On the basis of global structure search and density functional theory calculations, we predict a new class of two-dimensional (2D) materials, titanium silicide (TiSi, TiSi, and TiSi) monolayers. They are proved to be energetically, dynamically, and thermally stable and own excellent mechanical properties. Among them, TiSi is a ferromagnetic metal with a magnetic moment of 1.37 μ/cell, while TiSi is an ideal catalyst for the hydrogen evolution reaction with a nearly zero free energy of hydrogen adsorption. More importantly, electron-phonon coupling calculations suggest that TiSi is a robust 2D phonon-mediated superconductor with a transition temperature of 5.8 K, and the transition temperature can be enhanced up to 11.7 K under a suitable external strain. The versatility makes titanium silicide monolayers promising candidates for spintronic materials, hydrogen evolution catalysts, and 2D superconductors.

This article aims to investigate the impact of financial support on output of township and village enterprises (TVEs) during 2007 to 2013. We use panel data of 28 provinces of China to study the heterogeneous effects of financial support on output of TVEs by introducing control variables and financial support variables of interaction terms and panel threshold model. This article uses the counterfactual measurement method to measure the actual contribution of financial support toward the output of TVEs. The results show that there is an inverted-U relationship between financial support and output of TVEs. Foreign capital participation and economic development enhance the driving effect of financial support, whereas, export intensity, fiscal support, and expansion of enterprise scale reduce the financial support effect. Regional analyses indicate that financial support in the central region of China has a significant positive effect; however, the effect of financial support is not significant in the western region. Furthermore, the contribution of financial support to the total output is 16% to 18% in the eastern region, and 14% to 16% in the central region.

To test the energy-saving effect of command-and-control policies, this research evaluates the impact of “Roadmap for China Phasing Out Incandescent Lamps” on the promotion of energy-efficient lighting products. We use the difference-in-difference (DID) model to investigate the influence of the policy on the promotion of LED lighting products at home and abroad based on 440 panel data from 22 LED lighting companies from 2011 to 2020. The results indicate that, compared with the control group, the sales revenue of LED lighting products in the treatment group increased in China and in foreign markets. In addition, the policy has had a more significant impact on the promotion of LED lighting abroad than in China.

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