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Literatura académica sobre el tema "VO2 kinetic"

Autor: Grafiati

Publicado: 11 de marzo de 2023

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Artículos de revistas sobre el tema "VO2 kinetic"

Xing, H. C., J. E. Cochrane, Y. Yamamoto y R. L. Hughson. "Frequency domain analysis of ventilation and gas exchange kinetics in hypoxic exercise". Journal of Applied Physiology 71, n.º 6 (1 de diciembre de 1991): 2394–401. http://dx.doi.org/10.1152/jappl.1991.71.6.2394.

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The kinetics of O2 up-take (VO2), CO2 output (VCO2), ventilation (VE), and heart rate (HR) were studied during exercise in normoxia and hypoxia [inspired O2 fraction (FIO2) 0.14]. Eight male subjects each completed 6 on- and off-step transitions in work rate (WR) from low (25 W) to moderate (100–125 W) levels and a pseudorandom binary sequence (PRBS) exercise test in which WR was varied between the same WRs. Breath-by-breath data were linearly interpolated to yield 1-s values. After the first PRBS cycle had been omitted as a warm-up, five cycles were ensemble-averaged before frequency domain analysis by standard Fourier methods. The step data were fit by a two-component (three for HR) exponential model to estimate kinetic parameters. In the steady state of low and moderate WRs, each value of VO2, VCO2, VE, and HR was significantly greater during hypoxic than normoxic exercise (P less than 0.05) with the exception of VCO2 (low WR). Hypoxia slowed the kinetics of VO2 and HR in on- and off-step transitions and speeded up the kinetics of VCO2 and VE in the on-transition and of VE in the off-transition. Frequency domain analysis confined to the range of 0.003–0.019 Hz for the PRBS tests indicated reductions in amplitude and greater phase shifts in the hypoxic tests for VO2 and HR at specific frequencies, whereas amplitude tended to be greater with little change in phase shift for VCO2 and VE during hypoxic tests.(ABSTRACT TRUNCATED AT 250 WORDS)

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Larson, Rebecca D., Monica Barton, John W. Farrell III, Gregory S. Cantrell, David J. Lantis, Christopher D. Black y Carl J. Ade. "Evaluation of Oxygen Uptake Kinetic Asymmetries in Patients with Multiple Sclerosis: A Pilot Study". International Journal of Kinesiology and Sports Science 6, n.º 4 (31 de octubre de 2018): 21. http://dx.doi.org/10.7575/aiac.ijkss.v.6n.4p.21.

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Background of Study: Observations of limb to limb differences (bilateral asymmetry) in leg strength, power, peak oxygen uptake (VO2) and bone mineral density has been reported in individuals with Multiple Sclerosis (MS). Objetives: The purpose of this study was to quantify the magnitude of bilateral asymmetries in oxygen uptake (VO2) kinetics response to single leg cycling (SLC) in relapsing-remitting multiple sclerosis (MS) patients. Methods: Five MSpatients (2 men, 3 women; age 43±7 yrs) performed constant work rate SLC trials to determine VO2 kinetics in each leg. Asymmetry scores were used to quantify the magnitude of the bilateral asymmetries. Results: Significant asymmetries were seen in VO2 peak and parameters of VO2 kinetics. VO2peak asymmetry score was significantly different than 0% (p=0.015). Similarly,significant asymmetry for VO2 kinetic response to exercise as mean response time was observed (p=0.03). In addition the VO2 response to exercise resulted in a significant asymmetry in VO2 deficit between legs (p=0.03). No correlation between EDSS scores and any asymmetry scores existed. Conclusions: These findings provide insight into the potential differences in metabolic perturbation and limb specific symptomatic fatigue within the MS population.

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Buekers, Joren, Jan Theunis, Alberto Peña Fernández, Emiel F. M. Wouters, Martijn A. Spruit, Patrick De Boever y Jean-Marie Aerts. "Box-Jenkins Transfer Function Modelling for Reliable Determination of VO2 Kinetics in Patients with COPD". Applied Sciences 9, n.º 9 (1 de mayo de 2019): 1822. http://dx.doi.org/10.3390/app9091822.

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Oxygen uptake (VO2) kinetics provide information about the ability to respond to the increased physical load during a constant work rate test (CWRT). Box-Jenkins transfer function (BJ-TF) models can extract kinetic features from the phase II VO2 response during a CWRT, without being affected by unwanted noise contributions (e.g., phase I contribution or measurement noise). CWRT data of 18 COPD patients were used to compare model fits and kinetic feature values between BJ-TF models and three typically applied exponential modelling methods. Autocorrelation tests and normalised root-mean-squared error values (BJ-TF: 2.8 ± 1.3%; exponential methods A, B and C: 10.5 ± 5.8%, 11.3 ± 5.2% and 12.1 ± 7.0%; p < 0.05) showed that BJ-TF models, in contrast to exponential models, could account for the most important noise contributions. This led to more reliable kinetic feature values compared to methods A and B (e.g., mean response time (MRT), BJ-TF: 74 ± 20 s; methods A-B: 100 ± 56 s–88 ± 52 s; p < 0.05). Only exponential modelling method C provided kinetic feature values comparable to BJ-TF features values (e.g., MRT: 75 ± 20 s). Based on theoretical considerations, we recommend using BJ-TF models, rather than exponential models, for reliable determinations of VO2 kinetics.

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Morton, R. H. "Delayed or accelerated oxygen uptake kinetics in the transition from prior exercise?" Journal of Applied Physiology 62, n.º 2 (1 de febrero de 1987): 844–46. http://dx.doi.org/10.1152/jappl.1987.62.2.844.

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Reported experimental findings are at variance with each other on the question as to whether O2 uptake (VO2) kinetics are delayed, advanced, or remain unaltered in the transition from prior exercise. Critical examination of these studies tend to suggest that not a great deal of reliance can be placed on their evidence in attempting to resolve the question. They seem to display a disregard for the theoretical properties of the VO2 kinetic model used; in some cases incorrect statistical inferences appear to have been made; most are mathematically incomplete; and the experimental designs have not been appropriately chosen so as to examine the whole question of altered VO2 kinetics. These points are detailed and discussed so that future designed experiments obtain sufficient reliable evidence with which to resolve the question.

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Shoemaker, J. K., L. Hodge y R. L. Hughson. "Cardiorespiratory kinetics and femoral artery blood velocity during dynamic knee extension exercise". Journal of Applied Physiology 77, n.º 6 (1 de diciembre de 1994): 2625–32. http://dx.doi.org/10.1152/jappl.1994.77.6.2625.

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The kinetics of femoral artery mean blood velocity (MBV; measured by pulsed Doppler) and whole body oxygen uptake (VO2; measured breath by breath) were assessed from the time constant during the on (tau on) and off (tau off) transients to step changes in work rate between complete rest and dynamic knee extension (KE) exercise. Six healthy men performed 5 min of seated KE exercise, with each leg alternately raising and lowering a weight (10% maximum voluntary contraction) over a 2-s duty cycle. Because kinetic analysis of VO2 kinetics during KE exercise is a new approach, the VO2 responses were also evaluated during the on and off transitions to the more familiar upright cycling exercise in which the magnitude of increase in VO2 and cardiac output was similar to that during KE exercise. During KE exercise, VO2 tau on [mean 72.2 +/- 11.2 (SE) s] was slower than VO2 tau off (33.3 +/- 1.8 s; P < 0.01). Cardiac output, measured with impedance cardiography, was not different for tau on (67.1 +/- 20.0 s) compared with that for tau off (52.9 +/- 7.6 s). Likewise, MBV tau on (34.5 +/- 3.9 s) was not different from tau off (35.3 +/- 3.2 s). During cycling, the VO2 tau on (18.0 +/- 2.4 s) and tau off (30.7 +/- 1.2 s) were both faster than KE VO2 tau on (P < 0.01). Even though the MBV kinetics indicated a rapid adaptation of blood flow during KE exercise, there was a slow adaptation of VO2. A transient hyperemia immediately on cessation of KE exercise, indicated by both MBV and calculated systemic vascular conductance responses, suggested that blood flow might have been inadequate and could have contributed to the delayed adaptation of VO2 at the onset of exercise, although other explanations are possible.

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Lin, Xueyan, Wenyue Li, Xuan Pan, Shu Wang y Zhaoyang Fan. "Electrocatalytic and Conductive Vanadium Oxide on Carbonized Bacterial Cellulose Aerogel for the Sulfur Cathode in Li-S Batteries". Batteries 9, n.º 1 (26 de diciembre de 2022): 14. http://dx.doi.org/10.3390/batteries9010014.

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Many transition-metal-oxide-based catalysts have been investigated to chemically bind soluble lithium polysulfides and accelerate their redox kinetics in lithium-sulfur (Li-S) battery chemistry. However, the intrinsic poor electrical conductivities of these oxides restrict their catalytic performance, consequently limiting the sulfur utilization and the rate performance of Li-S batteries. Herein, we report a freestanding electrocatalytic sulfur host consisting of hydrogen-treated VO2 nanoparticles (H-VO2) anchored on nitrogen-doped carbonized bacterial cellulose aerogels (N-CBC). The hydrogen treatment enables the formation and stabilization of the rutile VO2(R) phase with metallic conductivity at room temperature, significantly enhancing its catalytic capability compared to the as-synthesized insulative VO2(M) phase. Several measurements characterize the electrocatalytic performance of this unique H-VO2@N-CBC structure. In particular, the two kinetic barriers between S8, polysulfides, and Li2S are largely reduced by 28.2 and 43.3 kJ/mol, respectively. Accordingly, the Li-S battery performance, in terms of sulfur utilization and charge/discharge rate, is greatly improved. This work suggests an effective strategy to develop conductive catalysts based on a typical transition metal oxide (VO2) for Li-S batteries.

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Phillips, S. M., H. J. Green, M. J. MacDonald y R. L. Hughson. "Progressive effect of endurance training on VO2 kinetics at the onset of submaximal exercise". Journal of Applied Physiology 79, n.º 6 (1 de diciembre de 1995): 1914–20. http://dx.doi.org/10.1152/jappl.1995.79.6.1914.

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The rates of increase in O2 uptake (VO2) after step changes in work rate from 25 W to 60% of pretraining peak VO2 (VO2 peak) were measured at various times during an endurance training program (2 h/day at 60% pretraining VO2 peak). Seven untrained males [23 +/- 1 (SE) yr] performed a series of repeated step changes in work rate before training (PRE) and after 4 days (4D), 9 days (9D), and 30 days (30D) of training. VO2 kinetic responses were determined from breath-by-breath data averaged across four repetitions and analyzed using a two-component exponential model. Mean response time (time taken to reach 63% of steady-state VO2) was faster (P < 0.01) than PRE (38.1 +/- 2.6 s) at both 4D (34.9 +/- 2.4 s) and 9D (32.5 +/- 1.8 s) and was faster (P < 0.01) at 30D than at all other times (28.3 +/- 1.0 s). Blood lactate concentrations (after 6 min of cycling) were also lower at 4D and 9D than PRE (P < 0.01) and were lower at 30D than at all other times (P < 0.01). VO2 peak was unchanged from PRE (3.52 +/- 0.20 l/min) at 8D (3.55 +/- 0.20 l/min) but was increased (P < 0.01) at 30D (3.89 +/- 0.18 l/min). Muscle oxidative capacity (maximal citrate synthase activity) was not significantly increased until 30D (P < 0.01). It is concluded that at least part of the acceleration of whole body VO2 kinetics with endurance training is a rapid phenomenon, occurring before changes in VO2 peak and/or muscle oxidative potential.

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Hughson, R. L., J. E. Cochrane y G. C. Butler. "Faster O2 uptake kinetics at onset of supine exercise with than without lower body negative pressure". Journal of Applied Physiology 75, n.º 5 (1 de noviembre de 1993): 1962–67. http://dx.doi.org/10.1152/jappl.1993.75.5.1962.

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The kinetics of oxygen uptake (VO2) were observed at the onset of submaximal cycling exercise in seven men and one woman [mean age 22.6 +/- 0.9 (SE) yr] in the upright and supine positions and the supine position with -40 mmHg lower body negative pressure (LBNP). There was no significant difference for peak VO2 and ventilatory threshold between the supine (3,081 +/- 133 and 1,954 +/- 138 ml/min, respectively) and the supine + LBNP positions (3,062 +/- 152 and 1,973 +/- 122 ml/min); however, both were reduced compared with upright exercise (3,483 +/- 200 and 2,353 +/- 125 ml/min). Kinetic analysis applied to six repetitions by each subject indicated a slowing from a mean total lag time (time required to achieve 63% of the difference in VO2 between baseline and new steady state) of 36.3 +/- 2.7 s in upright exercise to 44.1 +/- 3.5 s in the supine position. However, total lag time for the supine + LBNP position (36.0 +/- 2.8 s) did not differ from upright exercise but was significantly faster than supine exercise. These data have been interpreted in support of an O2 transport limitation to VO2 kinetics at the onset of supine exercise that is countered by LBNP, likely through a more rapid increase in perfusion to the exercising muscle at these submaximal work rates.

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Wilkerson, Daryl P., Katrien Koppo y Andrew M. Jones. "Pulmonary Vo2 On-kinetic Response To Step Exercise". Medicine & Science in Sports & Exercise 37, Supplement (mayo de 2005): S362—S363. http://dx.doi.org/10.1249/00005768-200505001-01896.

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Wilkerson, Daryl P., Katrien Koppo y Andrew M. Jones. "Pulmonary Vo2 On-kinetic Response To Step Exercise". Medicine & Science in Sports & Exercise 37, Supplement (mayo de 2005): S362???S363. http://dx.doi.org/10.1097/00005768-200505001-01896.

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Más fuentes

Tesis sobre el tema "VO2 kinetic"

Popuri, Srinivasa Rao. "Etude expérimentale des relations structure-propriétés et des effets de dimensionnalité dans des oxydes de cobalt et de vanadium". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2012. http://tel.archives-ouvertes.fr/tel-00927123.

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Les oxydes doubles lamellaires de cobalt et les oxydes de vanadium ont récemment suscité un vifintérêt suite à la découverte de leurs propriétés thermoélectriques prometteuses. Nos efforts visentà synthétiser de nouveaux composés dérivés de ces systèmes en utilisant la synthèse à l'étatsolide, l'échange d'ions et/ou les techniques hydrothermales. Afin de moduler et d'optimiser leurscaractéristiques thermoélectriques, nous avons ajusté la composition des oxydes de cobalt grâce àdes substitutions appropriées. Au sein du dioxyde de vanadium quasi-1D, nous avons considérétrois différentes structures polymorphes : M1, A et B. Nous avons exploré les différents systèmesen construisant l'ensemble des diagrammes de phases. Nous avons également étudié l'effet de lasubstitution du vanadium par le molybdène et le chrome sur la stabilité de ces structurespolymorphes et caractérisé leurs propriétés électroniques en relation avec les mécanismes detransition de phase.

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Jakaitė, Jurgita. "18-22 metų merginų, sergančių 1 tipo cukriniu diabetu, greitosios adaptacijos aerobiniams ėjimo krūviams ypatumai". Master's thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120620_134458-38602.

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Hipotezė: 1 tipo cukriniu diabetu sergančių merginų vegetacinių sistemų rodiklių pokyčiai krūvio metu bus didesni, nei šokėjų ir nesportuojančių. Tikslas: Įvertinti 18-22 1 tipo cukriniu diabetu sergančių merginų, greitosios adaptacijos aerobiniams ėjimo krūviams, ypatumus. Tiriamieji: 10 šokėjų, 12 nesportuojančių sveikų merginų, ir 12 sergančių 1 tipo cukriniu diabetu merginų. Tyrimo metodai: 1. Kūno kompozicija 2. dujų analizė 3. pulsometrija 4. biocheminė kraujo analizė 5. standartinis šešių minučių ėjimo krūvis bėgtakiu 6. matematinė statistika. Tyrimo organizavimas: Tyrimas atliktas 2011-2012 metais. Tyrime dalyvavo 34 merginos, kurios buvo suskirstytos į 3 grupes: I grupę sudarė 1 tipo cukriniu diabetu sergančios merginos (n=12), II grupę šokėjos (n=10), III grupę nesportuojančios sveikos merginos (n=12). Tiriamosios buvo 18-22 metų amžiaus. Tiriamosios, atvykusios į Lietuvos kūno kultūros akademijos sporto fiziologijos labaratorija, buvo supažindintos su tyrimu. Prieš tyrimą tiriamosioms buvo atlikta kūno sudėties analizė su „Tanita TBF-300-A “ svartyklėmis. “Tanita TBF-300-A” svarstyklėmis buvo nustatyta tiriamųjų: kūno masė, KMI (kūno masės indeksas), riebalų masė (%), riebalų masė (kg). Visos tyrime dalyvavusios merginos atliko 6 minučių standartinį ėjimo testą bėgtakiu VIASYS LE 200 CE (Vokietija) pagal (1 tyrimo protokolą). 6 minučių standartinio ėjimo testo metu buvo atliktas tiesioginis MDS nustatymas dujų analizatoriumi „Oxycon Mobile“ (Jaeger, Vokietija)... [toliau žr. visą tekstą]
Hypothesis: We thought that type 1 diabetic girls vegetative system parameters during exercise will be higher than the dancers and untrained. The aim of the study: To evaluate the type 1 diabetic quick adaptation of aerobic walking loads, characteristics Subjects: 10 dancers, 12 untrained healthy women, 12 patients with type 1 diabetic women. The methods of the study: 1. Body composition 2. gas analysis 3. pulsometry 4. biochemical blood analysis 5. standard 6-minute treadmill walk test 6. mathematical statistics. The organization of the study: The study was conducted from 2011 to 2012 years. The study included 34 women were divided into 3 groups: group I consisted of type 1 diabetic girls (n = 12), group II dancers (n = 10), III group of healthy untrained girls (n = 12). The participants were between 18-22 years of age. Before the study subjects was performed body composition analysis with Tanita TBF-300-A."Tanita TBF-300-A subjects were found on scales: body weight, BMI (body mass index), fat mass (%), fat mass (kg).All the girls participated in the study, carried out a standard 6-minute treadmill walk test VIASYS LE 200 CE (Germany) in accordance with (1 TABLE). Standard 6-minute walk test was carried out directly by the gas analyzer MDS "Oxycon Mobile (Jaeger, Germany). Total 6-minute walk test in a standard treadmill VIASYS LE 200 CE (Germany) and recovery time using a portable system Oxycon Mobile has been recorded in gas exchange rates of oxygen consumption (VO2)... [to full text]

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Troll, Clemens. "Kinetische Berechnung von Rast-in-Rast-Bewegungen für Mechanismen". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-230746.

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Gegenstand dieses Beitrags ist eine Methode zur kinetischen Berechnung antriebsentlastender Vorgaben für Rast-in-Rast-Bewegungen bei Mechanismen mit dem Laufgrad 1. Dabei werden die Vorteile der Vorgabe eines Antriebsmomentenprofils über dem Weg aufgezeigt und die numerischen Herausforderungen bei der Anwendung dieser Methode diskutiert. Anhand eines Praxisbeispiels wird diese Methode mit anderen aus dem Stand der Technik bekannten Verfahren verglichen und die entsprechenden Lösungen werden gegenübergestellt
The subject of this paper is a method for the kinetic calculation of drive relieving rise to dwell motions for mechanisms with the degree of freedom of 1. The advantages of specifying a drive torque profile over the path2 are pointed out. Furthermore the numerical challenges in the application of this approach are discussed. By means of a practical example, both the new method as well as known methods and their corresponding solutions are compared

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Eurich, Frank [Verfasser]. "Coarse-grained models for the kinetics of polymeric systems = Vergröberte Modelle zur Beschreibung der Kinetik von Polymersystemen / vorgelegt von Frank Eurich". Berlin : dissertation.de, 2002. http://d-nb.info/968379435/34.

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Machado, Carlos Eduardo Polazzo [UNESP]. "Efeitos do exercício prévio de intensidade supramáxima sobre a cinética do consumo de oxigênio em ciclistas treinados". Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/87365.

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O surgimento de equipamentos que permitem a análise do consumo de oxigênio (VO2) respiração-a- respiração, tem despertado um grande interesse nos fatores que podem influenciar sua cinética no início do exercício (resposta on). Entre os fatores mais estudados, temos a intensidade do exercício e o nível do treinamento dos sujeitos. Estes dados sugerem que a influência do exercício prévio sobre o VO2 durante o exercício incremental só ocorreria em baixas intensidades de esforço (< 60% VO2max). Os objetivos deste estudo foram: a) analisar a influência do exercício supramáximo realizado previamente, sobre os parâmetros da cinética do VO2 durante a transição repouso-exercício realizado a 50 e 70% VO2max, e b) analisar a influência do exercício supramáximo realizado previamente sobre as respostas cardiorrespiratórias e metabólicas durante o exercício de carga constante realizado a 50 e 70% VO2max. Para este estudo foram utilizados 14 ciclistas bem treinados do sexo masculino (VO2max = 63,4 + 6,5 ml.kg-1.min-1; idade = 21,4 + 3,5 anos; massa corporal = 68,1 + 6,8 kg; estatura = 174,9 + 4,6 cm) que executaram cinco testes: 1) exercício contínuo progressivo até a exaustão voluntária para a determinação do VO2max e as cargas correspondentes a 50, 70 e 120% VO2max e; 2) Quatro testes de carga constante, executados de forma aleatória e em dias separados. Nestes testes os sujeitos pedalaram durante 20 minutos em duas diferentes intensidades de exercício (50 e 70% do VO2max), realizados com e sem a execução prévia de um exercício supramáximo (120% VO2max). Foi analisada a resposta on do VO2 e também as respostas cardiorrespiratórias e metabólicas durante 20 minutos de exercício com carga constante realizados a 50 e 70% VO2max...
The appearance of an equipment that permits the oxygen consumption analysis (VO2) breath by breath has arisen a huge interest in factors which can influence its dynamics in the beginning of exercise (on response). Among the more studied factors, are the exercise intensity and training status. Meanwhile, few studies have analyzed the possible effects of previous exercise on the VO2response during exercise at moderate domain. In our lab, we have verified recently that during an incremental test performed eight minutes after a supramaximum exercise (120% VO2max), there was a significant VO2 increase in the first stage, while, at the intensities between 60% and VO2max, no alteration of VO2 was found, in accordance with the results existent in the literature. These results suggest that the influence of a previous exercise on the VO2 during the incremental exercise would just occur at low intensities (< 60% VO2 max). This model, meanwhile, does not permit to isolate a possible time effect of the exercise, once the highest intensities were always done after two or three stages, which could have favored a recovery, at least partially, of the metabolic conditions. In this way, the data until the present moment do not permit to identify if the normalization of VO2 during the incremental exercise is more dependent on the time and/or the exercise intensity. Therefore, the aims of this study were: a) to analyze the influence of the previous supramaximum exercise on the VO2 kinetics during the rest-exercise transition carried out at 50 and 70% VO2max, and b) to analyze the influence of the previous supramaximum exercise on the cardiorespiratory and metabolic responses during the constant loading exercise performed at 50 and 70% VO2max... (Complete abstract, click eletronic address below)

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Aguiar, Rafael Alves de. "Desempenho e fadiga em sprints repetidos: a influência de características fisiológicas e perfil de treinamento". Universidade do Estado de Santa Catarina, 2013. http://tede.udesc.br/handle/handle/256.

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The aim of this study was to determine the mode and the level that the physiological and performance variables influence in repeated running sprint ability. To this end, the study used 27 males participants (10 sprint runners (VEL), 8 long-distance runners (FUN) and 9 active subjects (ATI)). In a synthetic track these subjects were submitted to following tests on different days: 1) Incremental testing for determination of VO2max and maximal aerobic velocity (MAV); 2) constant velocity test at 110%MAV for determination of on- and off transition kinetics of VO2 and accumulated deficit oxygen (AOD); 3; 1 minute all-out test for determination of blood lactate concentration ([lac]s) kinetics and off-transition kinetics of VO2; and 4) repeated sprint test (10 sprints of 35 m departing every 20 s) for determine the total time of sprints, best sprint and percentage decrement score (Sdec). In every tests the [lac]s and blood pH were analyzed for observe the difference between maximal value after exercise and rest value (i.e. ∆[lac]s e ∆pH).Total time was significant different between all groups (VEL, 49,5 ± 0,9 s; FUN, 52,6 ± 3,1 s; ATI, 55,9s ± 2,6 s) and Sdec was significant lower in long distance runners compared to other groups (VEL, 8,5 ± 2,5%; FUN, 4,0 ± 2,0%; ATI, 8,3 ± 4,1%). Total time was significant correlated with best sprint (r 0,86), AOD in T110 (r = -,061) and T1min (r = -0,60), ∆[lac]s (r = -0,64) and ∆pH (r = 0,59) in RS, primary time constant (tau1) (r = -0,45) e O2 consumed in fast component after exercise in T1min (r = -0,44). Differently, Sdec was significant correlated with aerobic variables (VO2max, r = -0,59; MAV, r = -0,55; tau1 during exercise, r = 0,41), tau1 after T110 (r = 0,59) and T1min (r = 0,47), as well as, with lactate exchange ability (r 0,75). Therefore, it was concluded that repeated sprint performance is strongly influenced by anaerobic characteristics, while mechanisms related to removal of metabolites originated by anaerobic metabolism and aerobic indices influence to decrease fatigue in RS.
O objetivo deste estudo foi determinar o modo e o grau que as variáveis fisiológicas e de desempenho influenciam no desempenho em sprints repetidos. Para este fim, participaram do estudo 27 homens, sendo 10 corredores velocistas (VEL), 8 corredores fundistas (FUN) e 9 sujeitos ativos (ATI). Em uma pista sintética de atletismo estes sujeitos foram submetidos, em dias diferentes, aos seguintes testes: 1) teste incremental para determinação do VO2max e da velocidade aeróbia máxima (MAV); 2) teste de velocidade constante realizado a 110%MAV (T110) para determinar a cinética do VO2 durante e após o exercício e o déficit de oxigênio (AOD); 3) teste de um minuto máximo (T1min), para determinar a cinética da concentração de lactato sanguíneo ([lac]s) e a cinética do VO2 após o exercício; e 4) teste de sprints repetidos (RS) (10 sprints de 35m, intercalados com 20s de recuperação) para determinar o tempo total dos sprints, melhor sprint e a queda do escore em percentual (Sdec). Em todos os testes a [lac]s e o pH sanguíneo foram analisados para observar a diferença entre o valor máximo após o exercício e o valor de repouso (i.e. ∆[lac]s e ∆pH). Tempo total em RS foi significativamente diferente entre todos os grupos (VEL, 49,5 ± 0,9 s; FUN, 52,6 ± 3,1 s; ATI, 55,9s ± 2,6 s) e Sdec foi significativamente inferior em fundistas comparado aos outros grupos (VEL, 8,5 ± 2,5%; FUN, 4,0 ± 2,0%; ATI, 8,3 ± 4,1%). Tempo total foi correlacionado significativamente com o melhor sprint (r = 0,86), com o AOD no T110 (r = -0,61) e no T1min (r = -0,60), com o ∆[lac]s (r = -0,64) e ∆pH (r = 0,59) do RS, com a constante de tempo primária (tau1) (r = -0,45) e O2 consumido pelo componente rápido após o exercício no T1min (r = -0,44). Diferentemente, o Sdec foi correlacionado significativamente com variáveis aeróbias (VO2max, r = -0,59; MAV, r = -0,55; tau1 durante T110, r = 0,41), tau1 após T110 (r = 0,59) e T1min (r = 0,47), bem como, com a constante de tempo da entrada do lactato no compartimento sanguíneo no T1min (r = -0,75). Portanto, foi concluído que o desempenho em sprints repetidos é altamente influenciado por características anaeróbias, enquanto, mecanismos relacionados à remoção dos metabólitos originados pelo metabolismo anaeróbio e índices aeróbios influenciam para diminuir a fadiga em RS.

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Machado, Carlos Eduardo Polazzo. "Efeitos do exercício prévio de intensidade supramáxima sobre a cinética do consumo de oxigênio em ciclistas treinados /". Rio Claro : [s.n.], 2005. http://hdl.handle.net/11449/87365.

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Orientador: Benedito Sérgio Denadai
Banca: Camila Coelho Greco
Banca: Marco Tulio de Mello
Resumo: O surgimento de equipamentos que permitem a análise do consumo de oxigênio (VO2) respiração-a- respiração, tem despertado um grande interesse nos fatores que podem influenciar sua cinética no início do exercício (resposta on). Entre os fatores mais estudados, temos a intensidade do exercício e o nível do treinamento dos sujeitos. Estes dados sugerem que a influência do exercício prévio sobre o VO2 durante o exercício incremental só ocorreria em baixas intensidades de esforço (< 60% VO2max). Os objetivos deste estudo foram: a) analisar a influência do exercício supramáximo realizado previamente, sobre os parâmetros da cinética do VO2 durante a transição repouso-exercício realizado a 50 e 70% VO2max, e b) analisar a influência do exercício supramáximo realizado previamente sobre as respostas cardiorrespiratórias e metabólicas durante o exercício de carga constante realizado a 50 e 70% VO2max. Para este estudo foram utilizados 14 ciclistas bem treinados do sexo masculino (VO2max = 63,4 + 6,5 ml.kg-1.min-1; idade = 21,4 + 3,5 anos; massa corporal = 68,1 + 6,8 kg; estatura = 174,9 + 4,6 cm) que executaram cinco testes: 1) exercício contínuo progressivo até a exaustão voluntária para a determinação do VO2max e as cargas correspondentes a 50, 70 e 120% VO2max e; 2) Quatro testes de carga constante, executados de forma aleatória e em dias separados. Nestes testes os sujeitos pedalaram durante 20 minutos em duas diferentes intensidades de exercício (50 e 70% do VO2max), realizados com e sem a execução prévia de um exercício supramáximo (120% VO2max). Foi analisada a resposta on do VO2 e também as respostas cardiorrespiratórias e metabólicas durante 20 minutos de exercício com carga constante realizados a 50 e 70% VO2max... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The appearance of an equipment that permits the oxygen consumption analysis (VO2) breath by breath has arisen a huge interest in factors which can influence its dynamics in the beginning of exercise (on response). Among the more studied factors, are the exercise intensity and training status. Meanwhile, few studies have analyzed the possible effects of previous exercise on the VO2response during exercise at moderate domain. In our lab, we have verified recently that during an incremental test performed eight minutes after a supramaximum exercise (120% VO2max), there was a significant VO2 increase in the first stage, while, at the intensities between 60% and VO2max, no alteration of VO2 was found, in accordance with the results existent in the literature. These results suggest that the influence of a previous exercise on the VO2 during the incremental exercise would just occur at low intensities (< 60% VO2 max). This model, meanwhile, does not permit to isolate a possible time effect of the exercise, once the highest intensities were always done after two or three stages, which could have favored a recovery, at least partially, of the metabolic conditions. In this way, the data until the present moment do not permit to identify if the normalization of VO2 during the incremental exercise is more dependent on the time and/or the exercise intensity. Therefore, the aims of this study were: a) to analyze the influence of the previous supramaximum exercise on the VO2 kinetics during the rest-exercise transition carried out at 50 and 70% VO2max, and b) to analyze the influence of the previous supramaximum exercise on the cardiorespiratory and metabolic responses during the constant loading exercise performed at 50 and 70% VO2max... (Complete abstract, click eletronic address below)
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Draper, Stephen B. "VO2 kinetics in severe intensity running". Thesis, University of Chichester, 2002. http://eprints.chi.ac.uk/799/.

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This thesis aimed to investigate and model the vo2, response to exhaustive constant intensity running of a short duration. Study I was a Douglas bag based study that compared the vo2, response of physically active subjects to 2, 5 and 8 minute bouts of constant intensity exhaustive exercise performed in both cycling and running. Nine male subjects took part and each completed a ramp test in addition to the three constant intensity tests in both modes of exercise. In the 5 and 8minute tests the subjects achieved 97.0 ± 4.2 and 97.5 ± 2.0 % for cycling, and 98.5 ± 1.8 and 99.2 ± 2.3% for running, of the ramp test Vo,peak. In the 2 minute test, a significantly lower percentage was attained (89.9 ± 5.5% and 91.8 ± 2.5% for cycling and running respectively). In cycling VO, was still increasing over the final minute of the test, whereas in running there was no difference between the last two 30 second samples (P~0.98). It was concluded that in severe intensity exercise of a short duration VO2 may not achieve its maximum and· that in running it may plateau at this sub-maximal rate. Study 2 validated the QP9000 for the measurement of vo2, during running on a breath-by-breath basis. Six male subjects performed a ramp test and tests at rest and at moderate and severe intensities. Each test was performed twice, once using the QP9000 and once using a Douglas bag system. No difference was found for VO, between the two systems (P~0.358). The SD of the differences between the systems across exercise intensities was 97 ± 57 ml.min·1 It was concluded that the QP9000 provides a valid measure of VO, at all exercises intensities. Study 3 investigated the vo2, response of trained runners to 800 m pace running, following a track based time trial. Eight male subjects (Vo,max 68.8 ± 5.6 m1.kg·'min-') took part in the study. That vo2, reached a plateau below Vo, was confirmed by a gradient of -29 ± 275 ml.min-' during the final 30 seconds of exercise. The asymptotic vo2, was only 85.3 ± 6.6 % of the Vo,peak from a ramp test and the response was shown to be extremely fast (time constant (T) of 10.7 ± 3.4 seconds). These breath-by-breath data confirmed the response indicated in Study I. Study 4 explored the single exponential model used to describe the vo2, response and the nature and level of breath-by-breath noise in severe intensity running. Five male subjects performed a ramp test to determine the speed at anaerobic threshold (AT). Each subject then performed five 8-minute runs at a speed corresponding to 90% of the AT and five exhaustive runs at a speed that would elicit exhaustion in about 2-minutes. Analysis of the noise to signal ratio of the severe intensity data showed that the noise was Gaussian and that averaging data over repeated transitions reduced this ratio. Computer simulations of noise equivalent to the noisiest subject's data demonstrated that the use of two repeated severe intensity transitions would give 95% confidence limits of < ± 1.2 seconds for T. Study 5 examined the effect of prior supra AT exercise on the VO, response to exhaustive severe intensity running. Ten middle and long distance runners each completed a ramp test to determine AT and Vo,peak. Subjects then ran exhaustive transitions, lasting approximately 2-minutes, that were preceded by moderate (90% AT) or heavy (50% of the difference between AT and Vo,peak) intensity running. Each transition was repeated. Increased metabolic acidosis (from prior heavy intensity exercise) did not increase the asymptotic vo2, (P ~ 0.226), and this figure represented only about 90% of Vo,peak from the ramp test. The mean response time (MRT) (time to reach 63% of the overall response) was faster following heavy exercise (20.9 ± 1.9 s vs. 18.9 ± 1.0 s, P<0.05). This was however due to a reduction in the duration of the initial (cardiodynamic) phase of the response rather than a speeding of the primary (phase 2) kinetics. Study 6 analysed the differences in this response between sprint and endurance runners. Six male athletes were recruited for each group based on best times for 100 m and 10 000 m. Subjects performed repeated transitions at a speed that would elicit exhaustion in approximately 2-minutes. No difference was found in the model of the VO, response between groups. When all subjects were analysed however a strong negative relationship was demonstrated between Vo,peak (from a ramp test) and the percentage of this Vo,peak that was reached in the constant speed test (r ~ -0.811, P ~ 0.001). It was concluded that the VO, response was dependent on the aerobic capabilities of the individual. In conclusion the thesis demonstrated a vo2, response in trained subjects during exhaustive severe intensity running that was different to that which is suggested by the majority of the literature. The vo2, response tends neither to VO, required nor to Vo,max, but rather tends to a plateau that is sub-maximal. This thesis was unable to identity the mechanisms that might result in such a shortfall in the response. However there appears to be a close link with the aerobic capabilities of the individual.

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Troll, Clemens. "Kinetische Berechnung von Rast-in-Rast-Bewegungen für Mechanismen". TUDpress, 2017. https://tud.qucosa.de/id/qucosa%3A30649.

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Gegenstand dieses Beitrags ist eine Methode zur kinetischen Berechnung antriebsentlastender Vorgaben für Rast-in-Rast-Bewegungen bei Mechanismen mit dem Laufgrad 1. Dabei werden die Vorteile der Vorgabe eines Antriebsmomentenprofils über dem Weg aufgezeigt und die numerischen Herausforderungen bei der Anwendung dieser Methode diskutiert. Anhand eines Praxisbeispiels wird diese Methode mit anderen aus dem Stand der Technik bekannten Verfahren verglichen und die entsprechenden Lösungen werden gegenübergestellt.
The subject of this paper is a method for the kinetic calculation of drive relieving rise to dwell motions for mechanisms with the degree of freedom of 1. The advantages of specifying a drive torque profile over the path2 are pointed out. Furthermore the numerical challenges in the application of this approach are discussed. By means of a practical example, both the new method as well as known methods and their corresponding solutions are compared.

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Williams, Christine Suzanne. "The Effect of Running Speed on VO2 Kinetics in the Severe Exercise Domain". Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc277817/.

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There has been an interest in the kinetics of the V02 response during exercise at various intensities. However, most studies focus on the response of submaximal intensities whereas few studies have examined V02 kinetics at severe intensities. The purpose of this study was to evaluate the effect of exercise intensity on V02 kinetics over a range of severe intensities.

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Libros sobre el tema "VO2 kinetic"

Basel, Museum Jean Tinguely, ed. Le Mouvement: Vom Kino zur Kinetik. Basel: Museum Tinguely, 2010.

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Buderer, Hans-Jürgen. Kinetische Kunst: Konzeptionen von Bewegung und Raum. Worms: Wernersche Verlagsgesellschaft, 1992.

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Und es bewegt sich doch--: Von Alexander Calder und Jean Tinguely bis zur zeitgenössischen "mobilen Kunst". Bochum: The Museum, 2006.

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Offenhauser, Friedrich. Modellierung von gepulsten Gasstromungslasern. Koln: DFVLR, 1987.

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Wolff, Stefan L. Die Rolle von Reibung und Wärmeleitung in der Entwicklung der kinetischen Gastheorie. [Berlin: S.L. Wolff, 1988.

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Weidermann, Frank. Strukturoptimierung von parallelkinematischen Werkzeugmaschinen. Zwickau: Wissenschaftliche Scripten, 2002.

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Busch, Hans Karl. Kinetik und Meditation: Fantastische Maschinen von Hans Karl Busch. Berlin: Galerie Horst Dietrich, 1986.

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Germany) Leopoldina-Meeting (1999 Halle an der Saale. Festkörperreaktionen--Transport, Mechanismen und die Rolle von Phasengrenzen: Zum 80. Geburtstag von Alterspräsident Heinz Bethge : Leopoldina-Meeting vom 19. bis 20. November 1999 in Halle (Saale). Halle (Saale): Deutsche Akademie der Naturforscher Leopoldina, 2000.

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Huene, Stephan von. Stephan von Huene: Lexichaos : vom Verstehen des Missverstehens zum Missverstehen des Verständlichen : eine Klanginstallation im Kuppelsaal der Hamburger Kunsthalle vom 8. Juni bis 8. Juli 1990. [Hamburg]: Hamburger Kunsthalle, 1990.

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Werner, Haas. Cage Effekte in homogener und mizellarer Lösung: Eine Anwendung der Magnetokinetik von Triplettexciplexen und Radikalpaaren. Konstanz: Hartung-Gorre, 1991.

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Capítulos de libros sobre el tema "VO2 kinetic"

Uhrig, Richard. "Das Eigenverhalten von Flächentragwerken". En Kinetik der Tragwerke, 300–342. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-95820-5_11.

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Weber, W. "Nichtlineare Kinetik von Thiamin". En Pharmakologie und klinische Anwendung hochdosierter B-Vitamine, 11–20. Heidelberg: Steinkopff, 1991. http://dx.doi.org/10.1007/978-3-642-85410-1_2.

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Lynch, Gordon S., David G. Harrison, Hanjoong Jo, Charles Searles, Philippe Connes, Christopher E. Kline, C. Castagna et al. "Slow Component of VO2 on-kinetics". En Encyclopedia of Exercise Medicine in Health and Disease, 794–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-540-29807-6_3045.

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Dressler, Irina, Svetlana Dressler y M. L. Dressler. "Kinetic Visual Acuity and Alcohol Ingestion". En Acta Medicinæ Legalis Vol. XLIV 1994, 359–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79523-7_117.

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Gross, Dietmar, Werner Hauger, Jörg Schröder y Wolfgang A. Wall. "Kinetik eines Systems von Massenpunkten". En Springer-Lehrbuch, 81–118. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-53954-1_2.

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Wagener, H. H., U. Vögtle-Junkert y G. Berner. "Zur perkutanen Kinetik von Ibuprofen". En Dermatologie und Rheuma, 530–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72668-2_57.

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Gross, Dietmar, Werner Hauger, Walter Schnell, Jörg Schröder y Wolfgang A. Wall. "Kinetik eines Systems von Massenpunkten". En Springer-Lehrbuch, 81–117. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11264-5_3.

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Knälmann, H., A. Anders y H. Tronnier. "Laser-induzierte Kinetik von Hautreaktionen". En Laser in der Medizin / Laser in Medicine, 377–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-50234-7_95.

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Keßler, C. "Galenik und Kinetik von Glaukomtherapeutika". En Das Glaukom, 216–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84853-7_17.

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Kohn, Alexander. "Kinetik der Inaktivierung von Glasgeräten". En Der Einfluß von Erdnußbutter auf die Erdrotation — Forschungen, die die Welt nicht braucht, 35–40. Basel: Birkhäuser Basel, 1999. http://dx.doi.org/10.1007/978-3-0348-6244-8_5.

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Actas de conferencias sobre el tema "VO2 kinetic"

Dagaut, Philippe, Guillaume Dayma, Florent Karsenty y Zeynep Serinyel. "The Combustion of Synthetic Jet Fuels (Gas to Liquid and Coal to Liquid) and Multi-Component Surrogates: Experimental and Modeling Study". En ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42004.

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Research on synthetic jet fuels production and combustion has recently gained importance because they could help addressing security of supply and sustainable air transportation challenges. The combustion of a 100% Gas to Liquid from Shell (C10.45H23.06; M=148.44 g.mol−1; H/C=2.20; density=737.7 g L−1), a 100% vol. Coal to Liquid from Sasol (C11.06H21.6; M=154.32 g mol−1; H/C=1.95; density= 815.7 g L−1) and surrogates composed of various concentrations of n-decane iso-octane, n-propylcyclohexane, n-propylbenzene, and decalin, were studied in a jet-stirred reactor under the same conditions (temperature, 550–1150 K; pressure, 10 bar; equivalence ratio, 0.5–2). Comparison of these results helped designing optimum surrogate model fuels for the chemical kinetic computations. For simulating the kinetics of oxidation of the synthetic fuels we used new surrogates consisting of mixtures of n-decane, iso-octane, 2-methylheptane, 3-methylheptane, decalin, n-propylcyclohexane, n-propylbenzene, and tetralin. The detailed chemical kinetic reaction mechanism proposed here consisted of 2430 species reacting in 10962 reversible reactions. It was validated using the entire experimental database obtained previously in our laboratory and in the present work. The current chemical kinetic model was also tested for the auto-ignition under shock tubes using data from the literature. Kinetic computations involving reaction paths analyses and sensitivity analyses were used to interpret the results.

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Dagaut, Philippe y Pascal Diévart. "Experimental and Modeling Study of the Combustion of Synthetic Jet Fuels: Naphtenic Cut and Blend With a GtL Jet Fuel". En ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56086.

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Research on the production and combustion of synthetic jet fuels has recently gained importance because of their potential for addressing security of supply and sustainable air transportation challenges. The combustion of a 100% naphtenic cut that fits with typical chemical composition of products coming from biomass or coal liquefaction (C12.64H23.64; M=175.32 g.mol−1; H/C=1.87; DCN=39; density=863.1 g.L−1) and a 50% vol. mixture with Gas to Liquid from Shell (mixture: C11.54H23.35; M=161.83 g.mol−1; H/C=2.02; DCN=46; density=800.3 g.L−1) were studied in a jetstirred reactor under the same conditions (temperature, 550–1150 K; pressure, 10 bar; equivalence ratio, 0.5, 1, and 2; initial fuel concentration, 1000 ppm). Surrogate model-fuels were designed based on fuel composition and properties for simulating the kinetics of oxidation of these fuels. We used new model-fuels consisting of mixtures of n-decane, decalin, tetralin, 2-methylheptane, 3-methylheptane, n-propyl cyclohexane, and n-propylbenzene. The detailed chemical kinetic reaction mechanism proposed was validated using the entire experimental database obtained in the present work and for the oxidation of pure GtL, we used previous results. Kinetic computations involving reaction paths analyses and sensitivity analyses were used to interpret the results.

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Buekers, Joren, Patrick De Boever, Alberto Peña Fernández, Jan Theunis, Emiel Wouters, Martijn Spruit y Jean-Marie Aerts. "Box-Jenkins transfer function modelling for accurate determination of VO2 kinetics in COPD patients". En ERS International Congress 2019 abstracts. European Respiratory Society, 2019. http://dx.doi.org/10.1183/13993003.congress-2019.pa4134.

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Gupta, P., V. L. Colvin, J. L. Brand y S. M. George. "Desorption kinetics of hydrogen from silicon surfaces using transmission FTIR". En AIP Conference Proceedings Vol. 167. AIP, 1988. http://dx.doi.org/10.1063/1.37144.

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Supriyanto, Edy, Anis Istiqomah, Ro'sil Qohhar, Endhah Purwandari, Henry Ayu Kartikasari, Agus Subekti y Agus Geter Edy Sutjipto. "Simulation of the iodide/triiodide electrolyte concentration’s effects on Jsc and Voc for dye-sensitized solar cells (DSSC)". En THE PHYSICS OF SURFACES: Aspects of the Kinetics and Dynamics of Surface Reaction. AIP, 2023. http://dx.doi.org/10.1063/5.0117686.

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Mzé-Ahmed, Amir, Philippe Dagaut, Guillaume Dayma y Pascal Diévart. "Kinetics of Oxidation of a 100% Gas-to-Liquid Synthetic Jet Fuel and a Mixture GTL/1-Hexanol in a Jet-Stirred Reactor: Experimental and Modeling Study". En ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25077.

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Research activities on the combustion of synthetic jet fuels and bio-derived jet fuels have increased notably over the last 10 years in order to solve the challenging reduction of dependence of air transportation on petroleum. Within the European Community’s Seventh Framework Programme, the combustion of a 100% GtL from Shell and a 80/20% vol. GtL/1-hexanol blend were studied in a jet-stirred reactor (JSR). This synthetic GtL fuel mainly contains n-alkanes, iso-alkanes, and cyclo-alkanes. We studied the oxidation of these alternatives jet fuels under the same conditions (temperature, 550–1150 K; pressure, 10 bar; equivalence ratio, 0.5–2; initial fuel concentration, 1000 ppm). For simulating the oxidation kinetics of these fuels we used a new surrogate mixture consisting of n-dodecane, 3-methylheptane, n-propylcyclohexane, and 1-hexanol. A detailed chemical kinetic reaction mechanism was developed and validated by comparison with the experimental results obtained in a jet-stirred reactor. The current model was also tested for the autoignition of the GtL fuel under shock tubes conditions (φ = 1 and P = 20 atm) using data from the literature. Kinetic computations involving reaction paths analyses and sensitivity analyses were used to interpret the results. The general findings are that the GTL and GTL/hexanol blend have very similar reactivity to Jet A-1, which is important since GTL is a drop-in fuel that should have similar performance to the Jet A-1 baseline and 1-hexanol should not significantly affect the reactivity if it is to be used as an additive.

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Ashrafi, Nariman, Mohammad Reza Ansari, Armin Chegini y Ali Sadeghi. "The Investigation of the Kinetic Energy of Slug in a Horizontal Channel Using VOF Method". En ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87108.

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In this article, two-phase slug regime in a duct with rectangular cross-section is investigated numerically, using the volume of fluid (VOF) method. Equations of mass, momentum and advection of volume fraction are solved accompanying k-∈ realizable turbulence equations. To ensure the creditability, numerical results have been compared with experimental results using same geometry. With occurrence of instability in the entrance of duct, Kelvin-Helmholtz condition satisfies and with increasing instability, slug phenomenon occurs. With closing the cross-section of duct, slug causes pressure gradient in it. Trapped air behind a slug transfers the momentum and increases the kinetic energy of slug. In this research the kinetic energy of a slug is investigated.

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Shin, S., C. Lee, K. T. Han y H. J. Kim. "Effect of Process Parameters on the Deposition Characteristics of a Bronze-20 vol.% Diamond Composite in Kinetic Spraying". En ITSC2007, editado por B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima y G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0123.

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Abstract The aim of this study was to ascertain the optimal process parameters that minimized compositional variation between the original powder mixture and composite coating. A bronze- 20 vol.% diamond composite powder was deposited by a kinetic spraying process with various feed rates, spraying distances and particle velocities. Experimental results showed that the diamond fraction, deposition efficiency and bond strength were dependent on process parameters, in particular, the particle velocity.

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van Breugel, Hans H. F. I., Philip G. de Groot y Jan J. Sixma. "KINETIC BEHAVIOUR OF VON WILLEBRAND FACTOR AND FIBRONECTIN EXPLAINS DEPENDENCE OF PLATELET ADHESION ON PHYSICAL PARAMETERS". En XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643632.

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To study the kinetics of the contribution of von Willebrand Factor (vWF) and fibronectin (FN) in platelet adhesion we developed a method with which we can perform binding studies of platelets to these purified proteins under static and flow conditions. Glass coverslips were incubated for one hour with vWF (50 (jg/ml) or FN (300 pg/ml) in saline and were perfused with washed platelets (resuspended in human albumin solution) in the flat perfusion chamber as developed by Sakariassen (J.Lab.Clin.Med. 102, 522-535, 1983). Static conditions were achieved by incubating the coated coverslips with the platelet suspension.In this system, adhesion of platelets to FN coated coverslips strongly decreased at shear rates above 300 /s. The adhesion to this surface could be inhibited with antibodies against platelet glycoprotein Ilbllla and against lb, under static and under flow conditions.Adhesion to vWF coated surfaces increased with increasing shear rate and ultimately reached a plateau at about 800 /s. Adhesion to a vWF coated surface could be totally inhibited by anti GP-Ib and only partially by GP-IIbllla.When after perfusion of a FN coated surface with platelets, the same surface was perfused with a platelet free perfusate, the coverage of platelets on this surface decreased. No decrease in platelet coverage was found when this experiment was performed with a vWF coated coverslip.From these results we conclude that platelets bind to FN at a high rate and with a low affinity, while they bind slowly but with a high affinity to vWF, probablyvia similar platelet receptors.

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Gokulakrishnan, P., M. S. Klassen y R. J. Roby. "Ignition Characteristics of a Fischer-Tropsch Synthetic Jet Fuel". En ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51211.

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Ignition delay times of a “real” synthetic jet fuel (S8) were measured using an atmospheric pressure flow reactor facility. Experiments were performed between 900 K and 1200 K at equivalence ratios from 0.5 to 1.5. Ignition delay time measurements were also performed with JP8 fuel for comparison. Liquid fuel was prevaporized to gaseous form in a preheated nitrogen environment before mixing with air in the premixing section, located at the entrance to the test section of the flow reactor. The experimental data show shorter ignition delay times for S8 fuel than for JP8 due to the absence of aromatic components in S8 fuel. However, the ignition delay time measurements indicate higher overall activation energy for S8 fuel than for JP8. A detailed surrogate kinetic model for S8 was developed by validating against the ignition delay times obtained in the present work. The chemical composition of S8 used in the experiments consisted of 99.7 vol% paraffins of which approximately 80 vol% was iso-paraffins and 20% n-paraffins. The detailed kinetic mechanism developed in the current work included n-decane and iso-octane as the surrogate components to model ignition characteristics of synthetic jet fuels. The detailed surrogate kinetic model has approximately 700 species and 2000 reactions. This kinetic mechanism represents a five-component surrogate mixture to model generic kerosene-type jets fuels, namely, n-decane (for n-paraffins), iso-octane (for iso-paraffins), n-propylcyclohexane (for naphthenes), n-propylbenzene (for aromatics) and decene (for olefins). The sensitivity of iso-paraffins on jet fuel ignition delay times was investigated using the detailed kinetic model. The amount of iso-paraffins present in the jet fuel has little effect on the ignition delay times in the high temperature oxidation regime. However, the presence of iso-paraffins in synthetic jet fuels can increase the ignition delay times by two orders of magnitude in the negative temperature (NTC) region between 700 K and 900 K, typical gas turbine conditions. This feature can have a favorable impact on preventing flashback caused by the premature autoignition of liquid fuels in lean premixed prevaporized (LPP) combustion systems.

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