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Upcoming Seminars

When: Thursday 1/24 at 2:00 PM

Where: 105 College Hall

Speaker: Dr. Marta Lewicka University of Pittsburgh

Title: How to understand the shape of growing leaves and flowers through
Mathematical Analysis and Geometry.

Abstract: In certain circumstances, growing elastic tissues such as leaves, flowers or some small marine invertebrate organism, are 'stressed' and develop the curious wavy-like patterns, resembling curves and ruffles at the edge of a thorn plastic sheet. These phenomena have recently received a lot of attention in the communities of Mathematicians, Material Scientists and Biologists, as displayed by dozens of related articles in journals like 'Science', 'Nature' or 'Scientific American'.

It turns out that 'morphogenesis by growth' can be rigorously studied through a mathematical model, in which the distances between points (e.g. cells) are measured in a non-standard way, pertaining to the so-called 'non-Euclidean version of nonlinear elasticity'. In this elementary talk, I will explain the meaning of the above terminology in detail.

All are welcome. Snacks will be provided.

Past Seminars

When: Thursday 1/17 at 2:00PM

Where: 446 College Hall

Speaker: Dr. Brad Lucier, Purdue University

Title: Wavelet Image Compression for Beginners

Abstract: Twenty years ago wavelet image compression was an active research area in both mathematics and signal processing. Today, any camera or smart phone in your pocket implements a wavelet compression algorithm in the
form of the JPEG 2000 image compression standard.

In this talk I'll introduce digital images and explore the simplest possible version of wavelet image compression. We'll see how the compression algorithm can be tailored to match certain properties of the human visual system. I may mention how the performance of a wavelet compression algorithm depends on the smoothness of an image, defined in a precise mathematical sense, or how wavelet compression algorithms applied to, e.g., mammograms, can be tailored to preserve certain features that are of importance in medical diagnoses.

All are welcome. Snacks will be provided.

All the past semesters seminars for the Fall 2012 semester are listed on the Fall 2012 Seminar List Page