Abstract While structural coloration has captured considerable interests across different areas in the past decades, the development of macroscopic objects with tailorable structural colors remains a challenge due to the difficulty of large‐scale fabrication of finely ordered nanostructures and poor processability of their constituent materials. In this work, a type of photonic granular hydrogel is developed as a novel printable ink for constructing customized structural colored objects. The magnetochromatic ink exhibits dynamic properties such as shear thinning and self‐healing, enabling direct writing of macroscopic structural colored patterns by extrusion 3D printing. Further, the modularity of the photonic ink allows additive color mixing, which obviates the need for arduous nano‐synthesis and expands on the color abundance of structural colored materials in a simple yet efficient manner. These characteristics grant novel photonic inks with great applicability to a variety of fields including switchable color displays, sensors, etc.
The comprehensive promotion of the "Belt and Road" initiative and the "dual-carbon" strategy provides opportunities for the economic development of the Southwest border, but also puts forward high-quality development requirements. The rapid development of urbanization in the Southwest border region has caused a surge in the demand for building energy, as well as the dynamic characteristics of "season-geography". Therefore, it is of great significance to carry out collaborative planning and allocation methods of fixed resources and flexible resources to promote the efficient collaborative operation of the integrated energy system. This paper presents an integrated collaborative planning optimization method for fixed resource and flexible resource planning-operation of an integrated energy system taking into account the dynamic characteristics of multiple loads in the southwest border region. Aiming at the comprehensive optimization of economy, environmental protection, reliability and flexibility, and considering the characteristics of equipment and the dynamic characteristics of multiple loads of buildings, a planning optimization method combining fast non-dominated sorting genetic algorithm III with elite strategy and dynamic data envelopment analysis and Rank and ratio synthesis ranking method is adopted to realize the rational planning and allocation scheme of fixed resources and flexible resources in an integrated energy system. The results show that the proposed planning and operation integrated cooperative planning and allocation method can effectively improve the comprehensive performance of the integrated energy system, and has important practical significance for the cooperative planning and allocation of fixed and flexible resources in the southwest border area.
Abstract Heating and cooling storage air conditioning is an important part of the integrated energy system, which can play an important role in the flexible conversion of thermoelectric coupling systems. Because storage air conditioning involves the dynamic characteristics of power supply on the source side and cold and heat demand on the load side, system capacity allocation is a problem of technical and economic optimization. This paper breaks through the traditional design method based on the hourly load distribution law of typical design days and proposes a performance-oriented design method for the bidirectional full-cycle dimension storage air conditioning system based on the system’s annual operation performance, which can take into account the hourly dynamic load distribution law of every day in the full heating season and the full cooling season coupled with the bidirectional demand of cold and heat loads. A more scientific and reasonable capacity configuration scheme for the storage air conditioning system is obtained. The design is presented with a concrete case.
A mono-layer metamaterial comprising four graphene-strips and one graphene-square-ring is proposed herein to realize triple plasmon-induced transparency (PIT). Theoretical results based on the coupled mode theory (CMT) are in agreement with the simulation results obtained using the finite-difference time-domain (FDTD). An optical switch is investigated based on the characteristics of graphene dynamic modulation, with modulation degrees of the amplitude of 90.1%, 80.1%, 94.5%, and 84.7% corresponding to 1.905 THz, 2.455 THz, 3.131 THz, and 4.923 THz, respectively. Moreover, the proposed metamaterial is insensitive to the change in the angle of polarized light, for which the triple-PIT is equivalent in the cases of both x- and y-polarized light. The optical switch based on the proposed structure is effective not only for the linearly polarized light in different directions but also for left circularly polarized and right circularly polarized light. As such, this work provides insight into the design of optoelectronic devices based on the polarization characteristics of the incident light field on the optical switch and PIT.
Abstract A silicon-graphene-silica periodic graphene metamaterial, comprising of a graphene-strip, graphene-block, and graphene-ribbon, is proposed to realize dynamic triple plasmon-induced transparency (PIT). Coupled mode theory is employed to explain this phenomenon, and the results are in close agreement with the finite-difference time-domain simulation. It is interesting to note that the triple-PIT can also be realized by using silver instead of graphene and silicon layer. When the Fermi level of the graphene is 0.75 eV, the difference of the triple-PIT based on the two structure types is easily analyzed because the resonant frequencies are effectively coincident. As a result, the structure of graphene exhibits better absorption characteristics compared with that of silver, however, it decreases with increasing Fermi levels within graphene. Thus, the higher Fermi level of graphene is not suitable for the absorbers. Furthermore, the anomalous property of graphene triple-PIT that is attributed to the interaction way of the dark mode differing from the bright mode is analyzed compared with the silver triple-PIT, and it can be used to compensate for the defects of silver PIT. This study is significant for the absorber for which the graphene is utilized. The insights gained from the comparison between metal and graphene are crucial to the design of the metamaterials for which graphene and metal are used.
Aiming at the planning of zero carbon park under the background of double carbon, tins paper takes an industrial park as an example, and analyzes and evaluates the industrial planning situation, energy resources situation and energy plaiming situation of the park based on the concept of “passive priority, active optimization”. Taking the project as the blueprint, integrating the building energy-saving measures and the advanced nature and carbon reduction ability of the integrated smart energy technology, starting from the overall optimization layout of the park, covering the industrial structure, buildings, transportation, energy and other key areas of the park, the comprehensive application of low-carbon technology forms such as building micro-environment, ultra-low energy consumption building system, efficient integrated energy system and renewable energy. Total carbon emissions as the core goal, to achieve the goal zero carbon zone. This study for the project and project time zero carbon building and future zero carbon park planning to provide the reference of the same kind of park.
A terahertz-band metamaterial composed of multilayer patterned graphene is proposed and triple plasmon-induced transparency is excited by coupling three bright modes with one dark mode. The Lorentz curve calculated by the coupled-mode theory agrees well with the finite-difference time-domain results. Dynamic tuning is investigated by changing the Fermi level. Multimode electro-optics switching can be designed and achieved, and the amplitude modulations of four resonance frequencies are 94.3%, 92.8%, 90.7%, and 93%, respectively, which can realize the design of synchronous and asynchronous electro-optics switches. It is hoped that these results can provide theoretical support and guidance for the future design and application of photonic and optoelectronic devices.
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