Zulkifly Abbas | UPM - Universiti Putra Malaysia (original) (raw)
Papers by Zulkifly Abbas
Advances in Materials Science and Engineering
In industrial equipment and home appliance applications, the electromagnetic compatibility compli... more In industrial equipment and home appliance applications, the electromagnetic compatibility compliance directive (ECCD) demands that electromagnetic interference side effects be eliminated or marginally minimized. The equipment must not disturb radio and telecommunication as well as other appliances. Additionally the ECCD also governs the immunity of such equipment to interference and seeks to ensure that this equipment is not disturbed by radio emissions when used as intended. Many types of absorbing materials are commercially available. However, many are expensive and not environmentally friendly. It is in the light of the above that we studied the electromagnetic absorption properties of ZnO-PCL nanocomposites prepared from cheap and abundant resources which are environmentally friendly (zinc and polycaprolactone). The test was carried out using a microstrip, open ended coaxial probe, and vector network analyzer. Amongst other findings, result showed that the ZnO-PCL nanocomposite has the capability of attenuating microwave frequency up to −18.2 dB due to their very high specific surface areas attributed to the nanofillers at 12 GHz.
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ABSTRACT This paper focuses on the determination of the degree of the emulsion for the water-in-p... more ABSTRACT This paper focuses on the determination of the degree of the emulsion for the water-in-palm oil mixture. The degree of emulsion of the mixture is dependent on the properties of dielectric constant. The dielectric properties of the mixtures were measured using Agilent dielectric probe with frequencies ranging from 1 GHz to 18 GHz. Two types of mixture rules were discussed and respectively used in the modeling of the dielectric properties of both crude palm oil and crude kernel palm oil. The macroscopic analysis on the mechanisms occurs in both water-palm oil mixtures were carried out and discussed in detail.
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Physics Letters A, 2008
This article looks at the mass transfer of the steady two-dimensional magnetohydrodynamic (MHD) b... more This article looks at the mass transfer of the steady two-dimensional magnetohydrodynamic (MHD) boundary layer flow of an upper-convected Maxwell (UCM) fluid past a porous shrinking sheet in the presence of chemical reaction. The resulting nonlinear partial ...
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Lecture Notes in Computer Science, 2007
Finite Difference Time-Domain (FDTD) is one of the most widely used numerical method for solving ... more Finite Difference Time-Domain (FDTD) is one of the most widely used numerical method for solving electromagnetic problems. Solutions for these problems are computationally expensive in terms of processing time. Recently, we develop a method, High Speed Low ...
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Measurement Science Review, 2010
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2005 1st International Conference on Computers, Communications, & Signal Processing with Special Track on Biomedical Engineering, 2005
Abstract-In this paper, a numerical simulation by a new high speed low order FDTD (HSLO-FDTD) met... more Abstract-In this paper, a numerical simulation by a new high speed low order FDTD (HSLO-FDTD) method will be conducted to simulate one dimensional free space wave propagation of 2.4 GHz Gaussian pulse. The efficiency of the new schemes are analyze and ...
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Theoretical and Computational Fluid Dynamics, 2006
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Sensors, 2013
A moisture detection of single rice grains using a slim and small open-ended coaxial probe is pre... more A moisture detection of single rice grains using a slim and small open-ended coaxial probe is presented. The coaxial probe is suitable for the nondestructive measurement of moisture values in the rice grains ranging from from 9.5% to 26%. Empirical polynomial models are developed to predict the gravimetric moisture content of rice based on measured reflection coefficients using a vector network analyzer. The relationship between the reflection coefficient and relative permittivity were also created using a regression method and expressed in a polynomial model, whose model coefficients were obtained by fitting the data from Finite Element-based simulation. Besides, the designed single rice grain sample holder and experimental set-up were shown. The measurement of single rice grains in this study is more precise compared to the measurement in conventional bulk rice grains, as the random air gap present in the bulk rice grains is excluded.
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Physics Letters A, 2008
The laminar flow problem of convective heat transfer for a second grade fluid over a semi-infinit... more The laminar flow problem of convective heat transfer for a second grade fluid over a semi-infinite plate in the presence of species concentration and chemical reaction is investigated. The governing equations are transformed into a dimensionless system of three non-linear coupled partial differential equations. These equations have been solved analytically subject to the relevant boundary conditions by employing a homotopy
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Physics Letters A, 2006
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Journal of Magnetism and Magnetic Materials, 2010
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Journal of Composite Materials, 2012
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Journal of Colloid and Interface Science, 2009
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The Journal of Chemical Physics, 2007
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Advances in Materials Science and Engineering
In industrial equipment and home appliance applications, the electromagnetic compatibility compli... more In industrial equipment and home appliance applications, the electromagnetic compatibility compliance directive (ECCD) demands that electromagnetic interference side effects be eliminated or marginally minimized. The equipment must not disturb radio and telecommunication as well as other appliances. Additionally the ECCD also governs the immunity of such equipment to interference and seeks to ensure that this equipment is not disturbed by radio emissions when used as intended. Many types of absorbing materials are commercially available. However, many are expensive and not environmentally friendly. It is in the light of the above that we studied the electromagnetic absorption properties of ZnO-PCL nanocomposites prepared from cheap and abundant resources which are environmentally friendly (zinc and polycaprolactone). The test was carried out using a microstrip, open ended coaxial probe, and vector network analyzer. Amongst other findings, result showed that the ZnO-PCL nanocomposite has the capability of attenuating microwave frequency up to −18.2 dB due to their very high specific surface areas attributed to the nanofillers at 12 GHz.
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
ABSTRACT This paper focuses on the determination of the degree of the emulsion for the water-in-p... more ABSTRACT This paper focuses on the determination of the degree of the emulsion for the water-in-palm oil mixture. The degree of emulsion of the mixture is dependent on the properties of dielectric constant. The dielectric properties of the mixtures were measured using Agilent dielectric probe with frequencies ranging from 1 GHz to 18 GHz. Two types of mixture rules were discussed and respectively used in the modeling of the dielectric properties of both crude palm oil and crude kernel palm oil. The macroscopic analysis on the mechanisms occurs in both water-palm oil mixtures were carried out and discussed in detail.
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Physics Letters A, 2008
This article looks at the mass transfer of the steady two-dimensional magnetohydrodynamic (MHD) b... more This article looks at the mass transfer of the steady two-dimensional magnetohydrodynamic (MHD) boundary layer flow of an upper-convected Maxwell (UCM) fluid past a porous shrinking sheet in the presence of chemical reaction. The resulting nonlinear partial ...
Bookmarks Related papers MentionsView impact
Lecture Notes in Computer Science, 2007
Finite Difference Time-Domain (FDTD) is one of the most widely used numerical method for solving ... more Finite Difference Time-Domain (FDTD) is one of the most widely used numerical method for solving electromagnetic problems. Solutions for these problems are computationally expensive in terms of processing time. Recently, we develop a method, High Speed Low ...
Bookmarks Related papers MentionsView impact
Measurement Science Review, 2010
Bookmarks Related papers MentionsView impact
2005 1st International Conference on Computers, Communications, & Signal Processing with Special Track on Biomedical Engineering, 2005
Abstract-In this paper, a numerical simulation by a new high speed low order FDTD (HSLO-FDTD) met... more Abstract-In this paper, a numerical simulation by a new high speed low order FDTD (HSLO-FDTD) method will be conducted to simulate one dimensional free space wave propagation of 2.4 GHz Gaussian pulse. The efficiency of the new schemes are analyze and ...
Bookmarks Related papers MentionsView impact
Theoretical and Computational Fluid Dynamics, 2006
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Sensors, 2013
A moisture detection of single rice grains using a slim and small open-ended coaxial probe is pre... more A moisture detection of single rice grains using a slim and small open-ended coaxial probe is presented. The coaxial probe is suitable for the nondestructive measurement of moisture values in the rice grains ranging from from 9.5% to 26%. Empirical polynomial models are developed to predict the gravimetric moisture content of rice based on measured reflection coefficients using a vector network analyzer. The relationship between the reflection coefficient and relative permittivity were also created using a regression method and expressed in a polynomial model, whose model coefficients were obtained by fitting the data from Finite Element-based simulation. Besides, the designed single rice grain sample holder and experimental set-up were shown. The measurement of single rice grains in this study is more precise compared to the measurement in conventional bulk rice grains, as the random air gap present in the bulk rice grains is excluded.
Bookmarks Related papers MentionsView impact
Physics Letters A, 2008
The laminar flow problem of convective heat transfer for a second grade fluid over a semi-infinit... more The laminar flow problem of convective heat transfer for a second grade fluid over a semi-infinite plate in the presence of species concentration and chemical reaction is investigated. The governing equations are transformed into a dimensionless system of three non-linear coupled partial differential equations. These equations have been solved analytically subject to the relevant boundary conditions by employing a homotopy
Bookmarks Related papers MentionsView impact
Physics Letters A, 2006
Bookmarks Related papers MentionsView impact
Journal of Magnetism and Magnetic Materials, 2010
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Journal of Composite Materials, 2012
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Bookmarks Related papers MentionsView impact
Journal of Colloid and Interface Science, 2009
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The Journal of Chemical Physics, 2007
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