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(1 - 5 of 5)
- Title
- A Lime Softening System for Individual-Household Use Powered through Solar Energy.
- Creator
- Slater-Williams, Alexandria, Abtahi, Homayoon, Graduate College
- Abstract/Description
-
In a study conducted by the World Health Organization WHO and United Nations Children’s Fund UNICEF, approximately 768 million people worldwide are not receiving sanitary drinking water suitable for consumption. The greatest levels of water contamination are within the less developed countries where individuals are unable to afford modern water treatment facilities. While there are many water treatment methods, lime softening proves to be one of the more effective approaches as it removes...
Show moreIn a study conducted by the World Health Organization WHO and United Nations Children’s Fund UNICEF, approximately 768 million people worldwide are not receiving sanitary drinking water suitable for consumption. The greatest levels of water contamination are within the less developed countries where individuals are unable to afford modern water treatment facilities. While there are many water treatment methods, lime softening proves to be one of the more effective approaches as it removes calcium, magnesium, arsenic, barium, beryllium, chromium, cooper, fluoride, lead, mercury, cadmium, nickel, uranium, radium, and radionuclides under the correct conditions. The US Environmental Protection Agency EPA has even defined lime softening as the best available technology BAT for removing uranium and radium. The issue with lime softening is that it is typically used for larger systems that serve whole communities. This project utilizes previous knowledge of lime softening to design a cost-efficient water clarification system with the ability to function on an individual-household basis while being powered by a solar unit. By condensing the system, we hope to make lime softening technology available for a wider spectrum of societies and expend the applications of lime softening.
Show less - Date Issued
- 2014
- PURL
- http://purl.flvc.org/fau/fd/FA00005167
- Format
- Document (PDF)
- Title
- The effect of pulsing the oxidant flow on PEM fuel cell performance.
- Creator
- Fuchs, Michel., Florida Atlantic University, Abtahi, Homayoon
- Abstract/Description
-
Verification of a numerical model, used to describe the processes within a PEM Fuel Cell, revealed interesting results in the fuel cell's performance. To verify the transient response of the model, the oxidant supplied to the fuel cell was pulsed at various frequencies, which led to improvements in performance. In addition two novel methods to help determine the operating conditions within a PEM Fuel Cell were developed. The first method utilized several thermocouples, evenly spaced over the...
Show moreVerification of a numerical model, used to describe the processes within a PEM Fuel Cell, revealed interesting results in the fuel cell's performance. To verify the transient response of the model, the oxidant supplied to the fuel cell was pulsed at various frequencies, which led to improvements in performance. In addition two novel methods to help determine the operating conditions within a PEM Fuel Cell were developed. The first method utilized several thermocouples, evenly spaced over the site of reaction to monitor regional temperatures, while the second method utilized a special sensor to detect regional moisture conditions. All aspects of the verification process met with limited success, since the proper level of humidification to the fuel cell was not achieved.
Show less - Date Issued
- 1998
- PURL
- http://purl.flvc.org/fcla/dt/15595
- Subject Headings
- Fuel cells
- Format
- Document (PDF)
- Title
- Design of an Aquatic Quadcopter with Optical Wireless Communications.
- Creator
- Haller, Patterson, Abtahi, Homayoon, Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
With a focus on dynamics and control, an aquatic quadcopter with optical wireless communications is modeled, designed, constructed, and tested. Optical transmitter and receiver circuitry is designed and discussed. By utilization of the small angle assumption, the nonlinear dynamics of quadcopter movement are linearized around an equilibrium state of zero motion. The set of equations are then tentatively employed beyond limit of the small angle assumption, as this work represents an initial...
Show moreWith a focus on dynamics and control, an aquatic quadcopter with optical wireless communications is modeled, designed, constructed, and tested. Optical transmitter and receiver circuitry is designed and discussed. By utilization of the small angle assumption, the nonlinear dynamics of quadcopter movement are linearized around an equilibrium state of zero motion. The set of equations are then tentatively employed beyond limit of the small angle assumption, as this work represents an initial explorative study. Specific constraints are enforced on the thrust output of all four rotors to reduce the multiple-input multiple-output quadcopter dynamics to a set of single-input single-output systems. Root locus and step response plots are used to analyze the roll and pitch rotations of the quadcopter. Ultimately a proportional integral derivative based control system is designed to control the pitch and roll. The vehicle’s yaw rate is similarly studied to develop a proportional controller. The prototype is then implemented via an I2C network of Arduino microcontrollers and supporting hardware.
Show less - Date Issued
- 2016
- PURL
- http://purl.flvc.org/fau/fd/FA00004786, http://purl.flvc.org/fau/fd/FA00004786
- Subject Headings
- Autonomous robots--Design and construction., Embedded computer systems--Design and construction., Wireless communication systems., Artificial intelligence., Optical pattern recognition., Computer vision.
- Format
- Document (PDF)
- Title
- A lime softening system for individual-household use powered by solar energy.
- Creator
- Slater-Williams, Alexandria, Abtahi, Homayoon, Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
A study conducted by the World Health Organization and United Nations Children's Fund, concluded that approximately 768 million people worldwide are not receiving sanitary drinking water suitable for consumption. While there are many water treatment methods, lime softening proves to be one of the more effective approaches as it removes a wide variety of harmful compounds including arsenic, lead, mercury, and cadmium under the correct conditions. The greatest issues with lime softening on a...
Show moreA study conducted by the World Health Organization and United Nations Children's Fund, concluded that approximately 768 million people worldwide are not receiving sanitary drinking water suitable for consumption. While there are many water treatment methods, lime softening proves to be one of the more effective approaches as it removes a wide variety of harmful compounds including arsenic, lead, mercury, and cadmium under the correct conditions. The greatest issues with lime softening on a smaller scale include the complexity of the chemistry and need for monitoring. By designing the system for groundwater sources and with a smaller capacity, this thesis hoped to reduce the level of monitoring, chemical expertise, and cost needed for operation. While promising results occurred in the removal of arsenic and total hardness, this project was unable to obtain consistent results and final water samples with pH values between the recommended standard of 6.5 to 8.
Show less - Date Issued
- 2015
- PURL
- http://purl.flvc.org/fau/fd/FA00004412, http://purl.flvc.org/fau/fd/FA00004412
- Subject Headings
- Solar energy -- Economic aspects, Water -- Purification, Water -- Purification Water -- Softening, Water quality management, Water supply -- Design and construction, Water supply engineering
- Format
- Document (PDF)
- Title
- Experimental and numerical analysis of solute transport through saturated porous media.
- Creator
- Ranganathan, Sridhar., Florida Atlantic University, Abtahi, Homayoon, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
The problem of solute transport through saturated porous media is considered in this thesis. The end application of this study is to evaluate the option of spray irrigation as a means of disposing reverse osmosis effluent. Reverse osmosis effluent was sprayed on an experimental field composed of typical area soil. The changes in groundwater quality were monitored at intervals of ten to twenty days. Applying the experimentally obtained data to a basic numerical model, which uses the convection...
Show moreThe problem of solute transport through saturated porous media is considered in this thesis. The end application of this study is to evaluate the option of spray irrigation as a means of disposing reverse osmosis effluent. Reverse osmosis effluent was sprayed on an experimental field composed of typical area soil. The changes in groundwater quality were monitored at intervals of ten to twenty days. Applying the experimentally obtained data to a basic numerical model, which uses the convection-diffusion equation, the key parameter of the soil, D* the diffusion coefficient, is obtained for the Myakka sand. While the numerical model can predict the qualitative behavior of hardness and conductivity, hysteresis is observed for the response of the total organic carbon (TOC) content. Further studies are needed to understand and model the inherent capacitance of the soil for hardness and the observed hysteresis in TOC response.
Show less - Date Issued
- 1990
- PURL
- http://purl.flvc.org/fcla/dt/14629
- Subject Headings
- Groundwater flow, Groundwater--Quality, Water--Purification--Reverse osmosis process
- Format
- Document (PDF)
