The capability of CFD is assessed by utilizing CFDShip-Iowa V4.5 for the prediction of the 6DOF motion responses, forces, moments and the local flow field of the 2.7m KCS model in various weather/operating conditions. The discretized propeller is preferred and the rudder is designed to be active up to ±35 degrees. Grid triplets are generated with the refinement ratio √2 and verification is achieved for the resistance and propeller open water tests while for the other tests is only partially fulfilled. The verification shows unsmooth convergence, however, the errors from grid triplets are small. The propeller open water test validates the performance of the discretized propeller successfully. The free decay tests could predict reasonable heave/pitch/roll natural frequencies. The resistance test verifies the nominal wake distribution. The self-propulsion test using discretized propeller shows 18% higher propeller inflow and 0.1 thrust deduction factor compared to resistance test. A propeller blade that sweeps the starboard experienced higher thrust inducing non-axisymmetric propeller wake and thus affecting the angle of attack of the rudder. Neutral rudder angle diminishes effective angle of attack and keeps the course straight. Maneuvering simulations could predict qualitatively good agreement for validation variables while the trajectory needs more improvement. Using the discretized propeller for the head/oblique wave course-keeping simulations achieved validation successfully. The RAO of added thrust, torque and propeller rotational speed resembles the RAO of added-resistance except showing larger values during long waves. The mean propeller efficiency is at the minimum when the ship experiences a resonance. The first harmonic amplitude of the propeller efficiency increases followed by the increase of the wavelength.

No description available.

Soil development on upland landscapes in east-central Iowa Peoria Loess deposits has been occurring for approximately the last 12,500 years. Weathering zone and pedogenic processes depend on environmental factors such as climate, precipitation, time, parent material, biota, and topography, among others. Analyzing the weathering zones of modern and paleosol profiles provides insight into current and paleo-environmental processes. This study employs several bulk geochemical analytic techniques (XRF, pXRF, LIBS, ICP-MS) to examine the weathering profiles formed in modern Peoria Loess deposits and underlying weathering profiles formed during the Farmdale Interstadial and the Sangamon Interglacial. Results indicate advanced weathering occurred in the paleosol sequences of the Farmdale and Sangamon compared to the modern weathering zone, based on depletion and enrichment of elemental concentrations. The interstadial/last interglacial paleosol weathering profiles exhibit increased depletion in CaO, MgO, Na2O, and K2O compared to the Holocene weathering profile formed in Peoria Loess. Enrichment of CaO and MgO in non-pedogenically altered Peoria Loess deposits is a possible indication of rapid loess accumulation, representing insufficient weathering of deposited material synchronous with deposition. Post-depositional weathering and hydrogeological mechanisms may also account for this mid-profile enrichment, providing for some complexity for interpretation. Regional comparison between three sediment cores - an agricultural field, a restored prairie and a pioneer cemetery - exhibit minor land-use influence on geochemical evolution with the agricultural field core exhibiting greater relative depletion in most oxides in the upper one meter, compared to the other sediment cores. However, slight regional heterogeneity in parent material, vegetation cover, and slope position may also account for geochemical variations. Therefore, it is difficult to conclude how the last 150 years of extensive land-use from human activity has impacted weathering and pedogenesis in this region. Additionally, this study validates using pXRF technology on Quaternary weathering profiles, and documents its technological shortcomings which provides essential information for drawing interpretations from these data.

Quilts are a unique medium that is deeply layered with meaning, highly gendered, intimately tied to social and cultural communities, and richly interdisciplinary. Though quilts are utilitarian in origin, their circulation and display take them far beyond the home--to art galleries, history museums, state fairs, quilt shows, and philanthropic auctions. As they move, individuals and institutions make significant intellectual and emotional investments in how quilts are classified, judged, and valued. In this highly politicized work, individuals and institutions shape public culture through debates about quilts' utility, workmanship, and aesthetics; they create and display quilts to further their cultural heritage, manifest their faith, delineate aesthetic values, reinforce disciplinary boundaries, and elevate their artistic status. This project uses four representative case studies to demonstrate the cultural work that women and institutions conduct using quilts and to explore what is at stake in that work. Through research into the Iowa State Fair quilt competition and the Michiana Mennonite Relief Sale Quilt Auction, I reveal how women employ their quilts and quilt displays to promulgate their values and shape their communities. In case studies of larger institutions--the Smithsonian Institution and the American Quilter's Society--I investigate how quilts intersect with other artistic and historic objects in their creation, interpretation, and display. Each chapter includes historical research, observations from site visits, and evidence from qualitative interviews--research that provides a historical view of each institution and an analysis of how they currently categorize, judge, and display quilts. Together, these case studies reveal that individual efforts at quilt display intersect in broader public culture, where conversations about how to value and interpret quilts are also essential conversations about aesthetics, community values, disciplinarity, and the value of women's work.

This thesis quantitatively and qualitatively analyzes the economic regulations that govern taxicab firms in Iowa City, Iowa. Based upon a review of the relevant literature, an economic analysis of regulations and market power, and conducted interviews among taxicab owners and drivers, city staff and planners, and members of the general public, this paper will analyze the costs and implications of economic regulations and risks of regulatory capture, and identify improvements to existing ordinances and city codes. Current economic theory argues that economic regulations create both real and perceived entry barriers, and impose costs to producers and consumers. Additionally, these regulations stifles entrepreneurship and innovation, reduces driver pay, and in some instances leads to discrimination and encumbrance for the most vulnerable residents, recent immigrants and the car-less poor. On the question of whether economic regulations causes high concentrations of market power in U.S. cities, regression analysis of medium to large U.S. cities does not reveal a correlation between entry regulation and market power. Additionally, calculations of the Herfindahl (HH) Index for taxi firms in Iowa City yields a HH score of 0.103052, which is considered an un-concentrated market. However, while the quantitative data indicates that economic regulations do not cause an identifiable influence on market power, qualitative data gathered from stakeholder interviews reveal a burden in the form of unavoidable sunk costs for drivers, owners, and riders. These interviews reveal the "true" costs of regulations, as well as the perceived costs by policy makers, regulators, and the general public, who frequently underestimate the burden of regulation. This thesis further highlights how regulations arise in the policy-making process; and to what extend they stem from either anti-competitive interests between established firms, a lack of information among policymakers, or simply planners' failure to integrate taxis into a more comprehensive regional transportation system. Ultimately this thesis argues that some of Iowa City's taxicab regulations, particularly the liability insurance minimums for drivers, the terms of operation for dispatching, and the profiling of immigrant and small firm cabbies by ICPD are burdensome and unnecessary. Loosening of these restrictions would benefit small firm and drivers, the general consumer of taxi services, and compliment larger city planning goals in Iowa City, Iowa. Despite the costs and burdens, this thesis does not justify complete deregulation for Iowa City's transportation policy, particularly when case studies of such efforts have not always yielded positive benefits. Instead, this thesis advocates for "better regulation", to be enforced on a regional level, rather than at a municipal level.

Frontal electroencephalographic (EEG) alpha (α) asymmetry may index the activation of lateralized affect and motivation systems in humans. Resting EEG activation was measured and its relationship to Iowa gambling task (IGT) performance was evaluated. No effects were found for α power asymmetry. However, beta (β) power asymmetry, an alternative measure of resting EEG activation, was associated with the number of risky decisions made in the early portion of the task. Additionally, IGT deck selection patterns suggest there are at least three distinct performance styles in healthy individuals. Interestingly, β power asymmetry contradicts performance predictions based on accepted frontal asymmetry affect and motivation models.

Humans have a tendency to engage in economically irrational behaviors such as gambling, which typically leads to long-term financial losses. While there has been much research on human gambling behavior, relatively little work has been done to explore the evolutionary origins of this behavior. To examine the adaptive pressures that may have led to this seemingly irrational behavior in humans, nonhuman primates were tested to explore their reactions to gambling type scenarios. Several experiments based on traditional human economic experiments were adapted for use with a wider variety of primate species including chimpanzees and capuchin monkeys. This allowed for testing multiple species using similar methodologies in order to make more accurate comparisons of species abilities. This series of tasks helps to elucidate risky decision-making behavior in three primate species.

Thesis (D. Min.)--Midwestern Baptist Theological Seminary, 2008. / Abstract. Includes bibliographical references (leaves 120-125)

Project (D. Min.)--Trinity Evangelical Divinity School, 1982. / Abstract. Includes bibliographical references (leaves 157-161).

Thesis (D. Min.)--Midwestern Baptist Theological Seminary, 2002. / Abstract. Includes bibliographical references (leaves 182-187).