bluuebunny/crossref_metadata_2025_split huggingface dataset:
Rest Redistribution Does Not Alter Hormone Responses in Resistance-Trained Women
Authors: Merrigan Justin J. , Tufano James J. , Fields Jennifer B. , Oliver Jonathan M. , Jones Margaret T. 
Published: June 2020

Abstract
Merrigan, JJ, Tufano, JJ, Fields, JB, Oliver, JM, and Jones, MT. Rest redistribution does not alter hormone responses in resistance-trained women. J Strength Cond Res 34(7): 1867–1874, 2020—The purpose was to examine acute effects of rest redistribution (RR) on perceptual, metabolic, and hormonal responses during back squats. Twelve resistance-trained women (training age 5 ± 2 years; one repetition maximum [1-RM] per body mass, 1.6 ± 0.2) performed traditional (TS, 4 sets of 10 repetitions with 120 seconds interset rest) and RR sets (4 sets of two 5 repetition clusters with 30-second intraset rest and 90-second interset rest) in counterbalanced order, separated by 72 hours. Both conditions were performed at 70% 1RM with 360 seconds of total rest. Ratings of perceived exertion (RPE) were taken after each set. Blood was sampled at baseline, after each set, and at 5, 15, 30, and 60 minutes, as well as 24 and 48 hours after training. Alpha level was p ≤ 0.05. The RPE progressively increased throughout both conditions (p = 0.002) with a greater overall mean for TS (5.81 ± 0.14) than RR (4.71 ± 0.14; p = 0.003). Lactate increased above baseline and remained elevated through 15 minutes post in both conditions (4.00 ± 0.76; p = 0.001), with greater lactate levels for TS (6.33 ± 0.47) than RR (4.71 ± 0.53; p < 0.001). Total testosterone was elevated after set 2 (0.125 ± 0.02; p = 0.011), but no other time point, while free testosterone remained unchanged. Growth hormone continually rose from baseline to set 3 and returned to baseline by 60 minutes post (20.58 ± 3.19). Cortisol and creatine kinase did not change over time. No condition × time interactions existed for any hormone (p > 0.05). Use of rest redistribution resulted in lower perceived effort and lactate responses. Yet, hormone responses during rest redistribution were no different from TS.
Neuromuscular Fatigue in Pitchers Across a Collegiate Baseball Season
Authors: Stone Brandon L. , Schilling Brian K. 
Published: June 2020

Abstract
Stone, BL and Schilling, BK. Neuromuscular fatigue in pitchers across a collegiate baseball season. J Strength Cond Res 34(7): 1933–1937, 2020—Neuromuscular fatigue in baseball pitchers has become an important aspect of injury risk. It is imperative to understand how fatigue is manifested to enhance resiliency and mitigate injury risk. Secondarily, collecting data on neuromuscular characteristics of baseball pitchers provides a framework to address these concerns. Using the countermovement jump, this study observed neuromuscular performance during the preseason, midseason, and postseason of a collegiate baseball season with college baseball pitchers. No statistically significant changes were noted in any of the main variables at any testing timepoint (p > 0.05). However, several variables, including concentric mean force (ConMF, d = 0.59) and concentric peak force (ConPF, d = 0.59) in addition to eccentric mean force (EccMF, d = 0.54) and eccentric mean power (EccMP, d = −0.66), displayed moderate effects from preseason testing to midseason testing. Furthermore, jump height displayed a large negative effect from preseason to midseason (d = −0.89). Secondarily, descriptive data for both concentric and eccentric variables were also determined from the present findings. There were moderate changes in neuromuscular fatigue in Division I collegiate pitchers across a competitive season and has provided descriptive data for neuromuscular characteristics in collegiate baseball pitchers.
De Novo Genome Assemblies for Three North American Bumble Bee Species: Bombus bifarius, Bombus vancouverensis, and Bombus vosnesenskii
Authors: Heraghty Sam D , Sutton John M , Pimsler Meaghan L , Fierst Janna L , Strange James P , Lozier Jeffrey D 
Published: June 2020

Abstract
Bumble bees are ecologically and economically important insect pollinators. Three abundant and widespread species in western North America, Bombus bifarius, Bombus vancouverensis, and Bombus vosnesenskii, have been the focus of substantial research relating to diverse aspects of bumble bee ecology and evolutionary biology. We present de novo genome assemblies for each of the three species using hybrid assembly of Illumina and Oxford Nanopore Technologies sequences. All three assemblies are of high quality with large N50s (&gt; 2.2 Mb), BUSCO scores indicating &gt; 98% complete genes, and annotations producing 13,325 – 13,687 genes, comparing favorably with other bee genomes. Analysis of synteny against the most complete bumble bee genome, Bombus terrestris, reveals a high degree of collinearity. These genomes should provide a valuable resource for addressing questions relating to functional genomics and evolutionary biology in these species.
On plasmon contribution to the hot A0 condensate
Authors: Borisenko O. A. , Skalozub V. V. 
Published: June 2020

In SU(2) gluodynamics, the Debye gluon contribution WD(A0) to the effective action of the temporal gauge field component (we consider A0 = const) in the background Rξext is calculated at high temperaturegauge. It is shown that at A0 ≠ 0 the standard definition k0 = 0 , |k| → 0 corresponds to long distance correlations for the longitudinal in internal space gluons. The transversal gluons become screened by the A0 background field. Therefore, they give zero contributions and have to be excluded from the correlation corrections. The total effective action accounting for the one-loop, two-loop, and correct WD(A0) satisfies Nielsen’s identity that proves gauge invariance of the A0 condensation phenomenon.
Wettability and solubility behavior of Fe–B–C binder on (Cr–Ti–C)-reinforced composites
Authors: Sukhova O. V. 
Published: June 2020

Iron-base matrix composites containing Cr-20Ti-10C reinforcement fabricated by infiltrating at 1200°C to 1280°C for 30 to 60 mins are investigated in this work. Peculiarities of the formation of the interfaces between Cr-20Ti-10C hard alloy and Fe-3.1B-0.1C liquid alloy (wt. pct) are determined. It includes the study of the solubility between the iron-base binder and the reinforcement combined with the investigation of the contact angles of the liquid phase formed at infiltration temperature by sessile drop method. X-ray analysis as well as optical and scanning electron microscopy is employed to investigate the binder/particulate interfaces. The interfacial zones produced as a result of contact interaction consist of (Cr,Ti)7C3 and (Ti,Cr)3C phases embedded in α-Fe3(C,B) eutectic alloyed with Cr and Ti. The origin of the formation of the interfaces is probably related to the partial dissolution of the low-melting-temperature particulate phase identified as (Cr,Ti)7C3 in the molten Fe–B–C binder. When raising the infiltrating temperature and prolonging the infiltrating period, wetting properties of Cr-20Ti-10C improve. This fact opens the possibility to replace copper-base alloys as binder by a cheaper and stronger iron-base alloy.
Lattice vibrations of the molecular crystal of photoreactive substance with defects
Authors: Syetov Y. 
Published: June 2020

Lattice vibrations are studied theoretically by density-functional based tight-binding methods for the model structure of 2-(2'-hydroxyphenyl)benzoxazole crystal with defects. 2-(2'-hydroxyphenyl)benzoxazole is a photoreactive compound that exhibits excited state intramolecular proton transfer in the structure with an OH...N hydrogen bond. The unit cell of the model structure consists of two crystal unit cells where the molecules have the structure with intramolecular hydrogen bonds OH...N and one molecule is supposed to have a different orientation of the whole molecule or its fragment. The different orientation of the fragment forms the structure with an intramolecular hydrogen bond OH...O. It is calculated that defect caused by the different orientation of the molecule have a lower energy than the defect caused by the different orientation of the fragment. In the frequency region where the contribution of external vibrations of the molecules is significant, the vibrations mainly involve several molecules in the cell. In the region of internal vibrations there are modes, which are local vibrations of the defects. These local vibrations involve mainly motion of the atoms constituting the defect molecule. The number of local vibrations is larger for the defect that corresponds to the formation of the structure with the OH...O hydrogen bond than for the defect that corresponds to the different orientation of the whole molecule with the OH...N hydrogen bond. The internal vibrations of the defect molecule formed by the different orientation of phenol fragment in the lattice undergoes frequency shift in relation to the frequency of the modes of isolated molecule.
Conductivity of grains in nonlinear oxide ceramics and protective properties of varistors
Authors: Ivon A. I. , Lavrov R. I. 
Published: June 2020

The current-voltage characteristics of various compositions of nonlinear varistor ceramics based on ZnO (ZOC) and SnO2 (TOC) are studied in a wide range of electric current. On the basis of obtained data were determined the parameters that allow finding the coefficients kprs and kprl, which define the protection levels against the switching surge and the lightning surge for surge suppressors on the basis of ZOC and TOC varistors. The lower the value of these coefficients are, the significantly higher the efficiency of surge protection is. A relationship between kprs, kprl, and the effective linear resistivity ρlin limiting the current of intergranular barriers in varistor ceramics are established. It is shown that the values of kprs and kprl increase with increasing ρlin, which value is determined by the bulk resistance of the ceramic grains. The studied TOC compositions have 2-3 times larger values of ρlin and more high values of kprs and kprl than ZOC. ZOC-based varistors with lower kprs and kprl values provide more effective surge protection than TOC-based varistors.
Pandemics, privacy, and public health research
Authors: Bernier Alexander , Knoppers Bartha Maria 
Published: June 2020

AbstractSharing data expediently for pandemic response purposes exposes healthcare providers in Canada to significant regulatory uncertainty. Duplicative and contradictory ethical and legal duties flowing from overlapping sources can stifle flows of medical data among clinicians, researchers, and institutions. Authorities should support caregivers and accelerate research by providing clear guidance to the health sector. Institutions should foster robust data stewardship and standardize their practices to those recognized among the international health informatics community. Reform is critical to ensuring Canadian healthcare providers can deliver efficient health responses that are integrated with dispersed and disparate national and international approaches.
Modelamiento de Superficies en Coordenadas Esféricas a Través de GeoGebra
Authors: Osorio Alejandro I. Flores , Costa Nielce M. Lobo da , Peña Dennis A. Espejo , Montesinos Lenin R. Cabracancha 
Published: June 2020

Este artículo tiene como objetivo presentar una herramienta que permita ayudar la enseñanza y el aprendizaje de graficar y describir superficies en coordenadas esféricas, a través del software libre GeoGebra, para lo cual se va representar superficies convencionales y no convencionales, así como sólidos que están limitados por un número finito de superficies por medio de parametrizaciones basadas en coordenadas esféricas y luego presentarlas en la vista gráfica 3D de GeoGebra usando el comando Superficie, de esta forma se tiene una inmejorable visualizar, percepción, manipulación y comprensión del esbozo de superficies en el espacio en un ambiente dinámico y amigable. Finalizamos con un caso de aplicación de modelado del planetario más grande del mundo aplicando superficies paramétricas basadas en las coordenadas esféricas.

Palabras-clave: Modelamiento. Superficies. Parametrización. Coordenadas Esféricas. GeoGebra.
Abstract
This article aims to present a tool that aids the teaching and learning of graphing and describing surfaces in spherical coordinates, through the free GeoGebra software, for which specific and non-specific surfaces will be represented, as well as solids that are limited by a finite number of surfaces by means of parameterizations based on spherical coordinates and then present them in the GeoGebra 3D graphic view using the Surface command, in this way you have an unbeatable visualization, perception, manipulation and understanding of the outline of surfaces in the space in a dynamic and friendly environment. We conclude with a case of modeling application of the largest planetarium in the world applying parametric surfaces based on spherical coordinates
Keywords: Modeling. Surfaces. Parameterization. Spherical Coordinates. GeoGebra.
A Economia Doméstica e Rural Presente no Capítulo XII da Obra Rechenbuch für Deutsche Schulen in Brasillien 2º Heft, de Matheus Grimm
Authors: Britto Silvio Luiz Martins , Bayer Arno 
Published: June 2020

O artigo analisa a obra Rechenbuch für Deutsche Schulen in Brasillien 2º Heft[1], de Matheus Grimm[2], com ênfase na seção XII, que aborda cálculos de economia doméstica e rural. Como o tema se insere na História da Educação Matemática, este estudo qualitativo e documental ampara-se na história cultural. A obra editada pela livraria Selbach, de Porto Alegre, teve sua primeira edição em 1900. O público-alvo eram os alunos do 3º e 4º ano elementar das escolas rurais teuto-brasileiras, unidocentes e mistas. A ideia era orientar os futuros colonos em suas receitas e despesas para administrar corretamente o orçamento familiar e gerenciar a produção na propriedade rural. Essa prática era comum nessas comunidades, pois havia o intuito de preparar as crianças para o futuro, com condições de realizar transações comerciais e dar continuidade aos negócios da família. Tais ações, contemporaneamente, fariam parte da denominada Educação Financeira, como objeto de conhecimento indispensável a ser trabalhado nas escolas brasileiras. As atividades desenvolvidas, a partir de situações-problema, estão relacionadas aos diferentes conteúdos matemáticos, envolvendo a aritmética, desenvolvendo habilidades para o manejo do cálculo escrito e mental por meio da resolução de problemas do cotidiano.

Palavras-chave: História da Educação Matemática. Ensino. Economia Doméstica e Rural.

Abstract
The article analyzes the book Calculation for German schools in Brazil 2nd notebook, by Matheus Grimm, with an emphasis on section XII, which addresses household and rural economy calculations. As the theme is inserted in the History of Mathematics Education, this qualitative and documentary study is based on cultural history. The book published by the bookstore Selbach, Porto Alegre, had its first edition in 1900. The target audience were the students of the 3rd and 4th elementary year of the rural schools in Brazil, unidocentes and mixed. The idea was to guide the future settlers in their income and expenses to properly manage the family budget and manage the production in the rural property. This practice was common in these communities, since it was intended to prepare the children for the future, able to carry out commercial transactions and give continuity to the family business. Such actions, at the same time, would be part of the denominated Financial Education, as an object of knowledge indispensable to be worked in Brazilian schools. The activities developed, based on problem situations, are related to different mathematical contents, involving arithmetic, developing skills for the management of written and mental calculation through the resolution of everyday problems.

Keywords: History of Mathematics Education. Teaching. Domestic and Rural Economy.
Derivadas Parciais: um Estudo com Base na Teoria APOS
Authors: Rachelli Janice , Bisognin Vanilde 
Published: June 2020

Neste artigo, apresentamos os resultados de um estudo que tem como objetivo investigar as construções mentais desenvolvidas pelos estudantes de um curso de mestrado em ensino de Matemática para a compreensão do conceito de derivadas parciais, tendo a teoria APOS como referencial teórico e metodológico. Para tanto, elaboramos a decomposição genética em que foram descritas as possíveis estruturas e mecanismos mentais necessários à construção do conceito e desenvolvemos situações de ensino em sala de aula em uma disciplina que trata dos fundamentos do Cálculo, tendo o ciclo ACE como metodologia de ensino. Os resultados obtidos, por meio dos registros dos alunos e das anotações no diário de campo, indicam que os estudantes apresentam algumas dificuldades em trabalhar com problemas que requerem maior conhecimento conceitual, porém desenvolvem as construções mentais previstas na decomposição genética em atividades que possibilitam passo a passo o desenvolvimento de ações e a interiorização de processos para a encapsulação do objeto derivadas parciais, além da generalização ao tratar o esquema das derivadas parciais no contexto das equações diferenciais.

Palavras-chave: Teoria APOS. Decomposição Genética. Derivadas Parciais. Compreensão de Conceitos.

Abstract
In this article, we present the results of a study that aims to investigate the mental constructs developed by students of a master course in teaching Mathematics for understanding the concept of partial derivatives, based on the APOS theory as a theoretical and methodological reference. For that, the genetic decomposition was elaborated in which the possible mental structures and mechanisms necessary to the concept construction were described and classroom teaching situations were developed in a discipline that deals with the fundamentals of Calculus, with the ACE cycle as a teaching methodology. The results obtained through student records and field diary annotations indicate that students present some difficulties in working with problems that require greater conceptual knowledge, but they develop the mental constructions foreseen in the genetic decomposition in activities that make possible the sequence of steps, the development of actions, and the internalization of processes for the encapsulation of the partial derivative object, as well as generalization in dealing with the scheme of partial derivatives in the context of differential equations.

Keywords: APOS Theory. Genetic Decomposition. Partial Derivatives. Understanding Concepts.
Conhecimentos de Professores de Matemática em Início de Carreira Sobre o Campo Aditivo
Authors: Neves Almeida Rafael , Pietropaolo Ruy Cesar 
Published: June 2020

Este trabalho apresenta um estudo realizado com cinco professores de Matemática, em início de carreira, ex-bolsistas do Programa Institucional de Bolsa de Iniciação à Docência (Pibid), cujo objetivo foi evidenciar os Conhecimentos Didáticos e Curriculares dos participantes sobre o ensino de problemas do campo aditivo, conforme indicado pelos parâmetros curriculares nacionais. A coleta de dados se deu por meio de entrevistas e protocolos respondidos pelos professores. Como referenciais teóricos, no tocante ao início de carreira, foram utilizados os trabalhos de Huberman e Garcia. Em relação aos conhecimentos de professores necessários à docência optou-se por Ball, Thames e Phelps. A análise dos dados nos permitiu verificar que os professores no processo de ensino do campo aditivo dão bastante ênfase à ideia de combinar dois estados para obter um terceiro, não destacando outros importantes significados. Portanto, faz-se necessário uma ampliação na base de conhecimentos desses docentes para o ensino das operações.

Palavras-chave: Professores em Início de Carreira. Conhecimentos Matemáticos para o Ensino. Campo Aditivo. PIBID.

Abstract
In this work, we will present a study carried out with five early-career teachers, former scholarship recipients of the Programa Institucional de Bolsa de Iniciação a Docência (Pibid), whose objective was to highlight the participants' Didactic and Curricular Knowledge about the notion of addition. The data collection was done through interviews and protocols answered by the teachers. As theoretical references, regarding the beginning of the career, the works of Huberman (1995) and Garcia (1999) were used. Regarding the teachers' knowledge required for teaching, Ball, Thames and Phelps (2008) were chosen. The analysis of the data allowed us to verify that the teachers' knowledge about addition operation is restricted to the meaning of joining and that the idea most used to work with this theme in the classroom involves problem situations with money. Therefore, it is necessary to increase the knowledge base of these teachers.

Keywords: Teacher Early-Career Teachers. Mathematical Knowledge for Teaching (MKT).
Antecipação e Encaminhamento de uma Atividade de Modelagem Matemática no Contexto de Aulas de Educação Financeira
Authors: Da Silva Ariel Cardoso , Seki Jeferson Takeo Padoan , Pessoa da Silva Karina Alessandra 
Published: June 2020

Neste artigo apresentamos resultados de uma pesquisa em que consideramos a antecipação uma etapa inerente ao desenvolvimento de uma atividade de modelagem matemática e que pode auxiliar o professor a prever um encaminhamento em sala de aula. Para isso, desenvolvemos uma atividade de modelagem matemática, com o tema ‘orçamento familiar’, em duas disciplinas de um curso de Licenciatura em Matemática: matemática financeira e tecnologias em Educação Matemática. Fundamentados nos pressupostos teóricos da modelagem matemática como alternativa pedagógica e considerando uma pesquisa de abordagem qualitativa, analisamos os registros escritos e a transcrição dos áudios gravados no desenvolvimento da atividade, de forma descritiva e interpretativa. A análise nos possibilitou inferir que as relações que se estabelecem entre a antecipação e a prática com atividades de modelagem matemática, são dinâmicas e ocorrem a partir das reflexões do professor a respeito de suas intenções e das possíveis resoluções dos alunos, bem como pode sofrer (re)planejamentos.

Palavras-chave: Educação Matemática. Educação Financeira. Modelagem Matemática.

Abstract
In this paper we present results of a research in which we consider the anticipation an inherent step in the development of a mathematical modeling activity and that can help the teacher to predict a routing in the classroom. For this, we developed a mathematical modeling activity, with the theme 'family budget', in two disciplines of a course of Mathematics Degree: financial mathematics and technologies in Mathematics Education. Based on the theoretical assumptions of mathematical modeling as a pedagogical alternative and considering a qualitative approach, we analyze the written records and the transcription of recorded audio in the development of the activity, in a descriptive and interpretative way. The analysis allowed us to infer that the relationships established between anticipation and practice with mathematical modeling activities are dynamic and occur from the teacher's reflections about their intentions and possible student resolutions, as well as being able to suffer ( re)planning.

Palavras-chave: Mathematics Education. Financial Education. Mathematical Modeling.