We study the optical force on the graphene-coated low-index microparticle by the first-order Bessel beam lighting. We theoretically demonstrate that the optical scattering pulling force is realized near the Fano resonance due to the interference between electric dipole mode and quadrupole one. Moreover, the optical force can be further enhanced and flexibly tuned by controlling the conductivity of the graphene. In order to transport the particle over a long distance, the stability for optical trapping at transverse plane is also analyzed. Our study might offer a new thought to trap and transport dielectric or plasmonic particles, as well as provide potential applications in optical manipulation and optoelectronic devices.
Electricity consumption accounts for a considerable part of the final energy consumption, and it is important for economic development and human life. This study explores the spatiotemporal evolution characteristics and influencing factors of electricity consumption in the Yangtze River Delta region in China from 2006 to 2019, using the gravity model and Logarithmic Mean Divisia Index method, respectively. The results show that: (1) The centers of gravity for the total final, industrial and residential electricity consumptions have a trend of migration towards the west. (2) The distance of migration of the center of gravity for residential electricity consumption is the highest, and the trend of migration of the center of gravity for industrial and total final electricity consumptions are synchronous. (3) Economic development is the main reason for the growth in regional electricity consumption, and the decrease in the investment electricity consumption intensity inhibits the growth of electricity consumption. This study provides references to restrain the excessive increase in electricity consumption and improve the layout of power facilities at the regional level.
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