Weld joint strength and mechanical properties in 2219-T81 aluminum alloy

Plate and sheet were welded using automatic TIG /Tungsten Inert Gas/ weld techniques and manual repair weld techniques. Yield strength of 2219-T81 sheet and plate decreases significantly when welded

Course Design in an Integrated First-Year Honors Sequence: Service Learning, Scaffolded Research, & Faculty Collaboration

Presentation given at Pre-ISSOTL Council on Undergraduate Research Symposium. In this presentation, participants will learn about a collaboration of two professors working with a cohort of 15 students in a year-long integrated sequence first-year Honors course. Both semesters of the course center around the theme of animals in the lives of children, families, and communities. In the first semester, the course focuses more narrowly on animal-assisted therapies. In the second semester, the course focuses more broadly on global and diversity issues. As part of this course, students must complete both 25 hours of service learning and a research project. Students complete the project in multiple scaffolded steps, first at an individual level (fall semester) by identifying a topic related to the course, finding five relevant research articles, and presenting one article to the class. At the end of the fall semester, students create poster presentations which incorporate all five articles. In the spring semester, students are placed into small groups around common topic themes and integrate their research findings and work toward a final product presenting multiple research studies in a meta-analysis style tabular format to the class. The primary objective of the session is to demonstrate a method to involve students in research through the curriculum, leading to analysis and integration of research findings. Participants will be involved by seeing examples of each step and by discussing the authors\u27 experiences in using this approach. Participants will learn about the benefits of: a) collaboration with another faculty member, b) working with the same cohort of students over two semesters, and c) the student outcomes when first-year are involved in scaffolded steps in understanding research

A General Equilibrium Theory of Contracts in Community Supported Agriculture

Community Supported Agriculture (CSA) contracts allow consumers to buy claims on a farm\u27s future production. In turn, the consumer provides working capital to the farm during the growing season. CSA contracts also provide risk management for farmers with limited access to Federal crop insurance by transferring part of the farm\u27s risk to the consumer. We derive a theory of CSA contract pricing for the two most prevalent types of CSA contracts: yield contracts, in which consumers receive a percentage of the farm\u27s production, and weight contracts, in which consumers receive fixed quantities. We develop a two-period model in which expected utility maximizing producers and consumers engage in CSA contracting in the first period based on anticipation of yields and spot prices in the second period. Using the model, we generate several testable hypotheses to be explored in future research. Additionally, we present an overview of the data necessary to test the propositions and potential challenges that might arise in related empirical work

Trend assessment: applications for hydrology and climate research

The assessment of trends in climatology and hydrology still is a matter of debate. Capturing typical properties of time series, like trends, is highly relevant for the discussion of potential impacts of global warming or flood occurrences. It provides indicators for the separation of anthropogenic signals and natural forcing factors by distinguishing between deterministic trends and stochastic variability. In this contribution river run-off data from gauges in Southern Germany are analysed regarding their trend behaviour by combining a deterministic trend component and a stochastic model part in a semi-parametric approach. In this way the trade-off between trend and autocorrelation structure can be considered explicitly. A test for a significant trend is introduced via three steps: First, a stochastic fractional ARIMA model, which is able to reproduce short-term as well as long-term correlations, is fitted to the empirical data. In a second step, wavelet analysis is used to separate the variability of small and large time-scales assuming that the trend component is part of the latter. Finally, a comparison of the overall variability to that restricted to small scales results in a test for a trend. The extraction of the large-scale behaviour by wavelet analysis provides a clue concerning the shape of the trend

Weldment flaw growth characteristics of 2219-T81 aluminum alloy Final report

Nondestructive tests, fracture mechanics, and welding techniques for aluminum alloy

Migratory birds use head scans to detect the direction of the earth’s magnetic field

Night-migratory songbirds are known to use a magnetic compass [1–3], but how do they detect the reference direction provided by the geomagnetic field, and where is the sensory organ located? The most prominent characteristic of geomagnetic sensory input, whether based on visual patterns [4–7] or magnetite-mediated forces [8, 9], is the predicted symmetry around the north-south or east-west magnetic axis. Here, we show that caged migratory garden warblers perform head-scanning behavior well suited to detect this magnetic symmetry plane. In the natural geomagnetic field, birds move toward their migratory direction after head scanning. In a zero-magnetic field [10], where no symmetry plane exists, the birds almost triple their head-scanning frequency, and the movement direction after a head scan becomes random. Thus, the magnetic sensory organ is located in the bird's head, and head scans are used to locate the reference direction provided by the geomagnetic field

Blogging about Service-Learning Experiences

Presentation given at the SoTL Commons: A Conference for the Scholarship of Teaching and Learning. This project examines a year-long Honors First Year Experience course in Animal-Assisted Therapy, a course introducing students to the effects of therapy animals on various populations with various conditions in multiple settings. From Fall 2012 to Spring 2013, students were required to participate in service-learning activities with either the local chapter of Therapy Dogs International or the local therapeutic horseback riding program and to blog about their experiences. For their blogs, students had to describe their experiences, their reactions to the experiences, how the experiences related to the course, and any questions or concerns that arose. Qualitative analyses of students’ blogs were conducted, using a Grounded Theory approach. Results revealed that students could identify the key role therapy animals can play in enhancing rehabilitation and development. Additionally, service-learning augmented the students’ knowledge of, awareness of, and interest in animal-assisted therapy and showed how animals themselves appear to act as crucial learning instruments in certain settings. Session objectives include introducing attendees to service-learning and exploring the lurking implication that animals can enhance learning environments. Attendees will learn how service-learning has the potential to add to all disciplines and will be challenged to think of ways to implement animals into student learning