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PENGARUH KOMPOSISI TERHADAP PERILAKU MEMBRAN KOMPOSIT PVA/KITOSAN/GRAFIN OKSIDA YANG TERIKAT SILANG TRISODIUM SITRAT Asadian Puja Enggita
Jurnal Sains dan Seni ITS Vol 4, No 2 (2015)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Membran komposit PVA/kitosan/grafin oksida yang terikat silang tirisodium sitrat telah disintesis. Membran PVA/Kitosan di buat dengan variasi komposisi (1/5; 2/4; 3/3; 4/2; 5/1) diuji dengan TGA dan uji tarik. Membran komposit PVA/kitosan 5/1 menunjukan hasil termal dan mekanik paling bagus sehingga dipakai sebagai komposisi pencampuran variasi grafin oksida. Grafin oksida yang dicampurkan dalam membran PVA/kitosan di variasi (0%; 0,5%; 1%; 1,5%; 2%) m/m. Membran PVA/kitosan/grafin oksida di uji water uptake, methanol uptake, dan konduktivitas proton pada suhu 200C. Hasil water uptake menunjukan membran komposit PVA/kitosan/grafin oksida (0%; 0,5%; 1%; 1,5%; 2%) sebesar 78,18%, 84,13%, 101,25%, 125,61%, 131,45%. Hasil methanol uptake membran komposit PVA/kitosan/grafin oksida (0; 0,5; 1; 1,5; 2%) sebesar 119,38%, 105,97%, 102,97%, 102,76%, 102,83%.

Analysis on Queue System at Vitka Point Gas Station Number 14.294.722 on Motorcycle Line with Pertalite-Based Fuel Bima Wahyu Pratama; Fandy Bestario Harlan; Adhitomo Wirawan; Asadian Puja Enggita
JURNAL AKUNTANSI, EKONOMI dan MANAJEMEN BISNIS Vol 10 No 1 (2022): Jurnal Akuntansi, Ekonomi dan Manajemen Bisnis - Juli 2022
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jaemb.v10i1.4055

This study aims to find out the performance of the queuing system at SPBU 14.294.722 Vitka Poin, Batam City on Pertalite fuel for motorcycles. The performance of the queuing system was analyzed to whether it has reached the optimal level. The data were collected through interviews and observations. Then, the obtained data were analyzed using a single line queuing system (single-channel, single-phase). The study used quantitative data in which the calculation was assisted by the "POM-QM Queuing Analysis" software. Based on the result of the single-channel single-phase analysis, the performance of the queuing system applied by the 14.294.722 Vitka Poin, Batam City gas station is optimal. It is because the server utilization level or the average operator's busyness level for 7 days is 72.11 %, and the remaining 27.89% of the busy time is idle time, which is the time when the service is not performed. Meanwhile, the effectiveness of performance at the 14.294.722 Vitka Poin, Batam City gas stations is quite good by referring to the average time required by customers in the queue which is only 0.0139 hours or 0.8322 minutes, and the time required by customers in the system is 0.0192 hours or 1.1541 minutes, and the average number of customers waiting in the queue is only 1.846 or 2 people and the average number of customers waiting in the system is 2.5857 or 3 people. The results indicate that there is no need for additional servers as the performance of using 1 server is quite good.

Pengaruh Penambahan Kalsium Karbonat (CaCO₃) Terhadap Kekerasan Material HDPE/LDPE Enggita, Asadian Puja; Ikhsandy, Ferry; Jaman, Winda Sri; Syafaatullah, Achmad Qodim
REACTOR: Journal of Research on Chemistry and Engineering Vol 6, No 1 (2025): June 2025
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v6i1.179

Plastic waste recycling has been extensively studied, particularly in applications such as paving blocks, asphalt mixtures, and composite boards. One critical parameter affecting the quality of these products is material hardness. This study examines the effect of CaCO₃ addition on the hardness of polymer composite materials. The preparation process involved collecting, washing, drying, sorting, and shredding plastic waste, followed by mixing High Density Polyethylene (HDPE) and Low-Density Polyethylene (LDPE) at a ratio of 1:5. Calcium carbonate (CaCO₃) was added at varying concentrations (0%; 0,5%;1,0%; 1,5%, and 2,0%), and the mixture was melted using an extruder and subsequently molded. The results indicate that the addition of 1,5% CaCO₃ yields the highest and most stable hardness value across three tests, achieving 4,77 HV with a standard deviation of 0,0577. Furthermore, microstructural analysis reveals that up to 1,5% CaCO₃ leads to the most uniform filler distribution, optimizing both hardness and material stability. This study reveals that increasing CaCO₃ concentration enhances composite material hardness when evenly distributed and homogeneous. However, excessive CaCO₃ concentration may result in agglomeration, negatively impacting composite properties.

Perancangan Ulang Saringan Vibration Sieve untuk Pengolahan Limbah Padat: Studi Kasus di PT ABC Enggita, Asadian Puja Enggita; Kurnia, Ganjar; Darmawan, Daffa Athalla
MACHINERY Jurnal Teknologi Terapan Vol. 6 No. 3 (2025): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.17300708

Effective solid waste management is essential to support industrial operations and environmental sustainability. PT ABC faces obstacles in the solid waste screening due to the less-than-optimal performance of the Vibration Sieve, especially in handling additive-lime and masterbatch-resin. This study aims to evaluate the performance of the tool before and after the redesign of the filter, as well as to determine the appropriate filter specifications for each type of waste. The method used is a quantitative approach through observation, measurement, and performance testing of the tool. The results show that a filter with a hole diameter of 6 mm is effective for additives and lime, while a 3 mm filter is effective for masterbatch and resin. After modification, the weight of the filtered waste increased from 3.26 kg to 16.97 kg. This modification has been shown to increase filtering effectivity and reduce waste

Pengaruh Penambahan Kalsium Karbonat (CaCO₃) Terhadap Kekerasan Material HDPE/LDPE Enggita, Asadian Puja; Ikhsandy, Ferry; Jaman, Winda Sri; Syafaatullah, Achmad Qodim
REACTOR: Journal of Research on Chemistry and Engineering Vol. 6 No. 1 (2025)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v6i1.179

Plastic waste recycling has been extensively studied, particularly in applications such as paving blocks, asphalt mixtures, and composite boards. One critical parameter affecting the quality of these products is material hardness. This study examines the effect of CaCO₃ addition on the hardness of polymer composite materials. The preparation process involved collecting, washing, drying, sorting, and shredding plastic waste, followed by mixing High Density Polyethylene (HDPE) and Low-Density Polyethylene (LDPE) at a ratio of 1:5. Calcium carbonate (CaCO₃) was added at varying concentrations (0%; 0,5%;1,0%; 1,5%, and 2,0%), and the mixture was melted using an extruder and subsequently molded. The results indicate that the addition of 1,5% CaCO₃ yields the highest and most stable hardness value across three tests, achieving 4,77 HV with a standard deviation of 0,0577. Furthermore, microstructural analysis reveals that up to 1,5% CaCO₃ leads to the most uniform filler distribution, optimizing both hardness and material stability. This study reveals that increasing CaCO₃ concentration enhances composite material hardness when evenly distributed and homogeneous. However, excessive CaCO₃ concentration may result in agglomeration, negatively impacting composite properties.

Produksi Briket dari Limbah Plastik dan Ampas Tebu dengan Metode Pirolisis Pasaribu, Monita; Sena, Muhammad Arya; Kristiani , Maria; Jaman, Winda Sri; Enggita, Asadian Puja; Supardi, Supardi
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 10 No. 2 (2024): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v10i2.599

Plastic is a polymer product that is widely used in society. This resultx in an increase in plastic waste. Plastic waste processing needs to be done to prevent environmental emissions. Plasstic waste can be converted into an alternative energy source in briquettes. The reasearch object is to produce briquettes from plastic and sugarcane bagasse. Plastic briquettes and bagasse have a ratio of 1:2, 1:1 and 2:1. The second stage is the preparation and design of the tool using the pyrolisis method. Research variables include the composition of plastic waste and sugarcane bagasse. Analysis of briquette products includes calorific value, ash conten and water conten. The results of research on briquette products with variations in sampel A having a ratio of 1:2, sample B with ratio of 1:1 and sample C with a ratio 2:1 respectively show a calorific value of 3,929 cal/g, 4.013 cal/g, 4,222 cal/g; water content values of 8,6%, 6,7%, 5,8%, the ash content value is 5,4%, 7,2% and 8,6% and the volatile matter value is 15.3, 13.2% and 12,6%.

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