Faculty Seminars are scheduled for the first Wednesday of every month and aim to bring together researchers and students from all walks of science to discuss recent and distinguished advances in science.

Seminars of the 2008-2009 academic year are as follows:

October 8, 2008 | Salim Çıracı | March 4, 2009 | Hakkı Turgay Kaptanoğlu | |

November 5, 2008 | Julius Jellinek | April 1, 2009 | Hüseyin Boyacı | |

December 3, 2008 | Levent Gürel | May 6, 2009 | Uygar Tazebay | |

December 17, 2008 | Cihan Saçlıoğlu |

__Speaker:__** Prof. Dr. Salim
**
**ÇIRACI**

Department of Physics, Bilkent University

Affiliation:

and

UNAM-Institute of Material Sciences and Nanotechnology

__Speaker:__**
Dr. Julius JELLINEK**

** Affiliation: **Chemical Sciences and Engineering Division, Argonne National Laboratory,

Argonne, Illinois 60439, USA

__ Abstract:__ I will present a
sketch of the history of metals and alloys and an overview of the current status
of the field of nanoalloys (alloy nanoparticles). These will be followed by a
discussion of our own results on structural, dynamical (thermal), and electronic
properties of Ni-Al bimetallic clusters.

__Speaker:__**Prof. Dr. Levent
G****ÜREL**

Department of Electrical and Electronics
Engineering,

Affiliation:

and

BILCEM, Computational Electromagnetics Research Center at Bilkent University.

Since 2006, the worlds largest integral-equation problems in computational electromagnetics have been solved at Bilkent University Computational Electromagnetics Research Center (BiLCEM). Most recently, breaking the latest world record actually required the solution of 205,000,000x205,000,000 dense matrix equations! This achievement is an outcome of a multidisciplinary study involving physical understanding of electromagnetics problems, novel parallelization strategies (computer science), constructing parallel clusters (computer architecture), advanced mathematical methods for integral equations, fast solvers, iterative methods, preconditioners, and linear algebra.

In this seminar, following a general introduction to our work in computational electromagnetics, I will continue to present fast and accurate solutions of large-scale electromagnetic modeling problems involving three-dimensional geometries with arbitrary shapes using the multilevel fast multipole algorithm (MLFMA). Accurate solutions of real-life problems require discretizations with tens or hundreds of millions of unknowns. To achieve the solution of such extremely large problems, maximizing the computational resources by parallelizing MLFMA on distributed memory architectures is needed. However, due to its complicated structure, parallelization of MLFMA is not trivial. Recently, we proposed a hierarchical parallelization strategy to increase the efficiency of parallelization. For more information, please visit www.cem.bilkent.edu.tr.

__
Speaker:__

Abstract:

__Speaker:__**
Assoc. Prof. Hakkı Turgay Kaptanoğlu**

__ Affiliation:__
Bilkent University, Department of Mathematics

Abstract:

__Speaker:__
Asst. Prof. Hüseyin BOYACI

** Affiliation:
**
Bilkent University,
Department of Psychology

Date:

Abstract:

In the rest of my talk I will discuss the results of some recent brain imaging studies conducted by our group. In those studies, using "visual illusions" (where the perceived magnitude of a stimulus is different than its actual physical magnitude, such as size or lightness) and functional magnetic resonance imaging (fMRI), we have found that the responses of early visual cortical areas, as early as in the primary visual cortex (V1), correlate with the perceived rather than physical magnitude of the visual stimuli. I will explain how and why these findings stand in contradiction to the classical models of the visual system, and argue that they will potentially contribute to important changes in the field of vision in the near future.

__Speaker:
__**Asst.
Prof. Uygar TAZEBAY**

__ Affiliation:__
Bilkent University, Department of Molecular Biology and Genetics

Date:

Abstract:

Contact person: Ali Sinan Sertöz