Reviewerly/exHarmony huggingface dataset:
ESTIMATIVA DO GANHO PROPORCIONADO COM O USO DE SEGUIMENTO SOLAR PARA FORTALEZA/CE

One of the technical restrictions on the dissemination of solar projects is the low efficiency of photovoltaic systems, which promotes a search for alternatives to maximize the use of solar irradiation in these systems. Among these alternatives is the use of solar tracking, which causes the solar capture surface to face the sun, following its movement and thereby capturing more irradiation. Thus, in the present work, using solar irradiation data on the horizontal plane measured by a pyranometer installed at the Alternative Energy Laboratory (LEA) of the Federal University of Ceará (UFC) in Fortaleza/CE, an estimate is made of the irradiation values that would be collected by a fixed surface with a certain inclination to the horizontal and a surface with the same inclination and with solar tracking from east to west, both in the same location. The results show that with the use of solar tracking a gain in solar radiation captured of 8.2% is obtained on annual average, reaching a maximal value of 12.7% on monthly average.
CARACTERIZAÇÃO DA EFICIÊNCIA BRASILEIRA DE INVERSORES PARA SISTEMAS FOTOVOLTAICOS CONECTADOS À REDE

This paper presents a proposition of quantifying grid connected PV inverters efficiency in Brazil. European and CEC Efficiencies have been used as comparison basis between inverters, but the weighting factors used on their calculations do not reflect the characteristics of Brazilian solar incidence. In this sense, this paper proposes an improvement in the way of calculating a weighted efficiency, considering the characteristics of Brazilian solar incidence, updating the concept of Brazilian Efficiency for PV grid-connected inverters.
COMO OTIMIZAR A PRODUÇÃO E A EFICIÊNCIA DE USINAS FOTOVOLTAICAS COM O USO DE RASTREADORES SOLARES

Maximizing return on investment is the primary goal for ground-mounted solar plant developers, owners and IPPs. Achieving these objectives requires a combination of intelligent energy yield optimization, smart plant configuration and perfected industrial design. Implementing solar trackers - motorized structures that orient photovoltaic panels toward the sun in order to collect more direct sunlight throughout the day -, solar plant output can be increased up to 30% in high solar radiation areas, such as some areas in Brazil. Through a case study on a PV plant project in the state of Pernambuco and best practices carried out by solar tracker expert Exosun, the article demonstrates the benefits of solar trackers in comparison with fixed-tilt installations. After proving that solar trackers considerably increase the output and revenue of a PV plant, the article then outlines how to configure a tracker-equipped plant in the best possible way in order to reduce capital expenditure and further boost output, by considering the GCR (Ground Coverage Ratio) and tracker orientation.
ESTIMATIVA DA VARIABILIDADE DO BOMBEAMENTO D’ÁGUA EM SISTEMA ACIONADO POR ENERGIA FOTOVOLTAICA NA CIDADE DE BOTUCATU-SP, PARA O ANO DE 2014

Evaluations in environments of water pumping systems moved by solar photovoltaics are necessary when the aim is to test the performance of this systems. When the system evaluations are performed from experimental works it is possible to have the called characteristic bends of operation. This work reports the procedure of obtaining of the regression equations of characteristic bends of operation referred to evaluations of two water pumping systems with a charge subtraction of 13,5mca - charged directly by photovoltaic panels. The systems were evaluated at farm-model of the College of Agronomic Science, UNESP/Botucatu-SP in which was obtained the regression equations through the analysis of the performance bends. As part of results were performed variability estimates of volume of the water pumping monthly employing the regression equations in function to the daily irradiance for 12 months of 2014. The daily average of the water pumping experimental if compared to values obtained with the regression bends of each setup showed relative deviations near to 1 percent.
AVALIAÇÃO DE UM SISTEMA FOTOVOLTAICO SOB A ÓTICA DA TECNOLOGIA E DA LOCALIZAÇÃO GEOGRÁFICA

This article aims to evaluate two photovoltaic systems in two cities located in different climatic zones in Brazil, to verify the sensibility of the Return on Investment (ROI) to the climatic conditions. The two systems are placed in residences for which the electrical demands are modeled as a function of the electric loads and the number of people. The electrical demands define the characteristics of the two PVs whose primary goal is to decrease the monthly expenses for the use of electricity, under the perspective of the final user. The results show that the ROI depends on the environmental conditions of the chosen location, and on the electricity tariffs that are charged by the distribution utilities. The chosen technologies have a very limited influence on the economic results.
ESTUDO DA RADIAÇÃO SOLAR DA CIDADE DE PETROLINA ATRAVÉS DE UM MODELO EMPÍRICO DE CÉU CLARO

In this paper, a study of the solar resource characteristics in the city of Petrolina was made using an analysis of the quantity of clear sky days, which is relevant for projects of thermal or photovoltaic solar power plants. SONDA station provided the solarimetric data. An empirical clear sky model for the region was developed by adjusting the extraterrestrial solar irradiance curve to the global solar irradiance data curve. Using the values of the estimated global solar irradiance, for all days of the database, the value of a constant Kc, which represents the relation between the global solar irradiance data and the estimated solar irradiance for clear sky. It was assumed that days with Kc higher than 0.94 should be considered as clear sky days. Subsequently, the monthly and annual distribution of the values of Kc was determined based on the frequency of the values of this constant. A similar method was utilized for the city of Recife. With the annual distribution of Kc for Recife and Petrolina, comparisons was made between these cities and it can be seen that the city of Petrolina has a higher quantity of clear sky days due to its climate characteristics of low precipitation.
MÉTODO PARA CÁLCULO DA PROPAGAÇÃO DE INCERTEZAS NA ESTIMATIVA DA GERAÇÃO DE ENERGIA DE SISTEMAS FOTOVOLTAICOS

In recent years, the photovoltaic market in Brazil is maturing and thus, investment growth in the sector and consequently large solar power plants projects or through distributed generation. So increasingly, investor confidence will depend on the energy forecast generated by these photovoltaic systems particularly in performance contracts. Thus, for the realization of the same, a sequence of energy conversion and insertion of parameters is required in a process of mathematical modeling of the system, and each of these are related to a particular type uncertainty. The uncertainties in these models, increase from several sources and consequently, these uncertainties contribute to the overall uncertainty in predicting the system power production. Therefore, in this work, uncertainties are identified, described and quantified by a simple statistical method however, consistently, to calculate the propagation of uncertainty in power generation. This method was implement in MATLAB © and applied to a two micro PV generators installed in different locations.
EL RECURSO SOLAR TEORICO Y EXPERIMENTAL EN LA CIUDAD DE CATAMARCA

The work shows results of measurements of global solar radiation data on horizontal plane, using equipment located at the National University of Catamarca and a comparative study with values obtained from other sources. The measuring device is constituted by a LI-200 associated with a pyranometer LogBox - AA-32K-IP65 programmed to automatically store data every ten minutes. Calibration of the Pyranometer is performed in the Department of Physics at National University of Salta and installed in the city of San Fernando del Valle de Catamarca. The equipment began operations in August 2014, and now we have data from a year. The device works properly and it is located in a safe place without accidental shaded. It shows some preliminary results and graphics.
AVALIAÇÃO DO DESEMPENHO DE UM SEGUIDOR SOLAR MONOAXIAL PARA SISTEMAS FOTOVOLTAICOS ISOLADOS

The Northeast region of Brazil presents favorable conditions for photovoltaic solar energy harvesting because its favorable location close to the equator, and because there are few variations in average solar radiation throughout the year. This article presents the results of a comparative study of electricity production for a stationary photovoltaic systems facing true north at 15 degrees to the horizontal plane, and a mobile system associated with a monoaxis solar tracker. The evaluation was performed at intervals of angular positions of 15, 30 and 60 minutes using the solar tracker in two configurations: open loop and closed loop control. An average irradiance day was selected to evaluate each system at different intervals and angular position. Was observed an increase of 27.42% in the performance of electricity generation of the solar tracker system for angular position intervals of 60 minutes in closed-loop.
ESTIMAÇÃO DE PARÂMETROS PARA MODELAGEM DE PAINÉIS FOTOVOLTAICOS UTILIZANDO ALGORITMO DE LEVENBERG

This article proposes a method of estimation of parameters for simulating photovoltaic panels. The model used to represent the photovoltaic panel is based on a diode and two resistors. A contribution of this work is the estimation of parameters (parallel and series resistance) of the photovoltaic panel through an algorithm that minimizes the square error of the obtained curve with the real I-V characteristic curve. The real curve is sampled from the datasheet including some provided points (short circuit current, open circuit voltage and maximum power current and voltage). We propose in this work a variation of the Levenberg-Marquardt algorithm for minimizing the error between the curves and, at the same time, passing through the maximum power point of the photovoltaic panel. The results of the proposed algorithm for the model parameters are compared with those of other studies in the literature. The effectiveness of this approach is also validated by comparing the obtained I-V curve with the real curve and those provided by other models from the literature. Finally, the results related to the photovoltaic module's behavior with the estimated parameters are presented.
IMPACTOS DO DESALINHAMENTO DOS SISTEMAS DE RASTREAMENTO SOLAR EM SISTEMAS COM ALTA CONCENTRAÇÃO

The paper presents the analysis of the impact of power generation caused by misalignment between the physical structure of the tracker and the sun's rays. It was used as an object of study the Photovoltaic system of high concentration ( HCPV - High Concentrator Photovoltaics) installed by the Group for Alternative Energy Sources (FAE) in the Department of Nuclear Energy (DEN) at the Federal University of Pernambuco (UFPE). Through the measurements it was possible to quantify the decay of power generation in the system output due to the increase in deviation angle between the normal vector to the generator of the plan and the sun's rays. This document presents the main features of HCPV system used, the implemented methodology and a description of a pointing sensor that was developed the experiment.
RELAÇÃO ENTRE A VARIABILIDADE DA PRECIPITAÇÃO E A DISPONIBILIDADE DE IRRADIAÇÃO GLOBAL HORIZONTAL SOBRE A CIDADE DE NATAL

This study analyzes global horizontal irradiance series for the months of June and November of the years 2009, 2010, 2011 and 2012 and its variability associated with the pattern of rains during the same period in the city of Natal-RN. The analysis allowed to verify that June 2010 showed the highest level of irradiation and June 2011 the smallest, 5.31 kWh/m²day and 4.31 kWh/m²day respectively. The months of November 2010 and 2011 also showed the highest and the lowest levels of irradiation 7.30 kWh / m²dia and 6.85 kWh / m²day. It was concluded that even in periods considered quite rainy, the city of Natal also has enough solar resource for the use and generation of electricity.
DESENVOLVIMENTO DE UM SISTEMA DE CONTROLE PARA UM RASTREADOR SOLAR DE ALTA PRECISÃO

The use of solar concentration systems in order to increase the amount of energy incident on a surface absorber, both in a photovoltaic or thermal conversion, requires the use of tracers. This paper presents the development of a system of closed loop control to operate a solar rastreador with deviations smaller than 0,1°. The control system utilizes an algorithm to compute high-precision location of the sun, where the absorbing surface is offset in relation to the sun position, the control device operates the drive of the mechanical structure of the crawler to perform the alignment. For measuring the position of the mechanical structure, two axes of encoders installed at the zenith and azimuth positions were used. The control system was developed with a programmable logic controller in conjunction with a supervisory system are responsible for all the logic of the control equipment. Several tests were conducted to evaluate the performance of screening. In all tests the result was satisfactory. For data acquisition, we developed a database that works in conjunction with the supervisor. The measurement of angular deviation between the structure of the tracker and the rays of the sun sensor pointing, which aims to detect the misalignment condition was developed. The results found with the sensor showed that the developed control system to the crawler kept below the set deviation (0.1°) during most of the time (91.25 % of the measurements) which was analyzed. The control system developed using only national technology in its development, with an estimated initial cost quite favorable.
AVALIAÇÃO DO ALGORITMO SEQUENTIAL MINIMAL OPTIMIZATION (SMO) NA ESTIMATIVA DA FRAÇÃO TRANSMITIDA DA IRRADIAÇÃO DIRETA NA INCIDÊNCIA NORMAL (ktbd)

In this work, the Sequential Minimal Optimization (SMO) algorithm is used to estimate the beam solar fraction at normal incidence transmitted on terrestrial surface (ktbd). The Radial Basis Function (RBF) kernel is used for regression. The statistical model (#M3) is developed and compared with the model (SMO3). The input variable used is the insolation ratio (n / N) [n is the sunshine and N the photoperiod]. 13 years of measurements were used to Botucatu - SP region. Two named database typical year (AT) and atypical year (AAT), selected of the total base of 13, are used to validate the models. In the evaluation of the models were used: Relative Mean Bias Error (rMBE), Relative Root Mean Square Error (rRMSE), percentage relative error (℮) and Willmott index of agreement (d). The SMO3 has better accuracy than the model (#M3). The validation with AT and AAT was satisfactory. Finally, SMO3's performance in the wet and dry season is analyzed to verify the influence of clouds, aerosols and water vapor in the dispersion of estimates and increased in the errors. The SMO estimated ktbd with better precision and can be used.
Title Pending 739

Over the last decade, significant changes have affected the work that data repositories of all kinds do. First, the emergence of globally unique and persistent identifiers (PIDs) has created new opportunities for repositories to engage with the global research community by connecting existing repository resources to the global research infrastructure. Second, repository use cases have evolved from data discovery to data discovery and reuse, significantly increasing metadata requirements.To respond to these evolving requirements, we need retrospective and on-going curation, i.e. re-curation, processes that 1) find identifiers and add them to existing metadata to connect datasets to a wider range of communities, and 2) add elements that support reuse to globally connected metadata.The goal of this work is to introduce the concept of re-curation with representative examples that are generally applicable to many repositories: 1) increasing completeness of affiliations and identifiers for organizations and funders in the Dryad Repository and 2) measuring and increasing FAIRness of DataCite metadata beyond required fields for institutional repositories.These re-curation efforts are a critical part of reshaping existing metadata and repository processes so they can take advantage of new connections, engage with global research communities, and facilitate data reuse.
GAP FILLING DE DADOS SOLARIMÉTRICOS UTILIZANDO REDES NEURAIS ARTIFICIAIS

Regarding solar radiation measurements within a given area, it is common to get gaps in the parameters which have been measured and stored in a technical data base. In order to avoid such a situation, it is of relevance to fill these gaps by estimating parameters with the use of a technique that applies a computational interconnected structure of processing units – the Artificial Neural Network (ANN) . The technical paper presents a method to estimate the solar radiation in a site by using an Artificial Neural Network technique with Multilayer Perceptron (MLP). The method considers the supervised learning technique known as back-propagation. It has been analyzed ground data measurements in an area sited in São José do Belmonte, in the semiarid region of the State of Pernambuco, Brazil. The use of the model presented good preliminary results and will be improved and tested in other sites which have been chosen as candidates for installing solar power plants in the near future.
ANÁLISE DE RISCO PARA O INVESTIMENTO EM GERAÇÃO DISTRIBUÍDA FOTOVOLTAICA

This paper presents a methodology for risk assessment in investments in photovoltaic microgeneration in the context of the energy compensation mechanism defined in the Brazilian regulatory acts 482/2012 and 687/2015 from ANEEL, considering the uncertainty about the parameters that define the discounted cash flow of the investment. The analysis is based on a discounted cash flow model and in the v-NPV. Moreover, the internal rate of return-IRR, Payback and levelised cost of energy-LCOE are also analyzed. The sources of uncertainty involved in the decision-making process are characterized using triangular probability distributions that are input to the Monte Carlo simulation method. Results for investments in microgeneration in the Belo Horizonte region are presented. Significant favorable conclusions for investments in photovoltaic microgeneration are obtained.
Looking at the impact of digital revolution in school education: considerations and insights

Aim. The necessary renewal of teaching methods and school practices must take into consideration the technologies of the new generations of students, for whom the supremacy of the book and of the alphabetic writing is no longer given for certain. The presence of digital natives paves the way for educators to increase the digital awareness of young people, primarily through the definition of the terms of a new digital literacy. The reflection on the experiences of applying Web 2.0 tools to the educational context highlights the growing importance of participatory culture and informal learning.&#x0D; Methods. An important role is played by an updated use of constructivist and connectivist pedagogical perspectives. Training courses are considered for the person of the e-learning tutor. Among the specific objectives we have the diffusion of Computer Mediated Communication (CMC), the deepening of Web 2.0 environments, the introduction of cooperative work and constructivist management methods of online interaction, the use of moderation techniques in e-learning environment. These objectives refer to the context of teaching, staff training and school organisation.&#x0D; Results. The collected results are processed using computerised statistical and text analysis systems, which highlight the most central themes and the most evident correlations between the emerging evidence. People who follow training courses of this type show greater awareness of the use and usefulness of technologies. They acquire awareness of the challenges posed by the growth of the young generation of digital natives, in terms of activating a new digital literacy.&#x0D; Conclusions. The research also highlights the difficulties and disappointments encountered in dealing with users and with the school authority. Attending training courses of this type significantly underlines the existence of two distinct fundamental methods of approaching the introduction of new media: one of technologising type, in which technologies are seen indicatively as an end, and one of culturalising type, in which technologies are seen as a means.
ESTRATÉGIAS DE COLEÇÃO SOLAR PARA SISTEMAS FV PLANOS

The advantages of solar tracking are well known in terms of energy harnessing. The usage of such systems, can increase, for instance, about 20% the total collected energy in typical sites and about 30% in areas of high direct solar irradiance incidence. On the other hand, by means of massive electronic components production, the technology became less expensive which resulted in the emergence of hundreds of solar trackers in the world market, with several accuracy degrees and tracking strategies. In this scenario, the main proposal of this approach is the development and evaluation of a single axis multiple tracking system without concentration that can accomplish 03 different tracking strategies: (0) fixed polar mount, (1) continuous tracking and (2) tracking by division of the total daily tracking angle in seven discrete intervals. All the strategies shared the same time window of one minute to execute their tasks. The gains of strategies (1) and (2) when compared to the fixed polar position, strategy (0), had the expected values taking in account the weather conditions of the period. The tracking angle errors were low for the purposes of the experiment, below 0.1° on average. It was concluded that there were no significant differences in the power output between the tracking strategies (1) and (2), even though (2) uses only 07 discrete movement intervals a day.
CORRELAÇÃO E ANÁLISE ESTATÍSTICA DE DADOS SOLARIMÉTRICOS ATRAVÉS DE IMAGENS DE SATÉLITE E ESTAÇÃO SOLARIMÉTRICA PARA A REGIÃO DA CIDADE DE JAÍBA - MG

In this paper, the correlation and statistical analysis of solarimetric data using information from Solarimetric station and satellite images is presented to the city of Jaíba-MG in order to demonstrate their differences and advantages to using both databases for better use of solar resource in the locality and quality database training, poor information in the region, where a photovoltaic solar plant (UFV) with installed capacity of 3 MWp, with different technologies, will be installed and hence get a better estimate of energy production and return of the solar project investment.
PROGRAMA PARA O CÁLCULO DE RADIAÇÃO SOLAR

This paper presents a computer program developed by the authors to calculate the solar radiation variation during the year in an arbitrary location on Earth. Simulated results are presented for Belém, Brazil. Comparisons with measured data of solar radiation were made available by the National Institute of Meteorology (INMET), which takes into account momentary effects of cloudy sky. The analysis of the simulated and measured results allows us to estimate the local reduction on the incident solar energy during the year due to cloudiness. The measured radiation database is for the year 2014. From the joint analysis of simulated and measured data, the solar energy potential of the site was evaluated during the year, where it revealed a correlation of lower nebulosity periods with the rise in measured radiation index, which allows identifying seasons that favors a better electric power output from photovoltaic panels