We propose a type of ultra-thin metasurfaces composed of rectangular graphene patches supporting orthogonal plasmonic resonances, which can work in transmission or reflection modes for dynamic terahertz wavefront manipulation with high polarization conversion ratio. By controlling the response of each patch via electrical biasing, the phase of the output wave can be tuned in a wide range over 180° while keeping its amplitude high and relatively stable. We demonstrate several functional devices based on such metasurfaces: a linear polarization converter with nearly 100% polarization conversion ratio, a switchable anomalous wave deflection device, and a dual-polarity focusing mirror with the focal spot tunable in both the transversal and longitudinal directions.

Mechanoreceptor cells develop a specialized cytoskeleton that plays structural and sensory roles at the site of mechanotransduction. However, little is known about how the cytoskeleton is organized and formed. Using electron tomography and live-cell imaging, we resolve the 3D structure and dynamics of the microtubule-based cytoskeleton in fly campaniform mechanosensory cilia. Investigating the formation of the cytoskeleton, we find that katanin p60-like 1 (kat-60L1), a neuronal type of microtubule-severing enzyme, serves two functions. First, it amplifies the mass of microtubules to form the dense microtubule arrays inside the sensory cilia. Second, it generates short microtubules that are required to build the nanoscopic cytoskeleton at the mechanotransduction site. Additional analyses further reveal the functional roles of Patronin and other potential factors in the local regulatory network. In all, our results characterize the specialized cytoskeleton in fly external mechanosensory cilia at near-molecular resolution and provide mechanistic insights into how it is formed.

Based on the perspective of resource conservation theory, this paper adopts the questionnaire survey method and takes 345 enterprise employees as samples to discuss the impact of humble leadership on employee creativity and how the perceived organizational support has a moderating effect on the relationship between humble leadership and employee creativity. The results show that humble leadership has a positive influence on employee creativity, and this relationship is mediated by knowledge hiding. Perceived organizational support positively moderates the relationship between humble leadership and employee creativity.

Graphene and activated carbon were tested as absorbents for the adsorption of cobalt(III) complexes. The SEM and TEM images showed that graphene disperses more evenly and had more uniform spacing of layers than activated carbon. However, the FTIR analysis showed that activated carbon had more characteristic functional groups than graphene. These property differences led to different cobalt(III) adsorption efficiencies. Graphene showed higher adsorption efficiency than activated carbon under identical experimental conditions. For both adsorbents, the adsorption efficiency increased with the increasing mechanical mixing intensity, solution temperature, and absorbent concentration, and decreased with solution pH. Under the conditions tested herein, the adsorption efficiency using graphene could reach more than 95 %.