38 research outputs found
Operation of Cs-Sb-O activated GaAs in a high voltage DC electron gun at high average current
No full textNegative Electron Affinity (NEA) activated GaAs photocathodes are the most popular option for generating a high current (>1 mA) spin-polarized electron beam. Despite its popularity, a short operational lifetime is the main drawback of this material. Recent works have shown that the lifetime can be improved by using a robust Cs-Sb-O NEA layer with minimal adverse effects. In this work, we operate GaAs photocathodes with this new activation method in a high voltage environment to extract a high current. We demonstrate that improved chemical resistance of Cs-Sb-O activated GaAs photocathodes allowed them to survive a day-long transport process from a separate vacuum system using a vacuum suitcase. During beam running, we observed spectral dependence on lifetime improvement. In particular, we saw a 45% increase in the lifetime at 780 nm on average for Cs-Sb-O activated GaAs compared to Cs-O activated GaAs. © 2022 Author(s)
Trophic Interactions And The Efficacy Of Milfoil Weevils For Biocontrol Of Eurasian Watermilfoil In Wisconsin Lakes
No full textEurasian water-milfoil (Myriophyllum spicatum L., henceforth “EWM”) is the most heavily managed nuisance submersed aquatic plant in the United States. EWM’s rapid spring growth and formation of dense surface mats inhibits native macrophyte communities, serves as poor-quality habitat for fish and macroinvertebrates, impacts recreation, and can clog water supply infrastructure. The milfoil weevil (Euhrychiopsis lecontei Dietz) has been associated with EWM declines in several states, though natural weevil densities are generally too small to effect control. Augmentative biocontrol has had varied success and fish predation may account for high weevil mortality. Weevils were augmented in 4 northern Wisconsin lakes in summer 2013. In summer 2014, I collected invertebrates associated with EWM plus 442 bluegill (Lepomis macrochirus Rafinesque) diet samples from the 4 study lakes. Overall, chironomids and oligochaetes were the dominant invertebrates associated with plants, while chironomids and Daphnia spp. constituted up to 27.2% and 24.0% of the fish diets, respectively. Milfoil weevils were found in 2.9% of diet samples examined. Weevil larvae were preyed upon more frequently than adults (94.2% of weevils consumed) and sometimes occurred in high numbers within single diet samples. Since the larval stage contributes the most to EWM damage, selective predation on this stage may limit its use as a control agent
New Growth, New Power
No full text106p.The author uses the theories of Wendell Berry and Justin Maxson to focus on the historical, social, and environmental issues surrounding the natural resources of Kentucky. According to the author, the Appalachian forest has been poorly managed for generations; its trees have been repeatedly extracted over the past half century and a half. Despite this abuse, the forest and its resources are uniquely positioned to play a key role in building a diverse, resilient, and restorative Appalachian economy
A Question of Online Instructional Priorities among Administrators, Faculty, and Students
No full textAuthor Abstract:
This study explored the differences in expectations between administrators, full-time residential faculty members, online adjunct faculty members, and online students related to online instructional behaviors at Olivet Nazarene University. No prior study had been identified that compared the online instructional priorities of these groups. The results indicated that full-time faculty (M = 4.29), not adjuncts (M = 4.55), had the lowest priorities for online instructional behavior, that adjunct faculty members’ perceptions aligned with administrator priorities on 25 of the 29 items, and that past experience does correlate with priorities in all groups except for adjunct faculty. An implication of the study is that specialization in the online delivery modality may have more impact on quality instruction than faculty status as full-time or adjunct
Kimono exhibit catalog
No full textCatalog of "Kimono" exhibit, running from March 29 to May 31, 1990 at the Gustafson Gallery. Catalog contains information of kimonos displayed in the exhibit
Review of Cultures of Charity: Women, Politics, and the Reform of Poor Relief in Renaissance Italy
No full textThe author uses a thematic approach to argue that Bologna was a trensetter in approaches and institutions aimed at helping the poor between roughly 1450-1700
A field test on the effectiveness of milfoil weevil for controlling Eurasian watermilfoil in Wisconsin lakes
No full textReview of Niccolò Machiavelli: An Intellectual Biography
No full textThe author offers a comprehensive analysis of the thought of Machiavelli situated against the backdrop of political and biographical developments in the early 16th century
A Question of Online Instructional Priorities Among Administrators, Faculty, Adjunct Faculty, and Students
No full textEthical Leadership Colloquium
Members of the Ed.D. Class of 2016-17, Cohort XII
Author Abstract:
This study explored priorities for online instructional behavior in post-traditional programs at Private Christian University (PCU). No prior study had been identified that compared the online instructional priorities among four groups: administrators (n = 25), full-time faculty (n = 73), adjunct faculty (n = 69), and students (n = 321). This study would benefit those who oversee online instructional standards or who operate online adjunct faculty development programs. Quantitative research was conducted using a survey instrument to answer the three research questions. First, a Welch’s variant of the analysis of variance (ANOVA) and a Bonferroni post hoc test was conducted to analyze the differences in expectations for online instructional behavior that existed among the four groups. Second, a t-test for independent means was used to analyze how adjunct faculty members’ perception of administrator priorities aligned with actual administrator priorities. Third, a Pearson product-moment correlation was used to understand the relationship of past experience with online learning and one’s current priorities for online instructional behavior. The statistically significant results indicated that full-time faculty (M = 4.29), not adjuncts (M = 4.55), had the lowest priorities for online instructional behavior, that adjunct faculty members’ perceptions aligned with administrator priorities on 25 of the 29 items, and that past experience does correlate with priorities in all groups except for adjunct faculty. An implication of the study is that specialization in the online delivery modality may have more impact on quality instruction than faculty status as full-time or adjunct
Hospitals, British, French, and American. To which is appended, A glance at the British Islands, France, and America. Ethnological, climatic, and general.
No full textMode of access: Internet
