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- 저자 : Nguyen Nhat Ha Vy (검색결과 2 건)
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Nguyen Nhat Ha Vy,Sang-Kuck Chung 한국재무학회 2019 한국재무학회 학술대회 Vol.2019 No.05
This paper examines the multi-scale relationships among macroeconomic variables the interest rate, the exchange rate and stock price using the Time-varying parameter – Vector autoregressive model. In particular, we apply the TVP-VAR model with the Markov chain Monte Carlo method and the use of monthly data from August 2000 to April 2016 for analyzing the exchange rates, two versions of stock indices and treasury bill interest rates in the Vietnamese economy. Our study shows that there is an increase in the simultaneous relation of the exchange rates to the stock price shock, the positive persistently simultaneous relation of the interest rate to the stock price shock and the negative persistently of the interest rates to the exchange rates. Therefore, there are different macroeconomic performances in the Vietnamese economy, which indicate the possibility of critical structural changes in the economy over time. Besides, remarkable changes in the relations between the macroeconomic variables are shown by the time-varying impulse responses compared with those estimated by a constant parameter VAR.
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Nguyen Thi Mai Tho,Bui The Huy,Dang Nguyen Nha Khanh,Ho Nguyen Nhat Ha,Vu Quang Huy,Ngo Thi Tuong Vy,Do Manh Huy,Duong Phuoc Dat,Nguyen Thi Kim Phuong 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.12
Novel highly active visible-light photocatalysts in the form of zinc bismuth oxide (ZnBi2O4) and graphite hybrid composites were prepared by coupling via a co-precipitation method followed by calcination at 450 oC. The asprepared ZnBi2O4-graphite hybrid composites were tested for the degradation of rhodamine B (RhB) solutions under visible-light irradiation. The existence of strong electronic coupling between the two components within the ZnBi2O4- graphite heterostructure suppressed the photogenerated recombination of electrons and holes to a remarkable extent. The prepared composite exhibited excellent photocatalytic activity, leading to more than 93% of RhB degradation at an initial concentration of 50mg·L1 with 1.0 g catalyst per liter in 150min. The excellent visible-light photocatalytic mineralization of ZnBi2O4-1.0graphite in comparison with pristine ZnBi2O4 could be attributed to synergetic effects, charge transfer between ZnBi2O4 and graphite, and the separation efficiency of the photogenerated electrons and holes. The photo-induced h+ and the superoxide anion were the major active species responsible for the photodegradation process. The results demonstrate the feasibility of ZnBi2O4-1.0graphite as a potential heterogeneous photocatalyst for environmental remediation.
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