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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) Jurnal Ilmu Lingkungan Komunikasi Fisika Indonesia Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Jurnal Sains Matematika dan Statistika JATI UNIK : Jurnal Ilmiah Teknik dan Manajemen Industri Communications in Science and Technology INTECOMS: Journal of Information Technology and Computer Science Matrik : Jurnal Manajemen dan Teknik Industri Produksi Jurnal Perangkat Lunak Jurnal Surya Teknika Journal of Applied Materials and Technology IJIMCE : International Journal of Innovation in Mechanical Construction and Energy
Rika Taslim
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Arts Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics

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Analisis Persediaan Bahan Baku Dengan Menggunakan Metode Economic Order Quantity (EOQ) Dan Period Order Quantity (POQ) Pada Proses Produksi Pintu PVC Di PT. Kencana Inti Andalan (KIA) Satrio, Tedy; Nazaruddin, Nazaruddin; Nofirza, Nofirza; Surayya Lubis, Fitriani; Taslim, Rika
Matrik : Jurnal Manajemen dan Teknik Industri Produksi Vol 24 No 2 (2024)
Publisher : Prodi Teknik Industri Universitas Muhammadiyah Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30587/matrik.v24i2.6739

Abstract

PT. Kencana Inti Andalan adalah perusahaan kontruksi yang menawarkan bahan bangunan untuk proyek pembangunan. Karena permintaan yang tidak stabil atau berfluktuasi, pengendalian persediaan bahan baku PT. Kencana Inti Andalan belum optimal. Akibatnya, stok di gudang berkurang, sehingga proses persediaan bahan baku di perusahaan berkurang. Dengan menggunakan metode Economic Order Quantity (EOQ) dan Period Order Quantity (POQ), tujuan penelitian ini adalah untuk menentukan ukuran pesanan, frekuensi pemesanan, dan biaya total persediaan. Hasil dari Economic Order Quantity (EOQ) adalah 602,80 unit, dengan frekuensi pemesanan 10 kali, dan biaya persedaan sebesar 103.724.993,19362. Hasil dari Period Order Quantity (POQ) adalah 255,41 unit, dengan frekuensi pemesanan sebanyak 24 kali.. Dari kedua metode ini di didapatkan selisih biaya persediaan yang di peroleh EOQ lebih menghemat dari POQ, hal ini di kerenakan biaya pemesanan POQ lebih besr di bandingkan dengan EOQ.
PERENCANAAN PERAWATAN MESIN VACUUM TRUCK MENGGUNAKAN METODE RELIABILITY CENTERED MAINTENANCE (RCM) DAN OVERALL MEASURE OF MAINTENANCE PERFORMANCE (OMMP) Mayuta, Fadhila Putra; Hamdy, Muhammad Ihsan; Lubis, Fitriani Surayya; Harpito, Harpito; Taslim, Rika
INTECOMS: Journal of Information Technology and Computer Science Vol 7 No 4 (2024): INTECOMS: Journal of Information Technology and Computer Science
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/intecoms.v7i4.11024

Abstract

Penelitian ini bertujuan untuk menghasilkan perawatan perbaikan pada vacuum pump kemudian mengukur kinerja perawatan perusahaan serta mengusulkan perbaikan pada indikator yang memiliki kinerja paling rendah. PT. X merupakan perusahaan yang bergerak di bidang jasa penyewaan alat berat. Jasa yang ditawarkan yaitu transportasi drilling di area rig migas. Perusahaan ini menjadwalkan pemeliharaan secara berkala, setiap unit truck telah menempuh jarak 10.000 km. Namun, pemeliharaan tersebut tidak berjalan sesuai yang dijadwalkan. Pemeliharaan banyak tertunda karena perusahaan mendahulukan unit yang rusak untuk perbaikan. Metode RCM dan OMMP digunakan untuk mengetahui komponen kritis mesin dan efektivitas kinerja perusahaan dalam melakukan perawatan. Hasil penelitian ini terdapat 4 komponen yang sering mengalami kerusakan, yaitu crank journal, bearing, seal piston, dan pressure gauge. Untuk kinerja bagian pemeliharaan, dari 14 indikator yang diukur terdapat 8 indikator yang tidak mencapai target perusahaan. Rekomendasi perbaikan yang diberikan yaitu melengkapi SOP perusahaan untuk perawatan dan melakukan penerapan Total Productive Maintenance (TPM). Kata Kunci: Perawatan, Sistem Kerja, RCM, OMMP, Vacuum Pump.
Harnessing multi-doping porous carbon from Musa paradisiaca L. peel waste for solid-state supercapacitors Purba, Cenora Evelynza; Nursyafni, Nursyafni; Apriwandi, Apriwandi; Kresna, Pharada; Julnaidi, Julnaidi; Nasir, Muhammad; Farma, Rakhmawati; Dewi, Rahmi; Martin, Awaludin; Hardanto, Lilik Tri; Taslim, Rika; Taer, Erman
Indonesian Physics Communication Vol 21, No 3 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.3.187-196

Abstract

The demand for low-cost carbons with multi-doping in supercapacitors has led to a significant focus on utilizing biomass waste to produce activated carbons. The research successfully utilized Musa paradisiaca L. (MPL) peel as a porous carbon for solid-state supercapacitor. The process involved collecting banana peel waste, drying the peels using sunlight, pre-carbonization using a furnace, pH neutralization, drying, crushing carbon particles, and ensuring uniform particle size. Different concentrations of the catalytic ZnCl2 solution (300, 500, and 700 mmol/g) were selected to optimize physical and electrochemical properties. The resulting chemically activated MPL carbon powder was evaluated using SEM-EDS, XRD, and BET. MPL activated carbon with a 500 mmol/g solution of ZnCl2 was found to have optimal physical properties with a carbon percentage of 81.65%, oxygen 17.39%, phosphorus 0.42%, and boron 0.52%. Electrochemical properties were evaluated using dual-electrode system was exhibited the highest specific capacitance of 67 F/g. These findings demonstrate the potential of MPL peel waste as a high quality electrode for supercapaicor next-generation.
Wear Analysis and Corrective Maintenance Worm Screw Press at PT. XYZ Ihsan Hamdy, Muhammad; Taslim, Rika; Andhen Sury, Nyvia
IJIMCE : International Journal of Innovation in Mechanical Construction and Energy Vol. 1 No. 1 (2024): IJIMCE : International Journal of Innovation in Mechanical Construction and Ene
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/ijimce.v1i1.18

Abstract

PT. XYZ is one of the palm oil processing companies located in the Riau area. The purpose of this study was to determine the right type of machine maintenance, especially for the worm screw press, because this part often experiences wear and tear which affects the results of pressing palm oil into oil. Wear and tear can partially reduce the surface of the machine and affect the performance of each machine. The service life of the worm screw press provided by the manufacturer is 1000 hours. However, usage at the Sebanga Multi Sawit factory reaches 1300-1500 hours. This proves that there is a need for further studies on good maintenance methods on screw press machines. The calculation of the wear rate and the depth of wear is used to determine the amount of wear that occurs. Solutions that can be done are welding, pack carburizing, and flame hardening on the worm screw press.
Novel colored biomass-waste from food industry sector derived hierarchical porous carbon nanofiber for robust symmetric supercapacitor Nursyaputri, Wan Mery; Fairuzy, Zeeva Khalilah; Khumairah, Zahra; Yanti, Novi; Nursyafni, Nursyafni; Apriwandi, Apriwandi; Taslim, Rika; Taer, Erman
Communications in Science and Technology Vol 9 No 2 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.2.2024.1534

Abstract

A major challenge in the use of supercapacitor energy storage applications is optimizing 3D-hierarchical porous and 2D nanofiber structures to improve the electrochemical performance of colored biomass-derived activated carbon (AC). Therefore, this study aims to synthesize AC from Dracaena Angustifolia (DA) leaves and dregs using a sustainable method through chemical activation and high-temperature pyrolysis. AC was designed to be adhesive-free to maintain the true mechanical properties of the precursor. Research results showed that the sample of DA-dregs-KOH shows optimal results with a specific surface area (317.66 m2 g-1). The electrochemical performance of hierarchical porous carbon treated with 1 M H2SO4 electrolyte in a 2-electrode system had a nanofiber structure with the highest specific capacitance (248 F g-1) at 1 A g-1 and energy density (12.96 Wh kg-1) with a coulomb efficiency 84.1%. Based on these results, DA dreg-KOH based porous AC with hierarchical porous morphology shows significant potential to be used as binder-free electrode materials that can produce high-performance supercapacitors as a new renewable and sustainable energy storage solution.
Assessment of Status and Sustainability Index for Smallholder Rubber Plantation in Riau Province of Indonesia Azwar, Budi; Andrini, Rozi; Hamdalah, Ahmad; Norhiza, Fitra Lestari; Taslim, Rika; Muhammad, Juandi
Jurnal Ilmu Lingkungan Vol 23, No 1 (2025): January 2025
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.23.1.208-217

Abstract

The conversion of rubber plantation to oil palm cultivation in Riau province is raising concerns regarding the decline of rubber commodity. Historically, the province has been a key producer of such commodity in Indonesia. The community-owned rubber plantation, on the other hand, is diminishing, leading to a troubling cycle that makes it difficult to establish environmentally sustainable programs. Therefore, this research aimed to assess sustainability of smallholder rubber plantation in Riau. It was observed that the comprehensive RapRubber analysis yielded an index of 39.76, classifying status as less sustainable. The results showed that the management of rubber plantation was under pressure. In a more detailed analysis, the ecological dimension had an index of 43.22, placing it in the less sustainable category. The economic dimension scored 50.80, signifying a relatively sustainable status. In contrast, the social dimension reduced with an index of 25.25, classifying it as less sustainable. The attributes that contributed to the unsustainability of the ecological dimension were fire frequency and by-products, while the factors contributing to less sustainability of the social dimension included the initial land-clearing methods, preservation practices, and local wisdom. In the economic dimension, land status and pricing were essential determinants of sustainability.
ANALISIS PENGUKURAN BEBAN KERJA FISIK TERHADAP OPERATOR MESIN BORDIR MENGGUNAKAN METODE NORDIC BODY MAP (NBM) DAN METODE RAPID ENTIRE BODY ASSESMENT (REBA) Gunawan, Resky; Nazaruddin; Nur, Muhammad; Suraya Lubis, Fitriani; Taslim, Rika
JURNAL PERANGKAT LUNAK Vol 7 No 1 (2025): JURNAL PERANGKAT LUNAK
Publisher : Indragiri Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32520/jupel.v7i1.3921

Abstract

Penelitian ini bertujuan untuk menganalisis beban kerja fisik operator mesin bordir di Elteka Konveksi dengan menggunakan metode Nordic Body Map (NBM) dan Rapid Entire Body Assessment (REBA). Metode ini dipilih untuk mengidentifikasi dan mengevaluasi risiko ergonomis yang dihadapi oleh pekerja, serta untuk memberikan rekomendasi perbaikan yang dapat meningkatkan kenyamanan dan produktivitas kerja. Pengumpulan data dilakukan melalui observasi langsung dan wawancara dengan operator, yang bertujuan untuk mendapatkan informasi mendalam mengenai postur kerja dan keluhan fisik yang dialami. Hasil analisis menunjukkan bahwa terdapat beberapa faktor yang berkontribusi terhadap beban kerja yang tinggi, termasuk postur kerja yang tidak ergonomis dan durasi kerja yang panjang. Berdasarkan hasil evaluasi, disarankan untuk melakukan perbaikan pada desain tempat kerja dan memberikan pelatihan ergonomi kepada pekerja. Penelitian ini diharapkan dapat memberikan kontribusi positif bagi Elteka Konveksi dalam meningkatkan sistem kerja dan kesejahteraan karyawan
Analisis Persediaan Bahan Baku Roti Menggunakan Inventori Probabilistik Back Order dan Lost Sales Okti, Okti Wardani; Surayya Lubis, Fitriani; Suherman; Muhammad Nur; Taslim, Rika
JURNAL SURYA TEKNIKA Vol. 10 No. 1 (2023): JURNAL SURYA TEKNIKA
Publisher : Fakultas Teknik UMRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jst.v10i1.5021

Abstract

UMKM Richard Bakery merupakan UMKM yang memproduksi roti donat original, donat gula, dan lain-lain. UMKM Richard Bakery memiliki kelemahan dalam penyediaan bahan baku. Diantaranya terjadi keterlambatan dalam memenuhi permintaan bahan baku yang diakibatkan oleh ketidakpastian permintaan pasar terhadap produk. Sehingga dalam menyediakan stok bahan baku menjadi terhambat dalam melakukan pendistribusian dan mengalami kesulitan dalam memenuhi permintaan pasar yang tidak pasti terhadap produk roti donat. Metode Inventori Probabilistik dengan Kebijakan Backorder dan Lost sales digunakan untuk mengoptimalkan tingkat pelayanan dan meminimalkan biaya persediaan. Dalam peramalan pemakaian tepung, metode Moving Average dengan periode n = 10 terpilih sebagai metode terbaik dengan nilai MAPE 10,657%. Hasil peramalan menunjukkan permintaan total tepung sebesar 2.919,41 Kg pada tahun 2022. Sedangkan dalam peramalan pemakaian telur, metode Moving Average dengan periode n = 8 terpilih sebagai metode terbaik dengan nilai MAPE 10,2%. Hasil peramalan menunjukkan permintaan total telur sebesar 13.693,41 butir pada tahun 2022. Setelah melakukan peramalan, dilakukan perhitungan biaya bahan baku menggunakan metode inventory probabilistik sesuai dengan situasi perusahaan. Hasil analisis menunjukkan bahwa model persediaan sistem P back order memberikan biaya persediaan yang paling optimum, yaitu Rp 43.930.885 untuk tepung dengan tingkat pelayanan 99,96%, dan Rp 28.289.892 untuk telur dengan tingkat pelayanan 85,57%.
Self-Doped Porous Carbon Derived From Acacia Plantation Residues for Green-Supercapacitor in Sustainable Energy Applications Apriwandi, Apriwandi; Deniza, Rindhu Nabila; Martin, Awaludin; Julnaidi, Julnaidi; Taslim, Rika; Taer, Erman
Journal of Applied Materials and Technology Vol. 7 No. 1 (2025): September 2025
Publisher : AMTS and Faculty of Engineering - Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/Jamt.7.1.1-10

Abstract

To improve bio-organic-carbon quality for supercapacitors, consider using dual or more heteroatom for more profitable carbon-chain doping. Developing suitable sources and preparation strategies is challenging but essential. Herein, we introduce a potential carbon source derived from acacia plantation residues, doped with boron, oxygen, and phosphorus. The pore structure of this carbon material can be precisely tuned to exhibit a well-defined hierarchical arrangement of micro-, meso-, and macropores through a low-ratio of phosphoric acid (H?PO?) impregnation method combined with dual-environment (N2 and CO2) vertical pyrolysis in one step integrated. The resulting material displays a confirmed hierarchical morphology with a hierarchical transformation into tunnel pores, in specific surface area of 521.70 m²/g which contributed to high charge storage and deliverability. Additionally, the material contains significant levels of boron (0.93%), oxygen (9.19%), and phosphorus (0.34%), facilitating a reversible Faradic reaction in the working electrode. Consequently, optimized-electrode achieves a specific capacitance of 198 F/g at 1 A/g in H?SO? electrolyte. In a two-electrode system, records energy density of 14 Wh/kg (1 A/g) at a maximum power density of 670 W/kg (10 A/g). These findings suggest that the natural incorporation of boron, oxygen, and phosphorus enhances both the activity and the hierarchical pore structure of carbon derived from acacia plantation residues.
Integrasi Metode OMAX, AHP, dan HIRA dalam Evaluasi Produktivitas dan Risiko Operasional pada UMKM Tahu Juli Andry; Nazaruddin; Nur, Muhammad; Suherman; Taslim, Rika
JATI UNIK : Jurnal Ilmiah Teknik dan Manajemen Industri Vol. 8 No. 2 (2025): APRIL
Publisher : Industrial Engineering, Engineering of Faculty, Universitas Kadiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/jatiunik.v8i2.6151

Abstract

Productivity is an important indicator in increasing the efficiency and competitiveness of MSMEs, especially in the tofu industry which faces the challenge of production costs and dependence on imported raw materials. This study aims to measure and increase the productivity of the Pak Budi Tofu Factory through the integration of three methods of Objective Matrix (OMAX), Analytical Hierarchy Process (AHP), and Hazard Identification and Risk Assessment (HIRA). The OMAX method is used to assess productivity based on four main ratios, AHP to determine the priority weight of causative factors, and HIRA to identify internal and external risks that affect productivity. The results show fluctuations in the productivity index during 2023, with the highest value in April (176.82%) and lowest in February (-75.69%). AHP showed raw material efficiency as the dominant factor (weight 0.428), while HIRA revealed the main risks in the form of high worker absenteeism, production machine disruptions, and dependence on imported soybeans. This study concludes that the integration of the three methods can provide a comprehensive productivity analysis and support data-driven decision-making in the MSME sector.
Co-Authors Achmad Noerkhaerin Putra Agustino Agustino, Agustino Ahmad Fudholi Andhen Sury, Nyvia Andika Afrianda ANDRINI, ROZI april, Muhammad Dhany Aprilia Pratama Apriwandi Apriwandi . Awaludin Martin Budi Azwar Chitraningrum, Nidya Deniza, Rindhu Nabila Erman Taer Fadli Perdana Yuda Fairuzy, Zeeva Khalilah Fitri Aryani Gunawan, Resky HAMDALAH, AHMAD Hamdy, Muhammad Ihsan Hardanto, Lilik Tri Harpito Harpito, Harpito Hartati , Misra Hasanah, Fainida Ihsan Hamdy, Muhammad Iwantono Iwan Barnawi Juandi Juandi Juli Andry Julnaidi, Julnaidi Khumairah, Zahra Kresna, Pharada Lestari, Fitra Lubis, Fitriani Surayya Lutfi Rindang Lestari Mayuta, Fadhila Putra Melda Riyani Butet Misra Hartati Muhammad Ihsan Hamdy Muhammad Isnaini Hadiyyul Umam Muhammad Nasir Muhammad Nur Muhammad Nur Mustika, Widya Sinta N. Nazaruddin Nazaruddin Nofirza Nofirza Novi Yanti Nursyafni, Nursyafni Nursyaputri, Wan Mery Okti, Okti Wardani Pratiwi, Lini Purba, Cenora Evelynza Putri, Rahma Lia Rahmi Dewi Rakhmawati Farma Satrio, Tedy Suherman Suraya Lubis, Fitriani Surayya Lubis , Fitriani Surayya Lubis, Fitriani Wetya Fatma Kumala Sari