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Predicting Financial Distress Distribution of Companies
Giang Huong VU(Giang Huong VU ),Chi Thi Kim NGUYEN(Chi Thi Kim NGUYEN ),Dang Van PHAM(Dang Van PHAM ),Diu Thi Phuong TRAN(Diu Thi Phuong TRAN ),Toan Duc VU(Toan Duc VU ) 한국유통과학회 2022 유통과학연구 Vol.20 No.10
Purpose: Predicting the financial distress distribution of an enterprise is important to warn enterprises about their future. Predicting the possibility of financial distress helps companies have action plans to avoid the possibility of bankruptcy. In this study, the author conducted a forecast of the financial distress distribution of enterprises. Research design, data and methodology: The forecasting method is based on Logit and Discriminant analysis models. The data was collected from companies listed on Vietnam Stock Exchange from 2012 to 2020. In which there are both companies suffer from financial distress and non-financial distress. Results: The forecast analysis results show that the Logistic model has better predictability than the Discriminant analysis model. At the same time, the results also indicate three main factors affecting the financial distress of enterprises at all three research stages: (1) Liquidity, (2) Interest payment, and (3) firm size. In addition, at each stage, the impact of factors on financial distress differs. Conclusions: From the results of this study, the author also made several recommendations to help companies better control company operations to avoid falling into financial distress. Adjustments to current assets, debt, and company expansion considerations are the most important factors for companies.
Investigation of Magnetic Anisotropy in Ultra-thin Co Films Grown on 2-D Materials
Pham Trang Huyen Cao,Nguyen Dan Chi,Thi-Nga Do,Soo Min Kim,Chanyong Hwang,Tae Hee Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
2D materials have unique physical and chemical properties which can be used for spintronic device applications, such as the long spin relaxation time of graphene. Additionally, the related heterostructures provide the unprecedented probability of combining the different characteristics via the proximity effect. In this work, ultra-thin Co films were grown on CVD-grown Gr and h-BN layers using the UHV-MBE system. In order to characterize unconventional magnetic properties of 6 ~ 8 nm thick Co films, anisotropy of magnetic tunnel junctions (MTJs) was investigated. The MTJs of x-nm Co (x = 6 and 8)\1.6-nm MgO\12-nm Co were prepared using UHV-MBE system on CVD-grown Gr and h-BN. Perpendicular magnetic anisotropy (PMA) was clearly shown at room temperature (RT) in all the Co bottom electrodes prepared on both graphene and h-BN. Interestingly, for the MTJs grown on h-BN, a very large MR value of more than 700%, was observed with the large PMA, while a few tenth percent of MR values were measured for the Co films grown on Gr layers. Considering theoretical report of an active role of the Co/graphene interface in the magnetism of Co, which allows us to sustain PMA, analysis of interface properties between Co and 2-D materials layers is a prerequisite for understanding their magnetic properties. The development of high-quality ferromagnetic thin films in contact with 2D materials is a state-of-the-art growth technique, whereas only thick polycrystalline or three-dimensional morphologies have been demonstrated so far. We report on the growth of flat, epitaxial ultrathin Co films on h-BN and graphene using UHV-MBE deposition technique.
Nitrophenols removal from aqueous medium using Fe-nano mesoporous zeolite
Huong, Pham-Thi,Lee, Byeong-Kyu,Kim, Jitae,Lee, Chi-Hyeon Elsevier 2016 Materials & Design Vol.101 No.-
<P><B>Abstract</B></P> <P>In this study, Fe-nano zeolite was applied to the removal of ortho, meta and para-nitrophenols to evaluate its potential applications as an effective adsorbent. Scanning electron microscopy, Fourier-transformed infrared spectroscopy, and gas adsorption analysis were used to compare the advanced properties of Fe-nano zeolite with those of commercial activated carbon (AC). The Fe-nano zeolite with a greatly improved surface area was particularly effective in the removal of the nitrophenols. The maximum adsorption capacity of <I>m</I>-, <I>o</I>- and <I>p</I>-nitrophenol were 168.7, 193.9 and 223.1mg/g, respectively. These adsorbents were applied to the remediation of wastewater containing high <I>p</I>-nitrophenol concentration of 380mg/L. The results revealed 92.8% removal efficiency of <I>p</I>-nitrophenol from wastewater by Fe-nano zeolite, which is much higher than those AC (56.5%). The regeneration characteristics of the <I>p</I>-nitrophenol-loaded adsorbent were analyzed. Even after 15 adsorption-desorption cycles, the removal efficiencies of <I>p</I>-nitrophenol by Fe-nano zeolite and AC were 78.6 and 57.9%, respectively. The required adsorption cost for the treatment of 1000kg wastewater containing 380mg/L of <I>p</I>-nitrophenol using Fe-nano zeolite was 67.6% lower than that using AC. Based on these results, Fe-nano zeolite can be used as economic and effective adsorbent for removal of nitrophenols from wastewater.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fe-nano zeolite is an effective adsorbent for nitrophenol removal. </LI> <LI> Adsorption capacity of <I>m</I>-, <I>o</I>- and <I>p</I>-nitrophenol were 168.7, 193.9 and 223.1mg/g, respectively. </LI> <LI> Removal efficiency from wastewater by Fe-nano zeolite (92.8%) was much higher than AC (56.5%). </LI> <LI> Adsorption cost for treatment of 1000kg wastewater by Fe-nano zeolite was 67.6% lower than AC. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hien, Nguyen Khoa,Bao, Nguyen Chi,Ai Nhung, Nguyen Thi,Trung, Nguyen Tien,Nam, Pham Cam,Duong, Tran,Kim, Jong Seung,Quang, Duong Tuan Elsevier 2015 Dyes and pigments Vol.116 No.-
<P><B>Abstract</B></P> <P>A fluorescent chemosensor based on dimethylaminocinnamaldehyde-aminothiourea (DA) has been designed, synthesized, and applied with a combined theoretical and experimental study. The synthetic path, optimized molecular structure and characteristics of DA were carried out using the calculations at the B3LYP/LanL2DZ level of theory. The experimental investigations have a good agreement with the theoretical results. DA can be used as a chemosensor for simultaneous quantification of silver, copper, and mercury ions in aqueous solution at the ppb level. The stable geometric structures of the complexes between DA and Ag<SUP>+</SUP>, Hg<SUP>2+</SUP>, Cu<SUP>2+</SUP> with stoichiometry of 1:1, 2:1, and 2:1, have been found and investigated for electronic properties and fluorescence quenching phenomena by using Atoms in Molecules (AIM) and Natural Bond Orbitals (NBO) analyses.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A chemosensor has been studied with a combined theoretical and experimental study. </LI> <LI> Suitable for detecting trace amounts of Ag(I), Hg(II), Cu(II) ions at the ppb concentration level. </LI> <LI> High water solubility, simplicity, rapid analysis time, wide range of pH. </LI> <LI> The stable geometric structures of the complexes have been found and investigated. </LI> <LI> The fluorescence quenching of complexes is studied by using AIM and NBO analyses. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>