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All Journal JURNAL SeMaRaK Jurnal Pengendalian Pencemaran Lingkungan (JPPL) JIKEM: Jurnal Ilmu Komputer, Ekonomi dan Manajemen KomunikA Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Dinamika Pertanian Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan Mars: Jurnal Teknik Mesin, Industri, Elektro dan Ilmu Komputer
Saipul Bahri
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Library & Information Science Social Sciences

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Pengaruh Diameter Nozzle dan Temperatur Pemanasan Mesin Ekstruder Sampah Plastik Hdpe terhadap Laju Produksi dan Keseragaman Diameter Filamen Saipul Bahri; Nurlia Pramita Sari; Moh Hartono; Agus Harijono
Mars : Jurnal Teknik Mesin, Industri, Elektro Dan Ilmu Komputer Vol. 3 No. 4 (2025): Agustus : Jurnal Teknik Mesin, Industri, Elektro Dan Ilmu Komputer
Publisher : Asosiasi Riset Teknik Elektro dan Informatika Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/mars.v3i4.967

Abstract

Plastic waste, particularly High-Density Polyethylene (HDPE), poses a serious threat to the environment due to its extremely long decomposition time. One effective recycling method is the extrusion process, in which process parameters such as nozzle diameter and heating temperature significantly affect the production rate and the quality of the resulting filament. This study aims to analyze the effect of nozzle diameter and heating temperature on the production rate and diameter uniformity of recycled HDPE plastic filament. The method used is an experimental approach with a quantitative design, utilizing a single-screw type extruder machine. The tested parameter variations include two nozzle diameters (1.75 mm and 2.85 mm) and three temperature levels (200°C, 240°C, and 280°C). The results of the analysis, using factorial ANOVA and control charts, show that both parameters significantly influence production performance. The highest production rate, approximately ±1.0 kg/hour, was achieved with the 2.85 mm nozzle and 280°C temperature combination, while the combination of the 1.75 mm nozzle and 200°C temperature produced the most consistent filament diameter and the best quality, with a resulting diameter of 2.84 mm, which is very close to the target of 2.85 mm. Higher temperatures increase flow rate due to decreased viscosity, but also carry the risk of thermal degradation. This study provides practical guidelines for optimizing the HDPE recycling process through extrusion.
Pengaruh Current Ratio Dan Debt To Equity Ratio Terhadap Return On Equity Pada Pt Sepatu Bata Tbk Tahun 2012-2022 Saipul bahri; Anum Nuryani
JURNAL SeMaRaK Vol. 8 No. 2 (2025): JURNAL SeMaRaK
Publisher : Universitas Pamulang

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Abstract

Penelitian ini bertujuan untuk mengetahui Pengaruh Current Ratio (CR) dan Debt to Equity Ratio(DER) terhadap Return On Equity (ROE) pada PT Sepatu Bata Tbk Periode 2012-2022. Sampelyang digunakan yaitu dari laporan keuangan tahunan (laporan laba rugi dan laporan posisikeuangan). Teknik analisis data mengunakan uji asumsi klasik, uji regresi linier berganda dan ujihipotesis dengan menggunakan aplikasi SPSS 26. Hasil penelitian menunjukkan bahwa secaraparsial Current Ratio tidak berpengaruh signifikan terhadap variabel Return On Equity dengannilai thitung sebesar 2,155 < dari ttabel 2,365 dengan nilai signifikan 0,068 > dari 0,05. Debt to EquityRatio secara parsial tidak berpengaruh dan tidak signifikan terhadap Return On Equity dengannilai thitung sebesar 1,629 < dari ttabel 2,365 dengan nilai signifikan 0,147 > dari 0,05. Berdasarkanuji simultan Current Ratio dan Debt to Equity Ratio tidak terdapat pengaruh yang signifikanterhadap Return On Equity dengan nilai Fhitung sebesar 2,392 < Ftabel 4,74 dengan nilai signifikasi0,162 > 0,05.
ANALISIS USAHATANI PADI SAWAH DI DESA JAYAPURA KECAMATAN BUNGARAYA KABUPATEN SIAK PROVINSI RIAU Ria Diana Dewi Indriyanti; Khairizal; Saipul Bahri
DINAMIKA PERTANIAN Vol. 41 No. 3 (2025): Jurnal Dinamika Pertanian Edisi Desember 2025
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/dp.2025.vol41(3).27372

Abstract

This study aims to analyze production costs, output, revenue, income, and the efficiency of rice farming in Jayapura Village, Bungaraya District, Siak Regency, Riau Province. The study was conducted over six months, from December 2023 to May 2024, using a survey method. The study population consisted of 137 rice farmers, and a sample of 30 was selected using simple random sampling. The data used included primary and secondary data, which were then analyzed descriptively to calculate production costs, income, and business efficiency levels using the Return Cost Ratio (RCR) approach. The research results show that the average total production cost per plot per planting season is IDR 12,302,408, consisting of fixed costs of IDR 136,961 and variable costs of IDR 12,165,447, with the most significant components being fertilizers (41.54%) and labor costs (34.84%). The average production reaches 2,400 kg per plot per planting season with a selling price of IDR 8,500/kg, resulting in gross income of IDR 20,400,000 and net income of IDR 8,097,592 per plot per planting season. The RCR value of 1.66 indicates that every IDR 1.00 of cost incurred generates IDR 1.66 in income, suggesting that rice farming in the study area is efficient and feasible for sustainable development..
Co-Authors Ade Yulia Astuti Agus Harijono Anum Nuryani Darus Darus Dhau Aprilia Hakim Didi Sunantara Ediwarman Ediwarman Endang Wijayanti Haddad Alwi Syihab Ita Irawati Khairizal Khairunnisa Syakira Limetry Liana Meta Aprilia Saputri Moh Hartono Mohammad Ryan Wahyudi Mukhtar Ahmad Nuraina Nabilah Nurlia Pramita Sari Rangkuti, Mohammad Ridwan Ria Diana Dewi Indriyanti Romi Novriadi Siregar, Abdul Rahman Maulana Sri Agustatik T Iskandar Johan Tibrani Tibrani Ujang Paman Ismail Winda Kustiawan