Mechanical System Controls
Mostrando 13-24 de 27 artigos, teses e dissertações.
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13. Design of a didactic ande experimental testbed of low cost for applications in active control of vibration / Desenvolvimento de bancada didatico-experimental de baixo custo para aplicações em controle ativo de vibrações
Este trabalho apresenta uma bancada didática destinada ao ensino nos cursos de engenharia de aplicações em projetos de controle, processamento digital de sinais e programação em tempo real. Bancadas didáticas são ferramentas indispensáveis ao ensino, considerando que os conceitos vistos apenas em sala de aula são muitas vezes abstratos. A bancada em
Publicado em: 2006
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14. Multicellular spheroids of bone marrow stromal cells: a three-dimensional in vitro culture system for the study of hematopoietic cell migration
Cell fate decisions are governed by a complex interplay between cell-autonomous signals and stimuli from the surrounding tissue. In vivo cells are connected to their neighbors and to the extracellular matrix forming a complex three-dimensional (3-D) microenvironment that is not reproduced in conventional in vitro systems. A large body of evidence indicates t
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-10
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15. Development of a manager system for calculation of machine elements for mechanical projects. / Desenvolvimento de um sistema computacional de auxílio ao cálculo e desenho de elementos de máquinas.
With a market more and more demanding in terms of efficiency and costs, one has the need to integrated all the possible information of a company, helping in this way to guarantee the quality of products and services. Moreover, nowadays there are plenty of resources to systematize the repetitive and tedious tasks, such as calculating a shaft or a pair of gear
Publicado em: 1999
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16. Avaliação da eficiência da técnica de obturação pela compressão hidrùlica vertical após instrumentação automatizada
The purpose of this study was to evaluate through radiographic and microscopic analysis the efficiency of the filling techniques by vertical hidraulic compression after the root canal mechanical instrumentation in vitro as well to evaluate the marginal apical leakage through macroscopic and microscopic analysis. Thirty human mandibular molars were used , the
Publicado em: 1999
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17. Efeitos de preparação do estado inicial na dinamica de uma particula browniana quantica
In this work we apply and develop a generalization of the Feynman-Vernon approach to the case of a quantum mechanical damped oscillator. We develop a variational method to treat the path integral that controls the dynamics of the reduced density operator of that system once this is subject to na arbitrary initial condition. The method is completely independe
Publicado em: 1989
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18. Postural stability of workers exposed to lead.
OBJECTIVE--To detect, with a computerised postural sway measurement system, any significant deviation of postural sway parameters among lead workers compared with a control group. METHODS--Postural stability was investigated with a computerised postural sway measurement system in 60 workers exposed to lead with a duration of exposure of 84 (range 3-366) mont
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19. Auto-phosphorylation of a voltage-gated K+ channel controls non-associative learning
Here, we characterize a new K+ channel–kinase complex that operates in the metazoan Caenorhabditis elegans to control learning behaviour. This channel is composed of a pore-forming subunit, dubbed KHT-1 (73% homology to human Kv3.1), and the accessory subunit MPS-1, which shows kinase activity. Genetic, biochemical and electrophysiological evidence show th
Nature Publishing Group.
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20. Cell wall mechanical properties as measured with bacterial thread made from Bacillus subtilis.
Engineering approaches used in the study of textile fibers have been applied to the measurement of mechanical properties of bacterial cell walls by using the Bacillus subtilis bacterial thread system. Improved methods have been developed for the production of thread and for measuring its mechanical properties. The best specimens of thread produced from cultu
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21. Effect of Dynamic Loading on the Transport of Solutes into Agarose Hydrogels
In functional tissue engineering, the application of dynamic loading has been shown to improve the mechanical properties of chondrocyte-seeded agarose hydrogels relative to unloaded free swelling controls. The goal of this study is to determine the effect of dynamic loading on the transport of nutrients in tissue-engineered constructs. To eliminate confoundi
The Biophysical Society.
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22. Photocrosslinking of Gelatin Macromers to Synthesize Porous Hydrogels That Promote Valvular Interstitial Cell Function
The development of novel three-dimensional cell culture platforms for the culture of aortic valvular interstitial cells (VICs) has been fraught with many challenges. Although the most tunable, purely synthetic systems have not been successful at promoting cell survivability or function. On the other hand, entirely natural materials lack mechanical integrity.
Mary Ann Liebert.
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23. Fibronectin controls capillary endothelial cell growth by modulating cell shape.
An in vitro system has been developed to study the mechanism by which fibronectin (FN) regulates capillary endothelial cell growth in the presence of soluble angiogenic mitogens. Endothelial cells were cultured in chemically defined medium containing a constant, saturating amount of basic fibroblast growth factor. Formation of cell-FN contacts was then varie
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24. QT interval dispersion in chronic heart failure and left ventricular hypertrophy: relation to autonomic nervous system and Holter tape abnormalities.
OBJECTIVE--To study QT dispersion in left ventricular hypertrophy and chronic heart failure and to determine the relation to ventricular arrhythmias. SETTING--Investigational laboratory of a tertiary referral centre. STUDY DESIGN--Patients with left ventricular hypertrophy and normal systolic function (n = 14) and patients with chronic heart failure (n = 18)