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Vanderbilt University
1.
Mitchell, Jason Edward.
Design of modular self contained knee and ankle prostheses.
Degree: PhD, Mechanical Engineering, 2014, Vanderbilt University
URL: http://hdl.handle.net/1803/14523 
► Losing a lower limb and specifically the power that it generates, has a major impact on ambulation including having to expend more metabolic energy and…
(more)
▼ Losing a lower limb and specifically the power that it generates, has a major impact on ambulation including having to expend more metabolic energy and exert more hip power and torque on the affected side. There are currently a small number of commercially available
powered prostheses but they are not capable of providing the full range of motion and power of the lost limb. Additionally there are no prostheses which have both a
powered knee and ankle joint. It is the hypothesis of this work that lower limb prosthetic devices can be designed which provide biomechanically normal levels of torque, speed, and range of motion in self-contained, reliable, quiet, and anatomical packages. Described herein is the mechanical design, development and testing of several such devices. Initial work focused on the development of several key components including a ground contact sensing load cell, a biasing spring foot, and a robust and compact transmission design. Subsequent work incorporated these components into a transfemoral prosthesis with
powered knee and ankle joints. In addition, a transtibial version was fabricated with a
powered ankle joint. Both of these designs conform closely to the anatomical envelope of an average sized male limb. Experiments with amputee subjects validate the design through the demonstration of kinematics and kinetics that closely match those of the lost limb.
Advisors/Committee Members: Robert Webster (committee member), Eric Barth (committee member), Paul King (committee member), George Cook (committee member), Michael Goldfarb (Committee Chair).
Subjects/Keywords: powered prosthetic
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APA (6th Edition):
Mitchell, J. E. (2014). Design of modular self contained knee and ankle prostheses. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/14523
Chicago Manual of Style (16th Edition):
Mitchell, Jason Edward. “Design of modular self contained knee and ankle prostheses.” 2014. Doctoral Dissertation, Vanderbilt University. Accessed January 22, 2021.
http://hdl.handle.net/1803/14523.
MLA Handbook (7th Edition):
Mitchell, Jason Edward. “Design of modular self contained knee and ankle prostheses.” 2014. Web. 22 Jan 2021.
Vancouver:
Mitchell JE. Design of modular self contained knee and ankle prostheses. [Internet] [Doctoral dissertation]. Vanderbilt University; 2014. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1803/14523.
Council of Science Editors:
Mitchell JE. Design of modular self contained knee and ankle prostheses. [Doctoral Dissertation]. Vanderbilt University; 2014. Available from: http://hdl.handle.net/1803/14523
Delft University of Technology
2.
Wheeler, Lanleigh (author).
MAR-HAB: Mars Hot Air Balloon.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:072b651a-c8b1-4f83-bc41-e1f359827c91
► Human exploration on Mars is nearing actualisation and the space industry is therefore in need of vehicles with the capability of transporting goods and exploring…
(more)
▼ Human exploration on Mars is nearing actualisation and the space industry is therefore in need of vehicles with the capability of transporting goods and exploring the surrounding area. Current Mars rovers by NASA, such as the Curiosity, provide excellent researching capabilities from a remote location. However, these land based drones are slower and less manoeuvrable around obstacles than airborne vehicles would be. Due to the need of transportation and exploration, this report aims to get acquainted with current research on Mars flight and provide a preliminary design concept enforced by the following mission goal: ”To aid future Mars colonists by providing a feasibility study of a flying vehicle capable of carrying a predetermined payload.” To approach this goal, it was decided to determine which flying vehicle concept would be the most optimal in a Martian atmosphere via a trade-off analysis. Four options were considered and a balloon was deemed more optimal for a Martian environment compared to aircraft, rotor craft and flapping wing vehicles. The main reasons for this are that the balloon is the most power efficient and is a design that provides the least amount of risk concerning likelihood of failure and safety of astronauts.Thereafter, the process required to design a hot air balloon and the programming of the code is described. Results indicate that a balloon with a prolate ellipsoid shape is optimal with the ratio between the minor and major axis being 0.41, therefore resulting in a balloon with a major axis radius of 33.8 푚 and a minor axis radius of 13.86 푚. A surface area of 131.58푚² is selected for the flexible solar cells which have been calculated to be able to power a two propeller system ensuring that the balloon can counter headwinds of up to 15푚/푠. Finally, to ensure altitude control is possible, a venting system is applied on the top of the balloon ensuring a venting volume of 117푚³ is possible. This is enough to ensure the balloon can land, take-off and control its altitude as desired.This thesis is therefore able to provide an initial design for a Mars exploration balloon capable of controlling not only its altitude but also its position. This is achieved by using the solar energy to increase the balloon’s temperature and a vent area of 19.03 푚² to control this temperature. All this provides a design that can be controlled and meets the versatility requirement as it is capable of carrying a variety of heavy payloads and fly past ground obstacles
Advisors/Committee Members: Menicucci, Alessandra (mentor), Stam, Daphne (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Mars; Balloon; Solar Powered
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APA (6th Edition):
Wheeler, L. (. (2020). MAR-HAB: Mars Hot Air Balloon. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:072b651a-c8b1-4f83-bc41-e1f359827c91
Chicago Manual of Style (16th Edition):
Wheeler, Lanleigh (author). “MAR-HAB: Mars Hot Air Balloon.” 2020. Masters Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:072b651a-c8b1-4f83-bc41-e1f359827c91.
MLA Handbook (7th Edition):
Wheeler, Lanleigh (author). “MAR-HAB: Mars Hot Air Balloon.” 2020. Web. 22 Jan 2021.
Vancouver:
Wheeler L(. MAR-HAB: Mars Hot Air Balloon. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:072b651a-c8b1-4f83-bc41-e1f359827c91.
Council of Science Editors:
Wheeler L(. MAR-HAB: Mars Hot Air Balloon. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:072b651a-c8b1-4f83-bc41-e1f359827c91
Delft University of Technology
3.
de Jong, Randy (author).
Phase switching dynamics for body-powered hand prostheses: Design of a booster to passively switch between phase dynamics.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:f8d9d61a-b9fd-4a1a-b40f-6f81f6225425
► Body-powered prosthetic hands used by below-elbow amputees function in two phases. There is the opening and closing motion of the hand (Motion Phase) and the…
(more)
▼ Body-powered prosthetic hands used by below-elbow amputees function in two phases. There is the opening and closing motion of the hand (Motion Phase) and the phase when the hand is in contact with an object, and the fingers apply a pinching force (Pinching Phase). Each phase requires a different set of dynamics to properly function. In the Motion Phase, a small amount of applied force must result in a large translation of the fingers, in the Pinching Phase a small amount of force must result in a large pinching force and a small translation. The problem is that body-powered prostheses have fast motion given a low force input during the motion phase but cannot achieve a high pinching force with a low force input during the pinching phase. The goal of the project is to design a mechanism that passively switches between the dynamics of the motion phase and pinching phase for body-powered active closing hook prostheses. In the motion phase a small force input must result in a large output translation and in the pinching phase a small force input must result in a larger force output and a small output translation. In the motion phase a minimum cable force of 10 N is required and in the pinching phase a pinching force of 30 N must be achieved with an input force of 40 N or less The prototype consists of a hydraulic telemanipulation system with a master (shoulder), operated by the shoulder harness, and slave (hand), operates the hand prosthesis, cylinder connected to each other via a booster mechanism. The booster is inactive in the motion phase and active in the pinching phase. The results show that in the motion phase an input force of 5 N can perform the full translation of the prosthesis. If the hand is met with resistance the input 5 N input can increase up to 24 N until the pinching phase activates. The translation in the pinching phase is too small to observe any change. The pinching phase activates at a pinching force of 12 N and an input force of 24 N. In the pinching phase the pinching force reaches 35 N with an input force of 32 N input force. The dynamics of the phases show to be unaffected by different object stiffnesses and lowering the activation force of the pinching phase only shifts the pinching phase along the motion phase. In conclusion the 5 N minimum input force is too low. An input force below 10 N result in inferior control for the user. In the pinching phase an input force of 32 N can reach a pinching force of 35 N, which meets the set requirements of 30 N pinching force with an input force of 40 N or less. A larger translation is required in the pinching phase to compare the translation dynamics between the motion and pinching phase. More research is required to properly define the desired activation force, how much translation is required in the pinching phase, and to find optimal spring properties for the return springs in the hydraulic cylinders.
BioMedical Engineering
Advisors/Committee Members: Plettenburg, D.H. (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Prosthetics; upper limb; body-powered
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APA ·
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APA (6th Edition):
de Jong, R. (. (2020). Phase switching dynamics for body-powered hand prostheses: Design of a booster to passively switch between phase dynamics. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:f8d9d61a-b9fd-4a1a-b40f-6f81f6225425
Chicago Manual of Style (16th Edition):
de Jong, Randy (author). “Phase switching dynamics for body-powered hand prostheses: Design of a booster to passively switch between phase dynamics.” 2020. Masters Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:f8d9d61a-b9fd-4a1a-b40f-6f81f6225425.
MLA Handbook (7th Edition):
de Jong, Randy (author). “Phase switching dynamics for body-powered hand prostheses: Design of a booster to passively switch between phase dynamics.” 2020. Web. 22 Jan 2021.
Vancouver:
de Jong R(. Phase switching dynamics for body-powered hand prostheses: Design of a booster to passively switch between phase dynamics. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:f8d9d61a-b9fd-4a1a-b40f-6f81f6225425.
Council of Science Editors:
de Jong R(. Phase switching dynamics for body-powered hand prostheses: Design of a booster to passively switch between phase dynamics. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:f8d9d61a-b9fd-4a1a-b40f-6f81f6225425
University of Texas – Austin
4.
Khan, Talha Ahmed.
Analysis and design of energy harvesting wireless communication systems.
Degree: PhD, Electrical and Computer Engineering, 2018, University of Texas – Austin
URL: http://hdl.handle.net/2152/63697
► Wireless-powered communication is an emerging technology for powering the large number of miniature devices of the future. In a wireless-powered communication system, low-power sensors extract…
(more)
▼ Wireless-
powered communication is an emerging technology for powering the
large number of miniature devices of the future. In a wireless-
powered communication system, low-power sensors extract energy from the incident wireless signals to
power their operations such as information transmission, sensing or reception. Due to sporadic energy availability, however, such a system is fundamentally different from
a traditionally-
powered communication system. This dissertation investigates three distinct aspects of wireless-
powered communications to get insights on the system operation. First, leveraging concepts from finite-length information theory, an analytical framework is developed for examining wireless-
powered communications with short packets, i.e., in the finite blocklength regime. This is relevant as remotely-
powered communications may entail short packets due to small payloads, low-latency requirements, or limited energy to support a longer transmission. Second, using a stochastic geometry framework, an analytical model is developed for characterizing the performance of wireless-
powered communications in the millimeter wave (mmWave) band. The proposed model incorporates the key features of mmWave systems such as directional beamforming and sensitivity to building blockages. Finally, the power transfer efficiency and the energy efficiency of a wireless-
powered communication system aided by massive MIMO is characterized. The broad goal of this dissertation is to better understand wireless-
powered communications in the context of the emerging technologies for 5G.
Advisors/Committee Members: Heath, Robert W., Jr, 1973- (advisor), Andrews, Jeffrey G (committee member), Thomaz Jr., Edison (committee member), Vikalo, Haris (committee member), Orlik, Philip (committee member).
Subjects/Keywords: Energy harvesting; Wireless-powered communications
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APA (6th Edition):
Khan, T. A. (2018). Analysis and design of energy harvesting wireless communication systems. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/63697
Chicago Manual of Style (16th Edition):
Khan, Talha Ahmed. “Analysis and design of energy harvesting wireless communication systems.” 2018. Doctoral Dissertation, University of Texas – Austin. Accessed January 22, 2021.
http://hdl.handle.net/2152/63697.
MLA Handbook (7th Edition):
Khan, Talha Ahmed. “Analysis and design of energy harvesting wireless communication systems.” 2018. Web. 22 Jan 2021.
Vancouver:
Khan TA. Analysis and design of energy harvesting wireless communication systems. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2018. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/2152/63697.
Council of Science Editors:
Khan TA. Analysis and design of energy harvesting wireless communication systems. [Doctoral Dissertation]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/63697
Delft University of Technology
5.
van Houts, C.P.A. (author).
Design of a multifunctional body powered prosthetic hand.
Degree: 2021, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:760e3d57-c4fa-47ec-a971-6dac4e140aa2
► Nowadays the design of prosthetic hands is mainly focused on myo-electric control for more functionality. And easy producible 3d printed prosthetics to lower the costs…
(more)
▼ Nowadays the design of prosthetic hands is mainly focused on myo-electric control for more functionality. And easy producible 3d printed prosthetics to lower the costs of a custom prosthesis. As a result of this change of focus, the body powered prosthetic hands currently on the market are mainly simple clamping mechanisms with no innovative functions. Looking back into the history of hand prosthetics many body powered prosthetic hands housed a couple of innovative design choices to increase the functionality. Some examples of this are the Pringle-Kirk arm and the Despinasse hand. As a counter reaction to this movement, a new body powered prosthetic hand is designed. The new prosthetic hand will be based on the innovative solutions of the past and will bring back more functionalities to the body powered prosthetics. The new design housed fingers made out of cylindrical springs, in combination with leaf springs. This is all actuated via a dependency mechanism in the hand palm, this combination allows for very flexible fingers that can grab complexly shaped objects and still offer a multi finger grip. The first tests revealed that the leaf springs limited the motion of the fingers and further testing without the leaf springs showed a setup with only cylindrical springs was a better solution. The second test was focused on pinch force, although the maximum acquired pinch force was not high, a sturdy grip should be possible based on literature, this does need further testing to validate. For the continuing of the prototyping testing of the dependency mechanism was done, initial testing at a larger scale showed promising results, little to no loss of force. The conclusion that can be drawn based on these tests is that there are certainly parts of prosthetic hands of the past that are worth taking a closer look at.
BioMedical Engineering
Advisors/Committee Members: van der Helm, F.C.T. (mentor), Plettenburg, D.H. (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: prosthesis design; body powered; hand
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APA (6th Edition):
van Houts, C. P. A. (. (2021). Design of a multifunctional body powered prosthetic hand. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:760e3d57-c4fa-47ec-a971-6dac4e140aa2
Chicago Manual of Style (16th Edition):
van Houts, C P A (author). “Design of a multifunctional body powered prosthetic hand.” 2021. Masters Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:760e3d57-c4fa-47ec-a971-6dac4e140aa2.
MLA Handbook (7th Edition):
van Houts, C P A (author). “Design of a multifunctional body powered prosthetic hand.” 2021. Web. 22 Jan 2021.
Vancouver:
van Houts CPA(. Design of a multifunctional body powered prosthetic hand. [Internet] [Masters thesis]. Delft University of Technology; 2021. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:760e3d57-c4fa-47ec-a971-6dac4e140aa2.
Council of Science Editors:
van Houts CPA(. Design of a multifunctional body powered prosthetic hand. [Masters Thesis]. Delft University of Technology; 2021. Available from: http://resolver.tudelft.nl/uuid:760e3d57-c4fa-47ec-a971-6dac4e140aa2
AUT University
6.
Maringka, Paulus.
Greencycle
.
Degree: 2010, AUT University
URL: http://hdl.handle.net/10292/1059
► This Greencycle project applies a system approach to shift design thinking and practices away from the ongoing unsustainable use of resources towards a more sustainable…
(more)
▼ This Greencycle project applies a system approach to shift design thinking and practices away from the ongoing unsustainable use of resources towards a more sustainable framework of consumption whereby local cultures, skills, resources and technology are analyzed to inform the design and development of a human
powered transportation system. It uses a trans-disciplinary research and design approach by consulting all stakeholders; including farmers in a Third World country, industrial designers, engineers and manufacturers to provide information, understanding and insights as a basis to find solutions that have enabled this research study to produce a system called Greencycle which utilizes renewable materials and indigenous people skills to produce a bicycle that is more sustainable. The bicycle provides more than basic transportation to go from A to B. Poor countries need and depend on this mode of transportation for a wide range of uses; thus expanding its function and uses would be of great benefit to its users. This research study has created a series of accessories to extend a bicycle’s functionality, with the core being made from sustainable materials and local skills. For this project it would have been a simple process for the designer to come up with a concept idea(s) that was based on a personal view of what would be a suitable solution for the target user. Instead however, the designer has used feedback from the target group participants to shape and develop the design process and to ensure the design will be acceptable for the target user to use and manufacture. This research study has included four expert interviews, eleven case studies of target users, prototype testing and field experiments with sustainable resources to gather information, understanding and insights from these stakeholders in order to propose, design and evaluate two Greencycles (using sustainable bamboo material) and a series of design accessories. This multi-discipline approach to the design problem has revealed many opportunities that would otherwise be hidden by less detailed research and design methodology. Many academic studies stop at the point when the written thesis is complete. This research project went a step further by testing and implementing its findings on users back in its intended marketplace to ensure the design will be adopted by and be successful for people in Third World countries. As a result of this research, there is now an opportunity to look at and create a business model that provides new income opportunities for the local people. Feedback for the Greencycle design and its accessories has so far been very encouraging, with participants showing a significant level of enthusiasm. To take advantage of this success, a business proposition to market these sustainable products seems plausible as a first step to developing this business venture. Information posters to showcase the accessories and their functions and applications have been designed to test market demands and other important indicators for future…
Advisors/Committee Members: Yap, Leong (advisor).
Subjects/Keywords: Greencycle;
Human-powered;
Sustainability;
Transportation;
Culture;
Recycle
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APA (6th Edition):
Maringka, P. (2010). Greencycle
. (Thesis). AUT University. Retrieved from http://hdl.handle.net/10292/1059
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Maringka, Paulus. “Greencycle
.” 2010. Thesis, AUT University. Accessed January 22, 2021.
http://hdl.handle.net/10292/1059.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Maringka, Paulus. “Greencycle
.” 2010. Web. 22 Jan 2021.
Vancouver:
Maringka P. Greencycle
. [Internet] [Thesis]. AUT University; 2010. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10292/1059.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Maringka P. Greencycle
. [Thesis]. AUT University; 2010. Available from: http://hdl.handle.net/10292/1059
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
7.
Mohamed, R. (author).
Bamboo Prehensor for the developing countries.
Degree: 2011, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:8d3779cc-b463-4dae-9e35-e14a7420e0de
► It is estimated that 25 million people around the world suffer from upper limb amputation. 82% of these amputees live in developing countries and usually…
(more)
▼ It is estimated that 25 million people around the world suffer from upper limb amputation. 82% of these amputees live in developing countries and usually find it difficult to provide for their families because they depend on physical labor. At first glance it would seem that the solution is simple, the use of a prosthesis. However currently available upper limb prostheses are beyond the capabilities of most of the people in the developing countries. Thus there is a need for a prosthesis that can be easily manufactured in the developing countries and which is affordable for the individuals. Bamboo is a material that can be found in most developing countries, it has a good combination of properties such as specific strength and specific stiffness. Therefore, the goal of this research project is to make a body powered hand prosthesis out of bamboo. The prosthesis uses a combination of levers to move and to provide high gripping force with a low actuation force. However, the results show that there is a high energy loss occurring at the joints of the levers. Furthermore, the operating force is high (120 N) and the grasping force is low (14 N). However, by adjusting the position of the cable and spring the operating force can be reduced while the grasping force is increased. Thus, it can be stated that a prosthesis made out of bamboo is a feasible option; but the performance of the prosthesis is very sensitive to the accuracy of the manufacturing process. ?
BME
BioMechanical Engineering
Mechanical, Maritime and Materials Engineering
Advisors/Committee Members: Van der Helm, F.C.T. (mentor), Plettenburg, D.H. (mentor), Smit, G. (mentor).
Subjects/Keywords: Bamboo Body powered prosthesis prehensor developing countries
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APA (6th Edition):
Mohamed, R. (. (2011). Bamboo Prehensor for the developing countries. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8d3779cc-b463-4dae-9e35-e14a7420e0de
Chicago Manual of Style (16th Edition):
Mohamed, R (author). “Bamboo Prehensor for the developing countries.” 2011. Masters Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:8d3779cc-b463-4dae-9e35-e14a7420e0de.
MLA Handbook (7th Edition):
Mohamed, R (author). “Bamboo Prehensor for the developing countries.” 2011. Web. 22 Jan 2021.
Vancouver:
Mohamed R(. Bamboo Prehensor for the developing countries. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:8d3779cc-b463-4dae-9e35-e14a7420e0de.
Council of Science Editors:
Mohamed R(. Bamboo Prehensor for the developing countries. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:8d3779cc-b463-4dae-9e35-e14a7420e0de
Delft University of Technology
8.
van Pelt, T. (author).
VHESPA 2.0: The Design of a Very High Endurance Solar Powered Aircraft.
Degree: 2016, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:f3623072-19ab-4906-accd-2d28fa0cf141
► With the upcoming trend in electric aviation a good model that describes how the solar spectrum depends on altitude and solar zenith angle can ease…
(more)
▼ With the upcoming trend in electric aviation a good model that describes how the solar spectrum depends on altitude and solar zenith angle can ease the design process significantly. Knowing what solar spectrum to expect makes it possible to design the solar system of an aircraft more efficiently as the optimal incoming energy is included in the weight estimation. However, not only solar powered aircraft bene t from this model. Solar systems in rural mountain areas can use this model to predict more precisely the energy yield of solar systems and their return on investment. In this thesis a model for the prediction of the solar spectrum for various altitudes and solar angles is proposed. This model, that uses the physics of Rayleigh scattering and light absorption to determine the solar spectrum, is found to be accurate for clear skies without clouds and low turbidity. This is because when clear skies are assumed the majority of light interaction can be described by Rayleigh scattering and light absorption. To obtain reliable spectra at cloudy days one needs to include Mie and non-selective scattering to the model. To prove that this model can ease the design process of solar powered aircraft a case study has been performed that focuses on the design of a two-manned solar powered aircraft capable of crossing the globe. This aircraft, also known as a Very High Endurance Solar Powered Aircraft (VHESPA), has been subject to a new weight prediction model. This new weight prediction model has been based on the model proposed by Noth that uses reference solar powered aircraft together with battery and propulsion technology research to come up with a first order weight estimation of solar powered aircraft. To con rm the correctness of this model the designed aircraft has undergone a simulation that reproduces the incoming solar power as well as the power required for continuous flight and the power choices that need to be made throughout the day. It has been found that an aircraft designed using this new weight estimation model gives a reliable first order solar powered aircraft design.
Electrical Engineering, Mathematics and Computer Science
Electrical Sustainable Energy / Photovoltaic Materials and Devices
Sustainable Energy Technology
Advisors/Committee Members: Smets, A.H.M. (mentor).
Subjects/Keywords: Solar Powered Aircraft; Light; Solar spectrum; Design
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APA (6th Edition):
van Pelt, T. (. (2016). VHESPA 2.0: The Design of a Very High Endurance Solar Powered Aircraft. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:f3623072-19ab-4906-accd-2d28fa0cf141
Chicago Manual of Style (16th Edition):
van Pelt, T (author). “VHESPA 2.0: The Design of a Very High Endurance Solar Powered Aircraft.” 2016. Masters Thesis, Delft University of Technology. Accessed January 22, 2021.
http://resolver.tudelft.nl/uuid:f3623072-19ab-4906-accd-2d28fa0cf141.
MLA Handbook (7th Edition):
van Pelt, T (author). “VHESPA 2.0: The Design of a Very High Endurance Solar Powered Aircraft.” 2016. Web. 22 Jan 2021.
Vancouver:
van Pelt T(. VHESPA 2.0: The Design of a Very High Endurance Solar Powered Aircraft. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2021 Jan 22].
Available from: http://resolver.tudelft.nl/uuid:f3623072-19ab-4906-accd-2d28fa0cf141.
Council of Science Editors:
van Pelt T(. VHESPA 2.0: The Design of a Very High Endurance Solar Powered Aircraft. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:f3623072-19ab-4906-accd-2d28fa0cf141
Georgia Tech
9.
Niu, Simiao.
Theory of triboelectric nanogenerators for self-powered systems.
Degree: PhD, Materials Science and Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/54954
► Energy science is becoming an increasingly important multi-disciplinary area, for not only addressing the worldwide energy crisis, but also realizing desired power sources with advanced…
(more)
▼ Energy science is becoming an increasingly important multi-disciplinary area, for not only addressing the worldwide energy crisis, but also realizing desired power sources with advanced features for portable electronic devices and sensor networks. Very recently, based on triboelectric effect and electrostatic induction, a fundamentally new technology, triboelectric nanogenerator, has been demonstrated which shows unique merits. But so far, the main limitation for continuing optimizing their output performance is a lack of fundamental understanding of their core working mechanism. In this thesis research, we first unveil the fundamental theory and output characteristics of triboelectric nanogenerators. Then, we apply the developed theory to the TENG-based self-
powered system design. We have developed the first genuine self-
powered system to meet mW requirement of personal electronics. The system includes a multilayered TENG, a power management circuit with 60% total efficiency, and a low leakage energy storage device. Our power management circuit provides the total efficiency that is about two magnitudes higher than the traditional direct charging. And the total system performance is 330 times higher than the state-of-art designs. Driven by palm tapping, this power unit can provide a continuous DC electricity of 1.044 mW on average power in a regulated and managed manner that can be universally applied as a standard power source for continuously driving numerous conventional electronics, such as a thermometer, a heart rate monitor (electrocardiograph/ECG system), a pedometer, a wearable electronic watch, a scientific calculator, and a wireless radio-frequency communication system. Our study demonstrates the first power unit that utilizes widely accessible biomechanical energy source to sustainably drive a broad range of commercial mobile and wearable electronic devices. This self-charging unit is a paradigm shift towards infinite-lifetime energy sources that can never be achieved solely by batteries.
Advisors/Committee Members: Wang, Zhong Lin (advisor), Liu, Meilin (committee member), Cressler, John D. (committee member), Dupuis, Russell D. (committee member), Ayazi, Farrokh (committee member).
Subjects/Keywords: Triboelectric nanogenerators; Self-powered systems; Simulation
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APA (6th Edition):
Niu, S. (2016). Theory of triboelectric nanogenerators for self-powered systems. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54954
Chicago Manual of Style (16th Edition):
Niu, Simiao. “Theory of triboelectric nanogenerators for self-powered systems.” 2016. Doctoral Dissertation, Georgia Tech. Accessed January 22, 2021.
http://hdl.handle.net/1853/54954.
MLA Handbook (7th Edition):
Niu, Simiao. “Theory of triboelectric nanogenerators for self-powered systems.” 2016. Web. 22 Jan 2021.
Vancouver:
Niu S. Theory of triboelectric nanogenerators for self-powered systems. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1853/54954.
Council of Science Editors:
Niu S. Theory of triboelectric nanogenerators for self-powered systems. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/54954
University of North Texas
10.
Dhayal, Vandana Sultan Singh.
Exploring Simscape™ Modeling for Piezoelectric Sensor Based Energy Harvester.
Degree: 2017, University of North Texas
URL: https://digital.library.unt.edu/ark:/67531/metadc984261/
► This work presents an investigation of a piezoelectric sensor based energy harvesting system, which collects energy from the surrounding environment. Increasing costs and scarcity of…
(more)
▼ This work presents an investigation of a piezoelectric sensor based energy harvesting system, which collects energy from the surrounding environment. Increasing costs and scarcity of fossil fuels is a great concern today for supplying power to electronic devices. Furthermore, generating electricity by ordinary methods is a complicated process. Disposal of chemical batteries and cables is polluting the nature every day. Due to these reasons, research on energy harvesting from renewable resources has become mandatory in order to achieve improved methods and strategies of generating and storing electricity. Many low power devices being used in everyday life can be
powered by harvesting energy from natural energy resources. Power overhead and power energy efficiency is of prime concern in electronic circuits. In this work, an energy harvester is modeled and simulated in Simscape™ for the functional analysis and comparison of achieved outcomes with
previous work. Results demonstrate that the harvester produces power in the 0 μW to 100 μW range, which is an adequate amount to provide supply to low power devices. Power efficiency calculations also demonstrate that the implemented harvester is capable of generating and storing power for low power pervasive applications.
Advisors/Committee Members: Mohanty, Saraju P., Kougianos, Elias, Caragea, Cornelia.
Subjects/Keywords: Piezoelectric Sensor; Energy Harveter; Self Powered
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University of Canterbury
11.
Fernandez, Rajan.
Oscillating Hydrofoil Propulsion for Human-Powered Watercraft Applications.
Degree: PhD, Mechanical Engineering, 2013, University of Canterbury
URL: http://dx.doi.org/10.26021/3135
► Unlike conventional propellers, flapping wings may generate large amplitude oscillating forces, which can make them difficult to incorporate into a craft design. This is particularly…
(more)
▼ Unlike conventional propellers, flapping wings may generate large amplitude oscillating forces, which can make them difficult to incorporate into a craft design. This is particularly true for a single, vertically oscillating hydrofoil, as part of a surface water craft where the cyclic lift of the hydrofoil disrupts the craft stability. This thesis begins by reviewing the history of human-powered watercraft with a focus on those having flapping foil propellers. This review combined with a review of the literature provides a balanced overview on how flapping wing propellers are currently designed. Current literature shows that although the mean performance of an oscillating foil has been determined in terms of the Strouhal number and the angle of attack, relatively little describes performance directly in terms of the foil motion. Hence, predicting temporal hydrodynamic forces acting on an oscillating foil is difficult. This provides motivation for research investigating the temporal performance of an oscillating foil directly in terms of its motion.
In this thesis, experimental equipment designed to measure the hydrodynamic forces on a heaving object is presented. Key features of the equipment are analysed to show how measurement accuracy is maintained. Experimental measurements of unsteady hydrodynamic forces acting on a heaving cylinder, flat plate, symmetrical foil, and an asymmetrical foil are analysed with respect to the heaving motion. Firstly, the object motion is limited to one degree of freedom; pure heaving with zero forward velocity, to investigate the start-up conditions of the oscillating hydrofoil propeller. Secondly, these results are expanded on by adding a steady forward velocity component to the object motion to investigate how the hydrodynamic forces on the object are affected by the cross-flow.
Experimental temporal hydrodynamic force measurements presented in this thesis show how the relative composition of hydrodynamic drag and inertia forces change with oscillating frequency, and forward velocity, affecting the phase, magnitude, and profile of the force cycles. This composition is also influenced by the cross-section of the oscillating object and the presence of a free surface. Current marine engineering equations for unsteady hydrodynamic forces on an object in an oscillating flow are validated for a cylinder. However, they are found to contain significant error when predicting the unsteady hydrodynamic forces on an oscillating hydrofoil. Contributions of this thesis link oscillating foil propulsion research to common marine engineering equations with the intent of making flapping wing propeller design more accessible to the general engineering community.
Subjects/Keywords: hydrofoil; oscillating; flapping; human-powered; propulsion; propeller
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APA (6th Edition):
Fernandez, R. (2013). Oscillating Hydrofoil Propulsion for Human-Powered Watercraft Applications. (Doctoral Dissertation). University of Canterbury. Retrieved from http://dx.doi.org/10.26021/3135
Chicago Manual of Style (16th Edition):
Fernandez, Rajan. “Oscillating Hydrofoil Propulsion for Human-Powered Watercraft Applications.” 2013. Doctoral Dissertation, University of Canterbury. Accessed January 22, 2021.
http://dx.doi.org/10.26021/3135.
MLA Handbook (7th Edition):
Fernandez, Rajan. “Oscillating Hydrofoil Propulsion for Human-Powered Watercraft Applications.” 2013. Web. 22 Jan 2021.
Vancouver:
Fernandez R. Oscillating Hydrofoil Propulsion for Human-Powered Watercraft Applications. [Internet] [Doctoral dissertation]. University of Canterbury; 2013. [cited 2021 Jan 22].
Available from: http://dx.doi.org/10.26021/3135.
Council of Science Editors:
Fernandez R. Oscillating Hydrofoil Propulsion for Human-Powered Watercraft Applications. [Doctoral Dissertation]. University of Canterbury; 2013. Available from: http://dx.doi.org/10.26021/3135
University of Sydney
12.
Zhai, Di.
Scheduling Schemes in Wireless Powered IoT Systems: Protocol Design and Performance Evaluation.
Degree: 2018, University of Sydney
URL: http://hdl.handle.net/2123/18983
► The sensor nodes in Internet-of-Things (IoT) systems are severely constrained by the amount of battery energy, which limits the network lifetime and thus the quality…
(more)
▼ The sensor nodes in Internet-of-Things (IoT) systems are severely constrained by the amount of battery energy, which limits the network lifetime and thus the quality of service. Recently, the radio frequency (RF) energy harvesting (EH) technique has been proposed as a new viable solution to prolong battery longevity in order to supply continuous and stable energy to wireless devices over the air. To this end, a new research paradigm, termed wireless-powered communication network (WPCN), was proposed and inspired many new research branches. In a WPCN, wireless devices have no embedded energy supply and only use the harvested RF energy to perform information processing/transmission. According to the current research background on WPCNs, one transmission block is divided into two time slots: EH phase and the information transmission (IT) phase. The EH node will exhaust all the energy it harvests in the EH phase to transmit data in the IT phase. This time-division (TD) based scheduling scheme may lead to sub-optimal system performance, as the amount of harvested energy is normally very limited during each scheduled slot and cannot support effective IT. In this case, the EH devices may harvest and accumulate energy for several consecutive blocks before being scheduled to perform one effective IT. Thereby, in this thesis, I consider the design of scheduling schemes and performance evaluation for wireless powered IoT systems with energy accumulation (EA). In this thesis, I first discuss the multi-user scheduling problem in a wireless powered IoT system with EA. Although multi-user scheduling has been extensively investigated in many published studies, the existing multi-user scheduling schemes are designed for conventional wireless communication networks or the aforementioned TD-based WPCN system. There are few studies of user-scheduling problems in WPCN with EA. On the other hand, to further improve the spectral efficiency, I introduce the full-duplex (FD) technique as it enables wireless devices to transmit and receive data simultaneously in the same frequency band while the receiving antenna will suffer from self-interference (SI). To this end, in this thesis, I start with a multi-user FD wireless-powered IoT system consisting of a FD hybrid access point (HAP) and multiple half-duplex (HD) IoT devices (IoDs). All IoDs are equipped with one antenna, while the HAP is equipped with two antennas. The HAP's two-antenna structure enables its FD working mode, in which one antenna is used to receive the scheduled IoD's signal in the uplink (UL) and the other is used to wirelessly charge the remaining IoDs by broadcasting RF signals in the downlink (DL). All IoDs have no embedded energy supply and thus need to perform EH before transmitting their data to the HAP. To maximize the system average throughput, I first design a new throughput-oriented scheduling scheme. Secondly, to strike a balance between the system throughput and user fairness, I then propose a fairness-oriented scheduling scheme. The system outage probability and…
Subjects/Keywords: Scheduling scheme design;
energy harvesting;
wireless powered
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APA ·
Chicago ·
MLA ·
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CSE |
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Manager
APA (6th Edition):
Zhai, D. (2018). Scheduling Schemes in Wireless Powered IoT Systems: Protocol Design and Performance Evaluation.
(Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/18983
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhai, Di. “Scheduling Schemes in Wireless Powered IoT Systems: Protocol Design and Performance Evaluation.
” 2018. Thesis, University of Sydney. Accessed January 22, 2021.
http://hdl.handle.net/2123/18983.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhai, Di. “Scheduling Schemes in Wireless Powered IoT Systems: Protocol Design and Performance Evaluation.
” 2018. Web. 22 Jan 2021.
Vancouver:
Zhai D. Scheduling Schemes in Wireless Powered IoT Systems: Protocol Design and Performance Evaluation.
[Internet] [Thesis]. University of Sydney; 2018. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/2123/18983.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhai D. Scheduling Schemes in Wireless Powered IoT Systems: Protocol Design and Performance Evaluation.
[Thesis]. University of Sydney; 2018. Available from: http://hdl.handle.net/2123/18983
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Vanderbilt University
13.
Ha, Kevin Hong youl.
Control methods for powered assistive devices for individuals with mobility impairments: compensating for disrupted physiological control loops.
Degree: PhD, Mechanical Engineering, 2015, Vanderbilt University
URL: http://hdl.handle.net/1803/11786
► Physiologic control of purposeful movement requires continuous interactions between the sensory and motor systems. When physiological control loops are disrupted, as is the case in…
(more)
▼ Physiologic control of purposeful movement requires continuous interactions between the sensory and motor systems. When physiological control loops are disrupted, as is the case in individuals with limb amputations or spinal cord injuries, purposeful movement can be difficult to achieve. With recent advances in robotic technology, assistive devices replacing some of the lost functions have begun to emerge in both research and commercial settings. This dissertation describes control approaches for such devices, with the goals of compensating for impaired physiological functions in individuals with mobility impairments while maximizing the use of retained physiological functions. Specifically, this dissertation describes the following control methods: (1) a machine learning algorithm using surface electromyography (EMG) for volitional control of
powered prosthetic devices for individuals with limb amputations, (2) a high-level step trigger controller using an inverted pendulum model for lower limb exoskeletons for gait restoration in individuals with spinal cord injuries (SCIs), and (3) a cooperative controller that combines the lower limb exoskeleton with the user’s own muscles using functional electrical stimulation (FES). Each control method was tested on multiple subjects for whom the controller was developed. The volitional control method using EMG was tested on three subjects with transfemoral amputations. The step trigger controller for lower limb exoskeletons was tested on five subjects with motor-complete spinal cord injuries. The cooperative controller combining FES with
powered lower limb exoskeletons was tested on three subjects with motor-complete spinal cord injuries who were FES-responsive. In all cases, results indicate that the proposed control methods are able to provide functional benefits to individuals with mobility impairments.
Advisors/Committee Members: Eric J. Barth, PhD (committee member), Robert J. Webster, PhD (committee member), Peter E. Konrad, MD, PhD (committee member), Michael Goldfarb, PhD (Committee Chair).
Subjects/Keywords: FES; powered exoskeleton; cooperative controller; spinal cord injury; SCI; powered prosthesis; functional electrical stimulation; EMG; electromyography
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ha, K. H. y. (2015). Control methods for powered assistive devices for individuals with mobility impairments: compensating for disrupted physiological control loops. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11786
Chicago Manual of Style (16th Edition):
Ha, Kevin Hong youl. “Control methods for powered assistive devices for individuals with mobility impairments: compensating for disrupted physiological control loops.” 2015. Doctoral Dissertation, Vanderbilt University. Accessed January 22, 2021.
http://hdl.handle.net/1803/11786.
MLA Handbook (7th Edition):
Ha, Kevin Hong youl. “Control methods for powered assistive devices for individuals with mobility impairments: compensating for disrupted physiological control loops.” 2015. Web. 22 Jan 2021.
Vancouver:
Ha KHy. Control methods for powered assistive devices for individuals with mobility impairments: compensating for disrupted physiological control loops. [Internet] [Doctoral dissertation]. Vanderbilt University; 2015. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1803/11786.
Council of Science Editors:
Ha KHy. Control methods for powered assistive devices for individuals with mobility impairments: compensating for disrupted physiological control loops. [Doctoral Dissertation]. Vanderbilt University; 2015. Available from: http://hdl.handle.net/1803/11786
University of California – Irvine
14.
Jiang, Yuyuan.
Energy, Cost, and Carbon Footprint Analysis of a Solar-Powered Mixer in a Facultative Lagoon for Wastewater Treatment.
Degree: Engineering, 2015, University of California – Irvine
URL: http://www.escholarship.org/uc/item/6wh7p7qg
► Lagoon treatment is common in small communities and/or rural areas where land is available. Mixing is the energy driver for this kind of treatment. Mixing…
(more)
▼ Lagoon treatment is common in small communities and/or rural areas where land is available. Mixing is the energy driver for this kind of treatment. Mixing could re-suspend the settled solids and oxidize matters at the surface in contact with atmosphere air. Traditionally, the mixer for lagoon treatment is mechanical mixer that gets power from grid. Recently, with the decreasing price of photovoltaic batteries, the solar powered mixers are posed to replace the traditional grid-powered mechanical mixers. As the aeration process is the most energy intensive process, transitioning the mixers off-grid means that the energy demand will be sharply reduced, which in turn reduces the process energy importation. In this research we studied the comparative scenarios of an existing grid-powered mechanical mixer and a solar-powered mixer. Testing campaign was conducted to monitor the water quality, energy consumption and carbon emission changes to evaluate the feasibility to use off-grid solar-powered mixer in lagoon treatment. In each test, water quality was tested in field to guarantee the performance of the solar-powered mixer. The energy usage was recorded with the electrical energy monitor by the wastewater treatment utility. The result shows that after the replacement, both energy usage and cost have a significant reduction, the energy usage having decreased by 70% and the cost by 47%. Additionally, carbon-equivalent emission from electricity importation dropped by 64%, with an effect on the overall carbon emissions (i.e., including all other contributions from the process) decreasing from 3.5% to 1.3%. The studied solar-powered mixer is adequate to replace the existing mechanical mixer and is an energy and carbon-emission conservation alternative.
Subjects/Keywords: Environmental engineering; Carbon Footprint; Energy; Facultative Lagoon; Solar-powered Mixer
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APA ·
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Export
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APA (6th Edition):
Jiang, Y. (2015). Energy, Cost, and Carbon Footprint Analysis of a Solar-Powered Mixer in a Facultative Lagoon for Wastewater Treatment. (Thesis). University of California – Irvine. Retrieved from http://www.escholarship.org/uc/item/6wh7p7qg
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jiang, Yuyuan. “Energy, Cost, and Carbon Footprint Analysis of a Solar-Powered Mixer in a Facultative Lagoon for Wastewater Treatment.” 2015. Thesis, University of California – Irvine. Accessed January 22, 2021.
http://www.escholarship.org/uc/item/6wh7p7qg.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jiang, Yuyuan. “Energy, Cost, and Carbon Footprint Analysis of a Solar-Powered Mixer in a Facultative Lagoon for Wastewater Treatment.” 2015. Web. 22 Jan 2021.
Vancouver:
Jiang Y. Energy, Cost, and Carbon Footprint Analysis of a Solar-Powered Mixer in a Facultative Lagoon for Wastewater Treatment. [Internet] [Thesis]. University of California – Irvine; 2015. [cited 2021 Jan 22].
Available from: http://www.escholarship.org/uc/item/6wh7p7qg.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jiang Y. Energy, Cost, and Carbon Footprint Analysis of a Solar-Powered Mixer in a Facultative Lagoon for Wastewater Treatment. [Thesis]. University of California – Irvine; 2015. Available from: http://www.escholarship.org/uc/item/6wh7p7qg
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rochester Institute of Technology
15.
Harrington, Jesse.
Creating current.
Degree: School of Design (CIAS), 2011, Rochester Institute of Technology
URL: https://scholarworks.rit.edu/theses/6288
► What if we could bring education to the masses explaining how to develop a particular product without having to mass produce the actual product? The…
(more)
▼ What if we could bring education to the masses explaining how to develop a particular product without having to mass produce the actual product? The pursuit of creating knowledge economies using power on demand as an idea worth spreading is how I have attempted to answer this question. Through identifying three styles of active learning, I designed three idea spreading mechanisms. Kinesthetic, Accommodative and Tactillian learners are all active learners, they want physical involvement with their education. These three concepts; a bicycle generator museum exhibit (accommodative), a traveling bicycle generator exhibit (kinesthetic) and a set of DIY/DIT (Do it together) bicycle generator plans (tactillian) help facilitate this process in order to gain a wide user audience, making the spreading of ideas more successful. All three are designed to give the user the building blocks for further exploration.
Chosen for its world wide relevance, power on demand (POD) is the notion of utilizing human power in order to gain mechanical power, be it electric or non-electric. Bicycles are one such means to produce mechanical or electrical energy, located throughout the world and easy to manipulate. This simplicity is essential to help facilitate future interest in creating ones own means of energy.
The end result is three learning mechanisms that utilize pedal power and can be spread to a mass audience without being individually purchased. The first is currently on display at the Rochester
Museum and Science Center and is a stationary bicycle generator hooked up to multiple kinds of light bulbs to teach users how much wattage they need to pedal out in order to power a florescent bulb versus an LED. The second is a traveling bicycle generator tailored for classroom style group learning, it can be hooked up to multiple household items and is able to run a series of experiments . The third is a set of DIY/DIT plans that are completely graphical and can be used by anyone in the world regardless of language as the user teaches other users or creates more refined models. The learning mechanisms show users physically how much energy the objects around them consume as well as showing how to create your own source of energy.
Advisors/Committee Members: Rickel, Stan.
Subjects/Keywords: Bicycle; DIY education; Human powered; Kosovo; Learning communities; Pedal power
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APA (6th Edition):
Harrington, J. (2011). Creating current. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/6288
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Harrington, Jesse. “Creating current.” 2011. Thesis, Rochester Institute of Technology. Accessed January 22, 2021.
https://scholarworks.rit.edu/theses/6288.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Harrington, Jesse. “Creating current.” 2011. Web. 22 Jan 2021.
Vancouver:
Harrington J. Creating current. [Internet] [Thesis]. Rochester Institute of Technology; 2011. [cited 2021 Jan 22].
Available from: https://scholarworks.rit.edu/theses/6288.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Harrington J. Creating current. [Thesis]. Rochester Institute of Technology; 2011. Available from: https://scholarworks.rit.edu/theses/6288
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rochester Institute of Technology
16.
Chambers, John.
Longitudinal dynamic modeling and control of powered parachute aircraft.
Degree: 2007, Rochester Institute of Technology
URL: https://scholarworks.rit.edu/theses/4262
► Powered parachutes (PPC) represent a very unique class of aircraft which have thus far seen limited use beyond recreational flight. Their slow flight and large…
(more)
▼ Powered parachutes (PPC) represent a very unique class of aircraft which have thus far seen limited use beyond recreational flight. Their slow flight and large payload characteristics make them a practical platform for applications such as aerial spraying and surveillance. The portability of the units when not airborne, fast transition to flight readiness, inherent stability, and simplicity of control enhance their appeal for use as Unmanned Aerial Vehicles (UAV). The aircraft fly using only three control inputs consisting of two steering lines and a throttle for control of climb and descent. One of the more interesting characteristics that distinguish PPC from conventional aircraft is the pendulum stability which is a consequence of suspending the majority of the aircraft weight so far from the wing surface and which introduces an appreciable amount of lag into the system. Another interesting phenomenon is their speed stability which causes the aircraft to fly at a relatively constant speed whether it is climbing, descending, or flying straight-and-level. The current study seeks to examine the effects of throttle on the longitudinal dynamics of PPC, using a small-scale aircraft. A dynamic model has been derived using analytical methods and computer-simulated in MATLAB and Simulink, developed by The Mathworks. The validity of the model was then verified using data recorded from the small-scale PPC. Effects of parameters such as aircraft weight and thrust were examined and related to flight characteristics such as airspeed and climb rate. Finally, a control system was developed to deal with the aforementioned lag and demonstrate accurate altitude-hold capability for a
powered parachute.
Advisors/Committee Members: Kochersberger, Kevin - Chair.
Subjects/Keywords: Dynamic; Longitudinal; Modeling; Powered parachute
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APA ·
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Manager
APA (6th Edition):
Chambers, J. (2007). Longitudinal dynamic modeling and control of powered parachute aircraft. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/4262
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chambers, John. “Longitudinal dynamic modeling and control of powered parachute aircraft.” 2007. Thesis, Rochester Institute of Technology. Accessed January 22, 2021.
https://scholarworks.rit.edu/theses/4262.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chambers, John. “Longitudinal dynamic modeling and control of powered parachute aircraft.” 2007. Web. 22 Jan 2021.
Vancouver:
Chambers J. Longitudinal dynamic modeling and control of powered parachute aircraft. [Internet] [Thesis]. Rochester Institute of Technology; 2007. [cited 2021 Jan 22].
Available from: https://scholarworks.rit.edu/theses/4262.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chambers J. Longitudinal dynamic modeling and control of powered parachute aircraft. [Thesis]. Rochester Institute of Technology; 2007. Available from: https://scholarworks.rit.edu/theses/4262
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Dalhousie University
17.
Blackman, Clayton.
Design with Nature: Learning from Ecological Systems to
Educate the Urban Dweller.
Degree: M. Arch., School of Architecture, 2013, Dalhousie University
URL: http://hdl.handle.net/10222/21663
► Nature has an effective approach to cycling materials and energy flows to promote life. This thesis aims to expose urbanite users to natures way of…
(more)
▼ Nature has an effective approach to cycling materials
and energy flows to promote life. This thesis aims to expose
urbanite users to natures way of cycling materials. The seawall is
the largest public space in Vancouver at the edge of land and sea.
A neighbourhood community centre along the edge called the
Conservatory for Community Matters is created to nurture
environmental stewardship by mimicking natural cycles in its
function. By conveying architectural systems and form in a cyclical
and organic approach, an architectural intervention can address the
daily environmental impact of urbanites while rooting people in
place and nature in the city. The community centres program
connects the individually focused daily rituals of eating, making,
and exercising to benefit the larger community where urbanites can
reintegrate their organic wastes into usable by-products. This
promotes a paradigm shift transforming the apathetic consumer into
an active member of the urban ecosystem.
Advisors/Committee Members: Geoffrey Thun (external-examiner), Stephen Parcell (graduate-coordinator), Richard Kroeker (thesis-reader), Roland Hudson (thesis-supervisor), Not Applicable (ethics-approval), Not Applicable (manuscripts), Not Applicable (copyright-release).
Subjects/Keywords: architecture; ecological design; community; ritual; human powered; ecosystem; edge; Vancouver
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APA (6th Edition):
Blackman, C. (2013). Design with Nature: Learning from Ecological Systems to
Educate the Urban Dweller. (Masters Thesis). Dalhousie University. Retrieved from http://hdl.handle.net/10222/21663
Chicago Manual of Style (16th Edition):
Blackman, Clayton. “Design with Nature: Learning from Ecological Systems to
Educate the Urban Dweller.” 2013. Masters Thesis, Dalhousie University. Accessed January 22, 2021.
http://hdl.handle.net/10222/21663.
MLA Handbook (7th Edition):
Blackman, Clayton. “Design with Nature: Learning from Ecological Systems to
Educate the Urban Dweller.” 2013. Web. 22 Jan 2021.
Vancouver:
Blackman C. Design with Nature: Learning from Ecological Systems to
Educate the Urban Dweller. [Internet] [Masters thesis]. Dalhousie University; 2013. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10222/21663.
Council of Science Editors:
Blackman C. Design with Nature: Learning from Ecological Systems to
Educate the Urban Dweller. [Masters Thesis]. Dalhousie University; 2013. Available from: http://hdl.handle.net/10222/21663
Purdue University
18.
Williams, Joseph.
Trajectory optimization using indirect methods and parametric scramjet cycle analysis.
Degree: MSin Aeronautics and Astronautics, Aeronautics and Astronautics, 2016, Purdue University
URL: https://docs.lib.purdue.edu/open_access_theses/908
► This study investigates the solution of time sensitive regional strike trajectories for hypersonic missiles. This minimum time trajectory is suspected to be best performed…
(more)
▼ This study investigates the solution of time sensitive regional strike trajectories for hypersonic missiles. This minimum time trajectory is suspected to be best performed by scramjet
powered hypersonic missiles which creates strong coupled interaction between the flight dynamics and the performance of the engine. Comprehensive engine models are necessary to gain better insight into scramjet propulsion. Separately, robust and comprehensive trajectory analysis provides references for vehicles to fly along. However, additional observation and understanding is obtained by integrating the propulsion model inside the trajectory framework. Going beyond curve fitted thrusting models, an integrated scramjet cycle analysis offers rapid trade studies on engine parameters and enables the identification of the most significant and optimal engine parameters for the mission as a whole. Regularization of bang-bang control problems by use of the Epsilon-Trig regularization method has created the possibility to preserve the original equations of motion while still solving these problems through indirect methods. Indirect methods incorporate mathematical information from the optimal control problem to provide high quality, integrated solutions. The minimum time optimal trajectory of a rocket propelled missile is compared to that of a scramjet
powered missile to determine the advantages of scramjet technology in this application.
Advisors/Committee Members: Michael J. Grant, Michael J. Grant, William Crossley, Stephen Heister.
Subjects/Keywords: Applied sciences; Indirect; Optimization; Powered; Regularization; Scramjet; Trajectory; Aerospace Engineering
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APA (6th Edition):
Williams, J. (2016). Trajectory optimization using indirect methods and parametric scramjet cycle analysis. (Thesis). Purdue University. Retrieved from https://docs.lib.purdue.edu/open_access_theses/908
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Williams, Joseph. “Trajectory optimization using indirect methods and parametric scramjet cycle analysis.” 2016. Thesis, Purdue University. Accessed January 22, 2021.
https://docs.lib.purdue.edu/open_access_theses/908.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Williams, Joseph. “Trajectory optimization using indirect methods and parametric scramjet cycle analysis.” 2016. Web. 22 Jan 2021.
Vancouver:
Williams J. Trajectory optimization using indirect methods and parametric scramjet cycle analysis. [Internet] [Thesis]. Purdue University; 2016. [cited 2021 Jan 22].
Available from: https://docs.lib.purdue.edu/open_access_theses/908.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Williams J. Trajectory optimization using indirect methods and parametric scramjet cycle analysis. [Thesis]. Purdue University; 2016. Available from: https://docs.lib.purdue.edu/open_access_theses/908
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cornell University
19.
Bryant, Matthew.
Aeroelastic Flutter Vibration Energy Harvesting: Modeling, Testing, And System Design.
Degree: PhD, Mechanical Engineering, 2012, Cornell University
URL: http://hdl.handle.net/1813/31459
► The rapid proliferation of wireless sensors and microelectronics has spurred considerable interest in developing small scale devices that convert ambient energy sources to electrical power.…
(more)
▼ The rapid proliferation of wireless sensors and microelectronics has spurred considerable interest in developing small scale devices that convert ambient energy sources to electrical power. Such "energy harvesting" devices could thus eliminate the need for hardwired power and extend the useful lifespan of a wireless sensor beyond the finite capacity of a battery. Piezoelectric materials, which directly convert mechanical strain to electrical energy, have been extensively investigated in recent years as a potential means to harvest energy from mechanical vibrations. This research has predominately focused on harvesting energy from preexisting vibrating host structures through base excitation of cantilevered piezoelectric beams. This approach, while simple to implement, inherently restricts the application of piezoelectric energy harvesting technology to environments where suitable vibrations are available. This dissertations proposes and investigates a novel piezoelectric energy harvesting device that simultaneously generates vibrations and harvests energy from an ambient fluid flow by inducing an aeroelastic flutter instability in a simple structure. The proposed device is studied through a combination of analytic modeling and wind tunnel experimentation. A model of this device that captures the three-way coupling between the structural, unsteady aerodynamic, and electrical aspects of the system is developed. The model is applied to predict the flow speed required for energy harvesting using linear stability analysis, and is generalized to account for aerodynamic nonlinearities that lead to flutter limit cycle behavior over a broad range of flow speeds. Wind tunnel test results are presented to determine empirical aerodynamic model coefficients and to characterize the power output and flutter frequency of the harvester as functions of incident wind speed. The model is then used to investigate the key design parameters of the system and determine the sensitivity and effective range of each parameter in affecting the characteristics of the aeroelastic instability driving the energy harvester. Finally, wind tunnel testing and flow visualization investigate the aerodynamic interactions between multiple flutter energy harvesters operating simultaneously. These experiments reveal synergistic wake-structure interactions than can be used to enhance the array performance, allowing the harvesters to produce more power when operating in close proximity than in a steady free stream flow.
Advisors/Committee Members: Garcia, Ephrahim (chair), Lipson, Hod (committee member), Lal, Amit (committee member).
Subjects/Keywords: Energy Harvesting; Piezoelectric; Aeroelasticity; Flutter; Flapping; Wind Power; Self Powered
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APA (6th Edition):
Bryant, M. (2012). Aeroelastic Flutter Vibration Energy Harvesting: Modeling, Testing, And System Design. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/31459
Chicago Manual of Style (16th Edition):
Bryant, Matthew. “Aeroelastic Flutter Vibration Energy Harvesting: Modeling, Testing, And System Design.” 2012. Doctoral Dissertation, Cornell University. Accessed January 22, 2021.
http://hdl.handle.net/1813/31459.
MLA Handbook (7th Edition):
Bryant, Matthew. “Aeroelastic Flutter Vibration Energy Harvesting: Modeling, Testing, And System Design.” 2012. Web. 22 Jan 2021.
Vancouver:
Bryant M. Aeroelastic Flutter Vibration Energy Harvesting: Modeling, Testing, And System Design. [Internet] [Doctoral dissertation]. Cornell University; 2012. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1813/31459.
Council of Science Editors:
Bryant M. Aeroelastic Flutter Vibration Energy Harvesting: Modeling, Testing, And System Design. [Doctoral Dissertation]. Cornell University; 2012. Available from: http://hdl.handle.net/1813/31459
Vanderbilt University
20.
Farris, Ryan James.
Design of a Powered Lower-Limb Exoskeleton and Control for Gait Assistance in Paraplegics.
Degree: PhD, Mechanical Engineering, 2012, Vanderbilt University
URL: http://hdl.handle.net/1803/10607
► This work describes the design and implementation of a powered lower limb exoskeleton for providing legged mobility to the spinal cord injury (SCI) population. The…
(more)
▼ This work describes the design and implementation of a
powered lower limb exoskeleton for providing legged mobility to the spinal cord injury (SCI) population. The exoskeleton has a mass of 12.5 kg and provides sagital plane joint torques of up to 65 Nm at the hips and knees to enable walking, sit-to-stand transitions, stand-to-sit transitions, stair ascent, and stair descent. A custom distributed embedded system controls the exoskeleton with power being provided by a lithium polymer battery. The control structure provides an intuitive interface between the user and the exoskeleton for ease of use with a minimal learning curve. In order to demonstrate the ability of the exoskeleton to assist walking and stair ascent/descent, the exoskeleton was experimentally implemented on a paraplegic
subject with a T10 complete injury. Data collected during walking indicates a high degree of step-to-step repeatability of hip and knee trajectories (as enforced by the exoskeleton). Experimental data is presented characterizing the joint torque and power required to provide stair ascent and descent functionality to a person with paraplegia. Also described is a functional assessment protocol for assessing the mobility and exertion associated with systems that provide legged mobility assistance for persons with SCI.
Advisors/Committee Members: Robert J. Webster III (committee member), Eric Barth (committee member), Nilanjan Sarkar (committee member), Peter Konrad (committee member), Chris Byrne (committee member), Michael Goldfarb (Committee Chair).
Subjects/Keywords: rehabilitation robotics; paraplegia; powered orthosis; SCI; Lower limb exoskeleton; assitive technology
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APA (6th Edition):
Farris, R. J. (2012). Design of a Powered Lower-Limb Exoskeleton and Control for Gait Assistance in Paraplegics. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/10607
Chicago Manual of Style (16th Edition):
Farris, Ryan James. “Design of a Powered Lower-Limb Exoskeleton and Control for Gait Assistance in Paraplegics.” 2012. Doctoral Dissertation, Vanderbilt University. Accessed January 22, 2021.
http://hdl.handle.net/1803/10607.
MLA Handbook (7th Edition):
Farris, Ryan James. “Design of a Powered Lower-Limb Exoskeleton and Control for Gait Assistance in Paraplegics.” 2012. Web. 22 Jan 2021.
Vancouver:
Farris RJ. Design of a Powered Lower-Limb Exoskeleton and Control for Gait Assistance in Paraplegics. [Internet] [Doctoral dissertation]. Vanderbilt University; 2012. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1803/10607.
Council of Science Editors:
Farris RJ. Design of a Powered Lower-Limb Exoskeleton and Control for Gait Assistance in Paraplegics. [Doctoral Dissertation]. Vanderbilt University; 2012. Available from: http://hdl.handle.net/1803/10607
Vanderbilt University
21.
Lawson, Brian Edward.
Control Methodologies for Powered Prosthetic Interventions in Unilateral and Bilateral Transfemoral Amputees.
Degree: PhD, Mechanical Engineering, 2014, Vanderbilt University
URL: http://hdl.handle.net/1803/12271
► This dissertation describes the development and testing of control systems for powered transfemoral prostheses. The work is divided into seven chapters, with five distinct contributions.…
(more)
▼ This dissertation describes the development and testing of control systems for
powered transfemoral prostheses. The work is divided into seven chapters, with five distinct contributions. Chapter I provides introductory material, background, and some of the theoretical motivations behind the work. In Chapter II, a finite state-based locally passive impedance controller is described based on previous work and extended to achieve active stumble recovery mechanisms in level walking. In Chapter III, new state machines are introduced and implemented in order to perform stair ascent and descent in unilateral transfemoral amputees. In Chapter IV, a hybrid control approach is presented that simplifies the state machine and achieves continuously variable cadences. In Chapter V, a coordinated control scheme is presented for bilateral transfemoral amputees. Chapter VI describes and tests an algorithm that estimates the crank angle of a bicycle using measurements internal to the prosthesis. Chapter VII draws some conclusions about the work and discusses future directions.
Advisors/Committee Members: Nilanjan Sarkar (committee member), Eric J. Barth (committee member), Robert J. Webster III (committee member), George E. Cook (committee member), Michael Goldfarb (Committee Chair).
Subjects/Keywords: Transfemoral; Robotics; Powered Prosthesis; Mechatronics; Amputation; Rehabilitation Robotics
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APA (6th Edition):
Lawson, B. E. (2014). Control Methodologies for Powered Prosthetic Interventions in Unilateral and Bilateral Transfemoral Amputees. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/12271
Chicago Manual of Style (16th Edition):
Lawson, Brian Edward. “Control Methodologies for Powered Prosthetic Interventions in Unilateral and Bilateral Transfemoral Amputees.” 2014. Doctoral Dissertation, Vanderbilt University. Accessed January 22, 2021.
http://hdl.handle.net/1803/12271.
MLA Handbook (7th Edition):
Lawson, Brian Edward. “Control Methodologies for Powered Prosthetic Interventions in Unilateral and Bilateral Transfemoral Amputees.” 2014. Web. 22 Jan 2021.
Vancouver:
Lawson BE. Control Methodologies for Powered Prosthetic Interventions in Unilateral and Bilateral Transfemoral Amputees. [Internet] [Doctoral dissertation]. Vanderbilt University; 2014. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1803/12271.
Council of Science Editors:
Lawson BE. Control Methodologies for Powered Prosthetic Interventions in Unilateral and Bilateral Transfemoral Amputees. [Doctoral Dissertation]. Vanderbilt University; 2014. Available from: http://hdl.handle.net/1803/12271
22.
Khan, Bilal Mustafa.
Service quality systems for high powered corporate
performance a critical study of selected service
industries;.
Degree: Bussiness Administration, 2003, Aligarh Muslim University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/53662
Abstract available newline newline
Bibliography p. 381-406, Appendix p.
407-418
Advisors/Committee Members: Ozair, S M.Subjects/Keywords: Powered; Systems; Corporat; Industries
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APA (6th Edition):
Khan, B. M. (2003). Service quality systems for high powered corporate
performance a critical study of selected service
industries;. (Thesis). Aligarh Muslim University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/53662
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Khan, Bilal Mustafa. “Service quality systems for high powered corporate
performance a critical study of selected service
industries;.” 2003. Thesis, Aligarh Muslim University. Accessed January 22, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/53662.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Khan, Bilal Mustafa. “Service quality systems for high powered corporate
performance a critical study of selected service
industries;.” 2003. Web. 22 Jan 2021.
Vancouver:
Khan BM. Service quality systems for high powered corporate
performance a critical study of selected service
industries;. [Internet] [Thesis]. Aligarh Muslim University; 2003. [cited 2021 Jan 22].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/53662.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Khan BM. Service quality systems for high powered corporate
performance a critical study of selected service
industries;. [Thesis]. Aligarh Muslim University; 2003. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/53662
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
23.
De Wet, Pierre.
Powered addition as modelling technique for flow processes.
Degree: Mathematical Sciences, 2010, Stellenbosch University
URL: http://hdl.handle.net/10019.1/4166
► Thesis (MSc (Applied Mathematics)) – University of Stellenbosch, 2010.
ENGLISH ABSTRACT: The interpretation – and compilation of predictive equations to represent the general trend – of…
(more)
▼ Thesis (MSc (Applied Mathematics)) – University of Stellenbosch, 2010.
ENGLISH ABSTRACT: The interpretation – and compilation of predictive equations to represent the general
trend – of collected data is aided immensely by its graphical representation. Whilst,
by and large, predictive equations are more accurate and convenient for use in applications
than graphs, the latter is often preferable since it visually illustrates deviations
in the data, thereby giving an indication of reliability and the range of validity of the
equation. Combination of these two tools – a graph for demonstration and an equation
for use – is desirable to ensure optimal understanding. Often, however, the functional
dependencies of the dependent variable are only known for large and small values
of the independent variable; solutions for intermediate quantities being obscure for
various reasons (e.g. narrow band within which the transition from one regime to
the other occurs, inadequate knowledge of the physics in this area, etc.). The limiting
solutions may be regarded as asymptotic and the powered addition to a power,
s, of such asymptotes, f0 and f¥ , leads to a single correlating equation that is applicable
over the entire domain of the dependent variable. This procedure circumvents
the introduction of ad hoc curve fitting measures for the different regions and subsequent,
unwanted jumps in piecewise fitted correlative equations for the dependent
variable(s). Approaches to successfully implement the technique for different combinations
of asymptotic conditions are discussed. The aforementioned method of powered
addition is applied to experimental data and the semblances and discrepancies
with literature and analytical models are discussed; the underlying motivation being
the aspiration towards establishing a sound modelling framework for analytical and
computational predictive measures. The purported procedure is revealed to be highly
useful in the summarising and interpretation of experimental data in an elegant and
simplistic manner.
AFRIKAANSE OPSOMMING: Die interpretasie – en samestelling van vergelykings om die algemene tendens voor te
stel – van versamelde data word onoorsienbaar bygestaan deur die grafiese voorstelling
daarvan. Ten spyte daarvan dat vergelykings meer akkuraat en geskik is vir
die gebruik in toepassings as grafieke, is laasgenoemde dikwels verskieslik aangesien
dit afwykings in die data visueel illustreer en sodoende ’n aanduiding van die betroubaarheid
en omvang van geldigheid van die vergelyking bied. ’n Kombinasie van
hierdie twee instrumente – ’n grafiek vir demonstrasie en ’n vergelyking vir aanwending
– is wenslik om optimale begrip te verseker. Die funksionele afhanklikheid van
die afhanklike veranderlike is egter dikwels slegs bekend vir groot en klein waardes
van die onafhanklike veranderlike; die oplossings by intermediêre hoeveelhede onduidelik
as gevolg van verskeie redes (waaronder, bv. ’n smal band van waardes
waarbinne die oorgang tussen prosesse plaasvind,…
Advisors/Committee Members: Du Plessis, J. P., University of Stellenbosch. Faculty of Science. Dept. of Mathematical Sciences. Applied Mathematics..
Subjects/Keywords: Applied mathematics; Powered addition; Fluidization
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APA (6th Edition):
De Wet, P. (2010). Powered addition as modelling technique for flow processes. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/4166
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
De Wet, Pierre. “Powered addition as modelling technique for flow processes.” 2010. Thesis, Stellenbosch University. Accessed January 22, 2021.
http://hdl.handle.net/10019.1/4166.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
De Wet, Pierre. “Powered addition as modelling technique for flow processes.” 2010. Web. 22 Jan 2021.
Vancouver:
De Wet P. Powered addition as modelling technique for flow processes. [Internet] [Thesis]. Stellenbosch University; 2010. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10019.1/4166.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
De Wet P. Powered addition as modelling technique for flow processes. [Thesis]. Stellenbosch University; 2010. Available from: http://hdl.handle.net/10019.1/4166
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
24.
Kanaan, Basel Hamdi.
Observing the In-Situ Behaviour of Series and Parallel VAV-Fan Powered Terminal Units.
Degree: MS, Construction Management, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/158652
► This study investigated multiple aspects related to how fan powered terminal units (FPTU), as used in variable air volume systems, behave under as-built conditions. Whether…
(more)
▼ This study investigated multiple aspects related to how fan
powered terminal units (FPTU), as used in variable air volume systems, behave under as-built conditions. Whether this behavior conforms to accepted industry norms and expectations and how existing energy simulation tools react to a variety of input extremes based on program “defaults” and “rules of thumb”.
The efforts by the Air-Conditioning, Heating and Refrigeration Institute to update existing energy models of FPTU’s raised the issue of quantifying the static pressure rise observed across FPTU’s. This study has corroborated existing laboratory results with in-situ “field” measurements ranging between 0.2 in. w.g. (50 Pa) to 0.27 in. w.g. (67.2 Pa).
The in-situ measurements were expanded to include qualitative analyses of series and parallel FPTU leakage. The study demonstrated – through observing temperature differences between the surround plenum and fan
powered terminal unit induction port – that there is no significant evidence of series FPTU leakage, while a single parallel FPTU was observed to have leaked. Coupling that data set with infrared (IR) images captured of pressurized parallel fan
powered terminal units (usually considered normal operating conditions for parallel FPTU’s) showing evidence of leakage along the FPTU “seams”, induction port and interface connections.
The in-situ measurement also determined that “field” FPTU’s operate under lower downstream static pressure conditions than those set by AHRI/ANSI 880. Ranging from 0.0417 in. w.g. (10.4 Pa) to 0.1014 in. w.g. (25.2 Pa).
Previous research efforts independently quantified the two major inputs EnergyPlus requires to simulate fan
powered terminal units (static pressure rise across the FPTU and motor efficiency). This study was expanded and aimed to determine which combination of the two inputs – either within the quantified parameters or a combination of more extreme cases – contributed to observable differences in energy consumption. The study concluded that the overall energy consumed by the simulated system does not change significantly, an observed difference of 2.3% annually between the greater extremes.
Advisors/Committee Members: Bryant, John A (advisor), Pate, Michael (committee member), Dixit, Manish (committee member).
Subjects/Keywords: Energy Simulation; Fan Powered Terminal Units; Variable Air Volume
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Export
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APA (6th Edition):
Kanaan, B. H. (2016). Observing the In-Situ Behaviour of Series and Parallel VAV-Fan Powered Terminal Units. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/158652
Chicago Manual of Style (16th Edition):
Kanaan, Basel Hamdi. “Observing the In-Situ Behaviour of Series and Parallel VAV-Fan Powered Terminal Units.” 2016. Masters Thesis, Texas A&M University. Accessed January 22, 2021.
http://hdl.handle.net/1969.1/158652.
MLA Handbook (7th Edition):
Kanaan, Basel Hamdi. “Observing the In-Situ Behaviour of Series and Parallel VAV-Fan Powered Terminal Units.” 2016. Web. 22 Jan 2021.
Vancouver:
Kanaan BH. Observing the In-Situ Behaviour of Series and Parallel VAV-Fan Powered Terminal Units. [Internet] [Masters thesis]. Texas A&M University; 2016. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/1969.1/158652.
Council of Science Editors:
Kanaan BH. Observing the In-Situ Behaviour of Series and Parallel VAV-Fan Powered Terminal Units. [Masters Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/158652
Penn State University
25.
Thomson, Brian Francis.
Estimation and Reduction of Temporal Magnetic Field Fluctuations in Powered Magnets using Inductive and NMR Feedback Control.
Degree: 2013, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/19934
► Powered magnets provide high magnetic fields that promise to significantly improve nuclear magnetic resonance spectroscopy (NMR). Higher fields increase NMR chemical shift resolution and signal-to-noise…
(more)
▼ Powered magnets provide high magnetic fields that promise to significantly improve nuclear magnetic resonance spectroscopy (NMR). Higher fields increase NMR chemical shift resolution and signal-to-noise ratio (SNR) while decreasing quadrupolar line broadening in solids. High resolution NMR is typically performed using superconducting magnets, which are currently limited to 24 Tesla.
Powered magnets can provide continuous fields up to 45 Tesla, significantly larger than that achievable by superconducting magnets. This will dramatically expand opportunities in the areas of material science, chemistry, and biology. However, temporal magnetic field fluctuations due to both the power supply and cooling water system currently render these magnets unsuitable for high resolution NMR.
The focus of this dissertation is to design, synthesize, and verify a feedback control system that reduces temporal field fluctuations so that
powered magnets can be used for high resolution NMR. Earlier studies have shown that feedback control using inductive measurements significantly reduces higher frequency field fluctuations associated with power supply ripple, but are limited in
their ability to reduce lower frequency field fluctuations associated with variations in the cooling water system. Conversely, feedback control using NMR measurements are more conducive to reducing lower frequency field fluctuations and less successful at higher frequencies. Feedback control systems which use NMR measurements are often referred to as field-frequency locks (FFLs). Earlier studies have shown that FFLs can estimate and reduce lower frequency field fluctuations in superconducting magnets, but have limited ability to do the same in
powered magnets. This dissertation investigates why such FFLs are limited in
powered magnets, and
demonstrates some alternative methods for estimating lower frequency field fluctuations using NMR measurements in
powered magnets. A digital sampled-data feedback control design using field fluctuation estimates from NMR measurements is combined with feedback control using inductive measurements, forming a cascade feedback control design that reduces both lower and higher frequency field fluctuations. This approach is experimentally verified in a
powered magnet operating at 25 Tesla.
Advisors/Committee Members: Jeffrey Louis Schiano, Dissertation Advisor/Co-Advisor, Jeffrey Louis Schiano, Committee Chair/Co-Chair, Constantino Manuel Lagoa, Committee Member, William Kenneth Jenkins, Committee Member, Patrick M Lenahan, Committee Member.
Subjects/Keywords: Feedback Control; Powered Magnets; Temporal Magnetic Field Fluct
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Manager
APA (6th Edition):
Thomson, B. F. (2013). Estimation and Reduction of Temporal Magnetic Field Fluctuations in Powered Magnets using Inductive and NMR Feedback Control. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/19934
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Thomson, Brian Francis. “Estimation and Reduction of Temporal Magnetic Field Fluctuations in Powered Magnets using Inductive and NMR Feedback Control.” 2013. Thesis, Penn State University. Accessed January 22, 2021.
https://submit-etda.libraries.psu.edu/catalog/19934.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Thomson, Brian Francis. “Estimation and Reduction of Temporal Magnetic Field Fluctuations in Powered Magnets using Inductive and NMR Feedback Control.” 2013. Web. 22 Jan 2021.
Vancouver:
Thomson BF. Estimation and Reduction of Temporal Magnetic Field Fluctuations in Powered Magnets using Inductive and NMR Feedback Control. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Jan 22].
Available from: https://submit-etda.libraries.psu.edu/catalog/19934.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Thomson BF. Estimation and Reduction of Temporal Magnetic Field Fluctuations in Powered Magnets using Inductive and NMR Feedback Control. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/19934
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
26.
Ortiz, Isamar.
Enzyme-Powered Pumps: From Fundamentals to Applications.
Degree: 2017, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/13844iuo103
► Non-mechanical nano and microfluidic devices that function without the aid of an external power source, and can be tailored to meet specific needs, represent the…
(more)
▼ Non-mechanical nano and microfluidic devices that function without the aid of an external power source, and can be tailored to meet specific needs, represent the next generation of smart devices. Recently, we have shown that surface-bound enzymes can act as pumps driving large-scale fluid flows in the presence of any substance that triggers the enzymatic reaction (e.g. substrate, co-factor, or biomarker). The fluid velocities attained in such systems depend directly on the enzymatic reaction rate and the concentration of the substance that initiates enzymatic catalysis. The use of biochemical reactions to power a micropump offers the advantages of specificity, sensitivity, and selectively, eliminating at the same time the need of an external power source, while providing biocompatibility. More importantly, these self-
powered pumps overcome a significant obstacle in nano- and micro-fluidics: the need to use external pressure-driven pumps to push fluids through devices.
Certainly, the development of enzyme-
powered devices opens up new venues in biochemical engineering, particularly in the biomedical field. However, in order to take this concept to the next level, and design more precise, complex and efficient devices, a complete understanding of the fundamental principles for actuation and the factors that exert an effect in the output of the micropump, as well as an experimental assessment of some of their potential applications, is necessary. The work highlighted in this dissertation covers all the studies performed with enzyme-
powered pumps, from the development of the micropump design, to the efforts invested in understanding the enzyme pump concept as a whole. The data collected to date, aims to expand our knowledge about enzyme-
powered micropumps from the inside out: not only by exploring the different applications of these devices at the macroscale, but also by investigating in depth the mechanism of pump activation behind these systems. Specifically, we have focused on: (1) The general features that characterize the pumping behavior observed in enzyme-
powered pumps, as well as the optimization of the device, (2) the possible mechanisms behind fluid motion, including the role of enzyme coverage and/or activity on the transduction of chemical energy into mechanical fluid flow in these devices, covering also the effect of the thermodynamics of the enzymatic reaction in the pumping behavior, and (3) the applicability of enzyme pumps as fluid flow-based inhibitor assays and as drug delivery devices. Our findings in each of these areas, gets us closer to our ultimate goal, where we aim to identify the optimal conditions needed for enzyme micropump operation, and construct a general model that could accurately predict enzyme micropump behavior for any enzyme-substrate combination.
The information aforementioned has been divided in four chapters. Chapter 1 gives a quick glance into the development of enzyme-
powered micropumps: from the systems and observed behaviors inspiring this work, to the first systems that were…
Advisors/Committee Members: Ayusman Sen, Dissertation Advisor/Co-Advisor, Ayusman Sen, Committee Chair/Co-Chair, Thomas E. Mallouk, Committee Member, Christine D. Keating, Committee Member, Darrell Velegol, Outside Member.
Subjects/Keywords: enzyme micropumps; self-powered systems; catalysis; sensors; enzymes
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Manager
APA (6th Edition):
Ortiz, I. (2017). Enzyme-Powered Pumps: From Fundamentals to Applications. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/13844iuo103
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ortiz, Isamar. “Enzyme-Powered Pumps: From Fundamentals to Applications.” 2017. Thesis, Penn State University. Accessed January 22, 2021.
https://submit-etda.libraries.psu.edu/catalog/13844iuo103.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ortiz, Isamar. “Enzyme-Powered Pumps: From Fundamentals to Applications.” 2017. Web. 22 Jan 2021.
Vancouver:
Ortiz I. Enzyme-Powered Pumps: From Fundamentals to Applications. [Internet] [Thesis]. Penn State University; 2017. [cited 2021 Jan 22].
Available from: https://submit-etda.libraries.psu.edu/catalog/13844iuo103.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ortiz I. Enzyme-Powered Pumps: From Fundamentals to Applications. [Thesis]. Penn State University; 2017. Available from: https://submit-etda.libraries.psu.edu/catalog/13844iuo103
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
27.
Askari, Hassan.
Towards Intelligent Tire and Self-Powered Sensing Systems.
Degree: 2019, University of Waterloo
URL: http://hdl.handle.net/10012/14646
► Tires are the interface between a vehicle and the ground providing forces and isolation to the vehicle. For vehicle safety, stability, maintenance, and performance, it…
(more)
▼ Tires are the interface between a vehicle and the ground providing forces and isolation to the
vehicle. For vehicle safety, stability, maintenance, and performance, it is vital to estimate or measure tire forces,
inflation pressure, and contact friction coefficient. Estimation methods can predict tire forces to some extent
however; they fail in harsh maneuvers and are dependent on road surface conditions for which there is no robust
estimation method. Measurement devices for tire forces exist for vehicle testing but at the cost of tens of thousands of dollars. Tire pressure-monitoring sensors (TPMS) are the only sensors available in newer and
higher end vehicles to provide tire pressure, but there are no sensors to measure road surface condition or tire
forces for production vehicles.
With the prospect of autonomous driving on roads in near future, it is paramount to make the vehicles safe on
any driving and road condition. This is only possible by additional sensors to make up for the driver’s cognitive
and sensory system. Measuring road condition and tire forces especially in autonomous vehicles are vital in their
safety, reliability, and public confidence in automated driving. Real time measurement of road condition and
tire forces in buses and trucks can significantly improve the safety of road transportation system, and in
miming/construction and off-road vehicles can improve performance, tire life and reduce operational costs.
In this thesis, five different types of sensors are designed, modelled, optimized and fabricated with the objective of developing an intelligent tire. In order to design these sensors,~both electromagnetic generator (EMG) and triboelectric nanogenerators (TENG) are used. In the first two initial designed sensors, with the combination of EMG and TENG into a single package, two hybridized sensors are fabricated with promising potential for self-powered sensing. The potential of developed sensors are investigated for tire-condition monitoring system (TCMS). Considering the impressive properties of TENG units of the developed hybridized devices, three different flexible nanogenerators, only based on this newly developed technology, are developed for TCMS. The design, modelling, working mechanism, fabrication procedure, and experimental results of these TENG sensors are fully presented for applications in TCMS. Among these three fabricated sensors, one of them shows an excellent capability for TCMS because of its high flexibility, stable and high electrical output,and an encapsulated structure. The high flexibility of developed TENG sensor is a very appealing feature for TCMS, which cannot be found in any available commercial sensor. The fabricated TENG sensors are used for developing an intelligent tire module to be eventually used for road testing. Several laboratory and road tests are performed to study the capability of this newly developed TENG-based sensor for tire-condition monitoring system. However the development of this sensor is in its early stage, it shows a…
Subjects/Keywords: Self-powered sensing; intelligent tires; nanogenerators; flexible devices
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APA ·
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MLA ·
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APA (6th Edition):
Askari, H. (2019). Towards Intelligent Tire and Self-Powered Sensing Systems. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/14646
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Askari, Hassan. “Towards Intelligent Tire and Self-Powered Sensing Systems.” 2019. Thesis, University of Waterloo. Accessed January 22, 2021.
http://hdl.handle.net/10012/14646.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Askari, Hassan. “Towards Intelligent Tire and Self-Powered Sensing Systems.” 2019. Web. 22 Jan 2021.
Vancouver:
Askari H. Towards Intelligent Tire and Self-Powered Sensing Systems. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10012/14646.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Askari H. Towards Intelligent Tire and Self-Powered Sensing Systems. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/14646
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Johannesburg
28.
Fourie, Dehann.
Optimisation of electric long endurance unmanned aerial vehicles.
Degree: 2012, University of Johannesburg
URL: http://hdl.handle.net/10210/4968
► M.Ing.
Sustained or long endurance solar powered flight is defined as an aircraft capable of main- taining flight through multiple day-night flight cycles, using only…
(more)
▼ M.Ing.
Sustained or long endurance solar powered flight is defined as an aircraft capable of main- taining flight through multiple day-night flight cycles, using only solar power and rechargable energy stores. The project is focused on developing solar powered flight theory and real-world unmanned aerial vehicle implementations. The important aspects of system design are es- tablished and studied at a fundamental theoretical level. A preliminary design is conducted with endurance optimisation as the main aim. The optimisation process aims to establish a theoretical basis for sustained solar powered flight. The project is started with a feasibility and relevance study. A literature study was used to gather the required theoretical information. A novel theoretical preliminary design basis is conducted. The study is aimed at answering many questions in the field. The study is the first to show how previously varied aircraft from 3 m to 80 m are valid solutions to the long endurance flight requirement. The optimisation results correlates well with the current state-of-the-art. The theoretical models were then characterised through the development of two unmanned aerial vehicles. The development required a multidisciplinary integration of various fields. The development process was characterised and discussed. Flight automation was successfully integrated into the system. Multiple test flights were conducted. An interpretation of multi- faceted results are given. This project has contributed to international theory regarding solar powered and sustained endurance aircraft. Many specific contributions were made to the field. The project has achieved multiple unofficial records from the flight tests in the Southern Hemisphere and African continent.
Subjects/Keywords: Solar powered aircraft; Drone aircraft; Sustained flight; Solar energy
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APA (6th Edition):
Fourie, D. (2012). Optimisation of electric long endurance unmanned aerial vehicles. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/4968
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fourie, Dehann. “Optimisation of electric long endurance unmanned aerial vehicles.” 2012. Thesis, University of Johannesburg. Accessed January 22, 2021.
http://hdl.handle.net/10210/4968.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fourie, Dehann. “Optimisation of electric long endurance unmanned aerial vehicles.” 2012. Web. 22 Jan 2021.
Vancouver:
Fourie D. Optimisation of electric long endurance unmanned aerial vehicles. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10210/4968.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fourie D. Optimisation of electric long endurance unmanned aerial vehicles. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/4968
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
29.
Swart, Benjamin Dawid.
A Method for accurate measurement of heliostat mirror orientation.
Degree: MEng, Electrical and Electronic Engineering, 2017, Stellenbosch University
URL: http://hdl.handle.net/10019.1/101038
► ENGLISH ABSTRACT: Heliostat tracking is a critical component of the solar field of concentrating solar power central receiver systems and can be the source of…
(more)
▼ ENGLISH ABSTRACT: Heliostat tracking is a critical component of the solar field of concentrating
solar power central receiver systems and can be the source of significant losses
in power and profit when it lacks the necessary accuracy. The current industry
norm seems to be open-loop tracking using an error model for a tracking error
of one milliradian, with error model parameters requiring periodic recalibration.
In this thesis a method is developed which is able to determine the orientation
of all heliostats in the field simultaneously, providing near real-time feedback
to the control system, removing the need for recalibration while maintaining
an accurate tracking accuracy.
The method works by determining the positions of three or more distinct points
on the heliostat mirror surface. These points form a plane which is then used
to calculate the heliostat normal vector. The performance of the method is
analysed and quantified using simulations, and experiments are used to validate
the theoretical models. Quantification of the system performance is used to
determine the initial feasibility of the method.
Results indicate that for the error sources included in the model it is theoretically
possible to achieve a tracking error in the order of one milliradian or
less. Furthermore, experimental results are found to differ by only 5% from
theoretical results. This is promising and merits further investigation into the
method as a possible solution to the current heliostat tracking problem.
AFRIKAANSE OPSOMMING: Heliostaat volging (die vermo e om die son te volg) is 'n kritiese komponent van
die sonveld in gekonsentreerde son-energie sentrale ontvangerstelsels. Indien
die nodige akkuraatheid ontbreek, kan dit aansienlike energie{ en winsverliese
tot gevolg h^e. Die huidige industry standaard is o enskynlik opelus-volging met
'n foutmodel wat 'n volgfout van een milliradiaal tot gevolg het, met foutmodel
parameters wat periodiese herkalibrasie noodsaak. In hierdie tesis word 'n
metode ontwikkel wat die ori entasie van al die heliostate in 'n veld tegelykertyd
kan bepaal. Dit voorsien byna-intydse terugvoer aan die beheerstelsel wat
herkalibrasie onnodig maak terwyl volging steeds akkuraat kan plaasvind.
Die metode werk deur die posisies van drie of meer unieke punte op die
heliostaatspie el se oppervlak te bepaal. Hierdie punte vorm 'n vlak wat gebruik
kan word om die heliostaat se ori entasie te bereken. Die doeltreffendheid van
die metode word geanaliseer en gekwantifiseer deur middel van simulasies en
eksperimente word uitgevoer om die teoretiese modelle te bevestig.
Die resultate wys dat vir die foutbronne wat in die model ingesluit is dit
teoreties moontlik is om 'n volgfout in die orde van een milliradiaal of minder te
behaal. Daar is ook bevind dat eksperimentele resultate met minder as 5% van
teoretiese resultate verskil. Dit is belowend en verdien verdere ondersoek na
hierdie metode as moontlike oplossing vir die huidige probleem met heliostaat
volging.
Advisors/Committee Members: Treurnicht, J., Engelbrecht, H. A., Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering..
Subjects/Keywords: Heliostat; UCTD; Solar-powered aircraft; Heliostat – Mirrors – Measurement
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APA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Swart, B. D. (2017). A Method for accurate measurement of heliostat mirror orientation. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/101038
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Swart, Benjamin Dawid. “A Method for accurate measurement of heliostat mirror orientation.” 2017. Thesis, Stellenbosch University. Accessed January 22, 2021.
http://hdl.handle.net/10019.1/101038.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Swart, Benjamin Dawid. “A Method for accurate measurement of heliostat mirror orientation.” 2017. Web. 22 Jan 2021.
Vancouver:
Swart BD. A Method for accurate measurement of heliostat mirror orientation. [Internet] [Thesis]. Stellenbosch University; 2017. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10019.1/101038.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Swart BD. A Method for accurate measurement of heliostat mirror orientation. [Thesis]. Stellenbosch University; 2017. Available from: http://hdl.handle.net/10019.1/101038
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
King Abdullah University of Science and Technology
30.
Kurniasari, Novita.
Application of Pre-coated Microfiltration Ceramic Membrane with Powdered Activated Carbon for Natural Organic Matter Removal from Secondary Wastewater Effluent.
Degree: 2012, King Abdullah University of Science and Technology
URL: http://hdl.handle.net/10754/262792
► Ceramic membranes offer more advantageous performances than conventional polymeric membranes. However, membrane fouling caused by Natural Organic Matters (NOM) contained in the feed water is…
(more)
▼ Ceramic membranes offer more advantageous performances than conventional
polymeric membranes. However, membrane fouling caused by Natural Organic
Matters (NOM) contained in the feed water is still become a major problem for
operational efficiency. A new method of ceramic membrane pre-coating with
Powdered Activated Carbon (PAC), which allows extremely contact time for
adsorbing aquatic contaminants, has been studied as a pre-treatment prior to
ceramic microfiltration membrane. This bench scale study evaluated five different
types of PAC (SA Super, G 60, KCU 6, KCU 8 and KCU 12,). The results showed that
KCU 6 with larger pore size was performed better compared to other PAC when
pre-coated on membrane surface. PAC pre-coating on the ceramic membrane with
KCU 6 was significantly enhance NOM removal, reduced membrane fouling and
improved membrane performance. Increase of total membrane resistance was
suppressed to 96%. The removal of NOM components up to 92%, 58% and 56% for
biopolymers, humic substances and building blocks, respectively was achieved at
pre-coating dose of 30 mg/l. Adsorption was found to be the major removal
mechanism of NOM. Results obtained showed that biopolymers removal are
potentially correlated with enhanced membrane performance.
Subjects/Keywords: cermanic membrane; powered activated carbon; pre-coating; natural organic matter
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APA ·
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APA (6th Edition):
Kurniasari, N. (2012). Application of Pre-coated Microfiltration Ceramic Membrane with Powdered Activated Carbon for Natural Organic Matter Removal from Secondary Wastewater Effluent. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/262792
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kurniasari, Novita. “Application of Pre-coated Microfiltration Ceramic Membrane with Powdered Activated Carbon for Natural Organic Matter Removal from Secondary Wastewater Effluent.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed January 22, 2021.
http://hdl.handle.net/10754/262792.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kurniasari, Novita. “Application of Pre-coated Microfiltration Ceramic Membrane with Powdered Activated Carbon for Natural Organic Matter Removal from Secondary Wastewater Effluent.” 2012. Web. 22 Jan 2021.
Vancouver:
Kurniasari N. Application of Pre-coated Microfiltration Ceramic Membrane with Powdered Activated Carbon for Natural Organic Matter Removal from Secondary Wastewater Effluent. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10754/262792.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kurniasari N. Application of Pre-coated Microfiltration Ceramic Membrane with Powdered Activated Carbon for Natural Organic Matter Removal from Secondary Wastewater Effluent. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/262792
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] ▶
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Open Access Theses and Dissertations