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51.
We numerically investigate the propagation of light through the photonic crystal (PhC) waveguide on low refraction index material for near-field light focusing at the visible wavelength (635 nm) by incorporating a center air slot and Fabry-Perot resonator on the scanning tip. Perturbations by water and substrate refraction index changes of the PhC are analyzed by the finite-difference time-domain method to show minimal impact on light confinement and throughput. Such a total dielectric probe tip design has great potential to complement the current widely used metal-coated optical-fiber-based light confinement probe. 相似文献
52.
Spectrophotometric determination of titanium(IV) was accomplished with o-carboxyphenylfluorone (OCPF) in the presence of hexadecyltrimethyl ammonium chloride (HTAC) under strongly acidic media. In the determination of titanium(IV), Beer's law was obeyed in the range of 24-340 ng mL−1 with an effective molar absorption coefficient (at 530 nm) and relative standard deviation of 2.24 × 105 dm3 mol−1 cm−1 and 0.64% (n = 8), respectively. The severe interference of iron ions was easily eliminated by the addition of ethylenediaminetetraacetic acid (EDTA); the effects of other foreign substances were low. Equilibrium and kinetic studies under analytical conditions were investigated to quantitatively evaluate the reaction mechanism. The obtained orange complex is considered to be Ti(OCPF)4. Its stability log Kf and rate constant Kobs are 16.88 and 1.65 × 10−2 s−1, respectively. It is suggested that the color of the complex is related to the species of OCPF in the solution. 相似文献
53.
Sato T Yoshida S Hoshino H Tanno M Nakajima M Hoshino T 《Journal of the American Chemical Society》2011,133(25):9734-9737
In this study, mono- and pentacyclic C(35) terpenes from Bacillus subtilis were biosynthesized via the cyclization of C(35) isoprenoid using purified enzymes, including the first identified new terpene cyclase that shows no sequence homology to any of the known terpene cyclases. On the basis of these findings, we propose that these C(35) terpenes should be called the new family of "sesquarterpenes." 相似文献
54.
A laminar boundary-layer heat transfer in a jacketed, stirred tank with non-Newtonian fluids has been experimentally and
theoretically examined. Heat transfer rates from jacket to process liquid through the stirred tank wall were measured for
different large-scale impeller designs and rheological properties. On the basis of the laminar boundary-layer theory, we developed
a theoretical correlation for non-Newtonian laminar tank-side film heat transfer coefficients in stirred tanks. The correlation
was derived using von Karman's integral technique. Satisfactory agreement between the predictions of the proposed correlation
and the present experimental data for viscous Newtonian and non-Newtonian laminar heat transfer in stirred tanks was obtained.
Received on 20 February 2001 / Published online: 29 November 2001 相似文献
55.
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57.
The cation distribution in the superionic conductor α-AgI has been re-examined using neutron as well as X-ray diffraction data. A least squares analysis shows that the experimental data are very well explained by a structure model in which two silver ions are distributed over 12(d) sites of the space group Im3m with large asymmetric anharmonic thermal vibrations. 相似文献
58.
Ohne Zusammenfassung 相似文献
59.
Nobuhiro Kodama Kiyoaki Tanaka Taizo Utsunomiya Yoshio Hoshino Fumiyuki Marumo Nobuo Ishizawa Masanori Kato 《Solid State Ionics》1984,14(1):17-24
Integrated intensities of X-ray reflections from a barium chloride fluoride single crystal were measured at 24, 180, 289, 402, 467 and 610°C. The intensities were used for the determination of the anharmonic potential parameters up to the third order. Harmonic potential parameters for each ion were obtained from the temperature dependence of thermal parameters, and anharmonic potential parameters were determined by the least-squares procedures, utilizing the temperature factor formalism based on the cumulant expansion. As a result, it has been found that the Ba2+ and Cl? ions show an anharmonicity, while no significant anharmonic effect was detected for the F? ion. From the potential calculated around the Cl? and F? ions, it was found that both Cl? and F? ions diffuse more easily within the (001) plane than along the c axis. 相似文献
60.
The diffusion of 59Fe and 60Co has been measured in pure CoO and dilute iron-doped CoO, (Co1?cFecO, as a function of temperature (1000–1400°C) and oxygen partial pressure Po2), (10?7 ≦ Po2 ≦ 0 21 atm) The enhancement factors for the diffusivities of iron and cobalt are nearly identical, which suggests that the primary cause of the enhancement is the increased concentration of charge-compensating cation vacancies with the addition of iron. The Fe ions dissolved in CoO appear to exist as a mixture of Fe2+ and Fe3+ ions, the fraction of iron ions in the three-plus state decreases with decreasing Po2 The simultaneous diffusion of 52Fe and 59Fe has been measured as a function of (itpo; at 1200°C The correlation factor for Fe impurity diffusion determined from the isotope-effect measurements is about the same as that for self-diffusion in CoO at high (itPo2 (2 × 10?3 ≦ po2 ≦ 0 21 atm), but increases slightly with decreasing pO2 Both the enhancement-effect and isotope-effect experiments suggest that the nearestneighbor interactions between Fe ions and vacancies is small, and that the dissolved Fe ions do not have strongly bound electron holes. 相似文献