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Search Results: 1 - 10 of 226152 matches for " Lucas C.;Sato "
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As bases neurobiológicas do transtorno obsessivo-compulsivo e da síndrome de Tourette
Mercadante, Marcos T.;Rosario-Campos, Maria C.;Quarantini, Lucas C.;Sato, Fabio P.;
Jornal de Pediatria , 2004, DOI: 10.1590/S0021-75572004000300006
Abstract: objective: to describe and discuss evidence-based articles on the neurobiology of obsessive-compulsive disorder and tourette syndrome. sources of data: a review of the most relevant papers on the phenomenology, neuroanatomy, neuroimaging, genetic and immunological aspects of these two disorders was performed. summary of the findings: ritualistic behaviors and repetitive thoughts have been extensively studied in the last years. the definitions of obsessive-compulsive disorder and tourette syndrome emphasize the existence of a continuum of symptoms, with high prevalence in the general population. neurobiological findings have implicated genetic and immunological factors in the etiology of these two disorders. conclusions: advances in neuroscience triggered genetic and immunological research studies, allowing new perspectives on the treatment of obsessive-compulsive disorder and tourette syndrome patients.
A Gendered Study of Student Ratings of Instruction  [PDF]
Lucas Huebner, Rhonda C. Magel
Open Journal of Statistics (OJS) , 2015, DOI: 10.4236/ojs.2015.56058
Abstract:

This research tests for differences in mean class averages between male and female faculty for questions on a student rating of instruction form at one university in the Midwest are considered to be in the category of “very high research activity” by the Carnegie Commission on Higher Education. Differences in variances of class averages are also examined for male and female faculty. Tests are conducted by first considering all classes across the entire university and then classes just within the College of Science and Mathematics. The proportion of classes taught by female instructors in which the average male student rating was higher than the average female student rating was compared to the proportion of classes taught by male instructors in which the average male student rating was higher than the average female student rating. Results are discussed.

The use of thermally expandable microcapsules for increasing the toughness and heal structural adhesives
Guillaume Pesquet,Lucas F. M. da Silva,Chiaki Sato
Frattura ed Integrità Strutturale , 2011,
Abstract: In this research, the effect of thermally expandable microcapsules (TEMs) on mode I fracture toughness of structural adhesives were investigated. The single-edge-notch bending (SENB) test was used. Firstly, a standard toughness test was performed on adhesives with microcapsules. Secondly, since TEMs start their expansion at approximately 60oC, the next specimens were fatigue tested expecting a local heating in the notch leading to the desired expansion before being statically loaded for fracture toughness determination. Thirdly, a manual local heating at 90oC was applied in the notch before the fracture static test. The experimental results were successfully cross-checked through a numerical analysis using the virtual crack closure technique (VCCT) based on linear elastic fracture mechanics (LEFM). The major conclusion is that fracture toughness of the modified adhesives increased as the mass fraction of the TEMs increased.
Multiculturalismo e o debate entre liberais e comunitaristas: em defesa da interculturalidade dos direitos humanos
Douglas César Lucas
Sequência : Estudos Juridicos e Politicos , 2009,
Abstract: O presente texto pretende tratar da universalidade dos direitos humanos no ambito da sociedade multicultural. Demonstra as diferentes posi es que assumem os liberais e os comunitarisas no enfrentamento dos problemas de igualdade e de diferen a que caracterizam as demandas de identidade e de perten a cultural. Refere que os direitos humanos s o patrim nio comum da humanidade, e que sua universalidade mediadora/moderada é indispensável para a constru o de um diálogo intercultural e para a elabora o de propostas de emancipa o social que evitem tendências universalistas que homogeneízam e que combatam a desigualdade opressora travestida de direito a diferen a.
Rigidity of area-minimizing free boundary surfaces in mean convex three-manifolds
Lucas C. Ambrozio
Mathematics , 2013,
Abstract: We prove a local splitting theorem for three-manifolds with mean convex boundary and scalar curvature bounded from below that contain certain locally area-minimizing free boundary surfaces. Our methods are based on those of Micallef and Moraru. We use this local result to establish a global rigidity theorem for area-minimizing free boundary disks. In the negative scalar curvature case, this global result implies a rigidity theorem for solutions of the Plateau problem with length-minimizing boundary.
On perturbations of the Schwarzschild anti-de Sitter spaces of positive mass
Lucas C. Ambrozio
Mathematics , 2014, DOI: 10.1007/s00220-015-2360-6
Abstract: In this paper we prove the Penrose inequality for metrics that are small perturbations of the Schwarzschild anti-de Sitter metrics of positive mass. We use the existence of a global foliation by weakly stable constant mean curvature spheres and the monotonicity of the Hawking mass.
Electron Spin Resonance in Quasi-One-Dimensional Quantum Antiferromagnets: Relevance of Weak Interchain Interactions
Shunsuke C. Furuya,Masahiro Sato
Physics , 2013, DOI: 10.7566/JPSJ.84.033704
Abstract: We discuss universal features on the electron spin resonance (ESR) of a temperature-induced Tomonaga-Luttinger liquid phase in a wide class of weakly coupled $S=1/2$ antiferromagnetic spin chains such as spin ladders, spin tubes and three-dimensionally coupled spin chains. We show that the ESR linewidth of various coupled chains increases with lowering temperature while the linewidth of a single spin chain is typically proportional to temperature. This broadening with lowering temperature is attributed to anisotropic interchain interactions and has been indeed observed in several kinds of three-dimensional (3D) magnets of weakly coupled spin chains above the 3D ordering temperature. We demonstrate that our theory can account for anomalous behaviors of the linewidths in an $S=1/2$ four-leg spin tube compound Cu$_2$Cl$_4 \cdot $H$_8$C$_4$SO$_2$ (abbreviated to Sul-Cu$_2$Cl$_4$) and a three-dimensionally coupled $S=1/2$ spin chain compound CuCl$_2\cdot 2$NC$_5$H$_5$.
Mitigating the Curse of Dimensionality: Sparse Grid Characteristics Method for Optimal Feedback Control and HJB Equations
Wei Kang,Lucas C. Wilcox
Mathematics , 2015,
Abstract: We address finding the semi-global solutions to optimal feedback control and the Hamilton--Jacobi--Bellman (HJB) equation. Using the solution of an HJB equation, a feedback optimal control law can be implemented in real-time with minimum computational load. However, except for systems with two or three state variables, using traditional techniques for numerically finding a semi-global solution to an HJB equation for general nonlinear systems is infeasible due to the curse of dimensionality. Here we present a new computational method for finding feedback optimal control and solving HJB equations which is able to mitigate the curse of dimensionality. We do not discretize the HJB equation directly, instead we introduce a sparse grid in the state space and use the Pontryagin's maximum principle to derive a set of necessary conditions in the form of a boundary value problem, also known as the characteristic equations, for each grid point. Using this approach, the method is spatially causality free, which enjoys the advantage of perfect parallelism on a sparse grid. Compared with dense grids, a sparse grid has a significantly reduced size which is feasible for systems with relatively high dimensions, such as the $6$-D system shown in the examples. Once the solution obtained at each grid point, high-order accurate polynomial interpolation is used to approximate the feedback control at arbitrary points. We prove an upper bound for the approximation error and approximate it numerically. This sparse grid characteristics method is demonstrated with two examples of rigid body attitude control using momentum wheels.
Isotopic constrains on the Proterozoic geological history of the Amazonian Craton
C. C. G. Tassinari,K. Sato
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02891597
Abstract:
Development and evaluation of TDR probe for water rational management on substrates used in forest seedlings production
Marcelo Leite Conde Elaiuy,Lucas Massayuki Sato,Antonio Claudio Tesla Varallo,Claudinei Fonseca Souza
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2009,
Abstract: Time Domain Reflectometry (TDR) is a reliable technique to estimate in situ moisture content in different types of materials using probes. The forest seedlings production implies in a comprehensive and empirical process of water management applied to the substrate used for cultivation in dibble-tube. This type of cultivation requires analysis of the physical characteristics of water and nutrients retention of the substrate. The main goal of this research was to develop and evaluate a TDR coaxial probe for rational management of water in the forest seedlings production. Initially, a physical validation of the probe was performed considering the following parameters: reflection coefficient, characteristic impedance and spatial sensitivity. Also, the performance of the probe was evaluated to estimate water content in laboratory conditions and we obtained a calibration curve for each type of porous material used. The results demonstrated the viability of TDR probes to estimate water content in soil and substrates.
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