Prior literature shows that during an economic downturn firms have difficulty sustaining superior performance, and a larger percentage of firms report losses. Motivated by this literature, we explore the role of sustainability of organizational IT capability (ITC) on a firm's performance during an economic downturn. Specifically, we examine how ITC sustainability contributes to a firm's ability to recover from losses. ITC sustainability reflects a firm's ability to resist competitors' attempts to imitate or improve on its ITC. We use ITC sustainability to classify firms as sustainable (Systematic ITC), as non-sustainable (Occasional ITC), and as having no ITC (Non-ITC). Using a sample of large U.S. firms during the economic downturn of the early 2000s, we show that Systematic ITC firms achieve higher levels of firm-specific abnormal earnings and are capable of faster recovery when compared to all competitors (Occasional ITC and Non-ITC firms) and competitors with only Occasional ITC.

In this paper, a conical conformai antenna array operating in the Beidou B3 band and the GPS L1 band is proposed. The upper end of the antenna patch is shorted to the missle body to form a shorted wall for miniaturization. And an open stub is loaded to realize dual-frequency resonance. The patch is attached to a conical surface and wrapped to the missle body. The antenna element with good performance is rotated by 180 degrees to obtain a conforma! antenna array containing two units. The two elements are feed in equal amplitude and phase with the coaxial line. Finally, the proposed antenna array shows an omnidirectional radiation characteristic in the azimuth plane and the gain patters in the elevation plane are show as "8" fonts.

Both the resource environmental carrying capacity (RECC) and supply-side reform are crucial for achieving sustainable national developments. However, current research on RECC lacks consideration of the supply-side industrial structures and factors, and the relationship between RECC and supply-side reform remains unrevealed. In order to measure the RECC in China at the provincial level from 2005 to 2019, this study constructs an evaluation index based on industrial structure. It utilizes the TOPSIS model coupled with the supply-demand balance method and environmental capacity method while gathering and summarizing the indicators related to natural resource support, socio-economic support, and environmental factor accommodation. The analysis of evolutionary characteristics and spatial heterogeneity is carried out by statistical and spatial econometric methods, and the impact of the supply-side reform policy on RECC is examined using a bidirectional fixed-effect model. The findings indicate the following: (1) China’s RECC demonstrates a clear upward trend, with higher values in the west and lower values in the east. The average annual growth rate from 2016 to 2019 (18.12%) is nearly three times that of the period from 2005 to 2010 (6.28%), indicating a significant acceleration in the increase in RECC post-supply-side reform. (2) The spatial agglomeration of RECC and its sub-system support is observed, as the allocation of nature resources and markets promotes the convergence of regional differences and enhances the spatial convergence of the RECC. (3) The implementation of supply-side reform policies has a positive impact on RECC, with industrial upgrading playing a particularly significant role. This study provides a new idea and method for the selection of evaluation indicators, quantitatively assessing province-level RECC and understanding the potential effects of national supply-side policies on RECC.