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All Journal JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY Management Dynamics: International Journal of Management and Digital Sciences
Rina Aprilia
Unknown Affiliation
Decision Sciences, Operations Research & Management Energy Industrial & Manufacturing Engineering Mechanical Engineering

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Characteristics of Ketapang Leaf Extract and PVA Nano Fibers Using the Electrospinning Method Sela, Melinia; Anida Chairatunnisa; Rina Aprilia; Rahmanita; Ida Sriyanti; Leni Marlina
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 8 No. 2 (2024): December 2024 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v8i2.10943

Abstract

The electrospinning method is a method of making nanofibers using the influence of an electric field to produce a jet of electrically charged polymer solution. In this experiment, polyvinyl alcohol (PVA) nanofibers and ketapang leaf extract with various viscosities were made using electrospinning equipment with a static collector. Scanning using an electron microscope (SEM) shows that the morphology of the nanofibers formed looks homogeneous, continuous, and without beads (beads free). The SEM results were analyzed using ImageJ software, which was then carried out using Origin software to determine the fiber diameter. Diameter size distribution with fiber diameter size distribution ranging from 2000 to 8000 nm.
The Effect of Leadership and Work Discipline on Employee Performance: Study at PT. Agro Afiat Nusantara Company in Barito Kuala Rina Aprilia; Rina Rina; Fanlia Adiprimadana Sanjaya
Management Dynamics: International Journal of Management and Digital Sciences Vol. 2 No. 3 (2025): International Journal of Management and Digital Sciences
Publisher : International Forum of Researchers and Lecturers

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70062/managementdynamics.v2i3.314

Abstract

This Study aims to examine the influence of leadership and work discipline on employee performance at PT. Agro Afiat Nusantara in Barito Kuala, a non-subsidized fertilizer distribution company operating in South Kalimantan. The research focuses on two main variables: leadership and work discipline, both of which are theoretically considered essential in improving employee performance. A quantitative approach was employed, with data collected through questionnaires distributed to all 30 employees using a saturated sampling method. The data were analyzed using multiple linear regression with the assistance of SPSS (Statistical Package for the Social Sciences) version 27. The analysis revealed that (1) leadership, when tested partially, does not have a significant effect on employee performance; (2) in contrast, work discipline has a positive and significant effect; and (3) simultaneously, both variables significantly contribute to enhancing performance. These findings highlight the crucial role of consistent and structured work discipline particularly in terms of punctuality, responsibility, and adherence to rules as a key factor in supporting employee performance. Practically, the study suggests a reassessment of the leadership style applied within the company and emphasizes the need to strengthen a culture of discipline as part of a sustainable human resource management strategy.
Co-Authors Anida Chairatunnisa Fanlia Adiprimadana Sanjaya Ida Sriyanti Leni Marlina Rahmanita Rina Rina Sela, Melinia