2,378 research outputs found
How Far Do Shocks Move Across Borders? Examining Volatility Transmission in Major Agricultural Futures Markets
This paper examines the level of interdependence and volatility transmission in global agricultural futures markets. We follow a multivariate GARCH approach to explore the dynamics and cross-dynamics of volatility across major exchanges of corn, wheat, and soybeans between the United States, Europe, and Asia. We account for the potential bias that may arise when considering exchanges with different closing times. The results indicate that agricultural markets are highly interrelated and there are both own- and cross- volatility spillovers and dependence among most of the exchanges. The results also show the major role Chicago plays in terms of spillover effects over the other markets, particularly for corn and wheat. Additionally, the level of interdependence between exchanges has only increased in recent years for some of the commodities.Volatility transmission, agricultural commodities, futures markets, Multivariate GARCH.
A Radial Velocity Study of the Intermediate Polar EX Hydrae
A study on the intermediate polar EX Hya is presented, based on simultaneous
photometry and high dispersion spectroscopic observations, during four
consecutive nights. The strong photometric modulation related to with the
67-min spin period of the primary star is clearly present, as well as the
narrow eclipses associated to the orbital modulation. Since our eclipse timings
have been obtained almost 91,000 cycles since the last reported observations,
we present new linear ephemeris, although we cannot rule out a sinusoidal
variation suggested by previous authors. The system mainly shows double-peaked
H, H and HeI 5876 \AA emission lines. From the profile
of the H line, we find two components; one with a steep rise and
velocities not larger than 1000 km s and another broader component
extending up to 2000 km s, which we interpret as coming mainly
from the inner disc. A strong and variable hotspot is found and a stream-like
structure is seen at times. We show that the best solution correspond to km s from H, from the two emission components, which
are both in phase with the orbital modulation. We remark on a peculiar effect
in the radial velocity curve around phase zero, which could be interpreted as a
Rositter-MacLaughlin-like effect, which has been taken into account before
deriving . This value is compatible with the values found in
high-resolution both in the ultraviolet and X-ray. We find: M, M and
R. Doppler Tomography has been applied, to construct six Doppler
tomograms for single orbital cycles spanning the four days of observations to
support our conclusions. Our results indicate that EX Hya has a well formed
disc and that the magnetosphere should extend only to about
.Comment: 16 pages, 14 figures, accepted for publication in MNRA
Adverse events of ERCP at San José Hospital of Bogotá (Colombia)
Endoscopic retrograde cholangiopancreatography (ERCP) has become the preferred treatment method for hepatobiliary and pancreatic disease. Despite technological progress this technique continues to account for the greatest morbidity and mortality caused by digestive endoscopic procedures. ERCP carries a risk of pancreatitis, perforation, hemorrhage, cholangitis and cardiopulmonary events occurring in upto 10% of patients in referral centers, implying a mortality of up to 1%, not including therapeutic failures or the need for re-intervention. A greater mortality rate has been demonstrated in prospective studies rather than in retrospective studies, but overall, the number of complications described in the literature is much lower than the number of complications that actually occur.
A descriptive prospective study was conducted at San José Hospital from April 1, 2006 to April 30, 2007 in patients who underwent an ERCP and had a 1-month follow-up. A total of 381 patients were included; 9 (2.3%) were excluded, and of the remaining 372 there was an overall success in 79.6% of cases, 8.3% had a second intervention, 7.6% developed complications (pancreatitis, perforation, hemorrhage, cholangitis, pain, intolerance to sedatives, and cardiopulmonary events), and 4.3% were failed ERCP studies. The mortality rate of the ERCP procedure was 0.8%. ERCP-related complications were determined at a teaching center, and this suggests the need to implement centers of excellence in order to improve the efficacy of the procedure
Oxidation of the borohydride Ion at silver nanoparticles on a glassy carbon electrode (GCE) using pulsed potential techniques
Direct oxidation borohydride fuel cells are very attractive energy conversion devices. Silver has been reported as one of the few materials which can catalyze an 8-electron oxidation. Potential step amperometric pulse techniques to synthesize nanostructured silver material on flat glassy carbon electrodes is reported and significant differences with bulk silver deposit have been observed. The oxidation of borohydride ion on the silver particles occurs at -0.025 V vs. SCE and the potential decreases towards negative values at longer cycle times. The oxidation current also decreases with the number of cycles, suggesting that the silver active sites become partially blocked by oxidation products of borohydride. The electroactive area per unit electrode area of silver was relatively low for particles deposited using potential step amperometric techniques on glassy carbon (0.002 cm2 per cm-2) compared with the area found at a polycrystalline silver electrode (0.103 cm2 per cm-2
Las implicaciones de la reforma energética para Tabasco
Esta investigación tiene como finalidad aportar elementos de análisis y discusión para la reflexión sobre la temática relacionada con los aspectos socioculturales que genera el petróleo en una entidad petrolera como Tabasco. Asà como identificar algunas de las implicaciones positivas o negativas para la economÃa local y analizar los aciertos y desaciertos que se han generado a partir de la aprobación de reforma energética en el año 2013.
En esta entidad, la economÃa del estado habÃa sido desde el siglo pasado una economÃa de vocación natural, sin embargo, la explotación intensiva de hidrocarburos desde los años 80s derivado del Boom petrolero trajo como consecuencia la transformación hacia una economÃa petrolizada. La economÃa tradicional basada en el sector primario (agricultura, ganaderÃa, pesca y las agroindustrias) pasó a ser una economÃa altamente petrolizada caracterizada por un proceso de migración del campo hacia la ciudad capital asà como de otras entidades del paÃs.
Hoy después de 40 años de explotación intensiva de la actividad petrolera los tabasqueños seguimos observando el nulo crecimiento en los sectores primario y secundario en contraste con la evolución del sector terciario gigante. Con las expectativas de la reforma energética aprobada en 2013 se espera que se genere un nuevo "mini" boom petrolero con las consecuencias positivas o negativas para Tabasco que aquà se plantean. El método utilizado en esta investigación es analÃtico y descriptivo y la metodologÃa es mayormente de tipo cuantitativa mediante un modelo deductivo con el criterio que va de lo general a lo particula
LAS REFORMAS ESTRUCTURALES Y SU EFECTO EN EL DESARROLLO REGIONAL
El presente trabajo tiene la finalidad de analizar los efectos de las principales reformas estructurales aprobadas en el año 2013 e implementadas en nuestro paÃs y sus respectivos efectos en los sectores productivos de las regiones productoras de petróleo. En particular se trata de realizar un análisis de la reforma realizada al sector petrolero para revisar los indicadores económicos que están frenando el desarrollo regional.
Las desigualdades sociales en las regiones altamente petrolizadas como Tabasco, Campeche, y Veracruz, se ven reflejadas en los altos indicadores de rezago social, pobreza y marginación de su población que junto con la falta de empleos y oportunidades de trabajo están impactando en las principales actividades económicas de estas entidades. Por ello, consideramos necesario implementar acciones y estrategias regionales que atiendan de manera integral esta problemática de falta de desarrollo económico para mejorar la calidad de vida de sus habitantes de los estados afectados. Las reformas estructurales sobre todo la petrolera han provocado el desplome de la economÃa de estas regiones petroleras que hoy padecen las peores crisis. Se identificó la problemática mediante la aplicación de un modelo deductivo con el criterio que va de lo general a lo particular. La metodologÃa propuesta para el desarrollo de este trabajo es de tipo cuantitativa y consiste en realizar un análisis de la literatura relacionada con la reforma energética promovida por el Ejecutivo Federal, la consulta de libros, estadÃsticas y datos históricos de la actividad petrolera en México. Se utilizaron diversas técnicas de recolección de información como la revisión documental de revistas especializadas y medios electrónicos.
El método para el desarrollo de la investigación es analÃtico y descriptivo y la metodologÃa utilizada es de tipo cuantitativa
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