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- 저자 : Le Thi Nhu Trang (검색결과 4 건)
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암모니아 부하에 따른 프로피온산 중온 혐기성 소화 미생물 군집 변동 조사
Le Thi Nhu Trang,이준엽 한국환경과학회 2021 한국환경과학회지 Vol.30 No.12
The present study investigated the effect of ammonia load on microbial communities in mesophilic anaerobic digestion of propionic acid. A laboratory-scale continuous anaerobic digester treating propionic acid as a sole organic substrate was operated under non-inhibitory condition and inhibitory conditions with ammonia (1.5 g and 3.5 g ammonia-N/L, respectively), and bacterial and archaeal communities in the steady states of each ammonia condition were analyzed using high-throughput sequencing. Thirteen bacterial families were detected as abundant bacterial groups in mesophilic anaerobic digestion of propionic acid. Increase in ammonia concentration resulted in significant shifts in microbial community structures. Syntorophobacter, Pelotomaculum, and Thermovigra were determined as the dominant groups of (potential) propionate oxidizing bacteria in the non-inhibitory condition, whereas Cryptanaerobacter and Aminobacterium were the dominant groups of (potential) propionate oxidizing bacteria in the ammonia-inhibitory condition. Methanoculleus and Methanosaeta were the dominant methanogens. Acetate-oxidation coupled with hydrogenotrophic methanogenesis might be enhanced with increases in the relative abundances of Methanoculleus and Tepidanaerobacter acetatoxydans under the ammonia-inhibitory condition. The results of the present study could be a valuable reference for microbial management of anaerobic digestion systems that are exposed to ammonia inhibition and propionic acid accumulation.
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열-알칼리성 전처리에 따른 폴리하이드록시부티레이트의 혐기성 소화 개선 효과 조사
Le Thi Nhu Trang,이준엽 한국환경과학회 2022 한국환경과학회지 Vol.31 No.7
In this study, the effect of different reaction times for thermal-alkaline pretreatment on the solubilization and biogasification of polyhydroxybutyrate (PHB) were evaluated. Thermal-alkaline pretreatment tests were performed at 73 °C and pH 13 at 0-120 h reaction times. The mesophilic anaerobic batch tests were performed with untreated and pretreated PHB samples. The increase in the pretreatment reaction time results in a 52.8-98.8% increase of the abiotic solubilization efficiency of the PHB samples. The reaction time required to achieve solubilization efficiencies of 50%, 90%, and 95% were 10.5, 52.0, and 89.6 h, respectively. The biogasification of the untreated PHB samples achieved a specific methane production rate of 3.6 mL CH4/g VSS/d and require 101.3 d for complete biogasification. The thermal-alkaline pretreatment significantly improved specific methane production rate (10.2-16.0 time increase), lag time (shortened by 76-81%), and time for complete biogasification (shortened by 21-83%) for the biogasification of the PHB samples when compared to those of the untreated PHB samples. The improvement was higher as the reaction time of the thermal-alkaline pretreatment increased. The findings of this study could be used as a valuable reference for the optimization of the biogasification process in the treatment of PHB wastes.
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트란곽붕,LE THI NHU TRANG(번역자),DO HUYEN TRANG(번역자),TRAN THI HONG HA(번역자),이윤선 비교민속학회 2011 비교민속학 Vol.0 No.46
이 글은 하노이와 베트남의 100년 동안의 역사를 통해서 동쪽과 서쪽, 남쪽과 북쪽의 상호문화적 교류를 분석한 글이다. 먼저 Accultureation의 용어 개념을 살펴보았다. 이어서 베트남과 중국문화의 관계를 경제적, 정치적, 문화적 상호교류의 관점에서 분석해 보았다. 나아가 무역부흥기를 살펴보고, 베트남과 프랑스의 관계를 중심으로 동쪽과 서쪽의 문화적 교류를 설명하였다. 특히, 베트남과 하노이의 문화 상호교류 과정을 통해서 베트남의 정체성과 문화적 본질을 규명해보고자 했다. 베트남의 남부와 북부에 있어서 정치적, 문화적, 경제적 변별성이 존재한다. 문학, 미술, 예술 특히 회화의 생성과 발전과정을 분석하고, 민속문화가 어떻게 조응하는지에 대해서도 살펴보았다. 인도차이나의 천년 수도인 하노이를 중심으로 호치민시와의 관련성 속에서 베트남 문화의 속성에 대해서 규명하고자 했다. This study has its purpose on analyzing cultural interactions of the east and the west and the north and the south with the 100 years" history of Hanoi and Vietnam. The study, first, considers the concept of the term, “Acculturation”, and subsequently analyzes the cultural relation between Vietnam and China with the view point of economical, political, and cultural interaction. Futhermore, the study examines the revival period of trades, and explains the cultural interchanges between the east and the west. Especially, the study would figure out Vietnamese identity and cultural essence with the cultural interaction process of Vietnam and Hanoi. There exist political, cultural, economical distinctions between the south Vietnam and the north Vietnam. At this aspect, the study also analyzes the generation and development process of literature, fine arts and art especially paintings. With the analysis, the study examines about how folk culture makes accordance. Ultimately, the study would like to figure out the attributes of Vietnamese culture in the relevance with Ho Chi Minh City centering into Hanoi where is the thousand-year capital city of Indochina.
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The Impact of COVID-19 Pandemic on Firm Performance: Empirical Evidence from Vietnam
BUI, Trung Huy,NGUYEN, Huong Thu,PHAM, Yen Nhu,NGUYEN, Trang Thu Thi,LE, Linh Thao,LE, Giang Thu Tran Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.7
The outbreak of Coronavirus disease 2019 (COVID-19) has caused serious impacts not only on human health but also on the economies around the world. Enterprises play an important role in the development of every country but it is also one of the most affected sectors during the pandemic. Drawing on panel data of 131 enterprises listed on the Vietnamese stock exchange from 2016Q1 to 2021Q3, this study aims to investigate the impact of the COVID-19 pandemic on firm performance. Enterprises are classified into seven industries including Agriculture, Material, Industry, Real estate and Construction, Energy, Consumer, and Service. The paper also analyzes the variation of the effects among companies, focusing on differences in revenue and capital structure. The results show that the COVID-19 pandemic negatively affects business performance. In addition, the empirical findings indicate that revenue and debt decreasing can cause deterioration of firm performance during the pandemic period. The decrease in revenue has a direct impact on firm profitability. The reduction of debt levels affects the corporate leverage leading to adverse effects on firm performance. The negative effect is more pronounced for companies in some specific sectors including industry, real estate, construction, consumption, and services.
KCI
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