Mejoramiento de las bodegas de materias primas y producto terminado de la empresa SAAFARTEX S.A.

El siguiente proyecto está enfocado para empresas, profesionales y estudiantes que deban consolidar procesos en una misma ubicación, requieran diseñar una distribución de la planta de una instalación y busquen el mejoramiento para el almacenamiento y manejo de grandes volúmenes de referencias -- El proyecto descrito a continuación nace de la necesidad de la empresa Saafartex S.A. de mejorar la distribución y el sistema de almacenamiento de las bodegas de materias primas y producto terminado -- Para lograr dicho objetivo se utilizaron herramientas propias de la carrera de Ingeniería de Producción como las decisiones de almacenamiento, decisiones estratégicas y diseño de Lay Out -- Igualmente se utilizaron principios estadísticos y de costos y presupuestos -- Como resultado final se incluyen los planos de distribución de las bodegas de materias primas y producto terminado; el listado de equipos y sistema de almacenamiento seleccionados con justificación; la evaluación del flujo de las bodegas y tiempos de desplazamiento con respecto la distribución física propuest

Influence of Adaptive Comfort Models in Execution Cost Improvements for Housing Thermal Environment in Concepción, Chile

Most of the operational energy needed by the housing sector is used to compensate energy losses or thermal gains through the building’s envelope. As a result, any improvement in the thermal behavior will provide important opportunities to reduce energy consumption. This research analyzes improvements in the thermal envelope in social housing in the Greater Concepción area in Chile using adaptive thermal comfort models and thermal insulation investments. The objective set out is to evaluate the economic reduction of thermal envelope improvement costs for dwellings, which entails using the adaptive thermal comfort model obtained through monitoring and the surveys applied to the users of social housing in Concepción (CAS), against the international adaptive thermal comfort models established by the EN 15251:2007 and ASHRAE 55-2017 standards. Finally, it is concluded that, on having applied the social housing adaptive thermal comfort model (CAS), execution costs are reduced by between 28.8% and 58.2%, reaching a time of comfort in free oscillation similar to that obtained from applying the models of the EN 15251:2007 (74.2%) and ASHRAE 55-2017 standards (59.9%)CONICYT FONDECYT 3160806VI PPIT-U

Working fluid selection for organic Rankine cycle power generation using hot produced supercritical CO2 from a geothermal reservoir

Geothermal heat mining simulations using supercritical CO2 (sCO2) were performed in this research. Working fluid selection criteria for power generation using sCO2 from a geothermal reservoir are then presented for subcritical, superheated and supercritical organic Rankine cycles (ORCs). Meanwhile, method of working fluid classification for ORC is proposed. To get the most feasible ORC design, this study introduces the concept of “turning point” for isentropic and dry working fluids, as well as minimum turbine inlet temperature for wet working fluids. A thermodynamic model was developed with capabilities to obtain the optimal working fluid mass flow rate, evaporation temperature, superheated temperature, and supercritical pressure, to evaluate the thermal performance of the three ORC approaches using hot produced sCO2. With this model, thirty potential working fluids with critical temperatures in the range from 50 to 225 °C were screened for utilizing hot produced sCO2 considering physical properties, environmental and safety impacts, and thermodynamic performances. Finally, the thermodynamic results were compared for all possible working fluids

The Role of Identification in Consumers' Evaluations of Brand Extensions

Brand extension is a widely adopted strategy for firms to take advantage of an existing brand's equity in a new product category. The main goal of this paper is to test the moderating role consumer-company identification plays in the effect of product fit and information on consumers' evaluations of brand extensions. Study 1 demonstrates the moderator effect of identification on the effect of category fit on consumers' purchase intentions for brand extensions and brand alliances. In Study 2, we proposed that identified consumers are not affected by information about the product, while low identified consumers rely more on that information. However, results show that the presence of information about the brand extension is only significant for identified consumers. For marketing managers, our results will help in decisions regarding extension category selection, segmentation strategy, and identification cuing

Influence of Adaptive Comfort Models on Energy Improvement for Housing in Cold Areas

The evaluation of construction standards using adaptive thermal comfort models has a great impact on energy consumption. The analysis of a user’s climate adaptation must be one of the first steps in the search for nearly/net Zero Energy Buildings (nZEB). The goal of this work is to analyze the standards recommended by the Chile’s Construction with Sustainability Criteria for the building of housing, applying the ASHRAE 55-2017 and EN 15251:2007 adaptive comfort models in social housing. The study produces concrete recommendations associated with construction strategies, to increase the number of hours the user finds themselves with acceptable thermal comfort levels, without repercussions for energy consumption. Sixteen parametric series were evaluated with a dynamic simulation of the most common prototype of social housing in the Bio-Bio Region. The study shows that thermal comfort conditions can be increased through a combination of improvement measures compared to the ECCS standard (Construction Standards with Sustainability Criteria): 27.52% in the case of applying EN 15251:2007 and 24.04% in the case of ASHRAE 55-2017

Selective Implantation of Diamines for Cooperative Catalysis in Isoreticular Heterometallic Titanium-Organic Frameworks

This is the peer reviewed version of the following article: Selective Implantation of Diamines for Cooperative Catalysis in Isoreticular Heterometallic Titanium-Organic Frameworks, which has been published in final form at https://doi.org/10.1002/anie.202100176. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.[EN] We introduce the first example of isoreticular titanium-organic frameworks, MUV-10 and MUV-12, to show how the different affinity of hard Ti(IV) and soft Ca(II) metal sites can be used to direct selective grafting of amines. This enables the combination of Lewis acid titanium centers and available -NH, sites in two sizeable pores for cooperative cycloaddition of CO2 to epoxides at room temperature and atmospheric pressure. The selective grafting of molecules to heterometallic clusters adds up to the pool of methodologies available for controlling the positioning and distribution of chemical functions in precise positions of the framework required for definitive control of pore chemistry.This work was supported by the EU (ERC Stg Chem-fs-MOF 714122) and Spanish Government (CTQ2017-83486-P, RTI2018-098568-A-I00 & CEX2019-000919-M). E.L.-M. and S.T. thanks the Spanish Government for their Juan de la Cierva Fellowship (FJCI-2017-32956) and Ramon y Cajal contract (RYC-2016-1981), respectively. A.R.G. acknowledges funding from Generalitat Valencia (ACIF/2020/090)and Fondo Social Europeo. N.M.P. thanks the European Union for a Marie Sklodowska-Curie Global Fellowship (H2020MSCA-IF-2016-GF-749359-EnanSET) and to the "2020 Postdoctoral Junior Leader-Retaining Fellowship, la Caixa Foundation (ID 100010434 and fellowship code LCF/BQ/PR20/11770014)". F.G.C. acknowledges the support of a fellowship from "la Caixa" Foundation (ID 100010434 and the fellowship code LCF/BQ/PI19/11690011). S.N. thanks financial support by the Ministerio de Ciencia, Innovacion y Universidades (RTI 2018-099482-A-I00 project), Fundacion Ramon Areces (XVIII Concurso Nacional para la Adjudicacion de Ayudas a la Investigacion en Ciencias de la Vida y de la Materia, 2016) and Agencia Valenciana de la Innovacion (AVI-GVA, Carboagua project, INNEST/2020/111).López-Maya, E.; Padial, NM.; Castells-Gil, J.; Ganivet, CR.; Rubio-Gaspar, A.; García Cirujano, F.; Almora-Barrios, N.... (2021). Selective Implantation of Diamines for Cooperative Catalysis in Isoreticular Heterometallic Titanium-Organic Frameworks. Angewandte Chemie International Edition. 60(21):11868-11873. https://doi.org/10.1002/anie.2021001761186811873602

Análisis cariológico de ocho especies de encinos (Quercus, Fagaceae) en México

Karyotype analyses of eight species of the Quercus genus were performed and are reported here. Five species (Q. candicans, Q. crassifolia, Q. elliptica, Q. hintonii and Q. urbanii) belong to the Lobatae section and three (Q. frutex, Q. obtusata and Q. rugosa) to the Quercus section. This is the first report of the chromosome numbers of all of them except Q. rugosa, and demonstrate that they are diploid (2n = 2x = 24) and the karyotypes are moderately asymmetrical.Se han realizado los estudios cariológicos de ocho especies del género Quercus, de las cuales cinco (Q. candicans, Q. crassifolia, Q. elliptica, Q. hintonii y Q. urbanii) pertenecen a la sección Lobatae y tres (Q. frutex, Q. obtusata y Q. rugosa) a la sección Quercus. Se indica por primera vez el número cromosómico de todas ellas excepto Q. rugosa. En todos los casos se trata de diploides (2n = 2x = 24) con cariotipos moderadamente asimétricos

OPTIMIZACIÓN ESTADÍSTICA DEL RENDIMIENTO TÉRMICO DE UN COLECTOR SOLAR DE PLACA PLANA UTILIZANDO DISEÑO DE EXPERIMENTOS CON UN ENFOQUE DE TAGUCHI

ResumenEn el presente trabajo se hace uso de los arreglos ortogonales propuestos por Taguchi para maximizar el rendimiento térmico de un colector solar de placa plana. En el proceso de optimización son considerados cuatro factores, los cuales son: ángulo de inclinación del colector, espaciamiento entre la placa absorbedora y la cubierta, espesor del aislamiento en la parte inferior del colector y el material del aislamiento en la parte inferior del colector. La metodología se aplica al diseño térmico de un colector solar de placa plana tomado de la literatura abierta, los resultados muestran que el ángulo de inclinación del colector, el espesor del aislamiento en la parte inferior del colector y el material del aislamiento en la parte inferior del colector son estadísticamente significativos para el cálculo del rendimiento térmico del colector y que a diferencia de los diseños de colectores encontrados en la literatura abierta debe tomarse en cuenta la transferencia de calor que se genera a través del aislante colocado en la parte inferior del colector, mientras que el espaciamiento entre la placa absorbedora y la cubierta no resulta ser significativa estadísticamente. Se obtiene un aumento del 7% en el rendimiento térmico del colector con respecto al diseño tomado de la literatura abierta.Palabra(s) Clave(s): ANOVA, Arreglos Ortogonales de Taguchi, Colector de Energía Solar, Optimización, Simulación. AbstractThis work makes use of orthogonal arrays proposed by Taguchi to maximize the thermal performance of a flat plate solar collector. On the process optimization are taken into account four control factors, which are: the collector tilt, spacing between the absorber plate and the cover, back insulation thickness and the material type of back insulation. The methodology is applied to a problem of thermal design of a flat plate solar collector taken from the open literature, the results show that the collector tilt, back insulation thickness and material type of back insulation are statistically significant for the calculus of the thermal performance of the collector, and that unlike of the designs of collectors found in the open literature, the heat transfer through of the back insulation must taken into account, while the spacing between the absorber plate and the cover is not statistically significant. A 7% increase in the thermal performance of the flat plate solar collector is obtained with respect to the design taken from the open literature.Keywords: ANOVA, Flat Plate Solar Collector, Optimization, Simulation, Taguchi´s Orthogonal Arrays

Avalanche Dynamics in Evolution, Growth, and Depinning Models

The dynamics of complex systems in nature often occurs in terms of punctuations, or avalanches, rather than following a smooth, gradual path. A comprehensive theory of avalanche dynamics in models of growth, interface depinning, and evolution is presented. Specifically, we include the Bak-Sneppen evolution model, the Sneppen interface depinning model, the Zaitsev flux creep model, invasion percolation, and several other depinning models into a unified treatment encompassing a large class of far from equilibrium processes. The formation of fractal structures, the appearance of $1/f$ noise, diffusion with anomalous Hurst exponents, Levy flights, and punctuated equilibria can all be related to the same underlying avalanche dynamics. This dynamics can be represented as a fractal in $d$ spatial plus one temporal dimension. We develop a scaling theory that relates many of the critical exponents in this broad category of extremal models, representing different universality classes, to two basic exponents characterizing the fractal attractor. The exact equations and the derived set of scaling relations are consistent with numerical simulations of the above mentioned models.Comment: 27 pages in revtex, no figures included. Figures or hard copy of the manuscript supplied on reques