1,843 research outputs found
Sub-micron scale conduction processes on clean surfaces
Fundamental electrical conductance measurement has been studied in-situ in two dimensions in the Ag/Si(111) system as a function of the incident adatom flux rate with a four probe technique. A conductance study in a three dimensional conical structure was also carried out with field emission techniques. Field emission is now well established and has been used in this case to characterize a novel geometry for use in flat panel displays to replace cathode ray tube monitors. For the two dimensional study on Ag/Si(111), the origin of conduction is still unclear, as both transport by means of percolating Ag clusters and conduction through the substrate via electrons transferred from the film have both been suggested as the conduction mechanism. We have carried out experiments by varying the flux rate to decide between these two possible mechanisms. Smoother films are expected at lower growth rates which would result in faster drops in the four probe voltage. However, the four probe voltage vs. deposition time for various flux rates collapse into a universal curve which indicates that the morphology is not relevant and supports conduction through the substrate. In the conductance measurements in the three dimensional system, a single, lateral micromachined W protrusion on a silica substrate is examined to identify the factors controlling emission in micromachined structures. The I-V characteristics and emission pattern indicate that miniprotrusions of a few hundred Angstroms, much smaller than the nominal radius of the tip, exist on the tip and are responsible for the emission. Adsorption-desorption events from the background environment are the cause of large fluctuations in the emitting current. Comparison of the emission of a single tip to gated arrays suggest that only a fraction of the tips in the array are emitting
Giving Faculty A Public Voice: Higher Education Must Incentivize its Faculty to Publicly Disseminate their Ideas
This paper considers higher education’s response to fake news to be a responsibility to more effectively communicate its ideas to the general public. Considering how the changing information landscape cultivates and interprets knowledge increasingly with less and less academic involvement, the issue of a post-truth world renders it more necessary than ever for higher education to be an active participant in public discourse. Further, this paper acknowledges the difficulties of doing so and advocates providing career incentives to faculty to take up this challenge. Current incentives reward self-referential discourse within academia, but given the changing times it is crucial for both higher education institutions and the public at large to accommodate an expanded role for taking on the new challenges posed by fake news
\u3cem\u3eContesting Communities: The Transformation of Workplace Charity.\u3c/em\u3e Emily Barman.
Book note for Emily Barman. Contesting Communities: The Transformation of Workplace Charity. Stanford, CA: Stanford University Press, 2006. 20.95 papercover
Disseminated Neonatal Herpes Caused by Herpes Simplex Virus Types 1 and 2
Disseminated neonatal herpes simplex virus (HSV) infection is characterized by progressive multiple organ failure and high mortality rates. It can result from infection with either HSV-1 or HSV-2. We report a case of disseminated neonatal herpes that was caused by HSV-1 and HSV-2
A study of cyclic adenosine 3':5'-monophosphate and morphogenesis in Arthrobacter crystallopoietes (Arthrobacter globiformis) /
Strengthening the Safety Net: Bay Area Philanthropy's Response & Early Lessons
Analyzes grants to area organizations providing food, housing, or financial assistance and supportive services for low-income and disadvantaged groups. Points out gaps as well as best practices, including collaboration, partnerships, and system change
Determining best predictors of animal performance in feedlot steers
Two studies were performed in a feedlot environment to determine the long-term effects of heat events on animal performance and well-being. Experiments in this thesis were designed to pinpoint ambient variables that most strongly elicit animal thermoregulatory responses. These animal responses included core temperature (Tcore) alone in the first study, and both Tcore and animal respiration rate (RR) in the second. Both experiments went a step further by using both ambient conditions and animal responses to predict feed intake (FI) response to heat stress. The ability to predict FI based on measurable independent variables could be very helpful to beef producers who are otherwise subject to environmental stressors and loss in animal production. The first study followed 26 crossbred Angus steers during 42 days of a central Missouri summer in 2011 (July 12 through August 22), and was strictly aimed at predicting Tcore and FI using ambient information. Animals were housed at the University of Missouri Beef Research and Teaching Farm (BRTF) in Columbia, Missouri and had ad libitum access to feed and water, with [about]50% shade coverage over the pens. All variables were automatically measured and recorded throughout the entire study period. Linear and polynomial regression analyses of variance (ANOVA, JMP statistical software; SAS Institute; Cary, NC) were used. Both ambient and mean herd Tcore readings were averaged by hour to analyze the relationship between environment and Tcore during daytime (0700 to 1700 CST)
Improving Adult Outcomes for Former Foster Youth: California\u27s State-funded Transitional Housing Placement Plus (THP-Plus) Program
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