Article Per Year (5 Year)
p-Index From 2019 - 2024
0.61
P-Index
This Author published in this journals
All Journal Metalurgi Jurnal INFOTEL
Iwan Setiawan
National Research and Innovation Agency
Computer Science & IT Electrical & Electronics Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
A Preliminary Study of Cobalt Solvent Extraction from Nickel Sulphate Solution Using Organic Extractant-PC-88A Rudi Subagja; Arief Dwi Rohman; Anistasia Milandia; Soesaptri Oediyani; Iwan Setiawan
Metalurgi Vol 38, No 1 (2023): Metalurgi Vol. 38 No. 1 2023
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (625.14 KB) | DOI: 10.55981/metalurgi.2023.684

Abstract

In present study, a solvent extraction experiment has been done to separate cobalt from the nickel sulfate solution by using 2-ethythexyl phosponic acid mono-2-ethylhexyl ester (PC-88A) as extractant. The experiment was carried out on a laboratory scale by using a separating funnel to extract cobalt from the nickel sulfate solution with PC88A. The mixed solution was shake in separating funnel for a specified period of time, and after the solvent extraction experiment was finished the organic phase PC88 was separated from the nickel sulfate solution by decantation. The nickel and cobalt content in the aqueous nickel sulfate solution were then analyzed using Atomic absorption spectrophotometry (AAS). In this experiment, the variable for  experiments were covering  solution pH from 2 to 6, shaking time from 30 minutes to 120 minutes, shaking speed  from 20 revolutions per minute (rpm) to 80 rpm, and the volumeratio  of aqueous to organic phase  (A:O ratio) was from 1:1  to 1:4. The effects that experimental variables to the cobalt extraction were observed in this experiment. The result of experiment at room temperature, solution pH 5, shaking speed  60 rpm,  shaking time  90 minutes,  A:O ratio  1:4 and  concentration of PC- 88A  40% show  97.21% of cobalt can be extracted by PC-88A from nickel sulfate solution, thererfore it was  necessary to conduct two stage extraction process  to extract 100% of the cobalt from the nickel sulfate solution. 
Secure protection for covid-19 infographic using blockchain and discrete cosine transform-singular value decomposition (DCT-SVD) watermarking Muhammad Fajar Sidiq; Akbari Indra Basuki; Didi Rosiyadi; Iwan Setiawan; Yusnan Hasani Siregar; Sriyadi Sriyadi
JURNAL INFOTEL Vol 14 No 2 (2022): May 2022
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20895/infotel.v14i2.749

Abstract

Covid-19 infographics have a crucial role in mitigating the covid-19 pandemic by conveying the complex Covid19 information in a form of a simple yet understandable image. However, keenly to contribute to mitigating Covid-19, numerous parties and agencies had released Covid-19 infographics that might contain incorrect or inaccurate information. To prevent such recurrent, this paper proposed an authentication system by using a blockchain-based authorization service that lets the authority guarantee the correctness and validity of the infographics in a transparent manner. We proposed smart contract-based watermarking requests and approval management that let anyone track the watermarking process. To prevent unauthorized infographic fabrications, we use the DCT-SVD method considering its robustness against various attacks. We deployed and evaluated the smart contract on Ethereum test networks (Ropsten, Rinkeby, Goerli, and Kovan) to compare the efficiency and the ease of use. The result showed that the test networks have similar efficiency while the Ropsten and Goerli have better ease of use. The watermark validation service is accessible via a web-based interface for anyone to check the validity of the infographic’s watermark.
Co-Authors Akbari Indra Basuki Anistasia Milandia Arief Dwi Rohman Didi Rosiyadi Muhammad Fajar Sidiq Rudi Subagja Soesaptri Oediyani Sriyadi Sriyadi Yusnan Hasani Siregar