Dissertations / Theses on the topic 'Development Power'
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Stone, Michael H. "Power Development." Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/etsu-works/4581.
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Stone, Michael H. "Power Development in Sport." Digital Commons @ East Tennessee State University, 2014. https://dc.etsu.edu/etsu-works/4563.
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Stone, Michael H. "Power Development among Explosive Athletes." Digital Commons @ East Tennessee State University, 2007. https://dc.etsu.edu/etsu-works/4500.
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Stone, Michael H., P. Cormie, Hugh S. Lamont, and Margaret E. Stone. "Development of Strength and Power." Digital Commons @ East Tennessee State University, 2016. https://www.amzn.com/0415578213.
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An effective strength and conditioning program is an essential component of the preparation of any athlete or sportsperson. Strength and Conditioning for Sports Performance is a comprehensive and authoritative introduction to the theory and practice of strength and conditioning, providing students, coaches and athletes with everything they need to design and implement effective training programs.
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Liu, Ning. "Our Power over Our Power : A paradigm shift in thederegulated power market." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-235464.
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A higher share of renewable energy in power generation is one of most ambitious goals for sustainable development under the increasing pressure of climate change. On the deregulated electricity market in Sweden, the consumers are able to choose their electricity from a specific supplier and a specific energy source, which gives them the opportunity to execute their consumer power to have positive impacts on increasing energy efficiency and renewable electricity generation by stopping buying electricity produced from fossil fuels. A new paradigm is thus proposed in this paper which provides a new perspective on purchase of the product electricity. The new paradigm makes electricity a specified product for a specific customer, the electricity audited is never mixed with that not audited, because all electricity which is audited can be traced. The aim of this study is to provide a greater understanding of the new paradigm on the deregulated electricity market. By conducting a willingness to pay survey and several deep interviews, it analyzed the main factors hindering the customers’understanding of the new market dynamics in terms of active choice in ‘green’ electricity and stopping buying fossil electricity. The results and discussions show that the new paradigm could facilitate shedding light on some important implications for strategic decision making in power companies, for policy-makers as well as customers.
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Gammon, P. M. "Development of SiC heterojunction power devices." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/44625/.
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Silicon carbide (SiC), with its wide bandgap, high thermal conductivity and natural oxide is a substrate that has given rise to a new generation of power devices than can operate at high temperature, high power and high frequency, though the material is not without its problems. SiC "heterojunction devices" are layers of germanium (Ge) or silicon (Si) that are deposited via molecular beam epitaxy (MBE) or wafer bonded onto the SiC surface. These narrow bandgap thin films can provide a high mobility channel region overcoming SiC's crippling channel mobility, which is most often made worse by a high density of interface states. Concentrating predominantly on Ge/SiC heterojunctions, this thesis characterises the physical and electrical nature of these structures, investigating the rectifying properties of the heterojunction interface and the ability of these layers to support a depletion region. A physical analysis of the layers revealed that the Ge formed in an unexpectedly uniform fashion, given the large lattice mismatch involved. At a deposition temperature of 500oC the Ge initially clumped into wide, shallow islands before merging, forming at best a 300 nm polycrystalline layer with a surface roughness of only 6 nm. This was in contrast to MBE deposited Si/SiC layers that formed tall islands that at 1 μm thick, still had not merged. After being formed into Ge/SiC heterojunction diodes they were electrically characterised. The layers displayed near ideal (η = 1:05) turn-on characteristics, low turn-on voltage (approximately 0.3 V less than Ni/SiC SBDs), reasonable on-resistance (12 mΩcm2) and minimal leakage current. The devices were shown to suffer severe Fermi level pinning that defined the way the materials' bands aligned. This occurred as a result of an inhomogeneous interface that also caused fluctuations in the size of the Schottky barrier height across the interface. New characterisation techniques relating to these phenomena were applied to a heterojunction for the first time. MBE formed Ge/SiC layers and wafer bonded Si/SiC layers were formed into MOS capacitors through the deposition of the high-K dielectric hafnium oxide (HfO2). The increased conduction band offset between oxide and narrow bandgap semiconductor suppressed leakage problems often seen in HfO2/SiC structures. Capacitance-voltage results showed that they could both support a depletion region, though the best results came from the MBE Ge/SiC diodes. Current-voltage results showed that the more uniform Si/SiC devices could block 3.5 MV/cm.
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Piedra, Daniel Ph D. Massachusetts Institute of Technology. "Development of gallium nitride power transistors." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/66454.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2011."November 2010." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 78-79).
GaN-based high-voltage transistors have outstanding properties for the development of ultra-high efficiency and compact power electronics. This thesis describes a new process technology for the fabrication of GaN power devices optimized for their use in efficient power distribution systems in computer micro-processors. An existing process flow was used to fabricate the baseline single-finger transistors and additional process steps were developed and optimized to fabricate multi-finger devices with total gate widths up to 12mm. These transistors offer the current and on-resistance levels required by future GaN-based power converters. Transistors with various gate widths were fabricated and characterized by DC and capacitancevoltage measurements to study how the main transistor metrics scale with gate width.
by Daniel Piedra.
M.Eng.
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Lotter, Paul. "Development of feedforward RF power amplifier." Thesis, Cape Peninsula University of Technology, 2006. http://hdl.handle.net/20.500.11838/2206.
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Thesis (MTech(Electrical Engineering))--Cape Peninsula University of Technology, 2006.Electronic communication systems have become an integral part of our everyday lives. RF (Radio Frequency) power amplifiers form part of the fundamental building blocks of an electronic communication system. RF power amplifiers can also be one of the major causes of distortion in an electronic communication system. This thesis describes the linearity requirement for a RF power amplifier that is used in a transmitter section of an electronic communication system. Furthermore, five different linearisation techniques are presented and their characteristics compared. Since a power amplifier employing the Feedforward linearisation technique was designed, built and tested, this thesis focuses on the Feedforward technique. The design methods for the various Feedforward components are presented. The measured parameters of the Feedforward linearised amplifier are compared with the measured parameters of a non-linearised amplifier.
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Bevan, Huw R. "Power development in professional rugby players." Thesis, Swansea University, 2011. https://cronfa.swan.ac.uk/Record/cronfa42313.
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The ability to develop high levels of muscular power is considered an essential component of success in many sporting activities. Currently, a number of training methods exist aimed at developing muscular power such as training at the optimal load for Peak Power Output (PPO) and complex training, however to date there is no real consensus as to the most effective way of implementing these training modalities into elite sport. The aim of the first experiment was to determine the optimal load for PPO during the Jump Squat, Bench Press Throws and Hang Power Clean in a group of professional rugby players. This was achieved by comparing the PPO at various loads of the subject's predetermined estimated 1 RM in a randomised and balanced order for Hang power cleans, (HPC) Bench Press Throws (BBT) and Jump Squats (JS). The results of this study indicate that relative intensity had a significant effect on PPO during the HPC, BBT and the JS and that peak values were obtained in our athletes when working against an external load that was equivalent to 80% IRM in the HPC, 30% 1 RM in the BBT and with BM only in the JS. The second experiment aimed to determine the required recovery time for maximal benefits between the heavy resistance training (HRT) and subsequent upper and lower body explosive performance in a group of professional rugby players. Twenty professional rugby players performed a countermovement jump (CMJ) at baseline and -15 s, 4, 8, 12, 16, 20 and 24 min following a HRT bout (3 sets of 3 repetitions 87% IRM of Squat). Power output (PO), jump height and peak rate of force development (PRFD) were determined for all countermovement jumps. Performance increased significantly following 8 min recovery between the HRT and the CMJ (p < 0.001) (e.g. jump height increased by 4.9 +/- 3.0 %). The results of this experiment demonstrate that muscle performance during a CMJ can be significantly enhanced following bouts of HRT providing adequate recovery (?8 min) is given between the HRT and the explosive activity. The aim of the final experiment was to determine the effect of PAP on sprint performance in professional rugby players. Sixteen professional male rugby players performed five, 10 m sprints (with 5 m split): baseline, 4, 8, 12 and 16 min after the preload stimulus (1 set of 3 repetitions of the back squat at 91% IRM). No significant time effect over the duration of the study with regard to 5 m and 10 m sprint times. However, when individual responses to PAP were taking into account a significant improvement in sprint performance was observed over both 5 and 10 m compared to the baseline sprint. The results of this experiment indicate that sprinting performance is enhanced following a pre-load stimulus providing adequate and individualised recovery is given between the two activities. This may have important implications for training speed.
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Zhou, Yun, and Quanfeng Wang. "Wind power in China." Thesis, University of Gävle, Department of Technology and Built Environment, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-4879.
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n today's complex environment, clear and sustainable energy is needed to support society development. How to develop the sustainable energy is a core issue in China. Compared with traditional energy, Wind energy has many advantages such as non-fuel cost, less pollution. And wind energy has the absolute advantage that it is worldwide available. In many courtiers, wind energy has become a major part of their plans for sustainable development. The primary goal of this paper is to analysis advantages and disadvantages of wind power in China and the development potential of wind power in China. In this paper the main methodology is using the information about wind power in China, which is including current situation, development stage, industry development stage, and combining the real case to analysis wind power development potential in China. There are six parts of this paper which are the overview of wind power in china; case description, analysis, conclusions, suggestion, development perspectives and imagination In the first part, the overview of wind power in china, the history of wind power in china, wind resource distribution, wind power development stages, the situation of some key regions, wind power industry develop stage and also some policies about wind power of Chinese government are discussed. The goal of this part is giving some fundamental information about wind power in China. In the second part, a real case has been described, and according to this case, the construction cost of a wind power plant in China has been discussed. The advantages and disadvantages of wind power are also analyzed based on this case study, such as long-team return, environmental impact, and also some other problem analysis. After the analysis parts, there are the conclusion parts, those parts are about the development perspectives and imagination of wind power in China.
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Zaar, Emil. "Photovoltaic power potential on Gotland: A comparison with load, wind power and power export possibilities." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-295997.
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The Swedish Island of Gotland provides an interesting case of how renewable energy technologies can be combined and integrated into the electricity system. The study simulates the load, wind power production and PV power production to estimate the PV power potential for existing buildings on Gotland. The theoretical PV power potential on Gotland is calculated to be 667 MW. The PV power potential is split between 28% for dwelling buildings, 9% for multi-dwelling buildings, 7% for industry and 56% for other buildings. The current limit for wind power on Gotland is 195 MW. With the installed capacity of 194 MW wind power, an additional of 22 MW of PV power is possible to integrate without increasing the hours of overload on the power cable. With the prospected submarine power cable, a total of 529 MW PV power is possible to integrate with the existing 194 MW of wind power.
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Srirattana, Nuttapong. "High-Efficiency Linear RF Power Amplifiers Development." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6899.
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Next generation mobile communication systems require the use of linear RF power amplifier for higher data transmission rates. However, linear RF power amplifiers are inherently inefficient and usually require additional circuits or further system adjustments for better efficiency. This dissertation focuses on the development of new efficiency enhancement schemes for linear RF power amplifiers.
The multistage Doherty amplifier technique is proposed to improve the performance of linear RF power amplifiers operated in a low power level. This technique advances the original Doherty amplifier scheme by improving the efficiency at much lower power level. The proposed technique is supported by a new approach in device periphery calculation to reduce AM/AM distortion and a further improvement of linearity by the bias adaptation concept.
The device periphery adjustment technique for efficiency enhancement of power amplifier integrated circuits is also proposed in this work. The concept is clearly explained together with its implementation on CMOS and SiGe RF power amplifier designs. Furthermore, linearity improvement technique using the cancellation of nonlinear terms is proposed for the CMOS power amplifier in combination with the efficiency enhancement technique.
In addition to the efficiency enhancement of power amplifiers, a scalable large-signal MOSFET model using the modified BSIM3v3 approach is proposed. A new scalable substrate network model is developed to enhance the accuracy of the BSIM3v3 model in RF and microwave applications. The proposed model simplifies the modeling of substrate coupling effects in MOS transistor and provides great accuracy in both small-signal and large-signal performances.
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Zhang, Meishenglan. "Power-Aware Software Development For EMCA DSP." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-215711.
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The advent of FinFET technology necessitates a shift towards early dynamic power awareness, not only for ASIC block designers but also for software engineers that develop code for those blocks. CMOS dynamic power is typically reduced by optimizing the RTL models in terms of switching activity and clock gating efficiency. There is not much to be done after a model is committed. Programmable blocks though, like the Phoenix 4 Digital Signal Processor(EMCA Ericsson Multi Core Architecture), can have a “second chance” for low power even after silicon is produced by efficient use of the software source code in order to impact the dynamic power metrics. This requires a "full-stack" of power awareness all the way from the DSP hardware model up to the software development IDE. This Thesis work aims at two goals. The first goal is to realize a prototype, encapsulated flow for the DSP software developers which connects software IDE entry point to the low level, complex hardware power analysis tools. The second goal is to demonstrate how software can be used as an auxiliary knob to exploit potential tradeoffs in order to improve the DSP's dynamic power metrics. This hypothesis is tested by rescheduling operations on the DSP's resources either manually or implicitly through the compiler. Moreover, a method to align and compare algorithms, when it is possible to tradeoff performance for power, is devised and the estimation results are compared against real silicon measurements. The results show that the developed analysis flow is reliable and very efficient for the given purpose, even for people who have limited knowledge about low level hardware to facilitate quick power exploration and profiling. This is mainly realized by a unique feature that associates specific lines in the source code with the toggling behavior of the hardware model while execution. Based on that, the tradeoffs between power and performance for several testcases are demonstrated at both the assembly and C levels with good correlation versus silicon. Overall, this work's outcome hints that the compiler and software teams have many options to consider in order to optimize dynamic power for products already in the field.
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Smith, Cheryl Lynne. "The power of coaching in staff development." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ59481.pdf.
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Ehlers, Bodo. "Development of high power diode laser systems /." Aachen : Shaker, 2005. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014901694&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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Tappin, Peter G. R. "Design and development of SIC power devices." Thesis, University of Newcastle Upon Tyne, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.514463.
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Kong, Fei. "Development of series connected photovoltaic power inverter." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609938.
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Kamanzi, Janvier. "Thermal electric solar power conversion panel development." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2527.
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Thesis (DTech (Engineering))--Cape Peninsula University of Technology, 2017.The world has been experiencing energy-related problems following pressuring energy demands which go along with the global economy growth. These problems can be phrased in three paradoxical statements: Firstly, in spite of a massive and costless solar energy, global unprecedented energy crisis has prevailed, resulting in skyrocketing costs. Secondly, though the sun releases a clean energy, yet conventional plants are mainly being run on unclean energy sources despite their part in the climate changes and global warming. Thirdly, while a negligible percentage of the solar energy is used for power generation purposes, it is not optimally exploited since more than its half is wasted in the form of heat which contributes to lowering efficiency of solar cells and causes their premature degradation and anticipated ageing. The research is geared at addressing the issue related to unsatisfactory efficiencies and anticipated ageing of solar modules. The methodology adopted to achieve the research aim consisted of a literature survey which in turn inspired the devising of a high-efficiency novel thermal electric solar power panel. Through an in-depth overview, the literature survey outlined the rationale of the research interest, factors affecting the performance of PVs as well as existing strategies towards addressing spotted shortcomings. While photovoltaic (PV) panels could be identified as the most reliable platform for sunlight-to-electricity conversion, they exhibit a shortcoming in terms of following the sun so as to maximize exposure to sunlight which negatively affects PVs’ efficiencies in one hand. On the other hand, the inability of solar cells to reflect the unusable heat energy present in the sunlight poses as a lifespan threat. Strategies and techniques in place to track the sun and keep PVs in nominal operational temperatures were therefore reviewed.
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Jagasivamani, Meenatchi. "Development of a Low-Power SRAM Compiler." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34963.
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Considerable attention has been paid to the design of low-power, high-performance SRAMs (Static Random Access Memories) since they are a critical component in both hand-held devices and high-performance processors. A key in improving the performance of the system is to use an optimum sized SRAM.
In this thesis, an SRAM compiler has been developed for the automatic layout of memory elements in the ASIC environment. The compiler generates an SRAM layout based on a given SRAM size, input by the user, with the option of choosing between fast vs. low-power SRAM. Array partitioning is used to partition the SRAM into blocks in order to reduce the total power consumption.
Experimental results show that the low-power SRAM is capable of functioning at a minimum operating voltage of 2.1 V and dissipates 17.4 mW of average power at 20 MHz. In this report, we discuss the implementation of the SRAM compiler from the basic component to the top-level SKILL code functions, as well as simulation results and discussion.Master of Science
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Zhou, Renjie. "DEVELOPMENT OF HIGH POWER FIBER LASER TECHNOLOGIES." University of Dayton / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1271970621.
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Jiang, Yimin. "Development of advanced power factor correction techniques." Diss., Virginia Polytechnic Institute and State University, 1994. http://hdl.handle.net/10919/53609.
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Three novel power factor correction (PFC) techniques are developed for both single-phase and three-phase applications. These techniques have advantages over the conventional approaches with regard to the converter efficiency, power density, cost, and reliability for many applications.
The single-phase parallel PFC (PPFC) technique was established. Different from the conventional two-cascade-stage scheme, the PPFC technique allows 68% of input power to go to the output through only one time high frequency power conversion, but still achieves both unity power factor and tight output regulation. A family of PPFC converters were proposed for different power levels, which are simpler and more efficient than the conventional two-cascade-stage systems. Since isolated boost converters are adopted as the main power stage in some of the PPFC converters, a device based soft-switching technique was proposed for using IGBTs as the main power switches, which ensures the lower cost and higher efficiency benefits of the PPFC technique.
The single-ended boost converter is the most frequently used converter in the single-phase PFC applications. For high power and/or high voltage applications, the major concerns of the conventional boost converter are the inductor volume and weight, and Iosses on the power devices, which will affect converter efficiency, power density, and cost. In this dissertation, a novel three-level boost converter was developed, which can use a much smaller inductor and lower voltage devices than the conventional one, yielding higher power density, higher efficiency, and lower cost.
In three-phase applications, the three-phase boost rectifier is the most popular topology for the PFC purpose. A novel high performance boost PFC rectifier was developed, which provides several superior features than the conventional one with nearly no cost increase. lt inherently provides six-step PWM operation, which is the optimal PWM scheme with no circulating energy, minimum input ripple current, and minimum . switching events. It also greatly reduces the bridge diode reverse recovery loss, which is one of the major switching Iosses in the conventional three-phase boost rectifier. Furthermore, it can adopt very simple soft-switching techniques even with three independent analog controllers to further improve the performance. Several simple soft switched three-phase boost rectifiers have been developed. Besides, the bridge shoot-through problem is virtually eliminated. As a result, these new three-phase boost rectifiers have higher efficiency, higher power density, lower cost, and higher reliability compared with the conventional one.Ph. D.
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Grillos, Tara. "Participation, Power and Preferences in International Development." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:23845452.
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Participatory development is widely touted as the remedy for ineffective and disempowering top-down development models of the past. However, participation can take many different forms, so an important open question for effective delivery of development assistance is: Which forms of participation influence which development outcomes under which circumstances? In this dissertation, I identify six key areas of research related to participatory development: the initial adoption of a participatory institution, the decision by individuals to participate or not, the direct outcomes of the participatory process, the effects on participants themselves, changes in the process over time, and carefully selected comparisons across contexts. I then make specific contributions to three of these areas through empirical research.
The first essay, Popular Participation, Reciprocity Norms and Conservation Incentives in Bolivia, examines the decision to participate. In it, I compare the characteristics of participants and non-participants in a compensation program for environmental conservation in Bolivia, and I show that in addition to material incentives, social embeddedness plays a role in motivating participation. The second essay, Poverty Targeting and Elite Capture in Participatory Planning in Indonesia, addresses the direct outcomes of participation. In it, I examine the geographical distribution of the outcomes of a participatory planning process in Indonesia, and I show that the benefits are captured most by the least poor areas, but that this occurs in ways distinct from how capture is typically conceived. The third essay, Gender Inequality and the Multi-Dimensionality of Power in Northern Kenya, addresses the effects of participation on the empowerment of participants themselves. In it, I assess the impact on women’s empowerment of a program meant to enhance women’s political participation in northern Kenya, and I find that while the program largely fails to promote political participation, it has an impact on women’s empowerment within the household, very likely due to a component of the program which engaged directly with men.
Overarching themes that emerge across these studies include (1) the importance of increased conceptual clarity not only with respect to the various forms that participation can take and the various goals it can be invoked to seek, but also regarding various hypothesized effects of and motivations for participation, (2) the potential relevance of the implementing agency and its relationship with pre-existing, overlapping social institutions, and (3) the usefulness of engaging with literature on psychology and behavioral economics. Understudied areas for future research include the evolution over time of a particular participatory process and more systematic comparisons of participatory processes across settings.Public Policy
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Sweetingham, Sarah. "Power and social justice in community development: Improving 'government towards development'." Thesis, Sweetingham, Sarah (2014) Power and social justice in community development: Improving 'government towards development'. Masters by Coursework thesis, Murdoch University, 2014. https://researchrepository.murdoch.edu.au/id/eprint/24865/.
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Whilst there exists a strong academic tradition regarding the importance of critique and reflexivity within community development theory, it is evident that the vast majority of the critical examination undertaken constitutes internal, methodological critiques of specific aspects of community development practice. This thesis sets about critically examining the theory of community development in its entirety, through an identification and comparison of the field’s core tenets and principles by way of a review of the prominent literature. Through this examination, two key issues will be identified. The first is that, partly due to conceptual unclarity, community development has the potential to place the responsibility for rectifying inequality unjustly. The second is that community development theory generally seems to reflect an inadequate understanding of the concept of power. Born out of this critique will be some further analysis, designed to propose some potential ways in which to address the issues identified. It is argued that community development should strive to model community involvement specifically within a framework of social justice, through the adoption of a rights-based approach, as well as attempt to incorporate a more complex, Foucouldian conception of power into its core theorising. It is further proposed that community development must overtly recognise that it, as a discipline, constitutes a form of government. Finally, the thesis advocates for a shift in community participation, away from a simple involvement in decision making, towards processes which act to challenge the dominant discourses and political rationalities which serve to perpetuate inequality.
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Stone, Michael H., William A. Sands, Kyle C. Pierce, Michael W. Ramsey, and G. Gregory Haff. "Power and Power Potentiation among Strength-Power Athletes: Preliminary Study." Digital Commons @ East Tennessee State University, 2008. https://dc.etsu.edu/etsu-works/4138.
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Purpose: To assess the effects of manipulating the loading of successive sets of midthigh clean pulls on the potentiation capabilities of 7 international-level US weightlifters (4 men, 3 women).
Methods: Isometric and dynamic peak-force characteristics were measured with a force plate at 500 Hz. Velocity during dynamic pulls was measured using 2 potentiometers that were suspended from the top of the right and left sides of the testing system and attached to both ends of the bar. Five dynamic-performance trials were used (in the following order) as the potentiation protocol: women at 60, 80, 100, 120, and 80 kg and men at 60, 140, 180, 220, and 140 kg. Trials 2 vs 5 were specifically analyzed to assess potentiation capabilities. Isometric midthigh pulls were assessed for peak force and rate of force development. Dynamic lifts were assessed for peak force (PF), peak velocity (PV), peak power (PP), and rate of force development (RFD).
Results: Although all values (PF, PV, PP, and RFD) were higher postpotentiation, the only statistically higher value was found for PV (ICCα = .95, P = .011, η2 = .69).
Conclusions: Results suggest that manipulating set-loading configuration can result in a potentiation effect when heavily loaded sets are followed by a lighter set. This potentiation effect was primarily characterized by an increase in the PV in elite weightlifters.
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Treasure, Karen. "The power of empowerment : recognising power relations within 'development' for communities in Zambia." Thesis, University of Plymouth, 2009. http://hdl.handle.net/10026.1/1144.
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Empowerment has emerged as a key focus of development policy and practices in the contemporary era, where simultaneously a need for 'development' is ascribed due to historically determined power relations imposed through discourse and intervention. This research enquires into the contradiction inherent in assuming an intemational agenda to empower those who are continually disempowered. Through analysis of a series of case studies of development projects in Zambia, this research argues that the potential of the empowerment agenda is inherently limited by the ongoing structural conditions of development. In the cases studied, community members successfiilly achieve a form of 'subjective empowerment' which enables them to assume a more powerful role within the boundaries of action determined by their possible frameworks of opportunity. But these forms of power do not hold the potential to create communities which are relatively more powerful on the global stage. Progression to a form of 'objective empowerment' is constrained by the boundaries to power which are imposed through historically set and continually recreated power relations within the global political economy.
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Elamin, Abdallah E. M. M. "Strategy development processes in selected Sudanese enterprises." Thesis, Lancaster University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288980.
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Lamoreux, Thomas Edward. "Competitive development economic development and the inquiry into power relations in Missouri /." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4529.
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Thesis (M.A.) University of Missouri-Columbia, 2006.The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (June 26, 2007) Includes bibliographical references.
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Huang, Yan. "FAST RECONFIGURATION ALGORITHM DEVELOPMENT FOR SHIPBOARD POWER SYSTEMS." MSSTATE, 2005. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11012005-151018/.
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Today?s protection schemes for shipboard applications, such as the zone-based differential protection, are efficient, fast, and reliable for fault detection. However, these protection schemes do not consider the system stability or power balance problems that occur with fault isolation and the system reconfiguration. This thesis focuses on developing the extended protection function including the fast reconfiguration function that intends to maintain the power balance of the unfaulted subsystem. Graph theory is utilized to represent the shipboard power system topology in matrices, and matrix operations are developed to represent the corresponding power system topology change and evaluate the outcome of the fault. Intelligent search algorithms are implemented to find the possible system configuration after fault isolation with balanced power generation and load through merging possible connected systems and priority-based load shedding. The algorithms are successfully implemented in MATLAB m-files and tested on various shipboard power system configurations and fault scenarios.
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Russamee, Nilaped. "Development of a high power RF measurement system." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/48483/.
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This research project has developed a high power RF Measurement system in the Centre for High Frequency Engineering, Cardiff University. There are two main contributions of this thesis. The first contribution is the implementation of step attenuators in the RF high power measurement system, incorporated with the approach of using the Sparameter model for correction measured waveform in measurement software processing. The step attenuator is situated between the broadband directional couplers (which obtains the incident and reflected signal from the DUT) and signal receivers (such as a sampling oscilloscope or MTA). The aim of this implementation is to extend the dynamic range of the measurement system and to develop a technique for reducing the recalibration process while the measurement system needs more attenuation in the signal condition part of the measurement system. These benefits allow the quick and convenient characterisation of the DUT under large signal excited environment. The second contribution is the further development of the Harmonic Bypass Structure (HBS), which is used instead of the step attenuator. The advantage of a HBS is that it can overcome the harmonic distortion drawback of the step attenuator approach. This drawback is caused by choosing improper high attenuation which is unsuitable for the measured signal condition. There is, therefore, a trade-off between the fundamental and harmonic frequencies. The advantage of an HBS is that it is capable of selecting the frequency band to attenuate while other frequencies can pass through to the receiver. In the meantime, the S-parameter model and modified measurement software are well suited similar to the step attenuator approach.
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Narayanaswamy, Lata. "Gender, power and the knowledge-for-development agenda." Thesis, Durham University, 2010. http://etheses.dur.ac.uk/530/.
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In a highly influential report written in 1998, The World Bank promoted the idea that a lack of information and knowledge was one of the key barriers to development in the Global South. The hegemonic discursive and financial control upheld by the World Bank and Northern donors continues to generate considerable criticism in development theory and practice. Yet the consequences of the proliferation of knowledge-based development practices into the routine functions of civil society that followed the establishment of the World Bank knowledge paradigm, even where these initiatives have been explicitly designed to be more ‘progressive’, is an area of development discourse and practice that remains under-researched. Using a qualitative, multi-site ethnography to analyse the discursive ‘site’ created by the information flows between and beyond a Northern-based gender information service and their users and recipients in New Delhi, India, this research investigates the function of knowledge-based development aid. Specifically, this study seeks to interrogate the capacity of donor-funded women’s NGOs and networks acting as information intermediaries to promote more positive development outcomes through the production and dissemination of information for a range of development stakeholders in both Northern and Southern contexts, notably those groups marginalised from the dominant development infrastructure. This research suggests that notions of ‘progressive’ knowledge practice are confronted by three main constraints. Firstly, discursive and pedagogical barriers embedded in information and its delivery persists despite mechanisms designed to improve accessibility. Secondly, the production and dissemination of increased volumes of information has become an end in itself, de-linked from their contribution to development outcomes. Finally, actors based in the ‘South’ remain unproblematised in knowledge-based development discourse and practice, thereby obscuring class and educational divides that reinforce inequalities not just between the North and the South but also within and between Southern contexts.
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Cornejo, Gómez César Alberto. "Methodology for the development of hydroelectric power plants." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/107592.
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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, School of Engineering, System Design and Management Program, Engineering and Management Program, 2016.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 73-75).
Hydropower has sufficient resources available and is actively promoted by Governments as part of their energy matrix, but its development is constrained by the difficulty of addressing location particularities, including technical features such as geology or hydrology, and institutional features such as social acceptance, environmental constraints and the regulatory framework. Project results emerge from the interactions of these Inherent Features and the Project Architecture and do not always meet stakeholders' expectations, leading to deficient project results and lost value. This thesis proposes a methodology for prototyping projects to reflect these particularities and inform project shaping and decision-making early in the process. The proposed methodology was built on three systems engineering and project complexity frameworks, and lessons learned from four case studies. Its contribution to hydropower development is related to (i) the incorporation of systems evolution over time on the development process, (ii) the identification and management of relationships among the various decomposed elements of the development, (iii) the identification of emergent properties from the interactions among all features, (iv) a prototype for developers to optimize or search for project architectures that meet stakeholders objectives while complying with restrictions, (v) the delivery of unbiased information for decision-makers, (vi) the opportunity of stakeholders to participate in the project shaping in a continuous fashion, and (vii) the delivery of a tool for the implementation team to evaluate and challenge changes to the project during construction. The usage of this methodology does not guarantee the avoidance of errors or unforeseen project outcomes, but it does reduce the chance for unknown risks emerging from the interactions of the evaluated features.
by César Alberto Cornejo Gómez.
S.M. in Engineering and Management
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Erol, Umit Levent. "DEVELOPMENT OF A LOWER EXTREMITY EXOSKELETON POWER UNIT." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1619385500249639.
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Chard, Simon Peter. "Development of versatile high power bounce geometry lasers." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6184.
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This thesis details an investigation into the development of bounce geometry lasers to achieve a more versatile range of laser characteristics. The bounce geometry has matured in recent years into a useful solid-state pumping scheme, but its performance has to date been limited by a number of factors, as well as largely restricted to neodymium systems. For real-world application, a more versatile range of laser characteristics would be desirable. A new design for a bounce geometry amplifier is presented that achieves a symmetric gain profile and thermal lens by control of the amplifier dimensions. The laser produces a circular stigmatic TEM00 (M2 < 1:11) beam with 14 W power. When Q-switched, the design permits versatile control over the repetition rate (single-shot to 480 kHz) with pulse energies up to 0.45 mJ. The stigmatic design also allows the direct generation of a Laguerre-Gaussian `vortex' beam, and proves favourable for modelocking with the nonlinear mirror method. Several designs are investigated to study power scaling in a master oscillator power amplifier (MOPA) configuration, including a stigmatic MOPA based on the amplifier described above, and a chain of multiple power amplifiers. A folded dual-pumped amplifier design is also demonstrated, which reduces the size and complexity of a multi-stage amplifier and allows power scaling to the 100 W level. Pulse amplification is also investigated, and a MOPA is optimised for energy extraction by a Q-switched oscillator. Finally a 3-micron bounce laser is presented using an erbium-doped YSGG gain medium. Different cavity designs are investigated, and a simple compact cavity is found to be optimum. Thermal effects are investigated and found to be a limiting factor on the laser's performance. Quasi-continuous wave pulse energies of up to 15 mJ are demonstrated, with an average power of up to 430 mW.
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Adams, Barbara Miller. "Owning professional development the power of teacher research /." [Ames, Iowa : Iowa State University], 2009.
Find full text
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Wu, Guo-Jung, and 吳國榮. "Development of Electronic Power Meters with Reactive Power Measurement." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/ve6mv4.
Full textAbstract:
碩士國立臺北科技大學
自動化科技研究所
102
Due to global warming and shortage of energy, the idea of saving energy gradually attracts public’s attention. How to use and save energy efficiently has become an issue worthy of discussion. Therefore, to change the habit of using resources every day, the key is obtain the data usage of these resources first before it can be improved. Advanced Metering Infrastructure (Advanced Metering Infrastructure, AMI) in this case plays a crucial role, and "Intelligent Power meter" is the core to establish "advanced metering system". This paper utilizes MSP430AFE253 processor as the core element for the development of electronic watt-hour meters. This MCU is specifically designed for single-phase electronic watt-hour meters. It has internal analog front-end circuit that can handle AC signals. The MCU has three 24-bit delta-sigma ADCs that is capable of acquiring single-phase voltages and currents simultaneously and it has an additional PGA (Programmable Gain Amplifier) function. The MCU calculates the necessary information, such as Vrms, Irms, KW, KVAR, KVA, PF, etc. after the signals are acquired. In addition, the development of electronic watt-hour meters have communication capabilities. Such functions help to send the data on electric consumption from users back to control center and meter calibration procedures, making electronic digital meter meets the standard error range. If the Intelligent Power Meters provide reactive power information, users can then improve the power factor of the load, reducing line losses. Therefore, this paper uses digital Finite Impulse Response filter (Finite Impulse Response, FIR), response filter (First-FIR, filter) and the translation method through a first-order finite impulse to complete the reactive power calculations.
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Huang, Chung-che, and 黃崇哲. "Development of Power Converters for Small Wind Power Systems." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/95723632840281483211.
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碩士國立臺灣科技大學
電機工程系
98
This thesis presents the analysis and design of power converters for wind generators. The system can transfer the generator power from varying-voltage and varying-frequency to 60 Hz single-phase source. The system uses ac-dc power converter to serve as the generator side power converter. When the wind speed is low, the ac-dc power converter uses cascade boost structure to raise the dc-link voltage. When the wind speed is nominal, the ac-dc power converter uses boost structure. Whereas, when the wind speed is high, the ac-dc power converter uses full-bridge rectifiers to keep dc-link voltage lying within the constant range. A buck/boost dc chopper is designed to charge and discharge batteries in order to regulate the power flow between renewable energy and system loads so that it can supply stable dc power to system loads. The single-phase full-bridge inverter designed can not only control the output voltage but also operate in either stand-alone or grid-connected fashion. A high-performance and low-cost digital signal processor TMS320F2808 is used to implement the control function to control the power converters. An experimental system is built. The system can provide single-phase AC 110V to single-phase load under stand-alone operation mode. The output of the effective power is 345W. Under grid-connected mode, the power converter supplies 235W with the corresponding efficiency of 79.6% using cascade boost topology. Finally, experimental results are given to justify the analysis.
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Pan, Yu-hsin, and 潘郁昕. "Development of Power Converters for Solar Power Conversion Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/91398572127818786305.
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碩士國立臺灣科技大學
電機工程系
97
This thesis presents the development of a solar power generating system. The solar-cell system uses boosted dc-dc power converter and maximum power point tracking. They are designed to enhance conversion efficiency and achieve high power output. It can be applied to different solar-cell systems by different voltages with two parallel dc-dc converters. Using perturbation and observation method, a maximum power point tracking controller, the solar-cell can achieve maximum power control in accordance with illumination. The single phase full-bridge dc-ac converter uses unipolar voltage switching method on power grid side. It can convert dc-source to single-phase current output with constant voltage and constant frequency. This system can receive feedback voltage to adjust output voltage. It can keep output voltage constant under load is variation. In current mode, it can support stable single phase current and connect with power grid. In this thesis, a high-performance, low-cost digital signal processor TMS320LF2812 is used to implement the system for reducing the circuit components and cost. A prototype of 800W hybrid power conversion system is developed. The system can feed proper power to the grid in grid-connected operation. While for stand-alone operation, the rated output voltage is 110V and the frequency is 60 Hz. The efficiency of the whole system in grid-connected operation reaches 91%. The range of solar-cell voltage is between 100~180V. Experimental results are given to verify the proposed system.
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洪若馨. "Development of a Simple Power Failure Retraction Development of a Simple Power Failure Retraction." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/09964010298511683716.
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碩士國立彰化師範大學
電機工程學系
100
In this thesis, a simple power-failure retraction equipment for cylindrical grinding machines is developed. It can make the grinding wheel be able to retract while the main power supply is failed for avoiding over-grinding the workpiece. Conventionally, an uninterrupted power system (UPS) is used to ensure the retraction of the grinding wheel. However, it will cost a lot because of the large power capacity requirement, up to tens of kVA. From the experimental results, it can be seen that by adopting proper capacitors the proposed simple equipment can provide more than 0.3mm retraction while the main power is failed. As a result, the proposed simple mechanism can be used to replace the large UPS and reduce 97.27% cost.
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Wei-Chih, Yeh. "Development of Broadband Power Amplifiers." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1701200714161800.
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Yeh, Wei-Chih, and 葉威志. "Development of Broadband Power Amplifiers." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/84758192239282289005.
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碩士國立臺灣大學
電子工程學研究所
95
According to some researches, no matter in the time domain or in the spatial domain, that the usage of spectrum with utilization ranging from 15% to 85% in the bands below 3 GHz. At frequency above 3 GHz the actual utilization is dramatically lower. The FCC has issued the Cognitive Radio System, this system can improve the utilization of spectrum without interfere with the users who have primary rights to use the spectrum by sensing and changing the transmitted band. In order to transmit signal in multiple frequency bands, there should be a broadband power amplifier in transmitter to adapt to this system. Circuit design and theory of RF power amplifier are the main research points of this thesis. We analyze some kinds of broadband power amplifier technique and finally we decided to design broadband power amplifier with network synthesis broadband matching. We use WIN GaAs PHEMT 0.15μm process to design broadband power amplifier. We cascade two common source amplifiers, and all matching networks are integrated into single chip. Operation frequency of this power amplifier is from 3GHz to 7.5GHz, power gain is from 19.6dB to 21.6dB, output P1dB is from 21.5dBm to 22.9dBm and PAE is from 19.5% to 29.5%.
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HU, JHIH-HUEI, and 胡智惠. "Development of solar power system." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2yyqhu.
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碩士聖約翰科技大學
電機工程系碩士在職專班
106
Electric energy is an important basis for the economic development of a country. It is also an essential energy source of human life. Effective use of solar power can prevent the waste of power resource and increase power supply quality. In micro-grids, accurate photovoltaic prediction has many benefits, like providing proper power scheduling, reducing operating costs even improving power supply reliability. The traditional solar photovoltaic forecasting method designs the prediction model by environmental information and solar photovoltaic module information. The relationship between these two data and the photovoltaic power generation amount is nonlinear. The traditional method is difficult to solve the nonlinear problems. This paper confirms the relationship between input parameters and output generation amount. By the correlation coefficients in the statistics, the relative influence of each parameter can be obtained. In the proposed forecast method, illumination is considered as one of the forecast data. However, if the illumination changes greatly, the fluctuation of power generation and the prediction error will greatly increase.
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Liang, Zhong-Chen, and 梁宗正. "Development of Power Converter for Fuel Cell Power Conversion Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/89101798865127636914.
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碩士國立臺灣科技大學
電機工程系
97
This thesis is concerned with the analysis and implementation of parallel full-bridge dc-dc power converter and single-phase full-bridge dc-ac power converter. The full-bridge dc-dc power converter operates under voltage feedback control mode by using phase-shift control to convert fuel cell voltage source to high voltage. Under the full-bridge dc-dc power converters of parallel operations, using current-sharing strategies will increase capacity and utilization rate of the systems and accomplish load-sharing. The master-slave control technique is used in order to increase the reliability of the system. To achieve low harmonic distortion and fast response, the single-phase full-bridge power converter adopts sinusoidal pulse-width modulation (SPWM) unipolar switching technique. The single-phase full-bridge power converter can provide constant and stable output voltage under load variation by using amplitude-locked loop algorithm of voltage-controlled mode, and stable single-phase current to power grid under current-controlled mode. In this system, a high-speed, low-cost digital signal processor TMS320LF2812 is used to host the control system. The voltage and current control rules are realized by software. It can not only reduce the hardware cost but also improve the system reliability. The experimental results with linear load of 600 W show that the single-phase output voltage is 110 V, 60 Hz. The total harmonic distortion of output voltage is 4.67 %, the efficiency of the system reaches 80 %. Besides, the system can feed real power to the grid in grid-connected operation. Experimental results are given to justify the analysis.
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Ji, Hong, and 季宏. "Development and Application of the High Power Planetary Power Generator." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/24698828914753109009.
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碩士崑山科技大學
光電工程研究所
99
The size of the output voltage of traditional power generators depend on the magnetic flux changes in the induction coil over an amount of time, so in order to increase the output voltage one needs to increase the size of the magnetic field, the number of induction coils, add silicon steels, and install gear boxes..etc. However, these methods will cause the rotor weight to increase, resulting in a magnetic pull, thereby increasing the generator bearing load which makes the rotor harder to run, making it a bad choice to use clean energy as its driving source. Therefore how to improve traditional power generating devices is the purpose of this research. This thesis report introduces a newly developed “Planet Style Power Generator”, and applies this generator on a variety of devices. Based on actual testing results using the device on HPEG, the maximum output of the developed HPEG can reach 300W, with the output current being 1.2~1.3A. Using the device on an emergency back up power generator, the maximum output power could reach up to 46W, with a maximum output current of 0.38A.Used on Planetary axial flux a single-phase AC power permanent magnet generator, the greatest successful output is about 410W when the rotating speed reaches the maximum 200 rpm.
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Floyd, Michael Cameron Dawley. "Development of Ferromagnetic Metallic Glasses into Low Loss Power Transformer Cores." Thesis, 2018. https://thesis.library.caltech.edu/10546/13/development-ferromagnetic-metallic.pdf.
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Currently, 3% of energy losses in the U.S. electrical grid occur at power transformers. With a transition to Metglas, transformer efficiency could be increased, but is Metglas the best replacement material for power transformers?
With this in mind we develop a Fe-based metallic glass for its glass forming ability and soft magnetic properties. During this development we identify a redox reaction of boron oxide by Si during melt fluxing of the Fe-based glass, which promotes an unexpected exchange of Si and B in the alloy. Taking this reaction into account, a unique optimization strategy is implemented, enabling oxide purification of the melt coupled with a significant but predictable shift in composition. This leads to an optimized Fe-based glass demonstrating a global peak in glass forming ability. Following boron oxide fluxing in the high temperature melt, alloy with composition Fe57.5Co20.2Si10.2B2.05P10.05 transforms to Fe57Co19.2Si6.8B7.4P9.6, and increases its critical rod diameter from 1 mm to 5 mm. The alloy also demonstrates excellent soft ferromagnetic performance characterized by a magnetic saturation of 1.53 T.
While developing the above alloy, we also analyzed the effect of varying thickness of a Fe68Mo4Ni3Co5Si1P11.5C5B2.5 transformer core as a function of frequency to discover if there was a minimum in the losses. We did not find a single minimum, but found that the optimal thickness exhibits a logarithmic dependency on frequency. This dependence suggests the optimal thickness of a core ranges from 100−400μm, instead of in the < 50μm range currently used. These larger optimal thicknesses are unexpected if anomalous losses are not considered, but the dominance of the anomalous losses at low frequencies, or for thin samples, validates the need for thicker power transformers. While other amorphous metals and casting techniques will yield varying results, the logarithmic dependence on frequency and the 100−400μm optimal thickness range should be broadly applicable.
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zhan, zhi-sheng, and 詹志勝. "Development of A Power Harmonic Analyzer." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/99217548280232977560.
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碩士國立臺灣科技大學
電機工程系
98
The goal of this thesis is to design and implement a power analyzer, in which practicality, immunity and precision are under considered. A high-performance digital-signal-processor (DSP) is employed as the core of the analyzer which provides real-time calculation for all available measurement functions. Three channels of voltage and three channels of current are sensered through the potential transformers (PT) and current transformers (CT) and are converted by six individual angalog-to-digital converters, which provides 16-bit resolution. An averaging procession is used to obtain precise results. For each input channel, four cycles of the signal are obtained from 1024 data points and the Hanning window is used to implement haracterization on the spectrum for avoiding spectral leakage. Some special instructions are used to execute the complex fast Fourier transform for analyzing the measured signals. Finally, all available sesults are sent to a seperated digital processor for display or futher processing.
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LIN, Jun-Tsun, and 林俊村. "Development of a Hybrid Power Scooter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/39626634841271382270.
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碩士國立屏東科技大學
車輛工程系所
95
This thesis is aimed to develop an ICE-electric hybrid-power scooter which uses a 900W hub motor to provide a small rate of assistant power to a scooter originally equipped with a 125cc fuel injection ICE. The work is divided into two parts, namely, hardware design and software design. For the work of hardware design, a X-by-wire throttle valve, a generator mount mechanism, a hub mount mechanism, and the circuits for control of all the subsystem were design and implemented under the constraints of the physical space of the scooter. As to the work of the software design, a lookup table based as well as a fuzzy logic energy management strategy have been proposed. Performance evaluation experiments have been carried out the developed system under a series of road tests. The test results show that the designed system can lower a fuel consumption rate of 40% with the battery SOC staying above 70%.
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Chang, Tse-Yung, and 張澤湧. "Development of Power-Assisted Transport Wheelchair." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/73538796463201921348.
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碩士國立陽明大學
物理治療暨輔助科技學系
101
Wheelchairs are very helpful for people who have brain, nerves and degenerative disease or lower limb disorders. Among these groups, most of them can’t control wheelchairs or electric ones, as a result, they need caregivers’ help to handle them. Furthermore, because of the general type wheelchairs are unpowered, the caregivers have to overcome the long-distance walk or the rough roads, and therefore causes inconvenience or difficulty. In addition, with advances in technology, population ageing and the low birth rate is expected to lead to a burgeoning demand for aged care services. In consequence, it is important to provide power-assisted wheelchairs. The development of electric powered wheelchairs has gradually progressed, and there are many functional electric powered wheelchairs on the market. Most electric powered wheelchairs’ use is designed for disabled users themselves, and not for the caregivers’ assistance. Although some control interfaces design for caregivers, the settings of them are not suited for them. The specific aim of this study is to design a power-assisted wheelchair for caregivers. This device can be easily controlled without learning. It can be used in a variety of contexts (asphalt, grass, uphill, downhill, outdoor environment) without wearing any sensors. In this study, we detected the location of the caregiver to control the wheelchair to move forward and backward. The results showed that the distance between the caregiver and power assisted wheelchair maintained at 45-65 cm when moving forward while 60-80 cm were observed when moving backward. In addition, without the use of our device, the thrust test in a variety of contexts (asphalt, grass, uphill, downhill, outdoor environment) was significantly lower. The support test showed that the device can provide 180 to 200N support when the users were in need of help. Only by understanding the users' actual usage can we improve the actual test. In the near future, the improvement of the power-assisted wheelchair might be advantage to the caregivers.
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Tsai, Chin-Wei, and 蔡智偉. "Development of RF CMOS Power Amplifier." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/r8aca6.
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碩士國立臺北科技大學
自動化科技研究所
94
This thesis presents the development of RF CMOS power amplifier which is implemented by UMC CMOS 0.18-um 1P6M process. A class E power amplifier and a cascode power amplifier are designed to be used in bluetooth system and wireless sensor network system, respectively. In the matching network design, the input matching network is designed for maximum gain transducer by conjugate matching and the output matching is designed for maximum power transducer by load-pull matching. The simulation results of class E power amplifier whose input matching network and output matching network are on the chip and off the chip respectively are output power of 21.214dBm, PAE of 37.765％ and power gain of 17.214dB at 2.4GHz. And the cascade power amplifier which is a fully chip realized an overall PAE of 20% with output power of 3.583dBm and had power gain of 7.583dB at 2.4GHz. In general, the effect of layout is not considered in the simulation of circuit level. This thesis considers the parasitic effect after layout to obtain more accurate results of simulation.
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Lin, Jhan-Jia, and 林斬嘉. "Development of Solar Light Power Estimator." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/bf33na.
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碩士國立虎尾科技大學
電機工程研究所
101
This thesis uses five photo diodes as sunlight detectors to implement sunlight measurement system, the photo diodes are located on five facets which on the front, rear, left, right and horizontal, individually, of constituting a light measuring sensor and the associate azimuth angle and altitude angle can be found throughout perpetual calendar. Direct Solar Radiation of each sunlight detector can be estimated by the equation derived from the minimum angle of incidence. Sunlight measurement system in this thesis is placed horizontally to detect the optical power from all detectors, by using principle of vectors geometrical space and coordinate transformation to indicate the real time solar power. By comparing the differences between measurement results and experimental results, both theory of value and actual value are consistency, therefore, the proposed solar light sensor system is capable to measure precisely.
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Chang, Feng-Ying, and 張豐瀅. "Development of Solar Light Power Detector." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/6j284s.
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碩士國立虎尾科技大學
電機工程研究所
101
In this thesis, the photo diode detectors are used to realize the solar light sensor for measuring the relative solar orientations and solar energy. The sunlight measurement detector in this study is the combination of the conical sensor and the cubic sensor, delicately designed to measure the light energy. Accordingly, the photo detectors located on five facets can detect solar light from various directions and measure the incident solar energy. Based on the geometric space transformation principle, the relationship equation between measured power of various-facet detectors and solar lighting source can be conducted. The solar power can be precisely extrapolated without using any electronic compass and extra orientation angle corrector.