Univ. Gesamthochsch., Diss., 1994--Kassel

Une décennie après la découverte du graphème par A.K. Geim et K.S. Novoselov ,beaucoup de ses propriétés fondamentales ont été intensément étudiées. En effet, lespromesses du graphème a été etenues et ont conduit a une recherche fructueuse dansdes domaines aussi varies que l'optique, la mécanique, la chimie ou l'électronique. Legraphème mérite ainsi d'être appelée le matériau miracle puisque c'est un très conducteurde la chaleur et de l'électricité, il est l'un des matériau les plus solides tout en étantléger et optiquement transparent. Son succès est en partie dû à la technique de micro clivage,ou exfoliation qui est facile et accessible à tout laboratoire sans équipementlourd. Cela a permis d'étudier les propriétés du graphème avec un large éventail de techniquesexpérimentales. Après l'immense succès du graphème, d'autres matériaux bidimensionnels(2D) ont été obtenus avec la même technique, conduisant à une physiqueparticulièrement riche. / A decade after the discovery of grapheme by A.K. Geim and K.S. Novoselov , manyof its fundamental properties have been intensely studied. Indeed, the early promise ofgrapheme has been kept, leading to a fruitful research in many felds as diverse as optics,mechanics, chemistry or electronics, and grapheme still deserves the name of wondermaterial as among its attributes there is an exceptionally good conduction of heat andelectricity, it is one of the strongest known material while being light and opticallytransparent. Its success was partly due to the easy micromechanical cleavage or scotchtape exfoliation technique accessible to any laboratory without heavy equipment, thatallowed to study the properties of grapheme with a wide range of experimental techniques.Following the success of grapheme, other two-dimensional (2D) materials were obtainedwith the same technique, leading to a particularly rich physics.

Thèse doctorat : Mathématiques : Nancy 1 : 2006. / Titre provenant de l'écran-titre.

Regensburg, Univ., Diss., 2008

Thesis--Göttingen. / In Periodical Room.

Universiẗat, Diss., 1991--Bonn.

Thesis (doctoral)--Rheinische Friedrich-Wilhelms-Universität Bonn, 1991. / Includes bibliographical references (p. 67-68).

University, Habil.-Schr., 2000--Leipzig. / Elektronische Ressource verfügbar im PDF- und PS-Format. Text engl.

PACHECO, Mário Henrique Gomes. Propriedades termodinâmicas do oscilador de Dirac e algumas contribuições da função theta de Jacobi. 2007. 65 f. Tese (Doutorado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2007. / Submitted by Edvander Pires (edvanderpires@gmail.com) on 2015-05-22T20:39:15Z No. of bitstreams: 1 2007_tese_mhgpacheco.pdf: 348432 bytes, checksum: a820f6b5450ff322d4336320ad27ec1d (MD5) / Approved for entry into archive by Edvander Pires(edvanderpires@gmail.com) on 2015-05-25T21:18:46Z (GMT) No. of bitstreams: 1 2007_tese_mhgpacheco.pdf: 348432 bytes, checksum: a820f6b5450ff322d4336320ad27ec1d (MD5) / Made available in DSpace on 2015-05-25T21:18:46Z (GMT). No. of bitstreams: 1 2007_tese_mhgpacheco.pdf: 348432 bytes, checksum: a820f6b5450ff322d4336320ad27ec1d (MD5) Previous issue date: 2007 / In this work we analyze the three-dimensional Dirac oscillator in a thermal bath. We found that the heat capacity is two times greather than the heat capacity of the one-dimensional Dirac oscillator in the higher temperatures. We begin with the energy spectrum of the three-dimensional Dirac oscillator, then we find the partition functions and others thermodynamics properties; thus we make one comparasion with the one-dimensional Dirac oscillator and non-relativistic harmonic oscillator. We are interested in study numerically the properties thermodynamics of the square well with infinity potencial. In the latter case we have used a Jacobi theta function. / Nesta tese analisamos o oscilador de Dirac tridimensional em um banho térmico. Encontramos que o calor específico do oscilador de Dirac tridimensional é duas vezes maior que o calor específico do oscilador de Dirac unidimensional quando estamos em um regime de altas temperaturas. Inicialmente utilizamos o espectro de energia do oscilador de Dirac tridimensional para encontramos a função de partição e as demais propriedades. Assim procedendo, fizemos uma comparação com oscilador de Dirac unidimensional e com oscilador harmônico não-relativístico. Em seguida, fizemos um estudo numérico das propriedades termodinâmicas de um poço quadrado de potencial infinito. Para este estudo nós utilizamos a função theta de Jacobi.

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