bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of mechanisms for ensuring the execution of tasks in project planning
Authors: Mulesa Oksana , Horvat Petro , Radivilova Tamara , Sabadosh Volodymyr , Baranovskyi Oleksii , Duran Sergii
Published: May 2023

This paper reports an analysis of aspects of the project planning stage. The object of research is the decision-making processes that take place at this stage. This work considers the problem of building a hierarchy of tasks, their distribution among performers, taking into account restrictions on financial costs and duration of project implementation.
Verbal and mathematical models of the task of constructing a hierarchy of tasks and other tasks that take place at the stage of project planning were constructed.
Such indicators of the project implementation process efficiency were introduced as the time, cost, and cost-time efficiency. In order to be able to apply these criteria, the tasks of estimating the minimum value of the duration of the project and its minimum required cost were considered. Appropriate methods have been developed to solve them.
The developed iterative method for assessing the minimum duration of project implementation is based on taking into account the possibility of simultaneous execution of various tasks. The method of estimating the minimum cost of the project is to build and solve the problem of Boolean programming.
The values obtained as a result of solving these problems form an «ideal point», approaching which is enabled by the developed iterative method of constructing a hierarchy of tasks based on the method of sequential concessions. This method makes it possible to devise options for management decisions to obtain valid solutions to the problem. According to them, the decision maker can introduce a concession on the value of one or both components of the «ideal point» or change the input data to the task.
The models and methods built can be used when planning projects in education, science, production, etc.
Formation of the system of integrated risk appetite management during it project implementation
Authors: Makarchuk Ivan , Fedulova Iryna , Mykolaichuk Iryna
Published: May 2023

The object of research is the risk appetite of an IT project. It is important for the implementation of an IT project to determine the critical values of indicators important for the activity, which predetermines the need to define and manage risk appetite. Risk appetite management in the implementation of an IT project directly affects its successful implementation and requires theoretical and methodological foundations for its consideration in the project management system. By establishing risk appetite, the project manager determines how much risk s/he is willing to take in order to achieve the key goals of the project. The definitions of "risk appetite", "risk tolerance", "risk appetite" in the implementation of IT projects have been clarified. It is determined that risk appetite should be considered as an integral set of IT project risk, which affects the achievement of the set goals: completion of the project in time, volume and budget that have been agreed. Risk tolerance defines acceptable limits for individual operational risks of the project. This will allow project participants to understand the limits of their authority and responsibility in risk management. A survey of project managers was conducted on their understanding of risk appetite and its use in project management. As a result, the most significant risks and the most used indicators and methods for establishing the risk appetite of IT projects were identified. This made it possible to generalize the experience of establishing and using risk appetite in IT projects. Also, based on the results of the study, an integrated risk appetite management system for the implementation of an IT project is proposed. This will allow balancing the permissible risk limits and the desired goals of its implementation during the implementation of the IT project. At the same time, an important place is occupied by taking into account the interests of stakeholders and their vision of the results, taking into account the risks. The findings reported here could make it possible to systematize risk management of IT projects and determine it as part of a single integrated project management process
Determination of the fatigue behavior of the composite Single-Stringer structure based on the quasi-static method
Authors: Shomran Ali Talib , Faisal Batool Mardan , Hussein Emad Kamil , Santos Thiago , Fatima Kies
Published: May 2023

In this investigation, the Mechanical Behavior of the composite Single-Stringer structure was subjected to numerical analysis in order to better understand its properties. As the primary material for the modeling process, the carbon-epoxy IM7/8552 with quasi-isotropic Layups has been utilized. The outcomes of the numerical analysis that were carried out on the structure while it was in its static state have been put into the structural tool that was developed by the ANSYS programme. The fundamental boundary conditions have been defined on the basis of the information that was received from the testing. Static forces with a combined magnitude of 13.7 kN are being applied to the composite Single-Stringer structure. Shear stresses, direction deformation, von mises stresses, and total deformation have all been shown to have an effect on a material's mechanical behaviour, and this effect has been demonstrated. The calculations indicate that there is a maximum amount of bending that can take place as a direct result of the load that is being applied, and that amount is equal to 0.0147. The maximum amount of bending that can take place as a direct result of the load that is being applied is equal to 0.0147. As a consequence of the application of 13.7 kN of pressure, the von Mises stress, which is also frequently referred to as comparable stresses, has reached 51.9 MPa. Shear stresses have been estimated in three distinct plans, and it was discovered that the shear stress that was applied to the XY plane achieved a maximum of 15 MPa, but the shear stress that was applied to the XZ plane reached a maximum of 9.8 MPa. This was found. Both aeroplanes were put through precisely the same amount of tension at the exact same time. At this time, the shear stress on the plane YZ has reached a level of 1.5 MPa.
Refinement of three-layer model of a damaged human body for the case of changing the moisture of the banding material
Authors: Ievlanov Maksym , Chumachenko Serhii , Fursenko Oleksandr , Cherepnov Ihor , Kyselov Volodymyr , Guida Oleksandr , Furtat Sergii
Published: May 2023

The object of study is a three-layer model of a damaged human body.
In the course of the study, it was found that the generally accepted three-layer model of a damaged human body is built, in particular, on the assumption that the characteristics of dressings remain unchanged over time. Therefore, the vast majority of modern research in the field of passive radiometry requires the removal of such materials from the human body during the measurement or considers their characteristics to be unchanged and insignificant. Questions of a possible change in the results of measuring the radiation of the human body due to the use of plaster casts of varying degrees of humidity remain almost unexplored.
As a result of the study, the mathematical three-layer model of the damaged human body was refined. An element was introduced into the model that describes the dependence of the attenuation of radio wave energy on the relative humidity of the plaster cast. The refined model makes it possible to increase the accuracy of measuring the temperature of the human body, taking into account the time of applying a plaster cast to it. Unlike the existing ones, the proposed model is based on an experimental study that simulates the measurement of the radiation of a human body with a plaster cast of different degrees of humidity. To refine the model, the obtained experimental data were processed by regression analysis methods.
The results of processing the experimental data made it possible to establish the specific type and value of the coefficients of the desired dependence.
The use of the obtained results of the study proves the possibility of remote non-invasive express diagnostics of the state of the human body in the presence of plaster-gauze bandages.
Providing such an opportunity allows disaster medicine workers to increase the ability to fulfill the so-called “golden hour rule”, as well as to clarify the requirements for a medical radiothermal mapping system
Construction of a simulation model for the transportation of perishable goods along variable routes
Authors: Anufriyeva Tetyana , Matsiuk Viacheslav , Shramenko Natalya , Ilchenko Nataliia , Pryimuk Olga , Lebid Viktoriia
Published: May 2023

The object of research is the system of organization of transportation of perishable goods. The study subject is the technological process of transportation of perishable goods by small shipments. The problem solved was a multicriteria optimization of the technological process of delivery of perishable goods by small shipments. The results are the built simulation model for the distribution of small consignments of perishable goods and the optimization according to the criterion of minimizing delivery time while limiting the rational use of available vehicles. To construct a simulation model, discrete-event and agent-based principles were used.
The model built combines the solution to the transport problem and the traveling salesman problem simultaneously with taking into account the stochastic duration of technological operations. When forming the distribution route, the model algorithm takes into account the minimum allowable batch size to the i-th destination, which allows each time to build a new unique route of the vehicle.
Unlike existing ones, the model constructed allows taking into account the peculiarities of the distribution network, the minimum consignment of cargo, and dynamically changing the route in accordance with the available cargo. Each time the cargo mass arrives at the logistics terminal, the condition of a sufficient quantity of goods intended for delivery to points of sale is checked. If the quantity of cargo sufficient for shipment is equal to the capacity of the car body, a new information message is generated on the availability of goods ready for shipment.
Scope and conditions of practical use of the obtained results include transport companies, retail chains, distribution logistics
Determination of fire protection distances during a tesla model s fire in a closed parking lot
Authors: Gavryliuk Andrii , Yakovchuk Roman , Chalyy Dmytro , Lemishko Mykhailo , Tur Nazarii
Published: May 2023

This study modelled an electric vehicle fire on the example of a Tesla Model S (USA) in a closed car park. Such fires pose an increased danger due to their rapid spread, the presence of a large number of vehicles, the release of toxic combustion products and heavy smoke. In fact, the rapid spread of a fire in a closed car park is caused by unreasonably small distances between vehicles. Thus, the purpose of the study was to determine the minimum fire protection distances due to an electric vehicle fire in a closed car park using the example of Tesla Model 3.
For this purpose, the objects and their physical characteristics were described, input and environmental parameters were set, and a mathematical model of the dynamics of fire development was formed. This made it possible to establish the minimum fire protection distance during the free development time of 610 s for an electric vehicle fire in a closed car park, which is 10 m along the flank and 6 m along the front. The difference in fire protection distances on the flank and front is explained by the design features of the electric vehicle. That is, the flank area of the flame will be larger than the front of the burning electric vehicle, and therefore the heat radiation power will also be greater. The actual heat radiation power is the key factor affecting fire protection distances.
The results of the study can be used in the design of various types of car parks and the safe placement of vehicles in them. Fire protection distances between cars in enclosed car parks can be taken into account by insurance companies when assessing the risk of damage to cars due to fires. And also by fire and rescue units involved in extinguishing such fires, to ensure the safety of rescuers
Harris Hawks optimization for ambulance vehicle routing in smart cities
Authors: Hussein Taha Darwassh Hanawy , Frikha Mondher , Rahebi Javad
Published: May 2023

The ambulance routing problem is one of the capacitated ambulance routing problem forms. It deals with injuries and their requests for saving. Therefore, the main aim of the ambulance routing problem is to determine the minimum (i.e., optimum) required distances of between:
1) accident places and the ambulance station;
2) the location of the nearest hospital and the accident places.
Although of the efforts proposed in the literature, determining the optimum route is crucial. Therefore, this article seeks to tackle ambulance vehicle routing in smart cities using Harris Hawks Optimization (HHO) algorithm. It attempts to take the victims as quickly as possible and confidently. Several engineering optimization problems confirm that HHO outperforms many well-known Swarm intelligence approaches. In our system, let’s use the node approach to produce a city map. Initially, the control station receives accident site information and sends it to the hospital and the ambulance. The HHO vehicle routing algorithm receives data from the driver; the data includes the location of the accident and the node position of the ambulance vehicle. Then, the driver’s shortest route to the accident scene by the HHO. The locations of the accident and hospital are updated by the driver once the car reaches the accident site. The fastest route (which results in the least travel time) to the hospital is then determined. The HHO can provide offline information for a potential combination of the coordinates of destination and source. Extensive simulation experiments demonstrated that the HHO can provide optimal solutions. Furthermore, performance evaluation experiments demonstrated the superiority of the HHO algorithm over its counterparts (SAODV, TVR, and TBM methods). Furthermore, for ten malicious nodes, the PDF of the algorithm was 0.91, which is higher than the counterparts
Tratamiento de drenajes ácidos de mina mediante filtros elaborados con polvo de acería
Authors: Pardavé-Livia Walter , Delvasto-Angarita Pedro , Serrano-Uribe Brayan Steven , Palacios Jhon Freddy
Published: May 2023

El tratamiento de drenajes ácidos de mina-DAM es necesario para mitigar los impactos ambientales generados en las industrias mineras, debido a que, un inadecuado e ineficiente sistema de tratamiento puede potencializar un riesgo tanto para la salud humana como para el medio ambiente. Con la finalidad de impulsar un método innovador y económico para el tratamiento de los DAM direccionado a la neutralización de su pH, se construyeron siete filtros utilizando polvo de acería y otros materiales, siguiendo la metodología de Design Thinking. Los resultados de la investigación mostraron una neutralización del pH de una solución ácida de HCl filtrada durante veinte días en los prototipos construidos. El resultado principal del estudio demostró que los filtros construidos con polvo de acería pueden neutralizar el pH de los drenajes ácidos de mina, consecuencia de la presencia de material calcáreo.
On the asymptotic behavior at infinity of one mapping class
Authors: Klishchuk Bogdan , Salimov Ruslan , Stefanchuk Mariia
Published: May 2023

We study the asymptotic behavior at infinity of ring Q-homeomorphisms with respect to p-modulus for p>n
Voltammetric sensor based on molecular imprinted polymer for lincomycin determination
Authors: Yarkaeva Yulia A. , Dymova Daria A. , Nazyrov Marat I. , Zagitova Liana R. , Maistrenko Valery N.
Published: May 2023

For the selective detection of the antibiotic lincomycin, we developed a voltammetric sensor based on a glassy carbon electrode modified with reduced graphene oxide and polyarylenephthalide containing diphenylenethio and diphenyleneoxide fragments in the main chain of the polymer in the 1:1 ratio with lincomycin molecular imprints obtained by phase inversion. Using FTIR spectroscopy, electrochemical impedance spectroscopy, cyclic and differential-pulse voltammetry, the electrochemical and analytical characteristics of the sensor were studied. The detection of lincomycin was carried out by differential pulse voltammetry. The linear concentration range was 2.5·10–7–5·10–4 M with a limit of detection of 6.8·10–8 M. It was shown that the presence of molecular imprints increases the sensitivity of the developed sensor in comparisons with a sensor with non-imprinted polymer by a factor of 3.05.
Development of an intervertebral disc prosthesis prototype for the canine cervical spine
Authors: Marinho Paulo Vinícius Tertuliano , Macedo Ana Paula , Rocha Thiago André Salvitti de Sá , Sampaio Cláudio Pereira de , Marinho Carolina Camargo Zani , Shimano Antônio Carlos , Arias Mônica Vicky Bahr
Published: May 2023

ABSTRACT: Cervical arthroplasty with disc prosthesis has been proposed as a treatment option for dogs with Cervical Spondylomyelopathy. The present study developed a novel vertebral disc prosthesis for dogs. Sixteen Functional Spinal Units (C5-C6) were collected from dog cadavers with body weights ranging between 25 and 35 kg, and their vertebral measurements were used to design a prosthetic disc. The sizing of the prosthesis was performed based on the averages of the measurements of width, height, and length of the vertebral bodies from C5-C6 of all specimens. The prosthesis was developed using the Rhinoceros 3D® and SolidWorks® programs, and 3D prototyping was carried out to define the best design. The developed prosthesis consisted of two independent parts that are fixed to the cranial and caudal vertebral bodies, in the intervertebral space, and fitted together by metal-to-metal surfaces capable of moving in the lateral, ventral, and dorsal directions. Each part of the prosthesis is angled in two portions: vertically, in the intervertebral space, and horizontally, in contact with the ventral surface of the vertebral bodies, both of which are fixed by means of monocortical locking screws. The design of the developed prototype allowed a good fit in the intervertebral space between C4-C5, C5-C6, and C6-C7.
Conhecimento de puérperas sobre a higiene corporal do recém-nascido
Authors: Silva Maria Paula Custódio , Fonseca Luciana Mara Monti , Ruiz Mariana Torreglosa , Araújo Gilberto Pereira de , Rocha Jesislei Bonolo do Amaral , Contim Divanice
Published: May 2023

Resumo Objetivos: identificar o conhecimento de puérperas assistidas em uma unidade de alojamento conjunto de um hospital de ensino acerca da higiene corporal do recém-nascido após receberem as orientações de rotina pela equipe de enfermagem. Métodos: estudo transversal, realizado com puérperas de um hospital de ensino do estado de Minas Gerais entre dezembro de 2018 e maio de 2019. Para coleta de dados foi construído e validado um instrumento seguindo três fases e empregou-se a estatística descritiva e a correlação linear de Spearman´s, com nível de confiança de 95% para análise do conhecimento. Resultados: participaram do estudo 207 puérperas, com média da idade de 27 ±6,3 anos. Conhecimentos inadequados foram observados, principalmente quanto à sequência da limpeza da face e couro cabeludo, produtos adequados e higiene do nariz, orelha e boca. O domínio “antes do banho” foi o que apresentou o maior percentual médio de questões acertadas (94,0%±10,1), incluiu cuidados com ambiente, temperatura e higiene íntima. Conclusão: a identificação de conhecimentos inadequados sobre a higiene corporal do recém-nascido suscita a necessidade de orientações constantes e mais efetivas, com uso de metodologias ativas com início no pré-natal.
Localização de armazéns agrícolas baseada em análise multicritério espacial
Authors: Souza Matheus Melo de , Oliveira Andréa Leda Ramos de , Souza Marlon Fernandes de
Published: May 2023

Resumo O agronegócio brasileiro avança em busca de tecnologias e novas áreas agricultáveis. Muitas vezes, a expansão das áreas agrícolas ocorre sem planejamento integrado com os atores do sistema logístico, especialmente em regiões de fronteira agrícola, como a região do MATOPIBA. O planejamento da localização de novos armazéns graneleiros contribui para a melhoria do processo de tomada de decisão para investimentos. Além disso, possibilita um processo virtuoso que permite a incorporação de aspectos para fomentar a intermodalidade e a preservação ambiental. Assim, o objetivo deste artigo é avaliar se uma combinação de critérios locacionais que considerem aspectos ambientais e de intermodalidade pode identificar regiões mais adequadas para a instalação de armazéns graneleiros do tipo subterminal. A metodologia utilizada agrega a Análise Hierárquica de Processos (AHP) e técnicas de geoprocessamento. A aplicação dos métodos permitiu classificar as regiões candidatas para a instalação de armazéns. Os resultados indicaram três grandes áreas adequadas para a armazenagem de grãos, que juntas representam 12% da área de estudo. A conclusão da pesquisa foi que, além de aspectos econômicos, a inclusão de fatores ambientais e de infraestrutura logística na análise espacial da localização promove uma rede de armazenagem mais sustentável, com armazéns bem posicionados e com menor competição.
Plano de Estudos do MST: uma análise genealógica no domínio curricular da Matemática
Authors: Sachs Línlya , Nogueira Amanda Araújo Coelho , Souza Luiza Gabriela Razêra de
Published: May 2023

Resumo No ano de 2013, foi publicado, pelo setor de Educação do Movimento dos Trabalhadores Rurais Sem Terra (MST) do estado do Paraná, o Plano de Estudos para os Anos Finais do Ensino Fundamental. Trata-se de uma proposta curricular destinada às escolas do campo em áreas de reforma agrária do estado (escolas itinerantes, de acampamentos, e escolas de assentamentos rurais). Com base nas táticas genealógicas de Foucault, o objetivo deste artigo é problematizar o que está posto no Plano de Estudos acerca do domínio curricular da Matemática. Nesse sentido, as teorizações em Foucault permitem entender como o conjunto de saberes autorizados, junto a um feixe de relações que o instauram, organicamente destitui e inferioriza as formas de saber que não passam pelo crivo do discurso científico. Para isso, a pesquisa dividiu-se em duas etapas: (i) uma análise dos temas matemáticos presentes no Plano de Estudos; e (ii) a realização de entrevistas com pessoas envolvidas na elaboração do Plano de Estudos. A conclusão é de que a relação estabelecida no Plano de Estudos entre os conteúdos matemáticos determinados por currículos oficiais e as porções da realidade ocorre de maneira ingênua e, por vezes, inconsistente, (re)produzindo a verdade da Matemática. Também foram evidenciados os meandros da elaboração, explicitando conflitos e mostrando que o sujeito é um efeito das relações de poder-saber.
O pensamento matemático mediante gestos e toques em tela no aplicativo Multibase em tablets
Authors: Freitas Rony , Bairral Marcelo Almeida
Published: May 2023

Resumo A introdução de tablets no ambiente escolar pode proporcionar novas formas de fazer matemática, pois eles permitem aos estudantes possibilidades de lidar com algo que pode ser considerado como uma expansão de seus corpos. Essa relação é tratada neste artigo no âmbito da cognição corporificada, que tem por pressuposto o fato de que o cérebro e o restante do corpo são conjuntamente responsáveis pelas operações fisiológicas denominadas como mente. Nessa perspectiva, esta pesquisa teve por objetivo analisar contribuições de movimentos epistêmicos para o desenvolvimento do pensamento aritmético por uma estudante do 2º ano do ensino fundamental, ao desenvolver atividades matemáticas inseridas no campo conceitual aditivo com o uso do aplicativo Multibase. A pesquisa é interpretativa e as análises são ancoradas na identificação, ilustração e finalidade dos gestos e toques em tela, considerando as formas características que podem ajudar a agir epistemicamente. Para a produção dos dados, foram utilizados registros filmados, gravações de tela do Multibase e registros realizados pelos próprios estudantes. Como resultado, foram mapeados e ilustrados tipos de toques em tela e identificadas algumas ações epistêmicas durante as interações com o Multibase que, de forma consciente (ou não), levaram a estudante a organizar o seu pensamento e a construir estratégias de raciocínio cada vez mais compreensíveis, com mais autonomia e reflexão.
Students' self-handicapping strategies in a mathematics course
Authors: Torisu Edmilson Minoru , Boruchovitch Evely
Published: May 2023

Abstract Self-handicapping strategies can be defined as individuals’ behaviors or statements, which happen before an important task is performed and work as an excuse to justify a likely poor performance. The use of these strategies can harm the academic performance of students at all levels. The current article presents a case study about the use of self-handicapping strategies carried out with twenty undergraduate Mathematics students from a Brazilian public university. Data collection was based on the application of a Likert-type scale and on a focus group conducted with students. Scale data were analyzed through descriptive statistics, whereas group discussions were subjected to qualitative analysis. Results have shown that most students do not significantly engage in self-handicapping behaviors. Difficulties to manage time and to prepare for academic activities, such as tests, were the reasons most often presented as justification for such an engagement. Data have also pointed out the need of rethinking the role played by teachers and by the atmosphere they promote in the classroom as factors that can contribute to the use, or not, of these strategies by students. Future research may help improving knowledge on these matters.
Argumentos del Estudiantado con Trastorno del Espectro Autista al Comparar Probabilidades Simples: un Estudio de Casos
Authors: García-Moya Melody , González-Ruiz Ignacio , Polo-Blanco Irene
Published: May 2023

Resumen El presente trabajo tiene como objetivo caracterizar el razonamiento probabilístico de cinco estudiantes de secundaria con diagnóstico de Trastorno del Espectro Autista (TEA), tras analizar los argumentos que emplean al comparar probabilidades simples. Se consideran, en el análisis, argumentos subjetivistas u objetivistas, así como distintos tipos de estrategias empleadas para la construcción de los segundos. Los estudiantes resolvieron seis ítems en línea con lo anterior, todos ellos diseñados con una estructura similar y en un contexto de bolas en cajas: entre las dos cajas posibles, debían elegir aquella en que la probabilidad del suceso sacar una bola negra era mayor Los resultados obtenidos advierten que los argumentos objetivistas determinan las elecciones de los cinco estudiantes y que, mayoritariamente, conducen a elecciones correctas. Además, en relación con los argumentos objetivistas se han reconocido distintas estrategias, siendo predominante la denominada comparación aditiva de casos favorables y desfavorables. Se han observado, también, ciertas dificultades por parte de algunos estudiantes en el reconocimiento de situaciones de equiprobabilidad. Se discuten posibles relaciones del desempeño observado con algunos rasgos cognitivos característicos de personas con TEA.
Professores em ação: (res)significando o ensino por meio da Modelagem Matemática
Authors: Tortola Emerson , Silva Karina Alessandra Pessoa da , Dalto Jader Otavio
Published: May 2023

Resumo Este artigo tem por objetivo apresentar resultados de uma pesquisa em que evidenciamos como professores em formação continuada (res)significam o modo como ensinam a partir da implementação de uma atividade de modelagem matemática. Subsidiados nas caracterizações de modelagem matemática como conteúdo e como veículo, debruçamo-nos nas práticas desenvolvidas por um grupo de dez professores que ensinam Matemática e que cursavam, em 2019, uma disciplina de Modelagem Matemática no contexto de um Mestrado Profissional em Ensino de Matemática. A análise das respostas a um questionário e dos relatórios escritos pelos professores descrevendo a prática desenvolvida foi inspirada na Teoria Fundamentada em Dados. A análise resultou em duas categorias que revelaram o modo como os professores ensinam por meio da modelagem matemática, conduzindo a uma (res)significação de suas práticas de ensino: prática docente diferente das habituais, que implicou o papel do professor de orientar e guiar os alunos na atividade; e prática que prima pelo envolvimento dos alunos, em termos das possibilidades oferecidas pela abordagem matemática de situações extramatemáticas.
Revisão sistemática de estudos sobre a autorregulação da aprendizagem da matemática no ensino superior
Authors: Semensato Michel Teston , Pilatti Luiz Alberto , Silva Francini Damiani e , Pinheiro Nilcéia Aparecida Maciel
Published: May 2023

Resumo Esta revisão sistemática buscou analisar os estudos sobre a autorregulação da aprendizagem (ARA) da matemática no ensino superior. Os métodos aplicados foram baseados na recomendação PRISMA. As bases de dados pesquisadas foram Scielo, ScienceDirect, Scopus e Web of Science, e os critérios de elegibilidade foram definidos a partir dos elementos população (estudantes do ensino superior), contexto (matemática) e conceito (ARA), sem restrição quanto ao período e idioma de publicação. Foram incluídos 28 estudos, de 2008 a 2021, dos quais quase a metade foi realizada nos Estados Unidos. Doze estudos realizaram intervenções com o objetivo de promover a ARA dos estudantes, e seus resultados apoiam a eficácia das intervenções na promoção da ARA da matemática no ensino superior. As demais pesquisas, de forma geral, procuraram analisar, no âmbito da ARA da matemática, os efeitos dos fatores motivacionais e emocionais, das estratégias de aprendizagem e da administração do estudo. Os resultados apontam que os fatores motivacionais, em especial a autoeficácia, são bons preditores para o desempenho acadêmico. Os estudos sobre a ARA no contexto específico da matemática no ensino superior estão em crescimento e ainda há muito a ser explorado, principalmente no Brasil. As limitações e as sugestões para pesquisas futuras são discutidas ao final da revisão.
Representaciones Semióticas de la Multiplicación y División en Libros de Texto de Educación Primaria
Authors: Chico Judit , Montes Miguel Ángel
Published: May 2023

Resumen En este artículo presentamos una propuesta para explorar los significados relativos a la multiplicación y división que se construyen en libros de texto de matemáticas de Educación Primaria. Para ello, realizamos un análisis multimodal de las tareas centradas en la multiplicación y división de dos propuestas editoriales con amplia difusión en España. El análisis realizado permite desarrollar una caracterización de las tareas en base a los significados potenciales de la multiplicación y división que se derivan del uso y coexistencia de los diferentes tipos de representaciones simbólicas, gráficas y verbales que se presentan y se demandan en las tareas. Los resultados apuntan un dominio de las representaciones simbólicas y un bajo uso de representaciones verbales en las tareas de multiplicación y división de las dos propuestas editoriales.
Utilizando Argumentações, Provas e Refutações em Sala de Aula de Geometria como Contribuições ao Desenvolvimento do Senso Crítico do Educando
Authors: Costa Valter Magalhães
Published: May 2023

Resumo Este artigo discute formas de contribuição para o aprimoramento do senso crítico dos educandos em sala de aula de Matemática. Especificamente, para fins de promoção dessa modalidade de pensamento chamada senso crítico, expusemos um grupo de alunos de 6º ano a um ambiente de argumentações e refutações, aplicando uma sequência de atividades didáticas que os conduzissem a demonstrar o seguinte resultado da Geometria Plana: “a soma dos ângulos internos de qualquer triângulo é 180°”. Assim, a seguir, usando este resultado, determinassem o valor da soma dos ângulos internos de um polígono qualquer por um processo de inferência lógica. Em relação às tarefas, que envolveram a explicitação de validações, os estudantes foram incentivados a fazer manipulações, produzir questionamentos e levantar hipóteses, visando construir conhecimentos e relações necessárias, tornando, dessa forma, os aprendizados significativos. Para fundamentar nossos trabalhos, apoiamo-nos na teoria do desenvolvimento do pensamento geométrico proposta por Van Hiele, bem como em Balacheff e nos seus trabalhos sobre argumentações e refutações para a construção de validações matemáticas. Para a análise dos resultados, embasamo-nos em Carraher e seus critérios para caracterizar um indivíduo como pensador crítico. Mostramos, assim, que o desenvolvimento do senso crítico pode ser favorecido por meio de um trabalho pedagógico que envolva os alunos na construção de validações geométricas.
Promoting cognitive health: a virtual group intervention for community-living older adults
Authors: Vasques Tamires Nicodemos , Almeida Maria Helena Morgani de , Toldrá Rosé Colom , Batista Marina Picazzio Perez
Published: May 2023

ABSTRACT Group cognitive interventions can promote a sense of self-efficacy to older adults. Due to restrictive social distancing measures in the COVID-19 pandemic, face-to-face interventions that aimed to promote cognitive health needed to be adapted to a virtual offering. Objectives: This study aimed to analyze the effects of promoting cognitive health in a virtual group intervention for community-living older adults. Methods: This is a mixed, prospective, and analytical study. Before and after the intervention, the tests were applied: Brief Cognitive Screening Battery (BCSB) and the Subjective Memory Complaints Questionnaire (MAC-Q). Data were collected at semi-structured interviews related to the adoption of memory strategies. Statistical tests were conducted for initial and final intragroup comparison. The qualitative data were assessed using thematic analysis. Results: A total of 14 participants concluded the intervention. With respect to mnemonic strategies, the most relevant for the qualifier “Did not use it before and started to do so after the group” were association (n=10; 71.4%) and dual-task inhibition (n=9; 64.3%). According to the tests, the intervention improved incidental, immediate, and delayed recall, as well as the perception of memory for “Remembering the name of the person they just met,” “Remembering the telephone number you use at least once a week,” “Remembering where they put an object,” “Remembering news from a magazine article or television program,” and “In general, how would you describe your memory now compared to when you were 40 years old.” Conclusions: The synchronous virtual group intervention was shown to be feasible for the elderly in the community who participated in the study.
Self-perception of cognitive sequels in post-COVID-19 individuals
Authors: Alves Emily Viega , Beber Bárbara Costa
Published: May 2023

ABSTRACT. COVID-19 is an infection, primarily respiratory, caused by the SARS-CoV-2, which can also affect the central nervous system, causing neuropsychological damage. There are studies describing post-COVID-19 cognitive deficits, but it is important to know this outcome in populations with different social, biological, and cultural characteristics. Objective: The aim of this study was to assess the self-perception of cognitive sequelae in post-COVID-19 individuals and identify whether there is a possible relationship between the outcome of the participants’ self-perception and sociodemographic and clinical data. Methods: This is a cross-sectional study, carried out through an online questionnaire on the Google Forms platform, in which sociodemographic data, general health data, clinical manifestations of COVID-19, and post-COVID-19 self-perception of the cognitive domains of memory, attention, language, and executive functions were collected. Results: The final sample consisted of 137 participants, and it was possible to identify that memory and attention were the domains with the highest impression of worsening post-COVID-19, followed by executive functions and language. In addition, it was identified that being female may be related to a worse self-perception of all cognitive functions and that having depression or other psychiatric diseases and obesity can significantly affect at least half of the cognitive domains evaluated. Conclusions: This study pointed to a post-COVID-19 cognitive worsening of the participants.
Itinerarios de reconstrucción de cuerpos de mujeres atacadas con agentes químicos en Bogotá, Colombia
Authors: Cian Laura Franco , Rivera-Largacha Silvia
Published: May 2023

Resumen El objetivo de este trabajo es analizar las experiencias de búsqueda y acceso a procedimientos para la reconstrucción física, social y psicológica de mujeres atacadas con agentes químicos en la ciudad de Bogotá. A partir un diseño etnográfico se recolectó información observacional y discursiva en escenarios de intervención formal y no formal sobre los cuerpos y se realizaron entrevistas en profundidad a sobrevivientes y a profesionales de la salud. Los datos fueron analizados a partir de un enfoque narrativo-crítico. Los hallazgos evidencian interpretaciones divergentes dentro de los sistemas cuidado de la salud sobre lo que constituye la reconstrucción de un cuerpo atacado con agentes químicos en un contexto marcado por grandes desigualdades en el acceso a la salud.
Primary Health Care in remote rural municipalities: context, organization, and access to integral care in the Brazilian National Health System
Authors: Fausto Márcia Cristina Rodrigues , Almeida Patty Fidelis de , Bousquat Aylene , Lima Juliana Gagno , Santos Adriano Maia dos , Seidl Helena , Mendonça Maria Helena Magalhães de , Cabral Lucas Manoel da Silva , Giovanella Ligia
Published: May 2023

Abstract Despite the socio-spatial diversity, remote rural locations have in common small villages dispersed over a vast territory, isolated populations, and long distances from urban centers. The objective of the study is to analyze the specificities of the organization and access to primary health care (PHC) in the Brazilian National Health System (SUS) in remote rural municipalities (MRR). To that end a study with a qualitative approach, based on a multiple case study in 27 MRR was carried out. Thematic content analysis of 211 semi-structured interviews with managers and health professionals and a triangulation of information to explore and recognize the forms of organization, strategies, and challenges for the access to health were performed. The results indicate that: the characteristics of remote rural contexts condition the provision of PHC; there are differences in the ways of offering health actions and greater gaps in care coverage in the most rarefied and remote areas of the municipalities; there are contradictions between national PHC funding and the characteristics of territories marked by sparcely populated areas and long distances; and the shortage of the workforce is a common challenge among the cities studied. It is, thus, necessary to consider the territorial, social, and access characteristics to health services to propose public policies that meet the needs of the MRR.
Factors associated with covid-19 deaths in the city of Recife, Pernambuco, Brazil, 2020: a cross-sectional study with “Notifique Aqui” system data
Authors: Souza Ísis Vanessa Silva de , Holanda Eliane Rolim de , Barros Mariana Boulitreau Siqueira Campos
Published: May 2023

Abstract Objective: to analyze the clinical conditions and sociodemographic characteristics associated with covid-19 deaths in the first year of the pandemic in the city of Recife, Pernambuco, Brazil, 2020. Methods: this was a cross-sectional study with covid-19-induced severe acute respiratory syndrome cases recorded in 2020 via the “Notifique Aqui” (Report Here) electronic system of the Pernambuco Center for Strategic Information on Health Surveillance. Association between death and sociodemographic and clinical variables was analyzed. Prevalence ratios (PR) with 95% confidence intervals (95%CI) were calculated using adjusted Poisson regression. Results: the prevalence of death was 28.4% (2,833 cases; 95%CI 27.51;29.28). The associated factors were male sex (PR = 1.05; 95%CI 1.01;1.08), age ≥ 60 years (PR = 0.76; 95%CI 0.72;0.79), dyspnea (PR = 1.06; 95%CI 1.02;1.10), respiratory distress (PR = 1.06; 95%CI 1.03;1.09), oxygen saturation < 95% (PR = 1.08; 95%CI 1.04;1.11) and chronic diseases. Conclusion: covid-19 deaths were more prevalent among male, older adults, and people with pre-existing health problems, these being priority groups for combating the pandemic.
Effect of phosphate ester grinding aids on cement grinding and water-reducing performance
Authors: Hu Lin , Yang Fan , Huang Yijia , Yang Kaixuan , Li Binbin
Published: May 2023

Phosphate ester polymers were prepared from phosphate ester monomers for the first time and their effects as cement grinding aids and water-reducing performance were studied. Fourier-transform infrared (FTIR) spectroscopy and tests for standard viscosity, setting time, mortar fluidity, mortar compressive strength were conducted. The results showed that hydroxyethyl dibutyl phosphate reduced the residues of 45 μm and 80 μm grinding sieves by 68.67% and 98.67%, respectively. Compared with triethanolamine, the grinding effect of hydroxyethyl dibutyl phosphate was not only better but also the optimal mixing amount was less (only 0.167%). For the same amount of grinder, the grinding time was shortened by 30% and, for the same grinding time, the grinding output was increased by at least 20%. The polymer grinding aids significantly improved the fluidity of cement paste (by 40.06%), meaning the water-reduction rate of cement mortar could reach over 20%. The experimental results show that, as a new generation of grinding aids, phosphate esters not only have a significant grinding effect but also have high molecular designability, which will significantly enrich the grinding aids market and effectively promote energy conservation and emissions reductions in the grinding process.
Centrifuge and theoretical study of the seismic response of anchored steel sheet pile walls in dry sand
Authors: Fusco Alessando , Conti Riccardo , Viggiani Giulia M. B. , Madabhushi Gopal S. P. , Prüm Cécile
Published: May 2023

Displacement-based approaches have been proven to be effective for the seismic design of gravity retaining structures. However, application of these methods to embedded flexible walls, such as anchored steel sheet pile (ASSP) walls, is still an open issue, as the factors affecting the accumulation of permanent displacements of these systems are not fully understood. This paper presents the results of four dynamic centrifuge tests on small-scale models of ASSP walls in uniform dry sand. The experimental results showed that ASSP walls can experience different failure mechanisms depending on their geometry and on the magnitude of accumulated displacements. During the earthquake, the system exhibits an overall increase of its seismic capacity, caused by: (a) progressive mobilisation of the soil passive strength; (b) sand densification; (c) rotation of the walls; and (d) reduction of the retained height. Accounting for these effects in pseudo-static limit equilibrium solutions improved the predictions of both the critical failure mechanism and the maximum internal forces in the structural members. Moreover, it allowed development of an efficient analytical tool for the prediction of the seismic permanent displacements of these systems, based on Newmark's sliding block approach.
Towards Developing a Science-Language Learning Programme for the Equality of Sustainable Learning Opportunities for Young Children
Authors: Tlali Moeketsi
Published: May 2023

It is imperative to offer equal quality learning opportunities for young children at both deprived and advantaged early childhood development centres (ECDCs). To this end, substantive involvement by young children in the envisioned quality learning that should take place, even in constrained contexts, warrants thoughtful exploration. Consequently, this study investigated the development of young children's communication and mathematical skills to explore the affordances of the South African National Curriculum Framework for children from birth to 4 years in relation to incorporating science concepts. Our proposition for privileging science concepts relevant to early learning and development areas of the curriculum framework was premised on the urge to respond to young children's current learning needs in order to make learning in the future sustainable. We adopted a participatory action research design, undergirded by principles of intra-relationality, to develop an assessment and activity plan consistent with our proposition. Using the principles of free attitude interviews and brainstorming as techniques, rich qualitative data were generated during meetings, workshops, and reflection sessions with study team member participants. The team made the following observations and findings: the transition of young children from ECD to Grade R is marred by challenges that make the learning of young children beyond ECD unsustainable because of the absence of continual communication between the ECD and Grade R teachers and, to some extent, between the parents (home) and the ECDC. Through the knowledge gained from regular participatory action-oriented meetings, workshops, and reflections, the study contributed to the development of participants and benefited the ECDC involved in this study in several respects.