bluuebunny/crossref_metadata_2025 huggingface dataset:
Percepções de usuários atendidos em um pronto atendimento: olhar sobre a atenção primária à saúde
Authors: Baratieri Tatiane , Paes de Almeida Keroley , Lentsck Maicon Henrique , Natal Sonia
Published: August 2017

Objetivou-se compreender os motivos que levam os usuários a buscar as Unidades de Pronto Atendimento (UPA) quando o problema de saúde poderia ser resolvido no âmbito da Atenção Primária à Saúde (APS). Estudo descritivo, qualitativo, com 24 usuários da UPA de município do Sul do país, coleta de dados em fevereiro/março de 2015, por entrevista semiestruturada, e analisados pela análise de conteúdo. Dos resultados emanaram três categorias: descompasso entre a visão médico-centrada e a inadequação das equipes de saúde da APS para atenção à demanda espontânea; o acolhimento deficitário na APS gera dificuldades de acesso e baixa resolutividade da equipe de saúde; e desarticulação entre UPA e APS: necessidade de estruturação da coordenação do cuidado. Conclui-se que as UPAs são vistas pela população como mais resolutivas, havendo necessidade de ordenar fluxos de atendimento e educar/informar a população sobre seu funcionamento.
Stakeholders approach on corporate governance and performance of Vietnamese manufacturing firms
Authors: Dao Thi Thanh Binh , Tran Thi Kim Anh
Published: August 2017

Corporate governance is one of the most vital issues in this compound environment at present, which is indicated by the fact that the success or failure of firms strongly depends on performance of the control that board of directors and executive board, take on corporations’ activities. This issue has attracted a variety of researches worldwide, and become a popular buzz lately, however there is still limited researches on this topic in Vietnam. In this paper, we focus on manufacturing sector, one of the most important industries in Vietnam economy, which account for 41.2% of total GDP in 2012. By using stakeholder theory and Kitamura’s paper as a corner stone, a model using OLS regression and log functional form for production function, showing the relationship between some external factors and internal factors including corporate governance is built. From the result of the research, it has been found out that internal factors (corporate governance) significantly affect the firm’s performance, whereas external factors (market share) do not really show any influence. In term of production function, this manufacturing sector still benefits from an increase of capital but not that of labor.
Estudo em múltiplas escalas temporais da intensidade de raios cósmicos medida na superfície terrestre
Authors: Mendonça Rafael Rodrigues Souza de , Raulin Jean-Pierre , Bertoni Fernando Celso Perin , Echer Ezequiel , Makhmutov Vladimir Salingereevich , Fernández Germán
Published: August 2017

Neste trabalho são descritas e analisadas as primeiras observações realizadas através do detector de raios cósmicos CARPET que está instalado, desde2006, no Complejo Astronómico El Leoncito (CASLEO) nos Andes Argentinos. Serão apresentados os primeiros estudos desenvolvidos entre abril de 2006 e fevereirode 2010 sobre as variações de longa e de curta duração da contagem de raios cósmicos, registrada por este detector, relacionadas com a atividade solar e com aocorrência de chuva. Apesar do pouco tempo de operação, foi possível observar com os dados do CARPET uma variação de longa duraçao associada ao ciclo solar de11 anos. Há um acréscimo gradual de intensidade registrada condizente com a diminuição da atividade solar ocorrida neste período. A análise das variações transientesobservadas durante períodos chuvosos evidencia que as mudanças no campo elétrico atmosférico também exercem influência nas variações transientes de curta duraçaona intensidade de raios cósmicos observada pelo CARPET.
Prospecção de água subterrânea no sudoeste do município de Rondonópolis (MT) usando sondagem elétrica vertical
Authors: Cutrim Alterêdo Oliveira , Shiraiwa Shozo
Published: August 2017

Esta pesquisa foi realizada no sudoeste do município de Rondonópolis, estado de Mato Grosso, com o objetivo de subsidiar a construção de poço tubular profundo, usando sondagem elétrica vertical (SEV), com AB/2 máximo de 2.000 m. A pesquisa mostrou que o Terciário/Quaternário tem profundidade ao topo de 6 m, espessura de 13 m a 18 m; a Formação Furnas tem profundidade ao topo variando de 16 m a 23 m e espessura de 81 m a 180 m; a profundidade ao topo do embasamento varia de 97 m a 202 m. Como a Formação Furnas é o principal aquífero da área, poços mais produtivos devem ser construídos onde este aquífero apresenta maior espessura. Os resultados orientaram a construção de três poços tubulares profundos, os quais mostraram um acerto de 95% na profundidade estimada pelas SEVs.
Diagnóstico sobre contaminação das águas subterrâneas na área do Parque Estadual do Utinga, Belém-PA, pelos métodos elétrico e eletromagnético
Authors: Bahia Vânia Eunice , Gouvêa José Luiz , Leal Luiz Rogério Bastos , Fenzl Norbert , Morales Gundisalvo Piratoba
Published: August 2017

No presente trabalho foram realizados levantamentos geofísicos e a perfuração de piezômetros para avaliar as características geológicas e a possibilidadede contaminação no Parque Estadual do Utinga, que contém dois grandes reservatórios de águas superficiais, responsáveis pelo abastecimento da região metropolitana de Belém-PA. A metodologia geofísica aplicada envolveu medidas eletromagnéticas (sistema Slingram) e Sondagens Elétricas Verticais (SEVs), que evidenciaram a presença de camadas geológicas com características elétricas diferentes, permitindo a identificação de zonas mais condutoras associadas a camadas argilosas e menos condutoras associadas a camadas arenosas, além da presença do nível freático próximo à superfície. Foi estabelecido um padrão de caracterização da subsuperfície que permitiu comparar e correlacionar os resultados com as informações provenientes das descrições geológicas e hidrogeológicas obtidas em piezômetros, demonstrando uma forte correspondência entre os dados.
Sistemas aerogravimétricos gradiométricos 3D-FTG e Falcon na exploração de minério de ferro
Authors: Galbiatti Henry , Braga Marco Antonio , Carlos Dionísio Uendro , Sousa Rodrigo Rocha de
Published: August 2017

O presente trabalho de pesquisa apresenta uma descricão das características dos sistemas 3D-FTG (Full Tensor Gravity Gradiometer ) e AGG Falcon (AirborneGravity Gradiometer ), assim como as fases do planejamento e controle de qualidade dos dados levantados com esses dois sistemas. O 3D-FTG é atualmente a única tecnologia aérea existente capaz de medir as cinco  componentes independentes do tensor do gradiente de gravidade. O sistema Falcon mede uma das componentes do tensor e também a curvatura (composição de duas componentes será mostrada a frente), os dois sistemas podem ser utilizados tanto para levantamentos detalhados como regionais. As aquisições de dados com os sistemas 3D-FTG e Falcon, que serão apresentadas, foram realizadas sobre um dos depósitos de minério de ferro de Carajás, Serra Leste, no estado do Pará, Brasil. Mineralizações de óxido de ferro são largamente controladas por estruturas crustais e locais, como zonas de cisalhamento,zonas de falha e contatos litológicos. Um controle cartográfico preciso destas estruturas, para a utilização de aerolevantamentos gravimétricos gradiométricosé muito importante para se encontrar concentrações consideráveis e econômicas destes tipos de depósitos.
Spatial variation of angle-dependent impedance through a thin-layered oil reservoir
Authors: Oliveira José Sampaio de , Martins Jorge Leonardo
Published: August 2017

O conceito de impedância elástica (EI) da onda compressional é atualmente usado como um parâmetro petrofísico complementar para a caracterizaçãode reservatórios de petróleo e gás. Neste artigo, construímos mapas que representam a variação espacial da EI isotrópica e anisotrópica a uma profundidade específica através de um reservatório turbidítico produtor de petróleo e gás. EI é então usada aqui não para calibração e inversão de dados sísmicos de grandes afastamentos como proposto originalmente, mas como uma aplicação original de um conceito petrofísico novo. Uma vez que densidade efetiva, velocidades sísmicas e ângulo de incidncia são variáveis comuns nas fórmulas isotrópica e anisotrópica da EI, usamos registros geofísicos nas vizinhanças de 39 poços perfurados através da formação que contém o reservatório a fim de gerar mapas isotrópicos e anisotrópicos de EI. A estrutura interna do reservatório consiste de camadas delgadas, o que nos permitiu aproximar a formação a um meio transversalmente isotrópico com eixo de simetria vertical (meio TIV) para construção dos mapas de EI anisotrópica. Dessa forma, aplicamos a técnica da média de Backus para estimativa dos perfis de rigidezas elásticas TIV a partir de registros de perfis de poços através da formação do reservatório. Para a construção dos mapas, implementamos um processo de interpolação incorporando um robusto interpolador de distância inversa com pesos quadráticos em um esquema de “raio de procura”. Nesse esquema, somente pontos de controle dentro de uma distância especificada a priori são considerados no processo de interpolação. Os mapas resultantes da EI para ângulos de incidência de 0◦, 20◦ e 40◦, numa profundidade de 3080 m, revelam zonas de camadas delgadas ao redor de certos poços. Observamos que a anisotropia sísmica induzida por camadas delgadas é marcante nessas zonas, coincidindo com intervalos de baixa produção de óleo. Na mesma profundidade selecionada para a formação que contém o reservatório, as demais partes dos mapas mostram uma intensidade fraca de anisotropia TIV.
Combining noise-adjusted principal components transform and median filter techniques for denoising modis temporal signatures
Authors: Carvalho Júnior Osmar Abílio de , Silva Nilton Correia da , Carvalho Ana Paula Ferreira de , Couto Júnior Antônio Felipe , Silva Cristiano Rosa , Shimabukuro Yosio Edemir , Guimarães Renato Fontes , Gomes Roberto Arnaldo Trancoso
Published: August 2017

Consistent multi-temporal images are necessary for accurate landscape change detection and temporal signatures analysis. Orbital images have a difficultyto maintain a temporal information precision due to several interferences that generate missing data. In this paper is developed a program in C++ languagefor denoising MODIS temporal signatures considering two-phase scheme for removing impulse and white noise. In the first phase, the median filter is used to identifyimpulse noise. In the second phase, the Noise-Adjusted Principal Components (NAPC) transform is applied to eliminate white noise. Because they are two complementarymethods, there is high performance in removing noise. The restored NDVI (Normalized Difference Vegetation Index) signatures showed a significant improvementproviding a time series dataset that can be used to identify and classify the vegetation physiognomic types.
Geoelectrical prospection of disseminated sulfide mineral occurrences in Camaquã Sedimentary Basin, Rio Grande do Sul State, Brazil
Authors: Moreira César Augusto , Lopes Syngra Machado , Schweig Camila , Seixas Adriano Da Rosa
Published: August 2017

The mineral exploration is a complex activity that should involve a combination of direct and indirect techniques of geological investigation. The growing demand for base metals in the national and international market provides the revaluation of mineral occurrences that can become deposits and mines. This paper presents the results of the electrical resistivity and induced polarization geophysical methods in azimuthal arrangement, applied in a mineral occurrence of disseminated copper sulfides, previously studied through trenches and core drilling, located in the Camaquã Sedimentary Basin, Rio Grande do Sul State, Brazil. The inversion models indicate the coincidence of high chargeability and low resistivity values. The  integration of geophysical data permitted the elaboration of 3D attributes visualization models for the mineralization enclosed in volcanic tuffs. The integrated geophysical and geological analysis indicates the potential of a new mineralized area.
SPECTRAL UNIFORMITY EVALUATION OF REFERENCE SURFACES FOR AIRBORNE AND ORBITAL SENSORS ABSOLUTE CALIBRATION
Authors: Ponzoni Flávio Jorge , Pinto Cibele Teixeira , Castro Ruy Morgado de , Griffith Derek John
Published: August 2017

The extraction of quantitative information from data collected by either airborne or orbital electro optical sensors is only possible through a well-performed absolute calibration. The most common method of in-flight absolute calibration uses a reference surface. One of the most critical steps to implement this method is the reference surface characterization, which must be spectrally uniformity, among other features. This study presents the methodology used to assess the spectral uniformity of two potential areas for in-flight sensor calibration. Two surfaces were studied: (a) an area in Brazil of bare soil (quartz sand) and (b) TuzG ¨ol¨u salt flat in Turkey considered by the CEOS (Committee on Earth Observation Satellites) an official area for orbital sensors calibration. Radiometric measurements were carried out at various sampling points in these two areas. In addition, the study aims to describe and determine some of the main uncertainties sources involved in this process. According to the statistical criteria adopted, both reference surfaces have not been considered spectrally uniform.
ELECTROFACIES CHARACTERIZATION USING SELF-ORGANIZING MAPS
Authors: Kuroda Michelle Chaves , Vidal Alexandre Campane , Leite Emilson Pereira , Drummond Rodrigo Duarte
Published: August 2017

The characterization of electrofacies is essential for reservoir modeling. However, this is a process that dependends on many variables, with errors and associated noise that interfere on visual interpretation. In order to minimize uncertainties, this paper proposes the use of the artificial neural network called Auto-Maps Organizing, which is a computational algorithm inspired on the brain function that maps and groups similar information. The petrophysical data used, referes to Namorado Field on Campos Basin, of which were studied the neutron porosity, gamma ray, density and sonic profiles, to classify the field’s reservoirs lithology. From the resultsit was possible to define the reservoir geometry and to detail its features with more accuracy.
HYPERSPECTRAL REMOTE SENSING: EVALUATION OF R95/HSS SENSOR FOR SPATIALIZATION AND CHARACTERIZATION OF SOIL IN MANAUS, AM – BRAZIL
Authors: Correia Manoel Ricardo Dourado , Araújo Rutenio Luiz Castro de
Published: August 2017

The HSS (Hyperspectral Scanner System) was evaluated for characterization and spatialization of soils in Manaus, AM, Brazil, with 3 meter resolu- tion images. The images (37 bands between 0,43 and 2,37μm) were converted from radiance values to surface reflectance using the Fast Line-of-sight Atmospheric Analysis of Spectral Hypercubes (FLAASH) applicative, based on the MODTRAN +4 (Moderate Resolution Transmittance) a radioactive transfer model. Preceding collec- tion of soil samples, the main soil classes were identified through the SAM (Spectral Angle Mapper) method in order to facilitate analysis of the spectral characteristics of the studied area. Finally, for 13 samples, correlations among soil characteristics and spectral data from the HSS sensor, and spectral curves obtained in laboratory were carried out. Results indicated that: (a) the atmospheric correction accomplished with the FLAASH applicative was appropriate, despite difficulties for total removal of the water vapor feature at 0.94μm and at short-wave infrared band, near to 2.0μm. In general, a spectral coherence of the HSS sensor was confirmed with the information found in literature and the spectrum obtained in the laboratory; (b) a good capacity for spectral identification was observed with the SAM classifier as the results provided an appropriate soil preidentification, helping as well to define sites for field work; (c) the spectral curves representative of the soil classes are comparable both for laboratory and sensor data. Usually, correlations between both data acquisition environments (laboratory and HSS) are high.
GROUNDWATER PROSPECTION IN THE MUNICIPALITY OF PIÇARRA-PA USING VERY LOW FREQUENCY AND RESISTIVITY
Authors: Sousa Gilvana Bezerra de , Luiz José Gouvêa
Published: August 2017

This study was conducted in the municipality of Pic¸arra, located in the southeastern part of the state of Par´a. The aim of the study was to use geophysical methods to map the lineaments associated with bedrock fractures and the nature of the subsoil using the Very Low Frequency (VLF) electromagnetic method and the electrical resistivity in vertical electrical sounding (VES) technique. The integrated analysis of the geophysical data delineated two hydrogeological domains, namely, fracture zones and sediment layers on the bedrock, that could be potential locations of wells for groundwater extraction. The study was designed to identify the most promising units for groundwater extraction and the best locations for the construction of wells to supply groundwater to the city.
EVALUATION OF ENHANCEMENT TECHNIQUES OF MAGNETIC ANOMALIES APPLIED TO STRUCTURAL INTERPRETATION OF THE ITAITUBA REGION, STATE OF PARÁ – BRAZIL
Authors: Bongiolo Alessandra De Barros e Silva , Ferreira Francisco José Fonseca
Published: August 2017

The purpose of this article is to describe the work carried out for evaluating enhancement techniques of magnetic anomalies applying the reduction-to-the-pole method and its implications for structural interpretation of a region located in low magnetic latitude. With this objective, the answer given by several data enhancement methods with and without reduction-to-the-pole was analyzed. These methods were applied to synthetic prisms located at low magnetic latitudes similar to the area of analysis and the resulting anomalies were compared to those calculated at the magnetic pole. The synthetic data has been generated from a program that calculates the anomalies from prisms with arbitrary dimensions, susceptibilities and depths. The enhancement methods were also applied to magnetic data of rocks from the Amazon Basin and the Amazonian Craton, in the Itaituba region, Par´a state, northern Brazil. The reduction-to-the-pole algorithm applied to synthetic data during this work improved the performance of the enhancement methods, once, after its application, the maximum amplitude of the transformed anomalies were positioned over the edges of the sources, facilitating magnetic-structural interpretation. Good correlation among magnetic lineaments – particularly those inferred by the recently proposed tilt derivative of the total horizontal gradient method – and the already interpreted geologic structures back up the reduction to the pole indicating it may be applied even when data is collected in low magnetic latitudes.
STEREOTOMOGRAPHY FOR VELOCITY MODEL ESTIMATION IN SEISMIC IMAGING: APPLICATION TO REAL DATA FROM JEQUITINHONHA SEDIMENTARY BASIN
Authors: Terra Felipe A. , Costa Jessé C. , Bassrei Amin
Published: August 2017

O imageamento sísmico em profundidade é um desafio em áreas geologicamente complexas, onde a velocidade sísmica apresenta variação lateral. Porém, para se obter sucesso no imageamento sísmico em profundidade é necessário que se tenha uma estimativa confiável do modelo de velocidade. A estereotomografia é uma ferramenta efetiva para se alcançar esse propósito. Também denominada de tomografia de inclinação, ela utiliza as vagarosidades e os tempos de trânsito selecionados de famílias de fonte comum e de receptor comum. Nós avaliamos uma alternativa da estereotomografia para a construção do modelo de velocidades. O algoritmo foi validado no conjunto de dados sintéticos Marmousoft e também em dados reais provenientes da Bacia do Jequitinhonha, Brasil, numa região de talude continental. Este conjunto de dados com complexidade estrutural demandou um controle de alta qualidade na seleção de eventos, numa escolha criteriosa dos parâmetros de regularização, e a atenuação de múltiplas de superfície livre. Os resultados tanto para os dados sintéticos como para os reais mostraram a viabilidade computacional e precisão do método. ABSTRACT. Seismic imaging in depth is a challenge in geologically complex areas, where the seismic velocity varies laterally. The estimation of a reliable velocity model is necessary in order to succeed in seismic depth imaging. Stereotomography is an effective tool to achieve this purpose. Also called slope tomography, it uses the slowness and picked traveltimes from reflection events picked in common source and common receiver gathers. We evaluate an alternative implementation of stereotomography for velocity model building. The algorithm was validated in the Marmousoft synthetic data set and also used for velocity model estimation in acontinental slope region, using real data from Jequitinhonha Basin, Brazil. This data set of structural complexity demanded a high quality control of event selection forpicking, judicious choice of regularization parameters and free surface multiple attenuation. The results for both the synthetic and real data have shown the computational feasibility and accuracy of this method.Keywords: stereotomography, regularization, Jequitinhonha Basin
SEISMIC TRAVELTIME TOMOGRAPHY APPLIED TO DATA FROM MIRANGA FIELD, RECÔNCAVO BASIN, BRAZIL
Authors: Rodrigues Vitor Hugo Serravalle Reis , Bassrei Amin
Published: August 2017

ABSTRACT. The growing global demand for hydrocarbons has tested the limits of oil exploration and exploitation technologies. Among the seismic methods, tomography is an alternative means for high-resolution characterization of reservoirs, and it enables a more efficient...Keywords: reservoir characterization, traveltime tomography, seismic inversion, regularization, Recôncavo Basin. RESUMO. A crescente demanda mundial por hidrocarbonetos tem testado os limites das tecnologias de exploração e explotação de petróleo. Dentro dos métodos sísmicos, a tomografia surge como alternativa de caracterização de alta resolução dos reservatórios,...Palavras-chave: caracterização de reservatórios, tomografia de tempos de trânsito, inversão s´ísmica, regularização, Bacia do Recôncavo.
FULL WAVEFORM INVERSION USING AN EFFICIENT PRECONDITIONING METHOD FOR THE GRADIENT VECTOR APPLIED FOR DIFFERENT SOURCE SIGNATURES
Authors: Santos Peterson Nogueira , Pestana Reynam C.
Published: August 2017

ABSTRACT. Full-waveform inversion (FWI) is a powerful method and it has been used successfully to invert subsurface parameters. It consists basically on the minimization of the difference between the predicted and observed data. However, its application using finite-difference schemes is limited to low frequency content and the increase of the range of higher frequency...Keywords: full waveform inversion, preconditioning method, rapid expansion method. RESUMO. Inversão de forma de onda completa (FWI) é um método poderoso e tem sido utilizado com sucesso para inverter parâmetros de subsuperfície. Consiste basicamente na minimização da diferença entre os dados previstos e observados.No entanto, sua aplicação usando esquemas de diferenças finitas é limitada ao conteúdo de baixa frequência e o aumento da banda...Palavras-chave: inversão completa da forma de onda, método de pré-condicionamento, método de expansão rápida.
MAGNETIC ANALYSIS OF ABAETÉ DIAMONDIFEROUS DISTRICT (MG) AND ITS POSSIBLE PRIMARY SOURCES
Authors: Silva Gisella Magalhães , Endo Issamu , Barbosa Maria Sílvia Carvalho
Published: August 2017

ABSTRACT. This work studies the origin of the diamonds from the important mining region, Abaet´e Diamondiferous District (MG). The discovery of pipes with micro diamonds and/or crater facies kimberlites in the entire Alto Parana´ıba Igneous Province...Keywords: mineral prospecting, Euler Deconvolution, Alto Paranaíba Igneous Province. RESUMO. Este trabalho estuda a origem dos diamantes de uma importante região mineradora, o Distrito Diamantífero Abaeté (MG). A descoberta de kimberlitos com microdiamantes e/ou fácies de cratera em toda Província Ígnea do Alto...Palavras-chave: prospecção mineral, Deconvolução de Euler, Província Ígnea do Alto Paranaíba.
OBSERVATIONS OF SMALL-SCALE GRAVITY WAVES IN THE EQUATORIAL UPPER MESOSPHERE
Authors: Campos José André Vieira , Paulino Igo , Wrasse Cristiano Max , Medeiros Amauri Fragoso de , Paulino Ana Roberta , Buriti Ricardo Arlen
Published: August 2017

ABSTRACT. Using airglow images collected at São João do Cariri (7.4◦S; 36.5◦W) from 2009 to 2010, the spectral characteristics and seasonality in the propagation direction of small-scale gravity waves were studied...Keywords: airglow, neutral wind, gravity waves, blocking diagram. RESUMO. Utilizando imagens de aeroluminecência coletadas por um imageador instalado em São João do Cariri (7,4◦S; 36,5◦W) no período de 2009 a 2010, foram estudadas as características espectrais bem como a sazonalidade na direção...Palavras-chave: aeroluminescência, vento neutro, ondas de gravidade, diagrama de bloqueio.
ACOUSTIC TRAVELTIME TOMOGRAPHY FOR CO2 INJECTION MONITORING IN RESERVOIRS
Authors: Pereira Luara Rodrigues , Bassrei Amin
Published: August 2017

ABSTRACT. When considering with greenhouse effect and global warming, carbon dioxide is the main agent. As the major contributors to the increase in global temperature, large companies and corporations have been encouraged to look for ways to reduce the emission of...Keywords: traveltime tomography, reservoir monitoring, geological storage, CO2 injection. RESUMO. Quando tratamos do efeito estufa e aquecimento global temos como seu principal agente o dióxido de carbono. Por serem grandes contribuintes do aumento da temperatura do planeta, grandes empresas...Palavras-chave: tomografia de tempos de trânsito, monitoramento de reservatórios, armazenamento geológico, injeção de CO2.
ONE-STEP EXTRAPOLATION METHOD USING CHEBYSHEV’S RECURRENCE RELATION APPLIED TO SEISMIC MODELING
Authors: Ortiz Laura Lara , Pestana Reynam C.
Published: August 2017

ABSTRACT. In this work we show that the solution of the first order differential wave equation for an analytical wavefield, using a finite-difference scheme in time, follows exactly the same recursion of modified Chebyshev polynomials. Based on this, we proposed a numerical...Keywords: seismic modeling, acoustic wave equation, analytical wavefield, Chebyshev polinomials. RESUMO. Neste trabalho, mostra-se que a solução da equação de onda de primeira ordem com um campo de onda analítico usando um esquema de diferenças finitas no tempo segue exatamente a relação de recorrência dos polinômios modificados de Chebyshev. O algoritmo...Palavras-chave: modelagem sísmica, equação da onda acústica, campo analítico, polinômios de Chebyshev.
Prediction of Uneven Tire Wear Using Wear Progress Simulation
Authors: Tamada Ryota , Shiraishi Masaki
Published: August 2017

Tire wear performance is very important in terms of safety and economic benefit for customers and environmental conservation. Tire wear performance can be sorted into “global” or “local” wear. Local wear means uneven tire wear, for example, heel/toe wear, one-sided shoulder wear, feather edge wear, etc. This uneven wear decreases tire life locally and has the potential for causing a noise problem, so it is very important to improve uneven wear performance for long life tire. It is difficult to correctly evaluate the uneven tire wear performance of a brand-new tire, because the tire wear performance changes with tire pattern shape transformation as it wears. In order to experimentally evaluate uneven wear performance accurately, we have to do time-consuming tire road tests. Therefore, we need a prediction method for uneven wear.

In this paper, we introduce “wear progress simulation” developed in order to evaluate heel/toe wear performance, which occurs in the shoulder blocks. This method involves “wearing out the finite element (FE) tire model” using wear energy calculated from tire rolling simulation. By this method, we can observe the transformation of tire pattern shape and wear energy distribution. As a result, we can estimate the difference of heel/toe wear performance among tires by our developed simulation.
Investigation of Fill Factor in Two-Wing Rotor Mixing of Rubber by Using Computational Fluid Dynamics
Authors: Dhakal Pashupati , Das Suma R. , Chandy Abhilash J.
Published: August 2017

The industrial process of manufacturing tires brings together all the ingredients required to mix a batch of rubber compound in an operation called mixing. The development and use of mixing in a mixing chamber equipped with a rotor has a significant impact on the process itself, and understanding mixing is important in terms of evaluating how material, mixer design, and operating variables (e.g., rpm, temperature, ram pressure) affect distribution, dispersion, and coupling reaction. One of the most important factors to consider is the fill factor, which is the volume of the material relative to the volume of the chamber. It is critical to determine the operating regime in terms of the level of mixing material in the chamber to satisfy all the mixing requirements of the process. Furthermore, the availability of modern high-performance computing resources and accurate mathematical models makes computational fluid dynamics (CFD) an important and necessary tool in understanding some of the complex physical and chemical phenomena associated with such industrial manufacturing problems. The objective of this paper is to assess the effect of fill factor in a two-wing rotor geometry that is used for rubber compounds mixing in the tire manufacturing process and thereby determine the best fill factor with regard to providing the highest mixing efficiency. A series of 3D CFD simulations in a mixing chamber with fill factors of 45, 60, 75, 90, and 100%, stirred by counter-rotating rotors, were carried out using a CFD code. Flow patterns, mixing index, particle trajectories, and statistics such as segregation scale, length of stretch, and pairwise distribution are presented to understand the mixing process with a long-term goal of improving product quality and throughput. Results showed that the major mixing mechanism is shear for most of the fill factors and that the 75% fill factor has the best distributive mixing characteristics among the fill factors studied here.
Evaluación térmica de sistemas geopoliméricos basados en metacaolín con incorporación de humo de sílice y ceniza de cascarilla de arroz
Authors: Villaquirán Monica A , Rodríguez Erich , Mejía de Gutiérrez Ruby
Published: August 2017

Se presentan los resultados obtenidos al someter un material geopolimérico basado en metacaolín a una temperatura de 1.200 °C utilizando como activador alcalino una mezcla de hidróxido de potasio con diferentes fuentes de sílice: un silicato comercial de tipo potásico (SP), ceniza de cascarilla de arroz (CCA) o humo de sílice. Se ajustaron las proporciones de metacaolín y activador en la mezcla para obtener relaciones molares de SiO2/Al2O3 de 2,5 y K2O/SiO2 de 0,28. También se estudió la sustitución del 50% del silicato comercial por CCA y humo de sílice, y se evaluó la resistencia a la compresión después de exponer la mezcla a diferentes temperaturas que variaron entre 300 y 1.200 °C. Se realizaron los respectivos análisis físicos, por ejemplo determinación de cambios volumétricos, y el estudio se complementó con un análisis microestructural realizado mediante difracción de rayos X y microscopia electrónica. A temperatura ambiente, los geopolímeros producidos reportan resistencias mecánicas entre ~30 y ~36 MPa. A 1.200 °C. Se aprecia que los materiales originalmente amorfos sufren una transformación hacia estructuras de naturaleza cristalina, específicamente mediante la formación de leucita y kalsilita. Se destaca el mejor desempeño termomecánico de los geopolímeros con un remplazo del 50% de SP por CCA, el cual luego de su exposición a 1.200 °C retiene el 44% de la resistencia que presenta a temperatura ambiente en comparación con el 26% retenido por el material de referencia.
Estrategia para profesionalizar tecnólogos enoperación de plantas petroquímicas
Authors: Tejada Tovar Candelaria , Villabona Ortíz Ángel , Rodríguez Bossa Cristian
Published: August 2017

La formación en pregrado por ciclos propedéuticos, se ha convertido en una nueva directriz de la política educativa en Colombia. Se presenta el diseño de un sistema que permitió articular eficientemente el programa, tecnólogo de operaciones de plantas petroquímicas del SENA, con el de ingeniería química de la Universidad de Cartagena, basado en el concepto de formación por ciclos propedéuticos. En el plan de formación de ambos programas y se establece una propuesta que permitió su articulación académica, para lo cual se diseñaron módulos de nivelación, con base en los conceptos ausentes de los tecnólogos en cada una de las asignaturas del ciclo básico de ingeniería. Se estableció el número de créditos totales validados en el sistema de acople, la manera como se dictaron estos módulos, y otras particularidades que hacen posible la articulación de ambos programas. De igual forma, se definieron los requerimientos administrativos necesarios para llevar a cabo este tipo de alianzas.
Los plásticos y el medio ambiente
Authors: FIPMA Fundación de la Industria Plástica
Published: August 2017

En el presente artículo se mencionan diferentes aplicabilidades que tiene el plástico en el sector industrial y su impacto en el medio ambiente.
Del residuo de plástico a la reutilización
Authors: FIPMA Fundación de la Industria Plástica
Published: August 2017

En este artículo se diferencian las formas de reutilización del plástico que se caracterizan según el grado de pureza del plástico, la suciedad o tamaño de los desechos plásticos a reutilizar.
Superficial modification by silanization of cellulose microfibers obtained from sugarcane bagasse
Authors: Luna Vera Fernando , Melo Cortes Harold Arturo , Murcia Claudia Viviana , Charry Galvis Italo
Published: August 2017

Se produjeron microfibras de bagazo de caña de azúcar que exhiben repelencia al agua tras su pretratamiento y modificación superficial con hexadeciltrimetoxisilano. Fueron estudiados tres pretratamientos para llevar a cabo deslignificación, remoción de hemicelulosa y exposición superficial de celulosa: tratamiento con hipoclorito 3% (HP), mezcla clorito de sodio y ácido acético (CAc) y una solución oxidante de hipoclorito-peróxido de hidrógeno seguida de tratamiento alkalino (OX-B). Lignina y hemicelulosa fueron efectivamente removidas de las fibras de bagazo con el tratamiento OX-B, el cual produjo fibras desagregadas de 567 ± 115 μm de largo y relación de aspecto de 32. Otros tratamientos como el HP producen menor cantidad de fibras, con menor longitud, 296 ± 32. La efectividad del tratamiento seleccionado, OX-B, permitió obtener un material lignocelulósico a partir de bagazo de caña de azúcar, fácilmente modificable e impermeable al agua cuyas características suponen su efectividad como elemento de reforzamiento en materiales compuestos de matriz polimérica.
Influence of potassium in the culture of the grape (Vitis labrusca) cv. ISABELLA
Authors: Puerto Guerrero Oswaldo , Mejía de Tafur Sara , Menjivar Flores Juan Carlos , Puentes Páramo Yina Jazbleidi
Published: August 2017

El potasio (K+) desempeña un papel importante en el crecimiento y la producción de la vid (Vitis labrusca). Para evaluar la influencia de diferentes dosis de sulfato de potasio (K2SO4) en el rendimiento y la calidad de uvas cosechadas, se realizó un estudio en plantaciones de vid cv. Isabella sembradas en la finca El Yundecito, municipio de Palmira, departamento del Valle del Cauca, Colombia. El seguimiento a la absorción de K+ se realizó mediante análisis foliares en cuatro etapas fenológicas del cultivo. Se evaluaron las siguientes variables de respuesta: número de racimos por planta, peso de racimo, longitud del racimo, bayas por racimo, grados Brix y rendimiento. Se utilizó un diseño experimental de bloques completos al azar con tres repeticiones y cuatro tratamientos: 0 (testigo), 100, 150 y 225 g de K2SO4 planta-1. Los datos obtenidos se analizaron mediante análisis de varianza, prueba de Duncan, análisis de correlación y análisis de regresión. Los resultados muestran que la adición de 100 g de K2SO4 planta-1 aumentó el rendimiento en un 24% con respecto al testigo. Cuanto más alto la cantidad de sulfato de potasio aplicado, mayor la disminución en el rendimiento. Igual situación se presentó con las variables de calidad, lo que sugiere que las aplicaciones superiores a esta dosis implican costos innecesarios y son poco amigables con el medio ambiente.
Plant extracts used as corrosion inhibitors
Authors: Tejeda Benítez Lesly Patricia , Meza Castellar Pedro Javier , Altamiranda Percy Edgar David , Berrocal Bravo María José
Published: August 2017

Los problemas de la corrosión son frecuentes en la industria química, petrolífera, naval, de construcción civil, en los medios de transporte, los sistemas de comunicación, entre otros. Los inhibidores de corrosión son ampliamente utilizados en el control y prevención de este fenómeno, la mayoría de los compuestos usados para este fin resultan demasiado tóxicos, costosos y dañinos para el medio ambiente y el ser humano. Esta situación ha creado la necesidad de encontrar inhibidores de corrosión que sean ambientalmente amigables y de bajo costo. Los extractos de plantas son biodegradables y representan una fuente renovable de compuestos químicos que poseen un alto potencial como inhibidores. Este artículo ofrece una revisión de la variedad de plantas superiores y algas que han sido utilizadas como inhibidores de corrosión de metales, mostrando el tipo de metal (acero, zinc y aluminio) y las condiciones del medio de exposición (ácido y neutro).
Sifat Fisis dan Mekanis Papan Semen dari Serat Tandan Kosong Kelapa Sawit (The Physical and Mechanical Properties of Cement Board Made from Oil Palm Empty Fruit Bunches Fibers)
Authors: Purwanto Djoko
Published: August 2017

Oil palm empty fruit bunches (OPEFB) fiber were industrial waste that has not been widely used by the community, only stacked and cause odors that interfere with the surrounding environment. This research studied the utilization of OPEFB fiber for cement board products using cement as resin and CaCl2 as accelerator. Laboratory scale cement board made from OPEFB fiber were mixed with cement, and CaCl2. The composition of fiber and cement were 1:1, 1:1.5, 1:2, and CaCl2 variations were 0%, 1% and 3%. A mixture of fibers, cement and CaCl2 was compressed at the pressure of 4 ton for 24 hours. The cement boards were tested for physical and mechanical properties according to JIS A 5417-1992, and the results were compared to the requirements of the cement board JIS A 5417-1992. Cement board made from fiber and cement composition 1:1.5 and CaCl2 content 3% produced moisture content, thickness swelling, water absorption, density, modulus of rupture/MOR, modulus of elasticity/MOE and screw withdrawal strength that met the requirement of JIS A 5417-1992. The composition of fiber and cement and the variations of CaCl2 content produced significant effect on water content, water absorption, thickness swelling, modulus of rupture/MOR, modulus of elasticity/MOE and screw withdrawal strength on cement boards.Keywords : oil palm empty fruit bunches fiber, cement boards, physical and mechanical properties
Kayu sebagai Bahan Bangunan Bertingkat Tinggi yang Ramah Lingkungan (Timber as Environmentally Friendly High-Rise-Building Materials)
Authors: Lestari Ratri Yuli
Published: August 2017

Wood has been widely used as building materials. The trends of using wood as construction materials in a building are keep increasing because the positive trend in construction expertise to use wood as building construction. Wood can be used as building materials such as structural construction, decking, roofing, flooring, cladding, furniture and interior. Wood is chosen because it is easy to work, flexible in design, high energy efficiency, low embodied energy, low global warming potential, fire resistance, and importantly wood is renewable and recyclable resources. Each country has their own regulations related to the application of wood as materials in high rise building. However, these regulations stimulated the expertises to demonstrate that wood is capable to be high-rise building materials and fulfil the safety building requirements. Keywords : wood, high-rise building, environmentally friendly
Juan A. Hasler, Fonemas y morfemas. Una praxis analítica. Universidad del Valle, Cali, 1994; 149 pp.
Authors: Santana Cepero Elizabeth
Published: August 2017

Se reseñó el libro: Fonemas y morfemas. Una praxis analítica.
Marta Ana Diz, Historias de certidumbres: los "Milagros" de Berceo. Juan de la Cuesta, Newark, DE, 1995; 274 pp.
Authors: Higashi Alejandro
Published: August 2017

Se reseñó el libro: Historias de certidumbres: los "Milagros" de Berceo.
Darío Villanueva, Estructura y tiempo reducido en la novela. Anthropos, Barcelona, 1994; 447 pp.
Authors: Vital Díaz Alberto
Published: August 2017

Se reseñó el libro: Estructura y tiempo reducido en la novela.
Jean-Pierre Nouhaud, Laurence Breysse-Chanet et al., Luis Cernuda. Désolation de la Chimère. Rencontres à l'Orangerie. Presses Universitaires de Limoges, Limoges, 1994; 184 pp.
Authors: Valender James
Published: August 2017

Se reseñó el libro: Luis Cernuda. Désolation de la Chimère. Rencontres à l'Orangerie.
Esperanza Lara Velázquez, Catálogo de los artículos de José Juan Tablada en publicaciones periódicas mexicanas (1891-1945). UNAM, México, 1995; 270 pp. (Bibliohemerografía mexicana, 1).
Authors: Rivas Velázquez Alejandro
Published: August 2017

Se reseñó el libro: Catálogo de los artículos de José Juan Tablada en publicaciones periódicas mexicanas (1891-1945).
El abad, su manceba y un acertijo folclórico paneuropeo glosado por Sebastián de Horozco
Authors: Pedrosa José Manuel
Published: August 2017

En este número no se incluyeron resúmenes ni palabras clave.
Editorial
Authors: Prado João Batista Toledo , Ribeiro Jr. Wilson Alves
Published: August 2017

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Discursos ciceronianos: a oratória como estratégia política na Roma Antiga
Authors: Lima Marinalva Vilar de , Cordão Michelly Pereira de Sousa
Published: August 2017

O ensaio discute a personagem de Cícero a partir do auto-retrato por ele elaborado e das representações biográficas que lhe construíram autores de sua época e da contemporaneidade. Problematiza a escritura ciceroniana, destacando as relações que constrói entre a retórica e o exercício político. Intenciona contribuir para a construção da imagem de Cícero enquanto sujeito histórico, ainda que toque em aspectos estéticos de sua produção discursiva.
Utilization of Betel Leaf Extract as Botanical Pesticides to Control meloidogyne spp. and Tomato Plant Production
Authors: Sritamin Made , Singarsa I Dewa Putu
Published: August 2017

Meloidogyne spp. Are among the polyphagous pest that has spread around the world and has been reported to attack cultivated plants with economic values. Various ways had been applied to control the Meloidogyne spp. nematodes but has not yet showed any effective results. We are currently using synthetic pesticides because of its fast response and ability to maintain plant productions. The improper application of synthetic nematicides would have a negative impact on the environment. The aim of this research is to know the effectiveness of betel leaf concentration (Piper betel L.) to curb the development of nematodes on Root-Knot Meloidogyne spp and the growth of tomato plants. This is a descriptive research, with the utilization of betel leaf extract (Piper betel L,) by concentration treatment of 0 %, 5 %, 10 %, 15 % and 20%, each of which are repeated five times. Complete Random Sampling (CRS) with the F test is used and continued with the Duncan test at a 5% rate. The result shows that the betel leaf extract of the 20% concentration was the most effective either on the growth of plants and to the root-knot nematodes. The suppression of growth in the ground was 80,06% and the lowest was recorded with the 5% concentration ( 2,32 %); the suppression of root-knot was 45,45 % while the lowest was with the 5% concentration (12,12 %); the suppression of nematodes population in the roots was 45,45% while the lowest was with the 5% concentration (39,76 %); and last was the suppression of egg mass which was 61,73 % while the lowest was shown in the 5% concentration (18,32 %). It can be concluded in this research that the most effective betel leaf extract concentration was at 20%.Keywords: Meloidogyne spp., Piper betel L., CRS
SINTESIS NANOPARTIKEL PERAK DENGAN METODE BIOLOGI MENGGUNAKAN EKSTRAK TANAMAN SAMBILOTO (Andrographis paniculata Ness)
Authors: Purnomo Septiana Ribka , Rupiasih Ni Nyoman , Sumadiyasa Made
Published: August 2017

This study is report about the synthesis of silver nanoparticles (AgNP) using biological method (biosynthesis) using sambiloto plant extracts (Andrographis paniculata Ness). Plant part used is the leaves and extract process is done with demineralized water (aqua-dm). The synthesis is done at a ratio of AgNO3 solution with sambiloto extract solution is 10 µl : 10 ml. Characterization techniques that have been made include UV-Vis spectrophotometer, X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). The results showed that silver nanoparticles formed has absorbance of SPR (surface plasmon resonance) peak at a wavelength of about 423 nm. XRD characterization of the structure obtained FCC (face center cubic) with a lattice parameter is 4.031 Å, diffraction peaks at 2q = 38,18o, 45,81o and 64,87o each corresponding to the (h k l) of (1 1 1), (2 0 0) and (2 2 0) respectively. TEM characterization obtained that the particle size distribution is 10 – 30 nm.
PEMETAAN BAHAYA GEMPA BUMI DAN POTENSI TSU-NAMI DI BALI BERDASARKAN NILAI SEISMISITAS
Authors: Baskara Bayu , Sukarasa I Ketut , Septiadhi Ardhianto
Published: August 2017

Bali is one of the areas prone to earthquake and tsunami as being at the junction of two plates, namely the Eurasian plate and the Indo-Australian plate is located in the south of Bali and back arc trust zones are located in the North of Bali. We need research on the potential dangers of earthquakes and tsunami in Bali are based on the value of seismicity which is interpreted by the value of b and a. This study uses earthquake data on the coordinates 6?-11? SLand 114?-116? EL with 339 data that was processed using Zmap in order to obtain the value of b at 1.57 ± 0.008 and the value of a is 10.6 and maximum magnitude of 7.1 Mw. From mapping the values ??of b and a known area that has the highest value of b and a lies in the sea area to the south of Bali, Karangasem and Buleleng to the northern region of Bali. Furthermore, for mapping the tsunami in Bali using the TOAST application obtained tsunami prone areas of Bali, Kuta Beach, East Buleleng and Karangasem.
ANALISIS RISIKO BENCANA GEMPABUMI DI WILAYAH NUSA TENGGARA BARAT
Authors: Adi Kurniawan Melki , Suarbawa Komang Ngurah , Septiadhi Ardhianto
Published: August 2017

An investigation of risk identification earthquake disaster in Nusa Tenggara Barat by three factors: the danger factor of earthquakes is Peak Ground Acceleration(PGA), vulnerability factor is population density by district, as well as the capasity factors are HDI (Human Development Index) by district in the province of West Nusa Tenggara has be done. PGA value calculation was performed using the attenuation function Fukushima and Tanaka with earthquake parameter data from 1970 - 2014 with the criteria of magnitude ? 4.5mB, depth ? 60 km and the epicenter in the range of 7.5o - 12o and 115o-120o BT and  for disaster risk index calculation earthquake using AHP (Analytical Hierarchy Process). From the calculation of the obtained regions with earthquake disaster risk levels are highest are southern Dompu, Mataram, Bima, northern Bima Regency while the lowest West Sumbawa regency and southern Sumbawa regency.