Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2020 ( 4 )

2019 ( 451 )

2018 ( 897 )

2017 ( 895 )

Custom range...

Search Results: 1 - 10 of 353705 matches for " Luís Guerreiro "
All listed articles are free for downloading (OA Articles)
Page 1 /353705
Display every page Item
Assessing Inconspicuous Smartphone Authentication for Blind People
Diogo Marques,Luís Carri?o,Tiago Guerreiro
Computer Science , 2015,
Abstract: As people store more personal data in their smartphones, the consequences of having it stolen or lost become an increasing concern. A typical counter-measure to avoid this risk is to set up a secret code that has to be entered to unlock the device after a period of inactivity. However, for blind users, PINs and passwords are inadequate, since entry 1) consumes a non-trivial amount of time, e.g. using screen readers, 2) is susceptible to observation, where nearby people can see or hear the secret code, and 3) might collide with social norms, e.g. disrupting personal interactions. Tap-based authentication methods have been presented and allow unlocking to be performed in a short time and support naturally occurring inconspicuous behavior (e.g. concealing the device inside a jacket) by being usable with a single hand. This paper presents a study with blind users (N = 16) where an authentication method based on tap phrases is evaluated. Results showed the method to be usable and to support the desired inconspicuity.
Recomenda es para a terapêutica da hepatite C Management for Hepatitis C
José Velosa,Luís Caldeira,Ana I. Lopes,Luís Guerreiro
Jornal Português de Gastrenterologia , 2012,
Increased Risk of Acute Myeloid Leukemia in Patients with CYP1A1 Polymorphisms  [PDF]
Luís Arthur Flores Pelloso, Ismael Dale Cotrim Guerreiro da Silva, Naiara C?rrea Nogueira de Souza, Mihoko Yamamoto, Maria de Lourdes L. Ferrari Chauffaille
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.45111

Acute Myeloid Leukemia (AML) is a group of genetically diverse hematopoietic malignancies arising from cell progenitors developing in the myeloid pathway or from primitive stem cells. Genetic susceptibility of AML may account for an increased risk of AML due to partial metabolism of or biocativation of carcinogens. Chemical compounds are metabolized by a two-tiered phase detoxifying system. Polymorphisms in these pathways may lead to DNA damage and development of AML. We determined the frequencies of carcinogen metabolism gene polymorphisms (CYP1A1, del{GSTM1} and del{GSTT1}) in a case control-study based on polymorphism analysis. Fifty-eight consecutively AML patients (median age 62 years) and 174 sex and age-matched control group were assessed by a PCR-RFLP assay. There were 51 de novo and 7 secondary AML. CYP1A1*2A and CYP1A1*2C polymorphisms were more frequent in CG than AML p < 0.001 and in contrast, CYP1A1*3 and CYP1A1*4 were more frequent in AML than CG p <

Influência da polaridade de pesticidas n?o-i?nicos sobre sua sor??o em um latossolo
Piasarolo, Lenin;Rigitano, Renê Luís de Oliveira;Guerreiro, Mário César;
Ciência e Agrotecnologia , 2008, DOI: 10.1590/S1413-70542008000600019
Abstract: the sorption of thirteen non-ionic pesticides, with varying n-octanol/water partition coefficients (kow), by soil material taken from the a horizon of an acriferric red latosol was investigated. sorption isotherms of the pesticides were determined by the shake flask method. the concentrations of the chemicals in aqueous solutions were measured by hplc with uv detector. sorption isotherms of all compounds fitted well the freundlich model, with sorption coefficient (kf) values ranging from 0,2 to 202 ml.nmol-1. log kf values were shown to be linearly correlated (r2 = 0,87) with the log kow values of the pesticides, revealing that hydrophobic partitioning onto organic matter was the dominant mechanism of their sorption by the studied soil. for most compounds, the observed kf values were higher than those predicted by the briggs (1981) equation, which relates the kf of the pesticide to its kow and to the content of organic matter in the soil. these results showed that this equation, which was obtained for soils from england, is not adequate do predict the kf values of pesticides for the soil studied in this work, and that qualitative aspects of soil organic matter may be an important factor to affect the sorption of non-ionic pesticides by soils.
DYNA , 2012,
Abstract: Un sistema de gestión de la seguridad y salud en el trabajo, necesita cumplir con unos requisitos generales y particulares, que permitan promover una serie de buenas prácticas para lograr los objetivos de la política aprobada por la organización. La evaluación y control de los riesgos no es tarea fácil y necesita de unos medios materiales y humanos importantes. En la implementación y operación del sistema de gestión, juegan un papel fundamental los recursos humanos dedicados en exclusiva a la seguridad y salud en el trabajo. Es necesario establecer el organigrama de estos recursos y definir las funciones y responsabilidades en cada una de las áreas que componen el Servicio de Seguridad y Salud de la Empresa, que los estándares conocidos no detallan. En este artículo, partiendo del conocimiento de las técnicas preventivas, hemos descrito la estructura de un servicio de prevención complejo, que podrá tomarse como modelo práctico.
Lixivia??o do inseticida thiamethoxam em macrolisímetros de duas classes de solo
Castro, Nélio Ricardo Amaral;Rigitano, Renê Luís de Oliveira;Lima, José Maria de;Guerreiro, Mário César;
Ciência e Agrotecnologia , 2008, DOI: 10.1590/S1413-70542008000600021
Abstract: the leaching of thiamethoxam in two brazilian soils, a typic acriferric red latosol (lvwf) and a typic dystrophic red-yellow argisol (pvad), was investigated in macrolysimeters (1.0 m diameter and depth of 0.45, 0.90 and 1.80 m) of undisturbed material of the soils, which were kept without vegetation and under field conditions. the insecticide was applied at the beginning of the rainy season, using the formulation actara 250 w?, which was diluted in 100 ml of water and applied on the lysimeters surface. the water percolated through the lysimeters was collected until the end of rainy season of the following year, with samples being taken for determination of thiamethoxam concentration, performed by hplc. the results showed a high mobility of thiamethoxam in both soils, with more intense leaching of the compound in the pvad than in the lvwf. the total amounts of thiamethoxam leached below 0.45 m were equivalent to 53.8 and 19.4% of the applied amount, respectively for the pvad and lvwf. thiamethoxam residues were also found in the water collected from the 0.90 and 1.80 m lysimeters of both soils. these results indicate a high potential of thiamethoxam leaching under practical conditions of its use in the studied soils, despite the lack of vegetation.
A fluorescence-based assay for octreotide in kinetic release from depot formulations
Guerreiro, Luiz Henrique;Girad-Dias, Wendell;Miranda, Kildare R. de;Lima, Luís Mauricio T. R.;
Química Nova , 2012, DOI: 10.1590/S0100-40422012000500029
Abstract: here we report the validation of a derivatization method that makes use of fluorescamine as a selective reactant for the quantitative analysis of peptide and protein drugs in the dissolution profile from depot formulations. typical current methods require separation of the nano/microparticles and time-consuming chromatographic runs. in this study we report a method which can be conducted without the need for complete physical separation of the particles or removal of the unreacted probe. this method was used here for the analysis of the release profile of octreotide in a depot formulation, with results in excellent agreement with reported chromatographic assays.
Períodos de interferência de trapoeraba (Commelina benghalensis Hort.) no crescimento inicial de eucalipto (Eucalyptus grandis W. Hill ex Maiden)
Costa, Augusto Guerreiro Fontoura;Alves, Pedro Luís da Costa Aguiar;Pavani, Maria do Carmo Morelli Damasceno;
Revista árvore , 2004, DOI: 10.1590/S0100-67622004000400001
Abstract: commelina benghalensis is becomming the predominant weed invading eucalypts plantations in the state of s?o paulo due to the continual use of herbicides and other control methods applied. considering this, the objective of this work was to evaluate the effect of presence and control periods of commelina benghalensis on eucalyptus grandis initial growth, grew in winter and summer. a single eucalypt seedling was planted in a cement box and submitted to increasing periods of presence and control of commelina benghalensis (0, 20, 40, 60 e 80 days in competition or not). commelina benghalensis plant density was 4 plants.m-2 (in winner and summer conditions). the experimental period lasted for 100 days, after planting (dap). the experimental design was arranged in a randomized block design (crb) with 10 treatments and four replicates. the results for plant height, stem diameter, dry weights and leaf area showed that the period previous to interference (ppi), total period of interference control (tpic) and critical period of interference control (cpic), were 20, 60, and 20 to 60 dap, respectively, in winner conditions. in summer conditions, tpic was shorter than ppi (10 e 40 dap, respectively), therefore it was not possible to determine cpic in these conditions.
Manifesta es articulares nas viroses exantemáticas
Oliveira Solange Artimos de,Camacho Luís A.B.,Bettini Lílian Rachel,Fernandes Daniele Guerreiro
Revista da Sociedade Brasileira de Medicina Tropical , 1999,
Abstract: A freqüência de manifesta es articulares foi avaliada em 251 pacientes com diagnóstico clínico e laboratorial (detec o de IgM por ensaio imunoenzimático) de virose exantemática. As artropatias (artralgia e/ou artrite) foram mais observadas nos casos de dengue (49%) e de rubéola (38,2%) do que naqueles com parvovirose humana (30%) e sarampo (28,1%). Com exce o do sarampo, as artropatias predominaram nos adultos (315 anos de idade), sendo tal diferen a estatisticamente significativa. A ocorrência maior de artropatias em adultos foi mais evidente nos pacientes com parvovirose (75%), rubéola (65%) e dengue (57,7%) do que naqueles com sarampo (31%). As queixas articulares também predominaram nos pacientes do sexo feminino para todas as viroses avaliadas. Os resultados encontrados demonstram o freqüente acometimento articular nas doen as estudadas, e indicam a necessidade de comprova o laboratorial para o diagnóstico diferencial entre elas.
Exceptional representations of simple algebraic groups in prime characteristic
Marinês Guerreiro
Mathematics , 2012,
Abstract: Let G be a simply connected simple algebraic group over an algebraically closed field K of characteristic p>0 with root system R, and let ${\mathfrak g}={\cal L}(G)$ be its restricted Lie algebra. Let V be a finite dimensional ${\mathfrak g}$-module over K. For any point $v\inV$, the {\it isotropy subalgebra} of $v$ in $\mathfrak g$ is ${\mathfrak g}_v=\{x\in{\mathfrak g}/x\cdot v=0\}$. A restricted ${\mathfrak g}$-module V is called exceptional if for each $v\in V$ the isotropy subalgebra ${\mathfrak g}_v$ contains a non-central element (that is, ${\mathfrak g}_v\not\subseteq {\mathfrak z(\mathfrak g)}$). This work is devoted to classifying irreducible exceptional $\mathfrak g$-modules. A necessary condition for a $\mathfrak g$-module to be exceptional is found and a complete classification of modules over groups of exceptional type is obtained. For modules over groups of classical type, the general problem is reduced to a short list of unclassified modules. The classification of exceptional modules is expected to have applications in modular invariant theory and in classifying modular simple Lie superalgebras.
Page 1 /353705
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.