Prescribed Fire

As the culmination of my nonfiction seminar (ENGL 470C) with Professor Colin Rafferty, I chose to explore three disparate, but interwoven, narratives: the death of and delayed grief over my high school mentor; my struggle with Obsessive Compulsive Disorder; and, the 2011 wildfire that destroyed much of the Great Dismal Swamp. Through a use of segmentation, lyric language, and a manipulation of tense, I explore the tensions underlying these narratives, namely the idea of futility of preparation and the insistence on destructive cycles which sustain themselves. Ultimately, the essay serves on a rumination not on mortality, but on our cultural perception of it as something to be dealt with in the aftermath and the difficulty that subsequently arises from when that perception is flipped and, instead, an end is something to be eternally anticipated and negotiated within that anticipation

Spaceborne CO2 laser communications systems

Projections of the growth of earth-sensing systems for the latter half of the 1980's show a data transmission requirement of 300 Mbps and above. Mission constraints and objectives lead to the conclusion that the most efficient technique to return the data from the sensing satellite to a ground station is through a geosynchronous data relay satellite. Of the two links that are involved (sensing satellite to relay satellite and relay satellite to ground), a laser system is most attractive for the space-to-space link. The development of CO2 laser systems for space-to-space applications is discussed with the completion of a 300 Mpbs data relay receiver and its modification into a transceiver. The technology and state-of-the-art of such systems are described in detail

Mule Deer Impede Pando’s Recovery: Implications for Aspen Resilience from a Single-Genotype Forest

Aspen ecosystems (upland Populus-dominated forests) support diverse species assemblages in many parts of the northern hemisphere, yet are imperiled by common stressors. Extended drought, fire suppression, human development, and chronic herbivory serve to limit the sustainability of this keystone species. Here we assess conditions at a renowned quaking aspen (Populus tremuloides) grove—purportedly the largest living organism on earth—with ramifications for aspen biogeography globally. The “Pando” clone is 43 ha and estimated to contain 47,000 genetically identical aspen ramets. This iconic forest is threatened in particular by herbivory, and current management activities aim to reverse the potential for type conversion, likely to a non-forest state. We set out to gauge agents affecting recent deterioration through a network of monitoring plots and by examining a chronosequence of historic aerial photos to better understand the timing of putative departure from a sustainable course. Sixty-five permanent forest monitoring plots were located in three management regimes existing within Pando: no fencing, fencing with active and passive treatments, fencing with passive-only treatment. At each sample plot we measured live and dead mature trees, stem recruitment and regeneration, forest and shrub cover, browse level, and feces counts as a surrogate for ungulate presence. Ordination results indicate that aspen regeneration was the strongest indicator of overall forest conditions at Pando, and that mule deer (Odocoileus hemionus) presence strongly impacts successful regeneration. Additionally, fencing with active/passive treatments yielded the most robust regeneration levels; however, a fence penetrable by ungulates in the passive-only treatment most likely played a role in this outcome. The aerial photo sequence depicts various human intrusions over the past seven decades, but perhaps most telling, a decline in self-replacement beginning 30–40 years ago. Aspen communities in many locations in North American and Europe are impacted by unchecked herbivory. The Pando clone presents a unique opportunity for understanding browse mechanisms in a forest where tree genotype, closely aligned with growth and chemical defense, is uniform

Trust and Risk Relationship Analysis on a Workflow Basis: A Use Case

Trust and risk are often seen in proportion to each other; as such, high trust may induce low risk and vice versa. However, recent research argues that trust and risk relationship is implicit rather than proportional. Considering that trust and risk are implicit, this paper proposes for the first time a novel approach to view trust and risk on a basis of a W3C PROV provenance data model applied in a healthcare domain. We argue that high trust in healthcare domain can be placed in data despite of its high risk, and low trust data can have low risk depending on data quality attributes and its provenance. This is demonstrated by our trust and risk models applied to the BII case study data. The proposed theoretical approach first calculates risk values at each workflow step considering PROV concepts and second, aggregates the final risk score for the whole provenance chain. Different from risk model, trust of a workflow is derived by applying DS/AHP method. The results prove our assumption that trust and risk relationship is implicit

Effects of Culture Conditions on the Lipid Composition of Acinetobacter sp. NCIB 8250

1. This thesis describes the effects of a wide variety of growth conditions on the wax ester content and composition of Acinetobacter sp. NCIB 8250. It also describes the effects of these different growth conditions on the fatty acid composition of both the wax esters and the phospholipids found in this bacterium. 2 When Acinetobacter sp. NCIB 8250 was grown in continuous culture at 3

The Relationship Between Summer Camp Employment and Emotional Intelligence

Camping professionals have long claimed that summer camp employment provides camp staff with a number of benefits. The summer camp staff experience has been shown to have a positive effect on the staff members\u27 personal, social and emotional growth (Bialeschki, Henderson, & Dahowski, 1998; DeGraff & Glover, 2002). Yet, some influentia. others such as parents and human resources professionals have questioned the wisdom of a college student spending a summer of fun in the sun , working at a summer camp for low pay. The concept of emotional intelligence has been recently gaining favor in the human resource management arena, and it may be a:fruitful concept to apply to the potential benefit of summer camp employment. Emotional intelligence refers to a \u27type of·social intelligence that involves the ability to monitor one\u27s own and others\u27 emotions, to discriminate among them, and to use the information to guide one\u27s thinking and actions (Mayer & Salovey, 1993, p. 433). The purpose of this study was to identify how the summer camp experience impacts staff members and to better understand if emotional intelligence is developed through summer camp employment

Evolutionary instability of selfish learning in repeated games

Across many domains of interaction, both natural and artificial, individuals use past experience to shape future behaviors. The results of such learning processes depend on what individuals wish to maximize. A natural objective is one’s own success. However, when two such “selfish” learners interact with each other, the outcome can be detrimental to both, especially when there are conflicts of interest. Here, we explore how a learner can align incentives with a selfish opponent. Moreover, we consider the dynamics that arise when learning rules themselves are subject to evolutionary pressure. By combining extensive simulations and analytical techniques, we demonstrate that selfish learning is unstable in most classical two-player repeated games. If evolution operates on the level of long-run payoffs, selection instead favors learning rules that incorporate social (other-regarding) preferences. To further corroborate these results, we analyze data from a repeated prisoner’s dilemma experiment. We find that selfish learning is insufficient to explain human behavior when there is a trade-off between payoff maximization and fairness