Researcher:
Nasyori, Achmad

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Master Student

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Achmad

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Nasyori

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Nasyori, Achmad

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2021 - 20222

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    Determination of Islamic Month Start by Moonsighting Australia (Case Study: 1 Dzulhijah 1441)
    (University of Management and Technology, 2022) Fatmawati, Fatmawati; Akmal, Andi Muhammad; Akhyar, Andi Muh.; Azwar, Azwar; Nasyori, Achmad; Master Student; Graduate School of Sciences and Engineering; N/A
    The determination of the Islamic calendar is paramount in Islam because it strongly relates to worship, like Ramadan fasting, eid-al-fitr, and zakat fitr. Many studies have examined young moon visibility criteria in many Muslim countries, such as Indonesia, Saudi Arabia, Thailand, and Singapore. However, no study on the initiation of the Islamic month has been conducted in Australia, a Muslim-minority country with middle-eastern immigrants seeking jobs. One of Australia's most trusted organizations to announce the start of Hijri month is Moonsighting Australia. Therefore, this study aimed to analyze the determination of the Islamic calendar by Moonsighting Australia organization based on factors such as method, matla, rukyat time, hilāl visibility, and resistors (1 Dzulhijjah 1441 H). A descriptive study with a qualitative approach used literature reviews, content analysis, and case studies. Primary data were taken from a decision letter from Moonsighting Australia about the start of Dzulhijjah 1441 H, interviews with the coordinator, and relevant references. The findings showed that Moonsighting Australia applies a rukyat method by the naked eye-without any optical aids and hilāl visibility criteria consideration-every 29th of Hijri month. Also, it tunes the concept of matla wilayat al hukmi, where the sighting process and result are implemented throughout Australia’s territory.
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    PublicationOpen Access
    Effect of natural dye extracting solvents on the performance of dye-sensitised solar cells
    (Institute of Physics (IOP) Publishing, 2021) Noor F.A.; Department of Physics; Nasyori, Achmad; Department of Physics; Graduate School of Sciences and Engineering
    Dye-sensitised solar cells (DSSCs) have attracted immense attention in photovoltaics research and development due to the low cost of fabrication, sustainability and use of abundant natural resources. Natural dyes were adapted to DSSCs as a sensitiser but unfortunately proved to have poor efficiency. Herein, we manufactured two organic dyes from yellow and red gambier fruits and treated both dyes with methanol and isopropyl alcohol. The photoanode and photocathode were prepared from TiO2, sensitiser and indium thin dioxide (ITO); and carbon and indium thin dioxide, respectively. An electrolyte was made by mixing potassium iodide and iodine. The doctor blade method was used to add the semiconductor to the surface of the conducting ITO. UV-Vis and FTIR spectroscopic measurements have been performed to determine the absorbance and functional groups in the gambier extracts. From the analysis of UV-Vis and FTIR spectra, and photovoltaic measurements made under solar irradiation, we found that the gambier extracts are dominated by tannin and flavonoids and that dyes using isopropyl alcohol as the solvent have higher efficiency than using methanol, respectively. This indicates that the gambier extracts and solvents might influence the performance of DSSCs.