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Determinação do limiar de anaerobiose ventilatório no exercício físico dinâmico em indivíduos sadios: comparação entre métodos obtidos por análise visual e modelos matemáticos.; Determination of ventilatory anaerobic threshold in dynamic exercise of healthy subjects: comparison among methods obtained by visual analyses and mathematical models.

Crescencio, Julio César
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 24/10/2002 PT
Relevância na Pesquisa
35.95%
Os avanços tecnológicos ocorridos na última década trouxeram enormes benefícios, no sentido de possibilitar o uso de equipamentos computadorizados, que permitem a aquisição, processamento e armazenamento de um grande número de variáveis respiratórias e metabólicas em exercício físico, em tempo real e de ciclo a ciclo respiratório. Dentro deste novo cenário, o estudo realizado com esta nova geração de equipamentos, nas respectivas áreas de conhecimento, pôde ser direcionado, usando-se métodos matemáticos e estatísticos computadorizados, os quais possibilitam a aplicação de procedimentos automáticos e/ou semi-automáticos na solução de problemas específicos. É dentro deste contexto que se insere o presente estudo, que tem por objetivo comparar, em indivíduos sadios do sexo masculino, o limiar de anaerobiose ventilatório, durante o exercício físico dinâmico, usando-se métodos visuais gráficos e métodos baseados em modelos matemáticos, automáticos e semi-automáticos. Foram estudados 24 voluntários sadios do sexo masculino, com idade média de 33,8 ± 9,25 anos. Todos eles se submeteram a um ou dois testes de esforço físico dinâmico, segundo um protocolo contínuo do tipo rampa, na posição sentada...

O uso do GPS como instrumento de controle de deslocamentos dinâmicos de obras civis - aplicação na área de transportes; The use of GPS as control instrument of dynamic displacements of civil structures

Larocca, Ana Paula Camargo
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 25/06/2004 PT
Relevância na Pesquisa
35.96%
Este trabalho apresenta o desenvolvimento de metodologia para avaliar a utilização do Sistema de Posicionamento Global (GPS) como ferramenta de pesquisa no estudo do comportamento dinâmico de obras viárias. Para ser caracterizado como um instrumento de medição, foi estudada a potencialidade de um método, que se fundamenta numa forma específica de coleta e processamento de dados GPS; análise dos resíduos resultantes do processamento da dupla diferença de fase e aplicação de análise espectral para filtragem de informações indesejáveis (multicaminhamento dos sinais GPS). A coleta envolve um oscilador eletro-mecânico, especialmente projetado, que permite calibrar as medidas de amplitude e freqüência das oscilações mensuráveis pela obra sob teste. Inúmeros experimentos foram realizados em ambientes de reflexões e difrações variáveis e com diversos tipos de receptores e antenas GPS. Alguns ensaios foram realizados utilizando, simultaneamente, equipamentos como transdutores de deslocamento, acelerômetros e estações totais. Comparando os resultados obtidos, mesmo com valores prescritos em normas e códigos, afirma-se que o GPS, sob o método de coleta de dados testado, é um instrumento confiável para detecção e caracterização do comportamento dinâmico de estruturas...

Análise dinâmica da ruptura de cabos em torres autoportantes e estaiadas de linhas de transmissão; Dynamic analysis of broken conductor in lattice self-supported and guyed towers of overhead transmission lines

Bentes, Jennefer Lavor
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Dissertação Formato: application/pdf
POR
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46%
Dentre as possíveis causas na falha da transmissão de energia elétrica, o colapso de torres de linhas de transmissão (LTs) é uma problemática amplamente investigada nas últimas décadas, devido principalmente aos inúmeros acidentes registrados nas LTs em todo o mundo. Neste trabalho, o enfoque é dado à análise dinâmica associada à solicitação proveniente da ruptura de cabos, que quando atuante é capaz de desencadear um fenômeno conhecido como efeito cascata. Para a melhor compreensão da resposta das torres metálicas autoportantes e estaiadas submetidas a esse carregamento dinâmico e buscando contribuir para a determinação de critérios de projeto que visem o estabelecimento adequado de rigidez longitudinal às torres de LTs, foram desenvolvidos modelos numéricos no software ANSYS Mechanical/LS-DYNA, considerando a discretização do modelo estrutural no espaço a partir da utilização do Método de Elementos Finitos e a solução do problema dinâmico ao longo do tempo considerando o método de integração direta implícito das equações de movimento, através do método de Newmark. Inicialmente foram desenvolvidas análises estáticas, conforme considerado nos projetos atualmente. Em seguida, foram desenvolvidos dois tipos de análises dinâmicas: uma simplificada com a aplicação da solicitação através de uma função de carregamento ao longo do tempo...

Static and dynamic structural monitoring of the Santa Maria of Belém church, in Lisbon

Ramos, Luís F.; Lourenço, Paulo B.
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Conferência ou Objeto de Conferência
Publicado em //2005 ENG
Relevância na Pesquisa
35.96%
The paper details two monitoring systems implemented in the main nave of Santa Maria of Belém Church of the Monastery of Jerónimos, in Lisbon. The monitoring systems are being installed to better understand the static and dynamic behavior of the structure, with the purpose of damage detection and the improvement of seismic resistance of the monument. In the paper, preliminary investigations, numerical non-linear analyses and the first dynamic modal identification analyses are described. Also the preliminary works for the monitoring systems are presented, including the points selected for observation, the discussion of the sensors technical characteristics, as well as preliminary inspection and diagnosis. The first results of the dynamic monitoring system are shown and the future developments on the systems are presented, aiming at a full integration of all adopted techniques.; European-Indian Economic Cross Cultural Program - Contract ALA/95/23/2003/077-122.

Static and dynamic load tests comparison considering load-energy level and soil non-linearity

Pereira, J. J. Gouveia; Santos, Jaime Alberto dos; Correia, A. Gomes; Simões, T. N.
Fonte: IOS Press Publicador: IOS Press
Tipo: Artigo de Revista Científica
Publicado em //2008 ENG
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35.98%
This paper presents the results obtained from dynamic and static load tests performed in cast-inplace piles. The test piles have 22m of length and 0.60m of diameter, constructed in a sandy soil using a recoverable steel casing. Three piles were tested: i) two by dynamic load test ii) and the other companion pile by static load test. The dynamic load tests followed a procedure with two stages. Initially, a set of impacts with increasing falling height was applied. Afterwards the energy was kept constant for the maximum falling height. The records from the dynamic load tests were interpreted using CASE and CAPWAP analyses. The soil-pile parameters obtained from CAPWAP analyses were used to simulate static soil-pile response. Soil non-linearity was considered by applying a stiffness reduction factor. The static load test was performed using a hydraulic jack against a structure supported by four reaction piles. The load distribution was measured at the top and at 12 different levels of strain gauges.Aload cell was installed at the pile tip. The results obtained from these load tests are compared and discussed taking into account the load-energy level and soil non-linearity.; International Society of Soil Mechanics and Geotechnical Engineering – ISSMGE...

CS-ASA: a new computational tool for advanced analysis of steel frames

Silva,Andréa Regina Dias da; Prado,Ícaro Machado; Silveira,Ricardo Azoubel da Mota
Fonte: Escola de Minas Publicador: Escola de Minas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2013 EN
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35.95%
A new computational tool for advanced static and dynamic analyses of steel framed structures based on the Finite Element Method has been developed and is presented herein. Two sources of nonlinearity can be considered in these analyses, i.e.: the geometric, which considers the nonlinear effects of structure displacements; and the physical, which considers the nonlinear effects of the mechanical characteristics of the material used in civil construction. Loading, geometric and residual stress imperfections can also be considered. To illustrate some of the features and capabilities that differentiate this tool from existing commercial programs, static and dynamic stability analyses of some structural systems with rigid and semi-rigid connections are evaluated. The results obtained by other researchers are used to validate the nonlinear formulations and numerical solution methodologies implemented in CS-ASA, and to attest the efficiency of the structural analysis program presented herein.

Dynamic stability differences in fall-prone and healthy adults

Granata, Kevin P.; Lockhart, Thurmon E.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
35.98%
Typical stability assessments characterize performance in standing balance despite the fact that most falls occur during dynamic activities such as walking. The objective of this study was to identify dynamic stability differences between fall-prone elderly individuals, healthy age-matched adults, and young adults. Three-dimensional video-motion analysis kinematic data were recorded for 35 contiguous steps while subjects walked on a treadmill at three speeds. From this data, we estimated the vector from the center-of-mass to the center of pressure at each foot-strike. Dynamic stability of walking was computed by methods of Poincare analyses of these vectors. Results revealed that the fall-prone group demonstrated poorer dynamic stability than the healthy elderly and young adult groups. Stability was not influenced by walking velocity, indicating that group differences in walking speed could not fully explain the differences in stability. This pilot study supports the need for future investigations using larger population samples to study fall-prone individuals using nonlinear dynamic analyses of movement kinematics.

Evaluation of the Pseudostatic Analyses of Earth Dams Using FE Simulation and Observed Earthquake-Induced Deformations: Case Studies of Upper San Fernando and Kitayama Dams

Akhlaghi, Tohid; Nikkar, Ali
Fonte: Hindawi Publishing Corporation Publicador: Hindawi Publishing Corporation
Tipo: Artigo de Revista Científica
Publicado em 27/01/2014 EN
Relevância na Pesquisa
35.99%
Evaluation of the accuracy of the pseudostatic approach is governed by the accuracy with which the simple pseudostatic inertial forces represent the complex dynamic inertial forces that actually exist in an earthquake. In this study, the Upper San Fernando and Kitayama earth dams, which have been designed using the pseudostatic approach and damaged during the 1971 San Fernando and 1995 Kobe earthquakes, were investigated and analyzed. The finite element models of the dams were prepared based on the detailed available data and results of in situ and laboratory material tests. Dynamic analyses were conducted to simulate the earthquake-induced deformations of the dams using the computer program Plaxis code. Then the pseudostatic seismic coefficient used in the design and analyses of the dams were compared with the seismic coefficients obtained from dynamic analyses of the simulated model as well as the other available proposed pseudostatic correlations. Based on the comparisons made, the accuracy and reliability of the pseudostatic seismic coefficients are evaluated and discussed.

Dynamic functional connectivity analysis reveals transient states of dysconnectivity in schizophrenia

Damaraju, E.; Allen, E.A.; Belger, A.; Ford, J.M.; McEwen, S.; Mathalon, D.H.; Mueller, B.A.; Pearlson, G.D.; Potkin, S.G.; Preda, A.; Turner, J.A.; Vaidya, J.G.; van Erp, T.G.; Calhoun, V.D.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
Publicado em 24/07/2014 EN
Relevância na Pesquisa
35.96%
Schizophrenia is a psychotic disorder characterized by functional dysconnectivity or abnormal integration between distant brain regions. Recent functional imaging studies have implicated large-scale thalamo-cortical connectivity as being disrupted in patients. However, observed connectivity differences in schizophrenia have been inconsistent between studies, with reports of hyperconnectivity and hypoconnectivity between the same brain regions. Using resting state eyes-closed functional imaging and independent component analysis on a multi-site data that included 151 schizophrenia patients and 163 age- and gender matched healthy controls, we decomposed the functional brain data into 100 components and identified 47 as functionally relevant intrinsic connectivity networks. We subsequently evaluated group differences in functional network connectivity, both in a static sense, computed as the pairwise Pearson correlations between the full network time courses (5.4 minutes in length), and a dynamic sense, computed using sliding windows (44 s in length) and k-means clustering to characterize five discrete functional connectivity states. Static connectivity analysis revealed that compared to healthy controls, patients show significantly stronger connectivity...

Estudo de algoritmos de integração elemento por elemento para análise dinâmica não linear de estruturas

Vieira, Luciana Correia Laurindo Martins
Fonte: Universidade Federal de Alagoas; BR; Estruturas; Programa de Pós-Graduação em Engenharia Civil; UFAL Publicador: Universidade Federal de Alagoas; BR; Estruturas; Programa de Pós-Graduação em Engenharia Civil; UFAL
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
36.02%
The topic of structural dynamics involves an ample actuation field since the most of nature actions are time dependent. The analyses of structures in aerospace engineering, offshore engineering, civil engineering and others might be realized including the inertial effects since they have important role in reliability and safety of them. Due to the various nonlinearities that can be present in the dynamic analysis, the preview of the dynamic behavior of a structure can become a complex task. That analysis is generally executed using computational numeric algorithms improved for spatial and temporal discretization where computational requirements are excessive. Techniques based on element-by-element concept have gained recognition due to its increasing efficiency caused by the recent development of parallel computers. This work is focused on time integration algorithms for nonlinear dynamic problems formulated by the finite element approach. Besides, the considered algorithms have been prepared to be used, in the future, on parallel computational architectures. The main algorithms for nonlinear structural dynamics and alternatives of implementation of the element-by-element techniques are studied. The software MATLAB has been used for implementation of some algorithms...

Static and dynamic analysis of a reinforced concrete flat slab frame building for progressive collapse

KOKOT Seweryn; ANTHOINE Armelle; NEGRO Paolo; SOLOMOS George
Fonte: ELSEVIER SCI LTD Publicador: ELSEVIER SCI LTD
Tipo: Articles in Journals Formato: Printed
ENG
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The problem of structural progressive collapse has been investigated using a real-scale reinforced concrete flat-slab frame building, which has survived collapse after two of its central columns had been physically destroyed. The numerical study undertaken considers three loading scenarios, in which alternately three different columns are being instantaneously removed, and in each case the structural response of the frame is calculated. A finite-element linear static analysis has first been conducted. To account for severe dynamic effects occurring during fast dynamic events, such as explosions or impacts, dynamic linear and nonlinear time history analyses have next been performed. For each scenario the results have been processed in terms of demand-resistance ratios at critical cross-sections, and thus it has been assessed whether the building would be susceptible to progressive collapse according to certain allowance criteria prescribed in technical guidelines. In this respect, three definitions of dynamic factors are introduced and their effective applicability is assessed in view of actually calculated and guidelines-suggested values. Results show overall that the approaches of linear static and dynamic analyses would have produced progressive collapse conditions. The nonlinear dynamic analysis predicts no mechanism which might lead to progressive collapse...

Development of a three dimensional perfectly matched layer for transient elasto-dynamic analyses

Johnson, Anthony N.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Formato: xvi, 135 p. : ill. ; 28 cm.
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55.9%
A time dependent, three dimensional finite element approach to the development of a perfectly matched layer for numerical calculations of surface wave radiation in a half space is presented. The development of this new element required the coupling of a system of linear, second-order, partial differential equations which describe elastic wave propagation into a single weak-form (Galerkin) wave equation, from which the characteristics of a composite finite element matching layer were derived. An important problem of interest, and the motivation for this work, is the optimization of a source for use in a seismo-acoustic sonar for the detection of buried mines. Various source excitations are presented which maximize the energy of the unidirectional Rayleigh wave while suppressing the energy of associated body waves. The hp-adaptive finite element code SAFE-T (Solid Adaptive Finite Element - Transient), a Finite Element Method (FEM) implementation developed by the author utilizing Altair Engineering's Prophlex kernel, is used to perform the numerical computations. Results for radial and vertical wave strengths are given. This work represents an important step forward in the development of tools needed to pursue seismo-acoustic sonar technology for buried mine detection...

Combined static and dynamic mutability analysis

Artzi, Shay; Ernst, Michael D.; Glasser, David; Kiezun, Adam
Fonte: MIT - Massachusetts Institute of Technology Publicador: MIT - Massachusetts Institute of Technology
Formato: 10 p.; 176363 bytes; 1038435 bytes; application/pdf; application/postscript
EN_US
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35.95%
Knowing which method parameters may be mutated during a method'sexecution is useful for many software engineering tasks. We presentan approach to discovering parameter immutability, in which severallightweight, scalable analyses are combined in stages, with each stagerefining the overall result. The resulting analysis is scalable andcombines the strengths of its component analyses. As one of thecomponent analyses, we present a novel, dynamic mutability analysisand show how its results can be improved by random input generation.Experimental results on programs of up to 185 kLOC demonstrate that,compared to previous approaches, our approach increases both scalabilityand overall accuracy.

Composition of Dynamic Analysis Aspects

Ansaloni, Danilo; Moret, Philippe; Binder, Walter; Tanter, Éric Pierre
Fonte: Universidade do Chile Publicador: Universidade do Chile
Tipo: Artículo de revista
EN
Relevância na Pesquisa
36.03%
Artículo de publicación ISI; Aspect-oriented programming provides a convenient high-level model to define several kinds of dynamic analyses, in particular thanks to recent advances in exhaustive weaving in core libraries. Casting dynamic analyses as aspects allows the use of a single weaving infrastructure to apply different analyses to the same base program, simultaneously. However, even if dynamic analysis aspects are mutually independent, their mere presence perturbates the observations of others: this is due to the fact that aspectual computation is potentially visible to all aspects. Because current aspect composition approaches do not address this kind of computational interference, combining different analysis aspects yields at best unpredictable results. It is also impossible to flexibly combine various analyses, for instance to analyze an analysis aspect. In this paper we show how the notion of execution levels makes it possible to effectively address these composition issues. In order to realize this approach, we explore the practical and efficient integration of execution levels in a mainstream aspect language, AspectJ. We report on a case study of composing two out-of-the-box analysis aspects in a variety of ways, highlighting the benefits of the approach.; Swiss National Science Foundation

Prevalence of physical activity behaviour in older people: Findings from the Dynamic Analyses to Optimise Ageing (DYNOPTA) project and Australian national survey data

Sims, Jane; Birrell, Carole; Hunt, Susan; Browning, Colette; Burns, Richard; Mitchell, Paul
Fonte: Blackwell Publishing Ltd Publicador: Blackwell Publishing Ltd
Tipo: Artigo de Revista Científica
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45.83%
Aim: Many older people lead sedentary lives. National Health Survey physical activity prevalence data provide limited coverage of the 'old old' (≥75 years). Method: The Dynamic Analyses to Optimise Ageing (DYNOPTA) project's dataset provided physical ac

Understanding ageing in older Australians: The contribution of the Dynamic Analyses to Optimise Ageing (DYNOPTA) project to the evidence base and policy

Anstey, Kaarin; Bielak, Allison; Birrell, Carole; Browning, Colette; Burns, Richard; Byles, Julie; Kiely, Kim; Nepal, Binod; Ross, Lesley; Steel, David; Windsor, Timothy
Fonte: Blackwell Publishing Ltd Publicador: Blackwell Publishing Ltd
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
45.83%
Aim: To describe the Dynamic Analyses to Optimise Ageing (DYNOPTA) project and illustrate its contributions to understanding ageing through innovative methodology, and investigations on outcomes based on the project themes. DYNOPTA provides a platform and

Design and Implementation of a Tracer Driver: Easy and Efficient Dynamic Analyses of Constraint Logic Programs

Langevine, Ludovic; Ducasse, Mireille
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 25/04/2008
Relevância na Pesquisa
45.94%
Tracers provide users with useful information about program executions. In this article, we propose a ``tracer driver''. From a single tracer, it provides a powerful front-end enabling multiple dynamic analysis tools to be easily implemented, while limiting the overhead of the trace generation. The relevant execution events are specified by flexible event patterns and a large variety of trace data can be given either systematically or ``on demand''. The proposed tracer driver has been designed in the context of constraint logic programming; experiments have been made within GNU-Prolog. Execution views provided by existing tools have been easily emulated with a negligible overhead. Experimental measures show that the flexibility and power of the described architecture lead to good performance. The tracer driver overhead is inversely proportional to the average time between two traced events. Whereas the principles of the tracer driver are independent of the traced programming language, it is best suited for high-level languages, such as constraint logic programming, where each traced execution event encompasses numerous low-level execution steps. Furthermore, constraint logic programming is especially hard to debug. The current environments do not provide all the useful dynamic analysis tools. They can significantly benefit from our tracer driver which enables dynamic analyses to be integrated at a very low cost.; Comment: To appear in Theory and Practice of Logic Programming (TPLP)...

Kinematic and Dynamic Analyses of the Orthoglide 5-axis

Ur-Rehman, Raza; Caro, Stéphane; Chablat, Damien; Wenger, Philippe
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 18/09/2008
Relevância na Pesquisa
45.9%
This paper deals with the kinematic and dynamic analyses of the Orthoglide 5-axis, a five-degree-of-freedom manipulator. It is derived from two manipulators: i) the Orthoglide 3-axis; a three dof translational manipulator and ii) the Agile eye; a parallel spherical wrist. First, the kinematic and dynamic models of the Orthoglide 5-axis are developed. The geometric and inertial parameters of the manipulator are determined by means of a CAD software. Then, the required motors performances are evaluated for some test trajectories. Finally, the motors are selected in the catalogue from the previous results.

Domain Decomposition Method for Calculating the Failure Probability of Linear Dynamic Systems Subjected to Gaussian Stochastic Loads

Katafygiotis, Lambros; Cheung, Sai Hung
Fonte: American Society of Civil Engineers Publicador: American Society of Civil Engineers
Tipo: Article; PeerReviewed Formato: application/pdf
Publicado em /05/2006
Relevância na Pesquisa
35.94%
In this paper the problem of calculating the probability of failure of linear dynamic systems subjected to random vibrations is considered. This is a very important and challenging problem in structural reliability. The failure domain in this case can be described as a union of linear failure domains whose boundaries are hyperplanes. Each linear limit state function can be completely described by its own design point, which can be analytically determined, allowing for an exact analytical calculation of the corresponding failure probability. The difficulty in calculating the overall failure probability arises from the overlapping of the different linear failure domains, the degree of which is unknown and needs to be determined. A novel robust reliability methodology, referred to as the domain decomposition method (DDM), is proposed to calculate the probability that the response of a linear system exceeds specified target thresholds. It exploits the special structure of the failure domain, given by the union of a large number of linear failure regions, to obtain an extremely efficient and highly accurate estimate of the failure probability. The number of dynamic analyses to be performed in order to determine the failure probability is as low as the number of independent random excitations driving the system. Furthermore...

Dynamic analyses of liquid storage tanks

Haroun, Medhat Ahmed
Fonte: California Institute of Technology Publicador: California Institute of Technology
Tipo: Report or Paper; PeerReviewed Formato: application/pdf
Publicado em 01/01/1980
Relevância na Pesquisa
35.96%
Theoretical and experimental investigations of the dynamic behavior of cylindrical liquid storage tanks are conducted to seek possible improvements in the design of such tanks to resist earthquakes. The study is carried out in three phases: 1) a detailed theoretical treatment of the liquid-shell system, 2) an experimental investigation of the dynamic characteristics of full-scale tanks, and 3) a development of an improved design-procedure based on an approximate analysis. Natural frequencies of vibration and the associated mode shapes are found through the use of a discretization scheme in which the elastic shell is modeled by finite elements and the fluid region is treated as a continuum by boundary solution techniques. In this approach, the number of unknowns is substantially less than in those analyses where both tank wall and fluid are subdivided into finite elements. A method is presented to compute the earthquake response of both perfect circular and irregular tanks; it is based on superposition of the free lateral vibrational modes. Detailed numerical examples are presented to illustrate the applicability and effectiveness of the analysis and to investigate the dynamic characteristics of tanks with widely different properties. Ambient and forced vibration tests are conducted on three full-scale water storage tanks to determine their dynamic characteristics. Comparison with previously computed mode shapes and frequencies shows good agreement with the experimental results...