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(1 - 5 of 5)
- Title
- Finite element analysis of inhomogeneous waveguides.
- Creator
- Dervain, Suzanne Tai., Florida Atlantic University, Sadiku, Matthew
- Abstract/Description
-
In this thesis, discretized finite element equations were derived and applied to the solution of electromagnetic fields in homogeneous and inhomogeneous waveguides. To improve the accuracy of the results several approaches were taken. Higher order elements were first introduced in the finite element formulation, then a penalty function was applied with explicit boundary conditions, which limit the appearance of nonphysical solutions. The results obtained from the finite element analysis were...
Show moreIn this thesis, discretized finite element equations were derived and applied to the solution of electromagnetic fields in homogeneous and inhomogeneous waveguides. To improve the accuracy of the results several approaches were taken. Higher order elements were first introduced in the finite element formulation, then a penalty function was applied with explicit boundary conditions, which limit the appearance of nonphysical solutions. The results obtained from the finite element analysis were compared to analytical results when available and found to be very accurate.
Show less - Date Issued
- 1988
- PURL
- http://purl.flvc.org/fcla/dt/14448
- Subject Headings
- Finite element method, Wave guides
- Format
- Document (PDF)
- Title
- TRANSMISSION-LINE-MATRIX MODELING OF INHOMOGENEOUS RECTANGULAR WAVEGUIDES AND CAVITIES.
- Creator
- Agba, Lawrence C., Florida Atlantic University, Sadiku, Matthew
- Abstract/Description
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Fortran algorithms were developed to analyze inhomogeneous rectangular waveguides and cavities using the method of transmission-line-matrix. These algorithms were used specifically to determine the field components, impedances, modes, and power decay rates. The computations were done in one, two or three space dimensions and time. Results obtained were compared with analytical results, where possible. In general, the results were found to be in better agreement with the analytical results...
Show moreFortran algorithms were developed to analyze inhomogeneous rectangular waveguides and cavities using the method of transmission-line-matrix. These algorithms were used specifically to determine the field components, impedances, modes, and power decay rates. The computations were done in one, two or three space dimensions and time. Results obtained were compared with analytical results, where possible. In general, the results were found to be in better agreement with the analytical results than the results obtained using other numerical method.
Show less - Date Issued
- 1987
- PURL
- http://purl.flvc.org/fcla/dt/14378
- Subject Headings
- Electromagnetic waves--Mathematical models
- Format
- Document (PDF)
- Title
- Electromagnetic radiation absorption in block models of human bodies.
- Creator
- Jong A Kiem, Raymond Eduard., Florida Atlantic University, Sadiku, Matthew
- Abstract/Description
-
In this thesis an attempt is made to calculate the power absorbed in different parts of a human block model which is located in free space and is exposed to a plane electromagnetic wave. The moment method is applied to solve an integral equation which relates the incident field to the induced electric field in an arbitrarily shaped biological body. To obtain more accurate results, a numerical integration technique developed here has been used. The computations on the induced electric fields...
Show moreIn this thesis an attempt is made to calculate the power absorbed in different parts of a human block model which is located in free space and is exposed to a plane electromagnetic wave. The moment method is applied to solve an integral equation which relates the incident field to the induced electric field in an arbitrarily shaped biological body. To obtain more accurate results, a numerical integration technique developed here has been used. The computations on the induced electric fields compare well with earlier work done in this area. It has been found that there is indeed heating of tissues outside the region of intended treatment in hyperthermia at 80 MHz.
Show less - Date Issued
- 1988
- PURL
- http://purl.flvc.org/fcla/dt/14491
- Subject Headings
- Electromagnetic waves, Human body
- Format
- Document (PDF)
- Title
- Time-domain finite-difference analysis of electromagnetic scattering and penetration problems.
- Creator
- Bemmel, Vincent Egbert., Florida Atlantic University, Sadiku, Matthew
- Abstract/Description
-
The complexity involved in using analytical techniques in solving electromagnetic problems can be avoided by simulating Maxwell's differential equations by finite difference equations, which are easily solved by iteration. In this work some algorithms were developed in order to investigate plane waves as they travel through a certain medium and interact with objects, resulting in scattering and/or penetration. The numerical results were found to be in good agreement with analytical results...
Show moreThe complexity involved in using analytical techniques in solving electromagnetic problems can be avoided by simulating Maxwell's differential equations by finite difference equations, which are easily solved by iteration. In this work some algorithms were developed in order to investigate plane waves as they travel through a certain medium and interact with objects, resulting in scattering and/or penetration. The numerical results were found to be in good agreement with analytical results for tractable cases.
Show less - Date Issued
- 1987
- PURL
- http://purl.flvc.org/fcla/dt/14422
- Subject Headings
- Electromagnetic fields, Maxwell's equations
- Format
- Document (PDF)
- Title
- Performance analysis of token-passing local area networks.
- Creator
- Sadiku, Matthew, Florida Atlantic University, Ilyas, Mohammad, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
A unified performance analysis of token-passing local area networks is reported in this thesis. The primary performance criterion is the mean transfer delay of a message, which is defined as the time from the instant a message becomes available for transmission at a station until the end of its successful reception at the destination. Other performance criteria are power and effective transmission ratio. Analytical expressions for the criteria are derived for exhaustive, gated, and limited...
Show moreA unified performance analysis of token-passing local area networks is reported in this thesis. The primary performance criterion is the mean transfer delay of a message, which is defined as the time from the instant a message becomes available for transmission at a station until the end of its successful reception at the destination. Other performance criteria are power and effective transmission ratio. Analytical expressions for the criteria are derived for exhaustive, gated, and limited service disciplines. Simulation models are also used to support the investigations. The effects of service time distribution (constant, exponential, and hyperexponential) are examined. It is found that under any traffic intensity, service discipline or packet length distribution, token bus gives higher delay and has lower power and lower effective transmission ratio than token ring. Also, the token bus is found to be less sensitive to message length distribution, performing about the same for constant, exponential, and hyperexponential distribution.
Show less - Date Issued
- 1988
- PURL
- http://purl.flvc.org/fcla/dt/14471
- Subject Headings
- Local area networks (Computer networks)
- Format
- Document (PDF)
