http://repositorio.ufc.br/handle/riufc/419 2026-04-30T02:53:42Z http://repositorio.ufc.br/handle/riufc/86092 Título: Fatores intervenientes no comportamento de motociclistas quanto à velocidade: um estudo sob a ótica da teoria do comportamento planejado estendida Autor(es): Matos, André Luis Barcelos Abstract: The intensive use of motorcycles has increased traffic fatality rates, especially in countries such as Brazil. Among the risk factors, speed choice stands out. Understanding the elements that influence this decision is essential for planning road safety actions. This study aims to identify the factors influencing motorcyclists' intention to comply with speed limits, using the Extended Theory of Planned Behavior (TPB). A risk perception construct was included to reflect motorcyclists’ intuitive judgments about the consequences of speeding. Furthermore, the influence of gender and motorcycle use in the TPB framework was also investigated. To this end, the Motorcyclist Speed Compliance Questionnaire (MSCQ) was developed, based on the study of salient local beliefs and applied to a sample of 358 motorcyclists in Fortaleza City, Brazil. The consolidated psychometric instrument was used to test a set of hypotheses using Structural Equation Models. The results showed the strong effect of perceived behavioral control and attitude on the intention to comply with speed, as well as the central role of risk perception on attitude and perceived behavioral control. It also appears that, at least for the Fortaleza city scenario, peer influence plays an indirect role in motorcyclists speed compliance. Based on the hypothesis testing and the final TPB/SEM analysis, several safety interventions were recommended. Tipo: Dissertação 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86082 Título: Desenvolvimento e caracterização de membranas de colágeno/ quitosana /apatita de estrôncio para aplicações em regeneração óssea Autor(es): Musse, Arthur Crhistyan Nicolau Abstract: Bone regeneration, especially in critical defects, represents one of the greatest challenges in contemporary medicine, as there is still a lack of affordable biomaterials that combine mechanical, biological, and functional properties within a single platform. This study developed and characterized membranes composed of marine collagen (extracted from tuna skin), chitosan, and strontium apatite gel, designed for applications in bone tissue engineering. The membranes exhibited a porous structure (>70 µm), favorable for cell adhesion and proliferation. Antimicrobial assays revealed significant inhibition of Staphylococcus aureus and Escherichia coli, achieving reductions of 70% and 45%, respectively compared to the control. In cytotoxicity tests, the formulation containing 2% collagen, 2% chitosan, and 1% strontium apatite gel showed the best results, with cell viability 28.4% higher than the control group. Bioactivity studies confirmed the formation of mineral deposits on the membrane surfaces, while degradability tests indicated a mass loss of less than 52% over 90 days. Furthermore, the strontium release analysis demonstrated a gradual and sustained profile throughout the 90-day period. Overall, the results demonstrate that the developed membranes exhibit promising physicochemical, biological, and functional properties for guided bone regeneration applications. However, further mechanical and in vivo studies are recommended to confirm their performance and clinical potential. Tipo: Dissertação 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86080 Título: Utilização do pressiômetro de Ménard no estudo das areias carbonáticas do litoral Cearense Autor(es): Nascimento, Matheus Vasconcelos do Abstract: This research investigates the stress-strain behavior of carbonate sands subjected to the Ménard pressuremeter test, aiming to determine representative geotechnical parameters for these atypical soils. The research was developed on marine sands with different carbonate contents, typical of coastal environments in Northeast Brazil, whose structure and cementation influence the mechanical response of the soil. The study is situated within the context of the expansion of offshore wind energy in the country, seeking to provide technical support for the safe and economical design of foundations on carbonate sandy soils. Ménard pressuremeter tests were carried out on the beaches of Moitas, in Amontada/CE, and on the beaches of Caiçara, Redonda and Retiro Grande, in Icapuí/CE. These tests allowed for the determination of deformability parameters (EM, E, G) and resistance parameters (σh0, Pf, Pl e φ’). The variation of these parameters with depth and carbonate content in the samples was analyzed to understand a possible influence of mineralogical composition on the stress-strain response of the soils. The parameters obtained were applied to estimate the bearing capacity and settlements of an offshore gravity wind turbine foundation, based on established analytical methodologies and comparisons with predictions derived from SPT soundings. The results preliminarily indicated that increasing the carbonate content tends to increase the initial stiffness and ultimate strength, reflecting in higher values of pressuremeter modulus and ultimate pressure. The bearing capacity predictions based on the pressuremeter test were, on average, lower than those obtained by SPT, highlighting the obtaining of more conservative predictions when using PMT tests on the investigated carbonate sands. It is concluded that the Ménard Pressuremeter is an effective tool in evaluating the deformability and strength of carbonate sands, especially for the design of offshore gravity foundations. Given the specific conditions of the region studied, this type of foundation proves to be technically viable for the installation of wind turbines. The study not only expands knowledge about the behavior of these soils, but also confirms the relevance of disseminating pressuremeter testing in regional and national geotechnical scenarios. Tipo: Dissertação 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86053 Título: Montagem e teste de uma unidade experimental para estudo de envelhecimento de materiais adsorventes utilizados no processo de secagem do gás natural Autor(es): Sousa, Mikaelly Cabral de Abstract: Natural gas has emerged as an important global energy source due to its role in the energy transition process in several countries, as well as its lower carbon emissions when compared to other fossil fuels, contributing to mitigating the environmental impacts associated with their use. Several institutions, such as the International Energy Agency (IEA) and the European Union through the European Green Deal, aim to reduce and neutralize the effects of climate change by 2050, establishing targets to reduce greenhouse gas emissions by at least 55% by 2030. In Brazil, approximately 60% of the energy produced comes from hydroelectric generation; however, the use of natural gas has been increasing due to the expansion of national reserves. For commercialization, natural gas must undergo several purification steps, including water removal, since the presence of moisture during transportation can promote corrosive processes and the formation of hydrates, which may obstruct pipelines and compromise the integrity of the ducts. In this context, natural gas dehydration becomes a critical step to enable its transportation and commercialization. This work aims to develop and evaluate a laboratory-scale protocol for natural gas drying using Temperature Swing Adsorption (TSA), considering operational parameters such as feed flow rate, regeneration temperature, particle size of the adsorbent material, and operating time. These parameters were analyzed through breakthrough curves monitored by dew point temperature (DPT) sensors. The results demonstrated that the LTA 4A zeolite presents high affinity for water vapor, predominantly microporous structure, and adequate thermal stability for successive adsorption–regeneration cycles under the evaluated conditions. The analysis of operational variables allowed the definition of reproducible experimental conditions, highlighting a feed flow rate of 80 mL·min⁻¹ and thermal regeneration at 250 °C with a heating rate of 5 °C min⁻¹ as suitable parameters to ensure process efficiency and operational stability. The water vapor adsorption capacity obtained in dynamic tests showed good agreement with the values determined from equilibrium isotherms, and the initial aging cycles did not indicate significant loss of material performance. Therefore, the results demonstrate that the developed experimental system can be used to study the aging of adsorbent materials in fixed-bed systems. Tipo: Dissertação 2026-01-01T00:00:00Z