Thesis (M.S.)--Brigham Young University. Dept. of Computer Science, 2007. / Includes bibliographical references (p. 83-84).

Thesis (Ph.D.) - University of Queensland, 2004. / Includes bibliography.

Thesis (M. Arch.)--University of Hong Kong, 2004. / Includes special report study entitled: Movable architecture: a study of movable environment in the past, present and future. Also available in print.

I have used practice as method to investigate the creative potential of portable projectors, and theoretical approaches to reflect on: 1. the perception of the environment and its textures, 2. the sense of place-making and being while in motion, 3. the portability and collective mediation of the environment, and 4. the collaborative process of participation. These four themes emerged from the four video walks I developed during the research: The Surface Inside (2011), I-Walk (2012), Walk-itch (2013), and (wh)ere land (2014). To delve into the philosophical nuances and practical outcomes, I have paired the four video walks with the four themes. This research approach resembles the design process, where practice develops in the action of reflection (Schon, 1983). The thesis and portfolio are the result of an iterative practice-reflection process which is based on the thread metaphor. The experience of being and walking in the environment is proprioceptive (J. J. Gibson, 1986) and can only be partially conveyed through audiovisual records. People experience the complex texture of the environment in motion (i.e. accretion of surfaces). While moving, they thread their own paths into the environment (Ingold, 2007) and establish links with the environment, technology and others. As they move, people experience the texturality of the surfaces they encounter. Video records captured with visual apparatuses (Flusser, 2000) are a fraction of the points of observation a person may have adopted while walking in and experiencing the environment. These records are likely to be created with PEDs, shared in digital environments and accessed on digital screens. When these records are experienced on digital screens, the texture of the environment is reduced to a flat surface. PEDs, with their digital screens, are carried around everyday and enable people to communicate with others, to collect and share audiovisual material, and to experience hybrid environments where tangible and digital realms converge (Coyne, 2010). Audiovisuals can be accessed anywhere and are no longer dependent on the architectures that hosted them in the past. Yet, PEDs may also isolate people from their immediate surroundings and favour introspective engagement with audiovisual content, digital others and digital environments (Turkle, 2011). The size of PEDs limits the number of people that can engage with the content at only one time. Pocketsize devices tend to be used individually, and their audiovisual content played through digital screens and headphones which foster cocoon-like engagement. Through the four video walks, I investigate how portable projectors may be used to challenge this inward looking mode of experiencing audiovisuals on flat digital screens, and to devise participatory events where people thread their paths in the environment, and project and engage with audiovisuals together. In the video walks, I invite people to move with projections and explore mediated public environments. Instead of sitting in front of fixed projections or looking at digital screens, people experience and share visuals while walking and projecting them in the environment. Portable projectors are starting to be embedded in mobile phones and other portable electronic devices (PEDs), and this presents new challenges and opportunities to creative practitioners. Thus, I study the affordances of portable projectors and develop artworks where participants walk, project visuals and explore textures in the environment collectively.

Arsenic contamination in groundwater is a worldwide problem. The existing portable field test kits can not provide accurate results when the arsenic concentration is around 10 μg L-1 or lower. This research first was focused on the development and validation of methods in which portable instrumentation, such as electrochemistry instruments or quartz crystal microbalances, could be used to accurately determine arsenic concentrations in water even when the concentration is below 10 μg L-1. A modified anodic stripping voltammetry (ASV) and cathodic stripping voltammetry (CSV) method with measurement at a microarray electrode manufactured by TraceDetect Inc. was developed. When the ASV method with a gold electrode was applied for real water analysis, the detection limit of arsenite was 2.2 μg L-1, and for arsenate was 0.13 μg L-1. In the CSV method the more commonly used hanging mercury drop electrode was replaced with a mercury film array electrode. Under the optimum condition, this method had a detection limit for arsenite of 0.58 μg L-1 and for arsenate of 2.7 μg L-1. A method for the determination of arsenic using a quartz crystal microbalance was developed in which the crystal surface was modified in situ by dithiolthreitol, an arsenite-selective ingand. The method was applied to real water sample analysis with a limit of 0.6 μg L-1. The second was concerned with an investigation of the kinetics of the reactions that are the basis of several currently available field test kits (as exemplified by the Hach Kit) using inductively coupled plasma mass spectrometry (ICP-MS) with the goal of improving the performance of the test kit. The time for arsine gas reaches to the maximum concentration in the headspace of the vessel was about 60 min without continuous stirring and only 20% of arsenic was absorbed on the test strip. To speed up the arsine generation, continuous stirring condition can be applied. It also made more arsine absorbed on the test strip. The SEM study proves the structure of the darker colored compound. For the lighter colored compounds, the information is not enough to make a conclusion.

No description available.

No description available.

Volatile organic compounds (VOCs) are those chemical species having sufficiently high vapor pressures to exist largely or entirely in the gaseous phase, whereas reactive organic carbon (ROC) encompasses all organics except methane. ROC can be emitted biogenically and anthropogenically, usually in a pure hydrocarbon form that is susceptible to reaction with common atmospheric oxidants such as hydroxyl and ozone in the initial steps to the formation of particulate matter, the criteria pollutant most strongly implicated in human mortality. The diversity of both the emitted VOCs and their possible atmospheric reactions yields countless different compounds existing in the atmosphere with a correspondingly wide range of volatility, solubility, reactivity, etc.. Moreover, the temporal and spatial variability of a given analyte is often large. Real-time chemical characterization of gaseous and particulate organic compounds can be achieved by instrumentation utilizing chromatographic and/or mass spectrometric techniques, but these methods are expensive, often logistically challenging, and require high levels of skills for both operation and data analysis. Conversely, filter-based measurements for organic particulates are inexpensive and straightforward, but do not give real-time data and analytes may be lost or transformed before analysis. There is a niche for robust, low-maintenance, moderate-cost instrumentation that offers chemical information on atmospheric carbon. Presented here are two projects that develop and validate instrumentation for measuring ROC. The first combines flame ionization detection (FID) with a CO2 detector to estimate the O/C ratios of sampled gases and particulates. O/C ratios are a particularly valuable piece of chemical information as higher ratios give lower volatility and higher solubility, meaning increased propensity to partition into the condensed phase. The second project utilizes portable VOC samplers with sorbent tubes that trap and protect analytes for detailed analysis. The samplers' portability and programmable microcontrollers offers the investigator great flexibility, both spatially and temporally. A third project analyzed the chemical composition of commercially available fragrance mixtures and modeled their emissions' impact on oxidant reactivity. It was observed that terpenes, despite their low mole fractions in the mixtures, represent the vast majority of emitted reactivity and are quantitatively evolved from the mixtures in a matter of hours. / Doctor of Philosophy / Organic (i.e., carbon-containing) compounds are emitted into the atmosphere from a variety of natural and anthropogenic sources. Respective examples would include the agreeable aroma of a pine forest (from terpene compounds) or the pungent smell of gasoline (from additives such as toluene). These emitted compounds are often pure hydrocarbons (molecules formed of carbon and hydrogen atoms), and the category VOCs (volatile organic compound) encompasses hydrocarbons and the products of their chemical reactions with atmospheric oxidants like the hydroxyl radical and ozone. In the presence of pollutant nitrogen oxides, oxidants modify these VOCs; adding oxygen lowers the VOCs' vapor pressure and increases aqueous solubility, resulting in higher likelihood of condensation from the gaseous phase into particulates (liquid or solid phases). "Smog" is a colloquial term for the entire suite of noxious chemical compounds produced in the air from reactions of largely anthropogenic organic precursors. Particulates, a.k.a. aerosols, are the most concerning atmospheric pollutant due to deleterious effects on respiratory and cardiovascular health and has shown strong correlations with increased mortality in exposed groups such city dwellers. Determining the chemical identities of the VOCs is useful for pollution forecasting and possibly identifying and quantifying VOC sources. Current methods for chemical identification are cumbersome, expensive, complex, and wholly unsuitable for many investigators. In this work, we introduce two new approaches to gathering chemical information about organic gases and particulates. The first instrument has been demonstrated to give accurate estimates of oxygen/carbon (O/C) ratios; higher O/C ratios represent higher propensities to condense into particulate forms. The second instrument developed is a portable VOC sampler, which traps (and prevents reaction of) a broad range of organics on a sorbent (such as activated charcoal) in a small metal tube. After sampling in remote locales, the tubes can be analyzed in the lab and the VOCs identified and quantified. The third study investigated the chemical composition of fragrance mixtures (present in perfumes, cleaning agents, etc.) and modeled (i.e., estimated) VOC emissions based on the fragrance components as well as the effects on atmospheric oxidant levels. Fragrance mixtures represent a significant source of atmospheric carbon, so a more thorough understanding of the fragrances' impacts on oxidant levels gives further insight into atmospheric processes and aerosol formation.

No / This study is primarily focused on proving the potential of miniaturized Raman systems to detect any biomolecular and mineral signal in natural geobiological samples that are relevant for future application of the technique within astrobiologically aimed missions on Mars. A series of evaporites of varying composition and origin from two extremely dry deserts were studied, namely Atacama and Mojave. The samples represent both dry evaporitic deposits and recent evaporitic efflorescences from hypersaline brines. The samples comprise halite and different types of sulfates and carbonates. The samples were analysed in two different ways: (i) directly as untreated rocks and (ii) as homogenized powders. Two excitation wavelengths of miniaturized Raman spectrometers were compared: 532 and 785 nm. The potential to detect carotenoids as biomarkers on Mars compared with the potential detection of carbonaceous matter using miniaturized instrumentation is discussed.

Master of Landscape Architecture / Department of Landscape Architecture/Regional and Community Planning / Howard D. Hahn / Cities and towns across the world are in a dynamic state of change, and therefore, becoming responsive to new and innovative approaches to creating and restoring public spaces. These new approaches address the need for flexible, multifunctional spaces in order to adapt to and accommodate the changing demands and unexpected circumstances that occur within the city (Wall 1999, Temel 2006, Gehl 2011). Temporary landscapes, or site specific, time-limited designs of open space, have become an emerging approach to improving public spaces. These small scale projects provide unique experiences and offer a laboratory for experimentation where new, innovative ideas can be tested (Lydon 2012, Sargin and Savas 2012, Temel 2006). The idea of flexibility and the need for multifunctional spaces are explored through the following report by investigating how an innovative approach involving temporary landscapes can enhance streetscape quality and offer a variety of public activities. First, I developed a deeper understanding of temporary landscapes in order to identify the transition in approach to urban design from focusing on permanence to temporary, and express the importance of temporality in urban design. A design matrix exploring programmatic options and customizable design features was established through an extensive literature review and case study analysis. Through the application process, I explored the regulatory process involved in implementing a temporary landscape intended for the Aggieville Business District in Manhattan, Kansas. This procedure involved a review of the city's ordinances and liability concerns, designing a portable landscape, and constructing a prototype to be deployed off-street until approval is gained. The results from this project provide field evidence to support recommendations for future design iterations for portable landscapes that increase pedestrian comfort and support an expanded range of activities for public spaces. Prototypes of different design iterations and replications can also serve as future projects for the College of Architecture, Planning, and Design at Kansas State University. Ultimately, this project will begin a critical discussion of the future role of temporary landscapes in cities that are in a dynamic state of change.