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The time‑varying effects of oil prices on oil-gas stock returns of the fragile five countries

Financial Innovation 2021年第1期7卷 39-60页

作者： begüm yurteri köedağlı Gül Huyugüzel kışla A.NazifÇtık Ege Universitesi İzmirTurkey

This study analyzes oil price exposure of the oil–gas sector stock returns for the fragile five countries based on a multi-factor asset pricing model using daily data from 29 may 1996 to 27 January *** endogenous structural break test suggests the presence of serious parameter instabilities due to fluctuations in the oil and stock markets over the period under ***,the time-varying estimates indicate that the oil–gas sectors of these countries are riskier than the overall stock *** results further suggest that,except for Indonesia,oil prices have a positive impact on the sectoral returns of all markets,whereas the impact of the exchange rates on the oil–gas sector returns varies across time and countries.

关键词： Sectoral stock return Oil price Time-varying parameter model Fragile five

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Scalable gas-phase processes to create nanostructured particles

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Particuology 2010年第6期8卷 572-577页

作者： J.Ruud van Ommen Caner U.yurteri Naoko Ellis Erik m.kelder Delft University of Technology Department of Chemical EngineeringJulianalaan 1362628 BL DelftThe Netherlands University of British Columbia Department of Chemical and Biological Engineering2360 East MallVancouverB.C.Canada V6T 1Z3

The properties of nanoparticles are often different from those of larger grains of the same solid material because of their very large specific surface area. This enables many novel applications, but properties such as agglomeration can also hinder their potential use. By creating nanostructured particles one can take optimum benefit from the desired properties while minimizing the adverse effects. We aim at developing high-precision routes for scalable production of nanostructured particles. Two gas-phase synthesis routes are explored. The first one - covering nanoparticles with a continuous layer - is carried out using atomic layer deposition in a fluidized bed. Through fluidization, the full surface area of the nanoparticles becomes available. With this process, particles can be coated with an ultra-thin film of constant and well-tunable thickness. For the second route - attaching nanoparticles to larger particles - a novel approach using electrostatic forces is demonstrated. The micron-sized particles are charged with one polarity using tribocharging. Using electrospraying, a spray of charged nanoparticles with opposite polarity is generated. Their charge prevents agglomeration, while it enhances efficient deposition at the surface of the host particle. While the proposed processes offer good potential for scale-up, further work is needed to realize large-scale processes.

关键词： Nanoparticles Nanocomposite materials Coating Films Particle coating Atomic layer deposition Core-shell particles Electrospraying Electrohydrodynamic atomization Electrostatic forces Fluidization

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