http://repositorio.jesuita.org.br/handle/UNISINOS/1674 Mestrado Fri, 17 Apr 2026 10:22:01 GMT 2026-04-17T10:22:01Z http://repositorio.jesuita.org.br/handle/UNISINOS/13986 Microfabrication of electrode-integrated liver-on-achip for in-vitro cell culture monitoring Dalló, Luíse Cambruzzi The liver is a vital organ responsible for crucial metabolic functions, drug metabolism, detoxification, and the production of proteins necessary for maintaining homeostasis in the body. However, studying liver physiology and drug metabolism has traditionally relied on animal models and two-dimensional (2D) cell cultures, which often fail to recapitulate the complex and dynamic nature accurately. Liver-on-a-chip is an emerging technology that aims to replicate the structure and functions of the human liver in a miniature and controlled in vitro platform. This study presents the fabrication and characterization of a liver-on-a-chip microfluidic device integrating microelectrodes for real-time cell culture monitoring. The device mimics the hepatic microenvironment by incorporating microchannels connected through endothelial-like capillaries, facilitating controlled nutrient exchange and waste removal under continuous perfusion conditions. The fabrication process involved three main stages: electrode fabrication, mold fabrication, and microchannel manufacturing. HepG2 cells were cultured within the microfluidic device under dynamic perfusion, demonstrating progressive adhesion, proliferation, and viability over multiple days. Impedance spectroscopy was employed to quantitatively assess cell behavior, with measurements indicating stable electrode performance and reliable monitoring of cellular dynamics. The results confirmed that the liver-on-a-chip device successfully supports long-term cell culture while providing real-time electrical characterization. This makes it a promising platform for hepatic disease modeling and pharmaceutical testing. Fri, 04 Apr 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13986 2025-04-04T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13985 Aplicação da sistemática Shop Floor Management nas atividades de validação de itens novos de uma fabricante de carrocerias de ônibus Araújo, Fernando Constante de The competitive dimension of quality remains one of the main requirements of the market, where companies have certified their processes and structured areas dedicated to carrying out inspection and quality control activities. Management systems such as Lean Manufacturing are now being adopted by companies to improve quality, reduce lead time and reduce costs. In this scenario, the action research method presents the opportunity to implement a visual management model based on Lean Manufacturing practices in quality activities. The management model defined was Shop Floor Management (SFM), its main characteristic is holistic management, which in turn aims to solve problems and develop the people involved in the process, by presenting the results through KPIs and correcting problems and daily corrections regarding issues of occupational safety, quality, delivery, costs and people's motivation, thus systematizing the continuous improvement of processes and products. The research is applied to the activities of the validation processes of new items in the quality sector of a bus body manufacturer, and the effects on the indicators of the delivery dimension are observed, referring to the average time for validation of new items, approval of new items, average time for warranty of items from suppliers and the accuracy index of the warehouses under the responsibility of quality. A comparison of the before and after results in the delivery issues, as well as the scope in the motivational issues of those involved is also presented, validating the concept of a holistic mechanism for the daily management of factory floor activities. Mon, 14 Apr 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13985 2025-04-14T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13984 Identificação e análise de riscos à saúde e segurança do trabalhador da construção civil utilizando sensoriamento vestível (wearable) Travi, Nadine Schorr This research demonstrated that the use of wearable sensing technologies can enhance the way health and safety risks are identified in construction. From the analysis of two distinct construction sites — a retrofit project in Porto Alegre and a conventional building site in Portão — 58 occupational risks were mapped, six of which were classified as critical, mainly in physically demanding activities such as the removal of ceramic coatings and plaster. The workers’ profile revealed young professionals, with low levels of schooling and limited experience, exposed to conditions that go beyond physical effort: 25% showed symptoms of Common Mental Disorder (CMD), associated with psychosocial factors such as productivity pressure, task insecurity, and intense heat. Environmental and physiological monitoring highlighted the direct influence of climate (external temperature) and tasks on vital parameters, with increases in heart rate and blood pressure during critical activities. These findings reinforce the importance of scheduled breaks and task redistribution as effective protective measures. The study also advanced by proposing a predictive model capable of explaining 75% of risk variation, showing that wearable sensors can support real-time decisionmaking and anticipate situations of physical and mental illness. In summary, the results reveal that the integration of technology, environmental indicators, and attention to psychosocial aspects not only broadens the understanding of risks but also points to concrete pathways for creating safer, healthier, and more humane construction sites. Wed, 10 Sep 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13984 2025-09-10T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13983 Análise da influência das características do substrato e da ausência de ancoragem no reforço de vigas submetidas ao cisalhamento utilizando manta de fibra de carbono Betencourt, Josiani Fatima The present study investigates the use of carbon fiber sheets, without anchorage, for the shear strengthening of reinforced concrete beams, thereby assessing the impact caused by potential bonding failures of the sheet. Carbon fiber sheets exhibit characteristics such as high tensile strength, corrosion resistance, durability, and ease of installation, making them an excellent alternative for structural strengthening, especially in cases of architectural constraints. To develop this research, a literature review was conducted in order to deepen the understanding of fiber-reinforced polymers, their properties for use as structural reinforcement, as well as design and detailing techniques. The experimental phase consisted of the fabrication of four batches of reinforced concrete beams, with three beams in each batch, all with the same longitudinal and transverse reinforcement configuration. The first batch was used as a reference, while the others were strengthened: one batch was bonded by the Quartzolit team, and the remaining ones had intentional bonding defects introduced, in order to evaluate their performance in comparison with the others. The test carried out was a three-point bending test with an offset load, designed to induce shear failure. Deformation, displacements, and crack patterns were also analyzed in each tested element. The results showed that beams strengthened with intentional bonding defects achieved values up to 101.55% higher than the average of the reference beams, whereas other elements, despite showing increased strength, yielded lower results. Furthermore, changes in crack patterns and failure modes were observed when compared to the reference beams, where all failures occurred by diagonal tension. Based on the results obtained, the importance of proper preparation of the beam to be strengthened, as well as the use of anchorage devices, became evident, since some failures were caused by sheet debonding along the edges. Nevertheless, this study highlighted the efficiency of carbon fiber sheets as shear reinforcement, confirming their effectiveness among the materials available in civil engineering. Mon, 22 Sep 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13983 2025-09-22T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13982 Modelagem numérica de infiltração de água: dois sistemas de cobertura final de aterro sanitário no Vale do Rio dos Sinos Silva, Carlos Alexandre Quadros da Numerical calculation methods have become much more efficient, making their application in problem-solving increasingly widespread. User-friendly interfaces make model configuration much easier and more intuitive, while the increase in computer speed can solve difficult problems in a matter of minutes. A series of computational models for estimating rainfall processes and their impact on the performance of landfill cover systems have become valuable tools in contemporary times, especially for evaluating the final cover layer of compacted soil. Among them, one of the most notable is HYDRUS-1D, a software based on the Finite Element Method that simulates the one-dimensional movement of water, heat and solute in variably saturated porous media for various limit conditions, including precipitation and evaporation. HYDRUS 1D was used to model the water balance in final cover layers of sanitary landfills in the Vale do Rio dos Sinos, using laboratory data on granulometry, Atterberg limits, compaction, permeability and suction of soils collected in São Leopoldo and Esteio (RS), and adjusting meteorological series (1991–2020) of precipitation, temperatures, relative humidity, evapotranspiration, insolation and wind by multiple linear regression (adjusted R² ≈0.895) for the months of highest and lowest rainfall; the performance of conventional and evapotranspiratory cover systems was compared in a one-dimensional regime, finding that the evapotranspiratory cover significantly reduces water percolation by keeping the soil in an unsaturated condition for longer; It is concluded that the integration of characterization tests, statistical analysis and numerical simulation provides precise subsidies for the dimensioning and selection of materials, contributing to the minimization of environmental impacts associated with water inlet the landfill. Thu, 31 Jul 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13982 2025-07-31T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13936 Intensidade do azul em anéis de crescimento da conífera subtropical Araucaria angustifolia (Bertol.) Kuntze Nunes, Ânderson Juliano This study investigated the feasibility of Araucaria angustifolia as a dendroclimatic proxy in subtropical regions, focusing on tree-ring width (RW) and maximum latewood blue intensity (MXBI). The analyses revealed synchronicity between RW and MXBI chronologies, reflecting eco-physiological responses to climate variability. RW showed a positive correlation with precipitation from April to June of the previous year, suggesting that higher rainfall in the preceding autumn favors wider rings. In contrast, MXBI correlated with the mean temperature for the same period of the current year, indicating that higher temperatures enhance latewood lignification, resulting in greater optical intensity. These patterns highlight distinct climatic responses for each proxy, reflecting different growth cycle phases. MXBI was more strongly related to thermal variables, particularly mean autumn temperature, than to hydrological variables such as precipitation and the Palmer Drought Severity Index (PDSI), whose lack of correlation suggests that high water availability at the study site mitigates drought impacts on tree growth. The moderate correlation between MXBI and RW (r = 0.45, p = 0.002) indicates an interaction between anatomical and optical parameters in recording climate conditions. The EPS for MXBI was 0.745, lower than that of RW (0.894), demonstrating RW's greater robustness as a climate proxy. However, combining both proxies proved effective in reconstructing autumn temperatures. MXBI’s ability to reflect local thermal conditions during autumn is valuable for understanding climate changes in subtropical regions. Future studies should integrate multiple proxies and expand analyses to other ecological contexts to improve climate reconstructions and support conservation strategies. Thu, 19 Dec 2024 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13936 2024-12-19T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13914 Método para simulação e análise de VTCDs em instalações elétricas industriais Ayres, Ingridt Cezar This work presents a simplified methodology for the analysis of Short-Duration Voltage Variations (SDVV) in Group A consumer units, with an emphasis on industrial facilities composed of motor loads. The proposal is based on the modeling of inrush current profiles of three-phase induction motors, obtained experimentally and incorporated into the OpenDSS simulation environment through LoadShape curves. The approach considers the technical criteria established in Module 8 of PRODIST, with the proposal to include a new severity region representing the ideal operating range. To evaluate the methodology, simulated scenarios were developed with different electrical configurations, and the voltage disturbances were quantified using the Impact Factor (FI) and the Base Impact Factor (FIBASE) indicators. The results obtained demonstrate the applicability of the methodology for preventive analysis of SDVVs, enabling technical diagnostics in the design or operation phase of the plant and contributing to compliance with the regulatory limits for electric power quality. Tue, 17 Jun 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13914 2025-06-17T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13913 Metodologia para determinação da capacidade de hospedagem de sistemas fotovoltaicos para consumidor livre Souza, Deivis Marques de The addition of Photovoltaic Systems (PS) to the internal networks of consumers inserted in the Free Contracting Environment (FCE), called free consumers, brings with it a set of challenges related to the planning and integration of such systems. Among these challenges, the present work aims to propose a methodology capable of determining the Hosting Capacity (HC) of PS for free consumers of the self-producer type, without injecting surplus energy produced into the distributor's network, without exceeding limits of predefined technical parameters such as overvoltage (V), overcurrent (I) and reverse power flow (RPF), and obtaining results with low data processing times, through the use of Visual Basic for Application (VBA) and OpenDSS tools. Currently, there are numerous works containing PS of HC analysis methods aimed at distribution networks, and not for private networks of free consumers; and there is a strong trend of increasing the number of consumers migrating from the captive to the free market, due to the lower cost of electricity and the recent changes in the legislation of the sector. The presented method proposes four steps, including activity planning, field survey, modeling of the existing network and determination of the HC; for the latter two, a tool was developed in VBA, called CHSFV Interface, which uses OpenDSS as a tool for calculating power flow. This tool optimizes network modeling time, automates the HC and eliminates the need for indepth knowledge of the OpenDSS programming syntax by the user. The methodology was applied through a case study, based on a theoretical circuit model and contemplating four scenarios, which simulated the insertion of PS in different buses of the circuit, including the possibility of using an energy storage system. The results indicated that the methodology proved to be effective, presenting HC values appropriate to the type of technical parameter responsible for the limitation of each scenario; it was also possible to verify that the parameter V is not applicable to the proposed method, since it did not act in any of the scenarios. Fri, 30 May 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13913 2025-05-30T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13912 Mensuração da eficiência em serviços de manutenção: estudo de caso no supermercado de uma cooperativa Silva, Vanderlei Amorim da Mon, 22 Sep 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13912 2025-09-22T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13911 De volta para o futuro: uma análise dos projetos de melhoria nos sistemas produtivos a partir da contabilidade dos ganhos Silva, Roger Freitas da This study aimed to assess to what extent and under which conditions investment decisions in improvement projects—and their respective outcomes—would differ when analyzed through the lens of throughput accounting, in contrast to traditional cost accounting. To achieve this objective, a two-stage methodological approach was adopted: (i) a Systematic Literature Review (SLR), grounded in the Literature Grounded Theory (LGT), which mapped key methods and existing gaps in the selection and prioritization of improvement projects; and (ii) a single-case study with counterfactual analysis, conducted in an auto parts manufacturing company and involving four implemented projects. The analysis applied both absorption costing and throughput accounting retroactively using real project data. Financial indicators such as Net Present Value (NPV), Payback Period, and Decision Adherence Rate (DAR) were employed, along with a counterfactual sensitivity analysis of the project assumptions. Results indicated that throughput accounting demonstrated a higher alignment between pre-investment decisions and post-implementation outcomes (DAR of 60% compared to 40% for absorption costing), lower sensitivity to assumption changes (40% project reclassification versus 60%), and greater suitability for contexts involving intensive internal manufacturing processes. The main contributions of this study are: (i) the contextual delineation of throughput accounting’s superiority, particularly in high-transformation manufacturing environments; and (ii) the introduction of the concept of decisional sensitivity to assumptions, highlighting throughput accounting’s robustness in uncertain scenarios. This research advances theoretical understanding of the application of the Theory of Constraints (TOC) to project portfolio management and offers practical implications for resource allocation decisions in production systems. Wed, 30 Jul 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13911 2025-07-30T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13910 Eficiência de investimentos em bens de capital: uma avaliação com indicadores compostos por meio da análise envoltória de dados Radmann, Maiquel Sandocan Making investments in capital goods is a strategic decision that can make a decisive contribution to an organization's performance. It is a complex process that involves the evaluation of multiple alternatives and has a high degree of uncertainty. Qualified decisions increase the likelihood of positive returns in the future by choosing the most viable alternative. The general objective of this study is to evaluate the efficiency of investments in capital goods with composite indicators (CIs) through Data Envelopment Analysis (DEA). As main results, the study addresses theoretical and managerial issues. On a theoretical level, the integration of DEA into the Directional Distance Function (DDF) model and CIs articulates internal goals and benchmarks, offering a means for measurement and comparison. On a managerial level, the combined use of scores, beta, lambda, and slack provides practical criteria for prioritization, intervention, and monitoring. In terms of decision-making, the procedure increases assertiveness in capital allocation by transforming multiple measures into an operationally clear roadmap. It outlines the path from diagnosis to implementation, contributing to more assertive choices based on well-founded analyses aligned with value creation in the investment portfolio. In addition to covering technical and theoretical aspects, it is combined with widely used financial indicators, which, in this study, form the set of individual indicators applied to generate the aggregate indicator, the CI, which allows direct comparison between the investment projects under analysis. The research not only explores the advantages of DEA, but also identifies and discusses its limitations, providing a balanced and critical view of the applicability of this technique in business practice. It is hoped, therefore, that this study will contribute to a deeper understanding of efficiency assessment methods for capital goods investments, offering support to both researchers and managers seeking to optimize the use of resources in organizations. Tue, 30 Sep 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13910 2025-09-30T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13909 Importação de bens de capital: melhorias operacionais por meio de soluções digitais Reis, Lisandra Lutz dos This dissertation investigates how digital solutions improve capital goods import processes in Brazil, as well as the challenges faced by importers. The methodology used was a qualitative, exploratory, and inductive approach, based on a literature review and semi-structured interviews with importers, exporters, and digital solutions experts. The data were analyzed using content analysis. The results reveal that the adoption of digital solutions, such as Blockchain, Machine Learning (ML), Big Data Analytics (BDA), and logistics simulation platforms, increases the efficiency of import processes, reducing costs and operational errors, optimizing customs clearance, and promoting integration among stakeholders in the logistics chain. Furthermore, these technologies strengthen real-time decision-making and increase companies' competitiveness in the international arena. This work contributes to the advancement of knowledge about the integration between capital goods imports and digital transformation in the context of international logistics. The academic advance concerns the proposal of a list of theoretical recommendations that relate the main challenges of importing capital goods to emerging digital solutions, providing support for future research. The managerial contribution concerns the identification of practices and tools that can be implemented to improve the operational, strategic, and technological management of importing companies. Wed, 10 Sep 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13909 2025-09-10T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13908 Criando valor por meio da servitização digital: um estudo exploratório em uma firma de equipamentos metal mecânico Kunz, Ildo José This study aimed to analyze how digital servitization (DS) can add value to customers and, consequently, increase revenue from product-service systems in a large familyowned company in the metalworking sector. The research, focusing on the case of SAUR company, addresses the "servitization paradox", which describes the challenges companies face in achieving financial returns when transitioning to servicebased models. Using a qualitative and exploratory single-case study approach and the theoretical lens of Knowledge-Based Dynamic Capabilities (KBDC), the company's transformation journey and its ecosystem were investigated. The findings revealed that a successful transition to DS depends on a synergistic orchestration of internal capabilities, external ecosystem management, and the application of enabling technologies. Among the main barriers identified are cultural resistance (both internal and external), a shortage of skilled professionals, and deficiencies in connectivity infrastructure. In response, SAUR demonstrated the practical application of KBDCs: (i) Sensing, by actively monitoring customer needs through tools like Customer Relationship Management (CRM); (ii) Seizing, by capturing opportunities with technologies such as IoT and telemetry to create new business models (e.g., pay-peruse); and (iii) Transformation, by reconfiguring its structure with interdisciplinary teams and innovation units, such as SAUR Tech. This strategy resulted in a 220% growth in service revenue between 2015 and 2024, demonstrating that the paradox was overcome. The conclusions reinforce that DS is a complex and non-linear process. The study contributes to theory by providing a practical and empirically validated model of the DS journey. For managerial practice, it offers a roadmap for transformation, highlighting realistic challenges and effective strategic responses. Limitations, such as the focus on a single case, open avenues for future research, including quantitative studies to validate the model, longitudinal studies to track the evolution of DS, and investigations into emerging technologies and human factors in organizations. Mon, 25 Aug 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13908 2025-08-25T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13907 An integrated model incorporating critical success factors and risk management for the development of in vitro diagnostic technologies Dalpiaz, Giovana Health innovation is essential for improving the quality of life, enabling solutions that expand access to and efficiency of healthcare services. Medical devices, particularly in vitro diagnostic tests (IVDs), which are conducted on biological samples outside the human body, play a critical role in diagnosis and treatment management, facilitating decentralized care and bringing healthcare closer to patients. However, developing such technologies is complex, as it involves technical, regulatory, market, and managerial challenges. In this context, the New Product Development (NPD) process helps address these barriers by guiding the use of management practices and tools that support development. Among these, NPD models structure processes, assist decision-making, support risk monitoring, and facilitate cross-functional integration. Although numerous models exist in the literature, a gap was observed regarding models specifically focused on IVD development, which is relevant because more general models may limit applicability in this context. Therefore, this study aimed to propose a model incorporating critical success factors and risk management practices to support the development of new in vitro diagnostic technologies. To achieve this, the Design Science Research (DSR) method was adopted. The DSR method guides the construction of artifacts (the NPD model) capable of solving real-world problems, in this case, providing a structured representation of the NPD process. Initially, a Systematic Literature Review was conducted to map gaps and identify models applicable to medical device development. Based on these findings, the development stages, six critical areas, and a risk management approach were defined, which underpinned the first version of the model (v.1). Subsequently, interviews and questionnaires with seven professionals allowed the identification of challenges, critical factors, and stakeholders, leading to the first optimization (v.2) by integrating empirical data with literature findings. Evaluation with six specialists and a focus group led to a second optimization (v.3), incorporating practical context insights and confirming the model’s potential for IVD applications. Finally, the last stage consolidated the lessons learned, resulting in the final version of the model (v.4), named IRIS (Integrated Risk and Innovation Strategic), accompanied by supporting materials to facilitate its application in real-world scenarios. This study presents an innovative proposal by developing an NPD model tailored to IVDs, even though it integrates existing elements. The tool, which has a national focus, contributes to expanding knowledge and consolidating good practices related to critical success factors and risk management. Among the limitations, the following stand out: the small number of respondents and the fact that the model may not yet address all IVD-specific requirements, necessitating continuous refinement. These limitations, however, open opportunities for future research, such as applying the model in real projects and enhancing it with new tools and metrics. In summary, the developed model not only expands academic knowledge but also serves as a practical resource to support the development of diagnostic technologies that positively impact health and quality of life. Wed, 01 Oct 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13907 2025-10-01T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13906 Proposição de um método para aplicação integrada das técnicas de lean manufacturing e teoria das restrições em fornecedores da indústria automobilística Vargas, Gilberto Castro In the global value chain (GVC), metal parts suppliers play a key role, as their operations directly affect the quality and efficiency of automakers' final assembly lines. The growing competitiveness of the sector requires companies to adopt new production and operations management strategies in order to improve their economic performance and increase their competitiveness in the market. The incorporation of methods, techniques and tools aimed at continuous improvement is essential, encompassing the identification and elimination of unnecessary processes, the reduction of inefficiencies and the lowering of operating costs, factors which ultimately contribute to increasing suppliers' profitability. Manufacturing excellence strategies play a crucial role in transforming production processes in factories, ensuring sustainable and profitable business growth. Therefore, this study aims, based on a review of existing literature, to develop and implement a method that integrates techniques and tools from Lean and the Theory of Constraints (TOC) in a production system of a supplier of components to automakers in the automotive sector. In addition, the research analyzes the effects of implementing the proposed method in the production flow of a supplier within the global value chain of the automotive sector. These effects were evaluated using economic and financial performance indicators, allowing for a comprehensive analysis of the results. The study mentions that the process function should not be interrupted, highlighting the importance of areas such as Production Planning and Control (PCP) and logistics. These areas, often seen as functional and little explored, can create barriers that interrupt the flow of the process. Integrated flow management is presented as an approach that seeks to break down these functional boundaries, promoting a continuous and efficient flow. This suggests that more effective coordination between the different areas can significantly improve the operation as a whole. The findings of this study show that the implementation of the proposed method generates positive and significant effects on the efficiency of the production flow. This finding not only validates the relevance of integrated Lean and TOC practices, but also highlights the importance of a systematic approach to continuous improvement in the automotive supply chain. In summary, the results obtained reinforce the need for suppliers to adopt innovative and effective practices, thus promoting a virtuous cycle of growth and competitiveness in the global market. Fri, 20 Dec 2024 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13906 2024-12-20T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13905 Gestão de estoques em indústrias de fluxo contínuo: desafios e estratégias no contexto Make to Order Krindges, Amanda Melo The competitiveness of the global economy, combined with market dynamics and the constant evolution of consumer demands, has directly influenced the efficiency of production chains. This competitive landscape poses a significant challenge for companies, requiring them to meet increasingly specific customer demands. As a result, product variability increases, leading to unpredictability in both the required materials and production lead times. In light of this, it becomes essential to balance often conflicting objectives to ensure the level of service expected by the market. In this context, inventory plays a strategic role in mitigating misalignments between production capacity and market demand. However, inventory management in petrochemical industries becomes particularly complex when production parameters are uncertain, the manufacturing model follows a make-to-order approach, and the production flow is continuous. Recognizing the strategic importance of inventory management, organizations have begun to reassess their current practices in an effort to understand not only what is done, but also how these processes are conducted. Thus, the objective of this study is to analyze inventory management in petrochemical industries operating in a continuous flow system, aiming to improve delivery efficiency and reduce lead times in make-to-order contexts. To achieve this objective, a systematic literature review was conducted to understand how the topic is addressed in theory, along with a case study in a thirdgeneration petrochemical company located in Manaus (Amazonas, Brazil) to explore practical strategies. The main findings of the research allowed for a comparison between theory and practice, identifying opportunities for improvement in the inventory management system of the analyzed unit. Furthermore, the study observed interactions among internal departments and their communication with external links in the supply chain. Based on these findings, four guidelines were proposed to support inventory management in an integrated, strategic, and efficiency-oriented manner, including recommendations for tools and technologies that may contribute to their practical implementation and further development. Thu, 28 Aug 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13905 2025-08-28T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13903 Análise das propriedades de pisos de concreto lapidado com diferentes tratamentos superficiais Takeda, Nereu Teixeira Rodrigues Grinding and abrasive polishing are essential processes in the treatment of concrete surfaces, as they improve wear resistance, reduce roughness, and increase durability. These techniques have been applied to indoor concrete floors, aiming to meet performance requirements in commercial, corporate, and residential environments. The efficiency of surface treatments is determined by physical, mechanical, and chemical properties that directly influence the service life of the material. The main objective of this study was to analyze the properties of indoor concrete floors subjected to different levels of abrasive polishing, focusing on their resistance, functional performance, and durability. An experimental program was carried out with 12 concrete slabs, of which 10 received surface treatments and 2 were used as references. After 28 days of wet curing, diamond abrasives, latex-based cement, silicate-based surface hardener, sealant, and polishing pads with progressive grit sizes (#200, #400, #800, #1500, and #3000) were applied. The effectiveness of the treatments was assessed through standardized tests, including abrasion resistance, gloss measurement (GU), surface roughness, hardness, chemical resistance, and stain resistance. The results showed significant improvements in abrasion resistance, with wear reduction of up to 24.86%, progressive increases in gloss, reaching 76.86 GU in the high-gloss finish (#3000), and reductions in surface roughness to 0.85 µm. Hardness increased by up to 82.30% compared with the reference samples, while chemical resistance was classified as Class A. In the stain resistance tests, the highest polishing levels achieved the maximum cleaning classification (Class 5). It was concluded that abrasive polishing of indoor concrete floors provided significant physical, mechanical, and chemical performance improvements, directly contributing to increased durability and reinforcing the importance of choosing appropriate surface treatments. Mon, 22 Sep 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13903 2025-09-22T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13902 Avaliação do desempenho da estação de tratamento de esgotos sanitários da Unisinos no decréscimo de ibuprofeno, diclofenaco sódio e metoprolol Santos, Leonardo Zanoelo dos In addition to conventional pollutants, emerging contaminants (ECs) such as pharmaceuticals—detected at trace levels (µg/L to ng/L) and not yet regulated by Brazilian environmental legislation—have received increasing scientific and regulatory attention. Due to their persistence and pharmacological specificity, they pose significant challenges to Water and Wastewater Treatment Plants (WTPs and WWTPs), which were not originally designed for their removal. In this context, the present study evaluated, over six sampling campaigns and four monitoring points at the Unisinos WWTP (São Leopoldo Campus, RS, Brazil), the treatment efficiency in reducing the concentrations of pharmaceuticals such as Diclofenac Sodium, Metoprolol, and Ibuprofen. The study also assessed parameters such as COD, TOC, pH, and residual ozone, and compared two analytical techniques for micropollutant detection: UV254 absorbance and Liquid Chromatography. The Unisinos WWTP showed good performance in meeting the standards established by CONSEMA Resolution No. 355 (2017) for pH and COD, with the latter presenting an average removal efficiency above 75%. Regarding pharmaceuticals, influent concentrations of Ibuprofen and Diclofenac Sodium ranged from 21.10 to 987.46 ng/L and 24.58 to 4464.99 ng/L, respectively. Ibuprofen was more susceptible to the applied treatments, with 51.43% removal in the UASB reactor and 65.03% after ozonation. Diclofenac Sodium, on the other hand, showed greater persistence, with only 4.83% removal in the UASB reactor and 35.47% following the ozonation step. Metoprolol was detected in only one sampling event, indicating a low concentration of this compound in the wastewater at the Unisinos WWTP. These findings indicate that the biological processes employed at the University's WWTP are effective in reducing Ibuprofen concentrations, likely due to its higher biodegradability, but appear to be less effective in treating Diclofenac Sodium. The ozonation step showed low efficiency in pharmaceutical removal, suggesting that the current ozone dosage is insufficient. Statistical analyses revealed a strong negative correlation between Diclofenac and TOC, indicating that the pharmaceutical's removal is associated with the reduction of organic load. TOC also showed a positive correlation with COD and UV254 absorbance, reinforcing its role as an indicator of organic matter. Ibuprofen exhibited a moderate correlation with UV254, suggesting that its presence influences absorbance in this spectral range. In contrast, Diclofenac had a weak correlation with UV254, which may be related to its higher resistance to degradation. These results suggest that UV254 monitoring can be useful for the indirect assessment of certain micropollutants, such as Ibuprofen. Overall, the study indicates that while the Unisinos WWTP meets conventional treatment standards, it presents limitations in the removal of persistent pharmaceuticals. The findings highlight the importance of continuous monitoring and the adoption of advanced technologies in the context of environmental sanitation. Thu, 26 Jun 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13902 2025-06-26T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13901 Avaliação da autocicatrização em concretos contendo cimentos ternários do tipo LC³: desenvolvimento e impacto na durabilidade Gil, Leonardo Masiero The objective of this study was to evaluate the self-healing phenomenon and its impact on the durability of concretes containing ternary cements of the LC³ type. For this purpose, concrete mixes with three different water/cement ratios were developed, using, in addition to the LC³ cement, the CPV ARI cement, in order to provide a comparison between both. The cracking of the samples was made by the diametrical compression test, with an opening limiter device, at the age of 7 days, and the curing procedure adopted was submerged in water for a period of 42 days. Self-healing was evaluated through the analysis of crack images by microscopy, the ultrasonic wave propagation velocity test and the low-pressure water penetration test. All concrete mixes also had molded specimens intended for the compressive strength test. For the durability analysis, in addition to the study of water penetration, the amount of material present in the crack was identified, before and after the test, in order to understand its permanence capacity. The material formed on the surface of the cracks was collected and characterized in terms of its mineralogy through the X-ray diffraction (XRD) test. Ternary cement of the LC³ type has self-healing capacity, although at a lower level when compared to CPV ARI cement, under the conditions of this study. The maximum healing achieved by mixtures with LC³ was 64.5% and for CPV ARI cement it was 76.9%. Much of the material formed in the healed cracks remained after the action of water, for both cements analyzed, indicating its probable contribution to durability. The presence of C-S-H, Ca(OH)2 and CaCO3 was identified in the healing products for CPV ARI cement, and the same crystalline phases for LC³, however with the presence also of C-A-S-H and AFm. Regarding compressive strength, a superior performance of LC³ cement was observed. Such behaviors found in the study are probably linked to the fact that ternary cement of the LC³ type culminates in the formation of more stable hydration products and a denser cementitious matrix, which hinders the migration and percolation of this material to the cracks analyzed, and benefits the development of compressive strength. Tue, 10 Jun 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13901 2025-06-10T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13867 Oraculum: a model for self-adaptive system optimization in smart environments Noetzold, Darlan This dissertation introduces Oraculum, a modular self-adaptive framework designed to support the monitoring, prediction, reasoning, and adaptation of distributed systems operating in smart environments. Many existing solutions treat these tasks as disconnected components, relying on static training phases, fixed adaptation logic, and reactive decision-making triggered only after system degradation is detected. Oraculum proposes an integrated approach in which monitored metrics are continuously collected and processed to generate predictions and select actions in advance of performance failures. The framework consists of three key components. SHiELD is a sensor data simulator that generates synthetic time-series data using ARIMA models and applies heuristic methods-such as filtering, aggregation, and compression-to simulate realistic variability and reduce processing overhead. OntOraculum is a semantic ontology that formalizes performance metrics into five categories and enables the system to classify and validate alerts through rule-based reasoning and SPARQL queries. The adaptation engine uses regression and classification models to forecast short-term metric behavior and integrates a reinforcement learning agent based on a Markov Decision Process (MDP), which receives contextual states and selects actions such as resource scaling, scheduling adjustment, or service reconfiguration. The RL engine also includes a retraining mechanism that periodically updates policies using new data. The entire architecture operates in a closed feedback loop, using predictions and inferred knowledge to support earlier and more informed decisions. The model includes automated pipelines for dataset creation, model training, hyperparameter tuning, and continuous learning, covering both predictive models and RL agents. Experimental validation was conducted in a containerized testbed with simulated load variation. Results were collected across multiple performance indicators, including CPU, memory, latency, and model accuracy. The contributions of this work are: (i) the proposal of an integrated framework that combines monitoring, forecasting, semantic validation, and adaptation; (ii) the development of SHiELD for synthetic data generation and heuristic preprocessing; (iii) the design of OntOraculum for metric classification and rule-based inference; (iv) the implementation of a prediction-based strategy for early alert generation to reduce adaptation delay; and (v) the modeling of an RL engine with configurable actions and scheduled policy retraining. Wed, 16 Jul 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13867 2025-07-16T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13844 Heimdall: an architecture for online machine learning through imbalanced data Vargas, Vitor Werner de Machine Learning (ML) algorithms have been increasingly applied to domain areas where data is available for process automation. However, in the case of imbalanced data applications, the training process is challenging since ML algorithms intrinsically learn from balanced distributions. This research proposes Heimdall, a resourceful architecture for online ML through imbalanced data. Designed as a service for prediction and analysis requests, Heimdall serves existing applications from external systems, extending artificial intelligence capabilities and automated processes to traditional applications supervised by experts. The architecture focuses on efficiently solving imbalance and improving performance through a set of good practices compiled from mapped studies – such as probability threshold optimization, high-performance sampling, and ensemble learning. Furthermore, Heimdall proposes and evaluates the efficiency of novel functionalities. Firstly, a new performance metric corrects precision-recall balance according to the application’s needs, enhancing probability threshold optimization. Secondly, the architecture independently automates data management and training pipelines through two rule-based reactive agents constantly monitoring data changes and model degradation to trigger processes. These reactive agents compose a strategy for adaptive efficiency, enabling better and more stable performance by sacrificing efficiency in warm-up conditions, and maintaining excellent performance and efficiency in hot conditions. To adequately evaluate the architecture, this study implemented a prototype for one well-studied and severely imbalanced application – Credit Card Fraud Detection (CCFD). Isolating the improvement of each proposed functionality, the analysis evaluated performance over time and overall performance against related works through five scenarios. Namely, the results indicated that the prototype achieved excellent performance even with few anomalies, and improved systemic efficiency over time. Finally, the overall performance achieved comparable results to the best-performing related works. Tue, 26 Sep 2023 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13844 2023-09-26T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13788 DNA Barcoding helping the identification of Brazilian cetaceans Silva, Vanessa Souza Cytochrome C Oxidase Subunit I (COI) is the mitochondrial gene recognized as the DNA Barcoding and used to identify different animal species. In the case of cetaceans (porpoises, whales and dolphins), the COI can assist in more accurate identification and/or confirm the morphological identity of specimens found in advanced state of decomposition on the Brazilian coast, without evident external diagnostic characters. This study aimed to test the efficiency of the COI in the specific identification of most of the 47 species of cetaceans off the Brazilian coast and to generate their respective sequences for depositing them in public sequence databases, in order to subsidize new work by researchers from any country. Part of the world. To this end, the COI was amplified to 152 specimens collected by 13 Brazilian institutions and sent for analysis. The comparison between the sequences obtained and those of cetacean species previously deposited in GenBank was made by the Blast tool, which is based on the similarity between the sequences, which was performed on the Barcode Of Life Data System platform. In addition, most samples had a specimen deposited in a scientific collection as witness material, or specimen images, which allowed their a priori morphological identification in cases where morphological identification diverged from molecular identification. As a result, COI sequences were obtained from 33 species, which represent 70% of the 47 cetacean fauna recorded for the Brazilian coast. Of the 152 sequences analyzed, the COI gene was inefficient in identifying only two species: Stenella coeruleoalba and S. clymene due to the absence of the so-called “gap barcode”, i.g., the absence of well-established inter and intraspecific limits. These results suggest that barcode DNA was efficient in identifying the great majority of cetacean specimens (~93%) studied. However, for species of Delphinidae family the identification should be integrated with other methods, such as Cyt b, nuclear DNA and morphological character analysis whenerver possible. Thu, 28 Nov 2019 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13788 2019-11-28T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13785 Estudo da durabilidade do concreto frente à degradação com ataque de sulfatos em Estações de Tratamento de Esgoto (ETE) Bender, Samantha Fernanda The recurrence time established in NBR 8681:2003 for the durability of concrete structures is 50 years. It is expected that concrete structures will not present problems or pathologies within this interval. In this research, the durability and degradation of concrete are addressed due to their relevance and the need for special care in aggressive environments such as Sewage Treatment Plants (ETEs), which have difficulties in developing treatments for concrete with pathologies resulting from sulfate attack. The objective of this study is to evaluate the durability of sewage treatment plants, carrying out inspections, diagnosing anomalies and reporting on their treatment. Within this context, for the analysis and methodology applied in this study, “on-site” inspections were carried out in ten ETEs and samples were collected in one ETE for the sewage and concrete inside the tank in which the tests were subsequently carried out followed The test out followed the produce of NBR 16937 – Aggressive Waters – Durability of Concrete Part 6 with the collection of sewage and the X-ray Fluorescence Test (FRX) to verify degradation with the presence of sulfate with the collection of a sample from the internal wall of a tank in ETE sewage. In addition to the samples collected, to determine the data analysis, it was necessary to carry out a comparison with other researched standards regarding the chemical characteristics of the ETE sewage. The result of the sewage sample collected in June 2024 was SO₄⁻² = 181.10 mg/l. And the result of the collection in October 2024 presented the value found for the study SO₄⁻² = 211.97 mg/l. Regarding the analysis, concrete samples, collected on the inner wall of the treatment tank, were analyzed through FRX, resulting in that the five samples are basically formed by two components, SiO2 = 41.517% and CaO = 10.712% at the depth point at 3.00 cm and alkaline earth metals 6.357% (MgO) during sample collection. It also presented at the point 3.00 centimeters a low concentration of metal oxides (Na2O and K2O) and aluminum (Al2O3). After analyzing the results, it was possible to verify the intensity of the concrete degradation action in ETE in the face of sulfate attack Fri, 02 May 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13785 2025-05-02T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13745 Análise exploratória da eficiência de sistemas produtivos utilizando o Benchmarking interno e a DEA Window Hamdan, Yuri Dias Efficiency is a key indicator for assessing the performance of an organization's production units. Analyzing efficiency allows managers to assess how companies are operating in comparison with the productivity targets set for different periods of time. The aim of this study is to analyze efficiency over time by means of internal benchmarking and the DEA Window of the production process of a company in the metal-mechanics segment. The DEA Window is a non-parametric panel approach that is suitable for measuring the level of efficiency of various decision-making units (DMUs) in relation to their own performance over time. A case study is carried out, seeking to obtain the efficiency scores of the DMUs, as well as comparing the efficiency scores and the targets and gains of the DEA and DEA Window models with windows of three and six periods. The main results show that the conventional DEA model obtained an average efficiency of 75.93%, while the three- and six-period window approaches had average efficiencies of 98.64% and 97.11%, respectively. Furthermore, in the comparative analysis of targets and gains, the conventional DEA model indicated gains of up to ten times the value of certain inputs, when compared to the DEA Window models, highlighting the Window models' discrimination problems. The main contributions of this work indicate that, when a longer time series is available, the window approach associated with internal benchmarking can be an alternative for evaluating efficiency over time. In addition, the DEA Window model allows for a dynamic analysis of efficiency, since the use of moving windows makes it possible to follow the evolution of efficiency over time. Mon, 17 Mar 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13745 2025-03-17T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13740 Modelagem de processos de negócios para a interoperabilidade de dados de saúde na linha de cuidado do câncer de mama Monteiro, Gabriela de Andrade The healthcare sector has been following the global trend of adopting digital technologies, driven by the need for greater efficiency, systems integration, and improved quality of patient care. However, one of the challenges mentioned in the literature is the lack of interoperability of healthcare data. Business process modeling (BPM) is a tool widely used in several industrial sectors designed to manage and improve processes, allowing a global view of the process as it is executed. Although there are some empirical studies that use BPM to develop healthcare data interoperability, there is still no discussion about its direct impact. Given this context, this study aims to evaluate how BPM can assist in the development of data interoperability with a focus on the breast cancer care line, specifically in the disease screening phase. To understand and verify the current state of the subject, a systematic review of the literature is conducted. Next, a case study is conducted to evaluate a process model, developed with Business Process Model and Notation (BPMN) notation, which describes the breast cancer care line in the screening phase in a city in the interior of Rio Grande do Sul, with the health data collected throughout this process mapped in the model. The data collected to implement the model are obtained through focus group techniques and document analysis. The evaluation of the model is done by collecting data obtained through semi-structured interviews conducted with experts in the field. The study shows that the tool plays a significant role in promoting the interoperability of health data, with emphasis on the technical and operational aspects, as well as improving communication between the teams involved. The integration between the process view and the data view emerges as an essential contribution, reinforcing the importance of replicating this approach in different scenarios to expand the analyses available in the literature. Fri, 25 Apr 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13740 2025-04-25T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13739 Gestão de portfólio de inovação: um modelo qualitativo orientado pelos objetivos estratégicos da empresa Santos, Cristiano Menegon dos This research investigates the relevance of innovation portfolio management for new products in maintaining corporate competitiveness, profitability, and sustainable growth. The study emphasizes the importance of continuous evaluation of the innovation portfolio to ensure its alignment with the organization's mission and purpose. Additionally, it highlights the need to consider both commercial and financial objectives, as well as non-financial goals, ensuring adherence to Environmental, Social, and Governance (ESG) targets to prevent deviations from strategic objectives. The management of the new product portfolio primarily aims at maximizing value and ensuring convergence with the corporate strategy. Thus, this research seeks to identify effective tools and methodologies, consolidating them into an applicable artifact that enables the evaluation of the alignment between the innovation portfolio and the company's strategic objectives. To achieve this goal, the Design Science Research (DSR) methodology was adopted. The study proposes qualitative assessment model to position the innovation portfolio and project its strategic outcomes. The research identifies innovation indicators and develops management dashboards that provide a comprehensive view of the company’s current state and future perspectives. Additionally, the Fuzzy DEMATEL method is employed to assess the influence of each criterion in portfolio classification from the perspective of evaluators. The results highlight strategic factors that directly impact portfolio management, underscoring the importance of a structured dashboard for integrated analysis and data-driven decision-making. This approach provides companies with tools for a more balanced and efficient management process, ensuring an innovation portfolio that is aligned with strategic objectives and enhancing competitive predictability. Fri, 28 Mar 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13739 2025-03-28T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13738 Diagnóstico ESG como estratégia de Incorporação de valor em uma empresa metal-mecânica Schneider, Ângelo The present research aims to propose and validate a diagnostic model for ESG management aimed at generating value in organizations, thereby facilitating sustainable strategy. With the help of prioritizing the analyzed elements in an integrated manner and subsequent significance analysis using the QFD (Quality Function Deployment) matrix tool, the real needs of customers in technical requirements were identified, ensuring quality in the development of products and services related to the analyzed elements alongside variables linked to ESG management, contributing to value generation in organizations and facilitating the sustainable strategy. The study is based on qualitative methodology due to the bibliographic study, and quantitative study with a questionnaire survey applied in the company (matrix) and its subsidiaries, among key suppliers, and post-sales, aimed at identifying opportunities in each pillar of ESG in different bases and also integrating elements into the body context corporate integrated result, providing specific indicators for each evaluated theme. The present study identified 353 elements or issues, structured into 38 topics and divided into 6 relevant management themes endorsed by ESG management frameworks such as GRI, ISEB³ and CDP. Through the assessment of ESG elements and their performance, the relationship with compliance, integrity, and organizational culture was also examined, offering a framework for result quantification. This relationships framework forms a management model that characterizes how the company can generate tangible and intangible value in a sustainable way. This research is limited to the case study of the analyzed company only. Therefore, as a proposal for future research, a similar model based on the same basis may be applied for the purpose of comparing the results and identified priorities. This study indicates that the ESG management model as a sustainable strategy has the potential to include and leverage the company's alignment to the scenario that seeks to generate value for stakeholders. As part of this premise, this research aimed, through diagnostics, to incorporate economic-financial value, customer satisfaction, and, most importantly, the delivery of long-term results in a metalworking company. Fri, 28 Mar 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13738 2025-03-28T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13735 Reforço à flexão de vigas em concreto armado com a utilização de chapas pré-fabricadas em UHPC Grings, Guilherme Gregio This study investigates the use of prefabricated Ultra-High Performance Concrete (UHPC) panels as a solution for flexural strengthening of reinforced concrete beams. UHPC is an advanced cementitious material that exhibits high compressive strength, elevated toughness, and superior durability in aggressive environments, making it a viable alternative for structural repair and strengthening. The research was developed through experimental approaches, beginning with an in-depth literature review on conventional strengthening techniques, such as reinforced concrete jacketing, application of steel plates, and carbon fiber reinforcement. This review enabled a direct comparison between these traditional methods and the potential of UHPC. The experimental phase involved the fabrication of reinforced concrete beams and UHPC panels, with variations in the presence of internal reinforcement within the panels. Chemical and mechanical anchoring methods were employed to bond the strengthening elements to the beams, aiming to ensure material adhesion and evaluate the influence of bonding on the efficiency of the reinforcement. Structural testing was conducted using four-point bending tests, allowing for the assessment of the load-bearing capacity of the strengthened elements, their deformations, and the crack patterns observed throughout loading. The results demonstrated that beams strengthened with reinforced UHPC panels exhibited a performance increase of 224% compared to unstrengthened reference beams, particularly showing reduced crack widths and higher flexural resistance under serviceability limit states (SLS). Based on the analysis of the results, it was concluded that the use of prefabricated UHPC panels as structural reinforcement represents a promising solution, combining high mechanical performance, minimal architectural impact, and enhanced durability when compared to traditional systems. Furthermore, the study highlights that the proposed method enables the practical application of UHPC in structural rehabilitation projects, optimizing costs and facilitating on-site execution. Thus, this research contributes to the advancement of structural strengthening techniques and paves the way for new UHPC applications in the civil engineering field. Wed, 30 Apr 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13735 2025-04-30T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13734 Integração de sistemas de produção de biogás em estações de tratamento de esgotos com estratégia para a resiliência urbana em face às mudanças climáticas Pereira, Brenda Natália Population projections for 2054 estimate a total of 9.9 billion people worldwide, with more than half living in urban areas. This scenario poses challenges for urban infrastructure, requiring innovative and sustainable solutions to meet increasing demand in limited spaces. Wastewater Treatment Plants (WWTPs) play a key role in this context and, when using anaerobic processes, generate methane as a by-product. Methane has a global warming potential approximately 28 times greater than carbon dioxide, but it can be converted into thermal, electrical, mechanical energy, or vehicular fuel. The use of methane in WWTPs presents an opportunity for decentralized renewable energy generation, contributing to the reduction of greenhouse gas emissions, circular economy strategies, odor control, and the environmental and financial viability of these facilities. This study aimed to estimate the biogas generation potential of four WWTPs located in the state of Rio Grande do Sul, Brazil — Morada dos Eucaliptos (Novo Hamburgo), Vicentina (São Leopoldo), Tega (Caxias do Sul), and Serraria (Porto Alegre) — as well as to calculate the avoided emissions of greenhouse gases and the potential for electricity generation from methane. The results showed differences among the plants, with Serraria standing out for its highest specific methane production per kilogram of COD removed (0.232 m³ CH₄/kg COD) and the greatest energy generation potential (17,057.14 kWh/day). The Tega plant showed negative methane values due to the dilution of wastewater by the stormwater drainage system. The estimated avoided emissions revealed considerable reductions, especially at the Serraria plant, which could achieve a net reduction of over 51,000 tons of CO₂ equivalent per year. It is concluded that the energy recovery from methane can make WWTPs less dependent on the power grid and more capable of responding to extreme events and system instabilities, contributing to urban resilience and aligning with sustainability and climate adaptation goals. Mon, 14 Apr 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13734 2025-04-14T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13733 Avaliação do beneficiamento e recuperação de materiais críticos de ímãs de NdFeB pós-consumo Kich, Agnes Mitzi The increase in Waste Electrical and Electronic Equipment (WEEE) generation has become a global concern, driven by rapid technological advancement and the growing consumption of electronic devices. The improper disposal of this waste not only has the potential to cause negative environmental impacts but also results in the loss of valuable resources, including rare earth elements (REEs), which are essential for the production of modern technologies. In this context, this study evaluated the feasibility of recycling NdFeB magnets from post-consumer hard disk drives (HDDs) through the recovery of these materials. The hydrogen decrepitation (HD) method was employed as an initial step for the extraction and separation of the magnets. This process was applied with the goal of recovering materials for the subsequent production of recycled magnets using the conventional powder metallurgy route. The powder preparation stage, prior to compacting the test specimens, was adapted to reduce environmental impact and occupational risks by eliminating the use of solvents during milling. This modification aimed to minimize the generation of hazardous liquid effluents and workers’ exposure to toxic substances, while also simplifying the process. NdFeB magnets from WEEE were characterized using ICP-OES, XRD, XRF, and SEM techniques. The use of HD demonstrated a significant increase in the grinding efficiency of the magnets, rising from 25.33% to 73.33%. This percentage refers to the amount of material effectively ground within the same milling time. However, the sintering stage yielded unsatisfactory results, as the absence of solvents during milling affected particle size distribution and specimen compaction, promoting oxidation and compromising the cohesion of the resulting magnets. The research highlights the need for strict control of processing conditions to minimize these effects. The SEM micrographs indicate that HD is a promising approach for NdFeB magnet recycling. Nevertheless, adjustments are required to enable the effective production of recycled magnets, emphasizing WEEE recovery as a key strategy for reducing the extraction of critical raw materials and promoting material circularity. Wed, 26 Mar 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13733 2025-03-26T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13694 Tekohá: um ambiente virtual para o ensino da história das missões jesuíticas no Rio Grande do Sul Martins Júnior, Renato da Veiga Virtual Reality (VR) is defined as a technology that creates three-dimensional digital environments that require physical immersion and sensory stimulation, are interactive, and can mentally transport the user to another place. It is a computational technology that has grown in many forms, being increasingly used in different contexts. Numerous studies on the use of VR in adult education have produced positive results, providing students with an authentic context where they can develop their scope of learning, visualize situations and concepts in a unique way, increase time on task and enjoyment of learning, increase motivation, deepen learning, and improve long-term retention. However, little is known about the use of VR in children’s education, but the few results already obtained point to its stimulating potential. In this work, a systematic review on the use of VR in children’s education was carried out and a project for the use of VR to support history teaching was developed. A virtual environment, called Tekohá, was specially designed for use by children in the fourth and fifth grades of Elementary School. The virtual environment presents students with an introduction to the Guarani Jesuit Mission, now ruins in São Miguel das Missões in Rio Grande do Sul/Brazil, considered a UNESCO World Heritage Site and part of the curricular requirements for Elementary School. For the evaluation, a controlled experiment with 130 students from a private school in Porto Alegre was conducted. The results indicate that the Tekohá virtual environment is easy and fun to use and that the use of VR motivates and engages students in the learning process, enabling a sense of presence in situations from the past in an immersive and realistic way. Regarding learning, it was possible to statistically confirm that the group that used Tekohá performed better in the knowledge test about the Jesuit Mission of São Miguel Arcanjo. Tue, 29 Apr 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13694 2025-04-29T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13600 Desempenho acústico de sistemas de pisos com a utilização de lajes pré-fabricadas nervuradas de vigotas protendidas Lima, Felipe Schneider de Precast beam-and-block floor systems of prestressed beams and inert filling elements are a frequent used technical solution in residential buildings, where normative requirements of acoustic performance are applicable. Despite this context, there is still a considerable gap in knowledge regarding the acoustic performance of this constructive system. This study evaluated the behavior of beam-and-block systems, with prestressed beams and ceramic hollow blocks towards air and impact sound, analyzing the influence of different blocks and different layers complementary to the structural layer. The study conducted experimental (laboratory) and numerical (computational estimate, with software SONarchitect®) analysis in 21 distinct slabs compositions, with 2 of these compositions replicated in a building for experimental analysis in the field. The use of higher thick blocks, although it did not reflect on better performance when analyzed slabs composed only by its structural layer, influenced the behavior of the systems when added complementary coating layers, and greater efficiency assigned by the coating layers was observed in the systems of greater rigidity (with the most thick blocks). The results showed that solutions that give greater efficiency to the floor systems in relation to airborne sound do not necessarily constitute the most efficient solutions to impact sound. For airborne sound, the increase of mass from the addition of complementary layers has little impacted systems efficiency, unlike expected on homogeneous constructive systems, reinforcing the thesis that sound means of transmission in heterogeneous slabs are more complex. Regarding impact sounds, the successive addition of layers provided greater efficiency to the analyzed floor systems, with significant gains when applying a laminate floor finish layer, reinforcing the strong influence of the elastic characteristics of the floor system surface. In all systems evaluated in this study, the resonance effect was observed within the cavities of the hollow blocks, either in experimental analyzes in laboratory and field, eather in the computational numerical analysis. However, the installation of suspended plasterboard lining compensated part of the reduced loss of sound transmission resulting from this phenomenon, both in the laboratory samples and in the field analysis. Still, in the field, the impact pressure levels observeds indicate that the presence of a suspended plasterboard lining was able to minimize the effects of a probable failure on the damping system (resilient layer), possibly due to executive inconsistency in the floating floor (resilient layer). Differences observed between estimated and field values may indicate that variables not considered in statistical energy analysis methods, such as beams direction and floor system linking with adjacent structural elements, influence at sufficient scale the results to change system classification before the requirements of NBR 15575-3. Mon, 06 Mar 2023 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13600 2023-03-06T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13589 Estruturas fundamentais para simulação de cenários de layout produtivo Plack, Augusto Georig The constant search for increased productivity has been one of the main strategies used by companies to remain competitive in an increasingly dynamic and demanding market. Over the years, computer simulation of production flows and layout planning have emerged as essential tools for achieving operational excellence. The research highlights the importance of SLP in the physical organization of processes, considering aspects such as material flow, resource allocation and space restrictions. In parallel, computer simulation is used as a validation tool, allowing the analysis of different scenarios and the identification of opportunities for improvement before implementing changes in the layout. The objective of this work is to identify the structures to assist in the process of systematic layout planning and discrete event simulation, encompassing concepts from production engineering. To achieve this objective, the Action Research methodology was adopted and applied in an automotive company located in the northwest of the state of Rio Grande do Sul, Brazil, which manufactures parts for large automakers. The company already uses discrete event simulation, but in a limited way, leaving a wide field of opportunities to explore this tool to support more complex and strategic decisions. In addition, the dissertation addresses complementary concepts, such as the Theory of Constraints (TOC) and other methodologies applied in production engineering, aiming at creating a robust basis for improving production flows. In general, the objective of the research was achieved through the elaboration of two large frameworks that serve as guides for the application of Layout Planning and the development of layout simulation models, facilitating their adoption in the industry and contributing with important foundations in the literature. The research provides a detailed methodological approach for the joint application of these tools, filling a gap in the literature and facilitating their implementation in industrial practice. Fri, 28 Feb 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13589 2025-02-28T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13576 Estudo experimental de criopreservação de espermatozoides usando evaporação de filme fino de nitrogênio Vidaletti, Henrique Roth The cryopreservation of biological material, specifically semen, allows for the long-term storage of samples while preserving their viability and function after thawing, contributing to increased success rates in assisted reproductive technologies. Various freezing protocols and thawing techniques have been developed and evaluated, utilizing new cryoprotective agents (CPAs) aimed at vitrifying biological material and preventing the formation of crystals that can damage cells. In this study, the objective was to evaluate vitrification through thin film evaporation of liquid nitrogen (LN2). For this purpose, an experimental apparatus was developed, comprising a vacuum chamber and cryoprobes containing liquid nitrogen. The sample was stored in a PDMS device between two copper plates with a surface of microporous metal foam (nickel or copper). Jets of LN2 were applied, promoting the evaporation and freezing or vitrification of the samples. The pressure in the chamber and the sample temperatures were monitored throughout the experiments. Initially, cryoprotective agents such as glycerol in PBS (Phosphate-buffered saline) and a solution containing 1 mol of sucrose, 35% v/v glycerol, 1% v/v human albumin, and 64% v/v HTF (Human Tubal Fluid) were used. The evaluated variables included sample volume, material and thickness of the metal foam, and the thickness of the PDMS reservoir. Subsequently, tests with human semen were conducted using different combinations of sucrose (0.25 mol/l ,0.5 mol/l and 1 mol/l), human albumin (1% v/v), glycerol (35% v/v), HTF (Human Tubal Fluid) (64%), and TYB (test yolk buffer). The EFF experiments demonstrated that the concentration of cryoprotectants, volume, material and thickness of the metal foam, and the thickness of the reservoir significantly influence cooling rates and vitrification. Glycerol at 50% v/v favored vitrification, while copper foams provided higher cooling rates due to their thermal conductivity. However, the presence of residual water in the biological samples hindered vitrification, highlighting the need for optimizations in preparation techniques and studies on new cryoprotective solutions. Fri, 01 Nov 2024 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13576 2024-11-01T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13575 Análise de desempenho de tubos capilares como dispositivos de expansão em sistemas de ar-condicionado no contexto do índice de desempenho de resfriamento sazonal Garcia, Guilherme Kley The Brazilian Labeling Program (PBE) changed the method air conditioners are classified starting in 2023, moving away from the Coefficient of Energy Efficiency (CEE) and adopting the Seasonal Cooling Performance Factor (SCPF). This study aimed to evaluate the performance of capillary tubes as expansion devices in variable refrigerant flow refrigeration systems operating with R-32 refrigerant. To achieve this, a numerical model was developed using the Engineering Equation Solver (EES) software, where the performance of the refrigeration cycle and its main components: compressor, condenser, capillary tube and evaporator were evaluated. This model was compared to a physical model whose results were measured in a calibrated calorimeter chamber. Analyses were conducted at full capacity with an outdoor temperature of 35°C and partial capacity at outdoor temperature of 29°C. It was observed that for each test condition, a different capillary tube specification is capable of extracting the best efficiency results from the system. In the full load test, the smallest capillary tube achieved the best energy efficiency, while at partial load, longer capillary tubes allow the system to operate at lower compressor frequencies, resulting in higher efficiency at this point. Thus, it can be observed that a system that could operate with an idealized capillary tube for each of the test conditions could reduce seasonal consumption by up to 2%. Thu, 31 Oct 2024 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13575 2024-10-31T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13563 Continual knowledge distillation for histopathology Rodrigues Neto, João Batista With the emergence of computational pathology, many datasets were made public and challenges were published to encourage researches into developing assistant frameworks for pathology tasks. The analysis of histopathological slides, made by pathologists to detect tumorous cells or metastasis in tissue images, is one of such tasks, for which, computer vision had been successfully applied and even outperformed human expert levels. Despite the excellent results in the literature, the majority of approaches are dataset-dependent and lack generalization, making even the best documented models perform poorly when presented with different tissues. In this work, we designed a novel continuous learning method, that leverages the model generalization across datasets using enhanced knowledge distillation. We verified, through deep and extensive experimentation on 19 datasets, an overall improvement of 15,66% in comparison to common literature methods, and superior metrics in relation to models with full dataset availability. Also, our method was the only one to achieve positive forward (FWT) and backward (BWT) knowledge transfer indexes, considerably mitigating the catastrophic forgetting effect. Mon, 07 Oct 2024 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13563 2024-10-07T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13562 Exploring Artificial Intelligence methods for the automatic measurement of a new biomarker aiming at glaucoma diagnosis Fernandes, Gabriel Castro Fri, 26 Jul 2024 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13562 2024-07-26T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13556 Interação entre visitantes florais e mirtilo (Vaccinium ashei Reade): o efeito da variação da morfologia floral e comportamento de coleta de recurso floral na polinização Santanna, Manoela Thu, 26 Aug 2021 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13556 2021-08-26T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13535 Digital transformation in hospitals: navigating the path to sustainable healthcare Troian, Thomas Andres Fri, 13 Dec 2024 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13535 2024-12-13T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13534 Proposta de um framework para suporte às tomadas de decisões gerenciais sob a ótica da controladoria Nicolodi, Jamile Zanatta The presente paper discusses the management decision-making process from the perspective of the Controllership and with an emphasis on economic and financial results. In addition, it is dedicated to a theoretical analysis of the GECON and TOC management models, seeking to integrate them in a timely manner in the context of the organization under study and the Controllership. The objective of this paper is to present a framework that can be configured as a possible solution to be implemented by the organization in order to obtain more effective managers and, consequently, better decision-makers. The framework presents all the informational and relational chains for the success of the proposal. Artificial Intelligence is cited as a decisive potential for the agility of the data-based decision-making process. The development structure was built based on the Design Science Research method and was applied in Strategic Business Unit 1 of the company under study, which also has 3 other strategic units in Rio Grande do Sul. After the construction of the theoretical artifact, it was presented and discussed with 7 managers of the organization, in order to verify its applicability. The framework was then discussed in a focus group with 6 experts from the field, external to the organization, in order to evaluate it and verify the necessary adjustments. The points generated were considered in full or in part in the creation of a new artifact, presented as the final framework to support management decisions focused on economic results. Mon, 25 Nov 2024 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13534 2024-11-25T00:00:00Z