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Journal articles on the topic 'Oxygen kinetics'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 March 2023

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1

Galotto, M. J., S. A. Anfossi, and A. Guarda. "Oxygen Absorption Kinetics of Sheets and Films Containing a Commercial Iron-based Oxygen Scavenger." Food Science and Technology International 15, no. 2 (April 2009): 159–68. http://dx.doi.org/10.1177/1082013208106207.

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Absorption kinetics of three different forms of the same iron-based oxygen scavenger were studied. Oxygen scavengers were used as pellet, sheet, and film materials. Two scavenger concentrations were used for sheet and film forms. Scavenger samples were analyzed at 75 or 100% relative humidities and stored at 5, 15, and 25°C. Oxygen concentration in the headspace was measured as a function of time. Absorption kinetics was best described by the Chapman-Richards empirical growth model rather than by a first-order reaction. Arrhenius behavior was observed for variations in the final absorption rate with temperature. Absorption capacities, final absorption rates, and activation energies were evaluated and discussed. Scavenger concentration, relative humidity, and temperature effects on kinetic parameters were studied for each experimental condition. Temperature was the most important factor that affected kinetic parameters. At the relative humidity levels studied, any important effect on kinetic parameters was not observed, except on absorption capacities.

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2

Manns, P. J., C. R. Tomczak, and R. G. Haennel. "OXYGEN UPTAKE KINETICS." Journal of Cardiopulmonary Rehabilitation and Prevention 29, no. 5 (September 2009): 333. http://dx.doi.org/10.1097/01.hcr.0000361192.80278.bb.

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3

Lyman, John L., and Redus Holland. "Oxygen fluoride chemical kinetics." Journal of Physical Chemistry 92, no. 26 (December 1988): 7232–41. http://dx.doi.org/10.1021/j100337a015.

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4

Faiia, A., and X. Feng. "Zeolite oxygen exchange kinetics." Chinese Science Bulletin 43, S1 (August 1998): 38. http://dx.doi.org/10.1007/bf02891422.

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5

de Jesus, Kelly, Ana Sousa, Karla de Jesus, João Ribeiro, Leandro Machado, Ferran Rodríguez, Kari Keskinen, João Paulo Vilas-Boas, and Ricardo J. Fernandes. "The effects of intensity on V̇O2 kinetics during incremental free swimming." Applied Physiology, Nutrition, and Metabolism 40, no. 9 (September 2015): 918–23. http://dx.doi.org/10.1139/apnm-2015-0029.

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Swimming and training are carried out with wide variability in distances and intensities. However, oxygen uptake kinetics for the intensities seen in swimming has not been reported. The purpose of this study was to assess and compare the oxygen uptake kinetics throughout low-moderate to severe intensities during incremental swimming exercise. We hypothesized that the oxygen uptake kinetic parameters would be affected by swimming intensity. Twenty male trained swimmers completed an incremental protocol of seven 200-m crawl swims to exhaustion (0.05 m·s−1 increments and 30-s intervals). Oxygen uptake was continuously measured by a portable gas analyzer connected to a respiratory snorkel and valve system. Oxygen uptake kinetics was assessed using a double exponential regression model that yielded both fast and slow components of the response of oxygen uptake to exercise. From low-moderate to severe swimming intensities changes occurred for the first and second oxygen uptake amplitudes (P ≤ 0.04), time constants (P = 0.01), and time delays (P ≤ 0.02). At the heavy and severe intensities, a notable oxygen uptake slow component (>255 mL·min−1) occurred in all swimmers. Oxygen uptake kinetics whilst swimming at different intensities offers relevant information regarding cardiorespiratory and metabolic stress that might be useful for appropriate performance diagnosis and training prescription.

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6

Zhang, Yong-Feng, Xiang-Yun Chen, Qian-Cheng Zhang, Chun-Ping Li, and Quan Zhou. "Oxygen-enriched combustion of lignite." Thermal Science 19, no. 4 (2015): 1389–92. http://dx.doi.org/10.2298/tsci1504389z.

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The study is concerned on the oxygen-enriched combustion kinetics of lignite. Thermogravimetric experiments were carried out in a thermogravimetric analyzer under O2/N2 conditions, and operated at different heating rates ranging from 5?C per minute to 25?C per minute. Flynn-Wall-Ozawa method was used to calculate the kinetic parameter. The value of activation energy increased when the oxygen concentration varied from 21% to 70%.

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7

Koschate, Jessica, Uwe Drescher, Christian Brinkmann, Klaus Baum, Thorsten Schiffer, Joachim Latsch, Klara Brixius, and Uwe Hoffmann. "Faster heart rate and muscular oxygen uptake kinetics in type 2 diabetes patients following endurance training." Applied Physiology, Nutrition, and Metabolism 41, no. 11 (November 2016): 1146–54. http://dx.doi.org/10.1139/apnm-2016-0001.

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Cardiorespiratory kinetics were analyzed in type 2 diabetes patients before and after a 12-week endurance exercise-training intervention. It was hypothesized that muscular oxygen uptake and heart rate (HR) kinetics would be faster after the training intervention and that this would be detectable using a standardized work rate protocol with pseudo-random binary sequences. The cardiorespiratory kinetics of 13 male sedentary, middle-aged, overweight type 2 diabetes patients (age, 60 ± 8 years; body mass index, 33 ± 4 kg·m−2) were tested before and after the 12-week exercise intervention. Subjects performed endurance training 3 times a week on nonconsecutive days. Pseudo-random binary sequences exercise protocols in combination with time series analysis were used to estimate kinetics. Greater maxima in cross-correlation functions (CCFmax) represent faster kinetics of the respective parameter. CCFmax of muscular oxygen uptake (pre-training: 0.31 ± 0.03; post-training: 0.37 ± 0.1, P = 0.024) and CCFmax of HR (pre-training: 0.25 ± 0.04; post-training: 0.29 ± 0.06, P = 0.007) as well as peak oxygen uptake (pre-training: 24.4 ± 4.7 mL·kg−1·min−1; post-training: 29.3 ± 6.5 mL·kg−1·min−1, P = 0.004) increased significantly over the course of the exercise intervention. In conclusion, kinetic responses to changing work rates in the moderate-intensity range are similar to metabolic demands occurring in everyday habitual activities. Moderate endurance training accelerated the kinetic responses of HR and muscular oxygen uptake. Furthermore, the applicability of the used method to detect these accelerations was demonstrated.

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8

Trofè, Aurelio, Milena Raffi, David Muehsam, Andrea Meoni, Francesco Campa, Stefania Toselli, and Alessandro Piras. "Effect of PEMF on Muscle Oxygenation during Cycling: A Single-Blind Controlled Pilot Study." Applied Sciences 11, no. 8 (April 17, 2021): 3624. http://dx.doi.org/10.3390/app11083624.

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Pulsed electromagnetic fields (PEMFs) are used as non-invasive tools to enhance microcirculation and tissue oxygenation, with a modulatory influence on the microvasculature. This study aimed to measure the acute effect of PEMF on muscle oxygenation and its influence on pulmonary oxygen kinetics during exercise. Eighteen male cyclists performed, on different days, a constant-load exercise in both active (ON) and inactive (OFF) PEMF stimulations while deoxyhemoglobin and pulmonary oxygen kinetics, total oxygenation index, and blood lactate were collected. PEMF enhanced muscle oxygenation, with higher values of deoxyhemoglobin both at the primary component and at the steady-state level. Moreover, PEMF accelerated deoxyhemoglobin on-transition kinetic, with a shorter time delay, time constant, and mean response time than the OFF condition. Lactate concentration was higher during stimulation. No differences were found for total oxygenation index and pulmonary oxygen kinetics. Local application of a precise PEMF stimulation can increase the rate of the muscle O2 extraction and utilization. These changes were not accompanied by faster oxygen kinetics, reduced oxygen slow component, or reduced blood lactate level. It seems that oxygen consumption is more influenced by exercise involving large muscle mass like cycling, whereas PEMF might only act at the local level.

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9

Khanh, Le Quoc. "A STUDY ON THE KINETICS OF OXYGEN REDUCTION FOCOAR." Vietnam Journal of Science and Technology 55, no. 5B (March 24, 2018): 111. http://dx.doi.org/10.15625/2525-2518/55/5b/12216.

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In poor oxygenated environments the oxidation and growth of the living organisms are slowed or stopped, so that food is better preserved. The most appropriate method for oxygen depletion in the air-tight minienvironment is oxygen reduction with iron-based reducing agent, which can reduce the air oxygen concentration to about 0 %, and maintain this low oxygen concentration long during storage. This paper studies the kinetics of oxygen reduction by reducing agent FOCOAR in an airtight minienvironment under isobaric conditions. The kinetics of the reduction process calculated according to the relation vav = [21 % - (end) ] / tend, in which vav is average reduction rate, (end) is oxygen concentration at the end of the experiment, tend is total time needed for the oxygen reduction experiment. Instantaneous reduction rate vred was calculated according to equation vred = ∆/△t, in which ∆is oxygen concentration reduced in time △t, and △t = ti+1 - ti is time interval for oxygen reduction. It is found that vav depends on the quantity of reducing agent FOCOAR, and in certain time interval varies as linear function of reduction time, corresponding to constant vred. The kinetic result allows an estimating the amount of the reducing agent FOCOAR needed for a preserve minienvironment.

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10

Kutlugil’dina, Galiya G. "Kinetic scheme of apple pectin oxidative transformations under the action of the ozone-oxygen mixture." Butlerov Communications 61, no. 2 (February 29, 2020): 79–89. http://dx.doi.org/10.37952/roi-jbc-01/20-61-2-79.

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Mathematical modeling of apple pectin oxidative transformations (AP) under the action of the ozone-oxygen mixture in aqueous solutions (the reaction system "AP + O3 + O2 + H2O") has been carried out. The kinetic scheme of the oxidation process was compiled basing on the well-known ideas of liquid-phase oxidation mechanisms of organic compounds (taking into account the currently known experimental results on AP oxidation). Using the "KhimKinOptima" software package for the proposed scheme, the inverse and direct chemical kinetics problems were solved. The well-known literature data on the rate constants of elementary stages were used. The rate constants of the oxidation key stages have been determined after solving the chemical kinetics inverse problem with the index method of the observed and calculated kinetic data global optimization. It turned out that the rate constants of the individual stages obtained by calculation are in good agreement with the values of the rate constants taken from literary sources. The chemical kinetics direct problem has been solved with the found rate constants and allowed obtaining kinetic curves of all participants in the apple pectin ozonized oxidation. It was found that the kinetic curve of the accumulation of carboxyl groups, obtained experimentally, completely coincided with the theoretical dependence. It has been also shown that the proposed apple pectin oxidative conversion scheme in the "AP + O3 + O2 + H2O" reaction system allows one to explain all the currently available experimental results. The apple pectin ozonized oxidation under another initiator (Н2О2 + FeSO4) has been studied to confirm the kinetic scheme. To do this, 3 new stages has been introduced into the scheme proposed, characterizing the catalytic decomposition of hydrogen peroxide under a transition metal (Fe2+). By solving the chemical kinetics direct problem, the accumulation kinetic curves of the final reaction products were obtained. It has been found that the carboxyl groups accumulation kinetics in the reaction system "AP + O3 + O2 + H2O2 + FeSO4 + H2O" after the supplementary experiment coincided with the theoretical kinetic curve. Thereby, the accuracy of the apple pectin proposed oxidative conversion scheme is confirmed.

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11

Xu, Fan, and Edward C. Rhodes. "Oxygen Uptake Kinetics During Exercise." Sports Medicine 27, no. 5 (1999): 313–27. http://dx.doi.org/10.2165/00007256-199927050-00003.

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12

Paterson, D. H., J. G. Pickering, D. A. Cunningham, W. J. Kostuk, and D. R. Boughner. "OXYGEN KINETICS IN CARDIAC TRANSPLANTS." Medicine and Science in Sports and Exercise 21, Supplement (April 1989): S13. http://dx.doi.org/10.1249/00005768-198904001-00074.

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13

Patterson, D. H., J. G. Pickering, D. A. Cunningham, W. J. Kostuk, and D. R. Boughner. "Oxygen Kinetics in Cardiac Transplants." Journal of Cardiopulmonary Rehabilitation 9, no. 9 (September 1989): 368. http://dx.doi.org/10.1097/00008483-198909000-00005.

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14

&NA;. "Free Communication/Slide - Oxygen Kinetics." Medicine & Science in Sports & Exercise 40, Supplement (May 2008): 72. http://dx.doi.org/10.1249/01.mss.0000321431.04829.9c.

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15

Maier, J. "Kinetics of oxygen stoichiometry changes." Solid State Ionics 129, no. 1-4 (April 2000): 25–32. http://dx.doi.org/10.1016/s0167-2738(99)00314-8.

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16

Fan, Z. G., Y. X. Zhuang, G. Yang, R. Shao, and G. F. Zhang. "Oxygen absorption kinetics in YBa2Cu3Ox." Journal of Alloys and Compounds 200, no. 1-2 (October 1993): 33–36. http://dx.doi.org/10.1016/0925-8388(93)90467-2.

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17

Wilson, Charles A., Bruce A. Berkowitz, and Diane L. Hatchell. "Oxygen kinetics in preretinal perfluorotributylamine." Experimental Eye Research 55, no. 1 (July 1992): 119–26. http://dx.doi.org/10.1016/0014-4835(92)90099-e.

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18

Tewari, Gaurav, Digvir S. Jayas, Lester E. Jeremiah, and Richard A. Holley. "Absorption kinetics of oxygen scavengers." International Journal of Food Science and Technology 37, no. 2 (February 2002): 209–17. http://dx.doi.org/10.1046/j.1365-2621.2002.00558.x.

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19

Hsu, C. L., and J. S. Hsieh. "Reaction kinetics in oxygen bleaching." AIChE Journal 34, no. 1 (January 1988): 116–22. http://dx.doi.org/10.1002/aic.690340113.

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20

Juliastuti, S. R., J. Baeyens, C. Creemers, and J. Degreve. "Determination of rate parameter for kinetics of nitrification." Jurnal Teknik Kimia Indonesia 4, no. 2 (October 2, 2018): 234. http://dx.doi.org/10.5614/jtki.2005.4.2.7.

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Determination of rate parameter for kinetics of nitrification The nitrification process is the bottleneck step in the total nitrogen removal. The formation of nitrate is considered as the rate limiting step in the whole process and its kinetics determine the design of the nitrification reactor. Heavy metals (Zn2+ and Cu2+) and different organic compounds are used as micropollutants. These kinetics were experimentally measured by respirometry. In line with the aim of the paper, the experimental investigation are conducted to develop design equations to describe kinetic rate relationships under optimum conditions, study the parameter influence such as pH and inhibition by reaction intermediates and inhibition by external pollutants. Results demonstrate that the maximum value of the specific growth rate of autotrophic biomass() is 1.02 day at pH=7 and decreases at pH 7.5; inhibition occurs at substrate (NH4) concentrations in excess of 15 mg N/l; inhibition occurs at increasing concentrations of NO –N and Cu2+ has more pronounced inhibitory effect than Zn2+. The inhibitory effect of organic compounds are listed as the Chlorobenzene > Trichloroethylene> Phenol> Ethyl benzene; the experimental oxygen uptake rate (OUR)-test results the autotrophic kinetic parameter values, which can be used in design equations. Keywords: Respirometry, Autotrophic Biomass, Nitrification, Oxygen Uptake Rate Abstrak Proses nitrifikasi merupakan langkah penting pada penurunan kadar total nitrogen. Pembentukan nitrat dianggap sebagai tahap pembatas kecepatan reaksi pada keseluruhan proses dan kinetikanya menentukan perancangan dari bagian proses nitrifikasi. Logam berat (Zn2+ dan Cu2+) dan berbagai jenis komponen organik digunakan sebagai mikropolutan. Kinetika ini secara eksperimental diukur menggunakan respirometer. Tujuan penelitian adalah mengembangkan persamaan perancangan yang menggambarkan hubungan laju kinetika pada kondisi optimum, studi pengaruh parameter seperti pH, inhibisi karena reaksi intermediat, dan inhibisi oleh polutan dari luar. Hasil penelitian ditunjukkan sebagai berikut: harga laju pertumbuhan biomasa autotrof maksimum spesifik adalah 1,02 hari-1 pada pH=7 dan menurun pada pH 7,5; inhibisi terjadi pada konsentrasi substrat (NH4+) lebih besar dari 15 mg N/l; inhibisi terjadi pada peningkatan konsentrasi NO -N ;Cu2+ lebih dikenal sebagai penyebab inhibisi daripada Zn2+. Efek inhibisi dari komponen organik di daftar mulai dari Chlorobenzene sampai Ethylbenzen. Tes OUR menghasilkan harga parameter kinetika yang dapat dipakai pad apersamaan perencanaan lumpur aktif nitrifikasi. Kata Kunci: Respirometer, BiomasaAutotrof, Nitrifikasi, Laju Kenaikan Oksigen

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21

Hamo, Eliran, Avichay Raviv, and Brian A. Rosen. "Influence of Nanocrystalline Palladium Morphology on Alkaline Oxygen Reduction Kinetics." Catalysts 9, no. 7 (June 26, 2019): 566. http://dx.doi.org/10.3390/catal9070566.

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The structure sensitivity of the alkaline oxygen reduction reaction (ORR) on palladium is of great interest as cost considerations drive the need to find a replacement for platinum catalysts. The kinetics of alkaline ORR were investigated on nanocrystalline palladium (Pd) films with domain sizes between 14 and 30 nm that were synthesized by electrodeposition from aqueous electrolytes. Ten Pd films were prepared under varying electrodeposition parameters leading to each having a unique texture and morphology. The sensitivity of initial alkaline ORR kinetics to the Pd surface structure was evaluated by measuring the kinetic current density and number of electrons transferred for each film. We show through scanning electron microscopy (SEM), x-ray diffraction (XRD), atomic force microscopy (AFM), and voltammetry from rotating disc electrodes (RDEs) that the fastest alkaline ORR kinetics are found on Pd surfaces with high surface roughness, which themselves are composed of fine grains. Such a study is useful for developing membrane electrode assemblies (MEAs) based on directly electrodepositing catalyst onto a conductive diffusion layer.

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22

Kendall, S. C., T. Moritani, G. H. Hartung, and C. Pratt. "MAXIMAL OXYGEN UPTAKE AND OXYGEN KINETICS IN CARDIAC PATIENTS." Medicine & Science in Sports & Exercise 18, supplement (April 1986): S61. http://dx.doi.org/10.1249/00005768-198604001-00303.

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23

Miloš, Vojtěch, Petr Vágner, Daniel Budáč, Michal Carda, Martin Paidar, Jürgen Fuhrmann, and Karel Bouzek. "Generalized Poisson-Nernst-Planck-Based Physical Model of the O₂∣LSM∣YSZ Electrode." Journal of The Electrochemical Society 169, no. 4 (April 1, 2022): 044505. http://dx.doi.org/10.1149/1945-7111/ac4a51.

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The paper presents a generalized Poisson-Nernst-Planck model of an yttria-stabilized zirconia electrolyte developed from first principles of nonequilibrium thermodynamics which allows for spatial resolution of the space charge layer. It takes into account limitations in oxide ion concentrations due to the limited availability of oxygen vacancies. The electrolyte model is coupled with a reaction kinetic model describing the triple phase boundary with electron conducting lanthanum strontium manganite and gaseous phase oxygen. By comparing the outcome of numerical simulations based on different formulations of the kinetic Eqs. with the results of EIS and CV measurements we attempt to discern the existence of separate surface lattice sites for oxygen adatoms and surface oxides from the assumption of shared ones. Moreover, we show that the mass-action kinetics model is sensitive to oxygen partial pressure unlike exponential kinetics models. The resulting model is fitted to a dataset of EIS and CVs spanning multiple temperatures and pressures, using various relative weights of EIS and CV data in the fitness function. The model successfully describes the physics of the interface around the OCV.

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24

Drescher, Uwe. "Impact of venous return on pulmonary oxygen uptake kinetics during dynamic exercise: in silico time series analyses from muscles to lungs." Journal of Applied Physiology 125, no. 4 (October 1, 2018): 1150–64. http://dx.doi.org/10.1152/japplphysiol.01058.2017.

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The aim of the present study was to investigate whether a single-compartment (SCM) and a multi-compartment (MCM) venous return model will produce significantly different time-delaying and distortive effects on pulmonary oxygen uptake (V̇o2pulm) responses with equal cardiac outputs (Q̇) and muscle oxygen uptake (V̇o2musc) inputs. For each model, 64 data sets were simulated with alternating Q̇ and V̇o2musc kinetics—time constants (τ) ranging from 10 to 80 s—as responses to pseudorandom binary sequence work rate (WR) changes. Kinetic analyses were performed by using cross-correlation functions (CCFs) between WR with V̇o2pulm and V̇o2musc. Higher maxima of the CCF courses indicate faster system responses—equal to smaller τ values of the variables of interest (e.g., τV̇o2musc). The models demonstrated a highly significant relationship for the resulting V̇o2pulm responses ( r = 0.976, P < 0.001, n = 64). Both models showed significant differences between V̇o2pulm and V̇o2musc kinetics for τV̇o2musc ranging from 10 to 30 s ( P < 0.05 each). In addition, a significant difference in V̇o2pulm kinetics ( P < 0.05) between the models was observed for very fast V̇o2musc kinetics (τ = 10 s). The combinations of fast Q̇ dynamics and slow V̇o2musc kinetics yield distinct deviations in the resultant V̇o2pulm responses compared with V̇o2musc kinetics. Therefore, the venous return models should be used with care and caution if the aim is to infer V̇o2musc by means of V̇o2pulm kinetics. Finally, the resultant V̇o2pulm responses seem to be complex and most likely unpredictable if no cardiodynamic measurements are available in vivo. NEW & NOTEWORTHY A single-compartment and a multi-compartment venous return model were tested to see whether they result in different pulmonary oxygen uptake (V̇o2pulm) kinetics from equal cardiac output and muscle oxygen uptake (V̇o2musc) kinetics. To infer V̇o2musc kinetics by means of V̇o2pulm kinetics, both models should only be used for V̇o2musc time constants ranging from 40 to 80 s. The resultant V̇o2pulm responses seem to be complex and most likely unpredictable if no cardiodynamic measurements are available.

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25

Li, Wen Yan, Xing Lei Liu, Qiu Luan Chen, and Feng Ming Chu. "The Performance Research on Reaction of Fe₂O₃/Al₂O₃ Oxygen Carrier and CO in Chemical-Looping Combustion Process." Advanced Materials Research 550-553 (July 2012): 974–78. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.974.

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Chemical-looping combustion (CLC) is a novel technology, which has inherent property of separating the greenhouse gas CO2, which uses oxygen carriers to transfer oxygen for combustion from air to fuel. The reactivity of Fe2O3/Al2O3 oxygen carrier was assessed by measuring their ability to oxidize CO. The kinetics and mechanism of oxygen carrier have been studied by TG and DTG techniques. The kinetic mechanism function of the reaction between Fe2O3/Al2O3 and CO has been built using the Coats-Redfern equation.

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26

Koschate, Jessica, Uwe Drescher, Klaus Baum, Christian Brinkmann, Thorsten Schiffer, Joachim Latsch, Klara Brixius, and Uwe Hoffmann. "Heart Rate and Oxygen Uptake Kinetics in Type 2 Diabetes Patients – A Pilot Study on the Influence of Cardiovascular Medication on Regulatory Processes." Experimental and Clinical Endocrinology & Diabetes 125, no. 05 (February 15, 2017): 275–81. http://dx.doi.org/10.1055/s-0042-119526.

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AbstractThe aim of this pilot study was to investigate whether there are differences in heart rate and oxygen uptake kinetics in type 2 diabetes patients, considering their cardiovascular medication. It was hypothesized that cardiovascular medication would affect heart rate and oxygen uptake kinetics and that this could be detected using a standardized exercise test. 18 subjects were tested for maximal oxygen uptake. Kinetics were measured in a single test session with standardized, randomized moderate-intensity work rate changes. Time series analysis was used to estimate kinetics. Greater maxima in cross-correlation functions indicate faster kinetics. 6 patients did not take any cardiovascular medication, 6 subjects took peripherally acting medication and 6 patients were treated with centrally acting medication. Maximum oxygen uptake was not significantly different between groups. Significant main effects were identified regarding differences in muscular oxygen uptake kinetics and heart rate kinetics. Muscular oxygen uptake kinetics were significantly faster than heart rate kinetics in the group with no cardiovascular medication (maximum in cross-correlation function of muscular oxygen uptake vs. heart rate; 0.32±0.08 vs. 0.25±0.06; p=0.001) and in the group taking peripherally acting medication (0.34±0.05 vs. 0.28±0.05; p=0.009) but not in the patients taking centrally acting medication (0.28±0.05 vs. 0.30±0.07; n.s.). It can be concluded that regulatory processes for the achievement of a similar maximal oxygen uptake are different between the groups. The used standardized test provided plausible results for heart rate and oxygen uptake kinetics in a single measurement session in this patient group.

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27

Niemeyer, Max, Renate Leithaeuser, and Ralph Beneke. "Oxygen uptake plateau occurrence depends on oxygen kinetics and oxygen deficit accumulation." Scandinavian Journal of Medicine & Science in Sports 29, no. 10 (June 24, 2019): 1466–72. http://dx.doi.org/10.1111/sms.13493.

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28

Wu, Ling Nan, Xiao Ying Hu, Cheng Long Ma, Chang Qing Dong, Zong Ming Zheng, and Yong Ping Yang. "Study on the Oxygen-Rich Gasification of Municipal Waste." Applied Mechanics and Materials 713-715 (January 2015): 2905–8. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.2905.

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The gasification of municipal waste was a promising technology for the clean and effective disposal of municipal waste, the oxygen-rich gasification was thought to increase the heating value of the derived gasification gas. To get a better understanding of the effect of oxygen concentration on the reaction kinetics, TG analysis was performed using model municipal waste, the kinetic characteristics were obtained and corresponding model was built.

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29

Gawas, Ramchandra, Joshua David Snyder, and Maureen Tang. "Improved Oxygen Reduction Reaction (ORR) Kinetics Via Interfacial Engineering." ECS Meeting Abstracts MA2022-02, no. 42 (October 9, 2022): 1542. http://dx.doi.org/10.1149/ma2022-02421542mtgabs.

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Sluggish oxygen reduction reaction (ORR) kinetics, even on the best available catalyst (Pt), is one of the major challenges in widespread commercialization of polymer electrolyte membrane fuel cells (PEMFC).1 Significant advances have been made towards making highly active Pt catalysts through nanostructuring, alloying, size, and shape control to mitigate these kinetic losses.2 An additional strategy for ORR activity enhancement is though the targeted engineering of the electrochemical interface. For example, Ionic liquid (IL) interlayers improve the ORR kinetics on bulk and nanostructured catalysts for both Pt and alloyed-Pt materials.3 Along with the kinetic enhancement, ionic liquid interlayers also mitigate the sulfonate adsorption on Pt and improve the durability of Pt/C thin films.4,5 Despite remarkable improvement in performance at half-cell and MEA-level, the mechanism of this improvement is not completely understood. In this work, we combine single crystal voltammetry with microkinetic modeling to analyze the mechanism of ORR enhancement in presence of ionic liquids. With iterative feedback between single crystal voltammetry and microkinetic model output, we establish the importance of accounting for lateral interactions between adsorbed oxygenated species by using real data informed adsorption isotherms. With our experimentally validated model, we show that the mechanism of impact of ILs on ORR activity is through exclusion of water and reduction in electrochemical interface solvation, yielding lower spectator hydroxyl coverages and a reduced barrier for hydroxyl removal, resulting in higher surface site availability during the ORR. This improved understanding will help design Pt-interfaces to moderate the interaction of the interfacial water network with Pt active sites, providing another strategy for improving ORR kinetics. References: Debe, M. K. Electrocatalyst approaches and challenges for automotive fuel cells. Nature 486, 43–51 (2012). Kulkarni, A., Siahrostami, S., Patel, A. & Nørskov, J. K. Understanding Catalytic Activity Trends in the Oxygen Reduction Reaction. Chem. Rev. 118, 2302–2312 (2018). Snyder, J., Fujita, T., Chen, M. W. & Erlebacher, J. Oxygen reduction in nanoporous metal-ionic liquid composite electrocatalysts. Nat. Mater. 9, 904–907 (2010). Li, Y., Hart, J. L., Profitt, L., Intikhab, S., Chatterjee, S., Taheri, M. & Snyder, J. D. Sequential Capacitive Deposition of Ionic Liquids for Conformal Thin Film Coatings on Oxygen Reduction Reaction Electrocatalysts. ACS Catal. 9, 9311–9316 (2019). Li, Y., Intikhab, S., Malkani, A., Xu, B. & Snyder, J. Ionic Liquid Additives for the Mitigation of Nafion Specific Adsorption on Platinum. ACS Catal. 10, 7691–7698 (2020). Figure 1

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Grady, C. P. L., J. S. Dang, D. M. Harvey, A. Jobbagy, and X. L. Wang. "Determination of Biodegradation Kinetics through Use of Electrolytic Respirometry." Water Science and Technology 21, no. 8-9 (August 1, 1989): 957–68. http://dx.doi.org/10.2166/wst.1989.0298.

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The purpose of this work was to demonstrate that it is possible to determine the kinetics of biodegradation of single organic compounds by using only measurements of oxygen consumption in batch reactors. Batch experiments were conducted using acclimated biomass growing on aniline or benzoic acid in which simultaneous determinations over time were made of oxygen consumption, substrate removal (by SCOD, DOC and 14C) and cell growth. Kinetic parameters were estimated by applying nonlinear curve-fitting techniques to each of the data sets. There were no important differences between the parameter estimates determined from oxygen consumption data and any of the measurements of substrate removal. In general, parameter estimates made with cell growth data were the least reliable.

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31

WALSH, L. Michael. "Possible Mechanisms of Oxygen Uptake Kinetics." Annals of physiological anthropology 11, no. 3 (1992): 215–23. http://dx.doi.org/10.2114/ahs1983.11.215.

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Hayles, Justin A., and Bryan A. Killingsworth. "Constraints on triple oxygen isotope kinetics." Chemical Geology 589 (February 2022): 120646. http://dx.doi.org/10.1016/j.chemgeo.2021.120646.

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STEWART, IAN B., ANDREW C. BULMER, JAMES E. SHARMAN, and LYNNE RIDGWAY. "Arterial Oxygen Desaturation Kinetics during Apnea." Medicine & Science in Sports & Exercise 37, no. 11 (November 2005): 1871–76. http://dx.doi.org/10.1249/01.mss.0000176305.51360.7e.

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Gottschalk, S., H. Hahn, S. Flege, and A. G. Balogh. "Oxygen vacancy kinetics in ferroelectric PbZr0.4Ti0.6O3." Journal of Applied Physics 104, no. 11 (December 2008): 114106. http://dx.doi.org/10.1063/1.2988902.

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Schäfer, Dirk, Markus Ebert, Ralf Köber, Volkmar Plagentz, and Andreas Dahmke. "Kinetics of Oxygen Release from ORC." Bioremediation Journal 10, no. 1-2 (July 2006): 71–82. http://dx.doi.org/10.1080/10889860600835484.

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Narvaez Perez, Galo E., Galo E. Narvaez Alban, and Rafael Santelices. "Oxygen Kinetics During Specific Intermittent Work." Medicine & Science in Sports & Exercise 41 (May 2009): 115. http://dx.doi.org/10.1249/01.mss.0000354909.57096.73.

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Devine, R. A. B., J. J. Capponi, and J. Arndt. "Oxygen-diffusion kinetics in densified, amorphousSiO2." Physical Review B 35, no. 2 (January 15, 1987): 770–73. http://dx.doi.org/10.1103/physrevb.35.770.

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Gupta, B. D., V. Vijai Kanth, and Veena Singh. "Organocobaloximes: synthesis, oxygen insertion and kinetics." Journal of Organometallic Chemistry 570, no. 1 (November 1998): 1–7. http://dx.doi.org/10.1016/s0022-328x(98)00809-2.

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Hackbarth, Steffen, Sebastian Pfitzner, Liang Guo, Jiechao Ge, Pengfei Wang, and Beate Röder. "Singlet Oxygen Kinetics in Polymeric Photosensitizers." Journal of Physical Chemistry C 122, no. 22 (May 2, 2018): 12071–76. http://dx.doi.org/10.1021/acs.jpcc.8b02052.

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Bartlett, Robert H., and Ronald E. Dechert. "Oxygen kinetics: Pitfalls in clinical research." Journal of Critical Care 5, no. 2 (June 1990): 77–80. http://dx.doi.org/10.1016/0883-9441(90)90051-a.

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Kovalev, A. S., D. V. Lopaev, Yu A. Mankelevich, N. A. Popov, T. V. Rakhimova, A. Yu Poroykov, and D. L. Carroll. "Kinetics of in oxygen RF discharges." Journal of Physics D: Applied Physics 38, no. 14 (July 1, 2005): 2360–70. http://dx.doi.org/10.1088/0022-3727/38/14/010.

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Stan, M., Y. T. Zhu, H. Jiang, and D. P. Butt. "Kinetics of oxygen removal from ceria." Journal of Applied Physics 95, no. 7 (April 2004): 3358–61. http://dx.doi.org/10.1063/1.1650890.

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Dattagupta, S., and S. K. Ghoshal. "Kinetics of oxygen defect in YBCO." Bulletin of Materials Science 20, no. 4 (July 1997): 481–89. http://dx.doi.org/10.1007/bf02744760.

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Armstrong, Neil, and Alan R. Barker. "Oxygen Uptake Kinetics in Children and Adolescents: A Review." Pediatric Exercise Science 21, no. 2 (May 2009): 130–47. http://dx.doi.org/10.1123/pes.21.2.130.

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The pulmonary oxygen uptake (pVO2) kinetic response at the onset of exercise provides a noninvasive window into the metabolic activity of the muscle and a valuable means of increasing our understanding of developmental muscle metabolism. However, to date only limited research has been devoted to investigating the pVO2 kinetic response during exercise in children and adolescents. From the rigorous studies that have been conducted, both age- and sex-related differences have been identified. Specifically, children display a faster exponential rise in the phase II pVO2 kinetics, which are purported to reflect the rise in muscle O2 consumption, during moderate, heavy and very heavy intensity exercise compared with adults. Furthermore, for heavy and very heavy exercise, the O2 cost of exercise is higher for the exponential phase and the magnitude of the pVO2 slow component is smaller in young children. Sex-related differences have been identified during heavy, but not moderate exercise, with prepubertal boys displaying a faster exponential phase II pVO2 kinetic response and a smaller pVO2 slow component compared with prepubertal girls. The mechanisms underlying these differences are currently poorly understood, and form the basis for future research in this area. However, it is hypothesized that an age-related modulation of the muscle phosphate feedback controllers to signal an increased rate of oxidative phosphorylation and/or altered muscle fiber type recruitment strategies have the potential to play an important role. Overall, the data support the view that at the onset of exercise children have an enhanced potential for oxidative metabolism in the myocyte compared with adults.

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Uğuz, Özlem, Hanzade Haykiri-Açma, and Serdar Yaman. "Combustion kinetics of lignite preheated under oxygen-enriched conditions." Energy & Environment 31, no. 5 (October 21, 2019): 813–24. http://dx.doi.org/10.1177/0958305x19882393.

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This study bases on the testing of the solid-state kinetic models to determine the combustion kinetics of thermally pretreated Turkish lignite (Adiyaman–Golbasi) in O2-enriched environment. The lignite sample was first preheated in a horizontal tube furnace at temperatures of 200°C, 400°C and 600°C that correspond to torrefaction, partly devolatilization and partly ashing temperatures. Oxidative environments that have the O2 concentrations of 21, 30, 40 and 50 vol.%. were created during this treatment by changing the ratio of O2/N2 in the binary gas mixtures. The solid residues remaining after oxidation were then subjected to non-isothermal combustion conditions in a thermal analyzer up to 900°C under dry air atmosphere. The conversion degrees calculated from the thermogravimetric analysis were used to establish the kinetic parameters based on the Coats–Redfern method. It was concluded that the first-order reaction model fits well for both the combustion of volatiles and the burning of the char. It was also seen that the concentration of O2 in the pre-oxidation stage plays an important role as treatment temperature also increases. Moreover, it was also concluded that the activation energies for the char burning regions of the samples treated at 200°C and 400°C differ seriously.

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Schmidtke, T. "Oxygen release kinetics from solid phase oxygen in Arctic Alaska." Journal of Hazardous Materials 64, no. 2 (January 29, 1999): 157–65. http://dx.doi.org/10.1016/s0304-3894(98)00243-x.

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Hu, Wenting, Felix Donat, S. A. Scott, and J. S. Dennis. "Kinetics of oxygen uncoupling of a copper based oxygen carrier." Applied Energy 161 (January 2016): 92–100. http://dx.doi.org/10.1016/j.apenergy.2015.10.006.

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ONARICI GÜNGÖR, ELVIN, CELIL KAÇOĞLU, ALI ONUR CERRAH, and İLKER YILMAZ. "Cardiovascular-metabolic responses and oxygen uptake kinetics during kayak paddling in normobaric hypoxia in young flatwater kayakers." Baltic Journal of Health and Physical Activity 13, no. 4 (December 31, 2021): 59–71. http://dx.doi.org/10.29359/bjhpa.13.4.07.

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Background: The aim of the study was to evaluate response of cardiovascular, metabolic and oxygen consumption kinetics at kayak paddling exercise in the normoxic and normobaric environment. Material and Methods: Seven kayakers (age: 16±1.2 year; height: 165±8.3cm; body weight: 53±8kg; fat percentage: 17±4.4%; VO2max: 34.57±9.24 ml.kg-1.dk-1; Maximal La: 8.72±2.75 mM) with four years’ experience participated in the study. All subjects performed incremental maximal and sub-threshold constant load kayak paddling tests in normoxic and normobaric hypoxic conditions on different days. According to maximal tests results, the individual anaerobic threshold and VO2max values were determined. Results: VO2max, HRmax, peak power and maximal lactate values demonstrated statistical significant differences between the normobaric hypoxia and normoxic environment. The response of VO2max was found higher in the normoxic than the normobaric environment. Oxygen uptake kinetic was statistically (p<0.05) faster, and O2 values were lower (p<0.05) in the normoxic than the normobaric environment. Recovery kinetics was found to be statistically faster (p<0.05) in the hypoxia than in the normoxia environment. Conclusions: The ATP supply in an anaerobic way was higher in the normoxic environment than in the normobaric environment, and lactate tolerance increased. Having faster oxygen uptake kinetics in the normoxic environment shows that the volume of oxygen deficit is lower. Faster recovery kinetics in normobaric hypoxia shows the positive effects of altitude on recovery.

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Pan, Xiao Feng, Le Fan Ma, Qin Qin Qu, Jia Liang Lan, and Li Hong Tan. "The Kinetics of Oxygen Delignification of Reed Kraft Pulp (I)-Kinetics of Delignification." Advanced Materials Research 236-238 (May 2011): 1420–24. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1420.

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The kinetics of reed kraft pulp oxygen delignification process is studied, suitable kinetics model determined is -dk/dt=Aexp(-E/RT) [OH-]b[PO2]cKa, and the parameters in the model is calculated. The function for estimation of the kappa number at different reaction time is established for the reed kraft pulp oxygen delignification process. The reaction order fitted is 6.72 for delignification (a), 0.87 for alkali concentration (b), and 0.62 for oxygen pressure(c), respectively. The activation energy E is 80.96KJ/mol and frequency factor A 1.5×104.

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Setoodeh Jahromy, Saman, Felix Birkelbach, Christian Jordan, Clemens Huber, Michael Harasek, Andreas Werner, and Franz Winter. "Impact of Partial Pressure, Conversion, and Temperature on the Oxidation Reaction Kinetics of Cu2O to CuO in Thermochemical Energy Storage." Energies 12, no. 3 (February 5, 2019): 508. http://dx.doi.org/10.3390/en12030508.

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Metal oxides are promising potential candidates for thermochemical energy storage in concentrated solar power plants. In particular, the Cu2O/CuO system is suitable because of its high energy density, applied temperature interval, and reduced cost compared to the CoO/Co3O4 system. In heterogenous gas-solid reactions, the pressure affects the kinetics significantly. To quantify this effect for oxidation of Cu2O to CuO, isothermal runs between 800 °C and 930 °C at different oxygen partial pressures (0.1, 0.2, 0.5, and 1.0 bar) were conducted with thermogravimetric analysis (TGA). Defined fractions of CuO samples (1–100 µm) were analyzed with X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, and scanning electron microscopy (SEM) analysis. The kinetic analyses were performed with extended non-parametric kinetics (NPK), which is applied for the first time to consider the pressure term in the general kinetic equation in addition to the conversion and the temperature term. The results show how the oxygen partial pressure impacts the kinetics and how reparameterization of the pressure term affects the kinetic analysis of the oxidation reaction of Cu2O to CuO. The best conversion model is a two-dimensional Avrami-Erofeev model with an activation energy of 233 kJ/mol. The kinetic models for conversion, temperature, and pressure presented in this work provide one of the most important requirements for reactor designs.

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