The article proposes a method to broach the complication and mixture of the triangular causal nexus among gross domestic product (GDP), foreign direct investment (FDI), and foreign tourist arrivals (FTA) in Thua Thien Hue (TTH) province that has not yet been studied. FDI into TTH province fluctuates unpredictably, so the study investigates the causal relationship between the triangular variables over the whole period (1995–2019) and the shortened period (2003–2019). The ARDL model is the most optimal choice due to the heterogeneity of stationary characteristics and short time series data. The shortened period has established more statistically significant short- and long-term Granger causal relationships, excluding the economic crisis effect. The Granger causality test only underlined a unidirectional short-term relationship running from FTA to FDI in the shortened period. Policies for economic development in TTH province need to strengthen the coordination between foreign investment and tourism so that all economic sectors can jointly create spillover effects on economic growth.
The System of Rice Intensification (SRI) is an eco-friendly approach that aims to increase rice yield, reduce required inputs, and improve rural households' income without burdening the environment. This paper investigates the factors that influence the adoption of the SRI practice in rice production and the impact of the SRI adoption on rice yields in the upland region of Central Vietnam. Utilizing the stratified random sampling method, 239 rice farmers in Quang Nam and Thua Thien Hue provinces were selected for the study. Our study employed the logit model to identify the determinants of SRI adoption and found that the age of respondents had a significant and negative effect on the adoption of SRI. In contrast, the amount of family labor, number of plots, and access to credit had significant positive effects on farmers’ decision to adopt SRI. In addition, the results showed that when rice farmers adopted SRI, their yields increased by 15.1% on average. Regarding the policy implications, the results suggest a need for a coordinated policy between the Vietnamese government and farmers to support the implementation of the SRI method in mountainous areas, especially to train farmers to use the SRI technique.
The hydrogen production from water electrolysis is of interest as a renewable energy generation technology. However, the high price of noble platinum (Pt) catalysts for the hydrogen evolution reaction (HER) is a big challenge to use it. Herein, we fabricate cost-effective CoPt bimetallic alloys and explore the effect of Co composition on the electrochemical behavior of such alloys, which has been rarely reported. A series of Co1-xPtx (x = 0.25; 0.5; 0.75) alloys are prepared via a room-temperature chemical reduction route without using any surfactants/stabilizers that exhibit a uniform distribution in small particle sizes (ca. 3 nm) on the carbon surface. In terms of the HER, the incorporation of a suitable Co proportion into the Pt lattices enhance significantly the HER performance in an acidic environment. For instance, the Co0.5Pt0.5 NPs/C catalyst displays a low onset potential (16.67 mV) and a small Tafel slope (19.60 mV dec-1), which is different from other Co1-xPtx catalysts and commercial C-supported Pt (NPs) catalyst. This research result not only supplies a facile strategy to synthesize alloys but also guides the choice of a suitable proportion of transition metal into Pt lattice for electrochemical reactions in green energy storage and conversion technologies.
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