On the periodic solutions of a generalized smooth or non-smooth perturbed planar double pendulum

We provide sufficient conditions for the existence of periodic solutions with small amplitude of the non--linear planar double pendulum perturbed by smooth or non--smooth functions.Comment: arXiv admin note: substantial text overlap with arXiv:1109.637

On the periodic solutions of a perturbed double pendulum

We provide sufficient conditions for the existence of periodic solutions of the planar perturbed double pendulum with small oscillations.Comment: arXiv admin note: substantial text overlap with arXiv:1203.049

On sliding periodic solutions for piecewise continuous systems defined on the 2-cylinder

This paper deals with discontinuous differential equations defined on the 2–dimensional cylinder. The main goal is to exhibit conditions for the existence of typical periodic solutions of such systems. An averaging method for computing sliding periodic solutions is developed, subject to convenient assumptions. We also apply the method to example problems. The main tools used are structural stability theory for discontinuous differential systems and Brouwer degree theory

Estudio de prefactibilidad para la instalación de una planta productora de leche de tarwi sabor a chocolate enriquecida con omega 3

Actualmente, uno de los problemas más presentes en la salud de los peruanos es la Anemia, la cual afecta en su mayoría a mujeres y disminuye la capacidad física de sus cuerpos. Asimismo, nuevas tendencias se hacen presentes como lo son el veganismo o los estilos de vida que tienen un mayor enfoque en el valor nutricional de las cosas, lo cual da oportunidad a que nuevos productos sean lanzados al mercado nacional. El presente trabajo busca evaluar y determinar la viabilidad de la instalación de una planta productora de leche de tarwi sabor chocolate y enriquecida con omega 3. En primer lugar, se realizó un estudio de mercado para determinar la demanda especifica del proyecto. Posteriormente, se determinó la ideal localización de la planta según factores de macro y microlocalización, resultando como ubicación ideal el departamento de La Libertad en la provincia de Trujillo. De igual manera, se determinó que el tamaño de planta sería de 139,486 cajas de 12 botellas por año. Finalmente, se determinó una inversión total de S/. 3,536,707.16 y se realizó una evaluación económica, financiera y social del proyecto, obteniendo un VAN financiero de S/. 1,339,539 y un TIR financiero de 25.93% considerando un COK de 12.53%. Por lo cual podemos determinar la viabilidad del proyecto.Currently, one of the most present problems in the health of Peruvians is Anemia, which affects mostly women and decreases the physical capacity of their bodies. Likewise, new trends are emerging, such as veganism or lifestyles that have a greater focus on the nutritional value of things, which gives the opportunity for new products to be launched in the national market. The present work seeks to evaluate and determine the feasibility of installing a plant to produce chocolate-flavored tarwi milk enriched with omega-3. First, a market study was conducted to determine the specific demand for the project. Subsequently, the ideal location for the plant was determined according to macro and micro-location factors, resulting in the ideal location being the department of La Libertad in the province of Trujillo. It was also determined that the plant size would be 139,486 boxes of 12 bottles per year. Finally, a total investment of S/. 3,536,707.16 was determined and an economic, financial and social evaluation of the project was carried out, obtaining a financial NPV of S/. 1,339,539 and a financial IRR of 25.93% considering a COK of 12.53%. Therefore, we can determine the feasibility of the project

Formación ciudadana en administraciones de Bogotá (1995-2017): estrategias educativas desarrolladas en el espacio público.

Tesis de maestría en educación la cual se centra en identificar las diferentes estrategias educativas enfocadas en la formación ciudadana, gestadas en el espacio público por parte de las administraciones de Bogotá desde el año 1995 al 2017. De manera general es un trabajo que permite recoger algunos de los archivos generados por las entidades gubernamentales de la ciudad de Bogotá D.C. referentes a la educación en el espacio público, posibilitando a futuros investigadores en el tema tener un marco de antecedentes bajo un análisis especifico discriminado por administraciones de alcaldía mayor. Además de contribuir a la Pedagogía Urbana en su consolidación como campo de conocimiento. En este sentido, reciben especial atención los conceptos de espacio público, pedagogía urbana, ciudad educadora, ciudadanía, cultura ciudadana. Esta exploración se enmarca bajo una metodología de revisión documental, donde se emplea el análisis de contenido como técnica principal de investigación. Los hallazgos cuentan con una primera sistematización de archivos, posterior se establece la relación de las estrategias educativas y la formación ciudadana enmarcada por unos articuladores pedagógicos en relación a las categorías teóricas y para finalizar una reflexión de las propuestas en el marco de la Pedagogía Urbana

Acciones de la reforma agraria y su incidencia en el desarrollo rural y su planificación del territorio en el departamento de Caldas: parcelación vereda Cuba, municipio de Neira 1998-2017

“El desorden característico de la ocupación del territorio nacional fue el resultado de ausencias de Estado, vacíos en la jerarquización de los componentes del espacio nacional, la carencia de políticas y orientaciones para el poblamiento, la formación de los asentamientos humanos y el acceso a la tierra, además del profundo deterioro ambiental y la ampliación de la pobreza, el surgimiento de condiciones que ponen en jaque el modelo social, económico y político vigente. Fajardo Montaña, (2002). Berry (2002) Indica que la extrema desigualdad en la distribución del acceso a la tierra y la ambigüedad de los derechos de propiedad en el país, han contribuido a otros problemas de carácter económico y social, como el de la violencia. Se esperaría que una adecuada reforma agraria lograra “la redistribución de recursos productivos, para mejorar redistribución del ingreso, poder político, y beneficios para la población rural” Carrol, Chonchol, Barraclough, García y otros analistas, citados por Delgado (1965) y leído en el Centro Nacional de Memoria Histórica, (2013; 15). En el caso específico de la vereda Cuba, perteneciente al municipio de Neira en el Departamento de Caldas, a pesar de que el territorio ha estado influenciado por las acciones de un sistema de reforma agraria, los habitantes de la vereda han visto limitada sus posibilidades para mejorar sus condiciones de vida, encontrándose inmersos en procesos de atomización de tierra y de desplazamiento por factores económicos, debido a la falta de articulación de los actores institucionales y la ausencia de una lectura del contexto que permita una gestión eficiente de los recursos para generar desarrollo en sus pobladores, sumado todo esto a un abandono del proceso principalmente por los actores departamentales y nacionales y en los últimos años la ausencia del acompañamiento necesario en este tipo de procesos. Es por ello que la investigación se orientó a identificar la incidencia de los procesos de reforma agraria en el desarrollo rural y la planificación del territorio en la vereda Cuba del municipio de Neira, Departamento de Caldas, desarrollando una investigación mixta de estudio de caso con una muestra de 50 propietarios, determinada con un nivel de confianza de 90%, y complementada con la aplicación de dos instrumentos direccionados a grupos focales, cuyos resultados permitieron hacer una caracterización de la Vereda Cuba, determinar que la adjudicación de las tierras sí mejoró la calidad de vida de las personas desde condiciones objetivas y xii subjetivas, pero debilidades en el proceso de planeación, asociados a la ocupación de hecho, y a vacíos y ambigüedades en la normatividad aplicable, además de la debilidad de la entidad territorial municipal, las características agroecológicas, los bajos niveles educativos de la comunidad, la perdida de capacidades instaladas y de tejido social con el cambio en la configuración del estado de tenencia de las tierras, ha conducido a que el proceso se revierta y la concentración de la tierra en unos pocos vuelva a emerger, generando niveles de inequidad y perdida de las inversiones hechas por la triada Estado-Universidad-Comunidad.“The characteristic disorder of the occupation of the national territory was the result of State absences, gaps in the hierarchy of the components of the national space, the lack of policies and guidelines for the settlement, the formation of settlements and access to land, in addition to the profound environmental deterioration and the expansion of poverty, the emergence of conditions that jeopardize the social, economic and current politician. Fajardo Montaña, (2002). Berry (2002) indicates that extreme inequality in the distribution of access to land and the ambiguity of property rights in the country, have contributed to other problems of an economic and social nature, such as violence. It would be expected that an adequate agrarian reform would achieve “the redistribution of productive resources, to improve income redistribution, political power, and benefits for the rural population ”Carrol, Chonchol, Barraclough, García and other analysts, cited by Delgado (1965) and read in the National Center for Historical Memory, (2013; 15). If specific to the Cuba village, belonging to the municipality of Neira in the Department of Caldas, despite the fact that the territory has been influenced by the actions of a system of agrarian reform, the inhabitants of the village have been limited in their possibilities to improve their living conditions, finding themselves immersed in processes of atomization of land and displacement by economic factors, due to the lack of articulation of the actors institutional and the absence of a reading of the context that allows efficient management of the resources to generate development in its inhabitants, added all this to an abandonment of the process mainly by departmental and national actors and in the last years the absence of the necessary support in this type of process. That is why the the research was aimed at identifying the incidence of agrarian reform processes in the rural development and land planning in the Cuba village of the Neira municipality, Department of Caldas, developing a mixed case study investigation with a sample of 50 owners, determined with a confidence level of 90%, and supplemented with the application of two instruments aimed at focus groups, whose results allowed to make a characterization of the Vereda Cuba, determine that the award of the lands did improve the quality of life of the people from objective conditions and xii subjective, but weaknesses in the planning process, associated with de facto occupation, and to gaps and ambiguities in the applicable regulations, in addition to the weakness of the entity municipal territory, agroecological characteristics, low educational levels of the community, the loss of installed capacities and social fabric with the change in configuration of the state of land tenure, has led to the process being reversed and the concentration of land in a few re-emerges, generating levels of inequity and loss of investments made by the State-University-Community triad

Frequency of atherosclerotic cardiovascular disease and its risk factors in patients with systemic lupus erythematosus

INTRODUCTION: the pathogenesis of coronary disease in systemic lupus erythematosus patients is not completely understood. Risk factors associated with lupus or its treatment may be associated with traditional risk factors for coronary disease. Such risk factors are more common in patients with lupus. OBJECTIVE: to determine the frequency of cardiovascular disease and traditional risk factors in patients with systemic lupus erythematosus at Rheumatology Division of Hospital das Clínicas of Minas Gerais Federal University. METHODS: 172 patients with systemic lupus erythematosus were evaluated. Cardiovascular events, traditional risk factors and clinical-laboratorial findings were investigated in this cross-sectional research. RESULTS: the mean age (SD) of the patients was 38.5 years (11.2 years). 95.9% were female and 64.5% were non white. Cardiovascular disease was identified in 8 patients (4.7%), with 11 different diagnoses. Three patients had coronary insufficiency, three had stroke and five had peripheral arterial disease. Systemic arterial hypertension was the most frequent risk factor (48.8%), followed by dyslipidemia in 70 patients (40.7%) and hypertriglyceridemia in 51 patients (29.7%). LDL-c > 100 mg/dl was found in 77 patients (44.8%). Among 165 female patients, 67 (40.6%) had menopause, 43.3% of them with early menopause. CONCLUSION: the present study describes the frequency of risk factors for coronary artery disease in a Brazilian sample of lupus patients. The impact of recognition and management of those risk factors in prevention of cardiovascular events should be object of others studies.INTRODUÇÃO: a patogênese da doença arterial coronariana no lúpus eritematoso sistêmico não está completamente estabelecida, porém fatores relacionados ao lúpus e ao seu tratamento parecem se associar à presença de fatores de risco tradicionais. Esses fatores de risco estão presentes em indivíduos com lúpus em uma freqüência maior em relação à população geral e correlacionam-se à presença de doença cardiovascular manifesta nessa população. OBJETIVOS: determinar a freqüência da doença cardiovascular manifesta e dos fatores de risco em pacientes com lúpus acompanhados no Serviço de Reumatologia do Hospital das Clínicas da UFMG. MÉTODOS: avaliação transversal de 172 pacientes com lúpus. Eventos cardiovasculares, fatores de risco tradicionais e manifestações clínico-laboratoriais do lúpus foram avaliados. RESULTADOS: a média de idade (DP) foi de 38,5 anos (11,2 anos): a maioria do sexo feminino (95,9%) e da etnia não-branca (64,5%). Identificou-se doença cardiovascular em oito pacientes (4,7%), com 11 diagnósticos diferentes. Três apresentaram evento coronariano; três, acidente vascular cerebral isquêmico; e cinco, doença arterial periférica. O fator de risco mais freqüente foi hipertensão arterial sistêmica (48,8%), seguido por dislipidemia em 70 (40,7%) pacientes e hipertrigliceridemia em 51 (29,7%). O c-LDL > 100 mg/dl foi encontrado em 77 (44,8%) pacientes. Entre as 165 pacientes do sexo feminino, 67 (40,6%) encontravam-se na pós-menopausa, e 43,3% tiveram o diagnóstico de menopausa precoce. CONCLUSÕES: o presente estudo descreve a freqüência dos fatores de risco para doença arterial coronariana em uma amostra significativa de pacientes brasileiros com lúpus. A importância do reconhecimento de tais fatores encontra-se na possibilidade de modificação e tratamento de alguns deles. O impacto da identificação e do tratamento de fatores de risco em pacientes com lúpus para prevenção de eventos cardiovasculares deve ser objeto de novos estudos.Sociedade Brasileira de ReumatologiaUFMG Faculdade de Medicina Departamento do Aparelho LocomotorUniversidade Federal de São Paulo (UNIFESP) Departamento de ReumatologiaUFMG Faculdade de Medicina Departamento de Clínica MédicaUNIFESP, Depto. de ReumatologiaSciEL

Shaping ability of Reciproc and TF Adaptive systems in severely curved canals of rapid microCT-based prototyping molar replicas

Objective: To evaluate the shaping ability of Reciproc and Twisted-File Adaptive systems in rapid prototyping replicas. Material and Methods: Two mandibular molars showing S-shaped and 62-degree curvatures in the mesial root were scanned by using a microcomputed tomography (μCT) system. The data were exported in the stereolitograhic format and 20 samples of each molar were printed at 16 µm resolution. The mesial canals of 10 replicas of each specimen were prepared with each system. Transportation was measured by overlapping radiographs taken before and after preparation and resin thickness after instrumentation was measured by μCT. Results: Both systems maintained the original shape of the apical third in both anatomies (P>;0.05). Overall, considering the resin thickness in the 62-degree replicas, no statistical difference was found between the systems (P>;0.05). In the S-shaped curvature replica, Reciproc significantly decreased the thickness of the resin walls in comparison with TF Adaptive. Conclusions: The evaluated systems were able to maintain the original shape at the apical third of severely curved mesial canals of molar replicas