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Relevant bibliographies by topics / Autocatalytic reaction

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Academic literature on the topic 'Autocatalytic reaction'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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Journal articles on the topic "Autocatalytic reaction"

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Fedotov, Vladislav Kh, Nikolay I. Kol'tsov, and Petr M. Kosianov. "INFLUENCE OF THE AUTOCATALYTIC STAGES ON THE DYNAMICS OF CONJUGATED CHEMICAL REACTIONS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 63, no. 2 (February 8, 2020): 14–20. http://dx.doi.org/10.6060/ivkkt.20206302.6053.

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Chemical reactions occurring on nonlinear mechanisms, containing the stage of interaction of various reagents (feedback), can exhibit unusual kinetic properties - the multiplicity of equilibria (hysteresis of different shape dependency on the «velocity-parameter»), change the time of the motion to the equilibrium (slow or fast relaxation), sustained oscillations (regular, irregular), etc. All these critical phenomena are usually associated with the appearance of unstable equilibria in the reactions under study. From the kinetic point of view, one of the main causes of instability is the presence of autocatalytic stages in the reaction mechanism. Therefore, it is interesting to study the effect of autocatalytic stages on the kinetics of chemical reactions, especially far from equilibrium. In this regard, the dynamic characteristics of typical conjugate reactions occurring by non-autocatalytic and autocatalytic mechanisms in an isothermal reactor of ideal mixing under the same conditions are compared in this paper. It is shown that the kinetics of these reactions is different: autocatalysis can shift the equilibrium, change the relaxation time and the rate of reactions. In an irreversible consecutive reaction (far from equilibrium) autocatalysis shifts the equilibrium in the direction of increasing the proportion occupied by the surface of the catalyst and the reaction rate dominated by positive autocatalysis. As the reversible processes increase, the balance shifts to the other side, the reaction slows down and autoinhibition begins to prevail. In parallel conjugate reactions, negative autocatalysis is not observed. In both types of the considered conjugate reactions, the maximum positive change in concentrations and velocity due to autocatalysis observed when these reactions are irreversible.

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Qi, Yuanwei, and Yi Zhu. "Computational Study of Traveling Wave Solutions of Isothermal Chemical Systems." Communications in Computational Physics 19, no. 5 (May 2016): 1461–72. http://dx.doi.org/10.4208/cicp.scpde14.38s.

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AbstractThis article studies propagating traveling waves in a class of reaction-diffusion systems which model isothermal autocatalytic chemical reactions as well as microbial growth and competition in a flow reactor. In the context of isothermal autocatalytic systems, two different cases will be studied. The first is autocatalytic chemical reaction of order m without decay. The second is chemical reaction of order m with a decay of order n, where m and n are positive integers and m>n≥1. A typical system in autocatalysis is A+2B→3B and B→C involving two chemical species, a reactant A and an auto-catalyst B and C an inert chemical species.The numerical computation gives more accurate estimates on minimum speed of traveling waves for autocatalytic reaction without decay, providing useful insight in the study of stability of traveling waves.For autocatalytic reaction of order m = 2 with linear decay n = 1, which has a particular important role in chemical waves, it is shown numerically that there exist multiple traveling waves with 1, 2 and 3 peaks with certain choices of parameters.

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Blokhuis, Alex, David Lacoste, and Philippe Nghe. "Universal motifs and the diversity of autocatalytic systems." Proceedings of the National Academy of Sciences 117, no. 41 (September 28, 2020): 25230–36. http://dx.doi.org/10.1073/pnas.2013527117.

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Autocatalysis is essential for the origin of life and chemical evolution. However, the lack of a unified framework so far prevents a systematic study of autocatalysis. Here, we derive, from basic principles, general stoichiometric conditions for catalysis and autocatalysis in chemical reaction networks. This allows for a classification of minimal autocatalytic motifs called cores. While all known autocatalytic systems indeed contain minimal motifs, the classification also reveals hitherto unidentified motifs. We further examine conditions for kinetic viability of such networks, which depends on the autocatalytic motifs they contain and is notably increased by internal catalytic cycles. Finally, we show how this framework extends the range of conceivable autocatalytic systems, by applying our stoichiometric and kinetic analysis to autocatalysis emerging from coupled compartments. The unified approach to autocatalysis presented in this work lays a foundation toward the building of a systems-level theory of chemical evolution.

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Skorb, Ekaterina V., and Sergey N. Semenov. "Mathematical Analysis of a Prototypical Autocatalytic Reaction Network." Life 9, no. 2 (May 20, 2019): 42. http://dx.doi.org/10.3390/life9020042.

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Network autocatalysis, which is autocatalysis whereby a catalyst is not directly produced in a catalytic cycle, is likely to be more common in chemistry than direct autocatalysis is. Nevertheless, the kinetics of autocatalytic networks often does not exactly follow simple quadratic or cubic rate laws and largely depends on the structure of the network. In this article, we analyzed one of the simplest and most chemically plausible autocatalytic networks where a catalytic cycle is coupled to an ancillary reaction that produces the catalyst. We analytically analyzed deviations in the kinetics of this network from its exponential growth and numerically studied the competition between two networks for common substrates. Our results showed that when quasi-steady-state approximation is applicable for at least one of the components, the deviation from the exponential growth is small. Numerical simulations showed that competition between networks results in the mutual exclusion of autocatalysts; however, the presence of a substantial noncatalytic conversion of substrates will create broad regions where autocatalysts can coexist. Thus, we should avoid the accumulation of intermediates and the noncatalytic conversion of the substrate when designing experimental systems that need autocatalysis as a source of positive feedback or as a source of evolutionary pressure.

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Baier, Gerold, and Sven Sahle. "Spatio-temporal patterns with hyperchaotic dynamics in diffusively coupled biochemical oscillators." Discrete Dynamics in Nature and Society 1, no. 2 (1997): 161–67. http://dx.doi.org/10.1155/s1026022697000162.

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We present three examples how complex spatio-temporal patterns can be linked to hyperchaotic attractors in dynamical systems consisting of nonlinear biochemical oscillators coupled linearly with diffusion terms. The systems involved are: (a) a two-variable oscillator with two consecutive autocatalytic reactions derived from the Lotka–Volterra scheme; (b) a minimal two-variable oscillator with one first-order autocatalytic reaction; (c) a three-variable oscillator with first-order feedback lacking autocatalysis. The dynamics of a finite number of coupled biochemical oscillators may account for complex patterns in compartmentalized living systems like cells or tissue, and may be tested experimentally in coupled microreactors.

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Simoyi, Reuben H. "Autocatalytic chlorite-bromide reaction." Journal of Physical Chemistry 89, no. 16 (August 1985): 3570–74. http://dx.doi.org/10.1021/j100262a029.

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Gyevi-Nagy, László, Emese Lantos, Tünde Gehér-Herczegh, Ágota Tóth, Csaba Bagyinka, and Dezső Horváth. "Reaction fronts of the autocatalytic hydrogenase reaction." Journal of Chemical Physics 148, no. 16 (April 28, 2018): 165103. http://dx.doi.org/10.1063/1.5022359.

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El-Sayed, Saad A. "Explosion characteristics of autocatalytic reaction." Combustion and Flame 133, no. 3 (May 2003): 375–78. http://dx.doi.org/10.1016/s0010-2180(03)00014-2.

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El-Sayed, Saad A. "Thermal explosion of autocatalytic reaction." Journal of Loss Prevention in the Process Industries 16, no. 4 (July 2003): 249–57. http://dx.doi.org/10.1016/s0950-4230(03)00039-1.

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Stadler, Peter F., and Peter Schuster. "Mutation in autocatalytic reaction networks." Journal of Mathematical Biology 30, no. 6 (1992): 597–631. http://dx.doi.org/10.1007/bf00948894.

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Dissertations / Theses on the topic "Autocatalytic reaction"

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Agliari, Elena, Raffaella Burioni, Davide Cassi, and Franco M. Neri. "Autocatalytic reaction-diffusion processes in restricted geometries." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-192966.

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Agliari, Elena, Raffaella Burioni, Davide Cassi, and Franco M. Neri. "Autocatalytic reaction-diffusion processes in restricted geometries." Diffusion fundamentals 7 (2007) 1, S. 1-8, 2007. https://ul.qucosa.de/id/qucosa%3A14157.

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Iwamura, Hiroshi. "Mechanistic insights from kinetic analysis by reaction calorimetry into proline-catalyzed asymmetric reactions and autocatalytic reaction." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/136952.

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Quaranta, Michela. "Mechanistic study of asymmetric amplification in the Soai autocatalytic reaction." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6202.

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Soai’s discovery of chiral amplification in the autocatalytic alkylation of pyrimidine-5-carbaldehyde with diisopropylzinc is one of the most noteworthy findings of the last decade of the 20th century. This is the first experimental confirmation of an early theoretical rationalisation of autocatalysis as a mechanism for the evolution of biological homochirality from a racemic environment (Frank, 1953). This thesis describes kinetic and spectroscopic investigations that were conducted with the aim of better understanding the mechanism under which chiral amplification is achieved in the Soai system. The methodology used to perform the kinetic studies that are presented in this thesis focuses on the use of reaction calorimetry as in-situ tool coupled with the appropriate analytical technique for enantiomeric excess measurements. Observations of an unusual temperature effect on the reaction rate and a profound induction period are reported together with extensive kinetic investigations. Kinetic experiments were designed and carried out following Reaction Progress Kinetic Analysis methodology, which is described in detail. These experiments were carried out in order to ascertain the concentration dependence of the substrates and the reaction product, and revealed a 1.6 order in pyrimidyl aldehyde, a zero order in diisopropylzinc and a first order in the reaction product. Meticulous NMR studies of the alkoxide product at low temperature demonstrated its tendency to form tetrameric complexes, which could be either directly involved in the autocatalysis or be the precursors of the active catalytic species. Possible mechanisms that involve tetramers formation are proposed and supported by simulations carried out using COPASI simulation software. This thesis also includes a separate Chapter on the MIB mediated alkylation of benzaldehyde with diethylzinc, a system characterised by a marked nonlinear effect. Kinetic studies demonstrate how the high degree of chiral amplification comes at the expense of the reaction rate.

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Al-Mannai, Muna. "Finite-difference methods for some non-linear reaction-diffusion systems in chemistry." Thesis, Brunel University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390219.

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Mee, Trevor Richard. "Analysis of the proteolytic cleavage reaction of the tumour suppressor protein p53." Thesis, University of York, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310987.

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Fusion, Joe. "The Role of Environmental Dynamics in the Emergence of Autocatalytic Networks." PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2458.

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For life to arise from non-life, a metabolism must emerge and maintain itself, distinct from its environment. One line of research seeking to understand this emergence has focused on models of autocatalytic reaction networks (ARNs) and the conditions that allow them to approximate metabolic behavior. These models have identified reaction parameters from which a proto-metabolism might emerge given an adequate matter-energy flow through the system. This dissertation extends that research by answering the question: can dynamically structured interactions with the environment promote the emergence of ARNs? This question was inspired by theories that place the origin of life in contexts such as diurnal or tidal cycles. To answer it, an artificial chemistry system with ARN potential was implemented in the dissipative particle dynamics (DPD) modeling paradigm. Unlike differential equation (DE) models favored in prior ARN research, the DPD model is able to simulate environmental dynamics interacting with discrete particles, spatial heterogeneity, and rare events. This dissertation first presents a comparison of the DPD model to published DE results, showing qualitative similarity with some interesting differences. Multiple examples are then provided of dynamically changing flows from the environment that promote emergent ARNs more than constant flows. These include specific cycles of energy and mass flux that consistently increase metrics for ARN concentration and mass focusing. The results also demonstrate interesting nonlinear interactions between the system and cycle amplitude and period. These findings demonstrate the relevance that environmental dynamics has to ARN research and the potential for broader application as well.

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Blanken, Erika. "A NUMERICAL ANALYSIS APPROACH FOR ESTIMATING THE MINIMUM TRAVELING WAVE SPEED FOR AN AUTOCATALYTIC REACTION." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2389.

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This thesis studies the traveling wavefront created by the autocatalytic cubic chemical reaction A + 2B → 3B involving two chemical species A and B, where A is the reactant and B is the auto-catalyst. The diffusion coefficients for A and B are given by and . These coefficients differ as a result of the chemical species having different size and/or weight. Theoretical results show there exist bounds, and , depending on , where for speeds , a traveling wave solution exists, while for speeds , a solution does not exist. Moreover, if , and are similar to one another and in the order of when it is small. On the other hand, when there exists a minimum speed vmin, such that there is a traveling wave solution if the speed v > vmin. The determination of vmin is very important in determining the dynamics of general solutions. To fill in the gap of the theoretical study, we use numerical methods to determine vmin for various cases. The numerical algorithm used is the fourth-order Runge-Kutta method (RK4).
M.S.
Department of Mathematics
Sciences
Mathematical Science MS

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Boerner, Susann. "Probing reaction conditions and cofactors of conformational prion protein changes underlying the autocatalytic self-propagation of different prion strains." Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2014. http://dx.doi.org/10.18452/17003.

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Prionen sind das infektiöse Agens transmissibler spongiformer Enzephalopathien von Tieren und Menschen. Prionen bestehen hauptsächlich aus einer abnormal gefalteten und aggregierten Isoform des zellulären Prionproteins (PrP). Die Replikation von Prionen findet mutmaßlich durch keiminduzierte Polymerisation des Prionproteins statt. Es existieren verschiedene Prionstämme, die unterschiedliche Eigenschaften aufweisen, aber vom selben zellulären Prionprotein abstammen können. Neben PrP scheinen Kofaktormoleküle an der Prionreplikation beteiligt zu sein. Weiterhin wird angenommen, dass Kofaktoren bei der Definition von Stammeigenschaften beteiligt sind, sowie ein Einfluss auf die Infektiosität von Prionen besteht. In dieser Arbeit wurden die Auswirkungen verschiedener Kofaktoren auf die Replikation von vier Hamster-adaptierten Prionstämmen in vitro mittels der Methode der „Protein Misfolding Cyclic Amplification“ (PMCA) untersucht. Es wurden stammabhängige Unterschiede bezüglich der Anforderungen an die Replikationsbedingungen in der PMCA, sowie Kofaktor-Selektivitäten festgestellt. Der Einfluss von Kofaktoren wurde durch den Vergleich ausgewählter biologischer, biochemischer und biophysikalischer Eigenschaften von in vitro erzeugten PMCA Produkten (PrPres) mit denen nativer Prionkeime untersucht. Es zeigte sich, dass Kofaktoren Stammeigenschaften, wie die biologische Keimaktivität in primären Gliazellkulturen und biochemische Eigenschaften, wie die Migration in SDS-Gelen, beeinflussen können. Um festzustellen, ob unterschiedliche Kofaktorbedingungen während der PMCA messbare Veränderungen der Proteinkonformation hervorrufen, wurde PMCA generiertes PrPres mittels FT-IR Spektroskopie in einer Pilotstudie charakterisiert. Erste Befunde zeigten spektrale Unterschiede zwischen den Proteinkeimen und deren PMCA Produkten bei allen Stämmen, unabhängig von den Kofaktorbedingungen.
Prions are the causative agent of transmissible spongiform encephalopathies in animals and humans such as scrapie, bovine spongiform encephalopathy (BSE) and Creutzfeldt-Jakob disease (CJD). Prions are thought to be composed essentially of a misfolded and aberrantly aggregated isoform of the cellular prion protein (PrP) and to replicate by seeded PrP polymerization. Prions may exist in the form of distinct strains that differ in their phenotypic characteristics although they are derived from the same cellular prion protein. Cofactor molecules other than PrP may be involved in prion replication and may be a determinant of strain properties. Furthermore, cofactors may also be required for conveying infectivity. The present study examined the effects of different cofactor molecules on the replication efficacy of four hamster adapted prion agents using the method of serial protein misfolding cyclic amplification (PMCA) as in vitro assay for PrP misfolding and aggregation. The study revealed strain dependent differences of PMCA conditions and cofactors required for efficient in vitro replication. The impact of cofactors was assessed by comparative analyses of selected biological, biochemical and biophysical properties of PMCA products (PrPres) and native prion seeds. The biological seeding activity as monitored in a primary hamster glial cell assay, and biochemical properties such as electrophoretic migration in SDS-gels, were affected differently by different cofactors. In order to define the impact of putative cofactors on the molecular conversion of PrP in more detail, changes in the spatial structure associated with different cofactor molecule conditions during amplification of PrPres in PMCA was monitored by Fourier transform-infrared (FT-IR) spectroscopic analysis. Largely preliminary data revealed spectral differences between native prion seeds and progeny PMCA generated PrPres for all prion strains, but no variations due to different cofactor conditions.

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Menon, Shakti Narayana. "Bifurcation problems in chaotically stirred reaction-diffusion systems." University of Sydney, 2008. http://hdl.handle.net/2123/3685.

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Doctor of Philosophy
A detailed theoretical and numerical investigation of the behaviour of reactive systems under the influence of chaotic stirring is presented. These systems exhibit stationary solutions arising from the balance between chaotic advection and diffusion. Excessive stirring of such systems results in the termination of the reaction via a saddle-node bifurcation. The solution behaviour of these systems is analytically described using a recently developed nonperturbative, non-asymptotic variational method. This method involves fitting appropriate parameterised test functions to the solution, and also allows us to describe the bifurcations of these systems. This method is tested against numerical results obtained using a reduced one-dimensional reaction-advection-diffusion model. Four one- and two-component reactive systems with multiple homogeneous steady-states are analysed, namely autocatalytic, bistable, excitable and combustion systems. In addition to the generic stirring-induced saddle-node bifurcation, a rich and complex bifurcation scenario is observed in the excitable system. This includes a previously unreported region of bistability characterised by a hysteresis loop, a supercritical Hopf bifurcation and a saddle-node bifurcation arising from propagation failure. Results obtained with the nonperturbative method provide a good description of the bifurcations and solution behaviour in the various regimes of these chaotically stirred reaction-diffusion systems.

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Books on the topic "Autocatalytic reaction"

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Billlingham, John. Travelling waves and clock reactions in quadratic and cubic autocatalysis. Norwich: University of East Anglia, 1991.

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Book chapters on the topic "Autocatalytic reaction"

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Sokolov, Igor M., and Daniela Froemberg. "Front Propagation in an Autocatalytic Reaction-Subdiffusion System." In Fractional Dynamics and Control, 239–47. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0457-6_20.

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Kaas-Petersen, Christian. "Bi-periodicity in an isothermal autocatalytic reaction-diffusion system." In Continuation Techniques and Bifurcation Problems, 187–98. Basel: Birkhäuser Basel, 1990. http://dx.doi.org/10.1007/978-3-0348-5681-2_12.

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Lavabre, Dominique, Jean-Claude Micheau, Jesús Rivera Islas, and Thomas Buhse. "Kinetic Insight into Specific Features of the Autocatalytic Soai Reaction." In Topics in Current Chemistry, 67–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/128_2007_149.

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Filisetti, Alessandro, Marco Villani, Chiara Damiani, Alex Graudenzi, Andrea Roli, Wim Hordijk, and Roberto Serra. "On RAF Sets and Autocatalytic Cycles in Random Reaction Networks." In Communications in Computer and Information Science, 113–26. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12745-3_10.

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Doungmo Goufo, Emile F., and A. Atangana. "Modulating Chaotic Oscillations in Autocatalytic Reaction Networks Using Atangana–Baleanu Operator." In Studies in Systems, Decision and Control, 135–58. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11662-0_9.

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Soai, Kenso, and Tsuneomi Kawasaki. "Asymmetric Autocatalysis of Pyrimidyl Alkanol." In Inventing Reactions, 261–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/3418_2012_48.

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Mancusi, E., P. L. Maffettone, and S. Crescitelli. "A Non-Linear Analysis of a Bubble Column with Autocatalytic Reactions." In Nonlinear Dynamics and Control in Process Engineering — Recent Advances, 153–61. Milano: Springer Milan, 2002. http://dx.doi.org/10.1007/978-88-470-2208-9_10.

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Brown, John M., Ilya Gridnev, and Jürgen Klankermayer. "Asymmetric Autocatalysis with Organozinc Complexes; Elucidation of the Reaction Pathway." In Topics in Current Chemistry, 35–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/128_2007_15.

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Ashaari, Azmirul, Tahir Ahmad, Mustaffa Shamsuddin, and Wan Munirah Wan Mohammad. "An Autocatalytic Model of a Pressurized Water Reactor in a Nuclear Power Generation." In Communications in Computer and Information Science, 106–15. Singapore: Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-287-936-3_11.

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Ross, John, Igor Schreiber, and Marcel O. Vlad. "Oscillatory Reactions." In Determination of Complex Reaction Mechanisms. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195178685.003.0013.

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Oscillating chemical reactions have the distinct property of a periodic or aperiodic oscillatory course of concentrations of reacting chemical species as well as temperature. This behavior is due to an interplay of positive and negative feedback with alternating dominance of these two dynamic effects. For example, an exothermic reaction produces heat that increases temperature, which in turn increases reaction rate and thus produces more heat. Such a thermokinetic effect is thus autocatalytic and represents a positive feedback. When run in a flow-through reactor with a cooling jacket, the autocatalysis is eventually suppressed if the reactant is consumed faster than it is supplied. At the same time, the excess heat is being removed via the jacket, which tends to quench the system. The latter two processes are inhibitory and represent a negative feedback. If the heat removal is slow enough so as not to suppress entirely the autocatalysis, but fast enough for temperature to drop before there is enough reactant available via the feed to restore autocatalysis, then there are oscillations in both temperature and concentration of the reactant. Examples of these thermokinetic oscillations are combustion reactions, which typically take place either in homogeneous gaseous or liquid phase or in the presence of a solid catalyst, thus representing a heterogeneous reaction system. Of more interest in the present context are reactions where thermal effects are often negligible, or the system is maintained at constant temperature, as is the case with homogeneous chemical reactions taking place in a thermostated flow-through reactor, as well as biochemical reactions in living cells and organisms. Autocatalysis can easily be realized in isothermal systems, where instead of a heat-producing reaction there will typically be a closed reaction pathway, such that species involved are produced faster by reactions along the pathway than they are consumed by removal reactions. As an example, let us examine the well-known Belousov–Zhabotinsky (BZ) reaction of bromate with malonic acid catalyzed by cerium ions in acidic solution.

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Conference papers on the topic "Autocatalytic reaction"

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Yakubu, Aisha Aliyu, and Yazariah Mohd Yatim. "A cubic autocatalytic reaction in a continuous stirred tank reactor." In THE 22ND NATIONAL SYMPOSIUM ON MATHEMATICAL SCIENCES (SKSM22): Strengthening Research and Collaboration of Mathematical Sciences in Malaysia. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4932441.

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Schafsteller, B., G. Ramos, K. Tuna, and S. Nelle. "Characterization of thick tin deposits by autocatalytic reaction and electrochemical investigations of autocatalytic tin electrolytes and their reaction mechanisms." In 2019 IEEE CPMT Symposium Japan (ICSJ). IEEE, 2019. http://dx.doi.org/10.1109/icsj47124.2019.8998646.

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Decraene, James, George G. Mitchell, and Barry McMullin. "Crosstalk and the cooperation of collectively autocatalytic reaction networks." In 2009 IEEE Congress on Evolutionary Computation (CEC). IEEE, 2009. http://dx.doi.org/10.1109/cec.2009.4983220.

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Suzuki, Haruki, Taichi Takii, and Shingo Oda. "The Study for Installation of the Autocatalytic Flammability Control System in New ABWR Plants." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75836.

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As a measure to prevent the generation of combustible hydrogen/oxygen gases expected in an ABWR accident, a flammability control system (FCS) needs to be installed. The autocatalytic FCS, which has been introduced mainly in Europe and the US, is composed of multiple passive autocatalytic recombiners (PARs) and is capable of recombining hydrogen and oxygen at room temperature (low activation energy) by catalysis. Unlike conventional forced-circulation and heating FCS, the autocatalytic FCS is a passive system that does not need operator startup; it also has a simple structure, without components requiring power supplies, such as blowers and heaters. Thus, it is superior in terms of reliability and operability. This system is considerably smaller than a conventional FCS, and can be installed in portions within the pressure containment vessel (PCV); conventional FCSs are installed inside the reactor building (outside the PCV). So autocatalytic FCS makes it possible to reduce the size of the building, and construction costs as well. Though multiple tests have been performed in Europe and the US on the autocatalytic FCS for product development and to check performance[1],[2],[3],[4], before introducing this FCS to a new ABWR plants, some additional tests have been performed with consideration for Japanese BWR accident conditions like PCV spray, influence of low oxygen condition and reaction inhibition in the collaborative research by Japanese electric power companies. These include examining the influences of low-oxygen conditions and reaction inhibitors. This paper presents the details of additional studies made after considering results of the additional tests performed in Japan to install the autocatalytic FCS instead of the thermo-reactive FCS.

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Ananthaswamy, V., and S. Narmatha. "Approximate analytical solution of non-linear reaction-diffusion equations in a cubic-autocatalytic reaction with Michaelis–Menten decay." In INTERNATIONAL VIRTUAL CONFERENCE ON RECENT MATERIALS AND ENGINEERING APPLICATIONS FOR SUSTAINABLE ENVIRONMENT (ICRMESE2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0058275.

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Eskew, Matthew W., and Reuben H. Simoyi. "Video: Simultaneous fingering, double-diffusive convection, and thermal plumes derived from autocatalytic exothermic reaction fronts." In 69th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2016. http://dx.doi.org/10.1103/aps.dfd.2016.gfm.v0060.

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Cao, Le, and Eva Gutheil. "Modeling and Simulation of Tropospheric Ozone Depletion in the Polar Spring." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-22045.

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In polar spring, tropospheric ozone depletion is related to the presence of halogen oxide concentrations in the atmospheric boundary layer. Halogen oxides such as BrO participate in an autocatalytic chemical reaction cycle, leading to the release of Br2 and BrCl from the fresh sea ice. The paper presents the identification of a detailed chemical reaction mechanism for the ozone depletion event, where bromine plays the major role. The heterogeneous reactions in the chemical reaction mechanism are studied in detail, and a sensitivity analysis is performed to identify the importance of each reaction in the mechanism. A skeletal reaction scheme is identified on the basis of the sensitivity analysis,. This skeletal chemical reaction mechanism then is used in a 3-D large eddy simulation (LES) with the Smagorinsky sub-grid model. The configuration studied includes a mountain located at the ground above which the ozone depletion is studied. In this situation, the height of the boundary layer varies, which greatly affects the ozone depletion event.

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8

"CLOSURE IN ARTIFICIAL CELL SIGNALLING NETWORKS - Investigating the Emergence of Cognition in Collectively Autocatalytic Reaction Networks." In International Conference on Bio-inspired Systems and Signal Processing. SciTePress - Science and and Technology Publications, 2009. http://dx.doi.org/10.5220/0001545301070114.

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Sun, Liangfeng, Arthur M. Sterling, Su-Seng Pang, Ioan I. Negulescu, and Michael A. Stubblefield. "Thermal Analysis of Curing Process of Epoxy Prepreg." In ASME 2001 Engineering Technology Conference on Energy. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/etce2001-17025.

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Abstract The curing process of epoxy prepreg was studied by means of Differential Scanning Calorimeter. The dynamic, isothermal, and combinations of dynamic and isothermal measurements were done over selected temperature ranges and isothermal cure temperatures. The heats of reaction for dynamic and isothermal cure were determined. The results show that the heat of isothermal-cure reaction increased with the increment of temperature. The degree of cure was calculated from the heat of isothermal-cure reaction. The complete cure reaction could be achieved at 220 °C within the very short cure time. The changes of cure rate with time were given for the studied isothermal cure temperatures. To simulate the relationship between the cure rate and degree of cure, the autocatalytic model was used and the four parameters were calculated. Except in the late stage of cure reaction, the model agrees well with the experimental data, especially at high temperatures. To account for the effect of diffusion on the cure rate, a diffusion factor was introduced into the model. The modified model greatly improved the predicated data at the late stage of cure reaction.

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Tans, G., J. Rosing, M. Berrettini, B. Lammle, and J. H. Griffin. "AUTOACTIVATION OF HUMAN PLASMA PREKALLIKREIN." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1642898.

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Incubation of purified human plasma prekallikrein with sulfatides or dextran sulfate resulted in spontaneous activation of prekallikrein as judged by the appearance of amidolytic activity towards the chromogenic substrate H-D-pro-phe-arg-p-nitroanilide (S 2302). The time course of generation of amidolytic activity was sigmoidal with an apparent lag phase followed by a rapid activation until finally a plateau was reached. Soybean trypsin inhibitor completely blocked prekallikrein activation whereas corn, limabean and ovomucoid trypsin inhibitor did not. The Ki of the reversible inhibitor, benzamidine, for autoactivation (240 uM) was identical to the Ki of benzamidine for kallikrein. Thus, spontaneous prekallikrein activation and kallikrein showed the same specificity for a number of serine protease inhibitors, indicating that prekallikrein is activated by its own enzymatically active form, kallikrein. Immunoblotting analysis showed that, concomitant with the appearance of amidolytic activity, prekallikrein was cleaved. However, prekallikrein was not quantitatively converted into two-chain kallikrein since other polypeptide products were visible on the gels. This accounts for the observation that in amidolytic assays not all prekallikrein present in the reaction mixture was measured as active kallikrein. Kinetic analysis showed that prekallikrein activation can be described by a second-order reaction mechanism in which prekallikrein is activated kallikrein. The apparent second order rate constant was 27000 M-ls-1 (pH 7.2, 50 uM sulfatides, ionic strength 1=0.06, at 37°C). Autocatalytic prekallikrein activation was strongly dependent on the ionic strength, since there was a considerable decrease in the rate of the reaction at high salt concentrations. Our data support a prekallikrein autoactivation mechanism in which surface-bound kallikrein activates surface-bound prekallikrein. The rate constant of autoactivation is considerably lower than the rate constants reported for Factor Xlla dependent prekallikrein formation. Autocatalytic prekallikrein activation may, however, contribute to kallikrein formation during the initiating phase of contact activation.

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Reports on the topic "Autocatalytic reaction"

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Hallman, D. F. Input to Resin Column Structural Analysis if Autocatalytic Resin Reaction Occurs in HB-Line Phase II. Office of Scientific and Technical Information (OSTI), July 2001. http://dx.doi.org/10.2172/783009.

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Wang, Chi-Jen. Analysis of discrete reaction-diffusion equations for autocatalysis and continuum diffusion equations for transport. Office of Scientific and Technical Information (OSTI), January 2013. http://dx.doi.org/10.2172/1226552.

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