With the aim to reduce the total structural weight, this paper presents a novel radial multilayered elastic metamaterial (EM) shaft in which the scattering layer is circumferentially discretized into several arc-shaped sections with rotational symmetry. The dispersion relations and frequency-response-functions (FRF) of a finite structure are determined numerically first with different discretized geometries. To illustrate the mechanisms of band gaps, the eigenmodes were extracted and analyzed together with dispersion relations and FRF. The results show that in contrast to conventional multi-layered EM shafts, the proposed EM shaft with the weight being reduced by 34% can still yield broadband gaps at low-frequencies and by properly selecting the discretized geometry the band gap ranging from 139 to 197Hz exists for all three elastic wave modes. The results presented in this paper demonstrate a potential design strategy in stabilized shaft engineering.

Digital inclusive finance, as an emerging force that can promote technological innovation and economic level, can provide new ideas for carbon emission reduction. Using the panel data of 30 provinces, autonomous regions and municipalities in China from 2011 to 2019, this paper explores how digital inclusive finance affects regional carbon emissions. It is found that digital inclusive finance can obviously restrain carbon dioxide emissions; The carbon emission reduction effect of digital inclusive finance is particularly significant in the central and western regions; Digital inclusive finance can improve the level of technological innovation, and its inhibition on carbon emissions is mainly through the transmission mechanism of promoting the level of technological innovation. In view of this, green-oriented digital inclusive finance should be developed; Strengthen the combination of digitalization and industrialization, and adjust and optimize the industrial layout; Formulate digital inclusive finance policy according to local conditions; Increase investment in technological innovation funds, and promote technological innovation with digital inclusive finance.