bluuebunny/crossref_metadata_2025 huggingface dataset:
Transition in chemical and mineralogical composition around unweathered relicts of granodiorite in the kaolin deposit on Bornholm, Denmark
Authors: Bondam Jan , Störr Manfred
Published: August 2021

In the kaolin deposit near Rønne on the island of Bornholm in the Baltic Sea a number of well-rounded, unweathered, boulder-like relicts of the granodioritic parent rock are found, embedded in kaolin.
Samples have been taken of one relict at 2 cm interval from the fresh material outwards into the kaolin. The distribution pattern of the major elements in these samples has been studied in order to gain an impression of the leaching conditions at the time of formation, in the immediate vicinity of the relict. This distribution shows on a minor scale, what previously has been demonstrated in bulk for the whole deposit that leaching effects have not been uniform for the different elements, leading to a relative enrichment of calcium in the transition zone close to the unweathered parent rock. TEM and SEM observations revealed that halloysite and smectite are the dominant clay minerals of the transition zone, where kaolinite occurs only sporadically. These minerals apparently become unstable when alkalis and alkali earths are progres­sively leached, while kaolinite emerges as the pincipal clay mineral, and amphibole and plagioclase no longer remain in the residual mineral assemblage.
The sedimentology of Lower Palaeozoic black shales from the shallow wells Skelbro 1 and Billegrav 1, Bomholm, Denmark
Authors: Pedersen Gunver Krarup,
Published: August 2021

Previous studies of the Lower Palaeozoic shales on Bornholm have mainly been based on the outcrops along the streams. The outcrops provide data on the lateral continuity of the facies while the selection of (2-3 cm wide) cores for the present study focused the attention on the vertical sequence of facies. Cores of high quality were obtained and have been found to provide an excellent basis for a study of structures, sediment composition and diagenesis. In the outcrops of shale fossils are locally present in high numbers and such levels are also recognized in the cores.
Seven sedimentary facies, ranging from black mudshale to greyish mudstone and silt-streaked shale, are distinguished in the Middle Cambrian to lowermost Silurian shales. Gamma-ray logs were run in the two wells and a convincing correlation to the cored sequence can be demonstrated. Gamma-ray logs provide thus a good means of correlation to wells where no cores have been cut. The shales are all interpreted as deposited in an epicontinental sea due to their geological setting i.e. the association with shallow water carbonates (Andrarum Limestone and Komstad Limestone) and their stratigraphical position above the shelf to shoreface sandstones of the Lresa formation.
Three facies associations are distinguished: The mudshale association comprises black organic-rich shales which represent a low-energy anoxic depositional environment which prevailed in the Middle Cambrian to Lower Ordovician. The mudstone association is typical of the Middle and Upper Ordovician and represents a continuation of low-energy environments though mottling indicates that ventilation improved in certain periods. The siltshale association represents higher energy environments which were dominant in the lowermost Silurian.
A well defined Upper Ordovician CU sequence probably reflects the global eustatic fall in sea level caused by the extensive glaciation in Gondwanaland. In the late Silurian the average rate of deposition increased in response to the approaching Caledonian orogeny.
Hydrated iron sulphate occurrences at Navarana fjord, Central North Greenland
Authors: Jakobsen U. H.
Published: August 2021

Several occurrences of readily soluble hydrated sulphate minerals were found at Navarana Fjord in the northeastern part of Freuchen Land, central North Greenland.
The sulphate minerals are copiapite, fibroferrite, gypsum, rozenite, melanterite and roemerite. In addition, limonite and pyrite are found. The mineralization occurs in faults and is found with the minerals in the above succession with a yellow crust of copiapite at the surface down to roemerite at a depth of 1.35 m. The generation of these sulphate minerals are considered to be a result of oxidation and hydration of pyrite. The sulphates, otherwise unstable at surface conditions, are preserved because of the very cold and dry climate in the arctic region of North Greenland.
Reactivity of tetrazolo[1,5-a]pyrimidines in click chemistry and hydrogenation
Authors: Scapin Elisandra , Zimmer Geórgia C , Vieira Jean C B , Rodrigues Catarina A B , Afonso Carlos A M , Zanatta Nilo , Bonacorso Helio G , Frizzo Clarissa P , Martins Marcos A P
Published: August 2021

Herein, we explore the synthetic potential of tetrazolo[1,5-a]pyrimidines to obtain new pyrimidine derivatives by click chemistry and hydrogenation. Click chemistry reactions of the trifluoromethyltetrazolo[1,5-a]pyrimidines with terminal acetylenes produced unprecedented trifluoromethylated triazolylpyrimidines in excellent yields (84-98 %) in which one of them was active against all tested microorganisms, presenting moderate MIC values (62.5-15.62 mg/ml). Hydrogenation was carried out using Pd/C-H2 in MeOH under conventional, photochemical, and pressure (5 bar) conditions. The hydrogenation was an excellent method to obtain 2-amino-6-aryl-4-trifluoromethyl pyrimidines and/or 2-amino-6-aryl-4-trifluoro methyltetrahydro pyrimidines with a preference for 2-aminopyrimidine formation. The photochemical hydrogenation was the fastest and only pathway to reduce aryl-brominated substrate for the product without dehalogenation. Trifluoromethyl-substituted tetrazolo[1,5-a]pyrimidines reacted to 2-amino-6-aryl-4-trifluoromethyl pyrimidine formation in preference to the formation of the corresponding tethaydropyrimidines. However, the hydrogenation of non-trifluoromethylated tetrazolo[1,5-a]pyrimidines showed a preference for tetrahydropyrimidine formation.
Eficiencia técnica de los programas académicos de pregrado de la Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas
Authors: Balcázar César , Chávez Segundo , Castro Efraín
Published: August 2021

Medir la eficiencia en universidades tiene como finalidad evaluar el desarrollo de las mismas en función de indicadores que reflejen su fin, por lo que el objetivo del estudio fue evaluar la eficiencia técnica de los programas académicos de pregrado en la Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas. Se aplicó la metodología del análisis envolvente de datos (DEA) con orientación input; que permitió calcular la eficiencia técnica global, pura, y de escala. Para el desarrollo se consideró tres inputs (docentes, aulas y laboratorios para el desarrollo de las actividades) y cuatro outputs (proyectos logrados, estudiantes matriculados, egresados y autoría en publicaciones), se empleó el software R Studio (paquete deaR 1.2.1). La eficiencia técnica global y la eficiencia técnica pura determinaron 10 y 14 programas académicos respectivamente como eficientes; sin embargo, al comparar las tres eficiencias evaluadas, se determinó que diez programas académicos en pregrado demostraron ser eficientes en las tres eficiencias evaluadas pues no presentan brechas entre la eficiencia técnica global y la técnica pura evidenciando que presentan eficiencia de escala.
Reducing Ground-based Astrometric Errors with Gaia and Gaussian Processes
Authors: Fortino W. F. , Bernstein G. M. , Bernardinelli P. H. , Aguena M. , Allam S. , Annis J. , Bacon D. , Bechtol K. , Bhargava S. , Brooks D. , Burke D. L. , Carretero J. , Choi A. , Costanzi M. , Costa L. N. da , Pereira M. E. S. , De Vicente J. , Desai S. , Doel P. , Drlica-Wagner A. , Eckert K. , Eifler T. F. , Evrard A. E. , Ferrero I. , Frieman J. , García-Bellido J. , Gaztañaga E. , Gerdes D. W. , Gruendl R. A. , Gschwend J. , Gutierrez G. , Hartley W. G. , Hinton S. R. , Hollowood D. L. , Honscheid K. , James D. J. , Jarvis M. , Kent S. , Kuehn K. , Kuropatkin N. , Maia M. A. G. , Marshall J. L. , Menanteau F. , Miquel R. , Morgan R. , Myles J. , Ogando R. L. C. , Palmese A. , Paz-Chinchón F. , Plazas A. A. , Roodman A. , Rykoff E. S. , Sanchez E. , Santiago B. , Scarpine V. , Schubnell M. , Serrano S. , Sevilla-Noarbe I. , Smith M. , Suchyta E. , Tarle G. , To C. , Tucker D. L. , Varga T. N. , Walker A. R. , Weller J. , Wester W. ,   (The DES Collaboration)
Published: August 2021

Stochastic field distortions caused by atmospheric turbulence are a fundamental limitation to the astrometric accuracy of ground-based imaging. This distortion field is measurable at the locations of stars with accurate positions provided by the Gaia DR2 catalog; we develop the use of Gaussian process regression (GPR) to interpolate the distortion field to arbitrary locations in each exposure. We introduce an extension to standard GPR techniques that exploits the knowledge that the 2D distortion field is curl-free. Applied to several hundred 90 s exposures from the Dark Energy Survey as a test bed, we find that the GPR correction reduces the variance of the turbulent astrometric distortions ≈12× , on average, with better performance in denser regions of the Gaia catalog. The rms per-coordinate distortion in the riz bands is typically ≈7 mas before any correction and ≈2 mas after application of the GPR model. The GPR astrometric corrections are validated by the observation that their use reduces, from 10 to 5 mas rms, the residuals to an orbit fit to riz-band observations over 5 yr of the r = 18.5 trans-Neptunian object Eris. We also propose a GPR method, not yet implemented, for simultaneously estimating the turbulence fields and the 5D stellar solutions in a stack of overlapping exposures, which should yield further turbulence reductions in future deep surveys.
Modeling the Variable Polarization of ϵ Aurigae In and Out of Eclipse
Authors: Ignace Richard , Henson Gary , Neilson Hilding , Asbury William
Published: August 2021

The eclipsing binary ϵ Aur is unique in being a very-long-period binary involving an evolved, variable F star and a suspected B main-sequence star enshrouded in an opaque circumstellar disk. The geometrical arrangement is that the disk is viewed almost perfectly edge on, with the alignment leading to a partial eclipse of the F star. Despite a global observing campaign for the 2009–11 eclipse, there remain outstanding questions about the nature of the binary, its components, the disk, and the evolutionary state of the system. We analyze optical-band polarimetry in conjunction with broadband color variations to interpret brightness variations across the surface of the F star. We model this both during and after the 1982–84 eclipse for which an extensive and dense data set exists. We develop a model in terms of surface temperature variations characterized by a small global variation overlaid with a temperature variation described with low-order spherical harmonics. While not providing a detailed fit to the data set, our modeling captures the overall characterization of the color and polarimetric variability. In particular, we are able to recover the gross behavior of the polarimetric excursion in the Q–U plane as observed during eclipse of the F star when compared to posteclipse behavior.
Meterwavelength Single-pulse Polarimetric Emission Survey. V. Flux Density, Component Spectral Variation, and Emission States
Authors: Basu Rahul , Mitra Dipanjan , Melikidze George I.
Published: August 2021

We present the flux density measurements of the pulsars observed in the Meterwavelength Single-pulse Polarimetric Emission Survey. The average flux densities were estimated in 113 pulsars at two frequencies of 325 and 610 MHz using interferometric imaging. The average profile and single-pulse emission in each pulsar were calibrated using the estimated flux density. We have used the flux-calibrated average profile to study the variation of the spectral index across the emission beam in 21 pulsars where the core, inner cone, and the outer conal components could be clearly identified. The central core component showed a steeper increase in emission at the lower frequency compared with conal emission, with an average difference in spectral index δα
core-cone ∼ −0.7 between the core and the conal components in this frequency range. In contrast, the inner conal components had positive difference in their spectral index compared to the outer cones with average difference δα
in-out ∼ +0.3. The variation in the spectral index across the pulse window should provide valuable inputs for constraining the radio emission processes. The single-pulse emission showed the presence of emission mode changing in 12 pulsars, with three cases where the phenomenon is being reported for the first time. In addition, we have also detected enhanced emission for short durations or flaring, in parts or across the entire emission window in 14 pulsars. The sudden changes in the emission during mode changing, as well as these bursting states, are unrelated to the emission mechanism and suggest the presence of rapid and repetitive changes during the plasma generation process.
Coordination strategy for a dual-channel electricity supply chain with sustainability
Authors: Chen Wei , Jing Fuying , Zhong Li
Published: August 2021

This paper describes the construction of a dual-channel electricity supply chain, with an electricity generation enterprise as the leader and an electricity retail enterprise as the follower, examining sustainability and price decision-making, and formulates a coordination contract to improve electricity supply chain performance. The main results are as follows. Firstly, sensitivity to electricity sustainability contributes to increased electricity sustainability, electricity price, electricity demand, and supply chain enterprises' profits. Secondly, a centralized model is conducive to investment in more sustainable energy production. Finally, electricity supply chain system coordination can be realized by combining revenue-sharing and cost-sharing in a fixed compensation contract.
Coordinated optimization of production scheduling and maintenance activities with machine reliability deterioration
Authors: Hu Chaoming , Qian Xiaofei , Lu Shaojun , Liu Xinbao , Pardalos Panos M
Published: August 2021

In this paper, we investigate a coordinated optimization problem of production and maintenance where the machine reliability decreases with the use of the machine. Lower reliability means the machine is more likely to fail during the production stage. In the event of a machine failure, corrective maintenance (CM) of the machine is required, and the CM of the machine will cause a certain cost. Preventive maintenance (PM) can improve machine reliability and reduce machine failures during the production stage, but it will also cause a certain cost. To minimize the total maintenance cost, we must determine an appropriate PM plan to balance these two types of maintenance. In addition, the tardiness cost of jobs is also considered, which is affected not only by the processing sequence of jobs but also by the PM decision. The objective is to find the optimal job processing sequence and the optimal PM plan to minimize the total expected cost. To solve the proposed problem, an improved grey wolf optimizer (IGWO) algorithm is proposed. Experimental results show that the IGWO algorithm outperforms GA, VNS, TS, and standard GWO in optimization and computational stability.
Nonmonotone spectral gradient method based on memoryless symmetric rank-one update for large-scale unconstrained optimization
Authors: Sim Hong Seng , Chen Chuei Yee , Leong Wah June , Li Jiao
Published: August 2021

This paper proposes a nonmonotone spectral gradient method for solving large-scale unconstrained optimization problems. The spectral parameter is derived from the eigenvalues of an optimally sized memoryless symmetric rank-one matrix obtained under the measure defined as a ratio of the determinant of updating matrix over its largest eigenvalue. Coupled with a nonmonotone line search strategy where backtracking-type line search is applied selectively, the spectral parameter acts as a stepsize during iterations when no line search is performed and as a milder form of quasi-Newton update when backtracking line search is employed. Convergence properties of the proposed method are established for uniformly convex functions. Extensive numerical experiments are conducted and the results indicate that our proposed spectral gradient method outperforms some standard conjugate-gradient methods.
A Systematic Review of Clinical Decision Support Systems in Alzheimer’s Disease Domain
Authors: P.C. Sherimon , Sherimon Vinu , S.P. Preethii , Nair Rahul , Mathew Renchi
Published: August 2021

Dementia is one of the major public health issues faced by the world. Alzheimer’s disease (AD) is the most common form of dementia targeting old age groups around the world. It is a neurodegenerative condition with memory loss as its early symptom. Unfortunately, there is no cure for this disease currently. So various research in the medical and technical fields are being conducted to help people with Alzheimer’s. Many studies focus on early diagnosis of Alzheimer’s disease using clinical decision support system (CDSS) so that the progression of the disease can be slowed down to a great extent. In this context, we have undertaken a research to design and implement an ontology based Clinical decision support system for Alzheimer’s disease in Sultanate of Oman. A semantic knowledgebase (ontology) will be the core component of our Clinical decision support system. The objective of this research paper is two-fold (a) review the medical aspects of Alzheimer’s disease, and (b) review the available clinical decision support system based on ontology, robotics, and mobile applications in Alzheimer domain. Research articles published during 2011- 2020 in PubMed, Google scholar, Elsevier, SpringerLink and IEEE journals were reviewed. We found that there is various clinical decision support system which can aid physicians in suggesting diagnosis, and treatment of Alzheimer’s disease.
ON THE DIFFERENT VELOCITIES OF INLET BOUNDARY CONDITIONS FOR HUMAN ARM ANALYSIS OF ARTERIAL FLOW USING ONE-WAY FLUID–SOLID COUPLING
Authors: Wu Quanyu , Xiaojie Liu , Meijun Liu , Lingjiao Pan , Chunqi Qian
Published: August 2021

Simulations for blood hydrodynamic problems have been still largely incomplete despite years of research, especially for the inlet of boundary conditions that served as an essential part in computational fluid dynamics simulations of blood flow in human arteries. In this paper, the four different velocities of inlet boundary conditions were tested and compared in the human arm arterial model developed by us previously. Based on the selected points of nine key areas in the blood model,14 we analyzed the calculation results of pressure and shear stress distributions in detail. Our results show that they are changeable in different [Formula: see text] (different peak velocities of inlet boundary). The results further show that the static pressure of the aortic tree is higher than the static pressure of the branch, while the shear stress of the aortic tree is lower than the shear stress of the branch. On the other hand, the velocities changed in different [Formula: see text], the vessel walls of max total deformation appear in the middle radial obviously, compared with the equivalent and shear stress show at the entrance and bifurcations. In all, the simulation results of the brachial arteries provide the wall deformation, pressure and shear stress characteristics in different [Formula: see text], and offer a new strategy to study the two-way coupling of hemodynamics in the arm arterial model.
An overview of the health status of Syrian refugee children in a tertiary hospital in Turkey
Authors: Bucak Ibrahim Hakan , Almis Habip , Benli Samet , Turgut Mehmet
Published: August 2021

Objective: Migration is a problem affecting all family members, but particularly children. Child refugees are the highest risk group for the health systems of receiving countries. We investigated the health of 104 Syrian child refugees presenting to a tertiary hospital in Turkey. Settings and Design: A retrospective study was conducted in the pediatric clinic. Materials and Methods: The medical files of Syrian refugee children (0–18 years) presenting to Adiyaman University Hospital, Pediatric Clinic between 01 and 30 November 2015, were investigated. Demographic data, body measurements, and laboratory results obtained from patients' medical records were evaluated. Results: Mean age of patients was 53.5 ± 49.6 (2–198) months; 63 were male and 41 were female. Seventy-two patients (69.2%) were under 5 years of age. Weight in 20 patients (19.2%), height in 33 (31.7%), head circumference in 2 (1.9%), and body mass index in 7 (6.7%) were below the third percentile. All patients with body weight below the third percentile had chronic malnutrition. Anemia was present in 35 (50%) of the 70 patients for whom complete blood count data were available. Conclusion: Health workers involved with Syrian refugee children must consider the two preventable conditions; malnutrition and anemia.
Impact of Monovalent Rotavirus Vaccine on Rotavirus Hospitalizations among Children Younger Than 5 Years of Age in the Ouest and Artibonite Departments, Haiti, 2013 to 2019
Authors: Desormeaux Anne Marie , Burnett Eleanor , Joseph Gérard , Lucien Mentor Ali Ber , Aliabadi Negar , Pierre Manise , Dély Patrick , Pierre Katilla , Fitter David , Leshem Eyal , Tate Jacqueline E. , Bowen Michael D. , Esona Mathew , Gautier Jacqueline , Siné Florence , Katz Mark A. , Grant-Greene Yoran , Parashar Umesh D. , Patel Roopal , Boncy Jacques , Juin Stanley
Published: August 2021

Rotavirus is responsible for 26% of diarrheal deaths in Latin America and the Caribbean. Haiti introduced the monovalent rotavirus vaccine in April 2014. The objective of this analysis is to describe the impact of the rotavirus vaccine on hospitalizations among Haitian children younger than 5 years old during the first 5 years after introduction. This analysis includes all children with diarrhea who were enrolled as part of a sentinel surveillance system at two hospitals from May 2013 to April 2019. We compare the proportion of rotavirus-positive specimens in each post-vaccine introduction year to the pre-vaccine period. To account for the potential dilution of the proportion of rotavirus-positive specimens from a waning cholera outbreak, we also analyzed annual trends in the absolute number of positive stools, fit a two-component finite-mixture model to the negative specimens, and fit a negative binomial time series model to the pre-vaccine rotavirus-positive specimens to predict the number of rotavirus diarrhea hospital admissions in the absence of rotavirus vaccination. The overall percentage of rotavirus-positive specimens declined by 22% the first year after introduction, increased by 17% the second year, and declined by 33% to 50% the subsequent 3 years. All sensitivity analyses confirmed an overall decline. We observed a clear annual rotavirus seasonality before and after vaccine introduction, with the greatest activity in December through April, and a biennial pattern, with high sharp peaks and flatter longer periods of increased rotavirus activity in alternating years, consistent with suboptimal vaccination coverage. Overall, our study shows evidence that the introduction of the rotavirus vaccine reduced the burden of severe rotavirus diarrhea.
Investigating the Effect of Gypsum Powder on Chemical Constituents of Soil and Selected Crops, Adigudem, Tigray, Ethiopia
Authors: Hailu Berhe , Estifanos Samuel
Published: August 2021

This paper investigates the effects of gypsum powder from the gypsum plant in Adigudem on chemical properties of soil as well as the yield of two major crops, wheat (Triticum aestivum) and barley (Hordeum vulgare). Three mixes of 10kg of soil with 0%, 10%, 30%, and 50% proportion of gypsum powder were used for pot experiments under glasshouse conditions at Mekelle University. One bulk soil sample was collected from a spot at 4 km from the eastern side of the plant. The chemical concentration of major elements Ca, K, Na, Mg, and Mn, and trace elements, Cd, Zn, Cu, Pb, Cr, and Fe in soil and plant parts were determined using an Atomic absorption spectrometer as well as NO3, PO4 and SO4 using UV-spectrometer. The results suggest that the gypsum powder enhances metals and anion content in soil and in crop parts compared to the control sample. The chemical constituents in soil and crop parts showed negligible variation with increasing proportions of gypsum powder. Gypsum loaded Ca, SO4, Mn, and Pb onto the soil, which exhibited higher Mg, Cu, Mo, Cd, NO3, and PO4 but the comparable concentrations of Fe, K, Zn, and Cr in decreasing order. However, a direct relationship was noted in chemical constituent loadings along the pathway:  powder-soil-crop in a similar fashion in the three mixes. Factor analyses revealed that wheat parts have a higher accumulation of nutrients than the barley parts with higher content in its growth soil blends.  As an extension of this research, the in-situ investigation is recommended to assess the direct impact of the gypsum powder emitted over the soil and crops.
As Modificações Curriculares do Curso de Matemática da Universidade Estadual de Maringá, 1971-1996
Authors: Machado Suélen Rita Andrade , Trivizoli Lucieli Maria
Published: August 2021

Neste artigo descrevemos historicamente as modificações curriculares do curso de matemática da Universidade Estadual de Maringá (UEM), entre os anos 1971 a 1996, e identificamos nessas modificações possíveis saberes profissionais prescritos para a formação do futuro professor de matemática formado por este curso. Amparadas na pesquisa bibliográfica e documental de arquivos físicos inventariados do Departamento de Matemática da UEM, procedemos a análise documental. Evidenciamos que os primeiros vinte e cinco anos do curso foram marcados por quatro currículos prescritos em consonância ao contexto político e histórico do período. Por fim, identificamos que, com base nas modificações curriculares, as mudanças referentes às alterações de rubricas e inclusões de disciplinas nos quatro currículos ocorreram em direção a uma melhor caracterização do curso enquanto Licenciatura, por meio da incorporação de novos saberes profissionais docentes que possibilitavam a caracterização da formação do futuro professor de matemática oferecida por este curso no período histórico abordado.
Análise de Situações que Abordam Álgebra em Livros Didáticos dos Anos Iniciais
Authors: Silva João Alberto da , Alves Luana Leal , Andrade Rafael Penha
Published: August 2021

Este estudo é uma análise descritivo-analítica de uma coleção de livros didáticos de Matemática para os anos iniciais do Ensino Fundamental, a fim de investigar como as atividades para o desenvolvimento do Pensamento Algébrico são desenvolvidas, a partir do que preconiza a Base Nacional Comum Curricular. À luz da literatura atual sobre a caracterização das situações que envolvem Pensamento Algébrico, as atividades propostas nos livros didáticos foram analisadas com o intuito de verificar a diversidade de situações e o que tem se entendido como recurso didático para desenvolver este campo de conhecimento. Constatou-se que as cinco situações que abrangem o Pensamento Algébrico são contempladas na coleção analisada e estão em consonância com a Base Nacional Comum Curricular. Pôde-se identificar, ainda, que as atividades são variadas e apresentam preeminência do Pensamento Funcional, apontando a relevância de aprofundamento sobre as demais situações que envolvem o Pensamento Algébrico, pouco abordadas nos livros didáticos.
O Facebook como Alternativa de Trabalho na Formação Continuada de Professores que Ensinam Matemática
Authors: Ciríaco Klinger Teodoro , Silva Danielle Abreu , Garcia Mariany Fonseca
Published: August 2021

Analisamos o potencial das redes sociais como alternativa de formação docente. Neste contexto, para nós, o Facebook é instrumento promissor de compartilhamento de práticas profissionais na perspectiva de ampliação do repertório didático-pedagógico. Para tanto, o objeto de análise descrito reflete como este espaço virtual torna-se possibilidade de trabalho remoto no campo da formação continuada de professores que ensinam Matemática. O referencial teórico mobiliza constructos que regem a ação formativa, implementada entre novembro de 2020 e janeiro de 2021, que buscou constituir um grupo de estudos virtual centrado na discussão sobre alfabetização matemática na perspectiva do letramento. A metodologia, de natureza qualitativa, evidencia as interações virtuais por meio de atividades assíncronas. A partir da discussão empreendida, a literatura infantil apareceu como uma abordagem contextualizada nas aulas de Matemática e o narrar de experiências anteriores à pandemia da COVID-19, revelaram-se indicadores de ação futura das professoras em relação aos conteúdos matemáticos.
A Formação Matemática do Professor da Educação Básica: das Concepções Historicamente Dominantes às Possibilidades Alternativas Atuais
Authors: Moreira Plinio Cavalcanti , Ferreira Ana Cristina
Published: August 2021

Contamos uma história abreviada das ideias que influenciaram os desenhos curriculares dos cursos de Licenciatura em Matemática no Brasil desde 1930, e também daquelas que influenciaram as visões teóricas alternativas que foram se desenvolvendo ao longo desse período. Como parte importante dessa história de ideias, mencionamos três conceitos que se desenvolvem a partir de estudos publicados entre 1975 e 1987: o de Recontextualização (Bernstein), o de Transposição Didática (Chevallard) e o de Conhecimento Pedagógico do Conteúdo (Shulman). Sob o olhar segundo o qual construímos este texto, tais conceitos são fundamentais porque inspiraram, direta ou indiretamente, uma série de trabalhos que contribuíram para aprofundar a compreensão da natureza específica do conhecimento matemático requerido na prática docente escolar. Tal compreensão, ancorada também em estudos empíricos, levou, eventualmente, à construção de modelos teóricos que destacam, cada um sob sua perspectiva, as características essenciais do saber matemático relevante para a docência escolar.
Conceitualizando Tarefas Formativas para Desenvolver as Especificidades do Conhecimento Interpretativo e Especializado do Professor
Authors: Ribeiro Miguel , Almeida Alessandra , Mellone Maria
Published: August 2021

Considera-se o conhecimento do professor como sendo especializado, no que concerne tanto ao conhecimento do conteúdo como ao conhecimento pedagógico do conteúdo. Portanto, a formação de professores deverá contribuir para desenvolver o conteúdo dessas especificidades que aqui se consideram na perspectiva do Conhecimento Interpretativo e do Mathematics Teachers Specialized Knowledge – MTSK. Considerando a centralidade das tarefas preparadas e implementadas para as aprendizagens dos resolutores, justifica-se a necessidade de conceitualizar tarefas especificamente desenhadas para a formação de professores que se foquem em desenvolver as especificidades do conhecimento profissional para a prática matemática. Tendo por base as especificidades do conhecimento do professor, apresenta-se e discute-se a conceitualização do que se denomina Tarefa Formativa e os seus elementos constituintes a partir de um exemplo no âmbito da subtração e um conjunto de reflexões associadas ao papel do pesquisador e formador a fim de desenvolver as especificidades do Conhecimento.
Desconstruindo Tabus na Formação Matemática de Professores de Matemática
Authors: Oliveira Viviane Cristina Almada de , Linardi Patrícia Rosana , Viola dos Santos João Ricardo
Published: August 2021

Neste artigo apresentamos uma problematização da formação matemática de professores de Matemática, por meio de uma leitura de algumas ideias naturalizadas, as quais denominamos tabus: A Matemática; Quem sabe A Matemática do Matemático, também sabe a matemática do professor de Matemática; Os conteúdos. Muitas pesquisas na área de formação de professores são realizadas em tentativas de organizar discussões, deslocar focos, ou construir outros modos e formatos para conteúdos matemáticos, bem como para estratégias didático-pedagógicas, adequados à formação (matemática) de futuros professores. Nossa empreitada se afasta desses trabalhos, em uma direção de constituir dois aspectos centrais da prática política de um educador matemático: repertórios e leituras. Problematizamos, então, esses três tabus e apresentamos uma direção de construções de repertórios e leituras com professores de Matemática por meio de discussões, problematizações e produções com atividades baseadas em categorias do cotidiano. Nossa principal consideração é uma direção em construções de espaços de formações iniciais de diferentes educadores matemáticos em multiplicidades, travessias, tentativas, movimentos.
Marketing ambiental e pandemia
Authors: Kruse Bárbara Cristina , Ferreira Clarindo Maximillian , Kruse Marcos
Published: August 2021

A reprodução do capital é intrínseca ao sistema econômico atual. Partindo dessa premissa, a reificação da natureza se põe como forma de abastecimento dos ditames mercadológicos. A reinvenção dos brechós na contemporaneidade, se faz como estratégia de marketing ambiental, baseado na sustentabilidade, eis que se vendem peças de segunda mão. A ideia de consumir o que já existe conduz a uma suposta alternativa para a questão ambiental, além de que conta com aceitação das classes mais abastadas. Neste viés, este artigo tem como objetivo analisar sob o crivo crítico, os brechós ou second hand contemporâneos a partir das redes sociais. A metodologia se deu pela análise do discurso, conforme conceitos de Foucault. As bolsas de grife constituem o recorte temático, pois são os itens mais vendidos da espacialidade. O artigo também contextualiza o comércio com o momento atual vivenciado, da Pandemia do COVID-19. A importância do tema se dá tanto por ser uma nova prática social em uma espacialidade virtual, quanto pelo fato de ser um nicho comercial novo e em ascensão. Cabe assim, ao cientista social a tarefa de reflexão dessas transformações sociais e suas possíveis implicações ambientais.
Reflexões sobre o espaço urbano na pandemia, a partir do bairro Major Prates, em Montes Claros-MG
Authors: Fernandes Teixeira Mariana
Published: August 2021

O presente trabalho buscou analisar a formação do bairro Major Prates, na cidade de Montes Claros – MG, e suas características contemporâneas, levando em consideração seu caráter paradoxal, intensificado no contexto pandêmico. Por um lado, apresenta uma rede complexa de serviços e comércios, especulação imobiliária e disputas espaciais, por outro, uma articulação do urbano e do rural, revelando tradições e modos astuciosos de construir suas dinâmicas e sociabilidades. O estudo foi realizado a partir de uma combinação metodológica de pesquisa bibliográfica e observação direta. A primeira etapa procurou analisar a articulação do bairro com a cidade, em relação ao planejamento urbano, ressaltando o papel de subcentro e o caráter de resistência presente nas práticas socioespaciais dos citadinos. A observação direta ocorreu em horários e dias diferentes do mês de dezembro de dois mil e vinte, buscando identificar e analisar ações e comportamentos que demonstrem as estratégias de resistência realizadas no âmbito cotidiano, nos espaços que tem interface com a rua. Pretendeu-se, com isso, fomentar reflexões mais críticas sobre o espaço público, pois, além de desempenhar importantes papéis democráticos, é o palco no qual se realiza a vida urbana, o respiro da rotina, o encontro, e, principalmente, a diversidade.
Uma intervenção de 15 meses com exercício físico, melhora marcadores de saúde em mulheres obesas?
Authors: Alves Rafael Ribeiro , Silva Marcelo Henrique
Published: August 2021

Introdução: A crescente prevalência de obesidade e doenças cardiovasculares (DC) atenua a saúde da população, aumentando os gastos dos sistemas de saúde pública. A prática de exercício físico pode auxiliar na prevenção e/ou tratamento dessas doenças, sendo utilizada por programas do governo como o Núcleo de Apoio à Saúde da Família (NASF). Objetivo: Verificar os efeitos crônicos da prática de exercícios físicos do NASF em marcadores de obesidade e DC de sujeitos obesos. Métodos: Foi realizado um estudo transversal retrospectivo, composto pela análise de marcadores de obesidade e DC de 100 mulheres após 15 meses de treinamento em circuito. O teste de Friedman foi utilizado para comparações múltiplas do índice de massa corporal (IMC) e circunferência do abdome (CABD) entre os meses 1, 5, 10 e 15. Resultados: Foram encontradas diferenças significativas no IMC entre os meses 1, 5,10 e 15 (33,4±5,5, 31,6±5,5, 29,3±5,2 e 27,7±5,0, respectivamente. p<0,001) e CABD (101,0±1,4, 97,0±1,2, 92,0±1,0, e 87,0±1,0, respectivamente. p<0,001). Os resultados corroboram com a efetividade do programa NASF quando comparado a outros tipos de intervenção e duração, contudo, apesar dos resultados positivos sobre a obesidade e marcadores de DC, o protocolo carece de revisão afim de aumentar sua efetividade. Conclusão: Quinze semanas de exercícios físicos através do NASF melhoraram os marcadores de obesidade e DC de obesos. A expansão do programa ou similares podem auxiliar no tratamento ou prevenção dessas doenças.
Conjuntos divertidos. Propuesta psicomotora para el grado preescolar
Authors: Romero Díaz Celia , Escalona García Clara
Published: August 2021

En la Educación Preescolar varias son las áreas del conocimiento que influyen en el desarrollo armónico e integral de la personalidad del niño y la niña. Específicamente desde las Nociones Elementales de Matemática, fusionada con el área de Educación Física, se hace una propuesta de actividades con el objetivo de ejercitar el contenido relacionado con el trabajo de conjuntos. La propuesta surge por la necesidad de buscar vías que faciliten la asimilación y ejercitación del contenido de formación, comparación, y reconocimiento de conjuntos, de una manera más divertida, más amena, que tenga mejor acogida por los infantes y se potencie el desarrollo psicomotor de los mismos, fortaleciéndose las dimensiones: cognoscitiva, motora, afectiva y social. Por tanto, el elemento distintivo de la propuesta lo constituye la concepción de las actividades diseñadas en forma de juego, rompiéndose con lo tradicional en la enseñanza del contenido antes mencionado en el sexto año de vida o grado preescolar. La misma se ha puesto en práctica en la escuela “Víctor Mestre Sardiñas” del municipio de San José de las Lajas, con alto nivel de aceptación por maestras y principalmente los niños del grado preescolar.
Affirming Strength-Based Practices in Disability and Inclusion: A Shared Autoethnographic Study of the Experiences of a Teacher
Authors: Kewanian Alina , Creely Edwin , Southcott Jane
Published: August 2021

In this autoethnographic article we focus on the issues of “disability” and “inclusive education” and the challenges of being positive and affirming in this area of research and practice. As a teacher, I (Alina) continue to encounter regularly the dominant deficit view of “disability,” in spite of the extensive body of literature that advocates for the rights of people with disabilities as well as the benefits of inclusive education best built on strength-based thinking. The autoethnographic methodology allowed me to explore my experiences as an educator and reflect on specific events, presented through four vignettes that capture how my beliefs and values as an educator have formed over time. Throughout the article, I work closely with two academic colleagues (Ed and Jane), who become my critical friends, as I travel through this personal and professional journey that includes emotional reaction, reflection and academic analysis. I also engage with the emerging field of strength-based approaches to disability, as well as the importance of dialogue and justice, on an individual and professional level, with the aim of empowerment for students and teachers.
Experiences of an Exercise Program: Perspectives from Breast Cancer Survivors
Authors: Anisimowicz Yvonne , Rudy Lauren , Hamilton Ryan , McGowan Eric , Saunders Travis , Keats Melanie , Grandy Scott , Soucy Courtni , Bouchard Danielle
Published: August 2021

Few studies have examined how breast cancer survivors experience an individually tailored group exercise program designed to help mitigate physical and psychosocial challenges and improve health outcomes. This research used qualitative interviews to provide insight into what motivates breast cancer survivors to join an exercise program, what they hope to gain from exercise programs, the barriers they experience to participation, and their overall satisfaction with the program. Thirty-three breast cancer survivors from Atlantic Canada completed semi-structured, qualitative interviews following the completion of a twelve-week supervised exercise program, and thematic analysis was applied to transcripts of the interviews. Our findings suggest of the participants generally enrolled in the program, in hopes of increasing energy levels and muscular strength, most reported increases in both outcomes by the end of the program, and obstacles to participation included fatigue, poor physical health, and access challenges.
Comportamiento productivo en primer ciclo de gallinas rhode island rojas y plymouth rock barradas
Authors: Hernández-Sánchez Adrián , Gutiérrez-Vázquez Ernestina , Villalba-Sánchez Carlos Alberto , Pérez- Sánchez Rosa Elena , Ortiz-Rodríguez Ruy , Juárez-Caratachea Aureliano
Published: August 2021

RESUMEN

Se evaluó el comportamiento productivo de gallinas Rhode Island Rojas (RIR) y Plymouth Rock Barradas (PRB), durante el primer ciclo de postura, bajo las condiciones ambientales de la región del Altiplano en el estado de Michoacán, México. Para ello se utilizaron 26 gallinas doble propósito, distribuidas aleatoriamente en dos grupos: 13 RIR y 13 PRB de 20 semanas de edad, colocadas en jaulas individuales convencionales tipo batería; durante el período experimental (noviembre de 2019 a octubre de 2020), recibieron alimento comercial especial para gallinas en postura y agua, ambos ad libitum. Las variables bajo control fueron: peso vivo inicial (PVi), peso vivo final (PVf), consumo de alimento (CA), peso del huevo (PH), porcentaje de postura (%P), huevos por ciclo (HPC), masa de huevo (MH), índices morfométricos (IM), índices productivos (IP). Los resultados más relevantes en los genotipos RIR y PRB fueron: PVi y PVf, 2.019 vs. 2.160 kg y 2.105 vs. 2.300 kg respectivamente (P<0.05);  CA, RIR 124.1 vs. PRB 131.8 g (P<0.05); PH y %P para RIR y PRB: 59.4 vs. 61.2 g, 82.5 vs. 64.8 % (P<0.05) respectivamente; HPC y MH: 287.3 vs. 226.8 y 17.217 vs. 13.721 kg para RIR y PRB (P<0.0001) en su orden. En conclusión, las gallinas del genotipo Rhode Island Rojas mostraron mejor comportamiento productivo que sus contemporáneas Plymouth Rock Barradas.

 

ABSTRACT

The productive behavior of Rhode Island Red (RIR) and Plymouth Rock Barradas (PRB) hens was evaluated during the first laying cycle under the environmental conditions of the Altiplano region in the state of Michoacán, Mexico. For this purpose, 26 dual-purpose hens were used, randomly distributed in two groups: 13 RIR and 13 PRB of 20 weeks of age, placed in individual conventional battery type cages; during the experimental period (November 2019 to October 2020), they received special commercial feed for laying hens and water, both ad libitum. The variables under control were: initial live weight (PVi), final live weight (PVf), feed consumption (CA), egg weight (PH), laying percentage (%P), eggs per cycle (HPC), egg mass (MH), morphometric indices (IM), productive indices (IP). The most relevant results in RIR and PRB genotypes were: PVi and PVf, 2.019 vs. 2.160 kg and 2.105 vs. 2.300 kg respectively (P<0.05); CA, RIR 124.1 vs. PRB 131.8 g (P<0. 05); PH and %P for RIR and PRB: 59.4 vs. 61.2 g, 82.5 vs. 64.8 % (P<0.05) respectively; HPC and MH: 287.3 vs. 226.8 and 17.217 vs. 13.721 kg for RIR and PRB (P<0.0001) in their order. In conclusion, hens of the Rhode Island Red genotype showed better productive performance than their Plymouth Rock Barradas contemporaries.
Evaluation of Raw Material Inventory in Socks Home Industry Using Economic Order Quantity (EOQ)
Authors: Septiawan Haridhsah Hilmi , Panday Rorim
Published: August 2021

This study aims to evaluate purchasing raw materials and the Home Industry Socks by using the Economic Order Quantity (EOQ) method and the compare to the company's actual method. And to find out whether the EOQ method is effective to be applied to the company. The data used in this study are in the form of notes, reports, and company documentation for the period 2017, 2018, and 2019 provided by the owner through observation, interview, documentation, and literature study. Meanwhile, the usage data, raw material prices, and raw material purchase data are obtained from company records. The analysis technique in this study used EOQ formula, standard deviation, safety stock, Total Holding Cost, Total Ordering Cost, and Total Inventory Cost. The result of this research is that EOQ method is effective to be applied to socks home industry companies to control inventory more efficiently because it can minimize inventory costs.
Resistance Training Recommendations to Maximize Muscle Hypertrophy in an Athletic Population: Position Stand of the IUSCA
Authors: Schoenfeld Brad , Fisher James , Grgic Jozo , Haun Cody , Helms Eric , Phillips Stuart , Steele James , Vigotsky Andrew
Published: August 2021

Hypertrophy can be operationally defined as an increase in the axial cross-sectional area of a muscle fiber or whole muscle, and is due to increases in the size of pre-existing muscle fibers. Hypertrophy is a desired outcome in many sports. For some athletes, muscular bulk and, conceivably, the accompanying increase in strength/power, are desirable attributes for optimal performance. Moreover, bodybuilders and other physique athletes are judged in part on their muscular size, with placings predicated on the overall magnitude of lean mass. In some cases, even relatively small improvements in hypertrophy might be the difference between winning and losing in competition for these athletes. This position stand of leading experts in the field synthesizes the current body of research to provide guidelines for maximizing skeletal muscle hypertrophy in an athletic population. The recommendations represent a consensus of a consortium of experts in the field, based on the best available current evidence. Specific sections of the paper are devoted to elucidating the constructs of hypertrophy, reconciliation of acute vs long-term evidence, and the relationship between strength and hypertrophy to provide context to our recommendations.
Pola Aktivitas Enzim Lakase, Selulase, dan Xilanase Pada Masa Pertumbuhan Budidaya Jamur Tiram Putih [Pleurotus ostreatus (Jacq.) P. Kumm.]
Authors: Saskiawan Iwan , Widhyastuti Nunuk , Kasirah  , Sutardi Dodi
Published: August 2021

Recently, Pleurotus ostreatus has become the most cultivated edible mushroom in Indonesia because of the simple in cultivation. Pleurotus ostreatus easy to grow in a medium contained sawdust as a main substrate, with the addition of rice brand, corn flour, lime and gypsum. Mushroom production is bioconversion process which involves the activity of lignocellulolytic enzymes such as laccase, cellulase, and xylanase. The aim of this study was to reveal the pattern of laccase, cellulase, and xylanase activity during the growth of P. ostreatus on the sawdust medium. The results show that the highest laccase activity was obtained on the 15th day after spawn inoculation (ASI) of 0.66 Unit and decline sharply after the day of 45th ASI until the day of 75th ASI. Furthermore, the similar pattern with difference on the time incubation was obtained on the activity of cellulase and xylanase. It was decrease after the day 30th ASI. The highest activity of cellulase was 0.51 Unit on 30th day of ASI and decrease gradually until the day of 75th ASI. Furthermore, the highest activity of xylanase was on 30th day ASI of 0.34 Unit and decrease sharply until the day of 75th.