Produção Nacional
Revisado por pares
Filipe Almeida Corrêa do Nascimento, Bruno Gouveia, Felipe da Veiga Dias, Filipe Batista Ribeiro, Marcelino Aurélio Silva,
Decision-making for investments in infrastructure has always proved to be a challenge due to the number of variables to be considered when selecting projects. Specifically, in flexible road pavement works, the methods adopted for this purpose traditionally use technical and economic criteria (nature of materials and execution techniques). However, given the need to optimize the use of natural resources, it is understood the importance that other parameters, such as sustainability, are also used in ...
Tópico(s): Environmental Impact and Sustainability
2020 - Elsevier BV | Journal of Cleaner Production
Salwa R. Al-Taai, Noralhuda M. Azize, Zainab Abdulrdha Thoeny, Hamza Imran, Luís Filipe Almeida Bernardo, Zainab Al-Khafaji,
The construction industry has witnessed a substantial increase in the demand for eco-friendly and sustainable materials. Eco-friendly concrete containing Ground Granulated Blast Furnace Slag (GGBFS) and Recycled Coarse Aggregate (RCA) is such a material, which can contribute to a reduction in waste and promote environmental sustainability. Compressive strength is a crucial parameter in evaluating the performance of concrete. However, predicting the compressive strength of concrete containing GGBFS ...
Tópico(s): Concrete and Cement Materials Research
2023 - Multidisciplinary Digital Publishing Institute | Applied Sciences
Husein Ali Zeini, Duaa Al-Jeznawi, Hamza Imran, Luís Filipe Almeida Bernardo, Zainab Al-Khafaji, Krzysztof Adam Ostrowski,
Unconfined compressive strength (UCS) can be used to assess the applicability of geopolymer binders as ecologically friendly materials for geotechnical projects. Furthermore, soft computing technologies are necessary since experimental research is often challenging, expensive, and time-consuming. This article discusses the feasibility and the performance required to predict UCS using a Random Forest (RF) algorithm. The alkali activator studied was sodium hydroxide solution, and the considered geopolymer ...
Tópico(s): Recycled Aggregate Concrete Performance
2023 - Multidisciplinary Digital Publishing Institute | Sustainability
Farhan Lafta Rashid, Mudhar A. Al‐Obaidi, Anmar Dulaimi, Luís Filipe Almeida Bernardo, Muhammad Asmail Eleiwi, Hameed B. Mahood, Ahmed Hashim,
Most concrete employs organic phase change materials (PCMs), although there are different types available for more specialised use. Organic PCMs are the material of choice for concrete due to their greater heat of fusion and lower cost in comparison to other PCMs. Phase transition materials are an example of latent heat storage materials (LHSMs) that may store or release thermal energy at certain temperatures. A phase transition occurs when a solid material changes from a solid state to a liquid state ...
Tópico(s): Vibration Control and Rheological Fluids
2023 - Multidisciplinary Digital Publishing Institute | Journal of Composites Science
Farhan Lafta Rashid, Mudhar A. Al‐Obaidi, Anmar Dulaimi, Luís Filipe Almeida Bernardo, Zeina Ali Abdul Redha, Hisham A. Hoshi, Hameed B. Mahood, Ahmed Hashim,
Cold thermal energy storage (CTES) based on phase change materials (PCMs) has shown great promise in numerous energy-related applications. Due to its high energy storage density, CTES is able to balance the existing energy supply and demand imbalance. Given the rapidly growing demand for cold energy, the storage of hot and cold energy is emerging as a particularly attractive option. The main purpose of this study is to provide a comprehensive overview of the current research progress on the utilisation ...
Tópico(s): Solar Thermal and Photovoltaic Systems
2023 - Multidisciplinary Digital Publishing Institute | Journal of Composites Science
Zaineb M. Alhakeem, Yasir Mohammed Jebur, Sadiq N. Henedy, Hamza Imran, Luís Filipe Almeida Bernardo, Hussein M. Hussein,
A crucial factor in the efficient design of concrete sustainable buildings is the compressive strength (Cs) of eco-friendly concrete. In this work, a hybrid model of Gradient Boosting Regression Tree (GBRT) with grid search cross-validation (GridSearchCV) optimization technique was used to predict the compressive strength, which allowed us to increase the precision of the prediction models. In addition, to build the proposed models, 164 experiments on eco-friendly concrete compressive strength were ...
Tópico(s): Innovations in Concrete and Construction Materials
2022 - Multidisciplinary Digital Publishing Institute | Materials
Amjed Shatnawi, Hana Mahmood Alkassar, Nadia Moneem Al-Abdaly, Emadaldeen A. Al-Hamdany, Luís Filipe Almeida Bernardo, Hamza Imran,
For the design or assessment of concrete structures that incorporate steel fiber in their elements, the accurate prediction of the shear strength of steel fiber reinforced concrete (SFRC) beams is critical. Unfortunately, traditional empirical methods are based on a small and limited dataset, and their abilities to accurately estimate the shear strength of SFRC beams are arguable. This drawback can be reduced by developing an accurate machine learning based model. The problem with using a high accuracy ...
Tópico(s): Structural Load-Bearing Analysis
2022 - Multidisciplinary Digital Publishing Institute | Buildings
Produção Nacional
Revisado por pares
Filipe Batista Ribeiro, Filipe Almeida Corrêa do Nascimento, Marcelino Aurélio Vieira da Silva,
In response to the growing demand for credit to finance railway projects, portfolios of credit options which use criteria aligned with environmental factors have proved to be an attractive solution. The parameters involve, for example, the commitment to reduce the impact on global warming. Although transportation financing already includes environmental covenants, which are focused mainly on operational aspects, such as rolling stocks, this mechanism is still not applied comprehensively in railway ...
Tópico(s): Asphalt Pavement Performance Evaluation
2022 - Elsevier BV | Journal of Cleaner Production
James Glasbey, Adesoji Ademuyiwa, Adewale Adisa, Ehab Alameer, Alexis Arnaud, Faris Ayasra, José Azevedo, Ana Minaya‐Bravo, Ainhoa Costas‐Chavarri, John Edwards, Muhammed Elhadi, Marco Fiore, Christina Fotopoulou, Gaetano Gallo, Dhruva Ghosh, Ewen A. Griffiths, Ewen M. Harrison, Peter Hutchinson, Ismaïl Lawani, Samuel Lawday, Hans Lederhuber, Sezai Leventoğlu, Elizabeth Li, Gustavo Mendonça Ataíde Gomes, Harvinder Mann, Ella J Marson, Janet Martin, Dennis Mazingi, Kenneth A McLean, María Marta Modolo, Rachel Moore, Dion Morton, Faustin Ntirenganya, Francesco Pata, Maria Picciochi, Peter Pockney, Antonio Ramos‐De la Medina, Keith Roberts, April Camilla Roslani, Rajkumar Kottayasamy Seenivasagam, Richard Shaw, Joana Filipa Ferreira Simões, Neil Smart, Grant D. Stewart, Richard Sullivan, Sudha Sundar, Stephen Tabiri, Elliott H Taylor, Raghavan Vidya, Dmitri Nepogodiev, Aneel Bhangu, James C Glasbey, Kenneth A McLean, Dmitri Nepogodiev, Ewen M. Harrison, Aneel Bhangu, Dmitri Nepogodiev, Kwabena Siaw-Acheampong, Ruth Benson, Edward Bywater, Daoud Chaudhry, Brett E Dawson, Jonathan P Evans, James C Glasbey, Rohan R Gujjuri, Emily Heritage, Conor Jones, Sivesh K. Kamarajah, Chetan Khatri, Rachel A Khaw, James M Keatley, Andrew T. Knight, Samuel Lawday, Elizabeth Li, Harvinder Mann, Ella J Marson, Kenneth A McLean, Siobhan C. McKay, Emily Mills, Gianluca Pellino, Maria Picciochi, Elliott H Taylor, Abhinav Tiwari, Joana F F Simoes, Isobel M Trout, Mary L Venn, Richard Wilkin, Aneel Bhangu, James C Glasbey, Neil Smart, Ana Minaya‐Bravo, Jonathan P Evans, Gaetano Gallo, Susan Moug, Francesco Pata, Peter Pockney, Salomone Di Saverio, Abigail Vallance, Dale Vimalchandran, Ewen A. Griffiths, Sivesh K. Kamarajah, Richard Evans, Philip Townend, Keith Roberts, Siobhan C. McKay, John Isaac, Sohei Satoi, John Edwards, Aman S. Coonar, Adrian Marchbank, Edward Caruana, Georgia R. Layton, Akshay J. Patel, Alessandro Brunelli, Samuel Ford, Anant Desai, Alessandro Gronchi, Marco Fiore, Max Almond, Fabio Tirotta, Sinziana Dumitra, Angelos G. Kolias, Stephen J. Price, Daniel M. Fountain, Michael D. Jenkinson, Peter Hutchinson, Hani J. Marcus, Rory J. Piper, Laura Lippa, Franco Servadei, Ignatius Esene, Christian F. Freyschlag, Iuri Santana Neville, Gail Rosseau, Karl Schaller, Andreas K. Demetriades, Faith C. Robertson, Alexander Alamri, Richard Shaw, Andrew Schache, Stuart C. Winter, Michael Ho, Paul Nankivell, Juan Rey Biel, Martin Batstone, Ian Ganly, Raghavan Vidya, Alex Wilkins, Jagdeep Singh, Dinesh Thekinkattil, Sudha Sundar, Christina Fotopoulou, Elaine Leung, Tabassum Khan, Luis Chiva, Jalid Sehouli, Anna Fagotti, Paul A. Cohen, Murat Gutelkin, Rahel Ghebre, Thomas O. Konney, René Pareja, R.E. Bristow, Sean C. Dowdy, TS Shylasree, Rajkumar Kottayasamy Seenivasagam, Joe Ng, Keiichi Fujiwara, Grant D. Stewart, Benjamin W. Lamb, Krishna Narahari, Alan McNeill, Alexandra J. Colquhoun, John McGrath, Steve Bromage, Ravi Barod, Veeru Kasivisvanathan, Tobias Klatte, Joana F F Simoes, Tom Abbott, Sadi A. Abukhalaf, Michel Adamina, Adesoji Ademuyiwa, Arnav Agarwal, Murat Akkulak, Ehab Alameer, Derek Alderson, Felix Alakaloko, Markus Albertsmeier, Osaid Alser, Muhammad Alshaar, Sattar Alshryda, Alexis Arnaud, Knut Magne Augestad, Faris Ayasra, José Azevedo, Brittany Bankhead-Kendall, Emma Barlow, David Beard, Ruth Benson, Ruth Blanco‐Colino, Amanpreet Brar, Ana Minaya‐Bravo, Kerry Breen, Chris Bretherton, Igor Lima Buarque, Josh Burke, Edward Caruana, Mohamad K. Abou Chaar, Sohini Chakrabortee, Peter Christensen, Daniel Cox, Moisés Cukier, Miguel F Cunha, Giana H. Davidson, Anant Desai, Salomone Di Saverio, Thomas M Drake, John Edwards, Muhammed Elhadi, Sameh Hany Emile, Shebani Farik, Marco Fiore, J.E.F. Fitzgerald, Samuel Ford, Tatiana Garmanova, Gaetano Gallo, Dhruva Ghosh, Gustavo Mendonça Ataíde Gomes, Gustavo Grecinos, Ewen A. Griffiths, Magdalena Gruendl, Constantine Halkias, Ewen M. Harrison, Intisar Hisham, Peter Hutchinson, Shelley Hwang, Arda Işık, Michael D. Jenkinson, Pascal Jonker, Haytham M.A. Kaafarani, Debby Keller, Angelos G. Kolias, Schelto Kruijff, Ismaïl Lawani, Hans Lederhuber, Sezai Leventoğlu, Andrey Litvin, Andrew P. Loehrer, Markus Löffler, Maria Aguilera Lorena, María Marta Modolo, Piotr Major, Janet Martin, Hassan Mashbari, Dennis Mazingi, Symeon Metallidis, Ana Minaya‐Bravo, Helen Mohan, Rachel Moore, David Moszkowicz, Susan Moug, Joshua S Ng-Kamstra, Mayaba Maimbo, Ionuț Negoi, Milagros Niquen-Jimenez, Faustin Ntirenganya, Maricarmen Olivos, Salah Eddine Oussama Kacimi, Oumaima Outani, Marie Dione Parreno-Sacdalanm, Francesco Pata, Carlos J. Pérez-Rivera, Thomas Pinkney, Willemijn Y. van der Plas, Peter Pockney, Ahmad Uzair Qureshi, Dejan Radenković, Antonio Ramos‐De la Medina, Toby Richards, Keith Roberts, April Camilla Roslani, Martin Rutegård, Juan José Segura‐Sampedro, Irène Santos, Sohei Satoi, Raza Sayyed, Andrew Schache, Andreas A. Schnitzbauer, Justina O. Seyi‐Olajide, Neil Sharma, Catherine A. Shaw, Richard Shaw, Sebastian Shu, Kjetil Søreide, Antonino Spinelli,
BackgroundSurgery is the main modality of cure for solid cancers and was prioritised to continue during COVID-19 outbreaks. This study aimed to identify immediate areas for system strengthening by comparing the delivery of elective cancer surgery during the COVID-19 pandemic in periods of lockdown versus light restriction.MethodsThis international, prospective, cohort study enrolled 20 006 adult (≥18 years) patients from 466 hospitals in 61 countries with 15 cancer types, who had a decision for curative ...
Elsevier BV
Helena Ramos, Maria I. L. Soares, Joana Silva, Liliana Raimundo, Juliana Calheiros, Célia Gomes, Flávio Reis, Filipe Almeida Monteiro, Cláudia Nunes, Salette Reis, Bartolomeo Bosco, Silvano Piazza, Lucı́lia Domingues, Petr Chlapek, Petr Vlček, Pavel Fabián, Ana Teresa Rajado, Alexandra T. P. Carvalho, Renata Veselská, Alberto Inga, Teresa M. V. D. Pinho e Melo, Lucı́lia Saraiva,
Impairment of the p53 pathway is a critical event in cancer. Therefore, reestablishing p53 activity has become one of the most appealing anticancer therapeutic strategies. Here, we disclose the p53-activating anticancer drug (3S)-6,7-bis(hydroxymethyl)-5-methyl-3-phenyl-1H,3H-pyrrolo[1,2-c]thiazole (MANIO). MANIO demonstrates a notable selectivity to the p53 pathway, activating wild-type (WT)p53 and restoring WT-like function to mutant (mut)p53 in human cancer cells. MANIO directly binds to the WT/mutp53 ...
Tópico(s): Biochemical and Molecular Research
2021 - Cell Press | Cell Reports
Miguel Nepomuceno, Luís Filipe Almeida Bernardo, Luiz António Pereira de Oliveira, Rúben O. Timóteo,
This article reports an experimental research on the influence of high-volume mineral additions on the rheological, physical and mechanical properties of cement-based grout for stone masonry structures consolidation. Binary grout mixtures were produced by replacing 50% weight of cement by limestone filler, metakaolin, glass powder and ceramic waste. Grout flow properties, rheological parameters, bleeding water, bulk density and injectability were evaluated. Grout physical and mechanical properties ...
Tópico(s): Innovative concrete reinforcement materials
2021 - Elsevier BV | Construction and Building Materials
Tiago Ribeiro, Luís Filipe Almeida Bernardo, Jorge Miguel de Almeida Andrade,
Topology Optimisation is a broad concept deemed to encapsulate different processes for computationally determining structural materials optimal layouts. Among such techniques, Discrete Optimisation has a consistent record in Civil and Structural Engineering. In contrast, the Optimisation of Continua recently emerged as a critical asset for fostering the employment of Additive Manufacturing, as one can observe in several other industrial fields. With the purpose of filling the need for a systematic ...
Tópico(s): BIM and Construction Integration
2021 - Multidisciplinary Digital Publishing Institute | Applied Sciences
Ana L. Gonçalves, Filipe Almeida, Fernando Rocha, António Ferreira,
Although very promising, the use of microalgae for CO2 capture still faces some limitations. Due to the low solubility of this gas in the liquid medium, poor CO2 utilisation efficiencies by microalgae are very common, resulting in low CO2 fixation rates and CO2 losses to the atmosphere. Considering this limitation, several researchers have focused on improving photobioreactor (PBR) design to increase CO2 gas-liquid mass transfer rates. However, these systems typically rely on high fluid turbulence ...
Tópico(s): Algal biology and biofuel production
2021 - Elsevier BV | Journal of environmental chemical engineering
Produção Nacional
Revisado por pares
Filipe Almeida Corrêa do Nascimento, Antônio Carlos Rodrigues Guimarães, Carmen Dias Castro,
For an asphalt mixture to present rutting resistance, it must have a high shear strength. In an abbreviated protocol, the shear strength of an asphalt mixture can be estimated in the laboratory through the indirect tensile (IDT) strength test and the unconfined compression test, using the Mohr-Coulomb failure theory. So, taking advantage of the simplicity of the IDT test, this research investigated whether the other relationships between stress and strain, derived from the indirect tensile strength ...
Tópico(s): Geotechnical Engineering and Underground Structures
2021 - Elsevier BV | Construction and Building Materials
Felisberto Pereira, Hugo Sampaio, Ricardo Chaves, Ricardo Correia, Miguel Luıs, Susana Sargento, Marina Jordão, Luís Filipe Almeida, Carlos Senna, Arnaldo S. R. Oliveira, Nuno Borges Carvalho,
The research of safety applications in vehicular networks has been a popular research topic in an effort to reduce the number of road victims. Advances on vehicular communications are facilitating information sharing through real time communications, critical for the development of driving assistance systems. However, the communication by itself is not enough to reach the most desired target as we need to know which safety-related information should be disseminated. In this work, we bring passive ...
Tópico(s): UAV Applications and Optimization
2020 - Institute of Electrical and Electronics Engineers | IEEE Access
Luís Filipe Almeida Bernardo, Jorge Miguel de Almeida Andrade,
A recent analytical model based on refinement of the Variable Angle Truss Model (VATM) and called Generalized Softened Variable Angle Truss-Model (GSVATM) was proposed in previous articles to predict the full response of reinforced concrete (RC) and prestressed concrete (PC) beams (solid and hollow) under torsion. The GSVATM is reformulated here in a unified form and used to illustrate some calculation examples related to RC and PC beams under torsion. It is shown that the unified GSVATM can provide ...
Tópico(s): Structural Load-Bearing Analysis
2020 - Elsevier BV | Journal of Building Engineering
Recently, an analytical model called the generalized softened variable angle truss-model (GSVATM) aimed to predict the full behavior of reinforced concrete (RC) rectangular beams under torsion. In this article, such a model is used to compute the full torsional behavior of RC flanged beams, namely T- and L-shaped beams. The calculation procedure to include the influence of the flanges is described. A comparative analysis between the predictions from the GSVATM and some experimental results, related ...
Tópico(s): Seismic Performance and Analysis
2019 - Multidisciplinary Digital Publishing Institute | Applied Sciences
Ângelo Filipe Almeida Monteiro, Silvia Colomban, Helena G. Azinheira, Leonor Guerra‐Guimarães, Maria do Céu Silva, Luciano Navarini, Marina Resmini,
Natural polyphenols are important dietary antioxidants that significantly benefit human health. Coffee and tea have been shown to largely contribute to the dietary intake of these antioxidants in several populations. More recently, the use of coffee leaves to produce tea has become a potential commercial target, therefore prompting studies on the quantification of polyphenols in coffee leaves. In this study a variety of coffee leaf species, at different development stages, were analyzed using ultra- ...
Tópico(s): Phytochemicals and Antioxidant Activities
2019 - Multidisciplinary Digital Publishing Institute | Antioxidants
Miguel Nepomuceno, Luís Filipe Almeida Bernardo,
Self-compacting concrete (SCC) shows to have some specificities when compared to normal vibrated concrete (NVC), namely higher cement paste dosage and smaller volume of coarse aggregates. In addition, the maximum size of coarse aggregates is also reduced in SCC to prevent blocking effect. Such specificities are likely to affect the results of non-destructive tests when compared to those obtained in NVC with similar compressive strength and materials. This study evaluates the applicability of some ...
Tópico(s): Ultrasonics and Acoustic Wave Propagation
2019 - Multidisciplinary Digital Publishing Institute | Applied Sciences
Produção Nacional
Revisado por pares
Svetoslav Nanev Slavov, Daiani Cristina Cilião‐Alves, Filipe Almeida Carvalho Gonzaga, Drielly Rodrigues Moura, Ana Carolina Alves Melo de Moura, Lorena Aparecida Gonçalves de Noronha, Évelin Mota Cassemiro, Bárbara Maciel Sidou Pimentel, Fabiano José Queiroz Costa, Grasiela Araújo da Silva, Doralina do Amaral Rabello Ramos, Wildo Navegantes de Araújo, Simone Kashima, Rodrigo Haddad,
Dengue virus (DENV) transmission by blood transfusion is an important route of viral acquisition during outbreaks. The prevalence of DENV markers (viral RNA, NS1, anti-DENV IgM, and IgG) among blood donors in Central-West Brazil has never been evaluated. Our aim was to evaluate the full set of serological and molecular markers for DENV among blood donors of the Federal District of Brazil during an extensive outbreak in 2016. We found an anti-DENV IgM prevalence of 6.74% (n = 32/475). Of 475, 20 samples ( ...
Tópico(s): Malaria Research and Control
2019 - Public Library of Science | PLoS ONE
Irene Gullo, Vítor Devezas, Manuela Baptista, Luzia Garrido, Sérgio Castedo, Rui Morais, Xiaogang Wen, Elisabete Rios, Jorge Pinheiro, Inês Pinto-Ribeiro, Rui M. Ferreira, John Preto, João Santos‐Antunes, Margarida Marques, Miquel Campos, Filipe Almeida, Maria do Céu Espinheira, Jorge Amil Dias, Céu Figueiredo, Carla Oliveíra, Eunice Trindade, Fátima Carneiro,
The time course for the development of clinically significant hereditary diffuse gastric cancer (HDGC) is unpredictable. Little is known about the progression from preclinical, indolent lesions to widely invasive, aggressive phenotypes. Gastroendoscopy often fails to detect early lesions, and risk-reducing/prophylactic total gastrectomy (PTG) is the only curative approach. We present an HDGC family with early-onset disease in which clinical and histologic findings provided insight into the understanding ...
Tópico(s): Genetic factors in colorectal cancer
2018 - Elsevier BV | Gastrointestinal Endoscopy
Filipe Almeida, Vítor M. C. F. Cunha, Tiago Miranda, Nuno Cristelo,
There are currently still some sustainability-related issues that need to be tackled within the construction sector. Namely, cement production is accountable for nearby 5% of the worldwide total CO2-eq release. Therefore, environmentally viable and economically sustainable solutions need to be pursued in order to mitigate the use of Portland cement. The incorporation of industrial waste in concrete compositions, such as fly ash (from coal combustion in power stations) is a feasible alternative. The ...
Tópico(s): Advanced ceramic materials synthesis
2018 - Multidisciplinary Digital Publishing Institute | Fibers
Luís Filipe Almeida Bernardo, Mafalda Teixeira,
This article presents a computation procedure developed to predict the global behaviour of prestressed concrete (PC) beams under pure torsion. This computation procedure constitutes an extension of a theoretical model previously proposed, the Modified Variable Angle Truss-Model (MVATM) for Reinforced Concrete (RC) beams under torsion. The modifications incorporated in the MVATM and the calculation procedure are presented. The obtained theoretical predictions are compared with experimental results available ...
Tópico(s): Seismic Performance and Analysis
2018 - Elsevier BV | Journal of Building Engineering
Mafalda Teixeira, Luís Filipe Almeida Bernardo,
In this article, the torsional ductility of reinforced concrete (RC) beams with rectangular cross section is studied. For this, the experimental results of several RC beams found in the literature were compiled and analyzed. A torsional ductility index was used to characterize the torsional ductility of the studied beams. The following variables study were considered: compressive concrete strength, torsional reinforcement ratio and cross section type (plain or hollow). The influence of each variable ...
Tópico(s): Structural Engineering and Materials Analysis
2018 - Elsevier BV | Engineering Structures
Filipe Almeida, Maria Pequito Luís, Inês Serrano Pereira, Sara V. Pais, Luı́s Jaime Mota,
Chlamydia trachomatis is an obligate intracellular human pathogen causing mainly ocular and genital infections of significant clinical and public health impact. C. trachomatis multiplies intracellularly in a membrane bound vacuole, known as inclusion. Both extracellularly and from within the inclusion, C. trachomatis uses a type III secretion system to deliver several effector proteins into the cytoplasm of host cells. A large proportion of these effectors, the inclusion membrane (Inc) proteins, ...
Tópico(s): Urinary Bladder and Prostate Research
2018 - Frontiers Media | Frontiers in Cellular and Infection Microbiology
Anggy Lusanna Gutiérrez Ortiz, Federico Berti, Luciano Navarini, Ângelo Filipe Almeida Monteiro, Marina Resmini, Cristina Forzato,
The synthesis of four isomers of p-coumaroylquinic acids was performed by esterification of p-acetylcoumaroylchloride with a suitably protected (−)-quinic acid. All isomers have been characterized by means of NMR spectroscopy and circular dichroism. Acyl migration was observed in the synthesis of 3-O-p-coumaroylquinic acid and 4-O-p-coumaroylquinic acid. Calculations on the most stable conformations of all isomers have also been performed to explain the acyl migration observed during the synthesis procedure.
Tópico(s): Fermentation and Sensory Analysis
2017 - Elsevier BV | Tetrahedron Asymmetry
Ana M. Amaro, Luís Filipe Almeida Bernardo, Deesy G. Pinto, Sérgio M.R. Lopes, João Rodrigues,
This study investigates the impact properties (impact strength (IS) and impact energy (IE)) of epoxy resin nanocomposites (EPNCs) manufactured with different curing agents and reinforced with alumina nanoparticles (NPs). The NPs consisted on alpha alumina with irregular shapes (100 nm maximum size) pretreated with a silane agent. The weight fractions of alumina NPs were 1, 3 and 5 wt(%). Two different epoxy (EP) resins were studied and compared. The first one was cured and post cured with bis (4-aminophenyl) ...
Tópico(s): Mechanical Behavior of Composites
2017 - Elsevier BV | Composite Structures
Jordlly R. B. Silva, Bernardo Horowitz, Luís Filipe Almeida Bernardo,
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Tópico(s): Structural Engineering and Vibration Analysis
2017 - American Concrete Institute | ACI Structural Journal
Luís Filipe Almeida Bernardo, Ana M. Amaro, Deesy G. Pinto, Sérgio M.R. Lopes,
The present review article aims at summarizing some recent advances in modeling polymer nanoparticle composites (PNCs) reinforced with nanoparticles (NPs), having different sizes and shapes. They are added to a polymer matrix (PM) following a given selected fraction (e.g., in terms of volume fraction (VF)). In order to gain a deeper insight to model the mechanical properties of PNCs, the research teams have been modifying the existing micromechanics models (i.e. for two-phased PNCs) and finite element ...
Tópico(s): Composite Material Mechanics
2016 - Elsevier BV | Computational Materials Science
Luís Filipe Almeida Bernardo, Miguel Nepomuceno, Hugo Alexandre Silva Pinto,
This paper describes an experimental study on the flexural ductility of lightweight-aggregate concrete beams including concretes with compressive strengths between 22.0 and 60.4 MPa and dry densities between 1651 and 1953 kg/m3. Nineteen simply supported beams were tested until failure. Two symmetrical concentrated loads were applied at approximately one third of the span. Ductility was studied by defining ductility indexes. The main variables are the concrete compressive strength and the longitudinal ...
Tópico(s): Structural Load-Bearing Analysis
2016 - Taylor & Francis | Journal of Civil Engineering and Management