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21.
A. Tsuchida K. Taguchi E. Takyo H. Yoshimi S. Kiriyama T. Okubo M. Ishikawa 《Colloid and polymer science》2000,278(9):872-877
Rate coefficients (k) in the colloidal crystallization of monodispersed silica spheres in the presence of sodium chloride are studied in microgravity
achieved by parabolic flights of an aircraft. Time-resolved reflection spectroscopy is made with a continuous circulating-type
stopped-flow cell system. The k values decrease as the salt concentration increases both at 0 and 1 G and those in microgravity are smaller than those in
normal gravity by 16% (maximum), especially in water and in the presence of a small amount of the salt lower than 2 × 10−6 mol/l. The rates in flight at 1 G are larger by 15% (maximum) compared with those at 1 G on the ground. The k values obtained at 0 G, 1 G in flight and 1 G on the ground agree excellently with each other for the suspensions with 3 × 10−6 and 4 × 10−6 mol/l sodium chloride. Disappearance of the downward diffusion of spheres and no convection of the suspensions are important
for retardation in microgravity.
Received: 20 January 2000 Accepted: 9 March 2000 相似文献
22.
M. Kando S. Masuda A. Zhidkov A. Yamazaki H. Kotaki S. Kondo T. Homma S. Kanazawa K. Nakajima L. -M. Chen J. Ma Y. Hayashi M. Mori H. Kiriyama Y. Akahane N. Inoue H. Ueda Y. Nakai K. Tsuji Y. Yamamoto J. Koga T. Hosokai K. Kinoshita A. Maekawa M. Uesaka S. V. Bulanov T. Zh. Esirkepov M. Yamagiwa T. Kimura K. Yamakawa T. Tajima 《Laser Physics》2006,16(4):576-580
We present the results of electron generation experiments conducted at the Advanced Photon Research Center, Japan Atomic Energy Research Institute, using 23-fs relativistically intense 20-TW tightly focused laser pulses with underdense plasma. We observed electron energies up to 40 MeV characterized by a two-temperature Maxwell distribution. With the help of particle-in-cell simulations, we found that these are due to different plasma wave-breaking processes. A charge of 5 nC/shot was obtained at a small solid angle, which corresponds to high peak current generation. 相似文献
23.
24.
Y. Yamada A. Kaji M. Itoh N. Kiriyama K. Komura K. Ueno 《Journal of Radioanalytical and Nuclear Chemistry》1989,135(5):381-388
The daily variation of14C concentrations of liberated CO2 in the free fermentation process of Japanese SAKE brewing was studied. Each of the concentrations measured in the initial and final stages of the fermentation process correlated with levels of koji rice and steamed rice used for SAKE production, which had been obtained from different areas. This shows that analysis of fermenting CO2 of SAKE could be used to estimate the14C level in a local environment. 相似文献
25.
Y. Yamada K. Yasuike M. Itoh N. Kiriyama K. Komura K. Ueno 《Journal of Radioanalytical and Nuclear Chemistry》1995,201(5):381-390
A neutron activation method based on the measurement of tritium radioactivity produced by6Li (n,)3H reaction was applied to determine the isotopic abundance of6Li in aqueous solution with known lithium concentration. Tritium radioactivity was measured with a low background liquid scintillation counter over a period of 2000 min. The present method demonstrated a good linearity between the isotopic abundance of6Li and tritium radioactivity produced per unit amount of lithium in a wide range of lithium concentration. A comparison of the present data with those from mass spectrometry showed agreement, though our method was 10 times less sensitive, than mass spectrometry. The present new approach should thus prove quite useful for determining the isotopic abundance of6Li. 相似文献
26.
Tsuneo Okubo Akira Tsuchida Hideki Yoshimi Kazumori Taguchi Shigeharu Kiriyama 《Colloid and polymer science》2002,280(3):228-233
Rotational relaxation times (τ) of anisotropic tungstic acid colloids (3.24 μm in major axis) in aqueous suspension are measured in microgravity (0G), normal gravity (1G) and at 2G. The measurements at 0G and 2G are achieved by parabolic and circular flights, respectively. The limiting slopes of the relaxation curves in the plots of
the transmitted light intensity against time are close to zero at 0G irrespective of the flow directions in the flow cell, whereas those at 1G and especially at 2G depend on the flow direction by the convection of the suspension and particle sedimentation. Experimental errors at the τ
values at 0G are small compared with those at 1G and 2G, which is ascribed to the lack of movement of impurities in the suspension such as quite small air bubbles, which cannot
be recognized with the naked eye, and the convection of the suspension in microgravity. More reliable rotational relaxation
times are obtained in microgravity; however, the relaxation times themselves are quite insensitive to gravity. Theτ values observed are larger than those calculated from the particle size, which indicates the important contribution of the
electrical double layers formed around the colloidal particles.
Received: 22 February 2001 Accepted: 13 June 2001 相似文献
27.
Hiromitsu Kiriyama Shinichi Matsuoka Fumihiko Nakano Koichi Yamakawa 《Optical Review》2000,7(4):281-283
The ability of CsLiB6O10 (CLBO) crystals for high power second-harmonic generation (SHG) of a 1064-nm Nd:YAG laser in a quadrature arrangement was experimentally demonstrated. A 532-nm second harmonic output pulse energy of 2.25 J was obtained with 3.21 J of an input 1064-nm fundamental pulse energy at a repetition rate of 10 Hz, corresponding to a power conversion efficiency in excess of 70%. 相似文献
28.
Masayuki Suzuki Hiromitsu Kiriyama Yoshiki Nakai Hajime Okada Yoshio Kagebayashi Paul R. Bolton Shunichi Kawanishi 《Optics Communications》2010,283(3):451-453
We have demonstrated efficient frequency doubling of high-energy fundamental Nd:YAG laser pulse energy of the multi-joule (J) level at a high repetition rate using high optical-quality top-seeded solution growth CsB3O5(TSSG-CBO) crystal for the first time. Second-harmonic (532 nm) generation (SHG) output energy of 1.2 J at 10 Hz is obtained with a conversion efficiency of 60%. This result has been obtained at the multi-J level by the growth of high optical-quality TSSG-CBO crystal with the large effective nonlinear coefficient and high damage threshold. These results indicate that TSSG-CBO is a good candidate material for high-energy SHG of Nd-doped lasers at the several J level or more with high repetition rate. 相似文献
29.
Kenji Watanabe Shigeru Negi Dr. Yukio Sugiura Prof. Dr. Akiko Kiriyama Dr. Akino Honbo Katsumi Iga Prof. Dr. Eiichi N. Kodama Dr. Takeshi Naitoh Masao Matsuoka Prof. Dr. Koji Kano Prof. Dr. 《化学:亚洲杂志》2010,5(4):825-834
Interactions of multivalent anionic porphyrins and their iron(III) complexes with cationic peptides, V3Ba‐L and V3IIIB, which correspond to those of the V3 loop regions of the gp120 envelope proteins of the HIV‐1Ba‐L and HIV‐1IIIB strains, respectively, are studied by UV/Vis, circular dichroism, 1H NMR, and EPR spectroscopy, a microcalorimetric titration method, and anti‐HIV assays. Tetrakis(3,5‐dicarboxylatophenyl)porphyrin (P1), tetrakis[4‐(3,5‐dicarboxylatophenylmethoxy)phenyl]porphyrin (P2), and their ferric complexes (FeIIIP1 and FeIIIP2) were used as the multivalent anionic porphyrins. P1 and FeIIIP1 formed stable complexes with both V3 peptides (binding constant K>106 M ?1) through combined electrostatic and van der Waals interactions. Coordination of the His residues in V3Ba‐L to the iron center of FeIIIP1 also played an important role in the complex stabilization. As P2 and FeIIIP2 form self‐aggregates in aqueous solution even at low concentrations, detailed analysis of their interactions with the V3 peptides could not be performed. To ascertain whether the results obtained in the model system are applicable to a real biological system, anti‐HIV‐1BA‐L and HIV‐1IIIB activity of the porphyrins is examined by multiple nuclear activation of a galactosidase indicator (MAGI) and 3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide (MTT) assays. There is little correlation between chemical analysis and actual anti‐HIV activity, and the size rather than the number of the anionic groups of the porphyrin is important for anti‐HIV activity. All the porphyrins show high selectivity, low cytotoxicity, and high viral activity. FeIIIP1 and FeIIIP2 are used for the pharmacokinetic study. Half‐lives of these iron porphyrins in serum of male Wistar rats are around 4 to 6 h owing to strong interaction of these porphyrins with serum albumin. 相似文献
30.
Nuclear relaxation times T1 and T1p and T2 of two Tl isotopes, 203Tl and 205Tl, in solid TINO2 were measured betwe en 120 and 430 K. The shorter component of the highly non-exponential T1 decay shows two minima above and below room temperature, which were assigned to Tl+ ionic diffusion to NO-2 reorientation. 相似文献