This work intends to provide a comprehensive overview of structures and different types of lignin, as well as the recent progress in its preparation techniques. Besides, the extensive range of applications and opportunities of lignin were also discussed in detail.
In that guidance, the third statement indicates that supplement of micronutrients such as vitamins A, D, B, C, omega-3 as well as another micronutrients as zinc, iron and selenium can help to reduce adverse clinical outcomes during viral infection. Other studies suggest the effectiveness of natural products and vitamins in the inhibitory antiviral activities vs. SARSCoV-2. Herein, we resume the latest discoveries with vitamins C, D and quercetin in the prevention and treatment against the SARSCoV-2.
This study develops an advanced tool for tackling constrained optimization problems based on an integration of feasibility rules and differential evolution metaheuristic. This tool aims at finding a solution with the most desired objective function value and concurrently satisfies all of the problem constraints.
In this work, we prepared and studied spectroscopic properties of Dy3+ ions in lithiumsodium aluminoborate glasses. Judd - Ofelt theory has been used to evaluate intensity parameters Ωλ (λ = 2, 4, 6) by analyzing the absorption spectrum of ABLN: Dy3+ glass, and calculated the radiative transition probabilities, branching ratios, radiative lifetimes of 4F9/2 excited level, stimulated emission cross - section for selected.
This article is to describe and critically evaluate the issued scoring rubrics of the two productive skills – Speaking and Writing; and basing on an analysis and modification of the descriptors, to propose revised versions of the marking rubrics. The product represents the more concise and clearer rubrics.
This paper investigates the interpersonal meaning of English and Vietnamese letters to the Editors by using Appraisal Theory, which focuses on the interpersonal metafunction of language. The data were chosen from 100 samples of letters to the Editors. Attitude system was employed to find out the similarities and differences in construing interpersonal meaning between English letters to the Editors (ELTEs) and Vietnamese letters to the Editors (VLTEs).
The study empirically investigate the relationship between tourism receipts, exchange rate and economic growth in the period 1990-2017 and define whether the tourism -led growth (TLG) hypothesis for Vietnam. The study implements Vector Error correction Model, Granger causality tests, variance decomposition with data in the periods 1990 -2017.
Media relations is one of the very important tools of PR (Public Reations) and also an effective tool in handling media crisis. In addition, in the current technology boom, managing - controlling information sources on social networks is a difficult job that requires the media departments of enterprises to set up strategies and enhance skills to limit the risks brought by communication crises.
By using qualitative research methods of comparing and contrasting some experiences from various smart-tourism models of China and Korea, this study may be able to help Da Nang city improve its image significantly and foster guests’ experiences as well.
Providing readers the evaluation of the impacts of outsourcing in the hospitality industry on performance and service quality within the context that restaurants and hotels are short of staffs post COVID-19 after they attempted to cut down a number of employees in order to reduce the operational costs and maintain the operations of business establishments. Therefore, managers can utilize this approach to fill up their role positions in a short-term and gradually seek other alternative stable and skillful labours in the long-term.
