Sarcophagidae (Diptera) atraídos a cadáveres de cochinillo, con nuevas citas para la fauna portuguesa

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Statistical measure of complexity for quantum systems with continuous variables

The Fisher-Shannon statistical measure of complexity is analyzed for a continuous manifold of quantum observables. It is probed then than calculating it only in the configuration and momentum spaces will not give a complete description for certain systems. Then a more general measure for the complexity of a quantum system by the integration of the usual Fisher-Shannon measure over all the parameter space is proposed. Finally, these measures are applied to the concrete case of a free particle in a box.Comment: 6 pages, 5 figures. Published versio

A comparative study between wmms and tls for the stability analysis of the San Pedro church barrel vault by means of the finite element method

Stability of masonry constructions is highly conditioned by the geometric disposition of its elements due to its low tensile strength and great compressive mechanical properties. Under this framework, this paper attempts to evaluate the suitability of a wearable mobile mapping solution, equipped in a backpack and based on the well-known simultaneous location and mapping paradigm, for the structural diagnosis of historical constructions. To evaluate the suitability of this device, the structural analysis obtained is compared with a high precision terrestrial laser scanner, which is considered as ground truth. The Romanesque church of San Pedro (Becerril del Carpio, Spain) was selected as a study case. This construction, initially conceived in the XIIIth century, has experimented in the past a soil settlement promoting the leaning of the north wall, several plastic hinges in its barrel vault and a visible geometrical deformation. The comparison of both techniques was carried out at different levels: i) an evaluation of the time needed to obtain the point cloud of the church; ii) an accuracy assessment based on the comparison of a terrestrial network using artificial spheres as checkpoints and; iii) an evaluation of the discrepancies, in terms of safety factor and collapse topology, found during the advance numerical evaluation of the barrel vault by means of the finite element method. This comparison places this wearable mobile mapping solution as an interesting tool for the creation of advanced numerical simulations to evaluate the structural stability of historical constructionsJunta de Castilla y León | Ref. SA075P17FEDER | Ref. SOE1/P5/P025

Diseño constructal de CPCs y la evolución de los diseños Tolokatsin

CIES2020 - XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia SolarRESUMEN: En el presente trabajo, se demuestra el truncamiento óptimo de los CPCs empleando la Ley Cosntructal, estableciendo diferentes grupos funcionales que establecen los grados de libertad del sistema. Los grados de libertad involucran los parámetros geométricos que repercuten de manera directa en la potencia térmica que incide sobre el absorbedor (función objetivo). Al realizar la variación de los parámetros geométricos, se identifica el valor óptimo de operación. Posteriormente, se analiza la evolución de los diseños Tolokatsin en los 30 años de existencia, verificando un óptimo desempeño mediante una serie de pruebas experimentales en las que se recabaron mediciones de temperatura e irradiancia, para cuantificar la potencia térmica útil (carga de calentamiento) en el horno solar.ABSTRACT: In the present work, the optimal truncation of the CPCs is demonstrated using the Cosntructal Law, establishing different functional groups that establish the degrees of freedom of the system. The degrees of freedom involve the geometric parameters that directly affect the thermal power that affects the absorber (objective function). When performing the variation of the geometric parameters, the optimum operating value is identified. Subsequently, the evolution of Tolokatsin designs in the 30 years of existence is analyzed, verifying optimum performance through a series of experimental tests in which temperature and irradiance measurements were collected, to quantify the useful thermal power (heating load) in the solar oven.info:eu-repo/semantics/publishedVersio

Molecular gas at supernova local environments unveiled by EDGE

CO observations allow estimations of the gas content of molecular clouds, which trace the reservoir of cold gas fuelling star formation, as well as to determine extinction via H$_2$ column density, N(H$_2$). Here, we studied millimetric and optical properties at 26 supernovae (SNe) locations of different types in a sample of 23 nearby galaxies by combining molecular $^{12}$C$^{16}$O (J = 1 $\rightarrow$ 0) resolved maps from the EDGE survey and optical Integral Field Spectroscopy from the CALIFA survey. We found an even clearer separation between type II and type Ibc SNe in terms of molecular gas than what we found in the optical using H$\alpha$ emission as a proxy for current SF rate, which reinforces the fact that SNe Ibc are more associated with SF-environments. While A$_V$ at SN locations is similar for SNe II and SNe Ibc, and higher compared to SNe Ia, N(H$_2$) is significantly higher for SNe Ibc than for SNe II and SNe Ia. When compared to alternative extinction estimations directly from SN photometry and spectroscopy, we find that our SNe Ibc have also redder color excess but showed standard Na I D absorption pseudo-equivalent widths ($\sim$1 \AA). In some cases we find no extinction when estimated from the environment, but high amounts of extinction when measured from SN observations, which suggests that circumstellar material or dust sublimation may be playing a role. This work serves as a benchmark for future studies combining last generation millimeter and optical IFS instruments to reveal the local environmental properties of extragalactic SNe.Comment: MNRAS accepted, 17 pages, 8 Figures, 4 Table

Malignant nerve sheath tumor involving glossopharyngeal, vagus and spinal nerve with intracranial-extracranial extension and systemic metastases in a patient with type 1 neurofibromatosis: A case report

AbstractIntroductionIntracranial malignant peripheral nerve sheath tumors are an extremely rare pathology with a high morbidity and mortality. Epidemiological, clinical and prognostic data are scarce and with little certainty in the literature. The aim of this paper is to report for first time in English literature, the case of a patient with type 1 neurofibromatosis, who presented a malignant peripheral nerve sheath tumor that involved the left glossopharyngeal, vagus and spinal nerves with intracranial and extracranial extension through jugular foramen and systemic metastases.Presentation of caseA 37 years-old female patient with malnutrition and Villaret́s syndrome. It was confirmed by brain magnetic resonance imaging and PET-CT the presence of a neoplasic lesion which was radiologically compatible with malignant peripheral nerve sheath tumor with systemic metastases. Partial surgical resection was performed; the patient postoperative course was without significant clinical improvement but with added peripheral facial palsy. The patient did not accept adjuvant management because of personal reasons.Discussion and conclusionBehavior therapy is unclear due to the low frequency of the disease and the lack of case series, representing a challenge for the physician in its approach and a poor prognosis for the patient

Análisis de la línea base de metales pesados en zonas agrícolas de Colombia

Los recursos naturales ofertan una serie de bienes y servicios necesarios para el desarrollo económico y el bienestar social del hombre. El recurso suelo, oferta servicios ecosistémicos fundamentales entre las que se resaltan: el soporte para la producción de alimentos y su importancia en la mitigación de los efectos del cambio climático debido a la dinámica del carbono. Sin embargo, actividades antrópicas como la densificación urbana, la industrialización y principalmente la agrícultura aportan elementos como metales pesados y estos son responsables de la degradación del suelo en algunas regiones del mundo. Naturalmente los suelos en su base geoquímica tienen metales pesados y en la mayoría de las regiones éstas concentraciones no representan riesgo ambiental, aunque en zonas con mayor presión antrópica las concentraciones han aumentado. En este sentido, el propósito de la presente investigación fue recopilar los estudios de metales pesados desarrollados en sistemas de producción agrícola en Colombia, y con esto establecer una línea base que permita identificar necesidades futuras de investigación en esta temática. Entre los resultados encontrados, se identificó que los metales pesados estudiados en el país son Cd>Pb>Hg>Cr>Ni>Cu=Zn=As>Mn>Fe, destacándose el Cd, Pb y Hg metales de mayor toxicidad. Sin embargo, en Colombia la producción científica es relativamente baja: apenas en las bases de datos se localizaron 31 artículos relacionados con metales pesados en la producción agrícola (suelo, cultivos o insumo). Asimismo, estos trabajos se localizaron en la región central del país, evidenciando que en regiones como la Orinoquia, considerada como la frontera y despensa agrícola del país, únicamente se reportaron tres estudios publicados en los últimos años. Finalmente con esto se resalta la importancia de generar investigaciones en áreas productoras de alimentos y además de generar valores de referencia para estos elementos en los suelos colombianos que permitan evaluar posible contaminación.Trabajo publicado en Acta Bioquímica Clínica Latinoamericana; no. 52, supl. 2, parte I, diciembre de 2018.Universidad Nacional de La Plat

Peasant strategies for the use and conservation of native corn in Juchitepec, Estado de México

ABSTRACT Objective: To gather some knowledge on maize landraces evolution within Juchitepec municipality, as well as describe and analyze those strategies carried out by peasant families in its use and conservation. Design/methodology/approach: A survey on 20 farmers from Juchitepec municipality was carried out, they were randomly sampled from “Producción para el bienestar” state program beneficiaries list. Additionally, a series of key informants semi-structured interviews were taken prior to the survey in order to address the main topics of importance in relation to maize within the region. Results: The studied population presented an advanced age (=61), nonetheless some young farmers has an important role within their production units. 75% own less than 6 Ha, mostly on ejido land. 89% maintains maize landraces cultivation. This task is achieved through adapting their practices and knowledge to specific conditions on cropfields. Some adjustments are made i.e.: changing sowing date, using different varieties or species, alternating crop fields. 17% grows hybrid maize varieties. Two native introduced landraces were identified, Ancho y Cacahuacintle, as a way of improving farmers’ income. Some practices like the “de dos” cultivation are suffering changes as a result of machinery and economic resources availability. 100% of farmers use chemical fertilizers and herbicides. Commercialization of corn husk is an important economic activity. Seed exchange is frecuent, commonly between same community members. Ozumba market represents an important commercialization channel for native maize. Government settled prices for maize in 2019 weren´t high enough for native maize. Juchitepec farmers don´t get organized for maize production purposes. 65% consider themselves campesinos. Limitations on study/implications: Local agrarian system studies focused on peasant strategies should consider changes in behavior of peasants under different circumstances in order to better understand its adaptability. Findings/conclusions: Native maize survives within Juchitepec region sustained by peasants through knowledge and strategies applied on the reproduction and recreation of this varieties. Peasant strategies strengthen native maize conservation. Keywords: in situ conservation, plant genetic resources, traditional knowledgeObjective: To determine the evolution that native corn has had in the municipality of Juchitepec, as well as to describe and analyze the strategies that peasants families are currently implementing for its use and conservation. Design/methodology/approach: A survey was carried out with 20 peasants in the municipality of Juchitepec, chosen from a random sample obtained from the register of the Producción para el Bienestar program. Additionally, a series of semi-structured interviews were conducted with key informants, in order to identify the most important issues around corn in the region. Results: An elderly population was found (=61), but with some young people working decisively in its production units. Seventy-five percent own less than 6 ha, mostly communal land property. Eighty-nine percent of the farmers interviewed continue to grow native corn. They achieve this by adapting their practices and knowledge to the soil and climate conditions of their plots, modifying, for example, the sowing date, the variety or species cultivated, and the place of cultivation. Seventeen percent grow hybrid corn. Two native varieties have recently been introduced as a strategy to obtain greater profitability: ancho and cacahuacintle. Some practices are being modified based on the equipment and the economic resources available, such as the “de dos” labor that only 50% of the farmers carry out. Eighty percent do not have agricultural equipment. The use of chemical fertilizers and herbicides is widespread. The sale of corn husks is an economically important activity. Peasants frequently exchange seeds, usually with other members of their own community. The Ozumba market represents a vitally important marketing channel for native corn. The guaranteed prices established in 2019 were low for this type of corn. Peasants are not formally organized for corn cultivation. Sixty-five percent consider themselves peasants. Study limitations/implications: The study of local agrarian systems with a focus on peasant strategies should contemplate acting under different circumstances, preferably in several work cycles, to better understand their adaptability. Findings/conclusions: Native corn survives in the region, preserved in a socio-productive system based on peasant knowledges, strategies and socio-technical practices that enable its reproduction and recreation. Peasant strategies for the cultivation and use of these corns strengthen their conservation