bluuebunny/crossref_metadata_2025 huggingface dataset:
A comparative study on the dielectric and multiferroic properties of Co0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 composite ceramics
Authors: Qin Xiaofeng , Xu Ruicheng , Wu Heng , Rongli Gao , Wang Zhenhua , Chen Gang , Fu Chunlin , Deng Xiaoling , Cai Wei
Published: January 2020

Co0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 (CZFO/BST) composite ceramics with different
molar ratios (1:3, 1:2, 1:1, 2:1 and 3:1) were prepared by combining
chemical co-precipitation and sol-gel method. Effects of molar ratio on the
microstructure, dielectric and multiferroic properties were investigated.
The formation of the individual phases and the composites was confirmed by
XRD results and small amount of secondary phase (Ba2Fe2Ti4O13) was observed.
The grain sizes of magnetic (CZFO) and ferroelectric phase (BST), measured
by SEM, were about 5 ?m and 0.5 ?m, respectively. The sample with molar
ratio (1:2) has the largest dielectric constant, while the sample with molar
ratio (3:1) shows the lowest dielectric constant. A distinct loss peak can
be observed for all the samples. Both the peak position and peak intensity
increase with the frequency, indicating relaxation polarization process
generated by space charge or interface polarization. The ceramics with molar
ratio (1:1) shows the smallest leakage current (~ 10?7 A/cm at 1.5 kV/cm),
while the leakage current (~ 10?5 A/cm at 1.5 kV/cm) of the sample with
molar ratio (3:1) is the largest. The ferroelectric hysteresis loop is not
apparent due to the low Curie temperature of the ferroelectric phase, but
the sample with molar ratio (2:1) shows the best ferroelectric properties.
It was found that with the increase of CZFO content, the values of
saturation (Ms) and remnant (Mr) magnetization increase at first and then
decrease. The sample with molar ratio (3:1) has the maximum Ms value (about
50.34 emu/g), while the sample with molar ratio (1:2) shows the minimal Mr
value (about 0.46 emu/g). This anomalous magnetic property is induced by the
interface interaction between the two phases.
Primary-school-age population change in the Federation of Bosnia and Herzegovina: The effects of demographic factors
Authors: Kadusic Alma , Smajic Nedima
Published: January 2020

The beginning of the 21st century in the Federation of Bosnia and Herzegovina
(henceforth referred to as ?the Federation?) has been characterised by a
decrease in the primary-school-age population. As such, the main objective of
this work is to define and explain the factors that have influenced the
decrease in the primary-school-age population in this part of Bosnia and
Herzegovina. The research methodology applied in this work is oriented
towards defining the degree of influence of demographic factors on the
development of the primary-school-age population in the Federation. By using
statistical methods and GIS analysis of statistical data, negative
demographic trends were confirmed in the Federation at the end of the 20th
and the beginning of the 21st century. These trends included intensive
migration, a decrease in the total number of inhabitants, a decrease in the
birth rate, an increased mortality rate, a decreased rate of natural
population change, and the ageing of the population. Due to adverse economic,
social, political, and other circumstances after 1995, population emigration
has been intensified, most noticeably within the population aged between 20
and 40. The most important result of the research is the fact that the
decrease in the natural population dynamics and intensive emigration are the
most significant factors influencing the decrease in the primary-school-age
population in the Federation. Such negative demographic trends influence the
primary education system adversely. In the future, it will be necessary to
plan and implement a population-revitalisation process as part of the
federation?s overall population policy.
Some notes on the pedagogical value of historical pathological science examples from Chemistry and Physics, and related sciences
Authors: Rodrigues Sérgio Paulo Jorge
Published: January 2020

ResumoOs dados biográficos sobre cientistas, e em particular de químicos e físicos, podem ser usados como elemento motivador dos estudantes e público assim como um instrumento humanizador da ciência e demonstrativo da forma como esta funciona na prática. A dimensão humana da ciência emerge naturalmente da análise de apontamentos biográficos que enfatizem os dilemas e os sucessos e fracassos dos cientistas. Os episódios históricos e as atitudes e acções dos cientistas mostram como funciona a ciência e dão aos estudantes e público a possibilidade de reflectirem sobre a ciência e a sua humanidade, assim como de desenvolverem a capacidade de desconfiar do anacronismo, da pseudo-ciência, da ciência patológica e da fraude científica, para melhor apreciarem e entenderem o desenvolvimento da ciência. Começando com uma breve revisão dos sintomas e critérios propostos na literatura para distinguir desvios anormais, neste trabalho são analisados alguns casos de produção de ciência patológica nos campos da química e da física, procurando, a partir destes, evidenciar caminhos pedagógicos que fomentem o espírito crítico dos estudantes e do público. Palavras-chave: Biografias de cientistas, estratégias pedagógicas, humanidade da ciência, pseudo-ciência, ciência patológica. Abstract Biographical data about scientists, and in particular about chemists and physicists, can be used for engaging students and the public, humanizing the science image, and for demonstrating how it works in the practice. The human dimension of science emerges naturally from the analysis of biographical aspects that emphasize the dilemmas and the successes and failures of scientists. The historical episodes and the attitudes and actions of scientists show how science works and offer students and public the opportunity to reflect about science and its humanity, as well as to develop the capacity to distrust anachronism, pseudo-science, pathological science, and scientific fraud in order to better appreciate and understand the action and development of science. Starting with a brief review of the symptoms and criteria proposed in the literature to distinguish deviations from normal science, this work analyzes some cases of production of pathological science, focusing on chemistry and physics, seeking pedagogical paths that foster the critical spirit of students and the public.Keywords: Biographies of scientists, pedagogical strategies, the humanity of science, pseudo-science, pathological science.
O que é a estética?
Authors: Haubert Laura Elizia
Published: January 2020

Tradução do artigo: SANTAYANA, George. What is Aesthetic? In: The Philosophical Review, vol. 13, n. 3, p.320-327, 1904.
A história do melhoramento animal
Authors: Martins Ângela , Santos Virgínia , Silvestre Mário
Published: January 2020

ResumoA história do melhoramento genético animal acompanha a história da Humanidade, começando com a domesticação do primeiro animal, que terá sido o cão, ao qual se seguiram os bovinos, ovinos e todas as outras espécies que deram origem às raças domésticas da atualidade. Inicialmente a seleção de reprodutores era efetuada de forma empírica. No século XVIII R. Bakewell foi pioneiro na utilização de registos produtivos e testes de descendência. No final deste século começaram a ser estabelecidos os livros genealógicos de diversas raças. No século XIX, os avanços científicos protagonizados por C. Darwin e G. Mendel são fundamentais para que, na primeira metade do século XX se desenvolva a maior parte da teoria do melhoramento animal, com o contributo de vários investigadores (R. Fisher, S. Wright, J. Haldane). Jay Lush ficou conhecido como o pai do melhoramento animal moderno. Defendeu que em vez da aparência subjetiva, o melhoramento animal deve-se basear em conhecimentos da genética quantitativa e da estatística. Charles Henderson apresentou o método Best Linear Unbiased Prediction (BLUP) para a estimativa do valor genético aditivo e sugeriu a integração da genealogia completa da população para incluir as relações genéticas entre os indivíduos. A evolução dos computadores permitiu a implementação generalizada do BLUP no final da década de 1980. Nos últimos tempos T. Meuwissen e M. Goddard desenvolveram a forma de incorporar informação do ADN em grande escala no modelo animal para estimar os valores genómicos. Palavras-chave: genética, melhoramento animal Abstract The history of animal breeding follows the history of humanity, beginning with the domestication of the first animal, which was the dog, followed by the cattle, sheep and all other species that gave rise to the domestic breed of the present time. Initially the selection of breeders was carried out empirically. In the eighteenth century R. Bakewell pioneered the use of records of performance of animals and progeny testing. At the end of this century herdbooks of various breeds began to be established. In the 19th century, the scientific advances made by Darwin and Mendel are fundamental for the, in the first half of the 20th century, development of most animal breeding theory with the contribution of several researchers (R. Fisher, S. Wright, J. Haldane). Jay Lush became known as the father of modern animal breeding. He argued that instead of subjective appearance, animal breeding should be bas
Breve história da toxicologia vegetal: alguns usos das plantas tóxicas ao longo do tempo
Authors: Perpétuo Natacha Catarina , Campos Maria da Graça , Trincão Paulo Renato , Coutinho António Pereira
Published: January 2020

ResumoEste trabalho pretende fazer uma breve análise da história da toxicologia e dos usos que as plantas tóxicas e os seus venenos foram tendo ao longo da história da humanidade, nomeadamente na Antiguidade. As possibilidades de utilização das plantas são praticamente ilimitadas. Assim, pode afirmar-se que a sua importância para o ser humano é inquestionável. O Homem recorre a elas desde a Pré-História, não só pelo seu valor nutricional e terapêutico, mas atribuindo-lhes, também, significados religiosos, estéticos, poéticos e morais. As práticas médicas ancestrais usavam as plantas com fins curativos, podendo considerar-se a fitoterapia como a forma de tratamento mais antiga. Esta prática manteve-se até ao final do séc. XIX/início do séc. XX, quando se isolaram as primeiras substâncias químicas bioactivas das plantas medicinais de origem (ex.: aspirina, digitalina, morfina).À semelhança das suas propriedades medicinais, também o conhecimento e uso dos venenos das plantas remonta à Antiguidade, tendo sido utilizados com diversos propósitos (ex.: caça, pesca, guerra, suicídio, homicídio).O conhecimento da história da toxicologia tem interesse no âmbito de várias disciplinas das áreas das ciências naturais e da saúde, como a medicina, a farmácia, a biologia, a bioquímica, as ciências forenses, entre outras.Palavras-chave: Envenenamentos; Plantas tóxicas; Venenos.AbstractThis work intends to make a brief analysis of the history of toxicology and the uses that toxic plants and their poisons have had throughout the history of mankind, namely in the Antiquity.The possibilities for plant use are practically unlimited. Thus, we can affirm that its importance to the human being is unquestionable. Man uses them since the Prehistory, not only for their nutritional and therapeutic value, but also attributing them religious, aesthetic, poetic and moral meanings. Ancient medical practices used plants for healing purposes, and phytotherapy may be considered as the oldest form of treatment. This practice continued until the end of the 19th century/early 20th century, when the first bioactive chemicals were isolated from the medicinal plants of origin (e.g. aspirin, digitalin, morphine). Like its medicinal properties, the knowledge and use of plant poisons can be traced back to Antiquity, and have been used for various purposes (e.g. hunting, fishing, war, suicide, homicide). Knowledge of the history of toxicology is of interest in various disciplines in the fields of natural sciences and health, such as medicine, pharmacy, biology, biochemistry, forensic sciences, among others.Keywords: Poisoning; Toxic plants; Poisons.
História da ciência, práticas discursivas e comunicação didática: uma breve reflexão
Authors: Belo José M.C.
Published: January 2020

Resumo De que falamos quando pretendemos falar da história da ciência no ensino? Falamos do ensino da(s) ciência(s)? Falamos do ensino da história da ciência? Falamos de ambos? Se falamos do ensino de história da ciência, então poderíamos falar de todas as disciplinas (unidades curriculares) que constituem o currículo porque, de algum modo, a ciência – a sua história – é transversal a todas. Por outro lado, se falamos da história da ciência como adjuvante do ensino das ciências - do lugar que a história da ciência deve ocupar no quadro do ensino das ciências - então estaremos a falar de algo bem diferente que tem merecidamente ocupado muitos dos que se preocupam com estas questões. Pela nossa parte, na necessariamente breve reflexão que vamos efetuar, tentaremos pôr em relevo, por um lado, a importância do conhecimento do desenvolvimento histórico da atividade científica como elemento agregador e motivador para todos os estudantes de ciências, ao mesmo tempo que evidenciaremos o modo como o discurso didático está carregado de elementos causadores de ruído no processo de comunicação didática. Palavras-chave: história da ciência; comunicação didática; paradigmas Abstract What do we talk about when we want to talk about the history of science in education? Are we talking about science(s) teaching? Are we talking about the teaching of the history of science? Are we talking about both? If we talk about the teaching of the history of science, then we could speak of all the disciplines (curricular units) that constitute the curriculum because, in some way, science - its history - is transversal to all of them. On the other hand, if we speak of the history of science as an adjunct to science teaching - the place that history of science must occupy in science teaching - then we are talking about something quite different that has deservedly occupied many of those who care about these issues. On our part, in the necessarily brief reflection that we are going to make, we will try to highlight, on the one hand, the importance of the knowledge of the historical development of scientific activity as an aggregator and motivator for all students of science, and, at the same time, we will try to show the way as the didactic discourse is loaded with elements that cause noise in the process of didactic communication. Keywords: history of science; didactic communication; paradigms
História do Ensino de Histologia
Authors: Calado Ana Margarida
Published: January 2020

Resumo O termo "histologia" surgiu pela primeira vez em 1819 num livro do autor anatomista e fisiologista alemão Karl Meyer, com a sua origem nos estudos microscópicos de estruturas biológicas descritas pelo médico italiano Marcello Malpighi no século XVII. A histologia é a ciência que estuda a organização dos tecidos do corpo e é uma componente fundamental da educação em medicina. Desde o seu início no século XVIII, a histologia progrediu de mãos dadas com os avanços na área da microscopia, das tecnologias microscópicas, incluindo a preparação de amostras biológicas, colorações e imunohistoquímica. Desde a formulação da teoria celular em 1839, as universidades de medicina iniciaram o ensino desta ciência em estreita conexão com a fisiologia. Em Estrasburgo, entre 1846 e 1871, foi desenvolvida e organizada uma escola de histofisiologia. O microscópio e o estudo dos tecidos foram considerados como uma abordagem fundamental para o progresso do conhecimento biológico e médico desde o século XIX até hoje. Atualmente, o uso de microscopia virtual é uma realidade aceite e muitas vezes integrada no ensino de histologia. Em comparação com os métodos tradicionais, a utilização do microscópio virtual nos novos curricula permite que as instituições de ensino em medicina lecionem o mesmo conteúdo programático poupando material, recursos e tempo. Palavras-chave: histologia; microscópio; ciência; ensino Abstract The term "histology" first appeared in a book of 1819 written by the German anatomist and physiologist Karl Meyer, tracing its origins to the microscopic studies of biological structures of the seventeenth century by the Italian physician Marcello Malpighi. Histology is the science that provides the adequate learning of the tissue organization of the body, and is a fundamental part of medical education. Since its beginning in the 18th century, the discipline of histology has progressed hand in hand with the advancements in microscopy and microscopic technologies, including techniques for the preparation of biological samples, staining and immunohistochemistry. Since cell theory was formulated in 1839, medical universities have given rise to the teaching of this science in close connection with physiology. Between 1846 and 1871 a histophysiological school was organized in Strasbourg. The microscope and the study of tissues were considered as a fundamental approach for the progress of biological and medical knowledge from the nineteenth century to the present day. Nowadays, the use of virtual microscopy is now an accepted and often integral part of teaching histology. Compared with traditional methods, the use of the virtual microscope in the new curricula allows medical institutions to teach the same programmatic content sparing material, resources and time. Keywords: histology; microscopy; science; teaching
Gramática: ensino da disciplina metalinguística na cultura ocidental brasileira
Authors: Noccioli Carlos Alexandre Molina , Carvas Giovanna Maria Abrantes
Published: January 2020

Resumo Este artigo é parte de um estudo histórico e comparativo acerca do ensino de língua padrão enquanto ciência linguística, inserido na tradição ocidental do fazer gramática. Discorremos a partir de um resgate da história em torno da disciplina gramatical desde a Antiguidade Clássica, a fim de estabelecermos pontos de contato com uma gramática brasileira situada no pós-NGB (Nomenclatura Gramatical Brasileira), especialmente o livro Sintaxe clássica portuguêsa de Cláudio Brandão.Palavras-chave: História, Ensino de gramática, perduração ideológica Abstract This article is part of a historical and comparative study of standard language teaching as a linguistic science, embedded in the Western tradition of grammar making. We draw from a rescue of history around grammar discipline since Classical Antiquity, in order to establish points of contact with a Brazilian grammar located in the post-NGB (Brazilian Grammatical Nomenclature), especially the Cláudio Brandão’ book Sintaxe clássica portuguêsa. Keywords: History, Grammar teaching, ideological perduring
O conceito de derivada: uma análise através dos programas curriculares do século XX
Authors: Aires Ana Paula Florêncio
Published: January 2020

ResumoNesta comunicação pretendemos analisar, guiados pelo filão histórico e tendo como intervalo temporal o séc. XX, a importância e evolução do conceito de derivada, desde a sua introdução, em 1905, nos programas oficiais de Matemática do 3.o Ciclo do Ensino Liceal, atualmente designado de Ensino Secundário. Temos como cenário um período marcado por significativas mudanças de regime político, que tiveram repercussões muito efetivas no ensino em geral, e no ensino da matemática em particular. Este estudo permitiu-nos concluir que a evolução do conceito de derivada nos programas curriculares de Matemática não foi linear, antes pelo contrário, verificamos progressos e retrocessos, indecisões e dúvidas, muito fruto das várias reformas de ensino que ocorreram durante o séc. XX. Palavras-chave: Derivada, Matemática, Ensino secundário, Programas curriculares. Abstract In this communication we intend to analyze, guided by the historical lode and having as time interval the 20 th century, the importance and evolution of the concept of derivative, since its introduction in 1905, in the official programs of Mathematics of high school, currently designated as secondary education. We have as scenario a period marked by significant changes of political regime, which had very effective repercussions in the teaching in general, and in the teaching of mathematics in particular. This study allowed us to conclude that the evolution of the concept of derivative in the official Mathematics programs was not linear, but on the contrary, we verified progress and setbacks, indecisions and doubts, much fruit of the various educational reforms that occurred during the 20th century.Keywords: Derivative, Mathematics, Secondary education, Curricular programs.
Partículas alfa como projéteis subatômicos: os trabalhos de Hans Geiger
Authors: Marques Deividi Marcio
Published: January 2020

ResumoOs trabalhos para desvendar a estrutura da matéria no começo do século passado fizeram com que vários cientistas elaborassem diferentes experimentos de modo a permitir o entendimento e o arranjo atômico em diferentes metais. Um dos físicos que merece destaque foi Johannes Wilhelm Geiger (1882­1945), também conhecido como Hans Geiger, que desenvolveu uma maneira de estudar a estrutura dos metais utilizando partículas alfa provenientes de compostos de rádio. A técnica consistia em bombardear finas folhas de diferentes metais com partículas alfa e analisar seus desvios. Essa técnica possibilitou que, futuramente, fosse possível a elaboração de outro experimento que constatou, entre outros aspectos, o núcleo atômico. Será́ apresentado, portanto, neste artigo a tradução comentada do artigo On the Scattering of the α–Particles by Matter.Palavras-chave: Partícula alfa; espalhamento de partículas; Hans GeigerAbstractThe work to unravel the structure of matter at the beginning of the last century led several scientists to design different experiments to allow understanding and arrangement atomic metals. One of the prominent physicists was Johannes Wilhelm Geiger (18821945), also known as Hans Geiger, who developed a way to study the structure of metals using alpha particles from radio compounds. The technique consisted of bombarding thin sheets of different metals with alpha particles and analyzing their deviations. This technique made it possible, in the future, to develop another experiment that found, among other aspects, the atomic nucleus. Therefore, it will be presented in this paper how Hans Geiger elaborated his experiments, highlighting their results and difficulties. In addition, the importance of this historical episode in Basic Education will be discussed.Keywords: Alpha particles; scattering particle; Hans Geiger
Transposição matricial de conflitos. Um contributo para a história da ciência no ensino
Authors: Antunes Carlos Fortes , Correia José Alberto , Vaz Henrique
Published: January 2020

Resumo A alternância dicotómica da história da ciência entre o género individual e o social tem dificultado a sua implementação no ensino. O conjunto de informações empíricas recolhidas num processo de investigação, ainda em curso, efetuado através de grupos de discussão focalizada e com base na conjugação da fenomenologia com a teoria fundamentada nos dados, permitiram identificar dinâmicas de conflitos em diferentes fases das transições, envolvendo a escola e o mundo do trabalho, de 66 indivíduos na região do Porto. A reinterpretação da informação empírica levou-nos a colocar o processo de desenvolvimento da história da ciência, lado a lado com o processo da mediação dos conflitos. A mediação transposta de conflitos que geraram o desenvolvimento do conhecimento pode contribuir para a implementação da história da ciência no ensino. Palavras-chave: mediação; conflito; matriz espaço-tempo; história Abstract Dichotomous switching of the history of science between the individual and the social gender have hampered its implementation in teaching. The set of empirical information collected in the process of investigation, still under way, conducted through focus groups and based on combination of phenomenology with grounded theory, enabled us to identify conflict dynamics at different stages of transitions, involving the school and the world of work, of 66 individuals in the region of Porto. The reinterpretation of the empirical information led us to place the development process of the history of science, alongside the process of mediation of conflicts. The transposed mediation of conflicts that generated the development of knowledge can contribute to the implementation of the history of science in teaching. Keywords: mediation; conflict; space-time matrix; history
ANÁLISE DOS FATORES QUE INFLUENCIAM A ARRECADAÇÃO DO REGIME GERAL EM PAÍSES DO CONTINENTE AMERICANO
Authors: Pinto Larissa Marie Martins , Peixoto Aline Gomes , Ferreira Jander Angelo Diogo , Guimarães Aline Nascimento
Published: January 2020

As reformas realizadas nos países americanos almejam encontrar um modelo previdenciário que seja ideal para seu desenvolvimento. Essa pesquisa teve como objetivo identificar os fatores que influenciam a arrecadação previdenciária em países americanos, com análise no ano de 2016. Na revisão de literatura, identificou-se variáveis que podem influenciar na arrecadação previdenciária. Com os dados obtidos por regressão linear simples, pode-se verificar que as variações positivas na arrecadação previdenciária ocorrem nos índices econômicos PIB per capita e salários, e as variações negativas estão associadas aos índices trabalho informal, taxa de desemprego, taxa de inatividade, taxa de inflação e juros. No resultado, percebeu-se que a taxa de inflação é o índice com maior impacto na arrecadação dos países da amostra.
IDENTIFIKASI BAWAH PERMUKAAN LAPANGAN MINYAK“HUF” SUMATERA SELATAN UNTUK MENDELINIASI STRUKTUR CEKUNGAN HIDROKARBON BERDASARKAN DATA GAYABERAT
Authors: Setiawan Ade , Mulyatno Bagus Sapto
Published: January 2020

Oil field research in regional Banyuasin “HUF” , South Sumatra have been done by the gravity data with objective of knowing fault structure based on analysis of hydrocarbon SVD and knows hollow structure  based on the 3D model of the Bouguer Anomaly and Residual Anomaly. Study areas had Bouguer Anomaly between 13 mgal up to 33 mgal to the interval 1 mgal, where the value of Bouguer Anomaly high have a range value 26 mgal up to 33 mgal which is in the direction of west. While the low value of Bouguer Anomaly have a range value 13 mgal to 20 mgal that is in the east. To knew the existence of structure fault, filtering Second Vertical Derivative (SVD) on a Bouguer Anomaly, Regional and Residua mapl.Pattern of structure fault indicated the contours of a zero value and between the high and low contours. From the results of the analysis SVD Complete Bouguer Anomaly and SVD Residual Anomaly there were 4 (four) fault, while from SVD Regional Anomaly there are 3 (three) fault. 3D modeling the Residual Anomaly were conducted to prove the existence of the fault SVD analyzed based on the results of the analysis and to know the hydrocarbon basin. Based on the results of the inversion of 3D the Residual Anomaly, basin was found in the depth of 1500 m – 3000 m with a value of the density ranges from 2.24 gram/cc until 2.32 gram/cc which identified as sandstone basin.
PEMODELAN DAN ANALISA STRUKTUR BAWAH PERMUKAAN DAERAH PROSPEK PANASBUMI KEPAHIANG BERDASARKAN METODE GAYABERAT
Authors: Sihombing Roy Bryanson , Rustadi Rustadi
Published: January 2020

Research has been conducted in Kepahiang area using gravity data with the aim of identify faults based on analysis of the Second Vertical Derivative (SVD) and interpreting structure sub-surface of the based on 3D inverse modelling from Bouguer anomaly and residual anomaly. The research area have an Bouguer anomaly between 38 mGal - 74 mGal, where the high Bouguer anomaly value has a value range of 63,2 mGal - 74 mGal located in the southwest direction of the research area. Whereas the low Bouguer anomaly value has a range of values 38 mGal - 47 mGal located in the north of the research area. To know the existence of fault structure in research area, conducted filtering Second Vertical Derivative (SVD) on the map Bouguer anomaly, regional and residual. The structure faulting is shown with contour of zero and between the contours of high and low. From the analysis of SVD complete anomaly Bouguer and SVD residual anomaly there are 8 (eight) faulting, while from SVD regional anomaly there are 4 (four) fault. 3D inversion modeling of the residual anomaly was done to prove the existence of the fault analyzed based on filtering Second Vertical Derivative (SVD). Based on the results of inversion 3D residual anomaly been gained one (1) reservoir in a northern direction research area and two (2) in the direction of west the research area by a contrast the density of -0,0719356 gr/cc until -0,236053 gr/cc with a depth of 0 meters up to 4.705 meters.
Front Cover JGE Vol 4 No 2 2018
Authors: JGE Editor
Published: January 2020

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INVERSI 2D DATA MAGNETOTELURIK UNTUK MENGETAHUI KEBERADAAN HIDROKARBON DAERAH BULA, MALUKU
Authors: Limswipin Elen Novia , Rasimeng Syamsurijal , Karyanto Karyanto , Indragiri Noor Muhammad
Published: January 2020

There had been done a regional research which tittle is “2D inversion magnetotelluric data for understanding the hidrocarbon presence in Bula, Maluku”. This study aims to determine the resistivity distribution area of research based on data Magnetotelluric, identifying the presence of hydrocarbons based on the value of the resistivity of the results of 2D inversion of data Magnetotelluric. Methods of data processing done are (i) transform raw data from the time domain into the frequency domain, (ii) reduce noise by robust processing, (iii) process combine, (iv) Selection cross power, (v) inversion 1D and 2D. 2D inversion results is sectional subsurface resistivity distribution, layer having resistivity values 7-16 Ωm along MT1 and MT7 point at a depth of 1000 meters is a clay stone which is indicated as cap rock. Layer with resistivity values 34-120 Ωm, which is between the point MT6 and MT7 at a depth of 1500 meters is indicated as the sandstone reservoir. Based on geologic information and sectional 2D inversion seen their fault based on the resistivity contrast is between the point MT2 and MT3, MT3 and MT4 and MT6 and MT7.
STUDI SIFAT TERMAL BATUAN DAERAH LAPANGAN PANAS BUMI WAY RATAI BERDASARKAN PENGUKURAN METODE KONDUKTIVITAS TERMAL
Authors: Donovan Ryan , Karyanto Karyanto , Dewanto Ordas
Published: January 2020

Research on Way Ratai geothermal field has been done by measuring the thermal conductivity method. The thermal conductivity data is used to generate a map of the dispersion of heat conductively conductive rocks in the geothermal system. The result of measurement by thermal conductivity method in Way Ratai geothermal field is data of k (conductivity), Rt (thermal resistivity), and T (temperature). The value of the measured conductivity data in the geothermal field has range between 0.056-0.664 W/mK, the measured thermal resistivity value has range between 1.344-17.527mK/W, and the measured temperature value is between 22.68-52.59°C. The difference value of rock’s thermal conductivity is influenced by several factors, which is the existing geological structures in the field such as normal faults and lineaments, the presence of alteration, also the manifestation zone of hot water or hot vapor that caused from fumaroles.
Analisis Penurunan Muka Tanah dengan Small Baseline Subset Differential SAR Interferograms di Kota Bandar Lampung
Authors: Setyadi Bagas , Rustadi Rustadi
Published: January 2020

Bandar Lampung is one of the cities in Indonesia, which has a potential to land subsidence due to the extraction of ground water, mining, land conversion, and geological conditions. For that reason, carried out the study of land subsidence with SBAS technique, due to the very lack of information about the symptoms of land subsidence in Bandar Lampung. In this study, 15 SAR data in 2006 to 2011 used and then combined to produce 40 interferogram then inverted resulting in a time-series deformation and deformation speed average. Velocity precision obtained with SBAS technique is highly dependent on the type of land cover in the study area, but it is known that the average of land subsidence in Bandar Lampung is about 0.06 mm/year, which is considered quite stable due to the geological structure that does not allow for the occurrence of massive consolidation process. Several areas have indications of subsidence 5 mm/year are suspected to be caused by tectonic activity and human activity (industrial, mining, extraction of groundwater, and land conversion), which then has implications for structural damage to buildings, flooding in coastal areas, and landslides in hilly areas.
ESTIMASI SEBARAN HIDROKARBON DENGAN MENGGUNAKAN INDIKATOR P-WAVE DIFFERENCE DISPERSION FACTOR PADA LAPANGAN BONAPARTE
Authors: Erlangga Mokhammad Puput , Handoyo Handoyo , Wijaksono Egie
Published: January 2020

In the hydrocarbon  exploration, we need the method that result the direct hydrocarbon indicator to estimate the reservoir location and dimension accurately. It is a difficult and long standing problem. The method that used before was inverting the linearized of Zoepprit’s equation. But this method would not result the physical property depend on frequency. We know that the seismic wave propagate in the porous and fluid saturated media will attenuate and wave dispersion. This phenomenon is caused by the dissipation of seismic energy that depend on frequency. So by this idea, we will use the frequency-dependent of physical property to improve the accuracy of direct hydrocarbon indicator. The physical property will be used here is the P-Wave velocity. The method is call the P-Wave Difference Dispersion Factor (PPDF).
PROPUESTA DE DECLARACIÓN DEL ESPECTRO ELECTROMAGNÉTICO PARA ECUADOR
Authors: Herrera Myrian , Porras Luis , Estrella Carlos
Published: January 2020

El presente trabajo muestra el estado del arte respecto de los diferentes límites asignados a cada rango del espectro electromagnético por distintos autores y organismos internacionales, y busca a través de esta revisión establecer una única “Propuesta de declaración del espectro electromagnético para Ecuador”, que claramente identifique estos límites y aporte a la universalización de criterios y lenguaje, comparación de resultados interinstitucionales e internacionales de forma clara y precisa, y sirva como aporte para identificar de manera objetiva las secciones no atendidas del espectro, para la adecuada planificación, uso y, gestión de este recurso, por parte de los diferentes actores e instituciones públicas y principalmente en atención a los ejes de Seguridad y Defensa Nacional.
ANALISIS KINERJA SAHAM SEBAGAI DAMPAK DARI DETERMINASI NON PERFORMING LOAN TERHADAP PROFITABILITAS
Authors: Munawar Andri Helmi , Maulana Yogi Sugiarto
Published: January 2020

Fundamental performance of the banking sector which is proxied by CAMEL analysis is an indicator that is able to assess the level of soundness of a company that has an impact on the potential performance of a company's stock portfolio. This article wants to reveal how companies can understand how to improve company performance and improve performance on company performance. The sample in this study uses purposive sampling, secondary data on financial statements of PT Bank Negara Indonesia (Persero) Tbk with a study period of 2007-2017, research using quantitative methods with explanatory methods, analysis techniques using path analysis. The results of this study indicate that non-performing loans have a significant effect on return on assets, but partially both the effects of non-performing loans and return on assets are not significant on stock prices. The existence of mediation variables in this study does not become a significant influence on changes in stock prices, meaning that there is no significant non-performing loan effect on stock prices with return on assets as an intervening variable.. Kinerja fundamental sektor perbankan yang diproksikan dengan analisis CAMEL merupakan indikator yang mampu menilai tingkat kesehatan suatu perusahaan yang tentunya ber-impact terhadap kinerja potofolio saham perusahaan. Penelitian ini ingin mengungkap bagaimana perusahaan dapat mengetahui dampak kinerja fundamental salah satu aktiva produktif yang berisiko (non performing loan) terhadap profitabilitas bank dan dampaknya pada performance saham perusahaan. Sampel pada penelitian ini menggunakan purposive sampling, data sekunder laporan keuangan PT Bank Negara Indonesia (Persero) Tbk dengan periode waktu penelitian 2007-2017, pendekatan penelitian menggunakan kuantitatif dengan metode eksplanatori, teknik analisis menggunakan analisis jalur. Hasil penelitian ini menunjukkan non performing loan memiliki pengaruh signifikan terhadap return on asset, namun secara parsial baik pengaruh non performing loan dan return on asset tidak signifikan terhadap harga saham. Keberadaan variabel mediasi dalam penelitian ini tidak menjadi pengaruh berarti terhadap perubahan harga saham, artinya tidak terdapat pengaruh signifikan non performing loan terhadap harga saham dengan return on asset sebagai variabel intervening.
ANALISIS KREDIT USAHA RAKYAT PADA BANK RAKYAT INDONESIA
Authors: . Suryanto
Published: January 2020

This study aims to analyze the procedure for granting people's business credit (KUR) to Bank Rakyat Indonesia (BRI). The research method used in this study is a qualitative method with a type of descriptive research. The data obtained in this study uses research instruments, namely through observation, in-depth interviews, and documentation studies. Interviews were conducted with the Micro and Small Director of Bank BRI, debtor representatives and prospective debtors, as well as Bank Indonesia Representative Credit Section Bandung. Data collected from several sources carried out credibility testing with data triangulation — data analysis techniques used with data reduction, data presentation, and conclusions. The results of the study indicate that the implementation of the provision of people's business loans to Bank BRI through several stages, namely the stages of credit administration, credit documentation, credit approval, credit processing. The level of Non-Performing Loans (NPL) of BRI KUR shows a fairly large number of 2.31%, but among other KUR executing banks BRI's NPL is the smallest. The high level of NPL is because there are several factors, including: (1) wrong perceptions among Micro, Small and Medium Enterprises (MSME) actors regarding the source of funds in KUR distribution; (2) changes in the character of the debtor; and (3) the account officer section conducts a subjective analysis because there are certain relationships with prospective debtors Penelitian ini bertujuan untuk menganalisis prosedur pemberian kredit usaha rakyat (KUR) pada Bank Rakyat Indonesia (BRI). Metode penelitian yang digunakan dalam penelitian ini adalah metode kualitatif dengan jenis penelitian deskriptif. Data yang diperoleh pada penelitian ini menggunakan instrumen penelitian yaitu melalui observasi, wawancara mendalam dan studi dokumentasi. Wawancara dilakukan dengan Direktur Mikro dan Kecil Bank BRI, perwakilan debitur dan calon debitur, serta Bagian kredit Bank Indonesia Perwakilan Bandung. Data yang terkumpul dari beberapa sumber dilakukan pengujian kredibilitas dengan triangulasi data. Teknik analisis data yang digunakan dengan reduksi data, penyajian data, dan kesimpulan. Hasil penelitian menunjukkan bahwa pelaksanaan pemberian kredit usaha rakyat pada Bank BRI melalui beberapa tahapan yaitu tahap credit administration, credit documentation, credit approval, credit processing. Tingkat Non Performing Loan (NPL) KUR BRI memperlihatkan angka yang cukup besar yaitu 2,31%, tetapi diantara bank pelaksana KUR yang lainnya NPL Bank BRI yang paling kecil. Tingginya tingkat NPL dikarenakan adalah ada beberapa faktor, antara lain: (1) persepsi yang salah dikalangan pelaku Usaha Mikro Kecil dan Menengah (UMKM) mengenai sumber dana dalam penyaluran KUR; (2) adanya perubahan karakter debitur; dan (3)  bagian account officer melakukan analisis secara subjektif karena ada hubungan tertentu dengan calon debitur.
Impact of LMXSC on organizational commitment and deviant behavior
Authors: Son EunYul , Choi MyoungOk , Park DongGun
Published: January 2020

The purpose of this present study was to investigate the influence of LMXSC(Leader-Member exchange social comparison) on organizational commitment and deviant behavior in workplace. It was also tested whether perceived leader status moderates the relationship between LMXSC and organizational commitment and deviant behavior. Data were collected from 306 employees who were working in various organizations. The results showed that (a) LMXSC was positively related to the organizational commitment, (b) perceived leader status moderated the relationship between LMXSC and organizational commitment. The relationship between LMXSC and deviant behavior was, however, not significant. Moderating effect of perceived leader status on relationship between LMXSC and deviant behavior was not significant, either. Based on these results, implications of these findings, limitations and future study directions were discussed.
PERSEPSI PETANI TERHADAP BUDIDAYA GANDUM TROPIS
Authors: Pramuditya M. Alfian Happy , Prihtanti Tinjung Mary
Published: January 2020

Indonesia tried to cultivated wheat since 2000. Characteristics of Indonesia as a tropical country caused the productivity of wheat crops was relatively lower than the productivity of sub-tropical wheat cultivation. The development of wheat cultivation was carried out in various regions, including in Central Java Province. Several institutions had participated to introduce the wheat cultivation in Central Java province. This study explores the farmer perceptions on wheat farming and correlation between internal driver and external driver and farmer's perception on wheat farming, and the correlation between farmer perception toward farmer motivation to cultivate wheat. This research used survey technique to collect primary data from farmers who get involved on wheat cultivation introduction program. Data analysis techniques were used rank spearman correlation analysis. The study showed that respondents in Demak Regency tend to have the perception that wheat cultivation is very unprofitable, not easily cultivated and has a high risk of crop failure. Respondents in Boyolali tend to have the perception that wheat is easily cultivated, but has a high risk of crop failure and high selling prices. Respondents in Klaten Regency tend to have the perception that wheat cultivation is not profitable and has a high risk of crop failure, but has a high selling price. There is no significant relationship on age, education, farming experience, frequency of extension, and farm environmental conditions on farmers' perceptions. There are significant relationship between farmer status, land area, with farmers’ perception on wheat cultivation, and the farmers perception had relation with farmers motivation to cultivate wheat
THE IMPACT OF PEER ASSESSMENT ON STUDENTS’ RECOUNT TEXT
Authors: Indasari Nur Laili , Purwati Oikurema , Anam Syafiul
Published: January 2020

Peer Assessment is one of the alternative methods to enhance the students’ motivation and ability in writing. Providing feedback is the goal of peer assessment. It is not an easy task as it is required an ability to deliver the feedback critically and competence to master the knowledge of writing. Therefore, the present study is going to explore the impact of giving feedback in the peer assessment process on students’ recount text and to acknowledge the students’ challenges while giving and receiving feedback in that process. Qualitative study assisted the researcher to get the data. The university students in the second semester became the subjects of the study. Documents and interviews were techniques to collect the data. The results revealed that the students’ first draft and the last draft of recount text got improvements mainly on the aspect of grammar. Meanwhile, most students’ challenges while giving and receiving feedback in the process of peer assessment were the aspect of psychology and the knowledge of grammar. In conclusion, the process of peer assessment which involves giving and receiving feedback provides a positive impact on the students’ recount text and the challenges which are faced by the students can be used as inputs for the lecturer in teaching.
Influence of Honking on the Road Traffic Noise Generated at Urban Rotaries for Heterogeneous Traffic
Authors: Aditya Kamineni , Chowdary Venkaiah
Published: January 2020

This paper presents a study conducted at major rotaries for quantifying the traffic noise levels by considering the vehicle volume and their respective honking as governing parameters for heterogeneous traffic. Traffic volume and traffic noise data was collected using a digital video camera and a class 1 sound level meter, respectively. The traffic noise data was analysed using noise tools for identifying the noise level variation. The data collected was subjected to statistical analysis for light, medium and heavy vehicles, and their contribution towards noise levels is proven to be effective with the forthright fact that, heavy vehicles and their corresponding honking were majorly affecting the equivalent noise level compared to other vehicular proportion. An equivalent noise level [LAeq (dB)] rise of 2 to 6 dB (A) is solely caused by heavy vehicles, which is an important observation to be considered for traffic noise analysis at the rotaries. Based on the obtained results from one of the rotaries, noise prediction model is developed for estimating the LAeq (dB), which is able to predict the noise levels with good precision when validated with the data collected at second rotary intersection for different vehicle volumes.
On the identity and phylogenetic position of Dero indica (Clitellata: Naididae)
Authors: Srinivasan Sivabalan , Martinsson Svante , Naveed Mohammed Ibrahim
Published: January 2020

The identity and validity of the freshwater worm Dero indica (Clitellata: Naididae; Naidinae) has been debated, and it has been suggested that it is likely to be identical with D. digitata. In this study we combine a newly generated COI sequence of D. indica with available sequences from GenBank, to estimate the phylogeny of Dero using both Bayesian Inference and Maximum Likelihood. The trees show that D. indica is well separated from D. digitata, instead it is closest to D. vaga, but with low support. Furthermore, the analyses confirm the close relationship between Dero and Branchiodrilus found in previous studies, and indicates the presence of cryptic species in D. furcata and D. digitata.