online dan Penyajian Informasi Nahlah, Nahlah; Amiruddin, Amiruddin; Amansyah, Farida
INTEK: Jurnal Penelitian Vol 4 No 2 (2017): Oktober 2017
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1250.508 KB) | DOI: 10.31963/intek.v4i2.149

Abstract

The existence of school's website is a necessity that can not be avoided anymore. School's website is very useful as one of online learning and information presenting medium and also as a prerequisite for some inter-schools competition. Without the school's website, a school can not be a winner in a particular competition, like "Fund Management of School Operation Assistance". This situation has been experienced by the State Elementary School 103 Sinjai which failed to get the championdue to unavailability of the school website. This research aims to design a school website for the State Elementary School 103 Sinjai. The website that will be created uses PHP and MySQL-based CMS. Content and features of the website is created as the result of interviews with school's parties. The collecting of data was done by observation, documentation, and literature study. The softwares that used were Xampp, Dreamweaver Macromedia, one of isntallation package of PHP, Apache web server, and MySQL, as well as Research and Development's CMS. After installation of the softwares and Research and Development's CMs was completed, it was followed by adjustment of website content by logging in to the admin page. The created website has domain link as follows : http://sdn103sinjai.sch.id which has been published since the beginning of May 2016 and has been used by school parties in providing information about the various (all sort of) school activities.
Studi Kinetika Konsumsi Glukosa oleh Aspergillus Niger dalam Produksi Bioethanol dari Lignoselulosa Widiyanti, Setyo Erna
INTEK: Jurnal Penelitian Vol 4 No 1 (2017): April 2017
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (921.5 KB) | DOI: 10.31963/intek.v4i1.98

Abstract

Global warming resulted from CO2 level increase in the atmosphere has caused elevation of earth temperature and uncertain climate changes. To prevent the rise of CO2 in the atmosphere can be done by using biomass fuel such as bioethanol. The raw materials of bioethanol can be derived from oil palm empty fruit bunch. Enzymatic hydrolysis utilizes cellulase-producing fungus and in this research, Aspergillus niger was chosen. The glucose produced is consumed by A niger as carbon source and this is undesirable, therefore it should be minimized as low as possible. Knowing the rate of glucose consumption is important to have a model of the hydrolysis reaction rate which will be helpful in the design process on an industrial scale hydrolysis reactor. This study aimed to determine the equations that can be used to approximate the growth rate of A. niger, glucose consumption, the formation of citric acid, and the kinetic parameters used to modeling the kinetics of glucose consumption by A. niger. Kinetics of glucose consumption by A. niger was studied in batch system with variation of initial glucose concentration of 30, 50, 70 g/l. The growth rate of A. niger, glucose consumption, and the formation of citric acid were modeled using 3 equations; i.e. Monod with non-competitive product inhibition, Luedeking-Piret, and Luedeking-Piret growth associated product formation, respectively. The values of kinetic parameters such as μmax, Ks, Kp, were 0.65 hour-1, 157.5 g/l, 0.3 g/l, for initial glucose concentration of 30, 50, 70 g/l, respectively. The values of α (kinetic parameter for growth associated product formation and α would be equal to Yp/x) and Yx/s were 0.4903, 0.8531, 0.9863; 0.5124, 0.2704, 0.2381, for initial glucose concentration of 30, 50, 70 g/l, respectively. Higher initial glucose concentration would increase α but it lowered Yx/s.
Analisis Kandungan Lignin, Sellulosa, dan Hemisellulosa Serat Sabut Kelapa Akibat Perlakuan Alkali Kondo, Yan; Arsyad, Muhammad
INTEK: Jurnal Penelitian Vol 5 No 2 (2018): Oktober 2018
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (391.95 KB) | DOI: 10.31963/intek.v5i2.578

Abstract

The long-term goal of this research is to makecoconut fiber composite as one of the technical material, forbuilding material such as ceiling board or for automotivematerial such as bumper. While the specific target to be achievedin this research is to determine the influence of the concentrationof alkali solution on soaking coconut fiber to the content of lignin,cellulose, and hemicelluloses of coconut fiber. To achieve theobjectives and targets, the method of implementation of thisresearch is divided into 4 (four) steps, namely (1) preparation, (2)immersion, (3) testing, and (4) analysis. Coconut fiber is treatedby soaking coco fiber for 3 hours in sodium hydroxide (alkali)solution with concentrations of 5%, 10%, 15%, 20%, 25%, 30%,35%, 40%, 45%, 50%, and 55%. Once soaked, the coconut fiberis rinsed with aqua, then dried in an oven at 60°C for 4 hours.After that, a composition test with hydrolysis method todetermine the content of lignin, cellulose, and hemicelluloses.Each variable will be tested 3 (three) times. The data obtainedwill be analyzed statistically by applying descriptive method,where all data obtained will be presented in table, graphic, orimage form. Based on the tables, graphs, and images will beanalyzed and drawn conclusions. The results to be achieved inthis study is to determine the content of lignin, cellulose, andhemicelluloses coconut fiber due to alkali treatment for 3 hourswith a variable concentration of alkali solution. Based on theresults and discussion it can be concluded that soaking coconutfiber in alkaline solution degrades the content of hemicelluloses,cellulose and lignin.
Produksi Fruktosa dari Tongkol Jagung Sebagai Gula Rendah Kalori Mahyati, Mahyati; Pasanda, Octovianus SR
INTEK: Jurnal Penelitian Vol 3 No 2 (2016): Oktober 2016
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1956.803 KB) | DOI: 10.31963/intek.v3i2.59

Abstract

Corn cobs as waste organic agricultural having content±45% cellulose. Cellulose is a biopolymer that can be converted into glucose. Glucose can be produced by A.niger and T.ressei through fermentation process. Glucose in generate can be developed to become fructose syrup through a process isomerisasi with enzymes glucoisomerase prodused by Streptomyces Sp. This research using corn cobs yellow as a source of cellulose for the production of fructose. The purpose of this research is to find concentration fructose syrup obtained from fermentation process. Convertion cellulose be done in enzimatis use A.niger and T.ressei through the fermentation process by adding Saccharomyces cerevisiae. The process continues with isomerization use Streptomyces Sp. The process isomerization done with variations time is 1,2,3, and 4 hour and variation pH 6,7, and 8. Analysis concentration glucose and fructose of fermentation product performed with GCMS. The highest result obtained was fermentation 1 hour at pH 6 with glukoce 6,7% and fructose 16,22%.
Produksi Biodiesel Sistem Batch dan Uji Emisi pada Mesin Diesel Suryanto, Suryanto
INTEK: Jurnal Penelitian Vol 5 No 1 (2018): April 2018
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (471.133 KB) | DOI: 10.31963/intek.v5i1.201

Abstract

Tujuan dari penelitian ini adalah untuk mendapatkan model proses pembuatan bio-diesel yang cocok untuk mendukung industri bio-diesel lokal dan nasional dengan desain yang fleksibel dan efisien. Rekayasa desain prototipe reaktor bio-diesel dan pemasangannya didasarkan pada metode transesterifikasi, sistem batch. Minyak nabati (minyak sawit) dan metanol 99,8% digunakan sebagai bahan baku sementara natrium hidroksida (NaOH) yang dimurnikan digunakan sebagai katalis dalam reaksi transesterifikasi. Sembilan sampel telah diuji pada pilot-plant. Perbandingan molar volume terbaik antara minyak dan alkohol yang mendapatkan kualitas terbaik dari produk biodiesel adalah sekitar 10: 1,5 hingga 10: 2,0; dengan katalis 0,6%. Biodiesel (percobaan produk) juga telah diuji khususnya di mesin diesel tunggal yang dicampur pada konsentrasi 25% dan 50% dengan petrodiesel. Mulai dan menjalankan mesin tidak ada masalah dan analisis gas buang juga menunjukkan hasil yang baik. Gas CO dan HC berkurang secara signifikan dan ini menunjukkan bahwa penggunaan bio-diesel dapat meningkatkan proses pembakaran di mesin diesel.

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