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Academic literature on the topic 'Impurity models'

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Published: 25 May 2024

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Journal articles on the topic "Impurity models"

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Weston, Robert. "Impurity operators in RSOS models." Journal of Physics A: Mathematical and General 33, no. 48 (November 24, 2000): 8981–9001. http://dx.doi.org/10.1088/0305-4470/33/48/326.

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Hewson, A. C., A. Oguri, and D. Meyer. "Renormalized parameters for impurity models." European Physical Journal B 40, no. 2 (August 2004): 177–89. http://dx.doi.org/10.1140/epjb/e2004-00256-0.

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Qiu, Huanhuan, Jianing Zhuang, Li Huang, Jianzhou Zhao, and Liang Du. "Improved Hubbard-I approximation impurity solver for quantum impurity models." Journal of Physics: Condensed Matter 31, no. 2 (December 7, 2018): 025601. http://dx.doi.org/10.1088/1361-648x/aaee95.

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Hafermann, H., C. Jung, S. Brener, M. I. Katsnelson, A. N. Rubtsov, and A. I. Lichtenstein. "Superperturbation solver for quantum impurity models." EPL (Europhysics Letters) 85, no. 2 (January 2009): 27007. http://dx.doi.org/10.1209/0295-5075/85/27007.

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Bracken, Anthony J., Xiang-Yu Ge, Mark D. Gould, and Huan-Qiang Zhou. "Integrable extended Hubbard models with boundary Kondo impurities." Bulletin of the Australian Mathematical Society 64, no. 3 (December 2001): 445–67. http://dx.doi.org/10.1017/s0004972700019912.

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Three kinds of integrable Kondo impurity additions to one-dimensional q-deformed extended Hubbard models are studied by means of the boundary Z2-graded quantum inverse scattering method. The boundary K matrices depending on the local magnetic moments of the impurities are presented as nontrivial realisations of the reflection equation algebras in an impurity Hilbert space. The models are solved by using the algebraic Bethe ansatz method, and the Bethe ansatz equations are obtained.
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Jin-Jun, Liang, Clive Emary, and Tobias Brandes. "Quantum Impurity Models with Coupled Cluster Method." Communications in Theoretical Physics 54, no. 3 (September 2010): 509–17. http://dx.doi.org/10.1088/0253-6102/54/3/26.

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Morozov, D. Kh. "Reduced Models of Impurity Seeded Edge Plasmas." Contributions to Plasma Physics 48, no. 1-3 (March 2008): 234–42. http://dx.doi.org/10.1002/ctpp.200810041.

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Salleh, Faiz, and Hiroya Ikeda. "Influence of Impurity Band on Seebeck Coefficient in Heavily-Doped Si." Advanced Materials Research 222 (April 2011): 197–200. http://dx.doi.org/10.4028/www.scientific.net/amr.222.197.

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We calculated the Seebeck coefficient of heavily-doped Si based on theoretical models of impurity-band formation, ionization-energy shift and conduction-band tailing. The impurity band was described by using two kinds of band-width definitions and it was found that the calculated Seebeck coefficient strongly depended on the impurity-band definition. In the high impurity-concentration region, the Seebeck coefficient decreased with increasing impurity concentration, and with a peak around 1×1019 cm-3. This result was qualitatively in good agreement with the experimental result, while there was quantitative disagreement between them.
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Petrenko, T. L., V. V. Teslenko, and E. N. Mokhov. "Models of Impurity Boron in Various SiC Polytypes." Defect and Diffusion Forum 103-105 (January 1993): 667–72. http://dx.doi.org/10.4028/www.scientific.net/ddf.103-105.667.

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Mochizuki, Kazuhiro, Fumimasa Horikiri, Hiroshi Ohta, and Tomoyoshi Mishima. "Models for Impurity Incorporation during Vapor-Phase Epitaxy." Materials Science Forum 1062 (May 31, 2022): 3–7. http://dx.doi.org/10.4028/p-9bg88x.

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Impurity incorporation during vapor-phase epitaxy on stepped surfaces was modeled by classifying rate-limiting processes into i) surface diffusion, ii) step kinetics, and iii) segregation. Examples were shown for i) desorption-limited Al incorporation during chemical vapor deposition (CVD) of (0001) SiC, ii) preferential desorption of C atoms from kinks during CVD of Al-doped (000-1) SiC, and iii) segregation-limited C incorporation during metalorganic vapor-phase epitaxy of (0001), (000-1), and (10-10) GaN.
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Dissertations / Theses on the topic "Impurity models"

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Glossop, Matthew T. "Theoretical studies of Anderson impurity models." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365734.

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Dickens, Nigel L. "Quantum impurity models : a local moment approach." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270010.

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Simpson, James. "Theoretical studies of Jahn-Teller impurity ion complexes in III-V semiconductors." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329837.

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Holzner, Andreas Michael. "DMRG studies of Chebyshev-expanded spectral functions and quantum impurity models." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-139333.

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Sandven, Håkon. "Evaluation of Distribution Function Models for ICRH-induced Impurity Transport in Tokamaks." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192460.

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Fusion power is the utilization of the energy released in nuclear fusion reactions. It has the potential to become an energy source which is more sustainable, safer and cleaner than the primary energy sources today. The fundamental problem for fusion power is energy confinement. Impurity ions are a major source of energy confinement loss in magnetic confinement fusion devices. Hence, impurity transport in fusion plasma is an important field to study. Ion cyclotron resonance heating (ICRH) has been shown both experimentally and theoretically to influence impurity transport in tokamaks. A poloidal asymmetry in the minority ions produces an electric potential, which causes impurity accumulation on the inboard side of the tokamak. Poloidal asymmetry in the impurity density induces a net radial impurity flux over a flux surface. This project has compared the ICRH-induced impurity transport for four approximate minority ion distribution function models with numerical results from the SELFO code. This has been done computationally for JET-like, concentric tokamak geometry with deuterium plasma, hydrogen minority ions, and tungsten impurities. Two models, the so-called bi-Maxwellian and LFS bi-Maxwellian model, are used in existing literature. Two further models are introduced, called the tri-Maxwellian and LFS tri-Maxwellian model. Unlike the bi-Maxwellian models, these models take into account the existence of thermal and fast ions in the minority population. The results show that there are noticeable differences between the different models, in particular when the resonant surface is on the inboard side. The tri-Maxwellian models offer a clear improvement over the bi-Maxwellian models compared with SELFO. However, there are some features in the SELFO results that none of the approximate models predict, this is because the models neglects wide orbits. A possible barrier in the radial transport has also been identified at flux surfaces where the impurity density asymmetry closely resembles the magnetic field strength asymmetry. The LFS bi-Maxwellian model predicts the radial position of the barrier most accurately and reliably compared with SELFO.
Fusionsenergi är utnyttjandet av energi som frigörs i kärnfusionsreaktioner, och har potential för att bli en energikälla som är mer hållbar, säkrare och renare än de primära energikällorna idag. Det grundläggande problemet för fusionskraft är energiinneslutning. Förorenande joner är en viktig källa för förlust av energiinneslutning i fusionsanläggningar med magnetisk inneslutning. Därför är föroreningstransport i fusionsplasma ett viktigt ämnesområde. Joncyklotronresonansupphettning (ICRH) har visats både experimentellt och teoretiskt att påverka föroreningstransport i tokamaker. En poloidal asymmetri i minoritetsjonerna ger en elektrisk potential, som orsakar förorening samlas på den inre sidan av fusionsanläggningen. Poloidal asymmetri i föroreningsdensiteten på ett fluxyta inducerar en netto radialflux över fluxytan. Detta projekt har jämfört ICRH-inducerad föroreningstransport för fyra approximativa distributionsfunktionsmodeller för minoritetsjon med numeriska resultat från SELFO koden. Detta har gjorts med beräkningar för JET-liknande, kon-centrisk tokamak-geometri med deuterium-plasma, väte som minoritetsjoner, och volfram som föroreningsjoner. Två modeller, s.k. bi-Maxwellian- och LFS bi-Maxwellianmodellen, används i existerande litteratur. Ytterligare två modeller introduceras, kallad tri-Maxwellian- och LFS tri-Maxwellianmodellen. Dessa modeller tar hänsyn till förekomsten av termiska och snabba joner i minoritetsbefolkningen. Resultaten visar att det finns tydliga skillnader mellan de olika modellerna, särskilt när resonansytan är på den inre sidan. Tri-Maxwellianmodellerna visar en klar förbättring över bi-Maxwellianmodellerna jämfört med SELFO. Det finns dock vissa särdrag i resultaten från SELFO som ingen av de approximative modellerna förutsäger, eftersom modellerna försummar breda banor. En möjlig barriär i den radiella transporten har också blivit identifierat på fluxytor där asymmetrin i föroreningsdensiteten liknar asymmetrin i den magnetiska fältstyrkan. LFS bi-Maxwellianmodellen förutsäger den radiella positionen av barriären mest noggrant och tillförlitligt jämfört med SELFO.
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Sindel, Michael. "Numerical Renormalization Group studies of Quantum Impurity Models in the Strong Coupling Limit." Diss., lmu, 2005. http://nbn-resolving.de/urn:nbn:de:bvb:19-31150.

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Münder, Wolfgang. "Matrix product state clculations for one-dimensional quantum chains and quantum impurity models." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-135224.

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Hanl, Markus Johannes. "Optical and transport properties of quantum impurity models - an NRG study of generic models and real physical systems." Diss., Ludwig-Maximilians-Universität München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:19-174608.

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This thesis contributes to the understanding of impurity models. It is divided into two main parts, with a general introduction given in Part I and the research related to it presented in Part II, with the second part being subdivided into two main projects. In the first project, the influence of two many-body effects, the Kondo effect and the Fermi edge singularity, on the absorption and emission spectra of self-assembled quantum dots (QDs) is examined. Whereas the Kondo effect so far was always examined with transport experiments, we show that it has been observed with optical methods for the first time, by comparing experimental data for the absorption line shapes of QDs to calculations with the numerical renormalization group. We continue by examining a QD with strong optical coupling of the energy levels. The resulting interplay of Rabi-oscillations and Kondo effect leads to a new many-body state, a secondary, outer Kondo effect, with Kondo-like correlations between the spin-Kondo and the trion state. The last work regarding optics at QDs addresses the Fermi edge singularity. We show that for QDs this phenomenon can be described numerically on a quantitative level. The second project concerns transport properties of impurity models. First, we present a comprehensive study of the Kondo effect for an InAs-nanowire QD, a system for which the Kondo effect was observed only a few years ago. The second study regarding transport concerns the Kondo effect in bulk metals with magnetic impurities. Although nowadays the Kondo effect is often studied with QDs, it was discovered for iron impurities in noble metals like gold and silver. However, it was unknown for a long time which exact realization of Kondo model describes these systems. We identify the model by comparing numerical calculations for the magnetoresistivity and the dephasing rate for different models to experimental results. The third work about transport concerns the phenomenon that for a fixed type of Kondo model quantities like the magnetoresistivity or the conductivity, respectively, can be scaled onto a universal curve for different parameters, when energies are rescaled with the the Kondo temperature $T_K$, since it is the only relevant low energy scale of the problem. For finite bandwidth, however, different definitions of $T_K$ (which coincide in the limit of infinite bandwidth) lead to different $T_K$-values. We show that with a very common definition of $T_K$, finite bandwidth, which is always present at numerical calculations, can deteriorate the universality of rescaled curves, and we offer an alternative definition of $T_K$ which ensures proper scaling. In the last study presented in this thesis we calculate the Fermi-liquid coefficients for fully screened multi-channel Kondo models. For temperatures below $T_K$, these models show Fermi-liquid behavior, and the impurity density of states and certain quantities which depend on it, like resistivity, show quadratic dependencies on parameters like temperature or magnetic field, described by the Fermi-liquid coefficients. We calculate these coefficients both analytically and numerically.
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De, Leo Lorenzo. "Non-Fermi liquid behavior in multi-orbital Anderson impurity models and possible relevance for strongly correlated lattice models." Doctoral thesis, SISSA, 2004. http://hdl.handle.net/20.500.11767/4016.

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Bidzhiev, Kemal. "Out-of-equilibrium dynamics in a quantum impurity model." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS352/document.

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Le domaine des problèmes quantiques à N-corps à l'équilibre et hors d'équilibre sont des sujets majeurs de la Physique et de la Physique de la matière condensée en particulier. Les propriétés d'équilibre de nombreux systèmes unidimensionnels en interaction sont bien comprises d'un point de vue théorique, des chaînes de spins aux théories quantiques des champs dans le continue. Ces progrès ont été rendus possibles par le développement de nombreuses techniques puissantes, comme, par exemple, l'ansatz de Bethe, le groupe de renormalisation, la bosonisation, les états produits de matrices ou la théorie des champs invariante conforme. Même si les propriétés à l'équilibre de nombreux modèles soient connues, ceci n'est en général pas suffisant pour décrire leurs comportements hors d'équilibre, et ces derniers restent moins explorés et beaucoup moins bien compris. Les modèles d'impuretés quantiques représentent certains des modèles à N-corps les plus simples. Mais malgré leur apparente simplicité ils peuvent capturer plusieurs phénomènes expérimentaux importants, de l'effet Kondo dans les métaux aux propriétés de transports dans les nanostructures, comme les points quantiques. Dans ce travail nous considérons un modèle d'impureté appelé "modèle de niveau résonnant en interaction" (IRLM). Ce modèle décrit des fermions sans spin se propageant dans deux fils semi-infinis qui sont couplés à un niveau résonant -- appelé point ou impureté quantique -- via un terme de saut et une répulsion Coulombienne. Nous nous intéressons aux situations hors d'équilibre où un courant de particules s'écoule à travers le point quantique, et étudions les propriétés de transport telles que le courant stationnaire (en fonction du voltage), la conductance différentielle, le courant réfléchi, le bruit du courant ou encore l'entropie d'intrication. Nous réalisons des simulations numériques de la dynamique du modèle avec la méthode du groupe de renormalisation de la matrice densité dépendent du temps (tDMRG), qui est basée sur une description des fonctions d'onde en terme d'états produits de matrices. Nous obtenons des résultats de grande précision concernant les courbes courant-voltage ou bruit-voltage de l'IRLM, dans un grand domaine de paramètres du modèle (voltage, force de l'interaction, amplitude de saut vers le dot, etc.). Ces résultats numériques sont analysés à la lumière de résultats exacts de théorie des champs hors d'équilibre qui ont été obtenus pour un modèle similaire à l'IRLM, le modèle de Sine-Gordon avec bord (BSG). Cette analyse est en particulier basée sur l'identification d'une échelle d'énergie Kondo et d'exposants décrivant les régimes de petit et grand voltage. Aux deux points particuliers où les modèles sont connus comme étant équivalents, nos résultats sont en accord parfait avec la solution exacte. En dehors de ces deux points particuliers nous trouvons que les courbes de transport de l'IRLM et du modèle BSG demeurent très proches, ce qui était inattendu et qui reste dans une certaine mesure inexpliqué
The fields of in- and out-of-equilibrium quantum many-body systems are major topics in Physics, and in condensed-matter Physics in particular. The equilibrium properties of one-dimensional problems are well studied and understood theoretically for a vast amount of interacting models, from lattice spin chains to quantum fields in a continuum. This progress was allowed by the development of diverse powerful techniques, for instance, Bethe ansatz, renormalization group, bosonization, matrix product states and conformal field theory. Although the equilibrium characteristics of many models are known, this is in general not enough to describe their non-equilibrium behaviors, the latter often remain less explored and much less understood. Quantum impurity models represent some of the simplest many-body problems. But despite their apparent simplicity, they can capture several important experimental phenomena, from the Kondo effect in metals to transport in nanostructures such as point contacts or quantum dots. In this thesis consider a classic impurity model - the interacting resonant level model (IRLM). The model describes spinless fermions in two semi-infinite leads that are coupled to a resonant level -- called quantum dot or impurity -- via weak tunneling and Coulomb repulsion. We are interested in out-of-equilibrium situations where some particle current flows through the dot, and study transport characteristics like the steady current (versus voltage), differential conductance, backscattered current, current noise or the entanglement entropy. We perform extensive state-of-the-art computer simulations of model dynamics with the time-dependent density renormalization group method (tDMRG) which is based on a matrix product state description of the wave functions. We obtain highly accurate results concerning the current-voltage and noise-voltage curves of the IRLM in a wide range parameter of the model (voltage bias, interaction strength, tunneling amplitude to the dot, etc.).These numerical results are analyzed in the light of some exact out-of-equilibrium field-theory results that have been obtained for a model similar to the IRLM, the boundary sine-Gordon model (BSG).This analysis is in particular based on identifying an emerging Kondo energy scale and relevant exponents describing the high- and low- voltage regimes. At the two specific points where the models are known to be equivalent our results agree perfectly with the exact solution. Away from these two points, we find that, within the precision of our simulations, the transport curves of the IRLM and BSG remain very similar, which was not expected and which remains somewhat unexplained
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Books on the topic "Impurity models"

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Ottieri, Alessandra. L' esperienza dell'impuro: Filosofia, fisiologia, chimica, arte e altre "impurità" nella scrittura di Valéry, Ungaretti, Sinisgalli, Levi. Roma: Aracne, 2006.

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L' esperienza dell'impuro: Filosofia, fisiologia, chimica, arte e altre "impurità" nella scrittura di Valéry, Ungaretti, Sinisgalli, Levi. Roma: Aracne, 2006.

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Schwanke, Peter. Implementation into DIVIMP of a drift-kinetic model derived from the Fokker-Planck equation to examine the parallel-to-B velocity component of impurity ions in divertor-tokamak plasmas. Toronto: Department of Aerospace Science and Engineering, University of Toronto, 2001.

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Comtet1, Alain, and Yves Tourigny2. Impurity models and products of random matrices. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198797319.003.0011.

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This is an introduction to the theory of one-dimensional disordered systems and products of random matrices, confined to the 2×2 case. The notion of impurity model—that is, a system in which the interactions are highly localized—links the two themes and enables their study by elementary mathematical tools. After discussing the spectral theory of some impurity models, Furstenberg’s theorem is stated and illustrated, which gives sufficient conditions for the exponential growth of a product of independent, identically distributed matrices.
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Engh, Thorvald Abel, Geoffrey K. Sigworth, and Anne Kvithyld. Principles of Metal Refining and Recycling. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198811923.001.0001.

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Covers the field of recycling and refining of metals. An important point the book stresses is that the principles are the same in the treatment of various different metals. The book answerd why it is important to have a clean and properly alloyed metal from recycling and refined metal? The text covers basic thermodynamics, physical and transport properties, mixing, mass transfer and numerical models. Further it identifies problems and described methods for removal of dissolved impurity elements, particles and inclusions, also during solidification. And lastly applications remelting and addition of alloys, recycling and challenges and specific processes for each metal are included. The book is self-contained.
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Nardelli, Matilde. Antonioni and the Aesthetics of Impurity. Edinburgh University Press, 2020. http://dx.doi.org/10.3366/edinburgh/9781474444040.001.0001.

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Michalangelo Antonioni’s 1960s films are widely recognized as both exemplars of cinema and key texts in ushering in cinema’s ‘modern’ incarnation. Reconnecting Antonioni’s aesthetically audacious films of the 1960s to the ferment of their historical time, Antonioni and the Aesthetics of Impurity addresses these works’ crucial, yet overlooked, affinity with the new ‘impure’ art practices that emerged in the period. At the same time, the book also offers a novel reading of the films’ dialogue with postwar pictorial abstraction. Revealing an Antonioni who embraced both mixed and mass media and reflected on them via his cinema, the book, through both an intermedial and a transnational focus, replaces auteuristic accounts of the director’s work with a new understanding of its critical significance in late-twentienth century cinema and visual culture.
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Moran, Richard. Williams, History, and the “Impurity of Philosophy”. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780190633776.003.0011.

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In addition to his contributions to the history of philosophy, Bernard Williams’s later work is concerned with more explicit reflection on the role of history in the constitution of the discipline of philosophy, the fact that, unlike the case of the natural sciences, the great figures of philosophy are part of the contemporary discussion in philosophy. In addition these reflections became increasingly concerned with what is distinctive about history as a form of knowledge, a form of knowledge which does not attract the attention of analytic philosophers. Historical knowledge is at once empirical and evidence-based but also, insofar as it concerns human affairs and institutions, obliged to make sense of and reconstruct the perspective of the practices and participants themselves. Part of the importance of historical understanding for Williams lies in its position as a model for humanistic knowledge that is non-reductionist while also being non-ideal, empirical, and “impure.”
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Martin, Peter. China's Civilian Army. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197513705.001.0001.

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China’s Civilian Army tells the story of China’s transformation from an isolated and impoverished communist state to a global superpower from the perspective of its diplomats. In the early days of the People’s Republic, diplomats were highly disciplined, committed communists who feared revealing any weakness to the threatening capitalist world. Remarkably, the model that revolutionary leader Zhou Enlai established continues to this day despite the massive changes the country has undergone in recent decades. Even today, Chinese diplomats work in pairs so that one can always watch the other for signs of ideological impurity. China’s Civilian Army charts the history of China’s diplomatic corps from its earliest days through to the present, drawing on the memoirs of more than a hundred retired diplomats and dozens of interviews.
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Urban, Hugh B. Purity. Edited by Michael Stausberg and Steven Engler. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780198729570.013.43.

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Purity is an extremely varied and heterogeneous religious ideal that lies at the critical intersection between the individual physical body, the social body, and the cosmos as a whole. At once a material and a spiritual ideal, purity overlaps partially with but far exceeds modern notions of cleanliness or hygiene; indeed, it may in some cases even contradict the latter. One can distinguish five different forms of purity, each in this chapter illustrated by one primary example: physical purity, social purity, mental purity, sexual purity, and the ritual use of impurity. There is also a variety of contemporary theoretical approaches to purity, drawn from psychology, cognitive science, cultural anthropology, gender studies, and comparative religions.
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Foltz, Jonathan. Fables of Detachment. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190676490.003.0002.

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This chapter outlines the way that film shaped key modernist debates about aesthetic form and the elevation of literature as a form of art. It draws on a range of contemporaneous theories of aesthetic form—from those of Roger Fry and Clive Bell to those of Vernon Lee, José Ortega y Gasset, I. A. Richards, and William Empson—and suggests that critics have failed adequately to credit the historical anxiety about media and mediation implicit in modernist constructions of autonomy. The desire to distinguish the purity of artistic form from ordinary modes of lived perception frequently led theorists to ponder, and puzzle at, the remarkable impurity of cinema. Indeed, film in the modernist period was commonly understood as a figure of aesthetic paradox: lacking the purposive form and stylistic nuance of true art, yet also exemplifying the detachment from life that art was held to achieve.
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Book chapters on the topic "Impurity models"

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Okiji, A., S. Suga, M. Yamashita, and N. Kawakami. "Elementary Excitations for Impurity Models." In Correlation Effects in Low-Dimensional Electron Systems, 96–104. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85129-2_9.

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Post, D. E., and K. Lackner. "Plasma Models for Impurity Control Experiments." In Physics of Plasma-Wall Interactions in Controlled Fusion, 627–93. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4757-0067-1_16.

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Lesage, F., H. Saleur, and P. Simonetti. "New Exact Results for Quantum Impurity Problems." In Calogero—Moser— Sutherland Models, 299–312. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1206-5_19.

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Lee, In-Ho, Kang-Hun Ahn, Yong-Hoon Kim, Richard M. Martin, and Jean-Pierre Leburton. "Capacitive Energy of Quantum Dots with Hydrogenic Impurity." In Physical Models for Quantum Dots, 145–62. New York: Jenny Stanford Publishing, 2021. http://dx.doi.org/10.1201/9781003148494-8.

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Weng, Yilin, and J. P. Leburton. "Impurity Scattering with Semiclassical Screening in Multiband Quasi-One-Dimensional Systems." In Physical Models for Quantum Wires, Nanotubes, and Nanoribbons, 59–76. New York: Jenny Stanford Publishing, 2023. http://dx.doi.org/10.1201/9781003219378-6.

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Fortunelli, A., A. Desalvo, O. Salvetti, and E. Albertazzi. "Cluster Simulations of Amorfous Silicon, with and without an Impurity Boron Atom." In Cluster Models for Surface and Bulk Phenomena, 595–603. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4684-6021-6_47.

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Kroha, Johann, and Peter Wölfle. "Diagrammatic Theory of Anderson Impurity Models: Fermi and Non-Fermi Liquid Behavior." In Open Problems in Strongly Correlated Electron Systems, 101–10. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0771-9_11.

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Belenkii, A. Ya. "A Cluster Model of the Electronic Structure of Grain Boundaries with the Impurity Segregation and Particles Precipitation." In Cluster Models for Surface and Bulk Phenomena, 577–85. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4684-6021-6_45.

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Takeno, Shozo, and Hideaki Matsueda. "Atomic Operator Formalism of Elementary Gates for Quantum Computation and Impurity-Induced Exciton Quantum Gates." In Mathematical Models of Non-Linear Excitations, Transfer, Dynamics, and Control in Condensed Systems and Other Media, 195–204. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4799-0_17.

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Debertolis, Maxime. "Random Matrix Impurity Model." In Springer Theses, 95–127. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-47233-6_6.

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Conference papers on the topic "Impurity models"

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Žitko, Rok, and Janez Bonča. "Non-Fermi-liquid properties of three-impurity Anderson models." In LECTURES ON THE PHYSICS OF STRONGLY CORRELATED SYSTEMS XI: Eleventh Training Course in the Physics of Strongly Correlated Systems. AIP, 2007. http://dx.doi.org/10.1063/1.2752007.

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Nishio, Osamu, Masahiro Takenaka, Eiji Aoki, Norio Mizukoshi, and Katsumasa Fujii. "Calibration of TCAD Models for High Dose Impurity Diffusion." In 1997 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 1997. http://dx.doi.org/10.7567/ssdm.1997.a-5-2.

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Ringel, M., V. Janiš, Adolfo Avella, and Ferdinando Mancini. "Strong electron correlation in impurity models: singlet and triplet multiple scatterings." In LECTURES ON THE PHYSICS OF STRONGLY CORRELATED SYSTEMS XIII: Thirteenth Training Course in the Physics of Strongly Correlated Systems. AIP, 2009. http://dx.doi.org/10.1063/1.3225484.

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Das, Saptarshi, Shamik Sural, Jaideep Vaidya, and Vijayalakshmi Atluri. "Using Gini Impurity to Mine Attribute-based Access Control Policies with Environment Attributes." In SACMAT '18: The 23rd ACM Symposium on Access Control Models and Technologies. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3205977.3208949.

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Janiš, Václav, and Antonín Klíč. "Kondo Temperature and High to Low Temperature Crossover in Impurity Models of Correlated Electrons." In Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019). Journal of the Physical Society of Japan, 2020. http://dx.doi.org/10.7566/jpscp.30.011124.

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Kawaguchi, Munemichi. "Phase-Field Model for Recrystallization of Impurities in Sodium Coolant." In 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-65721.

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Abstract In researches and developments (R&Ds) on sodium (Na) management technology, the experimental data related to a cold trap and a plugging meter have been accumulated in each country because the impurities such as sodium oxide (Na2O), sodium hydride (NaH) and/or sodium hydroxide (NaOH) in Na coolant accelerate the corrosion on the stainless-steel surface. The cold trap has stainless-steel wire mesh and wall where the saturated impurities are recrystallized to remove the impurity in the Na coolant. Similarly, the plugging meter has stainless-steel orifice where the saturated impurities are recrystallized to measure the saturation concentration (plug temperature). The recrystallization is common physical chemistry phenomena, in which is dominated by the temperature and the concentration. To date, a phase-field model (PFM) has been developed extensively as a powerful tool to predict microstructure evolution of micro–meso scale. Especially, the PFM has some simulation merits: it can calculate movement of interface without explicit trace of the interface (calculate robustly the large deformation), and this simulation results are known to be consistent with the thermodynamics data. In this study, we developed the simulation models for complex recrystallization of one impurity in Na coolant using the PFM, and confirmed that the simulation results are reasonable for the experimental data with the operating experience. In the simulation results for the one impurity of Na2O or NaH, we concluded that the kinetics of recrystallization was determined by the solubility and/or diffusion behavior in liquid Na.
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Slepchuk, Kira, Kira Slepchuk, Tatyana Khmara, and Tatyana Khmara. "AVAILABILITY OF NUMERICAL MATHEMATICAL MODELS TO SOLVE THE APPLIED PROBLEMS OF WATER QUALITY MANAGEMENT OF SHELF ECOSYSTEMS." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b93b74031e6.93146133.

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The problems appeared during development and calibration of one-dimensional (vertical resolution) biogeochemical block of water quality model, are discussed. It is extremely useful in the initial stage of shelf ecosystems research because of its simplicity in as implementation as result interpretation. To describe the environmental parameters dynamics we used the Model for Estuarine and Coastal Circulation Assessment, which consists of hydrodynamic model; model of conservative impurity transport; chemical and biological model. The seasonal of biogenic elements and phytoplankton variability in the Sevastopol Bay is studied as an example.
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Slepchuk, Kira, Kira Slepchuk, Tatyana Khmara, and Tatyana Khmara. "AVAILABILITY OF NUMERICAL MATHEMATICAL MODELS TO SOLVE THE APPLIED PROBLEMS OF WATER QUALITY MANAGEMENT OF SHELF ECOSYSTEMS." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b43172900b2.

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The problems appeared during development and calibration of one-dimensional (vertical resolution) biogeochemical block of water quality model, are discussed. It is extremely useful in the initial stage of shelf ecosystems research because of its simplicity in as implementation as result interpretation. To describe the environmental parameters dynamics we used the Model for Estuarine and Coastal Circulation Assessment, which consists of hydrodynamic model; model of conservative impurity transport; chemical and biological model. The seasonal of biogenic elements and phytoplankton variability in the Sevastopol Bay is studied as an example.
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Azeem, M. Mustafa, Di Yun, and Muhammad Zubair. "Atomic Insights on Interaction Mechanism of Dislocation With Void/Impurity/Precipitates in BCC Iron." In 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-65197.

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Abstract Ferritic steels are important cladding and structural material for current and advanced reactors containing Fe as a primary compositional matrix element. Three proposed models containing voids, impurity P, and nano oxides embedded in Fe were simulated using molecular dynamics code LAMMPS. The interaction mechanism of dislocation for each model was observed and compared by analyzing its strengthening effect through the stress-strain curve. In considering the interaction of dislocation with voids, it was observed that for all void sizes, dislocation bypass voids following orowan unpinning mechanism without any loop irrespective of any radii, while for P clusters, dislocation is trapped at the interface and leaves it after making a screw dipole shape following orowan mechanism. Moreover, the oxide dislocation interaction in oxide dispersed in iron follow the orowan unpinning mechanism accompanied by loops around oxide. The values of critical unpinning stress for all models were analyzed and compared. Atomic insights on the interaction mechanism indicate that the interaction mechanism is essentially the same for void and a P cluster in Fe i.e. orowan unpinning mechanism. The presence of oxide in Fe matrix during its interaction follows the orowan unpinning mechanism along with a dislocation loop around the oxide and its area is proportional to the size of the oxide. The critical unpinning stress was compared and analyzed for each model. This work will provide a unique and valuable insight into the strengthening mechanism due to dispersed oxides by providing new parameters for the multi-scale simulation. Our results demonstrate that oxide impedes dislocations and offers hindrance for edge dislocations to saturate further. Furthermore, our simulation results provide atomic insight into the onset of plasticity in iron alloys.
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Tamura, Akinori, Shiro Takahashi, Hiroyuki Nakata, and Akio Takota. "Development of Evaluation Method for Cold Trap in Fast Breeder Reactor: Part 1 — Numerical Analysis of Impurity Precipitation on Mesh Wire." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67702.

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A cold trap is one of the important components in the Fast Breeder Reactor (FBR) to control oxygen and hydrogen concentration of liquid sodium. For more accurate evaluation of the cold trap performance, we have started a research program to develop the evaluation method based on the 3D numerical analysis. Our evaluation method consists of two steps: one is a numerical analysis of sodium compound deposition on the mesh wires; the other is a numerical analysis of the sodium flow in the cold trap where the effect of the sodium compound deposition is considered as local pressure loss increment. In this study, we have focused on the development of the numerical analysis method of the sodium compound deposition on the mesh wires of the cold trap. As a numerical method, we have adopted the lattice Boltzmann method which is known to be useful for the flow simulation around the complex geometry like the mesh wires. In order to apply the lattice Boltzmann method to the sodium compound deposition simulation around the mesh wire, we proposed a low Reynolds number model and an impurity precipitation model for the conventional lattice Boltzmann method. The low Reynolds number model was validated by a comparison with a theoretical solution of the two-dimensional channel flow. To validate the impurity precipitation model, we conducted a precipitation experiment by using the supersaturated sucrose in the water instead of the liquid sodium with the oxygen and the hydrogen. The comparison between the experiment and the simulation showed good agreement regarding the pressure loss increment. From these results, we confirmed the accuracy of the low Reynolds number model and the impurity precipitation model. The accuracy of our models in the sodium condition will be confirmed in the future study.
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Reports on the topic "Impurity models"

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Cox, L. E., J. M. Peek, and J. W. Allen. Pu 4f XPS spectra analyzed in the Anderson impurity model. Office of Scientific and Technical Information (OSTI), May 1998. http://dx.doi.org/10.2172/296778.

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Veerasingam, Ramanapathy. A one-dimensional plasma and impurity transport model for reversed field pinches. Office of Scientific and Technical Information (OSTI), November 1991. http://dx.doi.org/10.2172/10103441.

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West, W. P., T. E. Evans, and N. H. Brooks. Modeling of impurity spectroscopy in the divertor and SOL of DIII-D using the 1D multifluid model NEWT1D. Office of Scientific and Technical Information (OSTI), October 1996. http://dx.doi.org/10.2172/453536.

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Patchett, B. M., and A. C. Bicknell. L51706 Higher-Strength SMAW Filler Metals. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 1993. http://dx.doi.org/10.55274/r0010418.

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The welding of high strength steels in general, and for pipeline fabrication in particular, has shown that cracking due to hydrogen absorption during welding is more complex in these steels than in older, lower strength steels. In older steels, primary strengthening was accomplished with carbon, which caused hydrogen cracking in the base metal HAZ under reasonably predictable conditions involving microstructure, residual stress and hydrogen level. Pipeline steels were and are in the vanguard of change in strengthening philosophy. The change involves two areas of steel making, chemical composition and deformation processing. Pipeline steels now contain low carbon levels, in many cases less than 0.10%, and the resulting lack of strength is reclaimed by adding higher alloy levels to promote solution hardening (e.g. Mn), precipitation hardening (e.g. Cb, Cu) or transformation hardening (e.g. MO). In addition, alloy elements are added to improve toughness at high strength levels (e.g. Ni). At the same time, improvements have been made in reducing impurity and residual element levels, notably for S, P and O and N. Limitations on the effects of alloying additions on strength and toughness encouraged the use of deformation processing, primarily during rolling, to promote fine-grained microstructures to increase strength andtoughness simultaneously. Electrodes for the SMAW process have been developed for welding high-strength pipeline steels by using core wires made from high-strength microalloyed skelp extruded with cellulosic (Exx10) and low hydrogen (Exx16) flux coatings. The required alloy elements for high-strength deposits were therefore obtained from the core wire and not ferroalloy powders added to the flux, as is standard industrial practice. The idea behind this change was two fold: to avoid the possibility of introducing impurities from the varying sources of ferro alloy powders, including oxygen from the oxidized powder surfaces, and also to provide a closer match of the microalloy level to modern pipeline steel chemistries. The unknowns in this work were the effects of lower impurities/similar alloy content on the mechanical properties in the cast microstructure of a weld, compared to a pipe, and of the effect on electrode welding behaviour of a flux containing no ferro powders other than FeSi.
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