Typescript, etc. / Digitized by Kansas State University Libraries

Inaug.-dis.--Jena. / Lebensabriss.

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He, Zhengjun. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2009. / Includes bibliographical references (leaves 125-129). / Abstracts in English and Chinese. / ABSTRACT --- p.i / ACKNOWLEDGEMENTS --- p.iv / TABLE OF CONTENTS --- p.v / LIST OF FIGURES --- p.vii / LIST OF TABLES --- p.xi / NOMENCLATURE --- p.xii / Chapter Chapter 1 --- INTRODUCTION --- p.1 / Chapter 1.1 --- Issues and problems --- p.2 / Chapter 1.2 --- Objectives --- p.3 / Chapter 1.3 --- Methodology --- p.3 / Chapter 1.4 --- Significance and benefits --- p.5 / Chapter 1.5 --- Organization of the thesis --- p.5 / Chapter Chapter 2 --- BACKGROUND AND LITERATURE --- p.7 / Chapter 2.1 --- Introduction --- p.7 / Chapter 2.2 --- Daylight data measurement --- p.7 / Chapter 2.3 --- Satellite-based models to derive illuminance --- p.9 / Chapter 2.3.1 --- Irradiance derived from satellite pixel values to illuminance (indirect approaches) --- p.9 / Chapter 2.3.1.1 --- Heliosat algorithms --- p.10 / Chapter 2.3.1.2 --- Perez et al. model --- p.20 / Chapter 2.3.1.3 --- Uetani model --- p.24 / Chapter 2.3.1.4 --- Gautier et al. model --- p.25 / Chapter 2.3.1.5 --- Janjai et al. model --- p.27 / Chapter 2.3.1.6 --- Comparison of different models --- p.28 / Chapter 2.3.1.7 --- Irradiance to illuminance using luminous efficacy models --- p.31 / Chapter 2.3.2 --- Satellite pixel values to illuminance (direct approaches) --- p.34 / Chapter 2.4 --- CIE standard skies --- p.37 / Chapter 2.5 --- Sky luminance distribution and sky types prediction using meteorological data --- p.40 / Chapter 2.6 --- Sky types and sky luminance distribution prediction using satellite images --- p.48 / Chapter 2.7 --- The needs for deriving daylight data from satellite images in Subtropical southern China --- p.51 / Chapter 2.8 --- General climate information of Hong Kong --- p.52 / Chapter Chapter 3 --- USING SATELLITE-BASED METHODS TO PREDICT DAYLIGHT ILLUMINANCE --- p.55 / Chapter 3.1 --- Introduction --- p.55 / Chapter 3.2 --- Data --- p.56 / Chapter 3.3 --- Methodology --- p.62 / Chapter 3.3.1 --- Satellite pixel value to cloud index --- p.63 / Chapter 3.3.2 --- Cloud index to global illuminance: indirect approach --- p.69 / Chapter 3.3.2.1 --- Cloud index to global irradiance --- p.69 / Chapter 3.3.2.2 --- Global irradiance to global illuminance --- p.73 / Chapter 3.3.3 --- Cloud index to global illuminance: direct approach --- p.75 / Chapter 3.4 --- Model precision and results --- p.79 / Chapter 3.4.1 --- Irradiance model precision --- p.79 / Chapter 3.4.2 --- Illuminance models precision --- p.80 / Chapter 3.4.3 --- Model performance under different seasons --- p.85 / Chapter 3.5 --- Conclusions --- p.87 / Chapter Chapter 4 --- USING SATELLITE-BASED METHOD TO PREDICT SKY TYPES --- p.89 / Chapter 4.1 --- Introduction --- p.89 / Chapter 4.2 --- Data --- p.90 / Chapter 4.3 --- CIE Standard General Sky --- p.92 / Chapter 4.4 --- Sky type prediction --- p.93 / Chapter 4.4.1 --- Sample data --- p.93 / Chapter 4.4.2 --- Assessment of other approaches --- p.97 / Chapter 4.4.3 --- Formulation of a method to predict sky conditions under subtropical context --- p.101 / Chapter 4.5 --- Model precision and results --- p.105 / Chapter 4.6 --- Conclusions --- p.116 / Chapter Chapter 5 --- CONCLUSION --- p.117 / Chapter 5.1 --- Research summary --- p.117 / Chapter 5.1.1 --- The indirect approach to derive global illuminance --- p.117 / Chapter 5.1.2 --- The direct approach to derive global illuminance --- p.118 / Chapter 5.1.3 --- Sky types prediction --- p.118 / Chapter 5.2 --- Conclusion and discussion --- p.119 / Chapter 5.3 --- Research contributions and limitations --- p.122 / Chapter 5.4 --- Needs for further research --- p.123 / BIBLIOGRAPHY / APPENDIX

Thèse : Physique : Paris, Faculté des sciences : 1840. / Titre provenant de l'écran-titre. Références bibliogr.

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It was stated in the introduction that the purpose of this project was to design and construct a sunlight integrator which would have wide intensity range, reliability under normal operating conditions, and moderate cost. If the minimum sensitivity for the first filter is arbitrarily chosen as one-tenth the dark counting period, which is in excess of three hundred seconds, the minimum detectable light intensity would be: .00858/30 = .000286 lumen per cm². This is equivalent to an intensity of .256 foot-candle for a 30 second counting period. / Master of Science

The purpose of this thesis is to consider PhotoVoltaic Power Converter (PVPC) technology, developed by Atira Technologiesʼ, and its prospects for military and space applications. This research will validate the hypothesis that PVPC technology enables a solar power system to produce usable power during low- and no-light conditions which standard solar power systems fail to provide. Solar cell panels are exposed to sunlight at different angles and with variable intensity, therefore the resulting output power varies depending on the illumination angle as well as the light intensity of each panel. Atira Technologiesʼ devised a novel buck-boost converter that is specifically designed to track the maximum power point of each solar panel. This would provide a significant increase in the overall available power by utilizing a switching topology in a subdued lighting condition. Although a small amount of power is generated, given enough time, a battery will reach its full charge, compared to no additional charging if the battery is using a panel without the circuit. In addition, this research will also show the vital sustaining information to substantiate PVPC's claim of usefulness and effectiveness to allow for longer time on station both in the field and in space so it can extend its missions.

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Abstract The Act on Property-Declaration by Public Servants of the Sunshine Laws is the first legislation of a series of Sunshine Laws. In order to maintain an upright political atmosphere and ensure non-corruptive official conducts, an overall planning for the Sunshine Laws is imminent and inevitable. An entry level perspective is taken in this research to examine the opinions of the government employees and school staffs of Penghu County towards the property declaration system in Taiwan. The results are obtained through in-depth interviews and qualitative data analysis by the ATLAS.ti software and derived based on the grounded theory. The awareness, attitude, opinions and suggestions of the interviewees are collected and analyzed according to the aspects of regulation, system and implementation. Since the promulgation of the ¡§Act on Property-Declaration by Public Servants¡¨, one of the first legislations of the Sunshine Laws, it has experienced 15 years of challenges. Despite the likelihood that the enforcement may have achieved the intended political effects, generations of environmental changes have induced diverse problems which are observed in literature reviews and interviews conducted on public servants who have declared their properties. These problems may appear to be non-relevant; however, they impose great difficulty for achieving the vision of righteous and justice. It is expected that these problems will help encourage clean and upright official conducts and uphold a righteous political atmosphere. The existing problems may only be a corner of the iceberg; however, when the situation is extended to the overall system, a similar scenario may occur once a set of comprehensive Sunshine Laws are to be stipulated. As a result, strategies for amending the current or future regulation on the property declaration system should be developed. Based on the above analysis and discussion, the following conclusions are proposed: 1. Regulation aspect: (i) Reinforce a comprehensive property declaration. (ii) Establish a definitive declaration scope and content. (iii) It is imminent and inevitable that a comprehensive set of Sunshine Laws should be stipulated. (iv) Accentuate on the law-obeying attitude. 2. Institution aspect: (i) Reinforce an open and transparent processing procedure. (ii) Set a definitive deadline that all properties should be declared within one month of employment or taking office. (iii) Establish a property declaration system based on ¡§administrative penalty¡¨. (iv) Promote the legislation of ¡§Trust Law¡¨ and ¡§Trust Companies Law¡¨. 3. Implementation aspect: (i) Increase the percentage of sampling. (ii) Maintain the integrity of the ¡§Sunshine Laws¡¨, form an ¡§incorrupt and capable government¡¨. (iii) Ensure the function of examination and inspection. (iv) Reinforce the task of education and promotion.