bluuebunny/crossref_metadata_2025_split huggingface dataset:
Desempenho na estimativa de precipitação pelo radar meteorológico do oeste de Santa Catarina
Authors: José Murilo Fretta , Minuzzi Rosandro Boligon 
Published: January 2020

Apesar da sua eficiência, o radar meteorológico apresenta erros que são sensíveis às calibrações e às físicas envolvidas nos sistemas naturais. O objetivo neste estudo foi analisar o desempenho na estimativa de precipitação pelo radar meteorológico do oeste (RMO) de Santa Catarina em diferentes escalas de tempo. No período de 6 outubro de 2017 à 31 de janeiro de 2018, foram comparados dados de precipitação acumulados (> 1 mm) em 10 minutos, 60 minutos e 24 horas por nove estações pluviométricas com as estimadas pelo radar. A avaliação da estimativa de precipitação pelo RMO foi realizada por meio do coeficiente de correlação, o Erro Médio, o Erro Padrão de Estimativa, os Índices de Concordância e de Confiança e pela Eficiência de Nash-Sutcliffe. Para os acumulados em 24 horas e 60 minutos o radar tende a superestimar a precipitação em média de 5,82 mm e 1,62 mm, com um desempenho considerado ‘muito bom’ e ‘mediano’, respectivamente. Para a precipitação de 10 minutos os resultados foram diversificados e com um desempenho ‘ruim’. Como o desempenho do radar tende a diminuir quanto menor a escala de tempo de estimativa de precipitação a calibração do RMO se faz necessário. Performance in precipitation estimation by meteorological radar in the West of Santa Catarina A B S T R A C TDespite its efficiency, weather radar has errors that are sensitive to the calibrations and physics involved in natural systems. The objective of this study was to analyze the performance in the estimation of precipitation by the Meteorological Radar of the West (MRW) of Santa Catarina at different time scales. In the period from October 6, 2017 to January 31, 2018, accumulated precipitation data (> 1 mm) were compared in 10 minutes, 60 minutes and 24 hours for nine rainfall stations with those estimated by radar. The MRW estimation of precipitation was performed using the correlation coefficient, the Mean Error, the Standard Error of Estimation, the Concordance and Confidence Indexes, and the Nash-Sutcliffe Efficiency. For the accumulated in 24 hours and 60 minutes the radar tends to overestimate the average precipitation of 5,82 mm and 1,62 mm, with a performance considered 'very good' and 'medium', respectively. For the 10 minute rainfall the results were diverse and with 'poor' performance. As the radar performance tends to decrease the lower the time scale of precipitation estimation the MRW calibration becomes necessary.Keywords: calibration, remote sensing, hidrological station.
Repercussão da Exploração Hidroelétrica no Funcionamento Geoecológico de Paisagens Fluviais Amazônicas
Authors: De Paula Eder Mileno Silva 
Published: January 2020

A exploração hidroelétrica promove impactos naturais e sociais irreversíveis, também observados nas bacias hidrográficas amazônicas que receberam as Usinas Hidrelétricas de Balbina, Tucuruí e Samuel. A Usina Hidrelétrica de Belo Monte (UHEBM) está sendo construída desde 2011 no Baixo Curso do Rio Xingu e começou a produzir energia elétrica no ano de 2016. Os barramentos construídos para UHEBM impactam na dinâmica do fluxo fluvial de energia, matéria e informação do Rio Xingu, com desdobramentos negativos para o meio biótico, abiótico e para as comunidades indígenas, ribeirinhas e urbanas locais. Nesta pesquisa teve-se objetivo de analisar as consequências da exploração hidroelétrica no funcionamento das paisagens fluviais no Baixo Rio Xingu, através de análises geossistêmicas dos componentes das paisagens. Analisou-se o funcionamento antes do início do represamento da água (1985 a 2014) e após o represamento do Xingu (2016 a 2019). As conclusões indicam como se dá o funcionamento geoecológico de rios amazônicos explorados por hidrelétricas, especificamente aqueles com trechos de vazão reduzida. Essas conclusões podem contribuir no planejamento e gestão ambiental de paisagens fluviais e ajustes na operação da UHE Belo Monte. Repercussion of Hydrielectric Exploration in the Geoecolocical Performance of Amazon Fluvian Landscapes ABSTRACT Hydroelectric exploitation promotes irreversible natural and social impacts, also observed in the Amazonian basins that received the hydroelectric plants of Balbina, Tucuruí, and Samuel. The Belo Monte Hydroelectric Power Plant (UHEBM) is in construction since 2011 in the low-lying region of the Xingu River and started producing electricity in the year 2016. The dams built for the UHEBM impact on the dynamics of the river flow of energy, matter and information on the river Xingu with negative consequences for the biotic and abiotic environment, and for the indigenous, riverside and urban communities. The research’s objective was to analyze the consequences of hydroelectric exploitation on the river landscape in the lower Xingu River through geosystemic analysis of landscape components. The operation was analyzed in the period before the beginning of the water dam (1985 to 2014) and after (2016 to 2019) the damming of Xingu. The conclusions indicate the geoecological functioning of Amazonian rivers explored by hydroelectric plants, specifically those with reduced flow stretches, and these conclusions can contribute to the planning and environmental management of river landscapes and adjustments in the operation of the Belo Monte Hydroelectric Power Plant. Keywords: Belo Monte, Volta Grande do Xingu, Hydrogeography, Fluvial Geomorphology.
Métodos baseados em temperatura do ar para estimativa de radiação solar incidente diária no Estado do Rio de Janeiro
Authors: Mazzarella Desirre Santos , Wanderley Henderson Silva , Oliveira Júnior José Francisco de , Gois Givanildo , Lyra Gustavo Bastos 
Published: January 2020

A radiação solar global (Rs) é um parâmetro de entrada necessária para estimativa da evapotranspiração e em modelos de crescimento, desenvolvimento e simulação do rendimento das culturas. Em locais com ausência de dados de Rs, podem ser utilizados métodos empíricos em função dos extremos de temperatura do ar para sua estimativa. No estado do Rio de Janeiro, estudos sobre Rs com base em métodos empíricos são escassos. Portanto, o objetivo foi estimar Rs diária com base no método de Hargreaves-Samani (HS) por meio de dados da amplitude térmica diária de 11 estações meteorológicas automáticas na escala bianual (2013-2014). O desempenho do método HS com o coeficiente proposto por Hargreaves (1994) e calibrado por Allen (1995) foi avaliado com indicadores estatísticos. O coeficiente R² variou entre 0,30 a 0,85, seguido do índice d entre 0,58 a 0,95 e do índice c entre 0,32 a 0,87, classificados como “Péssimo” a “Ótimo”. O erro absoluto variou de -6,23 a 7,09 MJ m-2 d-1 e o RQME 2,98 entre 8,69 MJ m-2 d-1. Baseado nos resultados o coeficiente proposto por Hargreaves (1994) resulta em estimativas precisas em comparação ao calibrado por Allen (1995), com ressalva das estações costeiras. Methods based on air temperature to estimate daily incident solar radiation in Rio de Janeiro State A B S T R A C TGlobal solar radiation (Rs) is a necessary input parameter for estimating evapotranspiration and in crop growth, development and simulation models. In places with no data of Rs, empirical methods may be used as a function of the extremes of air temperature for their estimation. In the state of Rio de Janeiro, studies on Rs based on empirical methods are scarce. Therefore, the objective was to estimate daily Rs based on the Hargreaves-Samani (HS) method using data from the daily thermal amplitude of 11 automatic meteorological stations on a biannual scale (2013-2014). The performance of the HS method with the coefficient proposed by Hargreaves (1994) and calibrated by Allen (1995) was evaluated with statistical indicators. The R² coefficient ranged from 0.3 to 0.85, followed by the d index between 0.58 to 0.95 and the c index between 0.32 to 0.87, classified as "Poor" to "Great." The médium erro ranged from -6.23 to 7.09 MJ m-2 d-1 and RMSE 2.98 to 8.69 MJ m-2 d-1. Based on the results, the coefficient proposed by Hargreaves (1994) results in more accurate estimates compared to the one calibrated by Allen (1995), with the exception of the coastal stations.Keywords: meteorological parameters, atmospheric transmissivity, thermal amplitude.
Responsabilidad social corporativa en la rentabilidad empresarial
Authors: Obando Changúan Marcelo Patricio , Sandoval Colina Nathaly Evelyn , Ruiz Parrales Evelyn Concepción , Montiel Díaz Práxedes América 
Published: January 2020

En la actualidad el concepto de responsabilidad social ha evolucionado rápidamente, presentando un interés significativo en prácticas responsables, cuidando la reputación de las empresas. Se la conoce como el aporte al mejoramiento social, ambiental y económico por parte de las compañías con el propósito de mejorar su prestigio.
El objetivo de esta investigación es determinar la responsabilidad social y el rendimiento financiero comparando las 10 mejores empresas del Ecuador durante el periodo 2018. Se utilizó una investigación de tipo descriptiva y se basó en un análisis mixto en donde se consideró un análisis cualitativo enfocado a la interpretación de los aspectos de responsabilidad social en las empresas ecuatorianas. Los resultados obtenidos muestran un análisis descriptivo de las compañías evaluadas y ofrecen una visión más amplia de la rentabilidad e índices comparativos de las mismas. Como conclusión se puede determinar que la RSC es un concepto clave para la sostenibilidad y los gerentes deben entender que informar las actividades trae beneficios a los interesados y a la empresa.
A kinetic study of esterification of naphthenic acids from a Colombian Heavy Crude Oil
Authors: Quiroga-Becerra Haydée 
Published: January 2020

This article presents the kinetic study of the esterification reaction of naphthenic acids from a Colombian heavy crude oil, with a Total Acid Number (TAN) of 7,33 mgKOH/g, in a batch type reactor. Temperature was changed between 150 - 250°C while the ratio moles of methanol per mole of carboxylic groups, remained constant in 20:1. The reaction time was varied from 0 - 600 minutes. Reduction in the concentration of naphthenic acids in the reactor is determined by the measurement of Number Total Acid (TAN), ASTM D 664. Naphthenic acids were extracted from the crude and structurally characterized by Fourier Transform Infrared Spectroscopy (FTIR), Nuclear Magnetic Resonance (NMR) and Gel Permeation Chromatography (GPC).
The esterified oil was analyzed by FTIR, to identify the variation of the main functional groups. After determining the activation energy, frequency factor and, reaction order, a kinetic law was proposed for the esterification of naphthenic acids in Colombian heavy oil. Finally, it was evaluated the effect of esterification of naphthenic acids on the corrosion of steel ASTM A106 Gr.B. The corrosion of steel was reduced from 34,16 to 3,08 mils per year, (mpy), after esterification of naphthenic acids.
Methodology to increase oil reserves by identifying optimal time to abandon non-economic wells
Authors: Sandoval Publio-Alejandro , Fernández Fabián-Ricardo , Ordoñez-Rodríguez Aníbal , Rincón-Bonilla Claudia , Jerez Leydy-Johana 
Published: January 2020

Estimating reserves is one of the most important tasks in the oil industry. It is the process that determines the recoverable oil in a field, area or region. However, incorporating the production of a well beyond its economic limit has the effect of loss of value, because it forces economically good wells to sustain those that are not. A corporate vision of the topic, calls for greater attention to strategies to select wells for abandonment, as an important variable in the planning of production scenarios and estimating reserves. The purpose of this paper is to describe the methodology used to obtain higher value in reserves calculated for a given asset, by analyzing direct production costs and the design of an optimum well abandonment timetable.
The methodology can be applied in all the fields in which an analysis of this type has not been considered, which run the risk of having incorporated in their reserve estimate a number of wells in which the economic balance is negative, thus affecting the performance of the reservoir's better wells.
Additionally, it includes a case application of the methodology involving a field in a Colombian basin. The results show a 5 year extension in economic limit, with a significant increase in the amount of the asset's recoverable reserves.
Artificial lift management: Recommendations and suggestions of best practices
Authors: Hirschfeldt Clemente-Marcelo 
Published: January 2020

Artificial lift systems (ALS) play an important role during the oil field production process. The selection, acquisition, installation, evaluation, monitoring and subsequent inspection of these systems involves different stakeholders, including the companies and different sectors therein. When you add factors such as field location, local culture and the experience of the companies in the area, understanding and analyzing each of the factors is critical not only to maximize the life of a specific ALS, but also to maximize and optimize field production in an efficient, effective manner. Another important factor to consider is the dynamic of developing new oil fields or those affected by different EOR technologies, such as secondary recovery by water injection, where field requirements and conditions change on a continuous basis.
This paper presents concepts and recommendations regarding the management of ALS during the productive life of an oil field, contemplating the criteria of selection, acquisition, installation, evaluation and monitoring, as well as the subsequent inspection thereof. The issues analyzed herein also involve concepts related to operating as well as service companies and sectors involved in acquisition, evaluation and monitoring, among others. It also mentions definitions of the roles, functions and competencies required to live up to the challenges posed by these systems.
Fluid migration history from analysis of filling fractures in a carbonate formation (lower cretaceous, middle Magdalena valley basin, Colombia)
Authors: Conde-Gómez Jairo , Mantilla-Figueroa Luis-Carlos , Naranjo-Vesga Julián-Francisco , Sánchez-Rueda Nelson 
Published: January 2020

The integration of Conventional Petrography, SEM, Rare Earth Element geochemistry (REE) and Fluid Inclusions analysis (FI), in the fracture fillings at the Rosablanca Formation (Middle Magdalena Valley basin), make it possible to relate opening and filling events in the veins with hydrocarbon migration processes.Petrographic and SEM data indicate that the veins are fracture filling structures, with three types of textures:1) Granular aggregates of calcite (GA); 2) Elongated granular aggregates of calcite (EGA); and 3) Fibrous aggregates of calcite and dolomite (FA). The textural relationship suggests that GA must have been formed in an environment of widespread extension of the basin, while EGA and FA must have been formed in a compressive environment.
The geochemical analyses of REE carried out in the dominant fill of the veins (GA) indicate that these fillings must have been formed in a closed system (intraformational fluid movement) for the drilling well Alfa-1, while in the drilling wells Alfa-2 and Alfa 3, these fills (GA) must have been formed in a characteristic environment of open system (transformational fluid movement). Two pulses of hydrocarbon migration were identified through the study of fluid inclusions: In the first event, light hydrocarbons and aqueous fluids (H2O-NaCl-CaCl2) migrated trough the primary porosity and fractures at temperatures between 60ºC- 90ºC. In the second event, light hydrocarbons associated with aqueous fluids (H2O-NaCl-CaCl2) migrated through fractures at temperatures between 70ºC - 120ºC. Data obtained in this investigation will strengthen the knowledge about the hydrocarbon migration history and entrapment in the Middle Magdalena Valley basin (VMM) particularly in the lower Cretaceous age reservoirs.
Dense suspensions formulations for upgrading processes in heavy and extra heavy crude oil
Authors: Rodríguez Lilia , Viviescas Geoffrey 
Published: January 2020

The present work involved the formulation of solid-liquid suspensions of by-products of heavy and extra heavy crude oil process upgrades, coke and asphaltenes from Delayed coking and Deasphalting processes. This was done by controlling rheological properties and following specifications for pipeline transmission, similar to those of liquid hydrocarbons. The formulated products guarantee the possibility of moving the by products in a fluidized way, minimizing storage, handling, environmental and operational costs in transportation, and providing an attractive alternative as non conventional fuel.
Regarding the formulation of suspensions, it was necessary to establish the effect of formation components such as: surfactants, stabilizers, as well as the type, amount of solids and particle size ratio on the flow properties of the resulting product. The parameters analyzed for rheological properties of pipeline transport were viscosity, particle size distribution, static and dynamic stability.
Laboratory tests were performed in high precision rheometers -TA Instruments RX1500 and Haake RS600- and Mastersizer 2000 particle size analyzer. At pilot scale, we used a closed loop to verify flow parameters, including normal and critical transport scenarios: Sudden shutdowns and extended ones of up to 72 hours, with subsequent pumping re-starts.
Tests performed at the lab and the pilot plant showed better rheological properties in the formulations with bimodal particle size distribution. This allowed higher loads of solid, up to 52%, and an improved mobility, reflected as lower viscosity. A non-Newtonian rheological behavior became evident, characterized by yield stress to ensure pumpability after prolonged inactivity. The pressure drops and calculation of apparent viscosity obtained in the pilot plant were compared and verified with lab results, showing reproducibility.
Bilgisayar Destekli Matematik Öğretiminin Öğrencilerin Matematik Tutumuna Etkisi: Bir Meta-Analiz Çalışması
Authors: ÖZDEMİR Ferhat , ASLANER Recep , AÇIKGÜL Kübra 
Published: January 2020

Amaç: Bu
araştırmada Bilgisayar Destekli Matematik Öğretiminin (BDMÖ)’nün öğrencilerin
matematik tutumuna etkisinin incelendiği deneysel çalışmalarda ulaşılan
sonuçların meta-analiz yöntemi kullanılarak sentezlenmesi amaçlanmıştır. Yöntem: Araştırmada
“Yükseköğretim Kurulu Ulusal Tez Merkezi” veri tabanında yer alan yüksek lisans
(YL) ve doktora (DR) tezlerinden araştırmada belirlenen kriterlere uygun 30
deneysel çalışma meta-analize yöntemiyle birleştirilmiştir. Bulgular: BDMÖ’nün
matematik tutumu üzerindeki genel etki büyüklüğü değeri rastgele etkiler
modeline göre Hedges's g= .539 olarak hesaplanmıştır. BDMÖ’nün matematik tutumu
üzerindeki etkisinin; yayın yılı aralığı, uygulama süresi, örneklem büyüklüğü,
sınıf düzeyi ve yayın türü değişkenlere göre anlamlı düzeyde farklılık
göstermediği belirlenmiştir.

Sonuçlar ve Öneriler: Araştırmanın
sonucunda hesaplanan genel etki büyüklüğü değeri, Thalheimer ve Cook (2002)
tarafından yapılan sınıflandırmaya göre BDMÖ’nün matematik tutumu üzerinde orta
düzeyde etkiye sahip olduğunu göstermektedir. Bu sonuç dikkate alınarak, araştırmacılar
tarafından BDMÖ’nün öğrencilerin matematik tutumu üzerindeki etkisi; okul türü,
öğrenme alanı, cinsiyet, yapıldığı bölge, uygulamayı yapan kişi, kullanılan
bilgisayar programı gibi moderatörler açısından da incelenebilir.
Ketahanan Pangan di Kampung Adat dan Non-Kampung Adat
Authors: Perdanaputra Fauzi , Prasodjo Nuraini Wahyuning 
Published: January 2020

The aims of this research are to analyze the differences of local wisdom and food security household in an indigenous village and non-indigenous village and to analyze the correlation between local wisdom and food security. Research respondents are housewives or housewives who also act as head of household. The research method used a quantitative approach with questionnaire instruments supported by qualitative data with in-depth interview. The results show that there are the difference of food security in Ciptagelar Village and Tonjong II Village which the level of household local wisdom and food security in Kampung Ciptagelar is higher than in Kampung Tonjong II. In addition, from the three dimensions of local wisdom tested, there are two dimensions that have a positive and quite strong relationship with food security, that is the dimensions of local knowledge and community solidarity and compliance with rules and leaders.Keywords: Food Security, Indigenous Village, Local Wisdom, Non-Indigenouse VillageABSTRAKPenelitian ini bertujuan untuk menganalisis perbedaan kearifan lokal dan ketahanan pangan rumah tangga di Kampung adat dan non-kampung adat serta menganalisis hubungan antara kearifan lokal dengan ketahanan pangan. Responden penelitian merupakan ibu rumah tangga atau ibu rumah tangga yang juga berperan sebagai kepala rumah tangga. Metode penelitian menggunakan pendekatan kuantitatif dengan instrumen kuesioner yang didukung dengan data kualitatif dengan metode wawancara mendalam. Hasil penelitian menunjukkan bahwa terdapat perbedaan tingkat ketahanan pangan di Kampung Ciptagelar dan Kampung Tonjong II yang mana tingkat kearifan lokal dan tingkat ketahanan pangan rumah tangga di Kampung Ciptagelar lebih tinggi dibandingkan dengan Kampung Tonjong II. Selain itu, dari tiga dimensi kearifan lokal yang diuji, terdapat dua dimensi yang memiliki hubungan positif dan cukup kuat dengan ketahanan pangan yakni dimensi pengetahuan lokal dan solidaritas masyarakat dan kepatuhan pada aturan serta pemimpin. Kata kunci: Kampung Adat, Kearifan Lokal, Ketahanan Pangan, Non-kampung Adat
Kapasitas Adaptasi dan Resiliensi Komunitas Menghadapi Bencana Erupsi Gunung Merapi
Authors: Dillashandy Nyimas Ayu , Panjaitan Nurmala K 
Published: January 2020

Mount Merapi eruption has occurred several times in Indonesia and the biggest eruption that last occurred in 2010. The community were suffered losses and were affected by eruptions. The purposes of this research are to analyze community resilience, to analyze the level of vulnerability, and to analize the community adaptive capacity. The research using a quantitative approach supported by qualitative data. Simple random sampling technique is used as the sampling method and the informant was taken purposively. The results of this research showed that when the eruption occurred the community has a high vulnerability. The adaptive capacity is also high with innovative learning based on institutional memory and supported by the connectedness. Communities achieve resilience and can adapt to changes with high adaptive capacity. Keywords: adaptive capacity, community resilience, eruption, vulnerability ABSTRAK Erupsi Gunung Merapi sudah terjadi beberapa kali di Indonesia dan erupsi terbesar yang terjadi terakhir kalinya yaitu pada tahun 2010. Komunitas mengalami berbagai kerugian dan terkena dampak dari erupsi. Tujuan dari penelitian ini adalah untuk menganalisis resiliensi komunitas, menganalisis tingkat kerentanan komunitas, dan menganalisis kapasitas adaptasi komunitas. Penelitian ini dilaksanakan dengan menggunakan pendekatan kuantitatif yang didukung oleh data kualitatif. Pemilihan responden dilakukan dengan teknik sampel acak sederhana sedangkan pemilihan terhadap informan dilakukan secara sengaja. Hasil penelitian ini menunjukkan bahwa saat erupsi terjadi komunitas memiliki kerentanan yang tinggi. Kapasitas adaptasi komunitas tinggi dengan adanya innovative learning yang didasari oleh pengetahuan dan pengalaman dan didukung oleh jaringan yang dimiliki. Komunitas berhasil mencapai resiliensi dan dapat beradaptasi dengan perubahan-perubahan dengan kapasitas adaptasi yang tinggi.Kata kunci : kapasitas adaptasi, kerentanan, erupsi, resiliensi komunitas