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All Journal TELKOMNIKA (Telecommunication Computing Electronics and Control) Journal of Global Economic Research
Djoko Setyo Widodo
Jakarta Global University
Computer Science & IT Economics, Econometrics & Finance

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Performance of piezoelectric energy harvesters at various angles Adhes Gamayel; Mohamad Zaenudin; Djoko Setyo Widodo
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 23, No 6: December 2025
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v23i6.26860

Abstract

Piezoelectric materials are capable of generating electricity in response to mechanical strain, making them suitable for energy harvesting applications. Piezoelectric energy harvesters (PEHs) are promising alternatives for renewable energy generation, particularly because mechanical strain can be induced in various ways, including utilizing wind flows. This study investigates the performance of a PEH integrated with a laboratory-scale wind-driven micro-windmill. The experiment is carried out by rotating blades of the windmill intermittently; thus, it contacts the PEH, inducing oscillatory motion and generating strain, which finally produces electricity. The configuration angle is varied with 30°, 45°, and 60° to produce variation of power output analyzed in this study. The results demonstrate that a lower configuration angle, specifically 30°, produces the highest voltage near 1.4 V. This is due to the alignment of the applied force with the natural bending direction of the cantilever, resulting in greater induced strain and increased voltage output. Conversely, increasing the configuration angle reduces the effectiveness of force induced to PEH, diminishing strain induction and electrical generation, which only about 1.2 V. The finding of this study can potentially contribute to advance the design and optimization of PEHs for renewable energy applications, particularly in powering microelectronic devices.
The Role of Leadership Style and Information Technology on Employee Performance Mediated by Job Satisfaction in Cargo Companies in DKI Jakarta Djoko Setyo Widodo
Journal of Global Economic Research Vol. 2 No. 2 (2025)
Publisher : Akademi Akuntansi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62194/81zdah43

Abstract

The purpose of this study is to determine the effect of leadership style and information technology on employee performance mediated by job satisfaction in cargo companies in DKI Jakarta. The method used is descriptive quantitative. The analysis tool used is SEM SmartPLS 4.1.0.0. The data used is primary data. The population in this study is unknown. The sampling technique used is Simple Random Sampling using Hair's formula. The research was conducted at a cargo company in Jakarta. The tests conducted were Validity Test, Reliability Test, Inner Model, Outer Model, and Hypothesis Test. The results of this study are as follows: 1) Leadership style has a positive and significant effect on employee satisfaction at a cargo company in Jakarta; 2) Information technology has a positive and significant effect on employee satisfaction at a cargo company in Jakarta; 3) Leadership Style does not have a positive and significant effect on Employee Performance in Cargo Companies in Jakarta; 4) Information Technology has a positive and significant effect on Employee Performance in Cargo Companies in Jakarta; and 5) Employee Satisfaction has a positive and significant effect on Employee Performance in Cargo Companies in Jakarta; 6) Leadership style has a positive and significant effect on employee performance through employee satisfaction in cargo companies in Jakarta; and 7) Information technology has a positive and significant effect on employee performance through employee satisfaction in cargo companies in Jakarta.
Co-Authors Adhes Gamayel Mohamad Zaenudin