International journal of physical sciences and engineering 2019-10-21T14:19:27+00:00 Prof. Joan Manuel Rodríguez Diaz, Ph.D. Open Journal Systems <p style="text-align: justify;"><strong>IJPSE</strong>&nbsp;is published in English and it is open to authors around the world regardless of the nationality. It is currently published three times a year, i.e. in&nbsp;<em>April</em>,&nbsp;<em>August</em>, and&nbsp;<em>December</em>.&nbsp;&nbsp;</p> Design of eco-friendly refrigeration system 2019-10-21T14:19:27+00:00 Ricardo Fabricio Muñoz Farfán Telly Yarita Macías Zambrano Víctor Manuel Delgado Sosa Vicente Zambrano <p style="text-align: justify;">The present study of a freezing system has developed based on an air conditioning system, whose purpose is to take advantage of the technological transfer of cold producing equipment for food storage and conservation uses. The installed capacity of 9000 BTU/Hr was considered for the choice of equipment. We studied the freezing process of fish, water, and the preservation of legumes with a volume of 1 kg per product individually. The freezing temperature has evaluated with a mechanical compression refrigeration system of Gas R22 with temperature interactions of 29.6 ° C to -12 ° C. and monitored with a Proportional Integrative Derivative (PID) controller. For production cost, the equipment was mostly made of its parts and pieces with recycling material. A descriptive experimental design has carried out, for the verification of results. The equipment managed to reach chamber temperatures of -13 ° C from 20 minutes once the equipment (compressor) has turned on under specific product descriptions.</p> 2019-05-14T03:21:10+00:00 ##submission.copyrightStatement## Comparative Study on NDVI with RVI for Estimated Area and Class Distribution 2019-10-21T14:19:26+00:00 I Made Yuliara Ni Nyoman Ratini I Gde Antha Kasmawan <p style="text-align: justify;">This study aims to determine the differences and comparison of the results of the estimated area, the distribution of clove vegetation using the <em>Normalized Difference Vegetation Index (NDVI) </em>and <em>Ratio Vegetation Index (RVI)</em> and to choose a vegetation index that is more suitable for clove vegetation analysis in Buleleng district, Bali. The method used is to compare statistically descriptive area and distribution class produced by the NDVI and RVI models with area data from the Forestry and Plantation Service (FPS), Buleleng regency, Bali in 2014, amounting to 7622.32 ha. The estimated area of ??clove vegetation by the NDVI model was 7852.68 ha and the RVI model was 7669.44 ha. There is an estimated difference in the area of ??clove vegetation of 183.24 ha and a difference in the broad class category of 2453.85 ha for the Rare class (NDVI &gt; RVI) category, for the Medium class of 1611.45 ha (RVI &gt; NDVI), and for the Dense class of 659.16 ha (RVI &gt; NDVI). Comparison of the area with FPS data obtained 97.07% for the NDVI model and 99.39% for the RVI model. This shows that the RVI model vegetation index is more suitable for use in the estimation of the area and class of clove vegetation distribution in Buleleng regency, Bali.</p> 2019-08-12T09:07:59+00:00 ##submission.copyrightStatement## Technical-economic impact of low voltage secondary lines to pre-assembled 2019-10-21T14:19:26+00:00 Steven Ruben Briones Giler Carlos Javier Sailema Loor Jean Carlos Maciás Moreira Bryan Alexander Muñoz Zambrano <p style="text-align: justify;">Distributed generation is understood as all those sources of electrical energy that are connected in the electricity distribution networks. These distribution networks have been planned with wide operating margins, which together with the characteristic that energy flows are unidirectional (from the substation to consumers) allow them to be operated passively. This means that they are not subject to constant monitoring of the network status variables (ie voltages, flows), so these networks are managed with little supervision since that is more economical. The objective of this research is to investigate the economic impact that is presented within the university for a better presetting in the low voltage lines for them, the causes and effects that can be committed when installing them have been investigated, in addition to making a bibliographic review of how in other countries and within our city Portoviejo is distributed in low voltage and its consequences or benefits.</p> 2019-08-29T01:15:46+00:00 ##submission.copyrightStatement## The brain and its role on learning process 2019-10-21T14:19:25+00:00 Maria Antonia Velez Tuarez Ronald Ivan Zamora Delgado Olga Viviana Torres Teran Maria Elena Moya Martine <p style="text-align: justify;">This article provided a brief analysis of an important human organ and the influences it has on personal and formal learning in the educational field. The specific topics that were investigated are the brain and its importance in learning, characteristics of the hemispheres of the brain learning and the contribution of neuroscience in the teaching-learning process. The first topic mentions how the brain influences learning and the role of memory in that process. The next topic focuses on the characteristics and functions performed by the two brain hemispheres. The latest content deals with the contribution of neuroscience in the educational field, here is detailed on how neural networks combined with the environment where the student performs to make learning possible. The descriptive methodology, based on the review of current bibliographic sources, was used. The purpose of this document is to provide the reader with true and up-to-date sources of information on an organ that integrates complex and necessary ideas for the human being.</p> 2019-08-29T04:26:09+00:00 ##submission.copyrightStatement## Photovoltaic system proposal for a house 2019-10-21T14:19:25+00:00 Antonio Vázquez Pérez Pérez Ciaddy Gina Rodríguez Borges Borges Jesús Alberto Pérez Rodríguez Rodríguez <p style="text-align: justify;">This work shows the design project of a photovoltaic system to power a home, based on a demand study and its general characteristics, the area available for the assembly was considered of the modules, the geographical location and the meteorological data of the place. With this information, the pertinent calculations were made to ensure that the installation provides the energy necessary to cover the consumption of the home and that it also delivers the surplus energy to the network. PVsyst software was used for the design of the photovoltaic system. To verify the advantages of the implementation of the photovoltaic arrangement, the benefit-cost ratio was evaluated, carrying out an environmental impact analysis taking into account the reduction of CO2 emissions into the atmosphere and the tons of fossil fuel stopped burning when generating electricity with This source of energy. It is convenient to install.</p> 2019-08-30T00:00:00+00:00 ##submission.copyrightStatement##