Jan
15
Teaser:

Our method of nanoscale magnetic sensing and imaging makes use of nitrogen-vacancy (NV) color centers a few nanometers below the surface of a diamond crystal. Using individual NV centers, we perform NMR experiments on single protein molecules, labeled with ^{13}C and ^2H isotopes. In order to achieve single nuclear-spin sensitivity, we...

Dec
11
Teaser:

Galaxy clusters are the most massive virialized objects in the universe, and have the potential to be highly accurate probes of cosmological parameters. A fundamental challenge for cluster cosmology is to estimate the masses of these objects using observational proxies such as X-ray luminosity and temperature, which are complicated by the merger history of clusters and the microphysical properties of the intracluster medium. These effects, while frustrating to cosmologists, provide a rich laboratory for exploring the plasma physical processes that are occurring in these massive objects. In this talk I will...

Dec
05
Teaser:

Take a break from studying and come listen to Prof. Yoshida describe the history of the universe over 13 billion years since the Big Bang. He will use the visual results from recent state-of-the-art computer simulations that aid our understanding on how astronomical objects such as stars, galaxies, and black holes form in an expanding universe. He will explore prospects for future high-performance computing using exascale computers.

Dec
03
Teaser:

Human and animal societies are exemplars of complex adaptive systems. Through multiple interactions between society members, they dynamically organize themselves and integrate information over multiple scales, both above (environmental) and below (genetic, physiological) the individual level. In the past 25 years, researchers across a range of fields including statistical physics, network theory and behavioral ecology have made enormous progress in understanding the positive and negative consequences of these multi-scale, self-organizing coordination mechanisms. I will present key concepts in...

Dec
01
Teaser:

The syntax of theoretical physics and modern finance is deceptively similar, but the semantics is very different. I present a short introduction to the principles of modern finance, and compare and contrast the field to physics.

Nov
25
Teaser:

The Ebola epidemic in West Africa has spurred an international response. This response has been strongly influenced by epidemiological models that predicted a devastating rise in cases without large-scale changes in behavior and intervention. In this talk, I introduce the mathematical principles underlying predictions of the rate and scope of a disease epidemic. I then explain how such principles have been applied to forecasting Ebola virus disease (EVD) dynamics and identifying the type and scale of necessary control. One control mechanism involves influencing behavior and social norms to limit post-death transmission, e.g., during burial ceremonies of...

Nov
24
Teaser:

The cell can be thought of as an organized collection of molecular machines. As such, many biomolecules can have moving parts, generate, bear and leverage forces, and convert chemical energy to mechanical work and vice versa. In this talk I will use several examples to illustrate how mechanics can regulate biology at the molecular scale.

 

Nov
19
Teaser:

Gelation and vitrification are the most common mechanisms for a liquid-to-solid transition in amorphous materials. For both, a heterogeneous, percolating internal structure grows and reduces the mobility of internal constituents. Macroscopic rheological properties are strongly affected but appear to be very similar for gelation and vitrification. Here we propose a novel rheological test to distinguish between gelation and vitrification. The test is based on Boltzmann’s equation of linear viscoelasticity and focuses on the distribution of relaxation modes in samples near the liquid-to-...

Nov
18
Teaser:

Great voyages of exploration have always been driven in large part by an insatiable curiosity to know what is beyond the furthest horizon you can see. Five hundred years ago, the European exploration of the globe was a central feature of the expanding scientific and artistic explosion we call the Renaissance and Enlightenment. Today, we are once again witnessing an age of exploration and discovery, as we push beyond the shores of Earth, looking deep into the far reaches of space. You and I live in an age where, for the first time in...

Nov
18
Teaser:

Entangled polymers have been thoroughly studied since the 1940s at least....or so we thought. In the last decade particle velocimetry and other imaging methods, combined with rheology, have shown that some dramatic instabilities can occur in strongly sheared well-entangled polymer melts. I will discuss how some of these new observations (such as various shear banding phenomena and `fracture') can be understood in terms of the 'Standard Model' for entangled polymers, and highlight some of the current controversies in the area.

Nov
12
Teaser:

In this talk we will bring parallels of science and cooking to the fore.  Using a wide variety of kitchen cooking techniques whose inner workings on the molecular level can be explained through chemistry and physics we hope to make the science and the food more easily understandable.  We will cover topics ranging from surface tension, diffusion processes, gelation, crystallization and viscoelasticity. The overall...

Nov
11
Teaser:

For many viruses, the spontaneous assembly of a capsid shell around the nucleic acid (NA) genome is an essential step in the viral life cycle. Understanding how this process depends on the charge, structure, and sequence of the nucleic acid could promote biomedical efforts to block viral propagation and guide the reengi-neering of capsids for gene therapy applications.

This talk will describe coarse-grained models of capsid proteins and NAs which enable dynamical simulations of...

Nov
10
Teaser:

The 21st Century has seen an explosion of bio-inspired technology and devices. Perhaps no where has this approach been more transformative than in the field of mobile robotics. Geckos, snakes, and even cockroaches have motivated new sticky, stable, steerable robots. Yet inspiration means more than curiosity. As scientists we must unravel the scientific principles and mechanisms underlying animal performance. By studying the physics of these living systems we can inform a systematic approach to animal-inspired robotics. By doing so, we discover new properties and dynamics of complex systems -- the robots themselves even...

Nov
10
Teaser:

The history of drift-tube measurements of gaseous ion transport coefficients is reviewed, with an emphases on the contributions made by Dr. Gatland.  The use of experimental measurements of such coefficients in testing ion-neutral interaction potentials over wide ranges of internuclear separation is illustrated through recent tests of ab initio potentials.  Finally, the use of such data with recent theoretical advances is shown to have implications for ion-neutral reactions of importance in the ionosphere.

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