Estudios estructurales sobre entidades tiosemicarbazonacobre(II) y su interacción con polioxometalatos y biomoléculas. Síntesis, estabilidad y propiedades magnéticas

Estudios estructurales sobre entidades tiosemicarbazonacobre(II) y su interacción con polioxometalatos y biomoléculas. Síntesis, estabilidad y propiedades magnéticas” El presente Trabajo ahonda en la síntesis y caracterización de nuevos derivados de Cu(II) con los ligandos 2–piridinacarbaldehído tiosemicarbazona (HL) y 2–piridinacarbaldehído N4–metiltiosemicarbazona (HLM). En ellos, las entidades tiosemicarbazonacobre(II) se enlazan a iones inorgánicos sencillos (cloruro, perclorato, sulfato y hexafluorurosilicato), polioxometalatos (aniones hexamolibdato, octamolibdato y decavanadato entre otros) y biomoléculas (tioles celulares, nucleobases y nucleótidos). Su estudio químico y estructural ha permitido establecer ciertas relaciones que ayudan a comprender mejor algunas de sus propiedades espectroscópicas y magnéticas, así como su actividad biológica. Finalmente, se proporcionan evidencias estructurales para ciertos tipos de roturas del ligando tiosemicarbazona, que ayudan a conocer mejor en qué condiciones estas especies son estables en disolución y en cuáles tienen lugar diversos procesos de descomposición

Vibration analysis of the fruit detachment process in late-season ‘Valencia’ orange with canopy shaker technology

The mechanical harvesting of juice oranges can be achieved by the application of forced vibration to the tree canopy to detach fruit. Among the available harvesting technologies, canopy shaker systems have the advantage of working continuously, with rods that penetrate the tree canopy generating low-frequency, high-amplitude movement. The objective of this work is to analyse the fruit detachment process in order to improve the design and management of canopy shaker systems, reducing the risk of damage to fruit during the mechanical harvesting process. Three different canopy shaker systems were used to remove oranges in a well-adapted intensive orchard during the harvesting period. The fruit detachment process was recorded with a triaxial accelerometer sensor with a datalogger inserted into each tested fruit. Fruit movement displayed a similar frequency value as harvester rods (4.1-4.9 Hz), while the resultant acceleration depended on the interaction of the tree-machine system (38.8-60.4 m s-2). The fruit detachment event occurrence required a vibration time ranging between 1.45-5.75 s, which can limit the machine’s maximum speed. After the detachment event, fruit presented a short mean time (0.28 s) with no interaction with other fruit, branch or machine. The interaction of fruit during the harvesting process was more important, in terms of maximum acceleration, after the detachment event (527.6 m s-2) than before (401.0 m s-2). The use of a catch frame to collect fruit and of padding material in the machinery are fundamental measures to reduce the damage caused to fruit with canopy shaker technologie

Fruit abscission pattern of ‘Valencia’ orange with canopy shaker system

Fruit detachment can occur due to natural causes or be mechanically performed by a combination of mechanical stresses that cause tissue breakage in the plant. Forced abscission should not coincide with natural abscission zones (AZ). Abscission zones are very important in citrus harvesting both in terms of the destination market and of the possible damage caused to the tree or fruit. The objective of this study is to determine the abscission pattern of sweet oranges with a canopy shaker and compare it with other detachment systems. Five plots of Valencia oranges were tested during the 2017 and 2018 harvesting seasons, using a commercial tractor-drawn canopy shaker. The diameter, weight and breakage type were evaluated in the cases of natural fall, snap method, mechanical harvesting with canopy shaker, and pull test. Breakage type AZ-C predominated in natural fall (89.0%) and the snap method (79.5%). Similarly, AZ-A predominated for the canopy shaker (58.8%) and pull test (45.3%). Mechanical action on the fruit produced peel tear by breaking the flavedo, which reached highest frequency in the snap method (7.6%). Peel tear breakage required a mean fruit detachment force value of 99.3 N, higher than the average abscission values for AZ-C (88.7 N) and AZ-A (66.6 N). The fruit that remained on the tree after canopy shaker harvesting showed lower mean values of fruit detachment force (16.3%) than the pre-harvest fruit. The frequency of fruit with calyx with the canopy shaker and snap methods was similar, with a mean value of 36%

CONSTRUCCIÓN DEL PLANO DE ENTORNOS DE TRABAJO CERRADOS UTILIZANDO EL ROBOT KOALA

Resumen En el presente trabajo de investigación se analizó, diseñó e implementó un control vía software adaptado específicamente para un robot móvil de ruedas (RMR): el robot Koala de la empresa K-Team, el cual sirvió como plataforma experimental para manipular –inicialmente- e incrementar posteriormente de forma paulatina y definitiva la autonomía del robot.El software de control inicia con el análisis y documentación de la estructura física y lógica del Koala, su comportamiento, capacidades y limitantes. Se analizó la cinemática del RMR, propiedades de componentes y dispositivos de comunicación como sensores y puertos. En la etapa de diseño, se trabajó con la información alimentada del exterior por el robot, estructurando la misma en: las decisiones, reconocimiento del entorno (obstáculos, espacios), estrategias de referencia, ubicación y desplazamiento, tiempos y movimientos entre otros, que dieron forma en gran medida al control y autonomía del robot. Se implementó en lenguaje C/C++ Borland.Palabras clave: Robots móviles, trayectorias, cinemático, sensores. CONSTRUCTION OF THE PLAN OF CLOSED WORK ENVIRONMENTS USING THE KOALA ROBOT Abstract In the folllowing research it was analyzed, designed and implemented a control by software specifically adapted to a movil robot of wheels (RMR): the Koala robot of the K-Team enterprice, which was utilized as experimental platform to manipulate -to beginning- and eventually increase of a paulatine form the robot autonomy.The control software starts with the analize and documentation of physical structure and logical of the Koala, it behaviour, capacities and limitations. It was analized the RMR kinematics, properties of components and comunication devices such as ports and sensors. In the design stage, it was worked with the obtained information of outdoors by the robot, structuring the same in: the decisions, recognition of the environment (obstacles, outdoors), referency strategies, location and displacement, times and movements between others,that made it possible mainly to the control and robot autonomy. It was implemented through C/C## Borland language.Keywords: Mobile robots, Paths, Kinematics, Sensors

Olive Crown Porosity Measurement Based on Radiation Transmittance: An Assessment of Pruning Effect

Crown porosity influences radiation interception, air movement through the fruit orchard, spray penetration, and harvesting operation in fruit crops. The aim of the present study was to develop an accurate and reliable methodology based on transmitted radiation measurements to assess the porosity of traditional olive trees under different pruning treatments. Transmitted radiation was employed as an indirect method to measure crown porosity in two olive orchards of the Picual and Hojiblanca cultivars. Additionally, three different pruning treatments were considered to determine if the pruning system influences crown porosity. This study evaluated the accuracy and repeatability of four algorithms in measuring crown porosity under different solar zenith angles. From a 14 to 30 solar zenith angle, the selected algorithm produced an absolute error of less than 5% and a repeatability higher than 0.9. The described method and selected algorithm proved satisfactory in field results, making it possible to measure crown porosity at different solar zenith angles. However, pruning fresh weight did not show any relationship with crown porosity due to the great differences between removed branches. A robust and accurate algorithm was selected for crown porosity measurements in traditional olive trees, making it possible to discern between different pruning treatments

Recomendador inteligente de vestimenta

En la actualidad más que nunca, una imagen vale más que mil palabras. Esto coincide con una sociedad que cada vez valora más su tiempo y donde desde hace pocas décadas existe un auge de los grandes gigantes de moda, con millones de personas que quieren estar siempre atentos a las últimas tendencias. Este trabajo ha consistido en el desarrollo de una aplicación web que combina todo esto, ayudándonos a mejorar nuestra imagen, adecuándose siempre a cada evento y circunstancia, pero sin perder la esencia personal. Esta aplicación aprenderá de tus gustos y los ajustará a tu agenda, haciendo de esta aplicación una experiencia personal muy satisfactoria. Para ello, se tendrá en cuenta el fondo de armario del usuario, y analizando diversos factores como la meteorología de ese día, los eventos anotados en su agenda y la formalidad requerida, sus preferencias. . . se le dará un look acorde a todo ello. Así mismo, la app podrá hacer recomendaciones de looks que se asemejen a la tendencia de todos los usuarios de la aplicación en ese momento, utilizando prendas lo más parecidas de su armario. Una vez escogido el look, la aplicación aprenderá acerca de su elección

Cetylpyridinium chloride promotes disaggregation of SARS-CoV-2 virus-like particles

BACKGROUND: SARS-CoV-2 is continuously disseminating worldwide. The development of strategies to break transmission is mandatory. AIM OF THE STUDY: To investigate the potential of cetylpyridinium chloride (CPC) as a viral inhibitor. METHODS: SARS-CoV-2 Virus Like-Particles (VLPs) were incubated with CPC, a potent surfactant routinely included in mouthwash preparations. RESULTS: Concentrations of 0.05% CPC (w/v) commonly used in mouthwash preparations are sufficient to promote the rupture of SARS-CoV-2 VLP membranes. CONCLUSION: Including CPC in mouthwashes could be a prophylactic strategy to keep SARS-CoV-2 from spreading

Hardware transactional memory with software-defined conflicts

In this paper we propose conflict-defined blocks, a programming language construct that allows programmers to change the concept of conflict from one transaction to another, or even throughout the course of the same transaction. Defining conflicts in software makes possible the removal of dependencies which, though not necessary for the correct execution of the transactions, arise as a result of the coarse synchronization style encouraged by TM. Programmers take advantage of their knowledge about the problem and specify through confict-defined blocks what types of dependencies are superfluous in a certain part of the transaction, in order to extract more performance out of coarse-grained transactions without having to write minimally synchronized code. Our experiments with several transactional benchmarks reveal that using software-defined conflicts, the programmer achieves significant reductions in the number of aborted transactions and improve scalability.Peer ReviewedPostprint (author's final draft

The Impact of Non-coherent Buffers on Lazy Hardware Transactional Memory Systems

Abstract When supported in silicon, transactional memory (TM

Development of a puncture electronic device for electrical conductivity measurements throughout meat salting

Conductivity measurements of food systems are of high interest because they are related with food characteristics such as free water and salt content. Nevertheless, as far as now no devices have been developed for punctual conductivity measurements inside solid foods. The aim of this work was to develop a conductimeter which allows obtaining punctual measurements in different locations of solid foods. The sensor consists of a coaxial needle while an electrical sign controlled by microcontroller is applied. The preliminary results indicate that the obtained response is proportional to the conductivity and the salt content in the zone of measurement of the food, being possible its use for salted food analysis and control