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Search Results: 1 - 10 of 331181 matches for " Carlos E. F.; "
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Microarthridion corbisierae sp. nov. (Harpacticoida, Tachidiidae), um novo copépode da meiofauna do litoral norte do estado de S?o Paulo, Brasil
Kihara, Terue C.;Rocha, Carlos E. F.;
Revista Brasileira de Zoologia , 2007, DOI: 10.1590/S0101-81752007000400007
Abstract: during studies on the diversity of meiobenthic marine harpacticoid copepods, a new representative of the family tachidiidae was found on the inner continental shelf of s?o paulo state, between s?o sebasti?o channel and ubatumirim bay, ubatuba (23o24's, 44o57,6'w). complementary material was collected near enseada beach, ubatuba (23o30's, 45o05'w). although the new species shares with m. laurenticum (nicholls, 1940) the reduced antennules, it can be easily distinguished from its congeners by leg 4 endopod with only two segments and the reduction of the number of inner setae of legs 1-4 endopod-3 and leg 3 exopod-3. tachidiids, typically inhabiting fine sediments of brackish and marine shallow waters in the northern hemisphere, are good indicators of heavy organic pollution. this is the first record of the family tachidiidae in the southern hemisphere.
Two Higgs Doublets from Fermion Condensation
Gustavo Burdman,Carlos E. F. Haluch
Physics , 2011, DOI: 10.1007/JHEP12(2011)038
Abstract: We consider the most generic situation in models where the electroweak symmetry is broken by the condensation of a strongly coupled fermion sector, such as for instance a fourth generation. We study the scalar content resulting from the condensation of both the up and the down type fermions, corresponding to a two-Higgs doublet model. We estimate the scalar spectrum using the Nambu--Jona-Lasinio model, improved by the renormalization group. We show that the scalar spectrum is generically lighter than for the case with only one right-handed fermion condensing and that due to a remnant Peccei-Quinn symmetry the lightest state is the pseudo-scalar, with masses ranging typically from 10 GeV to 120 GeV. We discuss the phenomenological consequences of this distinct spectrum.
Comparative Evaluation of Fractal Dimensions of CBCT Images Obtained with i-CAT Next Generation and PreXion 3D Elite Scanners  [PDF]
Carlos E. P. Toledo, Marcio J. S. Campos, Roberto S. M. F. de Oliveira, Robert W. F. Vitral
Journal of Biomedical Science and Engineering (JBiSE) , 2018, DOI: 10.4236/jbise.2018.1112029
Abstract: Comparing Cone-Beam Computed Tomography (CBCT) exams with different fields of view (FOV) are relevant to understand the impact of the inherent image quality on the reliability and accuracy of the diagnostic outcome. This study aimed to comparatively evaluate the results of the fractal analysis of images of the same structure taken in two cone beam computerized scanners with different FOVs. The initial selection of the images used, from two CBCT of the same individual jaw performed in two different scanners, was conducted in the Radiant program (RadiAnt DICOM Viewer) and exported to DICOM format. The selected images were processed in the ImageJ software (US National Institutes of Health), correcting the rotation of the images before conducting fractal analysis. In order to verify the normality of the data, the Shapiro-Wilk test was applied. The Mann-Whitney U, Levene and T tests were applied in order to compare the fractal analysis obtained by the two CBCT scanners. The intraclass correlation coefficient result was 0.988. The mean of the samples in the three comparisons (mentum samples, mental foramen samples and all included mentum and mental foramen samples) was higher for the PreXion 3D scanner. The p value of the tests was 0.000, for the three comparisons, at a 5% confidence level. The comparison of the fractal dimension averages of the images obtained with i-CAT and PreXion 3D scanners showed statistically significant differences, and higher averages were observed in the fractal analysis of images from PreXion 3D scanner. These results point to the need for a careful analysis of the parameters involved in the acquisition of images when results of fractal analysis resulting from different equipment are compared.
Análisis de las velocidades de las interfases durante la solidificación direccional horizontal de aleaciones Zn-10%Al
Gueijman,Sergio F; Schvezov,Carlos E; Ares,Alicia E.;
Revista de ciencia y tecnolog?-a , 2010,
Abstract: the prediction of the structures of solidification in binary alloys is important in order to advance in the knowledge of the field itself and in the field of materials in general. the validation and application of the numerical models that are being developed by our group intend to contribute to the expansion of the metallurgy knowledge, since there are few studies in the literature about the prevailing conditions in which the columnar to equiaxed transition (cet) is produced when the conditions of solidification are horizontal, one-directional and in two different ways of solidification, and when the fronts of solidification of two surfaces facing each other meet. the present study aimed to solidify horizontally the hypereutectic zn-10%al (za10) alloy, when heat is predominantly extracted from both extremes of the samples. this gives six interphases of solidification moving in opposite directions (three moving from the right and the three others moving from the left): two [liquid/(solid+liquid)] interphases, namely [l/ (s+l)] or il interphases, two [(solid+liquid)/(eutectic+solid+liquid)] interphases, namely [(s+l)/(e+l)] or ie, and two [(eutectic+solid+liquid)/solid] interphases, namely [(e+l)/s] interphases or is. the presence of these six interphases determined that the end of the solidification occured next to the geometric centre of the probes and seemed to be related to the presence of holes or cavities derived from the internal subsuperficial contraction. in this work, the speed and accelerations of all the interphases were determined as a function of time and position. the results obtained were compared with similar results obtained for hypoeutectic alloys solidified in similar conditions in a previous work.
Correlaciones entre parámetros térmicos, estructura y microdureza en aleaciones zinc-aluminio (ZA).
Alicia E. Ares,Sergio F. Gueijman,Carlos E. Schvezov
Scientia Et Technica , 2007,
Abstract: En el presente trabajo se investigan las correlaciones entre los parámetros térmicos (velocidad de enfriamiento, velocidad y posición de los frentes de solidificación, gradientes de temperatura), el tipo de estructura (tama o de grano, espaciamiento dendrítico) y la microdureza en muestras solidificadas direccionalmente de aleaciones Zn-Al (ZA). Se presentan correlaciones entre: la velocidad de enfriamiento y el ancho de los granos columnares, la velocidad de los frentes de solidificación versus la longitud de los granos columnares, la densidad de los granos equiaxiales y el gradiente de temperatura, el tama o de grano, el espaciamiento dendrítico primario y secundario y las variaciones en microdureza.
Cellular viability and nitric oxide (NO) production by J774 macrophages in the presence of orthodontic archwires  [PDF]
Carlos E. P. Toledo, Maria A. Souza, Marcelo R. Fraga, Luiz C. Ribeiro, Ana P. Ferreira, Robert W. F. Vitral
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.55032
Abstract: To assess, in vitro, the cellular viability in a murine macrophage cell line J774 with 9 different orthodontic wires and to evaluate the effects of its NO production. To assess cellular viability by MTT: 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl tetrazolium bromide assay in the cell line J774 with 9 different orthodontic wires and quantify NO production by these macrophages. Cell cultures were evaluated at 24, 48 and 72 hours. There was no significant difference of the means of cellular viability between the control and the group of wires in the respective time intervals. In the comparison with the control group, there was significant difference in the NO production in groups 1, 6, and 9 at 24 hours interval. Group 8 showed significant difference in relation to the control group at final time interval. Cellular viability in all groups was higher at the final time interval than at the initial time interval. This increase was significant in the control group. In the material groups, the final mean of cellular viability at 72 hours showed no significant difference when compared with the control group. NO production in all groups was higher at the final time interval than at the initial time interval. This increase was significant in the control group. In the material groups, the final mean of NO production at 72 hours was only significant in group 8 (betatitanium) when compared with the control group.
Effect of Pyrolysis Temperature and Feedstock Type on Agricultural Properties and Stability of Biochars  [PDF]
Rafaela Feola Conz, Thalita F. Abbruzzini, Cristiano A. de Andrade, Debora M. B. P. Milori, Carlos E. P. Cerri
Agricultural Sciences (AS) , 2017, DOI: 10.4236/as.2017.89067
Abstract: Pyrolysis temperature and feedstock type used to produce biochar influence the physicochemical properties of the obtained product, which in turn display a range of results when used as soil amendment. From soil carbon (C) sequestration strategy to nutrient source, biochar is used to enhance soil properties and to improve agricultural production. However, contrasting effects are observed from biochar application to soil results from a wide range of biochar’s properties in combination with specific environmental conditions. Therefore, elucidation on the effect of pyrolysis conditions and feedstock type on biochar properties may provide basic information to the understanding of soil and biochar interactions. In this study, biochar was produced from four different agricultural organic residues: Poultry litter, sugarcane straw, rice hull and sawdust pyrolysed at final temperatures of 350°C, 450°C, 550°C and 650°C. The effect of temperature and feedstock type on the variability of physicochemical properties of biochars was evaluated through measurements of pH, electrical conductivity, cation exchange capacity, macronutrient content, proximate and elemental analyses, Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analyses. Additionally, an incubation trial was carried under controlled conditions to determine the effect of biochar stability on CO2-eq emissions. Results showed that increasing pyrolysis temperature supported biochar stability regardless of feedstock, however, agricultural properties varied widely both as an effect of temperature and feedstock. Animal manure biochar showed higher potential as nutrient source rather than a C sequestration strategy. Improving the knowledge on the influence of pyrolysis temperature and feedstock type on the final properties of biochar will enable the use of better tailored materials that correspond to the expected results while considering its interactions with environmental conditions.
Risk Factors for Surgical Site Infection after Hip Arthroplasty: A Multicentric Study  [PDF]
Gabriel B. Tofani, Gustavo P. Irffi, Lucas F. Silva, Cynthia C. M. da Silva, Bráulio R. G. M. Couto, Gilberto D. Miranda, Carlos E. F. Starling
Surgical Science (SS) , 2016, DOI: 10.4236/ss.2016.72008
Abstract: The objective of this study is to answer three main questions: What is the risk of wound infection for patients undergoing hip arthroplasty? What are the main etiologicagents of surgical site infection (SSI)? What are the risk factors most associated with surgical site infection? Method: This was a multicentric, retrospective cohort study which analyzed data collected in five general hospitals in Belo Horizonte, Brazil, between the period of January 2009 and December 2013. The continuous parameters studied were age, length of hospital stay before surgery, duration of surgery, number of professionals at surgery and number of hospital admissions. Categorical variables were surgical wound classification (clean, clean contaminated, contaminated, dirty/infected), American Society of Anesthesiologists (ASA) score (I, II, III, IV, V), type of surgery (elective, emergency), general anesthesia (yes, no), prophylactic antibiotic (yes, no), trauma surgery (yes, no) and Nosocomial Infections Surveillance (NNIS) risk index (IRIC = 0, 1, 2, 3). Results: Estimated SSI risk was 3.2% (95% C.I. = 2.6% to 4.1%) and risk of osteomyelitis was 0.6% (95% C.I. = 0.4% to 1.1%). ASA score > 2, general anesthesia, length of hospital stay before surgery higher than four days, more than two professionals at surgical field and duration of surgery higher than five hours were risk factors for SSI after hip prosthesis (p < 0.05). The final multiple logistic regression analysis indicated that the modified NNIS risk was independently associated with surgical site infection after arthroplasty of hip. Conclusion: Despite the modified NNIS index being a risk factor for SSI, none of its independent variables was statistically significantly in the logistic model (p > 0.100). Each modified NNIS risk category increased the chance of a patient being infected by almost three times, when compared with the previous category (OR = 2.82; p = 0.011).
On the Selection and Meaning of Variable Order Operators for Dynamic Modeling
Lynnette E. S. Ramirez,Carlos F. M. Coimbra
International Journal of Differential Equations , 2010, DOI: 10.1155/2010/846107
Abstract: We review the application of differential operators of noninteger order to the modeling of dynamic systems. We compare all the definitions of Variable Order (VO) operators recently proposed in literature and select the VO operator that has the desirable property of continuous transition between integer and non-integer order derivatives. We use the selected VO operator to connect the meaning of functional order to the dynamic properties of a viscoelastic oscillator. We conclude that the order of differentiation of a single VO operator that represents the dynamics of a viscoelastic oscillator in stationary motion is a normalized phase shift. The normalization constant is found by taking the difference between the order of the inertial term (2) and the order of the spring term (0) and dividing this difference by the angular phase shift between acceleration and position in radians (), so that the normalization constant is simply 2/.
The Role of Costimulatory Receptors of the Tumour Necrosis Factor Receptor Family in Atherosclerosis
Ricardo F. Antunes,Juan Carlos Kaski,Ingrid E. Dumitriu
Journal of Biomedicine and Biotechnology , 2012, DOI: 10.1155/2012/464532
Abstract: Atherosclerosis is a chronic inflammatory disease that is mediated by both the innate and adaptive immune responses. T lymphocytes, that together with B cells are the cellular effectors of the adaptive immune system, are currently endowed with crucial roles in the development and progression of atherosclerosis. Costimulatory receptors are a class of molecules expressed by T lymphocytes that regulate the activation of T cells and the generation of effector T-cell responses. In this review we present the roles of costimulatory receptors of the tumour necrosis factor receptor (TNFR) superfamily in atherosclerosis and discuss the implications for future therapies that could be used to specifically modulate the immune response of pathogenic T cells in this disease.
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