No description available.

There is a growing body of literature that recognizes the importance of outdoor learning spaces in educational practice with children. However, previous studies of the outdoor learning spaces have omitted to address the young children’s perspectives on the outdoor environments that they experience as a part of the Forest School’s educational approach. Research on the subject has been mostly restricted to an adult perspective. Furthermore, the previously published studies are limited to Scandinavian countries and available in Scandinavian languages and, therefore, not easily accessible to an international audience. The aim of the present dissertation project is to explore young children’s (aged 3-6 years) voices on their experience, sense-making, and understanding of the educational space of a forest. A qualitative research paradigm was employed to explore the components that characterize children’s perception of the outdoor educational space. Ethnographic research methods (participants observation, informal conversation and material collection) were used to investigate children’s outdoor activities performed in two Italian preschools: a kindergarten outdoor oriented school and a Forest School. The collected materials (fieldnotes, interviews, and children’s drawings) were processed using a six-steps Thematic Analysis with the aim to gain a complex account of the data. The results indicate that the way children use, interact and, confer a meaning to their experience in the woods are represented by the following themes: Type of Place Attended, Nature Engagement, Relationship with the Woods, Responsibility and Risk, Imagination, Emotional Responses, Affordances, Relationships with Others, Discovery and Experimentation, Nature Education, Concerns for Nature, and Learnings Connected to the Curriculum.These results have provided a deeper insight on the children’s experience of the outdoor learning space of a forest. Moreover, the empirical findings in this study contributed to provide a new understanding of how children bond with the natural world and how they behave and experience it. Taking into account the exploratory nature of the present thesis, future research should further address the children’s perspectives on the outdoor education space, the forest. Furthermore, it would be interesting to investigate if the cognitive, emotional, and social resources and environmental attitudes developed by children in the forest as outdoor educational space are strictly intertwined with this particular environment or if they can be realized in more a conventional school setting.

In recent years, there have been incidents which decreased people's trust in some organizations and authorities responsible for ratings and accreditation. For a few prominent examples, there was a security breach at Equifax (2017), misconduct was found in the Standard & Poor's Ratings Services (2015), and the Accrediting Council for Independent Colleges and Schools (2022) validated some of the low-performing schools as delivering higher standards than they actually were. A natural solution to these types of issues is to decentralize the relevant trust management processes using blockchain technologies. The research problems which are tackled in this thesis consider the issue of trust in reputation for assessment and review credibility at different angles, in the context of blockchain applications. We first explored the following questions. How can we trust courses in one college to provide students with the type and level of knowledge which is needed in a specific workplace? Micro-accreditation on a blockchain was our solution, including using a peer-review system to determine the rigor of a course (through a consensus). Rigor is the level of difficulty in regard to a student's expected level of knowledge. Currently, we make assumptions about the quality and rigor of what is learned, but this is prone to human bias and misunderstandings. We present a decentralized approach that tracks student records throughout the academic progress at a school and helps to match employers' requirements to students' knowledge. We do this by applying micro-accredited topics and Knowledge Units (KU) defined by NSA's Center of Academic Excellence to courses and assignments. We demonstrate that the system was successful in increasing accuracy of hires through simulated datasets, and that it is efficient, as well as scalable. Another problem is how can we trust that the peer reviews are honest and reflect an accurate rigor score? Assigning reputation to peers is a natural method to ensure correctness of these assessments. The reputation of the peers providing rigor scores needs to be taken into account for an overall rigor of a course, its topics, and its tasks. Specifically, those with a higher reputation should have more influence on the total score. Hence, we focused on how a peer's reputation is managed. We explored decentralized reputation management for the peers, choosing a decentralized marketplace as a sample application. We presented an approach to ensuring review credibility, which is a particular aspect of trust in reviews and reputation of the parties who provide them. We use a Proof-of-Stake based Algorand system as a base of our implementation, since this system is open-source, and it has a rich community support. Specifically, we directly map reputation to stake, which allows us to deploy Algorand at the blockchain layer. Reviews are analyzed by the proposed evaluation component using Natural Language Processing (NLP). In our system, NLP gauges the positivity of the written review, compares that value to a scaled numerical rating given, and determines adjustments to a peer's reputation from that result. We demonstrate that this architecture ensures credible and trustworthy assessments. It also efficiently manages the reputation of the peers, while keeping reasonable consensus times. We then turned our focus on ensuring that a peer's reputation is credible. This led us to introducing a new type of consensus called "Proof-of-Review". Our proposed implementation is again based on Algorand, since its modular architecture allows for easy modifications, such as adding extra components, but this time, we modified the engine. The proposed model then provides a trust in evaluations (review and assessment credibility) and in those who provide them (reputation credibility) using a blockchain. We introduce a blacklisting component, which prevents malicious nodes from participating in the protocol, and a minimum-reputation component, which limits the influence of under-performing users. Our results showed that the proposed blockchain system maintains liveliness and completeness. Specifically, blacklisting and the minimum-reputation requirement (when properly tuned) do not affect these properties. We note that the Proof-of-Review concept can be deployed in other types of applications with similar needs of trust in assessments and the players providing them, such as sensor arrays, autonomous car groups (caravans), marketplaces, and more.

No description available.

論文摘要 〈論純粹知性概念之推證〉一章可以說是《純粹理性批判》當中最重要的章節之一。康德在這個章節中企圖證明完全根源於知性自身的純粹知性概念（也就是範疇）運用到經驗對象上的可能性，並藉此劃定認知的有效範圍。這是《純粹理性批判》企圖解決形上學紛爭的一個重要關鍵。然而，這個章節同時也是康德宣稱他花費了最大心力，並在第二版《純粹理性批判》當中完全改寫的篇章之一，在這個短短的五六十頁的篇幅當中卻包含了許多詮釋上的爭議。而本論文則以第二版〈推證〉為主要討論範圍，並嘗試回答其中三個詮釋上的問題：1. 〈推證〉是否包含了一個反懷疑論的論證？2. 第二版〈推證〉可區分出的兩個部份分別負擔了什麼任務？3. 先驗統覺在〈推證〉中扮演了什麼角色？並在確立對以上幾個問題的觀點之後，提供一個的對第二版〈推證〉的細部解釋。 為了回答這幾個問題，筆者比較了Paul Guyer、Dieter Henrich、Henry Allison等幾個詮釋者的觀點。而本論文總共包含了五個章節。第一章作為導論，介紹筆者在本論文中所欲處理的問題以及對論文所安排的架構。在第二章當中，筆者以Guyer作為一個反懷疑論式詮釋〈推證〉的類型，並指出這種詮釋方式與文本的不合之處。在第三章當中，筆者將介紹Henrich針對第二版〈推證〉所提出的「一個證明兩個步驟」的詮釋架構以及對兩個步驟的詮釋，並藉由Allison的批評，介紹另一種同樣在「一個證明兩個步驟」下且筆者認為更適當的詮釋方式。在第四章當中，筆者嘗試回答關於解釋統覺的諸問題，它們包括了統覺的含義、統覺與雜多表象的關係、統覺原理的邏輯地位、統覺原理在〈推證〉中起的作用等。在確立了以上諸觀點後，筆者在第四章和第五章當中，按照兩個步驟的架構提供一個對第二版〈推證〉的完整解釋。 / Abstract "On the Deduction of the Pure Concepts of Understanding" is widely agreed to be the most important chapter in the Critique of the Pure Reason. In this chapter Kant attempts to demonstrate that the pure concepts of understanding, namely, categories, which completely stem from understanding itself, can be applied to empirical objects and thereby define the boundary of cognition. This is critical to resolve the dispute in the metaphysics of his predecessors. However, Kant also claims that this chapter is the part, which costs him the greatest effort and which he entirely rewrites in the second edition of the Critique. There are so many controversial interpretations related to this chapter, which is yet only complied up to 50-60 pages. In this thesis I focus on Deduction in the second edition of the Critique and try to answer the following three questions about these controversies: 1. Whether the Deduction contains an anti-skeptical argument? 2. What are the tasks of the two parts respectively that can be distinguished in B-Deduction? 3. What is the role that transcendental apperception plays in the Deduction? After establishing these answers, I will contribute a detailed explanation of whole B-Deduction. In order to answer the questions, I compare the perspectives of three interpreters of Kant, namely, Paul Guyer, Dieter Henrich and Henry E. Allison. This article is divided into five chapters. Chapter 1 is the introduction, in which I introduce the problems that I hope to resolve and the structure of the thesis. In Chapter 2, I introduce Guyer's interpretation of Deduction, which is an anti-skeptical Model, and I will indicate that his interpretation doesn't conform to the Kant's text. In Chapter 3, I introduce Henrich's famous thesis about the structure of the B-Deduction, namely, the thesis of two-steps-in-one-proof, and his interpretation of the contents of the two steps.Then I introduce Allison's criticism against Henrich and his alternative interpretation of B-Deduction under the frame of two-steps-in-one-proof. I believe this interpretation is more consistent and more conformable to the text. In Chapter 4, I try to answer the questions about the interpretation of apperception, where the issues such as the meaning of apperception, the relation between apperception and manifold, the principle of apperception's logical status, the apperception's role in the Deduction etc. will be discussed. After establishing my perspectives about these interpretative problems, I will present a complete and detailed explanation of B-Deduction according to the two-step structure.

O trabalho realizado nesta tese esteve apoiado em dois objetivos principais. O primeiro centrado na otimização das etapas e processos de fabricação de células solares de silício de alto rendimento envolvendo redução de custos. O segundo objetivo foi direcionado na implementação de células solares eficientes e não dependentes do armadilhamento de impurezas através da difusão de alumínio. Para levar a cabo estes objetivos de forma planejada, o trabalho dividiu-se em otimizações teóricas e implementações experimentais. As otimizações teóricas foram realizadas utilizando dois programas: um programa desenvolvido (simulacell.pas) e implementado no próprio LME (versão 2), e o outro adquirido comercialmente, PC1D. De acordo com os resultados obtidos em estruturas completas n+p e n++n+p foi possível concluir que tanto as estruturas formadas através de emissores homogêneos como as obtidas utilizando emissores duplamente difundidos permitem alcançar eficiências elevadas, 25,5% a 26,0%, respectivamente, em um amplo intervalo de espessuras e concentrações superficiais de dopantes. No que tange aos desenvolvimentos experimentais, este trabalho se inicia com o desenvolvimento de um processo simplificado de baixo custo, em células solares de silício Cz de baixa resistividade com estrutura n+pp+, tipo \"mesa\". Este processo simplificado também está baseado na difusão de fósforo e alumínio (P/Al), utilizando gases industriais e reagentes químicos de grau \"para análise\", como uma transposição do processo de fabricação anteriormente desenvolvido no LME-EPUSP em substratos de silício FZ utilizando tecnologia planar. A célula solar mais representativa do processo implementado, A-16-1, permitiu atingir eficiências no entorno de 17%. As implementações experimentais visaram inicialmente o desenvolvimento de um procedimento visando à qualificação de materiais de partida (silício), utilizando a técnica de decaimento fotocondutivo (PCD) através de dois procedimentos de passivação de superfícies; oxidações térmicas e difusões suaves de fósforo. Posteriormente, utilizando o sistema PCD, novas otimizações dos emissores de tipo n+ homogêneos e regiões de tipo p foram realizadas, seguidos por oxidações térmicas passivadoras hidrogenadas, preservando-se o tempo de vida do volume em valores elevados (aproximadamente 1ms, após a realização de todas as etapas térmicas). Estes resultados qualificam o silício e os materiais de consumo utilizados, assim como, o novo processo de fabricação desenvolvido. Esta técnica também permitiu qualificar os emissores com perfil Gaussianos processados, atingindo valores da ordem de 45fA/cm2 para densidades de recombinação em estruturas n+pn+. Desenvolveram-se também estruturas n+p em materiais Cz de baixa resistividade 2-3W.cm de dois diferentes fabricantes, e silício FZ com 0,5W.cm. Pôde ser comprovada a qualidade das etapas que compõem o processo completo otimizado tendo-se obtido tensões de circuito aberto-implícitas de 652,4mV (Si-Cz fabricante 1) e 662,6mV (Si-Cz fabricante 2), e 670,8mV (FZ). De acordo com simulações realizadas utilizando parâmetros habituais de dispositivos do próprio LME, estas tensões, quando associadas a um conjunto óptico frontal típico das células solares de alto rendimento do LME (texturização química aleatória e filme de SiO2), permitirão atingir valores entre 19% - 20%. Entretanto, utilizando texturização e camada dupla torna-se plausível atingir o marco de 21% de rendimento, ultrapassando assim a barreira dos 17% (recorde nacional), e comprovando a potencialidade da infra-estrutura deste laboratório para o desenvolvimento de células solares não dependentes do efeito do armadilhamento de impurezas através da difusão de alumínio. / The work developed at this thesis has been based on two main objectives. First, it was focused on the optimization of the steps and processes for the fabrication of high efficiency solar cells, reducing production costs. The latter objective was directed to develop solar cells that were efficient and non-dependent on impurities gettering performed through the aluminum diffusion. In order to attend the planned objectives the work was divided into the theoretical objectives and experimental developments. The theoretical optimizations were performed using two different program codes: one was developed at LME (simulacell.pas), being upgraded afterwards (version 2); and the other was acquired commercially, the PC1D. According to the obtained results in complete structures n+p and n++n+p, it was possible to conclude that the homogeneous and double diffused emitter structures can provide high efficiencies, from 25,5% to 26,0%, respectively, for a wide range of thicknesses and surface doping levels. Concerning the experimental developments, this work starts with a low cost simplified process, using Cz silicon solar cells with low base resistivity and the structure n+pp+, \"mesa\" type. This simplified process was also based on the phosphorus/ aluminum diffusion (P/Al), using industrial gases and for analysis grade chemical reagents, as a fabrication process transposition of the process previously developed at LME-EPUSP using silicon substrates with planar technology. The most representative solar cells of the implemented process, A-16-1, provided about a 17% efficiency. The experimental implementations aimed the development of procedure for starting material (silicon) qualification, by using the photoconductive decay technique (PCD) with two surface passivation procedures: thermal oxidation and light phosphorus diffusion. Later, using PCD system, new optimizations of n+ homogeneous emitters and p-type region were performed, followed by passivating thermal oxidations with hydrogenation, maintaining the volume lifetime at high values (approximately 1ms, after each thermal step). These results qualified the used silicon and the consumer materials, as well the new fabrication process developed. This technique has also allowed qualifying the processed Gaussian profile emitters, providing values about 45fA/cm2 for the recombination current density in n+pp+ structures. N+p structures were also developed using Cz silicon with low resistivity 2- 3W.cm of two different manufacturers and FZ with 0.5W.cm. It could be proved the quality of the steps of a complete optimized process resulting implicit open circuit voltages of 652.4mV (Cz silicon - manufacturer type 1), 662.6mV (Cz silicon - manufacturer type 2), and 670.8mV (FZ silicon). According to the theoretical simulations performed using the usual parameters of devices processed at LME (random chemical texturization and SiO2 film), efficiencies between 19%-20% can be reached. However, using a random texturization and a double layer anti-reflection system, a 21% efficiency becomes possible, surpassing the 17% barrier (national record), and proving the potentiality of this laboratory facility for the development of solar cells non-dependent on impurity gettering through the aluminum diffusion.

O trabalho realizado nesta tese esteve apoiado em dois objetivos principais. O primeiro centrado na otimização das etapas e processos de fabricação de células solares de silício de alto rendimento envolvendo redução de custos. O segundo objetivo foi direcionado na implementação de células solares eficientes e não dependentes do armadilhamento de impurezas através da difusão de alumínio. Para levar a cabo estes objetivos de forma planejada, o trabalho dividiu-se em otimizações teóricas e implementações experimentais. As otimizações teóricas foram realizadas utilizando dois programas: um programa desenvolvido (simulacell.pas) e implementado no próprio LME (versão 2), e o outro adquirido comercialmente, PC1D. De acordo com os resultados obtidos em estruturas completas n+p e n++n+p foi possível concluir que tanto as estruturas formadas através de emissores homogêneos como as obtidas utilizando emissores duplamente difundidos permitem alcançar eficiências elevadas, 25,5% a 26,0%, respectivamente, em um amplo intervalo de espessuras e concentrações superficiais de dopantes. No que tange aos desenvolvimentos experimentais, este trabalho se inicia com o desenvolvimento de um processo simplificado de baixo custo, em células solares de silício Cz de baixa resistividade com estrutura n+pp+, tipo \"mesa\". Este processo simplificado também está baseado na difusão de fósforo e alumínio (P/Al), utilizando gases industriais e reagentes químicos de grau \"para análise\", como uma transposição do processo de fabricação anteriormente desenvolvido no LME-EPUSP em substratos de silício FZ utilizando tecnologia planar. A célula solar mais representativa do processo implementado, A-16-1, permitiu atingir eficiências no entorno de 17%. As implementações experimentais visaram inicialmente o desenvolvimento de um procedimento visando à qualificação de materiais de partida (silício), utilizando a técnica de decaimento fotocondutivo (PCD) através de dois procedimentos de passivação de superfícies; oxidações térmicas e difusões suaves de fósforo. Posteriormente, utilizando o sistema PCD, novas otimizações dos emissores de tipo n+ homogêneos e regiões de tipo p foram realizadas, seguidos por oxidações térmicas passivadoras hidrogenadas, preservando-se o tempo de vida do volume em valores elevados (aproximadamente 1ms, após a realização de todas as etapas térmicas). Estes resultados qualificam o silício e os materiais de consumo utilizados, assim como, o novo processo de fabricação desenvolvido. Esta técnica também permitiu qualificar os emissores com perfil Gaussianos processados, atingindo valores da ordem de 45fA/cm2 para densidades de recombinação em estruturas n+pn+. Desenvolveram-se também estruturas n+p em materiais Cz de baixa resistividade 2-3W.cm de dois diferentes fabricantes, e silício FZ com 0,5W.cm. Pôde ser comprovada a qualidade das etapas que compõem o processo completo otimizado tendo-se obtido tensões de circuito aberto-implícitas de 652,4mV (Si-Cz fabricante 1) e 662,6mV (Si-Cz fabricante 2), e 670,8mV (FZ). De acordo com simulações realizadas utilizando parâmetros habituais de dispositivos do próprio LME, estas tensões, quando associadas a um conjunto óptico frontal típico das células solares de alto rendimento do LME (texturização química aleatória e filme de SiO2), permitirão atingir valores entre 19% - 20%. Entretanto, utilizando texturização e camada dupla torna-se plausível atingir o marco de 21% de rendimento, ultrapassando assim a barreira dos 17% (recorde nacional), e comprovando a potencialidade da infra-estrutura deste laboratório para o desenvolvimento de células solares não dependentes do efeito do armadilhamento de impurezas através da difusão de alumínio. / The work developed at this thesis has been based on two main objectives. First, it was focused on the optimization of the steps and processes for the fabrication of high efficiency solar cells, reducing production costs. The latter objective was directed to develop solar cells that were efficient and non-dependent on impurities gettering performed through the aluminum diffusion. In order to attend the planned objectives the work was divided into the theoretical objectives and experimental developments. The theoretical optimizations were performed using two different program codes: one was developed at LME (simulacell.pas), being upgraded afterwards (version 2); and the other was acquired commercially, the PC1D. According to the obtained results in complete structures n+p and n++n+p, it was possible to conclude that the homogeneous and double diffused emitter structures can provide high efficiencies, from 25,5% to 26,0%, respectively, for a wide range of thicknesses and surface doping levels. Concerning the experimental developments, this work starts with a low cost simplified process, using Cz silicon solar cells with low base resistivity and the structure n+pp+, \"mesa\" type. This simplified process was also based on the phosphorus/ aluminum diffusion (P/Al), using industrial gases and for analysis grade chemical reagents, as a fabrication process transposition of the process previously developed at LME-EPUSP using silicon substrates with planar technology. The most representative solar cells of the implemented process, A-16-1, provided about a 17% efficiency. The experimental implementations aimed the development of procedure for starting material (silicon) qualification, by using the photoconductive decay technique (PCD) with two surface passivation procedures: thermal oxidation and light phosphorus diffusion. Later, using PCD system, new optimizations of n+ homogeneous emitters and p-type region were performed, followed by passivating thermal oxidations with hydrogenation, maintaining the volume lifetime at high values (approximately 1ms, after each thermal step). These results qualified the used silicon and the consumer materials, as well the new fabrication process developed. This technique has also allowed qualifying the processed Gaussian profile emitters, providing values about 45fA/cm2 for the recombination current density in n+pp+ structures. N+p structures were also developed using Cz silicon with low resistivity 2- 3W.cm of two different manufacturers and FZ with 0.5W.cm. It could be proved the quality of the steps of a complete optimized process resulting implicit open circuit voltages of 652.4mV (Cz silicon - manufacturer type 1), 662.6mV (Cz silicon - manufacturer type 2), and 670.8mV (FZ silicon). According to the theoretical simulations performed using the usual parameters of devices processed at LME (random chemical texturization and SiO2 film), efficiencies between 19%-20% can be reached. However, using a random texturization and a double layer anti-reflection system, a 21% efficiency becomes possible, surpassing the 17% barrier (national record), and proving the potentiality of this laboratory facility for the development of solar cells non-dependent on impurity gettering through the aluminum diffusion.

這篇論文試著以凱登的行政改革理論與科可特對行政改革現象的見解為基礎，來分析英國行政改革的各項措施，包括雷尼稽核、財務管理改革方案、附屬機關改革方案與90年代後的「公民誓約」運動，探究改革理論與現象與英國行政改革方案兩者之間的關連性，並對此提出對我國行政改革的提醒 第一章 緒論 第一節 研究動機、目的與流程 壹、 研究動機 貳、 研究目的 參、 研究流程 第二節 研究問題、方法與限制 壹、 研究問題陳述- 貳、 研究方法 參、 研究限制 第二章 行政改革理論與改革現象的探究 第一節 改革背景與過去研究文獻檢閱 壹、 背景說明 貳、 檢閱過去研究文獻 第二節 行政改革理論的介紹 第三節 改革思潮的探究—公共管理、新公共管理 與經濟學理論的應用 壹、公共管理 貳、新公共管理 參、相關經濟學理論的應用 第四節 行政改革所引發的政策弔詭情況 壹、改革政策所造成的普遍現象 貳、改革政策所造成的弔詭（Paradoxes）情況 第三章 英國行政改革的策略 第一節 八零年代前的行政改革 壹、諾斯科特一特拉維揚調查報告 貳、富爾頓委員會報告 第二節 從雷尼稽核到續階計畫 壹、雷尼稽核 貳、財務管理改革方案 參、續階計畫 第三節 公民誓約 壹、甚麼是公民誓約（Citizen Charter） 貳、公民誓約如何應用 參、公民誓約的檢討 第四節 結論 第四章 英國行政改革政策的檢視 第一節 改革政策的回顧與檢討 壹、整體改革政策的回顧 貳、整體改革政策的檢討 第二節 改革理論與改革政策的印證 壹、行政改革理論與改革政策的相互印證 貳、改革所造成的普遍政策現象與英改革方案的印證 參、改革弔詭現象與英改革方案的印證 第三節 改革政策於我國的啟示 壹、在理論指導方面 貳、在制度建構方面 參、在執行層面方面 第五章 結論 第一節 論文回顧與研究發現 壹、論文回顧 貳、研究發現 第二節 對後續研究者的建議 附錄 附錄1 英國行政改革重要的機關與措施《中英文對照表》 附錄2 英國行政改革重要人物人名對照表 附錄3 1979-1997英國行政改革政經系絡與政策歷程 / This paper try to analyze Caiden's administration reform theory and Kickert's administration reform phenomenon opinion,and take them to analyze Britain administration reform every measures.This include Rayner Scrutinies、Financial Management Initiative、Agency Management Initiative and 90s'「The Citizen’s Charter」movement,to investigate between administration reform theory and phenomenon and Britain administration reform measures to have any corelation.Last,take conclusion to remind our administration reform.

The disposal of waste from agricultural activities has been recognised as a source of environmental contamination by endocrine disrupting chemicals (EDCs). The New Zealand dairy industry produces a large volume of dairy farm effluent, which contains EDCs in the form of estrogens. Most of this dairy farm effluent is applied onto the land for disposal. Groundwater and soil contamination by estrogens following waste application on the land have been reported overseas, but our understanding of the processes and factors governing the fate of estrogens in the soil is poor. Therefore the main goal of the present study was to better understand the fate and transport of estrogens, in particular 17β-estradiol (E2) and estrone (E1) in soil. In order to quantify E1 and E2 in drainage water and soil samples, chemical analysis by gas-chromatography mass-spectrometry (GC-MS) was carried out. This included sample extraction, sample clean-up through silica gel and gel permeation chromatography, and sample extract derivatisation prior to analysis. In order to develop a reliable method to extract estrogens from soil, research was conducted to optimise E1 and E2 extraction conditions by adjusting the number of sonication and shaking events, as well as the volume and type of solvent. Among five solvents and solvent mixtures tested, the best recovery on spiked and aged soil was obtained using an isopropanol/water (1:1) mix. A microcosm experiment was carried out to determine the dissipation rates of E2 and E1, at 8°C and at field capacity, in the Templeton soil sampled at two different depths (5-10 cm and 30-35 cm). The dissipation rates decreased with time and half-life values of 0.6-0.8 d for E1 and 0.3-0.4 d for E2 were found for the two depths studied. A field transport experiment was also carried out in winter, over three months, by applying dairy farm effluent spiked with estrogens onto undisturbed Templeton soil lysimeters (50 cm in diameter and 70 cm deep). The hormones were applied in dairy farm effluent at 120 mg m⁻² for E2 and 137 mg m⁻² for E1. The results of the transport experiment showed that in the presence of preferential/macropore flow pathways 0.3-0.7% of E2 and 8-13% of E1 was recovered in the leachate at the bottom of the lysimeters after 3 months, and 1-7% of the recovered E2 and 3-54% of the recovered E1 was leached within 2 days of application. These results suggest that leaching of estrogens via preferential/macropore flow pathways is the greatest concern for groundwater contamination. In the absence of preferential/macropore flow pathways, a significant amount (> 99.94%) of both hormones dissipated in the top 70 cm of soil, due to sorption and rapid biodegradation. Surprisingly, in all cases, estrogen breakthrough occurred before that of an inert tracer (bromide). This could not be explained by the advection-dispersion transport of estrogens, nor by their presence as antecedent concentrations in the soil. It was therefore suggested that colloidal enhanced transport of estrogens was responsible for the earlier breakthrough of estrogens and caused the leaching of a fraction of the applied estrogens to a soil depth of 70 cm. A two-phase model, adapted from a state-space mixing cell model, was built to describe the observed estrogen transport processes under transient flow. The model takes into account 3 transport processes namely, advection-dispersion, preferential/macropore flow and colloidal enhanced transport. This model was able to successfully describe the estrogen transport observed from the lysimeters.

I am fascinated by the inner thoughts, the memories, and the cumulative experience that make us each a complex physiological puzzle. From birth, sociological building blocks are constructed forming emotional walls and unexpected doorways, boundaries and comfortable passageways through the architecture of our personalities. My thesis work, which is comprised of ceramic figures and interactive toys, offers playful memory triggers and evocative spaces in which viewers can deconstruct the building blocks of their social persona.