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Perímetro e área : uma proposta didática para o ensino fundamental

Centenaro, Grasciele
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Trabalho de Conclusão de Curso Formato: application/pdf
POR
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Este trabalho tem como foco o ensino de perímetro e área de algumas figuras planas através do ladrilhamento, composição e decomposição de figuras em outras, tendo como objetivo principal investigar como os conceitos de perímetro e área de figuras planas podem ser apresentados aos alunos da 6ª série do Ensino Fundamental de maneira significativa e motivadora, de tal forma que estes conceitos não sejam apenas memorizados, mas sim compreendidos e incorporados aos seus conhecimentos. Por isso, esse trabalho foi norteado pelas seguintes questões: 1) O estudo de perímetro e área de figuras poligonais torna-­‐se mais fácil quando se faz uso de ladrilhamento, composição e decomposição de figuras?; 2) Uma sequência de atividades que trabalhe detalhadamente a diferença entre os conceitos de perímetro e área apresenta resultados significativos no aprendizado desses conceitos?; 3) A generalização e o uso de fórmulas são favorecidos pelo trabalho empírico realizado inicialmente como, por exemplo, para o cálculo da área do retângulo? Através da metodologia de Engenharia Didática, desenvolvemos uma sequência de atividades com uso de material concreto, sendo que todos os resultados foram obtidos de forma empírica. Na primeira etapa das atividades...

Efeitos da Seleção para Peso Pós-desmame sobre Medidas Corporais e Perímetro Escrotal de Machos Nelore de Sertãozinho (SP)

Cyrillo, Joslaine Noely Dos Santos Goncalves; Razook, Alexander George; De Figueiredo, Leopoldo Andrade; Neto, Luiz Martins Bonilha; Ruggieri, Ana Cláudia; Tonhati, Humberto
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 403-412
POR
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); The objective of this study was to evaluate the indirect effects of selection for post-weaning weight on body measures and scrotal perimeter of 809 Nellore males from selected herds (NeS and NeT) and control herd (NeC), of the Estação Experimental de Zootecnia de Sertãozinho. The statistical analyses were performed by using a sire mixed model where the random source of variation, sires, was nested within herds. The fixed effects were herds, year of performance test (PGP), age of cow and age of the animal as a covariate. The average genetic change for final weight, corrected for 378 days of age (W378), calculated as a deviation from the NeC herd, were 40.2 and 44.3 kg for the NeS and NeT herds, respectively. The correlated changes, for the other traits were, in the same order, 4.5 and 4.5 cm for hip height (HH); 6.2 and 7.0 cm for chest girth (CG); 5.8 and 6.3cm for body length (BL); 2.9 and 2.0 cm for dorsal line length (DL); 1.7 and 2.4 cm for rump length (RL); 1.0 and 1.3 cm for distance between pin bones (DPB); 1.8 and 2.6 cm for distance between hip bones (DHP); and 1.3 and 2.2 cm for scrotal perimeter (SP). The results of this study showed that the direct selection for postweaning weight promoted correlated positive responses in the body dimensions and also in the scrotal perimeter of Nellore males.

Spatial characterization of wildfire orientation patterns in California

Barros, Ana M.G.; Pereira, J.M.C.; Moritz, Max A.; Stephens, Scott L.
Fonte: Universidade Técnica de Lisboa Publicador: Universidade Técnica de Lisboa
Tipo: Artigo de Revista Científica
Publicado em //2013 ENG
Relevância na Pesquisa
27.13%
Using 100 years of fire perimeter maps, we investigate the existence of geographical patterns in fire orientation across California. We computed fire perimeter orientation, at the watershed level, using principal component analysis. Circular statistics were used to test for the existence of preferential fire perimeter orientations. Where perimeters displayed preferential orientation, we searched for evidence of orographic channeling by comparing mean fire orientation with watershed orientation. Results show that in California, 49% of the burnt area is associated with watersheds, where fires displayed preferential orientation. From these, 25% of the burnt area is aligned along the NE/SW orientation and 18% in the E/W orientation. In 27 out of 86 watersheds with preferential fire alignment, there is also correspondence between mean fire orientation and watershed orientation. Topographic influence on fire spread and dominant wind patterns during the fire season can account for the consistency in fire perimeter orientation in these regions. Our findings highlight the historical pattern of fire perimeter orientation and identify watersheds with potential orographic channeling

Comparison of the original Amsler grid with the preferential hyperacuity perimeter for detecting choroidal neovascularization in age-related macular degeneration

Isaac,David Leonardo Cruvinel; Ávila,Marcos Pereira de; Cialdini,Arnaldo Pacheco
Fonte: Conselho Brasileiro de Oftalmologia Publicador: Conselho Brasileiro de Oftalmologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2007 EN
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PURPOSE: To compare the preferential hyperacuity perimeter (Preview PHP; Carl Zeiss Meditec, Dublin, CA) with the original Amsler grid in the detection of choroidal neovascularization (CNV) in patients with age-related macular degeneration (AMD). METHODS: Patients were classified into groups, based on the severity of the age-related macular degeneration and underwent preferential hyperacuity perimeter and Amsler grid testing. High sensitivity and or high specificity of a method were defined as the observation of at least 80% of each one the parameters. RESULTS: Sixty-five patients (65 eyes) were analyzed statistically. The sensitivity of detection of choroidal neovascularization was 70% by the Amsler grid and 90% by the preferential hyperacuity perimeter and the specificity of the Amsler grid was 85.5% and that of the preferential hyperacuity perimeter 81.8%. CONCLUSIONS: The preferential hyperacuity perimeter has greater sensitivity than the Amsler grid in the detection of choroidal neovascularization among patients over 50 years of age and is a promising method for monitoring patients with age-related macular degeneration. Although the original Amsler grid is less sensitive, it is a portable method, not expensive, accessible and presents reasonable sensitivity and high specificity in the diagnosis of choroidal neovascularization. Its use can be recommended for self-monitoring in patients with age-related macular degeneration as an alternative to preferential hyperacuity perimeter and when this method is not available.

Correlation between transverse expansion and increase in the upper arch perimeter after rapid maxillary expansion

Claro,Cristiane Aparecida de Assis; Abrão,Jorge; Reis,Silvia Augusta Braga; Fantini,Solange Mongelli de
Fonte: Sociedade Brasileira de Pesquisa Odontológica - SBPqO Publicador: Sociedade Brasileira de Pesquisa Odontológica - SBPqO
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2006 EN
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The purpose of the present study was to assess the correlation between transverse expansion and the increase in upper arch perimeter, after maxillary expansion. Dental casts of eighteen patients were obtained before treatment and again five months after maxillary expansion. Measurements of intermolar width, intercanine width, arch length and arch perimeter were made with a digital caliper on photocopies taken from the dental casts. After assessment of the method error, a multiple regression model was developed following the identification of the best subset of variables. The resulting equation led to the conclusion that the increase in arch perimeter is approximately given by the addition of 0.54 times the intercanine expansion, and 0.87 times the arch length alteration.

Analysis of High-Perimeter Planar Electrodes for Efficient Neural Stimulation

Wei, Xuefeng F.; Grill, Warren M.
Fonte: Frontiers Research Foundation Publicador: Frontiers Research Foundation
Tipo: Artigo de Revista Científica
Publicado em 10/11/2009 EN
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Planar electrodes are used in epidural spinal cord stimulation and epidural cortical stimulation. Electrode geometry is one approach to increase the efficiency of neural stimulation and reduce the power required to produce the level of activation required for clinical efficacy. Our hypothesis was that electrode geometries that increased the variation of current density on the electrode surface would increase stimulation efficiency. High-perimeter planar disk electrodes were designed with sinuous (serpentine) variation in the perimeter. Prototypes were fabricated that had equal surface areas but perimeters equal to two, three or four times the perimeter of a circular disk electrode. The interface impedance of high-perimeter prototype electrodes measured in vitro did not differ significantly from that of the circular electrode over a wide range of frequencies. Finite element models indicated that the variation of current density was significantly higher on the surface of the high-perimeter electrodes. We quantified activation of 100 model axons randomly positioned around the electrodes. Input–output curves of the percentage of axons activated as a function of stimulation intensity indicated that the stimulation efficiency was dependent on the distance of the axons from the electrode. The high-perimeter planar electrodes were more efficient at activating axons a certain distance away from the electrode surface. These results demonstrate the feasibility of increasing stimulation efficiency through the design of novel electrode geometries.

Clock Drawing in Spatial Neglect: A Comprehensive Analysis of Clock Perimeter, Placement, and Accuracy

Chen, Peii; Goedert, Kelly M.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
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Clock drawings produced by right-brain-damaged (RBD) individuals with spatial neglect often contain an abundance of empty space on the left while numbers and hands are placed on the right. However, the clock perimeter is rarely compromised in neglect patients’ drawings. By analyzing clock drawings produced by 71 RBD and 40 healthy adults, this study investigated whether the geometric characteristics of the clock perimeter reveal novel insights to understanding spatial neglect. Neglect participants drew smaller clocks than either healthy or non-neglect RBD participants. While healthy participants’ clock perimeter was close to circular, RBD participants drew radially extended ellipses. The mechanisms for these phenomena were investigated by examining the relation between clock-drawing characteristics and performance on six subtests of the Behavioral Inattention Test (BIT). The findings indicated that the clock shape was independent of any BIT subtest or the drawing placement on the test sheet and that the clock size was significantly predicted by one BIT subtest: the poorer the figure and shape copying, the smaller the clock perimeter. Further analyses revealed that in all participants, clocks decreased in size as they were placed farther from the center of the paper. However...

The Indented Perimeter as the Growth Front of the Lamellar Single Micro-Crystal of Colloidal Gold

UYEDA, Natsu
Fonte: Oxford University Press Publicador: Oxford University Press
Tipo: Artigo de Revista Científica Formato: text/html
EN
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The single micro-crystal of gold grows on its (111) habit surface as a lamella of about 100 Å thick when prepared under the acidic condition, sometimes being accompanied even by the spiral growth steps. The aspect of the growing crystal was observed by the electron microscope at several intermediate stages. The most characteristic feature is the anomalously indented or densely fringed perimeter, which finally disappears leaving the sharp straight lines when the growth comes to an end. It seems very reasonable to consider that the small particles of colloidal gold of ordinary size or much less are adsorbed on the side surface of the perimeter and arrange themselves so as to be well fitted to the lattice of the main crystal. The indentation of the perimeter also appears when the crystal undergoes the spiral growth.

Age-corrected normal differential luminance values for the entire 80° visual field applying three threshold estimating strategies, using the Octopus 900 perimeter; Alterkorrigierte Normwerte für das gesamte 80° Gesichtsfeld mit drei verschiedenen Strategien und dem Octopus 900 Perimeter gemessen

Pricking, Sandra
Fonte: Universidade de Tubinga Publicador: Universidade de Tubinga
Tipo: Dissertação
EN
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37.13%
Purpose: 1. To create a model describing age-corrected normal values for the entire 80° visual field (VF) measured with the Octopus 900 (O900) perimeter, 2. to compare three threshold estimating strategies: conventional (4-2-1), dynamic and German Adaptive Threshold Estimation (GATE-i) and 3. to compare local differential luminal sensitivity (DLS) values obtained with the GATE-i strategy on both, the O900 and the Octopus 101 (O101) perimeters. Methods: 81 ophthalmologically healthy subjects between 10 and 79 years of age were examined with the O900 perimeter within 80° eccentricity (86 stimulus locations) using the three different strategies in a randomised order. 16 stimulus locations were measured twice during one examination in both conventional and dynamic strategies to assess the short-term fluctuation (SF). To measure the long-term fluctuation (LF), 14 subjects were examined on two further appointments. 24 subjects were examined with the GATE-i strategy on both the O900 and the O101 perimeters. Results: With the dynamic strategy local DLS values were 0.21 dB (mean) higher, with the GATE-i strategy 0.98 dB (mean) higher than with the conventional strategy. A smooth mathematical model for each strategy was achieved. Model fit was nearly identical for the conventional (R2 = 0.75)...

Oberflächenspannung in der Methode der Finiten Massen; Surface tension in the finite mass method

Langmann, Christian
Fonte: Universidade de Tubinga Publicador: Universidade de Tubinga
Tipo: Dissertação
DE_DE
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Die Methode der Finiten Massen ist eine Lagrangesche Teilchenmethode zur numerischen Simulation kompressibler Fluide. Im Kontext dieser Methode werden Effekte modelliert, welche an freien Rändern von Fluidvolumina (Flüssigkeiten) unter dem Einfluß von Oberflächenspannung auftreten. Dabei werden nur solche Effekte untersucht, die von charakteristischen geometrischen Größen der betrachteten Oberfläche abhängen. Die Oberfläche eines Fluidvolumens wird als Niveaufläche der Massendichte definiert, so daß im weiteren aus den Level-Set Methoden bekannte Techniken zum Einsatz kommen können. Diese erlauben es, mit Hilfe der Perimeter-Formel ein Energiefunktional für die Oberflächenenergie zu definieren, welches dann im Rahmen der Methode der Finiten Massen behandelt werden kann. Neben analytischen Betrachtungen der Eigenschaften der Modellierung wird insbesondere auch auf die für numerisch stabile Rechnungen benötigte signierte Distanzfunktion zu einer gegebenen Niveaufläche eingegangen. Diese wird als Viskositätslösung der Eikonalgleichung berechnet, wobei zur Lösung auf einem regelmäßigen Gitter auf die Fast Marching Method zurückgegriffen wird. Zur Illustration der grundsätzlichen Eigenschaften der Modellierung schließen sich kurze Beispielrechnungen an.; The Finite Mass Method is a Lagrangian particle method for numerical simulation of compressible flows. Within the context of this method effects appearing on free boundaries of fluids (liquids) arising from surface tension are modeled. Only such effects depending on characteristic geometric quantities of the considered surface are examined. The surface of a fluid is defined as a level set of the mass density. This admits using well known techniques from the area of level set methods. Thus taking the perimeter formula from geometric measure theory it is possible to define an energy functional for the energy of the surface...

Heat Semigroups and Diffusion of Characteristic Functions; Wärmeleitungshalbgruppen and Diffusion charakteristischer Funktionen

Preunkert, Marc
Fonte: Universidade de Tubinga Publicador: Universidade de Tubinga
Tipo: Dissertação
EN
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27.06%
In this work we study the classical heat equation in $R^n$ if the initial data is given by the characteristic function $1_D$ of a compact set $D$ in $R^n$. Physically this means that at the beginning of the evolution we have a uniform distribution of heat in $D$. The heat semigroup $(T(t))$ on $L^p(R^n)$ applied to the characteristic function $1_D$ then yields the resulting heat flow $T(t)1_D$ for all times $t>0$ with initial data $1_D$. Using the heat kernel of $R^n$ $T(t)1_D$ can be represented by an explicit integral formula. We are particularly interested in the evolution of the $L^2$-norm of $T(t)1_D$ which by the elementary relation between norm and inner product in the Hilbert space $L^2(R^n)$ is closely related to the amount of heat that is still inside $D$ after time $t>0$. First (Chapter 2) we focus on the short time behaviour of the heat flow. We start with a detailed treatment of the evolution of the level sets of $T(t)1_D$ and determine the pointwise asymptotic behaviour for this evolution: We show that for short times the evolution of the level sets admits an asymptotic expansion in powers of $t^{1/2}$. We determine the coefficients up to order $t^2$ in terms of geometric invariants of the boundary $partial D$ and give a general formula for the further coefficients of higher order. We then show that the short time behaviour of the $L^2$-norm of the flow $T(t)1_D$ is controlled by the perimeter of $D$. As a consequence we obtain a comparison result stating that for two arbitrary compact sets $A...

Curvas padrão pôndero-estatural de portadores de Síndrome de Down procedentes da região urbana da cidade de São Paulo; Growth charts (standard grown curves) of children with down Syndrome deriving from São Paulo\'s Urban area

Mustacchi, Zan
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 29/11/2002 PT
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De fato, por não existir um levantamento antropométrico de crianças com síndrome de Down no Brasil, foi realizado em São Paulo um estudo biométrico prospectivo que permitiu a elaboração de curvas antropométricas avaliando taxas de peso, estatura e perímetro cefálico elaboradas por tabelas e gráficos com valores lapidados de 4 percentis de dois grupos etários de ambos os sexos divididos de 0-24 meses e de 2-8 anos respectivamente.o estudo considerou e excluiu, quando pertinente, fatores ambientais ou genéticos paralelos que eventualmente pudessem interferir nas variáveis avaliadas. A ampla revisão bibliográfica e a comparação dos dados antropométricos permitiram enfatizar a importância de curvas padrões nacionais para estatura, peso e perímetro cefálico de crianças com síndrome de Down, facilitando o diagnóstico diferencial entre outros comprometimentos clínicos, auxiliando na intervenção clínico-Iaboratorial, na prevenção e acompanhamento médico.; Considerint that there is any anthropometrical evaluation in children with Down\'s syndrome in Brazil, the objective of this prospective biometric investigation was to construct anthropometrical curves for weight, stature and cephalic perimeter in children with Down\' s syndrome living in São Paulo urban area. Ali measurements were obtained from January 1980 to December 1999. Ali height or cephalic perimeter values 10% below or above and weight values 16% below or above of the 1st and 3rd quartile were excluded. Tables for each sex during 0-24 months and 2-8 years were presented in mean...

Ignition from a Fire Perimeter in a WRF Wildland Fire Model

Kondratenko, Volodymyr Y.; Beezley, Jonathan D.; Kochanski, Adam K.; Mandel, Jan
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 13/07/2011
Relevância na Pesquisa
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The current WRF-Fire model starts the fire from a given ignition point at a given time. We want to start the model from a given fire perimeter at a given time instead. However, the fuel balance and the state of the atmosphere depend on the history of the fire. The purpose of this work is to create an approximate artificial history of the fire based on the given fire perimeter and time and an approximate ignition point and time. Replaying the fire history then establishes a reasonable fuel balance and outputs heat fluxes into the atmospheric model, which allow the atmospheric circulation to develop. Then the coupled atmosphere-fire model takes over. In this preliminary investigation, the ignition times in the fire area are calculated based on the distance from the ignition point to the perimeter, assuming that the perimeter is convex or star-shaped. Simulation results for an ideal example show that the fire can continue in a natural way from the perimeter. Possible extensions include algorithms for more general perimeters and running the fire model backwards in time from the perimeter to create a more realistic history. The model used extends WRF-Fire and it is available from openwfm.org.; Comment: 12th Annual WRF Users' Workshop, Boulder...

Random sets of finite perimeter

Rataj, Jan
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 08/01/2014
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An approach to modelling random sets with locally finite perimeter as random elements in the corresponding subspace of $L^1$ functions is suggested. A Crofton formula for flat sections of the perimeter is shown. Finally, random processes of particles with finite perimeter are introduced and it is shown that their union sets are random sets with locally finite perimeter.

Asymptotic behaviour of convex and column-convex lattice polygons with fixed area and varying perimeter

Mitra, Mithun K; Menon, Gautam I; Rajesh, R
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 15/03/2010
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We study the inflated phase of two dimensional lattice polygons, both convex and column-convex, with fixed area A and variable perimeter, when a weight \mu^t \exp[- Jb] is associated to a polygon with perimeter t and b bends. The mean perimeter is calculated as a function of the fugacity \mu and the bending rigidity J. In the limit \mu -> 0, the mean perimeter has the asymptotic behaviour \avg{t}/4 \sqrt{A} \simeq 1 - K(J)/(\ln \mu)^2 + O (\mu/ \ln \mu) . The constant K(J) is found to be the same for both types of polygons, suggesting that self-avoiding polygons should also exhibit the same asymptotic behaviour.; Comment: 10 pages, 3 figures

Assimilation of Perimeter Data and Coupling with Fuel Moisture in a Wildland Fire - Atmosphere DDDAS

Mandel, Jan; Beezley, Jonathan D.; Kochanski, Adam K.; Kondratenko, Volodymyr Y.; Kim, Minjeong
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
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We present a methodology to change the state of the Weather Research Forecasting (WRF) model coupled with the fire spread code SFIRE, based on Rothermel's formula and the level set method, and with a fuel moisture model. The fire perimeter in the model changes in response to data while the model is running. However, the atmosphere state takes time to develop in response to the forcing by the heat flux from the fire. Therefore, an artificial fire history is created from an earlier fire perimeter to the new perimeter, and replayed with the proper heat fluxes to allow the atmosphere state to adjust. The method is an extension of an earlier method to start the coupled fire model from a developed fire perimeter rather than an ignition point. The level set method is also used to identify parameters of the simulation, such as the spread rate and the fuel moisture. The coupled model is available from openwfm.org, and it extends the WRF-Fire code in WRF release.; Comment: ICCS 2012, 10 pages; corrected some DOI typesetting in the references

Gauss-Green theorem for weakly differentiable vector fields, sets of finite perimeter, and balance laws

Chen, G. Q.; Torres, M.; Ziemer, W.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 24/09/2007
Relevância na Pesquisa
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We analyze a class of weakly differentiable vector fields (\FF \colon \rn \to \rn) with the property that (\FF\in L^{\infty}) and (\div \FF) is a Radon measure. The primary focus of our investigation is to introduce a suitable notion of the normal trace of any divergence-measure field $\FF$ over the boundary of an arbitrary set of finite perimeter, which ensures the validity of the Gauss-Green theorem. To achieve this, we establish a fundamental approximation theorem which states that, given a Radon measure $\mu$ that is absolutely continuous with respect to $\mathcal{H}^{N-1}$ on $\rn$, any set of finite perimeter can be approximated by a family of sets with smooth boundary essentially from the measure-theoretic interior of the set with respect to the measure $\|\mu\|$. With this approximation theorem, we derive the normal trace of $\FF$ on the boundary of any set of finite perimeter, (E), as the limit of the normal traces of $\FF$ on the boundaries of the approximate sets with smooth boundary, so that the Gauss-Green theorem for $\FF$ holds on (E). With these results, we analyze the Cauchy fluxes that are bounded by a Radon measure over any oriented surface (i.e. an $(N-1)$-dimensional surface that is a part of the boundary of a set of finite perimeter) and thereby develop a general mathematical formulation of the physical principle of balance law through the Cauchy flux. Finally...

Avaliação da mobilidade torácica em crianças saudáveis do sexo masculino pela medição do perímetro torácico; Assessment of healthy male children chest mobility by measuring the thoracic perimeter

Simon, Karen Muriel; Carpes, Marta Fioravante; Imhof, Beatriz Vidotto; Juk, Daniel Benedet; Souza, Gisele Cristina; Beckert, Giselle Fernanda Quintino; Cruz, Lilian Cristina; Bernardes, Mariane; Brocca, Rodrigo Vielmo
Fonte: Universidade de São Paulo. Faculdade de Medicina Publicador: Universidade de São Paulo. Faculdade de Medicina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; ; Formato: application/pdf
Publicado em 31/08/2006 POR
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36.82%
Com o crescimento, a criança revela modificações da expansibilidade do tórax. Este estudo visou verificar a mobilidade torácica em crianças saudáveis do sexo masculino com idades entre 7 e 11 anos. Foram avaliadas 91 crianças de uma escola particular em Itajaí, SC, relacionando a expansibilidade da caixa torácica, medida por cirtometria, com a idade e estatura. Os indivíduos permaneceram em sedestação, medindo-se com fita métrica o perímetro torácico nos níveis axilar, xifóide, basal e umbilical. As médias encontradas (das diferenças de expansibilidade nainspiração e expiração máxima) nos vários níveis foram: axilar, 5,06±1,73 cm; xifóide, 4,93±1,80 cm; basal, 3,83±1,60 cm; e umbilical, 3,61±1,78 cm. Foram calculados os coeficientes de correlação simples da estatura e da idade em relação às quatro médias de mobilidade. Oscoeficientes obtidos mostram que a mobilidade torácica se altera com o crescimento. A estatura é a variável que mais interfere na mobilidade torácica. Apesar de escassa, a literatura disponível refere valores semelhantes de cirtometria em crianças da mesma faixa etária. No entanto, essa mesma escassez não permite o estabelecimento de valores de normalidade para mobilidade torácica em meninos de 7 a 11 anos.; The growing child shows changes in thoracic expandability. This study aimed at verifying thoracic mobility in healthy male children (7 to 11 years old). Ninety-one children from a private school in Itajaí (SC...

Resolução de problemas envolvendo áreas e perímetros; um estudo no 5º ano de escolaridade

Nunes, Lauriana Maria Pires
Fonte: Repositório Comum de Portugal Publicador: Repositório Comum de Portugal
Tipo: Dissertação de Mestrado
Publicado em /12/2015 POR
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O presente trabalho incide num projeto de investigação desenvolvido, no ano letivo 2014/2015, no âmbito da unidade curricular Estágio no 2.º Ciclo do curso de Mestrado em Ensino do 1.º e do 2.º Ciclos do Ensino Básico. O objetivo principal deste projeto é compreender de que modo alunos do 5.º ano de escolaridade resolvem problemas que envolvem os conceitos de área e de perímetro de figuras geométricas planas. Em particular, pretende-se perceber como é que interpretam os problemas, que estratégias utilizam para os resolver e que dificuldades experienciam. No enquadramento teórico do estudo, foca-se, nomeadamente o significado de grandezas e medidas, aborda-se a aprendizagem do processo de medição e apresentam-se ideias consideradas relevantes para o ensino e a aprendizagem dos conceitos de perímetro e de área. Do ponto de vista metodológico, o estudo insere-se numa abordagem qualitativa de investigação e enquadra-se no paradigma interpretativo. Neste âmbito, foi realizada uma intervenção pedagógica em que foram propostas tarefas envolvendo os conceitos de área e de perímetro. Visando aprofundar a compreensão sobre o modo como os alunos resolvem problemas envolvendo estes conceitos, foram realizados dois estudos de caso. Os dados empíricos foram recolhidos através da observação participante...

Alternative Way to Compute the Euler Number of a Binary Image

Sossa-Azuela,J. H.; Cuevas-Jiménez,E. B.; Zaldivar-Navarro,D.
Fonte: UNAM, Centro de Ciencias Aplicadas y Desarrollo Tecnológico Publicador: UNAM, Centro de Ciencias Aplicadas y Desarrollo Tecnológico
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2011 EN
Relevância na Pesquisa
27.13%
In this paper an alternative way to compute the (E) Euler number of a binary image via information about its pixels is presented. The P perimeter of the objects in the image, their Pc contact perimeter and the T-type pixel are used to obtain this important invariant. This is the second time the Euler number is described in terms of the contact perimeter of the objects in an image but with new results. The first paper that reports computing the Euler number of a binary shape in terms of the P and Pc is in [E. Bribiesca, Computation of the Euler number using the contact perimeter, Computers and Mathematics with Applications 60:1364-137 (2010)]. Bribiesca's proposal is useful only for unit-width shapes. In this paper, we extend Bribiesca's method for non-unit-width shapes.