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MAGNETO - OPTICAL KERR SPECTRA FOR AMORPHOUS RE - Co ALLOY FILMS
최영준(Y. J. Choe),S. Tsunashima(S. Tsunashima),S. Uchiyama(S. Uchiyama) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.2
The magneto-optical Kerr spectra(λ=250~700㎚) of amorphous RE-Co(RE=Ce, Nd, Pr, Gd, Tb, Er, Ho) are compared with those of Y-Co films. It has been found that the Kerr rotation of RE-Co is mainly due to Co in the long wavelength region, whereas at short wavelength Ce, Pr, Nd, and Gd contribute positively, and Tb, Ho, and Er contribute negatively to the Kerr rotation of RE-Co amorphous films. In the interesting energy region(1.5~5.0 eV), the magneto-optical contribution of Pr and Nd are thought to be related with 4f↑ - 5d↑ inter band transition, and the contribution of Ce and Gd might be concerned with d→ p interband transition. The magneto-optical effect of Tb in the short wavelength region might be related with 4f↓- 5d↓ and/or 5d↓ - 4f↓, and that of Ho and Er can be explained by 4f↓ - 5d↓ magneto-optical interband transition.
The Rolling-Sliding Friction of Rubber and the Behavior of Contact Area
Y. UCHIYAMA,N. MONDEN,T. MIYAO,T. IWAI 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Rolling-sliding friction was investigated for three SBR (styrene-butadiene rubber) specimens including silica-tilled. HAF carbon black-tilled, and SAF carbon black-tilled SBR. When a rubber wheel was rolled against a glass disk, the coefficient of friction varied with the slip ratios. The coefficient of friction for the silica-tilled SBR showed the highest value of the rubber specimens examined under various slip ratios. The contact areas of silica-filled SBR were larger than those of the carbon black-filled SBRs, as indicated the modulus of the silica-tilled SBR showing the lowest value. The contact area during rolling-sliding friction was always smaller than those during the static contact. The friction force at the unit contact area for the silica-filled SBR under braking and driving was higher than those of carbon black-filled SBRs.
Exciton diffusion in near-infrared absorbing solution-processed organic thin films
Shin, H.-Y.,Woo, J. H.,Gwon, M. J.,Barthelemy, M.,Vomir, M.,Muto, T.,Takaishi, K.,Uchiyama, M.,Hashizume, D.,Aoyama, T.,Kim, D.-W.,Yoon, S.,Bigot, J.-Y.,Wu, J. W.,Ribierre, J. C. The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.8
<P>We report on singlet–singlet annihilation and exciton diffusion in as-prepared p-type and annealed n-type thin films of the low-bandgap quinoidal quaterthiophene [QQT(CN)4] using ultrafast transient absorption measurements. The decay dynamics of exciton populations are well described by a one-dimensional diffusion-limited bimolecular recombination, indicating that the singlet excitons migrate preferentially along the stacking direction. Our results show that the exciton diffusion constants in QQT(CN)4 films do not vary significantly upon thermal annealing. Exciton diffusion lengths are measured to be as high as 4 and 5 nm in as-prepared and annealed QQT(CN)4 films, respectively. We also observe an influence of the excitation densities on the singlet exciton diffusion, which is attributed to phonon scattering. Because of the possibility of patterning p–n regions in QQT(CN)4 films by thermal nanolithography techniques, this study provides important insight not only into the photophysical properties of quinoidal oligothiophene derivatives but also for their future integration into high-performance p–n nanostructured near infrared light-sensing devices.</P> <P>Graphic Abstract</P><P>Exciton–exciton annihilation and exciton diffusion processes are investigated by femtosecond transient absorption in as-prepared p-type and annealed n-type thin films of the quinoidal quaterthiophene [QQT(CN)4]. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp43705h'> </P>
Naoyuki Moriya,Yukiko Moriya,Hideo Nomura,Kisato Kusano,Yukoh Asada,Hirofumi Uchiyama,Enoch Y. Park,Mitsuyasu Okabe 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.6
β-(1→3)-D-glucans with β-(1→6)-glycosidiclinked branches are known to be immune activation agentsand are incorporated in anti-cancer drugs and healthpromotingsupplements. β-Glucan concentration was 9.2 g/Lin a 200-L pilot scale fermentor using mutant strainAureobasidium pullulans M-2 from an imperfect fungalstrain belonging to A. pullulans M-1. The culture broth ofA. pullulans M-2 had a faint yellow color, whereas that ofthe wild-type had an intense dark green color caused by theaccumulation of melanin-like pigments. β-Glucan producedby A. pullulans M-2 was identified as a polysaccharide ofD-glucose monomers linked by β-(1→3, 1→6)-glycosidicbonds through GC/MS and NMR analysis. When aconventional medium was used in the culture of A. pullulansM-2 in a 3-L jar fermentor, β-glucan concentration was1.4-fold that produced by the wild-type. However, when amedium optimized by statistical experimental design wasused with dissolved oxygen at 10%, the β-glucan concentrationwas 9.9 g/L with a yield of 0.52 (g β-glucan/g consumedsucrose), 2.9-fold that of the wild-type. This level ofproductivity was reproduced when the fermentation wasscaled up 200-L. The industrial production of high β-glucan without melanin-like pigments is highly expected,as a health-promoting supplement or functional food.