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1
artículo
The solution‐combustion process is presented, as well as its application to the synthesis of YAlO3 (YAP). Urea and glycine were used as fuel for the combustion reaction and synthesis of the YAP. The structure and morphology of the obtained sample were analyzed using the X‐ray diffraction (XRD) powder method and scanning electron microscopy (SEM). The X‐ray patterns showed an excellent agreement with data reported in the literature for this material. Results are also given for samples of YAlxCrx‐1O3 doped with Cr3+, with x = 0.001, 0.01, which showed dominant diffraction peaks due to the orthorhombic phase of YAlO3.
2
artículo
The solution‐combustion process is presented, as well as its application to the synthesis of YAlO3 (YAP). Urea and glycine were used as fuel for the combustion reaction and synthesis of the YAP. The structure and morphology of the obtained sample were analyzed using the X‐ray diffraction (XRD) powder method and scanning electron microscopy (SEM). The X‐ray patterns showed an excellent agreement with data reported in the literature for this material. Results are also given for samples of YAlxCrx‐1O3 doped with Cr3+, with x = 0.001, 0.01, which showed dominant diffraction peaks due to the orthorhombic phase of YAlO3.
3
artículo
Publicado 2021
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The intensive use of agrochemicals for food production in developing countries has generated a problem of environmental concern since many of these substances, which are usually difficult to biodegrade, can reach natural sources, generating their contamination. That is why the search for new technologies for the elimination of these pollutants has arisen with great interest. Advanced oxidation processes (AOP), whose main characteristic is the generation of highly oxidizing species such as the hydroxyl radical, can achieve the chemical modification of the pollutant, generating by-products that can be less harmful to the environment. In this work, the degradation of methomyl, a highly used insecticide in the Arequipa region, Peru, was evaluated using different PAOs such as ozonation in alkaline medium, UV-C/H2O2 and photo-Fenton processes at acid pH in natural surface waters. The effect of...
4
artículo
Publicado 2005
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Each time is expanded the fan of businesses that diversify its product lines as a form to face the competence and to diversify its risk. In reality this situation does not assure the success of the organization. It is possible in certain circumstances to reduce, to eliminate or to prompt some product line. In this third part a cost-volume-utilities (C-V-U) analysis model is proposed for the management of the costs in a business with several production lines.
5
artículo
Publicado 2020
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IThe objective of this article is to disseminate outstanding research that has been carried out during the last ten years in the field of the School Adaptation Process for children under 3 years. This is a critical period to which our children are exposed given the increasing participation of women in the workplace. This process explains the child's transition from a home life with personalized attention from parents or substitutes surrounded by much affection for an educational environment. In this work a review of the subject is made by dividing it into four factors that can determine the quality of such adaptation: family overprotection of the child, child attachment, change of environment, and the role of parents. This data is expected to be useful for researchers interested in exploring, describing, correlating, and explaining the socio-emotional dynamics in which this interesting p...
6
artículo
Publicado 2020
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IThe objective of this article is to disseminate outstanding research that has been carried out during the last ten years in the field of the School Adaptation Process for children under 3 years. This is a critical period to which our children are exposed given the increasing participation of women in the workplace. This process explains the child's transition from a home life with personalized attention from parents or substitutes surrounded by much affection for an educational environment. In this work a review of the subject is made by dividing it into four factors that can determine the quality of such adaptation: family overprotection of the child, child attachment, change of environment, and the role of parents. This data is expected to be useful for researchers interested in exploring, describing, correlating, and explaining the socio-emotional dynamics in which this interesting p...
7
artículo
Publicado 2010
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Se ha identificado que los actinidos (An) en medio acuoso se coordinan a nueve moléculas de agua para formar complejos de fórmula [An(H2O)9]3+. Esto es importante porque puede ayudar a entender el comportamiento de estos elementos en los desperdicios nucleares, lo cual podría ayudar a la implementación de métodos más eficientes para el tratamiento de dichos desperdicios y así reducir, o evitar, el daño que estos ocasionan al ambiente.
8
artículo
Publicado 2019
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Background: Mechanical reasoning (MR) is the ability to identify the components of a system and understand how they interact in order for the system to work. Different mechanical systems, such as those of wheels and gears, require different types of reasoning. Objective: This study seeks to analyze the relationship that working memory (WM) and processing speed (PS) have with MR. Method: One hundred seventy-three (173) university students were assessed through the DAT test which consisted of 30 MR problems, the symbol search subtest of the WAIS-III battery for assessing the PS, and the BIMET-V and BIMET-VE batteries to evaluate the WM verbal and visuospatial components. Results: Regression analyses showed that the proposed variables do not predict the performance in gear problems, while the visuospatial WM and the PS predict the performance in wheel problems. Discussion: The results sugge...
9
artículo
Objective. To identify limiting factors in the process of preparing a scientific research project in students of the nursing program at Universidad de Huanuco, 2019. Methods. It was an observational, prospective, and analytical study. Population sample comprised of 60 students. Measurement instruments were: interview guide with general characteristics of the sample. Two questionnaires, preparation of a research project and limiting factors, which were validated. For the statistical analysis, Chi-Square test of independence was used, Odds ratio (OR) estimation and p < 0.05 were performed. Results. Project preparation process in 53.3 % (32) was adequate. When contrasting hypotheses it was found that the individual factors: disinterest for contributing to the solution of a problem and/ or needs through research, the no development of critical thinking, little habit of reading scientific ...
10
artículo
Publicado 2017
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A study of the kinetics of discoloration of a 20 ppm solution of Sunfix Yellow S4GL (RAS) reactive dye has been carried out using the H2O2/UV advanced oxidation process (AOP). To optimize the process, the effects on the discoloration of the initial concentration of hydrogen peroxide, the initial pH of the solution, the dye concentration and the intensity of the UV‐ C radiation were evaluated. The optimum values were the following: initial concentration of H2O2 a 3.8 x 10‐2 mol/L, pH3; initial dye concentration: 20 mg/L; UV radiation: 3 bulbs with 15 W of UV‐C power each. The discoloration reaction followed a pseudo first order kinetic model. Under optimum conditions, a one hour treatment yielded 100% discoloration.
11
artículo
Publicado 2017
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A study of the kinetics of discoloration of a 20 ppm solution of Sunfix Yellow S4GL (RAS) reactive dye has been carried out using the H2O2/UV advanced oxidation process (AOP). To optimize the process, the effects on the discoloration of the initial concentration of hydrogen peroxide, the initial pH of the solution, the dye concentration and the intensity of the UV‐ C radiation were evaluated. The optimum values were the following: initial concentration of H2O2 a 3.8 x 10‐2 mol/L, pH3; initial dye concentration: 20 mg/L; UV radiation: 3 bulbs with 15 W of UV‐C power each. The discoloration reaction followed a pseudo first order kinetic model. Under optimum conditions, a one hour treatment yielded 100% discoloration.
12
artículo
Publicado 2019
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In the present study, the stabilization of horse manure (mixture of rice husk, manure and horse urine) was evaluated through an aerobic process similar to composting. The stabilization process was evaluated in two piles of horse manure for 16 weeks, taking samples every week. A decrease in temperature from 66,7 to 41,0 °C, the reduction of the density from 394,0 to 370,4 kg/m3, the reduction of the water retention capacity from 220,7 to 125,6% and the reduction of the respiratory activity of 9.8 to less than 2 mgO2/g ms/d, were indicators of the stabilization of the horse manure, the easily degradable material of manure and urine were removed by aerobic degradation and washed with irrigation, leaving only the rice husk with a minimum fraction of other materials. On the other hand, the increase in total nitrogen and a decrease in the C/N ratio at the end of the week 16 were indicative of...
13
artículo
Publicado 2022
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Over time, different process improvement models have emerged to assess software quality and apply improvements based on the evaluation. Among the most outstanding are CMMI and ISO/IEC 15504, and MPS are the three main models for evaluating and improving software processes. The differences that are addressed in the article are benefits and maturity levels. CMMI is based on the ideas of evil reproduced in a framework with five levels. ISO/IEC 15504, formerly known as SPICE. It has a framework of 6 groups of maturity. MPS-BR is based on CMMI with the difference that it has seven maturity levels. The main difference between CMMI, MPS-BR, and ISO 15504 is their orientation. While CMMI is aimed at large companies, MPS-BR focuses on medium and small companies, and ISO 15004 is aimed at any company, whether large companies or PyMEs.
14
tesis doctoral
Publicado 2022
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Se obtuvieron diecinueve VHHs (dominios variables únicos de los anticuerpos de cadena pesada) que unen a CD105 (endoglina) humano, un co-receptor endotelial de TFG-β implicado en la regulación de la angiogénesis y el desarrollo de tumores, mediante screening por phage display de una biblioteca de ADNc de VHH obtenida de alpacas inmunizadas con un lisado de una línea celular de cáncer de vejiga que sobreexpresa CD105 (T24). Las secuencias de los VHH se analizaron con ExPASY, GeneDoc y BLAST y mostraron las características estructurales típicas de los VHHs. Ellas se clonaron y expresaron en pET22b(+)/E.coli y los VHHs recombinantes se purificaron por cromatografía de afinidad. Trece VHHs anti-CD105 fueron microarreglados en biochips para determinar la especificidad y afinidad a CD105 unido a membrana celular por SPRi, Los datos de SPRi mostraron que los VHHs unen a las células SC...
15
artículo
HY-80 steels; HY-130, such as HP9-4-20; 10Ni-Cr-Mo-Co are the strongest of the special tenacity and highest creep resistance properties, which have been developed for use in critical hydrospace and aerospace applications. In HY-80 type steel, the alloying elements that give high characteristics to the steels, in turn, increase the hardening power and therefore their tendency to crack. The relationship of the microstructure to the toughness property is evaluated for the welded metal and the region of the heat affected zone. SAW, SMAW or EBW welding processes are used in the manufacture of metal structures with these types of materials, however, in repairs or maintenance, the manual metal arc process with low hydrogen coated electrodes, with an adequate sequence and prior control to the qualification of the welder as well as the process in particular, allow presenting this work with satisf...
16
tesis de grado
Publicado 2025
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Esta investigación se basa en la detección de problemas mediante diagnósticos técnicos para comprender la causa raíz a través de la metodología "5 ¿Por qué?" y determinar las mejores prácticas que podrían implementarse para abordar la situación que no permita escalar a un mayor impacto en la producción. Este estudio permitió diseñar, adquirir, instalar, poner en marcha e implementar dos arrancadores directos redundantes y dos variadores de velocidad para controlar la velocidad de dos motores agitadores en dos tanques de concentrado de cobre. Uno de los principales problemas era que los sólidos no procesados se acumulaban en forma de sedimentos en el fondo de los tanques. Esto provocaba un mantenimiento no planificado, que detenía la producción y obligaba a parar los motores y a aplicar un procedimiento de bloqueo y etiquetado (LOTO) para permitir la entrada del personal...
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artículo
Publicado 2013
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The realization of the photo-electrochemical process consists in percolating the solution to be treated through an electrolytic reactor, in which the anodes coated with metal oxides remains under the effect of ultraviolet radiation (UV). The solution used in this study was contaminated artificially from fecal samples positive for bacteria and intestinal parasites. The evaluation of the process for the disinfection of water was held in photo-electrical-chemical reactor, with a total volume of 10.0 Lper batch system contaminated with human fecal material. It was used as the -1supporting electrolyte solution of sodium perchlorate at 0.1 mol. Land applying a current density -1of 14 mAwith the aid of a source and a flow rate of 250 L.h. The UVradiation was provided by a mercury vapor lamp of 55 Wwithout bulb shield. The center electrode is inserted through a quartz bulb. Samples were analyzed...
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informe técnico
En el presente trabajo, se sistematizan los conceptos inherentes al Modelo Data Warehouse, haciendo referencia a cada uno de ellos en forma ordenada, en un marco conceptual claro, en el que se desplegarán sus características y cualidades, y teniendo siempre en cuenta su relación o interrelación con los demás componentes del ambiente. Inicialmente, se definirá los conceptos generales relacionados al Data WareHouse, Seguidamente, se introducirá a la definición de requerimientos y los procesos de negocio para modelar un Data Warehouse, y se expondrán sus aspectos más relevantes y significativos. Luego, se precisarán y detallarán todos los componentes que intervienen en la Integración de Datos, de manera organizada e intuitiva, atendiendo su interrelación. Posterior se describe el Diseño Dimensional para los procesos de Negocio. Finalmente, se describirán algunos conceptos qu...
19
tesis de grado
Publicado 2014
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En los orígenes de la ciencia de la computación todo el énfasis estuvo puesto en desarrollar sistemas que automatizaran tareas que se hacían manualmente. Este era suficiente desafío. En la actualidad, se han automatizado muchas tareas y el gran desafío es cómo mejorar la capacidad de los sistemas para alcanzar nuevos requerimientos: agregar nuevas interfaces, combinar múltiples fuentes de datos en una sola, interactuar con dispositivos móviles y reemplazar viejas aplicaciones con nuevas. La tendencia de hoy es hacia un paradigma orientado a los procesos, donde las aplicaciones cubren la actividad global de la empresa y las herramientas son los BPMS (Business Process Management Systems o Sistemas de Gestión de Procesos de Negocio). Los modelos actuales resultan insuficientes porque son pobres en su integración y se orientan a describir datos y transacciones. El cambio de enfoqu...
20
artículo
Publicado 2020
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Background: endocrine disorders may affect sexuality due to hormonal changes, associated comorbidities and psychosocial impact. This topic remains poorly researched from the perspective of people with these conditions. Objectives: a qualitative research was conducted to understand the sexual experiences of women and men living with endocrine disorders that change their physical appearance. Methods: an analytical-interpretive study was carried out with a sample of 68 participants aged between 20 and 45, and treated at the National Institute of Endocrinology, Havana, Cuba. Data collection instruments were a personal information sheet, an in-depth interview guide and two projective psychological tests. Ethical aspects were considered. Results: in-depth interviews gave rise to four topics: 1) multidimensional expression of the disease, 2) the disease and life areas, 3) sexuality with the dis...
