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Planejamento e gestão de obras civis em ambiente industrial : estudo de caso de reforma de coqueria por meio do PMBOK®.
No full textPrograma de Pós-Graduação em Engenharia das Construções. Departamento de Engenharia Civil, Escola de Minas, Universidade Federal de Ouro Preto.A presente dissertação aborda a aplicação da metodologia PMBOK® na gestão de projetos para o desenvolvimento de uma obra civil industrial, com o objetivo de corrigir danos causados pela operação de uma coqueria em uma usina siderúrgica localizada no estado de Minas Gerais. Dada a natureza contínua da operação da coqueria, as intervenções e manutenções representam um desafio significativo. Assim, o foco deste estudo foi investigar e sistematizar os processos de planejamento e execução do projeto do pavimento médio, assegurando o cumprimento dos prazos e custos estabelecidos no escopo.Para alcançar esse objetivo, a pesquisa adotou uma metodologia de estudo de caso, incluindo coleta de dados por meio de entrevistas, questionários, levantamentos de campo e análise documental. Os questionários revelaram uma adesão de 55% à metodologia do Guia PMBOK®, e todas as respostas são baseadas no que o PMBOK® preconiza.No entanto, nesta dissertação, o foco principal foi uma abordagem qualitativa, que leva em conta a entrega dentro do prazo, o atendimento ao custo do projeto e a satisfação do cliente final. Esses fatores são essenciais para avaliar o sucesso de uma obra, pois refletem a qualidade da execução e a percepção dos stakeholders.This dissertation addresses the application of the PMBOK® methodology in project management for the development of an industrial civil construction project, with the objective of correcting damage caused by the operation of a coking plant in a steel mill located in the state of Minas Gerais. Given the continuous nature of the coking plant operation, interventions and maintenance represent a significant challenge. Thus, the focus of this study was to investigate and systematize the planning and execution processes of the average pavement project, ensuring compliance with the deadlines and costs established in the scope.To achieve this objective, the research adopted a case study methodology, including data collection through interviews, questionnaires, field surveys and document analysis. The questionnaires revealed a 55% adherence to the PMBOK® Guide methodology, and all responses are based on what the PMBOK® recommends.However, in this dissertation, the main focus was a qualitative approach, which takes into account on-time delivery, meeting the project cost and end customer satisfaction. These are essential factors for evaluating the success of a project, as they reflect the quality of execution and the perception of stakeholders
Case study combined with the drug-generating theme : contributions to the construction of knowledge in chemistry and biology.
No full textFreire propõe a organização curricular baseada em temas geradores que repre- sentam as contradições sociais vivenciadas pelos educandos e a realidade a ser problematizada. Delizoicov (1990) sistematizou a investigação temática em cinco etapas: 1a - levantamento preliminar da realidade; 2a - análise das situações e escolha das codificações; 3a - círculo de investigação temática; 4a - redução te- mática; e 5a - desenvolvimento do programa em sala de aula. Desta forma, este trabalho tem por objetivo analisar as implicações no processo de aprendizagem dos conteúdos de Química e Biologia por meio da utilização de temas geradores e metodologias de ensino diferenciadas, como o estudo de caso. Para emersão do tema gerador, realizamos entrevistas, visitas e pesquisas em fontes educaci- onais e governamentais, coletando dados de aproximadamente 150 membros da comunidade escolar, incluindo alunos do ensino médio, pais, professores, funcionários e moradores do entorno da escola. Dos temas iniciais (violência, segurança, saúde, drogas, saneamento básico e infraestrutura), "Drogas" emer- giu como o mais significativo. Junto aos professores de Química e Biologia, se- lecionamos os conteúdos necessários para interpretar e compreender esse tema, bem como seus impactos sociais na comunidade investigada. Este artigo analisa um estudo de caso aplicado em turmas do terceiro ano do ensino médio de uma escola pública. O estudo de caso intitulado "Meu amigo Antônio" foi uti- lizado para contextualizar os conteúdos de Química e Biologia, destacando a relação entre essas disciplinas e o tema do álcool, a droga que foi o foco deste trabalho. Os dados coletados foram analisados, por meio da análise de conte- údo, conforme preconizado por Bardin (1994). Os resultados desta pesquisa de- monstram que a utilização do tema gerador na estrutura do programa escolar favorece o ensino de Química e Biologia, promovendo uma formação mais crítica e cidadã dos estudantes. A educação baseada em temas geradores e a aplica- ção de estudos de caso contribuem para a compreensão de como esses méto- dos podem favorecer a aprendizagem, estimulando a reflexão crítica e a conexão do conhecimento com a realidade dos estudantes.Freire proposes a curriculum organization based on generative themes that rep- resent the social contradictions experienced by students and the reality to be problematized. Delizoicov (1990) systematized thematic investigation into five stages: 1st - preliminary survey of reality; 2nd - analysis of situations and selec- tion of codifications; 3rd - thematic investigation circle; 4th - thematic reduction; and 5th - program development in the classroom. Thus, this work aims to analyze the implications of the learning process of Chemistry and Biology content using generative themes and differentiated teaching methodologies, such as case stud- ies. For the emergence of the generative theme, we conducted interviews, visits, and research in educational and governmental sources, collecting data from ap- proximately 150 members of the school community, including high school stu- dents, parents, teachers, staff, and residents around the school. Among the initial themes (violence, security, health, drugs, basic sanitation, and infrastructure), "Drugs" emerged as the most significant. Together with Chemistry and Biology teachers, we selected the necessary content to interpret and understand this theme, as well as its social impacts on the investigated community. This article analyzes a case study applied to third-year high school classes in a public school. The case study titled "My Friend Antonio" was used to contextualize the content of Chemistry and Biology, highlighting the relationship between these subjects and the theme of alcohol, the drug that was the focus of this work. The collected data were analyzed through content analysis, as proposed by Bardin (1994). The results of this research demonstrate that the use of the generative theme in the school program structure favors the teaching of Chemistry and Biology, promot- ing a more critical and civic education for students. Education based on genera- tive themes and the application of case studies contribute to understanding how these methods can enhance learning, stimulating critical reflection and the con- nection of knowledge with the students' reality
Dos altares às universidades : a recepção das obras de Edith Stein no Brasil (1948-2018).
No full textPrograma de Pós-Graduação em História. Departamento de História, Instituto de Ciências Humanas e Sociais, Universidade Federal de Ouro Preto.O presente trabalho tem como objetivo apresentar a história do movimento intelectual relacionado à recepção brasileira da filósofa e fenomenóloga Edith Stein. Para isso, realizamos um mapeamento detalhado da recepção da produção intelectual de Stein, abordando esse movimento em dois períodos distintos. O primeiro período, que se estende de 1948 a 1986, começa com as primeiras publicações destinadas a introduzir Edith Stein ao público brasileiro, concentrando-se principalmente em uma perspectiva biográfica. Neste contexto, destacam- se as contribuições de intelectuais católicos leigos, como o Dr. Alceu Amoroso Lima e Hedwig Michel, cujos escritos sobre Stein foram publicados na revista A Ordem. Ainda nesse período, merece atenção a biografia escrita por Maria Anna Nabuco, bem como a peça teatral Edith Stein na câmara de gás, traduzida por Manuel Bandeira. Durante essas décadas, a figura de Edith Stein foi amplamente percebida como a de uma judia convertida ao catolicismo, visão que permaneceu predominante até a década de 1980, com poucas alterações significativas. A canonização de Edith Stein por João Paulo II, no entanto, trouxe um impulso considerável à sua recepção no Brasil. Nesse contexto, a figura religiosa de Stein passou a ser um ponto central de interesse, desencadeando disputas biográficas entre grupos de judeus, cristãos e feministas, que buscavam diferentes formas de interpretar sua trajetória de vida e suas contribuições. O segundo período inicia-se em 1987, marcado pela defesa da tese de doutorado de Irmã Jacinta Turolo Garcia, intitulada Edith Stein e a formação da pessoa humana, na Pontifícia Universidade Urbaniana de Roma. Jacinta Turolo Garcia desempenhou um papel fundamental nesse novo momento como reitora da Universidade do Sagrado Coração (USC) e como figura de destaque na editora EDUSC, promovendo as primeiras publicações e traduções de obras relacionadas a Edith Stein no Brasil. Essa fase também contou com a significativa contribuição da professora Angela Ales Bello, que desde 2011 vem apresentando Edith Stein ao público brasileiro por meio de palestras e conferências. Esse segundo período é caracterizado pela consolidação da recepção acadêmica de Edith Stein no Brasil. Os Simpósios Filosóficos Internacionais dedicados à sua obra ganharam importância, assim como a tradução de textos fundamentais, como Vida de uma família judia e outros escritos autobiográficos. Este momento não apenas amplia o alcance da obra de Stein no Brasil, mas também marca sua inserção definitiva no cenário acadêmico nacional, consolidando sua presença como uma das figuras centrais da fenomenologia e da filosofia personalista.This study aims to present the history of the intellectual movement related to the Brazilian reception of the philosopher and phenomenologist Edith Stein. To achieve this, we conducted a detailed mapping of the reception of Stein's intellectual production, addressing this movement in two distinct periods. The first period, spanning from 1948 to 1986, begins with the first publications aimed at introducing Edith Stein to the Brazilian public, primarily focusing on a biographical perspective. In this context, the contributions of lay Catholic intellectuals such as Dr. Alceu Amoroso Lima and Hedwig Michel stand out, with their writings about Stein published in the journal A Ordem. Also noteworthy from this period are the biography written by Maria Anna Nabuco and the play Edith Stein in the Gas Chamber, translated by Manuel Bandeira. During these decades, Edith Stein was largely perceived as a Jewish woman who had converted to Catholicism, a perception that remained dominant until the 1980s, with few significant changes. However, the canonization of Edith Stein by John Paul II brought substantial momentum to her reception in Brazil. In this context, Stein's religious figure became a central focus of interest, sparking biographical disputes among Jewish, Christian, and feminist groups, each seeking different interpretations of her life journey and contributions. The second period begins in 1987, marked by the defense of the doctoral dissertation of Sister Jacinta Turolo Garcia, titled Edith Stein and the Formation of the Human Person, at the Pontifical Urban University in Rome. Sister Jacinta Turolo Garcia played a pivotal role in this new phase as the rector of the Sacred Heart University (USC) and a prominent figure at the EDUSC publishing house, promoting the first publications and translations of works related to Edith Stein in Brazil. This phase also benefited significantly from the contributions of Professor Angela Ales Bello, who, since 2011, has been introducing Edith Stein to Brazilian audiences through lectures and conferences. This second period is characterized by the consolidation of the academic reception of Edith Stein in Brazil. The International Philosophical Symposia dedicated to her work gained importance, as did the translation of key texts such as Life in a Jewish Family and Other Autobiographical Writings. This moment not only expanded the reach of Stein's work in Brazil but also marked her definitive integration into the national academic landscape, solidifying her presence as a central figure in phenomenology and personalist philosophy
Ruthenium(II) complexes of curcumin and β-diketone derivatives : effect of structural modifications on their cytotoxicity.
No full textRuthenium(II) complexes (Ru1–Ru3) with the general formula
[Ru(O-O)(PPh3)2(bipy)]PF6, bearing two triphenylphosphine
(PPh3), bipyridine (bipy) and a series of natural and synthetic
β-diketones (O,O) ligands were synthesized and characterized
using various analytical techniques. The interaction between
the complexes and calf thymus DNA (CT-DNA) was
investigated and demonstrated a weak interaction. The
cytotoxicity of the complexes was investigated against breast
cancer cells (MDA-MB-231 and MCF-7), lung cancer cells
(A549), cisplatin-resistant ovarian cancer cells (A2780cis), as
well as non-tumour lung (MRC-5) and non-tumour breast
(MCF-10A) cell lines. All complexes exhibited cytotoxic
activity against all the cell lines studied, with half maximal
inhibitory concentration (IC50) values ranging from 0.39 to
13 μM. Notably, the three complexes demonstrated selectivity
against the A2780cis cell line, with IC50 ranging from 0.39 to
0.82 μM. Among them, Ru2 exhibited the highest cytotoxicity,
with an IC50 value of 0.39 μM. Consequently, this new
class of complexes shows good selectivity towards cisplatin-
resistant ovarian cancer cells and it is promising for further
investigation as anti-cancer agents
The toxicity of superparamagnetic iron oxide nanoparticles induced on the testicular cells : in vitro study.
No full textSuperparamagnetic iron oxide nanoparticles (SPIONs) have gained significant attention in biomedical research
due to their potential applications. However, little is known about their impact and toxicity on testicular cells. To
address this issue, we conducted an in vitro study using primary mouse testicular cells, testis fragments, and
sperm to investigate the cytotoxic effects of sodium citrate-coated SPIONs (Cit_SPIONs). Herein, we synthesized
and physiochemically characterized the Cit_SPIONs and observed that the sodium citrate diminished the size and
improved the stability of nanoparticles in solution during the experimental time. The sodium citrate (measured
by thermogravimetry) was biocompatible with testicular cells at the used concentration (3%). Despite these
favorable physicochemical properties, the in vitro experiments demonstrated the cytotoxicity of Cit_SPIONs,
particularly towards testicular somatic cells and sperm cells. Transmission electron microscopy analysis
confirmed that Leydig cells preferentially internalized Cit_SPIONs in the organotypic culture system, which
resulted in alterations in their cytoplasmic size. Additionally, we found that Cit_SPIONs exposure had detrimental
effects on various parameters of sperm cells, including motility, viability, DNA integrity, mitochondrial activity,
lipid peroxidation (LPO), and ROS production. Our findings suggest that testicular somatic cells and sperm cells
are highly sensitive and vulnerable to Cit_SPIONs and induced oxidative stress. This study emphasizes the po
tential toxicity of SPIONs, indicating significant threats to the male reproductive system. Our findings highlight
the need for detailed development of iron oxide nanoparticles to enhance reproductive nanosafety
Unlocking the potential of MOF-biochar composites : advanced functional materials for adsorption, catalysis, and energy storage.
No full textComposites formed by metal-organic frameworks (MOFs) and carbonaceous materials have gained prominence
as advanced functional materials due to their high surface area, high porosity, resistance, optical properties, and
stability. While composites based on activated carbon, graphene oxide, and carbon nanotubes have been
explored for over a decade, the use of biochars in forming such composites has only recently emerged as a
possibility. Despite this, and considering their highly adjustable properties, composites formed by MOFs and
biochars have already been explored in several applications, including adsorption and catalytic degradation of
contaminants, gas adsorption, electrochemical energy storage, electromagnetic wave absorption, and Knoeve-
nagel condensation reaction catalysis. In view of these aspects and given the rapid advancements of this field,
this review explores the synthesis, properties, and applications of composites formed by MOFs and biochars
(MOF-BC composites). Additionally, it discusses the challenges and opportunities for advancing this field, serving
as a significant reference to guide future research in the area
Ações e práticas pedagógicas inclusivas na EJA no contexto da educação especial : razões de um atendimento diferenciado na APAE de Ouro Preto.
No full textPrograma de Pós-Graduação em Educação. Departamento de Educação, Instituto de Ciências Humanas Sociais, Universidade Federal de Ouro Preto.A Educação de Jovens e Adultos (EJA) e a Educação Especial (EE) guardam diversas similaridades entre si quando observadas as suas singularidades de maneira pormenorizada. Tanto a EJA quanto a EE têm conquistado melhorias na sua operacionalização e em suas diretrizes muito recentemente. Isso se deve, sobretudo, à Constituição Federal de 1988 e à Lei de Diretrizes e Bases da Educação Nacional que estabeleceram os direitos dos sujeitos que são público dessas modalidades, assegurando o direito ao atendimento educacional especializado e condições educacionais que atendam suas particularidades e assegurem suas condições de acesso e permanência. Além disso, ambas as modalidades atendem um público diversificado e enfrentam dificuldades para a promoção de uma educação ao longo da vida, o que fez necessário compreender a interface entre a EJA e a EE, bem como dos desafios desse público-alvo na escola comum de Educação Básica. O presente trabalho é resultante de um estudo de caso realizado na Escola de Educação Especial Hélio Harmendanni, APAE-OP, no qual investigamos as práticas e metodologias pedagógicas desenvolvidas pelo corpo docente e como essas ações contribuem para o desenvolvimento da pessoa com deficiência intelectual e múltipla na EJA. Igualmente, as pessoas com necessidades especiais matriculadas na dita EJA comum sofrem um processo de invisibilidade, uma vez que o processo pedagógico empreendido na modalidade nem sempre contempla suas necessidades e interesses. Ante a esse processo de invisibilidade, os alunos da EJA recorrem às instituições privadas de atendimento às pessoas com necessidades especiais para que possam dar continuidade ao seu processo formativo, sendo a APAE uma das mais famosas instituições no acolhimento desses indivíduos. O estudo de caso realizado, por meio de entrevistas semiestruturadas, permitiu observar um conjunto de ações pedagógicas relevantes que são desenvolvidas na APAE-OP e que contribuem para o acolhimento e desenvolvimento de aprendizagem dos alunos da EJA com deficiência. Essas questões foram analisadas e desenvolvidas a partir das teorias de Lev Vygotsky e Paulo Freire, entendendo a relevância do papel social para o aluno da EJA, em especial o aluno com deficiência intelectual e múltipla. A pesquisa também permitiu refletir sobre o conceito de inclusão e os limites que o dito conceito carrega após as inúmeras políticas públicas construídas para a Educação Especial nos últimos anos.Youth and Adult Education (EJA) and Special Education (EE) have several similarities when their singularities are observed in detail. Both EJA and EE have achieved improvements in their operationalization and guidelines very recently. This is mainly due to the Federal Constitution of 1988 and the Law of Guidelines and Bases of National Education, which established the rights of the subjects who are the target audience of these modalities, ensuring the right to specialized educational services and educational conditions that meet their particularities and ensure their conditions of access and permanence. In addition, both modalities serve a diverse audience and face difficulties in promoting lifelong education, which made it necessary to understand the interface between EJA and EE, as well as the challenges of this target audience in the regular Basic Education school. This paper is the result of a case study conducted at the Hélio Harmendanni Special Education School, APAE- OP, in which we investigated the pedagogical practices and methodologies developed by the teaching staff and how these actions contribute to the development of people with intellectual and multiple disabilities in EJA. Likewise, people with special needs enrolled in the so-called regular EJA suffer a process of invisibility, since the pedagogical process undertaken in this modality does not always take into account their needs and interests. Faced with this process of invisibility, EJA students turn to private institutions that serve people with special needs so that they can continue their educational process, with APAE being one of the most famous institutions in welcoming these individuals. The case study conducted through semi- structured interviews allowed us to observe a set of relevant pedagogical actions that are developed at APAE-OP and that contribute to the welcoming and development of learning of EJA students with disabilities. These issues were analyzed and debated based on the theories of Lev Vygotsky and Paulo Freire, understanding the relevance of the social role for the EJA student, especially students with intellectual and multiple disabilities. The research also allowed us to reflect on the concept of inclusion and the limits that this concept carries after the numerous public policies created for Special Education in recent years
Hydrogen generation via NaBH4 hydrolysis over cobalt-modified niobium oxide catalysts.
No full textThe increasing concentration of CO2 in the atmosphere, primarily driven by fossil fuel combustion, is a major
contributor to global warming and one of the most pressing environmental challenges of the 21st century. In
response, the development of sustainable energy technologies, such as hydrogen (H2) production, has become
crucial in the global transition to a low-carbon economy. In this study, we explored the catalytic activity of
cobalt-modified niobium-based catalysts for hydrogen generation through the hydrolysis of NaBH4. The catalysts
were characterized using XRD, FTIR, XPS, SEM-EDX, and N2 adsorption-desorption. XRD analysis revealed that
the synthesized Nb2O5 (Nb2O5 Synt.) and Nb2O5/Co (Nb2O5/Co Synt.) exhibited amorphous structures, while the
commercial Nb2O5 (Nb2O5 Com.) and its Co-modified composite displayed orthorhombic phases. The Nb2O5/Co
Synt. catalyst achieved a surface area of 33.1 m2
/g, significantly surpassing that of the commercial Nb2O5. The
Nb2O5/Co Synt. catalyst exhibited superior catalytic activity, yielding 250 mL of hydrogen in 60 min, in contrast
to other catalysts that showed no activity under identical conditions. This enhanced activity was attributed to the
presence of surface hydroxyl groups and metallic Co nanoparticles, following the Langmuir-Hinshelwood
bimolecular mechanism. Temperature was identified as a critical factor in the H2 production rate, with a
calculated activation energy of 11.37 kJ/mol. Moreover, the Nb2O5/Co Synt. catalyst demonstrated excellent
reusability, maintaining stable performance after multiple reaction cycles, highlighting its potential for sus
tainable hydrogen production
Physical exercise prescription for health and quality of life in areas affected by dam construction.
No full textUma das atividades mobilizadoras da melhoria e obtenção do bem-estar, e principalmente da saúde, é o
exercício físico prescrito por um profissional de Educação Física. Nessa perspectiva, foi realizado um
programa de extensão com o intuito de proporcionar a prática de exercícios físicos à população de Antônio
Pereira. A divulgação através de parcerias com a UBS e o CRAS alcançou um grupo de 16 indivíduos com
diversas comorbidades, entre elas: hipertensão, dislipidemia, diabetes, reumatismo e problemas articulares
para as práticas de treinamento funcional próximas ao CRAS. Os moradores que aderiram à prática não
somente buscaram o benefício motor, mas também a socialização que as atividades físicas proporcionam.
Assim, o objetivo deste trabalho é apresentar o processo de construção e realização do projeto de Corrida e
caminhada como forma de promoção da saúde e efetivação da Educação Física na saúde coletiva dentro do
programa “De Mãos Dadas com Antônio Pereira”. Esperamos a continuidade do programa, buscando alcançar
mais pessoas e melhores resultados, com avaliações físicas periódicas, para que assim, seja possível
relacionar os benefícios da atividade física com a saúde física e mental das pessoas do território, e a
sedimentação da Educação Física na saúde coletiva.One of the mobilizing activities for improving and achieving well-being, particularly health, is physical exercise
prescribed by a Physical Education professional. In this perspective, a study was conducted to find the best
space for practice that would be easily accessible to the interested population in the district of Antônio Pereira,
a territory affected by mining activities. Promotion through partnerships with the Basic Health Unit (UBS) and
the Social Assistance Reference Center (CRAS) reached a group of 16 individuals with various comorbidities,
including hypertension, dyslipidemia, diabetes, rheumatism, and joint problems, for functional training
practices near the CRAS. Residents who embraced the practice sought not only motor benefits but also the
socialization that physical activities provide. Furthermore, participants reported improvements in physical
health throughout the project. However, we hope for the continuity of the program, aiming to reach more people
and achieve better results, with periodic physical assessments. This will enable us to correlate the benefits of
physical activity with the physical and mental health of the territory's residents, and the integration of Physical
Education into collective health
Influence of Mn precursor on pre-pyrolysis modification of sugarcane bagasse biochar for enhanced removal of 2,4-dichlorophenoxyacetic acid from aqueous solutions : experimental and theoretical insights.
No full textBiochars impregnated with Mn oxides were produced using sugarcane bagasse (SB) modified with MnCl2 (Mn(II)- BC) or KMnO4 (Mn(VII)-BC) for the removal of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) through adsorption. The composites were structurally and functionally characterized by various techniques, revealing an irregular surface with oxide microspheres. Elemental analyses showed the presence of manganese and oxygen in distinct proportions. X-ray diffraction identified crystalline planes of MnO and Mn3O4, as well as the amorphous carbon phase. Infrared spectroscopy confirmed Mn bonded to oxygen, and its influence on BC graphitization was corroborated by Raman spectroscopy. Thermogravimetry highlighted the oxides’ influence on thermal stability, while the total number of acidic and basic functions revealed notable differences in surface chemistry. Adsorptive removal of 2,4 D was optimized under conditions of pH 2.00, dosage of 2 g L 1, and particle size smaller than 100 mesh. Adsorption equilibrium was attained after 24 and 12 hours for Mn(II)-BC and Mn(VII)-BC, respectively, with experimental maximum capacities of 36.78 and 57.19 mg g 1. Freundlich and Sips isotherms fit better for Mn(II)-BC and Mn(VII)-BC, respectively, while Elovich and pseudo-second-order kinetic models were suitable. Density Functional Theory (DFT) calculations confirm that, with decreasing pH, hydrogen bonding takes place. At higher pH,binding with Mn3O4 suggests efficacy in Mn(II)-BC composite adsorption, not observed in Mn(VII)-BC due to an additional oxide, differentiating available sites. Despite Mn leaching challenges, postacid exposure reuse showed favorable removal percentages, indicating potential for reutilization. These findings confirm the suitability of the synthesized composites as adsorbents for the remediation of water contaminated with 2,4-D