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Martins-Filho Paulo Ricardo,de Souza Araújo Adriano Antunes,Quintans-Júnior Lucindo José,Soares Bárbara dos Santos,Barboza Waneska de Souza,Cavalcante Taise Ferreira,Santos Victor Santana 한국역학회 2022 Epidemiology and Health Vol.44 No.-
This study investigated the dynamics of hospitalizations and in-hospital deaths from coronavirus disease 2019 (COVID-19) throughout the pandemic in northeast Brazil, the Brazilian region with the worst socioeconomic indicators. In total, 141,445 cases, 8,213 hospital admissions, and 1,644 in-hospital deaths from COVID-19 were registered from March 14, 2020 to February 5, 2022. The overall rates of hospitalization and in-hospital deaths were 5.8% and 20.0%, respectively. The hospitalization and death rates significantly decreased over time, which may have been related to progress in vaccination. During the spread of the Gamma variant (January to June 2021), most hospitalized individuals were young adults, and approximately 40% of deaths occurred in this age group. During the predominance of Delta (July to December 2021), over 75% of deaths occurred among the elderly and unvaccinated or partially vaccinated individuals. This rate decreased to 42.3% during the transmission of the Omicron variant (January to February 2022), during which 34.6% of deaths were recorded among fully vaccinated individuals (2 doses) and 23.1% among those who received full vaccination and a booster. The Omicron-driven third wave was associated with a rise in the proportion of deaths among vaccinated individuals, especially among those who had not received a booster dose.
Design and evaluation of a head-mounted display for immersive 3D teleoperation of field robots
Martins, Henrique,Oakley, Ian,Ventura, Rodrigo Cambridge University Press 2015 Robotica Vol.33 No.10
<B>SUMMARY</B><P>This paper describes and evaluates the use of a head-mounted display (HMD) for the teleoperation of a field robot. The HMD presents a pair of video streams to the operator (one to each eye) originating from a pair of stereo cameras located on the front of the robot, thus providing him/her with a sense of depth (stereopsis). A tracker on the HMD captures 3-DOF head orientation data which is then used for adjusting the camera orientation by moving the robot and/or the camera position accordingly, and rotating the displayed images to compensate for the operator's head rotation. This approach was implemented in a search and rescue robot (RAPOSA), and it was empirically validated in a series of short user studies. This evaluation involved four experiments covering two-dimensional perception, depth perception, scene perception, and performing a search and rescue task in a controlled scenario. The stereoscopic display and head tracking are shown to afford a number of performance benefits. However, one experiment also revealed that controlling robot orientation with yaw input from the head tracker negatively influenced task completion time. A possible explanation is a mismatch between the abilities of the robot and the human operator. This aside, the studies indicated that the use of an HMD to create a stereoscopic visualization of the camera feeds from a mobile robot enhanced the perception of cues in a static three-dimensional environment and also that such benefits transferred to simulated field scenarios in the form of enhanced task completion times.</P>
Characterization of Aspartate Aminotransferase Isoenzymes from Leaves of Lupinus albus L. cv Estoril
Martins, Maria Luisa Louro,Mourato, Miguel Pedro de Freitas Barbosa,Mendonca, Amarilis Paula alberti de varennes e 생화학분자생물학회 1989 BMB Reports Vol.35 No.2
Two aspartate azninotransferase (EC 2.6.1.1) isoenzymes (AAT-1 and AAT-2) from Lupines albus L. cv Estoril were separated, purified, and characterized. The molecular weight, pI value, optimum pH, optimum temperature, and thermodynamic parameters for thermal inactivation of both isaenzymes were abtained. Studies of the kinetic mechanism, and the kinetics of product inhibition and high substrate concentration inhibition, were performed. The effect of some divalent ions and irreversible inhibitors on both AAT isoenzymes was also studied. Native PAGE showed a higher molecular weight for AAT 2 compared with AAT 1. AAT 1 appears to be more anionic than AAT 2, which was suggested by the anion exchange chromatography SDS-PAGE showed a similar sub-unit molecular weight for both isoenzymes. The optimum pH (between 8.0 and 9.0) and temperature (60-65℃) were similar far both isoenzymes. In the temperature range of 45-65℃, AAT-2 has higher thermostability than AAT-1. Both isoenzymes showed a high affinity for keto-acid substrates, as well as a higher affinity to aspartate than glutamate. Manganese ions induced an increase in both AAT isoenzymes activities, but no cooperative effect was detected. Among the inhibitors tested, hydroxylamine affected both isoenzymes activity by an irreversible inhibition mechanism.
Validation of 2D shock capturing flood models around a surcharging manhole
Martins, R.,Kesserwani, G.,Rubinato, M.,Lee, S.,Leandro, J.,Djordjević,, S.,Shucksmith, J. D. Informa UK (TaylorFrancis) 2017 Urban water journal Vol.14 No.9
<P>This work offers a detailed validation of finite volume (FV) flood models in the case where horizontal floodplain flow is affected by sewer surcharge flow via a manhole. The FV numerical solution of the 2D shallow water equations is considered based on two approximate Riemann solvers, HLLC and Roe, on both quadrilateral structured and triangular unstructured mesh-types. The models are validated against a high resolution experimental data-set obtained using a physical model of a sewer system linked to a floodplain via a manhole. It was verified that the sensitivity of the models is inversely proportional to the surcharged flow/surface inflow ratio, and therefore requires more calibration from the user especially when concerned with localised modelling of sewer-to-floodplain flow. Our findings provide novel evidence that shock capturing FV-based flood models are applicable to simulate localised sewer-to-floodplain flow interaction.</P>
Martins Luciano Augusto Cano,Brasil Danieli Moura,Freitas Deborah Queiroz,Oliveira Matheus L 대한영상치의학회 2023 Imaging Science in Dentistry Vol.53 No.1
Purpose: The aim of this study was to objectively detect simulated tooth ankylosis using a novel method involving cone-beam computed tomography (CBCT). Materials and Methods: Tooth ankylosis was simulated in single-rooted human permanent teeth, and CBCT scans were acquired at different current levels (5, 6.3, and 8 mA) and voxel sizes (0.08, 0.125, and 0.2). In axial reconstructions, a line of interest was perpendicularly placed over the periodontal ligament space of 21 ankylosed and 21 non-ankylosed regions, and the CBCT grey values of all voxels along the line of interest were plotted against their corresponding X-coordinates through a line graph to generate a profile. The image contrast was increased by 30% and 60% and the profile assessment was repeated. The internal area of the resulting parabolas was obtained from all images and compared between ankylosed and non-ankylosed regions under different contrast enhancement conditions, voxel sizes, and mA levels using multi-way analysis of variance with the Tukey post hoc test (α = 0.05). Results: The internal area of the parabolas of all non-ankylosed regions was significantly higher than that of the ankylosed regions (P<0.05). Contrast enhancement led to a significantly greater internal area of the parabolas of non- ankylosed regions (P<0.05). Overall, voxel size and mA did not significantly influence the internal area of the parabolas (P>0.05). Conclusion: The proposed novel method revealed a relevant degree of applicability in the detection of simulated tooth ankylosis; increased image contrast led to greater detectability.
Self-sustained n-Type Memory Transistor Devices Based on Natural Cellulose Paper Fibers
Martins, Rodrigo,Pereira, Luis,Barquinha, Pedro,Correia, Nuno,Goncalves, Goncalo,Ferreira, Isabel,Dias, Carlos,Correia, N.,Dionisio, M.,Silva, M.,Fortunato, Elvira The Korean Infomation Display Society 2009 Journal of information display Vol.10 No.4
Reported herein is the architecture for a nonvolatile n-type memory paper field-effect transistor. The device was built via the hybrid integration of natural cellulose fibers (pine and eucalyptus fibers embedded in resin with ionic additives), which act simultaneously as substrate and gate dielectric, using passive and active semiconductors, respectively, as well as amorphous indium zinc and gallium indium zinc oxides for the gate electrode and channel layer, respectively. This was complemented by the use of continuous patterned metal layers as source/drain electrodes.
Prediction of the mechanical properties of granites under tension using DM techniques
Martins, Francisco F.,Vasconcelos, Graca,Miranda, Tiago Techno-Press 2018 Geomechanics & engineering Vol.15 No.1
The estimation of the strength and other mechanical parameters characterizing the tensile behavior of granites can play an important role in civil engineering tasks such as design, construction, rehabilitation and repair of existing structures. The purpose of this paper is to apply data mining techniques, such as multiple regression (MR), artificial neural networks (ANN) and support vector machines (SVM) to estimate the mechanical properties of granites. In a first phase, the mechanical parameters defining the complete tensile behavior are estimated based on the tensile strength. In a second phase, the estimation of the mechanical properties is carried out from different combination of the physical properties (ultrasonic pulse velocity, porosity and density). It was observed that the estimation of the mechanical properties can be optimized by combining different physical properties. Besides, it was seen that artificial neural networks and support vector machines performed better than multiple regression model.
Wound dressing using graphene quantum dots: a proof of concept
Martins Vanessa Gonzalez Ferreira Caminha,Alencar Luciana Magalhaes Rebelo,Souza Pedro Filho Noronha,Lorentino Carolinne Margot Albanez,Frota Heloisa Freire,dos Santos Andre Luis Souza,Gemini-Piperni 한국약제학회 2023 Journal of Pharmaceutical Investigation Vol.53 No.2
Purpose The costs and complexity related to effective wound healing treatment are immense. The number of multifactorial aspects related to the treatment of wounds (inflammation, infection, and many others) implies a complex multi-therapeutic approach involving various procedures, including medication and surgery. Regarding medication, there are only a few options, especially to treat chronic wounds. Recently graphene quantum dots have been applied for their potent antimicrobial properties as well as their significant tissue remodeling properties. In this study, we developed a formulation based on graphene quantum dots in the form of as a dry powder for wound healing. Methods Graphene quantum dots were produced by top-down technique using graphite as matrix, and fully characterized by Raman spectroscopy, atomic force microscopy, and X-ray diffractometry. The dry powder formulation was produced under aseptic conditions and evaluated in vitro and in vivo. Results The results showed that the formulation improved the healing process in both: in vitro and in vivo, with good adherence, healing time and tissue reconstruction. Finally, the results demonstrated that dry powder was very effective against P. aeruginosa, S. epidermidis, C. albicans and C. tropicalis, representing an improvementfor wound healing purposes. Conclusion The data corroborated the use of the dry powder formulation using graphene quantum dots as matrix as wound dressing, expanding the use of graphene quantum in the biomedical field.