Search results for: S. Fraga

Items from 1 to 20 out of 96 results

article

On the Use of Online Reparametrization in Automated Platforms for Kinetic Model Identification

Marco Quaglio, Conor Waldron, Arun Pankajakshan, Enhong Cao, more

Chemie Ingenieur Technik > 91 > 3 > 268 - 276

Parameter estimation algorithms integrated in automated platforms for kinetic model identification are required to solve two optimization problems: i) a parameter estimation problem given the available samples; ii) a model‐based design of experiments problem to select the conditions for collecting future samples. These problems may be ill‐posed, leading to numerical failures when optimization routines...

article

Adapting the bioblitz to meet conservation needs

Sophie S. Parker, Gregory B. Pauly, James Moore, Naomi S. Fraga, more

Conservation Biology > 32 > 5 > 1007 - 1019

When conservation strategies require new, field‐based information, practitioners must find the best ways to rapidly deliver high‐quality survey data. To address this challenge, several rapid‐assessment approaches have been developed since the early 1990s. These typically involve large areas, take many months to complete, and are not appropriate when conservation‐relevant survey data are urgently needed...

article

On the application of a nature-inspired stochastic evolutionary algorithm to constrained multi-objective beer fermentation optimisation

Alistair D. Rodman, Eric S. Fraga, Dimitrios Gerogiorgis

Computers & Chemical Engineering > 2018 > 108 > C > 448-459

Fermentation is an essential step in beer brewing, often acting as the system bottleneck due to the time-consuming nature of the process stage (duration >120h), where a trade-off exists between attainable ethanol concentration and required batch time. To explore this trade-off we employ a multi-objective plant propagation algorithm (the Strawberry algorithm), for identifying temperature manipulations...

article

Corrigendum to “Thermal degradation kinetics of anthocyanins extracted from juçara (Euterpe edulis Martius) and “Italia” grapes (Vitis vinifera L.), and the effect of heating on the antioxidant capacity” [Food Chem. 232 (2017) 836–840]

D.V. Peron, S. Fraga, F. Antelo

Food Chemistry > 2017 > 237 > C > 1237

article

Distribution of Amyloid‐Like and Oligomeric Species from Protein Aggregation Kinetics

Alexandra Silva, Bruno Almeida, Joana S. Fraga, Pablo Taboada, more

Angewandte Chemie International Edition > 56 > 45 > 14042 - 14045

Amyloid fibrils and soluble oligomers are two types of protein aggregates associated with neurodegeneration. Classic therapeutic strategies try to prevent the nucleation and spread of amyloid fibrils, whilst diffusible oligomers have emerged as promising drug targets affecting downstream pathogenic processes. We developed a generic protein aggregation model and validate it against measured compositions...

article

Distribution of Amyloid‐Like and Oligomeric Species from Protein Aggregation Kinetics

Alexandra Silva, Bruno Almeida, Joana S. Fraga, Pablo Taboada, more

Angewandte Chemie > 129 > 45 > 14230 - 14233

article

Process optimization for zero-liquid discharge desalination of shale gas flowback water under uncertainty

Viviani C. Onishi, Rubén Ruiz-Femenia, Raquel Salcedo-Díaz, Alba Carrero-Parreño, more

Journal of Cleaner Production > 2017 > 164 > C > 1219-1238

Sustainable and efficient desalination is required to treat the large amounts of high-salinity flowback water from shale gas extraction. Nevertheless, uncertainty associated with well data (including water flowrates and salinities) strongly hampers the process design task. In this work, we introduce a new optimization model for the synthesis of zero-liquid discharge (ZLD) desalination systems under...

article

Thermal degradation kinetics of anthocyanins extracted from juçara (Euterpe edulis Martius) and “Italia” grapes (Vitis vinifera L.), and the effect of heating on the antioxidant capacity

D.V. Peron, S. Fraga, F. Antelo

Food Chemistry > 2017 > 232 > C > 836-840

The effect of temperature on the degradation of anthocyanins in juçara and “Italia” grape extracts was determined between 50 and 90°C. For both species, thermal degradation followed a first-order kinetic model. The decimal reduction time decreased with increasing temperature, and dependence on the thermodegradable factor was lower at higher temperatures. The anthocyanins from juçara degraded more...

article

On the design of complex energy systems: Accounting for renewables variability in systems sizing

Oluwamayowa O. Amusat, Paul R. Shearing, Eric S. Fraga

Computers & Chemical Engineering > 2017 > 103 > C > 103-115

The variability challenge inherent in the design and sizing of stand-alone renewables-based energy systems incorporating storage is addressed at the design stage. The framework developed for reliability evaluation combines the stochastic modelling of renewable resources with chronological simulation of energy system performance for the evaluation of system reliability. The effect of inter-year variability...

article

CAD/CAM machining Vs pre-sintering in-lab fabrication techniques of Y-TZP ceramic specimens: Effects on their mechanical fatigue behavior

C.P. Zucuni, L.F. Guilardi, S. Fraga, L.G. May, more

Journal of the Mechanical Behavior of Biomedical Materials > 2017 > 71 > C > 201-208

This study evaluated the effects of different pre-sintering fabrication processing techniques of Y-TZP ceramic (CAD/CAM Vs. in-lab), considering surface characteristics and mechanical performance outcomes. Pre-sintered discs of Y-TZP ceramic (IPS e.max ZirCAD, Ivoclar Vivadent) were produced using different pre-sintering fabrication processing techniques: Machined- milling with a CAD/CAM system; Polished-...

article

A multi-objective framework for cost-unavailability optimisation of residential distributed energy system design

Carmen Wouters, Eric S. Fraga, Adrian M. James

Sustainable Energy, Grids and Networks > 2017 > 9 > Complete > 104-117

Future energy systems are expected to include distributed energy systems (DES) and microgrids (MG) at the distribution level. These energy efficient environments enable participating consumers to locally generate and share both electrical and thermal energy. Apart from the potential for a more cost-efficient energy system design, improved system availability is also increasingly put forward as a major...

article

Shale gas flowback water desalination: Single vs multiple-effect evaporation with vapor recompression cycle and thermal integration

Viviani C. Onishi, Alba Carrero-Parreño, Juan A. Reyes-Labarta, Rubén Ruiz-Femenia, more

Desalination > 2017 > 404 > C > 230-248

This paper introduces a new optimization model for the single and multiple-effect evaporation (SEE/MEE) systems design, including vapor recompression cycle and thermal integration. The SEE/MEE model is specially developed for shale gas flowback water desalination. A superstructure is proposed to solve the problem, comprising several evaporation effects coupled with intermediate flashing tanks that...

article

Desalination of shale gas produced water: A rigorous design approach for zero-liquid discharge evaporation systems

Viviani C. Onishi, Alba Carrero-Parreño, Juan A. Reyes-Labarta, Eric S. Fraga, more

Journal of Cleaner Production > 2017 > 140 > P3 > 1399-1414

Shale gas has recently emerged as a promising energy source to face the increasing global demand. This paper introduces a new rigorous optimization model for the simultaneous synthesis of single and multiple-effect evaporation (SEE/MEE) systems, considering mechanical vapor recompression (MVR) and energy recovery. The proposed model has been especially developed for the desalination of high-salinity...

article

Optimal integrated energy systems design incorporating variable renewable energy sources

Oluwamayowa O. Amusat, Paul R. Shearing, Eric S. Fraga

Computers & Chemical Engineering > 2016 > 95 > C > 21-37

The effect of variability in renewable input sources on the optimal design and reliability of an integrated energy system designed for off-grid mining operation is investigated via a two-stage approach. Firstly, possible energy system designs are generated by solving a deterministic non-linear programming (NLP) optimization problem to minimize the capital cost for a number of input scenarios. Two...

chapter

A fuzzy linear approach to recognising signal profiles

P. Félix, S. Fraga, R. Marín, S. Barrot

Lecture Notes in Computer Science > Methodology and Tools in Knowledge-Based Systems > 677-686

In other papers we have introduced the model of Fuzzy Temporal Profile (FTP) [4] through which we describe the evolution of a particular physical parameter V over time. Following this model an approximation to the evolution curve by means of sections between a set of significant points (X ₀,X ₁,...,X _n) is defined. Each section is defined by way of an imprecise constraint...

article

Toxicity of gold nanorods on zebrafish (Danio rerio) embryos

B.S. Mesquita, S. Fraga, A.M. Simões, I. Lopes, more

Toxicology Letters > 2016 > 259 > S > S189

article

The effect of grinding on the mechanical behavior of Y-TZP ceramics: A systematic review and meta-analyses

G.K.R. Pereira, S. Fraga, A.F. Montagner, F.Z.M. Soares, more

Journal of the Mechanical Behavior of Biomedical Materials > 2016 > 63 > C > 417-442

The aim of this study was to systematically review the literature to assess the effect of grinding on the mechanical properties, structural stability and superficial characteristics of Y-TZP ceramics. The MEDLINE via PubMed and Web of Science (ISI – Web of Knowledge) electronic databases were searched with included peer-reviewed publications in English language and with no publication year limit....

article

Are posts necessary for the restoration of root filled teeth with limited tissue loss? A structured review of laboratory and clinical studies

I. L. Aurélio, S. Fraga, M. P. Rippe, L. F. Valandro

International Endodontic Journal > 49 > 9 > 827 - 835

Guidelines for post placement are lacking in respect of the amount of tooth structure, particularly in cases in which ≥50% of coronal structure is preserved. The aim of this review was to provide evidence‐based principles for the use of posts in the restoration of root filled teeth with limited tissue loss. A literature search of laboratory and clinical studies published between 2000 and 2014 was...

chapter

Quantum chemical studies on the submolecular structure of the nucleic acids

S. Fraga, C. Valdemoro

Structure and Bonding > Structure and Bonding > 1-62

chapter

A Hierarchical Pattern Matching Procedure for Signal Abstraction

A. Otero, P. Félix, S. Fraga, S. Barro, more

Lecture Notes in Computer Science > Current Topics in Artificial Intelligence > Selected Papers from the 11th Conference of the Spanish Association for Artificial Intelligence (CAEPIA 2005) > 31-41

The Multivariable Fuzzy Temporal Profile model enables human experts to project their knowledge of a signal pattern, described over a set of parameters, into a computable description. Here it is endowed with a hierarchical capability through the definition of algorithms that recognize a set of findings over a signal, and aggregate them into a set of abstraction levels. We also present a heuristics...

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Revista Portuguesa de Pneumologia (English Edition) (1)
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INFONA - science communication portal

Search results for: S. Fraga

On the Use of Online Reparametrization in Automated Platforms for Kinetic Model Identification

Adapting the bioblitz to meet conservation needs

On the application of a nature-inspired stochastic evolutionary algorithm to constrained multi-objective beer fermentation optimisation

Corrigendum to “Thermal degradation kinetics of anthocyanins extracted from juçara (Euterpe edulis Martius) and “Italia” grapes (Vitis vinifera L.), and the effect of heating on the antioxidant capacity” [Food Chem. 232 (2017) 836–840]

Distribution of Amyloid‐Like and Oligomeric Species from Protein Aggregation Kinetics

Distribution of Amyloid‐Like and Oligomeric Species from Protein Aggregation Kinetics

Process optimization for zero-liquid discharge desalination of shale gas flowback water under uncertainty

Thermal degradation kinetics of anthocyanins extracted from juçara (Euterpe edulis Martius) and “Italia” grapes (Vitis vinifera L.), and the effect of heating on the antioxidant capacity

On the design of complex energy systems: Accounting for renewables variability in systems sizing

CAD/CAM machining Vs pre-sintering in-lab fabrication techniques of Y-TZP ceramic specimens: Effects on their mechanical fatigue behavior

A multi-objective framework for cost-unavailability optimisation of residential distributed energy system design

Shale gas flowback water desalination: Single vs multiple-effect evaporation with vapor recompression cycle and thermal integration

Desalination of shale gas produced water: A rigorous design approach for zero-liquid discharge evaporation systems

Optimal integrated energy systems design incorporating variable renewable energy sources

A fuzzy linear approach to recognising signal profiles

Toxicity of gold nanorods on zebrafish (Danio rerio) embryos

The effect of grinding on the mechanical behavior of Y-TZP ceramics: A systematic review and meta-analyses

Are posts necessary for the restoration of root filled teeth with limited tissue loss? A structured review of laboratory and clinical studies

Quantum chemical studies on the submolecular structure of the nucleic acids

A Hierarchical Pattern Matching Procedure for Signal Abstraction

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