bluuebunny/crossref_metadata_2025 huggingface dataset:
Análise de narrativas praxeológicas de conexões entre aritmética e álgebra
Authors: Pereira José Carlos de Souza , Santos da Silva Francisco Hermes , Viana Nunes José Messildo
Published: March 2018

Este artigo é produto de uma pesquisa narrativa autobiográfica que expõe a análise das praxeologias do primeiro autor, no contexto do seu desenvolvimento profissional, como professor de matemática. O foco da análise recai sobre os diversos conflitos praxeológicos que esse vivenciou durante a elaboração e aplicação, em sala de aula, de uma proposta didática para ensinar operações polinomiais na sétima série (oitavo ano) do Ensino Fundamental. Para analisar suas próprias praxeologias a partir da proposta didática que elaborou, esse assumiu a Teoria Antropológica do Didático (TAD) de Yves Chevallard como referencial teórico principal. Os resultados apontam que as relações pessoais do primeiro autor envolveram tipos de objetos ostensivos e não ostensivos, e tipos de tarefas e técnicas presentes ou não na proposta didática que ele elaborou, revelando as praxeologias passadas e presentes, que compunham os diversos momentos de seu desenvolvimento profissional como professor de matemática.
Aspectos epistemológicos a luz da teoria antropológica do didático subjacentes ao tema transformação linear
Authors: Matos Fernando Cardoso de , Pereira José Carlos de Souza , Nunes José Messildo Viana , Guerra Renato Borges
Published: March 2018

Nosso propósito neste artigo foi revelar os aspectos epistemológicos a luz da Teoria Antropológica do Didático  estão subjacentes ao tema transformação linear, no livro didático adotado para o ensino de Álgebra Linear no Instituto Federal do Pará, revelando indícios do modelo epistemológico dominante, analisando dois tipos de tarefas. A análise do livro didático é um referencial para a elaboração de conjecturas a respeito do tipo de ensino que está sendo desenvolvido de um determinado saber, em uma determinada instituição. A Teoria nos ajudou a discutir Organização Matemática e Didática do livro, em termos do gênero de tarefas e tipos de tarefas, técnicas e justificações da razão de ser do objeto matemático transformação linear. A razão de ser para se ensinar esse objeto se dá pela aplicação direta da definição, pois os alunos devem se perguntar ao lerem as propostas das tarefas enunciadas pelos autores, para que e porque se estudar tal temática? Algumas tarefas são resolvidas com os conteúdos vistos no ensino médio, como função como tecnologia, não deixando claro ao leitor que é uma transformação de um espaço vetorial em outro. Concluímos que nos tipos de tarefa discutidos foi possível dar indícios do modelo epistemológico dominante, o qual consideramos a utilização direta da definição de transformação linear.
A distância entre o saber acadêmico e o saber ensinado revelado em um livro didático de matemática do 7º ano: o caso da adição e subtração com números inteiros
Authors: Gonçalves Kleber Ramos , Bittar Marilena
Published: March 2018

Neste artigo apresentamos recortes de uma pesquisa que teve por objetivo compreender distanciamentos e aproximações entre a Matemática presente na construção do conjunto dos números inteiros e a Matemática proposta para o ensino das operações de adição e subtração nesse conjunto em um livro didático do 7º ano do ensino fundamental. Utilizamos a teoria antropológica do didático para estudar as tarefas, suas formas de resolução, as possíveis justificativas matemáticas e as adaptações realizadas pelos autores deste livro. A análise das praxeologias matemáticas modeladas nesse livro nos forneceu elementos para atingirmos nosso objetivo, alguns dos quais trazemos nesse artigo.
Fundamentos norteadores das teorias da Educação Matemática: perspectivas e diversidade
Authors: Almouloud Saddo Ag
Published: March 2018

O presente texto tem por objetivo tecer reflexões acerca de controvérsias sobre a pluralidade de teorias que veem sustentando a área de Educação Matemática e o que é considerado fundamental em sua constituição como campo científico. Além disso, traz à luz alguns fundamentos teóricos da Educação Matemática, com o intuito de comparar a diversidade de seus enfoques. Dividimos o texto em três partes a fim de proporcionar uma melhor visão das ideias centrais de cada uma. A primeira tratamos da Educação Matemática como campo de conhecimento, na segunda parte, discutimos os fundamentos da Educação Matemática e a diversidade nos enfoques. Na terceira parte apresentamos uma discussão e uma síntese dos diferentes construtos teóricos discutidos nas duas primeiras partes, focando no final do texto alguns aspectos da Teoria Antropológica do Didático. Este estudo, apesar de não exaustivo, permite obter uma visão abrangente das diversas teorias existentes, relacionadas ao ensino e à aprendizagem de matemática. A diversidade de teorias e as especificidades de cada uma delas vêm confirmar a ideia de que uma única teoria, ou um único modelo, dificilmente dá conta de explicar e explicitar todos os fenômenos envolvidos nos processos de ensino e de aprendizagem de matemática. O pesquisador deve procurar conhecer bem as ideias principais das diversas teorias, de modo a poder identificar quais delas poderá usar para referenciar teoricamente sua pesquisa.
Análise de erros na resolução de problemas matemáticos
Authors: Kliemann Geovana Luiza , Dullius Maria Madalena
Published: March 2018

Apresenta-se neste trabalho, uma pesquisa desenvolvida no âmbito do Programa Observatório da Educação, com o propósito de auxiliar na melhoria da qualidade dos processos de ensino e aprendizagem da Matemática na Educação Básica. A partir do estudo dos sistemas avaliativos que constituem o escopo de investigação do projeto, verificou-se que o foco destes é a resolução de problemas, desenvolveu-se então várias ações com o objetivo de auxiliar os estudantes no processo de resolução dos mesmos. Uma dessas ações objetivou analisar os erros apresentados por estudantes do 5º ano na interpretação, compreensão e resolução de problemas. Descreve-se três encontros desenvolvidos em seis escolas, com questões retiradas da Prova Brasil realizadas em anos anteriores, com o objetivo de diagnosticar as principais dificuldades apresentadas pelos alunos na resolução dos problemas, além de auxilia-los a verificar possibilidades de superar tais lacunas. Para atingir os objetivos propostos, foi realizado um estudo qualitativo em que os pesquisadores estiveram constantemente envolvidos durante o processo.  Após cada encontro, realizou-se uma análise das respostas desenvolvidas, classificando os erros cometidos em diferentes categorias. Verificou-se que a maioria dos estudantes atendidos obteve êxito na resolução dos problemas propostos, e os principais erros apresentados estão relacionados à dificuldade de interpretação.
Elaboração de estratégias de ensino e uso dos estatutos do conhecimento: os obstáculos na construção do conhecimento de Ciências-Física
Authors: Moraes Carmen Júlia Carvalho , Oliveira Carol Mesquita , Goldschmidt Andréa Inês
Published: March 2018

O artigo é fruto das reflexões e vivências do Estágio Curricular Supervisionado II de Ciências Biológicas, da Universidade Federal de Goiás, em que se discutiu o ensino de Ciências/Física para o ensino fundamental, sob uma abordagem histórica, a partir dos Estatutos do Conhecimento Biológico (ECB), Ontológico (EO), Epistemológico (EE), Histórico-Social (EHS) e Conceitual (EC), propostos por Nascimento-Jr. Essas reflexões abordam aspectos vivenciados durante o período de regência em turmas de 9º ano do Ensino Fundamental, e se relacionam ao uso de estratégias de ensino na prática pedagógica e aos caminhos possíveis para o ensino de Ciências/Física, a partir dos Estatutos do Conhecimento. Foram discutidos com os estudantes a História e Filosofia da Ciência a partir de conteúdos de eletricidade, eletromagnetismo e sistema solar, construindo uma visão não reducionista, não linear e nem a-histórica. Os desafios encontrados foram grandes, mas mostram que é possível construir estratégias que busquem desafiar a construção do conhecimento para além da transmissão de conteúdos.
Aprender como ensinar física através do livro texto de ciclo básico universitário: um fenômeno didático em questão
Authors: Yamazaki Sérgio Choiti , Angotti José André Peres , Delizoicov Demétrio
Published: March 2018

Este artigo apresenta os resultados de uma tese de doutorado que procurou investigar correlações entre a estrutura de um livro texto (manual) de Física do Ciclo Básico Universitário e certas concepções e ações docentes divulgadas há algumas décadas sobre o ensino de Física. O manual analisado é, segundo nosso levantamento, a obra mais citada em Projetos Político-Pedagógicos de cursos de Física. As análises foram sustentadas em conceitos da Teoria Antropológica do Didático (TAD). Os resultados apontam para uma interpretação segundo a qual há uma congruência entre a forma com que os conteúdos são apresentados nos livros e as noções espontâneas dos professores.
Interpretação geométrica dos signos das razões trigonométricas com Geogebra
Authors: Díaz Urdaneta Stephanie Chiquinquirá , Prieto González Juan Luis , Duarte Castillo Ana Del Valle
Published: March 2018

O ensino da Trigonométrica caracterizou-se por um enfoque algébrico, o que tem feito de seu estudo um processo memorístico e mecânico. Um conteúdo onde se pode evidenciar o anterior é o dos signos das razões trigonométricas que costuma se abordar através do uso de regras mnemotécnicas, ação que limita seu entendimento. Com a intenção de apoiar à superação deste problema, neste trabalho descreve-se o desenho de um recurso elaborado com o software GeoGebra e sua aplicação em uma sequência para analisar e dotar sentido aos signos das raciocine Seno, Cosseno e Tangente de um ângulo. O desenho do recurso baseou-se no modelo TPACK (Mishra & Koehler, 2006). Se considera apropriado que os professores contem com recursos deste estilo que lhe ajudem em suas práticas de ensino apoiadas em meios tecnológicos como o GeoGebra.
Doppler ultrasound evaluation of heptobiliary system in leopards (Panthera pardus)
Authors: Rai Omil , Chandrapuria V. P. , Shrivastav A. B. , Shukla P. C. , Rokde Amol , Jadav Kajal , GuptaSerap Atul
Published: March 2018

Ultrasonography has been considered as one of the most valuable diagnostic tools in veterinary medicine. The study standardizes the Doppler ultrasonographic hepato biliary biometric features in six leopards (Panthera pardus). The hepato biliary ultrasonographic examination was performed under general anaesthesia while lateral recumbency using a 3.5 MHz convex array transducer. The hepatobiliary images obtained at area covered the periphery just behind the sternum and last ribs of thorax on left and right side of abdomen. Gall bladder was visualized at a moderate pressure below the level of sternum. The hepato biliary measurements were recorded and it can be concluded that Doppler ultrasonography as valuable technique for measuring hepato biliary biometric features and could be used as reference values for diagnosis of hepato biliary diseases and disorders in leopards.
Presentación
Authors: Litwin Edith
Published: March 2018

Presentamos en este nuevo número seis trabajos que son fruto de las investigaciones realizadas en el Instituto de Educación de la Universidad ORT y dan cuenta de los resultados que los estudiantes del Master en Educación produjeron en la tarea desempeñada.Estos trabajos se inscriben en el marco de una nueva agenda para el campo de las preocupaciones pedagógicas y didácticas. No le son ajenos los problemas que se suscitan en las aulas contemporáneas y en los contextos críticos en los que la enseñanza se desarrolla. Se emprendieron en diferentes departamentos: Florida, Colonia, Artigas, Rivera, Montevideo; en los diversos niveles de la enseñanza: escuelas primarias, liceos -tanto en el ciclo básico como el Bachillerato Diversificado -en los Institutos de Formación Docente; en escuelas de contexto crítico, en barrios periféricos y en los centros urbanos; en Instituciones de gestión oficial y privada. Ha sido recurrente en todos los trabajos el interés por identificar las condiciones y contextos de la enseñanza y por indagar prácticas, representaciones, concepciones o estilos. En todos los casos, estas indagaciones se caracterizaron por la realización de laboriosos trabajos empíricos en el campo de estudio.
Los prácticos de laboratorio: una mirada interpretativa en prácticas de enseñanza de química en Bachillerato Diversificado
Authors: Duglio Isabel
Published: March 2018

Este artículo presenta una investigación sobre actividades de laboratorio, en prácticas de enseñanza de química en Bachillerato Diversificado. En este plan de estudios se concibe un curso práctico que se desarrolla en paralelo con un curso teórico. Compete al docente buscar estrategias que le permitan dirimir la dualidad teoría-práctica, que surge de los lineamientos curriculares. Se realiza un abordaje cualitativo del tema, en el cual se ha intentado focalizar la atención desde la reconstrucción de conocimiento y las interacciones que se observan en los prácticos de laboratorio. Con relación a la reconstrucción de conocimiento se propone: la resignificación de conocimiento cotidiano, la reformulación del error y la búsqueda de integración conceptual. Desde las interacciones, se plantea: el segmento de interacción docente – alumnos, el segmento de interacción alumnos – docente, y una interacción mediada: la puesta en escena.
La enseñanza de procedimientos en el laboratorio de ciencias de formación docente
Authors: Umpiérrez Oroño Silvia , Cafferata María Teresa
Published: March 2018

Este trabajo presenta una investigación cuyos objetivos fueron conocer qué tipos de procedimientos enseñan los profesores de formación docente en el laboratorio de ciencias; cómo los enseñan y qué elementos modelan sus intenciones y acciones. Fue una investigación de carácter cualitativo, en la que intentamos la comprensión e interpretación de buenas prácticas de enseñanza. El análisis de los datos, propuesto como la construcción de una escultura, permitió generar categorías desde tres dimensiones: El escenario de la escultura, considera los factores externos que modelan la enseñanza de procedimientos en el laboratorio, produciendo dos categorías; La inspiración del escultor, mira las concepciones de los profesores, originando cuatro categorías y La obra final: esclavos emuladores y patrones supervisados interpreta cómo se enseñaron distintos procedimientos, generando dos categorías. Finalmente reflexionamos sobre repercusiones que podría tener la Teoría de Sistemas en la enseñanza de procedimientos y en la investigación educativa.
El reto de la visibilidad
Authors: Cossia Lautaro
Published: March 2018

La nueva aparición de InMediaciones de la Comunicación nos sigue planteando desafíos.
Preferment: A New Meaning in Retirement
Authors: Disch Joanne
Published: March 2018

This article reviews key trends affecting societal views on aging, examines data on RN retirement, and explores the many opportunities that are open to nurses who are approaching retirement. It describes a new way to think about this phase— preferment— along with strategies for preparing for preferment.
Assessing Evidence-Informed Practices to Reduce Routine Interventions in Labor and Childbirth: Validating the Content of the Keeping Birth Normal Tool
Authors: Darling Florence , Collington Valentina
Published: March 2018

Background:

The overuse of interventions in labor and childbirth increase the risk of mortality and morbidity in women. There are wide variations in the use of routine interventions locally, regionally, and globally. The reasons for this are complex and multifactorial. This study focuses its investigations at the microcosm of practice. It outlines the validation of the content of a new Tool to assess and support the implementation of evidence-informed practices by health-care professionals.

Methods:

Seven experts and eight women user representatives used a 4-point ordinal scale of relevance to rate 50 items in the Keeping Birth Normal (KBN) Tool. Item-level content validity index (I-CVI), an average scale-level content validity index (S-CVI/Ave), and qualitative comments were used to delete and improve items.

Results:

Eleven experts analyzed all 50 items. Four experts rated 35–49 items. The initial scale received an S-CVI/Ave of 0.88. Two items were deleted, improvements were made to 45 items, some were merged, and 7 new items were added. The final scale with 36 items received an S-CVI/Ave of 1.0 post item deletion and improvement.

Discussion:

The items in the KBN Tool are construct relevant and will undergo plausibility testing in a future study. Other forms of validity evidence on response processes and internal structure, which may be gathered, will depend on its further application in practice and research.
Domperidone Versus Metoclopramide: Self-Reported Side Effects in a Large Sample of Breastfeeding Mothers Who Used These Medications to Increase Milk Production
Authors: Hale Thomas W. , Kendall-Tackett Kathleen , Cong Zhen
Published: March 2018

Introduction: Metoclopramide and domperidone are medications that block dopamine receptors on the lactotrophs, allowing prolactin levels to rise. Both medications are prescribed to boost milk production in mothers with low milk production due to hypoprolactinemia. The Food and Drug Administration has not approved the use of domperidone in the U.S. because of concerns about increased risk of cardiac arrhythmias. Metoclopramide is often recommended instead. Unfortunately, metoclopramide affects the central nervous system (CNS) and increases the risk of both depression and tardive dyskinesia (TD).

Method: The present study is an online survey of self-reported side effects of 1,990 mothers, representing 25 countries, who took metoclopramide, domperidone, or both medications to enhance milk production. Data were collected in 2010.

Results: The results indicated that side effects, in general, affected only a small percentage of women who took either medication. Women were 3.6 times more likely to report no side effects when taking domperidone vs. metoclopramide. There were no significant differences in cardiac arrhythmias for women who took metoclopramide versus domperidone. Racing heart was more common with metoclopramide. Less than 1% reported these symptoms in both groups. However, CNS effects were significantly more common in women who took metoclopramide. Risk of depression increased by seven times, and symptoms of TD (tremors, involuntary grimaces, and jerking) increased by 4 to 19 times when women took metoclopramide.

Discussion: The results of the present study are preliminary, but suggest that cardiac arrhythmias are a rare side effect with both medications. The CNS side effects with metoclopramide are more concerning, particularly depression and TD. It is hoped that the recommendations regarding the relative safety of these medications will be re-examined in light of these findings.
Stock Option Grants And Cost Behavior
Authors: Kwon Dae-Hyun
Published: March 2018

This study examines the relation between cost asymmetry and stock option grants. I posit that managers’ incentives to decrease the strike price of subsequent option awards may affect manager’s resource adjustment decisions. Using U.S. firm data, I find that the degree of SG&A (selling, general, and administrative) cost asymmetry is positively related to the value of subsequent option grants awarded to the CEOs, suggesting that managers who expect large stock-option grants deliberately delay reduction of committed costs to decrease the share price prior to the option award date. Manipulating the timing of stock option grants do not fully explain the results because the positive relation that this paper documents still holds with only fixed-date option awards sample.
The Impact Of Political Instability Driven By The Tunisian Revolution On Stock Market Volatility: Evidence From Sectorial Indices
Authors: Zaiane Salma
Published: March 2018

The aim of this paper is to study the impact of political uncertainty, driven by the Tunisian Revolution, on return and volatility of major sectorial stock indices in the Tunisian Stock Exchange. We specifically use EGARCH (1.1) model from 01/12/2010 to 31/08/2016. This model is applied to the daily returns relevant to ten sectorial stock indices and to the Tunisian benchmark index (TUNINDEX). To test the impact of political news on returns and volatility, we divided them into two groups (good and bad news).

Our results show that both of good and bad news have increased the volatility of major selected indices, including the TUNINDEX. However, the return of all indices are not affected by the political news. We then examined the impact of terrorism on the behavior of indices return and volatility. Results show that the Tunisian market responds significantly to terrorist acts. Hence, the return declines and the volatility increase the day of terrorist attacks. Furthermore, results confirm that bad news have stronger effect on the volatility than good news, which reveal the asymmetric effect of volatility.
SMEs' Use Of Financial Statements For Decision Making: Evidence From Pakistan
Authors: Akhtar Shamim , Liu Yanping
Published: March 2018

Financial statements comprise of insightful statistics about likely risk and the return associations of many decisions and have significant role in firms’ success, particularly for SMEs. Thus, through a sample of 94 Pakistani small and medium enterprises (SMEs), this study inspects the influences that could have impact on firms’ practice of the financial statements in making significant financial decisions. Principle component analysis finds key factors which define use of financial statements containing; experience, knowledge and ability. Logit analysis then discloses that these variables have significant association with whether Pakistani SME owners use financial statements while making business decisions. Findings indicates that the owners of Pakistani SMEs practice financial statements in decision making rendering to their knowledge about financial statements, experience and finally their ability to interpret figures confined in financial statements. Outcomes should be valuable for SME owners, educators, and the service providers.
KONSTRUK SOSIAL DALAM KONVERGENSI HISAB DAN RUKYAT
Authors: Sakirman Sakirman
Published: March 2018

Hisab and rukyat issues have confiscated the energies of Muslims so great, it makes ukhuwah sometimes disturbed even in the celebration of Eid and Eid al-Adha. For a long time we are transfixed and chained to the problem only but not on the solution. As if the problem is merely the difference of the method of reckoning (astronomical calculations) and rukyat (hilal observations) that are impossible to unite, it is equally impossible to unite different schools of thought. The debates of the strongest arguments between the proponents of hisab and rukyat have been going on for hundreds of years, but the result has deepened the gap. This paper is trying to discuss the two problems mentioned above, to focus more on the discussion, the issues to be discussed are the concept of hisab and rukyat, history of hisab and rukyat, the strength and weaknesses between hisab and rukyat, the matched concept of hisab rukyat in Indonesia.
PEMBELAJARAN KARAKTER BERBASIS NILAI-NILAI PESATREN (Studi atas Pondok Pesantren Al-Is’af Kalabaan, Guluk-guluk Sumenep)
Authors: Solichin Mohammad Muchlis
Published: March 2018

Pesantren as a traditional islamic education institution runs the education system supported by values as the students’ characters. Keeping values of pesantren exists through teaching learning can strenghthen the taughness of the pesantren in keeping its existence in the society. This research is trying to analyze the pesantren’s values which become the characteristics of the santri and this values is developed in the teaching learning process. This research uses qualitative research with observation, interview, and documentation as the data collection procedure. From the result of the research, it can be seen that the santri’s characteristic values  which are defended in the education process in al-Is.’af Islamic boarding school are sincerity,survavibility, simplicity, asketism, spirit to teach and do worship to ALLAH.
ANALISIS STRATEGI PEMERINTAH DALAM PENGELOLAAN SUMBER DAYA ALAM BATU BARA DI KABUPATEN TANAH LAUT BERBASIS MANAJEMEN STRATEGIK DALAM PERSPEKTIF EKONOMI SYARIAH
Authors: Purnomo Agus , Hasan Ibrahim
Published: March 2018

This research is motivated by the management of coal resources in Tanah Laut districts based on strategic management in the islamic economic perspective. The purpose of this study is to identify, examine, and find new perspectives in research analysis of government strategies in the management of coal resources 2016 based on strategic management in the economi perspective of islam.Research method used in this research is kind of mixed research. In this study researchers used quantitative data to determine the potential of minerals, coal production per year, and so on. The qualitative method in this study is intended to describe the constraints or impacts of natural resource management in Tanah Laut regency districts to know which strategies to use, it is explored through observation, interview, and documentation.Through this research, it is known that, based on the results of interviews to the energy and mineral resources department, the government’s strategy is to utilize the human resources of quality and professional and the use of modern technology to utilize resoursces and reserves of their coal.
INTERNALISASI KONSEP MASLAHAH MELALUI BUKU SAKU DALAM MENGUATKAN KARAKTER ISLAMI SISWA DI MTs NEGERI SUMBER BUNGUR PAMEKASAN
Authors: Wardi Moch Cholid
Published: March 2018

This writing is trying to analyze the effort of strengthening and internalizing the students’ Islamic characteristics through their pocket book. Based on the research data, MTsN Sumber Bungur pamekasan did a concrete way to strengthen the students’ Islamic characteristics by integrating them in every aspect of the lesson. Besides, there is also an effort to internalize the maslahah concept in the application of students’ rule that can be seen from violation clarification and also the punishment which categorized into serious, medium, and small violation. The application of violation clarification and punishment category given is a concept of Maslahah and practical guidance. In the context of maslahah, serious, medium, small violation can be suited into dharurah, hajiyah and tahsiniyah.  The concept of strengthening the students’ Islamic characteristics through the students’ pocket book in MTsN Sumber Bungur Pamekasan has done by giving punishment in the form of giving point from 0- 100 by giving violation clarification to serious, medium and small violation. The internalization of Maslahah concept through the students pocket book in order to strengthen the students’ Islamic characteristics in MTsN Sumber Bungur Pamekasan is the application of Maslahah Dharuriyah, Maslahah Hajiyah and Maslahah Tahsiniyah which in practice it belongs to serious, medium, and small violation which oriented on the effort to bring goodness, peaceful, comfortable situation appropriate with the Sharia.
Effectiveness of Beauveria bassiana Powder as Larvacide to Aedes aegypti Linnaeus, 1762 Larvae
Authors: Hariani Nova , Wulandari Eka , Dharma Bodhi
Published: March 2018

Study of effectiveness of Beauveria bassiana Powder as Larvacide to Aedes aegypti larvae was conducted on September 2016 to May 2017 in Ecologi and Systematics Animal Laboratory, Faculty of Mathematics and Natural Sciences, University of Mulawarman. This study aimed to determine the effect of Beauveria bassiana powder with use flour rice media on differents concentration as larvacide to mortality of larvae Aedes aegypti. Stages of study include arranged experimental design (Completely Randomized Design) with concentration of 0%, 0.125%, 0.25%. 0.5% and 0.75%, taking sample, rearing third instar larvae of Aedes aegypti and application Beauveria bassiana powder in 48 hours observation. The mortality value of larvae willbe presented on percentage tabel and graph. The result showed, this product is capable of killing larvae for 48 hours with the percentage mortality 0%, 10%, 28%, 70% and 80% in each concentration. Mortality of larvae is influenced by concentration and period of exposure. Increased of product concentration that given and period of exposure can effected increased of mortality percentage.

Keywords: mortality, Beauveria bassiana powder, Aedes aegypti larvae
Effect of Silica Composition from Rice Husk Ash on The Performace of Absorbing Electromagnetic Wave on Composite of Unsaturated Polyester Resins/Silica
Authors: Fauzy Rizky , Adi Wisnu Ari , Taryana Yana , Yusmaniar Y.
Published: March 2018

This study aim is to know the effect of silica composition on the absorption of electromagnetic waves in the composite of unsaturated polyester resins (UPR)/silica. Silica raw materials have been synthesized from the results of rice husk ash extraction. The results of the analysis phase and elementary respective using X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) show that the extraction of silica has an amorphous phase with a high purity. This silica powders are filler material acts as an electromagnetic waves absorber material and combined with the UPR as a matrix to form a composite. Silica powder varied with several compositions in this composite. The observation of scanning electron microscope (SEM) shows that the silica particles have been distributed evenly in the UPR matrix. Meanwhile the results of testing the absorption of electromagnetic waves at frequency range of 8 GHz - 12 GHz using a vector network analyzer (VNA) show that the addition of silica composition have significant effect on the absorption of electromagnetic waves. The more the silica content in the UPR matrix causes the absorption of electromagnetic waves more increasing. It was concluded that the presence of silica can improve the absorption performance of electromagnetic waves in composite UPR/silica.

Keywords: rice husk ash, silica, UPR, composites, electromagnetic wave absorber
Verbal and Mathematical Thinking: Comparative Analysis of Some Issues
Authors: Begz Chuluundorj
Published: March 2018

This paper presents how mathematical ideas can be used to go deeply into the study of verbal cognition. Researchers in human psychology do not have an answer to the question on similarity in mechanisms of mathematical and verbal reasoning in human. The arithmetic reasoning captures deeply important properties of the world which human brain represents also in verbal cognition.Analysis of the properties of verbal thinking in comparation with mathematical cognition is an important topic in applied linguistics and cognitive psychology.
Effect of Potassium Chlorate on the Treatment of Domestic Sewage by Achieving Shortcut Nitrification in Constructed Rapid Infiltration System
Authors: Fang Qinglin , Xu Wenlai , Yan Zhijiao , Qian Lei
Published: March 2018

Constructed rapid infiltration system (CRI) is a new type of sewage biofilm treatment technology, but due to its anaerobic zone lacks of the carbon sources and the condition for nitrate retention, its nitrogen removal perfomance is very poor; However, shortcut nitrification-denitrification process presents distinctive advantages, as it saves oxygen, requires less organic matter and needs less time for denitrification compared to conventional nitrogen removal method. Thus, if the shortcut nitrification-denitrification process could be applied to CRI system properly, the simpler, more economic and efficient nitrogen removal method will be obtained. But, as its reaction process shows that the first and the most important step of achieving shortcut nitrification-denitrification is to achieve shortcut nitrification. Thus, in this study, we explored the feasibility to achieve shortcut nitrification, which produces nitrite as the dominant nitrogen species in effluent, by addition of potassium chlorate (KClO3) to the influent. In an experimental CRI model system, the effects on nitrogen removal, nitrate inhibition and nitrite accumulation were studied, and the advantages of achieving shortcut nitrification-denitrification were also analysed. The results showed that shortcut nitrification was successfully achieved and maintained in a CRI system by adding 5 mM KClO3 to the influent at a constant pH of 8.4. Under these conditions nitrite accumulation rate was increased, while a lower concentration of 3 mM KClO3 had no obvious effect. The addition of 5 mM KClO3 in influent presumably allowed sufficient activity of ammonia-oxidizing bacteria (AOB) but inhibited nitrite-oxidizing bacteria (NOB) strongly enough to result in a maximum nitrite accumulation rate of up to over 80%. As a result, nitrite became the dominant nitrogen product in the effluent. Moreover, if the shortcut denitrification will be achieved in the subsequent research, it could save 60.27 mg carbon source (CH3OH) consumption when treatment of per liter sewage in CRI system compared with full denitrification process.
Analysis of Junior High School Students’ Problem-solving Ability Reviewed from Self-regulated Learning
Authors: Bayuningsih A S , Usodo B , Subanti S
Published: March 2018

Problem-solving ability in mathematics is a primary means to understand a problem and develop the students ' ability in solving a problem. Step in solving problems are categorized to understanding the problem, devising a plan, carrying out the plan and reflection. This research used a descriptive method aimed to identify the problem-solving ability among junior high school students and review from students self-regulated learning (SRL).The subjects of the research were taken by one student in each SRL category (high, medium, and low) which then given the problem-solving test and the result was triangulated by interview. Based on the research, it can be stated that the students with high self-regulation can solve a mathematical problem by applying first indicator, the second indicator, third indicator, but they cannot apply the fourth indicator. The students with medium self-regulation can apply the first indicator and second indicator while they are still having the problem in third indicator and fourth indicator. The students with low category self-regulation cannot apply all of those in solving the mathematical problem.
Stimulating Students’ Argumentation using Drawing – based Modeling on The Concept of Ecosystem
Authors: Sumarni E N , Widodo A , Solihat R
Published: March 2018

Drawing – based modeling as learning approach, it allows students to create models based on drawing which help them to run a simulation. Students can use drawing–based modeling to learn a pair of interacting population known as predato–prey system while they usually conducted practicum using diagram of organisms. This study was to explore students’ argumentation and students’ understanding on the concept of the ecosystem. The study was conducted quasi – experimental using the matching – only post-test – only control group design. The participants consist of 60 grade 10 senior high school students in Subang, West Java. They are placed into two groups, 30 students in the experimental group and 30 students in the control group. Data was collected through argumentation test and selected response test for assessing students’ understanding. Students’ argumentation were analyzed using Toulmin’s argumentation pattern and statistical analysis. The result showed there is no significant difference between the experimental group and the control group for students’ argumentation. Most of the students are predominantly at level 2. But the coherency of arguments of the experimental group is more coherent than the control group. It means that the students in experimental group can make logical claim and supported by the correct and relevant grounds (data, warrant, and backing). The result of students’ understanding showed there is a significant mean score between the experimental group and the control group whether 72.33 for the experimental group and 62.13 for the control group
Effectiveness of Jigsaw-Flash Learning Model in Geometry Material
Authors: Pakhrurrozi Imam , Sujadi Imam , Pramudya Ikrar
Published: March 2018

This study aims to determine and describe the effectiveness of the use of jigsaw-flash learning model on geometry material. The jigsaw-flash learning model is a jigsaw learning model which is modified with adobe flash media. The research method used is mix method research with exploratory sequential strategy. This research was conducted in state junior high schools in Surakarta. Subjects in this study were the students of class VIII namely class VIII-2 as an experimental class and class VIII-3 as a control class selected by random sampling technique. The experimental class was taught with a jigsaw-flash learning model and the control class was taught with a jigsaw model. The procedures performed in this study include qualitative data collection and data analysis followed by quantitative data collection and data analysis. The researcher used interview method for collecting qualitative data. While quantitative data collection was conducted by test and the analysis technique used was t-test. The results of this study indicate that students feel more comfortable and interested in studying geometry material taught by jigsaw-flash model. In addition, students taught using the jigsaw-flash model are more active and motivated than the students who were taught using jigsaw models in studying geometric material. This shows that the use of the jigsaw-flash model can increase student participation and motivation. The results of this study also indicate that the increase in student achievement taught by the jigsaw-flash model which is indicated by t-test result t = 2,259 with df = 38. Based on the results, it can be concluded that jigsaw-flash model is more effective than jigsaw model. Therefore, teachers need to consider the use of jigsaw-flash learning model in learning geometry material.
Students’ Learning Obstacles and Alternative Solution in Counting Rules Learning Levels Senior High School
Authors: Jatmiko M A , Herman T , Dahlan J A
Published: March 2018

The counting rules is a topic in mathematics senior high school. In the learning process, teachers often find students who have difficulties in learning this topic. Knowing the characteristics of students' learning difficulties and analyzing the causes is important for the teacher, as an effort in trying to reflect the learning process and as a reference in constructing alternative learning solutions which appropriate to anticipate students’ learning obstacles. This study uses qualitative methods and involves 70 students of class XII as research subjects. The data collection techniques used in this study is diagnostic test instrument about learning difficulties in counting rules, observation, and interview. The data used to know the learning difficulties experienced by students, the causes of learning difficulties, and to develop alternative learning solutions. From the results of data analysis, the results of diagnostic tests researcher found some obstacles faced by students, such as students get confused in describing the definition, students difficulties in understanding the procedure of solving multiplication rules. Based on those problems, researcher analyzed the causes of these difficulties and make hypothetical learning trajectory as an alternative solution in counting rules learning.
Teaching Creative Thinking Skills with Laboratory Work
Authors: Khoiri Nur , Riyadi Slamet , Kaltsum Ummi , Hindarto Nathan , Rusilawati Ani
Published: March 2018

Research on figuring out the ways to teach creative thinking skills via learning processes has been carried out. One of the methods applied to be efficient to teach creative thinking skills is laboratory work. Laboratory work is an important process in learning physics since students tend to find it hard to understand physical concepts if they are only taught verbally. Students will understand better when they are given real life examples and are allowed to learn the concepts through the laboratory work, whenever possible. The research was conducted at SMAN 1 Bringin by employing the quasi-experiment pre-test - post-test control group design. Creative thinking skills were measured based on four indicators: flexibility, fluency, originality, and detail. Results show that laboratory work was suitable to improve students’ fluent thinking ability with 77% students showing improvement, and it was also a fit to improve students’ original thinking with 84% students showing improvement. The experiment class revealed a gain of 0.51, taken from an average pre-test score of 45.64 compared to the average post-test score of 73.5, which is an increase of 27.86. Meanwhile, the control class resulted in a gain of 0.40, taken from an average pre-test score of 39.11 compared to the average post-test score of 83.44, which is an increase of 24.33.
The development of student worksheet assisted by interactive multimedia of photoelectric effect to build science process skills
Authors: Payudi Payudi , Ertikanto Chandra , Fadiawati Noor , Suyatna Agus
Published: March 2018

This research aims to produce student worksheet based on interactive multimedia on photoelectric effect to grow science process skills that are attractive, easy, useful, and study to improve students learning out comes. The development design used in this research by Sugiono which implemented in 8 stages, they are potential and problem, data collecting, product design, validation design, revision design, product trial, product, and trial usage. Trial usage of the product was conducted at SMA Negeri 2 Bandar Lampung in October 2016 to November 2016 and the research subject was twelve grade classes. The sampling technique of product trial subjects done by purpose sampling, it took two same classes. One class used as an experimental class and the other class as a control class. Trial product design used Matching-Only Pretest-Post test Control Group Design method. Data collecting technique used questionnaire and test (pretest and post test). The data were analyzed by using a descriptive quantitative method. The conclusions of the research are: (1) Student worksheet to build scientific process skills on photoelectric effect should include predicting and hypothesizing activities, planning the experiment, doing the practicum, interpreting the observation, and communicating. (2) Student worksheet of development result has an attractiveness level with the average score is 3.27 or 81.74% with “interesting” category, ease level with the average score is 3.25 or 81.32 with “simple”, and usefulness level with the average score is 3.21 or 80.13% of “useful” category. (3) Student worksheet of development result is effective to improve students learning outcomes in science process skills with N-gain average is 0.63 with the medium.
Profile of Visual-Spatial Intelligence In Solving Geometric of 11th Grades Viewed From Gender Differences
Authors: Rimbatmojo Sigit , Kusmayadi Tri Atmojo , Riyadi Riyadi
Published: March 2018

Visual-spatial intelligence is one of the multiple bits of intelligence that important to solve a mathematics problem, especially in geometry. This present research investigates the profile of students’ visual-spatial intelligence. This research focuses on analysis and description of students’ visual-spatial intelligence level generally and its aspect when solving the geometric problem. Visual-spatial intelligence aspect, there is imagination, pattern seeking, problem-solving, and conceptualization. Qualitative research with case study strategy was used in this research. The subject in this research involved 12 students of 11th grades chosen with purposive sampling. Data in this research were students’ visual-spatial intelligence test result and task based interviews. They were asked to complete visual-spatial intelligence test before interview. The data was analyzed based on visual-spatial intelligence aspect of female and male students. The results of this research show that female students have better pattern seeking and conceptualization. Meanwhile, male students have better in imagination and problem-solving.
Unceratainty of Heisenberg in Universe Destruction
Authors: Jumini Sri
Published: March 2018

The Qur'an is a guidence which explaines all about the universe to human being. The discovery of science has been able to explain the truth of the Qur'an scientifically. One of which is the principle of Heisenberg's uncertainty in the event of the universe destruction. The purpose of this research is to know: 1) Science's view of the event of the universe destruction (Big Crunch) in Qur’an [Al Infithaar]: 1-3, and How the relation of Heisenberg’s uncertainty principles and the law of thermodynamics II toward  the collapse of the universe (Big Crunch) based on Scientific views and the Quran. This research is a qualitative research using library research method which analyzes the related books directly or indirectly. The results of the analysis stated that: 1) The concentration of mass, which is big enough, relates to some of the laws of physics, those are: Relativity, Heisenberg's uncertainty principles, and the law of Thermodynamic II; 2) The universe will return at its sole point, i.e; the absence of the universe; 3) The destruction of the universe is the destruction of the order of the universe which then the stars fall scatteredly because of the gravitational force that prevents them disappears, the balance of the universe diminishes, decreases and becomes uncertain, and eventually disappears.
Understanding students' concepts through guided inquiry learning and free modified inquiry on static fluid material
Authors: Sularso Sularso , Sunarno Widha , Sarwanto Sarwanto
Published: March 2018

This study provides information on understanding students' concepts in guided inquiry learning groups and in free modified inquiry learning groups. Understanding of student concept is reviewed on the concept of static fluid case. The number of samples tested were 67 students. The sample is divided into 2 groups of students: the group is given guided inquiry learning and the group given the modified free inquiry learning. Understanding the concept of students is measured through 23 tests of items about the concept of static fluid. The result of the students 'understanding of the guide inquiry learning is better than the students' understanding of the concept of free modified inquiry learning.
Virtual Lab Experiment: Physics Educational Technology (PhET)Photo Electric Effect for Senior High School
Authors: Supurwoko Supurwoko , Cari C , Sarwanto Sarwanto , Sukarmin Sukarmin , Budiharti Rini , Dewi Tiarasita Summa
Published: March 2018

This paper introduced these Physics Educational Technology (PhET) Simulation and demonstrated their utility for Senior High School Students. The PhET simulations are very involved, interactive animated environments that create a unique opportunity for students. In each case, we demonstrate that discussion simulations are more productive, for developing student conceptual understanding  for photo electric effect than traditional discussion without simulations. During the discussion with PhET simulation, students can construct their  understanding about concepts photo electric effect within this framework. Students learn by building on their prior understanding through a series of constrained and supportives exploration. The simulations support an interactive approach and constrain students productively.