bluuebunny/crossref_metadata_2025 huggingface dataset:
Improved Trust Prediction in Business Environments by Adaptive Neuro Fuzzy Inference Systems
Authors: Azadeh Ali , Zarrin Mansour , Saberi Morteza , Ebrahimi Zohre
Published: October 2017

Trust prediction turns out to be an important challenge when cooperation among intelligent agents with an impression of trust in their mind, is investigated. In other words, predicting trust values for future time slots help partners to identify the probability of continuing a relationship. Another important case to be considered is the context of trust, i.e. the services and business commitments for which a relationship is defined. Hence, intelligent agents should focus on improving trust to provide a stable and confident context. Modelling of trust between collaborating parties seems to be an important component of the business intelligence strategy. In this regard, a set of metrics have been considered by which the value of confidence level for predicted trust values has been estimated. These metrics are maturity, distance and density (MD2). Prediction of trust for future mutual relationships among agents is a problem that is addressed in this study. We introduce a simulation-based model which utilizes linguistic variables to create various scenarios. Then, future trust values among agents are predicted by the concept of adaptive neuro-fuzzy inference system (ANFIS). Mean absolute percentage errors (MAPEs) resulted from ANFIS are compared with confidence levels which are determined by applying MD2. Results determine the efficiency of MD2 for forecasting trust values. This is the first study that utilizes the concept of MD2 for improvement of business trust prediction.
Teaching E-Business Communications to Executive Masters of Business Administration (MBA) and Human Resource Management (HRM) Learners and Professionals
Authors: Barrett Bob
Published: October 2017

Communication problems in today’s business world constitute the cause for chaos, conflicts, and sometimes corruption on the behalf of employees and leaders when there is a lack in certain skills sets, ethical and logical reasoning, and overall understanding of the role and function of modern-day communications.  Consequently, many communication problems can be prevented with proper standards and procedures. Many executive Masters of Business Administration (EMBA) and Human Resource Management (HRM) programs are now including business communications or components thereof communications and their program offerings. This paper will look at how technology has impacted communications in today’s workplace, as well as how the skill sets of leaders, managers, and employees do affect the communication process. Therefore, a special emphasis will be placed on use of technology, use of electronic communications, and overall training of human capital in today’s organizations. Finally, this paper will address how one university has approached the teaching of business communications with an emphasis on electronic communications in the workplace
Stock Market Volatility, Recurrence Interval and Memory Effect
Authors: Chi Zhang
Published: October 2017

The stock market volatility in 2015 has caused serious damage to investors and the market has also suffered severely and immensely. During the last year, large volatility and extreme events were increasingly frequent than before, which made great theoretical and practical significance to gain a deep understanding of extreme value statistics of the volatility. Extreme events also bring huge risk to financial market, therefore the risk prevention, estimation and prediction are of necessity.The research uses 1-min high-frequency datasets of Shanghai 50 Stock Index Futuresin 2015. The data comes from Tongdaxin Database. The paper is the first one to study Shanghai 50 Stock Index Futures and a relationship between recurrence interval and risk estimation has been constructed. We find the recurrence interval of stock volatility can be fitted with stretched exponential function and the recurrence interval decreases when the threshold decreases. Then we demonstrate the existence of short-term and long-term correlations in recurrence intervals. We further construct a hazard function and define a loss probability to evaluate risk and find a crossover point in the loss probability plot. The study would enable one to improve risk estimation andthere are some shortcomings and need to be perfect in the future.
Ultrasonic Fluid Level Measuring Device
Authors: Suleiman Manir , Saidu G. I. , Ilyasu M. I. , Adeboye O. A. , Hamza M.
Published: October 2017

Accurate measurement of fluid level is very vital both in industrial and consumer market. Ultrasonic technology is one of the solutions used by the industry. However, an optimized balance between cost and features are a must for almost all target applications. The ultrasonic level measurement is used mainly when a non-contact measurement is required. Precise measurement of low-range distance (level) is the main objective for this project. This device can measure level in the range of 0.02m to 4m with an accuracy of 1cm. This measuring system is based on ultrasonic sound utilizing an Atmega328P low-power microcontroller. The system transmits a burst of ultrasonic sound waves towards the subject and then receives the corresponding echo. An HC-SR04 ultrasonic Module is used to both generate and detect the ultrasound required for level computation. The time taken for the ultrasonic burst to travel the distance from the system to the subject and back to the system is accurately measured. This level is displayed on an alphanumeric LCD with an accuracy of ± 2.5cm. The minimum depth that this system can measure is 2cm and is limited by the transmitter's transducer settling-time. The maximum height that can be measured is 4 meters. The amplitude of the echo depends on the reflecting material, shape, and size. Sound-absorbing targets such as carpets and reflecting surfaces less than two square feet in area reflect poorly. The maximum measurable range is lower for such subjects. If the amplitude of the echo received by the system is so low that it is not detectable by the ultrasonic module, the system goes out of range. This is indicated by displaying the error message OOR (Out-of-Range) on the LCD.
Requirements Engineering Practice to Improve Project Performance and Competitive Advantage
Authors: Yang Li-Ren
Published: October 2017

Poor project requirements engineering (RE) practice is one of the major causes of project failure. However, many organizations do not adequately manage a project's requirements leading to a poor design basis. The primary purpose of this research was to investigate the associations among RE practice, project performance, and competitive advantage. The second objective was to evaluate the mediating effect of project performance on the relationship between RE practice and competitive advantage. The third objective was to determine whether the impact of RE practice on project performance was moderated by project type. The results suggest that RE training and improvement may contribute to project performance. In addition, project performance has a significant effect on competitive advantage. The testing also supports a role for project performance as a partial mediator in the relationship between RE practice and competitive advantage. The findings also indicate that project duration has a moderating effect on the relationship between RE practice and project performance. The research results offer guides to software development process. Findings from this study are helpful to project managers and project planners in deciding whether to adopt RE practice in software development process. Project planners can use the research results to modify their current process.
Investigate Economical Decision System Framework to Support Gas Crisis - Case Study: UAE
Authors: Wafik Doaa , Tharwat Assem
Published: October 2017

Decision Support Systems (DSS) are mainly computer based applications include essential component called Database to support rational Decision Making process by analyzing, determining and evaluating the available raw data, documentations, knowledge to reach rational alternative set of actions, identify and solve business problems, and present various economical business decisions. UAE has been determine more than ten years ago a clear strategy to reduce the dependency of their GDP on Oil products. The main aim of this paper is to analyze the UAE’s oil independence strategy and to propose a Decision Support Framework (DSF) generalizing their excellent perspective for the other oil producer countries to determine the most appropriate economical alternative solution as a substitute for a Gas Crisis. In this article, one of the famous DSS is used; Group Decision Support system is the most suitable tool for the investigated problem to build an effective Decision Support to help the oil producer countries for the sack of their GDP’s oil independency.The proposed DSF will help the users to achieve their main competitive advantage through effective acts in innovation. Its simulate the UAE strategy through the new technologies as well as modern techniques that used to create new things has never been made before and can be recognized as a unique product. This article introduced a DSF to support the oil producer countries to diversify their GDP resources and to reduce its oil dependency.
The Use of a Delphi Survey to Create a Forecasting Model Regarding the Impact of Fluctuations of the Baht on Tourism in Thailand
Authors: Thongchaichirapha Natawan
Published: October 2017

Despite the vast research by inbound and outbound tourists does impact of Thai currency, little is known about the perspective of Thai baht fluctuation, officially that relate to Banks, tourists company and Thailand economics. The overall image that emerges from literature is directly result  effects. This study recover the data of semi-structure questionnaire for create a forecasting model through Delphi survey. This survey method will useful to justify the main factors that refer to the objective of this research. To create forecasting model for tourists was based on Thai baht fluctuation demanded on two examine impacts from inbound and outbound tourists. In additional methodology, data collectives is another method that ensure to support research  more reliable enough on forecasting model. In seven panelists of participant contributed knowledge and expertise in the subject of government, tourism and financial, For Delphi survey methods were conducted in three round of Delphi survey panel, in each round have different questions depends on previous round result. Which mean, on first round is important to start to vary connected the final round of questions adjust. Even though, the result might have lack of consensus result because the participants had a different ideas to investigate answered questions but look forward on percentage result significantly that for economics change were main factor that impact also contribute to baht fluctuation on tourism in Thailand.
Assessment: ICT Infrastructure in Support for E-Learning Environment at Isabela State University System: Management, Learning and Improvement
Authors: Ravana Sherwin S.
Published: October 2017

This is a study on the assessment of e-learning services and how it is learned, managed and improved in order to gain enriching ICT e-services of the Isabela State University (ISU) system aided by its ICT Infrastructure. It aimed at determining the status of ICT Infrastructure of ISU Campuses in terms of peopleware, hardware, software and network; it also assessed the quality of the ICT infrastructure in terms of efficiency, reliability, speed and accuracy as per assessment of the respondents; and it identified innovative plans than can strengthen the ICT infrastructure.The researcher used the descriptive correlation research method. It is in this method that demographic data of the deans, chairmen, and ICT faculty members of the nine campuses of ISU and the data on the leveling of ICT infrastructures and e-learning environment are considered and correlated and took the form of survey questionnaires and actual inventory to verify the infrastructure. Considered in the assessment of the e-services are factors for the success of e-learning or flip classroom such as finance, executive support, readiness of the lecturers and students, readiness of technicians and evaluation and follow-up (as cited in Rueangprathum A.(2005).   As per result of the study, it revealed that ISU System’s ICT Infrastructures to e-learning services had the above standard but with minor issue as to licensed software; below standard in hardware; and above standard in peopleware. Likewise, there is a well-established local area network at ISU Systems even without the connection of internet. Conversely, the main server used the two-layered characteristic of the CISCO network model. Additional findings revealed that ISU system had already acquired servers and CISCO routers and switches and ready for deployment to other mother cluster. However, it was found that interconnectivity for the nine (9) campuses is NOT POSSIBLE due to a weak internet provider.
Carlos Fuente Lafuente, Protocolo para actos oficiales, Barcelona, UOC, 2017. p. 222
Authors: Sánchez-Bayón Antonio
Published: October 2017

Reseña bibliográfica
The effect of inhaling mercury (Hg) on the hepar cells and the role of green tea extract as antioxidant
Authors: Afriza Dhona
Published: October 2017

This research aimed to identify the effect of inhaling mercury on the hepar cells of white mice and the role of green tea extract as an antioxidant on such hepar cells having exposed to mercury histopathologically. It was an experimental research by using 48 male white mice (Mus musculus) as the sample. The sample was divided into 8 groups i.e.: A, B, C, and D, which were given treatment for 3 and 6 weeks. Each group consisted of 6 mice. A group was a negative control which did not get any treatment. Group B as a positive control group was exposed to mercury. Group C was exposed to mercury and was given green tea extract at dosage 0.52 mg/20 gr of body weight. Group D was exposed by mercury and was given green tea extract at dosage 1.04 mg/ 20 gr of body weight. All white mice in the group B, C, and D were exposed to mercury through inhalation for 4 hours daily. To identified the effect of mercury, the hepar cells in all 4 groups were examined at the 3rd and 6th week by making histopathologic preparation in the Histopathology Laboratory Faculty of Medicine Universitas Andalas. Then, the preparation was examined through Binocular Light Microscope in ordered to see the deficient occurred. The data obtained were analyzed by ANOVA method and independent T-test with confidence level = 95%. It was revealed that the hepar cells that were being exposed to mercury regularly were being degenerates. Then, the amount of green tea extract given reduces the degeneration occurred.
Role of Streptococcus Anginosus on the formation of dental caries
Authors: Nonong Yetty Herdiyati , Satari Mieke Hemiawati , Sasmita Inne Suherna
Published: October 2017

Generally, the etiology of dental caries is the cariogenic properties of bacteria, these are always associated with Streptococcus mutans. Glucosyltransferase fragment (Gtf) are also in other strains of Streptococcus such as Streptococcus anginosus, Streptococcus milleri which includes beta hemolysis. Genotypically B Streptococcus anginosus has genetic characteristics that are similar to Streptococcus mutans. The research objective was to determine the existence of Gtf B/C gene as a cause of caries in Streptococcus anginosus. The study was conducted in experimental laboratories with PCR technique by taking a sample of 20 children who had caries. The results showed there was the amplification of Streptococcus anginosus with a level of homology 96%, 97%, and 99%. The results of the Gtf genes amplification fragment B/C provided 600 pb ribbon. The conclusion was Streptococcus anginosus classified as cariogenic bacteria because they had Gtf B/C genes.
Denture adhesive antifungal potency towards the growth of Candida Albicans
Authors: Dewi Siti Utami , Sumarsongko Taufik , Dewi Warta
Published: October 2017

Denture adhesive is a device that applied to the base of a denture before the denture is inserted into the mouth. The device used to improve denture retention and stabilization. It was thought that added antifungal agent to denture adhesive might be an effective way to inhibit the growth of Candida albicans and prevent denture stomatitis.The study was performed as an experimental laboratory study by an observed antifungal test of denture adhesive against Candida albicans growth using Kirby Bauer diffusion agar method with 5 samples and 3-time repetitions. The conclusion of this study was that the antifungal agent in denture adhesive containing poly (methylvinylether/maleic acid), sodium-calcium mixed partial salt and propyl hydroxybenzoate and denture adhesive containing sodium carboxymethylcellulose couldn't inhibit the growth of Candida albicans.
Kemampuan Pemecahan Masalah Siswa melalui Pendekatan Contextual Teaching and Learning di Kelas X SMK Negeri 1 Bireuen
Authors: Setiawati Diah
Published: October 2017

This study aimed to determine: (1) the difference upgrades between the problem solving ability of students receiving learning approach through Contextual Teaching and Learning (CTL) and students receiving learning through conventional learning, (2) interaction of learning approach and early mathematics ability (high, medium and low) to increase students' problem-solving abilities. This study is a semi-experimental study. The study population was a class X student of SMK Negeri 1 Bireuen, and analysis with two lines ANOVA analysis and t-test. The results showed that (1) there are differences in improvement between the students' problem-solving skills that students acquire learning approach CTL with increased problem-solving ability of students receiving conventional learning, (2) there is no interaction between teaching approaches used and early math abilities of students to increase students' problem-solving abilities.
Meningkatkan Kemampuan Representasi Matematis melalui Penerapan Model Problem Based Learning
Authors: Fitri Nurul , Munzir Said , Duskri M.
Published: October 2017

The ability of representation is one of the important components to develop students' thinking skills, because this capability is instrumental in helping students to transform abstract ideas into real idea and it can train students to improve problem solving skills with a variety of forms including pictures, diagrams, mathematical expressions, or words or written text. One model of learning that increases the ability of the mathematical representation is a learning model of problem-based learning. This research aims to: 1) determine a mathematical representation increased ability of students taught with problem based learning models 2) the interaction between the learning model of problem-based learning and grouping of students to increase the ability of the mathematical representation. This research is a quantitative research with an experimental method, that has pretest-posttest group design. The population was all students of class X SMA UnggulPidie Jaya by samples of two classes, namely class X3 as an experimental class and class X2 as the control class. The data collection was done by using test. Then analyzed by t -test and ANOVA at the 0.05 significance level after testing prerequisites are met. Based on the analysis we can conclude that: 1) to improve the mathematical representation of students who applied learning model of problem based learning is better than an increase in the ability of the mathematical representation of students who received conventional learning. 2) there is no interaction between the learning model and grouping of students to increase the ability of mathematical representation.
Intuisi Siswa SMK dalam Memecahkan Masalah Matematika Ditinjau dari Kemampuan Matematika dan Perbedaan Gender
Authors: Nazariah Nazariah , Marwan Marwan , Abidin Zainal
Published: October 2017

Mathematics learning activities would not be separated from the problem of mathematics. The  mathematical will be a problems if  in solving  problem  students does not immediately know the answer, but it takes time to think what steps should be taken to resolve the issue. In fact, many students are good at solving mathematical problems often use smart ways beyond of expectations and habits, thereby providing a short and accurate answer. in contrast to the students who have moderate or low mathematical ability, the way that used to solve the problem tend to give answers  lengthy and sometimes less accurate, although many low of  students math skills who have difficulties to find a way to solve mathematical problems. It showed that, there is a correlation between mathematical abilities of the students with intuition that students use in solving mathematical problems. On the other hand, the gender factor influencing the way to gain knowledge of mathematics. The influence of the gender factor in the process of conceptualization showed that gender may affect the use of intuition in understanding mathematical concepts. The aims of this study is to determine the differences between women's and men’s intuition on vocational students who have a high level of mathematical ability, medium and low in mathematical problem solving. This study used a qualitative approach with descriptive research  without the use of statistical analysis. the population is a whole class X SMK 1 Banda Aceh by taking six subjects consisted of 3  male and 3 female subjects at various levels, through learning achievement tests and consultation with subject teachers. Data collected by using a test instrument covering mathematical problem solving ability test and an interview. Based on this research, note that: 1) The differences characteristic between women and men on the subjects intuition  in solving mathematical problems by using  solving Polya; 2) the differences intuition subjects  between men and and women in solving mathematical problems by solving Polya; 3) There are differences intuition on various materials.
ENADE - EXAME NACIONAL DE DESEMPENHO DOS ESTUDANTES - E A VISÃO INTERDISCIPLINAR NO PROCESSO DE ENSINO
Authors: Beber Bernadétte , Silva Eduardo , Bonfiglio Simoni Urnau
Published: October 2017

A avaliação da aprendizagem é a forma de verificar o conhecimento produzido durante o processo de formação educacional. Dentre os variados instrumentos de avaliação, a prova interdisciplinar trata do conhecimento entre as disciplinas curriculares, estabelecendo relação de análise e interpretação de conteúdo. O objetivo deste artigo é analisar a prova interdisciplinar dos acadêmicos das 1ª, 2ª, 3ª e 5ª fases do curso de Pedagogia, realizada em junho de 2014 em uma Instituição de Ensino Superior – IES do Vale do Itajaí (SC). Para o estudo, foram utilizados os dados fornecidos pela Assessoria Pedagógica da respectiva instituição. A análise dos dados recebeu tratamento quanti e qualitativo para demonstrar a evolução da aprendizagem dos acadêmicos nas respectivas fases.Palavras-chave:  Avaliação da aprendizagem. Prova interdisciplinar. Ensino superior.
APRENDIZAGEM ONLINE NA PERSPECTIVA TRANSDISCIPLINAR
Authors: Oliveira Werley Carlos , Di Grado Ana Hessel
Published: October 2017

Resumo Pensar o desenvolvimento de um curso no formato eletrônico na perspectiva do pensamento complexo de Edgar Morin remete à busca pela compreensão da transdisciplinaridade e como ela se apresenta desafiadora e inovadora para as reflexões acerca de assuntos que fazem parte de ambientes educacionais corporativos. Este artigo pretende elucidar o conceito da transdisciplinaridade que se apresenta em três pilares: a complexidade, a lógica do terceiro incluído, e os diferentes níveis de realidade. Esta pesquisa visou a analisar, à luz dessa teoria, as experiências desenvolvidas no SESC-SP com funcionários que participaram de curso de formação no formato e-learning associado a fórum de discussão. Os dados analisados foram coletados no ano de 2015, e a análise considerou os princípios da transdisciplinaridade tendo como ênfase as interações realizadas em ambiente virtual de aprendizagem. Os resultados demonstraram expressivos índices de concordância dos alunos em relação às questões apresentadas, o que nos permite reconhecer nessa metodologia de ensino/aprendizagem princípios intimamente relacionados com as questões transdisciplinares. Resumo  Pensar o desenvolvimento de um curso no formato eletrônico na perspectiva do pensamento complexo de Edgar Morin remete à busca pela compreensão da transdisciplinaridade e como ela se apresenta desafiadora e inovadora para as reflexões acerca de assuntos que fazem parte de ambientes educacionais corporativos. Este artigo pretende elucidar o conceito da transdisciplinaridade que se apresenta em três pilares: a complexidade, a lógica do terceiro incluído, e os diferentes níveis de realidade. Esta pesquisa visou a analisar, à luz dessa teoria, as experiências desenvolvidas no SESC-SP com funcionários que participaram de curso de formação no formato e-learning associado a fórum de discussão. Os dados analisados foram coletados no ano de 2015, e a análise considerou os princípios da transdisciplinaridade tendo como ênfase as interações realizadas em ambiente virtual de aprendizagem. Os resultados demonstraram expressivos índices de concordância dos alunos em relação às questões apresentadas, o que nos permite reconhecer nessa metodologia de ensino/aprendizagem princípios intimamente relacionados com as questões transdisciplinares.
APRENDIZAGEM BASEADA EM PROJETOS: UMA EXPERIÊNCIA EM SALA DE AULA PARA COMPARTILHAMENTO E CRIAÇÃO DO CONHECIMENTO NO PROCESSO DE DESENVOLVIMENTO DE PROJETOS DE SOFTWARE
Authors: Campos Aline De , Bertoni Machado Guilherme , Varvakis Rados Gregório Jean , Todesco José Leomar
Published: October 2017

Este artigo consiste em apresentar a adequação da Aprendizagem Baseada em Projetos (Project-Based Learnig - PBL) para a criação e compartilhamento do conhecimento, entendido como o conjunto de saberes, habilidades e competências, em uma disciplina do Curso Superior de Tecnologia em Análise e Desenvolvimento de Sistemas da Faculdade Senac Porto Alegre. A utilização da PBL serve como facilitadora para que alunos possam, conforme a ementa da disciplina denominada Projeto de Desenvolvimento, simular uma experiência de participação em um projeto de desenvolvimento de software. Sendo assim, todos os objetivos e métodos que compõem essa unidade curricular foram definidos ao encontro dos processos que se fazem presentes no desenvolvimento de software atualmente, tendo em vista as melhores práticas que possam trazer vivências condizentes com o que será exigido dos egressos no mercado de trabalho. Palavras-chave: Aprendizagem baseada em projetos. Compartilhamento do conhecimento. Desenvolvimento de software. Metodologias ativas. Gestão de processos.
A UTILIZAÇÃO DOS MAPAS CONCEITUAIS NA FORMAÇÃO CONTINUADA DOS PROFESSORES UNIVERSITÁRIOS
Authors: Fontanini Carlos Augusto , Krast Jakeline , Bomfim Emerson Luiz
Published: October 2017

Esta pesquisa objetiva identificar as contribuições dos mapas conceituais na formação continuada de professores universitários, em uma Instituição de Educação Superior privada de grande porte no estado do Paraná. No referencial teórico, foram apresentadas algumas definições sobre mapa conceitual, sua construção e utilização em sala de aula. Esta pesquisa foi desenvolvida a partir do Seminário de Aprofundamento, do qual participaram do processo de investigação oito professores universitários, doutorandos no stricto sensu em Educação. A pesquisa caracterizou-se como uma pesquisa-ação. Com base nos mapas conceituais produzidos pelos doutorandos e disponibilizados no ambiente virtual de avaliação da universidade, foi feita uma análise de conteúdo destes materiais para identificar as contribuições de sua utilização e sua aplicação em suas atividades diárias docentes. Com a análise dos resultados, foi possível perceber as contribuições da utilização dos mapas conceituais e sua importância no processo de ensino-aprendizagem.    Palavras-chave: Mapas conceituais. Saberes docentes. Formação docente.
Metaliteratura e ideología: Apuntes para una teoría
Authors: Ríos Felipe
Published: October 2017

En este ensayo se examina una dimensión olvidada del nivel metaliterario que todo texto trae consigo: su posibilidad de trabajar, desde allí, un análisis ideológico. Se asume así como el marxismo y el psicoanálisis entienden este procedimiento: una des-fetichización de la ilusión del producto. Con el neologismo de literutopía se entenderá, en este trabajo, lo que tanto la educación contructivista como la lógica del mercado del libro quieren hacer pasar por literatura: una obra donde el flujo literario ha detenido su devenir. La metodología aquí propuesta se revuelve contra eso y, echando mano al arsenal crítico del postestructuralismo, busca articular una herramienta para enfocar mejor un fenómeno que la propias letras hispanoamericanas han entregado en las últimas décadas: que la literatura, acostumbrada a mostrar pero no a mostrarse, tiene en la metaliteratura su posibilidad de revelar los códigos y volver a plantearse su identidad.
Matrices de humo: Función y naturaleza de los manifiestos vanguardistas en Latinoamérica y Europa
Authors: Uribe Christopher
Published: October 2017

El presente artículo discute algunas de las principales problemáticas en torno al estudio de las vanguardias (y al uso mismo del término aglutinador vanguardia), proponiendo el estudio de los manifiestos como una posibilidad de establecer un diálogo entre las vanguardias latinoamericanas y europeas. A través del análisis comparativo de un corpus selecto, se proponen diferencias fundamentales en el uso y constitución de los manifiestos redactados por grupos latinoamericanos de vanguardia, en contraste con aquellos producidos en Europa.  
Borges hereje: el ensayista y la superstición del nacionalismo
Authors: González Felipe
Published: October 2017

El siguiente trabajo pretende evidenciar cómo en su ensayo “La supersticiosa ética del lector”, del libro Discusión (1932), Jorge Luis Borges (1899-1986) recurre al género ensayístico para oponerse, en el ámbito de la crítica literaria, al nacionalismo que comienza a imperar en esos años en Argentina. Para ello, se realiza un análisis dividido en tres apartados. El primero examina el texto a la luz de las reflexiones de Georg Lukács, Theodor W. Adorno y Martín Cerda en torno al carácter “herético” del ensayo respecto del pensamiento “doxologizado”. El segundo apartado lo enmarca históricamente para dar cuenta de su particular “herejía”, teniendo en cuenta los intereses que caracterizaron al ensayo latinoamericano de la primera mitad del siglo XX. Por último, y recurriendo a la teoría de José Luis Gómez Martínez, el tercer apartado describe en detalle cómo “La supersticiosa ética del lector” utiliza las estrategias discursivas propias del género ensayístico para efectuar su crítica. 
First Nano-Infrared Spectroscopy and Imaging Measurements of Single Phospholipid Bilayers
Authors: Cernescu Adrian , Szuwarzyński Michał , Kwolek Urszula , Wolski Karol , Wydro Paweł , Kepczynski Mariusz , Wytrwał-Sarna Magdalena , Zapotoczny Szczepan , Nowakowska Maria , Quaroni Luca
Published: October 2017

Scattering-mode Scanning Near-Field Optical Microscopy (sSNOM) allows one to obtain absorption spectra in the mid-IR region for samples as small as 20 nm in size. This configuration has made it possible to measure FTIR spectra of the protein complement of membranes. (Amenabar 2013) We now show that mid-IR sSNOM has the sensitivity required to measure spectra of phospholipids in individual bilayers in the spectral range 800 cm-1–1400 cm-1. We have observed the main absorption bands of the dipalmitoylphosphatidylcholine headgroups in this spectral region above noise level. We have also mapped the phosphate absorption band at 1070 cm-1 simultaneously with the AFM topography. We have shown that we could achieve sufficient contrast to discriminate between single and multiple phospholipid bilayers and other structures, such as liposomes. This work opens the way to further research that uses nano-IR spectroscopy to describe the biochemistry of cell membranes and model systems.
A STUDY ON SYNTHESIS OF MCM-41 MESOPOROUS MATERIAL WITH SOURCE OF SODIUM SILICATE SOLUTION FROM RICE HUSK ASH
Authors: Đức Hoàng Văn
Published: October 2017

In the present paper, a synthesis of MCM-41 mesoporous material with the sodium silicate solution prepared from the rice husk ash as a silica source by the hydrothermal process was demonstrated. The influence of synthesized conditions such as CTAB concentration, SiO2/CTAB molar ratio, stirring time and hydrothermal time were investigated. The samples were characterized by XRD, FT–IR and N2 adsorption–desorption measurement. The obtained results showed that the samples possessed highly ordered hexagonal mesostructure with uniform mesopore size distribution in a large range of CTAB concentration (1,98-4,81% mass) and the SiO2/CTAB molar ratio (4-15). The sample had a high surface area (1071 m2/g) and large pore diameter (33,5 Å) with the molar ratio of CTAB: SiO2: H2O = 1: 6: 1000.

Keywords: MCM-41, sodium silicate solution, rice husk ash
Sistemas Eólicos de Energia Mais Leves que o Ar
Authors: Ponte André Filipe Pereira , Cerqueira José Carlos P. , Fonseca Mário André S.
Published: October 2017

Os produtores associados às energias eólicas tem nos últimos anos procurado novas formas de produção de energia elétrica mais eficientes e menos dispendiosas que as tecnologias atuais. As soluções atuais apresentam ainda elevados custos de instalação e manutenção para além de terem associadas a si o traço intermitente e irregular do seu recurso natural – o vento. Entre muitas alternativas em estudo, as tecnologias (LTA - Lighter than Air) tem merecido particular interesse devido aos anos de experiência e saber acumulado na área e muito em parte devido ás potencialidades económicas que estas deixam em aberto. A prova chega-nos por mão da Altaeros Energies, start-up fundada no MIT que já tem em fase de testes o seu primeiro protótipo BAT - Buoyant Airborne Turbine (Turbina aerogeradora flutuante).Este artigo ambiciona apresentar esta tecnologia e os seus princípios de funcionamento destas tecnologias, utilizando como exemplo o protótipo da Altaeros que será alvo de um estudo ao nível das suas características aerodinâmicas, bem como ao nível da sua viabilidade económica.
Manutenção e Diagnóstico de Avarias em Motores de Indução Trifásicos
Authors: Melo Pedro
Published: October 2017

Os motores de indução trifásicos são usados na maioria dos sistemas eletromecânicos, pelo que a sua manutenção reveste-se de enorme importância. A monitorização contínua dos equipamentos é o elemento chave dos atuais sistemas de manutenção condicionada. A análise espectral da corrente absorvida pelo motor está muito implantada na indústria, mas apresenta várias limitações. Diversos métodos de deteção e diagnóstico de avarias têm sido desenvolvidos, baseados nas múltiplas grandezas que caracterizam o funcionamento do motor. A análise no domínio das frequências, com recurso a técnicas de processamento digital de sinal, tem sido bastante explorada. Este artigo pretende focar-se nas principais causas e métodos de diagnóstico de avarias no estator e rotor dos motores de indução.
Smart City
Authors: Gonçalves Paulo
Published: October 2017

Águeda recebeu formalmente no passado mês de Março o Selo de SMART CITY assim como o prémio de inovação no que ao apoio á internacionalização das suas empresas diz respeito e ao empreendedorismo que sempre demostrou neste processo de desenvolvimento sustentável que já decorre no concelho á alguns anos.
Energia em Qualquer Situação
Authors: Gonçalves Nelson
Published: October 2017

O modelo de sociedade em que vivemos depende em grande medida de uma fonte de energia elétrica ininterrupta, estável e capaz. Tanto no sector industrial, comercial como residencial, a contínua disponibilidade de energia tem um papel de extrema importância na segurança e conforto das pessoas.Assim, e nos momentos de interrupção da alimentação de energia pela rede de distribuição principal, quer por motivos de falha, manutenção ou outros, um grupo eletrogéneo de emergência apresenta-se, muitas das vezes, como a solução para o problema. Torna-se portanto vital o correto dimensionamento e instalação do equipamento de forma a garantir a longevidade do mesmo, bem como a fiabilidade e estabilidade desta fonte de energia.Iremos abordar neste artigo, de forma muito sucinta, quais os principais critérios que deverão ser tomados em conta no dimensionamento de um grupo eletrogéneo.
Palmeras aceiteras del Ecuador: estado del arte en la investigación de nuevos recursos oleaginosos provenientes del bosque tropical.
Authors: Montúfar Galárraga Rommel , Brokamp Grischa
Published: October 2017

Ecuador tiene una elevada diversidad de palmeras (Arecaceae) en su territorio (134 especies nativas), algunas de las cuales constituyen potenciales fuentes de aceites. Se realizó una revisión bibliográfica que incluyó 24 trabajos que reportan la composición de ácidos grasos y contenido de aceites de frutos de palmeras pertenecientes a los géneros Astrocaryum, Attalea, Bactris, Cocos, Elaeis, Euterpe, Mauritia, Oenocarpus, y Phytelephas. En base a los análisis de PCA y UPGMA, se observa que los aceites derivados de palmeras pueden clasificarse primariamente en función del tejido de aislamiento: (a) aceites derivados de mesocarpo ricos en ácidos grasos mono-insaturados (MUFAs), y (b) aceites derivados del endospermo ricos en ácidos grasos saturados (SFAs). En particular, el mesocarpo de Phytelephas aequatorialis y el endospermo de Mauritia flexuosa tienen una elevada proporción de ácidos poli-insaturados (PUFAs). A pesar del potencial de los aceites derivados de frutos de palmeras como nuevas fuentes oleaginosas; limitaciones en la productividad de aceite, en el manejo, extractivismo de especies dioicas, y la conservación de los recursos fitogenéticos requieren ser estudiados
La placa del techo del gastrocele de Epipedobates tricolor (Anura: Dendrobatidae)
Authors: Sáenz Ponce Natalia , Arias Contreras Michelle , M. del Pino Eugenia
Published: October 2017

En la mayoría de los vertebrados usados como modelo del desarrollo, la determinación de la asimetría izquierda-derecha de la localización de órganos tales como el corazón se determina en la neurula y obedece a un flujo de fluido hacia el lado izquierdo. El flujo de fluido está guiado por el movimiento sincronizado de cilios en el techo del gastrocele, que corresponde a la cara interna del techo de la neurula de los anuros. Se estudió la morfología de la neurula y la placa del techo del gastrocele del anuro ecuatoriano, Epipedobates tricolor (Dendrobatidae).

La placa del techo del gastrocele de la neurula de E. tricolor reviste dorsalmente a la cavidad del gastrocele y consiste de un epitelio monociliado, como en Xenopus laevis y otras ranas. La longitud de los cilios de E. tricolor fue de 8 μm en promedio. La placa del techo del gastrocele de E. tricolor comparte las características morfológicas observadas en la rana dendrobátida, Epipedobates machalilla y otras ranas con diversos modos reproductivos. La comparación sugiere que E. tricolor mantiene el mecanismo de flujo de fluido guiado por cilios para la determinación de la asimetría izquierda-derecha, como en otros anuros
Estudio de genética poblacional de Polylepis pauta y Polylepis serícea en Pichincha mediante la utilización de marcadores moleculares SSRs
Authors: Andrade Rosa , Jadán Mónica , Segovia Salcedo Claudia
Published: October 2017

Los bosques de Polylepis son centros de biodiversidad con alto impacto antropogénico. En nuestro país no existen estudios de estructura genética en el género, información indispensable para su conservación genética. El presente estudio se centra en dos especies con conflicto taxonómico: P. pauta y P. sericea en la provincia de Pichincha (Yanacocha, Mojanda y Cayambe-Coca). En total se analizaron 142 individuos de las tres poblaciones. El ADN se extrajo mediante el método CTAB para luego amplificarlo con cinco microsatélites diseñados para este género. Se detectaron 18 alelos compartidos entre las dos especies. El análisis mediante Structure reveló la existencia de dos grupos.

El primero conformado por Cayambe-Coca y Mojanda y el otro por Yanacocha. Los valores de heterocigocidad observada (Ho) en Cayambe-Coca, Mojanda y Yanacocha fueron de 0.576 y 0.299. Mientras que la esperada (He) fue de 0.605 y 0.524. La mayor diferencia corresponde a Yanacocha y se puede atribuir a la selección a favor de un alelo o endogamia. Mediante análisis de diferenciación se comprobó que ambos grupos son diferentes con p=0.00072 (α=0.05). AMOVA mostró que la mayor variación corresponde a dentro de las poblaciones (88 %). El análisis de agrupamiento detectó dos grupos: el primero conformado por Cayambe-Coca y Mojanda, y el segundo por Yanacocha.

Sin embargo, se detectó un agrupamiento diferente para la subpoblación Mojanda 1 (P. pauta x P. incana). No se encontró correlación entre distancia genética y distancia geográfica. En este estudio se pudo diferenciar a ambas especies molecularmente, por lo cual se demuestra que los SSRs diseñados fueron marcadores poderosos en análisis de diversidad, diferenciación y estructura en este género.
Obtención de embriones en fase cotiledonar de Café Robusta (Coffea canephora) con el empleo de un sistema de inmersión temporal, mediante la técnica de embriogénesis somática a partir de segmentos foliares
Authors: Paredes Gabriela , Peña Cristian , Jadán Mónica
Published: October 2017

En el presente trabajo se llevó a cabo la estandarización de la fase de establecimiento, en donde la concentración de cloro 1.5 % y una inmersión de 20 minutos, resultó ser efectiva en cuanto a bajos porcentajes de contaminación y oxidación. Para la fase de inducción de callo se utilizó el medio M&S (Murashige & Skoog) con 3 % de sacarosa y 7 % de agar, con diferentes concentraciones de 2,4-D (ácido-2,4- diclorofenilacético), BAP (bencilaminopurina) y KIN (Kinetina); el mejor medio resultó ser: M&S adicionado con 0.5 mgL-1 de 2,4-D y 2 mgL-1 de KIN. Los embriones se desarrollaron en medio M&S a la mitad de la concentración sin reguladores de crecimiento; dicho medio se probó también en forma líquida en tarrinas (sistema de inmersión casero) y en un sistema de inmersión temporal automatizado (SIT), en donde el primero mostró crecimiento de embriones ya que a los 20 días se visualizaron embriones en estado globular y a las 12 semanas de cultivo se lograron obtener 611 embriones, de los cuales 15 presentaron el estado cotiledonar. El Sistema de Inmersión Temporal automatizado no mostró resultado alguno.
Caracterización de la actividad amilásica presente en extractos larvarios de dos polillas plagas de la papa: Tecia solanivora y Symmetrischema tangolias
Authors: Mora Criollo Patricia , Rodríguez Guerra Andrea , Soria Carlos
Published: October 2017

Las polillas Tecia solanivora y Symmetrischema tangolias (Lepidoptera: Gelechiidae) ocasionan daños significativos a los tubérculos de Solanum tuberosum. El objetivo de este estudio fue aislar y caracterizar bioquímicamente las amilasas presentes en los diferentes estadios larvales de estas polillas. Para efectos comparativos se extrajo las proteínas solubles de estadios larvales criados en el laboratorio para determinar espectrofotométricamente diferencias en la concentración de cada extracto. Se calculó el peso promedio de cada larva: T. solanivora resultó ser más pesada y de ella se obtuvo más proteína soluble en comparación con S. tangolias. La actividad amilásica en los extractos proteicos fue identificada mediante degradación de almidones. Extractos de los estadios IV de ambas polillas, incubados a diferentes intervalos de tiempo, presentaron actividades amilásicas diferentes, aunque resultaron bastante similares cuando se leyeron los resultados de cada extracto tarde a las 72 h. Mediante electroforesis de los extractos proteicos de las larvas de las dos especies, migraron alrededor de 11 bandas proteicas entre 225 y 10 kDa. Entre estas bandas, las amilasas fueron reconocidas en ambas especies y en los 4 estadios como bandas de 50 kDa. La(s) banda(s) probablemente isofórmicas de esta enzima aparecieron muy definidas en los estadios I y II, en contraste con las formas difusas encontradas en los estadios III y IV. La actividad amilásica no estuvo ligada a las concentraciones proteicas sino a las condiciones de reacción. El estudio sugiere la posibilidad de diseñar formas inéditas de biocontrol contra estas plagas.
Diversidad de microalgas y cianobacterias en muestras provenientes de diferentes provincias del Ecuador, destinadas a una colección de cultivos
Authors: Morales Ever , Luna Verónica , Navarro Lucía , Santana Vismeli , Gordillo Ana , Arévalo Andrés
Published: October 2017

El presente trabajo conforma un estudio sobre diversidad, identificación y aislamiento de microalgas y cianobacterias a partir de muestras de aguas continentales, termales, salobres y lodos; colectadas en 74 sitios de 25 sectores de las provincias del Carchi, Guayas, Imbabura, Pichincha y Santa Elena (Ecuador), entre octubre 2011 y abril 2012, con la finalidad de poder determinar en dichas muestras, su diversidad inicial, sucesión de estos microorganismos y la estabilidad de los consorcios entre microalgas y cianobacterias durante la fase de selección de muestras y de aislamiento para el establecimiento de una colección in vitro de cultivos de microorganismos fotosintéticos para la Escuela de Bioanálisis de la Pontificia Universidad Católica del Ecuador. De 194 muestras evaluadas, fueron aislados el 43.81 % de microalgas y cianobacterias; donde los taxones más susceptibles de ser aislados son: Chlorella, Desmodesmus y Leptolyngbya. En cambio, se mantuvo el 56.19 % como consorcios o cultivos mixtos de microalgas y cianobacterias. De estos, se cuantificaron 14 cultivos solo con cianobacterias; 40 solo entre microalgas y 55 mixtos (31 y 18, taxa de microalgas y cianobacterias; respectivamente). Los tax más frecuentes en los consorcios microalga-microalga fueron: Chlorella sp.>Desmodesmus sp. >Navicula sp.; en los cianobacteria-cianobacteria: Leptolyngbya sp.> Calothrix sp.> Nostoc sp. y en los microalga-cianobacteria: Leptolyngbya sp.>Navicula sp.> Chlorella sp.> Desmodesmus sp.> Calothrix sp. Las muestras obtenidas en la laguna “El Salado”, San Gabriel, Carchi presentaron la mayor diversidad. Mientras que, las colectadas en “Aguas Hediondas”, Tufiño, Carchi mostraron exclusividad de Dictyosphaerium sp., Microspora sp., y Mougeotia sp. La cianobacteria Leptolyngbya sp., refleja ser altamente competitiva en cultivos envejecidos y deficientes en nutrientes. Se recomienda ingresar todos los consorcios a las colecciones, dada su importancia como fuentes de biodiversidad y para estudios de fisioecología, biotecnología ambiental y agrícola.