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T.Y. Cho,J.H. Yoon,K.S. Kim,W. Fang,Y.K. Joo,K.O. Song,S.J. Youn,S.Y. Hwang,H.G. Chun 한국표면공학회 2007 한국표면공학회지 Vol.40 No.4
High Velocity Oxygen Fuel (HVOF) thermal spray coating of nano size WC-Co powder (nWC-Co) has been studied as one of the most promising candidate for the possible replacement of the traditional hard plating in some area which causes environmental and health problems. nWC-Co powder was coated on Inconel 718 substrates by HVOF technique. The optimal coating process obtained from the best surface properties such as hardness and porosity is the process of oxygen flow rate (FR) 38 FMR, hydrogen FR 57 FMR and feed rate 35 g/min at spray distance 6 inch for both surface temperature 25℃ and 500℃. In coating process a small portion of hard WC decomposes to less hard W₂C, Wand C at the temperature higher than its decomposition temperature 1,250°C resulting in hardness decrease and porosity increase. Friction coefficient increases with increasing coating surface temperature from 0.55-0.64 at 25℃ to 0.65-0.76 at 500℃ due to the increase of adhesion between coating and counter sliding surface. Hardness of nWC-Co is higher or comparable to those of other hard coatings, such as A1₂O₃, Cr, Cr₂O₃ and HVOF Tribaloy 400 (T400). This shows that nWC-Co is recommendable for durability improvement coating on machine components such as high speed spindle.
China Spallation Neutron Source: Accelerator Design Iterations and R&D Status
J. Wei,C.-D. Deng,C.-H. Wang,C.-T. Shi,H. Sun,H.-F. Ouyang,H.-M. Qu,H.-Y. Dong,J. Li,J. Zhang,J.-S. Cao,J.-Y. Tang,L. Dong,L.-L. Wang,Q. Qin,Q.-B. Wang,S. Wang,S.-N. Fu,S.-X Fang,T. -G. Xu,W. Kang,Y.- 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
The China Spallation Neutron Source (CSNS) is a high-power, accelerator-based project currently under preparation. The accelerator complex consists of an H$^-$ ion source, an H$^-$ linac, a rapid-cycling proton synchrotron, and the transport lines. During the past year, the design of most accelerator systems went through major iterations, and initial research and developments was started on the prototyping of several key components.
MOLECULAR DYNAMICS OF NANOINDENTATION WITH CONICAL CARBON INDENTERS ON GRAPHITE AND DIAMOND
T. H. FANG,Y. C. FAN,W. J. CHANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2010 NANO Vol.5 No.4
Molecular dynamics (MD) simulation of nanoindentation with a conical carbon indenter on graphite sheets and diamond is performed. The interactions of carbon indenter, graphite, and diamond atoms are described by the Tersoff–Brenner potential. Also, the Lennard–Jones potential function is employed to simulate the interactions between the indenter and the graphite and diamond atoms. The simulation results show that the maximum contact force increases with increasing conical angle due to an increase in the contact area. As the indentation velocity increases, the maximum contact force increases. However, the force decreases when the substrate temperature increases because of the weak interaction force between the atoms. Furthermore, the maximum contact force of nanoindentation with a conical indenter on the diamond was larger than that on the graphite sheets at the same indentation depth, velocity, and temperature.
Jeon, H.J.,Fang, T.,Lee, J.-G.,Jang, J.Y.,Kim, K.,Choi, S.,Yan, J.-J.,Ryu, J.H.,Koo, T.Y.,Ahn, C.,Yang, J. Elsevier 2018 Transplantation proceedings Vol.50 No.4
<P><B>Abstract</B></P> <P><B>Introduction</B></P> <P>B cell subtypes and immunoglobulin variable (V), diversity (D), joining (J) gene segment usage of B cell receptors in ABO-incompatible (ABOi) kidney transplantation (KT) in comparison to ABO-compatible KT have not been studied. The aims of this study were to analyze the VDJ gene segment usages of B cell receptors in peripheral blood of ABOi KT recipients.</P> <P><B>Methods</B></P> <P>Eighteen ABOi KT patients with accommodation (ABOiA), 10 ABO-compatible stable KT patients (ABOcS), and 10 ABOi KT patients with biopsy-proven acute antibody-mediated rejection (ABOiR) at day 10 after transplantation were selected. Complete transcriptomes of their peripheral blood samples were sequenced and analyzed through RNA sequencing.</P> <P><B>Results</B></P> <P>By family, immunoglobulin heavy chain variable 3 (IGHV3), immunoglobulin light kappa chain variable 1 (IGKV1), immunoglobulin light lambda chain variable 2 (IGLV2), and immunoglobulin light lambda chain joining 3 (IGLJ3) gene segments were most frequently used in all groups, and their usage was not statistically different among the three groups except for IGHV3 and IGKV1. IGKV1 was more frequently used in the ABOiA group than in the ABOcS group. According to individual gene segments, IGHV3-7, IGHV3-15, IGHV4-59, IGKV3-11, IGLV1-44, IGLV2-14, IGLV4-69, and IGLV7-46 were more frequently used in the ABOcS group than other groups, and IGKV3-7 was more frequently used in the ABOiR group than other groups. IGLV5-52 and IGLV7-43 were more frequently used in the ABOiA group than in ABOcS group.</P> <P><B>Conclusions</B></P> <P>Our findings suggest that RNA sequencing transcriptomic analyses of peripheral blood can provide information on the VDJ gene usage of B cell receptors and the mechanisms of accommodation and immune reaction in ABOi KT.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Variable (V), diversity (D), and joining (J) gene usage of B cell receptors in kidney transplantation was analyzed by RNA sequencing. </LI> <LI> Several VDJ gene usages were different between ABO incompatible and compatible kidney transplants. </LI> <LI> VDJ gene usage was affected by accommodation or antibody-mediated rejection status. </LI> </UL> </P>
Static measurement of yield stress using a cylindrical penetrometer
Uhlherr, P.H.T.,Guo, J.,Fang, T.N.,Tiu, C. The Korean Society of Rheology 2002 Korea-Australia rheology journal Vol.14 No.1
A novel and simple method using a cylindrical penetrometer is being developed for the measurement of yield stress. The principle of this technique is based on the measurement of the static equilibrium of a falling penetrometer in a yield stress fluid. The yield stress is simply determined by a balance of forces acting on the penetrometer. The yield stress of Carbopol gels and $TiO_2$ suspensions has been measured using this method. The results are in reasonable agreement with the values from conventional methods. The effects of the dimensions and weight of the penetrometer have been examined. The long-term behaviour was also observed. No measurable creep was seen and equilibrium was found to be very quickly established. The cylindrical penetrometer technique promises to be a simple, quick and reliable static method for the measurement of yield stress.
Betulinic acid inhibits high-fat diet-induced obesity and improves energy balance by activating AMPK
Kim, K.-D.,Jung, H.-Y.,Ryu, H.G.,Kim, B.,Jeon, J.,Yoo, H.Y.,Park, C.H.,Choi, B.-H.,Hyun, C.-K.,Kim, K.-T.,Fang, S.,Yang, S.H.,Kim, J.-B. Elsevier 2019 Nutrition, metabolism, and cardiovascular diseases Vol.29 No.4
<P><B>Abstract</B></P> <P><B>Background and aim</B></P> <P>Metabolic syndromes are prevalent worldwide and result in various complications including obesity, cardiovascular disease and type II diabetes. Betulinic acid (BA) is a naturally occurring triterpenoid that has anti-inflammatory properties. We hypothesized that treatment with BA may result in decreased body weight gain, adiposity and hepatic steatosis in a diet-induced mouse model of obesity.</P> <P><B>Methods and results</B></P> <P>Mice fed a high-fat diet and treated with BA showed less weight gain and tissue adiposity without any change in calorie intake. Gene expression profiling of mouse tissues and cell lines revealed that BA treatment increased expression of lipid oxidative genes and decreased that of lipogenesis-related genes. This modulation was mediated by increased AMP-activated protein kinase (AMPK) phosphorylation, which facilitates energy expenditure, lipid oxidation and thermogenic capacity and exerts protective effects against obesity and nonalcoholic fatty liver disease. Overall, BA markedly inhibited the development of obesity and nonalcoholic fatty liver disease in mice fed a high-fat diet, and AMPK activation in various tissues and enhanced thermogenesis are two possible mechanisms underlying the antiobesity and antisteatogenic effects of BA.</P> <P><B>Conclusions</B></P> <P>The current findings suggest that treatment with BA is a potential dietary strategy for preventing obesity and nonalcoholic fatty liver disease.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Betulinic acid (BA) decreased body weight gain, adiposity and hepatic steatosis in a diet-induced obese mouse model. </LI> <LI> BA treatment increased expression of lipid oxidative genes and decreased mRNA expression related to lipogenesis. </LI> <LI> BA treatment enhanced activation of AMPK, which facilitates energy expenditure, lipid oxidation and thermogenesis. </LI> <LI> BA intake may be a potential dietary strategy for preventing obesity and nonalcoholic fatty liver disease. </LI> </UL> </P>