Query processing in distributed heterogeneous databases

"December 1981"Bibliography: leaf [1]"Contract ONR/N00014-77-C-0532"Kuan-Tsae Huang, Wilbur B. Davenport, Jr

Comment on "Novel Convective Instabilities in a Magnetic Fluid"

Comment on the paper "Novel Convective Instabilities in a Magnetic Fluid" by W. Luo, T. Du, and J. Huang, Phys. Rev. Lett., v.82, p.4134 (1999).Comment: 1 page, 1 figure, To appear in Phys. Rev. Lett. (2001

Optimization and resilience of complex supply-demand networks

Acknowledgments This work was supported by NSF under Grant No. 1441352. SPZ and ZGH were supported by NSF of China under Grants No. 11135001 and No. 11275003. ZGH thanks Prof Liang Huang and Xin-Jian Xu for helpful discussions.Peer reviewedPublisher PD

Erratum: in Huang, P.C., NN #1, p. 14 Information on Neurospora

Erratum: in Huang, P.C., NN #1, p. 14 Information on Neurospor

Fate of a Bose-Einstein condensate with attractive interaction

We calculate the decay amplitude of a harmonically trapped Bose-Einstein condensate with attractive interaction via the Feynman path integral. We find that when the number of particles is less than a critical number, the condensate decays relatively slowly through quantum tunneling. When the number exceeds the critical one, a "black hole" opens up at the center of the trap, in which density fluctuations become large due to a negative pressure, and collisional loss will drain the particles from the trap. As the black hole is fed by tunneling particles, we have a novel system in which quantum tunneling serves as a hydrodynamic source.Comment: 3 pages, REVTeX; email to [email protected] (Kerson Huang

PHONON COUPLING AND PHOTOIONIZATION CROSS-SECTIONS IN SEMICONDUCTORS

The coupling to lattice vibrations affects the photoionisation spectra of defects in semiconductors. This is especially important for deep defects. The effects are characterised mainly by a Huang-Rhys factor S0 and by a spectral moment. These are calculated for a variety of electron-photon coupling mechanisms as a function of the observable ionisation energy EI rather than the unobservable effective radius used by previous workers. For Frohlich coupling a good approximation for the Huang-Rhys factor is S0(x)/S0(0)=X/ square root ((5+x)/6) with x=EI/(effective Ryd for purely hydrogenic centre)