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  • Spanish; Castilian

  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Paulino Ruiz-Huanca;

    Predicción temprana, índice de déficit hídrico, índices de vegetación, rendimiento, Hordeum vulgare L.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ LAReferencia - Red F...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Leguia, Efrain; Locatelli, Bruno; Imbach, Pablo; Alpizar, Francisco; +2 Authors
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Agritroparrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Agritrop
    Article . 2007
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Agritroparrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Agritrop
      Article . 2007
      Data sources: Agritrop
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    Authors: Adriana Saldaña-Robles; S. Jöns; N. Saldaña-Robles; C. E. Damián-Ascencio;

    En el presente trabajo se desarrolló un modelo de predicción de rendimiento, empleando datos de, temperatura del aire, humedad del aire desde 1980 hasta el 2007 para el estado de Guanajuato. Para la predicción de rendimiento se utilizó una red neuronal artificial con una estructura del tipo feed-forward back propagación. Se realizaron pruebas con diferentes arquitecturas en la estructura de la red neuronal, el método de entrenamiento utilizado fue el algoritmo de Levenberg-Marquardt y el error fue evaluado con el MSE. Adicionalmente se alimentó la red neuronal con arreglos diferentes como elementos de entrada. El modelo fue validado con los datos del 2007. Los resultados muestran que los mejores elementos para predecir el rendimiento fueron: los arreglos de temperatura y humedad del aire, los cuales mostraron un MSE de 0.0036.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ LAReferencia - Red F...arrow_drop_down
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    Authors: Antonio Montes;

    electromicrogravimmetry, underpotential deposition, thallium, adsorption, chloride.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ LAReferencia - Red F...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Marcos Alberto CORONADO ORTEGA; Gisela MONTERO ALPÍREZ; Conrado GARCÍA GONZÁLEZ; Armando PÉREZ SÁNCHEZ; +1 Authors

    Baja California, México, se ubica en tercer lugar a nivel nacional con mayor superficie de trigo cultivada (13.5 %). Mexicali, capital de dicho estado, es el principal productor de trigo y representa el cultivo más importante de su valle, con una superficie cultivada en el periodo 2009-2010 de 87 724 ha. Esto conlleva a la generación de grandes cantidades de paja de trigo como residuo agrícola. Tradicionalmente el 85 % de este residuo es dispuesto mediante la quema in situ a cielo abierto con el objetivo de preparar la tierra para el próximo ciclo agrícola, el 15 % restante tiene diversas aplicaciones. Tal práctica repercute considerablemente en las emisiones de CO, material particulado (MP) y CH4 al ambiente, ocasionando un deterioro de la calidad del aire del Valle y ciudad de Mexicali, así como problemas en la salud de la población. Por otra parte, se desaprovecha la energía contenida en la paja de trigo, que es potencialmente útil como biocombustible y que en el año 2010 fue de 6.8 PJ. Se presenta un inventario de las emisiones generadas por las quemas de la paja de trigo realizadas in situ a cielo abierto, para el periodo 1987-2010. En los resultados destaca que las emisiones totales, considerando las quemas agrícolas progresivas en dirección del viento, pasaron de 25 370 t (1987) a 41 913 t (2010). Considerando las enormes cantidades tanto de energía desaprovechada, como de las emisiones provocadas por las quemas de paja, es recomendable evaluar la factibilidad técnica y económica para reconvertir tal biomasa residual y utilizarla como materia prima para la obtención de biocombustibles o directamente en procesos de generación eléctrica.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ LAReferencia - Red F...arrow_drop_down
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Figueroa, Olga Gómez; Laguardia, Naylet Sangroni; Castañeira, Jessie Arlene Pérez; Suárez, Yasniel Sánchez;

    Resumen La investigación de mercado es un tema actual que permite acercarse cada vez más a satisfacer las necesidades de los clientes. El artículo tiene como objetivo desarrollar una investigación comercial para conocer las preferencias de los clientes respecto al producto jabón tocador Lis. Para dar cumplimiento a tal objetivo se emplearon los métodos y técnicas siguientes: análisis de documentos, observación directa, tormenta de ideas, procedimiento de muestreo combinado, encuestas a clientes, matriz de importancia percepción, y herramientas informáticas como Microsoft Visio 2010, software estadístico SPSS y el EndNoteX7 para la gestión de las referencias bibliográficas. Entre los principales resultados se obtiene que las características del producto que mayor atención debe prestarle la empresa son: durabilidad, aroma y textura, para ello se propone que la entidad revise su sistema productivo y la fórmula del producto con el fin de mejorar las características mencionadas. Abstract Market research is a current topic that allows us to get closer and closer to satisfying the needs of customers. The objective of this paper is to develop a commercial investigation to find out the preferences of customers regarding the Lis toilet soap product. To fulfill this objective, the following methods and techniques were used: document analysis, direct observation, brainstorming, combined sampling procedure, customer surveys, perception importance matrix, and computer tools such as Microsoft Visio 2010, SPSS statistical software and EndNoteX7 for managing bibliographic references. Among the main results, it is obtained that the characteristics of the product that the company must pay the most attention are: durability, aroma and texture, for this it is proposed that the entity review its production system and the product formula in order to improve the aforementioned characteristics. Los autores declaran no presentar conflictos de intereses

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ ZENODOarrow_drop_down
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    ZENODO
    Article . 2021
    License: CC BY
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    ZENODO
    Article . 2021
    License: CC BY
    Data sources: Datacite
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    ZENODO
    Article . 2021
    License: CC BY
    Data sources: Datacite
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ ZENODOarrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      ZENODO
      Article . 2021
      License: CC BY
      Data sources: ZENODO
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      ZENODO
      Article . 2021
      License: CC BY
      Data sources: Datacite
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      ZENODO
      Article . 2021
      License: CC BY
      Data sources: Datacite
  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Gutberlet, Jutta;

    Os desafios que catadores e catadoras de materiais recicláveis enfrentam no seu dia a dia já são inúmeros e a introdução de tecnologias que queimam resíduos sólidos para captar energia significa outro fator que põe em risco a sobrevivência desta população. Seguindo a lógica da globalização econômica, grandes empresas multinacionais de saneamento ambiental estão entrando no mercado da gestão de resíduos sólidos nos países em desenvolvimento. Coleta, separação, transformação e venda de materiais recicláveis por grupos organizados de catadores geram trabalho e renda: trata-se de capital social e humano. Nos países da América Latina e da Ásia, em particular, milhares de pessoas dependem desse setor. Essa atividade oferece oportunidades para a inclusão social com resgate da cidadania. A implantação de incineradores significa uma ameaça a estes postos de trabalho, sem mencionar os problemas ambientais gerados pelos gases e cinzas tóxicas eliminados durante o processo da queima. A presente pesquisa-ação utiliza métodos participativos e analisa dados secundários, tendo como objetivos desconstruir a lógica tecnocrata de gestão de resíduos sólidos e apontar a importância do compromisso social e ambiental dos governantes e da sociedade com a coleta seletiva e a reciclagem, aumentando desta forma a sustentabilidade social, econômica e ecológica.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ LAReferencia - Red F...arrow_drop_down
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    Authors: Félix Sánchez de Jesús;

    Niquelado químico; Codepositación; Alúmina; Recubrimientos

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    Authors: Raquel Salazar Moreno; Pedro Cruz Meza; Abraham Rojano Aguilar;

    La producción bajo invernaderos es una de las ramas de la agricultura que más energía consume, el costo por concepto de consumo de energía en invernaderos varía entre 20-40% del costo total dependiendo del tipo de producción. En México existen diferentes niveles de tecnología distribuidos a lo largo del país, que van desde producción a campo abierto hasta invernaderos de alta tecnología con diversos sistemas de control climático. La producción de alta tecnología presenta rendimientos elevados con alta calidad con un uso óptimo de la tecnología en un esquema amigable con el ambiente. En este trabajo se presenta el análisis energético a detalle en la producción de jitomate para dos invernaderos, uno localizado en Baja California y el otro en Puebla, que se utiliza para dos ciclos de producción durante el año. El primer invernadero no requiere de un sistema de calefacción, debido a que se utiliza para un ciclo de producción. En el segundo invernadero, cuenta con un sistema de calefacción, dado que se utiliza durante todo el año. La productividad energética fue de 2.43 kg MJ-1 y 0.4 kg MJ-1 y el uso de energía por m2 se estimó en 5.14 MJ m-2 y 1085 MJ m-2 para el invernadero sin y con calefacción (Valle de Mexicali y Puebla) respectivamente. Los resultados muestran que es indispensable incrementar la eficiencia en el uso de la energía en los sistemas de calefacción, utilizando otras opciones existentes en el mercado, así como el evitar pérdidas de calor durante la noche.

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    Authors: Salvador Jara Guerrero; Juan Torres Melgoza;

    Vivimos en la era del conocimiento, disfrutando sus logros y temiendo sus riesgos. Y a pesar de la enorme cantidad de información científica generada cada día, en nuestra sociedad el analfabetismo científico es alarmante: basta con observar el incremento en la difusión de pseudociencias, sectas y charlatanerías que buscan manipular a las poblaciones mundiales aprovechando su ignorancia científica. En el fondo de esta paradoja está la incapacidad de la población para evaluar y distinguir entre un conocimiento científico y la charlatanería, entre la potencialidad de la ciencia y sus riesgos. La última oportunidad escolar de quienes no estudian ciencias para aprender y analizar los temas científicos de manera crítica es la preparatoria; por ello este trabajo explora las concepciones que de la ciencia y los científicos tienen los estudiantes de ese nivel. Los resultados muestran una ambivalencia en las opiniones estudiantiles, que puede ser el reflejo de su incapacidad para distinguir un conocimiento de una mera opinión o de una mentira.

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Paulino Ruiz-Huanca;

    Predicción temprana, índice de déficit hídrico, índices de vegetación, rendimiento, Hordeum vulgare L.

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    Authors: Leguia, Efrain; Locatelli, Bruno; Imbach, Pablo; Alpizar, Francisco; +2 Authors
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    Agritrop
    Article . 2007
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      Article . 2007
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    Authors: Adriana Saldaña-Robles; S. Jöns; N. Saldaña-Robles; C. E. Damián-Ascencio;

    En el presente trabajo se desarrolló un modelo de predicción de rendimiento, empleando datos de, temperatura del aire, humedad del aire desde 1980 hasta el 2007 para el estado de Guanajuato. Para la predicción de rendimiento se utilizó una red neuronal artificial con una estructura del tipo feed-forward back propagación. Se realizaron pruebas con diferentes arquitecturas en la estructura de la red neuronal, el método de entrenamiento utilizado fue el algoritmo de Levenberg-Marquardt y el error fue evaluado con el MSE. Adicionalmente se alimentó la red neuronal con arreglos diferentes como elementos de entrada. El modelo fue validado con los datos del 2007. Los resultados muestran que los mejores elementos para predecir el rendimiento fueron: los arreglos de temperatura y humedad del aire, los cuales mostraron un MSE de 0.0036.

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    Authors: Antonio Montes;

    electromicrogravimmetry, underpotential deposition, thallium, adsorption, chloride.

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    Authors: Marcos Alberto CORONADO ORTEGA; Gisela MONTERO ALPÍREZ; Conrado GARCÍA GONZÁLEZ; Armando PÉREZ SÁNCHEZ; +1 Authors

    Baja California, México, se ubica en tercer lugar a nivel nacional con mayor superficie de trigo cultivada (13.5 %). Mexicali, capital de dicho estado, es el principal productor de trigo y representa el cultivo más importante de su valle, con una superficie cultivada en el periodo 2009-2010 de 87 724 ha. Esto conlleva a la generación de grandes cantidades de paja de trigo como residuo agrícola. Tradicionalmente el 85 % de este residuo es dispuesto mediante la quema in situ a cielo abierto con el objetivo de preparar la tierra para el próximo ciclo agrícola, el 15 % restante tiene diversas aplicaciones. Tal práctica repercute considerablemente en las emisiones de CO, material particulado (MP) y CH4 al ambiente, ocasionando un deterioro de la calidad del aire del Valle y ciudad de Mexicali, así como problemas en la salud de la población. Por otra parte, se desaprovecha la energía contenida en la paja de trigo, que es potencialmente útil como biocombustible y que en el año 2010 fue de 6.8 PJ. Se presenta un inventario de las emisiones generadas por las quemas de la paja de trigo realizadas in situ a cielo abierto, para el periodo 1987-2010. En los resultados destaca que las emisiones totales, considerando las quemas agrícolas progresivas en dirección del viento, pasaron de 25 370 t (1987) a 41 913 t (2010). Considerando las enormes cantidades tanto de energía desaprovechada, como de las emisiones provocadas por las quemas de paja, es recomendable evaluar la factibilidad técnica y económica para reconvertir tal biomasa residual y utilizarla como materia prima para la obtención de biocombustibles o directamente en procesos de generación eléctrica.

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    Authors: Figueroa, Olga Gómez; Laguardia, Naylet Sangroni; Castañeira, Jessie Arlene Pérez; Suárez, Yasniel Sánchez;

    Resumen La investigación de mercado es un tema actual que permite acercarse cada vez más a satisfacer las necesidades de los clientes. El artículo tiene como objetivo desarrollar una investigación comercial para conocer las preferencias de los clientes respecto al producto jabón tocador Lis. Para dar cumplimiento a tal objetivo se emplearon los métodos y técnicas siguientes: análisis de documentos, observación directa, tormenta de ideas, procedimiento de muestreo combinado, encuestas a clientes, matriz de importancia percepción, y herramientas informáticas como Microsoft Visio 2010, software estadístico SPSS y el EndNoteX7 para la gestión de las referencias bibliográficas. Entre los principales resultados se obtiene que las características del producto que mayor atención debe prestarle la empresa son: durabilidad, aroma y textura, para ello se propone que la entidad revise su sistema productivo y la fórmula del producto con el fin de mejorar las características mencionadas. Abstract Market research is a current topic that allows us to get closer and closer to satisfying the needs of customers. The objective of this paper is to develop a commercial investigation to find out the preferences of customers regarding the Lis toilet soap product. To fulfill this objective, the following methods and techniques were used: document analysis, direct observation, brainstorming, combined sampling procedure, customer surveys, perception importance matrix, and computer tools such as Microsoft Visio 2010, SPSS statistical software and EndNoteX7 for managing bibliographic references. Among the main results, it is obtained that the characteristics of the product that the company must pay the most attention are: durability, aroma and texture, for this it is proposed that the entity review its production system and the product formula in order to improve the aforementioned characteristics. Los autores declaran no presentar conflictos de intereses

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    ZENODO
    Article . 2021
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    Article . 2021
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      Article . 2021
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    Authors: Gutberlet, Jutta;

    Os desafios que catadores e catadoras de materiais recicláveis enfrentam no seu dia a dia já são inúmeros e a introdução de tecnologias que queimam resíduos sólidos para captar energia significa outro fator que põe em risco a sobrevivência desta população. Seguindo a lógica da globalização econômica, grandes empresas multinacionais de saneamento ambiental estão entrando no mercado da gestão de resíduos sólidos nos países em desenvolvimento. Coleta, separação, transformação e venda de materiais recicláveis por grupos organizados de catadores geram trabalho e renda: trata-se de capital social e humano. Nos países da América Latina e da Ásia, em particular, milhares de pessoas dependem desse setor. Essa atividade oferece oportunidades para a inclusão social com resgate da cidadania. A implantação de incineradores significa uma ameaça a estes postos de trabalho, sem mencionar os problemas ambientais gerados pelos gases e cinzas tóxicas eliminados durante o processo da queima. A presente pesquisa-ação utiliza métodos participativos e analisa dados secundários, tendo como objetivos desconstruir a lógica tecnocrata de gestão de resíduos sólidos e apontar a importância do compromisso social e ambiental dos governantes e da sociedade com a coleta seletiva e a reciclagem, aumentando desta forma a sustentabilidade social, econômica e ecológica.

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    Authors: Félix Sánchez de Jesús;

    Niquelado químico; Codepositación; Alúmina; Recubrimientos

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    Authors: Raquel Salazar Moreno; Pedro Cruz Meza; Abraham Rojano Aguilar;

    La producción bajo invernaderos es una de las ramas de la agricultura que más energía consume, el costo por concepto de consumo de energía en invernaderos varía entre 20-40% del costo total dependiendo del tipo de producción. En México existen diferentes niveles de tecnología distribuidos a lo largo del país, que van desde producción a campo abierto hasta invernaderos de alta tecnología con diversos sistemas de control climático. La producción de alta tecnología presenta rendimientos elevados con alta calidad con un uso óptimo de la tecnología en un esquema amigable con el ambiente. En este trabajo se presenta el análisis energético a detalle en la producción de jitomate para dos invernaderos, uno localizado en Baja California y el otro en Puebla, que se utiliza para dos ciclos de producción durante el año. El primer invernadero no requiere de un sistema de calefacción, debido a que se utiliza para un ciclo de producción. En el segundo invernadero, cuenta con un sistema de calefacción, dado que se utiliza durante todo el año. La productividad energética fue de 2.43 kg MJ-1 y 0.4 kg MJ-1 y el uso de energía por m2 se estimó en 5.14 MJ m-2 y 1085 MJ m-2 para el invernadero sin y con calefacción (Valle de Mexicali y Puebla) respectivamente. Los resultados muestran que es indispensable incrementar la eficiencia en el uso de la energía en los sistemas de calefacción, utilizando otras opciones existentes en el mercado, así como el evitar pérdidas de calor durante la noche.

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    Authors: Salvador Jara Guerrero; Juan Torres Melgoza;

    Vivimos en la era del conocimiento, disfrutando sus logros y temiendo sus riesgos. Y a pesar de la enorme cantidad de información científica generada cada día, en nuestra sociedad el analfabetismo científico es alarmante: basta con observar el incremento en la difusión de pseudociencias, sectas y charlatanerías que buscan manipular a las poblaciones mundiales aprovechando su ignorancia científica. En el fondo de esta paradoja está la incapacidad de la población para evaluar y distinguir entre un conocimiento científico y la charlatanería, entre la potencialidad de la ciencia y sus riesgos. La última oportunidad escolar de quienes no estudian ciencias para aprender y analizar los temas científicos de manera crítica es la preparatoria; por ello este trabajo explora las concepciones que de la ciencia y los científicos tienen los estudiantes de ese nivel. Los resultados muestran una ambivalencia en las opiniones estudiantiles, que puede ser el reflejo de su incapacidad para distinguir un conocimiento de una mera opinión o de una mentira.

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