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Search Results: 1 - 10 of 45116 matches for " Juan Manuel "
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Embedding PV and WF Models into Steady State Studies by an Optimization Strategy  [PDF]
Juan Manuel Ramirez
Smart Grid and Renewable Energy (SGRE) , 2011, DOI: 10.4236/sgre.2011.23027
Abstract: Modeling of photovoltaic (PV) and wind farms (WF) stations to take into account these renewable energies into the power flow formulation are summarized. A strategy based on multi objective optimization in order to allocate PV and WF power into electrical power system is proposed. It is assumed that there are a reduced number of choices to allocate the stations. The algorithm is applied to the 39-bus test power system. The results show that the proposed algorithm is capable of optimal placement of renewable units.
Modeling of Multi-Pulse VSC Based SSSC and STATCOM  [PDF]
Pavel Zuniga- Haro, Juan Manuel Ramirez
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.23022
Abstract: The aim of this paper is to contribute to the dynamic modeling of multi-pulse voltage sourced converter based static synchronous series compensator and static synchronous compensator. Details about the internal functioning and topology connections are given in order to understand the multi-pulse converter. Using the 24 and 48-pulse topologies switching functions models are presented. The models correctly represent commutations of semiconductor devices in multi-pulse converters, which consequently allows a precise representation of harmonic components. Additionally, time domain models that represent harmonic components are derived based on the switching functions models. Switching functions, as well as time domain models are carried out in the original abc power system coordinates. Effectiveness and precision of the models are validated against simulations performed in Matlab/Simulink®. Additionally, in order to accomplish a more realistic comparison, a laboratory prototype set up is used to assess simulated waveforms.
Consolidation of Ancient Raw Materials Using a Reversible, Elastic, Soft Polymer  [PDF]
Juan Manuel Navarrete, Gustavo Leonardo Martínez
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.21006
Abstract: Aging of ancient raw materials usually finish with disintegration, which starts on surface of walls to progress toward the inside mass of a huge variety of mineral compounds. This is particularly harmful when antique buildings keep mural paintings, which suffers destruction before the wall itself. Same case appears on sculptures and monuments, whose surfaces are often attacked by living organisms which start a deterioration process previous to complete disintegration. The main factor to produce these unwanted effects is humidity, either rain for materials exposed to open air, or underground humidity going up by capillarity of minerals, in this case represented by porosity of associated salts forming the material. This paper describes a method to measure easily the relative porosity of diverse raw materials at laboratory level, by using a radioactive labeled solution, and also a procedure to reduce their porosity of those minerals. The efficiency of this procedure is measured in the same way, and so the results obtained at laboratory level have encouraged its use at real scale, where it has been quite successful for a number of materials in a limited span of five years.
Un análisis prosopográfico de algunas formas actuales de movilización armada en Colombia
Castellanos,Juan Manuel;
Revista Latinoamericana de Ciencias Sociales, Ni?ez y Juventud , 2011,
Abstract: in this paper i summarize the analysis of some armed mobilization ways in colombia in the beginning of 21th century and ends of the 20th. i put together the analysis of the current state camp and the civil war market in colombia as a structural condition with the varied armed mobilization ways associated, in a group of recruits from different legal and illegal armed groups in colombia but without enclose a reference to armed gangs and common crime members. i try to incorporate the agreement relationships between objective conditions and subjective dispositions which are combined in a generative model of political armed mobilization.
The autoimmune tautology
Juan-Manuel Anaya
Arthritis Research & Therapy , 2010, DOI: 10.1186/ar3175
Abstract: Autoimmune diseases are chronic conditions initiated by the loss of immunological tolerance to self-antigens and represent a heterogeneous group of disorders that afflict specific target organs or multiple organ systems. The chronic nature of these diseases places a significant burden on the utilization of medical care, direct and indirect economic costs, and quality of life. Almost all autoimmune diseases disproportionately affect middle-aged women and are among the leading causes of death for this group of patients. With increasing age of patients, the female-to-male ratio for autoimmune diseases becomes more prominent.The autoimmune tautology refers to the fact that autoimmune diseases share several clinical signs and symptoms, physiopathologic mechanisms, and genetic factors and this fact indicates that they have a common origin (Table 1). In the previous issue of Arthritis Research & Therapy, Eyre and colleagues [1] report that variation within the TAGAP gene, at 6q25.3, is associated with three autoimmune diseases, namely rheumatoid arthritis, type 1 diabetes, and coeliac disease, in Caucasians. In addition, the authors confirmed other loci associated with these diseases in their population: CTLA-4, the IL2-21 region, 6q23 (TNFAIP3), SH2B3, PRKCQ, and MMEL1 [1].The impact of genetic predisposition on susceptibility to autoimmune diseases was first identified by the analysis of disease concordance rates in monozygotic twins (concordance rates ranged from about 15% to 57%) [2]. The decrease in the concordance rates of siblings compared with the rate among monozygotic twins supports the presence of multiple genes contributing to the autoimmune phenotype onset.A primary characteristic of complex diseases is that affected individuals tend to cluster in families (that is, familial aggregation, also referred to as recurrence risk). Recurrent associations of autoimmune diseases in family members of patients have been reported. Although non-genetic factors may have an
Mercado de trabajo y condiciones de vida en Mendoza a comienzos del siglo XX
Cerdá,Juan Manuel;
Mundo agrario , 2006,
Abstract: the aim of this work is to analyze the changes and continuities during the process of formation of the labor market in the province of mendoza in the early 1900s. wide sectors of the mendoza population saw their life conditions and social interactions change as a result of the absorption of a significant amount of immigrants by the end of 19 th century, together with a restructuring of production connected to the development of the wine industry. shortly after the turn of the century, wine had become the main productive activity of that province, which was the most important of the field in nation-wide terms. people involved in different stages of the wine production, from vine growers to industrialists, took part in a society increasingly heterogeneous and diverse. a society, product of the development of capitalism that went on in the province in the last third of 19 th century, that played a part in the process of inclusion of the argentinean economy in the world market. this period is of great significance because the productive system consolidated around wine production, thus shaping the regional labor market. in this context, the insertion of laborers was uneven in a productive process that requires highly seasonal and unspecialized labor.
De la referencia de los términos y enunciados a la referencia de las teorías: novedad de la propuesta sneedena
Jaramillo U,Juan Manuel;
Discusiones Filosóficas , 2011,
Abstract: this paper intends to do a general presentation of the problem of theoretical terms and some of the problems caused by what hempel called "requisite of linguistic specification" as well as the insufficiency of his main solutions in the framework of the received view or standard philosophy of science, giving special attention to ramsey's solution and the way sneed reworks it by paraphrasing it in modelistic terms and introducing substantive changes. as a result of these modifications, known as the "empirical assertion", that come with the theory (the ramsey-sneed assertion), i try to show the change from a philosophical worry for the referent of terms or statements, to an interest for the referent of theories, distinguishing what it would be their immediate referent, namely the intensional applications or data models from their mediate referent, the empirical systems that the intensional applications (data models) represent as a subclass of the potential models, both in isolated theories and in theoretical nets, what requires to propose a new kind of "empirical assertion".
Estructuralismo francés y estructuralismo metateórico
Jaramillo Uribe,Juan Manuel;
Discusiones Filosóficas , 2009,
Abstract: in this paper, i intend to link the structuralism developed in france between 1960 and 1970 for the social and human sciences with the metatheoric structuralism developed by joseph d. sneed in 1971 as an extension of bourbaki's program. to this end, i will consider as a 'bridge' the algebraic work about claude lévi-strauss' theory on the elementary structures of kinship completed by the bourbakian mathematician andré weil. i intend to show that weil not only wants to demonstrate that the algebraic models of permutation are a case of elemental structure in the sense of lévi-strauss, but also, that thanks to that formalization, french structuralism obtains a mathematical notion of "structure" (instead of a linguistic one) in which some of its properties, intuitively identified by lévi-strauss, are pined down. furthermore, i will discuss -beyond the intentions of weil- whether elementary systems of kinship are adequately represented by the elementary models of permutation that weil introduces, i.e., whether they are models in the structuralist sense.
La filosofía del entendimiento, de andrés bello: factum revolucionario
Cuartas R,Juan Manuel;
Discusiones Filosóficas , 2009,
Abstract: we return to andrés bello's work to integrate his deliberations to the history of philosophy. in 1829, at the request of simón bolivar, bello brought back to america not one but many revolutions: he organized "public instruction" in chile, was principal of the new universidad de chile, redacted the código civil chileno, oriented foreign policy, redacted tratado de derecho internacional, and lastly, happily culminated his gramática de la lengua castellana destinada al uso de los americanos (1847). among these revolutionary tasks, it is worth exploring the aspect of one of them, represented in filosofia del entendimiento. the task thus proposed, however, is not that simple, because the revolution in this work is strong in relation to outdated philosophical systems oriented to the prescription of behavioural canons and to the observation of dogmas.
Enfermedad incurable en la Espa?a del siglo XIX: el Hospital para Hombres Incurables Nuestra Se?ora del Carmen
Zaragoza,Juan Manuel;
Dynamis , 2012, DOI: 10.4321/S0211-95362012000100007
Abstract: this paper examines the state's assumption of medical care for patients with "permanent needs" in 19th century spain. these patients were the incurably ill, the chronically ill and the elderly. this process is contextualized within the liberal reforms of the spanish healthcare system in the reign of isabel ii (1833-1868). the goal of these reforms was the creation and consolidation of a national health system that would gradually replace the religious health charities. healthcare reform became necessary due to the increase in migration that started in the 1830's and intensified in the 1850's. traditional care networks formed by the family, local community and religious charities were no longer available to those who had left their village or town. in addition, many religious charities were bankrupted by the seizure of their properties in a programme of confiscation. similar healthcare reform processes were taking place in the united kingdom, france and germany, among other european countries, and involved significant changes in the lives of patients, who became strictly controlled and medicalised. my aim was to identify changes in the patients' experience of illness through a case study of the living conditions of inmates at the nuestra se?ora del carmen hospital for incurable men, based in madrid from 1852 to 1949. this was one of the institutions devoted to caring for patients with "permanent needs" and was under the direct control of the general state administration.
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