Instantaneous Rate Of Change
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Effect of compatibilization and reprocessing on the isothermal crystallization kinetics of polypropylene/wood flour composites
Numerous studies have focused on polymer mixtures aimed at the potential applications of these materials. This work analyzed the effect of polymer reprocessing and the type and concentration of compatibilizer on the isothermal crystallization kinetics of polypropylene/wood flour composites. The composites, which were polypropylene grafted with acrylic acid (
Polímeros. Publicado em: 28/05/2013
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2. Uma proposta para o ensino de noções de Cálculo no Ensino Médio
Este trabalho pretende discutir uma proposta de inclusão do ensino de noções de Cálculo Diferencial no Ensino Médio. Também comento a inclusão do ensino de Cálculo no currículo escolar e como é abordado atualmente em alguns livros didáticos adotados no ensino médio. A seguir, são apresentadas duas propostas de atividades que envolvem a introduç
Publicado em: 2011
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3. Argumentos e metáforas conceituais para a taxa de variação
The aim of this investigation was to identify and to analyze arguments and metaphors used by a group of students of a masters degree course in Mathematical Education for the rate of change, to understand how they learn this topic. The option of working with those subjects relapsed in the fact that they are all teachers of Mathematics and they have already se
Publicado em: 2006
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4. Transposition Rates of Mycobacterium tuberculosis IS6110 Restriction Fragment Length Polymorphism Patterns
To determine the rate at which IS6110 restriction fragment length polymorphism (RFLP) patterns in Mycobacterium tuberculosis change over time, we applied a smooth nonparametric survival model to several data sets, including data from previous publications on the rate of change. The results strongly suggest a simple parametric model, with an instantaneous cha
American Society for Microbiology.
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5. Instantaneous mitral valve leaflet velocity and its relation to left ventricular wall movement in normal subjects.
Echocardiograms showing mitral valve leaflets, interventricular septum, and posterior wall of the left ventricle simultaneously were recorded at a paper speed of 100 mm/s in 20 normal subjects. These records were manually digitized and a computer was used to derive mitral valve velocity, left ventricular dimension, and its rate of change continuously through
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6. Simultaneous changes in the equilibrium potential and potassium conductance in voltage clamped Ranvier node in the frog.
1. In voltage clamped myelinated nerve fibres, the K+ conductance has been calculated from current recordings obtained in low and high K+ media, taking into account the changes in EK resulting from accumulation of depletion of K+ ions near to nodal membrane. 2. At the end of a depolarization, the instantaneous K+ current reverses at a potential (instantaneou
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7. The Mechanical Behavior of Isolated Avena Coleoptile Walls Subjected to Constant Stress: Properties and Relation to Cell Elongation 1
In order to assess the role of the mechanical properties of the wall in auxin-induced cell elongation, a study has been made of the ability of isolated Avena coleoptile walls to extend (creep) when subjected to a constant applied stress. Creep occurs as a viscoelastic extension which has the following characteristics: the extension is proportional to log tim
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8. Kinetics of inward rectifier gating in the eggs of the marine polychaete, Neanthes arenaceodentata.
Potassium current through the inward rectifier of Neanthes arenaceodentata eggs was studied using a voltage-clamp technique. The instantaneous conductance, steady-state conductance and the time constant of current relaxation were analysed as functions of the membrane potential and the external potassium concentration ([K]o). Both the instantaneous and the st
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9. An analysis of neural receptive field plasticity by point process adaptive filtering
Neural receptive fields are plastic: with experience, neurons in many brain regions change their spiking responses to relevant stimuli. Analysis of receptive field plasticity from experimental measurements is crucial for understanding how neural systems adapt their representations of relevant biological information. Current analysis methods using histogram e
The National Academy of Sciences.
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10. Alterations in the mechanical properties of the lung during dyspnea in chronic obstructive pulmonary disease
The mechanical properties of the lungs in seven patients with chronic obstructive pulmonary disease (COPD) were measured before and during dyspnea on exertion, as well as when relief with added oxygen was obtained. Mean pulmonary dynamic compliance was 0.091 liters/cm of H2O before dyspnea, 0.057 during dyspnea, and 0.101 liters/cm H2O during relief. During
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11. Use of digitised left ventricular echocardiograms in assessment of mitral stenosis.
In order to establish a new echocardiographic index of the severity of mitral stenosis, left ventricular echocardiograms were digitised using manual tracing and a computer. The instantaneous left ventricular dimension was measured in 15 patients with mitral stenosis. The peak rate of change of left ventricular dimension (peak dD/dt) and the normalised peak r
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12. Pressure-flow studies in man: effect of atrial systole on ventricular function in mitral stenosis
The effect of atrial contraction on left ventricular function in six patients with varying degrees of mitral stenosis was determined by utilizing the pressure gradient technique to measure instantaneous aortic blood flow and pressure. Aortic flow was measured as ventricular rate was controlled by right ventricular pacing to create A-V (atrioventricular) diss