Archives

  • January-June 2022
    Vol. 1 No. 1 (2022)

    Journal of Engineering and Science Vol. 1 No. 1 (Jan–Jun 2022) presents five foundational studies covering micro‑scale photovoltaic system design (methodical sizing and performance estimation for a 50 Wp solar installation), evaluation of waste coconut shell as an alternative solid biofuel (emphasizing its energy characteristics and combustion viability), comparative routes for converting plastic waste into liquid fuels (highlighting thermochemical methods and their relative yields and product quality), failure analysis of the wheel–rail contact surfaces in an overhead travelling crane (identifying wear and probable contributing operational or material factors), and structural calculation and design of a Type II civil engineering laboratory building at UMSU Medan (addressing load analysis and code‑compliant member sizing for safety and serviceability).

  • July-December 2022
    Vol. 1 No. 2 (2022)

    Journal of Engineering and Science Vol. 1 No. 2 (July–December 2022) gathers five studies linking rooftop solar performance analysis with fatigue life prediction of automotive suspension components. The first article (Comparison of Rooftop Solar Panel Output Power Based on the Apparent Motion of the Sun: Banda Aceh Case Study) examines how the Sun’s seasonal/diurnal apparent path influences optimal panel orientation and resultant energy yield in a tropical setting. The second (Analyzing the Tensile Strength of AISI 1045 Coil Springs in Avanza 2020 Cars: A Comparative Study of Experimental Results using Simulation Technology) validates material and structural behavior by comparing laboratory tensile (and likely derived stress–strain) data with simulation (e.g., finite element) outputs to refine modeling accuracy. The remaining three form a methodological sequence employing a strain‑life (ε–N) approach to fatigue: predicting service life of a minibus front coil spring over flat, ascending, and descending road profiles; jointly estimating fatigue of the coil spring and lower suspension arm under varying road surface geometries that generate different strain spectra; and isolating fatigue life of the lower suspension arm under straight‑line versus cornering conditions where combined vertical and lateral loads alter damage accumulation. Collectively, the issue emphasizes integrating empirical–computational correlation and spectrum‑based strain analysis to enhance durability forecasting while also addressing localized solar resource optimization.

  • January-June 2023
    Vol. 2 No. 1 (2023)

    Issue Journal of Engineering and Science Vol. 2 No. 1 (Jan–Jun 2023) contains five articles focused on electric power quality, renewable/hybrid energy efficiency, power factor improvement in large installations, and environmentally friendly material and process innovations. The first article discusses improving the voltage profile at the Banda Aceh Substation through the installation of a 25 MVAR capacitor bank—likely evaluating increases in bus voltage levels, power factor improvement, reduction of network losses, and voltage profile stability during peak load. The second article assesses the influence of adding/configuring a porous plate on panels made from cat tail (Typha latifolia) plant fibers on the sound absorption coefficient, pointing toward low‑cost acoustic applications and green materials. The third article offers an innovation in coil heater technology for the brick firing process with the aim of reducing emissions (e.g., fossil fuel consumption, particulate smoke) and improving temperature uniformity so that brick quality becomes more consistent. The fourth article again addresses optimization of voltage system performance—this time at the Nagan Raya steam power plant—through the design/control of a capacitor bank to improve power factor, keep voltage within standard limits, and potentially reduce reactive power penalty costs. The fifth article investigates the effects of using a grid‑tie inverter in a hybrid solar panel–diesel system, including grid synchronization, load management, reduction of generator operating hours, conversion efficiency, and potential reductions in fuel consumption and emissions. Overall, this issue highlights integrated technical approaches for: (1) enhancing the quality and efficiency of power systems, (2) substituting and optimizing renewable energy in hybrid configurations, and (3) utilizing natural materials and more sustainable process technologies.

  • July-December 2023
    Vol. 2 No. 2 (2023)

    Issue Description (Vol. 2 No. 2, July–December 2023 – Journal of Engineering and Science), This mid-2023 issue showcases cross-disciplinary diversity unified by integrative themes: the digitalization of monitoring and control, enhancement of energy system reliability and efficiency, optimization of manufacturing process parameters, strengthening the performance of natural fiber–based materials, and the harnessing of artificial intelligence to accelerate design innovation. The first article presents the development of an automated system that simultaneously monitors and controls temperature and pH in snakehead fish aquaculture, reflecting the application of real-time sensing and closed-loop actuation to improve aquatic organism health, stabilize water quality, and potentially reduce mortality and feed costs. The second article examines neutral current instability and power losses in the PAS 21 feeder distribution transformer, highlighting power quality issues arising from load imbalance and their implications for efficiency, overheating, and equipment lifespan—providing a basis for phase balancing or load reallocation strategies. The third article evaluates the effect of cutting speed when using a 2.5 mm diameter nozzle in laser cutting, supplying empirical insight into the relationships among traverse speed, edge (kerf) quality, heat-affected zone characteristics, and productivity to support optimal parameter selection. The fourth article investigates the role of maleic anhydride polypropylene (MAPP) as a coupling agent on the flexural properties of hybrid kenaf–sugar palm fiber reinforced polypropylene composites, underscoring the importance of enhancing interfacial adhesion to maximize the synergy of natural fiber hybridization and expand lightweight structural applications based on renewable resources. The fifth article delivers a comprehensive comparative analysis of artificial intelligence software platforms for interior design, evaluating generative capability, interoperability, learning curve, and their potential to enhance creative concept exploration and iteration efficiency. Collectively, the issue portrays a research landscape progressing toward engineering systems that are smarter, more adaptive, sustainable, and collaborative: from precision aquaculture and distribution energy reliability, through refinement of manufacturing processes and improved bio-composite material performance, to the orchestration of AI as a creative partner in design.

  • June
    Vol. 4 No. 1 (2025)

    This issue Vol. 4 No. 1, June 2025 – Journal of Engineering and Science presents a spectrum of engineering research unified by threads of sustainability, multi-criteria performance optimization, design innovation for resource-constrained contexts, and the enhancement of access to engineering education. The first article addresses an urban environmental issue by examining the influence of moisture variation on NH₃ and H₂S emissions during municipal solid waste drying, offering potential insights for odor mitigation and improved occupational safety at processing facilities. The second article advances material evaluation methodology through the application of Grey Relational Analysis to integrate diverse quality parameters of composite particleboard into a unified performance index, accelerating the determination of optimal process combinations. The third article focuses on small-scale renewable energy generation in low wind speed regions by comparing the performance of taper and inverse taper turbine blades, emphasizing geometric adaptation to improve start-up torque and energy capture efficiency. The fourth article explores the fatigue resistance of thermoplastic polyurethane composites reinforced with sugar palm fiber, highlighting the potential of locally sourced bio-based materials for light to semi-flexible cyclic applications. The fifth article presents strategies for enhancing the performance of low-cost DC motors for educational purposes, balancing electromechanical efficiency, operational stability, and affordability. Collectively, the issue illustrates a research direction that combines environmentally friendly technologies, natural resource-based materials engineering, measured optimization, and the democratization of engineering learning tools—reflecting a commitment to innovation that is both practically relevant and responsive to contemporary sustainability challenges. (Note: This description is based on available table of contents information.)

  • Cover JES Volume 4 Nomor 2 December 2025

    December
    Vol. 4 No. 2 (2025)

    This issue Vol. 4 No. 2, December 2025 – Journal of Engineering and Science presents a collection of applied engineering research centered on structural construction practices, predictive maintenance methodologies, specialized tool development, and vehicle component durability analysis. The first article documents the practical implementation of column formwork systems for high-rise construction, specifically examining work procedures and challenges encountered during the 10th floor construction phase of the Sky House Alam Sutera Phase 3 project, contributing valuable field insights for vertical building execution. The second article advances electrical asset management through the integration of Dissolved Gas Analysis (DGA) testing with breakdown voltage measurements and fuzzy logic methods to diagnose transformer oil degradation, enabling more accurate failure prediction and preventive maintenance scheduling in power distribution systems. The third article addresses a specific industrial need through the design and fabrication of a hydraulic transmission jack tailored for heavy-duty truck maintenance operations, demonstrating practical engineering solutions for specialized service equipment. The fourth and fifth articles both focus on fatigue life prediction of automotive suspension components using strain-life approaches, examining coil springs and lower suspension arms in different vehicle categories—heavy-duty trucks and minibuses—thereby contributing to enhanced vehicle safety, maintenance planning, and component design optimization. Collectively, this issue reflects a pragmatic research orientation that bridges construction site realities, condition-based maintenance technologies, custom tooling innovation, and data-driven durability assessment—underscoring the journal's commitment to engineering research that directly supports industrial practice, infrastructure reliability, and operational safety. (Note: This description is based on available table of contents information.)

  • June
    Vol. 5 No. 1 (2026)