Thesis (D. Min.)--Abilene Christian University, 2004. / Includes abstract and vita. Includes bibliographical references (leaves 206-207).

Thesis (D. Min.)--Abilene Christian University, 2004. / Includes abstract and vita. Includes bibliographical references (leaves 206-207).

This thesis will explore Boise, Idaho as a real-world case study of the car dominated American cities, and the potential to enact a large-scale shift to alternative forms of transportation. Examining the complexities of inter-governmental and communal-governmental relationships to better understand the history and current state of infrastructure and alternative transit facilities in Boise and theorizing a best path forward. The thesis will also delve into bicycle activists’ groups operating in Boise, to assess their goals and methods of reaching those goals.

The ability of surface-treated silica nanoparticles to stabilize oil/water emulsions presents us with many interesting avenues of study. The goal of this research is to assess the ability of a dispersion of specially surface-treated nanoparticles to stabilize an oil/water emulsion of prescribed internal structure created by flow within a fracture. We hypothesize that for a set of conditions (nanoparticle concentration, salinity, aqueous to organic phase ratio) a critical shear rate exists. That is, for flow rates that exceed this critical shear rate, an emulsion can be created. Flow experiments were conducted within fractured Boise sandstone and cement cylinders. The Boise sandstone core (D = 1 in and L = 12 in) was cut down its length and propped open to a specific aperture with beads. The fracture was saturated with dodecane then displaced with nanoparticle dispersion, and vice versa while pressure drop across the fracture was recorded. Class H cement cylinders (D = 1 in and L = 3 in) were allowed to set, then failed in compression to create a rough-walled fracture along their length. These fractured cement cylinders were then sealed and encased in epoxy to isolate the fractures. CT scans of the encased fractures were used to determine the aperture width, which is utilized when calculating the shear rate inside of the fracture maintained during an experiment. A dispersion of surface-modified silica nanoparticles and decane were coinjected into both the Boise sandstone and cement fractures and the pressure drop was measured across the fractures at a variety of shear rates. The effluent of each experiment was collected in sample tubes. Observation of the effluent and pressure drop data both support our hypothesis of emulsion generation being possible once a critical shear rate has been reached. Alteration of the injected phase ratio and increased residence time of the two phases inside of a fracture both affect the amount of emulsification occurring within the fractures. Increasing the residence time of both phases within a fracture allows for more opportunities for emulsification to occur, resulting in a greater amount of emulsion to be generated. Injection of high or low volumetric ratios of nanoparticle dispersion to organic phase results in little amounts of emulsion generation; however, between the nanoparticle dispersion to organic phase ratios of 0.25:1 and 2:1 significant amounts of emulsion are generated. / text

The purpose of this creative project is an inquiry into the design of environmentally responsive and human sensitive surface parking environments for dry temperate climate and results of the inquiry are applied to an existing parking lot for the 8th Street Market Place, Boise, Idaho. Major issues explored are the physical design and the relationship between surface parking lots as a place for both vehicles and pedestrians. The main focus is the provision of an appropriate number of parking stalls, incorporation of plants and harvest of stormwater. A key premise of the inquiry is that adequate parking is more than supplying all of the spaces physically possible, but examining different components of site use to better estimate the demand for parking. Incorporating plants, especially shade trees, can significantly modify the microclimate of a parking lot for the comfort of people within the space. Having trees fulfill their role in the landscape is largely dependent on providing sufficient below ground space. The majority of trees and other plants used in Boise originate from climates that receive more rain, which results in the need for supplemental irrigation to compensate their hydraulic requirements. Rather than viewing stormwater as a waste by product, stormwater can be used as a resource to irrigate these plants. Runoff can be used directly to irrigate plants, and/or be stored for later use. While this creative project examined a particular site, many of the concepts and techniques can be extended to other sites. / Department of Landscape Architecture

This creative project inspected the design of water conserving landscapes by restoring native vegetation. Water conserving design principles discovered in the background research were applied to the redesign of the Old Fort Boise Park in Parma, Idaho. Important issues that were explored included discussing the need for water conserving landscape designs that result in functional spaces that meet the needs of intended users. The main focus of water conservation was implemented by using native plants that typically require less water than non-native species. The project developed a park master plan that could demonstrate to Idaho residents that native plants, when carefully sited, result in lower maintenance, aesthetically pleasing visual qualities, environmentally sensitive performances and could be integrated into landscapes on private or public properties. Rather than viewing the Idaho native plants as unattractive and dull, this project explored the idea that under cultivation and as part of the site character a carefully designed water conserving naturalized landscape has a beauty unsurpassed by traditional landscapes. The park redesign also employed educational and interpretive systems wherein native plants were highlighted and identified. These educational and interpretive systems could assist park users, especially local residents, in familiarizing themselves with many of the beautiful native species that are common in the surrounding deserts, prairies, hills and mountains. The creative project examined one particular site, while it developed principles and concepts applicable to other sites throughout the Great Basin Region. / Department of Landscape Architecture

There are four distinguishable groundwater systems in the Boise area, Idaho, U.S.A., identified as modern batholith, thermal batholith, Boise frontal fault, and Nampa-Caldwell systems (Figure 1). Modern batholith and thermal batholith groundwaters are located in Tertiary to Cretaceous aged granites and granodiorites of the Atlanta lobe of the Idaho Batholith. The frontal fault system near Boise, ID defines the southeastern edge of the Idaho Batholith, and divides the batholith from the western Snake River Plain. The Nampa-Caldwell system is in the volcanic, fluvial and pluvial sediments of the western Snake River Plain. Groundwater ages for these systems are modern, 5-15 ka, 10-20 ka, and 20-40 ka respectively. Local meteoric water lines (LMWL) using the delta 2H and delta 18O composition of the groundwater were defined for each system using linear regression techniques. LMWL had variable and defined single slopes of 6.94 and 8. Deuterium excess values (d) were found for each system for each linear regression method. Relative differences of the deuterium excess value assuming the two single slope methods were similar. Changes in moisture source humidity and temperature, and Boise area recharge temperatures calculated from stable isotopic data and the deuterium excess factor agree with other published data. At the moisture source there was a 9% humidity increase and a 7-6 °C decrease of sea surface temperature between the present and the last glacial maximum (LGM). The local temperature decreased 4-5 °C from the present to the LGM for the Boise area.

The thermal springs along the Middle Fork of the Boise River (MFBR) within the Atlanta lobe of the Idaho batholith discharge in discrete locations that appear to be part of self-organizing flow systems. Infiltrating water flows through Basin and Range fractures to depth where it is heated and ultimately discharged at the intersection of trans-Challis oriented faults along the MFBR. Isotopic compositions of the thermal waters have a linear trend with elevation suggesting that the recharge locations are near each thermal spring and the hydrothermal system is not one large interconnected system, but rather multiple individual hydrothermal systems. Water chemically evolves along the hydrothermal flow paths dissolving feldspars and precipitating secondary minerals. PHREEQC inverse modeling of the chemical evolution based on identified minerals within the system predicts positive volume changes in the pore space within the hydrothermal flow systems can occur. Precipitation of secondary minerals is likely to occur in the cooler, subsidiary, less-efficient fractures of the hydrothermal system. Flow areas calculated using heat flow, exponential decay, and a combination of the two, show that the topographic watershed is inadequate to accommodate the water supporting the thermal springs indicating that water is being captured from outside the watershed. The positive volume changes coupled with the water capture is evidence of positive feedback loops are active within the hydrothermal system providing a mechanism for self-organization to occur in the hydrothermal systems of granite.

Cette thèse espère contribuer à l’histoire socio-culturelle du couple américain durant la période d’après-guerre. En discutant du récit national au travers d’aspects qui sont souvent considérés comme évident – génération, âge, situation géographique, individu et institution ainsi que cultures locales et nationales – ce travail essaie de nuancer ces définitions catégoriques qui en sont venues à représenter les années 1950 et 1960 tout comme l’ubiquité du discours sur la culture nationale. Le mariage, la famille, le genre, la sexualité, faire la cour (dating), les pratiques sexuelles et la culture des jeunes forment le cadre par lequel cette étude essaie d’éclairer la norme incarnée par le couple blanc, hétérosexuel, de classe moyenne. En introduisant deux villes du nord-ouest des Etats-Unis – Boise dans l’Etat d’Idaho et Portland dans l’Etat d’Oregon – dans une réflexion portant sur le récit national, cet essai tente d’élargir l’histoire locale de ces deux villes et de complexifier l’analyse des conventions sociales. L’histoire orale associée à des documents issus des archives d’universités locales et d’annuaires étudiants (yearbooks) ont permis à cette étude d’observer comment l’expérience d’américains « ordinaires » diffère et s’accorde avec le récit national dans des villes qui n’ont reçus que peu d’attention universitaire durant cette période et sur ces thèmes. Les informations des recensements, les documents et les discours politiques de l’époque étayent le modèle répandu d’un couple cent pour cent américain, alors que les films éducatifs, les livres de bonnes manières et les rubriques de chroniqueurs ont permis à ce travail d’explorer le processus au travers duquel cet idéal s’est imposé. Ce modèle connait un âge d’or pendant la « longue décennie » des années 1950. La mémoire collective nous dit qu’il constitue alors le dernier phare de la tradition familiale mais aussi peut-être son point de rupture. Cet essai défend l’idée que cet archétype n’était ni traditionnel ni catalyseur de bouleversements. Le couple blanc et hétérosexuel de classe moyenne était plutôt le point culminant de facteurs politiques, sociaux, économiques et culturels qui ont finalement ébranlés le couple « traditionnel », ce modèle ayant échoué à véritablement incarner les idéaux de la nation qu’il était supposé représenter. A la fin de la « longue décennie » des années 1950 cette norme représentait un statu quo, alors que les jeunes qui devaient perpétuer son héritage avaient consciemment et inconsciemment déjà commencé à saper ses fondations. / This thesis hopes to contribute to the postwar socio-cultural historiography on the American couple. In putting the national narrative into a discussion with some of its oft taken for granted aspects—generation, age, location, the individual and the institution, and local and national cultures—, this work attempts to provide nuance to the categorical definitions that have come to characterize the 1950s and the 1960s as well as the pervasiveness of the national culture’s voice. Marriage, family, gender, sexuality, dating, sexual activity, and youth culture are the framework through which this study has tried to elucidate the standard embodied in the white, middle-class, heterosexual couple. In incorporating two cities in the northwest United States—Boise, Idaho and Portland, Oregon—into a discussion about the national narrative, this dissertation tries to widen their local histories and complexify national convention. Oral histories paired with documents from the local universities’ archives and yearbooks have allowed for this work to look at how “average” Americans’ experiences differed from and coincided with the national narrative in places that have received very little scholarly attention on this time and these themes. Census data, scientific studies, political documents and speeches substantiate the pervasiveness of the “All-American couple,” while educational films, etiquette books, and advice columns have helped this thesis explore the process through which the ideal came into being. This model experienced a heyday during the long 1950s. Dominant memory tells us that either it was the last beacon of familial tradition or the breaking point for change. This dissertation contends that the archetype was neither traditional nor the catalyst for change. Rather the white, heterosexual middle-class couple was a culmination of political, social, economic, and cultural factors that ultimately undermined the “traditional” couple because it failed to truly embody the ideals of the nation it was purported to represent. By the end of the long 1950s, this model had become the status quo, but the young people who were to carry it into the future had consciously and unconsciously began chipping away at its foundations.

El objetivo de este trabajo es el desarrollo de técnicas para la simulación y optimización del diseño de circuitos osciladores y lazos de enganche en fase de microondas. La intención de estas técnicas es que puedan ser utilizadas por el diseñador para optimizar las prestaciones de este tipo de circuitos durante la etapa de diseño. Por este motivo, se ha intentado que en todo momento las técnicas puedan ser utilizadas en combinación con un programa comercial de simulación de circuitos de microondas.En el caso de los circuitos osciladores, inicialmente se han optimizado sus prestaciones cuando se utilizan como osciladores controlados por tensión. De esta forma, se han desarrollado una serie de técnicas que, en combinación con simulaciones en un programa comercial, permiten la linealización y extensión de la característica tensión-frecuencia. Mediante una técnica de control de estabilidad, se ha optimizado la respuesta dinámica del oscilador ante entradas variantes en el tiempo. En concreto, se ha aumentado la rapidez de respuesta eliminando transitorios lentos oscilantes que distorsionan la señal de salida deseada. Esta técnica se ha aplicado al caso particular de osciladores controlados por tensión utilizados para generar señales chirp, como puede ser en radares Frequency Modulated Continuos Wave (FMCW). Se ha analizado también el fenómeno del "injection-pulling", en el que una señal interferente desplaza la frecuencia de oscilación. Para ello, se ha desarrollado una formulación tipo transitorio de envolvente cuyos coeficientes pueden ser identificados mediante simulaciones de balance armónico en un simulador comercial. La técnica permite incrementar la robustez del circuito oscilador ante estas señales interferentes. Dados los problemas observados en el simulador comercial para simular la característica de ruido de fase en osciladores con estructuras acopladas, se ha desarrollado una técnica de simulación de ruido de fase que solventa estos problemas. La técnica obtiene la característica de ruido de fase a través de simulaciones de transitorio de envolvente en combinación con el uso de generadores auxiliares. Estas simulaciones pueden realizarse sin problemas usando un simulador comercial. Los resultados de todas las técnicas han sido corroborados mediante medidas en varios tipos de osciladores de microondas. Finalmente, se ha realizado un estudio preliminar para combinar el uso de series de Volterra con la técnica de transitorio de envolvente para la simulación de la respuesta transitoria de los osciladores.En el caso de los lazos de enganche en fase, se ha desarrollado un programa propio que realiza un análisis no lineal de lazos acoplados o "Coupled Phase-Locked Loops" (CPLL). Estos sistemas son utilizados en aplicaciones tales como en control de apuntamiento de antenas "phased-array". El programa, basado en una formulación tempo-frecuencial del sistema, permite la obtención de los rangos de operación del CPLL mediante una caracterización no lineal de los elementos que componen el lazo. Se delimitan los rangos de histéresis, y se analiza la variación de estos rangos en función de los parámetros del sistema. Se analiza la estabilidad de las soluciones estacionarias, teniendo en cuenta parámetros tales como el retardo del lazo. Mediante el control de la estabilidad y un análisis de tipo transitorio de envolvente, se optimiza la rapidez del sistema en el seguimiento de entradas moduladas. Finalmente, se analiza el ruido de fase, separando la perturbación en fase en distintas componentes. Esta separación permite clarificar el efecto del ruido en el control de apuntamiento de un array de antenas. Las predicciones de las técnicas han sido validadas mediante medidas en un sistema CPLL a 2 GHz. / The objective of this work is the development of techniques for the simulation and optimization of the design of microwave oscillator circuits and phase-locked loops. The intention of these techniques is that they can be used by the designer to optimize the features of these kinds of circuits during the design stage. For this reason, a lot of effort has been put along this thesis to ensure that the techniques can be used in combination with commercial microwave circuit simulators.In the case of the oscillator circuits, initially, their features have been optimized when used as voltage controlled oscillators (VCO). In this way, different techniques are proposed for the computer aided design of these circuits. The first technique allows setting the operation frequency band for specific values of the tuning voltage. The second technique imposes a linear frequency-voltage characteristic with the aid of an auxiliary generator. To follow this characteristic, the circuit is solved in terms of an ideal capacitance, synthesized, at a later stage, with the tuning varactor embedded in a linear network. In the third technique, the oscillator response to a sawtooth input, used to generate a chirp signal, is improved, eliminating spurious frequencies, not observable in steady state. To illustrate the techniques, a VCO operating in the C-band has been optimized and used to generate a chirp signal with low nonlinear frequency distortion. The injection-pulling phenomenon in oscillator circuits has been also analyzed. Injection pulling by interference signals is an undesired phenomenon in front-end oscillators, which causes a shift of the oscillation frequency and degrades the output spectrum. A semi-analytical formulation for the insightful analysis of injection-pulling phenomena in the presence of a modulated carrier or chirp signal is presented. The formulation enables an efficient analysis of interference problems difficult to simulate with harmonic balance or standard envelope transient. It allows the modification of the original design in order to reduce the injection pulling to the desired levels. The techniques have been applied to an oscillator at 6 GHz. Considering the problems found in commercial software to simulate the phase noise characteristic of coupled oscillator topologies, a numerical technique for the determination of the phase-noise spectrum of free-running oscillators is presented. The technique is based on envelope transient and can be applied to any commercial simulator on which this analysis method is available. The main advantage of the technique is that it allows simulating the near carrier phase noise spectrum, including possible resonances. The elements providing the oscillator phase-noise spectrum are obtained from envelope-transient simulations of low-computational cost. Comparisons are performed between the presented technique and other existing techniques, such as the carrier modulation approach. The technique has been successfully tested on the simulation of the near carrier phase noise spectrum of an oscillator circuit at 6.3 GHz. Finally, a preliminary study has been carried out to combine the use of Volterra series with the envelope transient technique for the simulation of oscillator transients.Regarding the phase-locked loops, in this thesis, harmonic-balance (HB) and envelope-transient formulations of coupled phase-locked loops (CPLLs) are presented. The CPLL has the added difficulty of its autonomous behavior since no reference oscillator is present. The new formulation takes into account the autonomy of the system, introducing a special set of state variables, which depend on the autonomous frequencies. The hysteresis phenomenon in CPLLs is analyzed in detail, efficiently obtaining the pull-in and hold-in ranges through HB. The pole analysis of the perturbed HB system enables an accurate prediction of instabilities and resonances. Due to the CPLL autonomy, there exists an inherent noise accumulation effect. This effect is taken into account, analyzing the perturbation in terms of accumulation and deviation components. The envelope formulation allows simulating the CPLL behavior in presence of modulation signals. The influence of the stability of the steady-state solution on the modulated signals is investigated. The simulation results have been successfully compared with the measurements in a manufactured CPLL system at 2 GHz.