Thesis (Ph. D.)--University of Hong Kong, 1998. / Includes bibliographical references (leaves 191-200).

<p>U okviru ove&nbsp; disertacije razvijena je i&nbsp; verifikovana metoda&nbsp; za&nbsp; direktno&nbsp; merenje&nbsp; koncentracije&nbsp; toronovih&nbsp; potomaka&nbsp; u vazduhu&nbsp; i&nbsp; određivanje&nbsp; toronske&nbsp; ravnoteže.&nbsp; Pouzdanost&nbsp; i primenljivost&nbsp; predloženog&nbsp; GAMA&nbsp; metoda&nbsp; proverena&nbsp; je sveobuhvatnom&nbsp; studijom&nbsp; koncentracija&nbsp; radona,&nbsp; torona&nbsp; i svih parametara koji doprinose ovim koncentracijama na 16 različitih&nbsp; lokacija&nbsp; na&nbsp; području&nbsp; Srbije&nbsp; odabranih&nbsp; na&nbsp; osnovu<br />geomorfologije&nbsp; terena&nbsp; i&nbsp; prethodnih&nbsp; merenja.&nbsp; Iznalaženjem najznačajnijih&nbsp; statističkih&nbsp; korelacija&nbsp; i&nbsp; primenom&nbsp; jedne&nbsp; od predloženih&nbsp; metoda&nbsp; iz&nbsp; kori&scaron;ćene&nbsp; naučne&nbsp; literature&nbsp; za procenu&nbsp; geogenog&nbsp; radonskog&nbsp; potencijala&nbsp; identifikovani&nbsp; su prediktori&nbsp; koji&nbsp; utiču&nbsp; na&nbsp; koncentraciju&nbsp; radona&nbsp; u&nbsp; zemlji&scaron;tu i vazduhu zatvorenih prostorija. Pored toga studijom slučaja u&nbsp; jednoj&nbsp; porodičnoj&nbsp; kući&nbsp; potvrđena&nbsp; je&nbsp; primenljivost&nbsp; i podobnost&nbsp; aktivnih&nbsp; monitora&nbsp; za&nbsp; određivanje&nbsp; radonske&nbsp; i toronske&nbsp; ravnoteže,&nbsp; praćenje&nbsp; varijacija,&nbsp; kao&nbsp; i&nbsp; neophodnost njihove&nbsp; primene&nbsp; u&nbsp; procesu&nbsp; remedijacije&nbsp; objekata&nbsp; sa<br />povi&scaron;enom koncentracijom radona.</p> / <p>Within&nbsp; this&nbsp; dissertation,&nbsp; a&nbsp; method&nbsp; for&nbsp; the&nbsp; direct measurement of indoor thoron progeny concentrations and&nbsp; determination&nbsp; of&nbsp; the&nbsp; thoron&nbsp; equilibrium&nbsp; was developed&nbsp; and&nbsp; verified.&nbsp; The&nbsp; reliability&nbsp; and applicability&nbsp; of&nbsp; the&nbsp; proposed&nbsp; GAMA&nbsp; method&nbsp; was proved by a comprehensive study of radon, thoron and all parameters that contribute to these concentrations at 16 different locations in the territory of Serbia selected based&nbsp; on&nbsp; geomorphology&nbsp; of&nbsp; the&nbsp; terrain&nbsp; and&nbsp; previous measurements. Based on the most significant statistical correlations&nbsp; between&nbsp; all&nbsp; examined&nbsp; parameters&nbsp; and using one of the proposed methods from the literature<br />geogenic&nbsp; radon&nbsp; potential&nbsp; was&nbsp; estimated&nbsp; with identification&nbsp; of&nbsp; the&nbsp; predictors&nbsp; which&nbsp; significantly affect radon concentrations in air and soil. In addition, a&nbsp; case&nbsp; study&nbsp; in&nbsp; one&nbsp; family&nbsp; house&nbsp; confirmed&nbsp; the suitability&nbsp; of&nbsp; active&nbsp; radon&nbsp; monitors&nbsp; for&nbsp; determination of&nbsp; the&nbsp; radon&nbsp; and&nbsp; thoron&nbsp; equilibrium,&nbsp; monitoring&nbsp; of time&nbsp; variations&nbsp; and&nbsp; also&nbsp; the&nbsp; necessity&nbsp; of&nbsp; their application in the remediation of objects with elevated radon.</p>

The aim of the thesis is to valuate economic effectivity of radon mitigation countermeasures co-financed by the state applied in family houses which display high radon level. Feasibility of the mitigation is analysed without concering financing source. Furthermore, the project is valuated from the point of view of the house owner and from the state's point of view. Presence of residental radon is increasing lung cancer probability, radon has notable healt effects. Costs and benefit of the hypothetic project are vauated in CBA analysis. The author finds the project unfeasible. CBA is discussed as a suitable economic tool for fiding alternative technological method aiming to social effectivity. Providing feasible change of remediation parametres caused positive social value of the project, socioeconomic flow in the state point of view would remain negative. Therefore, state participation on the radon mitigation countermeasures of private family houses is not reccomended.

No description available.

Radon is a radioactive gas that is the leading cause of lung cancer in non-smokers. While radon is natural and ubiquitous, higher concentrations greatly increase cancer risk. As such, understanding the spatial distribution of radon potential is key to planning and public health efforts. This project tests a method of determining radon potential using in situ measurements of gamma radiation. The in situ measurements were used to create a raster of gamma emissions in the study region using kriging. The resulting model showed that the operational scale of gamma radiation in the study region was 4.5 km. Indoor radon concentrations were then assigned gamma emission rates from the raster and the two were compared. While there was evidence of an association between higher gamma and high radon, the gamma readings were not quantitatively predictive. As such only categorical predictions of radon potential and risk could be made.

Radon gas may be a major air quality hazard issue inside the home. Radon (222Rn) comes from the natural breakdown of radioactive uranium (238U) via radium (226Ra) in soil, rocks, and water. Radon and its progeny contribute more than 50% of the total radiation dose to the human population due to inhalation; it can result in severe and fatal lung disease. This investigation has determined the radon concentrations in seventy-seven domestic houses in a mountainous area of Hamadan in Iran which were monitored using track-etch detectors of type CR-39 exposed for three month periods. The arithmetic mean radon concentration in Hamadan buildings was determined to be 80 Bqm-3 and also an average indoor annual effective dose equivalent for the Hamadan city population was calculated as 1.5 mSv. Maximum radon concentrations were noted during the winter and spring season. In addition to this, 28 water wells were monitored by utilizing a Sarad Doseman detector at hourly intervals over extended periods. Radon measurements were also carried out in the nearby Alisadr show cave, using Solid State Nuclear Track etch Detectors (SSNTDs) during the winter and the spring periods. In the cave, the average annual effective geometric and arithmetic mean dose for guides was 28.1 and 34.2 mSv respectively. The dose received by visitors was very low. Hamadan city is built on alluvial fan deposits which are the source of the local water supply. The data from the wells shows that the groundwater in these alluvial deposits influences the flux of radon. The atmospheric radon concentration measurement in wells above the water surface ranged from 1,000 Bqm-3 to 36,600 Bqm-3. There is evidence that radon-rich ground waters play a significant role in the transport of radon through the alluvial fan system. There is evidence that the radon concentrations in homes in Hamadan are greatly influenced by the porous nature of the underlying geology and the movement of groundwater within the alluvial fan.

Chun, Chun Nam. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2003. / Includes bibliographical references (leaves 73-75). / Abstracts in English and Chinese. / ABSTRACT --- p.i / 摘要 --- p.ii / ACKNOWLEDGEMENTS --- p.iii / TABLE OF CONTENTS --- p.iv / LIST OF FIGURES --- p.v / LIST OF TABLES --- p.vii / Chapter 1 --- INTRODUCTION --- p.01 / Chapter 1.1 --- Iris Texture as A Biometric Password --- p.01 / Chapter 1.1.1 --- Advantages --- p.02 / Chapter 1.1.2 --- Previous Work --- p.04 / Chapter 1.1.3 --- Operation Procedures --- p.06 / Chapter 1.1.3.1 --- Image Acquisition --- p.07 / Chapter 1.1.3.2 --- Iris Localization --- p.07 / Chapter 1.1.3.3 --- Image Encoding and Database Matching --- p.08 / Chapter 1.2 --- Motivation and Research Objective --- p.09 / Chapter 1.3 --- Thesis Outline --- p.11 / Chapter 2 --- IMAGE ACQUISITION --- p.13 / Chapter 2.1 --- Difficulties on Image Acquisition --- p.13 / Chapter 2.2 --- Our Iris Image Acquisition Setting --- p.13 / Chapter 3 --- PRE-PROCESSING --- p.15 / Chapter 3.1 --- Isolating the Region of Interest --- p.15 / Chapter 3.1.1 --- Conscious and Unconscious Recognition --- p.15 / Chapter 3.1.2 --- Iris Boundary Detection --- p.16 / Chapter 3.2 --- Iris-ring Unfolding and Normalization --- p.19 / Chapter 3.2.1 --- Eccentric-polar Coordinate System --- p.20 / Chapter 3.2.2 --- Iris-ring Unfolding --- p.22 / Chapter 3.2.3 --- Normalization --- p.22 / Chapter 3.3 --- Data Binarization --- p.24 / Chapter 4 --- RADON TRANSFORM BASED ENCODING AND MATCHING --- p.27 / Chapter 4.1 --- Radon Transform based Encoding --- p.28 / Chapter 4.2 --- Iris Code Matching --- p.32 / Chapter 4.2.1 --- Regional Correlation --- p.32 / Chapter 5 --- PALM-TOP IMPLEMENTATION ON COMPUTING PLATFORM --- p.36 / Chapter 5.1 --- Image Acquisition --- p.37 / Chapter 5.1.1 --- Desktop Version --- p.37 / Chapter 5.1.2 --- Palm-top Version --- p.37 / Chapter 5.2 --- Iris Localization --- p.39 / Chapter 5.2.1 --- Desktop Version --- p.39 / Chapter 5.2.2 --- Palm-top Version --- p.39 / Chapter 5.3 --- Image Encoding --- p.41 / Chapter 5.3.1 --- Desktop Version --- p.41 / Chapter 5.3.2 --- Palm-top Version --- p.41 / Chapter 5.4 --- Palm-Top Computer Application --- p.42 / Chapter 5.4.1 --- Palm-top Computer Setting --- p.42 / Chapter 5.4.2 --- Software Selection --- p.42 / Chapter 5.4.3 --- Technical Problems --- p.43 / Chapter 5.4.3.1 --- Problem 1: Memory Limitation --- p.43 / Chapter 5.4.3.2 --- Problem 2: Image Format --- p.44 / Chapter 5.4.3.3 --- Problem 3: Origin of Image --- p.44 / Chapter 5.5 --- Our Iris Recognition Platform --- p.44 / Chapter 6 --- EXPERIMENTAL RESULTS --- p.47 / Chapter 6.1 --- The Test Data --- p.47 / Chapter 6.2 --- Experiment One: Eccentric Polar Coordinates System Recognition Performance --- p.48 / Chapter 6.2.1 --- Performance Measure of Recognition --- p.48 / Chapter 6.2.2 --- Experimental Result --- p.49 / Chapter 6.3 --- Experiment Two: Radon Transform-based Recognition System Performance --- p.53 / Chapter 6.3.1 --- Intra-group Similarity vs. Inter-group Similarity --- p.54 / Chapter 6.3.2 --- Performance Comparison with an Existing System --- p.57 / Chapter 6.4 --- Experiment Three: The Resolution of Image in the Eccentric-polar Coordinates System --- p.58 / Chapter 7 --- CONCLUSION AND FUTURE WORK --- p.62 / Chapter 7.1 --- Conclusion --- p.62 / Chapter 7.2 --- Future Work --- p.63 / APPENDIX A --- p.66 / APPENDIX B --- p.67 / BIBLIOGRAPHY --- p.73

Families of linear functionals on a vector space that are mapped to each other by a group of symmetries of the space have a significant amount of structure. This results in computational redundancies which can be used to make computing the entire family of functionals at once more efficient than applying each in turn. This thesis explores asymptotic complexity results for a few such families: contingency tables and unranked choice data. These are used to explore the framework of Radon transform diagrams, which promise to allow general theorems about linear summary statistics to be stated and proved.

The thesis gives a further step in the generalizations of the theorem of Lie, which have been already generalized by Saint-Donat, Griffíths, Henkin and Passare. He also gives applications of this theorem to characterization of complete intersection families, and goes further in the case of plane curves with the study of linear systems. He concludes with an application of the Abel's theorem to the construction of a domain with Levi-flat boundary on some "strongly singular" projective variety, which intersects every projective variety of complementary dimension.

No description available.