http://repositorio.ufc.br/handle/riufc/419 Sun, 21 Jun 2026 16:45:40 GMT 2026-06-21T16:45:40Z https://repositorio.ufc.br:443/ri/retrieve/5daf41a9-8fbf-41f7-94c2-7c2fbf7841d9/comunidade_CT-RI-moldurado.jpg http://repositorio.ufc.br/handle/riufc/419 http://repositorio.ufc.br/handle/riufc/86856 Título: Dispositivos lógicos lineares totalmente ópticos em acopladores de fibra de cristal fotônico de três núcleos Autor(es): Rodrigues, João Paulo Teófilo Abstract: The growth in global data traffic and the demand for energy efficiency in Artificial Intelligence training have driven the search for alternatives that overcome the limitations of conventional electronic processing. This reality has led the computer engineering community to revisit paradigms established in recent decades. Traditionally, the premise has been consolidated that all-optical processing strictly requires highly nonlinear media (such as the Kerr effect) or the mediation of optoelectronic devices with successive electro-optic conversions. This work demonstrates a paradigm shift by presenting the analytical design and numerical validation of two all-optical logic devices operating strictly in the linear regime: a multifunctional logic gate and a configurable multifunctional logic device. In both architectures, the fundamental Boolean operations OR and AND are dynamically enabled based on the logic levels input into a selector channel. Each component is structured from a single Photonic Crystal Fiber (PCF) segment composed of three coupled cores, arranged in planar and triangular layouts, respectively. Robust mathematical modeling demonstrates that the control and routing of light states occur purely in the linear regime through coupling guided by the fiber’s geometric design, enabling the processing of ultrashort, low-power pulses with a high contrast ratio via Pulse Amplitude Modulation (PAM). Interconnecting the fundamentals of Applied Electromagnetics and Digital Systems Engineering, this thesis establishes the microstructured design of functional fibers as a viable, high-performance platform for native optical computing. Tipo: Tese Wed, 01 Jan 2025 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/86856 2025-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86855 Título: Estudo da degradação de peneiras moleculares no processo de secagem de gás natural utilizando TSA Autor(es): Cordeiro, Rebecca Cristina Galvão Abstract: Zeolites 4A (LTA) and chabazite (CHA), employed in natural gas dehydration by temperature swing adsorption (TSA), were evaluated regarding their structural stability and adsorptive performance after accelerated aging. The study aimed to correlate thermal degradation, water adsorption capacity, and carbonaceous deposition under conditions representative of industrial regeneration over hundreds of cycles. Adsorption isotherms, kinetic modeling using the linear driving force (LDF) model, textural characterization, and elemental analysis (CHN) were performed. A progressive reduction in equilibrium adsorption capacity (qₘ) was observed with aging, decreasing from 7.9 to 4.0 mmol g⁻¹ for CHA and from 12.3 to 10.8 mmol g⁻¹ for LTA. In contrast, the kinetic coefficient () remained nearly constant, indicating that mass transfer did not constitute the rate-limiting mechanism within the investigated range. CHN analysis revealed progressive coke accumulation, reaching 8.9 wt% for CHA and 1.9 wt% for LTA after 400 cycles, consistent with the reduction in micropore volume. The results demonstrate that the loss of adsorptive performance is predominantly associated with progressive textural degradation and carbonaceous deposition. This work combines, after accelerated aging over hundreds of TSA cycles, detailed textural characterization with a systematic evaluation of the kinetic coefficient for all samples, establishing an integrated correlation among aging, diffusion, and adsorptive response. This approach provides support for predicting the end of service life of molecular sieves, increasing the reliability of natural gas dehydration processes, and guiding the selection of more resistant materials for TSA units. Tipo: Dissertação Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/86855 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86776 Título: Uma abordagem multicritério para a construção de índices globais de desempenho como subsídio à regulação dos serviços hídricos de irrigação Autor(es): Amorim, Eliandro Lima de Abstract: Irrigation accounts for approximately 70% of global freshwater consumption and, in Brazil, for approximately 52% of total use, with Public Irrigation Projects (PPIs) managed by CODEVASF and DNOCS playing a strategic role in the regional development of the Northeast and the São Francisco Valley. Less than half of these projects achieve satisfactory technical efficiency, and the absence of synthetic evaluation instruments restricts benchmarking and performance-based regulation. This study proposes a methodology for constructing global performance indices for irrigation water services, supported by Multi-Criteria Decision Analysis (MCDA) methods. This quantitative, exploratory, and descriptive research analyzed 26 Public-Private Partnerships (PPIs), 20 managed by CODEVASF and 6 by DNOCS, distributed across seven Brazilian states, using data extracted from institutional reports from 2020. Seven indicators comprised the analytical basis: Water Profitability (RA), Water Operational Efficiency (EOA), Financial Insufficiency Index (ISF), Default Rate (IAD), Land Use Index (IUS), Area Profitability (RAR), and Job Creation (GE). Three multi-criteria methods were integrated: PROMETHEE II and TOPSIS with Monte Carlo simulation (1,000 iterations) and TOPSIS with entropy weighting. The projects revealed significant heterogeneity in both economic and operational dimensions, confirming the relevance of the adopted multi-criteria approach. The convergence between the methods proved to be consistent: Sen. Nilo Coelho, Maniçoba, Brumado, and Curaçá stood out as projects of excellence, while Cotinguiba/Pindoba, Boacica, and Estreito systematically occupied the most critical positions. The Pearson correlation r = 0.851 between TOPSIS-MC and TOPSIS-Entropy, combined with the stability of the rankings in the simulations, proved the robustness of the constructed indices. The results demonstrate that the proposed methodological integration converts the complexity of water management into objective and comparable metrics, providing concrete technical support to the regulatory action of ANA and to the advancement of the National Irrigation Policy. Tipo: Dissertação Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/86776 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86745 Título: Controle executivo de estacas raiz a partir de medidas de campo Autor(es): Lima, Diana Rodrigues de; Moura, Alfran Sampaio Abstract: During the execution of the foundations of buildings, the evaluation of the failure load is commonly determined by specific methods, which vary depending on the type of pile. The control of root piles are usually executed by load tests. This paper proposes an empirical formulation for prediction of failure load of root piles, using some variables that are monitored during the execution of the piles, using a digital speedometer. Therefore, slow static load test in three root piles monitored with diameters of 350 to 410 mm were conducted. Several combinations between portions of end bearing load capacity, side friction load capacity, and the monitored variables, were tested using computer programs as Excel and Maple. Afterwards, an equation for the prediction of the failure load of the piles tested was estimated, as a function of the monitored variables, according to polynomial relations, exponential, logarithmic and linear combination, referencing to the value obtained in Van der Veen’s method (1953). It was found that there is a correlation between the failure load and the monitored variables, and the results obtained by the proposed equation were concordant with the reference values for the tested piles. Tipo: Artigo de Periódico Fri, 01 Jan 2016 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/86745 2016-01-01T00:00:00Z