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Search Results: 1 - 10 of 31385 matches for " Nicholas; González "
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Eugenesia Liberal
Nicholas Agar,César Palacios González
Signos filosóficos , 2012,
Abstract:
EVIDENCE OF NON-MARKOVIAN BEHAVIOR IN THE PROCESS OF BANK RATING MIGRATIONS
GóMEZ-GONZáLEZ,JOSé E; KIEFER,NICHOLAS M;
Cuadernos de economía , 2009, DOI: 10.4067/S0717-68212009000100002
Abstract: this paper estimates transition matrices for the ratings on financial institutions, using an unusually informative data set. we show that the process of rating migration exhibits significant non-markovian behavior, in the sense that the transition intensities are affected by macroeconomic and bank-specific variables. we illustrate how the use of a continuous time framework may improve the estimation of the transition probabilities. however, the time homogeneity assumption, frequently done in economic applications, does not hold, even for short time intervals. thus, the information provided by migrations alone is not enough to forecast the future behavior of ratings. the stage of the business cycle should be taken into account, and individual characteristics of banks must be considered as well.
EVIDENCE OF NON-MARKOVIAN BEHAVIOR IN THE PROCESS OF BANK RATING MIGRATIONS
JOSé E GóMEZ-GONZáLEZ,NICHOLAS M KIEFER
Cuadernos de Economía , 2009,
Abstract: This paper estimates transition matrices for the ratings on financial institutions, using an unusually informative data set. We show that the process of rating migration exhibits significant non-Markovian behavior, in the sense that the transition intensities are affected by macroeconomic and bank-specific variables. We illustrate how the use of a continuous time framework may improve the estimation of the transition probabilities. However, the time homogeneity assumption, frequently done in economic applications, does not hold, even for short time intervals. Thus, the information provided by migrations alone is not enough to forecast the future behavior of ratings. The stage of the business cycle should be taken into account, and individual characteristics of banks must be considered as well. Este documento estima matrices de transición para ratings de instituciones financieras, utilizando un conjunto de datos excepcionales. Se muestra que el proceso de migración en el rating exhibe un comportamiento no Markoviano, en el sentido que la transición se ve afectada por variables macroeconómicas y por variables bancarias específicas. Mostramos que el uso de un marco de tiempo continuo puede mejorar la estimación de las probabilidades de transición. Sin embargo, el supuesto de la homogeneidad en el tiempo, frecuentemente utilizado en aplicaciones económicas, no se sostiene, incluso por breves intervalos de tiempo. Por lo tanto, la información proporcionada por las migraciones no es suficiente para predecir, por sí sola, el futuro comportamiento de los ratings, sino que debe tenerse en cuenta la fase del ciclo económico, así como las características individuales de los bancos.
Taquicardia postural ortostática en 15 pacientes: disautonomía compleja
Jiménez-Cohl,Pedro; Earle M,Nicholas; González R,Beltrán; Thieck J,Elfride;
Revista médica de Chile , 2012, DOI: 10.4067/S0034-98872012000200001
Abstract: background: patients with postural orthostatic tachycardia syndrome (pots) report dizziness, lightheadedness, weakness, blurred vision, and fatigue upon standing. the diagnosis of the syndrome is made when an orthostatic intolerance and tachycardia appear in the standing position. aim: to report 15 patients with pots. material and methods: review of tilt test reports in a period of 15 years. those reports in which orthostatic postural tachycardia and symptoms compatible with pots appeared, were selected for analysis. results: we identified 15 patients (3.1% of all positive tilt test reports) with compatible signs and symptoms. there was a lag of 8 -10 years between the onset of symptoms and the time of diagnosis. most patients complained of orthostatic intolerance, dizziness and frequent fainting. orthostatic tachycardia and symptoms occurred on average after 2.9 and 6.1 minutes, respectively,of staying in the standing position. these patients had a high frequency of family history of syncope orpresyncope (66% frequency) and hyper mobility syndrome (53% prevalence). only 33% of the patients reported relief of their symptoms after being treated (most of them with fludrocortisone). most patients that reported little or no relief, did not use medications or were treated for a short period. conclusions: pots syndrome is uncommon but disturbs quality of life of those who suffer it. its association with hyper mobility syndromes must be investigated.
Taquicardia postural ortostática en 15 pacientes: disautonomía compleja Postural orthostatic tachycardia syndrome (POTS): Report of 15 cases
Pedro Jiménez-Cohl,Nicholas Earle M,Beltrán González R,Elfride Thieck J
Revista médica de Chile , 2012,
Abstract: Background: Patients with postural orthostatic tachycardia syndrome (POTS) report dizziness, lightheadedness, weakness, blurred vision, and fatigue upon standing. The diagnosis of the syndrome is made when an orthostatic intolerance and tachycardia appear in the standing position. Aim: To report 15 patients with POTS. Material and Methods: Review of Tilt test reports in a period of 15 years. Those reports in which orthostatic postural tachycardia and symptoms compatible with POTS appeared, were selected for analysis. Results: We identified 15 patients (3.1% of all positive Tilt test reports) with compatible signs and symptoms. There was a lag of 8 -10 years between the onset of symptoms and the time of diagnosis. Most patients complained of orthostatic intolerance, dizziness and frequent fainting. Orthostatic tachycardia and symptoms occurred on average after 2.9 and 6.1 minutes, respectively,of staying in the standing position. These patients had a high frequency of family history of syncope orpresyncope (66% frequency) and hyper mobility syndrome (53% prevalence). Only 33% of the patients reported relief of their symptoms after being treated (most of them with fludrocortisone). Most patients that reported little or no relief, did not use medications or were treated for a short period. Conclusions: POTS syndrome is uncommon but disturbs quality of life of those who suffer it. Its association with hyper mobility syndromes must be investigated.
Geographic Constraints on Social Network Groups
Jukka-Pekka Onnela,Samuel Arbesman,Marta C. González,Albert-László Barabási,Nicholas A. Christakis
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0016939
Abstract: Social groups are fundamental building blocks of human societies. While our social interactions have always been constrained by geography, it has been impossible, due to practical difficulties, to evaluate the nature of this restriction on social group structure. We construct a social network of individuals whose most frequent geographical locations are also known. We also classify the individuals into groups according to a community detection algorithm. We study the variation of geographical span for social groups of varying sizes, and explore the relationship between topological positions and geographic positions of their members. We find that small social groups are geographically very tight, but become much more clumped when the group size exceeds about 30 members. Also, we find no correlation between the topological positions and geographic positions of individuals within network communities. These results suggest that spreading processes face distinct structural and spatial constraints.
VIGILANCIA CENTINELA PARA EL VIRUS DEL OESTE DEL NILO EN CULICIDOS Y AVES DOMéSTICAS EN EL DEPARTAMENTO DE CóRDOBA
Jaramillo,Manolo; Pe?a,José; Berrocal,Luis; Komar,Nicholas; González,Marco; Ponce,César; Ariza,Katiuska; Máttar,Salim;
Revista MVZ Córdoba , 2005,
Abstract: west nile virus (wnv) genus flavivirus, family flaviviridae, is maintained in nature in an enzootic cycle mosquito-bird-mosquito. birds are the main amplifying hosts. humans and horses are incidental dead-end hosts. in humans it yields a self-limited febrile disease; it can produce encephalitis and meningoencephalitis as well. wnv is wide spread in north america and its circulation has been documented in méxico, jamaica, dominican republic, guadalupe, cuba, puerto rico, el salvador and recently colombia. it was performed a sentinel surveillance in culicides and domestic birds to follow-up wnv circulation in the department of córdoba taking into account its circulation evidence in horses of this region and identifying mosquito species infected with the virus. 4.942 mosquitoes were assessed in 99 pools were assessed by vec testttm (medical system, inc. camarillo, ca) and 162 serums of domestic birds were analyzed by mac-elisa in the centers for disease control and prevention, division of vector-borne infectious diseases, fort collins, usa. due to the crossed reactions among wnv and others virus of the japonese encephalitis, a plaque reduction neutralization test (prnt) was used. there was not nor positive mosquitoes neither positives birds.
Some New Questions about the Seasonal Decrease of the Ozone Layer  [PDF]
Jaime González Velasco
Green and Sustainable Chemistry (GSC) , 2012, DOI: 10.4236/gsc.2012.23016
Abstract: The depletion-recovery cycle of the ozone layer is explained on the basis of the magnetic properties of oxygen, ozone, nitrogen oxides and chlorine combinations, which upon interaction with the Earth’s magnetic field, give rise to gaseous fluxes polar- and equatorial-wards.
What Does “Noise Pollution” Mean?  [PDF]
Alice Elizabeth González
Journal of Environmental Protection (JEP) , 2014, DOI: 10.4236/jep.2014.54037
Abstract:

Noise features different characteristics that make it different from every other “classic” pollutant. Noise is invisible; it does not smell; it disappears when the source is turned off and leaves no traces in the environment. In addition, when people perceive something wrong about their hearing capacity, it is often long time after the beginning of noise exposure. This fact contributes to strengthening the misconception that noise is not harmful to human health or, at least, efforts and funds aim preferably at controling and decreasing the emission of other pollutants. Adding to this, most people tend to consider that noise is the price to pay for accessing to the amenities of the Technological Era and it is indivisible and inevitably linked to them. Last but not least, noise pollution could adversely affect ecosystems and ecological services. Then, how is it possible to convince the decision makers that noise pollution is one of the major current environmental problems? The aim of this paper is to discuss step by step the applicability of noise of a “pollution” definition, as a way to ease the understanding that lowering environmental noise levels should be prioritized: because it will lead to a healthier and better society.

Some Ideas about the Thermal Equilibrium in the Biosphere and the Entropy Variation Ascribed to Changes in the Radiations Wavelengths  [PDF]
Jaime González Velasco
Open Journal of Physical Chemistry (OJPC) , 2015, DOI: 10.4236/ojpc.2015.54011
Abstract: An explanation is given for the thermal equilibrium in the biosphere, which is based in the equality between the thermal energy received from the sun and the thermal energy reemitted from the atmosphere to the space. In order to understand the origin of the energy that gives rise to the processes and phenomena taking place in the biosphere, it is necessary to take into account the free energy represented by the product of temperature times the change in entropy, T△S, whose magnitude can be attributed to the variation experimented by the wavelengths (or, consequently, the frequencies) of the radiations composing the radiation spectrum received from the sun compared with the radiation spectrum reemitted from the biosphere into the space. A simple discussion allows to predict that the entropy increase driving the processes is connected with a spontaneous conversion of high frequency radiations (with lower “content” of entropy) in radiations of lower frequencies (with higher “content” of entropy). A consequence of this is that high frequency radiations would correspond to more ordered states and, therefore, to less probable states than those corresponding to radiations of lower frequencies.
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