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Search Results: 1 - 10 of 15997 matches for " Rafael Portillo Medina "
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Cooperación horizontal: las experiencias exitosas en mitigación de la pobreza en la región zuliana
Lissette Hernández Fernández,Rafael Portillo Medina,Domingo Méndez Rivero,Elisabeth Ochoa
Espacio Abierto , 1999,
Abstract: El presente artículo tiene por objeto destacar la importancia de la cooperación horizontal , como un mecanismo de administración gerencial que garantiza la permanencia y sustentabilidad de los programas sociales para mitigar pobreza. Entendiéndose por cooperación horizontal la modalidad aplicada a los programas sociales de reducción de la pobreza que propicia la alianza entre el sector público o el sector político estatal, que ocupa el rol clave de regulador, de rector de las políticas públicas y de la sociedad; el sector privado, con fines de lucro, generalmente dedicado a la producción y distribución de bienes que generalmente es competitivo e innovador; y la sociedad civil, sin fines de lucro, integrada por organizaciones de intermediación y representación de intereses de diversa índole que generalmente es organizada, participativa, y corresponsable en los proyectos de desarrollo...
Persistent Non-ergodic Fluctuations in Mesoscopic Insulators
Rafael Rangel,Ernesto Medina
Physics , 2002,
Abstract: We give a detailed and rigorous picture of the mesoscopic conductance fluctuations in the deep insulating regime (DIR) within the Nguyen, Spivak and Shklovskii model including spin-orbit coupling (SO). Without SO, we find that fluctuations of the log-conductance are persistent above a saturation field $% B_s$, where one has that the log-conductance is approximately a stationary random process. In contrast, in the SO case the saturation field $B_s$ is negligible and the stationarity is well realized. We find non-vanishing disorder fluctuations of the field average of the log-conductance as a quantitative measure of the lack of ergodicity in the mean square sense. As a consequence the commonly used criterion to test the ergodicity based on the equivalence of the variance in disorder and the variance in the field is not fulfilled. Using the replica approach, we derive the weak localization analogs of the `cooperon and diffuson.
INCREMENTANDO LAS RELACIONES COMERCIALES ENTRE COLOMBIA Y CHINA
AHCAR OLMOS,JAIME RAFAEL; OSORIO MEDINA,EMMA;
Estudios Gerenciales , 2008,
Abstract: after the reforms of the late 1970s, china achieved such a strong economic take-off that it was able to consolidate into one of today's most important markets worldwide, catching the attention of business people and researchers around the globe. in colombia few studies have been conducted to examine commercial relations with china . in this respect, this paper provides a thorough review of statistical sources and bibliographical references, shedding light on the characteristics of and the factors affecting bilateral commercial relations. it shows that, although china is an important supplier of goods to colombia , exports to that country remain below their potential, thus generating a huge commercial deficit. it also shows that colombian exports to china focus on a limited number of products and, given the size and potential of the chinese economy, colombia should begin commercial negotiations with china for the purpose of signing a free trade agreement that would make it possible to increase trade between both countries.
Economic evaluation of the incorporation of flow cytometry technology in the Hospital El Cruce-High complexity in network
Emilia Scandizzo,Rafael Kurtzbart,Arnaldo Medina
Medwave , 2010,
Abstract:
Incrementando las relaciones comerciales entre Colombia y China
JAIME RAFAEL AHCAR OLMOS,EMMA OSORIO MEDINA
Estudios Gerenciales , 2008,
Abstract: Después de las reformas de fi nales de los a os setenta, China consiguió su despegue económico a tal punto que, en la actualidad, se consolida como uno de los mercados más importantes del mundo, recibiendo la atención de investigadores y hombres de negocios a lo largo del planeta. En Colombia existen pocos estudios que hayan explorado las relaciones comerciales con China; en tal sentido, el presente artículo ofrece una amplia revisión de fuentes estadísticas y referencias bibliográfi cas, dando luces sobre las características y los factores que afectan las relaciones comerciales bilaterales. Los resultados muestran que, si bien China es un valioso proveedor de mercancías para Colombia, las exportaciones hacia ese país aún se encuentran por debajo de su potencial, y se genera un défi cit comercial enorme. También muestra que las exportaciones colombianas hacia China se hallan concentradas en unos pocos productos y que dado el tama o y potencialidad de esta economía, se deberían comenzar negociaciones comerciales que busquen la fi rma de un acuerdo de libre comercio que permita incrementar el comercio entre ambos países.
Magneto-Conductance Anisotropy and Interference Effects in Variable Range Hopping
Ernesto Medina,Mehran Kardar,Rafael Rangel
Physics , 1995, DOI: 10.1103/PhysRevB.53.7663
Abstract: We investigate the magneto-conductance (MC) anisotropy in the variable range hopping regime, caused by quantum interference effects in three dimensions. When no spin-orbit scattering is included, there is an increase in the localization length (as in two dimensions), producing a large positive MC. By contrast, with spin-orbit scattering present, there is no change in the localization length, and only a small increase in the overall tunneling amplitude. The numerical data for small magnetic fields $B$, and hopping lengths $t$, can be collapsed by using scaling variables $B_\perp t^{3/2}$, and $B_\parallel t$ in the perpendicular and parallel field orientations respectively. This is in agreement with the flux through a `cigar'--shaped region with a diffusive transverse dimension proportional to $\sqrt{t}$. If a single hop dominates the conductivity of the sample, this leads to a characteristic orientational `finger print' for the MC anisotropy. However, we estimate that many hops contribute to conductivity of typical samples, and thus averaging over critical hop orientations renders the bulk sample isotropic, as seen experimentally. Anisotropy appears for thin films, when the length of the hop is comparable to the thickness. The hops are then restricted to align with the sample plane, leading to different MC behaviors parallel and perpendicular to it, even after averaging over many hops. We predict the variations of such anisotropy with both the hop size and the magnetic field strength. An orientational bias produced by strong electric fields will also lead to MC anisotropy.
Active Case Finding of Pulmonary Tuberculosis through Screening of Respiratory Symptomatics Using Sputum Microscopy: Is It Time to Change the Paradigm?
Eva Carolina del Portillo-Mustieles,Rafael Laniado-Laborín
Tuberculosis Research and Treatment , 2013, DOI: 10.1155/2013/312824
Abstract:
Active Case Finding of Pulmonary Tuberculosis through Screening of Respiratory Symptomatics Using Sputum Microscopy: Is It Time to Change the Paradigm?
Eva Carolina del Portillo-Mustieles,Rafael Laniado-Laborín
Tuberculosis Research and Treatment , 2013, DOI: 10.1155/2013/312824
Abstract: Background. One of the main strategies for the early detection of pulmonary tuberculosis (PTB) is through the screening of individuals with symptoms compatible with PTB. Although this is programmatic strategy for active case finding, its yield is not well known. Objective. To determine the yield of pulmonary tuberculosis active case finding through the screening of respiratory symptomatic (RS) patients at a general hospital. Methods. RS patients were defined as subjects complaining of cough and/or sputum for a period of 2 or more weeks. Outpatients and their companions were approached while they waited in the outpatient care areas of the hospital to detect RS. Two samples from different days or 2 samples taken 2 hours apart on the same day were collected. Results. 122 RS patients were identified. Fifty-seven patients (46.7%) had at least one sputum sample analyzed. Three patients presented a positive smear and 2 were culture positive; neither had upper airway symptoms. None of the patients with productive cough and upper airway symptoms had a positive smear ( ). Only 19 (33.3%) returned to the laboratory to retrieve their results. Conclusion. Current strategy to screen RS patients based only on clinical data has a low compliance. Specific strategies to increase compliance (removal of barriers, incentives, etc.) should be implemented. 1. Introduction Tuberculosis (TB) represents one of the world’s public health greatest challenges. One key factor for its control is to stop the chain of transmission in the community by diagnosing and treating cases as early as possible. The planning and implementation of efficient tuberculosis control programs is crucial, and the strategies that compose them must be submitted to constant evaluation and refining. One of the main strategies for the early detection of pulmonary tuberculosis (PTB) is through the screening of individuals with symptoms compatible with PTB (in México for screening purposes defined as productive cough lasting more than two weeks), known also as respiratory symptomatic patients (RS). It is estimated that in regions with high prevalence of PTB from 5 to 10% of the patients that seek outpatient medical services are RS, and, of those, from 1 to 5% are smear positive [1]. The most recent data from Mexico [2] shows a PTB incidence of 42.1/100,000 in the state of Baja California, the highest rate in the country; Tijuana the largest city in the state has an annual rate between 50 and 60 cases per 100,000. Most of the cases were detected passively at outpatient health services and hospitals; only 3.6%
Enfoque de género: la ense?anza de la escritura de la lengua inglesa en las ciencias médicas
Forteza Fernández,Rafael; Medina Betancourt,Alberto; Dovales Borjas,Baldomero;
ACIMED , 2005,
Abstract: the following article offers the basic psychological, pedagogical, and linguistic concepts underlying the genre approach for the teaching-learning process of writing abilities of the english language. at the same time, it supplies a practical example of how genre teaching-learning can be implemented in writing practice lessons for nursing students in higher medical education.
Desórdenes del procesamiento auditivo
RUIZ RESTREPO,ISABEL JULIANA; CASTRO MEDINA,JOSé RAFAEL;
Iatreia , 2006,
Abstract: auditory processing disorders constitute a heterogeneous group of deficit in the process and analysis of the auditory signal, that affect in an important way the learning, the labor and social life of the patient that suffers them. the medical literature recognizes them for few years and even there are questions without resolving with respect to its physiopathology, diagnostic and management. this article intends to make a revision of the recent literature that permit an approach to the diagnosis and management of the patients with this type of pathologies.
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