Innovation Design Study on E- Bidding System: Chinese Enterprise Group experience

The e-bidding platform of electric enterprise group purchase business is regard as a complex system of interrelated economic, organizational, social and elements as well as the external and internal information flows of a company. Getting positive synergistic effect is one of the important factors for the enterprise group procurement business innovation. The paper showcase the synergistic effect framework, and then study synergistic effect of the e-bidding platform based on complex adaptive theory .We sharp enterprise group purchase system, research how to get positive synergistic effect contributions to the enhancement of the efficiency of the business overall

Study on E- Business Platform of Electric Enterprise Group Based on the Perspective of System Synergy

the paper showcase the synergistic effect framework and apply it to a study on electricity energy groups of internet bidding platform on B2B supply business. We enumerate electricity grid enterprise group’s purchase system. Since 2006, by setting up the multi-layer purchase system based on internet. Chinese energy enterprise group began to adopt internet supply platform and take full advantage of synergistic effect and scale effects, decrease the trade cost of whole supply chain. From the perspective of system synergy, the paper firstly analyzed the model building on e-procurement platform, and then offered a set of evaluation index on synergistic effect, lastly through empirical analysis, point out there is not only positive synergistic effect but also negative synergistic effect on the e-business platform of the purchase system

Directional photodetectors based on plasmonic metasurfaces for advanced imaging capabilities

With the continuous advancement of imaging technologies, imaging devices are no longer limited to the exclusive measurement of optical intensity (at the expense of all other degrees of freedom of the incident light) in a standard single-aperture configuration. Increasingly demanding applications are currently driving the exploration of more complex imaging capabilities, such as phase contrast imaging, wave front sensing, optical spatial filtering, and compound-eye vision. Many of these applications also require highly integrated, lightweight, and compact designs without sacrificing performance. Thanks to recent developments in micro- and nanophotonics, planar devices such as metasurfaces have emerged as a powerful new paradigm to construct optical elements with extreme miniaturization and high design flexibility. Sophisticated simulation tools and high-resolution fabrication techniques have also become available to enable the implementation of these compact subwavelength structures in academic and industrial labs. In this dissertation, I will present my work aimed at achieving directional light sensing by directly integrating composite plasmonic metasurfaces on the illumination windows of standard planar photodetectors. The devices developed in this work feature sharp detection peaks in their angular response with three different types of behaviors: symmetric around the device surface normal, asymmetric with nearly linear angular variations around normal incidence, and geometrically tunable single peaks up to over 60 degrees. The performance of the proposed metasurfaces has been optimized by full-wave numerical simulations, and experimental devices have been fabricated and tested with a custom-designed measurement setup. The measured angular characteristics were then used to computationally demonstrate incoherent edge enhancement for computer vision and quantitative phase-contrast imaging for biomedical microscopy. Importantly, the device fabrication process has also been upgraded to wafer scale, further promoting the possibility of batch-production of our devices

Spontaneously-Induced Dirac Boundary State and Digitization in a Nonlinear Resonator Chain

The low-energy excitations in many condensed matter and metamaterial systems can be well described by the Dirac equation. The mass term associated with these collective excitations, also known as the Dirac mass, can take any value and is directly responsible for determining whether the resultant band structure exhibits a band gap or a Dirac point with linear dispersion. Manipulation of this Dirac mass has inspired new methods of band structure engineering and electron confinement. Notably, it has been shown that a massless state necessarily localizes at any domain wall that divides regions with Dirac masses of different signs. These localized states are known as Jackiw-Rebbi-type (JR-type) Dirac boundary modes and their tunability and localization features have valuable technological potential. In this study, we experimentally demonstrate that nonlinearity within a 1D Dirac material can result in the spontaneous appearance of a domain boundary for the Dirac mass. Our experiments are performed in a dimerized magneto-mechanical metamaterial that allows complete control of both the magnitude and sign of the local material nonlinearity, as well as the sign of the Dirac mass. We find that the massless bound state that emerges at the spontaneously appearing domain boundary acts similarly to a dopant site within an insulator, causing the material to exhibit a dramatic binary switch in its conductivity when driven above an excitation threshold