• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 513
  • 154
  • 93
  • 61
  • 53
  • 31
  • 14
  • 13
  • 11
  • 6
  • 5
  • 4
  • 4
  • 2
  • 2
  • Tagged with
  • 1127
  • 283
  • 282
  • 133
  • 117
  • 100
  • 90
  • 87
  • 84
  • 83
  • 68
  • 61
  • 61
  • 52
  • 52
  • 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.
81

Single impurities in a Bose-Einstein condensate

Palzer, Stefan January 2010 (has links)
No description available.
82

Persistent currents in Bose-Einstein condensates

Moulder, Stuart January 2013 (has links)
No description available.
83

The Effects of Marangoni Convection on the Rate of Condensation of Pure Water

Fernando, Nilendri L. 04 December 2012 (has links)
A series of steady-state water condensation experiments were conducted to determine the effects of Marangoni convection on the condensation flux. The interface was flat so that the results of the interfacial temperature discontinuities could be compared to past condensation experiments conducted under similar experimental conditions using a spherical interface. Two experimental methods were used. Method 1 was to vary the temperature in the cooling pipes (Tcp ) with the position of the interface relative to the cooling pipes fixed. Method 2 was to vary the position of the interface while Tcp was held constant. The interfacial temperature discontinuities in this study were approximately 2.3-9 times smaller in magnitude, than those measured using a spherical liquid-vapour interface. The experimental results showed that the condensation flux increased as thermocapillary convection increased (increase in interfacial temperature gradients and speed). This increase resulted in a 1.37-12.5 times enhancement in the condensation flux of pure water.
84

The Effects of Marangoni Convection on the Rate of Condensation of Pure Water

Fernando, Nilendri L. 04 December 2012 (has links)
A series of steady-state water condensation experiments were conducted to determine the effects of Marangoni convection on the condensation flux. The interface was flat so that the results of the interfacial temperature discontinuities could be compared to past condensation experiments conducted under similar experimental conditions using a spherical interface. Two experimental methods were used. Method 1 was to vary the temperature in the cooling pipes (Tcp ) with the position of the interface relative to the cooling pipes fixed. Method 2 was to vary the position of the interface while Tcp was held constant. The interfacial temperature discontinuities in this study were approximately 2.3-9 times smaller in magnitude, than those measured using a spherical liquid-vapour interface. The experimental results showed that the condensation flux increased as thermocapillary convection increased (increase in interfacial temperature gradients and speed). This increase resulted in a 1.37-12.5 times enhancement in the condensation flux of pure water.
85

Properties of trapped dipolar condensates

Yi, Su 05 1900 (has links)
No description available.
86

Entanglement and spin squeezing of bose condensed atoms

Zhang, Mei 05 1900 (has links)
No description available.
87

Realization of Bose-Einstein Condensation of 87Rb in a Time-orbiting Potential Trap

Siercke, Mirco 13 June 2011 (has links)
The construction of an apparatus capable of producing Bose-Einstein condensates marks a significant milestone in every experimental cold atom laboratory. In this thesis I describe the development of a system to create a Bose-Einstein condensate of $^{87}Rb$ in a Time-Orbiting Potential trap. I review the optical and magnetic techniques required to trap and cool an atomic sample under vacuum, motivating our decision to build a double MOT system comprised of a high-pressure ($10^{-9}$ torr) chamber to gather atoms and a low-pressure ($10^{-11}$ torr) chamber to cool atoms to degeneracy. By theoretically modeling the atom number and temperature inside the magnetic trap during evaporative cooling I demonstrate a simple approach to determining a cooling path that reaches the transition temperature. By making use of the condensates produced under these non-optimized conditions I determine the heating rate of the condensate in the TOP trap to be $300$ nK/s. I further use the condensates to make a more precise measurement of the TOP trap bias field. I improve upon the conventional evaporation path used in TOP trap experiments by introducing and optimizing additional bias field compression stages in between RF evaporation ramps. I demonstrate how, by adding these additional stages, the system is capable of reaching the BEC phase transition with a final atom number of $2\times 10^{5}$. In contrast, RF evaporation after only a single bias field ramp has yielded condensates with only $30\times 10^3$ atoms.
88

Realization of Bose-Einstein Condensation of 87Rb in a Time-orbiting Potential Trap

Siercke, Mirco 13 June 2011 (has links)
The construction of an apparatus capable of producing Bose-Einstein condensates marks a significant milestone in every experimental cold atom laboratory. In this thesis I describe the development of a system to create a Bose-Einstein condensate of $^{87}Rb$ in a Time-Orbiting Potential trap. I review the optical and magnetic techniques required to trap and cool an atomic sample under vacuum, motivating our decision to build a double MOT system comprised of a high-pressure ($10^{-9}$ torr) chamber to gather atoms and a low-pressure ($10^{-11}$ torr) chamber to cool atoms to degeneracy. By theoretically modeling the atom number and temperature inside the magnetic trap during evaporative cooling I demonstrate a simple approach to determining a cooling path that reaches the transition temperature. By making use of the condensates produced under these non-optimized conditions I determine the heating rate of the condensate in the TOP trap to be $300$ nK/s. I further use the condensates to make a more precise measurement of the TOP trap bias field. I improve upon the conventional evaporation path used in TOP trap experiments by introducing and optimizing additional bias field compression stages in between RF evaporation ramps. I demonstrate how, by adding these additional stages, the system is capable of reaching the BEC phase transition with a final atom number of $2\times 10^{5}$. In contrast, RF evaporation after only a single bias field ramp has yielded condensates with only $30\times 10^3$ atoms.
89

The absorption of sulfur dioxide by condensing aerosols

Travis, Edward Outlaw 08 1900 (has links)
No description available.
90

Multicomponent diffusion during water condensation

Woo, Yi-Ren 12 1900 (has links)
No description available.

Page generated in 0.1251 seconds