Wayne E. Sabbe Arkansas Soil Fertility Studies 2017

Rapid technological changes in crop management and production require that the research efforts be presented in an expeditious manner. The contributions of soil fertility and fertilizers are major production factors in all Arkansas crops. The studies described within will allow producers to compare their practices with the university’s research efforts. Additionally, soil-test data and fertilizer sales are presented to allow comparisons among years, crops, and other areas within Arkansas

Being, doing, and play: A theoretical and clinical exploration

This paper explores the metonymy of the following aphorism, delivered by Winnicott in a 1967 lecture: “From being comes doing, but there can be no do before be.” (1970, p. 25, emphasis in original). This aphorism has been little discussed or explored in the literature, but Winnicott articulated similar ideas in his more academic papers (e.g., 1965, 1970). These similar communications about being and doing will be examined alongside more contemporary thinking about the ideas to which Winnicott alludes in this aphorism; works by Benjamin (1988) and Akhtar (2000) in particular will be brought to bear on the subject. Two case studies will then be discussed, in order to examine the clinical implications of the theoretical discussion. Ultimately, such exploration will substantiate the claim that, through the metonymy of being and doing, Winnicott was alluding to a “statement of human nature” that he published just 3 years later (1970, p. 2). Winnicott’s own concept of play will then be posited as a critical, third element comprising “the life of a human being,” which will serve to situate the discussion within a contemporary, relational framework (1970, p. 2)

Wayne E. Sabbe Arkansas Soil Fertility Studies 2018

Rapid technological changes in crop management and production require that the research efforts be presented in an expeditious manner. The contributions of soil fertility and fertilizers are major production factors in all Arkansas crops. The studies described within will allow producers to compare their practices with the university’s research efforts. Additionally, soil-test data and fertilizer sales are presented to allow comparisons among years, crops, and other areas within Arkansas

Price Barriers in the Stock Market and Their Effect on the Black-Scholes Option Pricing Model

The predicted price of an American option by the Black-Scholes (B-S) Option Pricing Model is known to differ from the market price of that option systematically with respect to time to expiration, distance in- or out-of-the-money, and liquidity of the option. We examine the possibility of price barriers in the stock market causing further systemic pricing differences between the market price and B-S predicted price. These differences occur when an option’s strike price is near a price barrier and differ in effect and significance depending on the position of the barrier relative to the underlying stocks’ price. We find round number price barriers in the stock market are beginning to be internalized into the option market. Additionally, Bollinger bands and Gann levels appear to receive special attention from investors, but do not act as price barriers

Deployment of Keystroke Analysis on a Smartphone

The current security on mobile devices is often limited to the Personal Identification Number (PIN), a secretknowledge based technique that has historically demonstrated to provide ineffective protection from misuse. Unfortunately, with the increasing capabilities of mobile devices, such as online banking and shopping, the need for more effective protection is imperative. This study proposes the use of two-factor authentication as an enhanced technique for authentication on a Smartphone. Through utilising secret-knowledge and keystroke analysis, it is proposed a stronger more robust mechanism will exist. Whilst keystroke analysis using mobile devices have been proven effective in experimental studies, these studies have only utilised the mobile device for capturing samples rather than the more computationally challenging task of performing the actual authentication. Given the limited processing capabilities of mobile devices, this study focuses upon deploying keystroke analysis to a mobile device utilising numerous pattern classifiers. Given the trade-off with computation versus performance, the results demonstrate that the statistical classifiers are the most effective

Reassessing the Source of Long-Period Comets

We present numerical simulations to model the production of observable long-period comets (LPCs) from the Oort Cloud, a vast reservoir of icy bodies surrounding the Sun. We show that inner Oort Cloud objects can penetrate Jupiter's orbit via a largely unexplored dynamical pathway, and they are an important, if not the dominant, source of known LPCs. We use this LPC production to place observationally motivated constraints on the population and mass of the inner Oort Cloud, which are consistent with giant planet formation theory. These constraints indicate that only one comet shower producing late Eocene bombardment levels has likely occurred since the Cambrian Explosion, making these phenomena an improbable cause of additional extinction events.Comment: Originally published in Science (9/4/09), 30 pages, 9 figures, main article and online material combine

A Hedonic Model for Housing Prices in Wilsonville, Oregon

We estimate a hedonic model for housing prices in Wilsonville, Oregon. Our data for 197 houses is drawn from Zillow for 2014 to 2017. We find that the number of bedrooms, the square footage of the house, and whether the house is single level are statistically significant factors affecting housing prices. Location variables are also found to be statistically significant. As an example, the price of a house on the Charbonneau Golf Course is estimated to be 15% higher than the price of a house located elsewhere in Wilsonville

The Formation of the Oort Cloud in Open Cluster Environments

We study the influence of an open cluster environment on the formation and current structure of the Oort cloud. To do this, we have run 19 different simulations of the formation of the Oort Cloud for 4.5 Gyrs. In each simulation, the solar system spends its first 100 Myrs in a different open cluster environment before transitioning to its current field environment. We find that, compared to forming in the field environment, the inner Oort Cloud is preferentially loaded with comets while the Sun resides in the open cluster and that most of this material remains locked in the interior of the cloud for the next 4.4 Gyrs. In addition, the outer Oort Cloud trapping efficiencies we observe in our simulations are lower than previous formation models by about a factor of 2, possibly implying an even more massive early planetesimal disk. Furthermore, some of our simulations reproduce the orbits of observed extended scattered disk objects, which may serve as an observational constraint on the Sun's early environment. Depending on the particular open cluster environment, the properties of the inner Oort Cloud and extended scattered disk can vary widely. On the other hand, the outer portions of the Oort Cloud in each of our simulations are all similar.Comment: 65 pages, 14 figures, 3 tables, Accepted to Icaru