Relevant bibliographies by topics / Haldane model

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Haldane model'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Haldane model"

1

Sacramento, P. D., and V. R. Vieira. "Haldane gap in the S = 1 Haldane-Shastry model." Zeitschrift für Physik B Condensed Matter 103, no. 2 (1996): 231–33. http://dx.doi.org/10.1007/s002570050365.

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Leonforte, Luca, Davide Valenti, Bernardo Spagnolo, Alexander A. Dubkov, and Angelo Carollo. "Haldane model at finite temperature." Journal of Statistical Mechanics: Theory and Experiment 2019, no. 9 (2019): 094001. http://dx.doi.org/10.1088/1742-5468/ab33f8.

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Iguchi, Kazumoto. "Generalization of Tomonaga–Luttinger Liquids and the Calogero–Sutherland Model: Microscopic Models for the Haldane Liquids." Modern Physics Letters B 12, no. 16 (1998): 607–14. http://dx.doi.org/10.1142/s0217984998000718.

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We discuss the quantum many-body system interacting with a separately symmetric two-body potential in higher dimensions as a generalization of the Calogero–Sutherland model in one dimension. This system exhibits the properties of a Haldane liquid such as Haldane–Wu (i.e., fractional exclusion) statistics, broken particle–hole symmetry and the existence of pseudo-Fermi surface as a generalization of the cencept of Tomonaga–Luttinger liquids in one dimension.
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Beltrán-Prieto, Juan Carlos, and Long Huynh Bach Son Nguyen. "Integration of yield factor expression into Haldane’s model for substrate inhibition." MATEC Web of Conferences 210 (2018): 04044. http://dx.doi.org/10.1051/matecconf/201821004044.

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Haldane equation is a mathematical expression that has been widely used in growth kinetics to give a proper fit to experimental data in case of substrate inhibition during enzymatic processes. It determines the specific growth rate of a microorganism based on the substrate concentration, the half saturation constant, the inhibitory constant and the maximum growth rate achievable. However, for practical and experimental design purposes it is important to describe Haldane equation in terms of the initial concentration of substrate, since this information is required to know the proper amount of initial substrate to be used. For this reason, in the present paper we proposed to integrate the expression of yield factor and the definition of specific growth rate in a batch system into Haldane’s equation and to solve analytically the mathematical equations in order to obtain a final expression that correlates the maximum growth rate, the limiting nutrient concentration at which the specific growth is half its maximum value, the inhibitory constant, the initial concentration of substrate and the initial amount of biomass required in time. Accordingly, simulation and numerical studies are presented to analyze and discuss the importance of the obtained model.
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Zhang, Jian, Ling Feng Qiu, and Yi Ming Chen. "Study on Substrate Inhibition Kinetics in Anammox-UASB Reactor." Applied Mechanics and Materials 316-317 (April 2013): 567–70. http://dx.doi.org/10.4028/www.scientific.net/amm.316-317.567.

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The study on substrate inhibition kinetics in Anammox-UASB reactor was carried out treating low C/N wastewater. Haldane model was researched through non-linear fitting to represent the inhibition caused by nitrite. The results showed that Haldane model was suitable for fitting dynamics model. In Haldane model, rmax was 1.15 kg/( m3•d), KS=9.31 mg/L, KIH=476 mg/L. On condition that the concentration of nitrite was 66.57 mg/L, substrate conversion rate reached the highest value which was 0.90 kg/(m3•d) actually. And it was 78.1% of the highest value in theory.
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Ghalamkari, Kazu, Yuki Tatsumi, and Riichiro Saito. "Perfect Circular Dichroism in the Haldane Model." Journal of the Physical Society of Japan 87, no. 6 (2018): 063708. http://dx.doi.org/10.7566/jpsj.87.063708.

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7

Jolicur, Th, та O. Golinelli. "σ-model study of Haldane-gap antiferromagnets". Physical Review B 50, № 13 (1994): 9265–73. http://dx.doi.org/10.1103/physrevb.50.9265.

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8

Wang, Zhou-Fei, Mo-Lin Ge, and Kang Xue. "The Haldane - Shastry model and RTT relations." Journal of Physics A: Mathematical and General 30, no. 14 (1997): 5023–36. http://dx.doi.org/10.1088/0305-4470/30/14/014.

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9

Wierschem, Keola, and Pinaki Sengupta. "Characterizing the Haldane phase in quasi-one-dimensional spin-1 Heisenberg antiferromagnets." Modern Physics Letters B 28, no. 32 (2014): 1430017. http://dx.doi.org/10.1142/s0217984914300178.

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We review the basic properties of the Haldane phase in spin-1 Heisenberg antiferromagnetic chains, including its persistence in quasi-one-dimensional (Q1D) geometries. Using large-scale numerical simulations, we map out the phase diagram for a realistic model applicable to experimental Haldane compounds. We also investigate the effect of different chain coupling geometries and confirm a general mean-field universality of the critical coupling times the coordination number of the lattice. Inspired by recent developments in the characterization of symmetry protected topological (SPT) states, of which the Haldane phase of the spin-1 Heisenberg antiferromagnetic chain is a preeminent example, we provide direct evidence that the Q1D Haldane phase is indeed a nontrivial SPT state.
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HUANG, HAI. "FIELD-THEORETICAL CALCULATIONS ON THE HALDANE GAP OF QUASI-ONE-DIMENSIONAL HEISENBERG ANTIFERROMAGNETS." International Journal of Modern Physics B 23, no. 31 (2009): 5789–800. http://dx.doi.org/10.1142/s0217979209053898.

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One-dimensional Heisenberg antiferromagnets can be described by the O (3) nonlinear σ-model (NLσM). We give a review on zero temperature and finite temperature Haldane gaps obtained from this model. Based on the coupled-chain theory, we derive the finite temperature Haldane gap for triangular antiferromagnet RbNiCl 3. The Néel temperature is obtained as 11 K. In order to treat the anisotropy in crystal Ni ( C 2 H 8 N 2)2 NO 2( ClO 4), we relax the constraint of the NLσM and compute the finite temperature Haldane gap using a Ginzburg–Landau mean field approach. The comparison with the experimental data is discussed.
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Dissertations / Theses on the topic "Haldane model"

1

Gurrieri, Maria Vittoria. "Twisted bilayer graphene: effective model, topological states and relevant symmetries." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23177/.

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Correlated Mott-insulating states alternated with unconventional superconductivity have been lately observed in magic-angle graphene superlattices. For small angles of rotation the band structure of twisted bilayer graphene (TBG) exhibits isolated nearly flat bands, which are responsible for such correlated behaviour. At first, we describe TBG effective model in order to construct a topological phase diagram for the mini-bands near charge neutrality. Then, through symmetry analysis, we try to unravel and understand the limit of such model, when one tries to revert back to localised low-energy orbitals in real space (Wannier functions) for Hubbard-like descriptions.
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Antini, Alessandro. "Non-local order parameters in one-dimensional spin systems." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18043/.

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Per molti anni si è creduto che la teoria di Landau sulla rottura spontanea di simmetria esaurisse la descrizione di tutte le fasi in cui è possibile osservare la materia. Ogni transizione di fase si riteneva dunque dover essere sempre accompagnata da un cambiamento della simmetria del sistema. È da diversi decenni ormai che però siamo consapevoli dell'esistenza di fasi della materia distinte che posseggono esattamente la stessa simmetria. A queste fasi è stato dato il nome di fasi topologiche, e chiaramente non possono essere descritte e previste dalla teoria di Landau. In sistemi unidimensionali è possibile osservare fasi topologicamente non banali in presenza di alcune simmetrie. L'esempio più importante in questo contesto è fornito dalla fase in cui si trova la catena di Heisenberg di spin 1 antiferromagnetica, la cosiddetta fase di Haldane. Essa risulta una dei primi esempi di fase topologica, e presenta già diverse caratteristiche proprie di queste fasi, come la presenza di stati di bordo e di ordini di stringa nascosti. Infatti una delle peculiarità delle fasi topologiche è quella di essere rilevate da parametri d'ordine non locali, che a differenza dai comuni parametri d'ordine che caratterizzano le diverse fasi associate a rotture spontanee di simmetria, sono forniti da valori di aspettazione di operatori non locali. In questa tesi vengono introdotti nuovi parametri d'ordine non locali, diversi rispetto a quelli comunemente utilizzati, ma ugualmente efficaci nella rilevazione delle diverse fasi massive in cui è possibile trovare il nostro modello di spin 1 di riferimento, ovvero il cosiddetto modello bilineare-biquadratico. Questi parametri d'ordine non locali sono stati valutati sia numericamente che analiticamente laddove fosse disponibile una rappresentazione esatta dello stato fondamentale del sistema.
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Hilgenböcker, Kirsten. "Wolbachia's role in classical speciation theory." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2009. http://dx.doi.org/10.18452/16020.

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Wolbachien sind intrazeklluläre Bakterien die zahlreiche Arthropodenarten infizieren. Sie induzieren häufig eine zytoplasmatische Paarungsinkompatibilität die postzygotische Isolation zwischen unterschiedlich infizierten Individuen der gleichen Wirtsart verursacht, weswegen Wolbachien Beachtung als mögliche Katalysatoren von Artbildungsprozessen gefunden haben. Vorherige Arbeiten zur Artbildung untersuchten meist entweder Wolbachia-induzierte oder die klassischen, genetischen postzygotischen Isolationsmechanismen. Normalerweise sollte es aber der Fall sein dass beide Mechanism gleichzeitig auftreten. In dieser Arbeit führen wir Untersuchungen zur Rolle der Wolbachien in der Artbildung fort indem wir die Interaktionen von Wolbachia-induzierten und genetischen Inkompatibilitäten analysieren. Wir werden zeigen dass Wolbachien einen starken Einfluss auf genetisch-basierte Artbildungsprozesse haben. Insbesondere können sich die Mechanism bei gleichzeitigem Auftreten katalysieren. Außerdem werden wir zeigen dass Wolbachia Artbildungsprozesse unter allgemeineren Bedingungen beeinflussen kann als vorherige Studien suggerierten. Da die Rolle der Wolbachien in der Artbildung stark von deren Verbreitung abhängt, werden wir desweiteren eine statistische Metaanalyse von bestehenden Daten zu Infektionsfrequenzen präsentieren. Aufgrund der Methoden der Datenerhebung ist es sehr wahrscheinlich, dass der wirkliche Anteil der infizierten Arten mit 20% deutlich unterschätzt wird. Unsere Analyse bestätigt dies und zeigt dass viel wahrscheinlicher circa zwei Drittel aller Arten infiziert sind. Unsere Resultate der klassischen Artbildungstheorie kombiniert mit denen der statistischen Analyse zu Infektionsfrequenzen von Wolbachia implizieren dass Wolbachien als allgemeine Faktoren in der Evolution von Arthropoden anzusehen sind.<br>Wolbachia are intracellular bacteria that commonly infect arthropod species. Since they often induce a cytoplasmic mating incompatibility (CI) in their hosts that acts as a postzygotic isolating mechanism between differently infected individuals of one species, Wolbachia have received attention as a potential promoter of arthropod speciation processes. Previous studies on speciation focused on either Wolbachia-induced or the classical nuclear-based postzygotic isolating mechanism. However, it should usually be the case that both co-occur. This thesis continues investigations on Wolbachia''s role in speciation by analyzing interactions of Wolbachia-induced CI and nuclear incompatibility (NI) caused by genetic differentiation. We will show that Wolbachia have strong impact on nuclear-based speciation processes. In particular, synergy effects can occur when both isolating mechanisms act simultaneously. Furthermore, we show that Wolbachia can influence speciation processes under more general conditions than previous studies on Wolbachia''s role in speciation suggested. Since the actual role of Wolbachia in arthropod speciation will strongly depend on their abundance, we present a statistical meta-analysis of published data on Wolbachia infection frequencies. Due to the sampling methods applied in studies on Wolbachia infection frequencies, it is likely that current estimates of 20% infected species are underestimates. This is supported by our analysis and we show that more likely about two-thirds of species are infected. Combining both results, this thesis provides strong evidence for Wolbachia being a very general factor in arthropod speciation processes.
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Dunger, Volkmar. "Entwicklung und Anwendung des Modells BOWAHALD zur Quantifizierung des Wasserhaushaltes oberflaechengesicherter Deponien und Halden." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek &quot;Georgius Agricola&quot, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:105-112166.

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In der Habilitationsschrift sind die Ergebnisse einer über 20-jährigen Entwicklungstätigkeit zusammengefasst, die zum Deponie- und Haldenwasserhaushaltmodell BOWAHALD geführt haben. Beim Modell BOWAHALD handelt es sich um ein anwendungsorientiertes Mehrschichtenboxmodell, das die wesentlichen in Oberflächensicherungen ablaufenden hydrologischen Prozesse quantifiziert. Die Hauptanwendungsbereiche des Modells BOWAHALD sind Wasserhaushaltsuntersuchungen zum Istzustand einer Halde bzw. Deponie, Planungsszenarien in Bezug auf die wasserhaushaltliche Optimierung einer Oberflächensicherung, Sickerwasserprognosen von Halden-/Deponieflaechen, Beurteilung der Chancen für eine ausreichende Vegetationsentwicklung sowie eine qualitative Einschätzung der Langzeitbeständigkeit vorhandener bzw. zu planender Sicherungsmaßnahmen. Mit dem Modell BOWAHALD liegt ein hierfür praktikables Instrumentarium vor, das den Nutzer in die Lage versetzt, mit vertretbarem Aufwand bezüglich Daten- und Parameterhandling anwendungsorientierte Lösungen zu erarbeiten. Zahlreiche Modellanwendungen für die verschiedensten wasserhaushaltlichen Problemstellungen, die mit Oberflächensicherungen im Zusammenhang stehen, belegen dies und sind mit Sicherheit ein wesentlicher Grund dafür, dass das Modell BOWAHALD insbesondere in Sachsen eine weite Verbreitung und Anerkennung gefunden hat.
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5

Liu, Kuan-ting, and 劉冠廷. "Topological phase transition in Haldane-Zeeman model." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/13619814397866415067.

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碩士<br>國立中山大學<br>物理學系研究所<br>104<br>In this thesis, we study various topological phase transitions in the 2D Haldane-Zeeman model on the honeycomb lattice and unvail the universality class of the critical behavior for the transition we focus on. By tuning the strength of the Haldane term (locally breaking time reversal symmetry but keeping total magnetic flux zero) or Zeeman term in the model, a topological phase transition could occur. In addition, by tuning density of the particle (Fermi level) or adding external magnetic field, a phase transition could also occur. We classify different kinds of quantum ground states, either topologically trivial or nontrivial, by calculating the Chern number for each state in the system. As a result, we obtain the phase diagram of the model as a function of chosen parameters. Furthermore, in the low-energy limit we find that the system at half-filling can be approximately described by the Dirac equation, just like that in graphene while with a mass term here. By using this description, we map our model onto the so-called Chalker-Coddington network model in order to study the criticality of a certain topological phase transition in the model in the presence of disorder. Explicitly, we start by considering a phase with Chern number 2 (in the absence of the Zeeman term, and it exhibits quantum anomalous Hall effect) and take into account random scatterings due to disorder and possible spin-flip effect in the tunneling processes. We then employ the network model to obtain the localization length of the wave function after finite-size scaling as a function of the transmission parameter around the critical point. Eventually, the numerically extracted critical exponent ν≈2.7. This result is similar to what people find in the integer quantum Hall plateau transition. Therefore, we conclude that the critical behavior of this quantum anomalous Hall effect and integer quantum Hall effect should belong to the same universality class, i.e., a unitary class.
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Kurdestany, Jamshid Moradi. "Phases, Transitions, Patterns, And Excitations In Generalized Bose-Hubbard Models." Thesis, 2013. http://hdl.handle.net/2005/2563.

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This thesis covers most of my work in the field of ultracold atoms loaded in optical lattices. This thesis can be divided into five different parts. In Chapter 1, after a brief introduction to the field of optical lattices I review the fundamental aspects pertaining to the physics of systems in periodic potentials and a short overview of the experiments on ultracold atoms in an optical lattice. In Chapter 2 we develop an inhomogeneous mean-field theory for the extended Bose-Hubbard model with a quadratic, confining potential. In the absence of this poten¬tial, our mean-field theory yields the phase diagram of the homogeneous extended Bose-Hubbard model. This phase diagram shows a superfluid (SF) phase and lobes of Mott-insulator(MI), density-wave(DW), and supersolid (SS) phases in the plane of the chemical potential and on-site repulsion ; we present phase diagrams for representative values of , the repulsive energy for bosons on nearest-neighbor sites. We demonstrate that, when the confining potential is present, superfluid and density-wave order parameters are nonuniform; in particular, we obtain, for a few representative values of parameters, spherical shells of SF, MI ,DW ,and SSphases. We explore the implications of our study for experiments on cold-atom dipolar con¬densates in optical lattices in a confining potential. In Chapter3 we present an extensive study of Mottinsulator( MI) and superfluid (SF) shells in Bose-Hubbard (BH) models for bosons in optical lattices with har¬monic traps. For this we develop an inhomogeneous mean-field theory. Our results for the BH model with one type of spinless bosons agrees quantitatively with quan¬tum Monte Carlo(QMC) simulations. Our approach is numerically less intensive than such simulations, so we are able to perform calculations on experimentally realistic, large three-dimensional(3D) systems, explore a wide range of parameter values, and make direct contact with a variety of experimental measurements. We also generalize our inhomogeneous mean-field theory to study BH models with har¬monic traps and(a) two species of bosons or(b) spin-1bosons. With two species of bosons we obtain rich phase diagrams with a variety of SF and MI phases and as¬sociated shells, when we include a quadratic confining potential. For the spin-1BH model we show, in a representative case, that the system can display alternating shells of polar SF and MI phases; and we make interesting predictions for experi¬ments in such systems. . In Chapter 4 we carry out an extensive study of the phase diagrams of the ex-tended Bose Hubbard model, with a mean filling of one boson per site, in one dimension by using the density matrix renormalization group and show that it contains Superfluid (SF), Mott-insulator (MI), density-wave (DW) and Haldane ¬insulator(HI) phases. We show that the critical exponents and central charge for the HI-DW,MI-HI and SF-MI transitions are consistent with those for models in the two-dimensional Ising, Gaussian, and Berezinskii-Kosterlitz-Thouless (BKT) uni¬versality classes, respectively; and we suggest that the SF-HI transition may be more exotic than a simple BKT transition. We show explicitly that different bound¬ary conditions lead to different phase diagrams.. In Chapter 5 we obtain the excitation spectra of the following three generalized of Bose-Hubbard(BH) models:(1) a two-species generalization of the spinless BH model, (2) a single-species, spin-1 BH model, and (3) the extended Bose-Hubbard model (EBH) for spinless interacting bosons of one species. In all the phases of these models we show how to obtain excitation spectra by using the random phase approximation (RPA). We compare the results of our work with earlier studies of related models and discuss implications for experiments.
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Dunger, Volkmar. "Entwicklung und Anwendung des Modells BOWAHALD zur Quantifizierung des Wasserhaushaltes oberflaechengesicherter Deponien und Halden." Doctoral thesis, 2006. https://tubaf.qucosa.de/id/qucosa%3A22590.

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In der Habilitationsschrift sind die Ergebnisse einer über 20-jährigen Entwicklungstätigkeit zusammengefasst, die zum Deponie- und Haldenwasserhaushaltmodell BOWAHALD geführt haben. Beim Modell BOWAHALD handelt es sich um ein anwendungsorientiertes Mehrschichtenboxmodell, das die wesentlichen in Oberflächensicherungen ablaufenden hydrologischen Prozesse quantifiziert. Die Hauptanwendungsbereiche des Modells BOWAHALD sind Wasserhaushaltsuntersuchungen zum Istzustand einer Halde bzw. Deponie, Planungsszenarien in Bezug auf die wasserhaushaltliche Optimierung einer Oberflächensicherung, Sickerwasserprognosen von Halden-/Deponieflaechen, Beurteilung der Chancen für eine ausreichende Vegetationsentwicklung sowie eine qualitative Einschätzung der Langzeitbeständigkeit vorhandener bzw. zu planender Sicherungsmaßnahmen. Mit dem Modell BOWAHALD liegt ein hierfür praktikables Instrumentarium vor, das den Nutzer in die Lage versetzt, mit vertretbarem Aufwand bezüglich Daten- und Parameterhandling anwendungsorientierte Lösungen zu erarbeiten. Zahlreiche Modellanwendungen für die verschiedensten wasserhaushaltlichen Problemstellungen, die mit Oberflächensicherungen im Zusammenhang stehen, belegen dies und sind mit Sicherheit ein wesentlicher Grund dafür, dass das Modell BOWAHALD insbesondere in Sachsen eine weite Verbreitung und Anerkennung gefunden hat.
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Books on the topic "Haldane model"

1

Chung, H. M. Irradiation-assisted stress corrosion cracking of model austenitic stainless steels irradiated in the Halden reactor. Division of Engineering Technology, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1999.

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Chung, H. M. Irradiation-assisted stress corrosion cracking of model austenitic stainless steels irradiated in the Halden reactor. Division of Engineering Technology, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1999.

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Chung, H. M. Irradiation-assisted stress corrosion cracking of model austenitic stainless steels irradiated in the Halden reactor. Division of Engineering Technology, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1999.

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Book chapters on the topic "Haldane model"

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Greiter, Martin. "From a Laughlin State to the Haldane–Shastry Model." In Springer Tracts in Modern Physics. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24384-4_3.

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Mertzlufft, Fritz, and Ludwig Brandt. "Hyperoxic Intubation Apnoea: An In Vivo Model for the Proof of the Christiansen-Douglas-Haldane Effect." In Oxygen Transport to Tissue XI. Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-5643-1_44.

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Affleck, Ian, and Elliott H. Lieb. "A Proof of Part of Haldane’s Conjecture on Spin Chains." In Condensed Matter Physics and Exactly Soluble Models. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-06390-3_17.

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"Haldane gap." In Exactly Solvable Models in Many-Body Theory. WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813140158_0018.

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Saunders, Max. "‘A Scientific Age’." In Imagined Futures. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198829454.003.0002.

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This chapter focuses on the volumes on science. An introductory discussion of popular science writing leads to more detailed analyses of Haldane’s and Bernal’s key volumes. Their projection of biotechnological and bionic interventions in the human are examined as pioneers of trans-humanism. Their imaginative audacity is contrasted with the bland norms of contemporary futurology. They are seen as representative of the series in several ways: for their radical intellectual approach; their placing of science in relation to the arts and humanities; their commitment to public debate and education; their concerns with language and communication; and with psychology. The section concludes by establishing an essentially scientific paradigm (derived from Haldane and Bernal) for the whole series, arguing that this paradigm represents a transformation by science and technology of every aspect of life, from our experience of change, to a sense of agency, our politics, modes of thinking and feeling, and our ways of thinking about and expressing our imaginations of the future.
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Marshall, James A. R. "What Is Fitness?" In Social Evolution and Inclusive Fitness Theory. Princeton University Press, 2015. http://dx.doi.org/10.23943/princeton/9780691161563.003.0009.

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This chapter considers the problem of correctly defining fitness costs and benefits in inclusive fitness theory, when competition occurs between offspring who are relatives. It reviews the definition of evolutionary fitness and shows how its misinterpretation explains many previous misunderstandings as to whether inclusive fitness theory always makes accurate predictions. The chapter begins with a discussion of Haldane's dilemma, which can be formalized with fitness equations that show that the risk of death can make fitness effects all-or-nothing. It then examines how inclusive fitness models can be constructed to deal with reproductive value and class-structured populations. It also shows how costs and benefits can be expressed as payoffs that are proportional to reproductive success, as changes in production of offspring, or as changes in evolutionary fitness. Finally, it presents examples that illustrate when fitness, payoffs, and fecundity are different, and how inclusive fitness analyses can be performed properly in such situations.
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Eldredge, Niles. "Systematics, Paleontology, and the Modern Synthesis." In Unfinished Synthesis. Oxford University Press, 1986. http://dx.doi.org/10.1093/oso/9780195036336.003.0006.

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Ernst Mayr, a systematist and founding father of the synthetic theory, has recently (Mayr 1980b) assessed the role played by the field of systematics in general in the emergence of the synthesis. Mayr (1980a, 1980b; 1982, chapter 12) actively opposes the conventional supposition that the synthesis is the product of three phases of development: (1) resolution of early difficulties raised in the early days of genetics, largely through the work of Fisher, Haldane, and Wright; (2) the publication of Dobzhansky’s Genetics and the Origin of Species (1937a), which fused concepts of the genetics of populations with the mainstream of Darwinian thought; and (3) the demonstration by systematists (e.g., Mayr 1942), paleontologists (e.g., Simpson 1944), and practitioners of various other biological disciplines that the data of their respective fields are consistent with genetic principles. (See, for example, Shapere 1980, p. 398, for such a view of the historical development of the synthesis.) It is Mayr’s view (e.g., 1980a, 1980b) that these various nongenetics disciplines played a more vital, vigorous and active role than such “me-too-ism” implied by phase 3 above in the conventional view. There is, no doubt, something to be said for this claim, though the historical question per se is not germane to the present inquiry. But Mayr’s (1980b, pp. 127 ff) list of the contributions he feels systematists made directly to the new synthesis is relevant as it suggests a guide to our understanding of Mayr’s own important contribution—Systematics and the Origin of Species (1942, reprinted in 1982). Mayr lists the following contributions of systematics to the emerging synthesis: (1) “population thinking,” (2) “the immense variability of populations,” (3) “the gradualness of evolution,” (4) “the genetic nature of gradual evolution,” (5) “geographic speciation,” (6) “the adaptive nature of observed variation,” (7) “belief in the importance of natural selection,” and (8) the notion (shared with paleontologists) that “macroevolutionary phenomena” are interpretable in terms of “gradual evolution” (i.e., as opposed to saltational models—Mayr 1980b, p. 134). All these topics, and more, are well developed in the pages of Mayr’s Systematics and the Origin of Species.
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Conference papers on the topic "Haldane model"

1

Bayen, Terence, and Jerome Harmand. "Minimal time problem for a chemostat model with growth rate of Haldane type." In 2014 European Control Conference (ECC). IEEE, 2014. http://dx.doi.org/10.1109/ecc.2014.6862401.

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Lannebère, Sylvain, and Mário G. Silveirinha. "Photonic analogues of the Haldane and Kane-Mele models." In Metamaterials, edited by Vladimír Kuzmiak, Peter Markos, and Tomasz Szoplik. SPIE, 2019. http://dx.doi.org/10.1117/12.2525093.

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Kapadia, A., N. Nath, T. C. Burg, and D. M. Dawson. "Lyapunov-based continuous-stirred tank bioreactor control to maximize biomass production using the haldane and monod specific growth models." In 2010 American Control Conference (ACC 2010). IEEE, 2010. http://dx.doi.org/10.1109/acc.2010.5531387.

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Scolaro, Alessandro, Ivor Clifford, Carlo Fiorina, and Andreas Pautz. "First Steps Towards the Development of a 3D Nuclear Fuel Behavior Solver With OpenFOAM." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-82381.

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A new 3D fuel behavior solver is currently under collaborative development at the Laboratory for Reactor Physics and Systems Behaviour of the École Polytechnique Fédérale de Lausanne and at the Paul Scherrer Institut. The long term objective is to enable a more accurate simulation of inherently 3D safety-relevant phenomena which affect the performance of the nuclear fuel. The current implementation is a coupled three-dimensional heat conduction and linear elastic small strain solver, which models the effects of burnup- and temperature dependent material properties, swelling, relocation and gap conductance. The near future developments will include the introduction of a smeared pellet cracking model and of material inleasticities, such as creep and plasticity. After an overview of the theoretical background, equations and models behind the solver, this work focuses on the recent preliminary verification and validation efforts. The radial temperature and stress profiles predicted by the solver for the case of an infinitely long rod are compared against their analytical solution, allowing the verification of the thermo-mechanics equations and of the gap heat transfer model. Then, an axisymmetric model is created for 4 rods belonging to the Halden assembly IFA-432. These models are used to predict the fuel centerline temperature during power ramps recorded at the beginning of life, when the fuel rod performance is still not affected by more complex high burnup effects. Finally, the predictions are compared with the experimental measurements coming from the IFPE database. This first preliminary results allow a careful validation of the temperature-dependent material properties and of the gap conductance models.
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Pekkarinen, Esko. "Comparison of Plant Response of Forsmark 3 Nuclear Power Plant to Forsmark 1 Type of Transient (25th July 2006), Using the HAMBO BWR Simulator: Thermal-Hydraulic Aspects." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48143.

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Modernisation of control rooms of the nuclear power plants has been a major issue during the last few years. With this as a basis, the BWR plants in Sweden and Finland funded, in co-operation with the Halden Project, an experimental HAMBO BWR simulator project based on the Forsmark 3 plant in Sweden. VTT Energy in Finland developed the simulator models for HAMBO with the aid of their APROS tool, while the operator interface was developed by the Halden Project. The simulator and its performance have been described in other publications [1, 2]. On July 25th 2006 there was a short circuit at Forsmark 1 nuclear power plant when manoeuvring equipment in the 400kV-switch yard. Due to the short circuit, the plant suffered an electrical disturbance that led to scram and failure of two out of four diesel generators. The purpose of the study carried out at VTT in 2007 was to assess the capabilities of the HAMBO BWR simulator to handle Forsmark 1 type of events in different nuclear power plants (Forsmark 3 in this case). The Forsmark 1 incident showed (among other things) that the intention to protect certain components (in this case the UPS-system) can in certain situations affect negatively to the safety functions. It is concluded that most of this type of BWR transients may be simulated to a certain extent using the existing HAMBO- and APROS- models. A detailed modelling of the automation and electric systems is required sometimes if the complex interplay between these systems and the process is to be predicted reliably. The modelling should be plant specific and level of detail should be assessed case-by-case (i.e. what kind of transient is in question, what systems are available, what is the main purpose of the analyses etc.). The thermal-hydraulic models of the APROS-code seem to replicate well the real behaviour of thermal-hydraulic process provided that there is enough information about the transient in consideration.
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Gomes, Daniel de Souza, and Antonio Teixeira e. Silva. "Uncertainty Evaluation and Sensitivity Analysis Under Accident Scenarios." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81020.

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Nuclear power units need to operate conditioned the lowest risk possible. Safety analysis must use paired models, combining probabilistic and deterministic methods. In this study, FRAPCON and FRAPTRAN codes were used to simulate an idealized test based on IFA-650 series, carried out within Halden program. Nuclear systems work to depend on uncertainty values that must be quantified and propagated. The sources of uncertainties can be divided among physical models, boundary conditions, and mechanical tolerances. Eight physical models that can be configured, such as thermal conductibility, and fission gas release. Mechanical tolerances introduced by fuel fabrication are deviations that must propagate throughout of the system. To measure the effects produced by uncertainties were used correlation coefficients between entry and exit. Uncertainties contained on input values are spread to measure the impact created on safety limits. The method adopted used 96 samples to achieve the 95% of probability and 95% of confidence level.
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Ma, Zehua, Koroush Shirvan, Wei Li, and Yingwei Wu. "Modeling Axial Relocation of Fragmented Fuel During Loss of Coolant Conditions by Using ABAQUS." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16291.

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Abstract In a light-water reactor, during normal operating condition, the UO2 nuclear fuel pellets undergo fragmentation primarily due to presence of thermal stresses, fission gas development and pellet-clad mechanical interaction. Under Loss of Coolant Accident (LOCA) conditions, a portion of fuel fragments can freely move downwards to the ballooning region due to the significant cladding deformation. The fuel relocation can localize the heat load and in turn accelerate the cladding balloon and burst process. Cladding burst is of great concern because of the potential for fuel dispersal into coolant and clad structural stability. In our work, we built up a finite element model considering cladding balloon, fuel relocation and its resultant thermal feedback during LOCA condition with ABAQUS. The clad balloon model includes phase transformation, swelling, thermal and irradiation creep, irradiation hardening and annealing and other important thermal-mechanical properties. The mass of relocation model was verified against the analytical cases of single balloon and twin balloons. The cladding balloon model combined with fuel thermal conductivity degradation was verified against fuel performance code, FRAPTRAN. Finally, with the evolution of pellet-cladding gap, the fuel mass relocation was calculated and compared against the IFA-650.4 transient test from the Halden reactor.
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Sanders, J., J. Pomerville, and Paul D. Moskowitz. "Arctic Military Environmental Cooperation Project 1.5-1 Radiation Control at Facilities: Application of the PICASSO System." In ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4999.

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The Arctic Military Environmental Cooperation (AMEC) is a cooperative effort between military establishments of the Russian Federation, United States, and Norway to reduce potential environmental threats from military installations and activities in the Arctic region and enhancing the environmental security of all three countries. The goal of this project is to enhance the ability of the Russian Navy to effectively and safely perform radioecological monitoring of sites at facilities dismantling nuclear submarines and handling and disposition of spent nuclear fuel (SNF) and the radioactive waste by-products. Radioecological monitoring is needed to protect workers at the sites engaged in work involving the dismantlement of nuclear submarines, the local public of the surrounding communities, and the environment. Radioecological monitoring is being accomplished by the installation of a centralized radiological surveillance system, the PICASSO Environmental Monitoring system developed by the Institute for Energy Technology, Halden, Norway. The Russian Institute for Nuclear Safety, Moscow, Russia, modified the system for use at Russian Federation Naval bases and developed a working model for its intended application. The working model includes Russian manufactured terrestrial and underwater gamma detectors, smart controllers, radiomodems for off-site transmission of data coupled with the PICASSO Environmental Monitoring system installed into local computers, work stations, and a centralized server to monitor the real-time activity of the particular site. The selected sites for installation of PICASSO are the Polyarninsky Shipyard No. 10 and the RTP Atomflot shipyards. The AMEC project teams visited Polyarninsky Shipyard No. 10 and the RTP Atomflot shipyards in June 2003 to monitor the progress of the installation of the detection and monitoring systems. The implementation of the PICASSO system will be integrated with other AMEC projects at both sites. Plans are being developed to implement the use of this system at most Russian Federation Naval sites handling SNF.
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He, Yanan, Yingwei Wu, Shihuai Wang, Bowen Qiu, and G. H. Su. "Analysis of UO2-BeO Fuel Performance During Normal Conditions and RIA." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-82076.

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UO2-BeO composite fuel may enable Light Water Reactors (LWRs) to have better safety due to its higher thermal conductivity. Much work have been done on the analysis of UO2-BeO fuel performance during LWRs steady state and Loss of Coolant Accident (LOCA) conditions using hypothetical thermal properties and behaviors models, leading to much uncertainty of the results. In this paper, firstly, fuel swelling and densification models for UO2-BeO fuel were developed based on Halden experiment data. Secondly, UO2-BeO fuel thermal properties and behaviors models have been coded in FRAPCON4.0 and FRAPTRAN2.0 after an evaluation of their applicability to UO2-BeO performance simulation. Then, both UO2-BeO composite fuel and traditional UO2 fuel performance during normal conditions and RIA were done in this paper by modified version of FRAPCON4.0 and FRAPTRAN2.0. Finally, comparisons between UO2-BeO and UO2 performance were conducted. The results shows that the peaking temperature of fuel can be reduced about 200K and 150K during normal conditions and RIA by adopting UO2-BeO, respectively. At the same time, the onset of pellet-cladding mechanic interaction (PCMI) can be delayed about 100days during normal conditions and the weakened PCMI effect can be expected during reactivity insertion accidents (RIA) due to the lower thermal expansion coefficient and temperature distribution for UO2-BeO composite fuel. Also, enthalpy stored in UO2-BeO fuel is reduced about 1/5 compared with that of UO2. However, fission gas release ration of UO2-BeO was a bit larger than that of UO2 due to its higher average burnup. And, further experiments stilled required to gain data for UO2-BeO during high burnup, like possibly reduced thermal conductivity and fission gas release threshold.
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10

Xin, Jin, Xiaohan Liu, and Xiaoyan Wei. "A New Numerical Method for Fuel Temperature Calculation." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66248.

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For most fuel rod codes, the time independent heat conduction equation, which is a steady heat conduction equation, is applied in fuel temperature calculation. However, it can affect the fuel temperature prediction in II condition, which the linear power has much change in some seconds. For improving the fuel temperature prediction in II condition, this paper gives a new numerical method, which combines classical thermal conduction integration method and the difference applied in time partial derivative. For guaranteeing the numerical method’s stability and convergence rate, the multi-dimension Newton-Raphson procedure are applied in fuel temperature calculation. This paper describes the theoretical deduction of the numerical method, and Halden fuel thermal conductivity model applied in fuel temperature calculation. In order to verify new numerical method’s correctness, stability and convergence rate, the comparison between numerical solution and analytic solution is performed in 4 hypothetical conditions that the power transient duration is respectively 3s, 15s, 30s and 120s, the linear power changes from 15kW/m to 45 kW/m, and the fuel pellet surface temperature changes from 400 degree to 750 degree. And fuel density, specific heat and thermal conductivity are assumed as constants so that there exists analytic solution in this condition. The 4 hypothetical conditions have covered the worst II condition. According to the results in 4 hypothetical conditions, the fuel centerline temperature relative difference between numerical solution and theoretical solution is less than 0.6%, and the iterations are less than 5. So the numerical method possesses excellent correctness, stability and convergence, and this method has much potential in application in fuel rod code.
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