Factores de reducción de resistencia para espectros de ductilidad acumulada constante en elementos de concreto reforzado

67 páginas. Maestría en Ingeniería Estructural.El trabajo que aquí se presenta se realizó en dos etapas de cálculo y una de revisión. En la primera etapa de cálculo se utilizaron acelerógramas sintéticos, a partir de los cuales se hicieron estudios preliminares con la finalidad de establecer la influencia de diversos parámetros en los factores de reducción de resistencia para espectros de ductilidad acumulada constante. Conforme lo indica la ecuación (2.25) dichos factores serán denotados RNE en esta tesis. En la segunda etapa de cálculo así como en la etapa de revisión, se emplearon dos familias de acelerógramas reales registrados en la Zona de Lago de Ciudad de México. Los estudios se limitan a acelerógramas de larga duración y banda angosta de frecuencias debido a que el problema asociado a las demandas acumuladas de deformación plástica es particular a este tipo excitaciones sísmicas

Overview of Second Chance Schools in the Province of Malaga (Spain): A case Study

The rate of early school leavers (ESL) in Andalusia is relatively high, reaching 21.8% in 2020. This will condition the employability of specific population sectors and, to some extent, other exclusionary dynamics. Second Chance Schools (E20) are proposed as an educational alternative for those who have dropped out of school early. In this paper, we will analyze the profile of E20 users in the Malaga province and their motivations and expectations. We found that the majority of the participants in the Second Chance School programs in the province of Malaga are Spanish women aged 16-22 years old and living in Malaga City. The average drop-out age is 16 years old, and the main reason is demotivation and disinterest (29.5%, followed by family reasons (25.3%). The primary motivation for returning to studies is "self-improvement." The level of satisfaction of the participants is relatively high and has a very positive effect on other areas of life

El Sol (1976-05-03)

Vol. 1, no. 2https://scholarworks.utrgv.edu/el_sol/1001/thumbnail.jp

El Sol (1977-08-24)

Vol.2, no.4https://scholarworks.utrgv.edu/el_sol/1007/thumbnail.jp

Effect on the demand and stock returns: cross-sectional of Big Data and time-series analysis

For reducing the degree of uncertainty caused by constant change in the environment, large, medium or small, private or public organizations must support their decisions in something more than experience or intuition; they must be supported by the development of accurate and reliable forecasts in order to meet the needs in the organization planning tasks. This case study presents a growing company dedicated to the storage of perishable products and incorporates time series forecasting techniques to estimate the volume of storage to foresee the requirements of additional facilities, personnel and materials needed for product mobility

Gelatin-methacryloyl hydrogels containing turnip mosaic virus for fabrication of nanostructured materials for tissue engineering

16 Pág.Current tissue engineering techniques frequently rely on hydrogels to support cell growth, as these materials strongly mimic the extracellular matrix. However, hydrogels often need ad hoc customization to generate specific tissue constructs. One popular strategy for hydrogel functionalization is to add nanoparticles to them. Here, we present a plant viral nanoparticle the turnip mosaic virus (TuMV), as a promising additive for gelatin methacryloyl (GelMA) hydrogels for the engineering of mammalian tissues. TuMV is a flexuous, elongated, tubular protein nanoparticle (700-750 nm long and 12-15 nm wide) and is incapable of infecting mammalian cells. These flexuous nanoparticles spontaneously form entangled nanomeshes in aqueous environments, and we hypothesized that this nanomesh structure could serve as a nanoscaffold for cells. Human fibroblasts loaded into GelMA-TuMV hydrogels exhibited similar metabolic activity to that of cells loaded in pristine GelMA hydrogels. However, cells cultured in GelMA-TuMV formed clusters and assumed an elongated morphology in contrast to the homogeneous and confluent cultures seen on GelMA surfaces, suggesting that the nanoscaffold material per se did not favor cell adhesion. We also covalently conjugated TuMV particles with epidermal growth factor (EGF) using a straightforward reaction scheme based on a Staudinger reaction. BJ cells cultured on the functionalized scaffolds increased their confluency by approximately 30% compared to growth with unconjugated EGF. We also provide examples of the use of GelMA-TuMV hydrogels in different biofabrication scenarios, include casting, flow-based-manufacture of filaments, and bioprinting. We envision TuMV as a versatile nanobiomaterial that can be useful for tissue engineering.EV-L, AIF-S, MJ-LZ, and JAT-N acknowledge funding from scholarships provided by CONACyT (Consejo Nacional de Ciencia y Tecnología, México). EV-L acknowledges the Nuevo Leon Institute for Innovation and Technology Transference for a PhD student grant (No. 459134, CVU 360539). GT-dS and MMA acknowledge the institutional funding received from Tecnológico de Monterrey (Grant 002EICIS01). MMA, GT-dS, and IG-G acknowledge funding provided by CONACyT (Consejo Nacional de Ciencia y Tecnología, México) through several grants (SNI 26048, SNI 256730, and SNI 313028). FP acknowledge the funding received from RTA 2015-00017 from INIA and EU Arimnet-2 Grant Agreement No. 618127. The CBGP was granted “Severo Ochoa” Distinctions of Excellence by the Spanish Ministry of Science and Innovation (SEV-2016-0672 and CEX 2020-000999-S)Peer reviewe

Rhizosphere-mediated effects of the invasive grass Bromus tectorum L. and native Elymus elymoides on nitrogen cycling in Great Basin Desert soils

Background and aims: There is evidence that the invasive grass Bromus tectorum can affect soil nitrogen (N) cycling, possibly leading to a positive plant-soil feedback. Rhizosphere priming of N mineralization could provide a mechanistic explanation for such a feedback. Methods: We conducted a greenhouse study to isolate rhizosphere effects on N cycling by the invasive annual grass, Bromus tectorum L., and the native perennial grass, Elymus elymoides (Raf.) Swezey, in invaded and uninvaded soils. We compared the rhizosphere priming effect (RPE) on N mineralization by species and the distribution of N in various pools by planting treatment and soil type. Results: B. tectorum had a negative RPE (−23 and −22 % in invaded and uninvaded soils, respectively), while E. elymoides had no significant RPE. B. tectorum was more competitive over E. elymoides in invaded compared to uninvaded soil. Conclusions: B. tectorum had a negative effect on soil N availability via root-mediated processes, even though its growth and competitiveness increased in invaded soils. Positive plant-soil feedback effects of B. tectorum may be mediated by aboveground inputs rather than belowground and/or depend on site-specific conditions