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Prihatin Oktivasari
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INDONESIA
JURNAL POLI-TEKNOLOGI
Published by Politeknik Negeri Jakarta
ISSN : 14122782     EISSN : 24079103     DOI : https://doi.org/10.32722/pt.v20i1
Core Subject : Science, Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation
Poli-Teknologi Journal is a journal, which began publication in 2002, published by the Research and community service Unit of Politeknik Negeri Jakarta. It starts from Volume 1 Number 1 in January 2022 for printed version; ISSN (print) 1412-2782 and ISSN (online) 2407-9103. Poli-Teknologi Journal is a series of scientific publications in applied science and technology area from the perspective of a multi and interdisciplinary studies and it is published 3 times in year.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 410 Documents
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Monitoring Dan Evaluasi Jalan Raya Rawan Longsor Di Kelurahan Tanah Baru Kecamatan Beji Depok Dan Upaya Penanganannya Achmad Nadjam; Budi Damianto
Jurnal Poli-Teknologi Vol. 19 No. 1 (2020)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v19i1.2368

Abstract

The Tanah Baru Depok Road is 4.12 km in length consisting of two lanes connecting the Jakarta-Depok route. Current conditions with a road width of 5.2m during the rainy season on the right side of the new dirt road, there are certain parts of the STA, there are certain road conditions that are cracked and landslides. rainy season. The purpose of this research is to conduct monitoring and evaluation of the handling that has been done on the highway, as well as providing these results to make planning for the prevention of landslide prone roads. Stages of methods to be carried out during monitoring are identification of landslide hazard locations (not / moderate / already handled), identification of causes of landslides, identification of consequences, morphological analysis, geology, hydrology, and land use. Whereas in the evaluation stage is the analysis of the handling that has been done and the determination of new treatments. The results of monitoring and evaluation are there are 5 locations on STA Km 3 + 240 and STA Km 3 + 650 landslides, STA Km 1 + 970 and STA Km 2 + 450 potential landslides, STA Km 3 + 840 have dangerous roadside because there is no road divider. Countermeasures for landslide areas are carried out by installing a retaining construction on the right side of the road that intersects the river in the form of a cantilever wall. +840 mounted guardrail to prevent vehicles from entering the river bank..
ANALISIS SWOT UNTUK DIRECT CO-FIRING BATUBARA DENGAN PELLET SAMPAH PADA BOILER TIPE CFBC Muhammad Fadli; Dianta Mustofa Kamal; Pribadi Mumpuni Adhi
Jurnal Poli-Teknologi Vol. 18 No. 3 (2019)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v18i3.2391

Abstract

Indonesia to be the world’s second-largest contributor of plastic waste in the oceans. Every resident in Indonesia can produce 0,52 kg/person/day of waste. Efforts to overcome the problem of waste by processing it into Pellets, which contain calories from 2,800 to 3,300 kcal/kg using the peuyeumisasi method, so that they can use for co-firing in PLTU. Trial for direct co-firing coal and RDF Pellet from Klungkung Bali, will be carry out on Circulating Fluidized Bed Combustion (CFBC) boiler. The goal of study to analyze the feasibility for co-firing with SWOT analysis. The SWOT analysis questionnaire was compiled based on internal and external factors, which was carried out through the study of literature and document. After the questionnaire was compiled, the questionnaire was given to respondents who collected 10 people, selected based on factors of relevance and understanding of the issues discussed. The results of the questionnaire show the main indicators, which are divided into 2 parts, internal factors consisting of strengths, weaknesses and external factors consisting of opportunities and threats. Then implemented in the SWOT matrix, to get the best strategy and whether the decision is feasible or not. The results is feasible to be implemented in the PLTU MSW, with internal factor value of 3,03 or rounded to 3 (strong) and an external factor value of 2,6 or rounded to 3 (strong). Several strategies are designed to use the strength to take advantage of opportunities, reduce weaknesses and threats.
REKAYASA NANO KOMPOSIT TITANIUM OSKIDA SEBAGAI KATALIS PEREDUKSI ZAT WARNA TEKSTIL Iwan Susanto; Nugroho Eko Setijogiarto; Tia Rahmiati; Fachruddin Fachruddin; Arifia Ekayuliana; Jauhari Ali
Jurnal Poli-Teknologi Vol. 18 No. 3 (2019)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v18i3.2392

Abstract

The core shell structure of TiO2@SiO2@ferrite(Ni-Cu-Zn) as composite nanoparticles for magnetic photocatalyst were successfully prepared in this study. These particles were synthesized continually by the sol-gel method and they are tested for their performance using MB dye solution. The magnetic core particles used in the synthesis were (Ni-Cu-Zn) ferrite with size of 20-60 nm, while SiO2 and TiO2 layers were formed using tetraethoxysilane and tetrabutly titanate. Some characterizations and testinghavecarried out to investigate the crystal structure, magnetic properties, surface conditions and performance of these particles. The results show that the anatase crystal structure of TiO2 was obtained on the outer shell of the particle, while the magnetization value and surface area were achieved at 4.74 emu/g and 126,831 m2/g, respectively. The nanoparticles of composite size were obtained about 10 to 40 nm with the shell thickness up to 4 nm. The performance results of photodegradation was quite good for reducing MB dye up to 63.37%.
MODIFIKASI BUCKET ELEVATOR 536 PADA PT X Candra Damis Widiawaty; Averoes Syahputra Agil; Bayu Chandra Hangesthi
Jurnal Poli-Teknologi Vol. 18 No. 3 (2019)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v18i3.2393

Abstract

In the production process at PT X, such as casting process, required raw material in the form of casting sand. The sand transport process is done by a machine called a Bucket Elevator. The current condition of Bucket Elevator at Plant 2 PT X had some problems on its design due to the initial modification process to the machine that were deliberately done in order to ease the process of troubleshooting and repair on the machine to adjust the height of the drum shaft supported by the bearing, however, the modification causes a sand leak that impacted the lifetime of the bearing. The damage that occurs to the bearing of the Bucket Elevator can slow the production process at PT X down, which lasts between 120 hours to 134 hours per week. Therefore, it is necessary to modify the design of the Bucket Elevator machine in order to stop the sand leakage and be able to work optimally. The design modifications made, are changes to the shaft height adjusting mechanism of the Bucket Elevator 536 drum machine by providing a lock to minimize the leakage of sand that occurs and replace the bearing type to the type that is equipped with a seal to prevent the entry of sand into the bearings. The result of this modification can extend the lifetime bearing, thereby reducing production costs due to bearing replacement, and easing the troubleshooting and repairing process of the engine to adjust the height of the drum shaft supported by the bearings.
ANALISA KEKUATAN WELDING REPAIR BAJA AISI 420 DENGAN METODA GMAW Cecep Slamet Abadi; Rosidi Rosidi; Idrus Assagaf
Jurnal Poli-Teknologi Vol. 18 No. 3 (2019)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v18i3.2396

Abstract

Welding technology is used because besides being easy to use, it can also reduce costs so it is cheaper. Especially for welding repair. From the welding repair the extent to which the strength of GMAW welds can repair components from the molded plastic mold room made of AISI 420 stainless steel. Repair of the print room components using deposit welding is tested using tensile strength and hardness as realization of resistance when holding the rate of liquid plastic entering the print room by 25 to 40 MPa, depending on the plastic viscosity, the precision of the mold and the filling level of the print room. Deposition welding method as a welding repair can affect a procedure to be able to produce a component that is safe and capable of being used in accordance with the provisions. The welding process used is reverse polarity GMAW DC with 125 A current and ER 70 S welding wire diameter 1.2 mm. Test material AISI 420. Tests carried out were tensile test, impact test and hardness test in weld metal, HAZ and base metal. From the Charpy impact test and tensile test obtained the value of welding strength which is close to the strength of the complete object, which is equal to 65%. The energy absorbed by the impact test object with GMAW welding is 5.4 Joule while for the whole test object is 8.1 Joule. The welding tensile strength is 520 MPa compared to the tensile tensile strength of 820 MPa.
RANCANG BANGUN APLIKASI MANAJEMEN GUDANG SUKU CADANG ALAT BERAT PNJ Abdul Azis Abdillah; Muhammad Toby Adigunanugraha; Ivana Bianca
Jurnal Poli-Teknologi Vol. 18 No. 3 (2019)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v18i3.2397

Abstract

Heavy Equipment Study Program, Jakarta State Polytechnic, has a warehouse that aims to store spare parts. These spare parts are used to meet the practical needs of students when lectures take place every semester. During this time, to lend and report spare parts, heavy equipment warehouse technicians still use forms and spare parts cards. This method is less effective when the stakeholders such as the Head of Workshop and Head of Study Program want to know the amount of spare parts stock that is still owned by the warehouse or data warehouse cannot be seen in real time. From these problems, the warehouse needs a way to speed up the process. One method that can be used to overcome this problem is to create a web-based system or application that can carry out an inventory, record, process, and report the spare parts data contained in the heavy equipment warehouse. This writing aims to design and build warehouse management applications for heavy equipment spare parts. So, with this web-based application, stake holders can view reports from the warehouse with the right target, accurate, and efficient.
PENGARUH LEBAR SUDUT MANGKOK TERHADAP UNJUK KERJA TURBIN KINETIK Ujiburrahman Ujiburrahman; Rudy Soenoko; Moch. Agus Choiron
Jurnal Poli-Teknologi Vol. 18 No. 3 (2019)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v18i3.2398

Abstract

Power and efficiency are parameters that show the performance of a kinetic turbine. Previous studies have shown various factors such as flowrate, dimensions and geometry of kinetic turbines are variables that affect the magnitude of power and efficiency. In an effort to improve the performance of kinetic turbines it takes a deep understanding of the factors that influence it. Therefore the purpose of this study was to determine the effect of width variations of bowl blades on kinetic turbine performance. The method used in this study was real experimental on a laboratory scale. Tests were carried out on vertical shaft kinetic turbines with blade width variations of 8 cm, 9 cm and 10 cm. Each turbine is tested on variations of water discharge 45 m3/h, 50 m3/h, 55 m3/h, 60 m3/h and 65 m3/h and in rotation of 80 rpm. The results showed that the width of the bowl affected the performance of the kinetic turbine where the width of the 10 cm bowl blade had a higher performance than the width of the bowl blade 8 cm and 9 cm. The highest performance of kinetic turbines in the variation of the width of the 10 cm bowl blade was obtained at discharge conditions of 65 m3/h. In these conditions the power produced by the kinetic turbine is 12.98 Watts and the efficiency is 35.72%.
Peningkatan Kualitas Lingkungan Daerah Aliran Sungai Solo Berbasis Interactive Participation Rr Diah Nugraheni Setyowati
Jurnal Poli-Teknologi Vol. 19 No. 1 (2020)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v19i1.2401

Abstract

The river has a strategic role as a buffer for people's life so that the quality of the river affects surrounding environment. The development in various fields was a change in land use and environmental damage that caused a decrease in the hydrological function of the watershed and a decrease in environmental quality. The decline in environmental quality has not received special attention from both the government and the surrounding community, therefore an effort to improve the quality of the environment based on interactive participation is needed. The method used in this research is descriptive qualitative, so that in the analysis of problems and making models which are the final results of the study will be based on qualitative analysis. The research phase starts with the identification of the problem, then continues the process of collecting primary and secondary data. After the data is fulfilled, an analysis process is carried out which results in a simple design of an interactive participation-based community empowerment model. Based on the results of data analysis, the Solo DAS is in a critical condition, where the conditions describe the number of hydrological disasters that occurred. Land use in Solo watershed has changed, currently, the land is dominated by rice fields (irrigation and rainfed), gardens, fields and settlements. The maximum daily rainfall in Solo watershed is around 73 - 186 mm/ day, supported by relatively flat landforms, so it can be concluded that the Solo watershed is a flood-prone area. From the results of data analysis, it was also found that the higher the level of education, the higher the level of awareness in maintaining and improving the quality of the environment. The level of community education in the Solo DAS is quite good, so that appropriate community empowerment is interactive participation. The great opportunity for the community to be directly involved shows that the appropriate model of interactive participation empowerment is the Bottom Up model.
Pengaruh Karakteristik Pekerjaan Dan Stres Kerja Terhadap Keinginan Pindah Tempat Kerja Pada Pekerja Proyek Konstruksi Fajar Susilowati; Tri Widya Swastika
Jurnal Poli-Teknologi Vol. 19 No. 1 (2020)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v19i1.2402

Abstract

Human resources are seen as an essential asset in a company because man is a dynamic resource and always needed in every process of production of goods and services. Therefore, this research was performed to analyze the influence of Jobs’ Characteristics and Work Stress on Turnover Intention. This research uses Quantitative Data by Questionnaire Method. The result of data processing shows that Work Stress has a stronger influence on Turnover Intention than Jobs Characteristics. Both of these variables impact amounted to 0.65 of the employee turnover intentions. It can calculate that determination coefficient 42.3%, which means that the variable Jobs Characteristic and Work Stress have contributed amounted to 42.3% of the employee turnover intentions, while other variables determine 57.7%. The indicator most influence on turnover intention in construction employees was the differences in value between the company and its employees. 
STUDI NUMERIK RANCANGAN ALAT PENYEDOT MERKURI PADA MESIN PEMBUAT BOHLAM DITINJAU BERDASARKAN HEAT TRANSFER Joko Jumiyanto; Sutrisno Sutrisno; Prajitno Prajitno
Jurnal Poli-Teknologi Vol. 18 No. 3 (2019)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v18i3.2411

Abstract

The purpose of this study is to observe the pattern of fluid flow on a bulb making machine. The design problem of a mercury suction device is some of the mercury and the exhaust heat from the chimney is sucked in imperfectly towards the outlet. These imperfections occur due to the chimney design and power at the outlet fan. Variations in speed at the bulb-making machine outlet are the most effective looking simulation. CFD simulation is done using fluent ansys. The results of the simulation show the heat transfer phenomenon that occurred. At a speed of 6 m/s the maximum heat air produced is 30.5C. The speed variation in the most effective bulb making machine in this study is 15 m/s. because the surrounding air is almost close to initial temperature which is equal to 27.7C. Keep in mind that by increasing the speed value it will reduce the level of efficiency of the tool.

Page 33 of 41 | Total Record : 410

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