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RISS 인기검색어
- 검색키워드
- 저자 : Juan Serrano (검색결과 5 건)
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The Colombia Peace Referendum : The Participation of Victims Organizations in the Santander Region
Juan Pablo Serrano Frattali 미래사회통합연구센터 2018 Journal of Conflict and Integration Vol.2 No.2
The Colombia Peace Agreement Referendum is one of the most important subjects in the study of peace. Here, we try to approach the particular phenomenon of voting against the Final Agreement to end the Armed Conflict and Build a Stable and Lasting Peace in Colombia; at regional level, and more specifically we focus on Santander. This study attempts to explain the social reality, and investigates the perspective of social movements in the construction of peace in the region as well as the distortion between what was promulgated in Bogota and what was actually perceived in other regions. Consequently, this paper aims to gain a better understanding on the perception of the victims before the Colombian Peace Agreement Plebiscite.
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Control of peak floor accelerations of buildings under wind loads using tuned mass damper
Juan Acosta,Edén Bojórquez,Juan Bojórquez,Alfredo Reyes-Salazar,Omar Payán,Manuel Barraza,Juan Serrano 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.81 No.1
Due to the frequency and magnitude of some loads produced by gusts of turbulent wind, building floors can develop lateral displacements and significant accelerations which can produce strong inertial forces on structural, non-structural elements and occupants. A device that can help to reduce the floor accelerations is the well-known Tuned Mass Damper (TMD); however, nowadays there is no enough information about its capacity in order to dissipate energy of turbulent wind loads. For this reason, in this paper different buildings with and without TMD are modeled and dynamically analyzed under simulated wind loads in order to study the reduction of peak floor accelerations. The results indicate that peak floor accelerations can be reduced up to 40% when TMD are incorporated in the buildings, which demonstrated that the Tuned Mass Damper is an efficient device to reduce the wind effects on tall buildings.
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The Effect of Polymer Grafting in the Dispersibility of Alumina/Polysulfone Nanocomposites
Amaia Llorente,Berna Serrano,Juan Baselga 한국고분자학회 2017 Macromolecular Research Vol.25 No.1
γ-Alumina nanoparticles have been modified with polysulfone (PSU) chains via 1,3-dipolar cycloaddition reaction between functionalized alumina with vinyl groups and terminal azide polysulfone chains of two different molecular weights. Homopolymer nanocomposites have been prepared for the first time by extrusion and microinjection. The effectiveness of the grafts on the dispersiblity has been analyzed in terms of the parameters that govern the wettability between grafted and matrix chains: graft density (σ), graft molecular weight (N) at constant matrix molecular weight (P). The dispersion state and interfacial adhesion of PSU grafted-nanoparticles have been evaluated from laser scanning confocal, FESEM and SEM microscopy. Results show that the incorporation of the modified g-alumina improves the dispersion state in comparison with bare alumina nanoparticles, reducing the average particle size from 5±9 to 1.3±1 microns. Although aggregates are still present the size of the aggregates are also substantially reduced even with low or moderate graft density used in this work, but further improves the interfacial adhesion between nanoparticle and matrix when long PSU chains are grafted even with low-moderate grafting density. These results can be explained by enthalpic compatibility between polysulfone grafted layer and host polysulfone matrix
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Gonzalo Gurrea,Vicente Blanca-Giménez,Vicente Pérez,María-Antonia Serrano,Juan-Carlos Moreno,Solar Radiation Group of the Universitat Politècnica de València 한국기상학회 2018 Asia-Pacific Journal of Atmospheric Sciences Vol.54 No.4
The goal of this study was to statistically analyse the variability of global irradiance and ultraviolet erythemal (UVER) irradiance and their interrelationships with global and UVER irradiance, global clearness indices and ozone. A prediction of short-term UVER solar irradiance values was also obtained. Extreme values of UVER irradiance were included in the data set, as well as a time series of ultraviolet irradiance variability (UIV). The study period was from 2005 to 2014 and approximately 250,000 readings were taken at 5-min intervals. The effect of the clearness indices on global irradiance variability (GIV) and UIV was also recorded and bi-dimensional distributions were used to gather information on the two measured variables. With regard to daily GIVand UIV, it is also shown that for global clearness index (kt) values lower than 0.6 both global and UVER irradiance had greater variability and that UIVon cloud-free days (kt higher than 0.65) exceeds GIV. To study the dependence between UIVand GIV the χ2 statistical method was used. It can be concluded that there is a 95% probability of a clear dependency between the variabilities.A connection between high kt (corresponding to cloudless days) and low variabilities was found in the analysis of bidimensional distributions. Extreme values of UVER irradiance were also analyzed and it was possible to calculate the probable future values of UVER irradiance by extrapolating the values of the adjustment curve obtained from the Gumbel distribution.
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Grafting improves salinity tolerance of bell pepper plants during greenhouse production
Blanca E. Orosco-Alcalá,Héctor G. Núñez-Palenius,Fidel Díaz-Serrano,Luis Pérez-Moreno,Mauricio Valencia-Posadas,Libia I. Trejo-Tellez,Nicacio Cruz-Huerta,Juan I. Valiente-Banuet 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.6
Biotic and abiotic stresses aff ect plant growth and productivity. High-salinity stress aff ects crop yield, causing fi nancialloss to growers. The use of salt-tolerant rootstocks is a strategy that has been used to reduce salt damage in crops. A studywas conducted to evaluate the eff ect of salinity-resistant rootstocks on the physiological and morphological characteristicsof bell pepper plants grown under greenhouse conditions. A factorial experiment was conducted using a completely randomizeddesign with two factors. The bell pepper ‘Viper’ cultivar was grafted on two reported salinity-tolerant rootstocks(E21R10144 and E21R10197), and non-grafted (NG) plants were used as the control. Four salinity levels were applied tothe plants (electrical conductivity treatments using NaCl of 2, 4, 6, and 8 dS m −1 ) in Steiner nutritive solution (100%). Theresponse to salinity was determined using morphological and physiological plant parameters, including fruit yield. Increasedtolerance to salinity conditions (NaCl) was observed in the ‘Viper’ bell pepper grafted on E21R10144, which allowed greaterplant height, stem diameter, leaf size, as well as fresh and dry biomass of both the roots and canopy. The impacts on plantphysiological response, including photosynthesis, stomatal conductance, transpiration, water content, stomatal density, andfoliar area, were also determined. Our results indicate that the use of the salinity-tolerant bell pepper rootstock E21R10144maintained plant homeostasis and minimized the damage caused by salts to the morphology and physiology, as well as eff ectson fruit yield; thus, it is a promising tool for the management of salt stress.
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