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All Journal Teknika JTERA (Jurnal Teknologi Rekayasa) Chemistry Indonesian Journal of Chemical Research Indonesian Journal of Chemical Analysis (IJCA) Serambi Engineering
Dampang, Sarah
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Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering

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PENENTUAN HARGA BAHAN BAKAR GAS KENDARAAN MENGGUNAKAN SIMULASI MONTE CARLO Picunang, Badaruddin Andi; Dampang, Sarah; Efelina, Vita; Nugraha, Billy
JTERA (Jurnal Teknologi Rekayasa) Vol 5, No 1: June 2020
Publisher : Politeknik Sukabumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1426.861 KB) | DOI: 10.31544/jtera.v5.i1.2019.135-150

Abstract

Moda transportasi baik kendaraan pribadi, angkutan umum, maupun angkutan barang yang merupakan potensi market yang strategis bagi industri energi. Hal ini khususnya dalam upaya melakukan konversi pemakaian Bahan Bakar Minyak (BBM) ke Bahan Bakar Gas (BBG). Dengan demikian, optimasi penentuan harga BBG dibanding dengan harga BBM perlu dilakukan untuk memperoleh harga ideal, sehingga dapat memberikan kontribusi bagi para pelaku usaha baik dari sisi efiesiensi, safety maupun keuntungan ekonomi jangka panjang. Penelitian ini bertujuan untuk melakukan optimasi penentuan harga BBG menggunakan simulasi Monte Carlo. Dalam penelitian ini, dipilih suatu uji sampling dengan tingkat akurasi yang baik untuk memprediksi variabel-variabel acak dan dalam jumlah iterasi data yang banyak. Simulasi Monte Carlo dilakukan dengan perangkat Crystal Ball yang merupakan metode statistik yang sudah umum digunakan dalam uji sampling suatu variabel untuk memprediksi segala kemungkinan yang terjadi terhadap berbagai pilihan alternatif. Hasil penelitian menunjukkan wilayah Jakarta memiliki harga gas paling rendah menggunakan metode agregasi yaitu sekitar Rp. 2.900, sedangkan paling tinggi menggunakan metode real yaitu sekitar Rp. 3.300. Wilayah Jawa Barat memiliki harga gas paling rendah menggunakan metode real yaitu sekitar Rp. 3.000, sedangkan paling tinggi menggunakan metode agregasi dan floating USD yaitu sekitar Rp. 3.100. Untuk wilayah Banten harga gas paling rendah menggunakan metode agregasi yaitu sekitar Rp. 2.900, sedangkan paling tinggi menggunakan metode floating USD yaitu sekitar Rp. 3.400.
Pengaruh Perbedaan Kondisi Hidrolisis Terhadap Hasil Isolasi Nanokristalin Selulosa Dari Bonggol Jagung Purwanti, Endah; Dampang, Sarah
Indonesian Journal of Chemical Research Vol 5 No 1 (2017): Edisi Bulan Juli (Edition For July)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2017.5-end

Abstract

Cellulose is one of the largest components in corncobs. Cellulose was obtained from corncob in this research that has a yield of 19.6% of 20 grams of corncob powder. The isolated cellulose was characterized by using FTIR and SEM. Cellulose has crystalline chain and insoluble in water or organic solvents. The molecular chain of cellulose is linear and has intra- and inter-molecular hydrogen bonds. One way for cellulose to be easy in the treatment of applications, is to convert microcrystalline cellulose into nanocrystalline cellulose. Nanocrystalline cellulose can be obtained by several methods, one of them by acid hydrolysis. Hydrolysis of cellulose by using sulfuric acid produces nanocrystalline cellulose. Nanocrystalline cellulose can be characterized by using TEM and PSA analysis. CNC 60 has a particle size distribution with a diameter range of 14.3 nm - 45.0 nm and an average diameter of 17.4 nm. Whereas cellulose with CNC 90 has a smaller particle size distribution with a diameter range of 10.0 nm - 17.1 nm and an average diameter of 11.9 nm.
Sintesis dan Karakterisasi Membran Ultrafiltrasi Termodifikasi Kitosan-Silika Alfiludin, Kamila; Dampang, Sarah; Yuliasari, Fitri; Hakim, Muhammad Fahmi
TEKNIKA Vol. 19 No. 3 (2025): Teknika September 2025
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.15687792

Abstract

Limbah indutsri yang mengandung ion logam berat dapat mencemari lingkungan dan berdampak pada kesehatan. Dalam mengatasi hal tersebut diperlukan solusi alternatif yaitu dengan penggunaan teknologi filtrasi. Pengembangan membran ultrafiltrasi berbahan dasar kitosan dan silika, yang dimodifikasi dengan Polivinil Alkohol (PVA) dan Polietilen Glikol (PEG), bertujuan untuk mengurangi kandungan logam berat dalam limbah industri. Formulasi membran dikembangkan melalui metode trial and error, kemudian dikarakterisasi menggunakan Fourier Transform Infrared (FTIR) untuk identifikasi gugus fungsional, Brunauer-Emmett-Teller (BET) untuk analisis luas permukaan dan pori membran, serta uji swelling untuk mengukur kapasitas penyerapan air. Hasil uji FTIR menunjukkan keberadaan gugus silanol (Si-OH) pada rentang 3268-3290 cm⁻¹, yang berperan dalam interaksi dengan ion logam. Analisis BET mengonfirmasi bahwa membran yang dikembangkan memenuhi karakteristik ultrafiltrasi. Selain itu, membran dengan komposisi kitosan 3 gram dan silika 3 ml menunjukkan performa optimal serta kapasitas swelling yang tinggi, sehingga meningkatkan efektivitas proses filtrasi. Dengan daya tahan dan stabilitas yang baik, membran ini berpotensi untuk diaplikasikan dalam pengolahan limbah industri guna mengurangi kandungan logam berat secara efektif.
Synthesis of Acrylonitrile Butadiene Styrene Membrane with Sulfonated Reduced Graphene Oxide and Cerium Filler Siswantito, Firgi; Dampang, Sarah; Perdani, Meka Saima; Hakim, Muhammad Fahmi; Iskandar, Riska Listiarini
Indonesian Journal of Chemical Analysis (IJCA) Vol. 8 No. 2 (2025): Indonesian Journal of Chemical Analysis
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijca.vol8.iss2.art1

Abstract

The study investigates the use of acrylonitrile butadiene styrene (ABS) polymer modified by sulfonated reduced graphene oxide (s-rGO) and cerium (Ce) as an alternative membrane to Nafion for Direct Methanol Fuel Cell (DMFC) applications. Pure ABS membranes and ABS membranes with s-rGO/Ce fillers were synthesized and characterized, with sulfonation at 60 °C using filler concentrations of 1%, 3%, and 5% v/v. The addition of fillers aimed to enhance ion exchange capacity (IEC), water absorption, and reduce methanol permeability. The membrane with 5% filler content showed optimal performance, with an IEC of 0.35 meq/g, a swelling degree of 1.5%, and controlled methanol permeability of 1.2670 × 10⁻⁷ cm²/s. FTIR analysis confirmed the presence of sulfonate groups (S=O) at 1054 cm⁻¹, indicating successful sulfonation. SEM analysis revealed that the filler was well-dispersed and formed more defined pores without compromising the structural integrity of the ABS matrix. This study demonstrates the potential of s-rGO/Ce-modified ABS membranes as a viable alternative to Nafion membranes in DMFC applications.
Pengaruh Variasi Komposisi dan Tekanan Alat Press Mini Produk Terhadap Mechanical Properties Produk Papan Silikat Skala Mini (Studi Kasus di PT XYZ) Bayhaqi Ilham, Aldiana; Dampang, Sarah
Jurnal Serambi Engineering Vol. 10 No. 4 (2025): Oktober 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Silicate board is one of the products produced at PT XYZ. This material is resistant to water and fire, making it very useful in building construction. In addition, silicate board can be used as an alternative to bricks or gypsum because it is easier to apply. The manufacture of silicate board requires the right combination of compositions to suit industrial needs. This study aims to analyze the effect of variations in composition and pressure in the process of making small-scale silicate boards (mini products). Mini products are made in several samples with different combinations of composition and pressure. In the study, cement compositions were used with percentages of 30%, 32%, and 34% at each pressure. Meanwhile, the pressure applied was 60 bar and 70 bar for each composition. The analysis parameters include the Modulus of Rupture (MOR), Moisture content, Water absorption, and density values ​​in each sample. The results of the study showed fluctuations in these values ​​based on variations in composition and pressure. However, there was one sample that consistently had the highest value in various aspects. This finding indicates that the combination of composition and pressure must be adjusted properly to produce silicate boards with optimal quality.
Co-Authors Alfiludin, Kamila Bayhaqi Ilham, Aldiana Efelina, Vita Hakim, Muhammad Fahmi Iskandar, Riska Listiarini Nugraha, Billy Perdani, Meka Saima Picunang, Badaruddin Andi Siswantito, Firgi Solly Aryza YULIASARI, FITRI