International journal of physical sciences and engineering
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Roadmap for the introduction of smart grids in Ecuador
Get PDFDistributed generation and smart grids are the reality of an efficient electricity grid, at work an analysis of the advantages that distinguish both concepts related to the scenario generation, transportation, distribution and supply of energy is provided. Some results achieved in the related study of the solar potential and wind energy, focused on the use of these resources will improve in quality future university exposed electrical service. The main elements that have been considered to be incorporated in the roadmap for the introduction of smart grids in Ecuador expose
Deflection of laminated composite plates using dynamic relaxation method
Get PDFFirst – order orthotropic shear deformation equations for the nonlinearly elastic bending response of rectangular plates are introduced. Their solution using a computer program based on finite differences implementation of the Dynamic Relaxation (DR) method is outlined. The convergence and accuracy of the DR solutions for elastic large deflection response of isotropic, orthotropic, and laminated plates are established by comparison with various exact and approximate solutions. The present Dynamic Relaxation method (DR) coupled with finite differences method shows a fairly good agreement with other analytical and numerical methods used in the verification scheme. It was found that: The convergence and accuracy of the DR solution are dependent on several factors including boundary conditions, mesh size, and type, fictitious densities, damping coefficients, time increment and applied load. Also, the DR large deflection program using uniform finite differences meshes can be employed in the analysis of different thicknesses for isotropic, orthotropic, or laminated plates under uniform loads. All the comparison results for simply supported (SS4) edge conditions showed that deflection is almost dependent on the direction of the applied load or the arrangement of the layers
Linear deflection of laminated composite plates using dynamic relaxation method
Get PDFDynamic Relaxation (DR) method is presented for the analysis of geometrically linear laterally loaded, rectangular laminated plates. The analysis uses the Mindlin plate theory which accounts for transverse shear deformations. A computer program has been compiled. The convergence and accuracy of the DR solutions of isotropic, orthotropic, and laminated plates for elastic small deflection response are established by comparison with different exact and approximate solutions. The present Dynamic Relaxation (DR) method shows a good agreement with other analytical and numerical methods used in the verification scheme. It was found that: The convergence and accuracy of the DR solution were dependent on several factors which include boundary conditions, mesh size, and type, fictitious densities, damping coefficients, time increment and applied load. Also, the DR small deflection program using uniform meshes can be employed in the analysis of different thicknesses for isotropic, orthotropic, or laminated plates under uniform loads in a fairly good accuracy
A correlational analysis of academic stress in adolescents in respect of socio-economic status
Get PDFFor students, the adolescent is a major transition in their lives since they make various decisions regarding all aspects of their lives such as academics, social life, and leisure activities. They have to struggle to meet the expectations of their parents which include desires related to their academic performance. In addition, society believes that studies with a high-rank from the reputed institute are a “passport” to a good job, high salaries, and high social status which is expected from students. As a result, the students are indirectly subjected to a variety of stressors mainly linked to academic success
Elaboration of essential oil from the oregano for medicinal use sheet
Get PDFThe extraction and industrialization of the oregano oil in Ecuador can represent an important source of work, from the harvest to the transformation of the raw material into finished product. The oregano is a plant known from many years back and has always been used for medicinal purposes and is currently being used in many fields such as perfumery, gastronomy, toiletries; But its main use is in medicine. The work proposes a methodology that allows extracting the essential oil of the plant for different medical uses such as: anti - inflammatory, analgesic, antioxidant and antibiotic, being of social benefit representing an economic impact in its industrializatio
A theoretical study of performance measures in the strategic and corporate entrepreneurships of firms
Get PDFThis paper compares performance measures in the corporate and strategic entrepreneurial activities of firms. The paper develops the concepts of strategic entrepreneurship and that of corporate entrepreneurship with the aim of identifying the measures suitable for determining their “end-points” and hence, performance, with respect to the firm’s activities. The paper concludes the performance measures for both entrepreneurial processes need to consider and exploit the salient differences in their operations. When this is done, a “balanced” picture of the firm’s strategic as well as corporate entrepreneurial performance that aligns itself with the dynamic environment, operational processes and stakeholders and such that can enhance continuous improvement will be attainable
Reflections on the implementation of tidal energy in Ecuador
Get PDFRenewable energy is a topic frequently discussed due to the need to change the forms of generation, from the centralized to the distributed form and take advantage of the potentials that are scattered in the territory and use local resources and thereby diversify the schemes of distributed generation that allows the man in his daily work to pass from consumption of energy to generator, in this way the environmental impacts are reduced that today accelerate the change of temperature in the planet, noticing in recent years the oil and its derivatives are responsible for this phenomenon. The objective of the research is to reflect on tidal energy, knowing that the province of Manabí, is the one that has the largest coastal area and where there is a potential that can be studied for future use
Microgrid with a 3.4 kWp photovoltaic system in the Universidad Técnica de Manabí
Get PDFThe emergence and development of Microgrids emerge as an alternative to the distributed generation that is becoming more and more effective at an international level. The research aims to perform an analysis on the behavior of a microgrid designed in an urban environment operating connected to the main electrical network or outside it. A technical evaluation of the connected photovoltaic power plant is carried out as a microgrid obtaining as a result the improvement of the profiles of voltage, current and apparent power, at the same time that it favors the reduction of the electric energy consumption of the conventional network, with the potential to decrease The amount of the electric bill, contributing to the reduction of oil consumption and CO2 emissions to the atmosphere
Aquifers selection to aid geoelectrical methods on drilled well building near the beach
Get PDFThe aquifer was a rock form wherein the water was collected and as well as able to release water economically. The aquifers near the beach were susceptible to intruded sea water, especially areas that have a lot of groundwater taking, therefore, if building a well, should be chosen aquifer that had not been intruded sea water. It was needed a way thus, the water taken is not salt water or brackish water. This study has a long-term goal of finding a way to choose aquifer by geoelectric method aid. In order to build a drilled well, for getting the right aquifer. The research had been conducted in Candidasa Karangasem Bali with the geoelectric method. The results showed that there were two aquifers types, i.e. free aquifer with resistivity was 33.9 ohm.m and distressed aquifer with a resistivity was 70 ohm.m. Taking into account the two resistivity magnitudes, then, the free aquifer was thought to have been intruded by the sea water, while the distressed aquifer was thought to have not been intruded by sea water