Drawing-up a nation-wide inventory of intangible heritage in Portugal

Paulo Ferreira da Costa 국립민속박물관 2009 International Journal of Intangible Heritage Vol.4 No.-

The Institute for Museums and Conservation is the body ofthe Ministry of Culture which is responsible for promotingthe study, documentation, recording and safeguarding ofPortuguese intangible heritage by developing standards,guidelines and information systems for inventorying andproviding public access to IH. The drawing up of theNational Inventory of Intangible Heritage is a task to whichthe Institute of Museums and Conservation is presentlycommitted according to both its mission statement and tothe legal framework soon to be implemented underPortuguese Heritage Law. The text discusses the mainlegislative, institutional and scientific issues that must betaken into consideration in order to implement thisinventory and that must be considered as opportunitiesand/or strengths in the implementation of the NationalInventory of IH and, simultaneously, as key factors for thesuccess of the Portuguese administration’s strategy for thesafeguarding of IH.

Cone-beam computed tomography texture analysis can help differentiate odontogenic and non-odontogenic maxillary sinusitis

Costa Andre Luiz Ferreira,Fardim Karolina Aparecida Castilho,Ribeiro Isabela Teixeira,Jardini Maria Aparecida Neves,Braz-Silva Paulo Henrique,Orhan Kaan,de Castro Lopes Sérgio Lúcio Pereira 대한영상치의학회 2023 Imaging Science in Dentistry Vol.53 No.1

Purpose: This study aimed to assess texture analysis (TA) of cone-beam computed tomography (CBCT) images as a quantitative tool for the differential diagnosis of odontogenic and non-odontogenic maxillary sinusitis (OS and NOS, respectively). Materials and Methods: CBCT images of 40 patients diagnosed with OS (N = 20) and NOS (N = 20) were evaluated. The gray level co-occurrence (GLCM) matrix parameters, and gray level run length matrix texture (GLRLM) parameters were extracted using manually placed regions of interest on lesion images. Seven texture parameters were calculated using GLCM and 4 parameters using GLRLM. The Mann-Whitney test was used for comparisons between the groups, and the Levene test was performed to confirm the homogeneity of variance (α = 5%). Results: The results showed statistically significant differences (P<0.05) between the OS and NOS patients regarding 3 TA parameters. NOS patients presented higher values for contrast, while OS patients presented higher values for correlation and inverse difference moment. Greater textural homogeneity was observed in the OS patients than in the NOS patients, with statistically significant differences in standard deviations between the groups for correlation, sum of squares, sum of entropy, and entropy. Conclusion: TA enabled quantitative differentiation between OS and NOS on CBCT images by using the parameters of contrast, correlation, and inverse difference moment.

Influence of thickness and incisal extension of indirect veneers on the biomechanical behavior of maxillary canine teeth

Costa, Victoria Luswarghi Souza,Tribst, Joao Paulo Mendes,Uemura, Eduardo Shigueyuki,de Morais, Dayana Campanelli,Borges, Alexandre Luiz Souto The Korean Academy of Conservative Dentistry 2018 Restorative Dentistry & Endodontics Vol.43 No.4

Objectives: To analyze the influence of thickness and incisal extension of indirect veneers on the stress and strain generated in maxillary canine teeth. Materials and Methods: A 3-dimensional maxillary canine model was validated with an in vitro strain gauge and exported to computer-assisted engineering software. Materials were considered homogeneous, isotropic, and elastic. Each canine tooth was then subjected to a 0.3 and 0.8 mm reduction on the facial surface, in preparations with and without incisal covering, and restored with a lithium disilicate veneer. A 50 N load was applied at $45^{\circ}$ to the long axis of the tooth, on the incisal third of the palatal surface of the crown. Results: The results showed a mean of $218.16{\mu}strain$ of stress in the in vitro experiment, and $210.63{\mu}strain$ in finite element analysis (FEA). The stress concentration on prepared teeth was higher at the palatal root surface, with a mean value of 11.02 MPa and varying less than 3% between the preparation designs. The veneers concentrated higher stresses at the incisal third of the facial surface, with a mean of 3.88 MPa and a 40% increase in less-thick veneers. The incisal cover generated a new stress concentration area, with values over 48.18 MPa. Conclusions: The mathematical model for a maxillary canine tooth was validated using FEA. The thickness (0.3 or 0.8 mm) and the incisal covering showed no difference for the tooth structure. However, the incisal covering was harmful for the veneer, of which the greatest thickness was beneficial.

Magnetic resonance imaging appearance of foreign-body granulomatous reactions to dermal cosmetic fillers

Costa, Andre Luiz Ferreira,Caliento, Rubens,da Rocha, Glauber Bareia Liberato,Gomes, Joao Pedro Perez,Mansmith, Alison Jhisel Calle,de Freitas, Claudio Froes,Braz-Silva, Paulo Henrique Korean Academy of Oral and Maxillofacial Radiology 2017 Imaging Science in Dentistry Vol.47 No.4

Foreign body granulomas can develop after the injection of various cosmetic filling materials into the facial area to flatten wrinkles. Clinically, reactive lesions are easily mistaken for soft-tissue neoplasms or cysts. This report presents a case of foreign body granuloma in a 52-year-old female patient complaining of a painless swelling in the nasolabial region. Both clinical and histological features are described, underscoring the diagnostic role of magnetic resonance imaging findings.

Key factors affecting the shear behaviour of exterior RC beam-column joints

Ricardo Costa,Paulo Providência 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.85 No.3

An extended parametric study based on nonlinear finite element analyses is performed to assess the key factors affecting the shear behaviour of exterior beam-column joints of unbraced reinforced concrete frames. Extensive results are presented, the major conclusion being that the few shear behaviour models for exterior reinforced concrete beam-column joints available in the literature do not properly account for some of the most influential factors. The present results are also compared with recently published results for interior joints, showing that while some factors have a similar influence on interior and exterior joints others are relevant for only one of these types of joints. This also confirms, numerically, that some resisting mechanisms of exterior joints differ from those of interior joints.

Main factors determining the shear behavior of interior RC beam-column joints

Ricardo Costa,Paulo Providência 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.3

Reinforced concrete beam-column (RCBC) joints of laterally loaded unbraced frames are sometimes controlled by their shear behavior. This behavior relies on multiple and interdependent complex mechanisms. There are already several studies on the influence of some parameters on the shear strength of reinforced concrete joints. However, there are no studies methodically tackling all the most relevant parameters and quantifying their influence on the overall joint behavior, not just on its shear strength. Hence, considering the prohibitive cost of a comprehensive parametric experimental investigation, a nonlinear finite element analysis (NLFEA) was undertaken to identify the key factors affecting the shear behavior of such joints and quantify their influence. The paper presents and discusses the models employed in this NLFEA and the procedure used to deduce the joint behavior from the NLFEA results. Three alternative, or complementary, quantities related to shear are considered when comparing results, namely, the maximum shear stress supported by the joint, the secant shear stiffness at maximum shear stress and the secant shear stiffness in service conditions. Depending on which of these is considered, the lower or higher the relevance of each of the six parameters investigated: transverse reinforcement in the joint, intermediate longitudinal bars and diagonal bars in the column, concrete strength, column axial load and confining elements in transverse direction.

Handling Real-Time Communication in Infrastructured IEEE 802.11 Wireless Networks: The RT-WiFi Approach

Robson Costa,Jim Lau,Paulo Portugal,Francisco Vasques,Ricardo Moraes 한국통신학회 2019 Journal of communications and networks Vol.21 No.3

In this paper, the RT-WiFi architecture is proposedto handle real-time (RT) communication in infrastructured IEEE802.11 networks operating in high density industrial environments. This architecture is composed of a time division multiple access(TDMA)-based coordination layer that schedules the medium accessof RT traffic flows, and an underlying traffic separation mechanismthat is able do handle the coexistence of RT and non-RT trafficsources in the same communication environment. The simulationassessment considers an overlapping basic service set (OBSS),where a set of RT and non-RT stations share the same frequencyband. The performance assessment compares the behaviour of theRT-WiFi architecture vs. the behaviour of standard distributedcoordination function (DCF), point coordination function (PCF),enhanced distributed channel access (EDCA), and hybrid coordinationfunction (HCF) controlled channel access (HCCA) mediumaccess control mechanisms. A realistic error-prone model has beenused to measure the impact of message losses in the RT-WiFi architecture. It is shown that the proposed RT-WiFi architecture offersa significantly enhanced behaviour when compared with the useof IEEE 802.11 standard mechanisms, in what concerns averagedeadline misses and average access delays. Moreover, it also offersan almost constant access delay, which is a relevant characteristicwhen supporting RT applications.

Influence of joint modelling on the pushover analysis of a RC frame

Ricardo Costa,Paulo Providência,Miguel Ferreira 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.64 No.5

In general, conventional analysis and design of reinforced concrete (RC) frame structures overlook the role of beamcolumn (RCBC) joints. Nowadays, the rigid joint model is one of the most common for RCBC joints: the joint is assumed to be rigid (unable to deform) and stronger than the adjacent beams and columns (does not fail before them). This model is popular because (i) the application of the capacity design principles excludes the possibility of the joint failing before the adjacent beams and (ii) many believe that the actual behaviour of RCBC joints designed according to the seismic codes produced mainly after the 1980s can be assumed to be nominally rigid. This study investigates the relevance of the deformation of RCBC joints in a standard pushover analysis at several levels: frame, storey, element and cross-section. Accordingly, a RC frame designed according to preliminary versions of EN 1992-1-1 and EN 1998-1 was analysed, considering the nonlinear behaviour of beams and columns by means of a standard sectional fibre model. Two alternative models were used for the RCBC joints: the rigid model and an explicit component based nonlinear model. The effect of RCBC joints modelling was found to be twofold: (i) the flexibility of the joints substantially increases the frame lateral deformation for a given load (30 to 50%), and (ii) in terms of seismic performance, it was found that joint flexibility (ii-1) appears to have a minor effect on the force and displacement corresponding to the performance point (seismic demand assessed at frame level), but (ii-2) has a major influence on the seismic demand when assessed at storey, element and cross-section levels.

Three-field mixed beam-column finite element for geometric and material nonlinear analysis

Miguel Ferreira,Paulo Providência,Ricardo Costa,Pedro Gala,João Almeida 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.79 No.2

A mixed element (3fME) for geometric and material nonlinear finite element analysis of plane skeletal structures is presented, which can reach any predefined accuracy with only one element per structural member. This element is based on the 3-field approach−an application of the Hu-Washizu principle−directly approximating the fields of displacements, strains and stresses. The presented formulation considers both (i) geometrically nonlinear behavior−by including the second-order term in the strain-displacement relations and establishing equilibrium in the deformed configuration−and (ii) materially nonlinear elastoplastic behavior, at the fibre level, automatically handling the axial-bending interaction. The illustrative examples include both compression- and tension-bending interaction, and compare the accuracy of the novel finite element with published results.

Influence of thickness and incisal extension of indirect veneers on the biomechanical behavior of maxillary canine teeth

Victória Luswarghi Souza Costa,João Paulo Mendes Tribst,Eduardo Shigueyuki Uemura,Dayana Campanelli de Morais,Alexandre Luiz Souto Borges 대한치과보존학회 2018 Restorative Dentistry & Endodontics Vol.43 No.4

Objectives: To analyze the influence of thickness and incisal extension of indirect veneers on the stress and strain generated in maxillary canine teeth. Materials and Methods: A 3-dimensional maxillary canine model was validated with an in vitro strain gauge and exported to computer-assisted engineering software. Materials were considered homogeneous, isotropic, and elastic. Each canine tooth was then subjected to a 0.3 and 0.8 mm reduction on the facial surface, in preparations with and without incisal covering, and restored with a lithium disilicate veneer. A 50 N load was applied at 45° to the long axis of the tooth, on the incisal third of the palatal surface of the crown. Results: The results showed a mean of 218.16 µstrain of stress in the in vitro experiment, and 210.63 µstrain in finite element analysis (FEA). The stress concentration on prepared teeth was higher at the palatal root surface, with a mean value of 11.02 MPa and varying less than 3% between the preparation designs. The veneers concentrated higher stresses at the incisal third of the facial surface, with a mean of 3.88 MPa and a 40% increase in less-thick veneers. The incisal cover generated a new stress concentration area, with values over 48.18 MPa. Conclusions: The mathematical model for a maxillary canine tooth was validated using FEA. The thickness (0.3 or 0.8 mm) and the incisal covering showed no difference for the tooth structure. However, the incisal covering was harmful for the veneer, of which the greatest thickness was beneficial.