Phenology, pollen synchronization and fruit characteristics of european hazelnut (Corylus avellana L.) cv. tonda de Giffoni in three sites of central Chile

Phenology, pollen synchronization and fruit characteristics were studied during the season 2011-2012 for European hazelnut (Corylus avellana L.) cv. "Tonda di Giffoni" and three of its pollinizers ("Tonda Romana", "Tonda Gentile delle Langhe" and "Barcelona") in three agro-ecological conditions of central Chile. Male and female blooms occurred from June through August, with a flowering span ranging between two to two and a half months depending on the cultivar, pollinizer and study sites. "Tonda di Giffoni" male flowering onset occurred during the first week of June, up to two weeks earlier than female flowers (271 to 417 chilling hours) showing a marked protandrus dichogamy. "Tonda Gentile delle Langhe" and "Barcelona" pollinizers completely covered the female flowering period of "Tonda di Giffoni", while "Tonda Romana" fail to cover the first flowering week. In general, starting dates for the different phenological stages were directly and significantly (P<0.05) correlated with chilling hour accumulation and growing degree days. Fruit set (34.1%) and maximum fruit diameter (16.6 mm) were significantly lower in the case of "Tonda Gentile delle Langhe" compared to "Tonda Romana" (82.2%, 17.3 mm) and "Barcelona" (74.7%, 17.4 mm).Phenology, pollen synchronization and fruit characteristics were studied during the season 2011-2012 for European hazelnut (Corylus avellana L.) cv. "Tonda di Giffoni" and three of its pollinizers ("Tonda Romana", "Tonda Gentile delle Langhe" and "Barcelona") in three agro-ecological conditions of central Chile. Male and female blooms occurred from June through August, with a flowering span ranging between two to two and a half months depending on the cultivar, pollinizer and study sites. "Tonda di Giffoni" male flowering onset occurred during the first week of June, up to two weeks earlier than female flowers (271 to 417 chilling hours) showing a marked protandrus dichogamy. "Tonda Gentile delle Langhe" and "Barcelona" pollinizers completely covered the female flowering period of "Tonda di Giffoni", while "Tonda Romana" fail to cover the first flowering week. In general, starting dates for the different phenological stages were directly and significantly (P<0.05) correlated with chilling hour accumulation and growing degree days. Fruit set (34.1%) and maximum fruit diameter (16.6 mm) were significantly lower in the case of "Tonda Gentile delle Langhe" compared to "Tonda Romana" (82.2%, 17.3 mm) and "Barcelona" (74.7%, 17.4 mm)

Relación entre la altura del salto vertical y la capacidad de recuperación posterior a un protocolo de esfuerzo y recuperación física

Tesis (Profesor de Educación Física para la Enseñanza Básica, Licenciado en Educación)Objetivo: El objetivo de este estudio es determinar si existe alguna correlación significativa entre las variables altura del salto contramovimiento con brazos (Abalakov) y el porcentaje de pérdida de este. Metodología: Se apeló a interpretaciones de datos, que involucran principalmente la altura de diversos saltos y el nivel de recuperación presentado, al correlacionar estas dos variables se valoró el grado de relación. Se midió a la población la cual comprendió un total de 154 jugadores de basquetbol pertenecientes al club Universidad Católica, de los cuales la muestra estuvo compuesta por un total de 58 jugadores de las categorías sub-13, sub-15 y sub-17 respectivamente. Por lo tanto, nuestra muestra corresponde a una no probabilística o dirigida. Los datos presentados fueron procesados a través del software IBM SPSS y Excel, con la finalidad de determinar la existencia o no de relaciones, comparaciones y descripciones entre las variables de la investigación. Resultados: Se obtuvo una correlación negativa débil, por lo que se acepta la hipótesis nula de trabajo, indicando que no hay una correlación en la altura del salto vertical y la recuperación posterior a un estímulo fatigante y un minuto en la posición decúbito supino con pies en altura

Assessment of Web Panel Zone in Built-up Box Columns Subjected to Bidirectional Cyclic Loads

The behavior of the web panel zone has a direct effect on the cyclic performance of steel moment connections. While the mechanisms of web panel zone failure are known under cyclic load, little is known about the behavior of the web panel zone under bidirectional loads in bolted connections. Using experimental tests and calibrated numerical models, this research evaluated the web panel zone behavior under unidirectional and bidirectional cyclic loads. The results showed that bidirectional load can modify the stress and strain distribution in the web panel zone. Moreover, the increasing of the width-to-thickness ratio of the column influences the failure mechanism of the joint configuration and increases the plastic incursion in the column. These data demonstrate that bidirectional effects improve the web panel zone performance under cyclic loads

Numerical Study on Seismic Response of Steel Storage Racks with Roller Type Isolator

This research evaluates the effectiveness of using a roller-type base isolation device with tensile strength in reducing the dynamic response of industrial steel storage racks. These were subjected to a seismic input acting separately in both directions of the structure. The seismic record obtained from the earthquake that occurred in Llolleo, Chile, on 3 March 1985, was used as input. This earthquake was scaled in the frequency domain, adjusting its response spectrum to coincide with the design spectrum required by NCh2745. In the calculations of this spectrum, the most hazardous seismic zone (zone 3) and soft soil (soil III) that amplifies the effect of the low frequencies of the earthquake were considered. These frequencies are the ones that have the most affect on flexible structures such as high racks and systems with base isolation. Numerical time-history analyses were performed in fixed base racks and base isolation racks. In both cases, the models include semi-rigid connections with capacity for plastic deformation and energy dissipation. Parametric analyses were carried out considering the most relevant variables, using an algorithm programmed in MATLAB software. The maximum relative displacement, maximum basal shear load, and maximum absolute floor acceleration were considered as responses of interest. The results showed the effectiveness of using the base isolation device by reducing the absolute accelerations between approximately 75% and 90%, compared to the same fixed rack at its base. This makes it possible to reduce the vulnerability of the stored load to overturn under the action of a severe earthquake

Numerical Study on Seismic Response of Steel Storage Racks with Roller Type Isolator

This research evaluates the effectiveness of using a roller-type base isolation device with tensile strength in reducing the dynamic response of industrial steel storage racks. These were subjected to a seismic input acting separately in both directions of the structure. The seismic record obtained from the earthquake that occurred in Llolleo, Chile, on 3 March 1985, was used as input. This earthquake was scaled in the frequency domain, adjusting its response spectrum to coincide with the design spectrum required by NCh2745. In the calculations of this spectrum, the most hazardous seismic zone (zone 3) and soft soil (soil III) that amplifies the effect of the low frequencies of the earthquake were considered. These frequencies are the ones that have the most affect on flexible structures such as high racks and systems with base isolation. Numerical time-history analyses were performed in fixed base racks and base isolation racks. In both cases, the models include semi-rigid connections with capacity for plastic deformation and energy dissipation. Parametric analyses were carried out considering the most relevant variables, using an algorithm programmed in MATLAB software. The maximum relative displacement, maximum basal shear load, and maximum absolute floor acceleration were considered as responses of interest. The results showed the effectiveness of using the base isolation device by reducing the absolute accelerations between approximately 75% and 90%, compared to the same fixed rack at its base. This makes it possible to reduce the vulnerability of the stored load to overturn under the action of a severe earthquake

Industrial bioelectrochemistry for waste valorization : State of the art and challenges

Bioelectrochemistry has gained importance in recent years for some of its applications on waste valorization, such as wastewater treatment and carbon dioxide conversion, among others. The aim of this review is to provide an updated overview of the applications of bioelectrochemical systems (BESs) for waste valorization in the industry, identifying current limitations and future perspectives of this technology. BESs are classified according to biorefinery concepts into three different categories: (i) waste to power, (ii) waste to fuel and (iii) waste to chemicals. The main issues related to the scalability of bioelectrochemical systems are discussed, such as electrode construction, the addition of redox mediators and the design parameters of the cells. Among the existing BESs, microbial fuel cells (MFCs) and microbial electrolysis cells (MECs) stand out as the more advanced technologies in terms of implementation and R&D investment. However, there has been little transfer of such achievements to enzymatic electrochemical systems. It is necessary that enzymatic systems learn from the knowledge reached with MFC and MEC to accelerate their development to achieve competitiveness in the short term

Influence of Global Slenderness and Sliding Pallets on Seismic Design of Steel Storage Racks: A Sensitivity Analysis

In this research, the influence of global slenderness and sliding pallets factor on the seismic design of steel storage racks are assessed. Variations in span length, the height of storage levels, live load, and percentage of live load considered in the seismic mass are studied for different levels of seismic zone and soil type. The models were designed according to the Chilean Code NCh2369. Subsequently, a global sensitivity analysis was developed to analyze the influence of each studied parameter in the seismic design response in terms of fundamental period, drift, and base shear from a response spectral analysis approach. A total of 12000 simulations were performed. Two-hundred additional models were performed to evaluate the variation of seismic mass in the structural response. Results indicate a significant influence of live loads and seismic mass on steel racks designed for soft soils and unbrace conditions. The stiffness also modifies the performance of the racks, mainly in models using braces in the down-aisle direction and cross-aisle direction. In these cases, the seismic mass factor does not have a strong influence on structural response in comparison to the global slenderness

Influence of Global Slenderness and Sliding Pallets on Seismic Design of Steel Storage Racks: A Sensitivity Analysis

In this research, the influence of global slenderness and sliding pallets factor on the seismic design of steel storage racks are assessed. Variations in span length, the height of storage levels, live load, and percentage of live load considered in the seismic mass are studied for different levels of seismic zone and soil type. The models were designed according to the Chilean Code NCh2369. Subsequently, a global sensitivity analysis was developed to analyze the influence of each studied parameter in the seismic design response in terms of fundamental period, drift, and base shear from a response spectral analysis approach. A total of 12000 simulations were performed. Two-hundred additional models were performed to evaluate the variation of seismic mass in the structural response. Results indicate a significant influence of live loads and seismic mass on steel racks designed for soft soils and unbrace conditions. The stiffness also modifies the performance of the racks, mainly in models using braces in the down-aisle direction and cross-aisle direction. In these cases, the seismic mass factor does not have a strong influence on structural response in comparison to the global slenderness

Relationship of counter-movement jump and speed tests (10-30 m) and agility in young Chilean soccer players

El objetivo de la presente investigación fue determinar la relación que existe entre el salto contramovimiento y pruebas de velocidad (10-30 m) y agilidad. La muestra estuvo constituida por 169 futbolistas jóvenes entre las categorías sub- 13 y sub-19, a los cuales se les aplicó la prueba de salto contramovimiento, velocidad (10-30 m) y agilidad zigzag. Los resultados muestran que la altura del salto contramovimiento presenta una alta correlación negativa con la velocidad 10 m (r=-.693), 30 m (r=-.731) y agilidad (r=-.490). De igual modo, los resultados de la potencia del salto contramovimiento se correlacionan negativamente con la velocidad 10 m (r=-.658), 30 m (r=-.719) y agilidad (r=-.484). Los coeficientes de determinación más altos correspondieron a la altura del salto contramovimiento y velocidad (r2=.534) y la potencia del salto contramovimiento y velocidad (r2=.517). Los resultados obtenidos en el presente estudio sugieren que el salto contramovimiento tiene un alto grado de influencia en el rendimiento en la velocidad (10-30 m), lo cual, parece no estar tan claro en la variable de agilidad.The objective of this research was to determine the relationship between countermovement jumping and speed tests (10-30 m) and agility. The sample consisted of 169 young soccer players between the under-13 and under-19 categories, to whom the counter-movement jump test, speed (10-30 m) and zigzag agility were applied. The results show that the height of the countermovement jump shows a high negative correlation with speed 10 m (r = -. 693), 30 m (r = -. 731) and agility (r = -. 490). Similarly, the results of the countermovement jump power are negatively correlated with speed 10 m (r = -. 658), 30 m (r = -. 719) and agility (r = -. 484). The highest coefficients of determination corresponded to the height of the countermovement jump and speed (r2 = .534) and the power of the countermovement jump and speed (r2 = .517). The results obtained in the present study suggest that the countermovement jump has a high degree of influence on speed performance (10-30 m), which seems to be not so clear in the agility variable

Relación del salto contramovimiento y pruebas de velocidad (10-30 m) y agilidad en jóvenes futbolistas chilenos

The objective of this research was to determine the relationship between countermovement jumping and speed tests (10-30 m) and agility. The sample consisted of 169 young soccer players between the under-13 and under-19 categories, to whom the counter-movement jump test, speed (10-30 m) and zigzag agility were applied. The results show that the height of the countermovement jump shows a high negative correlation with speed 10 m (r = -. 693), 30 m (r = -. 731) and agility (r = -. 490). Similarly, the results of the countermovement jump power are negatively correlated with speed 10 m (r = -. 658), 30 m (r = -. 719) and agility (r = -. 484). The highest coefficients of determination corresponded to the height of the countermovement jump and speed (r2 = .534) and the power of the countermovement jump and speed (r2 = .517). The results obtained in the present study suggest that the countermovement jump has a high degree of influence on speed performance (10-30 m), which seems to be not so clear in the agility variable.El objetivo de la presente investigación fue determinar la relación que existe entre el salto contramovimiento y pruebas de velocidad (10-30 m) y agilidad. La muestra estuvo constituida por 169 futbolistas jóvenes entre las categorías sub-13 y sub-19, a los cuales se les aplicó la prueba de salto contramovimiento, velocidad (10-30 m) y agilidad zigzag. Los resultados muestran que la altura del salto contramovimiento presenta una alta correlación negativa con la velocidad 10 m (r=-.693), 30 m (r=-.731) y agilidad (r=-.490). De igual modo, los resultados de la potencia del salto contramovimiento se correlacionan negativamente con la velocidad 10 m (r=-.658), 30 m (r=-.719) y agilidad (r=-.484). Los coeficientes de determinación más altos correspondieron a la altura del salto contramovimiento y velocidad (r2=.534) y la potencia del salto contramovimiento y velocidad (r2=.517). Los resultados obtenidos en el presente estudio sugieren que el salto contramovimiento tiene un alto grado de influencia en el rendimiento en la velocidad (10-30 m), lo cual, parece no estar tan claro en la variable de agilidad