7,074 research outputs found
Las matemáticas del cambio climático
No full textilustracionesEn el presente número ofrecemos a nuestros lectores el artículo Las matemáticas del cambio climático, del profesor Carlos M. Madrid Casado.
El artículo del profesor Madrid Casado ofrece una visión del cambio climático diferente a la que hemos estado recibiendo a través de los medios de comunicación no científicos. (texto tomado de la fuente
The use of glycerine in rations for light lamb during the fattening period
No full textOne hundred and two Ripollesa weaned lambs (15 +/- 1.7 kg BW; 45 +/- 7.9 days of age) from two different lambing periods (Period 1 n = 39 and Period 2 n = 63) were used to study three different diets that included 0 g/kg, 50 g/kg or 100 g/kg glycerine in the concentrate. Lambs were fed concentrate (180 g/kg CP, 18.7 MJ of GE/kg DM) and barley straw ad libitum until the slaughter weight (25 SEM = 1.4 kg BW). Lambs were distributed in 9 pens per period in groups of 4 or 5 lambs (Period 1) and 7 lambs (Period 2) according to their weaning BW and age, and BW and concentrate and straw intakes as well as water consumption were measured weekly. Blood samples to determine glucose and insulin concentrations were obtained at 2 and 4 wk of the study, and carcass weight was recorded at the slaughterhouse. At slaughterhouse a sample of rumen mucosa of the caudal sac of the ventral zone was obtained to determine the number of rumen papillae, and a sample of the Longissimus dorsi from ten female lambs per treatment was obtained to analyse fatty acid profile of the meat. None of the parameters measured in lambs were affected by the glycerine content of concentrates. The only differences observed were in meat fatty acid composition. The 02 (P=0.08) and C17 (P=0.06) tended to be greater in lambs fed concentrates with glycerine than without glycerine. In contrast, total amount of C18:1 cis in muscle tended (P=0.10) to be greater in lambs consuming a concentrate without glycerine than in lambs receiving concentrates with glycerine. Glycerine can be included as an ingredient in lamb diets during their fattening period without impairing the growth of lambs, without reducing concentrate or straw intake, and without affecting blood metabolites, rumen papillae development, and the main fatty acids of L dorsi muscle. (C) 2010 Elsevier B.V. All rights reserved
The use of glycerine in rations for light lamb during the fattening period
No full textOne hundred and two Ripollesa weaned lambs (15 ± 1.7. kg BW; 45 ± 7.9 days of age) from two different lambing periods (Period 1 n= 39 and Period 2 n= 63) were used to study three different diets that included 0. g/kg, 50. g/kg or 100. g/kg glycerine in the concentrate. Lambs were fed concentrate (180. g/kg CP, 18.7. MJ of GE/kg DM) and barley straw ad libitum until the slaughter weight (25 SEM = 1.4 kg BW). Lambs were distributed in 9 pens per period in groups of 4 or 5 lambs (Period 1) and 7 lambs (Period 2) according to their weaning BW and age, and BW and concentrate and straw intakes as well as water consumption were measured weekly. Blood samples to determine glucose and insulin concentrations were obtained at 2 and 4. wk of the study, and carcass weight was recorded at the slaughterhouse. At slaughterhouse a sample of rumen mucosa of the caudal sac of the ventral zone was obtained to determine the number of rumen papillae, and a sample of the Longissimus dorsi from ten female lambs per treatment was obtained to analyse fatty acid profile of the meat. None of the parameters measured in lambs were affected by the glycerine content of concentrates. The only differences observed were in meat fatty acid composition. The C12 (P=0.08) and C17 (P=0.06) tended to be greater in lambs fed concentrates with glycerine than without glycerine. In contrast, total amount of C18:1 cis in muscle tended (P=0.10) to be greater in lambs consuming a concentrate without glycerine than in lambs receiving concentrates with glycerine. Glycerine can be included as an ingredient in lamb diets during their fattening period without impairing the growth of lambs, without reducing concentrate or straw intake, and without affecting blood metabolites, rumen papillae development, and the main fatty acids of L. dorsi muscle. © 2010 Elsevier B.V
An assessment of the risk to surface water ecosystems of groundwater P in the UK and Ireland
No full textA good quantitative understanding of phosphorus (P) delivery is essential in the
design of management strategies to prevent eutrophication of terrestrial
freshwaters. Most research to date has focussed on surface and near-surface
hydrological pathways, under the common assumption that little P leaches to
groundwater. Here we present an analysis of national patterns of groundwater
phosphate concentrations in England and Wales, Scotland, and the Republic of
Ireland, which shows that many groundwater bodies have median P concentrations
above ecologically significant thresholds for freshwaters. The potential risk to
receptor ecosystems of high observed groundwater P concentrations will depend on
(1) whether the observed groundwater P concentrations are above the natural
background; (2) the influence of local hydrogeological settings (pathways) on
the likelihood of significant P transfers to the receptor; (3) the sensitivity
of the receptor to P; and, (4) the relative magnitude of P transfers from
groundwater compared to other P sources. Our research suggests that, although
there is often a high degree of uncertainty in many of these factors,
groundwater has the potential to trigger and/or maintain eutrophication under
certain scenarios: the assumption of groundwater contribution to river flows as
a ubiquitous source of dilution for P-rich surface runoff must therefore be
questioned. Given the regulatory importance of P concentrations in triggering
ecological quality thresholds, there is an urgent need for detailed monitoring
and research to characterise the extent and magnitude of different groundwater P
sources, the likelihood for P transformation and/or storage along aquifer-
hyporheic zone flow paths and to identify the subsequent risk to receptor
ecosystems. (C) 2009 Elsevier B.V. All rights reserved
A short geostatistical study of the three-dimensional spatial structure of fumonisins in stored maize
No full textThe heterogeneous three-dimensional spatial distribution of mycotoxins has
proven to be one of the main limitations for the design of effective sampling
protocols. Current sample collection protocols for mycotoxins have been designed
to estimate the mean concentration and fail to characterise the spatial
distribution of the mycotoxin concentration due to the aggregation of the
incremental samples. Geostatistical techniques have been successfully applied to
overcome similar problems in many research areas. However, little work has been
developed on the use of geostatistics for the design of sampling protocols for
mycotoxins. This paper focuses on the analysis of the two and three-dimensional
spatial structure of fumonisins B1 (FB1) and B2 (FB2) in maize in a bulk store
using a geostatistical approach and on how results help determine the number and
location of incremental samples to be collected. The spatial correlation between
FB1 and FB2, as well as between the number of kernels infected and the level of
contamination was investigated. For this purpose, a bed of maize was sampled at
different depths to generate a unique three-dimensional data set of FB1 and FB2.
The analysis found no clear evidence of spatial structure in either the two-
dimensional or three-dimensional analyses. The number of Fusarium infected
kernels was not a good indicator for the prediction of fumonisin concentration
and there was no spatial correlation between the concentrations of the two
fumonisins
Interleukins 1β and 10 expressions in the periimplant crevicular fluid from patients with untreated periimplant disease
No full textPURPOSE:: To analyze the interleukin (IL)-1β and IL-10 expressions in periimplant crevicular fluid (PICF) in healthy and diseased regions to elucidate the inflammatory process around implants and its influence on clinical diagnosis. MATERIALS AND METHODS:: PICF samples from 30 patients were analyzed for IL-1β and IL-10 concentrations by enzyme-linked immunosorbent assay. Patients were divided in Groups A (health), B (mucositis), and C (periimplantitis). Plaque accumulation, periodontal phenotype (PP), depth on probing, and history of periodontitis (HP) were evaluated. RESULTS:: IL-1β levels were lower in healthy group compared with Groups B (P < 0.0005) and C (P < 0.001). IL-10 levels were higher in Groups A compared with B (P = 0.033) and C (P = 0.0001). Patients with HP and thin PP had 9 and 4.5 times more chance of presenting disease, respectively. CONCLUSIONS:: Lower IL-1β and higher IL-10 levels characterized healthy periimplant conditions, which demonstrate the anti-inflammatory predominance in sites without disease signs. IL-10 levels decrease significantly according to increase of disease status. Therefore, its levels can differentiate healthy, mucositis, and periimplantitis. Thin PP and HP are associated with periimplant disease. These findings suggest the use of ILs as a biochemical marker for early diagnosis of periimplant disease. Copyright © 2013 by Lippincott Williams & Wilkins
Online_Appendix - Examining the determinants of job satisfaction among tourism workers
No full textOnline_Appendix for Examining the determinants of job satisfaction among tourism workers by Adelaida Lillo-Bañuls, José M Casado-Díaz, and Hipólito Simón in Tourism Economics</p
Carlos Fernández Casado y José Acuña: los primeros puentes de altura estricta. Jaén, 1933-1935
No full textThe bridge design catalogue “Puentes de altura Estricta” (Strict Height Bridges) was one of the greatest creations of the brilliant spanish civil engineer Carlos Fernandez Casado. It was designed at the early 1930’s. It had a great relevance in the Spanish Civil Engineering of the 20th century. Nevertheless, its origins are little known.
The first materializations of the “Collection” were six bridges that were constructed in the Jaén province, between 1933 and 1935. They were possible thanks to the determined support of other civil engineer, Jose Acuña y Gómez de la Torre. Later also he carried out the work himself.
With this research its process of design and construction is reconstructed. Also bridges are described as they have come to the present day. With all this it is expected its great value as heritage elements be recognized.La “Colección de Puentes de Altura Estricta” fue una de las mayores creaciones del genial ingeniero de caminos español Carlos Fernández Casado. Fue diseñada a principios de los años 1930 y tuvo una gran trascendencia en la Ingeniería civil española del siglo XX. No obstante, sus orígenes son poco conocidos.
Las primeras materializaciones de la “Colección” fueron seis puentes que se construyeron en la provincia de Jaén, entre 1933 y 1935. Fueron posibles gracias al decidido apoyo que prestó otro ingeniero de caminos, José Acuña y Gómez de la Torre. Posteriormente también se hizo cargo de su ejecución material.
Con esta investigación se pretende reconstruir su proceso de diseño y construcción. También se describen los puentes tal como han llegado hasta nuestros días. Con todo ello se espera contribuir a que sea reconocido su gran valor como elementos patrimoniales
El cálculo de estructuras en la obra de Carlos Fernández Casado
No full textIn the present paper the contributions of Carlos Fernández Casado to Structural Analysis are reviewed. After a description of the international context he was working in, his contributions and their relation to the academic training he received at the Civil Engineering Scholl in Madrid are described. Finally the most interesting aspects of his written work are commented.En este artículo se analizan las aportaciones de Carlos Fernández Casado al cálculo de estructuras. Tras exponer el contexto internacional, se describen sus contribuciones y su relación con la formación que recibió en la Escuela de Ingenieros de Caminos de Madrid. Se finaliza indicando algunos de los méritos más interesantes de su obra escrita
CLIL, a competence-based coping strategy against foreign language anxiety in higher education
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• Madrid D, Julius S. Profiles of students in bilingual university degree programs using English as a medium of instruction in Spain. Profile: Issues in Teachers’ Prof Dev 2020;22:79–94. https://doi.org/10.15446/profile.v22n2.80735.This article presents a study carried out in the subject of Didactics of English for Very Young Learners, taught in English to Spanish-speaking students at the School of Education of the Complutense University of Madrid, Spain. Three comparable classes were exposed to different teaching and assessment conditions. Two of them were the research groups, learning under a competence-based CLIL (Content and Language Integrated Learning) paradigm, while the control group did so under a content-based EMI (English-Medium Instruction) model. The participants (n = 76) were asked to answer two questionnaires, which collected their expectations (pre-questionnaire) and final perceptions (post-questionnaire) in regard to their levels of anxiety towards studying in English. The qualitative and quantitative comparison of their answers facilitated results that allowed to discuss and conclude the beneficial effect of CLIL as a competence-based coping strategy to diminish foreign language anxiety among student teachers who face the challenge of learning in a bilingual classroom setting.Depto. de Didáctica de las Lenguas, Artes y Educación FísicaFac. de EducaciónTRUEpu
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