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Search Results: 1 - 10 of 326081 matches for " Jesús Loureiro "
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ESTUDIO DE LA INCIDENCIA DE LOS INCENDIOS EN GALICIA: UNA PERSPECTIVA SOCIOECONóMICA
JESúS BARREAL PERNAS,MARíA LOUREIRO GARCíA,JUAN PICOS MARTíN
Revista Galega de Economía , 2011,
Abstract: Muchos trabajos relacionan la acción del fuego con las aptitudes físicas o meteorológicas de la zona, pero no inciden en aquellos condicionantes de tipo socioeconómicos que afectan a la ocurrencia de incendios. A raíz de este hueco en la literatura, este trabajo analiza el impacto de variables socioeconómicas que afectan a la propagación de los incendios como son, por ejemplo, la estructura poblacional o los usos agrícolas y ganaderos. Para ello, se emplea una regresión lineal a partir de datos municipales, corrigiendo los errores estándar de los coeficientes por la heterogeneidad de cada municipio en Galicia, junto con una regresión Poisson. Entre los resultados obtenidos más relevantes destaca la importancia del papel de la densidad poblacional, junto con los diferentes usos agrarios y ganaderos de la tierra, así como la importancia de la efectividad de la organización geográfica de las medidas contra los incendios, así como las dotaciones económicas destinadas a los servicios preventivos.
Are the Mesothelial-to-Mesenchymal Transition, Sclerotic Peritonitis Syndromes, and Encapsulating Peritoneal Sclerosis Part of the Same Process?
Jesús Loureiro,Guadalupe Gónzalez-Mateo,José Jimenez-Heffernan,Rafael Selgas
International Journal of Nephrology , 2013, DOI: 10.1155/2013/263285
Abstract:
Are the Mesothelial-to-Mesenchymal Transition, Sclerotic Peritonitis Syndromes, and Encapsulating Peritoneal Sclerosis Part of the Same Process?
Jesús Loureiro,Guadalupe Gónzalez-Mateo,José Jimenez-Heffernan,Rafael Selgas,Manuel López-Cabrera,Abelardo Aguilera Peralta
International Journal of Nephrology , 2013, DOI: 10.1155/2013/263285
Abstract: Mesothelial-to-mesenchymal transition (MMT) is an autoregulated physiological process of tissue repair that in uncontrolled conditions, such as peritoneal dialysis (PD), can lead to peritoneal fibrosis. The maximum expression of sclerotic peritoneal syndromes (SPS) is the encapsulating peritoneal sclerosis (EPS) for which no specific treatment exists. The SPS includes a wide range of peritoneal fibrosis that appears progressively and is considered as a reversible process, while EPS does not. EPS is a serious complication of PD characterized by a progressive intra-abdominal inflammatory process that results in bridles and severe fibrous tissue formation which cover and constrict the viscera. Recent studies show that transdifferentiated mesothelial cells isolated from the PD effluent correlate very well with the clinical events such as the number of hemoperitoneum and peritonitis, as well as with PD function (lower ultrafiltration and high Cr-MTC). In addition, in peritoneal biopsies from PD patients, the MMT correlates very well with anatomical changes (fibrosis and angiogenesis). However, the pathway to reach EPS from SPS has not been fully and completely established. Herein, we present important evidence pointing to the MMT that is present in the initial peritoneal fibrosis stages and it is perpetual over time, with at least theoretical possibility that MMT initiated the fibrosing process to reach EPS. 1. Introduction Peritoneal dialysis (PD) is a form of renal replacement therapy that uses the peritoneal membrane (PM) as semipermeable barrier for the exchange of toxic substances and water. This technique has increased during the last years, in parallel to its complications. Currently, prolonged survival on PD has been reached due to technological advances, prevention, and early diagnosis of uremic complications. The basic objective of DP is the long-term preservation of the PM function. The PM is lined by a monolayer of MCs that have characteristics of epithelial cells and act as a permeability barrier across which ultrafiltration and diffusion take place. The long-term exposure to hyperosmotic, hyperglycaemic, and low pH of dialysis solutions and repeated episodes of peritonitis or hemoperitoneum cause injury of the peritoneum, which progressively becomes denuded of MCs and undergoes fibrosis and neovascularization [1]. Such structural alterations are considered the major cause of ultrafiltration failure [1, 2]. In this context, it has been proposed that local production of vascular endothelial growth factor (VEGF), a potent proangiogenic cytokine,
Calculation of the Gravitational Constant G Using Electromagnetic Parameters  [PDF]
Jesús Sánchez
Journal of High Energy Physics, Gravitation and Cosmology (JHEPGC) , 2017, DOI: 10.4236/jhepgc.2017.31012
Abstract: In this paper, we will derive the following formula for the value of the gravitational constant G: \"\" (1). This equation has only 0.81% error compared to the common accepted value \"\" [1]. The parameters in the equation are the following: \"\" the fine structure constant, q the elementary charge, \"\" the mass of the electron, \"\" the permittivity of the free space, e the exponential function and \"\" the relation between a circumference and its diameter. Values attached: \"\" [2], \"\"</span
Calculation of the Fine-Structure Constant  [PDF]
Jesús Sánchez
Journal of High Energy Physics, Gravitation and Cosmology (JHEPGC) , 2018, DOI: 10.4236/jhepgc.2018.43029
Abstract: The fine-structure constant α [1] is a constant in physics that plays a fundamental role in the electromagnetic interaction. It is a dimensionless constant, defined as: \"\" (1) being q the elementary charge, ε0 the vacuum permittivity, h the Planck constant and c the speed of light in vacuum. The value shown in (1) is according CODATA 2014 [2]. In this paper, it will be explained that the fine-structure constant is one of the roots of the following equation: \"\" (2) being e the mathematical constant e (the base of the natural logarithm). One of the solutions of this equation is: \"\" (3) This means that it is equal to the CODATA value in nine decimal digits (or the seven most significant ones if you prefer). And therefore, the difference between both values is: \"\" (4) This coincidence is higher in orders of magnitude than the commonly accepted necessary to validate a theory towards experimentation. As the cosine function is periodical, the Equation (2) has infinite roots and could seem the coincidence is just by chance. But as it will be shown in the paper, the separation among the different solutions is sufficiently high to disregard this possibility. It will also be shown that another elegant way to show Equation (2) is the following (being i the imaginary unit): \"\" (5) having of course the same root (3). The possible meaning of this other representation (5) will be explained.
How to Check If a Number Is Prime Using a Finite Definite Integral  [PDF]
Jesús Sánchez
Journal of Applied Mathematics and Physics (JAMP) , 2019, DOI: 10.4236/jamp.2019.72028
Abstract: In the history of mathematics different methods have been used to detect if a number is prime or not. In this paper a new one will be shown. It will be demonstrated that if the following equation is zero for a certain number p, this number p would be prime. And being m an integer number higher than (the lowest, the most efficient the operation). \"\" . If the result is an integer, this result will tell us how many permutations of two divisors, the input number has. As you can check, no recurrent division by odd or prime numbers is done, to check if the number is prime or has divisors. To get to this point, we will do the following. First, we will create a domain with all the composite numbers. This is easy, as you can just multiply one by one all the integers (greater or equal than 2) in that domain. So, you will get all the composite numbers (not getting any prime) in that domain. Then, we will use the Fourier transform to change from this original domain (called discrete time domain in this regards) to the frequency domain. There, we can check, using Parseval’s theorem, if a certain number is there or not. The use of Parseval’s theorem leads to the above integral. If the number p that we want to check is not in the domain, the result of the integral is zero and the number is a prime. If instead, the result is an integer, this integer will tell us how many permutations of two divisors the number p has. And, in consequence information how many factors, the number p has. So, for any number p lower than 2m?- 1, you can check if it is prime or not, just making the numerical definite integration. We will apply this integral in a computer program to check the efficiency of the operation. We will check, if no further developments are done, the numerical integration is inefficient computing-wise compared with brute-force checking. To be added, is the question regarding the level of accuracy needed (number of decimals and number of steps in the numerical integration) to have a reliable result for large numbers. This will be commented on the paper, but a separate study will be needed to have detailed conclusions. Of course,
Impact of Sex on Worker’s Effort within Efficiency Wage Setting  [PDF]
Paulo R. A. Loureiro, Jaime Orrillo, Tito B. S. Moreira
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.22024
Abstract: We provided a simple equilibrium model where both the wage paid by firms and the sexual frequency of their workers are determined in equilibrium. The analysis is carried out within an efficiency wage model where the worker’s effort is influenced, in addition to wage, by the willingness to work. The concept of equilibrium used in this paper is that of Nash.
Multinationals and interdependence in internationalisation processes
Rezende, Sérgio Fernando Loureiro;
BAR. Brazilian Administration Review , 2006, DOI: 10.1590/S1807-76922006000100002
Abstract: this article deals with interdependence and the internationalisation process of multinationals (mncs); a topic that has received scarce attention in the literature (e.g. bell & young, 1998; holm et al., 1995). by reviewing the literature on behavioural models of internationalisation, initially, the article suggests that mncs should be regarded as loosely coupled systems in which independence and interdependence of operations shape how mncs evolve and organise activities across borders. subsequently, the article models the internationalisation process of mncs by highlighting three dimensions that characterise their pattern of evolution - uniformity, direction and rhythm, and lays out three hypotheses on the relationship between these dimensions and interdependence. the direction of the relationship is suggested to be negative, i.e., other things being equal, interdependence is negatively related to uniformity, direction and the rhythm of the internationalisation processes. the article concludes by claiming that the internationalisation of mncs results from an intricate combination of independent, yet interdependent, internationalisation processes that evolve in various spatial and temporal contexts within the mnc network.
Multinationals and interdependence in internationalisation processes
Rezende, Sérgio Fernando Loureiro;
Revista de Administra??o Contemporanea , 2006, DOI: 10.1590/S1415-65552006000500002
Abstract: this article deals with interdependence and the internationalisation process of multinationals (mncs); a topic that has received scarce attention in the literature (e.g. bell & young, 1998; holm et al., 1995). by reviewing the literature on behavioural models of internationalisation, initially, the article suggests that mncs should be regarded as loosely coupled systems in which independence and interdependence of operations shape how mncs evolve and organise activities across borders. subsequently, the article models the internationalisation process of mncs by highlighting three dimensions that characterise their pattern of evolution - uniformity, direction and rhythm, and lays out three hypotheses on the relationship between these dimensions and interdependence. the direction of the relationship is suggested to be negative, i.e., other things being equal, interdependence is negatively related to uniformity, direction and the rhythm of the internationalisation processes. the article concludes by claiming that the internationalisation of mncs results from an intricate combination of independent, yet interdependent, internationalisation processes that evolve in various spatial and temporal contexts within the mnc network.
Internationalisation processes: an analytical framework
Rezende, Sérgio Fernando Loureiro;
Revista de Administra??o Contemporanea , 2003, DOI: 10.1590/S1415-65552003000200008
Abstract: in this article we propose a framework for analysing internationalisation processes, manifested through a sequence of servicing modes. a servicing turn is, in turn, the institutional arrangement whereby firms operate in foreign markets. the framework borrows conceptual notions from the literature on foreign market entry, internationalisation and subsidiary development. three implications for empirical studies are subsequently suggested. first, it is argued that internationalisation processes should be analysed in light of intra and inter-organisational relationships embedded in distinct spatial and temporal contexts. secondly, the framework takes into account not only incremental but also discontinuous internationalisation processes. thirdly, it is proposed that internationalisation processes are endless phenomena and, therefore, should consider sequences of servicing modes that take place in the foreign market where the entry mode is originally embedded as well as in foreign markets reached from the initial host country.
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