Bøger af Hung Nguyen

Recently, climate change is the key issue that the world has to face. Renewable energy is considered as a potential technology to stop the global warming and also meet the energy demand. However, renewable sources are unstable and therefore need a conversion method to store electricity generated. Solar liquid fuel is a possible method to store renewable energy in liquid form. This research project concentrates to solar to liquid fuel. Formic acid is chosen as a case study. The project will demonstrate the technology that convert solar energy into formic acid and store at the ambient conditions. The simulations will compute the electricity generated by PV system in daily and monthly and the mass of formic acid could be produced by using solar energy. The two-axis solar tracking system is simulated for the PV panels. Two important parameters of the two-axis solar tracker are investigated: the elevation angle and Azimuth angle. The results will be illustrated in tables and figures. The research also considers the application of formic acid in direct formic acid fuel cell.

Dette er en flergangsbog til danskundervisningen på sprogskolerne.TilgangOrdbøgerne er udviklet til brug i danskundervisningen på sprogskoler og til generel sprogtilegnelse for nye borgere i Danmark.Ordlisterne er udarbejdet med afsæt i ordlister fra Dansk Flygtningehjælp. Der er forklaringer på de danske ords forskellige betydninger med mange eksempler, og ordbøgerne har særligt fokus på det sprog, som er nødvendigt for at kunne skabe sig i hverdag i Danmark.Med disse ordbøger kan kvaliteten i danskundervisningen øges, idet timerne i klassen kan koncentreres om undervisningen og ikke sinkes af omstændelige ordforklaringer.IndholdDansk-vietnamesisk ordbog indeholder ca. 10.000 danske opslagsord, som er oversat til vietnamesisk. Ordbogen indeholder ikke lydskrift.

Speaking test topics chosen according to the test-takers' area of expertise can be used to assess their speaking abilities to talk about general background knowledge or their academic subject areas. Recent studies have indicated that the topic choice affects testing performance on the oral tests, but provided inclusive results regarding the effect of general and specific-field topics on the test takers' oral performance. The aim of this research study is to investigate what type of oral assessment instruments and more specifically what topics and tasks might be best for the purpose of assessing Vietnamese faculty's oral English proficiency in the academic workplace. The results showed no significant difference in the faculty speaking performance on the general and academic field-specific topics. The findings of the research have important implications for assessing oral production in specific-purpose language testing and for providing information about the needs of Vietnamese faculty for training in spoken English for the academic workplace.