bluuebunny/crossref_metadata_2025 huggingface dataset:
De uma sequência didática a construção de um jogo educacional digital: fazendinha matemática
Authors: Dias Gabriel Almeida , Gusmão Tânia Cristina Rocha Silva , Marques Marlos
Published: December 2017

Este artigo apresenta uma versão beta de um jogo digital, produto gerado, por uma equipe de colaboradores que faz parte do projeto “Desenvolvimento e aplicação de videogames para potencializar o ensino e a aprendizagem da Matemática na Educação Básica” da Universidade Estadual do Sudoeste da Bahia (UESB). Concretamente, apresentamos um review de nossas ações e objetivos na tentativa de transformar uma sequência didática analógica em um jogo digital educacional. Essa experiência, unindo tecnologia e educação, está sendo bastante enriquecedora e tem revelado o potencial dos jogos eletrônicos para despertar interesses e aprendizagens.
Média aritmética em livros didáticos: uma análise a partir do enfoque ontosemiótico
Authors: Santos de Pinho Marcos Antonio , Blanco Teresa Fernandez
Published: December 2017

Este artigo faz parte de nossa pesquisa de doutorado em andamento e tem por objetivo analisar o conceito de média aritmética apresentado em livros didáticos adotados no 3º Ano do Ensino Médio à luz do Enfoque Ontosemiótico da Cognição e Instrução Matemática (EOS). As ferramentas teóricas do EOS utilizadas são nomeadamente os elementos da configuração didática (situação-problema, linguagem, conceito-definição, proposições, procedimentos e argumentos). Dentro de uma abordagem de pesquisa qualitativa e tomando os elementos da configuração didática do EOS como categorias de análise, este estudo traz a análise de um dos livros didáticos adotados em escolas da rede pública e particular da cidade de Salvador, Bahia. Os resultados da pesquisa apontam que, embora o enfoque teórico dado ao conteúdo média aritmética cumpra o currículo oficial, este apresenta conflitos semióticos, sobretudo no tocante aos elementos da configuração didática denominados procedimentos e argumentos.
COMPORTAMENTO DO CONSUMIDOR: UM ESTUDO COMPARTATIVO DA (IN)SATISFAÇÃO ENTRE O COMÉRCIO TRADICIONAL E O SHOPPING CONQUISTA SUL
Authors: Leite Carlos Fernando Faria Leite Faria
Published: December 2017

O objetivo deste artigo é conhecer o comportamento do consumidor e a satisfação no consumo, tendo como unidade espacial de análise o comércio tradicional e o Shopping Conquista Sul em Vitória da Conquista - Bahia. O método escolhido é eclético e consistem em uma variada leitura em livros, artigos, teses e jornais. Contém um estudo quantitativo-descritivo, também qualitativo e documental. As análises foram confirmadas por testes de significância, confiabilidade e também medidas de dispersão e tendência central. Descobriu-se que os maiores índices de satisfação do consumidor foram para com o Shopping, tendo como melhores preditores de consumo: a infraestrutura física (estacionamento, segurança, climatização e entretenimento) e como pior atributo os altos preços. O Centro comercial teve como melhores preditores: Variedade de produtos e serviços, tradicionalismo, equipamentos públicos e bons preços. Já para o bairro Brasil, foram: Bairrismo, boa vizinhança, bairro de domicílio e cosmética pública favorável
PERCEPÇÃO AMBIENTAL DE UNIDADES DE CONSERVAÇÃO: ESTUDO SOBRE AS LAGOAS DAS BATEIAS E DO JUREMA EM VITÓRIA DA CONQUISTA (BA)
Authors: Alves Daniel Cardoso , Sampaio Andrecksa Viana Oliveira , Sampaio Vilomar Sandes
Published: December 2017

Este artigo é resultado da pesquisa que investigou a percepção ambiental dos moradores do entorno dos Parques Municipais Urbanos das Lagoas das Bateias e do Jurema (Vitória da Conquista, BA). Com base numa metodologia empírico-bibliográfica, constituída de três fases: revisão bibliográfica, pesquisa de campo (incluindo focus group) e análise de dados, discutiu-se sobre a importância da conservação ambiental a partir das percepções e representações sobre estas Unidades de Conservação (UC). O artigo, desta forma, contribui para o conhecimento de instrumentos como a influência da representação, a obrigatoriedade legal e o imperativo para a proteção dessas (UC). A análise fornece subsídios para a política ambiental da cidade, sobretudo no que se refere às subjetividades da (re)produção do espaço urbano.
2 Mulher, Língua Portuguesa, Literatura e produção textual: experiências do estágio supervisionado
Authors: De Oliveira Edmila Silva , Sanches Marília De Souza
Published: December 2017

Este trabalho relata as atividades que foram desenvolvidas durante a disciplina de Estágio Supervisionado II do curso de Licenciatura em Letras da Universidade Estadual do Sudoeste da Bahia – UESB, Campus de Jequié. Além disso, refletiremos acerca da iniciação à docência enquanto um processo indispensável na formação do professor de Língua Portuguesa e suas literaturas. A proposta ocorreu no Colégio Polivalente Edvaldo Boaventura, na turma do 2º ano A do Ensino Médio regular da rede pública estadual. Inicialmente foram realizados períodos de observação e coparticipação, nos quais foram feitas algumas reflexões a respeito de como se dá a dinâmica da escola e, principalmente, de como ocorre o processo de aprendizagem em sala de aula. Por fim, ocorreu o estágio de regência, ponto alto da disciplina Estágio Supervisionado II. As experiências evidenciaram que o contato inicial com o espaço educativo contribui significativamente tanto para a iniciação à docência, quanto para os processos de formação docente.
The role of non-controlling interests in the value relevance of consolidated financial statements
Authors: Sotti Francesco
Published: December 2017

Based on a sample of European listed companies, the present study has investigated value relevance of consolidated financial statements prepared according to IASs/IFRSs and whether presence or absence of non-controlling interests is relevant to capital markets investors. Several previous studies deal with value relevance of consolidated annual reports, but none of them considered the influence of non-controlling interests on investor’s choices. To analyze if and how minority shareholders presence can affect investors’ choices, we have analyzed the value relevance of consolidated financial statements with minorities and, on the other side, annual reports from groups without non-controlling interests. To do it, we have used a valuation framework based on Ohlson theory and we have tested our hypothesis through an Ohlson derived price model. Findings provide evidence that consolidated financial statements prepared according to IASs/IFRSs are value-relevant. Moreover, contrary to expectations, financial information related to non-controlling interests is not so significant to investors’ choices.
Board configuration and IR adoption. Empirical evidence from European companies
Authors: Alfiero Simona , Cane Massimo , Doronzo Ruggiero , Esposito Alfredo
Published: December 2017

Over the last few years, companies are increasingly international, and a growing number of stakeholders is affected by the sustainability aspects of business, resulting in significant changes in how corporate information is both perceived and published. This scenario has led to many company Boards of Directors (BoD) voluntarily adopting a new communication tool, known as Integrated Reporting, (IR) which is a single disclosure document that satisfies stakeholders’ increasing need for information. This study wants to contribute to existing literature on the relationship between corporate governance and IR, investigating if board configuration (size, gender, and average age) influences its adoption. The analysis relies on a sample of 1,047 companies from 18 European countries for the year 2015. These results show a positive relationship between the decision to adopt IR and board size and female board members, whereas the older board members have a negative effect on it. Our findings present implications both from the theoretical and practical point of view. On a theoretical level, the research confirms that board diversity needs to be analysed more in detail, because of its contribution to company’s transparency. Moreover, the results provide to standard setters and regulators a useful insight of the important distinction among various board members’ features.
Ownership structure, firm-specific factors and payout policy: Evidence from the GCC region
Authors: Al-Malkawi Husam-Aldin Nizar
Published: December 2017

This paper draws on the author’s previously published works. The purpose of this study is to examine the effect of ownership structure and firm-specific factors on the payout policy of firms listed on the largest stock market in the Gulf Cooperation Council (GCC) region namely the Saudi Stock Exchange (SSE). The paper uses a balanced panel dataset of 69 nonfinancial companies (552 firm-year observations) and employs the random effects Tobit specification. The results show that government, institutional and family ownership positively influence dividend payments in Saudi Arabia. Furthermore, dividend payments are positively associated with firm-specific factors such as profitability, firm size and firm maturity but negatively related to business risk and leverage. The findings are consistent with the agency costs and reputation hypotheses. The paper provides some practical implications for the Capital Market Authority of Saudi Arabia (CMA), corporations and investors
Effect of cash flows volatilities on current investments in companies listed on the Tehran stock exchange
Authors: Rezaei Ranjbar Hossein
Published: December 2017

The aim of the present study is to description the role of cash flows volatilities on the extent and level of current investments in companies. Research sample includes companies listed on the Tehran Stock Exchange during 2004-2014. Data have been extracted from financial statements of companies with the use of multiple linear regression and have been studied in the form of panel data. Results obtained from research hypotheses test indicate that cash flows volatilities have a positive and significant relationship with current investments in companies. Also, this relationship has been tested in two groups of companies with positive growth of cash flows and companies with negative growth of cash flows. Findings indicate that in each of these groups also there is a significant relationship between cash flows vitalities and current investments of the companies, while, the size of this relationship is larger in companies with a positive growth
The hardest cycle climb at TCC: A financial instruments case
Authors: Boehm Josefine , Voll Daniel , Zülch Henning
Published: December 2017

TCC AG is a fast-growing bicycle production company and is headed by an ambitious top management team that wants to reinforce the firm’s expansion strategy with a sophisticated financial funding scheme. However, combined with an income decline, the financing strategy unexpectedly poses an existential threat to TCC. Complex accounting questions arise including the likely breach of a financial covenant, the detailed contractual clauses of a prospectus and the execution of a debt-for-equity swap. The underlying accounting requirements cover the recognition, the measurement and the disclosures of non-derivative financial instruments according to the International Financial Reporting Standards (IFRS). To foster a holistic understanding of financial instruments, the educational resource further combines the accounting concepts with related corporate finance theory. With this integrative approach, the case intends to encourage students’ critical reflection upon the far-reaching economic consequences resulting from accounting decisions.
Guía colombiana para el diagnóstico de la deficiencia de lipasa ácida
Authors: Santamaría Escobar Alfredo , Baquero Montoya Carolina , García Bermejo Roberto , Jaramillo Villegas Adriana María , Barrios Armando , Coll Barrios Mauricio , De Vivero Camacho Rodrigo , López Panqueva Rocío Del Pilar , Márquez William , Mora Quintero Diana Victoria , Pérez Alvarez Omar , Rivera Nieto Carolina , Simancas Escalante Evelyn , Sarmiento Morengo Giomar , Ramírez Urrego Luis Carlos , Ruíz Navas Patricia , Sánchez Franco Claudia , Suárez Zamora David Alfonso , Botero Verónica
Published: December 2017

Introducción: La deficiencia de lipasa acida lisosomal (LAL-D) es una entidad de herencia autosómica recesiva que lleva a la acumulación de esteres de colesterol y triglicéridos en el hígado, bazo y otros órganos. La edad de inicio y la tasa de progresión son muy variables, lo que posiblemente sea explicado por las mutaciones presentes en el gen LIPA.  Las manifestaciones clínicas son las mismas que para otras patologías hepáticas, cardiovasculares y metabólicas, lo que hace difícil reconocerla en la práctica clínica.Objetivo: Proveer una guía que permita a los clínicos reconocer los principales grupos de riesgo en los cuales se debe sospechar LAL-D y mejorar su diagnóstico.Metodología: Este documento se diseñó como un Consenso de Expertos en el cual participaron médicos especialistas en Gastroenterología, hepatología, endocrinología, genética, patología y pediatría. Se realizó una revisión de la literatura acerca de las manifestaciones clínicas y de las herramientas para el diagnóstico de LAL-D y se siguió la metodología de técnica de grupo nominal.Resultados: Se generaron algoritmos diagnósticos por consenso para cada uno de los grupos de riesgo, que facilitaran la sospecha y el diagnóstico de LAL-D.Conclusiones: Esta guía propone algoritmos para el diagnóstico de LAL-D, basados en el consenso clínico, que buscan optimizar la ruta diagnóstica en los pacientes con esta patología.
Cómo realizar e interpretar una manometría esofágica de alta resolución usando la clasificación de Chicago 3.0
Authors: Hani de Ardila Albis Cecilia , Bernal Walter , Leguízamo Ana María , Zuliaga Claudia , Vargas Rómulo , Vergara Hernando , Ardila Hani Andrés , Costa Barney Valeria Atenea
Published: December 2017

Con la introducción de la manometría esofágica de alta resolución se revelaron patrones no identificados previamente de la función esofágica.  De igual forma, este metodo diagnóstico adiciona patrones de presión topográfica de la presión esofágica, lo que lleva al desarrollo de nuevas herramientas para el análisis y clasificación de desórdenes motores esofágicos. En la actualidad la clasificación de Chicago3.0  la herramienta  de análisis de los diferentes trastornos motores esofágicos. En Colombia, cada día se ve el crecimiento en la realización de este estudio. El artículo propone hacer una revisión de cómo realizar e interpretar una manometría esofágica de alta resolución y  clasificar los diferentes trastornos de la motilidad esofágica según  la última actualización de la clasificación de Chicago 3.0.
Precarização da formação humana: análise de matrizes curriculares de cursos de nível superior
Authors: Rodrigues Dryelle Vieira , Andrade Rafael Ademir Oliveira de
Published: December 2017

As hipóteses fundamentais deste artigo surgem dos debates da disciplina Sociologia da Educação do curso de Metodologia do Ensino Superior no Centro Universitário São Lucas. Percebe-se que há uma precarização da formação humana no ensino superior ao passo que este atende as demandas do mercado e deixam de lado as demandas de uma formação para a democracia social, como preconizam os aspectos centrais do nosso Estado. Para testar esta hipótese inicial, analisamos as disciplinas que trabalham com formação humana em dez cursos da Universidade Federal de Rondônia a partir de suas ementas e cargas horárias com o intuito de perceber a presença ou ausência dos discursos de formação humana nas diversas áreas do conhecimento. O método utilizado partiu da análise documental dos currículos e projetos político-pedagógicos disponíveis nas páginas virtuais dos cursos, primeiro inicialmente foi realizada a tabulação do percentual e depois uma análise a partir das diretrizes curriculares nacionais e outras legislações para o ensino superior. A partir dsta pesquisa concluiu-se que há um distanciamento, especialmente das graduações que não lidam com o ser humano como seus objetos diretos, na formação humana dos graduandos, caracterizando a formação para o trabalho e alienação de aspectos essenciais para a construção de uma sociedade democrática e intercultural.
SUPPORT VECTOR MACHINE IN GENDER RECOGNITION
Authors: Stawska Zofia
Published: December 2017

In the paper, Support Vector Machine (SVM) methods are discussed. The SVM algorithm is a very strong classification tool. Its capability in gender recognition in comparison with the other methods is presented here. Different sets of face features derived from the frontal facial image such as eye corners, nostrils, mouth corners etc. are taken into account. The efficiency of different sets of facial features in gender recognition using SVM method is examined.
BUSINESS PROCESS MODELING FOR THE SHARED SERVICES CENTER IN PUBLIC ADMINISTRATION. LEGAL AND IT ASPECTS IN MANAGEMENT
Authors: Tchórzewski Klaudiusz Jerzy
Published: December 2017

In the paper the concept of Shared Service Center (SSC) for public administration is introduced. Processes and models of SSC are defined, but from the point of view of one of the main purpose of public administration– delivering public services. It is proposed to, while planning and implementing SSC, not only focus on designing services for organizational units participating in the SSC, but also to design solution for e-services for citizens. So the emphasis should be put, not only on modelling supporting processes just like for planning the implementation of commercial SSC, but also on core processes. Specific legal solutions are also pointed out, which are supporting this concept, from the point of view of organization of SSC (new Polish legislation) and from the point of view of funding the development of SSC (European Union operational programs supporting e-services for A2A and A2C).
An expeirmental investigation into mechanism of high temperature steam gasification of wastewater sewage sludge
Authors: Hu Yanjun , Chen Jiang , Li Guojian , Lu Yanjun
Published: December 2017

High temperature steam gasification experiments were conducted to gasify sludge in an electrically heated tubular furnace at 650, 750, 850, 950, and 1050?C. The obtained results develop a mechanistic understanding on steam gasification of sludge from starting constituents to final products. The introduction of steam led to a steam reforming of the tar and CnHm compounds, and a partial gasification of the solid char and CH4, which contributed to the generation of rich H2 and CO. The steam gasification process can be divided into three significant stages. As temperature increased, a decreasing absorbance amount of C-Har and C-O and a large reduction of C = O were accompanied with an evident reduction of tar yield and an increasing gas yield, especially the increase of H2 and CO contents. The H2 and CO were the indicator for the occurrence of tar and CnHm steam reforming. In addition, more micro-pores generated in solid char and a sharp increase of Brunauer-Emmett-Teller (BET) surface from 24.2 m2g?1 to 75.4 m2g?1 showed the occurrence of char decomposition. An increasing content of polycyclic aromatic hydrocarbons (PAH) with 2 and 3 rings and a significant decrease of PAH with 4-6 rings in tar showed the tar cracking and reforming of non-condensable intermediates.
The transient temperature field simulation of the micro-grid inverter
Authors: Ding Li , Che Lamei , Zhang Yumin , Cao Hailin , Hao Xiaohong , Xie Weihua
Published: December 2017

For the power electronics devices with the insulated gate bipolar transistors, the thermal management is very important and necessary for the devices reliability. In this paper, power losses of the inverter were evaluated based on its electro-thermal model and control logic. Accordingly, its thermal management system using forced air cooling is designed and simulated. The transient temperature filed simulation results showed that the thermal management system is feasible and can guarantee the working temperature of the inverter. Experimental results were also obtained to verify the simulation results in this paper.
Thermal design of a plate receiver for cooling densely packed photovoltaic cells with a point focusing solar concentrator
Authors: Du Wenping , Wang Rui , Zhao Chong , Wang Yunfeng , Li Ming
Published: December 2017

The viability of a plate receiver for an array of densely packed photovoltaic cells with a point focusing solar concentrator has been investigated. A cooling receiver being similar to a multi-channel receiver was designed and a thermal resistance model was developed to optimize the geometric parameters. Furthermore, the simulation results found that when the receiver fin height, channel width, and width of the fin wall is 15, 1, and 5.8 mm, respectively, the total ther- mal resistance could be less than 4 cm2?C/W under a constant volumetric flow rate of 0.1 L/s. A physical prototype has been built according to the simulation results. A performance test has been conducted to investigate the temperature distribution and the thermal performance. The experimental results reveal that the new design of the plate receiver has a desirable working performance and it is acceptable for the cooling application of photovoltaic cells which expose to high heat fluxes.
The effect of surfactant solutions on flow structures in turbulent Rayleigh-Benard convection
Authors: Wei Tongzhou , Cai Weihua , Huang Changye , Zhang Hongna , Su Wentao , Li Fengchen
Published: December 2017

This paper presents an experimental study on the flow structures in turbulent
Rayleigh-B?nard convection with surfactant solutions. The shadowgraph
visualization was used to obtain the plumes and the velocity field was
measured using particle image velocimetry. The results show that the size of
plumes in surfactant solution case is larger than that in Newtonian fluid
case and it needs more time for surfactant solution case to start
convection. The large-scale circulation fails to form in surfactant solution
case and the convection velocity is smaller. A decrease of the measured
Nusselt number is observed in surfactant solution case. The above phenomena
are caused by the shear-shinning and elastic chara cteristics of surfactant
solution.
Quantitative comparison of incisal tooth wear in patients receiving one-phase or two-phase treatment for skeletal Class III malocclusion with anterior crossbite
Authors: Jang So-Jeong , Choi Dong-Soon , Jang Insan , Jost-Brinkmann Paul-Georg , Cha Bong-Kuen
Published: December 2017

Objectives:

The present study aimed to compare the amount of incisal tooth wear in the maxillary central incisors of patients with skeletal Class III malocclusion and anterior crossbite receiving one-phase or two-phase treatment. The hypothesis was that tooth wear would differ according to treatment modalities.

Materials and Methods:

Maxillary dental casts obtained before (T1) and after (T2) orthodontic treatment were divided into three groups. Group I consisted of casts from 21 patients (7 males, 14 females; mean age 9.8 years) who received two-phase treatment (maxillary protraction followed by fixed appliance therapy). Group II comprised casts from 37 patients who underwent orthodontic camouflage treatment for crossbite, subdivided according to age. Group IIa consisted of casts from 15 adolescents (8 males, 7 females; mean age 13.5 years), and group IIb consisted of casts from 22 adults (13 males, 9 females; mean age 24.5 years). Maxillary dental casts obtained at T1 and T2 were scanned. For each pair of digital images, T2 was superimposed on T1 using the best-fit method. Tooth wear was quantified and compared among groups.

Results:

Significantly less tooth wear was observed in group I compared to groups IIa and IIb, but no difference was found between groups IIa and IIb. Spearman correlation analysis revealed no significant correlation between tooth wear and age, treatment duration, or craniofacial morphology.

Conclusions:

Despite the long duration of early treatment, it caused less wear of the maxillary central incisors than did orthodontic camouflage treatment.
Lingual orthodontic treatment: A YouTube™ video analysis
Authors: Lena Yağmur , Dindaroğlu Furkan
Published: December 2017

Objectives:

The aim of this study was to examine the quality of information offered for patients seeking information on lingual orthodontic treatment.

Materials and Methods:

YouTube™ was searched for videos about lingual orthodontic treatment using the key word “lingual braces” from the Google Trends application. One hundred and four videos were selected to be analyzed from the first 120 results. The video content was evaluated using a 10-point score, which was used for classifying low- and high-content video groups. The video information and quality index (VIQI) was applied to determine the quality of the videos. The Mann-Whitney U-test, Chi-square test, and logistic regression analysis were used, and the Pearson correlation coefficient was calculated for statistical evaluations.

Results:

We classified 32 videos as high-content and 72 as low-content. Most videos were uploaded by laypeople (58.7%, n = 61). Definition of lingual braces and psychological impact were the most commonly discussed topics (51.0%), followed by speech performance (47.1%), pain (44.2%), tongue soreness (37.5%), and biomechanics (14.4%). Compared to the low-content group, the high-content video group had a significantly higher mean number of views (19,867.41 vs 6720.08, P = .002) and more “likes” (135.88 vs 13.01, P < .001), “dislikes” (4.34 vs 0.81, P < .001), and “comments” (26.28 vs 5.31, P = .002). There was no difference in the total VIQI score between the groups (P = .009).

Conclusions:

The content of YouTube™ videos for lingual orthodontics was generally incomplete. Most videos mentioned psychological effects, but few videos discussed the biomechanics or procedure. Orthodontists should be aware of the information available on YouTube™.
Asset Allocation Driven by Liabilities: Application to the Icelandic Pension System
Authors: Magnússon Guðmundur , Ólafsson Sverrir
Published: December 2017

In conventional portfolio management returns are maximised subject to given risk levels. In this framework the only variables of relevance are risk and returns and their interrelationship as expressed in terms of the efficient frontier. It is increasingly the view of investment managers and regulators that pension fund investment strategies need to take their liabilities into consideration when constructing investment portfolios. In this paper we compare the conventional portfolio management approach to asset allocation which aligns investment strategies to a defined liability index. We consider a numerical example based on the Icelandic public sector pension obligation index. A comparison between the conventional risk-return focused approach and the one that seeks to align investment strategies to liabilities shows that the latter approach provides superior performance on market data covering the historical time period from Jan. 2003 to Jan. 2012. The study shows that the liability driven approach performed better in the market downturn in the second half of 2008. Also, a portfolio constructed around liabilities recovered quicker in the years following the market crash.
PENGARUH ARAH VARIASI PUTARAN DAN TUMBUKAN TERHADAP PERFORMA HASIL PENYEKIRAN MENGGUNAKAN MESIN SKIR KLEP
Authors: Nugroho Eko , Saputra Didik
Published: December 2017

Motor bakar adalah mesin penggerak mula yang banyak digunakan oleh masyarakat saat ini. Motor bakar terbagi menjadi dua yaitu motor bakar dua langkah dan motor bakar empat langkah. Motor bakar membutuhkan kompresi untuk membuat bahan bakar dapat terbakar dan menghasilkan pembakaran yang sempurna. Untuk motor bakar dua langkah kompresi dipengaruhi oleh kerapatan piston dan ring piston terhadap silinder. Berbeda dengan motor bakar dua langkah, motor bakar empat langkah membutuhkan kerapatan klep dan dudukan klep. Klep dan dudukan klep adalah alat yang bekerja dan berfungsi untuk mengalirkan bahan bakar dan udara keruang bakar dan mengalirkan gas buang sisa pembakaran ke jalur keluar. Tujuan penelitian ini adalah untuk Mengetahui pengaruh variasi arah putaran terhadap hasil penyekiran, mengetahui pengaruh tumbukan terhadap hasil penyekiran, mengetahui waktu yang efektif untuk hasil skir klep yang baik, mengetahui metode yang menghasilkan penyekiran klep yang baik. Jenis penelitiaan ini adalah pengujian eksperimental metode penyekiran dengan variasi saru arah putaran dengan tumbukan, satu arah putaran tanpa tumbukan, putaran bolak-balik dngan tumbukan dan putaran bolak-balik tanpa tumbukan. Berdasarkan hasil penelitian, dengan melakukan penyekiran dengan empat metode yang berbeda. Dapat disimpulkan bahwa metode penyekiran terbaik adalah metode satu arah putaran tanpa tumbukan. dari hasil pengujian didapatkan waktu kebocoran terbaik mencapai 7,2 menit, dengan waktu penyekiran 15 menit dan memiliki tekanan sisa terbaik yaitu 23,2 psi.
PENGARUH VOLUME RUANG BAKAR SEPEDA MOTOR TERHADAP PRESTASI MESIN SEPEDA MOTOR 4-LANGKAH
Authors: Dharma Untung Surya , Wahyudi Totong Heru
Published: December 2017

Banyak macam cara digunakan untuk meningkatkan prestasi mesin sepeda motor bensin. Salah satunya dengan meningkatkan perbandingan kompresi yaitu dengan jalan memperpanjang langkah torak (stroke). Tujuan dari penelitian  ini untuk mengetahui daya dan efisiensi termal serta konsumsi bahan bakar yang terjadi setelah dilakukan modififikasi dengan cara memperpanjang langkah torak sebesar 2 mm. Pengujian dilakukan pada mesin sepeda motor bensin 110 cc dengan spesifikasi teknis standar dan berbahan bakar bensin. Dalam perhitungan untuk mendapatkan prestasi mesin dilakukan dengan beberapa cara pengujian, yaitu perhitungan volume ruang bakar, rasio kompresi, perbandingan kalor spesifik, efisiensi thermal, tekanan efektif rata-rata, dan daya spesifik, dan pengujian konsumsi bahan bakar (road test dan stasioner), pengujian akselerasi, dan pengujian kecepatan maksimum. Dari cara meningkatkan unjuk kerja mesin yang telah dilakukan, proses memperpanjang volume ruang bakar (stroke) menunjukkan pengaruh yang lebih besar, dari volume standar sebesar 97,1 cm3 dengan daya 8009 PS sebelum dimodifikasi, setelah dimodifikasi menjadi menjadi 1049 cm3 dengan daya10668 PSsehingga mengalami peningkatan volume ruang bakar, 7,8 cm3 dan daya sebesar 2659 PS, efesiensi thermal mesin, sebelum modifikasi sebesar 0,5756 dan setelah modifikasi mencapai 0,6713, konsumsi BB berdasarkan pengujian road test dengan jarak tempuh 50 km/jam sebelum modifikasi 47,33 mL meningkat menjadi 50 mL sesudah dimodifikasi, pada pengujian stasioner sebelum modifikasi 72 mL meningkat menjadi 74 mL dikarenakan volume ruang bakar yang bertambah dan membutuhkan konsumsi BB yang lebih banyak.
VARIASI JUMLAH LUBANG DAN UKURAN DIAMETER BURNER KOMPOR PREMIUM TERHADAP KONSUMSI BAHAN BAKAR
Authors: Ridhuan Kemas , Darma Ervan Septa
Published: December 2017

Komsumsi bahan bakar pada suatu kompor sangat dipengaruhi oleh beberapa hal diantaranya burnernya, khususnya ukuran diameter lubang barner dan jumlah lubangnya. Pada kompor dengan bahan bakar premium tentu ini akan berbeda hasil pembakarannya, seperti nyala api, waktu, temperatur dan jumlah panas yang dihasilkan. Tujuan dari penelitian ini adalah untuk mengetahui variasi jumlah lubang dan diameter burner kompor terhadap konsumsi bahan bakar premium dan jumlah panas yang di hasilkan. Metode penelitian ini yaitu dengan memvariasikan diameter burner 5, dan 6,5 cm, dengan jumlah lubang burner 16, 18 dan 20 buah. Ukuran diameter lubang burner 2 mm, tingi burner 44 mm, dan bahan bakar mengunakan premium. Diuji dengan memanaskan air. Hasil penelitian menunjukkan bahwa untuk diameter burner 5 cm dengan jumlah lubang 16 menghabiskan bahan bakar 160 ml, memiliki jumlah panas 1331,3 kJ. Pada jumlah lubang 18 menghabiskan bahan bakar 130 ml, dengan jumlah panas yaitu sebesar 1435,8 kJ. Pada jumlah lubang 20 menghabiskan bahan bakar 120 ml. dengan jumlah panas 1414,9 kJ. Sedangkan untuk diameter burner 6,5 cm pada jumlah lubang 16 menghabiskan bahan bakar 120 ml dengan jumlah panas 996,9 kJ. Jumlah lubang 18 menghabiskan bahan bakar 100 ml, dengan jumlah panas 1080,5 kJ. Pada jumlah lubang 20, sisa bahan bakar 80 ml, dengan jumlah panas 1128,6 kJ.
Surface Plasmon Resonance (SPR) Phenomenon of the Oxidizing and Reducing Polypyrrole
Authors: Rajabiah Nurlaila
Published: December 2017

Surface Plasmon Resonance (SPR) phenomenon of the oxidizing and reducing polypyrrole (PPy) have been observed using a modified Au/PPy Kretschmann configuration. The observation was carried out through simulation Winspall 3.02 software and compared with some experimental data refractive index (n), absorbance index (), and thickness (τ) reported in other literatures with spectroscopy ellipsometry. This simulation assumed that the SPR system use BK-7 halfcylinder prism (n= 1,515) and the laser beam was generated by HeNe (λ= 632,8 nm). The result showed that the optimum layer thickness of polypyrrole with neutral electrolyte solution in the reduction state is of about 20 nm. The polypyrrole with an acid solution in the oxidation state showed that the reflectivity curve is sharper and the width of the curve is smaller than the neutral electrolyte solution in the reduction state with the SPR angle of about 46,810 and the reflectivity value of about 0,217. Polypyrrole in a state of oxidation and reduction, related to the absorption, film thickness, and dielectric constant of materials, affected to the SPR angle shift and dip curve
Plaque distribution in common femoral artery bifurcations, based on multi-slice computed tomography assessment
Authors: Zhang Bihui , Yang Min , Zou Yinghua
Published: December 2017

Purpose: The aim of this study was to observe the exact plaque distribution at the common femoral artery bifurcation by multi-slice computed tomography angiography and to examine the relationship between plaque distribution and carina location.

Methods: Symptomatic outpatients who underwent multi-slice computed tomography angiography between May 2013 and February 2015 were enrolled in this study. The presence and distribution of atherosclerotic plaques were assessed in cross section views of vessel lumen. Each vessel lumen cross section was divided into four equal quadrants for the common femoral, superficial femoral and profunda femoral arteries. The quadrant of the superficial femoral artery in which the carina was located was also recorded.

Results: In total, 184 common femoral artery bifurcations in 92 patients were analyzed. Normal arteries were more common in profunda femoral arteries than in common femoral arteries and superficial femoral arteries (both P< 0.001). Plaques were found more medial and posterior quadrants in common femoral arteries. In superficial femoral arteries, plaques were found most frequently in anterior quadrants (78.3%, n=144) and least frequently in posterior quadrants (49.5%, n=91). The carina was located in the posterior quadrant in 160 bifurcations (87.0%) of superficial femoral arteries. Quadrants opposite the carina contained plaque most proportionally (77.2%) and quadrants of carina were affected least proportionally (52.7%) in superficial femoral arteries (P
Adolescent obesity and the role of the fat mass and obesity-associated gene polymorphism
Authors: Çöl Nilgün , Demircioğlu-Kiliç Beltinge , Nacak Muradiye , Araz Mustafa
Published: December 2017

Purpose: The association between fat mass and obesity-associated (FTO) gene and obesity is unclear in both adults and adolescents. The aim of this study was to examine the role of the FTO gene variant rs9939609 as a candidate gene for obesity and the relationship between insulin resistance (IR), metabolic syndrome (MetS), estimated glomerular filtration rate (eGFR) and neutrophil-to-lymphocyte ratio (NLR).

Methods: Obese adolescents (n=100) and healthy controls (n=100) were included. Rs9939609 polymorphism in the FTO gene was genotyped by PCR-SNaPshot.

Results: The prevalence of insulin resistance (IR), metabolic syndrome (MetS) and hyperfiltration were 47%, 60% and 27%, respectively. There were no significant differences in genotype and allele frequencies between obese adolescents and controls; however, prevalence of MetS in female patients with A allele carriers was more frequent and prevalence of hyperfiltration was less frequent with T allele carriers (P
Use of Pain Neuroscience Education, Tactile Discrimination, and Graded Motor Imagery in an Individual With Frozen Shoulder
Authors: Sawyer Eric E. , McDevitt Amy W. , Louw Adriaan , Puentedura Emilio J. , Mintken Paul E.
Published: December 2017

Study Design

Case report.

Background

Aggressive physical therapy in the freezing stage of frozen shoulder may prolong the course of recovery. Central sensitization may play a role in the early stages of frozen shoulder. Pain neuroscience education, tactile discrimination, and graded motor imagery have been used in a number of conditions with central sensitization. The purpose of this case report was to describe the examination and treatment of a patient in the freezing stage of frozen shoulder using pain neuroscience education, tactile discrimination, and graded motor imagery.

Case Description

A 54-year-old woman with a diagnosis of frozen shoulder was referred by an orthopaedic surgeon following lack of progress after 4 weeks of intensive daily physical therapy. Pain at rest was 7/10, and her Shoulder Pain and Disability Index score was 64%. She had painful and limited active range of motion and elevated fear-avoidance beliefs. Tactile discrimination and limb laterality were impaired, with signs of central sensitization. A “top-down” approach using pain neuroscience education, tactile discrimination, and graded motor imagery was used for the first 6 weeks, followed by a “bottom-up” impairment-based approach.

Outcomes

The patient was seen for 20 sessions over 12 weeks. At discharge, her Shoulder Pain and Disability Index score was 22%, resting pain was 0/10, and fear-avoidance beliefs improved. Improvements in active range of motion, laterality, and tactile discrimination were also noted.

Discussion

Intensive physical therapy in the freezing stage of frozen shoulder may be detrimental to long-term outcomes. This case report suggests that a top-down approach may allow a quicker transition through the freezing stage of frozen shoulder.

Level of Evidence

Therapy, level 5. J Orthop Sports Phys Ther 2018;48(3):174–184. Epub 19 Dec 2017. doi:10.2519/jospt.2018.7716
Superposición de la dieta del pez león Pterois volitans (Teleostei: Scorpaenidae) con la de peces nativos de nivel trófico similar en Cuba
Authors: Pantoja Echevarría Laura María , Chevalier Monteagudo Pedro P. , Cabrera Guerra Delmis , Corrada Wong Raúl Igor , Cobián Rojas Dorka , Caballero Aragón Hansel , García Rodríguez Alain , Fernández Osoria Ramón Alexis
Published: December 2017

The spread of the Indo-Pacific lionfish has been one of the most rapid marine fish invasions in the history of the tropical and subtropical western Atlantic, and populations of this species pose a threat to native fishes feeding at similar trophic levels due to competition for food. To determine dietary overlap, 899 lionfish and 377 native fishes of the families Haemulidae, Holocentridae, Serranidae and Lutjanidae were caught in three Cuban localities, and their stomach contents were analyzed based on the number of items, frequency, volume and index of relative importance. Diet composition was similar in the studied localities; Lutjanidae, Serranidae and lionfish mainly fed on fish while Haemulidae and Holocentridae primarily consumed small benthic invertebrates. Mantel correlations showed that the consumption of fish and crustaceans did not increase as lionfish increased in size. The degree of dietary overlap between lionfish and some native fishes depends on locality, ecological zone and the characteristics of each family, confirming the opportunistic nature of the invader. It is likely that native fishes are not affected by competition with lionfish for food because they feed on the mostabundant and available organisms; therefore, food availability is not a limiting factor for these groups.
LAS PRÁCTICAS PREPROFESIONALES COMO PRINCIPAL ELEMENTO DE INTEGRACIÓN EN LA CARRERA DE EDUCACIÓN BÁSICA DE LA UNAE. BASES TEÓRICAS Y METODOLÓGICAS DE UNA NUEVA CONCEPCIÓN PARA SU DESARROLLO
Authors: Portela Falgueras Rolando Juan
Published: December 2017

Las actuales transformaciones que tienen lugar en la Educación General Básica (EGB) del Ecuador y las nuevas exigencias que tienen ante sí las universidades ecuatorianas, en particular la Universidad Nacional de Educación (UNAE), determinan la necesidad de modificaciones en las estructuras organizativas y el sistema de organización del proceso educativo de la Carrera de Educación Básica (EB) de esa institución. El artículo tiene como objetivo socializar uno de los resultados logrados en un proyecto de investigación orientado a lograr el mejoramiento de dicha carrera, cuyas bases y fundamentos se presentaron en un artículo anterior de esta revista. Aquí se presenta una nueva concepción para el desarrollo de las prácticas preprofesionales en la carrera, dada su significativa importancia como elemento de integración de la docencia, la investigación y la vinculación con la colectividad en la formación del profesional de la EGB. La concepción teórico-metodológica incluye, desde un nuevo enfoque epistemológico o punto de vista de partida, los fundamentos teóricos, los principios en que han de direccionarse las prácticas para lograr su “deber ser” en la carrera, así como sus objetivos y las consideraciones metodológicas necesarias para su implementación en el desarrollo de la carrera.
CONCEPCIÓN DIDÁCTICA PARA LA DISCIPLINA CONTABILIDAD EN EL CICLO BÁSICO DE LA CARRERA CONTABILIDAD Y FINANZAS DE LA UNIVERSIDAD DE PINAR DEL RÍO
Authors: Castaño de Armas Reinaldo , Díaz Cabrera Juan Carlos , Mena Lorenzo Jorge Luis
Published: December 2017

La investigación está dirigida a proponer una concepción didáctica para el proceso de enseñanza-aprendizaje durante el ciclo básico para los estudiantes de primero y segundo año de la carrera de Contabilidad y Finanzas de la Universidad de Pinar del Río, para ello se fundamentó una concepción didáctica sustentada en las relaciones interdisciplinarias, donde la disciplina de Contabilidad direcciona el proceso de integración horizontal y vertical, a partir de la simulación de una empresa, que permite modelar los subsistemas del sistema contable, apoyado por un sistema de medios de enseñanza que organizan y direccionan el proceso de aprendizaje. Los métodos empleados fueron: histórico y lógico, análisis y síntesis, inducción-deducción, sistémico estructural, observación, revisión de documentos, encuestas, entrevistas, los métodos estadísticos y matemáticos. Se presenta una metodología con el objetivo de implementar una concepción didáctica que permita a los profesores que intervienen en el proceso de formación del contador, utilizando los recursos metodológicos y didáctico para perfeccionar el proceso de enseñanza-aprendizaje haciendo énfasis en la impartición de talleres en la disciplina de Contabilidad, Diplomado de Actualización de los cambios en la Contabilidad a partir de la armonización de las Normas Cubanas de Contabilidad a las Normas Internacionales y de Información Financiera.
Estabilidad de taludes para un diseño de un relleno sanitario manual para una población de 5000 habitantes
Authors: Montalván Toala Francisco , Loor María , Pérez Luis , Carrión Paúl , Álvarez Alamir , Reyes Brenda , Herrera Gricelda
Published: December 2017

El presente trabajo se llevó a cabo para el estudio de estabilidad de taludes para un relleno sanitario manual, en el cual se consideró una población de 5000 habitantes, en el que, las propiedades geomecánicas utilizadas fueron: la cohesión, el ángulo de fricción y el peso específico, las cuales fueron introducidas al software Slide 5.0, mediante el método de Janbu. Las condiciones para el análisis, a las que el diseño del relleno estuvo sujeto fueron, tanto estáticas como pseudoestáticas, incluyendo niveles de saturación en la capa de residuos, provocando que ocurra inestabilidad y fallas en la geometría de los taludes. El resultado obtenido con el análisis de estabilidad de taludes, es conocido como Factor de Seguridad (F.S.) el cual  indica la ocurrencia o no de un tipo de falla que se puede presentar en el talud. Este resultado del análisis se basa en la Norma Ecuatoriana de la Construcción 2011 la cual se encuentra vigente en el país, en la que se recomienda que, para el diseño y construcción de las obras en contacto con el suelo se debe garantizar un comportamiento adecuado de las estructuras y preservar la vida humana.
Evaluación técnica y económica para dos métodos de producción de semilla pre básica de papa (Solanum tuberosum L.) bajo invernadero
Authors: García Rosero Ligia , Chuquillanqui Sotomayor Carlos , Veneros Guevara Jaris , García Aucatoma Saskia
Published: December 2017

Se evaluaron dos métodos de producción de semilla pre-básica de papa en términos de producción, costo y beneficio. Esta se desarrolló en el Centro Internacional de la Papa – Lima, en la época de verano (Diciembre- Abril) utilizando dos variedades (Serranita y Chucmarina) y dos métodos de producción (Aeroponía y Convencional). Los tratamientos se organizaron en un Diseño Completo al Azar con 4 repeticiones. Se concluyó que, el mejor promedio de tubérculos > 5g, lo presentó el sistema Aeroponía-Serranita con 324 tubérculos/m2.  El mayor promedio de tubérculos < 5g lo obtuvo el sistema Aeropónico (198 tubérculos/m2). Las altas temperaturas a las que estuvo expuesto el cultivo provocó baja productividad resultante del estrés de la planta. El menor costo total de producción por metro cuadrado (US $37.98/m2), se obtuvo en el sistema convencional en ambas variedades. El mayor ingreso total y rentabilidad lo obtuvo el tratamiento Aeropónico- Serranita con US $125.16/m2 y 66.97%.
Análisis de sensibilidad de las condiciones operacionales, geológicas y el cuidado post inyección en sitio con el riesgo asociado al secuestro de CO2 en la región sur de Estados Unidos
Authors: Arcentales Bastidas Danilo , Escobar Segovia Kenny , Medina-Rodríguez Bryan , Erazo-Bone Romel , Portilla Carlos
Published: December 2017

Para la captura de dióxido de carbono antropogénico (CO2) se debe considerar: la capacidad de almacenamiento de gas de la formación, el tamaño de la pluma de saturación y presión durante el monitoreo de la locación luego de la inyección; incluyendo los riesgos asociados con las fugas de CO2 y la reactivación de fallas. Una formación con un volumen poroso razonable sería un buen candidato para el almacenamiento de CO2, sin embargo, no todas las formaciones de alta porosidad tienen la capacidad de almacenar grandes cantidades de gas durante un largo periodo de tiempo. Esa es la mayor preocupación cuando se habla de la captura de CO2. El tamaño de la pluma de saturación y de presión durante la inyección de CO2, así como el control de la locación luego de la inyección fueron simulados en esta investigación, a través del uso de modelos de yacimientos del campo CRD. La aplicación de diagramas de Pareto y respuestas de superficie nos permitieron determinar los parámetros más importantes que afectaron a la pluma de saturación y de presión, cuantificando la correlación entre diferentes parámetros de modelos históricos ajustados y dimensionados.