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All Journal International Journal of Economic Research and Financial Accounting Sainteknol : Jurnal Sains dan Teknologi
Nurul Khusna
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Economics, Econometrics & Finance Other

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The Effect of Providing Incentives on Employee Performance at the Makassar City Regional Drinking Water Company (PDAM) Nurul Khusna; Andi Jam’an; Irwan Abdullah
International Journal of Economic Research and Financial Accounting Vol 2 No 3 (2024): IJERFA APRIL 2024
Publisher : CV. AFDIFAL MAJU BERKAH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55227/ijerfa.v2i3.126

Abstract

This research aims to determine the effect of providing incentives on employee performance at the Makassar City Regional Drinking Water Company (PDAM). The type of data used in this research is quantitative data obtained from distributed questionnaires and is related to the problem being studied. Data collection techniques were carried out using questionnaires, observation and documentation. In this research, the data sources used in data collection include primary data and secondary data. The population in this study were 77 employees of the Regional Drinking Water Company of Makassar City. The sample used in this research was 77 respondents. The research instrument used in this research used the Likert scale (method). Based on the results of data research using statistical calculations through the Statistical for the Social Science (SPSS) version 26 application regarding the Effect of Providing Incentives on Employee Performance at the Makassar City Regional Drinking Water Company (PDAM) which was discussed previously, the author draws an important conclusion, (namely) that Incentives have an effect positive and significant on Employee Performance at the Regional Drinking Water Company (PDAM) of Makassar City as evidenced by the Incentive regression coefficient (X) value of 0.460 and the t count value of 8.759 > t table 1.665 with a significant value of 0.000 < 0.05.
Synergistic Enhancement of Lignocellulosic Biomass Saccharification via Ultrasound-Assisted Pretreatment with Magnetic Fe₃O₄ Hanif Ardhiansyah; Astrilia Damayanti; Bahlawan, Zuhriyan Ash Shiddieqy; Serlia Fitri Sadan; Nurul Khusna; Karenina Hakim
Sainteknol : Jurnal Sains dan Teknologi Vol. 23 No. 2 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v23i2.41061

Abstract

The recalcitrant structure of lignocellulosic biomass necessitates efficient pretreatment strategies to enhance enzymatic saccharification for biofuel production. This study investigates a synergistic approach combining ultrasound irradiation with magnetic Fe₃O₄ for pretreating rice straw. A 2² factorial experimental design was employed to systematically evaluate the individual and combined effects of ultrasound (300 W, 30 min) and Fe₃O₄ addition (1.5 wt%). The combined treatment exhibited a pronounced synergistic effect, achieving 68.3% delignification and reducing the crystallinity index from 52.4% to 31.2%. These structural modifications resulted in a saccharification yield of 72.5%, which was significantly higher than the theoretical additive yield of 48.7% (raw: 18.5%, Fe₃O₄-only: 26.0%, ultrasound-only: 41.2%). SEM observations revealed extensive surface erosion, pore formation, and microfibril exposure after the combined pretreatment, while FTIR analysis confirmed substantial lignin removal. Furthermore, magnetic Fe₃O₄ demonstrated excellent magnetic separability, with a recovery efficiency higher than 95%, and maintained pretreatment performance over five reuse cycles with < 8% reduction in efficacy. Overall, this work presents a green, efficient, and economically promising pretreatment strategy based on synergistic ultrasound–magnetic Fe₃O₄ interactions, offering an effective pathway for enhancing lignocellulosic biomass saccharification and supporting the development of sustainable biorefinery processes.
Co-Authors Andi Jam’an Astrilia Damayanti Bahlawan, Zuhriyan Ash Shiddieqy Fatma Laili Khoirun Nida Hanif Ardhiansyah Irwan Abdullah Karenina Hakim Serlia Fitri Sadan