Automatic sets of rational numbers

The notion of a k-automatic set of integers is well-studied. We develop a new notion - the k-automatic set of rational numbers - and prove basic properties of these sets, including closure properties and decidability.Comment: Previous version appeared in Proc. LATA 2012 conferenc

How COVID-19 Changed Our Cities: Evidence from a National Survey

Human behavior is notoriously difficult to change, but a disruption of the magnitude of the COVID-19 pandemic has the potential to bring about long-term behavioral changes. During the pandemic, people were forced to experience new ways of interacting, working, learning, shopping, traveling, and eating meals. A critical question going forward is how these experiences have actually changed preferences and habits in ways that might persist. We collected a nationally-representative, 3-wave panel survey in the U.S. that aims to shed light on this question. This talk will draw from these data to describe how the pandemic did (and did not) change how we live in cities, what we still don\u27t know, and in which areas urban planners should adjust their assumptions as we look to the future.https://pdxscholar.library.pdx.edu/trec_seminar/1232/thumbnail.jp

Dancing Through Life: Dance as Physical Therapy to Prevent Falls

The basis of this project was to create a series of dance-based exercise activities to be used as part of an exercise class for elderly people who are classified as fall risks. The idea was to approach exercise through a medium that was convenient and versatile for the class leader, while being comfortable and fun for participants. The activities were developed and presented over the course of the six-week P.L.A.C.E. Program, held at the Montessori School of Bowling Green. Participants met four times to take part in a guided exercise class, and enjoy other activities. At these sessions, participants were led through a series of activities (some dance-based and some not.) Throughout the sessions, notes were made of what did and did not work for class, and what the participants did and did not engage in. On completion of the project, the activities were adjusted to align better with the participants and the class setting. The end result was a series of activities which could be used in a group exercise class for people who are fall risks, to engage participants and encourage their success with the activities

STUDENT PERCEPTIONS OF THE DEVELOPMENT OF MATHEMATICAL SELF-EFFICACY IN THE CONTEXT OF THE INSTRUCTIONAL SETTING AND PROBLEM SOLVING ACTIVITIES

This multi-case qualitative study, conducted in two elementary schools, observed the self-efficacy experiences of 67 5th grade mathematics students in daily lessons. Four classrooms were observed a total of 40 times for 30 minutes each. Two classrooms each used traditional instructional materials and standards-based instructional materials. Problem solving activity, interviews, a self-efficacy survey, and analysis of student work samples and teacher instruction materials were used to confirm information gathered through observation. Analysis of information sources resulted in the development of four major constructs: social learning, feedback, modeling, and strategy use. Both groups experienced each construct however, students in standards-based classrooms were exposed to higher levels of each. Recommendations for future research include the following: similar research with a more diverse socio-economic sample, research committed to detecting the background forces which promoted the site differences in social learning readiness, and inquiry into problem solving

Survey of Local Sustainability Practices in California

This report conveys the Round I results of the Strategic Growth Council (SGC) sponsored survey of local governments’ sustainability practices in California. The report is organized in two sections. Part I discusses the development and administration of the survey. Part II reports and examines the survey results. The SGC has an important interest in measuring local government activity to improve environmental sustainability. Captured in Spring 2012, these measurements establish a baseline snapshot of city- and county-level efforts to increase the resource efficiency of both local governments and the communities they serve. These baseline data provide a view of local government sustainability activity across various sectors and the factors that may encourage local governments to enhance their efforts further. When paired with future survey measurements, the data will allow the Council to identify trends in local sustainability efforts over time, as well as to assess the impact on local sustainability of the SGC sponsored Sustainable Communities Learning Network

Appendix H: The Lifecycle of Materials: An Appendix to the Report, “A Lifecycle Emissions Model (LEM): Lifecycle Emissions From Transportation Fuels, Motor Vehicles, Transportation Modes, Electricity Use, Heating and Cooking Fuels, and Materials”

This report is an appendix to the report titled "'A Lifecycle emissions model (LEM): lifecycle emissions from transportation fuels motor vehicles, transportation modes, electricity use, heating and cooking fuels, and materials". This report presents an analysis of the energy and emissions associated with the lifecycle of materials and automobiles. The materials composition of motor vehicles is discussed including descriptions of manufacturing processes, tabulations of energy and emissions data, and data sources. Energy use in and emissions from the assembly of motor vehicles is discussed as well as the transportation of raw materials, semi-fabricated products, and motor vehicles. The report also discusses energy used to make agricultural chemicals, with focus on materials used in automobiles