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Once again in this study, we emphasizes strongly on applications of mathematical solutions for industrial uses. By using qualitative analysis, synthesis and inductive methods, together with statistic data, our paper target is to analyze aspects of SWOT analysis on blockchain technology and its opportunities for various industries and sectors in emerging markets such as Vietnam. This is based on the original foundation theory indicating that blockchain tech functioned as a mathematical solutions that can be applied for solving commerce secrets, with high data security and can be used for intellectual property. Among our research results is findings on the connection between IoTs - Internet of Things and blockchain tech, as well as relationship between AI - Artificial intelligence and blockchain tech. Last but not least authors propose cybersecurity risk solutions and there are policies implications attached.

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Microplastics (MPs) are increasingly being studied because they have become ubiquitous in aquatic and terrestrial environments. For example, little is known about the negative effects of co-contamination by polypropylene microplastic (PP MPs) and heavy metal mixtures on terrestrial environment and biota. This study assesses the adverse effects of co-exposure to PP MPs and heavy metal mixture (Cu 2+ , Cr 6+ and Zn 2+ ) on soil quality and the earthworm Eisenia foetida. Soil samples were collected in the Dong Cao catchment, near Hanoi, Vietnam, and analyzed for changes in extracellular enzyme activity and carbon, nitrogen and phosphorus availability in the soil. We determined the survival rate of earthworms Eisenia foetida that had ingested MPs and two doses of heavy metals (the environmental level -1X -and its double -2X). Earthworm ingestion rates were not signi cantly impacted by the exposure conditions but the mortality rate for the 2X exposure conditions was 100%. Metals-associated PP MPs stimulated the activities of β-glucosidase, β-N-acetyl glucosaminidase and phosphatase enzymes in soil. Principle component analysis showed that these enzymes were positively correlated with Cu 2+ and Cr 6+ concentrations, but negatively correlated with microbial activity. Zn 2+ showed no correlation with soil extracellular enzyme activity or soil microbial activity. Our results showed that co-exposure of earthworms to MPs and heavy metals had no impact on soil nitrogen and phosphorus but caused a decrease in total soil carbon content, with a possible associated risk of increased CO 2 emissions.

The study aims to evaluate the economic efficiency of the three-rice-crop and the two-lotus-crop model in Thap Muoi District, Dong Thap Province. The study data were collected from 158 farmers (98 households producing three rice crops per year, 60 remaining households plant two lotus crops per year) by stratified random sampling. The research result shows that both models above bring economic benefits to farmers. However, the two-lotus-crop model is less costly, the selling price is stable and tends to increase. Moreover, it takes advantage of idle labor in the family, so its economic efficiency is higher than the three-rice-crop model. Keywords: economic efficiency, three-rice-crop model, two-lotus-crop model.