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排序方式: 共有94条查询结果,搜索用时 31 毫秒
51.
Gyung-Min Choi Mamoru Tanahashi Toshio Miyauchi 《Proceedings of the Combustion Institute》2005,30(2):1807-1814
To control combustion oscillations, the characteristics of an oscillating swirl injection premixed flame have been investigated, and control of oscillating combustion and noise based on local flame structure has been conducted. The r.m.s. value of pressure fluctuations and noise level show significantly large values between = 0.8 and 1.1. The beating of pressure fluctuations is observed for the large oscillating flame conditions in this combustor. Relationship between beating of pressure fluctuations and local flame structure was observed by the simultaneous measurement of CH/OH planar laser induced fluorescence and pressure fluctuations. The local flame structure and beating of pressure fluctuations are related and the most complicated flame is formed in the middle pressure fluctuating region of beating. The beating of pressure fluctuations, which plays important roles in noise generation and nitric oxide emission in this combustor, could be controlled by injecting secondary fuel into the recirculating region of oscillating flames. Injecting secondary fuel prevented lean blowout, and low NOx combustion was also achieved even for the case of pure methane injection as a secondary fuel. By injecting secondary fuel into the recirculating region near the swirl injector, the flame lifted from the swirl injector and its reaction region became uniform and widespread, hence resulting in low nitric oxide emission. Secondary mixture injection, fuel diluted with air, is not effective for control of combustion oscillations suppression and lean blowout prevention. 相似文献
52.
53.
Tsurugi H Saito T Tanahashi H Arnold J Mashima K 《Journal of the American Chemical Society》2011,133(46):18673-18683
High-valent tantalum complexes having redox-active α-diimine ligands, (α-diimine)TaCl(n) (n = 3, 4), are prepared by the reaction of TaCl(5), α-diimine ligands, and an organosilicon-based reductant, 1-methyl-3,6-bis(trimethylsilyl)-1,4-cyclohexadiene. Reductive cleavage of the C-Cl bond of polyhaloalkanes is accomplished by trichlorotantalum complexes having dianionic α-diimine ligands via electron transfer from the dianionic ligands, whereas oxidative decomposition of tetraphenylborate is observed using tetrachlorotantalum complexes with monoanionic α-diimine ligands through electron transfer to the monoanionic ligands. Chemically oxidized or reduced complexes of (α-diimine)TaCl(4) are isolated as ligand-centered redox products, [Cp(2)Co][(α-diimine)TaCl(4)] and [(α-diimine)TaCl(4)][WCl(6)], where the α-diimine ligand coordinates to the metal center as a dianionic or neutral ligand, respectively. On the basis of EPR measurements of (α-diimine)TaCl(4) complexes (which are key intermediates for reductive cleavage of C-Cl bond and oxidative decomposition of tetraphenylborate), two redox isomers--a tantalum-centered radical and ligand-localized radical--are present in solution. 相似文献
54.
55.
The internal friction Q?1 and the oscillation frequency f of Zr–Ti–Cu–Ni–Be metallic glass specimens were measured using an inverted torsion pendulum with the free decay method. A single-roller melt-spinning apparatus was used for preparing the specimens. Isothermal annealing near the glass transition temperature Tg was performed to investigate the stabilization of the specimens. Q?1 decreased with annealing time t due to the stabilization. Q?1-vs-t was measured at various annealing temperatures Ta, and the values of relaxation time τ for the stabilization process were determined. The dependence of τ on Ta showed that the hydrodynamic behavior represented by the Vogel–Tammann–Fulcher form and the hopping behavior represented by the Arrhenius form were observed in high- and low-temperature regions, respectively. The crossover of the two behaviors was seen at a temperature near and somewhat higher than Tg. The result was discussed on the basis of the viscoelastic relaxation in glassy materials. 相似文献
56.
On log-hyponormal operators 总被引:9,自引:0,他引:9
Kôtarô Tanahashi 《Integral Equations and Operator Theory》1999,34(3):364-372
LetTB(H) be a bounded linear operator on a complex Hilbert spaceH.TB(H) is called a log-hyponormal operator itT is invertible and log (TT
*)log (T
*
T). Since log: (0, )(–,) is operator monotone, for 0<p1, every invertiblep-hyponormal operatorT, i.e., (TT
*)
p
(T
*
T)
p
, is log-hyponormal. LetT be a log-hyponormal operator with a polar decompositionT=U|T|. In this paper, we show that the Aluthge transform
is
. Moreover, ifmeas ((T))=0, thenT is normal. Also, we make a log-hyponormal operator which is notp-hyponormal for any 0<p.This research was supported by Grant-in-Aid Research No. 10640185 相似文献
57.
Phytochemical study of the stems of Jasminum nudiflorum has led to the isolation of five new secoiridoid glucosides, jasnudiflosides D (1) and E (2) and nudiflosides A-C (3-5). The structures of these compounds were elucidated on the basis of chemical and spectroscopic evidence. 相似文献
58.
59.
Toi K Kawahata K Morita S Watari T Kumazawa R Ida K Ando A Oka Y Sakamoto M Hamada Y Adati K Ando R Aoki T Hidekuma S Hirokura S Kaneko O Karita A Kawamoto T Kawasumi Y Kuroda T Masai K Narihara K Ogawa Y Ohkubo K Okajima S Ozaki T Sasao M Sato KN Seki T Shimpo F Takahashi H Tanahashi S Taniguchi Y Tsuzuki T 《Physical review letters》1990,64(16):1895-1898
60.