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The Determinants of Environmental Information Disclosure in Vietnam Listed Companies
NGUYEN, Thi Le Hang,NGUYEN, Thi Thu Hien,NGUYEN, Thi Thanh Huyen,LE, Thi Hong Anh,NGUYEN, Van Cong Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.2
Environmental pollution and climate change in Vietnam are now becoming a major concern. This situation is increasing the pressure on the companies to improve their social responsibility in production and business activities and disclose the environmental information to meet the requirements of stakeholders. This study investigates the internal and external factors of the company that affects the environmental information disclosure of listed companies on the Vietnam stock market as business sector, firm size, corporate manager perceptions, profitability, financial leverage, community pressure, pressures from stakeholders, government pressure influencing environmental information disclosure. Analytical data collected through the survey of 120 listed companies on the Ho Chi Minh City Stock Exchange (HOSE). By testing Cronbach's Alpha, exploratory factor analysis (EFA) and logistic regression analysis, the results of the study show that the level of environmental information disclosure of listed companies on the stock market in Vietnam depends heavily on government regulations, followed by the pressure from stakeholders, community pressure, views of business managers, companies size, business sector, and particularly profitability and financial leverage factors that have a negative relationship with environmental information disclosure.
Seed Dormancy and Germination Characteristics of Rumex obtusifolius
Thi Hien Le,Sug-Won Roh,Mirjalol Umurzokov,Aung Bo Bo,Weiqiang Jia,Kwang Min Cho,Kee Woong Park 한국잡초학회 2021 Weed & Turfgrass Science Vol.10 No.2
Exotic weeds are considered as one of the major threats for agro-ecosystem and global food security. Since, Rumex obtusifolius is one of the dominant exotic weeds in Korean landscape, turfgrass, or river banks, there is an urgency for its efficient management to protect the Korean agro-ecosystem. This study was conducted to investigate the germination characteristics under various environmental conditions such as seed dormancy, temperature, salt stress as well as effect of soil depths on seed emergence. R. obtusifolius seeds germinated 100% until 30 days after harvesting (DAH), after that the seed germination rate started to decrease until 270 DAH. The germination rate recovered from 300 DAH and finally reached 98.3% 360 DAH. Optimum temperature for R. obtusifolius seed germination was 25/15℃ to 30/20℃ (day/night). NaCl greatly affected the germination of R. obtusifolius seeds. Less than 50% of seeds germinated at 20 mM of NaCl and ceased at 320 mM. R. obtusifolius seedling emergence was strongly inhibited by burial depth. The germination declined with increasing the soil depth and stopped where the burial depth exceeded 3 cm. These results could be useful to develop integrated exotic weed management in the R. obtusifolius infested area in Korea.
Synthesis and Characterization of Nitrogen-doped Activated Carbon by Using Melamine
Hien Ngoc Thi Le,정혜경 한국물리학회 2015 새물리 Vol.65 No.1
A simple method to synthesize nitrogen-doped activated carbon by using simple thermal treatment of a mixture of activated carbon and melamine was introduced. About 6 at% of nitrogen were successfully doped into the activated carbon, and it affected the electrochemical properties dramatically. The nitrogen-containing groups could be intercalated and diffused into the pores of the activated carbon and blocked them, resulting in decreased surface area and volume. However, the cyclic voltammetric current density was significantly increased in the nitrogen-doped activated carbon compared to the bare activated carbon, demonstrating the positive effect of nitrogen doping on the performance of supercapacitors and energy storage devices.
Chemical constituents of the Annona glabra fruit and their cytotoxic activity.
Hien, Nguyen Thi Thu,Nhiem, Nguyen Xuan,Yen, Duong Thi Hai,Hang, Dan Thi Thuy,Tai, Bui Huu,Quang, Tran Hong,Tuan Anh, Hoang Le,Kiem, Phan Van,Minh, Chau Van,Kim, Eun-Ji,Kim, Seung Hyun,Kang, Hee Kyoun Swets Zeitlinger 2015 PHARMACEUTICAL BIOLOGY Vol.53 No.11
<P>Traditional Chinese medicines have attracted increasing interest as potential sources of novel drugs with a wide range of biological and pharmacological activities. Annona glabra Linn (Annonaceae) is used in traditional medicine as an anticancer drug. Phytochemical investigation of this plant led to the isolation of acetogenins, ent-kauranes, peptides, and alkaloids. In addition, compounds exhibited anticancer, anti-HIV-reserve, and antimalaria.</P>
Le, Hien Thi Ngoc,Jeong, Hae Kyung Pergamon Press 2017 Electrochimica Acta Vol. No.
<P><B>Abstract</B></P> <P>The γ-cyclodextrin–graphite oxide–carbon nanotube (γCD–GO–CNT) composite has shown the best capability and sensitivity of supramolecular recognition compared to the other two CD-GO-CNT composites (αCD-GO-CNT and βCD-GO-CNT) in our previous study. The biggest CD (γCD) was very important in the formation of the supramolecular complex and made the detection of the biomolecules easier. In this report, significantly improved supramolecular recognition capability of γCD–GO–CNT is introduced by using thermally reduced GO (TRGO), instead of typical GO. New synthesized γCD–TRGO–CNT composite film shows lower electrochemical impedance, higher carbon to oxygen atomic ratio, and larger surface area compared to the γCD–GO–CNT composite film, resulting in higher sensitivity and capability in the supramolecular recognition. The sensitivity, defined as the slope of the maximum response current versus guest molecule concentration graph, increases significantly from 4.42 to 9.44 for dopamine and from 2.21 to 4.15 for ascorbic acid. The excellent enhancement of the supramolecular recognition of the γCD–TRGO–CNT composite is attributed to TRGO. It is, therefore, concluded that it is very important to load γCD in the composite as well as to decrease the electrochemical impedance for effective electrochemical biosensors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The γ-cyclodextrin- thermally reduced graphite oxide-carbon nanotube composite film was successfully synthesized. </LI> <LI> The γCD-TRGO-CNT composite shows enhanced supramolecular recognition capability compared to the γCD-GO-CNT composite. </LI> <LI> Sensitivity of the γCD-TRGO-CNT composite dramatically increased by a factor of two compared to the γCD-GO-CNT composite. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Electrochemical Properties of Silicon Dioxide Particles synthesized by Using Sol-gel Method
Hien Ngoc Thi Le,정혜경 한국물리학회 2013 새물리 Vol.63 No.2
A novel way to synthesize silicon-dioxide particles by using silicon tetrachloride and 2- methoxyethanol and a sol-gel method has been developed. Different sizes and densities of the silicon-dioxide (SiO2) particles were formed on Ni foils at different spin-coating speeds of 2000, 3000, and 4000 rpm for 20 seconds. Scanning electron microscopy results showed that SiO2 particles had been at all speeds and that the distribution of particles at 4000 rpm was the best. Cyclic voltammetry and electrochemical impedance spectroscopy were also used to characterize the electrochemical properties of the obtained samples for energy-storage-device applications