Mejora de los flujos logísticos en una empresa del sector Gran Distribución para referencias de alta rotación

Uno de los principales objetivos del departamento de logística de una compañía del sector de la distribución comercial es garantizar la presencia de los productos en los diferentes puntos de venta al menor coste posible. En este sentido, el presente proyecto expone la reducción de costes lograda derivados de las diferentes operaciones que se realizan, tanto en los almacenes como en los puntos de venta, en una empresa de este sector: Grupo Caprabo S.A.. A tal efecto, se ha utilizado la siguiente metodología: • En primer lugar, se realiza un análisis de la situación inicial del flujo logístico, tanto en lo que se refiere al flujo físico de los productos (en los almacenes y puntos de venta) como al flujo de información. En base a este estudio, se identifica la problemática relacionada con la gestión de los artículos de mayor rotación (o volumen movido) y se plantean diferentes opciones de mejora, analizando sus principales ventajas y desventajas. • A partir del estudio de estas opciones, se presentan las dos soluciones que se adaptan mejor a las necesidades y características de la empresa: - Implantación, en almacén y tienda, de una nueva unidad de manipulación: el medio palet. - Análisis, diseño e implantación de un nuevo flujo físico de los productos en almacén (o flujo tenso). Finalmente, en la última parte del proyecto se expone un análisis detallado de la viabilidad económica de las soluciones planteadas, con unos resultados que muestran la rentabilidad de este proyecto. Además, se presenta un pequeño análisis de sensibilidad ante posibles cambios futuros en el número de artículos presentes en el nuevo formato (medio palet). La elaboración de este proyecto fue posible gracias a un convenio de colaboración universidad-empresa, mediante el cual el autor tuvo la posibilidad de trabajar en el departamento de Supply Chain de la compañía Grupo Caprabo S.A

Knowledge and specialised trades in the late antique West: medicine vs engineering

The high degree of specialisation achieved in the Roman world covered a vast area of trades and reached beyond economy and production into specialised knowledge and science, but in the transition to the Middle Ages large parts of this knowledge were lost. The continuity and end of some specialised trades which were common in the early Empire but which were rare (or disappeared) in late Antiquity can be seen through the material and written record. In this paper, we aim to explain the divergent evolution of two such professions (medics and engineers) in the western provinces, adding more examples and further case-studies to current debates. Whereas medics and medicine continued as a profession, in part through the protection of the Church, specialised engineers and architects (which were usually linked to state training and employment) seem to have disappeared, together with the state structures that supported them

La transmisión impresa de un manuscrito dramático censurado: el caso de " El santo negro ", " El negro del Serafín " o " El negro del mejor amo "

El ms. 17.317 de la Biblioteca Nacional de España recoge una pieza dramática que ha sido atribuida a diferentes autores de nuestro teatro del Siglo de Oro y que ha sido titulada de distintas maneras a lo largo de su peripecia editorial. En este manuscrito se dice que es El negro del Serafín y que su dramaturgo es Luis Vélez de Guevara. La transmisión más famosa y de la que parten la mayor parte de los testimonios que conocemos corresponde a la que se imprime en la parte cuarta de la colección Nuevas Escogidas. En esta se atribuye la pieza a Mira de Amescua y se titula El negro del mejor amo. A partir de la censura que es realizada en el manuscrito se detalla la relación que tienen uno y otro testimonio.The comedy of ms. 17.317 from BNE has been attributed to various theater authors of the Spanish Golden Age. It has also been called in different ways throughout its publishing history. In this manuscript is named El negro del Serafín and attributed to Luis Vélez de Guevara. The most famous and repeated transmission is included in Parte Cuarta of Nuevas Escogidas. In this volume is attributed to Mira de Amescua and is titled El negro del mejor amo. This article discusses the censorship of the manuscript to establish relations between the two testimonies

The behaviour of diborane-reduced fulvic acids in flash pyrolysis

7 pages, 3 figures, 1 table, 25 references.-- Publicado en el capítulo: Session 1: Isolation, Fractionation, and Characterization.-- Humic Substances in the Aquatic and Terrestrial Environment, Proceedings of an International Symposium, celebrado del 21-23, agosto, 1989 en Linköping, Suecia.-- Este volumen 33, referido en la Citación, consta de 514 páginas, 150 figuras y 57 tablas.It is suggested that the striking structural changes introduced in humic substances by reduction with diborane may be useful in studying the role of carboxyl groups in the behaviour of these substances in flash pyrolysis. In the preliminary results shown in this communication, pyrograms of two fulvic acids of different origins and the corresponding diborane reduced substances are compared. It was found that the diborane reduction was responsible for both qualitative and quantitative changes in the pyrolytic patterns of the fulvic acids. These patterns feflect the changes in the reactivity and structural stability of the fulvic materials caused by the disappearance of the carboxyl groups.Peer reviewe

Fulvic acids from particulate matter of a water-logged peatland

6 pages, 3 figures, 2 tables, 29 references.The presence of aggregates of humic substances (HS) with inorganic adsorbates in a lagoon located in Huelva (south Spain) is reported. The chemical nature of the fulvic acid (FA) fraction, extracted from the natural aggregate by treatment with chelating resins, has been investigated by physical and chemical methods. The results suggest that these FA are similar to FA from other aquatic environments. As revealed by FT-IR and NMR spectroscopies and mild oxidation with potassium persulfate, the FA contain predominantly in their structure polysaccharides and components derived from lignin.Peer Reviewe

Performance comparison of large-area SiPM arrays suitable for gamma ray detectors

[EN] The use of photosensors of the type Silicon Photomultpliers (SiPM) has widely been extended in recent years for multiple applications in both research and industry. However, there is a lack of comparative studies of different SiPMs under the same conditions, making it difficult to choose the most appropriate one for a specific application. SiPM arrays are suitable for gamma rays detectors, especially when covering large active areas. They are used either in clinical or pre-clinical scenarios, constituting Single-Photon Emission Computed Tomography (SPECT) and Positron Emission Tomography (PET) scanners, or just gamma cameras. The current work presents, for the first time, a comparative study between SensL, Hamamatsu Photonics and KETEK arrays of 12 x 12 SiPMs, with individual active areas of 3 mm x 3 mm, thus covering a total active area of about 5 cm x 5 cm. In this study, we have first evaluated their bias and temperature dependencies, resulting in a very similar behaviour with just a slightly larger dependency of the tested Hamamatsu parts. We also report the performance of detector blocks based on these three SiPM arrays, when coupled to pixelated crystal arrays and monolithic scintillators, in terms of photon impact estimation accuracy, as well as energy resolution. In the case of the monolithic crystals, also the depth of interaction resolution was determined. Both monolithic and pixelated blocks are nowadays widely used in academia or are commercially available for molecular imaging systems. The results obtained for the three SiPM arrays when using those crystals, are comparable, without observing any significant different among them.This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No 695536). It has also been supported by the Spanish Ministerio de Economia, Industria y Competitividad under Grant TEC2016-79884-C2-1-R.Gonzalez-Montoro, A.; González Martínez, AJ. (2019). Performance comparison of large-area SiPM arrays suitable for gamma ray detectors. Biomedical Physics & Engineering Express. 5(4):1-10. https://doi.org/10.1088/2057-1976/ab0f6eS11054Henseler, D., Grazioso, R., Nan Zhang, & Schmand, M. (2009). SiPM performance in PET applications: An experimental and theoretical analysis. 2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC). doi:10.1109/nssmic.2009.5402157Buzhan, P., Dolgoshein, B., Filatov, L., Ilyin, A., Kantzerov, V., Kaplin, V., … Smirnov, S. (2003). Silicon photomultiplier and its possible applications. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 504(1-3), 48-52. doi:10.1016/s0168-9002(03)00749-6Dolgoshein, B., Balagura, V., Buzhan, P., Danilov, M., Filatov, L., Garutti, E., … Tikhomirov, I. (2006). Status report on silicon photomultiplier development and its applications. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 563(2), 368-376. doi:10.1016/j.nima.2006.02.193Berard, P., Couture, M., Deschamps, P., Laforce, F., & Dautet, H. (2011). Performance measurement for a new low dark count UV-SiPM. 2011 IEEE Nuclear Science Symposium Conference Record. doi:10.1109/nssmic.2011.6154109Moliner, L., González, A. J., Soriano, A., Sánchez, F., Correcher, C., Orero, A., … Benlloch, J. M. (2012). Design and evaluation of the MAMMI dedicated breast PET. Medical Physics, 39(9), 5393-5404. doi:10.1118/1.4742850Gonzalez, A. J., Aguilar, A., Conde, P., Hernandez, L., Moliner, L., Vidal, L. F., … Benlloch, J. M. (2016). A PET Design Based on SiPM and Monolithic LYSO Crystals: Performance Evaluation. IEEE Transactions on Nuclear Science, 63(5), 2471-2477. doi:10.1109/tns.2016.2522179Gonzalez-Montoro, A., Benlloch, J. M., Gonzalez, A. J., Aguilar, A., Canizares, G., Conde, P., … Sanchez, F. (2017). Performance Study of a Large Monolithic LYSO PET Detector With Accurate Photon DOI Using Retroreflector Layers. IEEE Transactions on Radiation and Plasma Medical Sciences, 1(3), 229-237. doi:10.1109/trpms.2017.2692819González-Montoro, A., Sánchez, F., Martí, R., Hernández, L., Aguilar, A., Barberá, J., … González, A. J. (2018). Detector block performance based on a monolithic LYSO crystal using a novel signal multiplexing method. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 912, 372-377. doi:10.1016/j.nima.2017.10.098Ronzhin, A., Albrow, M., Los, S., Martens, M., Murat, P., Ramberg, E., … Ritt, S. (2013). A SiPM-based TOF-PET detector with high speed digital DRS4 readout. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 703, 109-113. doi:10.1016/j.nima.2012.11.043Kim, C., McDaniel, D., Malaney, J., McBroom, G., Peterson, W., Tran, V. H., … Ganin, A. (2012). Time-of-flight PET-MR detector development with silicon photomultiplier. 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC). doi:10.1109/nssmic.2012.6551808Schaart, D. R., van Dam, H. T., Seifert, S., Vinke, R., Dendooven, P., Löhner, H., & Beekman, F. J. (2009). A novel, SiPM-array-based, monolithic scintillator detector for PET. Physics in Medicine and Biology, 54(11), 3501-3512. doi:10.1088/0031-9155/54/11/01

Hydrogen incorporation and crystallization of nanocrystalline silicon deposited by electron cyclotron resonance plasmas

The archival version of this work was published in J. Electrochem. Soc.146.5, (1999): 1966-1970.Nanocrystalline silicon layers have been deposited by electron cyclotron resonance chemical vapor deposition from silane as precursor. Although hydrogen was not deliberately introduced in the plasma it was incorporated in the grown layers as evidenced by the presence of a main infrared absorption band around 2100 cm21 with a shoulder at 2000 cm21. This suggests that most of the hydrogen is bonded to internal surfaces of microcavities instead of isolated Si–H bonds. In the first few hundreds, ,500 Å, of deposited layers, the estimated hydrogen concentration is rather low, below 5 atom %, and increases strongly for larger thicknesses. Solid phase crystallization at ,11008C occurs in thin layers close to the substrates in which the hydrogen concentration is below a certain critical value of ,5 atom

Descripción de un recurso virtual para la enseñanza de la estadística en Educación Primaria

En este trabajo se pretende mostrar la validez de un recurso virtual para el trabajo de la mediana en la educación primaria, para ello se hará una búsqueda por la red, seleccionando un recurso y se hará una descripción de este. Para asegurarnos de poder utilizar este recurso para la enseñanza en educación primaria se comparará con otros recursos similares.Universidad de Granada. Facultad de Ciencias de la Educación. Grado en Educación Primari

Análisis de la satisfacción laboral percibida por los trabajadores pertenecientes al sector deportivo: una revisión sistemática

The aim of this research was to carry out a systematic review of the existing scientific information on job satisfaction as perceived by workers or professionals in sports organisations. This systematic review followed the considerations established by Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). The present systematic review included published research papers whose subject matter was related to the job satisfaction of the worker or professional in the field of sport and especially in municipal sports services. After an initial papers analysis of 168 articles, we excluded those that did not meet the inclusion criteria (n = 147); thereby, we obtained the final selection of 18 articles. The results of this study seem to indicate that the job satisfaction of workers or professionals in sports organisations is fairly moderate and that there may also be differences depending on gender, type of work and the sector (public or private) to which they belong. Furthermore, the results analysed in this systematic review show that there is no uniformity in the evaluation systems for measuring workers' job satisfaction.El objetivo de esta investigación fue realizar una revisión sistemática sobre de la información científica existente referente a la satisfacción laboral percibida por el trabajador o profesional de entidades deportivas. La presente revisión sistemática siguió las consideraciones establecidas por Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). En la presente revisión sistemática se incluyeron los estudios publicados cuya temática estuviera relacionada con la satisfacción laboral del trabajador o profesional en el ámbito deportivo y especialmente en los servicios deportivos municipales. Tras un primer análisis de trabajos donde se identificaron 168 artículos, se excluyeron aquellos que no cumplieran los criterios de inclusión (n = 147) y así, se obtuvo la selección definitiva de 18 artículos. Los resultados de este estudio parecen indicar que la satisfacción laboral de los trabajadores o profesionales de entidades deportivas en su mayoría es moderada, y que además pueden existir diferencias en función del sexo, del tipo de trabajo y del sector (público o privado) al que pertenezcan. Por otro lado, de los resultados analizados en la presente revisión sistemática se desprende que no existe uniformidad en los sistemas de evaluación para medir la satisfacción laboral de los trabajadores.&nbsp