Crecimiento económico e inflación: el caso de México

The analysis focuses on the short-run dynamics of several macroeconomic variables and their relationship with the rate of inflation. The cyclical components of the variables are obtained through the Hodrick- Prescott filter. Contemporaneous correlations between the cyclical components show that inflation rates above their long-term trend are associated with below trend economic activity, employment, investment and real wages and with nominal and real interest rates above their trend. Non-contemporaneous correlations show that inflation has an adverse effect on the referred variables. Results are confirmed through “impulse-response” functions.

Una nota sobre la conjetura del grupo de autotopismos de los presemicuerpos de Figueroa

In [4] was stated the following conjecture: If a Figueroa’s presemifield P(K; alfa; beta; A;B) admits an autotopism of order a p-primitive prime divisor of p^n-1, then its autotopism group is isomorphic to a subgroup of GL(K) x GL(K). In [5] this conjecture was settled under an additional normality condition. In this article, we show that the assumption in the hypothesis of the conjecture is necessary in the sense that there exist a Figueroa’s presemifield, that does not admit such autotopism, for which the conjecture is not met.En [4] se estableció la siguiente conjetura: Si un presemicuerpo de Figueroa P(K; alfa; beta; A;B) admite un autotopismo de orden un divisor primo p-primitivo de p^n-1, entonces su grupo autotopismo es isomórfo a un subgrupo de GL(K) x GL(K). En [5] esta conjetura se resolvió bajo una condición adicional de normalidad.En este artículo, mostramos que la suposición hecha en la hipótesis de la conjetura es necesaria en el sentido de que existe un presemicuerpo de Figueroa, que no admite tal autotopismo, para el cual la conjetura no se cumple

Effect of shear processing on the linear viscoelastic behaviour and microstructure of bitumen/montmorillonite/MDI ternary composites

Polymer modified bitumens (PMBs) have largely been utilized as a construction material. However, lack of affinity between bitumen and polymer leads to phase separation, and eventually, performance depletion. In this paper, alternative formulations of bitumen with an organically-modified montmorillonite (OMMT) Cloisite 20A® and polymeric methylene diphenyl diisocyanate (MDI) were prepared by melt blending. Their comprehensive rheological characterization evidenced improved linear viscoelastic properties when OMMT is added, revealing a noticeable structural reinforcement and thermal stability. Rheological data also showed that MDI-involved reactions control the composite end properties, being greatly influenced by the shear conditions applied

Volatilidad del tipo de cambio y tasas de interés en México: 1996-2001

It is argued that in Mexico there is not a fear of floating in the Calvo-Reinhart sense and that the market, as a result of the monetary policy instrument (corto), has determined a reatively stable exchange rate and more volatile interest rates. Thus, thé instantaneous interest rate response to exogenous shocks limits the exchange rate role as a buffer to the referred disturbances. Empirical evidence shows that explicit interest rate targets result in higher exchange rate volatility and lower interest rate variability.volatility, exchange rate, interest rates

Sectores productivos y espacios de conflicto: pesca y petróleo en la sonda de Campeche

Objetivo y planteamiento del problema: La Sonda de Campeche es una zona marítima del Golfo de México en donde por más de 60 años se ha realizado la explotación de dos importantes recursos naturales para la economía nacional y regional de esta región: las pesquerías del camarón y la extracción de petróleo. Ambas actividades, aunque comparten el mismo espacio, son completamente diferentes en cuanto a la extracción de sus respectivos productos. Esencialmente, la actividad pesquera del camarón está sujeta a varios condicionamientos para su desarrollo: primero, de carácter físico-biológico y territorial; segundo, a las relaciones comerciales de carácter internacional, nacional y local; tercero, a las normatividades y reglamentaciones de carácter gubernamental y de observancia pública por parte del sector involucrado en la actividad. En tanto que la actividad petrolera está sujeta a otros condicionamientos: primero, existe una demanda del mercado nacional e internacional; segundo, es un energético de la cual depende la industria y la economía de los países industrializados y no industrializados. El objetivo del trabajo es presentar un panorama de ambas actividades productivas en un mismo espacio marítimo territorial, hoy día en conflicto por la intervención de diversos actores sociales y agentes económicos que dan pie a la reconfiguración del territorio. Esto se hace mediante la identificación de diversas escalas de análisis espacial por etapas. Conclusiones: Se señalan los intereses de los actores en espacios de conflictos, lo cual impide el desarrollo articulador de ambos sectores productivos importantes para la región y para los intereses geoestratégicos nacionales e internacionales

Correlation-mediated processes for electron-induced switching between Néel states of Fe antiferromagnetic chains

The controlled switching between two quasistable Néel states in adsorbed antiferromagnetic Fe chains has recently been achieved by Loth et al. using tunneling electrons from an STM tip. In order to rationalize their data, we evaluate the rate of tunneling electron-induced switching between the Néel states. Good agreement is found with the experiment, permitting us to identify three switching mechanisms: (i) low STM voltage direct electron-induced transitions, (ii) intermediate STM voltage switching via spin-wave-like excitation, and (iii) high STM voltage transitions mediated by domain-wall formation. Spin correlations in the antiferromagnetic chains are the switching driving force, leading to a marked chain-size dependence. © 2013 American Physical Society.M.Y. and X. C. acknowledge financial support through Spain’s MINECO under Contract No. TEC2009-06986.Peer Reviewe

Progress in the influence of recycled construction and demolition mineral-based blends on the physical–mechanical behaviour of ternary cementitious matrices

[Abstract:] The serious technical and environmental problems associated with the management of construction and demolition wastes (CDW) have led to a worldwide growing interest in the recycling of that waste stream as secondary raw material for sustainable building applications. This research work investigates the physical and mechanical behaviour of mortars made with ternary cements containing 7% of a binary recycled CDW mixture comprising the fine fraction (<5 mm) of recycled concrete waste (both siliceous and calcareous nature) in combination with recycled laminar glass in three different proportions (1/1, 1/2, and 2/1, respectively). To this end, the chemical composition and fineness of the anhydrous ternary cements were analysed, as well as their behaviour in paste and mortar matrices, in both fresh and hardened states, verifying the requirements established by the applicable standards. The results attest to the viability of using these ternary cements, as their performance is comparable to that of an ordinary Portland cement (OPC), without evidencing any significant dependence on the glass content. The compressive strength values decrease by 7–8% with respect to that of the OPC mortar, revealing the prevalence of the filler effect over the pozzolanic reaction. The ternary cements analysed in this study met the chemical, physical and mechanical requirements for the elaboration of future eco-efficient cements.Ministerio de Ciencia, Innovación y Universidades; RTI2018-097074-B-C21-2