Partisan Profiles in Presidential Policies: an Extension of Presidential Preferences for Inflation versus Unemployment

In a recent article, Zaleski does not find any clear difference between the political preferences of Republican and Democratic administrations with respect to the choice between unemployment and inflation. This paper provides empirical support for the opposite conclusion in a generalization of Zaleski's approach allowing for instrument costs

Influence of thermal treatment conditions on porosity development and mechanical properties of activated carbon cloths from a novel nanofibre-made fabric

Activated carbon cloths (ACC)were prepared fromTencel®, a novel regenerated cellulose nanofibre fabric, by phosphoric acid activation in an inert atmosphere using different thermal treatment conditions. The effect of the final thermal treatment temperature (663–963 ◦C) and temperature programme (temperature of isothermal step and heating rate) on yield, elemental composition, porosity development and mechanical strength of the resulting ACC were examined. Nitrogen isotherms at −196 ◦C, carbon dioxide isotherms at 0 ◦C, breaking loads and Youngs modulus values were determined for all the samples. Adsorption data were fitted to different models (BET, Dubinin–Radushkevich, ˛S) to evaluate textural parameters of the ACC. The samples were essentially microporous and presented good physical appearance. Higher treatment temperatures resulted in higher BET surface areas and total pore volumes, also leading to larger micropore widths. The ACC prepared at 963 ◦C showed maximum BET surface area (1705m2 g−1) and total pore volume (0.67 cm3 g−1). On the other hand the best mechanical strength was observed at 864 ◦C after a lower temperature isothermal step. Overall, the results indicated a stronger dependence of surface area, total pore volume, microporosity development and mechanical strength on the final treatment temperature than on the temperature programme

Krypton adsorption as a suitable tool for surface characterization of multi-walled CNTs

Multi-walled carbon nanotubes (CNTs), pristine and subjected to treatments, are comparatively characterized from N2 and Kr (77 K) adsorption measurements. The CNTs are lab-synthesized by in situ chemical vapour deposition of an iron-based organometallic compound at 895 °C. The treatments applied to the CNTs include low temperature gas-phase oxidation, mild temperature annealing and ultrasonic dispersion in ethanol, in an attempt to examine possible changes in adsorption characteristics. N2 and Kr adsorption measurements give rise to steadily increasing and stepped isotherms, respectively. The former are representative of a multilayer adsorption phenomenon, while the latter indicate successive monolayer condensation. The treatments affect differently gas adsorption capacities of the CNTs. Oxidation leads to CNTs with higher BET specific surface area and increased adsorption capacity, though the effect is more pronounced for Kr adsorption. Ultrasonic dispersion of the CNT brings about a significant reduction only in N2 adsorption capacity. Modifications in the characteristic steps in Kr adsorption isotherms of the CNTs subjected to annealing can be appreciated, although no remarkable changes are observed in N2 adsorption isotherms. Present results demonstrate that determination of Kr adsorption isotherms represents a more suitable tool to obtain a more reliable textural characterization of CNTs than does N2 adsorption.Fil: Zilli, Dario Adrian. Universidad de Buenos Aires. Programa de Investigación y Desarrollo de Fuentes Alternativas de Materias Primas y Energía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Bonelli, Pablo Ricardo. Universidad de Buenos Aires. Programa de Investigación y Desarrollo de Fuentes Alternativas de Materias Primas y Energía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Gommes, C. J.. Université de Liège; BélgicaFil: Blacher, S.. Université de Liège; BélgicaFil: Pirard, J. P.. Université de Liège; BélgicaFil: Cukierman, Ana Lea. Universidad de Buenos Aires. Programa de Investigación y Desarrollo de Fuentes Alternativas de Materias Primas y Energía; Argentina. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

2010a): Real Business Cycles with Cournot Competition and Endogenous Entry

Abstract We introduce Cournot competition and endogenous entry in an otherwise neoclassical macroeconomic framework. First, we develop a model with exogenous savings à la Solow describing the dynamic path of business creation. Then, we develop a model à la Ramsey describing the dynamic interaction of consumption and business creation. Our models are able to explain why markups vary countercylically and pro…ts are procyclical. The analysis of permanent and temporary technology and preference shocks and of the second moments suggests that our model can outperform the Real Business Cycle framework in many dimensions. We are grateful t