Nov
04
Teaser:

Quantum Simulation with cold atoms is a very ambitious program in AMO research that is being pursued in many laboratories worldwide. The goal is to use cold atoms in optical lattices and in different environment to simulate important yet unsolved theoretical models. In this talk, I shall review the current progress of this effort, its success, and the serious challenges it faces. I shall discuss the possible solutions and the exciting future it holds.

Oct
30
Teaser:

Remoras (echeneid fish) reversibly attach and detach to marine hosts, almost instantaneously, to “hitchhike” and feed. The adhesion mechanisms that they use are remarkably insensitive to substrate topology and quite different from the latching and suction cup-based systems associated with other species at similar length scales.  Remora adhesion is also anisotropic; drag forces induced by the host’s swimming increase adhesive strength, while rapid detachment occurs when the remora reverses this shear load.  In this presentation, an investigation of the adhesive system’s...

Oct
28
Teaser:

Have you ever wondered why an egg solidifies at high temperature while most pure substances, like water, do not? Or why materials solely made of liquids can exhibit solid-like properties? Or why adding a tiny amount of certain additives to water dramatically changes the way water flows? This talk will touch on some of these aspects. It will start by discussing what soft condensed matter is and why soft materials are indeed soft. It will then briefly discuss viscous flow, to end introducing the significance of phase transformations in manipulating food. The aim of the...

Oct
23
Teaser:

I will discuss three fluid-mechanics problems: fluid motions related to drinking, clapping, and bouncing, which you might have experienced or observed once during daily activities.

...

Oct
21
Teaser:

With the availability of spectrally pure lasers and the ability to precisely measure optical frequencies, it appears the era of optical atomic clocks has begun.  At the expense of signal-to-noise ratio, in one project at NIST we have used single trapped atomic ions because uncertainties in systematic effects are smallest, reaching Df/f0 = 0.8 x 10-17.  At this level, many effects, including those due to special and general relativity, must be calibrated and corrected for.

Oct
16
Teaser:

Whole-cell patch clamp electrophysiology of neurons in vivo enables the recording of electrical events in cells with great precision, and supports a wide diversity of cellular morphological and molecular analysis experiments. However, high levels of skill are required in order to perform in vivo patching, and the process is time-consuming and painstaking. An automated in vivo patching robot would not only empower a great number of neuroscientists to perform such experiments, but would also open up fundamentally new kinds of experiment enabled by the resultant high throughput. We discovered that...

Oct
09
Teaser:

Circadian clocks rely on the alternation of light and dark to synchronize to the day/night cycle. However, a consequence of weather fluctuations and seasonal variations is that the driving signal received by the clock is highly variable not only from one day to the next but also throughout the year, which may compromise robust entrainment.

The microscopic green alga Ostreococcus tauri has recently emerged as a promising circadian model in the green lineage. Its clock is based on a central loop featuring orthologs of Arabidopsis TOC1 and CCA1 clock genes, yet seems to have a simpler architecture than Arabidopsis. The...

Oct
07
Teaser:

Flows of particulate material, such as sand discharging in an hourglass, are ubiquitous in nature and industry. The flow and transport of granules, powders, or grains is complex and can differ considerably from that associated with a single-phase material. This presentation will highlight some unique features of granular materials (such as the discharge from an orifice) and describe some recent work at Caltech on wave propagation, booming sand dunes, and granular flow rheology.   

Pages