Fall 2014 Physics Colloquium
More information coming soon!
Thursday, September 25th
Dr. Hans Verlinde, Department of Meteorology, Pennsylvania State University
"I've Looked at Clouds From All Sides Now"
Contrary to intuition, clouds in the cold Arctic atmosphere frequently contain liquid water, even at temperatures as low as -30 °C! The presence of liquid water in these clouds is important because it changes how much the cloud warms the surface, and thus plays a role in the winter-time formation and summer melting of ice. In order to understand the role of these clouds in the rapidly changing Arctic, we understand their physical processes, and to do so need quantitative observations of their properties. But getting these observations is difficult: if you fly a plane into one of these clouds the plane can easily transform into a ball of ice. Therefore, we have to resort to remote sensing of the cloud properties, using a variety of sensors.
He will talk about the physics of mixed-phase clouds (liquid cloud that precipitates ice) and the challenges of observing their characteristics.
Wednesday, October 15th
Kenneth J. Davis, Professor of Meteorology, Pennsylvania State University
"The Breathing of the Earth and Fires of Industry: Measuring Greenhouse Gas Sources and Sinks at Regional Scales"
Human activity is increasing the greenhouse gas burden of the earth's atmosphere, resulting in an increasingly strong greenhouse effect. This strengthening greenhouse effect is changing the earth's climate and is highly likely to lead to increasingly severe climate changes if greenhouse gas emissions are not reduced. In response to this challenge, efforts to reduce greenhouse gas emissions, both voluntary and regulatory, are emerging. Measurements of emissions are needed to ensure that reduction targets are being met. Further, the earth's biosphere is an active source and sink of greenhouse gases, adding complexity to the problem of designing optimal climate management strategies.
He will review the role of greenhouse gases in the earth's climate system, the natural cycles of greenhouse gas sources and sinks, and the impact of human activity on the concentration of greenhouse gases in the earth's atmosphere. He will next review the current state of our ability to measure greenhouse gas sources and sinks using atmospheric methods. Methods include tower-based turbulent flux measurements, extrapolation of ecosystem fluxes across space using space-based remote sensing, and atmospheric budgets that utilize weather forecast systems combined with tower-, aircraft- and satellite-based greenhouse gas concentration measurements. Finally, he will present current applications of these methods to determine the net carbon dioxide fluxes of agricultural and forest landscapes, carbon dioxide and methane emissions from cities, and methane emissions from the shale gas fields of northern Pennsylvania.
Stafford Lecture Room
Thursday, October 23rd
Olivia Wilkins, Dickinson College
"Organic Chemistry in Young-Stellar Objects"
Astrochemistry is an emerging field that applies the lens of chemistry to the formation of stars, planets, atmospheres, and molecules. Among other projects, the Ӧberg Astrochemistry Group at the Harvard-Smithsonian Center for Astrophysics (CfA) investigates the formation of complex organic molecules and unsaturated carbon chains in protostellar environments. Understanding the chemical processes associated with such molecular species has the potential to provide insight into an even more complex prebiotic chemistry. In addition to discussing the work done with Karin Ӧberg at the CfA, this talk will provide an overview of radio astronomy and the journey by which I, a chemistry student, became involved in astronomy research.
Thursday, November 13th
Professor David Mertens - "Talk Title"
Tuesday, November 18th
Sigma Pi Sigma Talk - Sean Finnegan '01
Sigma Pi Sigma Dinner
Thursday, November 20th
Kim Moore, Ph.D. Candidate, Department of Physics, University of Maryland
"Using Physics as a Tool for Supporting and Enhancing our Understanding of the Life Sciences"
Over the last decade there have been increasingly urgent calls for the reform of the undergraduate science curriculum for life sciences majors and pre-medical students.1-4 In response to these concerns, the National Experiment in Undergraduate Science education (NEXUS) project was initiated to develop new science and math support courses. For the past five years, the University of Maryland's Physics Education Research Group and Biophysics Program have collaborated to design and implement an introductory physics course for life sciences (IPLS) students, employing student-centered pedagogy, a focus on epistemological development, and a revised course content emphasizing the physics relevant to living systems and the importance of interdisciplinary thinking. This calculus-based course, requiring a year of calculus, a year of biology, and a semester of chemistry as prerequisites, is aimed at using physics as a tool for supporting and enhancing students' understanding of biological phenomena, enabling a richer and more complex presentation of these phenomena in upper-level biology and chemistry courses.5
In 2012, a new laboratory curriculum was developed for and incorporated into this IPLS reform effort.6 These labs address physical issues at biological scales using microscopy, image and video analysis, electrophoresis, and spectroscopy in an open, non-protocol-driven environment centered on the question: "How can quantitative physical analyses help us understand biological phenomena?" This talk will focus on the design and implementation of these labs, their function within the larger NEXUS/Physics curriculum, and an analysis of the student response to this new approach.
[This work is supported by funding from the NSF and HHMI. Information about the NEXUS/Physics project can be found at www.nexusphysics.umd.edu.]
 National Research Council, Bio 2010: Transforming Undergraduate Education for Future Research Biologists (Nat’l Academy Press, 2003).
 National Research Council, A New Biology for the 21st Century (Nat’l Academy Press, 2009).
 AAMC/HHMI, Scientific Foundations for Future Physicians: Report of the AAMC-HHMI Committee (2009).
 AAAS, Vision and Change in Undergraduate Biology Education: A Call to Action (AAAS Press, 2011).
 E. F. Redish et al. “NEXUS/Physics: An interdisciplinary repurposing of physics for biologists,” Am. J. Phys. 82, 368–377 (2014).
 K. Moore et al. "Toward better physics labs for future biologists," Am. J. Phys. 82, 387-393 (2014).
Monday, December 8th
Senior Seminar Talks
Tuesday, December 9th
Senior Seminar Talks
Thursday, December 11th
Senior Seminar Talks