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1
artículo
Publicado 2017
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A novel method to prepare BC nanocomposites reinforced with reduced graphene oxide (RGO) is reported. A simple hydrazine treatment is shown to in-situ reduce the graphene oxide (GO) incorporated to BC films while increasing their conductivity. Raman spectroscopy was used to confirm the presence of graphene and assess the effect of the hydrazine treatment on its structure. XRD tests revealed no changes on BC structure. We hypothesize that this treatment removes the hydroxyl and epoxy groups present on the reduced graphene and increases the content of nonoxygenated carbon. These changes account for the increase in conductivity of the BC-based films, which behaved as an insulating material before the hydrazine treatment and reach an average conductivity value of 12 S/m after such a treatment.
2
objeto de conferencia
Publicado 2018
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The leaching of valuable metals from mineral ores is the basis of several extractive economies around the world, but the strategies employed often need to rely on dangerous compounds such as cyanides. Due to the complex nature of most ores, leaching processes are slow and have a low efficiency in noble metal extraction, which is usually improved by fine-milling the mineral. In this manuscript, we consider this strategy, demonstrating that it may increase the amount of silver leaching, but at the expense of a higher consumption of cyanide, which renders the process inefficient (only 2% of consumed cyanide is employed to complex silver). The increase in the yield of the desired product without the smarter use of dangerous compounds is shown as a paradigm of the need to insert green chemistry principles in industrial processes. We further present the result of two potential strategies for g...
3
artículo
Publicado 2020
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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.
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5
artículo
Publicado 2019
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The performance of discrete element method (DEM) simulations is highly dependent on the requirements of the associated algorithms in terms of computer memory usage and CPU time. In particular, computer CPU time heavily depends on the identification of neighbor particles and the computation of particle-particle interactions. Over the years several neighbor particles searching methods have been developed. Accordingly, in this work the performance of two of well-known searching methods, linked cell and Verlet tables algorithms, are assessed in the context of the development of a new DEM-based tool. More specifically, the neighbor searching methods performance and related computational costs are parametrically analyzed and an assessment of their suitability for carrying the intended numerical simulations is provided. The referred numerical simulations are performed accounting for a canonical...
6
objeto de conferencia
Publicado 2018
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This work was supported by the Consejo Nacional de Ciencia Tecnología e Innovación Tecnológica (CONCYTEC) y el Fondo Nacional De Desarrollo Científico, Tecnológico Y De Innovación Tecnológica (FONDECYT)
7
artículo
Publicado 2019
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Introducción: La socialización en un entorno violento puede favorecer la aceptación y el aprendizaje de las conductas violentas. El objetivo del estudio es analizar la asociación entre la violencia de género en el entorno y la perpetración y victimización de violencia en el noviazgo. Método: La muestra está compuesta por 443 estudiantes de diferentes universidades de Colombia, con una edad media de 20.64 años (SD = 3.91). Los niveles de agresión se midieron mediante la versión modificada de la Conflicts Tactics Scale (M-CTS). Resultados: La perpetración y la victimización de agresiones en el noviazgo son mayores entre las personas en cuyo entorno ha tenido lugar algún caso de violencia de género. Conclusión: La exposición a la violencia de género puede influir en la normalización de la violencia y en su aparición en las relaciones d...
8
artículo
Condylar hyperactivity (CH) is a rare condition that entails a progressive deviation and deformation of the mandible. There is no consensus regarding characteristic histopathological features or a standardized diagnostic process; thus, histopathological analysis of the condyle cannot confirm or exclude an active CH after condylectomy is performed. An electronic search was performed in Medline, Embase, Web of Science, LILACS and grey literature up to December 2019. Additionally, a manual search was performed. Risk of bias of the included studies was assessed using the Newcastle–Ottawa Scale and the Institute of Health Economics Quality Appraisal. All analyses were performed independently and in duplicate. Seventeen articles from 660 were included. Six articles were crosssectional studies and 11 were case series. Almost all the articles (14) described an augmented thickness of the cartil...
9
artículo
Publicado 2015
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We wish to thank Laurent Pham-Van (CEA/IRAMIS/SPEC/LEPO) for fruitful discussions on the tip etching process and Sylvain Foucquart (CEA/IRAMIS/NIMBE/LIONS) for his technical assistance. José Antonio Morán Meza would also like to acknowledge financial support from the Peru’s National Council of Science and Technology (Concytec), the Réseau Thématique de Recherche Avancée (RTRA-Triangle de la Physique), and the CEA/Direction des Relations Internationales (DRI).
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artículo
Publicado 2016
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The authors are grateful to Stefanie Hoser for surface polishing of the samples. This work has been partly conducted within the European integrated Center for the development of new Metallic Alloys and Compounds (European C-MAC). M.W. and M.P. are grateful for funding by the German Academic Exchange Service (DAAD), Grant no. A/14/02942, and by Peruvian Council of Science and Technology (CONCYTEC), Grant no. 221-2014-FONDECYT, respectively.
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objeto de conferencia
This research was supported by the FONDO NA-CIONAL DE DESARROLLO CIENT´FICO, TEC-NOLÓGICO Y DE INNOVACIÓN TECNOLÓGICA -FONDECYT as executing entity of CONCYTEC under grant agreement no. 01-2019-FONDECYT-BM-INC.INV in the project RUTAS: Robots for Urban Tourism, Autonomous and Semantic web based.
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artículo
Publicado 2019
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The present work is the study of the different methods used to determine the toxicity produced by the presence of a contaminating metal in the blood. Mainly, the presence of lead in the blood was taken as a reference to focus the work, knowing that metals like Cadmium (Cd) and Mercury (Hg) are also toxic to health and the environment. Although the information is extensive on the methods to be studied and in some cases it is not detailed to define each process, a comparative study of the most relevant and currently used methods can be carried out, taking into account that the choice will be defined according to the main characteristics of each one. Although all agree to be electrochemical processes, there are details to know which method to choose, either by sensitivity, economic or even structural factors, such as having a laboratory for its development. Environmental pollution with toxi...
13
objeto de conferencia
Publicado 2012
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The authors would like to thank the UNI and CONCYTEC for the financial support during the study of this research.
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artículo
Publicado 2017
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This study was partially funded by the Dirección de Gestión de la Investigación at Pontifical Catholic University of Peru and the Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica del Perú (CONCYTEC from its acronym in Spanish), according to the Convenio de Gestión N° 232-2015-FONDECYT. We would also like to thank to Dilmer Dueñas, who kindly participated as instructor in the workshops
15
artículo
Publicado 2019
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This project was carried out thanks to the scholarship funds for postgraduate studies of CONCYTEC PERU. Also, the tests were performed at the Structures Laboratory of the Pontifical Catholic University of Peru.
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artículo
Publicado 2021
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This research was supported by the FONDO NACIONAL DE DESARROLLO CIENTÍFICO, TECNOLÓGICO Y DE INNOVACIÓN TECNOLÓGICA – FONDECYT as executing entity of CONCYTEC under grant agreement no. 01–2019-FONDECYT-BM-INC.INV in the project RUTAS: Robots para centros Urbanos Turísticos Autónomos y basados en Semántica.
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artículo
Publicado 2019
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One of the first subjects studied in Electricity and Magnetism classes is how one can make an electrically neutral object be an electrically charged object. There are three ways to do it: charging by friction, charging by contact and charging by induction. Induction charging is a method used to charge an object without actually touching the object to any other charged object. In order to illustrate the explanation of how the process of charging an electrically neutral body by induction, a 3D model was built using the finite elements method to show the increasing of the surface charge density in a initially neutral sphere when the distance between this sphere and a negatively charged bar decreases.
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artículo
Publicado 2017
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I would like to thank Edwin Silva, teacher and friend, who has always been very generous. Many thanks also to Leslye Valenzuela for her patience and comments. Thanks also go to: Mr. Grobel Irupaiya Canales, Lacayan, who hosted us at Incuyo; Mr. Wilver Benitez Diestro, mayor of the Puyusca district, for his collaboration in transportation and logistics; Carlos Rengifo, for his help in the English version of this manuscript; and Dr. Frederick Foulds, for his patience. This research was funded by the Consejo Nacional de Ciencia,Tecnología e Innovación Tecnológica (CONCYTEC), through Cienciactiva.
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objeto de conferencia
Publicado 2017
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This work was partially funded by the Dirección de Gestión de la Investigación at the PUCP, and the Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica del Perú (CONCYTEC from its acronym in Spanish), according to the Convenio de Gestión N° 232-2015-FONDECYT. We would also like to thank to Dilmer Dueñas, who kindly participated as instructor in the workshops.
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artículo
Publicado 2022
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Funding Statement: Authors are grateful to Concytec-Peru and The World Bank for the financial support of this project under the call “Mejoramiento y Ampliación de los Servicios del Sistema Nacional de Ciencia Tecnología e Innovación Tecnológica” 8682-PE, through Fondecyt Grant 017-2019 FONDECYT BM INC.INV.
