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293 results on '"Acuña, Luis"'

10. Mycorrhizas and Ecological Restoration in South America

Author

Silva-Flores, Patricia, Neves, Maria Alice, Weidlich, Emanuela W. A., Fajardo, Laurie, Acuña, Luis, Aguilera, Paula, Marín, César, Godoy, Roberto, Duarte, Milen, Cabrera, Antonio, Santelices, Rómulo, Gupta, Vijai Kumar, Series Editor, Tuohy, Maria G., Series Editor, Lugo, Mónica A., editor, and Pagano, Marcela C., editor

Published
2022
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21. Discovering Fails in Software Projects Planning Based on Linguistic Summaries

Author

Pérez Pupo, Iliana, Piñero Pérez, Pedro Y., García Vacacela, Roberto, Bello, Rafael, Acuña, Luis Alvarado, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Bello, Rafael, editor, Miao, Duoqian, editor, Falcon, Rafael, editor, Nakata, Michinori, editor, Rosete, Alejandro, editor, and Ciucci, Davide, editor

Published
2020
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22. Linguistic Summaries Generation with Hybridization Method Based on Rough and Fuzzy Sets

Author

Pérez Pupo, Iliana, Piñero Pérez, Pedro Y., Bello, Rafael, Acuña, Luis Alvarado, García Vacacela, Roberto, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Bello, Rafael, editor, Miao, Duoqian, editor, Falcon, Rafael, editor, Nakata, Michinori, editor, Rosete, Alejandro, editor, and Ciucci, Davide, editor

Published
2020
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33. Síntesis de productos químicos derivados de la biomasa empleando catálisis heterogénea: heterociclos de la biomasa

Author

José Jobanny Martínez Zambrano, Hugo Alfonso Rojas Sarmiento, Jairo Cubillos Lobo, Edna Ximena Aguilera Palacios, David Fernando Silva Pinzón, Oscar Hernando Pardo Cuervo, Mónica Liliana Becerra Jiménez, Sandra Patricia Chaparro Acuña, Luis Alexander Páez Guevara, Gustavo Pablo Romanelli and José Jobanny Martínez Zambrano, Hugo Alfonso Rojas Sarmiento, Jairo Cubillos Lobo, Edna Ximena Aguilera Palacios, David Fernando Silva Pinzón, Oscar Hernando Pardo Cuervo, Mónica Liliana Becerra Jiménez, Sandra Patricia Chaparro Acuña, Luis Alexander Páez Guevara, Gustavo Pablo Romanelli

Published
2020

35. The Use of Waste Tyre Rubber Recycled Products in Lightweight Timber Frame Systems as Acoustic Insulation: A Comparative Analysis of Acoustic Performance.

Author

Balmori, José-Antonio, Casado-Sanz, Milagros, Machimbarrena, María, Quirós-Alpera, Susana, Mostaza, Roberto, and Acuña, Luis

Subjects
RUBBER waste, RUBBER, WASTE products as building materials, RUBBER goods, SYNTHETIC sporting surfaces, TRANSMISSION of sound, TIMBER
Abstract

The current European standards demand more energy-efficient, comfortable, and sustainable buildings and encourage the incorporation of recycled materials in building construction. Timber buildings are successfully competing with traditional building materials in addressing these challenges; however, one of the weaknesses of timber systems is their limited sound insulation capacity. One material that can fit into the sustainability aims of timber construction and improve its acoustic performance is recycled ground tyre rubber (GTR), which, on top of this, is a serious environmental problem. This paper presents research on the use of GTR materials combined with timber systems in order to improve their acoustic performance. Three different types of GTR products (granulate, rolls, and sheets) of different thicknesses and densities are selected and are combined with different sound-absorbing materials (mineral wool, cellulose, and wood fibre) inside a lightweight timber sandwich system. In this study, the first qualitative approach, the acoustic performance of the different resulting systems is compared based on the sound pressure level difference measured in a custom-made reduced-size transmission chamber. Secondly, the sound reduction index of four selected specimens is measured in an accredited sound transmission laboratory. The results show that, for all the lightweight timber systems included in this research, introducing a GTR layer improves the acoustic performance of the system. [ABSTRACT FROM AUTHOR]

Published
2024
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43. Comparison of coronary arteries morphometry and distribution in bovines with humans and other animal species.

Author

Gómez-Torres, Fabián A., Cortés-Machado, Luz S., and Ballesteros-Acuña, Luis E.

Subjects
ANIMAL species, CORONARY arteries, MORPHOMETRICS, ARTERIAL occlusions, BOS
Abstract

Background: The left coronary artery (LCA) in the bovines is more developed than the right. Aim: The objective of the study is to describe the bovine coronary system from a morphological point of view, including the morphometry and its distribution. Methods: Arciform suture with 2.0 silk was applied around the sinus orifice and coronary ostium and a number 14 catheter was installed, to perfuse semi-synthetic polyester resin, consisting of a mixture of 85% GP40L palatal with 15% styrene with red color mineral. Results: The average weight of 28 bovine hearts used in our study was 1.534.1 kg. The right coronary artery had a proximal caliber of 5 +/- 0.9 mm. The LCA caliber and length were 9.4 +/- 1.2 and 18.3 +/- 4.8 mm, respectively. This artery was divided into two branches in 85.7% of the cases and trifurcated in 14.3%. The paraconal interventricular branch (PIB) ended more frequently in the apex (46.4%), and its proximal caliber was 6.4 +/- 1.4 mm. The left circumflex branch ended in 82.1% in the subsinusal interventricular sulcus, and its proximal caliber was 5.9 +/- 1.2 mm. The proximal calibers of the PIB and the left circumflex branch did not present statistically significant differences (p = 0.137). The sinoatrial branch presented a dual origin (right and LCA) in 46.4% of the cases and a single origin from the LCA in 53.6% of the samples. In the evaluated hearts, left coronary dominance was observed in most cases (96.4%). Their presence of anastomosis between the branches of the coronary arteries was observed in 57.1% of cases. Conclusion: The presence of a myocardial bridge was found in six hearts (21.4%). In bovines, a high percentage of anastomosis was found, a protective factor in obstruction of the coronary arterial branches. [ABSTRACT FROM AUTHOR]

Published
2023
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48. Native Arbuscular Mycorrhizal Fungi Improved Araucaria araucanaGrowth over Commercial Inoculum Under Greenhouse and Field Conditions

Author

Godoy, Roberto, Acuña, Luis, Silva-Flores, Patricia, Aguilera, Paula, and Marín, César

Abstract

Araucaria araucanaforests in the Coastal Mountain range of Chile are highly endangered due to their population isolation, wildfires, and land-use change. Mycorrhizas constitute a potential restoration tool for this species. Firstly, in a greenhouse we tested A. araucanagrowth responses to single/mixed commercial and native arbuscular mycorrhizal fungi (AMF) inoculum. Secondly, in plantations under contrasting tree covers we compared the growth responses of greenhouse-grown A. araucanaseedlings with and without native AMF inoculum. Four treatments were established under greenhouse conditions (25 A. araucanaseedlings per treatment): T0, non-mycorrhizal control; T1, single AMF species commercial inoculum; T2, four AMF species commercial inoculum; and T3, 17 AMF species native inoculum. Seedlings were grown for 1.5 years, after which, seven growth traits and the Ritchie plant quality index were recorded. After this, in Nahuelbuta National Park (native inoculum and seeds’ site), a total of 80 seedlings were sown for 13 months: 40 from T0 and 40 from T3, in two contrasting plots regarding their tree mycorrhizal dominance (ectomycorrhizal vs. arbuscular mycorrhizal). Under greenhouse conditions, native AMF inoculum, over one and four species’ commercial inoculum, increased A. araucanaseedlings’ fresh and dry weight of shoots and roots. In situ, the sympatric combination of native seedlings and AMF inoculum growing under original soil conditions, resulted in higher plant growth and quality. Functional complementarity among AMF species probably explains our greenhouse results, as inoculum complexity is a good predictor of plant performance. Local adaptation of AMF and seedlings to soil biotic/abiotic conditions might explain our plantation results.

Published
2023
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