When fermions are in equilibrium with a heat bath they occupy states according to the well-known Fermi-Dirac distribution. When the bath is very cold, this distribution displays a discontinuous jump defining the location of the Fermi surface. But how should fermions occupy states when they are driven away from equilibrium by a time dependent periodic force? would their occupation still have sharp jumps? or would the periodic drive simply heat them up and smear their fermi surfaces?...
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Abstract：In this talk, we report some results of quaternion matrices for color image processing:denoising, phase retrieval, and factorization. Numerical examples are presented to show the effectiveness of the proposed quaternion approaches....
Social capital constrains opportunistic behavior and facilitates cooperation in bilateral relationships (Coleman 1988; Guiso 2010). We hypothesize that firms conducting business with high social capital customers are perceived by their banks as having lower supply chain risk and document a negative association between suppliers’ loan spreads and their major customers’social capital. Our cross-sectional analyses show that the negative association is stronger when: (1)suppliers make more significa...
Metasurfaces are ultra-thin metamaterials composed by planar meta-atoms arranged in specific macroscopic orders, which exhibit strong capabilities to control light [1-2]. In this Colloquium, I will present a brief overview on the historical development of this fast-developing research field, focusing particularly on our recent efforts in employing metasurfaces to control light in various aspects....
In this talk, we present a novel spectral re-normalization exponential integrator method for solving gradient flow problems. Our method is specifically designed to simultaneously satisfy discrete analogues of the energy dissipation laws and achieve high-order accuracy in time. To accomplish this, our method first incorporates the energy dissipation law into the target gradient flow equation by introducing a time-dependent spectral re-normalization (TDSR) factor....
The latest development of e-commerce transfers a part of the brands’ competition in the traditional market to a new channel, the livestreaming channel. In addition to the excitement generated by the very nature of livestreaming, consumers are attracted to the livestreaming channel because livestreamers often offer lowest-price guarantee....
