Events Calendar View

• Mathematical Physics Seminar Sep 18, 2013

  Asymptotic expansions and Fourier series

  

  Guest: Robert Varley, Dept. of Mathematics, UGA
  Wednesday, September 18, 2013 4:40 pm - 5:30 pm
  Location:

  iCal
• Departmental Colloquium Sep 19, 2013

  Ultrashort pulse propagation and ionization in dielectrics

  

  Guest: Prof. Jeremy Gulley, Department of Biology and Physics, Kennesaw State University
  Thursday, September 19, 2013 4:00 pm - 5:00 pm
  Location: Physics Auditorium (202)

  iCal

  The numerous applications of femtosecond lasers during the last 15 years has necessitated a detailed understanding of pulse propagation coupled with ultrafast laser-material interactions. Current ultrashort pulse propagation models describe the evolution of fields with broad spectra while models of laser-induced ionization and laser-plasma interactions typically assume monochromatic laser fields. In this seminar I address the inherent contradiction of combining multi- chromatic propagation models with monochromatic laser-material descriptions. Recently published experimental and simulation results are presented that show how this contradiction leads to order-of- magnitude errors in calculating the ionization yield. Further simulation results suggest that multi-chromatic effects will alter the shape and severity of laser-induced modifications to the bulk of dielectric solids.

• CSP Lunch Seminar Sep 24, 2013

  Modeling X-ray Emission with Accurate State-Selective Charge Exchange Cross Sections

  

  Guest: Renata Cumbee, UGA Center for Simulational Physics
  Tuesday, September 24, 2013 12:30 pm - 1:30 pm
  Location: CSP Conference Room (Room 322)

  iCal
• Mathematical Physics Seminar Sep 25, 2013

  Summation of Fourier series

  

  Guest: Robert Varley, Dept. of Mathematics, UGA
  Wednesday, September 25, 2013 4:40 pm - 5:30 pm
  Location:

  iCal
• Departmental Colloquium Sep 26, 2013

  Lightwave Neuromorphic Signal Processing

  

  Guest: Prof. Mable Fok, UGA College of Engineering, Electrical and Electronics Engineering
  Thursday, September 26, 2013 4:00 pm - 5:00 pm
  Location: Physics Auditorium (202)

  iCal

  In this talk, a new computational paradigm is presented using photonics to mimic the functionality of a spiking neuron. Spike processing is both computationally efficient and scalable, adopting the best features of both analog and digital computing. Whereas biological neurons implement spike processing using electrochemical spikes on a millisecond time scale, our “photonic neuron” performs spike processing using optoelectronic technology in picoseconds. Like it’s physiological counterpart, the photonic neuron consists of a reconfigurable FIR filter at it’s front end followed by integration and thresholding stages. A single photonic neuron circuit accomplishing feature recognition and imitating the escape response of a crayfish will be presented. One of the most powerful capabilities of neurons is their ability to learn and adapt to the environment based on experience. This is accomplished by adjusted the strength of synaptic connections based on correlations between pre-synaptic and post-synaptic activity. The first demonstration of learning using photonic technology will be presented, potentially laying the foundation for learning at speeds a billion times faster than biological neurons.

• CSP Lunch Seminar Oct 1, 2013

  Sticking of atomic hydrogen on amorphous water ice

  

  Guest: Vijay Veeraghattam, UGA Physics and Astronomy
  Tuesday, October 1, 2013 12:30 pm - 1:30 pm
  Location: CSP Conference Room (Room 322)

  iCal

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