Djoko Setyo Widodo

Piezoelectric energy harvesters (PEHs) are gaining attention for their ability to generate electrical energy from environmental vibrations, with applications in various industries. This study focuses on optimizing the performance of a PEH using a cantilever system driven by wind energy through the impact of windmill blades. The objective is to evaluate how the number of windmill blades affects the PEH's voltage output and vibration stability. Experiments were conducted in a wind tunnel with a 250 mm × 250 mm cross-section equipped with a 12-inch blower to generate airflow. Three windmill configurations—3 blades, 4 blades, and 5 blades—were analyzed for output voltage and deflection of two PVDF-based PEHs placed at a 30° angle. Results indicate that the 3-blade configuration produced the highest voltage (1.79V), 4% and 43% higher than the 4-blade (1.71V) and 5-blade (1.01V) configurations, respectively. This configuration also exhibited maximum deflection and lower frequency vibrations. Increasing blade count led to higher frequency vibrations but reduced deflection and voltage output. The study highlights that fewer blades result in greater deflection and better energy harvesting performance. These findings contribute to ongoing research in PEH systems, offering insights into optimizing energy harvesting from fluctuating wind conditions by balancing deflection amplitude and vibration frequency.

Purpose: The purpose of this study is to analyze the nexus of entrepreneurial orientation and knowledge management on the Business performance of SMEs mediated by competitive advantage. Theoretical framework: The conceptual model for this study was developed based on previous research and resource-based theory as grand theory. The conceptual model has three factors that affect the Business performance of SMEs in West Java, Indonesia. Design/methodology/approach: This study used verification methods with a number of samples of 200 respondents by using random sampling. The Structural Equation Models (SEM) analyzed the data using Lisrel. Findings: The results show that entrepreneurial orientation and Knowledge Management have a significant effect on the competitive advantage and Business performance of SMEs and competitive advantage can be mediated by the nexus of Knowledge Management and entrepreneurial orientation on Business performance of SMEs in West Java. Research, Practical & Social implications: The implications drawn from this research help owners or managers of human resources in existing SMEs to focus their performance by considering entrepreneurial orientation, Knowledge Management, and competitive advantage. Originality/value: This study is important for owners of SMEs and the government because it confirms business owners' need to increase entrepreneurial orientation and Knowledge Management in order to boost a competitive advantage and business performance of SMEs in the marketplace.