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All Journal Journal of Science Innovare JURNAL REKAYASA KIMIA & LINGKUNGAN
Sugesti, Rahmawita
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Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Energy Engineering Medicine & Pharmacology

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Growth Of Mustard Greens (Brassica Rapa L.) Due To The Application Of Urea Fertilizer With Various Biuret Contents Sugesti, Rahmawita
Journal of Science Innovare Vol 6, No 2 (2023): Journal of Science Innovare, Volume 06 Number 02 2023
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/jsi.v4i1.4578

Abstract

This research was conducted in Cikampek, Karawang Regency. The purpose of this study was to study the effect of various doses of nitrogen fertilizer on the growth and yield of mustard greens. This study was arranged in a randomized block design consisting of 7 doses of urea, namely: control (without fertilizer); 50 kg/ha; 100 kg/ha; 150 kg/ha; 200 kg/ha; 250 kg/ha and 300 kg/ha, each treatment was repeated three times so that there were 21 experimental units. The results showed that the administration of urea fertilizer had a very significant effect on the growth and yield of mustard greens (plant height, number of leaves, fresh weight and dry weight of plants) and the best dose of urea fertilizer could be achieved at a dose of 200 kg/ha.
Quantitative Structure-Activity Relationship Study of Fatty Acid Derivatives as Lubricant Additive Sugesti, Rahmawita; Sutriah, Komar; Khotib, Mohammad
Jurnal Rekayasa Kimia & Lingkungan Vol 19, No 1 (2024): Jurnal Rekayasa Kimia & Lingkungan (June 2024 )
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v19i1.27374

Abstract

Fatty acid compounds and their derivatives have been known in tribology as a source of bio-lubricant raw materials. New compounds were developed computationally to sort out the physical properties of the desired lubricant additive before synthesis in the laboratory. In this study, the correlation between the chemical structure of fatty acid derivative compounds and their physical properties through the quantitative structure-activity relationship (QSAR) using the density functional theory (DFT) was determined. QSAR model resulted in two linear regression equations for the wear rate performance test at (1) the value of the weld load with 5%, 500N variation and (2) the value of the wear scar diameter 5%, 150N variation. Validation of the regression model was conducted using the leave-one-out (LOO) method. The new additive lubricants were designed using the obtained QSAR models of the wear rate performance test with the descriptor of total energy, dipole moment, and softness. Stearoyl diethanolamine compound was proposed as a lubricant additive with the best performance parameter of weld load and wear scar diameter at 298.03 kg and 0.29 mm respectively. The percentage performance of stearoyl diethanolamine for weld load and wear scar diameter was increased by 24.18% and 47.60%, respectively.
Co-Authors Komar Sutriah Mohammad Khotib