Implications of strong intergalactic magnetic fields for ultrahigh-energy cosmic-ray astronomy

Alves Batista, Rafael,Shin, Min-Su,Devriendt, Julien,Semikoz, Dmitri,Sigl, Guenter American Physical Society 2017 Physical review. D Vol.96 No.2

<P>We study the propagation of ultrahigh-energy cosmic rays in the magnetized cosmic web. We focus on the particular case of highly magnetized voids (B similar to nG), using the upper bounds from the Planck satellite. The cosmic web was obtained from purely magnetohydrodynamical cosmological simulations of structure formation considering different power spectra for the seed magnetic field in order to account for theoretical uncertainties. We investigate the impact of these uncertainties on the propagation of cosmic rays, showing that they can affect the measured spectrum and composition by up to. similar or equal to 80% and. similar or equal to 5%, respectively. In our scenarios, even if magnetic fields in voids are strong, deflections of 50 EeV protons from sources closer than similar to 50 Mpc are less than 15 degrees in approximately 10-50% of the sky, depending on the distribution of sources and magnetic power spectrum. Therefore, UHECR astronomy might be possible in a significant portion of the sky depending on the primordial magnetic power spectrum, provided that protons constitute a sizeable fraction of the observed UHECR flux.</P>

SPIF-A: on the development of a new concept of incremental forming machine

Alves de Sousa, R.J.,Ferreira, J.A.F.,Sa de Farias, J.B.,Torrao, J.N.D.,Afonso, D.G.,Martins, M.A.B.E. Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.5

This paper presents the design and project of an innovative concept for a Single Point Incremental Forming (SPIF) Machine. Nowadays, equipment currently available for conducting SPIF result mostly from the adaptation of conventional CNC machine tools that results in a limited range of applications in terms of materials and geometries. There is also a limited market supply of equipment dedicated to Incremental Sheet Forming (ISF), that are costly considering low batches, making it unattractive for industry. Other factors impairing a quicker spread of SPIF are large forming times and poor geometrical accuracy of parts. The following sections will depict the development of a new equipment, designed to overcome some of the limitations of machines currently used, allowing the development of a sounding basis for further studies on the particular features of this process. The equipment here described possesses six-degrees-of freedom for the tool, for the sake of improved flexibility in terms of achievable tool-paths and an extra stiffness provided by a parallel kinematics scheme. A brief state of the art about the existing SPIF machines is provided to support the project's guidelines.

Methodologies for the Determination of Endogenous Phosphorus Losses in Growing Pigs

Alves, Debora Aline,da Rocha, Leonardo Tombesi,dos Santos Camargo, Claudiele Aparecida,Figueiredo, Andriele Medianeira,Ceron, Marcos Speroni,Lucca, Walter,Zanella, Irineo,de Oliveira, Vladimir Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.11

A study was conducted to compare the endogenous basal losses of phosphorus (EBLP) in pigs fed diets containing gelatin (GEL) or spray-dried porcine plasma (SDPP) as protein sources and to determine the standardized total tract digestibility (STTD) of phosphorus (P) in SDPP. The trial was carried out at the Federal University of Santa Maria, Brazil. Twelve castrated pigs with an initial body weight of 55 kg were individually allotted in metabolic crates during two 12-day periods, each with 7 days of adaptation and 5 days of total fecal collection. The beginning and the end of the collecting periods were determined according to the marker-to-marker approach, using ferric oxide as an indigestible marker. Pigs were submitted to four semi-purified diets, one being a P-free diet with 30% of GEL as the protein source and three were diets with 10%, 20%, and 30% inclusion of SDPP respectively. Data were subjected to analysis of variance and the model included the effects of period, animal and treatments; the results of the three diets with increased levels of SDPP were subjected to linear regression analysis. The intercept of the relation of between ingested P and absorbed P represented the EBLP, while the slope indicated the STTD of P in SDPP. The EBLP means obtained by P-free diet and regression method were compared with the Student t test. The EBLP were 128.95 mg/kg dry matter intake (DMI) and 153.63 mg/kg DMI (standard error = 77.0; p<0.06) using the P-free diet with GEL as the protein source and the regression method, obtained with diets containing increased levels of SDPP, respectively. The apparent digestibility of P was 87.9%, 94.2%, and 92.9% for the treatments containing 10%, 20%, and 30% inclusion of SDPP, respectively. The estimated STTD of P obtained with the linear regression was 97.4%. When the EBLP estimated by the P-free diet was used to corrected the apparent digestibility of P in diets containing SDPP, the STTD of P in SDPP was 96.9%, 98.8%, and 95.9% for 10%, 20%, and 30% SDPP, respectively. Therefore, it can be concluded that SDPP can replace GEL to estimate the endogenous losses of P. In addition, the STTD of P in SDPP estimated with the P-free diet was 97.2% and it was 97.4% by the regression method, utilizing SDPP.

Epigallocatechin-3-gallate prior to composite resin in abfraction lesions: a split-mouth randomized clinical trial

Alves Luísa Valente Gotardo Lara,Fracasso Lisiane Martins,Cortez Thiago Vinicius,Souza-Gabriel Aline Evangelista,Corona Silmara Aparecida Milori 대한치과보존학회 2023 Restorative Dentistry & Endodontics Vol.48 No.2

Objectives Natural extracts have been investigated as a biomimetic strategy to mechanically strengthen the collagen network and control the biodegradation of extracellular matrix. This study evaluated the effect of epigallocatechin-3-gallate (EGCG) on abfraction lesions prior to the composite resin. Materials and Methods The sample consisted of 30 patients (aged between 28 and 60 years) with abfraction lesions located in 2 homologous premolars. The teeth were randomly assigned according to dentin treatment: 0.02% EGCG solution or distilled water (control). After enamel acid etching, the solutions were applied immediately for 1 minute. The teeth were restored with Universal Adhesive (3M) and Filtek Z350 XT (3M). Analyzes were done by 2 independent examiners using modified USPHS (retention, secondary caries, marginal adaptation, and postoperative sensitivity) and photographic (color, marginal pigmentation, and anatomical form) criteria at baseline (7 days) and final (18 months). The data analysis used Friedman and Wilcoxon signed-rank tests (α = 0.05). Results At baseline, all restorations were evaluated as alpha for all criteria. After 18 months, restorations were evaluated as alpha for secondary caries, color, and marginal pigmentation. There was significant difference between baseline and 18 months (p = 0.009) for marginal adaptation and postoperative sensitivity (p = 0.029), but no significant difference were verified between treatments (p = 0.433). The EGCG group had a restoration retention rate of 93.3%, while the control group had 96.7%. Conclusions The application of EGCG solution on abfraction lesions did not significantly influence the survival of the restorations based on clinical and photographic criteria. Objectives Natural extracts have been investigated as a biomimetic strategy to mechanically strengthen the collagen network and control the biodegradation of extracellular matrix. This study evaluated the effect of epigallocatechin-3-gallate (EGCG) on abfraction lesions prior to the composite resin. Materials and Methods The sample consisted of 30 patients (aged between 28 and 60 years) with abfraction lesions located in 2 homologous premolars. The teeth were randomly assigned according to dentin treatment: 0.02% EGCG solution or distilled water (control). After enamel acid etching, the solutions were applied immediately for 1 minute. The teeth were restored with Universal Adhesive (3M) and Filtek Z350 XT (3M). Analyzes were done by 2 independent examiners using modified USPHS (retention, secondary caries, marginal adaptation, and postoperative sensitivity) and photographic (color, marginal pigmentation, and anatomical form) criteria at baseline (7 days) and final (18 months). The data analysis used Friedman and Wilcoxon signed-rank tests (α = 0.05). Results At baseline, all restorations were evaluated as alpha for all criteria. After 18 months, restorations were evaluated as alpha for secondary caries, color, and marginal pigmentation. There was significant difference between baseline and 18 months (p = 0.009) for marginal adaptation and postoperative sensitivity (p = 0.029), but no significant difference were verified between treatments (p = 0.433). The EGCG group had a restoration retention rate of 93.3%, while the control group had 96.7%. Conclusions The application of EGCG solution on abfraction lesions did not significantly influence the survival of the restorations based on clinical and photographic criteria.

Analysis of etching at a solid-solid interface

Alves, Washington S.,Rodrigues, Evandro A.,Fernandes, Henrique A.,Mello, Bernardo A.,Oliveira, Fernando A.,Costa, Ismael V. L. American Physical Society 2016 Physical review. E Vol.94 No.4

Prediction of the dynamic flow stress

Alves, Marcilio Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.20 No.5

This article explores a constitutive equation that is able to correlate stress, strain and strain rate. In order to show the advantages of the constitutive equation here proposed and how its material parameters are obtained, data extracted from the literature, for materials as different as polymers and metallic alloys, are used. Finite element simulation of the impact behaviour of a beam is presented to highlight the care one needs to exercise when using the more traditional Cowper-Symonds equation. The present constitutive equation has shown to be accurate for a wide range of strains, stresses and strain rates.

Quality of Life Following Surgery for Pseudomyxoma Peritonei

Suzanne Alves 한국간호과학회 2007 한국간호과학회 학술대회 Vol.2007 No.11

Quantitative assessment of image artifacts from root filling materials on CBCT scans made using several exposure parameters

Katharina Alves Rabelo,Yuri Wanderley Cavalcanti,Martina Gerlane de Oliveira Pinto,Saulo Leonardo Sousa Melo,Paulo Sérgio Flores Campos,Luciana Soares de Andrade Freitas Oliveira,Daniela Pita de Melo 대한영상치의학회 2017 Imaging Science in Dentistry Vol.47 No.3

Purpose: To quantify artifacts from different root filling materials in cone-beam computed tomography (CBCT) images acquired using different exposure parameters. Materials and Methods: Fifteen single-rooted teeth were scanned using 8 different exposure protocols with 3 different filling materials and once without filling material as a control group. Artifact quantification was performed by a trained observer who made measurements in the central axial slice of all acquired images in a fixed region of interest using ImageJ. Hyperdense artifacts, hypodense artifacts, and the remaining tooth area were identified, and the percentages of hyperdense and hypodense artifacts, remaining tooth area, and tooth area affected by the artifacts were calculated. Artifacts were analyzed qualitatively by 2 observers using the following scores: absence (0), moderate presence (1), and high presence (2) for hypodense halos, hypodense lines, and hyperdense lines. Two-way ANOVA and the post-hoc Tukey test were used for quantitative and qualitative artifact analysis. The Dunnet test was also used for qualitative analysis. The significance level was set at P<.05. Results: There were no significant interactions among the exposure parameters in the quantitative or qualitative analysis. Significant differences were observed among the studied filling materials in all quantitative analyses. In the qualitative analyses, all materials differed from the control group in terms of hypodense and hyperdense lines (P<.05). Fiberglass posts did not differ statistically from the control group in terms of hypodense halos (P>.05). Conclusion: Different exposure parameters did not affect the objective or subjective observations of artifacts in CBCT images; however, the filling materials used in endodontic restorations did affect both types of assessments.

Experimental Evaluation of the Load Carrying Capacity of SFRC Flat Slabs Varying the Rectangularity Index of Columns

Vinicius Alves,Leonardo Oliveira,Antonio Santos,Leandro Trautwein 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.2

This work aims to evaluate the punching shear carrying capacity of flat slabs of reinforced concrete added with different amounts of steel fibers and varying the rectangularity index of columns under symmetrical loading. The addition of steel fiber provide higher load-carrying capacity. However, the column rectangularity index tends to lower that load-carrying capacity for magnitudes beyond 1.5 for the tested slabs. Nine models were tested with dimensions of 1,800 × 1,800 mm and 130 mm height varying the amount of added fiber (0, 50 and 60 kg/m) and the index of rectangularity (1.0, 1.5 e 2.0). From the results, the load carrying capacity, the vertical displacement, and the crack patterns were obtained. In addition, the results were compared with other similar studies and analytical models for steel fiber. The addition of steel fibers showed to be effective in increasing the punching shear load carrying capacity, it leads to a higher number of cracks and higher vertical displacements. Regarding the rectangularity index, for those tested slabs which was below 1.5, the load carrying capacity of punching shear of the slabs increases. However, for slabs above 1.5, it was observed that the punching shear load carrying capacity decreases.

Malignant Posterior Reversible Encephalopathy Syndrome: A Case of Posterior Irreversible Encephalopathy Syndrome

William Alves Martins,Luiz Carlos Porcello Marrone 대한신경과학회 2016 Journal of Clinical Neurology Vol.12 No.2