There are now a number of experimental platforms for fabricating self-folding origami structures. In these platforms, individual folds on an initially flat sheet are patterned so that the structure folds autonomously into a desired three dimensional shape.
The dream is to develop a system in which three-dimensional structures can be fabricated from a rapid roll-to-roll process. Yet, in our experiments with self-folding origami, structures sometimes misfold, especially as they become more complicated.
Simple rules can create complex patterns and dynamics. This connection is routinely used by living systems to create complex rhythms, spatio-temporal structures, and high-performance materials with surprising design features at meso- and macroscopic length scales that seem to defy their molecular origins.
In my lecture, I will present several examples that illustrate this point and demonstrate that many phenomena that appear to be unique to life processes actually occur in non-biological, often simple chemical systems.
The nonlinear dynamics of cardiac excitable waves is controlled by ion channels that are the basic molecular building blocks of the heart's electrical circuitry. Variations in gene expression and protein levels can cause the conductance of those channels to vary both between cells of the same heart and between hearts of different individuals in a genetically diverse population.
Most cancer deaths arise when then primary tumor metastasizes and cancer takes root in distant organs. From the point of view of cellular behavior, metastatic spread requires many capabilities (motility, chemoresistance, avoidance of cell death due to lack of adhesion, and ability to grow in a foreign location) which seem beyond what is normally possible for cells in typical organs.
First-year Grad students have expressed an interest in working in astrophysics. The Center for Relativistic Astrophysics(CRA) would like to invite you to “Meet the CRA" Friday, Sept 22 from 3pm-4pm, in the Howey Interaction Zone.
We will introduce the research and activities happening at the CRA and give students an opportunity to meet the Faculty and Staff and enjoy Pizza.
This talk will describe new routes to melting of crystal lattices. The lattices are nearly defect-free, and are formed through repulsive interactions exclusively, thus forming Wigner lattices. The absence of defects inhibits melting, making the crystal much more stable. This reduces the energy difference between crystal and liquid, giving the melting transition a distinct second order character, even though it is strictly a first order transition. This form of melting was first proposed by Born nearly 80 years ago, but it is only now that its study can be carried out.