International journal of physical sciences and engineering 2019-04-30T00:00:00+00:00 Prof. Joan Manuel RodrĂ­guez 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> Transposition of medium and long transmission lines 2019-03-26T06:06:27+00:00 Washington Colon Castillo Jurado Miguel Castro Fernandez Wilber Manuel Saltos Arauz Julio Cesar Hernandez Chilan <p style="text-align: justify;">The transmission lines must be balanced electric circuits, theoretically, it must be an equivalent circuit that takes into account the uniform distribution of the parameters along the line. When it comes to transporting energy over long distances it is necessary to consider the effect of the capacitance, since each phase has a different capacitance causing each line to introduce an imbalance to the electrical system, for this reason, it is necessary to study the transposition of the cables. In the present work, several simulations of transmission lines with and without transposition are made, and the voltage unbalance that occurs as the line is longer has been verified. The simulations have been carried out under conditions of balanced load and fixed voltage in the arrival bar. Using the Sim Power Systems tool from Matlab, it was possible to check the behavior of the parameters of the line, depending on the geometric layout of the structure and its length. By applying this software, the objective is achieved by checking the stress unbalance problems suffered by a transmission line when transposition is not made.</p> 2019-01-02T00:00:00+00:00 ##submission.copyrightStatement## The geoportal as strategy for sustainable development 2019-03-26T06:06:26+00:00 Maria Rodriguez Gamez Antonio Vazquez Perez Victor Alfonso Martinez Falcones Jose Javier Bravo Bazurto <p style="text-align: justify;">Ecuador is committed to venturing into the local development model based on the adequate use of endogenous resources and human potential in the community scenario; but the lack of reliable information associated with the inventory and availability of these resources in the localities does not favor the integrated participation of local actors in the planning and management of social development. The work shows what is related to the design and proposal of a geoportal for sustainable development in the province of ManabĂ­, Ecuador, based on a geographic information system that provides georeferenced data on inventories of indigenous resources and information related to technological variables that can be applied for its use. The multilayer technical design of the geoweb is exposed, which includes a map server capable of performing the georeferenced data service depending on the user's interest. The concept of development and its evolution up to the present moment is analyzed, exposing the development strategy received by the government in recent years and where an important space is foreseen for the realization of sustainable local development policies. The relevance of geographic information systems and geoweb is analyzed and some examples related to the proposed geoportal are exposed.</p> 2019-01-08T00:00:00+00:00 ##submission.copyrightStatement## Learning models and authentic assessment on football skill learning achievement 2019-03-26T06:06:26+00:00 I Wayan Artanayasa Made Kurnia Widiastuti Giri <p style="text-align: justify;">The current study was aimed at finding the effect of teaching models and an authentic assessment on football skill learning achievement by controlling motor educability. The sample consisted of 142 students of Physical Education Health Department that were selected randomly. The study used the 2x2 factorial experimental design, while the data were analyzed using 2-way ANACOVA. The results showed that after controlling motor educability, football skill learning achievement of the students who learned through the Cooperative Learning type Jigsaw model was higher than those who learned through the conventional model; the football skill learning achievement of those who were assessed by portfolio assessment was better than those who were assessed by authentic assessment. There was also an interaction between the teaching model and an authentic assessment on football skill learning achievement. The students who learned through the Cooperative Learning type jigsaw model was more appropriately assessed by portfolio assessment, while those who learned through the conventional learning model was more appropriately assessed by performance assessment.</p> 2019-03-15T16:28:30+00:00 ##submission.copyrightStatement## Harmonics influence on power and energy measurements 2019-03-26T06:06:25+00:00 Armando E. Garcia Trujillo <p style="text-align: justify;">To carry out the control and trade of electric energy, power and energy meters are used profusely. This article discusses the differences in the power and energy readings of the measuring instruments of different types and their use for the control of the quality of the supply and consumption of electrical energy. The contradictions of these readings are analyzed when measured in consumers of non-linear loads, generators of harmonics, and of linear loads, consumers of them. Simulation methods are used to show how harmonic propagation occurs in the system. MATLAB Simulink is used as a method of simulation with generating harmonics loads and linear loads. It analyzes how the parameters of the energy quality of the consumers can be affected and it is proposed to use the measurement of the active power of the harmonics as a means of control and penalization.</p> 2019-03-16T13:41:18+00:00 ##submission.copyrightStatement##