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Faced with various crises caused by human activity, our civilization desperately needs solutions to achieve sustainable development. As a result, the green financial system has just taken root in China to respond to the climate emergency that hangs over the whole world in general and China in particular, due to its rapid industrial and urban development. This research is exploratory and analytical. The tenacity of this broadsheet is to sightsee the recent nature of the green financial system, its development, the constraints related to its growth, and its future direction for green economic development. First, research mentions the existing literature and then shows that since its implementation, Chinese green finance, through its offshoots, has rapidly gained momentum among public and private investors; despite this rise, there is a lack of development of green bonds and green insurance and an even greater lack of innovation in other types of products. Secondly, this work indicates the significant contribution that the provision of green bond products makes to a country's economic growth and CO2 reduction. Finally, the study shows that despite the tireless efforts the Chinese government has put into greening the economic system, much remains to be done to respond favorably to the objectives of the sustainable expansion of green funding. For example, with the formation of an incorporated green economic system, much more remains to be done with respect to the responsibility of companies and other actors to disclose green financial information, and also in the creation of incentives to promote green consumption.

The Covid-19 global pandemic has been the greatest threat to the world’s economy as a whole since the Great Economic Depression of 1929. The Guinean economy, like other countries around the world, has not escaped the clutches of this coronavirus-19 health crisis since its appearance until its advent in Guinea in March 2020. The objective of this paper is to not only provide a general overview of the impact of this health crisis on the country's economy but also to examine restrictive measures put in place by the government to ease the health, human and socio-economic impact of the pandemic, through case study methodology and review of data and reports from the National Agency for Health Security-Guinea (ANSS), the Central Bank of Guinea, the Ministry of Health of Guinea, The Private Investment Promotion Agency (APIP-Guinea), the World Health Organization (WHO). The results show us that the Guinean economy has registered in the face of COVID-19, this by the government's many devices and the immediate adoption of technological tools by some entrepreneurs. On this side, there are some entrepreneurs who have closed their businesses because of non-state assistance.

The influence of phase-field parameters on dendritic side-branches is studied by using a phase-field model coupled with thermal noise. The result of calculation indicates that, the thermal diffusion layer collected around the dendrite tends to become thinner with the undercooling increasing, which is favorable to the growth of the side-branches and the dendrite takes on the morphology of developed side-branches; The less coupling coefficient is, the quicker the dendrite tip velocity converges on the Green function calculation, the more developed the side-branches are; The anisotropy coefficient " influences the steady state of the dendrite tip, the largeris, the greater the dendrite tip velocity is, the more developed the side-branches are and the smaller the DAS is; The magnitude of thermal noise F u has an obvious effect upon temperature field, when appropriate value is assigned to F u , the noise can promote the emergence of side-branches, but it does not influence the tip operating state.