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Relevant bibliographies by topics / Thermodynamics Thermochemistry. Statistical mechanics / Dissertations / Theses

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Dissertations / Theses on the topic 'Thermodynamics Thermochemistry. Statistical mechanics'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Telotte, John Charles. "Thermodynamic properties of multicomponent mixtures from the solution of groups approach to direct correlation function solution theory." Gainesville, FL, 1985. http://www.archive.org/details/thermodynamicpro00telo.

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2

Parker, Daniel N. "Thermodynamics, reversibility and Jaynes' approach to statistical mechanics." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3803.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.<br>Thesis research directed by: Philosophy. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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3

Chapagain, Prem P. "The thermodynamics and statistical mechanics of protein folding." FIU Digital Commons, 2005. http://digitalcommons.fiu.edu/etd/2112.

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The physics of self-organization and complexity is manifested on a variety of biological scales, from large ecosystems to the molecular level. Protein molecules exhibit characteristics of complex systems in terms of their structure, dynamics, and function. Proteins have the extraordinary ability to fold to a specific functional three-dimensional shape, starting from a random coil, in a biologically relevant time. How they accomplish this is one of the secrets of life. In this work, theoretical research into understanding this remarkable behavior is discussed. Thermodynamic and statistical mech

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4

Campisi, Michele Kobe Donald Holm. "Microscopic foundations of thermodynamics and generalized statistical ensembles." [Denton, Tex.] : University of North Texas, 2008. http://digital.library.unt.edu/permalink/meta-dc-6128.

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5

Wustmann, Waltraut. "Statistical mechanics of time-periodic quantum systems." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-38126.

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The asymptotic state of a quantum system, which is in contact with a heat bath, is strongly disturbed by a time-periodic driving in comparison to a time-independent system. In this thesis an extensive picture of the asymptotic state of time-periodic quantum systems is drawn by relating it to the structure of the corresponding classical phase space. To this end the occupation probabilities of the Floquet states are analyzed with respect to their semiclassical property of being either regular or chaotic. The regular Floquet states are occupied with exponential weights e^{-betaeff Ereg} similar t

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6

Campisi, Michele. "Microscopic Foundations of Thermodynamics and Generalized Statistical Ensembles." Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc6128/.

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This dissertation aims at addressing two important theoretical questions which are still debated in the statistical mechanical community. The first question has to do with the outstanding problem of how to reconcile time-reversal asymmetric macroscopic laws with the time-reversal symmetric laws of microscopic dynamics. This problem is addressed by developing a novel mechanical approach inspired by the work of Helmholtz on monocyclic systems and the Heat Theorem, i.e., the Helmholtz Theorem. By following a line of investigation initiated by Boltzmann, a Generalized Helmholtz Theorem is stated a

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7

Ignaccolo, Massimiliano. "Complexity as a Form of Transition From Dynamics to Thermodynamics: Application to Sociological and Biological Processes." Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4209/.

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This dissertation addresses the delicate problem of establishing the statistical mechanical foundation of complex processes. These processes are characterized by a delicate balance of randomness and order, and a correct paradigm for them seems to be the concept of sporadic randomness. First of all, we have studied if it is possible to establish a foundation of these processes on the basis of a generalized version of thermodynamics, of non-extensive nature. A detailed account of this attempt is reported in Ignaccolo and Grigolini (2001), which shows that this approach leads to inconsistencies.

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8

Alberti, Giuseppe. "Statistical mechanics of self-gravitating systems in general relativity." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30309/document.

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La mécanique statistique des systèmes auto-gravitants constitue un des plus fascinants et mystérieux champs de recherche. À cause de la nature à longue-portée de la force gravitationnelle, la notion usuelle d'équilibre statistique est modifiée, faisant de cette étude un problème hors-équilibre. Par conséquent, ces systèmes exhibent certaines propriétés particulières comme, par exemple, l'existence de transitions de phase associées à un effondrement gravitationnel. Le travail présenté dans cette thèse a comme but une description détaillée des transitions de phase dans un cadre général relativis

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9

Anza, Fabio. "Pure states statistical mechanics : on its foundations and applications to quantum gravity." Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:316a0aa7-599d-4831-9d66-160d6c759b72.

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The project concerns the study of the interplay among quantum mechanics, statistical mechanics and thermodynamics, in isolated quantum systems. The goal of this research is to improve our understanding of the concept of thermal equilibrium in quantum systems. First, I investigated the role played by observables and measurements in the emergence of thermal behaviour. This led to a new notion of thermal equilibrium which is specific for a given observable, rather than for the whole state of the system. The equilibrium picture that emerges is a generalization of statistical mechanics in which we

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10

Carberry, David Michael. "Optical tweezers : experimental demonstrations of the fluctuation theorem /." View thesis entry in Australian Digital Theses Program, 2005. http://thesis.anu.edu.au/public/adt-ANU20060410.122727/index.html.

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11

Latella, Ivan. "Statistical thermodynamics of long-range interacting systems and near-field thermal radiation." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/400405.

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Two main topics are examined in this thesis: classical systems with long-range interactions and thermal radiation in the near-field regime. In the first part, we present a thermodynamic approach describing systems with long-range interactions which takes into account the intrinsic nonadditivity in these systems. The basic concept behind this approach is to consider a large ensemble of replicas of the system where the standard formulation of thermodynamics can be naturally applied and the properties of a single system can be consequently inferred. The formulation of the thermodynamic for these

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12

Acconcia, Thiago Vaz 1991. "Caminhos ótimos degenerados em sistemas termicamente isolados." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276953.

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Orientadores: Marcus Vinícius Segantini Bonança, Maurice de Koning<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-27T07:13:33Z (GMT). No. of bitstreams: 1 Acconcia_ThiagoVaz_M.pdf: 3294549 bytes, checksum: 001cb3dfa8e23080664b78fe7e5f527d (MD5) Previous issue date: 2015<br>Resumo: A termodinâmica é uma teoria do calor e trabalho, a qual descreve perfeitamente os processos quase-estáticos somente. Entretanto, além dos estados de equilíbrio, nós encontramos uma ampla classe de processos operando em tempo f

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Mishima, Hirokazu. "Studies Based on Statistical Mechanics for Mechanism of Multidrug Efflux of AcrA/AcrB/TolC." Kyoto University, 2015. http://hdl.handle.net/2433/199416.

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Carberry, David Michael, and dave_carberry@yahoo com au. "Optical Tweezers: Experimental Demonstrations of the Fluctuation Theorem." The Australian National University. Research School of Chemistry, 2006. http://thesis.anu.edu.au./public/adt-ANU20060410.122727.

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In the late 19th and early 20th centuries famous scientists like Boltzmann, Loschmidt, Maxwell and Einstein tried, unsuccessfully, to find the link between the time-reversible equations of motion of individual molecules and irreversible thermodynamics. The solution to this puzzle was found in 1993, and the link is now known as the Fluctuation Theorem (FT). In the decade that followed theory and computer simulation tested the FT and, in 2002, an experiment indirectly demonstrated the FT.¶ This thesis describes original experiments that demonstrate the FT directly using Optical Tweezers. A rela

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Olano, Lisa Renee. "Thermodynamics of Buried Water in Protein Cavities and Revised Algorithms for Introducing Polarizability to Molecular Dynamics Simulations." ScholarWorks@UNO, 2006. http://scholarworks.uno.edu/td/387.

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Free energy calculations for the transfer of a water molecule from the pure liquid to an interior cavity site in a protein are presented. Three different protein cavities, in bovine pancreatic trypsin inhibitor (BPTI), the I106A mutant of lysozyme, and in the I76A mutant of barnase, represent very different environments for the water molecule, one which is polar, forming four water-protein hydrogen bonds, and two which are more hydrophobic, only forming one or two water-protein hydrogen bonds. The calculations give very different free energies for the different cavities, with only the

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16

Robertson, Katherine. "Reductive aspects of thermal physics." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289427.

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This thesis examines various reductive case studies in thermal physics. In particular, I argue that according to my account of reduction-as-construction, there are two suc- cessful examples of reduction. Thermodynamics reduces to statistical mechanics, and statistical mechanics reduces to the underlying microdynamics - be they quantum or classical. The reduction of a given theory alters that theory's scope, that is: its domain of applicability. The scope of thermodynamics will be central to this thesis - and I will argue for a narrower scope than some authors. This thesis consists of four Chap

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Morita, Kohei. "Model Relative Emergence in Physics." Kyoto University, 2020. http://hdl.handle.net/2433/253017.

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18

Franco, Luís Fernando Mercier. "Study on the thermodynamics of bovine serum albumin aqueous solutions: experiments, modeling and molecular simulations." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-14072016-140814/.

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The interaction between two proteins into salt aqueous solutions is investigated throughout this thesis. Experiments, modeling and molecular simulations were carried out to get a better understanding of the phenomenon. Bovine serum albumin was used as a model protein. An analytical expression for the structure factor for globular proteins in aqueous solution is presented in this work. This expression was obtained considering an intermolecular potential given by the sum of a hard core, a van der Waals attractive and a screened Coulomb contribution. Experimental data of Small Angle X-Ray Scatter

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19

Delhorme, Maxime. "Thermodynamics and Structure of Plate-Like Particle Dispersions." Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00818964.

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A considerable amount of mineral particles are found to have a plate-like shape. The work in this thesis concerns theoretical investigations, using a Monte Carlo method, of the properties of such particles in aqueous solutions. The objectives were first to create a model that could capture the essential physics of clay suspensions and also to understand the role of thermodynamics in certain chemical processes. For all investigations, the results are related to experimental studies. The acid-base behavior of clays have been studied, using the primitive model, and an excellent agreement between

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20

Rizzatti, Eduardo Osório. "Coexistência de fases, criticalidade e solubilidade em mistura binárias." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/152708.

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Fundando-se em argumentos de equilíbrio e estabilidade termodinâmica, a solubilidade de soluto em um solvente é definida pelo limiar de existência da mistura como sistema homogêneo. De fato, entende-se tal grandeza sobre a coexistência de fases. A noção de solubilidade apresentada é desenvolvida através de modelos simples, que incluem resultados na rede bem como a extensão do modelo de van der Waals ao caso de duas componentes. Desta extrai-se uma condição genérica à observação de mínimos na solubilidade incidente sobre a topologia de seu diagrama de fases e de evidente correspondência física.

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21

Santos, Gabriel Marinello de Souza. "Matrizes aleatórias no ensemble." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-06112014-154150/.

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O estudo de matrizes aleatórias na física tradicionalmente ocorre no contexto dos modelos de Wigner e na estatística por modelos de Wishart, que se conectam através do threefold way de Dyson para matrizes aleatórias reais, complexas e de quaternios indexadas respectivamente pelo índice B = 1; 2; 4 de Dyson. Estudos recentes mostraram o caminho para que estes modelos fossem generalizados para valores reais de B, permitindo o estudo de ensembles com índice arbitrário. Neste trabalho, estudamos as propriedades estatísticas destes sistemas e exploramos a física subjacente nos modelos de Wigner e W

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22

Silva, Geovani Rita da. "Termodinâmica através do Cubo de Rubik." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/6323.

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Carmo, Eduardo do. "Modelos estatísticos para o ordenamento nemático biaxial." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-15052012-091811/.

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Consideramos o modelo de Maier-Saupe com a discretização de Zwanzig para as possíveis orientações das moléculas de cristais líquidos nemáticos. Esse modelo reproduz a transição de fases nemático-isotrópica dos cristais líquidos termotrópicos em acordo com a teoria fenomenológica de Maier e Saupe. Introduzimos variáveis desordenadas de forma a fim de descrever uma eventual estrutura biaxial em uma mistura binária de moléculas uniaxiais oblatas e prolatas. Para uma desordem do tipo quenched, o diagrama de fases do modelo possui uma fase nemática biaxial estável. Para uma desordem do tipo anneale

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24

Capela, Matheus. "Kolmogorov-Sinai entropy and dissipation in driven classical hamiltonian systems." Universidade Federal de Goiás, 2018. http://repositorio.bc.ufg.br/tede/handle/tede/8216.

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Haddad, Thomás Augusto Santoro. "Exemplos de universalidade na física estatística de modelos aperiódicos e desordenados." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26022014-094330/.

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Apresentamos neste trabalho uma série de estudos sobre os efeitos de perturbações geométricas em alguns modelos da física estatística com transições de fase contínuas, Essas perturbações são causadas por distribuições aleatórias ou aperiódicas (e determinísticas) de campos ou de acoplamentos microscópicos ao longo das redes em que os modelos são definidos. No caso de sistemas aperiódicos sem desordem, mostramos uma grande quantidade de exemplos das possíveis alterações induzidas no comportamento crítico de modelos de Ising, Potts e um modelo para polímeros em interação. Empregamos técnicas não

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Jones, Nicholaos John. "Ineliminable idealizations, phase transitions, and irreversibility." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1163026373.

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Nascimento, Denise Andrade do. "Comportamento termodinâmico de cadeias de dímeros." Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/8656.

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Letizia, Viviana. "Modèles microscopiques pour la loi de Fourier." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLED038/document.

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Cette thèse est consacrée à l’étude des modèles microscopiques pour la dérivation de la conduction de la chaleur. Démontrer rigoureusement une équation diffusive macroscopique à partir d’une description microscopique du système est à aujourd’hui encore un problème ouvert. On étudie un système décrit par l’équation de Schrödinger linéaire discrète (DLS) en dim 1, perturbé par une dynamique stochastique conservative. On peut montrer que le système a une limite hydrodynamique donnée par la solution de l’équation de la chaleur. Quand le système est rattaché aux bords à deux réservoirs de Langevin

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29

Brum, Rafael Mynssen. "Propriedades termodinâmicas de um polímero fixado na superfície de uma rede de Bethe semi-infinita." Niterói, 2017. https://app.uff.br/riuff/handle/1/3782.

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Submitted by Biblioteca do Instituto de Física (bif@ndc.uff.br) on 2017-06-05T18:45:59Z No. of bitstreams: 1 Dissertação de mestrado - Rafael Mynssem Brum.pdf: 1829207 bytes, checksum: 8b52407e238edb901004b2e8de1dbdaf (MD5)<br>Made available in DSpace on 2017-06-05T18:45:59Z (GMT). No. of bitstreams: 1 Dissertação de mestrado - Rafael Mynssem Brum.pdf: 1829207 bytes, checksum: 8b52407e238edb901004b2e8de1dbdaf (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>O presente trabalho tem por finalidade descrever as propriedades termodinâmicas de um polímero em uma rede de B

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Schuler, Thomas. "Influence des amas lacunes-solutés sur le vieillissement des solutions solides de Fer-α". Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112170/document.

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La compréhension et la maîtrise des mécanismes qui pilotent le vieillissement des aciers en présence d’une sursaturation de lacunes est un défi dans de nombreux domaines industriels, et particulièrement dans le cas des réacteurs nucléaires. Ces aciers contiennent invariablement des solutés interstitiels en tant qu’éléments d’alliage ou impuretés, et des lacunes (V) qui sont des défauts structuraux d’équilibre. Nous avons choisi le système Fe-V –X (X = C, N ou O) comme matériau modèle d’un acier ferritique. Au sein de ce système, des amas lacunes-solutés interstitiels sont susceptibles de se fo

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Turchi, Alessio. "Dynamics and statistics of systems with long range interactions : application to 1-dimensional toy-models." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4810/document.

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L'objectif de ce thèse est l'étude des systèmes dynamiques avec interaction à longue portée. La complexité de leur dynamique met en évidence des propriétés contre-intuitives et inattendues, comme l'existence d'états stationnaires hors-équilibre (QSS). Dans le QSS on peut observer des propriétés particulières: chaleur spécifique négative, inéquivalence des ensembles statistiques et phénomènes d'auto-organisation. Les théories des interactions LR ont été appliquées pour décrire la dynamique des systèmes auto-gravitants, de tourbillons bidimensionnels, de systèmes avec interactions onde-particule

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Bylin, Johan. "Best practice of extracting magnetocaloric properties in magnetic simulations." Thesis, Uppsala universitet, Materialteori, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-388356.

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In this thesis, a numerical study of simulating and computing the magnetocaloric properties of magnetic materials is presented. The main objective was to deduce the optimal procedure to obtain the isothermal change in entropy of magnetic systems, by evaluating two different formulas of entropy extraction, one relying on the magnetization of the material and the other on the magnet's heat capacity. The magnetic systems were simulated using two different Monte Carlo algorithms, the Metropolis and Wang-Landau procedures. The two entropy methods proved to be comparably similar to one another. Both

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Huang, Liangzhao. "Multiscale modeling of the radiation-induced segregation in Ni-based and Fe-based dilute alloys." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASP048.

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Nous présentons une modélisation quantitative de la redistribution des défauts ponctuels (DPs) et de la ségrégation induite par irradiation (SII) sur les défauts étendus, dans des alliages modèles dilués Ni(B ≡ Ti, Cr) et Fe(B ≡ P, Mn, Cr, Si, Ni, Cu). Le changement de composition chimique au voisinage des défauts étendus joue un rôle décisif sur l’évolution de la microstructure et les propriétés mécaniques d’un matériau. L’irradiation génère des défauts ponctuels, qui diffusent en s’échangeant avec les atomes voisins, s’annihilent en se recombinant entre eux ou en interagissant avec des défau

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Vieira, Tiago de Medeiros. "Conceitos e t?cnicas da mec?nica estat?stica e termodin?mica aplicados ao estudo dos grafos aleat?rios." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/16621.

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Made available in DSpace on 2014-12-17T15:14:59Z (GMT). No. of bitstreams: 1 TiagoMV_DISSERT.pdf: 2054032 bytes, checksum: 01cc6c903e54670f8c4b846fab645cd0 (MD5) Previous issue date: 2012-02-24<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>This dissertation briefly presents the random graphs and the main quantities calculated from them. At the same time, basic thermodynamics quantities such as energy and temperature are associated with some of their characteristics. Approaches commonly used in Statistical Mechanics are employed and rules that describe a time evolution

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Llano, Jorge. "Modern Computational Physical Chemistry : An Introduction to Biomolecular Radiation Damage and Phototoxicity." Doctoral thesis, Uppsala University, Department of Cell and Molecular Biology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4224.

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<p>The realm of molecular physical chemistry ranges from the structure of matter and the fundamental atomic and molecular interactions to the macroscopic properties and processes arising from the average microscopic behaviour.</p><p>Herein, the conventional electrodic problem is recast into the simpler molecular problem of finding the electrochemical, real chemical, and chemical potentials of the species involved in redox half-reactions. This molecular approach is followed to define the three types of absolute chemical potentials of species in solution and to estimate their standard values. Th

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Khan, Abdul Kareem. "Electrostaticanalisys the Ras active site." Doctoral thesis, Universitat Pompeu Fabra, 2009. http://hdl.handle.net/10803/7161.

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La preorganització electrostàtica del centre actiu s'ha postulat com el mecanisme genèric de l'acció dels enzims. Així, alguns residus "estratègics" es disposarien per catalitzar reaccions interaccionant en una forma més forta amb l'estat de transició, baixant d'aquesta manera el valor de l'energia dactivació g cat. S'ha proposat que aquesta preorientació electrostática s'hauria de poder mostrar analitzant l'estabilitat electrostàtica de residus individuals en el centre actiu.<br/>Ras es una proteïna essencial de senyalització i actúa com un interruptor cel.lular. Les característiques

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"A variational effective potential approximation for the Feynman path integral approach to statistical mechanics." Chinese University of Hong Kong, 1992. http://library.cuhk.edu.hk/record=b5895750.

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by Lee Siu-keung.<br>Parallel title in Chinese.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 1992.<br>Includes bibliographical references (leaves 162-164).<br>Chapter Chapter 1 --- Introduction --- p.5<br>Chapter Chapter 2 --- Path Integrals<br>Chapter 2.1 --- Path´ؤIntegral Approach to Quantum Mechanics --- p.8<br>Chapter 2.2 --- Path´ؤIntegral Approach to Statistical Mechanics --- p.14<br>Chapter 2.3 --- Variational Principle --- p.18<br>Chapter 2.4 --- "Variational Method Proposed by Giachetti and Tognetti, and by Feynman and Kleinert"<br>Chapter 2.4.1 --- Effective Classical P

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Begay, Shanadeen Crystal. "Thermodynamics and structure of methionine enkephalin using the statistical temperature molecular dynamics algorithm." Thesis, 2015. https://hdl.handle.net/2144/15704.

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Kim, Straub, and Keyes introduced the statistical temperature molecular dynamics (STMD) algorithm to overcome broken ergodicity by sampling a non-Boltzmann flat energy histogram as noted in Kim, Straub, and Keyes, Phys. Rev. Lett. 97: 050601 (2007). Canonical averages are calculated via reweighting to the desired temperature. While STMD is promising, its application has been almost entirely to simple or model systems. In this dissertation the implementation of STMD into the biosimulation package CHARMM is used to simulate the methionine enkephalin pentamer peptide with a methione terminal cap

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Zangara, Pablo René. "El eco de Loschmidt en sistemas de espines: decoherencia, equilibración, localización y mecanismos emergentes de irreversibilidad." Doctoral thesis, 2015. http://hdl.handle.net/11086/2765.

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Tesis (Doctor en Física)--Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, 2016.<br>Los fenómenos irreversibles son omnipresentes en la naturaleza. En el mundo microscópico, por ejemplo, un exceso de polarización magnética difunde en un sistema de espines interactuantes hasta desparramarse completamente. En esta Tesis estudiamos la dinámica de tal proceso para sistemas abiertos y cerrados. El primer caso corresponde al fenómeno de decoherencia inducida por un ambiente externo, mientras que el segundo engloba dos fenómenos opuestos que pueden ocurrir en

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Steinigeweg, Robin. "Application of Projection Operator Techniques to Transport Investigations in Closed Quantum Systems." Doctoral thesis, 2008. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2008082910.

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The work at hand presents a novel approach to transport in closed quantum systems. To this end a method is introduced which is essentially based on projection operator techniques, in particular on the time-convolutionless (TCL) technique. The projection onto local densities of quantities such as energy, magnetization, particles, etc. yields the reduced dynamics of the respective quantities in terms of a systematic perturbation expansion. Especially, the lowest order contribution of this expansion is used as a strategy for the analysis of transport in "modular" quantum systems. The term modular

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