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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Portion Control: An Examination of Organizational Control and Male Athlete Eating Disorders

Lever, Katie 01 April 2018 (has links)
Eating disorders (EDs) are strikingly common among American adults. Past research has indicated that athletes in general are particularly vulnerable to developing EDs due to media pressure, athletic drive, and the population’s proclivity to perfectionism. Most ED research, both in athletic and non-athletic populations, is female-focused, as women are more likely to develop EDs. However, men are still susceptible to develop EDs and are understudied. Links between lack of autonomy and EDs exist in familial settings, but have yet to be applied in organizational settings. This quantitative thesis sought to bridge a research gap by assessing ED levels in male NCAA Division 1 athletes and examining the relationships with perceived levels of concertive, institutional, and simple control present in athletic settings. Findings indicated that although athletes perceived different forms of control in their sport, these forms of control did not negatively affect their eating habits. Implications and direction for future research are explored.
2

Flyback photovoltaic micro-inverter with a low cost and simple digital-analog control scheme

Yaqoob, S.J., Obed, A., Zubo, R., Al-Yasir, Yasir I.A., Fadhel, H., Mokryani, Geev, Abd-Alhameed, Raed 04 August 2021 (has links)
Yes / The single-stage flyback Photovoltaic (PV) micro-inverter is considered as a simple and small in size topology but requires expensive digital microcontrollers such as Field-Programmable Gate Array (FPGA) or Digital Signal Processor (DSP) to increase the system efficiency, this would increase the cost of the overall system. To solve this problem, based on a single-stage flyback structure, this paper proposed a low cost and simple analog-digital control scheme. This control scheme is implemented using a low cost ATMega microcontroller built in the Arduino Uno board and some analog operational amplifiers. First, the single-stage flyback topology is analyzed theoretically and then the design consideration is obtained. Second, a 120 W prototype was developed in the laboratory to validate the proposed control. To prove the effectiveness of this control, we compared the cost price, overall system efficiency, and THD values of the proposed results with the results obtained by the literature. So, a low system component, single power stage, cheap control scheme, and decent efficiency are achieved by the proposed system. Finally, the experimental results present that the proposed system has a maximum efficiency of 91%, with good values of the total harmonic distortion (THD) compared to the results of other authors / This work was supported in-part by Innovate UK GCRF Energy Catalyst PiCREST project under Grant number 41358, in-part by British Academy GCRF COMPENSE project under Grant GCRFNGR3\1541

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