We prove the finite-time collapse of a system of N classical fields, which are described by N coupled nonlinear Schrodinger equations. We derive the conditions under which all of the fields...
Force on a moving point impurity due to quantum fluctuations in a Bose-Einstein condensate (2006)
An analytic expression is derived for a force on a weak point impurity arising from the scattering of quantum fluctuations in a slow-moving, weakly interacting, three-dimensional Bose-Einstein...
We propose a method to probe Landau and Beliaev processes in dilute trapped atomic condensates with a multiple state structure using ultraslow light experimental configurations. Under certain...
Casimir Friction II: Casimir effect and drag in zero temperature superfluids (2005)
We discuss a force arising from zero-temperature quantum fluctuations in a weakly interacting Bose-Einstein condensate (BEC). We argue that there is a drag force on an object moving at speeds well...
We calculate a force due to zero-temperature quantum fluctuations on a stationary object in a moving superfluid flow. We model the object by a localized potential varying only in the flow direction...
Fabrication of a microvalve with piezoelectric actuation (2004)
Li, H.Q., Roberts, D.C., Steyn, J.L., Turner, K.T., Yaglioglu, O., Hagood, N.W., ...
The fabrication of an active MEMS microvalve driven by integrated bulk single crystal piezoelectric actuators is reported. The valve has a nine-layer structure composed of glass, silicon, and silicon...
Roberts, D.C., Li, H., Steyn, J.L., Yaglioglu, O., Spearing, S.M., Schmidt, M.A., ...
A piezoelectrically driven hydraulic amplification microvalve for use in compact high-performance hydraulic pumping systems was designed, fabricated, and experimentally characterized. High-frequency,...
Probing States in the Mott Insulator Regime (2002)
We propose a method to probe states in the Mott insulator regime produced from a condensate in an optical lattice. We consider a system in which we create time-dependent number fluctuations in a...
Limitations of light delay and storage times in EIT experiments with condensates (2002)
Roberts, D. C., Gasenzer, T., Burnett, K.
We investigate the limitations arising from atomic collisions on the storage and delay times of probe pulses in EIT experiments. We find that the atomic collisions can be described by an effective...
Roberts, D. C., Gasenzer, T., Burnett, K.
We investigate the relative particle number squeezing produced in the excited states of a weakly interacting condensate at zero temperature by stimulated light scattering using a pair of lasers. We...
Entanglement between photons and atoms coupled out from a Bose-Einstein-Condensate (2001)
Gasenzer, T., Roberts, D. C., Burnett, K.
We study the limitations to the relative number squeezing between photons and atoms coupled out from a homogeneous Bose-Einstein-Condensate. We consider the coupling between the translational atomic...
Su, Y.H., Chen, K.S., Roberts, D.C., Spearing, S.M.
The large deflection analysis of a pre-stressed annular plate with a central rigid boss subjected to axisymmetric loading is presented. The factors affecting the transition from plate behaviour to...
A Solution to the Graceful Exit Problem in Pre-Big Bang Cosmology (1999)
Ellis, G. F. R., Roberts, D. C., Solomons, D., Dunsby, P. K. S.
We examine the string cosmology equations with a dilaton potential in the context of the Pre-Big Bang Scenario with the desired scale factor duality, and give a generic algorithm for obtaining...
Entry into the large commercial aero engine industry by East Asian companies. (1998)
Roberts, D.C, Cranfield Univ. (GB).
Thesis (Ph.D.)
Roberts, D C, Miller, N E, Price, S G, Crook, D, Cortese, C, La Ville, A, ...
A simple method has been developed for labelling human plasma lipoproteins to high specific radioactivity with radioactive cholesteryl esters in vitro. After isolation by preparative...
Roberts, D C, Miller, N E, Price, S G, Crook, D, Cortese, C, La Ville, A, ...
A simple method has been developed for labelling human plasma lipoproteins to high specific radioactivity with radioactive cholesteryl esters in vitro. After isolation by preparative...
Cytotoxic agents: IV, the carcinogenic actions of some monofunctional ethyleneimine derivatives
Walpole, A. L., Roberts, D. C., Rose, F. L., Hendry, J. A., Homer, R. F.