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Search Results: 1 - 10 of 753804 matches for " C. M. S.;Santos "
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Influence of the Fluoride Atoms Doping on the FeSe Superconductor  [PDF]
A. D. Bortolozo, A. D. Gueiros, L. M. S. Alves, C. A. M. dos Santos
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.39090
Abstract: It is reported the influence of the interstitial atoms doping on the FeSe superconductor. Polycrystalline samples with FeSeFx and FeSeBx nominal compositions were prepared by solid state reaction. An enhancement of the superconducting transition temperature was observed in the temperature dependence of the electrical resistivity curve to the FeSeF0.015 sample. R(T) data display superconducting behavior close to 12 K. The Tc increased with F doping by up to 50%. In contrast, boron doping no change the superconducting properties of the FeSe compound. As the FeSeFx and FeSeBx system the fluoride doping introduce a negative chemical pressure in the FeSe superconductor. This fact suggests that fluoride doping have changed the electronic properties of the FeSe phase.
Statistical properties of exoplanets. I. The period distribution: constraints for the migration scenario
S. Udry,M. Mayor,N. C. Santos
Physics , 2003, DOI: 10.1051/0004-6361:20030843
Abstract: Interesting emerging observational properties of the period-mass distribution of extra-solar planets are discussed. New recent detections confirm the already emphasized lack of massive planets (m_2sini>=2M_Jup) on short-period orbits (P<=100 days). Furthermore, we point out i) a shortage of planets in the 10--100 day period range as well as ii) a lack of light planets (m_2sini<=0.75M_Jup) on orbits with periods larger than ~100 days. The latter feature is shown not to be due to small-number statistics with Monte-Carlo simulations. These observational period-related characteristics are discussed in the context of the migration process of exoplanets. They are found to be in agreement with recent simulations of planet interactions with viscous disks. The observed valley at a few tens of days in the period distribution is interpreted as a transition region between two categories of planets that suffered different migration scenarios. The lack of light planets on longer-period orbits and the corresponding intriguing sharp limit in mass is tentatively explained by the runaway migration process recently studied by Masset & Papaloizou (2003). The observed properties also have implications for the observation strategies of the on-going surveys and of future higher-precision searches.
Study of Corrosion Resistance of Laser Welded Au-Pd-Ag-In Alloy Using Electrochemical Techniques  [PDF]
Márcio L. Dos Santos, Heloísa A. Acciari, Carla S. Riccardi, Antonio C. Guastaldi
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.27098
Abstract: The aim of this work was to evaluate the corrosion resistance of AuPdAgIn alloy, submitted to laser beam welding, in 0.9% NaCl solution, using electrochemical techniques. Measures of the open circuit potential (OCP) versus time were applied to electrochemical experiments, as well as potentiodynamic direct scanning (PDS) and electrochemical impedance spectroscopy (EIS) on AuPdAgIn alloy, submitted to laser beam welding in 0.9% NaCl solution. Some differences observed in the microstructure can explain the results obtained for corrosion potential, Ecorr, and corrosion resistance, Rp. EIS spectra have been characterized by distorted capacitive components, presenting linear impedance at low frequencies, including a non-uniform diffusion. The area of the laser weld presented corrosion potential slightly superior when compared to the one of the base metal. The impedance results suggest the best resistant corrosion behavior for laser weld than base metal region. This welding process is a promising alternative to dental prostheses casting.
Two-Dimensional Simulation of the Navier-Stokes Equations for Laminar and Turbulent Flow around a Heated Square Cylinder with Forced Convection  [PDF]
R?mulo D. C. Santos, Sílvio M. A. Gama, Ramiro G. R. Camacho
Applied Mathematics (AM) , 2018, DOI: 10.4236/am.2018.93023
Few studies jointly investigate thermal and turbulent effects. In general, these subjects are treated separately. The purpose of this paper is to use the Immersed Boundary Method (IBM) coupled with the Virtual Physical Model (VPM) to investigate incompressible two-dimensional Newtonian flow around a heated square cylinder at constant temperature on its surface with forced convection and turbulence. The VPM model dynamically evaluates the force that the fluid exerts on the immersed surface and the thermal exchange between both in the Reynolds numbers (Re) window 40 ≤ Re ≤ 5×103 . For simulations of turbulence the Smagorinsky and Spalart-Allmaras models are used. The first model uses the Large Eddy Simulation (LES) methodology and is based on the local equilibrium hypothesis for small scales associated with the Boussinesq hypothesis, such that the energy injected into the spectrum of the turbulence balances the energy dissipated by convective effects. The second model uses the concept Unsteady Reynolds Averaged Navier-Stokes Equations (URANS), with only one transport equation for turbulent viscosity, being calibrated in pressure gradient layers. The goal of this work is to analyse the combination of the heat-transfer phenomena with the turbulence for the thermo-fluid-structure interaction in a square cylinder. For this, it was developed a C/C++ code that requires low computational costs in regards to memory and computer facilities. It is observed that, with the increase of the Reynolds number, an increase of the drag coefficient occurs, as well as reinforces the influence of the pressure distribution downstream of the cylinder, which is strongly influenced by the formation and detachment of vortices on the upper and lower sides of the square cylinder.
A computer-controlled multi-electrode switch
Fernando J. V. Santos,M. Soledade C. S. Santos
Journal of Analytical Methods in Chemistry , 1999, DOI: 10.1155/s1463924699000164
Local Cutaneous Effects Associated with Chlorhexidine-Impregnated Gel Dressing in Hematopoietic Stem Cell Transplantation Patients  [PDF]
Bruna Nogueira dos Santos, Maria Carolina de Oliveira, Fernanda T. M. M. Braga, Amanda Salles Margatho, Laís C. C. Esparrachiari, Renata C. de C. P. Silveira
Open Journal of Nursing (OJN) , 2018, DOI: 10.4236/ojn.2018.82010

Introduction: Hematopoietic stem cell transplantation (HSCT) often requires a central venous catheter (CVC) for quick and safe vascular access. Currently, new technologies are available to protect the catheter insertion site, such as chlorhexidine-impregnated gel dressings (CIGD). Objectives: To evaluate local cutaneous effects associated with CIGD in patients undergoing HSCT. Methods: In this cross-sectional, prospective study, we evaluated 25 HSCT patients who had a CVC inserted. Patients were visited daily to monitor the CIGD changing procedures and evaluate abnormalities of the underlying skin after dressing removal. Findings: Local erythema was the most frequently detected abnormality, although usually transient and considered secondary to the mechanical trauma of dressing removal. The most severe lesions, consisting of areas of skin loss, erythematous plaques and/or vesicles were classified as skin irritation and presented in 11 (44%) of the 25 patients. An association test showed that skin irritation was more frequent in patients who underwent allogeneic HSCT (p = 0.03). Skin irritation was most frequently observed in areas of contact with the non-woven polyester adhesive tape (n = 22; 88%), which made up the adhesive margins of the dressing. The CIGD was discontinued in 6 (54%) of the 11 patients who presented severe skin injuries. Conclusion: In this study, we detected that skin irritation was more frequent in patients who underwent allogeneic HSCT. The most common skin manifestation was skin loss.

Nutritional Screening in a University Hospital: Comparison between Oncologic and Non-Oncologic Patients  [PDF]
Selma F. C. Cunha, Lidiane S. Tanaka, Roberta G. Salom?o, Danielle M. Macedo, Thatiane D. Santos, Fernanda M. Peria
Food and Nutrition Sciences (FNS) , 2015, DOI: 10.4236/fns.2015.61009
Abstract: Background & Aims: We compared the screening nutritional data of patients with malignant and non-malignant disease, and classified their nutritional risk according to the primary tumor’s site. Methods: Subjective Global Assessment was applied to 3008 patients within 48 h of admission to a public university. Subjects were divided into Oncologic Group (n = 576) or Non-Oncologic Group (n = 2432) according to the presence of neoplasms or other diseases respectively. These data were compared by the t-student test and classic chi-square test, with statistical significance set at p < 0.05. Results: The Oncologic Group presented a higher prevalence of weight loss (60.3% vs. 49.3%), quantitative (40.7% vs. 28.5%) and qualitative (16.4% vs. 7.6%) alterations in the food intake pattern, gastrointestinal symptoms and muscle waste (23.2% vs. 13.2%) as compared to the Non-Oncologic Group. Also, there was a higher prevalence of nutritional disturbances in the Oncologic Group, with 49.5% of the subjects moderately (or suspected to be malnourished) and 12.7% severely mal-nourished. Severe malnourishment was mainly observed in patients with head and neck (25%), upper digestive tract (21.9%) and soft tissue and bones (17.9%) tumors. Conclusion: When compared to other hospitalized patients, patients with neoplastic disease were in higher nutritional risk.
Virulence Factors in Methicillin-Resistant Staphylococcus aureus Isolated from ICU Units in Brazil  [PDF]
Simone G. Souza, Guilherme B. Campos, Pollianna S. Oliveira, Daniel S. Sousa, Danilo C. C. Da Silva, Verena M. Santos, Aline T. Amorim, Angelita M. O. G. Santos, Jorge Timenetsky, Mariluze P. Cruz, Regiane Yatsuda, Lucas M. Marques
Advances in Microbiology (AiM) , 2014, DOI: 10.4236/aim.2014.44027

Species of Staphylococcus are common in hospital infection (HI). Methicillin resistant S. aureus (MRSA) has also become a serious problem in Brazilian HI. The aim of this study was to characterize the pathogenicity of methicillin-resistant S. aureus (MRSA) and methicillin-sensitive Staphylococcus aureus (MSSA) isolated in public hospitals. The clinical isolates were obtained from intensive care unit. The MRSA and MSSA strains were genotyped by PCR for detection genes related to virulence factors. Moreover, the strains were tested for biofilm formation and cytokine induction in macrophages. Three strains of MRSA (9.68%) expressed the Sea gene, one (3.23%) Seb, 17 (54.84%) Spa and seven (22.58%) had PVL. Two MSSA strains (2.98%) expressed the Sea gene, three (4.48%) Seb, 18 (26.87%) Spa and 11 (16.42%) showed positive results for the PVL gene. There was no expression of Sec and CflA between MRSA and MSSA strains. Among MRSA and MSSA isolates, none statistical differences were observed in biofilm production. The analysis of cytokine induction in the inflammatory response of J774 macrophages by MRSA and MSSA isolates did not show statistical difference. Understanding the mechanisms of pathogenesis of S. aureus could provide important clues for both preventing and treating infection caused by these organisms.

La colección de Entomología del Museo Nacional de Ciencias Naturales (CSIC)
Izquierdo, I.,Martín, C.,París, M.,Santos, C.
Graellsia , 1997,
Abstract: The present paper gives information on the volume and taxonomic and faunistic composition of the Entomology Collection of the Museo Nacional de Ciencias Naturales (MNCN) in Madrid, Spain. An abstract of the inventory, including number of specimens and genera, number of type specimens and taxa represented by them, revisors, consultants, etc. is displayed. Different aspects of the facilities for consulting the collection and contact ways are commented. Several catalogues and publications on the housed materials in the Entomology Collection are listed as an Appendix. En el presente trabajo se aporta información sobre el volumen y la composición taxonómica y faunística de la colección de Entomología del Museo Nacional de Ciencias Naturales (MNCN) de Madrid, Espa a. Se ofrece un extracto de su inventario, aportando el número de ejemplares y géneros, número de especímenes tipo y táxones representados por ellos, revisores, consultores, etc. También se comentan diversos aspectos de la utilización de la colección y las vías de acceso a la misma. En un Apéndice se listan algunos catálogos y publicaciones elaboradas sobre material depositado en la colección de Entomología.
Revista GEINTEC : Gest?o, Inova??o e Tecnologias , 2013,
Abstract: A Moringa Oleifera Lam é uma planta ornamental e medicinal e possui a característica de adaptar-se a climas áridos e solos pobres em nutrientes. é um vegetal da família Moringaceae, originária do norte da índia. Este trabalho teve como objetivo realizar a caracteriza o físicoquímica de partes constituintes da planta: folha, flor, semente e vagem utilizadas na forma in natura e seca. O experimento foi conduzido no Laboratório de Tecnologias Alternativas em S o Cristóv o - SE. Posteriormente, as amostras de folhas, flores, sementes e vagens utilizadas neste trabalho foram coletadas e separadas em dois lotes, sendo um lote com as amostras que seriam analisadas in natura e o outro com amostras secas em secador solar. Foram realizadas as seguintes análises: atividade de água, acidez titulável, umidade, cinzas, lipídeos, proteínas, carboidratos, vitamina C, carotenoides, fibra total e alimentícia. Os dados obtidos foram submetidos à análise de variancia (ANOVA) e teste de Tukey para compara o de médias ao nível de significancia de 5%. Foi possível observar que para as análises de acidez, cinzas, lipídeos, proteínas e carboidratos, os resultados encontrados foram maiores nas partes secas quando comparado ao in natura. Entretanto, os valores para atividade de água, umidade, vitamina C e pH foram superiores nas análises in natura quando comparadas às amostras secas. Para os resultados de carotenoides, obtiveram-se varia es em ambas as partes. Portanto, a Moringa apresenta-se como um vegetal de excelentes propriedades nutricionais e funcionais.
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