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All Journal JURNAL ILMIAH MATEMATIKA DAN TERAPAN Pillar of Physics: Jurnal Berkala Ilmiah Fisika Prosiding Seminar Nasional Hasil Penelitian Sains, Teknik dan Aplikasi Industri Fakultas Teknik Universitas Lampung
Maharani, M
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Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics

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Optimalisasi Biaya Dan Waktu Pada Usaha Kerajinan Kayu Hitam Di Sumber Urip Ebony Dengan Menggunakan Metode Hungarian Maharani, M; Jaya, A I; Sahari, A
JURNAL ILMIAH MATEMATIKA DAN TERAPAN Vol. 16 No. 2 (2019)
Publisher : Program Studi Matematika, Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (594.984 KB) | DOI: 10.22487/2540766X.2019.v16.i2.14987

Abstract

ABSTRACTPalu as the Capital of Central Sulawesi province is known as one of the crafts made from ebony. Ebony woodcraft industry in Palu begin to increase with the establishment of several business ebony, one of them is Sumber Urip Ebony Store that not only as a shop to sell the crafts, but at the same time as a place to produce the ebony wood crafts . This store have 9 workers and already have an adequate means of production. This study aimed is to propose the hungarian method to solve multi-objective assignment by optimizing the cost and time of production. From the results of the study is obtained that the total cost of producing all kinds of crafts is Rp. 8,080,000, - with a total of 87 days. This indicates more efficient results when compared with the cost of Rp. 12.6 50.000, - with a total of 115 days at Sumber Urip Ebony Store.Keywords : Assignments of Workers, Hungarian Method, Multi-objective Assignment, Optimize.
The Effect of Go Composition Variation on The Optical Properties of ZnO/GO Thin Films as a Candidate Material for Solar Cells Maharani, M; Jonuarti, Riri; Ratnawulan, R; Hidayat, Rahmat
PILLAR OF PHYSICS Vol 18, No 1 (2025)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/16848171074

Abstract

This study aims to investigate the effect of Graphene Oxide (GO) composition variation on the optical and electronic properties of ZnO/GO thin films, which have potential as candidate materials for solar cells. The synthesis method employed is sol-gel, followed by the spin coating technique to produce thin films on glass substrates. Characterization was carried out using X-Ray Diffraction (XRD) to determine the crystalline structure, Scanning Electron Microscopy (SEM) for morphological analysis, and UV-Vis spectroscopy to measure optical properties, including light absorption and band gap.  The results indicate that a 3% GO composition significantly affects the optical and electronic properties of ZnO/GO. The addition of GO enhances light absorption in both the UV and visible ranges and reduces the band gap, contributing to improved energy conversion efficiency. Furthermore, SEM characterization shows a better particle distribution at 3% GO compared to other compositions, enhancing the interaction between ZnO and GO. Based on these findings, it can be concluded that a ZnO/GO combination with 3% GO has good potential as a material for solar cell applications. This research is expected to contribute to the development of more efficient and environmentally friendly renewable energy materials
Studi Awal Rancang Bangun Geophone Menggunakan Koil Magnetik Sebagai Massa Inersia dan Pegas Tipe Static Balancing Stiffness Darmawan, IGB; Mahli, RAK; Matondang, PH; Maharani, M; Mahmudah, S; Dani, I; Zaenudin, A; Karyanto
Prosiding Seminar Nasional Ilmu Teknik Dan Aplikasi Industri Fakultas Teknik Universitas Lampung Vol. 7 (2024): Prosiding Seminar Nasional Ilmu Teknik dan Aplikasi Industi (SINTA) 2024
Publisher : Fakultas Teknik Universitas Lampung

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Abstract

Geophone merupakan sensor utama yang digunakan untuk merekam gelombang seismik bumi yang banyak digunakan di Indonesia khususnya dalam sistem peringatan dini gempa bumi dan tsunami. Kondisi ini menunjukkan bahwa kebutuhan sensor geophone di Indonesia sangat tinggi dan penting, namun hingga saat ini, belum ada produsen geophone di Indonesia. Penelitian ini merupakan studi awal untuk membuat rancang bangun sensor geophone dengan prinsip koil magnetik dengan massa inersia bergerak menggunakan pegas yang menerapkan static balancing stiffness. Metode perancangan dilakukan menggunakan pemodelan dan pencetakan 3D sedangkan pengujian dilakukan dengan geophone pembanding tipe GD45 dengan frekuensi 4,5 Hz. Enam dari sepuluh rancang bangun koil geophone berhasil mendekati nilai induktansi geophone pembanding sebesar ±23 mH, dengan diameter 10 – 15 mm, jumlah lilitan 640 – 750 kali dan massa 8 – 9 gram. Hasil pengujian menunjukkan bahwa koil tanpa pegas memiliki noise lebih tinggi dibandingkan geophone pembanding, yang berdampak pada rasio signal to noise (S/N) yang lebih rendah. Namun, koil dengan pegas dan diameter lebih besar (15 mm) menunjukkan rasio noise yang lebih rendah dan mendekati geophone pembanding. Sensitivitas koil terhadap getaran meningkat seiring dengan bertambahnya diameter koil, terutama pada diameter 15 mm. Selain itu, efek dumping dari pegas pada semua koil lebih tinggi dibandingkan geophone pembanding, menunjukkan kemampuan peredaman yang lebih baik pada desain pegas static balancing stiffness.
Co-Authors A Zaenudin, A Dani, I Darmawan, IGB Jaya, A I Karyanto Mahli, RAK Mahmudah, S Matondang, PH Rahmat Hidayat Ratnawulan . Riri Jonuarti Sahari, A