Fotografía y memoria: imágenes y lugares en la fotografía de los desaparecidos en Colombia

Los estudios clásicos sobre la memoria asocian ésta primero a un arte, el arte de recordar las cosas al asociar imágenes mentales a lugares. Este arte de la memoria se vio relegado a la esfera del individuo, mientras que la memoria social se asociaba a los procesos históricos. Hoy las imágenes no están asociadas a los lugares, muchas veces la imagen ni siquiera remite ya a un cuerpo. Este es el caso de las imágenes de los desaparecidos en el conflicto colombiano, fotografías solas sin asocio a ningún lugar que repetidas a la saciedad no hacían mella en la memoria social. Frente a este modelo, la opción de grupos juveniles que trabajan sobre la estética buscan darle un lugar a las imágenes, devolviendo la antigua unión de asociar imágenes mentales a lugares en el proceso de reconstrucción de memoria histórica en Colombia

Participación política: comunidad LGBTI en la Web 2.0

El texto da a conocer algunas características de los modos de participación política que han ido construyendo las personas pertenecientes a la comunidad LGBTI en Colombia. Se analiza la relación entre comunicación, opinión y participación política de la comunidad LGBTI, desde la percepción sobre la temática gay. Se utilizó el término gay, contrario a LGBTI, no como un sinónimo, sino con la intención de abordar las percepciones de los colombianos sobre el tema que giran sobre esta palabra. El trabajo analiza algunos datos extraídos de la encuesta de la Investigación en Comunicación y Participación Política de la Universidad Externado de Colombia. Finalmente, a partir de las conclusiones, se dejará planteada una propuesta para que posteriores investigadores profundicen en un caso particular de la Web 2.0 dándole aplicación a la temática

Predicting Global Irradiance Combining Forecasting Models Through Machine Learning

This paper has been presented at : 13th International Conference on Hybrid Artificial Intelligence Systems (HAIS 2018)Predicting solar irradiance is an active research problem, with many physical models having being designed to accurately predict Global Horizontal Irradiance. However, some of the models are better at short time horizons, while others are more accurate for medium and long horizons. The aim of this research is to automatically combine the predictions of four different models (Smart Persistence, Satellite, Cloud Index Advection and Diffusion, and Solar Weather Research and Forecasting) by means of a state-of-the-art machine learning method (Extreme Gradient Boosting). With this purpose, the four models are used as inputs to the machine learning model, so that the output is an improved Global Irradiance forecast. A 2-year dataset of predictions and measures at one radiometric station in Seville has been gathered to validate the method proposed. Three approaches are studied: a general model, a model for each horizon, and models for groups of horizons. Experimental results show that the machine learning combination of predictors is, on average, more accurate than the predictors themselves.The authors are supported by the Spanish Ministry of Economy and Competitiveness, projects ENE2014-56126-C2-1-R and ENE2014-56126-C2-2-R and FEDER funds. Some of the authors are also funded by the Junta de Andalucía (research group TEP-220)

Effect of Amidated Low-Methoxyl Pectin on Physicochemical Characteristics of Jumbo Squid (Dosidicus gigas) Mantle Muscle Gels

Proteini mišića Humboldtove lignje (Dosidicus gigas) imaju ograničenu primjenu u želatiniranim proizvodima zbog slabe funkcionalnosti. Svrha je ovoga rada bila ispitati utjecaj dodatka prirodnog, komercijalno dostupnog vlakna, i to amidiranog pektina s malim udjelom metoksila (0,5; 1,0; 1,5; 2,0 i 3,0 %), na fizikalno-kemijska i funkcionalna svojstva gelova dobivenih od plašta Humboldtove lignje (Dosidicus gigas). Dodatkom 0,5 % vlakana opažen je trenutni učinak na teksturu gela, i to na poboljšanje tvdoće (p<0,05) od (3,4±0,7) N u kontrolnom uzorku (bez dodatka vlakana) do (5,2±0,9) N, te elastičnosti (p≥0,05). Posmična sila bila je značajna samo pri dodatku 3,0 % vlakana. Dodatak vlakana također je poboljšao sposobnost vezivanja vode (p<0,05), i to sa 75 % u kontrolnom uzorku na 90-95 % na kraju pokusa. Dodatak od 3,0 % vlakana utjecao je na bjelinu. Diferencijalnom su motridbenom kalorimetrijom pronađena dva endotermna prijelaza u gelovima. Dodatak vlakana povećao je drugi pik (aktin) (p<0,05) za 1-2 ºC. Stoga je zaključeno da ispitivanje potvrđuje da je amidirani pektin s malim udjelom metoksila odličan dodatak za poboljšanje funkcionalnosti proteina mišića Humboldtove lignje, jer pozitivno utječe na teksturu dobivenih gelova i njihovu sposobnost zadržavanja vode.Jumbo squid (Dosidicus gigas) muscle proteins show low functionality with limited use in gel products. This work aims to assess the influence of adding the natural and commercially available fibre, amidated low-methoxyl pectin (at 0.5, 1.0, 1.5, 2.0 and 3.0 %), on the physicochemical and functional characteristics of jumbo squid (Dosidicus gigas) mantle muscle gels. The addition of 0.5 % fibre showed an immediate effect on the gel texture profile analysis, improving hardness (p<0.05) from (3.4±0.7) N of the control (no added fibre) to (5.2±0.9) N, and increasing elasticity (p≥0.05). Shear force was significant only at 3.0 % fibre addition. Water holding capacity also improved (p<0.05) with fibre addition (from 75 % in the control to 90–95 % aft er the treatments). Whiteness was affected (p<0.05) when 3.0 % fibre was added. Differential scanning calorimetry showed two endothermic transition peaks in the gels. The second peak (actin) increased (p<0.05) by 1–2 °C with fibre addition. Therefore, the present study demonstrates that amidated low-methoxyl pectin (0.5–3.0 %) is an excellent ingredient to improve jumbo squid mantle muscle protein functionality, increasing the gel texture and water retention characteristics

Growth and nutrient absorption of Cape Gooseberry (Physalis Peruviana L.) in soilless culture

"This is an Author's Accepted Manuscript of an article published in [include the complete citation information for the final version of the article as published in the Journal of Plant Nutrition 2015 March, available online at: http://www.tandfonline.com/10.1080/01904167.2014.934474."Cape gooseberry (Physalis peruviana L.) is a solanaceous plant. The growth and time-course of nutrient accumulation of the plant and its partitioning between roots, stems, leaves, and fruits were examined. The study was conducted analyzing two nutrient solutions in soilless culture under greenhouse conditions during two consecutive seasons. The macronutrient contents were analyzed. On average, the yield was 8.9 t.ha(-1). Growth of the plant until 90 d after transplanting obeys an exponential function of time and the relative growth rate for this period was determined. Nitrogen (N) was the element that showed the highest concentration, corresponding to leaves (4.67%), followed by potassium (K) in stems (4.46%). The highest accumulations of N, phosphorous (P), calcium (Ca), and magnesium (Mg) were found in leaves and of K in the stems. Potassium showed the highest nutrient accumulation (29 g.plant(-1)) and the highest specific uptake rate.Torres Rubio, JF.; Pascual Seva, N.; San Bautista Primo, A.; Pascual España, B.; López Galarza, SV.; Alagarda Pardo, J.; Maroto Borrego, JV. (2015). Growth and nutrient absorption of Cape Gooseberry (Physalis Peruviana L.) in soilless culture. Journal of Plant Nutrition. 38(4):485-496. doi:10.1080/01904167.2014.934474S485496384Bellaloui, N., & Brown, P. H. (1998). Plant and Soil, 198(2), 153-158. doi:10.1023/a:1004343031242Bennett, J. P., Oshima, R. J., & Lippert, L. F. (1979). Effects of ozone on injury and dry matter partitioning in pepper plants. Environmental and Experimental Botany, 19(1), 33-39. doi:10.1016/0098-8472(79)90022-4CAUSTON, D. R. (1991). Plant Growth Analysis: The Variability of Relative Growth Rate Within a Sample. Annals of Botany, 67(2), 137-144. doi:10.1093/oxfordjournals.aob.a088112Convenio MAG-IICA (Ministerio de Agricultura y Ganadería. Institución Interamericana de Cooperación para la Agricultura). 2001. The cape gooseberry (Physalis peruvianaL.Physalis edulis). Subprograma de Cooperación Técnica, Ecuador. Available at: http://www.sica.gov.ec/agronegocios/Biblioteca/Convenio%20MAG%20IICA/productos/uvilla_mag.pdf (Accessed July 2007, in Spanish).El-Tohamy, W. A., El-Abagy, H. M., Abou-Hussein, S. D., & Gruda, N. (2009). Response of Cape gooseberry (Physalis peruviana L.) to nitrogen application under sandy soil conditions. Gesunde Pflanzen, 61(3-4), 123-127. doi:10.1007/s10343-009-0211-0Fresquet, J., Pascual, B., López-Galarza, S., Bautista, S., Baixauli, C., Gisbert, J. M., & Maroto, J. V. (2001). Nutrient uptake of pepino plants in soilless cultivation. The Journal of Horticultural Science and Biotechnology, 76(3), 338-343. doi:10.1080/14620316.2001.11511373Heuvelink, E., Bakker, M. J., Elings, A., Kaarsemaker, R. C., & Marcelis, L. F. M. (2005). EFFECT OF LEAF AREA ON TOMATO YIELD. Acta Horticulturae, (691), 43-50. doi:10.17660/actahortic.2005.691.2Leskovar, D. I., & Cantliffe, D. J. (1993). Comparison of Plant Establishment Method, Transplant, or Direct Seeding on Growth and Yield of Bell Pepper. Journal of the American Society for Horticultural Science, 118(1), 17-22. doi:10.21273/jashs.118.1.17Marcelis, L. F. M. (1993). Fruit growth and biomass allocation to the fruits in cucumber. 1. Effect of fruit load and temperature. Scientia Horticulturae, 54(2), 107-121. doi:10.1016/0304-4238(93)90059-yPuente, L. A., Pinto-Muñoz, C. A., Castro, E. S., & Cortés, M. (2011). Physalis peruviana Linnaeus, the multiple properties of a highly functional fruit: A review. Food Research International, 44(7), 1733-1740. doi:10.1016/j.foodres.2010.09.034Radford, P. J. (1967). Growth Analysis Formulae - Their Use and Abuse1. Crop Science, 7(3), 171. doi:10.2135/cropsci1967.0011183x000700030001xRamadan, M. F., & Moersel, J. T. (2007). Impact of enzymatic treatment on chemical composition, physicochemical properties and radical scavenging activity of goldenberry (Physalis peruviana L.) juice. Journal of the Science of Food and Agriculture, 87(3), 452-460. doi:10.1002/jsfa.2728Ramadan, M. F., & Moersel, J.-T. (2009). Oil extractability from enzymatically treated goldenberry (Physalis peruvianaL.) pomace: range of operational variables. International Journal of Food Science & Technology, 44(3), 435-444. doi:10.1111/j.1365-2621.2006.01511.xSalazar, M. R., Jones, J. W., Chaves, B., & Cooman, A. (2008). A model for the potential production and dry matter distribution of Cape gooseberry (Physalis peruviana L.). Scientia Horticulturae, 115(2), 142-148. doi:10.1016/j.scienta.2007.08.015Scholberg, J., McNeal, B. L., Jones, J. W., Boote, K. J., Stanley, C. D., & Obreza, T. A. (2000). Growth and Canopy Characteristics of Field-Grown Tomato. Agronomy Journal, 92(1), 152. doi:10.2134/agronj2000.921152xTrinchero, G. D., Sozzi, G. O., Cerri, A. M., Vilella, F., & Fraschina, A. A. (1999). Ripening-related changes in ethylene production, respiration rate and cell-wall enzyme activity in goldenberry (Physalis peruviana L.), a solanaceous species. Postharvest Biology and Technology, 16(2), 139-145. doi:10.1016/s0925-5214(99)00011-3Turner, A. (1994). Dry Matter Assimilation and Partitioning in Pepper Cultivars Differing in Susceptibility to Stress-induced Bud and Flower Abscission. Annals of Botany, 73(6), 617-622. doi:10.1006/anbo.1994.1077WILLIAMS, R. F. (1946). The Physiology of Plant Growth with Special Reference to the Concept of Net Assimilation Rate. Annals of Botany, 10(1), 41-72. doi:10.1093/oxfordjournals.aob.a083119Zapata, J.L., A. Saldarriaga, M. Londoño, and C. Díaz. 2002. Cape gooseberry Management in Colombia. Antioquia, Colombia: Rionegro, Programa Nacional de Transferencia de Tecnología Agropecuaria - Corpoica Regional Cuatro (in Spanish).Zerihun, A. (2000). Compensatory Roles of Nitrogen Uptake and Photosynthetic N-use Efficiency in Determining Plant Growth Response to Elevated CO2: Evaluation Using a Functional Balance Model. Annals of Botany, 86(4), 723-730. doi:10.1006/anbo.2000.123

RD50-MPW: a series of monolithic High Voltage CMOS pixel chips with high granularity and towards high radiation tolerance

Abstract A series of monolithic High Voltage CMOS (HV-CMOS) pixel sensor prototypes have been developed by the CERN-RD50 CMOS working group for potential use in future high luminosity experiments. The aim is to further improve the performance of HV-CMOS sensors, especially in terms of pixel granularity, timing resolution and radiation tolerance. The evaluation of one of this series, RD50-MPW3, is presented in this contribution, including laboratory and test beam measurements. The design of the latest prototype, RD50-MPW4, which resolves issues found in RD50-MPW3 and implements further improvements, is described. </jats:p