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All Journal Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Nusantara Science and Technology Proceedings
Pujiastuti , Caecilia
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Economics, Econometrics & Finance Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology

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Optimization of Annual and Five Years Tax Payment Services for Motorized Vehicles in Samsat "X" Ngatilah , Yustina; Siati; Pujiastuti , Caecilia
Nusantara Science and Technology Proceedings 1st International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2020.0529

Abstract

The Samsat "X" office is a joint service office between the police, the regional income office, and the Jasa Raharja. The services provided are annual and five years of tax payments for motorized vehicles. The current service process is having an uncertain or probabilistic service time and long waiting time, resulting in long queues. This long queue condition causes taxpayer dissatisfaction. One of the methods to solve this problem is the Monte Carlo simulation. Monte Carlo simulation is a simulation method for solving problems with a set of sampling techniques from a probabilistic process. The objective of this research is to determine the optimum number of service personnel by using the Monte Carlo simulation method. The results of this simulation are the optimum conditions (best) for the tax payment services problem at the Samsat "X" office. The result shows that the optimum conditions are obtained with an average waiting time = 22.5479 minutes, an average of service utility level = 81.23%, queue length = 3 persons, and the number of service personnel = 3 persons for annual tax payment services, while for five years tax payment services, the optimum condition for average waiting time = 42.85336 minutes, an average of service utility level = 91.38%, queue length = 5 persons, and the number of service personnel 2 persons.
Perbandingan Microwave Steam Distillation dan Microwave Steam Diffusion pada Ekstraksi Citronella Oil: The Comparison between Microwave Steam Distillation and Microwave Steam Diffusion in Extraction of Citronella Oil Putra , Sandy Buana; Zamzami, Muhammad Rifqy; Pujiastuti , Caecilia; Erliyanti, Nove Kartika; Panjaitan, Renova
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 8 No. 1 (2024)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rbaet.2024.008.01.05

Abstract

Pengambilan minyak atsiri serai wangi dapat dilakukan dengan berbagai jenis metode ekstraksi. Metode ekstraksi yang digunakan dapat mempengaruhi kuantitas produk minyak atsiri yang didapatkan. Metode ekstraksi nonkonvensional memberikan efisiensi dan efektivitas yang baik. Salah satu metode ekstraksi nonkonvensional adalah Microwave Assisted Extraction (MAE). Metode MAE memiliki banyak pengembangan seperti Microwave Steam Distillation (MSD) dan Microwave Steam Diffusion (MSDf). Pada penelitian ini, metode MSD dan MSDf dikaji dengan membandingkan hasil ekstraksi minyak serai wangi yang diperoleh dengan metode MSD dan MSDf yang menerapkan teknik ekstraksi Chouhan. Hasil penelitian menunjukkan bahwa yield minyak serai wangi yang diekstrak dengan metode MSD lebih tinggi dibandingkan yield hasil ekstraksi dengan metode MSDf baik itu pada metode dengan atau tanpa penerapan teknik ekstraksi Chouhan, dimana yield tertinggi diperoleh pada metode MSD kombinasi penggunaan teknik Chouhan dengan nilai sebesar 3,2% (b/b). Analisis indeks bias dan warna produk minyak serai wangi yang diperoleh pada metode MSD dan MSDf dengan atau tanpa penerapan teknik Chouhan secara garis besar telah memenuhi SNI. Adapun hasil pengujian Gas Chromatography Mass Spectrometry (GCMS) menunjukkan bahwa komponen utama dalam minyak serai wangi hasil ekstraksi dengan metode MSD dan MSDf adalah sama yaitu geraniol dengan persentase pada masing-masing metode secara berurutan adalah 48,52% dan 46,82%.
Co-Authors Erliyanti, Nove Kartika Panjaitan, Renova Putra , Sandy Buana Siati Yustina Ngatilah Zamzami, Muhammad Rifqy