Female leadership, internet use, and performance of agricultural cooperatives in Vietnam

Supporting agricultural cooperatives might contribute to the livelihood improvement of many small-scale farmers in developing countries. This research examines the factors affecting the internet use of agricultural cooperatives with a focus on female leadership, its effects on cooperatives’ economic, social, and innovative performance, and the distributional effects of internet use on economic performance. Our analysis relied on the data of 3,512 agricultural cooperatives collected in 2021 from Vietnam. We addressed the endogeneity issue of internet use in impact assessment by employing an instrumental variable approach. Our results show that female leadership was positively and significantly associated with internet use and that internet use had a positive and significant effect on returns on assets, returns on equity, labor productivity, payment per laborer, contribution to labor union and insurance per laborer, and innovation in products of agricultural cooperatives. In addition, unconditional quantile regressions show that internet use in agricultural cooperatives exacerbated income inequality. Enhancing female leadership and promoting rural education were recommended to improve agricultural cooperatives’ performance

Stability of the 1144 phase in iron pnictides

A series of iron arsenides (e.g., CaRbFe4As4, SrCsFe4As4) have been discovered recently, and have provoked a rise in superconductor searches in a different phase, known as the 1144 phase. For the presence of various chemical substitutions, it is believed that more 1144 compounds remain to be discovered. In this work, we perform general model analysis as well as scenario calculation on a basis of density functional theory to investigate phase stability in a variety of compounds. We predict that the 1144-type phase could be stabilized in EuKFe4As4, EuRbFe4As4, EuCsFe4As4, CaCsFe4P4, SrCsFe4P4, BaCsFe4P4, InCaFe4As4, InSrFe4As4, etc. Remarkably, it involves rare earths, trivalence elements (e.g., indium) and iron phosphides, which greatly expands the range of its existence and suggests a promising prospect for experimental synthesis. In addition, we find that the formation of many random doping compounds (e.g., Ba0.5Cs0.5Fe2As2, Ba0.5R0.5Fe2As2) is driven by entropy and could be annealed to a 1144-type phase. Eventually, we plot a phase diagram about two structural factors Delta a and Delta c, giving a bird\u27s-eye view of stability of various 1144 compounds

Security risks from climate change and environmental degradation: implications for sustainable land use transformation in the Global South

Climate change and environmental degradation remain the most complex challenges that present and future generations of humankind face and raise several security risks that have received relatively little attention in the literature. This paper aims to review the evidence of security risks arising from these challenges in the Global South and to provide forward-looking perspectives on how to increase the resilience of affected individuals and communities. We see diverse land use strategies as a key element to drive a transformation towards greater sustainability and resilience. We propose that rural land use in the Global South should be geared towards the promotion of resource and biodiversity conservation, the development of agroforestry, tree-based farming systems, the diversification of crops, and the utilization of climate-resilient cultivars, and neglected and under-utilized plants. These actions would contribute to addressing the security risks stemming from the interconnected challenges of climate change and environmental degradation

A Systematic and Critical Review on the Research Landscape of Finance in Vietnam from 2008 to 2020

This paper endeavors to understand the research landscape of finance research in Vietnam during the period 2008 to 2020 and predict the key defining future research directions. Using the comprehensive database of Vietnam’s international publications in social sciences and humanities, we extract a dataset of 314 papers on finance topics in Vietnam from 2008 to 2020. Then, we apply a systematic approach to analyze four important themes: Structural issues, Banking system, Firm issues, and Financial psychology and behavior. Overall, there have been three noticeable trends within finance research in Vietnam: (1) assessment of financial policies or financial regulation, (2) deciphering the correlates of firms’ financial performances, and (3) opportunities and challenges in adopting innovations and ideas from foreign financial market systems. Our analysis identifies several fertile areas for future research, including financial market analysis in the post-COVID-19 eras, fintech, and green finance

Cu–Fe Incorporated Graphene-Oxide Nanocomposite as Highly Efficient Catalyst in the Degradation of Dichlorodiphenyltrichloroethane (DDT) from Aqueous Solution

Fe/graphene oxide and Cu–Fe/graphene oxide nanocomposite were synthesized by the atomic implantation method to study the photocatalytic degradation of dichlorodiphenyltrichloroethane (DDT). The synthesized nanocomposites were characterized by the XRD, N2 isotherms, SEM with EDX, TEM and XPS analysis. Characterization results have reported that oxides of Cu and Fe were uniformly distributed on graphene oxide and exited in the form of Cu+ and Fe2+ ions in Cu–Fe/graphene oxide nanocomposite. The high photocatalytic DDT removal efficiency 99.7% was obtained for Cu–Fe/graphene oxide under the optimal condition of 0.2 g/L catalyst, 15 mg/L H2O2 and pH 5. It was attributed to the reduction of Fe3+ to Fe2+ by Cu+ ions and –OH radicals formation. However, it was dropped to 90.4% in the recycling study by leaching of iron and without a change in phase structure and morphology

Phase diagram of the one-dimensional extended attractive Hubbard model for large nearest-neighbor repulsion

We consider the extended Hubbard model with attractive on-site interaction U and nearest-neighbor repulsions V. We construct an effective Hamiltonian H_{eff} for hopping t<<V and arbitrary U<0. Retaining the most important terms, H_{eff} can be mapped onto two XXZ models, solved by the Bethe ansatz. The quantum phase diagram shows two Luttinger liquid phases and a region of phase separation between them. For density n<0.422 and U<-4, singlet superconducting correlations dominate at large distances. For some parameters, the results are in qualitative agreement with experiments in BaKBiO.Comment: 6 pages, 3 figures, submitted to Phys. Rev.