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71.
Takahashi N. und F. Egami 《Colloid and polymer science》1962,183(1):86
Ohne Zusammenfassung 相似文献
72.
We demonstrate a new scheme to enhance the spatial resolution of a confocal optical microscope. Our scheme improves the spatial resolution in the direction of the optical axis. The confocal optical microscope, by use of a four-wave mixing geometry, can obtain optical information about weakly absorptive objects with organic dyes. Owing to the third-order nonlinear dependence of absorptive objects, the optical signal is confined to the focal region of the focusing incident beam. 相似文献
73.
T. Egami 《Journal of Physics and Chemistry of Solids》2008,69(9):2191-2194
Underdoped cuprates are characterized by nano-scale complexity with strong spatial variation in the electronic properties, including superconductivity. It is often assumed that the stripe order underlies this spatial complexity, but the evidence of local stripe order in the superconducting phase is weak. We propose an alternative idea of electronically driven two-dimensional local order that leads to phase separation in the reciprocal space, which could be the basis for two-component superconductivity. 相似文献
74.
In this paper we study the dividend optimization problem for a corporation or a financial institution when the management
faces (regulatory) implementation delays. We consider several cash reservoir models for the firm including two mean-reverting
processes, Ornstein–Uhlenbeck and square-root processes. Since the cash flow structure of different companies have different
qualitative behaviors, it makes sense to use different diffusions to model them. The delay causes significant difficulties
to the optimization problem since the cash reservoir fluctuates during the delay period. We provide a uniform mathematical
framework to analyze all the models and provide optimal threshold strategies at which the management initiates actions, i.e.,
declaration and payment of dividends. Our solution depends on a new characterization of the value function for one-dimensional
diffusions and provide easily implementable algorithms to find the optimal control and the value function. 相似文献
75.
Jeong IK Darling TW Lee JK Proffen T Heffner RH Park JS Hong KS Dmowski W Egami T 《Physical review letters》2005,94(14):147602
Using neutron pair distribution function analysis over the temperature range from 1000 to 15 K, we demonstrate the existence of local polarization and the formation of medium-range, polar nanoregions (PNRs) with local rhombohedral order in a prototypical relaxor ferroelectric Pb(Mg(1/3)Nb(2/3))O3. We estimate the volume fraction of the PNRs as a function of temperature and show that this fraction steadily increases from 0% to a maximum of approximately 30% as the temperature decreases from 650 to 15 K. Below T approximately 200 K the volume fraction of the PNRs becomes significant, and PNRs freeze into the spin-glass-like state. 相似文献
76.
Let (s, ) be the Hurwitz zeta function with parameter . Powermean values of the form are studied, where q and h are positive integers. These mean valuescan be written as linear combinations of , where r(s1,...,sr;) is a generalization of EulerZagiermultiple zeta sums. The MellinBarnes integral formulais used to prove an asymptotic expansion of , with respect to q. Hence a general way of deducingasymptotic expansion formulas for is obtained. In particular, the asymptotic expansion of with respect to q is written down. 相似文献
77.
A simple technique for fabrication of nonlinear gratings in polymer films, based on simultaneous embossing and poling, is proposed and demonstrated. A master grating consisting of a metal electrode with a dielectric die was fabricated and used for repeated embossing of the grating structures into nonlinear optical polymers at elevated temperatures. At the same time, we applied high voltage to the polymer films to induce second-order nonlinearity. The grating profile and the nonlinearity were estimated, as well as the mass productivity of nonlinear gratings. 相似文献
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