Optimization of Broken Rice Consumption through Understanding the Confluence of Sensory and Economic Preferences

The authors were perplexed by the seeming dichotomy between the majority 70% of Haitian consumers being chronically food insecure, but still preferring to pay premium international market prices for long-grain rice that constitutes 30% of the calories in this poorest nation in the Western Hemisphere. The aim of this study was to determine the optimal percent broken rice in regards to price specifically to Haiti. Optimization between quality and price point is seen as the best rice for the price, and can be found through combining individual preferences with willingness to pay. Broken rice (brokens) garner a significantly discounted price compared to the whole grains, despite offering very similar, if not the same or better, nutritional quality. Through analyzing rice samples with concurrent surveys from 300 Haitians, we were able to determine that brokens have a relatively small effect on consumer preferences in Haiti. This indicted that less strict import standards on broken percentage of rice could benefit the welfare of Haitians in need of discounted food supply. To supplement these findings, a sensory study in the University of Arkansas Sensory Service Center was conducted with the aim of determining brokens’ impact on rice consumers both pre-purchase and post-cooking. Broken rice is sold at a significant discount worldwide, and this study aimed at understanding why that discount persists and if the discounts perpetuated by producers are aligned with consumers’ willingness to purchase broken rice. Through testing rice-eating consumers’ perception of the same rice samples in their raw and cooked forms with percentage broken being the only independent variable (in incremental percentages of 5%, 10%, 20%, 30%, and 40%), the results showed that the raw rice’s appearance with high levels of brokens is disproportionately affecting the broken rice marke

Did Money Matter? Interpreting the Effect of Displayed Wealth on Social Relations within an Enslaved Community

Social relationships structure daily life in a startling, and important, variety of ways. However, when considering the social world that existed inside slave quarters across the Virginia Piedmont (and the Antebellum South), archaeologists have not been able to come to a clear consensus on how to approach the study of social networks; with some researchers focusing on social standing, seen most often through the role of material wealth to create connections, and others focusing on how interactions can be meaningfully interpreted from the archaeological record. This thesis represents an attempt to bridge these two theoretical stances, by looking to see if, in fact, wealth mattered in the social relationships within the black community at Virginia’s Montpelier plantation. By comparing the amount of costly consumer goods owned by the residents of three sites to the evidence for their social interaction with their neighbors, including gift giving, participation in intra-plantation economies, and involvement in the local spiritual community, it appears as if the amount of wealth a household displayed did not affect their social relationships within the enslaved community. Rather, a complex, overlapping, web of identity and belonging likely shaped who the women and men at Montpelier formed social connections with, and the degree these various connections mattered in their lives: influenced by, amongst other factors, gender, where these African Americans called home, and who they were “kin” to

ASSEMBLING ENSLAVED LIVES: LABOR, CONSUMPTION, AND LANDSCAPES IN THE NORTHERN SHENANDOAH VALLEY

This dissertation is a study of the lives of some of the people enslaved on rural plantations and farmsteads in the northern Shenandoah Valley region of Virginia. Scholars did not widely acknowledge the presence of slavery in the Valley before the 1990s, and this is the first work to provide an in-depth view of the lives of enslaved Shenandoahans before 1860. Specifically, this project answers two questions: what was life like for enslaved people in the Shenandoah Valley, and how did they shape the region\u27s political economies. Data for this project comes from archaeological excavations at the main enslaved quartering site at Belle Grove Plantation and 19th-century written sources from Frederick and Shenandoah Counties, Virginia, and Jefferson County, West Virginia. Using these sources, this dissertation assesses 1) the impact grain agriculture had on enslaved people and the economic impact of enslaved farmers, 2) the food rations issued to enslaved Shenandoahans and the ways they grew, gathered, raised, and hunted at night and on Sundays to ensure their families had enough to eat, 3) how restrictions on enslaved people’s consumption practices limited their ability to travel to, and buy goods from, cities, towns, and country stores, 4) the ways enslaved people used imported tea and tablewares and locally-made utilitarian ceramics to make lives for themselves, and the larger economic implications of these actions, and 5) the struggles between enslaved Shenandoahans and their enslavers that took place through local landscapes. In addition to its contribution to Shenandoah Valley history, this dissertation proposes new ways of theorizing archaeological research on enslaved life that draws heavily from assemblage thinking and Black studies, focusing on ontological politics through which how enslavers defined enslaved people as a different type of human than themselves and enslaved people redefined their humanities on their own terms

THE EFFECT OF MOISTURE CONTENT AND COMPOSITION ON THE COMPRESSIVE STRENGTH AND RIGIDITY OF COB MADE FROM SOIL OF THE BRECCIA MEASURES NEAR TEIGNMOUTH, DEVON

Earth has been used as a reliable building material for many thousands of years. Recently there has been a world wide renaissance in the use of earth as a building material due to its architectural versatility and environmental sustainability. However, in the United Kingdom it is regarded by the majority of building professionals as either obsolete or a novel historical material. The utilisation of earth as a modern building material and the repair of historic earth building structures is retarded by the uncertainty of the knowledge of the properties of the material. This thesis considers earth building materials as composite materials containing a cohesive, low compression modulus binder fraction, a high compression modulus aggregate fraction, and a fibre fraction. The compression properties of a building material without fibre content (cob matrix material) are described in terms of the interaction between the binder and aggregate fractions, and moisture and the binder fraction. The effect of the moisture content of the material upon the compression failure mechanisms is described. Values of compression modulus predicted by a rule of mixtures equation are compared to experimental results for this material. The following mechanisms are proposed to account for the apparent discrepancy between the predicted and experimental results: • the effect of pore size distribution and the proportions of binder and aggregate fractions upon strain magnification within the material • the effect of an efficiency factor, primarily dependent upon the proportion of binder and aggregate fractions, which determines the degree to which the potential modulus of the material is realised. Time Domain Reflectometry is employed for repeated, real time, non destructive measurement of the moisture content of an external cob wall. The results of these measurements are analysed and discussed. This thesis proposes that consideration of cob as a composite material has developed a paradigm which will enhance the level of understanding of all earth building materials, enabling the manipulation and accurate prediction of their structural properties. This will be an important contribution to the realisation of the significant sustainable qualities of earth building materials by the current construction industry

Applying a Mt. Mazama Volcanic Ash Treatment as a Trail Accessibility Improvement

A procedure has been developed for implementing a topically applied Mt. Mazama volcanic ash trail surface amendment for improving trail firmness and stability. This project involved implementation of previously conducted Mt. Mazama volcanic research by applying a Mazama Ash and Portland Cement solution over a 0.2-mile section of the Geo Trail at the Oregon Institute of Technology Klamath Falls campus. Testing was performed to verify ideal Ash-to-Cement-to-Water ratios. A procedure was developed and applied for batching and mixing the dry materials on-site, spreading and integrating the dry material with the existing trail surface, and wetting and compacting the surface. After the pilot application, visual inconsistencies were observed in the treated trail surface. Firmness and stability were measured at different locations along the treated trail surface and on the untreated surface with a rotational penetrometer apparatus. Roughness was quantified using a modified Wheelchair Pathway Roughness Index at different locations along the treated rail surface and on the untreated surface. At each of the testing locations on the treated surface, stability was shown to have improved, firmness was relatively consistent, and the ability to roll an occupied wheelchair without rutting was markedly improved

Computationally Efficient Self-Tuning Controller for DC-DC Switch Mode Power Converters Based on Partial Update Kalman Filter

In this paper, a partial update Kalman Filter (PUKF) is presented for the real-time parameter estimation of a DC-DC switch-mode power converter (SMPC). The proposed estimation algorithm is based on a novel combination between the classical Kalman filter and an M-Max partial adaptive filtering technique. The proposed PUKF offers a significant reduction in computational effort compared to the conventional implementation of the Kalman Filter (KF), with 50% less arithmetic operations. Furthermore, the PUKF retains comparable overall performance to the classical KF. To demonstrate an efficient and cost effective explicit self-tuning controller, the proposed estimation algorithm (PUKF) is embedded with a Bányász/Keviczky PID controller to generate a new computationally light self-tuning controller. Experimental and simulation results clearly show the superior dynamic performance of the explicit self-tuning control system compared to a conventional pole placement design based on a pre-calculated average model

Real-time parameter estimation of DC-DC converters using a self-tuned kalman filter

To achieve high-performance control of modern dc-dc converters, using direct digital design techniques, an accurate discrete model of the converter is necessary. In this paper, a new parametric system identification method, based on a Kalman filter (KF) approach is introduced to estimate the discrete model of a synchronous dc-dc buck converter. To improve the tracking performance of the proposed KF, an adaptive tuning technique is proposed. Unlike many other published schemes, this approach offers the unique advantage of updating the parameter vector coefficients at different rates. The proposed KF estimation technique is experimentally verified using a Texas Instruments TMS320F28335 microcontroller platform and synchronous step-down dc-dc converter. Results demonstrate a robust and reliable real-time estimator. The proposed method can accurately identify the discrete coefficients of the dc-dc converter. This paper also validates the performance of the identification algorithm with time-varying parameters, such as an abrupt load change. The proposed method demonstrates robust estimation with and without an excitation signal, which makes it very well suited for real-time power electronic control applications. Furthermore, the estimator convergence time is significantly shorter compared to many other schemes, such as the classical exponentially weighted recursive least-squares method