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[en] The laser light spectroscopy is introduced to study the surface hydrodynamics of complex fluids. One of the techniques is the quasi elastic surface light scattering (QESLS), which measurements the fluctuation of surface waves generated by the thermal motion of molecules at an interface. The thermal motion of the surface is dictated by mainly the surface tension, and hydrodynamic variables of the surface as well as a bulk solution. QESLS is the technique to measure the power spectrum of scattering light due to the fluctuation of the waves, and determine the dispersion relationship. The other technique used is the Electrically Excited Surface Wave Spectroscopy (EESWS), which measures the response of excited surface waves by applying an electric field at the surface. By applying these two techniques, the very low frequency is accessible to study the surface hydrodynamics of polymer solutions, monolayers and gels. We will present some of experimental data of polymer solutions and gels, and compare with theories. (author)
[en] This paper examines the effect of energy price uncertainty on firm-level investment. An error correction model of capital stock adjustment is estimated with data on U.S. manufacturing firms. Higher energy price uncertainty is found to make firms more cautious by reducing the responsiveness of investment to sales growth. The result is robust to consideration of energy intensity by industry. The effect is greater for high growth firms. It must be emphasized that the direct effect of uncertainty is not estimated. Conditional variance of energy price is obtained from a GARCH model. Findings suggest that stability in energy prices would be conducive to greater stability in firm-level investment. (author)
[en] Revered-phase LC-electrospray ionization mass spectrometry was used to selectively determine enalapril from plasma with minimal sample preparation. Detection limit of the method was 1 ng/mL. Precision (within day and between days) and accuracy of the method at various concentrations were acceptable. The analytical technique was used for pharmacokinetic studies after administration of enalapril to human test subjects
[en] We synthesized three novel poly(norbornene bisimide)s by ring opening metathesis polymerization (ROMP) and subsequent hydrogenation. Their thermal, mechanical and optical properties were investigated with TGA, DMA, UV-Vis spectrometer, and optical reflectometer. The new polymers showed high glass transition temperatures over 260 .deg. C and good thermal stability with 5% wt-loss temperature higher than 390 .deg. C. When solvent casted, they yielded optically transparent and dimensionally stable films with a relatively low coefficient of thermal expansion of about 50 ppm K-1. Therefore, the bisimide moieties substantially enhanced thermal and dimensional stabilities, as compared with normal ROMP-prepared polynorbornene films. Though the water uptake was increased to 0.6 wt-%, this water uptake is still considerably lower than that for polyethersulfones (1.4 wt-%) or polyimides (2.0 wt-%). Hence, the new poly(norbornene bisimide)s may become attractive candidates for flexible substrates of optoelectronic devices such as displays and photovoltaic solar cells
[en] We report the potentials and limitations of computational fluid dynamics (CFD) analysis of patient-specific intracranial model with modification of proximal and distal length. Flow pattern does not seem to be affected by the length of proximal internal carotid artery. However, most of the flow was directed to the shorter distal part. Our study could serve as a technical reference to validating other tools and CFD results.