This paper evaluates the global welfare impact of China's trade integration and technological change in a multi-country quantitative Ricardian-Heckscher-Ohlin model. We simulate two alternative growth scenarios: a "balanced" one in which China's productivity grows at the same rate in each sector, and an "unbalanced" one in which China's comparative disadvantage sectors catch up disproportionately faster to the world productivity frontier. Contrary to a well-known conjecture (Samuelson 2004), the large majority of countries experience significantly larger welfare gains when China's productivity growth is biased towards its comparative disadvantage sectors. This finding is driven by the inherently multilateral nature of world trade.JEL Classifications: F11, F43, O33, O47
The study of 2D materials has been a significant and fascinating area, at least since the discovery of graphene. As one of the layered bismuth oxychalcogenides, bismuth oxyselenide (Bi 2 O 2 Se) has drawn a lot of attention recently. The study of Bi 2 O 2 Se was mainly focused on its thermoelectric performance until its ultrathin 2D structure came to the fore. New physical properties of Bi 2 O 2 Se were discovered along with the successful synthesis of 2D Bi 2 O 2 Se structures. Few-layer Bi 2 O 2 Se exhibits ultrahigh mobility, outstanding stability, tunable bandgaps, and excellent mechanical properties, showing remarkable performance in electronics and optoelectronics. In this report, an overview of recent advances in Bi 2 O 2 Se research is provided, including structure/property modifications, synthetic methods, and practical applications. Theoretical and experimental results on bulk/few-layer Bi 2 O 2 Se are both discussed in this report. Finally, the challenges and outlook for Bi 2 O 2 Se are evaluated based on current progress.
As a valuable complement to its proton-based counterpart (1H MRI/NMR), fluorine-based magnetic resonance imaging/spectroscopy (19F MRI/NMR) provides quantitative images or spectroscopy without background interference, which has become an extensively used...
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