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6 results on '"Sayed Nordin, Sayed Kushairi"'

1. Stress intensity factors for Thermoelectric Bonded Materials weakened by an inclined crack

Author

Mohd Nordin, Muhammad Haziq Iqmal, Hamzah, Khairum, Nik Long, Nik Mohd Asri, Khashi’ie, Najiyah Safwa, Waini, Iskandar, Zainal, Nurul Amira, Sayed Nordin, Sayed Kushairi, Mohd Nordin, Muhammad Haziq Iqmal, Hamzah, Khairum, Nik Long, Nik Mohd Asri, Khashi’ie, Najiyah Safwa, Waini, Iskandar, Zainal, Nurul Amira, and Sayed Nordin, Sayed Kushairi

Abstract

Thermoelectric Bonded Materials (TEBM) weakened by an Inclined Crack Problems (ICP) subjected to remote stress was presented in this study. The problems are addressed by employing the Modified Complex Variable Function (MCVF) method, which incorporates the Continuity Conditions (CC) for the Resultant Electric Force (REF) and Displacement Electric Function (DEF) to formulate the Hypersingular Integral Equations (HSIEs) associated with these problems. By applying the curved length coordinate method, the unknown functions of Crack Opening Displacement (COD), Electric Current Density (ECD), and Energy Flux Load (EFL) are mapped onto the square root singularity function. The resulting equations are then numerically solved using appropriate quadrature formulas, with the traction along the crack utilized as the right-hand term. The obtained COD, ECD and EFL functions is then used to compute the dimensionless Stress Intensity Factors (SIFs) in order to determine the stability behavior of TEBM weakened by an ICP. The numerical results provided demonstrate the dimensionless SIFs at the crack tips. These results exhibit excellent agreement with previous studies conducted on the subject. Additionally, it is observed that the dimensionless SIFs at the crack tips are influenced by factors such as the ratio of Elastic Constants (ECR), the geometry of the cracks, and the coefficients associated with the Electric Current Density (ECD).

Published
2024

2. Numerical solution for a curvilinear crack phenomenon in thermoelectric bonded materials subjected to mechanical loadings

Author

Mohd Nordin, Muhammad Haziq Iqmal, Hamzah, Khairum, Nik Long, Nik Mohd Asri, Khashi’ie, Najiyah Safwa, Waini, Iskandar, Zainal, Nurul Amira, Sayed Nordin, Sayed Kushairi, Mohd Nordin, Muhammad Haziq Iqmal, Hamzah, Khairum, Nik Long, Nik Mohd Asri, Khashi’ie, Najiyah Safwa, Waini, Iskandar, Zainal, Nurul Amira, and Sayed Nordin, Sayed Kushairi

Abstract

In this study, a curvilinear crack phenomenon laying in the upper part of thermoelectric bonded materials subject to mechanical loadings is considered. A curvilinear crack problem in thermoelectric bonded materials subjected to shear stress is formulated. The modified complex potential (MCP) function method is used to formulate this crack phenomenon into the hypersingular integral equations (HSIEs) with the help of the continuity conditions of the resultant electric force and displacement electric function. The normal and tangential traction along the crack segment serves as the right-hand side of the integral equation. The HSIEs are solved numerically for the unknown crack opening displacement (COD) function, electric current density, and energy flux load using the appropriate quadrature formulas. The numerical solution presented the behavior of the dimensionless stress intensity factors (SIFs) at the crack tips which depend on the elastic constant’s ratio, the position of the crack, the electric conductivity, and the thermal expansion coefficients.

Published
2024

4. Modeling the Spatial Spillover Effects of Energy Consumption, Environmental Degradation and Economic Growth in High and Middle-Income Countries.

Author

Sayed Nordin, Sayed Kushairi and Sek, Siok Kun

Subjects
*ENVIRONMENTAL degradation, *MIDDLE-income countries, *ENERGY consumption, *ECONOMIC development, *HIGH-income countries, *VECTOR error-correction models
Abstract

This study investigates the relationship between energy consumption, environmental degradation and economic growth for high and middle-income countries using spatial panel and non-spatial panel regression based on yearly data from 2002-2013 (N=14, T=12). The empirical results suggest that spatial panel models are more appropriate than the non-spatial panel model for high-income countries data. Energy consumption provides a significant impact on economic growth and environmental degradation in middle-income countries. The results are consistent with most of the previous studies and reveal useful information about the spatial effect in the estimated models. This provides a better understanding of the inter-relationship among the variables in different groups of countries to attain sustainable development. [ABSTRACT FROM AUTHOR]

Published
2019
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5. Comparing the Relationship among CO2 Emissions, Energy Consumption and Economic Growth in High and Low Income Countries: Panel Granger Causality and Cointegration Testing.

Author

Bin Sayed Nordin, Sayed Kushairi and Siok Kun Sek

Subjects
*EMISSIONS (Air pollution), *ENERGY consumption, *LOW-income countries, *GROSS national product, *GRANGER causality test, *COINTEGRATION
Abstract

Energy is an important element used in the production industry, and it is crucial for the development of a country. However, higher consumption of energy could lead to higher carbon dioxide emissions. Previous studies had shown that these variables are highly correlated. However, results may vary across economies. In this study, we seek to study the relationships between these three variables by comparing countries in different groups, i.e. highincome countries versus low-income countries. The study's main objectives include (1) to examine the short-run relationship (one-way or two-way) on pairs of variables using panel Granger causality test; (2) to reveal the long-run cointegration relationship based on three different models using panel unit root and cointegration tests. These tests are based on statistical hypotheses testing. Our panel data consists of 30 countries throughout the time period of 1971-2013. The result of the panel unit root tests show that each variable is integrated of order one, I(1) for both groups of countries, while the Granger causality test reveals some evidence on the short-run relationships between the variables in both groups of countries. Moreover, the panel cointegration tests detect a long-run relationship, which is stronger in low-income countries. This study provides a deeper understanding of the interactions of these three variables and suggest the implementation of appropriate actions and policy to achieve a balance between environmental quality and growth in the sustainable development of a country. [ABSTRACT FROM AUTHOR]

Published
2018
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