• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 109
  • 59
  • 24
  • 14
  • 11
  • 10
  • 8
  • 5
  • 4
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 265
  • 132
  • 51
  • 50
  • 38
  • 36
  • 35
  • 29
  • 29
  • 26
  • 25
  • 25
  • 25
  • 24
  • 23
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
141

Füllungs- und wechselwirkungsabhängiger Mott-Übergang : Quanten-Cluster-Rechnungen im Rahmen der Selbstenergiefunktional-Theorie

Balzer, Matthias January 2008 (has links)
Würzburg, Univ., Diss., 2009. / Zsfassung in engl. Sprache.
142

Investigation of order parameters and critical coupling for the Peierls Extended Hubbard Model at one-quarter filling

Hardikar, Rahul Padmakar, January 2004 (has links)
Thesis (M.S.) -- Mississippi State University. Department of Physics and Astronomy. / Title from title screen. Includes bibliographical references.
143

Nonequilibrium effects in strongly correlated systems

Schmidt, Petra. Unknown Date (has links) (PDF)
University, Diss., 2004--Bonn.
144

Delocalized and correlated wave functions for excited states in extended systems

Stoyanova, Alexandrina. January 2006 (has links)
Proefschrift Rijksuniversiteit Groningen. / Met lit.opg. - Met samenvatting in het Nederlands.
145

Hodnocení užitkových vlastností potomstva brojlerových slepic

MASÁROVÁ, Anna January 2017 (has links)
The aim of the diploma thesis was to evaluate the performance of commercial broiler chicken genotypes Ross 308, Cobb 500 and Hubbard F15. Parental test consisted of parent rearing up to the age of 22 weeks, the laying period up to the age of 62 weeks and from fattening progeny tests (lasting for 35 days or else 42 days). Hybrid Ross 308 chickens reached the highest live weight at the end of the rearing period. Hubbard F15 chickens had the lowest feed consumption per head and day and also the lowest mortality rate. Hybrid Hubbard F15 showed the highest number of hatched chickens per 1 laying hen (137.2 pcs), the lowest feed consumption per head and day (149.4 g) and the highest fertility of hatching eggs (9,2 %). Hybrid Ross 308 showed the highest weight of hatching eggs and live weight at the end of the laying period (cockerels 5 029 g, pullets 4 310 g). Cobb 500 cockerels (2 397 g) and Hubbard F 15 pullets (2 145 g) showed the highest live weight during the 35 day fattening period. The highest breast weight was at the hybrid Cobb 500 (516.9 g) and the thighs weight was the highest at Hubbard F15 (511.9 g). The highest carcass yield was observed at hybrid Cobb 500 (76.30%). During the extended fattening period of 42 days had the highest live weight cockerels Ross 308 (3 096 g), Cobb 500 and Hubbard F15 pullets (2 688 g and 2 682 g). The highest breast weight was observed at hybrid Ross 308 (697.0 g) and thighs weight at hybrid Hubbard F15 (707.6 g). The highest carcass yield was at hybrid Hubbard F15 (78.0%).
146

Transições de fase quânticas e equações do ansatz de Bethe para o modelo de Bose-Hubbard de dois sítios

Lima, Diefferson Rubeni da Rosa de January 2010 (has links)
Neste trabalho nós investigamos o modelo de Bose-Hubbard de dois sítios atrativo sob o ponto de vista do ansatz de Bethe. Este modelo descreve o tunelamento Josephson entre dois condensados de Bose-Einstein. Nós iniciamos estabelecendo a integrabilidade do modelo através da álgebra de Yang-Baxter. Usando uma análise clássica nós obtemos o diagrama de parâmetros do sistema. Nós estudamos então as transições de fase quânticas do modelo usando os conceitos de gap de energia, emaranhamento e fidelidade. Nós encontramos que o ponto crítico obtido utilizando estes conceitos coincide com o ponto fixo de bifurcação obtido na análise clássica. Além disso, nós mostramos que este ponto crítico também pode ser identificado através de uma mudança no comportamento das soluções das equações do ansatz de Bethe do modelo para o estado fundamental. / In this work we investigate the attractive two-site Bose Hubbard model from a Bethe ansatz perspective. This model describes Josephson tunneling between two Bose-Einstein condensates. We begin by establishing the integrability of the model through the Yang- Baxter algebra. Using a classical analysis we obtain the phase space xed points of the system. Then we study the quantum phase transitions of the model using the concepts of energy gap, entanglement entropy and the delity. We nd that the critical point obtained using these concepts coincides with the bifurcation point obtained in the classical analysis. Moreover, we also show that this critical point can be also identi ed through a di erent behaviour of the ground-state solutions of the Bethe ansatz equations.
147

Transições de fase quânticas e equações do ansatz de Bethe para o modelo de Bose-Hubbard de dois sítios

Lima, Diefferson Rubeni da Rosa de January 2010 (has links)
Neste trabalho nós investigamos o modelo de Bose-Hubbard de dois sítios atrativo sob o ponto de vista do ansatz de Bethe. Este modelo descreve o tunelamento Josephson entre dois condensados de Bose-Einstein. Nós iniciamos estabelecendo a integrabilidade do modelo através da álgebra de Yang-Baxter. Usando uma análise clássica nós obtemos o diagrama de parâmetros do sistema. Nós estudamos então as transições de fase quânticas do modelo usando os conceitos de gap de energia, emaranhamento e fidelidade. Nós encontramos que o ponto crítico obtido utilizando estes conceitos coincide com o ponto fixo de bifurcação obtido na análise clássica. Além disso, nós mostramos que este ponto crítico também pode ser identificado através de uma mudança no comportamento das soluções das equações do ansatz de Bethe do modelo para o estado fundamental. / In this work we investigate the attractive two-site Bose Hubbard model from a Bethe ansatz perspective. This model describes Josephson tunneling between two Bose-Einstein condensates. We begin by establishing the integrability of the model through the Yang- Baxter algebra. Using a classical analysis we obtain the phase space xed points of the system. Then we study the quantum phase transitions of the model using the concepts of energy gap, entanglement entropy and the delity. We nd that the critical point obtained using these concepts coincides with the bifurcation point obtained in the classical analysis. Moreover, we also show that this critical point can be also identi ed through a di erent behaviour of the ground-state solutions of the Bethe ansatz equations.
148

Fungování center Basic a LITE v České republice / The Functioning of the centers Basic and LITE in the Czech Republic

ŘÁDOVÁ, Lucie January 2011 (has links)
This thesis deals with analysis of the functioning of the tutorial centres Basic and language schools LITE. In the theory part there are alternative streams in education stated which are connected with these centres and Applied Scholastics is introduced which Basic and LITE are its part. It is also stated the standing of Applied Scholastics in the world. In the practical part is described study technology used in the centres Basic and LITE in general and then I looked more closely into the classes of Basic and LITE and described my observation. The research describes the functioning of these institutions in the Czech Republic. I also describe other activities of the centers and I think of positives and negatives of these classes.
149

Thermalization in one-dimensional quantum-many-body systems

Biebl, Fabian Ralf Anton 14 December 2016 (has links)
No description available.
150

Transições de fase quânticas e equações do ansatz de Bethe para o modelo de Bose-Hubbard de dois sítios

Lima, Diefferson Rubeni da Rosa de January 2010 (has links)
Neste trabalho nós investigamos o modelo de Bose-Hubbard de dois sítios atrativo sob o ponto de vista do ansatz de Bethe. Este modelo descreve o tunelamento Josephson entre dois condensados de Bose-Einstein. Nós iniciamos estabelecendo a integrabilidade do modelo através da álgebra de Yang-Baxter. Usando uma análise clássica nós obtemos o diagrama de parâmetros do sistema. Nós estudamos então as transições de fase quânticas do modelo usando os conceitos de gap de energia, emaranhamento e fidelidade. Nós encontramos que o ponto crítico obtido utilizando estes conceitos coincide com o ponto fixo de bifurcação obtido na análise clássica. Além disso, nós mostramos que este ponto crítico também pode ser identificado através de uma mudança no comportamento das soluções das equações do ansatz de Bethe do modelo para o estado fundamental. / In this work we investigate the attractive two-site Bose Hubbard model from a Bethe ansatz perspective. This model describes Josephson tunneling between two Bose-Einstein condensates. We begin by establishing the integrability of the model through the Yang- Baxter algebra. Using a classical analysis we obtain the phase space xed points of the system. Then we study the quantum phase transitions of the model using the concepts of energy gap, entanglement entropy and the delity. We nd that the critical point obtained using these concepts coincides with the bifurcation point obtained in the classical analysis. Moreover, we also show that this critical point can be also identi ed through a di erent behaviour of the ground-state solutions of the Bethe ansatz equations.

Page generated in 0.0222 seconds