bluuebunny/crossref_metadata_2025 huggingface dataset:
AN EARLY PREDICTION AND DIAGNOSIS OF SEPSIS IN INTENSIVE CARE UNITS: AN UNSUPERVİSED MACHINE LEARNING MODEL
Authors: SİLAHTAROĞLU Gökhan , CANBOLAT Zehra Nur
Published: April 2020

Sepsis infection, which is one of the most important causes of death in intensive care units, is seen as a severe global health crisis. If an early diagnosis of sepsis infection cannot be made, and treatment is not started rapidly, septic shock may result in multiple organ failure and death is almost inevitable. Therefore, it is vital to establish an early diagnosis and start the treatment at once. This study aims to accomplish a new model of unsupervised machine learning using lactate and Ph laboratory test values, which are considered to be important parameters to diagnose sepsis infection. The data used in the study have been obtained from MIMIC-III international clinical database. Unsupervised machine learning has been performed via the Fuzzy-C algorithm along with validity indexes like Xie Beni on patients’ data diagnosed sepsis and non-sepsis. The machine-generated ten labels at the end of the training session considering-designed validity indexes. The labelled cluster representatives have been reduced to two dimensions by Principal Component Analysis method in order to monitor the learning in a two-dimensional space. The study contributes to the literature by conducting unsupervised learning through two parameters (Lactate and Ph) and leading to multi-parameter studies. In addition, the study reports that there are five types of sepsis patterns in terms of Lactate and PH laboratory tests.
On contractive mappings and discontinuity at fixed points
Authors: Garai Hiranmoy , Dey Lakshmi , Cho Yeol
Published: April 2020

This paper deals with an interesting open problem of B.E. Rhoades (Contemporary Math. (Amer. Math. Soc.) 72(1988), 233-245) on the existence of general contractive conditions which have fixed points, but are not necessarily continuous at the fixed points. We propose some more solutions to this problem by introducing two new types of contractive mappings, that is, A-contractive and A`-contractive, which are, in some sense, more appropriate than those of the important previous attempts. We establish some new fixed point results involving these two contractive mappings in compact metric spaces and also in complete metric spaces and show that these contractive mappings are not necessarily continuous at their fixed points. Finally, we suggest an applicable area, where our main results may be employed.
Blocking sets for cycles and paths designs
Authors: Bonacini Paola , Marino Lucia
Published: April 2020

In this paper, we study blocking sets for C4, P3 and P5-designs. In the case of C4-designs and P3-designs we determine the cases in which the blocking sets have the largest possible range of cardinalities. These designs are called largely blocked. Moreover, a blocking set T for a G-design is called perfect if in any block the number of edges between elements of T and elements in the complement is equal to a constant. In this paper, we consider perfect blocking sets for C4-designs and P5-designs.
Some sharp circular and hyperbolic bounds of exp(-x2) with applications
Authors: Bagul Yogesh , Chesneau Christophe
Published: April 2020

This article is devoted to the determination of sharp lower and upper bounds
for exp(-x2) over the interval (-?,?). The bounds are of the type [a+f(x)/a+1]? , where f(x) denotes either cosine or hyperbolic cosine. The
results are then used to obtain and refine some known Cusa-Huygens type
inequalities. In particular, a new simple proof of Cusa-Huygens type
inequalities is presented as an application. For other interesting
applications of the main results, sharp bounds of the truncated Gaussian
sine integral and error functions are established. They can be useful in
probability theory.
Discrete universality of the Riemann zeta-function in short intervals
Authors: Laurincikas Antanas
Published: April 2020

We consider the approximation of analytic functions by shifts of the Riemann
zeta-function ?(s+ikh) with fixed h > 0 when positive integers k run over
the interval [N,N+M], where N1/3(logN)26=15 ? M ? N, and prove that those k
have a positive lower density as N ? ?. The same is true for some
compositions. Two types of h > 0 are discussed separately.
Full Hermite interpolation of the reliability of a hammock network
Authors: Dăuş Leonard , Jianu Marilena
Published: April 2020

Although the hammock networks were introduced more than sixty years ago, there is no general formula of the associated reliability polynomial. Using the full Hermite interpolation polynomial, we propose an approximation for the reliability polynomial of a hammock network of arbitrary size. In the second part of the paper, we provide combinatorial formulas for the first two non-zero coefficients of the reliability polynomial.
Answers to three conjectures on convexity of three functions involving complete elliptic integrals of the first kind
Authors: Wang Miao-Kun , Chu Hong-Hu , Li Yong-Min , Chu Yu-Ming
Published: April 2020

In the article, we prove that the function x ? (1-x)pK(?x) is
logarithmically concave on (0,1) if and only if p ? 7/32, the function x ?
K(?x)/log(1+4/?1-x) is convex on (0,1) and the function x ? d2/dx2 [K(?x)- log (1+4/?1-x) is absolutely monotonic on (0,1),
where K(x) = ??/20 (1-x2 sin2t)-1/2 dt (0 < x < 1) is the complete
elliptic integral of the first kind.
Hyperbolic metric on the strip and the Schwarz lemma for HQR mappings
Authors: Mateljevic Miodrag , Svetlik Marek
Published: April 2020

We give simple proofs of various versions of the Schwarz lemma for real valued harmonic functions and for holomorphic (more generally harmonic quasiregular, shortly HQR) mappings with the strip codomain. Along the way, we get a simple proof of a new version of the Schwarz lemma for real valued harmonic functions (without the assumption that 0 is mapped to 0 by the corresponding map). Using the Schwarz-Pick lemma related to distortion for harmonic functions and the elementary properties of the hyperbolic geometry of the strip we get optimal estimates for modulus of HQR mappings.
Assessment of enthesitis in patients with psoriasis: Relationships with clinical features, screening questionnaries results, and quality of life: An ultrasound study
Authors: Dulovic Dragan , Rancic Nemanja , Bozic Ksenija , Stamatovic Ratko , Mijuskovic Zeljko , Pesic Jasna , Kremic Zorana , Vojinovic Radisa , Petronijevic Milan
Published: April 2020

Background/Aim. Often asymptomatic, enthesitis can be an integral feature of the wide clinical spectrum in psoriasis as well as an early sign of development of psoriatic arthritis (PsA). It may be difficult to clinically recognize enthesitis in patients with psoriasis or distinguish it from other causes of extraarticular pain. Ultrasound (US) expanding use with the development of accurate assessments through standardized US algorithms as the Glasgow Ultrasound Enthesis Scoring System (GUESS) and the Madrid Sonographic Enthesitis Index Scoring System (MASEI) scores made the US the dominant imaging technique in diagnosing enthesitis. The aims of this study were to establish the prevalence of US signs of en-thesitis, compare it with screening questionnaires results, and estimate possible connections of US verified enthesitis with quality of life (QOL) of patients with psoriasis without PsA diagnosis. Methods. A cross-sectional study was performed on 67 patients with psoriasis who were without systemic therapy. The clinical presence of enthesitis was examined by an experienced rheumatologist, and systemic inflammation was estimated through serum level of C-reactive protein (CRP). The Psoriasis Area Severity Index (PASI) and Body Surface Area- Psoriasis (BSA-PsO) were calculated by a dermatologist. Visual analogue scale (VAS) for pain, screening questionnaires ? the Toronto Psoriatic Arthritis Screening (ToPAS), Psoriasis Ep-idemiology Screening Tool (PEST), Psoriatic Arthritis Screening and Evaluation (PASE), Early Psoriatic Arthritis Screening Questionnaire (EARP), and Psoriasis and Arthrosis Screening Questionnaire (PASQ) ? were filled by patients. GUESS and MASEI scores were determined by US. The QOL was estimated by the Dermatology Life Quality Index (DLQI). Results. The presence of clinical enthesitis was recorded in 8.7% of patients. According to US signs of enthesitis using GUESS and MASEI scores, only 7% and 2% of patients, respectively, had no sign of enthesitis. Duration of psoriasis and age of subjects were in a significant correlation with GUESS and MASEI scores, while systemic inflammation, V AS v alue, PASI, and BSA-PsO scores were not. GUESS and MASEI scores significantly correlated with scores of all screening questionnaires as well as with DLQI. Conclusion. US can detect subclinical enthesitis better than clinical examination and widely used screening questionnaires, even though the correlations between MASEI and/or GUESS scores and results of screening questionnaires were positive. US examination is important in the multidisciplinary approach in diagnosing and managing psoriasis.
A male case of dermatofibrosarcoma protuberans in the breast presenting as gynecomastia
Authors: Vucaj-Cirilovic Viktorija , Vukovic Milos , Boban Jasmina , Solajic Nenad , Ranisavljevic Milan , Prvulovic-Bunovic Natasa
Published: April 2020

Introduction. Dermatofibrosarcoma protuberans (DFSP) is a very rare mesenchymal tumor that accounts for approximately 0.1% of all malignancies. It is a locally aggressive fibrous tumor, with a high recurrence rate, which sometimes gives rise to distant metastases, usually to the bones and lungs. DFSP usually occurs on the trunk and extremities with only a small number of cases in the breast, especially in men. Case report. We presented a rare case of DFSP in the male breast. A 66-year-old man presented with gynecomastia of the left breast. The diagnostic work-up comprised of clinical examination, ultrasonography, core biopsy, and mammography. Immunohistochemistry revealed diffuse and strong positivity for vimentin, CD99, and CD34, while the tumor cells were completely negative for keratin, S100 protein, STAT6, CD31, and factor VIII, highly suggestive for DFSP. Subsequently, a radical mastectomy was performed and preoperative diagnosis of DESP was confirmed by pathological examination and immunohistochemistry. The patient was still disease-free six months after the surgical treatment. Conclusion. DFSP is a soft tissue sarcoma that rarely occurs in the breast, especially in men. The most common clinical presentation in the breast is a mass with extensive nodules on the surface, but it can also be presented as gynecomastia, as in our case. The diagnosis of DFPS is based on anatomopathology with immunohistochemistry analysis since there are no specific imaging features for this rare entity. Surgical excision with wide and negative margins is optimal for reducing the risk of recurrence.
Composite bioscore is superior to routine biomarkers and established scoring systems in predicting mortality in adult critically ill patients with secondary sepsis
Authors: Rondovic Goran , Surbatovic Maja , Djordjevic Dragan , Stanojevic Ivan , Zeba Snjezana , Udovicic Ivo , Djukic Snezana , Eric Stevan , Sarac Momir , Vojvodic Danilo
Published: April 2020

Background/Aim. Sepsis represents a significant global burden, with an estimated 48.9 million cases and 11.0 million sepsis-related deaths recently recorded worldwide. The aim of this observational study was to assess a prognostic value of some readily available routine biomarkers: presepsin, procalcitonin, C-reactive protein (CRP), white blood cell (WBC) count, platelet count, mean platelet volume (MPV), and lactate, as well as their combination regarding the outcome in a cohort of critically ill adult patients with secondary sepsis. Methods. A total of 86 critically ill patients with secondary sepsis due to peritonitis, pancreatitis, and severe trauma, admitted to the surgical intensive care unit, were enrolled in this prospective study. Blood samples for biomarker analysis were collected in three time points: on admission (the 1st day) and on the 3rd, and 5th day after admission. The Sequential Organ Failure Assessment (SOFA) score, the Simplified Acute Physiology Score (SAPS) II, and the Acute Physiology and Chronic Health Evaluation (APACHE) II score were calculated and recorded within the first 24 hours after admission (1st day). SOFA and SAPS II scores were recorded daily. The primary end-point was hospital mortality. Results. Values of each applied score were expectedly significantly higher in non-survivors in all time points. Regarding investigated parameters, only presepsin levels were significantly higher in non-survivors in all time points; MPV levels on the 3rd and 5th day; serum lactate levels on the 3rd day; CRP levels and WBC count on the 5th day. Clinical accuracy of parameters in predicting lethal outcomes was investigated in all time points. On the 1st day, apart from all three scores, only presepsin demonstrated statistically significant discriminative power regarding outcome (AUC of 0.670). Apart from SAPS II and SOFA score, on the 3rd day presepsin, MPV, and lactate (AUCs of 0.716, 0.667, and 0.642, respectively) and on the 5th day presepsin, MPV, CRP, and WBC count (AUCs of 0.790, 0.681, 0.643 and 0.654, respectively) were good predictors of the lethal outcome. Composite bioscore (presepsin, MVP, and lactate) on the 3rd day had the highest AUC of 0.820 in comparison with individual scores and parameters. The independent predictor of the lethal outcome on the 1st day was presepsin (p < 0.05) and on the 3rd day MPV (p < 0.01). Conclusion. Composite bioscore is superior to routine biomarkers and established scoring systems in predicting mortality in adult critically ill patients with secondary sepsis.
Mosaic Defects of AlN Buffer Layers in GaN/AlN/4H-SiC Epitaxial Structure
Authors: ATAŞER Tuğçe , DEMİR Durmuş , BILGILI Ahmet Kursat , ÖZTÜRK Mustafa , ÖZÇELİK Süleyman
Published: April 2020

Structural properties of AlN buffer layers, grown by Metal Organic Chemical Vapor Deposition (MOCVD) on 4H-SiC substrate with thicknesses of 61.34, 116.88, 129.46 and 131.50 nm, are investigated by High Resolution X-Ray Diffraction (HR-XRD) technique. Interfacial roughness of AlN buffer layer was determined by XRR technique. The interface roughness value of 131.50 nm thick sample is determined as 0.50 nm. Mosaic defects, tilt angle, vertical and lateral coherence lengths are characterized by HR-XRD technique. The edge and screw dislocations of the 131.50 nm thick sample are found as 2.98x1010 and 8.86x108 cm-2 respectively. The results indicate that 131.50 nm thick AlN buffer layer should be used in order to gain high performance in optoelectronic terms in this study. Thus, optimization of AlN buffer layer thickness is extremely important in device performance.
Estudio socioeducativo sobre la revisión de la salud mental en pacientes con diabetes mellitus tipo 2
Authors: Hernández Romo Valeria , Vásquez Martínez Claudio Rafael , Valdez Jiménez Liliana
Published: April 2020

La salud mental es parte significativa de la salud en general. Las personas que cuentan con un estado emocionalmente equilibrado tienen el control de sus pensamientos y comportamientos, y son capaces de enfrentar los desafíos que se presentan en su entorno cotidiano. Un paciente emocionalmente sano se puede recuperar de contratiempos, sentirse bien consigo mismo y tener una relación social armónica. La diabetes mellitus tipo 2 es una de las principales enfermedades crónico-degenerativas que deben ser atendidas en los centros de salud debido a las complicaciones físico-emocionales que genera en los pacientes. En México, se estima que existen aproximadamente 8.6 millones de diabéticos (Encuesta Nacional de Salud, 2018). El presente artículo aborda las diversas investigaciones y modelos teóricos que podrían favorecer el cuidado de la salud mental en los pacientes con diabetes mellitus tipo 2. El papel del psicólogo es acompañar a esas personas en el proceso de aceptación del diagnóstico, en el cambio de conductas saludables y en la adherencia al tratamiento formulado para que puedan mejorar su calidad de vida.
Erasmus+ Hareketliliklerine Katılan Öğrencilerin Yabancı Dil Başarılarının Çeşitli Değişkenler Açısından İncelenmesi
Authors: KULOĞLU Muhammet Esad
Published: April 2020

Küreselleşen dünyada bireylerin yabancı dil becerilerini geliştirmeleri, göz ardı edilemeyecek bir gerekliliktir. Bu gereklilik toplumları bu yönde adımlar atmaya itmiş, Erasmus+ hareketlilikleri de bunun bir sonucu olarak ortaya çıkmıştır. Başladığı günden bu yana pek çok insan, Avrupa değerlerini yaygınlaştırmak ve çok dilli eğitimi desteklemek amacıyla hayata geçirilen Erasmus+ programının sağladığı fırsatlardan faydalanmıştır. Bu çalışmada, Erasmus+ hareketliliklerinden faydalanan Karabük Üniversitesi öğrencilerinin yabancı dil başarılarının çeşitli değişkenler açısından incelenmesi amaçlanmıştır. Araştırmada nicel araştırma desenlerinden betimsel tarama yöntemi ve anket tekniği kullanılmıştır. Araştırmanın örneklemini 2008-2009 ve 2018-2019 akademik yılları arasında Karabük Üniversitesi’nden Erasmus+ hareketliliklerine katılan ve gönüllü olarak bu çalışmada yer alan 118 öğrenci oluşturmaktadır. Araştırmada kullanılan veriler araştırmacı tarafından hazırlana anket aracılığı ile çevrimiçi olarak toplanmış ve SPSS programı kullanılarak analiz edilmiştir. Araştırmadan elde edilen bulgulara göre Erasmus+ hareketliliklerine katılmanın öğrencilerin yabancı dil başarılarını olumlu yönde etkilediği sonucuna ulaşılmıştır. Ayrıca staj hareketliliğine katılan öğrencilerin yabancı dil başarılarının öğrenim hareketliliğine katılanlara göre daha yüksek olduğu sonucuna da ulaşılmıştır. Araştırmanın sonuçlarında yola çıkarak genel olarak bütün Erasmus+ hareketlilikleri, özellikle staj hareketliliği öğrenciler arasında yaygınlaştırılmak için teşvik edilebilir.
Sosyal Bilgiler Öğretmenlerinin Tarihi Kültürel Miras Eğitimine İlişkin Görüşleri (Denizli Şehri Örneği)
Authors: AZRAK Seher , YALÇINKAYA Elvan
Published: April 2020

Bu araştırmada, Denizli ilindeki sosyal bilgiler öğretmenlerinin tarihi kültürel miras eğitimi ile ilgili görüşleri ortaya konulmaya çalışılmıştır. Araştırmada olgu bilim deseni kullanılmış, 20 sosyal bilgiler öğretmeninin görüşleri alınmıştır. Veri toplama aracı olarak görüşme formu kullanılmıştır. Ortaya çıkan verilerin analizinde içerik analizi yöntemi kullanılmıştır. Araştırma sonucunda, öğretmenlerin tarihi kültürel miras eğitimine ilgili oldukları görülmüştür. Tarihi kültürel miras eğitiminde görsel materyal eksikliği en çok karşılaşılan sorun olmuş ve bu konu için de en çok tercih edilen teknik gezi gözlem olmuştur. Öğretmeler tarafından tarihi kültürel miras eğitiminin Türkçe dersinde de verilmesinin uygun olduğu belirtilmiştir. Ayrıca öğretmenlerin Denizli’deki tarihi kültürel miras ögelerine karşı ilgisiz olmadıkları görülmüştür.
Evil, Corruption, Manipulation and Abuse of Power in Shakespeare’s Macbeth
Authors: PANDA SANTANU
Published: April 2020

Abstract: The chief objective of this paper is to find out the features of Evil, Corruption, Manipulation and Abuse of power in Shakespeare’s Macbeth. Shakespeare is the leading and prominent dramatist of Elizabethan era. He is often regarded as England’s ‘national poet’ and the ‘Bard of Avon’. The full title of Macbeth is ‘the Tragedy of Macbeth’. This is a tragedy where hellhound becomes a hero. Shakespeare presents the psychological battle in Macbeth through soliloquy and aside. As a result Macbeth’s physical action are distinct from his mental actions. The source of Macbeth is Holinshed’s Chronicles. Shakespeare modified many facts of stories from the purpose of tragic effect. The play opens with the witches. The witches belong to natural calamity symbolically they are associated with the calamity in human nature. The witches implicitly mention two battles. They know that Macbeth will open the physical battle. But they also know that they will defeat Macbeth in physical battle. The witches are single in their purpose. They want to meet Macbeth to united strength of the evil sets as a contrast to the rebellion against Duncan. Macbeth killed Duncan to acquire the crown. To collect it he uses the tricks of corruption and Manipulation. He also misuses the power to maintain his kingdom. He killed Banquo and Macduff’s innocent wife and child. But he forgot that the crown for which he and his wife killed Duncan and several on and bring a tempest on their life it will be the cause of their destruction.
A reflexão sobre a prática e o discurso de professores: um estudo de caso
Authors: Kriill Ayrton , Ribeiro Rogério
Published: April 2020

Este artigo apresenta uma discussão acerca do discurso de professores que ensinam Matemática sobre a temática “professor reflexivo”. A investigação foi realizada com professores de diferentes níveis de ensino e que atuam no município de Guarulhos. Metodologicamente, esta pesquisa está alicerçada nos princípios do estudo de caso, e para a coleta de dados utilizamos diferentes instrumentos, como o uso de questionário e as entrevistas. As análises de nossos dados nos permitiram observar que os discursos dos professores participantes desta investigação convergem, em parte, com as discussões teóricas que adotamos para nossa análise. Os dados nos permitem inferir, também, que estes professores pouco se envolvem com as leituras e discussões que poderiam auxiliá-los, teoricamente, no processo de formação de um professor reflexivo.
Palavras-chave: Professor reflexivo. Discurso do professor. Reflexão sobre a prática.
Perspectiva foucaultiana dos discursos em uma aula de Matemática: densidade demográfica
Authors: Teixeira Cymone Martins Cotrim , Gusmão Tânia Cristina Rocha Silva
Published: April 2020

Este artigo tem como objetivo apresentar elementos em uma perspectiva foucaultiana dos discursos na análise de um fragmento de aula de Matemática cuja questão trazida é sobre Densidade Demográfica. Tomaremos algumas ferramentas de análise que serão visitadas com maior ou menor frequência no decorrer do texto: o discurso, o saber, o poder e a resistência. Tencionou-se buscar o lugar de fala dos sujeitos, o saber construído no processo de aprendizagem matemática, o exercício do poder e identificar elementos de resistência no contexto da sala de aula, onde a atividade foi aplicada. Conclui-se que a instituição escolar, lugar de produção e circulação dos discursos, evidencia um modo de pensar exercendo um poder que inclui, exclui e controla os saberes.
Palavras-chave: Discursos. Saber matemático. Poder. Resistência.
O pensamento geométrico na licenciatura em Matemática: uma análise à luz de Duval e Van-Hiele
Authors: Costa André Pereira , Santos Marilene Rosa
Published: April 2020

Nesta pesquisa, analisamos o pensamento geométrico de estudantes da licenciatura em Matemática de uma universidade em Pernambuco. Fundamentamo-nos na Teoria dos Registros de Representação Semiótica de Duval (1995), que apresenta um modelo teórico sobre o funcionamento cognitivo no campo da Geometria e na teoria de desenvolvimento do pensamento geométrico de Van-Hiele (1957), que indica um modelo de níveis de compreensão dos conceitos geométricos. Participaram da pesquisa 34 acadêmicos que já tinham cursando disciplinas relacionadas à Geometria. Esses participantes responderam uma questão que abordou o conceito de quadriláteros notáveis. Os resultados indicaram que quase a metade desses participantes atuava na apreensão perceptiva de Duval (1995) e no primeiro nível de Van-Hiele (1957), caracterizados pela identificação das figuras geométricas em um plano ou espaço por meio da aparência física. Concluímos que a articulação entre as teorias de Duval (1995) e de Van-Hiele (1957) possibilitou uma melhor compreensão do pensamento geométrico dos estudantes.
Palavras-chave: Duval. Van-Hiele. Quadriláteros. Pensamento Geométrico.
Educação Financeira: abordagem nos livros didáticos de Matemática para o Ensino Médio
Authors: Marim Vlademir , Silva Maxwell Gomes
Published: April 2020

Esta pesquisa tem como objetivo analisar as propostas significativas apresentadas nos livros didáticos de Matemática do Ensino Médio, no que diz respeito à Educação Financeira, que possam contribuir para a formação do professor de Matemática do Ensino Médio. Para atender a esse objetivo, optou-se pelo uso da metodologia comparada para justapor os dados concretos e abstrair as informações pertinentes ao estudo. Para a análise, considerou-se três eixos: livros didáticos, manual do professor e ensino e aprendizagem do docente. Conclui-se ser necessário olhar atentamente às possibilidades interdisciplinares para a Educação Financeira. Em geral, os livros abordam parte dessa formação, concentrando-se em cálculos, fórmulas e problemas envolvendo juros, prejuízos e empréstimos para o estudo da Matemática Financeira.

Palavras-chave: Educação Financeira. Metodologia comparada. Formação docente. Matemática.
Dificuldades nos processos de ensino e de aprendizagem de Cálculo Diferencial e Integral
Authors: Macêdo Josué Antunes , Gregor Isabela Cristina Soares
Published: April 2020

A disciplina de Cálculo Diferencial e Integral (CDI) é ministrada em seis dos nove cursos superiores do Instituto Federal de Educação Ciência e Tecnologia do Norte de Minas Gerais (IFNMG), campus Januária, e possui um alto índice de reprovação comparado com outras disciplinas. Este artigo mostra os resultados de uma pesquisa em que se buscou encontrar respostas para as principais dificuldades enfrentadas por alunos e professores da disciplina de CDI, em relação aos processos de ensino e de aprendizagem. Para a obtenção dos dados foram aplicados questionários aos alunos da disciplina e aos professores que ministram ou já ministraram tal disciplina no campus, bem como monitorias para um grupo de alunos. Os resultados mostram a realidade no ensino e na aprendizagem de CDI no campus Januária e abre as portas para discussões acerca desta problemática que abrange não só o IFNMG, como também outras instituições de Ensino Superior no Brasil.
Palavras-chave: Cálculo Diferencial e Integral. Dificuldades de aprendizagem. Ensino Superior.
Modelagem na Educação Matemática para o desenvolvimento de conceitos de Análise Combinatória
Authors: Bastos Ticiano Azevedo , Rosa Milton
Published: April 2020

Esse artigo tem como base uma pesquisa de mestrado que teve como objetivo identificar como a perspectiva sociocrítica da Modelagem Matemática poderia contribuir para o desenvolvimento de conceitos de Análise Combinatória. A pesquisa foi realizada com 17 alunos do 2º ano do Ensino Médio de uma escola particular no vale do Rio Doce, na região leste do estado de Minas Gerais e com um professor de Educação Física. A abordagem metodológica utilizada nesse estudo foi qualitativa e os dados foram produzidos por meio de quatro blocos de atividades, dois questionários e uma entrevista semiestruturada, que foram conduzidos no período de setembro a novembro de 2018. Os resultados mostraram que as contribuições desse estudo estavam relacionadas com o desenvolvimento ativo da aprendizagem de conceitos combinatórios por meio de um olhar crítico sobre as práticas de treinamentos de musculação nas academias pesquisadas.

Palavras-chave: Modelagem Matemática. Perspectiva Sociocrítica. Análise Combinatória. Ensino Médio. Fichas de Treino em Academias.
Modelagem Matemática: um olhar semiótico
Authors: Veronez Michele Regiane Dias , Chulek Carina
Published: April 2020

O desenvolvimento de uma atividade de modelagem matemática a partir dos interpretantes produzidos por alunos de um primeiro ano do Ensino Médio é focalizado nesse texto à luz da teoria semiótica peirceana. A metodologia que subsidia o estudo realizado é de cunho qualitativo, já que temos por interesse discutir acerca dos signos produzidos pelos alunos ao longo do desenvolvimento de uma atividade de modelagem matemática. Como resultados, ponderamos que o processo de geração de (signos) interpretantes depõe (des)conhecimentos dos alunos, seja sobre Matemática, seja sobre a situação e/ou problema que desencadeou a atividade de modelagem matemática em foco. Além disso, esse processo favorece uma dinamicidade na geração dos interpretantes, proporcionada devido ao uso do software GeoGebra e leva os alunos a assumirem atitudes autônomas ao longo do desenvolvimento da atividade de modelagem matemática.

Palavras-chave: Modelagem Matemática. Semiótica. Tecnologia. Interpretantes.
Concept «Smart freight wagon»
Authors: Łukasik Zbigniew , Ushakov Anton
Published: April 2020

This article discusses the prospects for the implementation of the concept «Smart freight wagon» on the Russian railways. The article discusses a concept for developing in Russia a system for monitoring the operating conditions of rolling stock and transmitting telemetry data on the state of infrastructure under the design names «Smart freight wagon. Also, authors offer the author’s concept of this system improvements based on openHAB smart system model which helps to make the modular system in order to increase fault tolerance and flexibly adapt to the needs of specific customers.
Ways of protection from noise pollution in railway and tramway infrastructure
Authors: Szabłowska Paulina , Rochel Maciej
Published: April 2020

The paper presents various ways of protection from traffic noise used in railway infrastructure in Poland. The sources of noise in rail and tram transport were discussed. Also commonly found solutions on the railway network were analyzed such as noise barriers and rail dampers. Modern tram surfaces have been presented as one of the noise protection methods in the tram infrastructure. In the tram infrastructure a noise protection method was presented in the form of tram track lubricators on sharp curves. In addition, the effectiveness of noise protection methods was assessed on the basis of tests and research.
Estimating probability of faults occurring in trucks
Authors: Kupiec Agnieszka , Kupiec Jerzy
Published: April 2020

This paper discusses the matter of fault detection by the diagnosticians of a Regional Vehicle Inspection Station (RVIS) in trucks. The analysis data were obtained directly from RVIS. The produced results were presented as bar graphs indicating the trend change from 2014 to 2018. Thus obtained trends were described by formulae and used to calculate the probability of a fault from the analysed group appearing. The obtained data dependency can be used to calculate the probability of a fault appearing in a truck during a year of operation.
criação do Banco do Nordeste e o Congresso Nacional
Authors: Barbalho Alexandre
Published: April 2020

O artigo analisa a reação do sistema político tradicional, mais especificamente da elite parlamentar brasileira, diante da proposição de criação do Banco do Nordeste do Brasil em 1959. Parte-se do pressuposto de que a futura instituição seria uma agência insulada de demandas clientelistas e corporativistas o que poderia minar as bases eleitorais sustentadas em relações personalistas. A partir do método posicional e da análise de documentos, investigou-se as tomadas de posição dos congressistas durante a tramitação no Congresso da referida proposta, tanto em suas falas no plenário da Câmara, quanto em seus depoimentos à imprensa. Como conclusão, a análise revelou que houve um consenso nacional em torno da nova instituição, para além de clivagens partidárias e regionais.

Palavras-Chave: Sistema Político. Elite Política. Parlamento. Região Nordeste. Desenvolvimento Regional.
Solutions of the Diophantine Equation 7X
2 + Y
7 = Z
2 from Recurrence Sequences
Authors: Hashim Hayder R.
Published: April 2020

Consider the system x
2 − ay
2 = b, P (x, y) = z
2, where P is a given integer polynomial. Historically, the integer solutions of such systems have been investigated by many authors using the congruence arguments and the quadratic reciprocity. In this paper, we use Kedlaya’s procedure and the techniques of using congruence arguments with the quadratic reciprocity to investigate the solutions of the Diophantine equation 7X
2 + Y
7 = Z
2 if (X, Y) = (L

n
, F

n
) (or (X, Y) = (F

n
, L

n
)) where {F

n
} and {L

n
} represent the sequences of Fibonacci numbers and Lucas numbers respectively.
Illinois Pharmacists and Over the Counter Cannabidiol Products: A Survey on Knowledge and Educational Needs
Authors: Link Kayla , Deshpande Maithili , Ferguson McKenzie
Published: April 2020

Objective: To assess Illinois pharmacists’ (1) baseline knowledge of CBD and self-rated competency of OTC-CBD product pharmacotherapy, (2) concerns about OTC-CBD product safety and level of preparedness with answering questions about the product, and (3) current and future interest in learning more about these types of products to target an area of need for continuing education in the pharmacy field.

Design: This observational cross-sectional study used a quantitative survey to obtain information about Illinois pharmacists’ knowledge, concerns and educational needs about OTC-CBD products. Survey questions were based on prior research and pilot tested for clarity and completeness. Descriptive statistics were utilized to assess all data.

Setting and Participants: The study researchers collaborated with two state-based pharmacy organizations to distribute the survey online with up to two reminders.

Results: A total of 181 participants completed the survey. Majority of the respondents were 31-60 years of age, had worked in pharmacy for less than 5 years, in a geographic location with a population of 50,000 or more. About 41% worked in hospital-based practice setting and 39.2% work in a community-based setting. Most pharmacists (64.1%) reported ever being asked about the safety or efficacy of cannabidiol containing products, and only 20.7% responded that they felt moderately/highly prepared to provide medication counseling to patients who use OTC-CBD products. Majority of respondents reported being concerned about safety, quality, and regulations related to OTC-CBD products. Almost all respondents indicated that information about state (90.5%) and federal (89.4%) laws related to CBD, and safety (99.5%) were preferred topics for future education.

Conclusions: Consumers are seeking information about CBD containing products; however, many pharmacists do not feel prepared when it comes to being the drug expert for these products. Educational opportunities are necessary for pharmacists to become more comfortable and knowledgeable regarding safe and effective use of CBD-OTC containing products.

 

Article Type: Original Research
Peningkatan Hasil Belajar Matematika Menggunakan Pendekatan Contextual Teaching And Learning Pada Materi Bangun Datar Segi Empat
Authors: Rahmawati Nurina Kurniasari , Kusuma Arie Purwa
Published: April 2020

This study aims to improve student activity and student mathematics learning outcomes through the Contextual Teaching And Learning learning method for VII grade students of AR Rahmah Ujung Krawang, East Jakarta 2019/2020. This research is a classroom action research. The research subjects are Grade VII students of AR Rahmah Ujung Krawang, totaling 30 students. Data collection techniques were taken using observations, field notes, documentation, and tests. Analysis of the data from this study was descriptive qualitative, namely by analyzing student development data from cycle I to cycle III. The results showed that an increase in student activity can be seen from the increase in student activity in the first cycle by 56.25%, in the second cycle 68.75% and in the third cycle reached 8.38%. While the improvement in student learning outcomes can be seen from working on exercises with the achievement of KKM scores, before action 41.66%, in the first cycle obtained an average of 69.33 with a percentage of 53.33%, the second cycle obtained an average of 76 with a percentage of 70, 00%, and the third cycle obtained an average of 80 with a percentage of 86.67%. The conclusion of this study is that through the Contextual Teaching And Learning learning method obtained mathematics learning outcomes of VII grade students of AR Rahmah Ujung Krawang, East Jakarta.
Mielinólise extrapontina secundária à hipernatremia: estudo de caso com desfecho favorável
Authors: Neto Adalberto Rosa , Kahwage Carolina Barros , Neto Salomão Georges Kahwage
Published: April 2020

Objetivo: Detalhar o caso de uma paciente que evoluiu com mielinólise extrapontina secundária à hipernatremia. Detalhamento do caso: Paciente adulta iniciou quadro de cefaleia unilateral, fraqueza muscular e engasgos constantes progressivos. Após episódio de broncoaspiração de grande quantidade, necessitou intubação orotraqueal. No âmbito hospitalar, detectado sódio sérico de 180 mEq/L na entrada, que foi corrigido ao longo de 7 dias até sua normalização. O quadro clínico de tetraparesia inicial foi melhorado na medida em que os níveis de sódio normalizavam e uma ressonância magnética de controle mostrou regressão total das lesões. Atualmente, em acompanhamento no regime ambulatorial com poucas sequelas após o ocorrido. Considerações Finais: As síndromes de desmielinização osmótica podem ter apresentações variadas de acordo com o local acometido no encéfalo. Não é possível prever o desfecho, podendo ser totalmente favorável ou catastrófico. Necessitam maior atenção as correções de distúrbios hidroeletrolíticos, pois a prevenção ainda se configura na melhor alternativa para estes pacientes.
Riskten Korunma Muhasebesinin Türkiye’deki Bankalarda Uygulanmasi ve Raporlanmasi – 2018
Authors: ÇİFTCİ Havva Nur
Published: April 2020

Türk bankacılık sektöründe türev ürün kullanımı 1980’li yıllara dayanmasına rağmen bu ürünlerin aktif bir şekilde kullanımı 2000’li yıllardan itibaren başlamıştır. 2000 yılı öncesine kadar birkaç işlemle sınırlı kalan türev ürün kullanımı, meydana gelen bankacılık krizleri ve serbest döviz sistemine geçiş sonucunda bankaları aktif bir şekilde türev ürün kullanımına yöneltmiştir. Çalışmada, Türk Bankacılık sektöründe faaliyet gösteren bankaların türev ürün kullanımı ve riskten korunma muhasebesi uygulamalarının araştırılması amaçlanmıştır. Bu kapsamda Türkiye’de faaliyet gösteren ticari, katılım ve kalkınma ve yatırım bankaları olmak üzere toplam 42 bankanın Türkiye Finansal Muhasebe Standartlarına göre hazırlanmış ve bağımsız denetimden geçmiş 2018 yılı finansal tabloları ve dipnotları incelenmiştir. Çalışmada bankaların sözleşme bazında türev ürün kullanımı ve riskten korunma muhasebesi uygulamalarının finansal tablolarda raporlanması hakkında bilgi toplanmıştır. Bu çalışma İstanbul Üniversitesi Bilimsel Araştırma Projeleri Koordinasyon Birimi tarafından desteklenmiştir. Proje numarası 47160.
BIST Kimya Ve Metal Ana Sanayi Sektörlerindeki İmalat İşletmelerinde Maliyet Yapışkanlığının Test Edilmesine İlişkin Bir Uygulama
Authors: BENGÜ Prof. Dr. Haluk , FİDANCAN Can
Published: April 2020

Maliyet davranışı ile ilgili teorik yaklaşımlar, geleneksel maliyet davranışı çerçevesinde, maliyetlerin faaliyet artış ve azalışına aynı derecede simetrik bir şekilde tepki verdiği yönündedir. Buna karşılık olarak ampirik çalışmalarda, maliyetlerde faaliyet hacmine bağlı olarak meydana gelen artışlar ile azalışın aynı oranda gerçekleşmediğini ve bunların asimetrik bir şekilde gerçekleştiğini gösteren bulgulara rastlanmaktadır. Bu çalışmada maliyet yapışkanlığını test etmek amacıyla BIST imalat sektöründe yer alan kimya ve metal ana sanayi sektörleri ayrı ayrı ve karşılaştırmalı olarak incelenmiştir. Zaman serisi ve yatay kesit verilerinin bir arada ele alındığı panel veri analizinin diğer ekonometrik yöntemlere göre daha fazla bilgi sağlayabilmesi sebebiyle panel veri analiz yönteminden yararlanılan bu çalışmada analiz dönemi 2009 – 2018 olarak belirlenmiş ve çeyrek frekanstaki verilerden yararlanılmıştır. Çalışmaya konu veriler Kamuyu Aydınlatma Platformundan (KAP) elde edilmiştir. Çalışma satışlar ile satışların maliyeti, satışlar ile pazarlama satış ve dağıtım giderleri ve satışlar ile genel yönetim giderlerinin dahil edildiği üç farklı model çerçevesinde incelenmiştir. Çalışmada yapılan testler neticesinde ele alınan sektörlerdeki işletmelerin satışlardaki yükselme ve düşüşlerin olduğu dönemlerde satışların maliyetinin doğrusal olarak etkilendiği ve asimetrinin olmadığı tespit edilmiştir.
Feature-Based Molecular Networking Analysis of the Metabolites Produced by in vitro Solid-State Fermentation Reveals Pathways for the Bioconversion of Epigallocatechin Gallate
Authors: Xie Hao-Fen , Kong Ya-Shuai , Li Ru-Ze , Zhang Hong , Liu Lu-Lu , An Ting-Ting , Liu Rui , Yang Zi , Ke Jia-Ping , Zhang Peng , Zhao Ming , Bao Guan-Hu , Xie Zhong-Wen , Li Da-Xiang , Wan Xiaochun , Dai Qian-Ying , Zhang Liang , An Mao-Qiang , Melnik Alexey V. , Long Yan-Hua , Ling Tie-Jun
Published: April 2020

Flavan-3-ol B-ring fission derivatives (FBRFDs) are secondary metabolites that contribute to the unique properties of fermented dark teas. However, the FBRFD precursors and biochemistry are unclear. Fungal strains cultured from Fuzhuan brick tea (FBT) were incubated in an in vitro solid-state fermentation system containing β-cyclodextrin-embedded epigallocatechin gallate (EGCG), a potential precursor of FBRFDs. The produced metabolites were analyzed through a combination of targeted chromatographic isolation, non-targeted spectroscopic identification, and Feature-based Molecular Networking (FBMN) in the Global Natural Products Social Molecular Networking (GNPS) platform. Dihydromyricetin was identified for the first time, indicating that fungi possess a flavan-3-ol C-ring oxidation pathway. EGCG was verified as the precursor of dihydromyricetin and FBRFDs such as teadenol A and fuzhuanin A. The conversion was driven by the fungi rather than a hygrothermal effect. Isolates from Pezizomycotina showed much stronger abilities to convert EGCG to the B-/C-ring oxidation products than those from Saccharomycotina or Basidiomycota.
Mechanistic Molecular Motion of Transition-Metal Mediated Beta-Hydride Transfer: Quasiclassical Trajectories Reveal Dynamically Ballistic, Dynamically Unrelaxed, Two Step, and Concerted Mechanisms
Authors: Wheeler Josh , Carlsen Ryan , Ess Daniel
Published: April 2020

The transfer of a -hydrogen from a metal-alkyl group to ethylene is a fundamentalorganometallic transformation. Previously proposed mechanisms for this transformation involve either atwo-step -hydrogen elimination and migratory insertion sequence with a metal hydride intermediateor a one-step concerted pathway. Here, we report density functional theory (DFT) quasiclassical directdynamics trajectories that reveal new dynamical mechanisms for the -hydrogen transfer of[Cp*RhIII(Et)(ethylene)]Despite the DFT energy landscape showing a two-step mechanism with a Rh-Hintermediate, quasiclassical trajectories commencing from the -hydrogen elimination transition staterevealed complete dynamical skipping of this intermediate. The skipping occurred either extremely fast(typically <100 femtoseconds (fs)) through a dynamically ballistic mechanism or slower through adynamically unrelaxed mechanism. Consistent with trajectories begun at the transition state, alltrajectories initiated at the Rh-H intermediate show continuation along the reaction coordinate. All ofthese trajectory outcomes are consistent with the Rh-H intermediate <1 kcal/mol stabilized relative tothe -hydrogen elimination and migratory insertion transition states. For Co, which on the energylandscape is a one-step concerted mechanism, trajectories showed extremely fast traversing of thetransition-state zone (<50 fs), and this concerted mechanism is dynamically different than the Rhballistic mechanism. In contrast to Rh, for Ir, in addition to dynamically ballistic and unrelaxedmechanisms, trajectories also stopped at the Ir-H intermediate. This is consistent with an Ir-Hintermediate that is stabilized by ~3 kcal/mol relative to the -hydrogen elimination and migratoryinsertion transition states. Overall, comparison of Rh to Co and Ir provides understanding of therelationship between the energy surface shape and resulting dynamical mechanisms of anorganometallic transformation.
Quantification of Inactive Lithium and Solid Electrolyte Interphase (SEI) Species on Graphite Electrodes After Fast Charging
Authors: McShane Eric , Colclasure Andrew , Brown David , Konz Zachary M. , Smith Kandler , McCloskey Bryan D.
Published: April 2020

Rapid charging of Li-ion batteries is limited by lithium plating on graphite anodes, whereby Li+ ions are reduced to Li metal on the graphite particle surface instead of inserting between graphitic layers. Plated Li metal not only poses a safety risk due to dendrite formation, but also contributes to capacity loss due to the low reversibility of the Li plating/stripping process. Understanding when Li plating occurs and how much Li has plated is therefore vital to remedying these issues. We demonstrate a titration technique with a minimum detection limit of 20 nmol (5×10-4 mAh) Li which is used to quantify inactive Li that remains on the graphite electrode after fast charging. Additionally, the titration is extended to quantify the total amount of solid carbonate species and lithium acetylide (Li2C2) within the solid electrolyte interphase (SEI). Finally, electrochemical modeling is combined with experimental data to determine the Li plating exchange current density (10 A/m2) and stripping efficiency (65%) of plated Li metal on graphite. These techniques provide a highly accurate measure of Li plating onset and quantitative insight into graphite SEI evolution during fast charge.
Fast and Extensive Intercalation Chemistry in Wadsley-Roth Phase Based High-Capacity Electrodes
Authors: Wang Miao , Yao Zhenpeng , Li Qianqian , Hu Yongfeng , Zhang Jing , Zhang Jiujun , Zhao Yufeng , Aspuru-Guzik Alan
Published: April 2020

Wadsley-Roth (W-R) structured oxides featured with wide channels represent one of the most promising material families showing compelling rate performance for lithium ion batteries. But the structural origin for the fast kinetics of W-R structures is not well understood. Herein, we report an in-depth study on the fast and extensive intercalation chemistry of phosphorus stabilized W-R phase PNb9O25 and its application in high energy and fast-charging devices. We explore the intercalation geometry of PNb9O25 and identify two geometrical types of stable insertion sites with the total amount (2.22 per Nb ion) much higher than conventional intercalation-type electrodes. We reveal the ion transportation kinetics that the Li ions initially diffuse along the open type III channels and then penetrate to type-α edge sites with low kinetic barriers. Through in-situ TEM and ex-situ XRD investigations, we confirm that the whole intercalation/deintercalation process proceeds via a solid-solution behavior with continuous lithium (de)occupying/(re)ordering on the identified insertion sites exhibiting nearly “zero-stress” characteristics. Therefore, the oxide framework of PNb9O25 keeps almost intact with all the fast diffusion channels and insertion cavities well-maintained upon cycling, which accomplishes the unconventional electrochemical performance of W-R structured electrodes.
Experimental Dataset of Electrochemical Efficiency of a Direct Borohydride Fuel Cell (DBFC) with Pd/C, Pt/C and Pd Decorated Ni–Co/rGO Anode Catalysts
Authors: Hamidi Sarmin , Sabouri Sadra , Haghighi Sepand , Askari Kasra
Published: April 2020

Dataset includes Direct Borohydride Fuel Cell (DBFC) impedance and polarization test in anode with Pd/C, Pt/C and Pd decorated Ni–Co/rGO catalysts. In fact, different concentration of Sodium Borohydride (SBH), applied voltages and various anode catalysts loading with explanation of experimental details of electrochemical analysis are considered in data. Voltage, power density and resistance of DBFC change as a function of weight percent of SBH (%), applied voltage and amount of anode catalyst loading that are evaluated by polarization and impedance curves with using appropriate equivalent circuit of fuel cell. Can be stated that interpretation of electrochemical behavior changes by the data of related cell is inevitable, which can be useful in simulation, power source investigation and depth analysis in DB fuel cell researches.