Events Calendar View

• Departmental Colloquium Feb 14, 2013

  Chemical Evolution and Gamma-Ray Astronomy

  

  Guest: Dieter Hartmann, Clemson, Department of Physics and Astronomy
  Thursday, February 14, 2013 4:00 pm - 5:00 pm
  Location: Physics Auditorium (202)

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  One of the grand themes of modern astrophysics is the progressive chemical enrichment of the Universe. Since the hot beginnings with little more than hydrogen and helium, the 4% mass fraction of the mostly metal free baryon component has been enriched to about 2%, by mass, in elements beyond H and He. The underlying cycle of star formation, stellar evolution, static/dynamic (explosive) nucleosynthesis and feedback of freshly processed material to the interstellar medium is also critical for our understanding of galactic evolution, and thus our general understanding of the building blocks of the Universe. This colloquium will discuss how gamma-ray astronomy is used to trace some of the relevant quantities involved in local chemical evolution, through “Astronomy with Radioactivities”, and how observations in the gamma-ray regime shed light on chemical evolution on cosmic scales. 

• NanoSEC Seminar Feb 15, 2013

  Write a good research paper

  

  Guest: Prof. Zhengwei Pan
  Friday, February 15, 2013 4:00 pm - 5:00 pm
  Location: Riverbend Research South Laboratory Auditorium

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• Departmental Colloquium Feb 21, 2013

  Nitric Oxide and its Van der Waals Complexes: A Fresh Look at a Tiny Molecule and its Impact

  

  Guest: Henning Meyer, UGA Physics and Astronomy
  Thursday, February 21, 2013 4:00 pm - 5:00 pm
  Location: Physics Auditorium (202)

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  Nitric oxide is a persistent radical which results from the direct combination of nitrogen and oxygen. While it has a long standing history, it is still of considerable chemical and biological importance. More recently, research efforts have been reinvigorated by efforts to control NO emissions from internal combustion engines (especially with the advent of alternative fuels) and to understand its functional role in biology. NO has indeed been identified as a key physiological regulator involved in a variety of biological processes. An important factor in the chemistry of NO and NO2 is the strength and prevalence of van der Waals complex formation, especially their self and cross dimers.

• NanoSEC Seminar Feb 22, 2013

  Entrepreneurship for a researcher

  

  Guest: Dr. Christopher Hanks
  Friday, February 22, 2013 4:00 pm - 5:00 pm
  Location: Riverbend Research South Laboratory Auditorium

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• Departmental Colloquium Feb 28, 2013

  Density and Diffusion Anomalies in Lattice Model for Water

  

  Guest: Prof. Marcia Barbosa, Instituto de Física, Universidade Federal do Rio Grande do Sul
  Thursday, February 28, 2013 4:00 pm - 5:00 pm
  Location: Physics Auditorium (202)

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  Water is one of the most abundant substance on the planet, however its thermodynamic and dynamic properties are away from being fully understood. Unlike other liquids, its specific volume at ambient pressure increases when cooled below T = 4oC. Besides, the isothermal compressibility, κT and the specific heat at constant pressure, CP , have a minimum at T = Tmin. For temperatures below Tmin, κT and CP increase with temperature decrease and above Tmin, κT and CP increase with temperature increase.

  In the last years the interest the supercooled region of the pressure temperature phase diagram has increased. In this region water is forced to be in liquid state due to fast freezing of the system. Different from normal liquids, the self diffusion, D, of the supercooled water increases with the compression up to maximum value Dmax(T) at p = pDmax. Beyond this maximum value, for higher pressures, the ”normal” behaviors is restored, and diffusion decreases with pressure. This results are supported by numerical simulation using the SPC/E water model where the supercooled region is easily accessed.

  In this talk we present a lattice model in which the directionality present in the hydrogen bonds of water is introduced. This model is capable to reproduce qualitatively the density and diffusion anomalies observed in liquid water. In addition it provides a new scenario for the liquid-liquid phase transition proposed for liquid water. 

• NanoSEC Seminar Mar 7, 2013

  Patents and copyrights for a researcher

  

  Guest: Dr. Gennaro J. Gama
  Thursday, March 7, 2013 4:00 pm - 5:00 pm
  Location: Riverbend Research South Laboratory Auditorium

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