Zulkifly Abbas | UPM - Universiti Putra Malaysia (original) (raw)

Papers by Zulkifly Abbas

Research paper thumbnail of Reduction of Electromagnetic Interference Using ZnO-PCL Nanocomposites at Microwave Frequency

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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Research paper thumbnail of Transmission Wave Modeling and Calibration in Cavity of Open-Ended Rectangular Waveguide

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Research paper thumbnail of Palm Oil Moisture Monitoring Based On Dielectric Properties At Microwave Frequencies

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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Research paper thumbnail of Modeling of Dielectric Relaxation for Lossy Materials at Microwave Frequencies using Polynomial Approaches

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Research paper thumbnail of Non-destructive Dielectric Measurements and Calibration for Thin Materials Using Waveguide-Coaxial Adaptors

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Research paper thumbnail of MHD flow and mass transfer of a upper-convected Maxwell fluid past a porous shrinking sheet with chemical reaction species

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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Research paper thumbnail of Parallel Solution of High Speed Low Order FDTD on 2D Free Space Wave Propagation

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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Research paper thumbnail of Application of Microwave Moisture Sensor for Determination of Oil Palm Fruit Ripeness

Measurement Science Review, 2010

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Research paper thumbnail of An improvement in speed of FDTD processing time for free space wave propagation

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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Research paper thumbnail of MHD boundary-layer flow of an upper-convected Maxwell fluid in a porous channel

Theoretical and Computational Fluid Dynamics, 2006

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Research paper thumbnail of A Small and Slim Coaxial Probe for Single Rice Grain Moisture Sensing

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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Research paper thumbnail of Heat and mass transfer analysis on the flow of a second grade fluid in the presence of chemical reaction

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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Research paper thumbnail of Series solution for the upper-convected Maxwell fluid over a porous stretching plate

Physics Letters A, 2006

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Research paper thumbnail of Sintering temperature dependence of room temperature magnetic and dielectric properties of Co0.5Zn0.5Fe2O4 prepared using mechanically alloyed nanoparticles

Journal of Magnetism and Magnetic Materials, 2010

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Research paper thumbnail of Microwave characterization of lanthanum iron garnet-filled PVDF-polymer composite using rectangular waveguide at X-band frequency

Journal of Composite Materials, 2012

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Research paper thumbnail of Modeling of Dielectric Relaxation for Lossy Materials at Microwave Frequencies using Polynomial Approaches

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Research paper thumbnail of The role of hydrogen bonding in nanocolloidal amorphous silica particles in electrolyte solutions

Journal of Colloid and Interface Science, 2009

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Research paper thumbnail of A rectangular dielectric waveguide technique for determination of permittivity of materials at Vl-4-band

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Research paper thumbnail of Molecular dynamics simulation of nanocolloidal amorphous silica particles: Part I

The Journal of Chemical Physics, 2007

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Research paper thumbnail of Complex permittivity measurements of Ka-band using rectangular dielectric waveguide

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Research paper thumbnail of Reduction of Electromagnetic Interference Using ZnO-PCL Nanocomposites at Microwave Frequency

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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Research paper thumbnail of Transmission Wave Modeling and Calibration in Cavity of Open-Ended Rectangular Waveguide

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Palm Oil Moisture Monitoring Based On Dielectric Properties At Microwave Frequencies

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

Research paper thumbnail of Modeling of Dielectric Relaxation for Lossy Materials at Microwave Frequencies using Polynomial Approaches

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Non-destructive Dielectric Measurements and Calibration for Thin Materials Using Waveguide-Coaxial Adaptors

Bookmarks Related papers MentionsView impact

Research paper thumbnail of MHD flow and mass transfer of a upper-convected Maxwell fluid past a porous shrinking sheet with chemical reaction species

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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Research paper thumbnail of Parallel Solution of High Speed Low Order FDTD on 2D Free Space Wave Propagation

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

Research paper thumbnail of Application of Microwave Moisture Sensor for Determination of Oil Palm Fruit Ripeness

Measurement Science Review, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of An improvement in speed of FDTD processing time for free space wave propagation

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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Research paper thumbnail of MHD boundary-layer flow of an upper-convected Maxwell fluid in a porous channel

Theoretical and Computational Fluid Dynamics, 2006

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Research paper thumbnail of A Small and Slim Coaxial Probe for Single Rice Grain Moisture Sensing

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

Research paper thumbnail of Heat and mass transfer analysis on the flow of a second grade fluid in the presence of chemical reaction

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

Research paper thumbnail of Series solution for the upper-convected Maxwell fluid over a porous stretching plate

Physics Letters A, 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Sintering temperature dependence of room temperature magnetic and dielectric properties of Co0.5Zn0.5Fe2O4 prepared using mechanically alloyed nanoparticles

Journal of Magnetism and Magnetic Materials, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Microwave characterization of lanthanum iron garnet-filled PVDF-polymer composite using rectangular waveguide at X-band frequency

Journal of Composite Materials, 2012

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Research paper thumbnail of Modeling of Dielectric Relaxation for Lossy Materials at Microwave Frequencies using Polynomial Approaches

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The role of hydrogen bonding in nanocolloidal amorphous silica particles in electrolyte solutions

Journal of Colloid and Interface Science, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A rectangular dielectric waveguide technique for determination of permittivity of materials at Vl-4-band

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Molecular dynamics simulation of nanocolloidal amorphous silica particles: Part I

The Journal of Chemical Physics, 2007

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Research paper thumbnail of Complex permittivity measurements of Ka-band using rectangular dielectric waveguide

Bookmarks Related papers MentionsView impact