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All Journal JURNAL MANAJEMEN INDUSTRI DAN LOGISTIK Mekanika: Majalah Ilmiah Mekanika REACTOR : Journal of Research On Chemistry And Engineering
Ahmad Darmawi
Akademi Komunitas Industri Tekstil Dan Produk Tekstil (AK-Tekstil) Surakarta
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Decision Sciences, Operations Research & Management Energy Engineering Industrial & Manufacturing Engineering Transportation

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Pengaruh Variasi Prekursor Terhadap Morfologi dan Aktivitas Antibakteri Nanopartikel Tembaga Menggunakan Reduktor Ekstrak Daun Gambir Netri Elisma; Emriadi Emriadi; Ahmad Darmawi
REACTOR: Journal of Research on Chemistry and Engineering Vol 4, No 2 (2023): Published in December 2023
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v4i2.109

Abstract

Research on synthesis copper nanoparticles has been carried out by the bioreduction method with a green synthesis approach using extracts of gambir leaves (Uncaria gambir Roxb). Gambir leaf extract contains polyphenol compounds uses as a natural reducing agent to reduce copper cation from variations of prekursor (CuSO45.H2O, Cu(NO3)2.3H2O and CuCl2.2H2O). The formation of copper nanoparticles (CuNP) colloid is visually shown by color change from light brown to dark brown. Absorption peak in UV-Vis spectrophotometer analysis at 405 -427 nm which is a specific wavelength of copper nanoparticles base on phenomenon of Surface Plasmon Resonance (SPR). The X-Ray Diffraction (XRD) analysis showed formation of CuNP with a face centered cubic (fcc) crystal structure. The result of Transmission Electron Microscope show the synthesized CuNP was spherical with particle size diameter 15nm for CuSO4 prekursor, 25 nm for Cu(NO3) prekursor and  28 nm for CuCl2 prekursor. The size of nanoparticles influenced of type prekursor anions. The antibacterial activity of the synthesized nanoparticles was also tested using pathogenic bacteria Escherichia coli and Staphylococcus aureus. The results showed that copper nanoparticles were promising antibacterial agents. Antibacterial activity test on copper nanoparticles were found to have higher antibacterial activity against Gram positive bacteria S. aureus than Gram negatif E. coli.
Pengaruh Variabel Peningkatan Produktivitas , Penguasaan Teknologi Baru dan Pelatihan Terhadap Pengendalian Mutu Terpadu Karyawan Pada Industri Tekstil dan Garmen di Surakarta Ahmad Darmawi; Darsono Darsono
Jurnal Manajemen Industri dan Logistik Vol. 2 No. 1 (2018): page 03 - 103
Publisher : Politeknik APP Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30988/jmil.v2i1.21

Abstract

Integrated Quality Control requires the participation of all divisions within the company, such as marketing, design, manufacturing. Laboratory examination. As an integrated process that focuses on customers and beneficiaries, it simultaneously aims to protect and enhance the satisfaction of all stakeholders. Employee development does cost a lot, but it is a long-term investment for the company in personnel. Because skilled and skilled employees will be able to work more efficiently, effectively, wastage of raw materials, and less machine wear, better results will increase the company's competitiveness. The purpose of this research is (a) to know the level of Employee Productivity (TPK), (b) Employee Training (PK) and (c) Latest Technology Development (PTT) whether the positive effect on Integrated Employee Quality Control (PMTK). This research use Survey research method by using quantitative approach. The results obtained the employee Productivity Level positive effect on Integrated Quality Control Employees with 0,072 standardized coefficients. Employee Training has a positive effect on Integrated Employee Quality Control with a standardized coefficient of 0.164. Latest Technology Development positively influences to Integrated Quality Control Employee with a coefficient of standardized 0,114.
Integrating Agro-Waste Fiber into Sustainable Textile Innovation: Characterization of Mechanically Extracted Pineapple Leaf Fiber (PALF) for Circular Composite Applications Ahmad Darmawi; Sih Parmawati; Nurfadilah Ikhsani; Fahad Fahad
Mekanika: Majalah Ilmiah Mekanika Vol 25, No 1 (2026): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v25i1.107494

Abstract

This study explores the potential of pineapple leaf fiber (PALF) from the Queen variety as a sustainable reinforcement material for green composites and textiles, focusing on the effects of mechanical retting. The research addresses critical barriers to industrial adoption, such as fiber-quality variability and hydrophilicity, while highlighting an innovative waterless extraction method that reduces environmental impact compared with conventional processes. A quantitative experimental approach was employed to comprehensively characterize PALF, incorporating standardized tensile testing to measure mechanical properties and microscopic analyses with a Scanning Electron Microscope (SEM) to observe fiber morphology. Findings demonstrate that mechanical retting significantly improves PALF’s tensile strength (23.2 g/tex) and fineness (33.7 dtex). Microscopic analysis reveals a uniform, compact fiber structure that underpins the material's enhanced mechanical performance. PALF emerges as a viable, eco-friendly alternative to synthetic fibers. The waterless mechanical retting process is an effective method for producing high-quality reinforcement fibers, offering practical guidance for industries. This approach contributes significantly to agricultural waste reduction and advances circular economy principles in sustainable materials development.
Co-Authors Darsono Darsono Emriadi - Fahad Fahad Netri Elisma Nurfadilah Ikhsani Sih Parmawati