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All Journal Justek : Jurnal Sains Dan Teknologi CHEESA: Chemical Engineering Research Articles AXIOM : Jurnal Pendidikan dan Matematika MAJAMATH: Jurnal Matematika dan Pendidikan Matematika Sang Pencerah: Jurnal Ilmiah Universitas Muhammadiyah Buton Jurnal Review Pendidikan dan Pengajaran (JRPP) JURNAL ANALIS LABORATORIUM MEDIK Jurnal Riset Teknologi Pencegahan Pencemaran Industri REACTOR : Journal of Research On Chemistry And Engineering Jurnal Pendidikan dan Teknologi Indonesia Jurnal Pengabdian Kepada Masyarakat Jurnal Sains dan Teknologi Journal of Engineering Science and Technology International Journal of Applied Research and Sustainable Sciences (IJARSS) Jurnal Pengabdian Masyarakat dan Riset Pendidikan
Dimas Frananta Simatupang
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Sintesis Biooil dari Limbah Pelepah Kelapa Sawit Berbasis Metode Pirolisis Hendra Saputra; Ahdiat Leksi Siregar; Rahma Yusni Oktavia; Dimas Frananta Simatupang
REACTOR: Journal of Research on Chemistry and Engineering Vol 4, No 1 (2023): Published in June 2023
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v4i1.68

Abstract

Biooil is a liquid obtained from cracking lignocellulose structures into simpler compounds from the pyrolysis process. The lignocellulose content in palm midrib can be used as a raw material for making biooil. This study examines the effect of the length of time burning at a temperature of 250 ℃ on the physical and chemical characteristics of the resulting biooil. The independent variable was pyrolysis time with 1 hour, 2 hours, and 3 hours. The parameters used to determine the quality of biooil are specific gravity, pH, color, and composition of biooil by GC-MS instrument. From the results obtained, the highest yield of biooil was 7.9945% from sample with 2 hours pyrolysis time. The quality of biooil showed the average pH ranged between 2.65–3.08 and the average density ranged from 1.0485 to 1.1055. The visual of biooil was dark brown color with the largest biooil content being Cis-Vaccenic acid.
SIGNIFIKANSI HASIL BELAJAR MAHASISWA VOKASI TERHADAP MATA KULIAH MATEMATIKA TEKNIK DENGAN PEMBELAJARAN DARING DAN LURING Anna Angela Sitinjak; Dimas Frananta Simatupang
AXIOM : Jurnal Pendidikan dan Matematika Vol 12, No 1 (2023)
Publisher : Universitas Islam Negeri Sumatera Utara Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30821/axiom.v12i1.11547

Abstract

Masa pandemi Covid-19 memberikan dampak terhadap pendidikan, namun segera diberikan solusi yaitu diberlakukannya pembelajaran daring (dalam jaringan), yang pada awalnya sangat menarik bagi mahasiswa, namun dengan adanya berbagai kendala yang dihadapi membuat masyarakat memiliki dua pandangan yang berbeda yaitu ada yang setuju terhadap metode pembelajaran daring dan ada juga yang menginginkan pembelajaran luring (luar jaringan). Tujuan penelitian ini adalah untuk mengetahui bagaimana hasil belajar mahasiswa vokasi khususnya mahasiswa politeknik jenjang diploma tiga dengan kedua teknik pembelajaran tersebut dan apakah terjadi perbedaan antara keduanya. Jika terjadi perbedaan, akan dilihat mana yang lebih tinggi hasil belajarnya sehingga dapat dijadikan referensi bagi pemangku jabatan dalam menjawab sistem pendidikan online dapat digunakan atau tidak pada pendidikan vokasi. Metode penelitian yang digunakan dalam penelitian ini adalah quasi-eksperimen yang terdiri dari 2 kelompok dengan jumlah mahasiswa setiap kelompok sebanyak 39 orang yang diambil dengan teknik cluster random sampling. Data penelitian kemudian dianalisis lebih lanjut dengan uji normalitas dan homogenitas. Kemudian dilakukan uji-t untuk melihat perbedaan keduanya secara signifikan. Hasil penelitian menunjukkan bahwa hasil belajar dengan teknik pembelajaran luring lebih tinggi daripada hasil metode pembelajaran daring, dengan nilai thitung (0,237) > ttabel (0,223). Hal ini dapat disimpulkan bahwa secara statistik terdapat perbedaan antara teknik pembelajaran luring dan daring pada mata kuliah matematika teknik di pendidikan vokasi. AbstractThe Covid-19 pandemic had an impact on education, but a solution was immediately given, namely the implementation of online learning (distance learning), which was initially very attractive to students, but with the various obstacles, the community had two different views, namely, those who prefer online learning methods and those who prefer offline learning (face-to-face classroom). The purpose of this study was to find out the learning outcomes of vocational students, especially polytechnic students in the D3 level (a level three diploma), learning through online and offline classes and whether there are differences between the two ways of learning. If there is a difference, it will be seen which has better learning outcomes so that it can be used as a reference for stakeholders in deciding whether the online education system can be used or not in vocational education. This study follows a quasi-experimental method consisting of 2 groups with a total of 39 students in each group taken using a cluster random sampling technique. The research data were then analyzed further with normality and homogeneity tests. Then a t-test was carried out to see a significant difference between the two. The results of the study show that learning outcomes with offline learning techniques are better than those of online learning methods, with t-count (0.237) > t-table (0.223). It can be concluded that statistically there are differences between offline and online learning techniques in engineering mathematics courses in vocational education.
ANALISIS TINGKAT KEMAMPUAN PEMECAHAN MASALAH PESERTA DIDIK KELAS X SMA PADA MATERI SUHU DAN KALOR Merta Simbolon; Selestina Kostaria Jua; Dimas Frananta Simatupang
Jurnal Review Pendidikan dan Pengajaran Vol. 7 No. 2 (2024): Volume 7 No. 2 Tahun 2024
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jrpp.v7i2.26781

Abstract

Penelitian ini bertujuan untuk menganalisis tingkat kemampuan pemecahan masalah peserta didik SMA pada materi suhu dan kalor. Subjek penelitian ini adalah peserta didik kelas X salah satu SMA di kota Merauke yang berjumlah 30 orang. Metode yang digunakan dalam penelitian ini bersifat deskriptif dan data diperoleh dengan memberikan instrumen berupa tes kemampuan pemecahan masalah. Adapun instrumen yang digunakan adalah instrumen kemampuan pemecahan masalah berbasis multimodus representasi Rosengrant yang telah dikembangkan peneliti dan telah diuji validitas dan reliabilitasnya sehingga dinyatakan layak untuk digunakan sebagai instrumen tes. Selain itu, wawancara juga dilakukan terhadap guru sebagai data pendukung. Hasil yang diperoleh menunjukkan bahwa tingkat kemampuan pemecahan masalah peserta didik pada tahap 1 dan tahap 4 lebih baik daripada tahap 2 dan tahap 3.
Determination of Cooling Water Requirement for Plastic Film Extrusion Process at PT. XYZ North Sumatra Paranita, Darni; Donda, Donda; Simatupang, Dimas Frananta
Justek : Jurnal Sains dan Teknologi Vol 6, No 4 (2023): Desember
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v6i4.20319

Abstract

Abstract:  The cooling water is a liquid medium used to cool down plastic film after it undergoes melting in the plastic film extrusion process. This research aims to determine the required amount of cooling water needed to cool the plastic film before it enters the cutting process. The research method involved collecting primary data from the factory and determining the heat and cooling water requirements using thermodynamic equation calculations. The results indicate that a flow rate of 475 kg/hour of plastic film releases heat into the cooling water at an average rate of 19175.9043 kcal/hour, with an average cooling water requirement of 983.366925 L/hour.Abstrak: Air pendingin merupakan media cairan yang digunakan untuk pendinginan film plastik setelah mengalami peleburan pada proses ekstrusi film plastik. Penelitian ini dilakukan dengan tujuan untuk menentukan jumlah air pendingin yang diperlukan untuk mendinginkan film plastik sebelum nantinya masuk ke dalam proses pemotongan. Metode penelitian dengan pengumpulan data primer dari pabrik dan menenetukan panas serta kebutuhan air pendingin dengan kalkulasi persamaan termodinamika. Hasil menunjukkan bahwa sebanyak 475 kg/jam laju alir kapasitas film plastik melepas panas ke air pendingin dengan rata-rata sebesar 19175,9043 kkal/jam dengan kebutuhan air pendingin rata-rata sebesar 983,366925 L/jam.
Analysis of Pressure Loss for Treatment Process of Demineralized Water at the Water Treatment Plant Unit at PT. ABC North Sumatra Donda, Donda; Paranita, Darni; Simatupang, Dimas Frananta
Justek : Jurnal Sains dan Teknologi Vol 7, No 1 (2024): Maret
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v7i1.20412

Abstract

Abstract: For the demineralized water treatment process, the water from the Portable Water Pound is pumped to the Reverse Osmosis system by a centrifugal pump. The pump provides the necessary force for the fluid to reach the Reverse Osmosis system. In a piping system, fluid flow in water treatment industries experiences pressure drop. The objective of this research is to determine the pressure loss and Reynolds number. The method includes calculating flow rate, Reynolds number, and pressure loss. The research results indicated that in a pipe diameter of 15 cm with a total pipe and fitting length of 5.0303 m, the average Reynolds number with an average fluid flow rate of 20.8 m3/hour was 61,411.46 (turbulent flow). Meanwhile, in a 10 cm diameter pipe with a total pipe and fitting length of 27.2228 m and the same average fluid flow rate, the Reynolds number was 86,671.40 (turbulent flow). The total pressure loss obtained at a temperature of 32°C is 323,382.68 Pa. The water flow rate has a positive relationship with the pressure loss in the pipe. The higher the flow rate, the greater the pressure loss. The Reynolds number also increases with the flow rate, indicating that higher flow rates result in higher Reynolds numbers and turbulence in the flow.Abstrak: Untuk proses pengolahan air demineral, air dari Portable Water Pound yang dipompakan menuju Reverse Osmosis membutuhkan tenaga yang diberikan oleh pompa. Pompa yang digunakan ialah pompa sentrifugal. Air yang dipompakan menuju Reverse Osmosis membutuhkan tekanan dari pompa sentrifugal tersebut agar fluida bisa sampai ke dalam Reverse Osmosis. Dalam suatu sistem perpipaan, aliran fluida dalam industri pengolahan air mengalami penurunan tekanan. Tujuan dari penelitian ini adalah untuk menentukan kehilangan tekanan dan bilangan Reynold. Metode yang digunakan meliputi perhitungan debit aliran, bilangan Reynolds, dan kehilangan tekanan. Hasil penelitian menunjukkan bahwa pada diameter pipa 15 cm dengan panjang pipa dan fitting 5,0303 m menghasilkan rata-rata bilangan Reynold dengan debit fluida rata-rata sebesar 20,8 m3/jam sebesar 61.411,46 (turbulensi). Sementara itu, pada diameter 10 cm dengan panjang pipa dan fitting 27,2228 m menghasilkan rata-rata bilangan Reynold dengan debit fluida yang sama sebesar 86.671,40 (turbulensi). Kehilangan tekanan total yang diperoleh pada suhu 32 0C adalah sebesar 323.382,68 Pa. Debit aliran air memiliki hubungan positif dengan kehilangan tekanan dalam pipa. Semakin tinggi debit aliran, semakin besar kehilangan tekanan yang terjadi. Bilangan Reynolds juga berbanding lurus dengan debit aliran, yang menunjukkan bahwa semakin besar debit aliran, semakin besar pula nilai Reynolds dan aliran akan mengalami turbulensi.
Penentuan Kebutuhan Poli Aluminium Klorida pada Proses Penjernihan Air di Unit Water Treatment PT. XYZ Kuala Tanjung Nelza, Novia; Sebayang, Mariani; Yunianto; Simatupang, Dimas Frananta
INSOLOGI: Jurnal Sains dan Teknologi Vol. 2 No. 6 (2023): Desember 2023
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v2i6.2783

Abstract

A Water Treatment Unit (WTU) is a station that works on the processing and conditioning of raw water to meet the desired water quality. Water purification at PT. XYZ Kuala Tanjung uses raw water sourced from surface water or rivers. The river water used still contains solid substances and organic matter that render the water unsuitable for industrial use. Both suspended and colloidal solid substances can cause turbidity. Turbidity caused by solid substances can be addressed using coagulation techniques. The purpose of this research is to determine the optimal concentration and dosage of coagulant to clarify water in the WTU. The coagulant used is polyaluminum chloride (PAC). The research method is based on experiments using jar tests and stoichiometric calculations. The determination of the optimal coagulant is measured based on turbidity parameters. Experiments are conducted with varying concentrations of PAC ranging from 25-65 ppm, and the smallest turbidity value obtained is 1.21 NTU at a PAC concentration of 65 ppm, with a PAC requirement of 202.6679 kg/day. The higher the PAC concentration, the clearer the resulting water, but the daily requirement for PAC also increases.
Determination of Sodium Sulfate Requirement for Obtaining Sodium Sulfide Content in Green Liquor at the Recovery Boiler Unit in PT XYZ North Sumatra Donda; Darni Paranita; Dimas Frananta Simatupang
International Journal of Applied Research and Sustainable Sciences Vol. 1 No. 4 (2023): December 2023
Publisher : MultiTech Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59890/ijarss.v1i4.937

Abstract

Black liquor is a residual cooking liquid containing organic chemicals utilized as fuel in the recovery boiler and inorganic chemicals that can be recovered into cooking liquid through the recovery boiler process. The recovery boiler is a specialized boiler unit used to restore black liquor by reducing sodium sulfate into sodium sulfide. The research method involved field observations, liquor content analysis, and stoichiometric calculations to determine the sodium sulfate requirement. The calculations revealed that the sodium sulfide content obtained from the recovery boiler process in green liquor was 24.428 g/l Na2O, requiring a reactive amount of 46,5225.0328 kg/day of sodium sulfate. The target sodium sulfide content in the green liquor aimed for was 18-30 g/l. The results indicated that the sodium sulfide content has met the predetermined target and can be utilized for subsequent processes.
Fabrication of Biobriquettes from Mixture of Palm Fronds and Palm Shells with Varying Binders of Tapioca and Sago Flour Dimas Frananta Simatupang; Merta Simbolon
International Journal of Applied Research and Sustainable Sciences Vol. 1 No. 4 (2023): December 2023
Publisher : MultiTech Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59890/ijarss.v1i4.1062

Abstract

Biobriquettes are products obtained from the compaction process of biomass residue used as fuel and formed by using a binding agent. In this study, the biomass used comprised palm fronds and palm shells. The objective was to determine the characteristics of biobriquettes. The research methodology adopted was quantitative experimentation. Results showed that the highest calorific value of biobriquettes was 6729.92 cal/g (1:3-sago 15%), the lowest moisture content was 1.1168% (1:3-tapioca 10%), the lowest ash content was 9.5232% (1:3-sago 10%) and the highest density was 0.9927 g/cm3 (1:3-tapioca 20%). Based on the test results, it can be concluded that the optimal ratio of raw materials palm fronds to palm kernel shells for biobriquette fabrication is 1:3 with 10% tapioca flour and 10-15% sago flour as binders.
Calculation of Impurity Levels in SIR 3CV Type Rubber and Mass Balance at the Drying Station in PT. XYZ North Sumatera Ratna Kristina Tarigan; Dimas Frananta Simatupang
International Journal of Applied Research and Sustainable Sciences Vol. 2 No. 1 (2024): January 2024
Publisher : MultiTech Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59890/ijarss.v2i1.1253

Abstract

The quality of latex significantly affects the quality level of rubber produced, with one of its parameters being the impurity level, with a standard value of 0.03%. The impurity level strongly influences the rubber quality, where higher impurity levels correspond to lower rubber quality, and vice versa. The research method employed was experimental and calculation using mass balance. The calculated results indicated impurity levels in the rubber as follows: 0.0059%, 0.0069%, 0.0074%, 0.0419%, 0.0054%, 0.0429%, and 0.0444%. The average total impurity level was 0.0219%. However, some rubber samples did not meet quality standards due to contaminated tapping equipment, inadequate washing processes, and damaged filtration tools. In the mass balance at the drying station, the first input material was 125 kg/hour with a water component balance of 50%, HAS (Hevea Acidic Solution) 12%, SMBS (Sodium Metabisulfite) 8%, and latex 30%. The second input material is 18.75 kg/hour, consisting of 100% steam. The output material at the drying station is 143.75 kg/hour, with a water component balance of 43.47%, HAS 10.43%, SMBS 6.95%, latex 26.08%, and steam 13.07%.
Red Palm Oil from Crude Palm Oil Refinement Using The Acid Degumming Method Hendra Saputra; Azhar Basyri Rantawi; Ahdiat Leksi Siregar; Istianto Budhi Rahardja; Dimas Frananta Simatupang
International Journal of Applied Research and Sustainable Sciences Vol. 2 No. 6 (2024): June 2024
Publisher : MultiTech Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59890/ijarss.v2i6.1957

Abstract

Red Palm Oil (RPO) is the result of refining Crude Palm Oil (CPO). In further processing to obtain cooking oil, several processes are undergone to produce a clear oil, which is very different from its original product, CPO. RPO is rich in beta-carotene and its refining process does not include bleaching. The production of RPO utilizes the acid degumming method with different acid variations, namely phosphoric and sulfuric acid, with varying concentrations of 0.05% and 0.075%. The results showed that the average percentage of RPO produced reaches 44.05%. Furthermore, the quality analysis of RPO also meets the SNI-3741-1995 standards (quality standard of cooking oil), with the average of free fatty acid value of 1.41% (max 3%), peroxide value of 1.04 mg oxygen/100 g (max 1.6 mg oxygen/100 g), and moisture value of 0.04% (max 0.3%).
Co-Authors Agrifa, Utami Nanda Ahdiat Leksi Siregar Azhar Basyir Rantawi Azhar Basyri Rantawi Darni Paranita Derry CS Purba Donda Donda Donda, Donda Ginting, Maulidna Hendra Saputra Hendra Saputra Ing Mayfa Situmorang Istianto Budhi Rahardja Jua, Selestina Kostaria Martin Siahaan Merta Simbolon Nelza, Novia Nuranika Nuranika Oktavia, Rahma Yusni Paranita, Darni Purba, Switamy A. Rahma Yusni Oktavia Ramadhani Ramadhani Ratna Kristina Tarigan Ratna Kristina Tarigan Ratna Kristina Tarigan Saragih, Gimelliya Sebayang, Mariani Sidabutar, Naqasya Asyrori Sihaloho, Erwin Dani Winata Simbolon, Merta Siregar, Ahdiat Leksi Sitepu, Evi Christiani Soherawati Rospa Ginting Switamy Angnitha Purba Tampubolon, Ferdinan Rinaldo Wiranda Panggabean Yunianto Yunianto Yunianto