Omnidirectional conformal patch antenna at S-band with 3D printed technology

A conformal patch array antenna with omnidirectional pattern in the azimuth plane at Sband is presented. A theoretical study of the generated ripple in the omnidirectional radiation pattern according to the number of faces that conform the array has been computed. A six-faced regular prism 3D structure has been chosen following a maximum 3 dB ripple criteria in the omnidirectional radiation pattern. A rectangular microstrip patch fed by a microstrip line has been designed as single radiating element. An equal power divider has been designed as feeding network in microstrip technology to feed each radiating element. Several prototypes have been manufactured and measured to validate the theoretical and simulated results. The entire conformal array has been assembled on a hexagonal regular prism manufactured in PolyLactic Acid (PLA) material using a 3D printer. In spite of the complexity of the proposed antenna structure, the used manufacturing processes, such as microstrip and 3D printing, allows to perform a low cost, low weight and compact final antenna. A higher radiated field ripple than the expected one is generated due to small deviations between experimental and theoretical critical parameters such as the feeding network performance or the 3 dB beam-width of the single element radiation pattern. A maximum ripple value of 4 dB has been experimentally obtained in the omnidirectional radiating pattern.This work has been supported by the Spanish Government, Ref. TEC2013-47106-C3-2-R (Project TECOAMP) and Madrid Region Government, Ref. S2013/ICE-3000 (Project SPADERADAR)

Validation of the Spanish Version of the Psychological Sense of School Membership (PSSM) Scale in Chilean Adolescents and Its Association with School-Related Outcomes and Substance Use.

School membership appears to be an important factor in explaining the relationship between students and schools, including school staff. School membership is associated with several school-related outcomes, such as academic performance and expectations. Most studies on school membership have been conducted in developed countries. The Psychological Sense of School Membership (PSSM) scale (18 items: 13 positively worded items, 5 negatively worded items) has been widely used to measure this construct, but no studies regarding its validity and reliability have been conducted in Spanish-speaking Latin American countries. This study investigates the psychometric properties, factor structure and reliability of this scale in a sample of 1250 early adolescents in Chile. Both exploratory and confirmatory factor analyses provide evidence of an excellent fit for a one-factor solution after removing the negatively worded items. The internal consistency of this new abbreviated version was 0.92. The association analyses demonstrated that high school membership was associated with better academic performance, stronger school bonding, a reduced likelihood of school misbehavior, and reduced likelihood of substance use. Analyses showed support for the reliability and validity of the PSSM among Chilean adolescents

Mental health among children and adolescents: Construct validity, reliability, and parent-adolescent agreement on the ‘Strengths and Difficulties Questionnaire’ in Chile

The Strengths and Difficulties Questionnaire (SDQ) is a screening tool used to measure psychological functioning among children and adolescents. It has been extensively used worldwide, but its psychometric properties, such as internal structure and reliability, seem to vary across countries. This is the first study exploring the construct validity and reliability of the Spanish version of SDQ among early adolescents (self-reported) and their parents in Latin America. A total of 1, 284 early adolescents (9–15 years) and their parents answered the SDQ. We also collected demographic variables. A confirmatory factor analysis was conducted to assess the latent structure of the SDQ. We also used the multitrait-multimethod analysis to separate the true variance on the constructs from variance resulting from measurement methods (self-report vs. parent report), and evaluated the agreement between adolescents and their parents. We found that the original five-factor model was a good solution and the resulting sub-scales had good internal consistency. We also found that the self-reported and parental versions of SDQ provide different information, which are complementary and provide a better picture of the emotional, social, and conduct problems of adolescents. We have added evidence for the construct validity and reliability of the Spanish self-reported and parental SDQ versions in a Chilean sample

Mental health among children and adolescents: Construct validity, reliability, and parent-adolescent agreement on the 'Strengths and Difficulties Questionnaire' in Chile.

The Strengths and Difficulties Questionnaire (SDQ) is a screening tool used to measure psychological functioning among children and adolescents. It has been extensively used worldwide, but its psychometric properties, such as internal structure and reliability, seem to vary across countries. This is the first study exploring the construct validity and reliability of the Spanish version of SDQ among early adolescents (self-reported) and their parents in Latin America. A total of 1,284 early adolescents (9-15 years) and their parents answered the SDQ. We also collected demographic variables. A confirmatory factor analysis was conducted to assess the latent structure of the SDQ. We also used the multitrait-multimethod analysis to separate the true variance on the constructs from variance resulting from measurement methods (self-report vs. parent report), and evaluated the agreement between adolescents and their parents. We found that the original five-factor model was a good solution and the resulting sub-scales had good internal consistency. We also found that the self-reported and parental versions of SDQ provide different information, which are complementary and provide a better picture of the emotional, social, and conduct problems of adolescents. We have added evidence for the construct validity and reliability of the Spanish self-reported and parental SDQ versions in a Chilean sample

Sistema experto basado en casos para la asesoría en materia de garantías constitucionales

Publicación a texto completo no autorizada por el autorEn los últimos 30 años, el sistema judicial del Perú ha sido objeto de críticas cada vez mayores a pesar de que a mediados del 2003 se hicieran dos programas de reforma importantes y de una inversión de más de 70 millones de dólares entre 1996 y 2000. Es por eso que en nuestro país, es una interrogante examinar si la mayoría de la población tiene el derecho de acceso a la información y al conocimiento de sus deberes y derechos. En este contexto es de importancia que la informática actual esté de acorde a las necesidades de las personas y para ello se cuenta con los sistemas expertos; los cuales se han convertido en una herramienta útil en el ámbito del derecho y permiten solucionar problemas de una manera rápida, segura y permiten llegar a más personas que necesitan la asesoría de un experto. En la presente tesina se pretende realizar un sistema experto basado en casos en materia de garantías constitucionales para el Tribunal Constitucional con el objetivo de brindar un sistema de apoyo a los magistrados y un servicio para el ciudadano. Para ello se va a integrar la metodología de desarrollo de software de sistemas expertos CommonKADS con el framework de desarrollo de sistemas CBR (razonamiento basado en casos) orientado a objetos JColibri. Al aplicar la metodología CommonKADS, se ha generado un conjunto de formularios con el fin de agrupar de manera estructurada el conocimiento para garantizar que el desarrollo del sistema experto tenga éxito. También se ha aplicado el framework JColibri dentro de la metodología CommonKADS en la fase de diseño, el cual implementa el ciclo de los sistemas CBR. El sistema no resuelve el caso pero da una perspectiva de cómo se desarrollará y será resuelto, acceder a este tipo de servicio en el Perú es un reto, sobre todo el permitir que la ciudadanía sea la beneficiada y tenga acceso a la información y por ende a la justicia.Trabajo de suficiencia profesiona

Incidencia del tratamiento contable y tributario de la provisión de cobranza dudosa en la utilidad antes de impuestos de G & L Servicios Educativos S.R.L., en Cajamarca, año 2019

El Tratamiento Contable y Tributario con respecto a la Provisión de Cobranza Dudosa debe hacerse con total razonabilidad, claridad y conocimiento de las normas que lo regulan de modo que sea un elemento que permita contribuir información contable real y confiable y una tributación de acuerdo a las normas establecidas que ayude a declarar correctamente el impuesto gastos innecesarios. El presente trabajo de investigación tiene como finalidad analizar la incidencia del Tratamiento Contable y Tributario de la Provisión de Cobranza Dudosa en la Utilidad Antes de Impuestos de G&L Servicios Educativos S.R.L., Cajamarca, año 2019. Para ello primero se reconoció de la totalidad de los servicios educativos brindados (independientemente que se haya pagado la pensión educativa), luego se midió la provisión de cuentas de cobranza dudosa, así mismo, se contrastó la información obtenida con fuentes documentales con el fin de procesar los datos recopilados y determinar la Utilidad Antes de Impuestos de la empresa. En resultados obtenidos, se llegó a la conclusión que el Tratamiento Contable y Tributario de la Provisión de Cobranza Dudosa incide de manera indirecta en la Utilidad Antes de Impuestos de la Empresa.The Accounting and Tax Treatment with respect to the Provision of Doubtful Collection must be done with total reasonableness, clarity and knowledge of the regulations that regulate it so that it is an element that allows to contribute real and reliable accounting information and a taxation according to the regulations established that help to correctly declare the tax unnecessary expenses. The purpose of this research work is to analyze the incidence of the Accounting and Tax Treatment of the Provision of Doubtful Collection in the Profit Before Taxes of G&L Servicios Educativos SRL, Cajamarca, year 2019. For this, all the services were first recognized education provided (regardless of whether the educational pension was paid), then the provision of doubtful accounts was measured, likewise, the information obtained was contrasted with documentary sources in order to process the data collected and determine the Earnings Before Taxes of the company. In the results obtained, it was concluded that the Accounting and Tax Treatment of the Doubtful Collection Provision indirectly affects the Company's Earnings Before Taxes

E service quality y technology resources en relación con la satisfacción de estudiantes universitarios a través del E learning

Hoy en día la tecnología se ha posicionado en el estilo de vida de muchas personas. Sin embargo, no todas las personas tienen los recursos tecnológicos para un desarrollo adecuado en el ámbito que quieran desarrollarse. Esto se ha expandido en el sector de educación superior a través de la metodología E-learning debido a las distintas facilidades y ventajas que posee. Esta investigación apunta a poder descubrir la relación del e - service quality y el acceso al technology resources en relación con la satisfacción de estudiantes universitarios con respecto al e- learning en Lima Metropolitana. A través de las distintas teorías e investigaciones de otros autores se ha logrado encontrar los determinantes que poseen la mayor influencia. Entre ellos se encuentra el contenido, la privacidad, el diseño de web, la fiabilidad y sensibilidad así como el acceso a la tecnología de la información y comunicación; es decir un aparato tecnológico, electricidad e internet. Dentro de los alcances y limitaciones encontradas para la investigación se consideraron el no realizar observaciones dentro de los trabajos de campo, debido al virus Sars Cov2.Today technology has positioned itself in the lifestyle of many people. However, not all people have the technological resources for adequate development in the area they want to develop. This has expanded in the higher education sector through the E-learning methodology due to the different facilities and advantages it has. This research aims to discover the relationship between e - service quality and access to technology resources in relation to the satisfaction of university students with respect to e - learning in Metropolitan Lima. Through the different theories and investigations of other authors, it has been possible to find the determinants that have the greatest influence. Among them are content, privacy, web design, reliability and sensitivity as well as access to information and communication technology; That is to say, a technological device, electricity and the internet. Within the scope and limitations found for the research, it was considered not to make observations within the field work, due to the Sars Cov2 virus.Trabajo de investigació

Aplicação de cartas controle para avaliar resultados na verificação de balanças.

Resumo: A carta controle é um tipo de gráfico que pode ser utilizado para monitorar e controlar diversos tipos de análises. Na verificação de balanças o objetivo é monitorar, por meio de gráfico, se não ocorreu nenhum desvio significativo dos valores de massa obtidos no intervalo da calibração, além das tendencias de resultados para tomada de ações preventivas, garantindo a rastreabilidade e confiabilidade dos resultados analíticos. A elaboração, implementação e uso de cartas controle na verificação intermediária de balança analítica no Laboratório de Resíduos e Contaminantes na Embrapa Meio Ambiente, utilizando o programa Microsoft Excel, permite o controle estatístico das características da balança de modo que não se modifique até a próxima calibração, mantendo seu certificado válido. Neste trabalho, visamos à verificação da balança analítica Scientech SA210, para detectar tendências negativas nos trabalhos analíticos que possam ocorrer durante o intervalo da calibração