Yuan Feng

© 2016 Elsevier B.V.The evaporative-cooling roof is a popular passive energy conservation technique. This article presents a novel approach for modelling and analysing the influence of evaporation on roof thermal performance. A multivariate nonlinear model was developed for the prediction of the evaporation rate from porous tile. A computer program was then developed based on the one-dimensional roof unsteady heat transfer theory. Finally, the computer program and hourly weather data of Guangzhou, China, were used to analyse the impacts of evaporation and slope orientation on roof thermal performance. Evaporation beginning at 11:00 can reduce the external surface temperatures of a horizontal roof and 30°-inclined east-sloping and west-sloping roofs by up to 11.3, 10.7, and 9.8 °C, respectively, from those of a non-evaporative roof. This, in turn, can reduce the peak-hour internal surface heat flux. Additionally, with the horizontal roof, the reduction in the peak-hour heat flux can be doubled if the evaporative layer is frequently replenished with water.

This study explores the impact of government informatization construction on corporate digital technology innovation. It uses the integration of informatization and industrialization pilot zones in China as a quasi-natural experiment of government informatization construction, and construct a difference-in-differences model. Based on a sample of Chinese A-share corporations from 2007 to 2021, the empirical findings reveal that government informatization construction significantly promotes corporate digital technology innovation by enhancing corporate attention to digital technologies and reducing transaction costs. Furthermore, the positive impact is more pronounced in the southern regions and regions with stronger intellectual property protection and high-tech and digital economy industries, as well as mature-stage corporations and corporations with higher levels of digital technology innovation. These findings provide valuable insights for implementing informatization policies and facilitating corporate digital technology innovation.

The indispensability argument for abstract mathematical entities has been an important issue in the philosophy of mathematics. The argument relies on several assumptions. Some objections have been made against these assumptions, but there are several serious defects in these objections. Ameliorating these defects leads to a new anti-realistic philosophy of mathematics, mainly: first, in mathematical applications, what really exist and can be used as tools are not abstract mathematical entities, but our inner representations that we create in imagining abstract mathematical entities; second, the thoughts that we create in imagining infinite mathematical entities are bounded by external conditions.

Studies show that research and development may not always benefit entrepreneurial firms. This paper focuses on the double-edged effect of R&D activities on attracting institutional investment in entrepreneurial firms. Based on a panel dataset of 700 listed entrepreneurial firms in ChiNext, we document: an inverted-U relationship between R&D intensity and future institutional investment, which we argue is evidence that institutional investors are concerned about R&D overinvestment; an inverted-U relationship between R&D capitalization and future institutional investment, which we argue shows suspicion of the institutional investors towards high R&D capitalization. Furthermore, by splitting institutional investors into venture capitals and non-venture capitals, we confirm that VCs have higher acceptance of both R&D intensity and capitalization as VCs have more expertise to alleviate a certain level of risks.