2,569 research outputs found
Rogue decoherence in the formation of a macroscopic atom-molecule superposition
We theoretically examine two-color photoassociation of a Bose-Einstein
condensate, focusing on the role of rogue decoherence in the formation of
macroscopic atom-molecule superpositions. Rogue dissociation occurs when two
zero-momentum condensate atoms are photoassociated into a molecule, which then
dissociates into a pair of atoms of equal-and-opposite momentum, instead of
dissociating back to the zero-momentum condensate. As a source of decoherence
that may damp quantum correlations in the condensates, rogue dissociation is an
obstacle to the formation of a macroscopic atom-molecule superposition. We
study rogue decoherence in a setup which, without decoherence, yields a
macroscopic atom-molecule superposition, and find that the most favorable
conditions for said superposition are a density ~ 1e12 atoms per cc and
temperature ~ 1e-10.Comment: 10 pages, 4 figures, 46+ references; submitted to PR
Bisphosphonates regulate cell growth and gene expression in the UMR 106-01 clonal rat osteosarcoma cell line
Local growth of osteosarcoma involves destruction of host bone by proteolytic mechanisms and/or host osteoclast activation. Osteoclast formation and activity are regulated by osteoblast-derived factors such as the osteoclast differentiating factor, receptor activator of NF-κB ligand (RANKL) and the inhibitor osteoprotegerin (OPG). We have investigated the in vitro effects of bisphosphonates on a clonal rat osteosarcoma cell line. The aminobisphosphonate pamidronate was added to UMR 106-01 cell cultures (10−8M to 10−4M up to 5 days). The non-aminobisphosphonate clodronate was administered for the same time periods (10−6M to 10−2M). Cell proliferation, apoptosis and mRNA expression was assessed. Both agents inhibited cell proliferation in a time- and dose-dependent manner. ELISA analysis demonstrated an increase in DNA fragmentation although there was no significant dose-related difference between the doses studied. Bisphosphonate-treated cultures had a greater subpopulation of cells exhibiting morphological changes of apoptosis. Expression of mRNA for osteopontin and RANKL was down-regulated by both agents, while the expression of mRNA for alkaline phosphatase, pro-α1(I) collagen and OPG was not altered. Out in vitro work suggests the bisphosphonates not only have direct effects on osteosarcoma cell growth and apoptosis, but also, by altering the relative expression of osteoclast-regulating factors, they may inhibit the activity of osteoclasts and their recruitment. © 2001 Cancer Research Campaignhttp://www.bjcancer.co
Superposition of macroscopic numbers of atoms and molecules
We theoretically examine photoassociation of a non-ideal Bose-Einstein
condensate, focusing on evidence for a macroscopic superposition of atoms and
molecules. This problem raises an interest because, rather than two states of a
given object, an atom-molecule system is a seemingly impossible macroscopic
superposition of different objects. Nevertheless, photoassociation enables
coherent intraparticle conversion, and we thereby propose a viable scheme for
creating a superposition of a macroscopic number of atoms with a macroscopic
number of molecules.Comment: 4 pages, 2 figs, to appear in Phys. Rev. Let
No More Missing Inventory: Blockchain and RFID Technology Applications within the Retail Inventory Management System
Over the last two years blockchain technology has presented itself as a potential digital transformation that could disrupt and revitalize many business models. However, this digital transformation is still new and many companies grapple with possible applications of its theoretically sound benefits. Academic research is scarce and often limited to high level perspectives on how blockchain can benefit businesses in general. The time is right for exploring specific applications of the technology. This research considers how the digital transformation to blockchain could impact inventory management practices within the retail industry. The research relies on data collected through phenomenological interviews with management personnel of three clothing retail store franchisees
Clustering of Fermi particles with arbitrary spin
A single l-shell model is investigated for a system of fermions of spin s and
an attractive s-wave, spin channel independent, interaction. The spectra and
eigenvectors are determined exactly for different l, s values and particle
numbers N. As a generalization of Cooper pairing it is shown that when
N=mu(2s+1), mu=1,2,...,2l+1, the ground state consists of clusters of (2s+1)
particles. The relevance of the results for more general situations including
the homogeneous system is briefly discussed.Comment: Submitted for publication, 4 pages, 1 figur
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