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Lubricating performance of vegetable oils as environmentally friendly fluids
K. MIMURA,S. MITSUMUNE,I. MINAMI 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Although vegetable oils provide good lubricity, they still need optimization by certain additive technology for practical applications. ZDTP improve antiwear properties of vegetable oils. However the additive performance depends on quality of the base oil. Antioxidants were applied to prevent the auto-oxidation of vegetable oils. Good synergistic effect of anti-wear and anti-oxidant additives was confirmed.
Impurity Behavior in Cu Refined by Ar Plasma-Arc Zone Melting
G. M. Lalev,임재원,N. R. Munirathnam,G.-S. Choi,M. Uchikoshi,K. Mimura,M. Isshiki 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.5
Purification of a 4N grade Cu rod by argon plasma-arc zone melting (APZM) was carried out. Detailed impurity analysis of the Cu rod was performed using glow discharge mass spectrometry (GDMS). Three impurity behavior groups based on segregation and evaporation during APZM were discussed using the GDMS analysis. Although the impurities with segregation coefficient ko < 1 were theoretically expected to be segregated towards the end of the Cu rod, it was found that the segregation effect by APZM can occur when the equilibrium distribution coefficient (ko) is less than 0.4 due to the strong affinity of Cu for some metallic and non-metallic impurities. On the other hand, the impurities for which ko > 1 had no significant reduction in their impurity concentrations. Some impurities, like Mg, S, Cd and Zn, were reduced much faster than the others in Cu. This was ascribed to the removal by zone refining coupled with the evaporation of impurities for Pimp/PCu > 102. Purification of a 4N grade Cu rod by argon plasma-arc zone melting (APZM) was carried out. Detailed impurity analysis of the Cu rod was performed using glow discharge mass spectrometry (GDMS). Three impurity behavior groups based on segregation and evaporation during APZM were discussed using the GDMS analysis. Although the impurities with segregation coefficient ko < 1 were theoretically expected to be segregated towards the end of the Cu rod, it was found that the segregation effect by APZM can occur when the equilibrium distribution coefficient (ko) is less than 0.4 due to the strong affinity of Cu for some metallic and non-metallic impurities. On the other hand, the impurities for which ko > 1 had no significant reduction in their impurity concentrations. Some impurities, like Mg, S, Cd and Zn, were reduced much faster than the others in Cu. This was ascribed to the removal by zone refining coupled with the evaporation of impurities for Pimp/PCu > 102.
Miyake, N.,Tsukaguchi, H.,Koshimizu, E.,Shono, A.,Matsunaga, S.,Shiina, M.,Mimura, Y.,Imamura, S.,Hirose, T.,Okudela, K.,Nozu, K.,Akioka, Y.,Hattori, M.,Yoshikawa, N.,Kitamura, A.,Cheong, H.,Kagami, S University of Chicago Press [etc.] 2015 American journal of human genetics Vol.97 No.4
The nuclear pore complex (NPC) is a huge protein complex embedded in the nuclear envelope. It has central functions in nucleocytoplasmic transport, nuclear framework, and gene regulation. Nucleoporin 107 kDa (NUP107) is a component of the NPC central scaffold and is an essential protein in all eukaryotic cells. Here, we report on biallelic NUP107 mutations in nine affected individuals who are from five unrelated families and show early-onset steroid-resistant nephrotic syndrome (SRNS). These individuals have pathologically focal segmental glomerulosclerosis, a condition that leads to end-stage renal disease with high frequency. NUP107 is ubiquitously expressed, including in glomerular podocytes. Three of four NUP107 mutations detected in the affected individuals hamper NUP107 binding to NUP133 (nucleoporin 133 kDa) and NUP107 incorporation into NPCs in vitro. Zebrafish with nup107 knockdown generated by morpholino oligonucleotides displayed hypoplastic glomerulus structures and abnormal podocyte foot processes, thereby mimicking the pathological changes seen in the kidneys of the SRNS individuals with NUP107 mutations. Considering the unique properties of the podocyte (highly differentiated foot-process architecture and slit membrane and the inability to regenerate), we propose a ''podocyte-injury model'' as the pathomechanism for SRNS due to biallelic NUP107 mutations.
Visible luminescence of nanocrystalline AlN:Er thin film by co-deposition of AlN, Er, and SiO2
J.-W. Lim,W. Takayama,Y.F. Zhu,J.W. Bae,J.F. Wang,S.Y. Ji,K. Mimura,J.H. Yoo,M. Isshiki 한국물리학회 2007 Current Applied Physics Vol.7 No.3
We report a visible luminescence of Er3+ ions in an amorphous-nanocrystalline AlN:Er thin lm prepared by co-deposition usingAlN, Er, and SiO2 3+ in the AlN:Er lm annealed at 750.C showed a strong bluish green emissionof Er3+ in the amorphous-nanocrystalline AlN:Er thin lm, which is attributed to the intra-4fEr3+ transitions of2H11/2!4I15/2 and4F7/2!4I15/2The occurrence of the strong Er3+ emission in the annealed AlN:Er thin lm with a mixture of amorphous and nanocrystalline phasesmay be contributed to an increase in the number of excitation Er3+ centers and a presence of oxygen related to Er3+ excitation andrecombination process in the AlN:Er thin film.
Lalev, G. M.,Lim, J.-W.,Munirathnam, N. R.,Choi, G.-S.,Uchikoshi, M.,Mimura, K.,Isshiki, M. The Japan Institute of Metals 2009 MATERIALS TRANSACTIONS Vol.50 No.3
<P>Removal of non-metallic impurities like O, N, C and S in 4N Cu rods by argon plasma-arc zone melting and hydrogen plasma-arc zone melting was investigated. The experimental results were discussed on the basis of thermodynamic estimation. Substantial removal of these impurities along the length of the Cu rods by argon plasma-arc zone melting was observed and relatively better removal by hydrogen plasma-arc zone melting was found to be due to activated hydrogen atoms. The removal of O, N, C and S was ascribed to the segregation effect as well as evaporation in the form of CH<SUB>4</SUB>, H<SUB>2</SUB>O and H<SUB>2</SUB>S. As a result, it was found that hydrogen plasma-arc zone melting is a better technique to eliminate non-metallic impurities like O, N, C and S in Cu.</P>