Strong spin-dependent negative differential resistance in composite graphene superlattices

We find clear signatures of spin-dependent negative differential resistance in compound systems comprising a graphene nanoribbon and a set of ferromagnetic insulator strips deposited on top of it. The periodic array of ferromagnetic strips induces a proximity exchange splitting of the electronic states in graphene, resulting in the appearance of a superlattice with a spin-dependent energy spectrum. The electric current through the device can be highly polarized and both the current and its polarization manifest nonmonotonic dependence on the bias voltage. The device operates therefore as an Esaki spin diode, which opens possibilities to design new spintronic circuits

Nivel de satisfacción de la calidad de servicio al cliente en la Industria Alimentaria Huacariz S. A. C. a través del modelo SERVQUAL en el año 2017

En la presente investigación, se estudió el nivel de satisfacción de la calidad de servicio al cliente en la industria alimentaria Huacariz S.A.C. a través del modelo Servqual en el año 2017, con dicho modelo se mide dimensiones como: tangibilidad, fiabilidad, capacidad de respuesta, seguridad, empatía, con el fin de determinar debilidades y potencializar el impacto que tiene las actividades y productos de esta empresa. El presente estudio tiene como propósito demostrar las necesidades de los clientes, para brindar buenas soluciones de valor agregado y un nivel de excelencia que los satisfaga, y de esta manera garantice su lealtad y maximice el valor generado por cada uno de los clientes que visitan la empresa. Como resultados más resaltantes se obtuvo que la dimensión que más relevancia tiene en los clientes de la industria alimentaria Huacariz S.A.C. en el año 2017 es la dimensión de capacidad de respuesta. El nivel de satisfacción de la calidad en cada una de las dimensiones es de índice alto, ya que se evaluó mediante una encuesta con sus respectivos indicadores de cada dimensión, la cual como resultados se obtuvo que en la dimensión de capacidad de respuesta tiene un 21% de relevancia en la satisfacción del cliente, 20% la dimensión de fiabilidad, 20% la dimensión de seguridad, 20% la dimensión de Empatía y un 19% la dimensión de tangibilidad.In the present investigation, the level of satisfaction of the quality of service to the client in the food industry Huacariz S.A.C. Through the Servqual model in 2017, this model measures dimensions such as: tangibility, reliability, responsiveness, security, empathy, in order to determine weaknesses and potentiate the impact of the activities and products of this company. The purpose of this study is to demonstrate the needs of the clients, to provide good value added solutions and a level of excellence that satisfies them, and in this way guarantee their loyalty and maximize the value generated by each of the customers who visit the company. As more outstanding results it was obtained that the dimension that more relevance has in the customers of the food industry Huacariz S.A.C. in 2017 it is the response capacity dimension. The level of satisfaction of the quality in each one of the dimensions is of high index, since it was evaluated by means of a survey with their respective indicators of each dimension, which as results was obtained that in the dimension of response capacity has a 21 % of relevance in customer satisfaction, 20% the reliability dimension, 20% the security dimension, 20% the Empathy dimension and 19% the tangibility dimension

Systemic Design for a sustainable local economic development: Lea-Artibai case study

[EN] The Systemic Design approach provides a methodology to define complex territorial network of companies with reduced environmental impact. This method defines a way of analysis to understand and map the complexity of current issues addressing them at different levels, in order to design appropriate and long lasting solutions mainly based on the increase of relations between the involved actors. The creation of a network of connections permits to obtain several positive outcomes that involve both the territory and the society that lives in it and it also makes the system more resilient. An holistic diagnosis is the starting point for the identification of different areas to develop a systemic project. This methodology was applied to Lea-Artibai, a department of the Basque Country. Its economy is historically based on forestry and fishing that are currently facing a long-lasting crisis and it is difficult to intervene in these sectors for the complexity of the regulatory system. The holistic diagnosis highlighted other territorial potentialities of the area, mainly the agri-food sector (with traditional products and dishes) and the deeply rooted culture of cooperation. As a kick-off for the creation of the net between the different actors of the department was chosen the creation of a 'Systemic Buying Group (SBG)'. It enables to start the cooperation between the partners for the success of the pilot project: a large cooperative with its employees as potential clients, a cooperative of local producers and transformers, a little shop working as the bridge of communication between them. At their side operate AZARO Fundazioa (a private non–profit centre for entrepreneurship and innovation that promotes the creation of new businesses and the competitive improvement of the business network) as the coordinator of the project and the Systemic Design Group of Politecnico di Torino in the role of project leader. The project underlines the role of design as a deeply interdisciplinary field of work that is able to talk and cooperate with different disciplines to reach a collective goal: the environmental, social and economic sustainability. The SBG becomes the driver of change for the enhancement of the territory and the implementation of systemic design in the area, for an economy based on the quality instead of the quantity. A concrete action that acts on a small scale permits to manage the transition from the design of intangible to tangible.Battistoni, C.; Pallaro, A.; Arrizabalaga Arambarri, L. (2016). Systemic Design for a sustainable local economic development: Lea-Artibai case study. En Systems&design:beyond processes and thinking. Editorial Universitat Politècnica de València. 883-900. https://doi.org/10.4995/IFDP.2015.3309OCS88390

La aristocracia limeña al final de una era:precisiones conceptuales y estimaciones patrimoniales

No presenta resumen

A new compilation of stomach content data for commercially-important pelagic fish species in the Northeast Atlantic

There is increasing demand for information on predator–prey interactions in the ocean as a result of legislative commitments aimed at achieving sustainable exploitation. However, comprehensive data sets are lacking for many fish species and this has hampered development of multispecies fisheries models and the formulation of effective food-web indicators. This work describes a new compilation of stomach content data for five pelagic fish species (herring, blue whiting, mackerel, albacore and bluefin tuna) sampled across the northeast Atlantic and submitted to the PANGAEA open-access data portal (www.pangaea.de). We provide detailed descriptions of sample origin and of the corresponding database structures. We describe the main results in terms of diet composition and predator–prey relationships. The feeding preferences of small pelagic fish (herring, blue whiting, mackerel) were sampled over a very broad geographic area within the North Atlantic basin, from Greenland in the west, to the Lofoten Islands in the east and from the Bay of Biscay northwards to the Arctic. This analysis revealed significant differences in the prey items selected in different parts of the region at different times of year. Tunas (albacore and bluefin) were sampled in the Bay of Biscay and Celtic Sea. Dominant prey items for these species varied by location, year and season. This data compilation exercise represents one of the largest and most wide-ranging ever attempted for pelagic fish in the North Atlantic. The earliest data included in the database were collected in 1864, whereas the most recent were collected in 2012. Data sets are available at doi:10.1594/PANGAEA.820041 and doi:10.1594/PANGAEA.826992

Clima organizacional y desempeño laboral: Una revisión sistemática

El trabajo realizado en esta investigación tiene como designio el probar la congruencia que tienen entre si las variables de Clima Organizacional y el Desempeño Laboral, viendo en el análisis que las variables se vinculan unas a otras dando como resultado que a mejor clima laboral esta variable tendrá una huella en el desempeño profesional de los empleados en la empresa, y de esa forma los colaboradores rendirán mejor sus actividades en la empresa, demostrando que la percepción de los colaboradores influye en su producción, siempre y cuando el entorno laboral sea el adecuado.TesisComunicación y desarrollo human

Experimentally Generating Any Desired Partially Coherent Schell-model Source Using Phase-only Control

A technique is presented to produce any desired partially coherent Schell-model source using a single phase-only liquid-crystal spatial light modulator (SLM). Existing methods use SLMs in combination with amplitude filters to manipulate the phase and amplitude of an initially coherent source. The technique presented here controls both the phase and amplitude using a single SLM, thereby making the amplitude filters unnecessary. This simplifies the optical setup and significantly increases the utility and flexibility of the resulting system. The analytical development of the technique is presented and discussed. To validate the proposed approach, experimental results of three partially coherent Schell-model sources are presented and analyzed. A brief discussion of possible applications is provided in closing

Elaboración de yogurt probiótico con fibras prebióticas a partir de yacón “Smallanthus Sonchifoliu” para el control del peso

Objetivos: Se elaboró yogurt probiótico con fibras prebióticas a partir de yacón para el control de peso. Muestra: Irrestricta no probabilística. Métodos: Diseño cuasi experimental, de corte longitudinal. El monitoreo del control de peso se midió al inicio y mensualmente Resultados: El tratamiento del yogurt probiótico con fibras prebióticas con dosis de 250 ml al día produjo una reducción del sobrepeso y la obesidad, alcanzando niveles moderados de peso promedio, siendo mayor después del tercer mes de tratamiento. Un 50,0% las personas de diferentes grupos etarios del distrito de Independencia – Lima que probaron el yogurt prebiótico de yacón presentan mayor aceptabilidad en el olor, un 44,0% muestran mayor aceptabilidad en el color, un 46,0% evidencias mayor aceptabilidad en la textura y un 54,0% tienen gran aceptabilidad en el sabor. En los análisis químico proximal se obtuvo una humedad de 85,24 g/100g; sólidos lácteos totales 14,76 g/100g; materia grasa láctea 0,60 g/100g; acidez valorable 0,827 g/100g ; Sólidos No grasos Lácteos 14,20 g/100g y Proteína Láctea 3,83 g/100g, así mismo Fibra Dietaría Total g/100 g de muestra original, en lo referente a los análisis microbiológicos el yogurt está bajo los parámetros establecidos. Conclusiones: El yogur probiótico tiene buena aceptación como “me gusta mucho”, es un alimento con fibras prebióticas cuya ingesta redujo el sobrepeso durante los tres meses de la aplicación. Sí, es posible que las personas que recibieron dieta controlada reduzcan de peso después de haber consumido yogurt probiótico con fibra prebiótica