Events Archive

Aug
17
2012
Magnetic nanostructures for on-chip manipulation of biological entities and biosensing
In this paper we present recent results obtained in the Nanobiotechnology and Spintronics group of  the LNEES research center of Politecnico di Milano, partially in cooperation with the nanoGUNE center in Spain, in the field of lab-on-chip devices based on magnetic nanostructures. Manipulation of biological entities:
Jul
19
2012
Computer simulations of frustration in soft matter systems; from nematic shells to bolaamphiphiles
I will discuss some recent computer simulations of three different systems; nematic shells, sticky colloidal particles on surfaces and the bulk phases of liquid crystalline bolaamphiphiles. For nematic shells, a layer of liquid crystal is used to coat a microscopic particle. In this geometry, defects necessarily occur – the system is frustrated so that the director profile and local orientational ordering is not constant everywhere. We examine the interactions between the defects for a number of different types and shapes of particles and other cavities. I will also discuss sticky colloids on a...
Jul
09
2012
Defibrillation mechanisms on a one-dimensional ring of cardiac tissue
EVO link:  http://evo.caltech.edu/evoNext/koala.jnlp?meeting=MtM8Ma2t2DD8Du9s92Ds9t Defibrillation is a medical treatment used to terminate ventricular fibrillation or pulseless ventricular tachycardia. An electrical device via a pair of...
Jul
05
2012
The Shadow of a Single Atom
Jun
13
2012
Live-stream of NASA NuStar Launch
       
May
25
2012
Soft Materials Workshop
The workshop brings together researchers with an interest in soft materials, fluids, and biophysics to discuss their work and explore partnerships.  All participants may present a sound bite (a few minutes talk).  Registration is free, but is required.  Fill our an on-line form and send sound bite slides to alison.morain@physics.gatech.edu.
May
01
2012
Non-conservative Optical Forces on Nanoparticles
We will address some basic questions related to the light forces on small (Rayleigh) particles, which are usually described as the sum of two terms: the dipolar or gradient force and the scattering or radiation pressure force. The scattering force is traditionally considered proportional to the Poynting vector, which gives the direction and magnitude of the momentum flow. However, as we will show, when the light field has a non- uniform spatial distribution of spin angular momentum there is an additional  non-conservative force term is proportional to the curl of the spin angular momentum of...
Apr
24
2012
Dynamics by the Dozen
Nonlinear dynamics has the feature that it is conceptually and mathematically challenging and yet ubiquitous in its applications. Indeed, one of the appeals of the subject is the universality of some of its frameworks and results. We are attempting to take advantage of such wide applicability in order to involve an unusual range of participants in nonlinear dynamics research. This range spans from postdoctoral to K-12 students as well as teachers.
Apr
23
2012
Cavity Optomechanics
Cavity optomechanics is rapidly developing into a major area of research.  This is a result of the developments from two converging perspectives on the physical world. From the top down perspective, ultra-sensitive micromechanical and nanomechanical detectors have become available utilizing the advanced materials and processing techniques of the semiconductor...
Apr
20
2012
Reduced Order Modeling and Gravitational Waves
I will give an overview of a program to map the space of configurations of binary compact coalescences, starting for preliminary indications a couple of years ago that the problem is amenable to reduced order modeling. I will then give an overview of Reduced Basis, our results obtained so far and a roadmap for the future.  Essentially, the core issue is how to chose the most relevant points in parameter space, in a nearly optimal way, and to select which configurations are "the most representative ones". This applies to the case in which the emitted gravitational waves can be simply evaluated using closed form approximations or obtained by solving simple equations but,...

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