Cuantificación, caracterización y análisis de la comercialización de leña en Puerto Williams, Isla Navarino, Xll región

Romero, J.;Cruz, G. Facultad de Ciencias Forestales. Universidad de Chile. Santiago, Chile.Se cuantificó, caracterizó y analizó la comercialización de leña en Puerto Williams para el sector productores y comercializadores de leña, en términos de: métodos de extracción y acopio de leña, características de los productos ofertados y vías de comercialización; y para el sector consumidores de leña en cuanto a: forma de adquisición y almacenamiento de los productos, características del consumo de leña y utilización de gas licuado como combustible alternativo. Este último sector fue subdividido en subsectores: domiciliario, industrial y de servicios. Se obtuvo como resultado que la mayoría de los productores no realizan acopio de leña. Las unidades transadas poseen único precio de venta, y se comercializan principalmente en estado verde o semi-seco, y de modo informal. La máxima demanda por leña se concentra en el primer cuatrimestre del año, en tanto que la mínima demanda ocurre durante el último trimestre. El consumo anual total alcanza a aproximadamente 15.000 m3 sólidos, con participación de 65%, 30% y 5% por parte de los subsectores domiciliario, servicios e industria respectivamente. El consumo promedio de leña por vivienda es de 27,4 m3 sólidos /año; en tanto que para los servicios es de 127,1 m3 sólidos. Por último, cada industria utiliza un promedio anual de 720 m3 sólidos. La leña es utilizada fundamentalmente para calefacción. El gas licuado se usa principalmente para cocción de alimentos y obtención de agua caliente. La proporción de utilización de combustibles es altamente favorable para leña. Su participación en la matriz energética analizada (leña/gas licuado/petróleo) es del 71%.Proyecto FONDEF D02 I 108

Inducing charges and currents from extra dimensions

In a particular variant of Kaluza-Klein theory, the so-called induced-matter theory (IMT), it is shown that any configuration of matter may be geometrically induced from a five-dimensional vacuum space. By using a similar approach we show that any distribution of charges and currents may also be induced from a five-dimensional vacuum space. Whereas in the case of IMT the geometry is Riemannian and the fundamental equations are the five-dimensional Einstein equations in vacuum, here we consider a Minkowskian geometry and the five-dimensional Maxwell equations in vacuum.Comment: 8 pages. Accepted for publication in Modern Physics Letters

Furrow and Ridge Soil Nitrogen Mineralization in a Surface Irrigated Artichoke Field

[EN] Quantitative knowledge of soil organic nitrogen net mineralization (NNM) in field conditions is crucial to optimize N fertilization of crops. In a field fertilization trial of artichokes 48 PE tubes were inserted to 20 cm depth in the soil in plant row and irrigation furrows and soil samples were periodically taken during two and a half months to determine NNM. A parallel essay with disturbed samples from the same procedence was carried out in the laboratory at 25ºC and 10 kPa soil water tension. Soil sample position (ridge and furrow) did not significantly determined NNM in the laboratory essay. Although NNM (obtained from laboratory incubation and corrected to field soil temperature and moisture monitored during the experimental period) overpredicted measured field NNM, matching of both was better than those reported in other studies. NNM rate for the 76 days period of incubation predicted from lab data was 22.9 kg N/ ha x 0.1 m while corresponding field values corrected by Br- or Cl- mass balance were 10% and 20% lower respectively in ridge position and under 40% lower by either method in furrow position.The research reported in this paper was supported by a fund from CICYT-INIA (project RTA01-117-C2-2)Lidón, A.; Bautista, I.; De La Iglesia, F.; Oliver Talens, J.; Llorca, R.; Cruz-Romero, G. (2006). Furrow and Ridge Soil Nitrogen Mineralization in a Surface Irrigated Artichoke Field. Acta Horticulturae. (700):71-74. https://doi.org/10.17660/ActaHortic.2006.700.7S717470

¿Hay evidencias de déficits gemelos en la economía dominicana?

The aim of this article is to examine the existence or not of the "twin deficits" in the case of the Dominican Republic in the period 1955-2014. Using an error correction vector (VEC), the results confirm a positive long run relationships between fiscal and trade balance deficits. Similarly, bidirectional causality between deficits is verified using the Granger test. However, the results of the variance decomposition show inconclusive results regarding causality. The results of impulse response functions suggest that the consequences of large budget and trade balance deficits become noticeable only over the long run. Additionally, the influence of factors such as trade openness and financial development contribute new elements that contribute to validate the model

Aritmética en coma flotante y programación en ensamblador en las prácticas de Estructura de Computadores: Control de un simulador de radar

La enseñanza del lenguaje ensamblador es complicada debido a la dificultad que supone a los alumnos enfrentarse a un lenguaje de bajo nivel. La experiencia nos dice que plantear unas prácticas atractivas al alumno les hace interesarse por dicho lenguaje y por la asignatura de Estructura de los Computadores I (en la que se estudia, en la Universidad de Granada). La programación de un control de radar puede ser una práctica atractiva a los alumnos, de forma que la programación en ensamblador resulte casi un juego conforme mejoran la programación del cálculo de las coordenadas

Dielectric Characterization of Breast Biopsied Tissues as Pre-Pathological Aid in Early Cancer Detection: A Blinded Feasibility Study

Dielectric characterization has significant potential in several medical applications, providing valuable insights into the electromagnetic properties of biological tissues for disease diagnosis, treatment planning, and monitoring of therapeutic interventions. This work presents the use of a custom-designed electromagnetic characterization system, based on an open-ended coaxial probe, for discriminating between benign and malignant breast tissues in a clinical setting. The probe’s development involved a well-balanced compromise between physical feasibility and its combined use with a reconstruction algorithm known as the virtual transmission line model (VTLM). Immediately following the biopsy procedure, the dielectric properties of the breast tissues were reconstructed, enabling tissue discrimination based on a rule-of-thumb using the obtained dielectric parameters. A comparative analysis was then performed by analyzing the outcomes of the dielectric investigation with respect to conventional histological results. The experimental procedure took place at Complejo Hospitalario Universitario de Toledo—Hospital Virgen de la Salud, Spain, where excised breast tissues were collected and subsequently analyzed using the dielectric characterization system. A comprehensive statistical evaluation of the probe’s performance was carried out, obtaining a sensitivity, specificity, and accuracy of 81.6%, 61.5%, and 73.4%, respectively, compared to conventional histological assessment, considered as the gold standard in this investigation

Detection of Bartonella bovis DNA in blood samples from a veterinarian in Mexico

The genus Bartonella encompasses 38 validated species of Gram-negative, facultative intracellular bacteria that colonize the endothelial cells and erythrocytes of a wide spectrum of mammals. To date, 12 Bartonella species have been recorded infecting humans, causing diseases of long historical characterization, such as cat scratch fever and trench fever, and emerging bartonellosis that mainly affect animal health professionals. For this reason, this study aimed to report a documented case of Bartonella bovis infecting a veterinarian from Mexico by the amplification, sequencing and phylogenetic reconstruction of the citrate synthase (gltA) and the RNA polymerase beta-subunit (rpoB) genes, and to report the natural course of this infection. To our knowledge, this work is the first to report the transmission of B. bovis via needlestick transmission to animal health workers in Latin America