cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
M. Irwan Hadi
Contact Email
m.h4di@ymail.com
Phone
-
Journal Mail Official
ajstea@yasin-alsys.org
Editorial Address
Jalan Lingkok Pandan No 208 Kwang Datuk, Desa Selebung Ketangga, Kec. Keruak, kab. Lombok Timur, Prov. Nusa Tenggara Barat, Indonesia
Location
Kab. lombok timur,
Nusa tenggara barat
INDONESIA
Asian Journal of Science, Technology, Engineering, and Art
Published by Lembaga Yasin Alsys
ISSN : 30255287     EISSN : 30254507     DOI : https://doi.org/10.58578/AJSTEA
Core Subject : Science, Art, Social, Engineering,
Arts Computer Science & IT Engineering Social Sciences
Asian Journal of Science, Technology, Engineering, and Art [3025-5287 (Print) and 3025-4507 (Online)] is a double-blind peer-reviewed, and open-access journal to disseminating all information contributing to the understanding and development of Science, Technology, Engineering, and Art. Its scope is international in that it welcomes articles from academics, researchers, graduate students, and policymakers. The articles published may take the form of original research, theoretical analyses, and critical reviews. AJSTEA publishes 6 editions a year in February, April, June, August, October and December. This journal has been indexed by Harvard University, Boston University, Dimensions, Scilit, Crossref, Web of Science Garuda, Google Scholar, and Base. AJSTEA Journal has authors from 5 countries (Indonesia, Nigeria, Pakistan, Nepal, and India).
Arjuna Subject : Umum - Umum
Articles 231 Documents
 14   15   16   17   18 
Industrial Clusters and Nearshoring in Mexico: A Strategic Framework for Economic Repositioning Hernández, Armando Pacheco; Bonilla-Landaverry, Gesly Anibal
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 3 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i3.5628

Abstract

The objective of this work is to make known the importance of clusters through nearshoring. In Mexico, it is part of several trade agreements, such as the T-MEC (Treaty between Mexico, the United States, and Canada), which facilitates international trade and provides tariff advantages. This may attract companies looking to benefit from these agreements. Mexico has a qualified and competitive workforce in terms of costs. Education and technical training are constantly growing, providing companies with trained human talent. Nearshoring can boost the creation and expansion of industrial clusters in different regions of Mexico. Clusters are geographic concentrations of companies and organizations related to the same sector. These clusters foster innovation and collaboration, increasing synergies and operational efficiency. Mexico has a diversified economy with key sectors such as manufacturing, automotive, technology, and aerospace. Nearshoring can encourage the growth of clusters in these sectors, promoting innovation and technological development. Mexico has shown economic stability and has policies to support industrial and technological development. The government has implemented programs to encourage foreign investment and infrastructure development, which can be attractive to companies seeking to establish themselves in the country. Establishing new businesses and expanding existing ones can create jobs and stimulate local economic growth. Clusters encourage collaboration and the exchange of ideas, which can lead to technological advances and greater competitiveness. Regional Development: The creation of clusters can help develop less urbanized regions, better distributing economic opportunities throughout the country.
A Statistical Study of Convicted and Awaiting Trial Individuals in Nigeria (2025) Ayenigba, Alfred Ayo; Ajao, Olutunde Michael; Augustine, Chinenmerem Darlington
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 3 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i3.5629

Abstract

This study examines gender disparities, conviction patterns, and judicial inefficiencies in Nigeria’s correctional system using 2025 data from the Nigerian Correctional Service (NCoS), encompassing 81,200 inmates. Employing a Chi-square Goodness-of-Fit Test, the analysis revealed a stark gender imbalance, with males constituting 97% of inmates versus 50.1% in the general population (χ² = 72,950, p < 0.001), reflecting systemic biases in policing and prosecution. A Chi-square Test of Independence demonstrated a significant association between gender and conviction status (χ² = 62.4, p < 0.001), with 33.7% of males convicted compared to 23.3% of females, while 76.7% of females languished in pre-trial detention. A One-Sample Proportion Test further showed Nigeria’s conviction rate (33%) to be significantly lower than the historical benchmark of 35% (z = -12.5, p < 0.001), highlighting judicial delays and inefficiencies. These findings underscore systemic failures in Nigeria’s criminal justice system, including over-policing of men, prolonged pre-trial detention of women, and chronic case backlogs. The study concludes with urgent recommendations for gender-sensitive reforms, digitized court processes, and alternative sentencing to align practices with human rights standards and reduce overcrowding.
Buffalo as a Vision of the Future: Sustainable Agribusiness for Latin American Food Security Hernandez, Armando Pacheco; Bonilla-Landaverry, Gesly Anibal
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 3 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i3.5632

Abstract

Bufalos production emerges as a strategic alternative within sustainable agribusiness, especially in tropical regions of Latin America, where environmental conditions favor their development. Unlike conventional livestock species, buffalo have greater productive and economic performance under dual purpose systems, which makes them a viable option for small and medium -sized rural producers. This study aims to analyze the technical and financial feasibility of incorporating buffalo in extensive grazing systems, highlighting its efficiency to transform high availability forages into tropics into quality meat and milk. This modality allows to operate with low production costs, generating stable income and reducing common risks in the livestock sector. In addition, the approach is aligned with the principles of sustainability, by promoting the rational use of natural resources and strengthening regional food security. The results suggest that the incorporation of buffalo into production systems not only improves the well -being of producers, but also promotes more resilient agricultural models, profitable and committed to the social and ecological environment. In this way, it is consolidated as a strategic option for rural economic development, contributing to the strengthening of agribusiness oriented to food production in Latin America.
Comparison of Ethanol Production from three Different Tuber Plants (Manihot esculenta, Ipomoea batata and Dioscorea Spp) Zakari, Muhammad Saminu; Wazimtu, Rebecca Paul; Emmanuel, Sarki Salvation
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 3 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i3.5643

Abstract

In recent years, the annual energy consumption from petroleum sources has increased many folds resulting not only in continuous depletion of limited fossil fuel stocks but also a cause of concern for the safer, better and greener environment. Further, the high prices of fossil fuel have led to an energy crisis in both developing and developed countries that are oil dependent. Following these challenges, there is need to find alternative sources of producing energy. This study aimed at comparison of ethanol production from three different tuber plants (Manihot Esculenta, Ipomoea Batata and Dioscorea SPP). The cassava, sweet potato and yam peels were collected from the market premises of Jalingo Local Government Area, Taraba State. The collected samples were taken to a convenient place where they were sorted. The peels of cassava, sweet potato and yam were separately sorted to have mainly the peels for drying. The drying was carried out in open air which lasted for a week. The well dried samples were then milled using a hammer mill, Mortar and pestle which reduced the cassava, sweet potato and yam peels to very small particle sizes and weighed. To 10 g of the powdered wort, distilled water was added, mashed and filtered. Yeast and malt were added to the filtered wort and allowed to stand for three (3) days for fermentation. After fermentation, the fermented wort was distilled to collect a colourless liquid as the distillate. This distillate was neutral to litmus test, soluble in water and indicated the presence of alcohol by Ester, Sodium Metal, Iodoform and Lucas Tests. The result compared from 3 samples showed that cassava peels produced the highest ethanol concentration (6.25) followed by yam peels (6.13) while the minimum ethanol yield was obtained from sweet potato peels (5.01) at temperature 78.40C and PH 7.2 after 72 hours of fermentation. This work has shown that cassava, sweet potato and yam peels which are considered a non-valuable waste are suitable raw materials and could be efficiently utilized for the production of ethanol.
Design and Optimization of 30/40MVA, 132/33kV Power Transformer Using Responses Surface Methodology Sani, Sabo M.; Bakare, G. A.; Mahmood, A.; Sabo, A.
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 3 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i3.5691

Abstract

Transformer is the main apparatus of the power system for both transmission and distribution of electrical energy. It is the important component of electrical engineering because of its high efficiency and helps in step up and step down the voltage, impedance matching and circuit isolation. Team of designers, engineers and building owners struggled for high performance in order to maximize the transformer efficiencies and minimized losses, weight, volume and costs. Design and selection of material to construct a transformer core is a significant process. When designing transformers, especially power transformers, incorrect sizing of active components such as core geometry, low voltage winding and high voltage winding dimensions and tank dimensions can cause additional losses in the transformer. Determining these parameters at the design stage using optimization techniques has a very significant impact on the efficiency and cost effectiveness of the transformer. The purpose of this work is to design and optimized a practical 30/40MVA, 132/33kV, three phase power transformer using Octave and Responses Surface Methodology (RSM). From the work, it was concluded that the optimization of power transformer gives more accurate results as compared to the assume values. The percentage variations of core loss and copper loss in the optimized power transformer with respect to classical value were 4.35% and 13.48%, while that of efficiency was 0.14%.The percentage variations of reactance as well as the core area with classical values were 29.22% and 14.73%. Thus, for the accurate analysis of the result, it is important to optimize the power transformer.
Hybrid PID-LQR Controller for Dynamic Response and Stability Enhancement of Synchronous Generator’s AVR System Eze, Paulinus C.; Nwadike, Stanley U.; Oyiogu, Dennis C.; Iroegbu, Mercy Chinenye
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 3 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i3.5693

Abstract

The delay in the transition from transient to steady-state conditions in exciter field dynamics is identified as a key factor contributing to inefficiencies in maintaining a stable terminal output voltage in synchronous generators. This delay often results in significant overshoot in the generator’s output voltage, negatively affecting the performance of connected loads such as electric motors. This study aims to develop and evaluate a control strategy based on Proportional-Integral-Derivative and Linear Quadratic Regulator (PID-LQR) models to mitigate this issue. A hybrid control system was designed to enhance voltage stability within the Automatic Voltage Regulator (AVR) of an exciter-based synchronous generator. Using MATLAB simulations, the proposed PID+I-LQR controller demonstrated a reduction in system overshoot from 60.9547% to 1.1524%, representing a 98.1% improvement in voltage stability. Comparative analysis with other control models confirmed the superior performance of the PID-LQR-based controllers in achieving smooth voltage response and convergence to a stable terminal voltage, with the exception of LQI and PID+PD-LQR controllers. The findings underscore the effectiveness of PID-LQR controllers in improving dynamic response and voltage regulation in synchronous generator systems.
Modelling and Analysis of a Power Transformer Using Finite Element Analysis Muhammad, Sabo Sani; Abdulrazak, Sabo; Bakare, G. A.; Abdulhafiz, Sabo; Nazif, D. M.
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 3 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i3.5703

Abstract

This study presents an enhanced Finite Element Method (FEM) model for comprehensive analysis of power transformers, addressing electromagnetic, thermal, and electrostatic performance aspects with improved accuracy and efficiency. Conventional analytical approaches to evaluating transformer characteristics—such as core losses, copper losses, magnetic flux distribution, and thermal behavior—are often labor-intensive and susceptible to inaccuracies. To overcome these limitations, a double discretization FEM (DD-FEM) framework was developed using ANSYS Maxwell and ANSYS Mechanical software to simulate a 30 MVA, 132/33 kV three-phase power transformer. The electromagnetic simulation yielded core and copper losses of 19.62 kW and 97.03 kW, respectively, with DD-FEM reducing absolute errors by 1.38% and 1.48% compared to standard FEM methods. Thermal modeling under normal loading conditions indicated a peak winding temperature of 94.2°C, rising to 112.9°C during overloading (33 MVA), thus justifying the need for forced cooling systems. Electrostatic analysis confirmed that electric field stresses between windings remained within safe operational limits (10.48 kV/mm²), though a localized insulation weakness was identified between the low-voltage winding and the core (3.74 kV/mm²). Across all evaluated parameters, the DD-FEM model showed superior alignment with benchmark analytical results, reducing relative errors in core loss estimation by up to 12.2%. These results affirm the efficacy of the enhanced FEM approach in optimizing transformer design, enhancing operational reliability, and reducing engineering uncertainty, particularly under varying load and fault scenarios. The study demonstrates the critical role of advanced numerical tools in modern transformer engineering and high-fidelity system simulation.
Performance and Economic Evaluation of Power Transformer Muhammad, Sabo Sani; Abdulrazak, Sabo; Haruna, Y. S.; Abdulhafiz, Sabo; Nazif, D. M.
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 3 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i3.5704

Abstract

This study presents a comprehensive performance and economic evaluation of a three-phase 132/33 kV delta/star power transformer using an enhanced Finite Element Method (FEM) integrated with ANSYS Maxwell software. The transformer model, developed based on operational data from the Gudum substation in Bauchi, Nigeria, was designed to assess electromagnetic and thermal characteristics under no-load, full-load, and short-circuit conditions. The FEM simulation incorporated detailed geometric configuration, material properties (M125-027S laminated steel core and copper windings), optimized meshing, and coupling with external electrical circuits. Key performance indicators—including magnetic flux density, core and copper losses, voltage and current outputs, and efficiency—were evaluated under varying load scenarios. The model exhibited peak efficiency of 80.84% at 97.10% loading, and simulated load currents demonstrated loss reductions between 8.46% and 11.05% relative to empirical measurements, validating the model’s reliability. Furthermore, a life cycle cost (LCC) analysis was conducted using present-value cash flow techniques over a projected 22-year operational period. The total LCC was estimated at ₦2,777,811,381, with no-load and load losses accounting for ₦534.2 million and ₦1.88 billion, respectively. These findings underscore the substantial economic implications of design and material decisions in transformer manufacturing and operation. The study emphasizes the value of advanced FEM-based tools in optimizing transformer performance and cost-efficiency, offering strategic guidance for procurement, maintenance planning, and long-term infrastructure investment in power systems.
A Simplified Hybrid Analytical Method for Solving Integer and Fractional-Order Differential Equations without Adomian Polynomials or Lagrange Multipliers O., Okai J.; M., Cornelius; I., Abdulmalik; A., Jeremiah; M., Nasir U.; U., Hafsat Y.; O., Abichele
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 3 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i3.5719

Abstract

In this study, we propose a novel hybrid analytical technique that combines the Adomian Decomposition Method (ADM) with the Variational Iteration Method (VIM) to solve a class of linear and nonlinear first-order initial value problems (IVPs), including those of fractional order. The principal aim of this approach is to overcome the computational challenges typically encountered in each individual method—namely, the complexity of generating Adomian polynomials in ADM and the requirement for Lagrange multipliers in VIM. By synthesizing the strengths of both methods, the hybrid scheme constructs analytical series solutions without necessitating linearization, Adomian polynomials, or the explicit formulation of Lagrange multipliers. This significantly streamlines the solution process while preserving accuracy and generality. The validity and computational efficiency of the proposed method are substantiated through a series of illustrative examples, encompassing both integer-order and fractional differential equations. The results demonstrate that the hybrid approach not only simplifies implementation but also yields precise and rapidly converging solutions, making it a robust alternative for tackling a broad spectrum of initial value problems in mathematical modeling and applied sciences.
Golden Ratio and Fibonacci Quadratic Equation in Business and Finance Kumar, Nand Kishor; Shah, Raj Kumar; Sahani, Suresh Kumar
Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 3 (2025): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v3i3.5726

Abstract

The Golden Ratio and Fibonacci quadratic equation provide powerful insights into financial decision-making. From stock market analysis to business growth strategies, these mathematical principles offer practical applications in the financial world. By leveraging it, finance and investors can enhance their forecasting, optimize risk assessment, and improve financial outcomes. The existence of this Fibonacci sequence is not coincidental since it has been properly developed and maintained. There are more possibilities to study the mathematical properties of the Fibonacci numbers in the contemporary mathematics curriculum. Research into Fibonacci numbers facilitates the investigation of the existence of the Fibonacci sequence in God's beautiful essence. In short, God's dominance over humans is illustrated by the Fibonacci numbers and sequence.

Page 16 of 24 | Total Record : 231

 14   15   16   17   18 

Filter by Year

2023 2026


Reset
Filter By Issues
All Issue Vol 4 No 1 (2026): Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 6 (2025): Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 5 (2025): Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 4 (2025): Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 3 (2025): Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 2 (2025): Asian Journal of Science, Technology, Engineering, and Art Vol 3 No 1 (2025): Asian Journal of Science, Technology, Engineering, and Art Vol 2 No 6 (2024): Asian Journal of Science, Technology, Engineering, and Art Vol 2 No 5 (2024): Asian Journal of Science, Technology, Engineering, and Art Vol 2 No 4 (2024): Asian Journal of Science, Technology, Engineering, and Art Vol 2 No 3 (2024): Asian Journal of Science, Technology, Engineering, and Art Vol 2 No 2 (2024): Asian Journal of Science, Technology, Engineering, and Art Vol 2 No 1 (2024): Asian Journal of Science, Technology, Engineering, and Art Vol 1 No 2 (2023): Asian Journal of Science, Technology, Engineering, and Art Vol 1 No 1 (2023): Asian Journal of Science, Technology, Engineering, and Art More Issue