Comet Calendar, The Official Event Calendar for UT Dallas en-us This week's events for Natural Sciences & Mathematics at UT Dallas Physics Colloquium: Superconductivity: from Basic Science to Novel Technology Wednesday, Feb 21
(4 p.m. - 5 p.m.)

Dr. Timothy Haugan (Air Force Research Laboratory - Aerospace Systems Directorate)

The field of superconductivity encompasses a broad range of technical disciplines, from the fundamental sciences that discover new materials and phenomena, to the engineering fields that develop useful applications.  Superconductivity was serendipitously discovered in solid mercury at 4.2 K in 1911 by Kamerlingh Onnes, who was awarded the Nobel Prize almost immediately in 1913.  Since then many new classes of superconducting materials continue to be discovered over time primarily by empirical methods, and the record superconducting transition temperature has reached 133 K (-140°C) in Cu-oxide superconductors for ambient conditions, and 209 K (-64°C) for H3S at ~ 1 Million atmosphere pressure.  For almost every new class of materials discovered, new mechanisms of superconductivity are revealed, and challenges begin to develop these materials for applications.  Applications cover a range of micro-electronics, high power, and photonic devices; which exploit the many unique properties of superconductivity including the incredible phenomena of ultra-high-density current flow with zero-resistance and zero-loss of energy.  To realize applications; however, difficult materials and engineering challenges continually have to be addressed and overcome.  
      This talk will introduce some of the basic physics and mysteries of superconductivity, and present also on how technology development proceeds from materials discovery to new applications based on physics-based phenomena.  Development of superconductivity applications follows the time-line of many technologies, requiring typically 20 and 30 years from basic discovery to product commercialization and impact to society.   And new cycles of discovery are always needed, to continually develop new technologies and capabilities.    


Spring 2018 Biological Sciences Seminar Series- Dr. Joanna Sulkowska, University of Warsaw Thursday, Feb 22
(3 p.m. - 4 p.m.) Location: RL 3.204.

“Mysteries of entanglement: proteins, life and physics-the biological role of knotting”

Abstract: Knotted proteins are believed to be functionally advantageous and to provide extra stability to protein chains. Twenty years of investigation suggests that they fold via a slipknot conformation, across the native twisted loop. This lecture presents how the diversity of identified folds of knotted proteins and their locations in cells is still growing and surprising us. Moreover it has been found that proteins can be even more entangled than knots– they also form lassos and links, which consist of several components. Based on the search through the entire Protein Data Bank, identified are several sequentially nonhomologous chains that form a Hopf link, a Solomon link, and various types of lassos. This lecture will show that topological properties of these proteins are related to their function and stability, and how the presence of links affects folding pathways of proteins and present new reaction coordinate to study entangled proteins. Knotted TrmD is the leading antimicrobial drug target owing to its essen­tiality for bacterial growth, its broad conservation across bacterial species, and its substantial differences from the human and archaeal counterpart Trm5. Dr. Sulkowska will present her achievements in designing selective inhibitor for TrmD, based on combining theoretical and experimental methods. All entangled proteins– 7% of proteins deposited in the PDB– are collected in databases: KnotProt, LassoProt and LinkProt. 

Mathematical Sciences Colloquium by Emily Grosholz Friday, Feb 23
(11 a.m. - 12 p.m.)

Emily Grosholz

English and Philosophy

Penn State University

The Growth of Mathematical Knowledge

My focus in the philosophy of mathematics has always been on the ways in which mathematical knowledge grows. Working through detailed case studies in my past three books (1991, 2007 and 2016), I have proposed an account of the growth of mathematical knowledge in terms of intersecting domains, patterns of ampliative reasoning, shifts in notation, and the combination of reference and (Leibnizian) analysis. I will explain these strategies using examples from my most recent book.


Coffee to be served in the classroom 30 minutes prior to the talk.