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Friction and Pull-off Forces on Submicron-Size Asperity Measured in High Vacuum
Y. Ando 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Asperity arrays and Independent asperities were fabricated on a silicon, plate. Then pull-off and friction forces were measured on each asperity pattern by using AFM (atomic force microscope) in humid air and high vacuum of 2 × 10?? ㎩. The probe of AFM cantilever has a flat square of about 1 ㎛² on its tip. The results showed that the pull-off force was proportional to the curvature radius of asperity peak in each ambient condition. The, friction force 'was proportional to the pull-off force and was slightly higher in the humid air than in the high vacuum.
Ando, S.,Nishiguchi, Y.,Hayasaka, K.,Yoshihara, Y.,Takahashi, J.,Iefuji, H. Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.3
The in vitro degradability of yeast and the effect of yeast on the in vitro degradability of forage may differ in terms of the specific yeast strains or their incubation conditions. Thus in experiment 1, two strains of sake yeast (strainK7 and strainK9) and one strain of bakers' yeast (KY5649) were incubated in an aerobic condition. In experiment 2, aerobically or anaero bically incubated K7 was used for investigating the in vitro degradability of yeast, the effect of yeast on the in vitro degradability of forage, and the degradability of yeast by pepsin and pronase treatment. The in vitrodegradability of bakers' yeast was significantly (p<0.05) higher than those of sake yeasts. The in vitro degradability of anaerobically incubated yeast was significantly (p<0.01) higher than that of aerobically incubated yeast. The degradability of bakers' yeast by pepsin treatment was significantly (p<0.01) higher than that of the sake yeasts. The degradability of bakers' yeast by pronase treatment was slightly higher than that of the two sake yeasts, while the degradability of anaerobically incubated yeast by both enzymes, respectively, was significantly (p<0.01) higher than that of aerobically incubated yeast. The degradability of forages was increased significantly (p<0.05) by the addition of yeasts. The degradability of roughage by sake yeast tended to be higher than that by the bakers' yeast. The degradability of roughage was significantly (p<0.05) higher by anaerobically incubated yeast than by aerobically incubated yeast. Given the above results, it seems that in vitro degradability of yeast and the magnitude of the increment of roughage degradation differ among the yeast strains and their incubation conditions.
Ando, S.,Khan, R.I.,Takahasi, J.,Gamo, Y.,Morikawa, R.,Nishiguchi, Y.,Hayasaka, K. Asian Australasian Association of Animal Productio 2004 Animal Bioscience Vol.17 No.1
The effects of the addition of yeast on in vitro roughage degradability and methane production were investigated in order to clarify the effects of yeast on the rumen microbes and to establish methods of rumen manipulation. Three roughages (whole crop corn, rice straw and Italian ryegrass) were incubated for 3, 6, 12 and 24 h with or without dried beer yeast following the method described by Tilley and Terry. Using the same method, these roughages were incubated with or without yeast extract, albumin or purified DNA. In vitro methane production was measured with or without dried beer yeast at 12 and 24 h. The degradability of yeast was found to be 57 and 80% at 12 and 24 h, respectively. The rate of degradation of fraction b was 6.16%/h. There was a significant increase in roughage degradability at 6 h (p<0.05), 12 h (p<0.05) and 24 h (p<0.01) by dried yeast addition. The degradability of all three roughages was higher in the samples treated with yeast extract than in the no addition samples except in the case of rice straw incubated for 12 h. Nevertheless, the magnitude of increment was smaller with the addition of yeast extract than without the addition of yeast. With the addition of purified DNA, there were significant increases in roughage degradability at 6 h (p<0.01), 12 h (p<0.01) and 24 h (p<0.05); however, higher degradability values were detected in the samples to which albumin was added, particularly at 6 h. If the degradability values of the no addition samples with those of samples containing yeast, yeast extract, DNA and albumin were compared, the largest difference was found in the samples to which yeast was added, although it is worth noting that higher values were observed in the yeast extract samples than in the DNA or albumin samples, with the exception of the case of rice straw incubated for 24 h. Methane production was significantly increased at both 12 and 24 h incubation. The increment of roughage degradation and methane production brought about by the addition of dried beer yeast to the samples was thought to be due to the activation of rumen microbes. Water soluble fraction of yeast also seemed to play a role in ruminal microbe activation. The increment of degradability is thought to be partially due to the addition of crude protein or nucleic acid but it is expected that other factors play a greater role. And those factors may responsible for the different effects of individual yeast on ruminal microbes.
New Defect Control for Extremely Long-Lived Widegap-White Light Emitting Diodes
K. Ando,Y. Hashimoto,K. Kanzaki,S. Ohashi,Y. Morita,T. Abe,H. Kasada,M. Adachi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
A new current pulse-width control for long-lived ZnSe-white LEDs is presented. Using the defect controlling technique together with high quality ZnSe white LED, it is proved that bright ZnSe white LEDs have exhibited long device life-time exceeding 20000 hrs for its in practical use. It is also evidenced that the present current pulse-width control is not limited in the ZnSe system, but very effective for other widegap semiconductor bright and long-live light emitting devices of GaN and ZnO.
Vibration isolation system with a compact damping system for power recycling mirrors of KAGRA
Akiyama, Y,Akutsu, T,Ando, M,Arai, K,Arai, Y,Araki, S,Araya, A,Aritomi, N,Asada, H,Aso, Y,Bae, S,Baiotti, L,Barton, M A,Cannon, K,Capocasa, E,Chen, C-S,Chiu, T-W,Cho, K,Chu, Y-K,Craig, K,Dattilo, V,Do Institute of Physics 2019 Classical and quantum gravity Vol.36 No.9
<P>A vibration isolation system called the Type-Bp system used for power recycling mirrors has been developed for KAGRA, the interferometric gravitational-wave observatory in Japan. A suspension of the Type-Bp system passively isolates an optic from seismic vibration using three main pendulum stages equipped with two vertical vibration isolation systems. A compact reaction mass around each of the main stages allows for achieving sufficient damping performance with a simple feedback as well as vibration isolation ratio. Three Type-Bp systems were installed in KAGRA, and were proved to satisfy the requirements on the damping performance, and also on estimated residual displacement of the optics.</P>