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Effect of Cr, Mo and W on the Microstructure of Al Hot Dipped Carbon Steels
( Trinh Van Trung ),( Min Jung Kim ),( Soon Yong Park ),( Poonam Yadav ),( Muhammad Ali Abro ),( Dong Bok Lee ) 한국부식방식학회(구 한국부식학회) 2014 Corrosion Science and Technology Vol.13 No.1
A low carbon steel, Fe-2.25%Cr steel (ASTM T22), and Fe-2.25%Cr-1.6%W steel (ASTM T23) were aluminized by hot dipping into molten Al baths. After hot-dipping, a thin Al-rich topcoat and a thick alloy layer formed on the surface. The topcoat consisted primarily of a thin Al layer that contained a small amount of Fe, whereas the alloy layer consisted of Al-Fe intermetallics such as Al5Fe2 and AlFe. Cr, Mo, and W in T22 and T23 steels reduced the thickness of the topcoat and the alloy layer, and flattened the reaction front of the aluminized layer, when compared to the low carbon steel.
( Trinh Van Trung ),( Sun Kyu Kim ),( Min Jung Kim ),( Seul Ki Kim ),( Sung Jun Bong ),( Dong Bok Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.8
Medium carbon steel was aluminized by hot dipping into molten Al or Al-1 at% Si baths. After hot-dipping in these baths, a thin Al-rich topcoat and a thick alloy layer rich in Al5Fe2 formed on the surface. A small amount of FeAl and Al3Fe was incorporated in the alloy layer. Silicon from the Al-1 at% Si bath was uniformly distributed throughout the entire coating. The hot dipping increased the microhardness of the steel by about 8 times. Heating at 700-1000, however, decreased the microhardness through interdiffusion between the coating and the substrate. The oxidation at 700-1000 in air formed a thin protective a-Al2O3 layer, which provided good oxidation resistance. Silicon was oxidized to amorphous silica, exhibiting a glassy oxide surface.
[박막의 부식, 방식 및 마모 거동] CaO 첨가와 열간압연이 마그네슘 합금의 고온산화에 미치는 영향
Chunyu Xu,Trinh Van Trung,원성빈(Sung-Bin Won),이동복(Dong Bok Lee) 한국표면공학회 2012 한국표면공학회지 Vol.45 No.4
Magnesium alloys of AZ31, AZ31 + (0.5, 1, 1.5)wt.% CaO were cast, hot rolled, and oxidized between 450 and 650℃ in atmospheric air. The added CaO enabled to cast the AZ31 alloy in air. It decomposed and precipitated along the grain boundaries of the AZ31 alloy as Al2Ca. The more the amount of CaO was, the more Al₂Ca formed. The oxidation limit was about 450℃ for the AZ31 alloy. But, It increased to 650℃ in the CaO-added alloys. Hot rolling destroyed the precipitates that formed along the grain boundaries of the AZ31 alloy. During oxidation, MgO oxide scales that incorporated CaO formed at the outer surface of the formed oxide layer.
Duc Manh Hoang,Trinh Nam Trung,Phan Thi Thu Hien,Do Thi Ha,Hoang Van Luong,이명숙,배기환 한국생약학회 2010 Natural Product Sciences Vol.16 No.4
Protein tyrosine phosphatase 1B (PTP1B), a negative regulator of insulin signaling, has served as a potential drug target for the treatment of type 2 diabetes. The MeOH extracts of twenty-nine medicinal plants, traditionally used in Vietnam as anti-diabetes agents, were investigated for PTP1B inhibitory activity in vitro. The results indicated that, most materials showed moderate to strong inhibitory activity with IC50 values ranging from 3.4 mg/mL to 35.1 mg/mL; meanwhile, eleven extracts (37.9%) could demonstrate PTP1B activity with IC50 values less than 15.5 mg/mL; sixteen extracts (55.2%) could demonstrate PTP1B activity with IC50 values ranging from 15.5 mg/mL to 35.1 mg/mL. The study may provide a proof, at least in a part, for the ethno-medical use in diabetes disease of these plants.
High Temperature Oxidation Characteristics of CrAlMgN Thin Films between 800 and 1000 ℃ in Air
( Dong Bok Lee ),( Trinh Van Trung ),( Sun Kyu Kim ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.10
CrAlMgN films were deposited on SKD 11 tool steel by cathodic arc plasma deposition. The oxidation characteristics of the films were studied at a temperature range from 800 to 1000 ℃ for up to 50 h in air. The films displayed good oxidation resistance owing to the formation of oxide crystallites of Cr2O3 and α-Al2O3. The oxidation of CrAlMgN film occurred via complex routes such as outward diffusion of Cr, Al and nitrogen and inward transport of oxygen. The apparent activation energy for oxidation of the CrAlMgN film was determined to be 200 kJ/mol. Iron oxides were detected for specimens oxidized at 1000 ℃. (Received March 18, 2013)
Do Thi Ha,Trinh Nam Trung,Nguyen Hai Nam,Chu Van Men,Nguyen Bich Thu,Tran Thi Phuong,KiHwan Bae 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.6
The aim of the present study was to investigate effects of the ethyl acetate fraction of an ethanol extract of Coix lachryma-jobi (ECLJ) on glucose uptake and adipocyte differentiation in 3T3-L1 cells. ECLJ phosphorylated AMP-activated protein kinase (AMPK) and its downstream substrate acetyl-coenzymeA carboxylase in 3T3-L1 cells in a time- and dosedependent manner. Moreover, we discovered that compound C inhibits ECLJ-stimulated ACC phosphorylation. In addition,ECLJ exhibited a dose-dependent stimulation of glucose uptake in 3T3-L1 cells, and this increase was obviously attenuated by compound C. ECLJ also caused a decrease in the expression levels of adipogenesis factors such as fatty acid synthase, sterolregulatory-element-binding protein-1c, peroxisome proliferator-activated receptor g, and CAATT=enhancer binding protein a in a dose-dependent manner. Differentiation was examined by Oil red O staining activity after ECLJ treatment for 6 days. ECLJ decreased mean droplet size. These results suggest a possible role for AMPK in the process of adipose differentiation and that ECLJ targeted for adipocyte functions could be effective in improving the symptoms of metabolic syndrome.
Eudesmols Induce Apoptosis through Release of Cytochrome c in HL-60 Cells
Duc Manh Hoang,Trinh Nam Trung,Long He,Do Thi Ha,이명숙,김보연,Hoang Van Luong,안종석,배기환 한국생약학회 2010 Natural Product Sciences Vol.16 No.2
We verified that the apoptosis activities were examined by DNA fragmentation, flow cytometric analysis with annexin V staining, activation of caspase-3, and cytochrome c release. In the result, a- and b-eudesmol induced DNA fragmentation in HL-60 cells at a concentration of 80 mM, respectively. Additionally, pro-apoptotic cells sorted by flow cytometry analysis were detected in HL-60 cells to 31.77 and 29.67% with a- and b-eudesmol of 80 mM. Thus, both a- and b-eudesmol exerted caspase-3 activation and cytochrome c release at 80 mM in HL-60 cells. These results are firstly reported that the sesquiterpenes, a- and b-eudesmol are apoptosis inducers through mitochondria-dependent caspase cascade in HL-60 cells.